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![Chuck Lever](/assets/img/avatar_default.png)
The maximum size of a backchannel message on RPC-over-RDMA depends on the connection's inline threshold. Today that threshold is typically 1024 bytes, making the maximum message size 996 bytes. The Linux server's CREATE_SESSION operation checks that the size of callback Calls can be as large as 1044 bytes, to accommodate RPCSEC_GSS. Thus CREATE_SESSION fails if a client advertises the true message size maximum of 996 bytes. But the server's backchannel currently does not support RPCSEC_GSS. The actual maximum size it needs is much smaller. It is safe to reduce the limit to enable NFSv4.1 on RDMA backchannel operation. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
6954 lines
176 KiB
C
6954 lines
176 KiB
C
/*
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* Copyright (c) 2001 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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* Andy Adamson <kandros@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/swap.h>
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#include <linux/pagemap.h>
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#include <linux/ratelimit.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/jhash.h>
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#include "xdr4.h"
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#include "xdr4cb.h"
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#include "vfs.h"
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#include "current_stateid.h"
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#include "netns.h"
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#include "pnfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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#define all_ones {{~0,~0},~0}
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static const stateid_t one_stateid = {
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.si_generation = ~0,
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.si_opaque = all_ones,
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};
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static const stateid_t zero_stateid = {
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/* all fields zero */
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};
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static const stateid_t currentstateid = {
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.si_generation = 1,
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};
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static u64 current_sessionid = 1;
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#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
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#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
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#define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
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/* forward declarations */
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static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
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static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
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/* Locking: */
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/*
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* Currently used for the del_recall_lru and file hash table. In an
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* effort to decrease the scope of the client_mutex, this spinlock may
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* eventually cover more:
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*/
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static DEFINE_SPINLOCK(state_lock);
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/*
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* A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
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* the refcount on the open stateid to drop.
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*/
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static DECLARE_WAIT_QUEUE_HEAD(close_wq);
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static struct kmem_cache *openowner_slab;
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static struct kmem_cache *lockowner_slab;
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static struct kmem_cache *file_slab;
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static struct kmem_cache *stateid_slab;
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static struct kmem_cache *deleg_slab;
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static struct kmem_cache *odstate_slab;
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static void free_session(struct nfsd4_session *);
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static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
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static bool is_session_dead(struct nfsd4_session *ses)
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{
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return ses->se_flags & NFS4_SESSION_DEAD;
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}
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static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
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{
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if (atomic_read(&ses->se_ref) > ref_held_by_me)
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return nfserr_jukebox;
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ses->se_flags |= NFS4_SESSION_DEAD;
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return nfs_ok;
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}
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static bool is_client_expired(struct nfs4_client *clp)
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{
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return clp->cl_time == 0;
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}
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static __be32 get_client_locked(struct nfs4_client *clp)
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{
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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lockdep_assert_held(&nn->client_lock);
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if (is_client_expired(clp))
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return nfserr_expired;
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atomic_inc(&clp->cl_refcount);
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return nfs_ok;
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}
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/* must be called under the client_lock */
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static inline void
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renew_client_locked(struct nfs4_client *clp)
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{
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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if (is_client_expired(clp)) {
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WARN_ON(1);
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printk("%s: client (clientid %08x/%08x) already expired\n",
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__func__,
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clp->cl_clientid.cl_boot,
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clp->cl_clientid.cl_id);
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return;
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}
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dprintk("renewing client (clientid %08x/%08x)\n",
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clp->cl_clientid.cl_boot,
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clp->cl_clientid.cl_id);
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list_move_tail(&clp->cl_lru, &nn->client_lru);
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clp->cl_time = get_seconds();
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}
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static void put_client_renew_locked(struct nfs4_client *clp)
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{
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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lockdep_assert_held(&nn->client_lock);
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if (!atomic_dec_and_test(&clp->cl_refcount))
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return;
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if (!is_client_expired(clp))
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renew_client_locked(clp);
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}
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static void put_client_renew(struct nfs4_client *clp)
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{
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
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return;
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if (!is_client_expired(clp))
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renew_client_locked(clp);
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spin_unlock(&nn->client_lock);
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}
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static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
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{
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__be32 status;
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if (is_session_dead(ses))
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return nfserr_badsession;
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status = get_client_locked(ses->se_client);
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if (status)
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return status;
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atomic_inc(&ses->se_ref);
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return nfs_ok;
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}
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static void nfsd4_put_session_locked(struct nfsd4_session *ses)
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{
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struct nfs4_client *clp = ses->se_client;
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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lockdep_assert_held(&nn->client_lock);
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if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
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free_session(ses);
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put_client_renew_locked(clp);
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}
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static void nfsd4_put_session(struct nfsd4_session *ses)
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{
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struct nfs4_client *clp = ses->se_client;
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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spin_lock(&nn->client_lock);
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nfsd4_put_session_locked(ses);
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spin_unlock(&nn->client_lock);
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}
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static inline struct nfs4_stateowner *
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nfs4_get_stateowner(struct nfs4_stateowner *sop)
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{
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atomic_inc(&sop->so_count);
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return sop;
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}
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static int
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same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
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{
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return (sop->so_owner.len == owner->len) &&
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0 == memcmp(sop->so_owner.data, owner->data, owner->len);
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}
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static struct nfs4_openowner *
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find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
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struct nfs4_client *clp)
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{
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struct nfs4_stateowner *so;
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lockdep_assert_held(&clp->cl_lock);
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list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
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so_strhash) {
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if (!so->so_is_open_owner)
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continue;
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if (same_owner_str(so, &open->op_owner))
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return openowner(nfs4_get_stateowner(so));
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}
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return NULL;
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}
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static struct nfs4_openowner *
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find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
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struct nfs4_client *clp)
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{
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struct nfs4_openowner *oo;
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spin_lock(&clp->cl_lock);
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oo = find_openstateowner_str_locked(hashval, open, clp);
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spin_unlock(&clp->cl_lock);
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return oo;
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}
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static inline u32
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opaque_hashval(const void *ptr, int nbytes)
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{
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unsigned char *cptr = (unsigned char *) ptr;
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u32 x = 0;
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while (nbytes--) {
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x *= 37;
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x += *cptr++;
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}
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return x;
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}
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static void nfsd4_free_file_rcu(struct rcu_head *rcu)
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{
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struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
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kmem_cache_free(file_slab, fp);
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}
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void
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put_nfs4_file(struct nfs4_file *fi)
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{
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might_lock(&state_lock);
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if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
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hlist_del_rcu(&fi->fi_hash);
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spin_unlock(&state_lock);
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WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
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WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
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call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
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}
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}
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static struct file *
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__nfs4_get_fd(struct nfs4_file *f, int oflag)
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{
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if (f->fi_fds[oflag])
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return get_file(f->fi_fds[oflag]);
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return NULL;
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}
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static struct file *
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find_writeable_file_locked(struct nfs4_file *f)
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{
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struct file *ret;
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lockdep_assert_held(&f->fi_lock);
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ret = __nfs4_get_fd(f, O_WRONLY);
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if (!ret)
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ret = __nfs4_get_fd(f, O_RDWR);
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return ret;
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}
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static struct file *
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find_writeable_file(struct nfs4_file *f)
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{
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struct file *ret;
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spin_lock(&f->fi_lock);
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ret = find_writeable_file_locked(f);
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spin_unlock(&f->fi_lock);
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return ret;
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}
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static struct file *find_readable_file_locked(struct nfs4_file *f)
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{
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struct file *ret;
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lockdep_assert_held(&f->fi_lock);
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ret = __nfs4_get_fd(f, O_RDONLY);
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if (!ret)
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ret = __nfs4_get_fd(f, O_RDWR);
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return ret;
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}
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static struct file *
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find_readable_file(struct nfs4_file *f)
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{
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struct file *ret;
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spin_lock(&f->fi_lock);
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ret = find_readable_file_locked(f);
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spin_unlock(&f->fi_lock);
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return ret;
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}
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struct file *
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find_any_file(struct nfs4_file *f)
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{
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struct file *ret;
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spin_lock(&f->fi_lock);
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ret = __nfs4_get_fd(f, O_RDWR);
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if (!ret) {
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ret = __nfs4_get_fd(f, O_WRONLY);
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if (!ret)
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ret = __nfs4_get_fd(f, O_RDONLY);
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}
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spin_unlock(&f->fi_lock);
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return ret;
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}
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static atomic_long_t num_delegations;
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unsigned long max_delegations;
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/*
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* Open owner state (share locks)
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*/
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/* hash tables for lock and open owners */
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#define OWNER_HASH_BITS 8
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#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
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#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
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static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
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{
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unsigned int ret;
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ret = opaque_hashval(ownername->data, ownername->len);
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return ret & OWNER_HASH_MASK;
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}
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/* hash table for nfs4_file */
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#define FILE_HASH_BITS 8
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#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
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static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
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{
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return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
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}
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static unsigned int file_hashval(struct knfsd_fh *fh)
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{
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return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
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}
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static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
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static void
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__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
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{
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lockdep_assert_held(&fp->fi_lock);
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if (access & NFS4_SHARE_ACCESS_WRITE)
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atomic_inc(&fp->fi_access[O_WRONLY]);
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if (access & NFS4_SHARE_ACCESS_READ)
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atomic_inc(&fp->fi_access[O_RDONLY]);
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}
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static __be32
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nfs4_file_get_access(struct nfs4_file *fp, u32 access)
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{
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lockdep_assert_held(&fp->fi_lock);
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/* Does this access mode make sense? */
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if (access & ~NFS4_SHARE_ACCESS_BOTH)
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return nfserr_inval;
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/* Does it conflict with a deny mode already set? */
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if ((access & fp->fi_share_deny) != 0)
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return nfserr_share_denied;
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__nfs4_file_get_access(fp, access);
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return nfs_ok;
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}
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static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
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{
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/* Common case is that there is no deny mode. */
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if (deny) {
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/* Does this deny mode make sense? */
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if (deny & ~NFS4_SHARE_DENY_BOTH)
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return nfserr_inval;
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if ((deny & NFS4_SHARE_DENY_READ) &&
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atomic_read(&fp->fi_access[O_RDONLY]))
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return nfserr_share_denied;
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if ((deny & NFS4_SHARE_DENY_WRITE) &&
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atomic_read(&fp->fi_access[O_WRONLY]))
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return nfserr_share_denied;
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}
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return nfs_ok;
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}
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static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
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{
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might_lock(&fp->fi_lock);
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if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
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struct file *f1 = NULL;
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struct file *f2 = NULL;
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swap(f1, fp->fi_fds[oflag]);
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if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
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swap(f2, fp->fi_fds[O_RDWR]);
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spin_unlock(&fp->fi_lock);
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if (f1)
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fput(f1);
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if (f2)
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fput(f2);
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}
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}
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static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
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{
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WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
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if (access & NFS4_SHARE_ACCESS_WRITE)
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__nfs4_file_put_access(fp, O_WRONLY);
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if (access & NFS4_SHARE_ACCESS_READ)
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__nfs4_file_put_access(fp, O_RDONLY);
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}
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/*
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* Allocate a new open/delegation state counter. This is needed for
|
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* pNFS for proper return on close semantics.
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*
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* Note that we only allocate it for pNFS-enabled exports, otherwise
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* all pointers to struct nfs4_clnt_odstate are always NULL.
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|
*/
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static struct nfs4_clnt_odstate *
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alloc_clnt_odstate(struct nfs4_client *clp)
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{
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struct nfs4_clnt_odstate *co;
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co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
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if (co) {
|
|
co->co_client = clp;
|
|
atomic_set(&co->co_odcount, 1);
|
|
}
|
|
return co;
|
|
}
|
|
|
|
static void
|
|
hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
|
|
{
|
|
struct nfs4_file *fp = co->co_file;
|
|
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
list_add(&co->co_perfile, &fp->fi_clnt_odstate);
|
|
}
|
|
|
|
static inline void
|
|
get_clnt_odstate(struct nfs4_clnt_odstate *co)
|
|
{
|
|
if (co)
|
|
atomic_inc(&co->co_odcount);
|
|
}
|
|
|
|
static void
|
|
put_clnt_odstate(struct nfs4_clnt_odstate *co)
|
|
{
|
|
struct nfs4_file *fp;
|
|
|
|
if (!co)
|
|
return;
|
|
|
|
fp = co->co_file;
|
|
if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
|
|
list_del(&co->co_perfile);
|
|
spin_unlock(&fp->fi_lock);
|
|
|
|
nfsd4_return_all_file_layouts(co->co_client, fp);
|
|
kmem_cache_free(odstate_slab, co);
|
|
}
|
|
}
|
|
|
|
static struct nfs4_clnt_odstate *
|
|
find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
|
|
{
|
|
struct nfs4_clnt_odstate *co;
|
|
struct nfs4_client *cl;
|
|
|
|
if (!new)
|
|
return NULL;
|
|
|
|
cl = new->co_client;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
|
|
if (co->co_client == cl) {
|
|
get_clnt_odstate(co);
|
|
goto out;
|
|
}
|
|
}
|
|
co = new;
|
|
co->co_file = fp;
|
|
hash_clnt_odstate_locked(new);
|
|
out:
|
|
spin_unlock(&fp->fi_lock);
|
|
return co;
|
|
}
|
|
|
|
struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl,
|
|
struct kmem_cache *slab)
|
|
{
|
|
struct nfs4_stid *stid;
|
|
int new_id;
|
|
|
|
stid = kmem_cache_zalloc(slab, GFP_KERNEL);
|
|
if (!stid)
|
|
return NULL;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock(&cl->cl_lock);
|
|
new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
|
|
spin_unlock(&cl->cl_lock);
|
|
idr_preload_end();
|
|
if (new_id < 0)
|
|
goto out_free;
|
|
stid->sc_client = cl;
|
|
stid->sc_stateid.si_opaque.so_id = new_id;
|
|
stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
|
|
/* Will be incremented before return to client: */
|
|
atomic_set(&stid->sc_count, 1);
|
|
spin_lock_init(&stid->sc_lock);
|
|
|
|
/*
|
|
* It shouldn't be a problem to reuse an opaque stateid value.
|
|
* I don't think it is for 4.1. But with 4.0 I worry that, for
|
|
* example, a stray write retransmission could be accepted by
|
|
* the server when it should have been rejected. Therefore,
|
|
* adopt a trick from the sctp code to attempt to maximize the
|
|
* amount of time until an id is reused, by ensuring they always
|
|
* "increase" (mod INT_MAX):
|
|
*/
|
|
return stid;
|
|
out_free:
|
|
kmem_cache_free(slab, stid);
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_stid *stid;
|
|
struct nfs4_ol_stateid *stp;
|
|
|
|
stid = nfs4_alloc_stid(clp, stateid_slab);
|
|
if (!stid)
|
|
return NULL;
|
|
|
|
stp = openlockstateid(stid);
|
|
stp->st_stid.sc_free = nfs4_free_ol_stateid;
|
|
return stp;
|
|
}
|
|
|
|
static void nfs4_free_deleg(struct nfs4_stid *stid)
|
|
{
|
|
kmem_cache_free(deleg_slab, stid);
|
|
atomic_long_dec(&num_delegations);
|
|
}
|
|
|
|
/*
|
|
* When we recall a delegation, we should be careful not to hand it
|
|
* out again straight away.
|
|
* To ensure this we keep a pair of bloom filters ('new' and 'old')
|
|
* in which the filehandles of recalled delegations are "stored".
|
|
* If a filehandle appear in either filter, a delegation is blocked.
|
|
* When a delegation is recalled, the filehandle is stored in the "new"
|
|
* filter.
|
|
* Every 30 seconds we swap the filters and clear the "new" one,
|
|
* unless both are empty of course.
|
|
*
|
|
* Each filter is 256 bits. We hash the filehandle to 32bit and use the
|
|
* low 3 bytes as hash-table indices.
|
|
*
|
|
* 'blocked_delegations_lock', which is always taken in block_delegations(),
|
|
* is used to manage concurrent access. Testing does not need the lock
|
|
* except when swapping the two filters.
|
|
*/
|
|
static DEFINE_SPINLOCK(blocked_delegations_lock);
|
|
static struct bloom_pair {
|
|
int entries, old_entries;
|
|
time_t swap_time;
|
|
int new; /* index into 'set' */
|
|
DECLARE_BITMAP(set[2], 256);
|
|
} blocked_delegations;
|
|
|
|
static int delegation_blocked(struct knfsd_fh *fh)
|
|
{
|
|
u32 hash;
|
|
struct bloom_pair *bd = &blocked_delegations;
|
|
|
|
if (bd->entries == 0)
|
|
return 0;
|
|
if (seconds_since_boot() - bd->swap_time > 30) {
|
|
spin_lock(&blocked_delegations_lock);
|
|
if (seconds_since_boot() - bd->swap_time > 30) {
|
|
bd->entries -= bd->old_entries;
|
|
bd->old_entries = bd->entries;
|
|
memset(bd->set[bd->new], 0,
|
|
sizeof(bd->set[0]));
|
|
bd->new = 1-bd->new;
|
|
bd->swap_time = seconds_since_boot();
|
|
}
|
|
spin_unlock(&blocked_delegations_lock);
|
|
}
|
|
hash = jhash(&fh->fh_base, fh->fh_size, 0);
|
|
if (test_bit(hash&255, bd->set[0]) &&
|
|
test_bit((hash>>8)&255, bd->set[0]) &&
|
|
test_bit((hash>>16)&255, bd->set[0]))
|
|
return 1;
|
|
|
|
if (test_bit(hash&255, bd->set[1]) &&
|
|
test_bit((hash>>8)&255, bd->set[1]) &&
|
|
test_bit((hash>>16)&255, bd->set[1]))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void block_delegations(struct knfsd_fh *fh)
|
|
{
|
|
u32 hash;
|
|
struct bloom_pair *bd = &blocked_delegations;
|
|
|
|
hash = jhash(&fh->fh_base, fh->fh_size, 0);
|
|
|
|
spin_lock(&blocked_delegations_lock);
|
|
__set_bit(hash&255, bd->set[bd->new]);
|
|
__set_bit((hash>>8)&255, bd->set[bd->new]);
|
|
__set_bit((hash>>16)&255, bd->set[bd->new]);
|
|
if (bd->entries == 0)
|
|
bd->swap_time = seconds_since_boot();
|
|
bd->entries += 1;
|
|
spin_unlock(&blocked_delegations_lock);
|
|
}
|
|
|
|
static struct nfs4_delegation *
|
|
alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
|
|
struct nfs4_clnt_odstate *odstate)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
long n;
|
|
|
|
dprintk("NFSD alloc_init_deleg\n");
|
|
n = atomic_long_inc_return(&num_delegations);
|
|
if (n < 0 || n > max_delegations)
|
|
goto out_dec;
|
|
if (delegation_blocked(¤t_fh->fh_handle))
|
|
goto out_dec;
|
|
dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
|
|
if (dp == NULL)
|
|
goto out_dec;
|
|
|
|
dp->dl_stid.sc_free = nfs4_free_deleg;
|
|
/*
|
|
* delegation seqid's are never incremented. The 4.1 special
|
|
* meaning of seqid 0 isn't meaningful, really, but let's avoid
|
|
* 0 anyway just for consistency and use 1:
|
|
*/
|
|
dp->dl_stid.sc_stateid.si_generation = 1;
|
|
INIT_LIST_HEAD(&dp->dl_perfile);
|
|
INIT_LIST_HEAD(&dp->dl_perclnt);
|
|
INIT_LIST_HEAD(&dp->dl_recall_lru);
|
|
dp->dl_clnt_odstate = odstate;
|
|
get_clnt_odstate(odstate);
|
|
dp->dl_type = NFS4_OPEN_DELEGATE_READ;
|
|
dp->dl_retries = 1;
|
|
nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
|
|
&nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
|
|
return dp;
|
|
out_dec:
|
|
atomic_long_dec(&num_delegations);
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
nfs4_put_stid(struct nfs4_stid *s)
|
|
{
|
|
struct nfs4_file *fp = s->sc_file;
|
|
struct nfs4_client *clp = s->sc_client;
|
|
|
|
might_lock(&clp->cl_lock);
|
|
|
|
if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
|
|
wake_up_all(&close_wq);
|
|
return;
|
|
}
|
|
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
|
|
spin_unlock(&clp->cl_lock);
|
|
s->sc_free(s);
|
|
if (fp)
|
|
put_nfs4_file(fp);
|
|
}
|
|
|
|
void
|
|
nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
|
|
{
|
|
stateid_t *src = &stid->sc_stateid;
|
|
|
|
spin_lock(&stid->sc_lock);
|
|
if (unlikely(++src->si_generation == 0))
|
|
src->si_generation = 1;
|
|
memcpy(dst, src, sizeof(*dst));
|
|
spin_unlock(&stid->sc_lock);
|
|
}
|
|
|
|
static void nfs4_put_deleg_lease(struct nfs4_file *fp)
|
|
{
|
|
struct file *filp = NULL;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
if (fp->fi_deleg_file && --fp->fi_delegees == 0)
|
|
swap(filp, fp->fi_deleg_file);
|
|
spin_unlock(&fp->fi_lock);
|
|
|
|
if (filp) {
|
|
vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
|
|
fput(filp);
|
|
}
|
|
}
|
|
|
|
void nfs4_unhash_stid(struct nfs4_stid *s)
|
|
{
|
|
s->sc_type = 0;
|
|
}
|
|
|
|
/**
|
|
* nfs4_get_existing_delegation - Discover if this delegation already exists
|
|
* @clp: a pointer to the nfs4_client we're granting a delegation to
|
|
* @fp: a pointer to the nfs4_file we're granting a delegation on
|
|
*
|
|
* Return:
|
|
* On success: NULL if an existing delegation was not found.
|
|
*
|
|
* On error: -EAGAIN if one was previously granted to this nfs4_client
|
|
* for this nfs4_file.
|
|
*
|
|
*/
|
|
|
|
static int
|
|
nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
|
|
{
|
|
struct nfs4_delegation *searchdp = NULL;
|
|
struct nfs4_client *searchclp = NULL;
|
|
|
|
lockdep_assert_held(&state_lock);
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
|
|
list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
|
|
searchclp = searchdp->dl_stid.sc_client;
|
|
if (clp == searchclp) {
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* hash_delegation_locked - Add a delegation to the appropriate lists
|
|
* @dp: a pointer to the nfs4_delegation we are adding.
|
|
* @fp: a pointer to the nfs4_file we're granting a delegation on
|
|
*
|
|
* Return:
|
|
* On success: NULL if the delegation was successfully hashed.
|
|
*
|
|
* On error: -EAGAIN if one was previously granted to this
|
|
* nfs4_client for this nfs4_file. Delegation is not hashed.
|
|
*
|
|
*/
|
|
|
|
static int
|
|
hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
|
|
{
|
|
int status;
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
|
|
lockdep_assert_held(&state_lock);
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
|
|
status = nfs4_get_existing_delegation(clp, fp);
|
|
if (status)
|
|
return status;
|
|
++fp->fi_delegees;
|
|
atomic_inc(&dp->dl_stid.sc_count);
|
|
dp->dl_stid.sc_type = NFS4_DELEG_STID;
|
|
list_add(&dp->dl_perfile, &fp->fi_delegations);
|
|
list_add(&dp->dl_perclnt, &clp->cl_delegations);
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
unhash_delegation_locked(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_file *fp = dp->dl_stid.sc_file;
|
|
|
|
lockdep_assert_held(&state_lock);
|
|
|
|
if (list_empty(&dp->dl_perfile))
|
|
return false;
|
|
|
|
dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
|
|
/* Ensure that deleg break won't try to requeue it */
|
|
++dp->dl_time;
|
|
spin_lock(&fp->fi_lock);
|
|
list_del_init(&dp->dl_perclnt);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
list_del_init(&dp->dl_perfile);
|
|
spin_unlock(&fp->fi_lock);
|
|
return true;
|
|
}
|
|
|
|
static void destroy_delegation(struct nfs4_delegation *dp)
|
|
{
|
|
bool unhashed;
|
|
|
|
spin_lock(&state_lock);
|
|
unhashed = unhash_delegation_locked(dp);
|
|
spin_unlock(&state_lock);
|
|
if (unhashed) {
|
|
put_clnt_odstate(dp->dl_clnt_odstate);
|
|
nfs4_put_deleg_lease(dp->dl_stid.sc_file);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
}
|
|
|
|
static void revoke_delegation(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
|
|
WARN_ON(!list_empty(&dp->dl_recall_lru));
|
|
|
|
put_clnt_odstate(dp->dl_clnt_odstate);
|
|
nfs4_put_deleg_lease(dp->dl_stid.sc_file);
|
|
|
|
if (clp->cl_minorversion == 0)
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
else {
|
|
dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
|
|
spin_lock(&clp->cl_lock);
|
|
list_add(&dp->dl_recall_lru, &clp->cl_revoked);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* SETCLIENTID state
|
|
*/
|
|
|
|
static unsigned int clientid_hashval(u32 id)
|
|
{
|
|
return id & CLIENT_HASH_MASK;
|
|
}
|
|
|
|
static unsigned int clientstr_hashval(const char *name)
|
|
{
|
|
return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
|
|
}
|
|
|
|
/*
|
|
* We store the NONE, READ, WRITE, and BOTH bits separately in the
|
|
* st_{access,deny}_bmap field of the stateid, in order to track not
|
|
* only what share bits are currently in force, but also what
|
|
* combinations of share bits previous opens have used. This allows us
|
|
* to enforce the recommendation of rfc 3530 14.2.19 that the server
|
|
* return an error if the client attempt to downgrade to a combination
|
|
* of share bits not explicable by closing some of its previous opens.
|
|
*
|
|
* XXX: This enforcement is actually incomplete, since we don't keep
|
|
* track of access/deny bit combinations; so, e.g., we allow:
|
|
*
|
|
* OPEN allow read, deny write
|
|
* OPEN allow both, deny none
|
|
* DOWNGRADE allow read, deny none
|
|
*
|
|
* which we should reject.
|
|
*/
|
|
static unsigned int
|
|
bmap_to_share_mode(unsigned long bmap) {
|
|
int i;
|
|
unsigned int access = 0;
|
|
|
|
for (i = 1; i < 4; i++) {
|
|
if (test_bit(i, &bmap))
|
|
access |= i;
|
|
}
|
|
return access;
|
|
}
|
|
|
|
/* set share access for a given stateid */
|
|
static inline void
|
|
set_access(u32 access, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << access;
|
|
|
|
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
|
|
stp->st_access_bmap |= mask;
|
|
}
|
|
|
|
/* clear share access for a given stateid */
|
|
static inline void
|
|
clear_access(u32 access, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << access;
|
|
|
|
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
|
|
stp->st_access_bmap &= ~mask;
|
|
}
|
|
|
|
/* test whether a given stateid has access */
|
|
static inline bool
|
|
test_access(u32 access, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << access;
|
|
|
|
return (bool)(stp->st_access_bmap & mask);
|
|
}
|
|
|
|
/* set share deny for a given stateid */
|
|
static inline void
|
|
set_deny(u32 deny, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << deny;
|
|
|
|
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
|
|
stp->st_deny_bmap |= mask;
|
|
}
|
|
|
|
/* clear share deny for a given stateid */
|
|
static inline void
|
|
clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << deny;
|
|
|
|
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
|
|
stp->st_deny_bmap &= ~mask;
|
|
}
|
|
|
|
/* test whether a given stateid is denying specific access */
|
|
static inline bool
|
|
test_deny(u32 deny, struct nfs4_ol_stateid *stp)
|
|
{
|
|
unsigned char mask = 1 << deny;
|
|
|
|
return (bool)(stp->st_deny_bmap & mask);
|
|
}
|
|
|
|
static int nfs4_access_to_omode(u32 access)
|
|
{
|
|
switch (access & NFS4_SHARE_ACCESS_BOTH) {
|
|
case NFS4_SHARE_ACCESS_READ:
|
|
return O_RDONLY;
|
|
case NFS4_SHARE_ACCESS_WRITE:
|
|
return O_WRONLY;
|
|
case NFS4_SHARE_ACCESS_BOTH:
|
|
return O_RDWR;
|
|
}
|
|
WARN_ON_ONCE(1);
|
|
return O_RDONLY;
|
|
}
|
|
|
|
/*
|
|
* A stateid that had a deny mode associated with it is being released
|
|
* or downgraded. Recalculate the deny mode on the file.
|
|
*/
|
|
static void
|
|
recalculate_deny_mode(struct nfs4_file *fp)
|
|
{
|
|
struct nfs4_ol_stateid *stp;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
fp->fi_share_deny = 0;
|
|
list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
|
|
fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
|
|
spin_unlock(&fp->fi_lock);
|
|
}
|
|
|
|
static void
|
|
reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
|
|
{
|
|
int i;
|
|
bool change = false;
|
|
|
|
for (i = 1; i < 4; i++) {
|
|
if ((i & deny) != i) {
|
|
change = true;
|
|
clear_deny(i, stp);
|
|
}
|
|
}
|
|
|
|
/* Recalculate per-file deny mode if there was a change */
|
|
if (change)
|
|
recalculate_deny_mode(stp->st_stid.sc_file);
|
|
}
|
|
|
|
/* release all access and file references for a given stateid */
|
|
static void
|
|
release_all_access(struct nfs4_ol_stateid *stp)
|
|
{
|
|
int i;
|
|
struct nfs4_file *fp = stp->st_stid.sc_file;
|
|
|
|
if (fp && stp->st_deny_bmap != 0)
|
|
recalculate_deny_mode(fp);
|
|
|
|
for (i = 1; i < 4; i++) {
|
|
if (test_access(i, stp))
|
|
nfs4_file_put_access(stp->st_stid.sc_file, i);
|
|
clear_access(i, stp);
|
|
}
|
|
}
|
|
|
|
static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
|
|
{
|
|
kfree(sop->so_owner.data);
|
|
sop->so_ops->so_free(sop);
|
|
}
|
|
|
|
static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
|
|
{
|
|
struct nfs4_client *clp = sop->so_client;
|
|
|
|
might_lock(&clp->cl_lock);
|
|
|
|
if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
|
|
return;
|
|
sop->so_ops->so_unhash(sop);
|
|
spin_unlock(&clp->cl_lock);
|
|
nfs4_free_stateowner(sop);
|
|
}
|
|
|
|
static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct nfs4_file *fp = stp->st_stid.sc_file;
|
|
|
|
lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
|
|
|
|
if (list_empty(&stp->st_perfile))
|
|
return false;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
list_del_init(&stp->st_perfile);
|
|
spin_unlock(&fp->fi_lock);
|
|
list_del(&stp->st_perstateowner);
|
|
return true;
|
|
}
|
|
|
|
static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
|
|
{
|
|
struct nfs4_ol_stateid *stp = openlockstateid(stid);
|
|
|
|
put_clnt_odstate(stp->st_clnt_odstate);
|
|
release_all_access(stp);
|
|
if (stp->st_stateowner)
|
|
nfs4_put_stateowner(stp->st_stateowner);
|
|
kmem_cache_free(stateid_slab, stid);
|
|
}
|
|
|
|
static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
|
|
{
|
|
struct nfs4_ol_stateid *stp = openlockstateid(stid);
|
|
struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
|
|
struct file *file;
|
|
|
|
file = find_any_file(stp->st_stid.sc_file);
|
|
if (file)
|
|
filp_close(file, (fl_owner_t)lo);
|
|
nfs4_free_ol_stateid(stid);
|
|
}
|
|
|
|
/*
|
|
* Put the persistent reference to an already unhashed generic stateid, while
|
|
* holding the cl_lock. If it's the last reference, then put it onto the
|
|
* reaplist for later destruction.
|
|
*/
|
|
static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
|
|
struct list_head *reaplist)
|
|
{
|
|
struct nfs4_stid *s = &stp->st_stid;
|
|
struct nfs4_client *clp = s->sc_client;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
WARN_ON_ONCE(!list_empty(&stp->st_locks));
|
|
|
|
if (!atomic_dec_and_test(&s->sc_count)) {
|
|
wake_up_all(&close_wq);
|
|
return;
|
|
}
|
|
|
|
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
|
|
list_add(&stp->st_locks, reaplist);
|
|
}
|
|
|
|
static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
|
|
|
|
lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
|
|
|
|
list_del_init(&stp->st_locks);
|
|
nfs4_unhash_stid(&stp->st_stid);
|
|
return unhash_ol_stateid(stp);
|
|
}
|
|
|
|
static void release_lock_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
|
|
bool unhashed;
|
|
|
|
spin_lock(&oo->oo_owner.so_client->cl_lock);
|
|
unhashed = unhash_lock_stateid(stp);
|
|
spin_unlock(&oo->oo_owner.so_client->cl_lock);
|
|
if (unhashed)
|
|
nfs4_put_stid(&stp->st_stid);
|
|
}
|
|
|
|
static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
|
|
{
|
|
struct nfs4_client *clp = lo->lo_owner.so_client;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
list_del_init(&lo->lo_owner.so_strhash);
|
|
}
|
|
|
|
/*
|
|
* Free a list of generic stateids that were collected earlier after being
|
|
* fully unhashed.
|
|
*/
|
|
static void
|
|
free_ol_stateid_reaplist(struct list_head *reaplist)
|
|
{
|
|
struct nfs4_ol_stateid *stp;
|
|
struct nfs4_file *fp;
|
|
|
|
might_sleep();
|
|
|
|
while (!list_empty(reaplist)) {
|
|
stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
|
|
st_locks);
|
|
list_del(&stp->st_locks);
|
|
fp = stp->st_stid.sc_file;
|
|
stp->st_stid.sc_free(&stp->st_stid);
|
|
if (fp)
|
|
put_nfs4_file(fp);
|
|
}
|
|
}
|
|
|
|
static void release_lockowner(struct nfs4_lockowner *lo)
|
|
{
|
|
struct nfs4_client *clp = lo->lo_owner.so_client;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct list_head reaplist;
|
|
|
|
INIT_LIST_HEAD(&reaplist);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
unhash_lockowner_locked(lo);
|
|
while (!list_empty(&lo->lo_owner.so_stateids)) {
|
|
stp = list_first_entry(&lo->lo_owner.so_stateids,
|
|
struct nfs4_ol_stateid, st_perstateowner);
|
|
WARN_ON(!unhash_lock_stateid(stp));
|
|
put_ol_stateid_locked(stp, &reaplist);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
free_ol_stateid_reaplist(&reaplist);
|
|
nfs4_put_stateowner(&lo->lo_owner);
|
|
}
|
|
|
|
static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
|
|
struct list_head *reaplist)
|
|
{
|
|
struct nfs4_ol_stateid *stp;
|
|
|
|
lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
|
|
|
|
while (!list_empty(&open_stp->st_locks)) {
|
|
stp = list_entry(open_stp->st_locks.next,
|
|
struct nfs4_ol_stateid, st_locks);
|
|
WARN_ON(!unhash_lock_stateid(stp));
|
|
put_ol_stateid_locked(stp, reaplist);
|
|
}
|
|
}
|
|
|
|
static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
|
|
struct list_head *reaplist)
|
|
{
|
|
bool unhashed;
|
|
|
|
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
|
|
|
|
unhashed = unhash_ol_stateid(stp);
|
|
release_open_stateid_locks(stp, reaplist);
|
|
return unhashed;
|
|
}
|
|
|
|
static void release_open_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
LIST_HEAD(reaplist);
|
|
|
|
spin_lock(&stp->st_stid.sc_client->cl_lock);
|
|
if (unhash_open_stateid(stp, &reaplist))
|
|
put_ol_stateid_locked(stp, &reaplist);
|
|
spin_unlock(&stp->st_stid.sc_client->cl_lock);
|
|
free_ol_stateid_reaplist(&reaplist);
|
|
}
|
|
|
|
static void unhash_openowner_locked(struct nfs4_openowner *oo)
|
|
{
|
|
struct nfs4_client *clp = oo->oo_owner.so_client;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
list_del_init(&oo->oo_owner.so_strhash);
|
|
list_del_init(&oo->oo_perclient);
|
|
}
|
|
|
|
static void release_last_closed_stateid(struct nfs4_openowner *oo)
|
|
{
|
|
struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
|
|
nfsd_net_id);
|
|
struct nfs4_ol_stateid *s;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
s = oo->oo_last_closed_stid;
|
|
if (s) {
|
|
list_del_init(&oo->oo_close_lru);
|
|
oo->oo_last_closed_stid = NULL;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
if (s)
|
|
nfs4_put_stid(&s->st_stid);
|
|
}
|
|
|
|
static void release_openowner(struct nfs4_openowner *oo)
|
|
{
|
|
struct nfs4_ol_stateid *stp;
|
|
struct nfs4_client *clp = oo->oo_owner.so_client;
|
|
struct list_head reaplist;
|
|
|
|
INIT_LIST_HEAD(&reaplist);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
unhash_openowner_locked(oo);
|
|
while (!list_empty(&oo->oo_owner.so_stateids)) {
|
|
stp = list_first_entry(&oo->oo_owner.so_stateids,
|
|
struct nfs4_ol_stateid, st_perstateowner);
|
|
if (unhash_open_stateid(stp, &reaplist))
|
|
put_ol_stateid_locked(stp, &reaplist);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
free_ol_stateid_reaplist(&reaplist);
|
|
release_last_closed_stateid(oo);
|
|
nfs4_put_stateowner(&oo->oo_owner);
|
|
}
|
|
|
|
static inline int
|
|
hash_sessionid(struct nfs4_sessionid *sessionid)
|
|
{
|
|
struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
|
|
|
|
return sid->sequence % SESSION_HASH_SIZE;
|
|
}
|
|
|
|
#ifdef CONFIG_SUNRPC_DEBUG
|
|
static inline void
|
|
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
|
|
{
|
|
u32 *ptr = (u32 *)(&sessionid->data[0]);
|
|
dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
|
|
}
|
|
#else
|
|
static inline void
|
|
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Bump the seqid on cstate->replay_owner, and clear replay_owner if it
|
|
* won't be used for replay.
|
|
*/
|
|
void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
|
|
{
|
|
struct nfs4_stateowner *so = cstate->replay_owner;
|
|
|
|
if (nfserr == nfserr_replay_me)
|
|
return;
|
|
|
|
if (!seqid_mutating_err(ntohl(nfserr))) {
|
|
nfsd4_cstate_clear_replay(cstate);
|
|
return;
|
|
}
|
|
if (!so)
|
|
return;
|
|
if (so->so_is_open_owner)
|
|
release_last_closed_stateid(openowner(so));
|
|
so->so_seqid++;
|
|
return;
|
|
}
|
|
|
|
static void
|
|
gen_sessionid(struct nfsd4_session *ses)
|
|
{
|
|
struct nfs4_client *clp = ses->se_client;
|
|
struct nfsd4_sessionid *sid;
|
|
|
|
sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
|
|
sid->clientid = clp->cl_clientid;
|
|
sid->sequence = current_sessionid++;
|
|
sid->reserved = 0;
|
|
}
|
|
|
|
/*
|
|
* The protocol defines ca_maxresponssize_cached to include the size of
|
|
* the rpc header, but all we need to cache is the data starting after
|
|
* the end of the initial SEQUENCE operation--the rest we regenerate
|
|
* each time. Therefore we can advertise a ca_maxresponssize_cached
|
|
* value that is the number of bytes in our cache plus a few additional
|
|
* bytes. In order to stay on the safe side, and not promise more than
|
|
* we can cache, those additional bytes must be the minimum possible: 24
|
|
* bytes of rpc header (xid through accept state, with AUTH_NULL
|
|
* verifier), 12 for the compound header (with zero-length tag), and 44
|
|
* for the SEQUENCE op response:
|
|
*/
|
|
#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
|
|
|
|
static void
|
|
free_session_slots(struct nfsd4_session *ses)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ses->se_fchannel.maxreqs; i++)
|
|
kfree(ses->se_slots[i]);
|
|
}
|
|
|
|
/*
|
|
* We don't actually need to cache the rpc and session headers, so we
|
|
* can allocate a little less for each slot:
|
|
*/
|
|
static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
|
|
{
|
|
u32 size;
|
|
|
|
if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
|
|
size = 0;
|
|
else
|
|
size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
|
|
return size + sizeof(struct nfsd4_slot);
|
|
}
|
|
|
|
/*
|
|
* XXX: If we run out of reserved DRC memory we could (up to a point)
|
|
* re-negotiate active sessions and reduce their slot usage to make
|
|
* room for new connections. For now we just fail the create session.
|
|
*/
|
|
static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
|
|
{
|
|
u32 slotsize = slot_bytes(ca);
|
|
u32 num = ca->maxreqs;
|
|
int avail;
|
|
|
|
spin_lock(&nfsd_drc_lock);
|
|
avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
|
|
nfsd_drc_max_mem - nfsd_drc_mem_used);
|
|
num = min_t(int, num, avail / slotsize);
|
|
nfsd_drc_mem_used += num * slotsize;
|
|
spin_unlock(&nfsd_drc_lock);
|
|
|
|
return num;
|
|
}
|
|
|
|
static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
|
|
{
|
|
int slotsize = slot_bytes(ca);
|
|
|
|
spin_lock(&nfsd_drc_lock);
|
|
nfsd_drc_mem_used -= slotsize * ca->maxreqs;
|
|
spin_unlock(&nfsd_drc_lock);
|
|
}
|
|
|
|
static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
|
|
struct nfsd4_channel_attrs *battrs)
|
|
{
|
|
int numslots = fattrs->maxreqs;
|
|
int slotsize = slot_bytes(fattrs);
|
|
struct nfsd4_session *new;
|
|
int mem, i;
|
|
|
|
BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
|
|
+ sizeof(struct nfsd4_session) > PAGE_SIZE);
|
|
mem = numslots * sizeof(struct nfsd4_slot *);
|
|
|
|
new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
|
|
if (!new)
|
|
return NULL;
|
|
/* allocate each struct nfsd4_slot and data cache in one piece */
|
|
for (i = 0; i < numslots; i++) {
|
|
new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
|
|
if (!new->se_slots[i])
|
|
goto out_free;
|
|
}
|
|
|
|
memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
|
|
memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
|
|
|
|
return new;
|
|
out_free:
|
|
while (i--)
|
|
kfree(new->se_slots[i]);
|
|
kfree(new);
|
|
return NULL;
|
|
}
|
|
|
|
static void free_conn(struct nfsd4_conn *c)
|
|
{
|
|
svc_xprt_put(c->cn_xprt);
|
|
kfree(c);
|
|
}
|
|
|
|
static void nfsd4_conn_lost(struct svc_xpt_user *u)
|
|
{
|
|
struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
|
|
struct nfs4_client *clp = c->cn_session->se_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
if (!list_empty(&c->cn_persession)) {
|
|
list_del(&c->cn_persession);
|
|
free_conn(c);
|
|
}
|
|
nfsd4_probe_callback(clp);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
|
|
{
|
|
struct nfsd4_conn *conn;
|
|
|
|
conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
|
|
if (!conn)
|
|
return NULL;
|
|
svc_xprt_get(rqstp->rq_xprt);
|
|
conn->cn_xprt = rqstp->rq_xprt;
|
|
conn->cn_flags = flags;
|
|
INIT_LIST_HEAD(&conn->cn_xpt_user.list);
|
|
return conn;
|
|
}
|
|
|
|
static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
|
|
{
|
|
conn->cn_session = ses;
|
|
list_add(&conn->cn_persession, &ses->se_conns);
|
|
}
|
|
|
|
static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
|
|
{
|
|
struct nfs4_client *clp = ses->se_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
__nfsd4_hash_conn(conn, ses);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static int nfsd4_register_conn(struct nfsd4_conn *conn)
|
|
{
|
|
conn->cn_xpt_user.callback = nfsd4_conn_lost;
|
|
return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
|
|
}
|
|
|
|
static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
|
|
{
|
|
int ret;
|
|
|
|
nfsd4_hash_conn(conn, ses);
|
|
ret = nfsd4_register_conn(conn);
|
|
if (ret)
|
|
/* oops; xprt is already down: */
|
|
nfsd4_conn_lost(&conn->cn_xpt_user);
|
|
/* We may have gained or lost a callback channel: */
|
|
nfsd4_probe_callback_sync(ses->se_client);
|
|
}
|
|
|
|
static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
|
|
{
|
|
u32 dir = NFS4_CDFC4_FORE;
|
|
|
|
if (cses->flags & SESSION4_BACK_CHAN)
|
|
dir |= NFS4_CDFC4_BACK;
|
|
return alloc_conn(rqstp, dir);
|
|
}
|
|
|
|
/* must be called under client_lock */
|
|
static void nfsd4_del_conns(struct nfsd4_session *s)
|
|
{
|
|
struct nfs4_client *clp = s->se_client;
|
|
struct nfsd4_conn *c;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
while (!list_empty(&s->se_conns)) {
|
|
c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
|
|
list_del_init(&c->cn_persession);
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
|
|
free_conn(c);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static void __free_session(struct nfsd4_session *ses)
|
|
{
|
|
free_session_slots(ses);
|
|
kfree(ses);
|
|
}
|
|
|
|
static void free_session(struct nfsd4_session *ses)
|
|
{
|
|
nfsd4_del_conns(ses);
|
|
nfsd4_put_drc_mem(&ses->se_fchannel);
|
|
__free_session(ses);
|
|
}
|
|
|
|
static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
|
|
{
|
|
int idx;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
new->se_client = clp;
|
|
gen_sessionid(new);
|
|
|
|
INIT_LIST_HEAD(&new->se_conns);
|
|
|
|
new->se_cb_seq_nr = 1;
|
|
new->se_flags = cses->flags;
|
|
new->se_cb_prog = cses->callback_prog;
|
|
new->se_cb_sec = cses->cb_sec;
|
|
atomic_set(&new->se_ref, 0);
|
|
idx = hash_sessionid(&new->se_sessionid);
|
|
list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
|
|
spin_lock(&clp->cl_lock);
|
|
list_add(&new->se_perclnt, &clp->cl_sessions);
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
{
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
/*
|
|
* This is a little silly; with sessions there's no real
|
|
* use for the callback address. Use the peer address
|
|
* as a reasonable default for now, but consider fixing
|
|
* the rpc client not to require an address in the
|
|
* future:
|
|
*/
|
|
rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
|
|
clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
|
|
}
|
|
}
|
|
|
|
/* caller must hold client_lock */
|
|
static struct nfsd4_session *
|
|
__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
|
|
{
|
|
struct nfsd4_session *elem;
|
|
int idx;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
dump_sessionid(__func__, sessionid);
|
|
idx = hash_sessionid(sessionid);
|
|
/* Search in the appropriate list */
|
|
list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
|
|
if (!memcmp(elem->se_sessionid.data, sessionid->data,
|
|
NFS4_MAX_SESSIONID_LEN)) {
|
|
return elem;
|
|
}
|
|
}
|
|
|
|
dprintk("%s: session not found\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfsd4_session *
|
|
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
|
|
__be32 *ret)
|
|
{
|
|
struct nfsd4_session *session;
|
|
__be32 status = nfserr_badsession;
|
|
|
|
session = __find_in_sessionid_hashtbl(sessionid, net);
|
|
if (!session)
|
|
goto out;
|
|
status = nfsd4_get_session_locked(session);
|
|
if (status)
|
|
session = NULL;
|
|
out:
|
|
*ret = status;
|
|
return session;
|
|
}
|
|
|
|
/* caller must hold client_lock */
|
|
static void
|
|
unhash_session(struct nfsd4_session *ses)
|
|
{
|
|
struct nfs4_client *clp = ses->se_client;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
list_del(&ses->se_hash);
|
|
spin_lock(&ses->se_client->cl_lock);
|
|
list_del(&ses->se_perclnt);
|
|
spin_unlock(&ses->se_client->cl_lock);
|
|
}
|
|
|
|
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
|
|
static int
|
|
STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
|
|
{
|
|
/*
|
|
* We're assuming the clid was not given out from a boot
|
|
* precisely 2^32 (about 136 years) before this one. That seems
|
|
* a safe assumption:
|
|
*/
|
|
if (clid->cl_boot == (u32)nn->boot_time)
|
|
return 0;
|
|
dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
|
|
clid->cl_boot, clid->cl_id, nn->boot_time);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* XXX Should we use a slab cache ?
|
|
* This type of memory management is somewhat inefficient, but we use it
|
|
* anyway since SETCLIENTID is not a common operation.
|
|
*/
|
|
static struct nfs4_client *alloc_client(struct xdr_netobj name)
|
|
{
|
|
struct nfs4_client *clp;
|
|
int i;
|
|
|
|
clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
|
|
if (clp == NULL)
|
|
return NULL;
|
|
clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
|
|
if (clp->cl_name.data == NULL)
|
|
goto err_no_name;
|
|
clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
|
|
OWNER_HASH_SIZE, GFP_KERNEL);
|
|
if (!clp->cl_ownerstr_hashtbl)
|
|
goto err_no_hashtbl;
|
|
for (i = 0; i < OWNER_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
|
|
clp->cl_name.len = name.len;
|
|
INIT_LIST_HEAD(&clp->cl_sessions);
|
|
idr_init(&clp->cl_stateids);
|
|
atomic_set(&clp->cl_refcount, 0);
|
|
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
|
|
INIT_LIST_HEAD(&clp->cl_idhash);
|
|
INIT_LIST_HEAD(&clp->cl_openowners);
|
|
INIT_LIST_HEAD(&clp->cl_delegations);
|
|
INIT_LIST_HEAD(&clp->cl_lru);
|
|
INIT_LIST_HEAD(&clp->cl_revoked);
|
|
#ifdef CONFIG_NFSD_PNFS
|
|
INIT_LIST_HEAD(&clp->cl_lo_states);
|
|
#endif
|
|
spin_lock_init(&clp->cl_lock);
|
|
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
|
|
return clp;
|
|
err_no_hashtbl:
|
|
kfree(clp->cl_name.data);
|
|
err_no_name:
|
|
kfree(clp);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
free_client(struct nfs4_client *clp)
|
|
{
|
|
while (!list_empty(&clp->cl_sessions)) {
|
|
struct nfsd4_session *ses;
|
|
ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
|
|
se_perclnt);
|
|
list_del(&ses->se_perclnt);
|
|
WARN_ON_ONCE(atomic_read(&ses->se_ref));
|
|
free_session(ses);
|
|
}
|
|
rpc_destroy_wait_queue(&clp->cl_cb_waitq);
|
|
free_svc_cred(&clp->cl_cred);
|
|
kfree(clp->cl_ownerstr_hashtbl);
|
|
kfree(clp->cl_name.data);
|
|
idr_destroy(&clp->cl_stateids);
|
|
kfree(clp);
|
|
}
|
|
|
|
/* must be called under the client_lock */
|
|
static void
|
|
unhash_client_locked(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
struct nfsd4_session *ses;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
/* Mark the client as expired! */
|
|
clp->cl_time = 0;
|
|
/* Make it invisible */
|
|
if (!list_empty(&clp->cl_idhash)) {
|
|
list_del_init(&clp->cl_idhash);
|
|
if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
|
|
rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
|
|
else
|
|
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
|
|
}
|
|
list_del_init(&clp->cl_lru);
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
|
|
list_del_init(&ses->se_hash);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static void
|
|
unhash_client(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
spin_lock(&nn->client_lock);
|
|
unhash_client_locked(clp);
|
|
spin_unlock(&nn->client_lock);
|
|
}
|
|
|
|
static __be32 mark_client_expired_locked(struct nfs4_client *clp)
|
|
{
|
|
if (atomic_read(&clp->cl_refcount))
|
|
return nfserr_jukebox;
|
|
unhash_client_locked(clp);
|
|
return nfs_ok;
|
|
}
|
|
|
|
static void
|
|
__destroy_client(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_openowner *oo;
|
|
struct nfs4_delegation *dp;
|
|
struct list_head reaplist;
|
|
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&state_lock);
|
|
while (!list_empty(&clp->cl_delegations)) {
|
|
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
|
|
WARN_ON(!unhash_delegation_locked(dp));
|
|
list_add(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&state_lock);
|
|
while (!list_empty(&reaplist)) {
|
|
dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
put_clnt_odstate(dp->dl_clnt_odstate);
|
|
nfs4_put_deleg_lease(dp->dl_stid.sc_file);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
while (!list_empty(&clp->cl_revoked)) {
|
|
dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
while (!list_empty(&clp->cl_openowners)) {
|
|
oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
|
|
nfs4_get_stateowner(&oo->oo_owner);
|
|
release_openowner(oo);
|
|
}
|
|
nfsd4_return_all_client_layouts(clp);
|
|
nfsd4_shutdown_callback(clp);
|
|
if (clp->cl_cb_conn.cb_xprt)
|
|
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
|
|
free_client(clp);
|
|
}
|
|
|
|
static void
|
|
destroy_client(struct nfs4_client *clp)
|
|
{
|
|
unhash_client(clp);
|
|
__destroy_client(clp);
|
|
}
|
|
|
|
static void expire_client(struct nfs4_client *clp)
|
|
{
|
|
unhash_client(clp);
|
|
nfsd4_client_record_remove(clp);
|
|
__destroy_client(clp);
|
|
}
|
|
|
|
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
|
|
{
|
|
memcpy(target->cl_verifier.data, source->data,
|
|
sizeof(target->cl_verifier.data));
|
|
}
|
|
|
|
static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
|
|
{
|
|
target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
|
|
target->cl_clientid.cl_id = source->cl_clientid.cl_id;
|
|
}
|
|
|
|
int strdup_if_nonnull(char **target, char *source)
|
|
{
|
|
if (source) {
|
|
*target = kstrdup(source, GFP_KERNEL);
|
|
if (!*target)
|
|
return -ENOMEM;
|
|
} else
|
|
*target = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int copy_cred(struct svc_cred *target, struct svc_cred *source)
|
|
{
|
|
int ret;
|
|
|
|
ret = strdup_if_nonnull(&target->cr_principal, source->cr_principal);
|
|
if (ret)
|
|
return ret;
|
|
ret = strdup_if_nonnull(&target->cr_raw_principal,
|
|
source->cr_raw_principal);
|
|
if (ret)
|
|
return ret;
|
|
target->cr_flavor = source->cr_flavor;
|
|
target->cr_uid = source->cr_uid;
|
|
target->cr_gid = source->cr_gid;
|
|
target->cr_group_info = source->cr_group_info;
|
|
get_group_info(target->cr_group_info);
|
|
target->cr_gss_mech = source->cr_gss_mech;
|
|
if (source->cr_gss_mech)
|
|
gss_mech_get(source->cr_gss_mech);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
|
|
{
|
|
if (o1->len < o2->len)
|
|
return -1;
|
|
if (o1->len > o2->len)
|
|
return 1;
|
|
return memcmp(o1->data, o2->data, o1->len);
|
|
}
|
|
|
|
static int same_name(const char *n1, const char *n2)
|
|
{
|
|
return 0 == memcmp(n1, n2, HEXDIR_LEN);
|
|
}
|
|
|
|
static int
|
|
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
|
|
{
|
|
return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
|
|
}
|
|
|
|
static int
|
|
same_clid(clientid_t *cl1, clientid_t *cl2)
|
|
{
|
|
return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
|
|
}
|
|
|
|
static bool groups_equal(struct group_info *g1, struct group_info *g2)
|
|
{
|
|
int i;
|
|
|
|
if (g1->ngroups != g2->ngroups)
|
|
return false;
|
|
for (i=0; i<g1->ngroups; i++)
|
|
if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* RFC 3530 language requires clid_inuse be returned when the
|
|
* "principal" associated with a requests differs from that previously
|
|
* used. We use uid, gid's, and gss principal string as our best
|
|
* approximation. We also don't want to allow non-gss use of a client
|
|
* established using gss: in theory cr_principal should catch that
|
|
* change, but in practice cr_principal can be null even in the gss case
|
|
* since gssd doesn't always pass down a principal string.
|
|
*/
|
|
static bool is_gss_cred(struct svc_cred *cr)
|
|
{
|
|
/* Is cr_flavor one of the gss "pseudoflavors"?: */
|
|
return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
|
|
}
|
|
|
|
|
|
static bool
|
|
same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
|
|
{
|
|
if ((is_gss_cred(cr1) != is_gss_cred(cr2))
|
|
|| (!uid_eq(cr1->cr_uid, cr2->cr_uid))
|
|
|| (!gid_eq(cr1->cr_gid, cr2->cr_gid))
|
|
|| !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
|
|
return false;
|
|
if (cr1->cr_principal == cr2->cr_principal)
|
|
return true;
|
|
if (!cr1->cr_principal || !cr2->cr_principal)
|
|
return false;
|
|
return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
|
|
}
|
|
|
|
static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_cred *cr = &rqstp->rq_cred;
|
|
u32 service;
|
|
|
|
if (!cr->cr_gss_mech)
|
|
return false;
|
|
service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
|
|
return service == RPC_GSS_SVC_INTEGRITY ||
|
|
service == RPC_GSS_SVC_PRIVACY;
|
|
}
|
|
|
|
static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_cred *cr = &rqstp->rq_cred;
|
|
|
|
if (!cl->cl_mach_cred)
|
|
return true;
|
|
if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
|
|
return false;
|
|
if (!svc_rqst_integrity_protected(rqstp))
|
|
return false;
|
|
if (cl->cl_cred.cr_raw_principal)
|
|
return 0 == strcmp(cl->cl_cred.cr_raw_principal,
|
|
cr->cr_raw_principal);
|
|
if (!cr->cr_principal)
|
|
return false;
|
|
return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
|
|
}
|
|
|
|
static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
|
|
{
|
|
__be32 verf[2];
|
|
|
|
/*
|
|
* This is opaque to client, so no need to byte-swap. Use
|
|
* __force to keep sparse happy
|
|
*/
|
|
verf[0] = (__force __be32)get_seconds();
|
|
verf[1] = (__force __be32)nn->clverifier_counter++;
|
|
memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
|
|
}
|
|
|
|
static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
|
|
{
|
|
clp->cl_clientid.cl_boot = nn->boot_time;
|
|
clp->cl_clientid.cl_id = nn->clientid_counter++;
|
|
gen_confirm(clp, nn);
|
|
}
|
|
|
|
static struct nfs4_stid *
|
|
find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
|
|
{
|
|
struct nfs4_stid *ret;
|
|
|
|
ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
|
|
if (!ret || !ret->sc_type)
|
|
return NULL;
|
|
return ret;
|
|
}
|
|
|
|
static struct nfs4_stid *
|
|
find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
|
|
{
|
|
struct nfs4_stid *s;
|
|
|
|
spin_lock(&cl->cl_lock);
|
|
s = find_stateid_locked(cl, t);
|
|
if (s != NULL) {
|
|
if (typemask & s->sc_type)
|
|
atomic_inc(&s->sc_count);
|
|
else
|
|
s = NULL;
|
|
}
|
|
spin_unlock(&cl->cl_lock);
|
|
return s;
|
|
}
|
|
|
|
static struct nfs4_client *create_client(struct xdr_netobj name,
|
|
struct svc_rqst *rqstp, nfs4_verifier *verf)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
int ret;
|
|
struct net *net = SVC_NET(rqstp);
|
|
|
|
clp = alloc_client(name);
|
|
if (clp == NULL)
|
|
return NULL;
|
|
|
|
ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
|
|
if (ret) {
|
|
free_client(clp);
|
|
return NULL;
|
|
}
|
|
nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
|
|
clp->cl_time = get_seconds();
|
|
clear_bit(0, &clp->cl_cb_slot_busy);
|
|
copy_verf(clp, verf);
|
|
rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
|
|
clp->cl_cb_session = NULL;
|
|
clp->net = net;
|
|
return clp;
|
|
}
|
|
|
|
static void
|
|
add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
|
|
{
|
|
struct rb_node **new = &(root->rb_node), *parent = NULL;
|
|
struct nfs4_client *clp;
|
|
|
|
while (*new) {
|
|
clp = rb_entry(*new, struct nfs4_client, cl_namenode);
|
|
parent = *new;
|
|
|
|
if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
|
|
new = &((*new)->rb_left);
|
|
else
|
|
new = &((*new)->rb_right);
|
|
}
|
|
|
|
rb_link_node(&new_clp->cl_namenode, parent, new);
|
|
rb_insert_color(&new_clp->cl_namenode, root);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
|
|
{
|
|
int cmp;
|
|
struct rb_node *node = root->rb_node;
|
|
struct nfs4_client *clp;
|
|
|
|
while (node) {
|
|
clp = rb_entry(node, struct nfs4_client, cl_namenode);
|
|
cmp = compare_blob(&clp->cl_name, name);
|
|
if (cmp > 0)
|
|
node = node->rb_left;
|
|
else if (cmp < 0)
|
|
node = node->rb_right;
|
|
else
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
add_to_unconfirmed(struct nfs4_client *clp)
|
|
{
|
|
unsigned int idhashval;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
|
|
add_clp_to_name_tree(clp, &nn->unconf_name_tree);
|
|
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
|
|
list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
|
|
renew_client_locked(clp);
|
|
}
|
|
|
|
static void
|
|
move_to_confirmed(struct nfs4_client *clp)
|
|
{
|
|
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
|
|
list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
|
|
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
|
|
add_clp_to_name_tree(clp, &nn->conf_name_tree);
|
|
set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
|
|
renew_client_locked(clp);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
|
|
{
|
|
struct nfs4_client *clp;
|
|
unsigned int idhashval = clientid_hashval(clid->cl_id);
|
|
|
|
list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
|
|
if (same_clid(&clp->cl_clientid, clid)) {
|
|
if ((bool)clp->cl_minorversion != sessions)
|
|
return NULL;
|
|
renew_client_locked(clp);
|
|
return clp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
|
|
{
|
|
struct list_head *tbl = nn->conf_id_hashtbl;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
return find_client_in_id_table(tbl, clid, sessions);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
|
|
{
|
|
struct list_head *tbl = nn->unconf_id_hashtbl;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
return find_client_in_id_table(tbl, clid, sessions);
|
|
}
|
|
|
|
static bool clp_used_exchangeid(struct nfs4_client *clp)
|
|
{
|
|
return clp->cl_exchange_flags != 0;
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
|
|
{
|
|
lockdep_assert_held(&nn->client_lock);
|
|
return find_clp_in_name_tree(name, &nn->conf_name_tree);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
|
|
{
|
|
lockdep_assert_held(&nn->client_lock);
|
|
return find_clp_in_name_tree(name, &nn->unconf_name_tree);
|
|
}
|
|
|
|
static void
|
|
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
|
|
{
|
|
struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
u32 scopeid = rpc_get_scope_id(sa);
|
|
unsigned short expected_family;
|
|
|
|
/* Currently, we only support tcp and tcp6 for the callback channel */
|
|
if (se->se_callback_netid_len == 3 &&
|
|
!memcmp(se->se_callback_netid_val, "tcp", 3))
|
|
expected_family = AF_INET;
|
|
else if (se->se_callback_netid_len == 4 &&
|
|
!memcmp(se->se_callback_netid_val, "tcp6", 4))
|
|
expected_family = AF_INET6;
|
|
else
|
|
goto out_err;
|
|
|
|
conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
|
|
se->se_callback_addr_len,
|
|
(struct sockaddr *)&conn->cb_addr,
|
|
sizeof(conn->cb_addr));
|
|
|
|
if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
|
|
goto out_err;
|
|
|
|
if (conn->cb_addr.ss_family == AF_INET6)
|
|
((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
|
|
|
|
conn->cb_prog = se->se_callback_prog;
|
|
conn->cb_ident = se->se_callback_ident;
|
|
memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
|
|
return;
|
|
out_err:
|
|
conn->cb_addr.ss_family = AF_UNSPEC;
|
|
conn->cb_addrlen = 0;
|
|
dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
|
|
"will not receive delegations\n",
|
|
clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
|
|
*/
|
|
static void
|
|
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
|
|
{
|
|
struct xdr_buf *buf = resp->xdr.buf;
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
unsigned int base;
|
|
|
|
dprintk("--> %s slot %p\n", __func__, slot);
|
|
|
|
slot->sl_opcnt = resp->opcnt;
|
|
slot->sl_status = resp->cstate.status;
|
|
|
|
slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
|
|
if (nfsd4_not_cached(resp)) {
|
|
slot->sl_datalen = 0;
|
|
return;
|
|
}
|
|
base = resp->cstate.data_offset;
|
|
slot->sl_datalen = buf->len - base;
|
|
if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
|
|
WARN(1, "%s: sessions DRC could not cache compound\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Encode the replay sequence operation from the slot values.
|
|
* If cachethis is FALSE encode the uncached rep error on the next
|
|
* operation which sets resp->p and increments resp->opcnt for
|
|
* nfs4svc_encode_compoundres.
|
|
*
|
|
*/
|
|
static __be32
|
|
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
|
|
struct nfsd4_compoundres *resp)
|
|
{
|
|
struct nfsd4_op *op;
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
|
|
/* Encode the replayed sequence operation */
|
|
op = &args->ops[resp->opcnt - 1];
|
|
nfsd4_encode_operation(resp, op);
|
|
|
|
/* Return nfserr_retry_uncached_rep in next operation. */
|
|
if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
|
|
op = &args->ops[resp->opcnt++];
|
|
op->status = nfserr_retry_uncached_rep;
|
|
nfsd4_encode_operation(resp, op);
|
|
}
|
|
return op->status;
|
|
}
|
|
|
|
/*
|
|
* The sequence operation is not cached because we can use the slot and
|
|
* session values.
|
|
*/
|
|
static __be32
|
|
nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
|
|
struct nfsd4_sequence *seq)
|
|
{
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
struct xdr_stream *xdr = &resp->xdr;
|
|
__be32 *p;
|
|
__be32 status;
|
|
|
|
dprintk("--> %s slot %p\n", __func__, slot);
|
|
|
|
status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
|
|
if (status)
|
|
return status;
|
|
|
|
p = xdr_reserve_space(xdr, slot->sl_datalen);
|
|
if (!p) {
|
|
WARN_ON_ONCE(1);
|
|
return nfserr_serverfault;
|
|
}
|
|
xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
|
|
xdr_commit_encode(xdr);
|
|
|
|
resp->opcnt = slot->sl_opcnt;
|
|
return slot->sl_status;
|
|
}
|
|
|
|
/*
|
|
* Set the exchange_id flags returned by the server.
|
|
*/
|
|
static void
|
|
nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
|
|
{
|
|
#ifdef CONFIG_NFSD_PNFS
|
|
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
|
|
#else
|
|
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
|
|
#endif
|
|
|
|
/* Referrals are supported, Migration is not. */
|
|
new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
|
|
|
|
/* set the wire flags to return to client. */
|
|
clid->flags = new->cl_exchange_flags;
|
|
}
|
|
|
|
static bool client_has_openowners(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_openowner *oo;
|
|
|
|
list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
|
|
if (!list_empty(&oo->oo_owner.so_stateids))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool client_has_state(struct nfs4_client *clp)
|
|
{
|
|
return client_has_openowners(clp)
|
|
#ifdef CONFIG_NFSD_PNFS
|
|
|| !list_empty(&clp->cl_lo_states)
|
|
#endif
|
|
|| !list_empty(&clp->cl_delegations)
|
|
|| !list_empty(&clp->cl_sessions);
|
|
}
|
|
|
|
__be32
|
|
nfsd4_exchange_id(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_exchange_id *exid)
|
|
{
|
|
struct nfs4_client *conf, *new;
|
|
struct nfs4_client *unconf = NULL;
|
|
__be32 status;
|
|
char addr_str[INET6_ADDRSTRLEN];
|
|
nfs4_verifier verf = exid->verifier;
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
rpc_ntop(sa, addr_str, sizeof(addr_str));
|
|
dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
|
|
"ip_addr=%s flags %x, spa_how %d\n",
|
|
__func__, rqstp, exid, exid->clname.len, exid->clname.data,
|
|
addr_str, exid->flags, exid->spa_how);
|
|
|
|
if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
|
|
return nfserr_inval;
|
|
|
|
new = create_client(exid->clname, rqstp, &verf);
|
|
if (new == NULL)
|
|
return nfserr_jukebox;
|
|
|
|
switch (exid->spa_how) {
|
|
case SP4_MACH_CRED:
|
|
if (!svc_rqst_integrity_protected(rqstp)) {
|
|
status = nfserr_inval;
|
|
goto out_nolock;
|
|
}
|
|
/*
|
|
* Sometimes userspace doesn't give us a principal.
|
|
* Which is a bug, really. Anyway, we can't enforce
|
|
* MACH_CRED in that case, better to give up now:
|
|
*/
|
|
if (!new->cl_cred.cr_principal &&
|
|
!new->cl_cred.cr_raw_principal) {
|
|
status = nfserr_serverfault;
|
|
goto out_nolock;
|
|
}
|
|
new->cl_mach_cred = true;
|
|
case SP4_NONE:
|
|
break;
|
|
default: /* checked by xdr code */
|
|
WARN_ON_ONCE(1);
|
|
case SP4_SSV:
|
|
status = nfserr_encr_alg_unsupp;
|
|
goto out_nolock;
|
|
}
|
|
|
|
/* Cases below refer to rfc 5661 section 18.35.4: */
|
|
spin_lock(&nn->client_lock);
|
|
conf = find_confirmed_client_by_name(&exid->clname, nn);
|
|
if (conf) {
|
|
bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
|
|
bool verfs_match = same_verf(&verf, &conf->cl_verifier);
|
|
|
|
if (update) {
|
|
if (!clp_used_exchangeid(conf)) { /* buggy client */
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
if (!mach_creds_match(conf, rqstp)) {
|
|
status = nfserr_wrong_cred;
|
|
goto out;
|
|
}
|
|
if (!creds_match) { /* case 9 */
|
|
status = nfserr_perm;
|
|
goto out;
|
|
}
|
|
if (!verfs_match) { /* case 8 */
|
|
status = nfserr_not_same;
|
|
goto out;
|
|
}
|
|
/* case 6 */
|
|
exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
|
|
goto out_copy;
|
|
}
|
|
if (!creds_match) { /* case 3 */
|
|
if (client_has_state(conf)) {
|
|
status = nfserr_clid_inuse;
|
|
goto out;
|
|
}
|
|
goto out_new;
|
|
}
|
|
if (verfs_match) { /* case 2 */
|
|
conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
|
|
goto out_copy;
|
|
}
|
|
/* case 5, client reboot */
|
|
conf = NULL;
|
|
goto out_new;
|
|
}
|
|
|
|
if (update) { /* case 7 */
|
|
status = nfserr_noent;
|
|
goto out;
|
|
}
|
|
|
|
unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
|
|
if (unconf) /* case 4, possible retry or client restart */
|
|
unhash_client_locked(unconf);
|
|
|
|
/* case 1 (normal case) */
|
|
out_new:
|
|
if (conf) {
|
|
status = mark_client_expired_locked(conf);
|
|
if (status)
|
|
goto out;
|
|
}
|
|
new->cl_minorversion = cstate->minorversion;
|
|
|
|
gen_clid(new, nn);
|
|
add_to_unconfirmed(new);
|
|
swap(new, conf);
|
|
out_copy:
|
|
exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
|
|
exid->clientid.cl_id = conf->cl_clientid.cl_id;
|
|
|
|
exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
|
|
nfsd4_set_ex_flags(conf, exid);
|
|
|
|
dprintk("nfsd4_exchange_id seqid %d flags %x\n",
|
|
conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
|
|
status = nfs_ok;
|
|
|
|
out:
|
|
spin_unlock(&nn->client_lock);
|
|
out_nolock:
|
|
if (new)
|
|
expire_client(new);
|
|
if (unconf)
|
|
expire_client(unconf);
|
|
return status;
|
|
}
|
|
|
|
static __be32
|
|
check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
|
|
{
|
|
dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
|
|
slot_seqid);
|
|
|
|
/* The slot is in use, and no response has been sent. */
|
|
if (slot_inuse) {
|
|
if (seqid == slot_seqid)
|
|
return nfserr_jukebox;
|
|
else
|
|
return nfserr_seq_misordered;
|
|
}
|
|
/* Note unsigned 32-bit arithmetic handles wraparound: */
|
|
if (likely(seqid == slot_seqid + 1))
|
|
return nfs_ok;
|
|
if (seqid == slot_seqid)
|
|
return nfserr_replay_cache;
|
|
return nfserr_seq_misordered;
|
|
}
|
|
|
|
/*
|
|
* Cache the create session result into the create session single DRC
|
|
* slot cache by saving the xdr structure. sl_seqid has been set.
|
|
* Do this for solo or embedded create session operations.
|
|
*/
|
|
static void
|
|
nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
|
|
struct nfsd4_clid_slot *slot, __be32 nfserr)
|
|
{
|
|
slot->sl_status = nfserr;
|
|
memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
|
|
}
|
|
|
|
static __be32
|
|
nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
|
|
struct nfsd4_clid_slot *slot)
|
|
{
|
|
memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
|
|
return slot->sl_status;
|
|
}
|
|
|
|
#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
|
|
2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
|
|
1 + /* MIN tag is length with zero, only length */ \
|
|
3 + /* version, opcount, opcode */ \
|
|
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
|
|
/* seqid, slotID, slotID, cache */ \
|
|
4 ) * sizeof(__be32))
|
|
|
|
#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
|
|
2 + /* verifier: AUTH_NULL, length 0 */\
|
|
1 + /* status */ \
|
|
1 + /* MIN tag is length with zero, only length */ \
|
|
3 + /* opcount, opcode, opstatus*/ \
|
|
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
|
|
/* seqid, slotID, slotID, slotID, status */ \
|
|
5 ) * sizeof(__be32))
|
|
|
|
static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
|
|
{
|
|
u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
|
|
|
|
if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
|
|
return nfserr_toosmall;
|
|
if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
|
|
return nfserr_toosmall;
|
|
ca->headerpadsz = 0;
|
|
ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
|
|
ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
|
|
ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
|
|
ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
|
|
NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
|
|
ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
|
|
/*
|
|
* Note decreasing slot size below client's request may make it
|
|
* difficult for client to function correctly, whereas
|
|
* decreasing the number of slots will (just?) affect
|
|
* performance. When short on memory we therefore prefer to
|
|
* decrease number of slots instead of their size. Clients that
|
|
* request larger slots than they need will get poor results:
|
|
*/
|
|
ca->maxreqs = nfsd4_get_drc_mem(ca);
|
|
if (!ca->maxreqs)
|
|
return nfserr_jukebox;
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
/*
|
|
* Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
|
|
* These are based on similar macros in linux/sunrpc/msg_prot.h .
|
|
*/
|
|
#define RPC_MAX_HEADER_WITH_AUTH_SYS \
|
|
(RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
|
|
|
|
#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
|
|
(RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
|
|
|
|
#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
|
|
RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
|
|
#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
|
|
RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
|
|
sizeof(__be32))
|
|
|
|
static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
|
|
{
|
|
ca->headerpadsz = 0;
|
|
|
|
if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
|
|
return nfserr_toosmall;
|
|
if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
|
|
return nfserr_toosmall;
|
|
ca->maxresp_cached = 0;
|
|
if (ca->maxops < 2)
|
|
return nfserr_toosmall;
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
|
|
{
|
|
switch (cbs->flavor) {
|
|
case RPC_AUTH_NULL:
|
|
case RPC_AUTH_UNIX:
|
|
return nfs_ok;
|
|
default:
|
|
/*
|
|
* GSS case: the spec doesn't allow us to return this
|
|
* error. But it also doesn't allow us not to support
|
|
* GSS.
|
|
* I'd rather this fail hard than return some error the
|
|
* client might think it can already handle:
|
|
*/
|
|
return nfserr_encr_alg_unsupp;
|
|
}
|
|
}
|
|
|
|
__be32
|
|
nfsd4_create_session(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_create_session *cr_ses)
|
|
{
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
struct nfs4_client *conf, *unconf;
|
|
struct nfs4_client *old = NULL;
|
|
struct nfsd4_session *new;
|
|
struct nfsd4_conn *conn;
|
|
struct nfsd4_clid_slot *cs_slot = NULL;
|
|
__be32 status = 0;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
|
|
return nfserr_inval;
|
|
status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
|
|
if (status)
|
|
return status;
|
|
status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
|
|
if (status)
|
|
return status;
|
|
status = check_backchannel_attrs(&cr_ses->back_channel);
|
|
if (status)
|
|
goto out_release_drc_mem;
|
|
status = nfserr_jukebox;
|
|
new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
|
|
if (!new)
|
|
goto out_release_drc_mem;
|
|
conn = alloc_conn_from_crses(rqstp, cr_ses);
|
|
if (!conn)
|
|
goto out_free_session;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
|
|
conf = find_confirmed_client(&cr_ses->clientid, true, nn);
|
|
WARN_ON_ONCE(conf && unconf);
|
|
|
|
if (conf) {
|
|
status = nfserr_wrong_cred;
|
|
if (!mach_creds_match(conf, rqstp))
|
|
goto out_free_conn;
|
|
cs_slot = &conf->cl_cs_slot;
|
|
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
|
|
if (status) {
|
|
if (status == nfserr_replay_cache)
|
|
status = nfsd4_replay_create_session(cr_ses, cs_slot);
|
|
goto out_free_conn;
|
|
}
|
|
} else if (unconf) {
|
|
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
|
|
!rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
|
|
status = nfserr_clid_inuse;
|
|
goto out_free_conn;
|
|
}
|
|
status = nfserr_wrong_cred;
|
|
if (!mach_creds_match(unconf, rqstp))
|
|
goto out_free_conn;
|
|
cs_slot = &unconf->cl_cs_slot;
|
|
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
|
|
if (status) {
|
|
/* an unconfirmed replay returns misordered */
|
|
status = nfserr_seq_misordered;
|
|
goto out_free_conn;
|
|
}
|
|
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
|
|
if (old) {
|
|
status = mark_client_expired_locked(old);
|
|
if (status) {
|
|
old = NULL;
|
|
goto out_free_conn;
|
|
}
|
|
}
|
|
move_to_confirmed(unconf);
|
|
conf = unconf;
|
|
} else {
|
|
status = nfserr_stale_clientid;
|
|
goto out_free_conn;
|
|
}
|
|
status = nfs_ok;
|
|
/* Persistent sessions are not supported */
|
|
cr_ses->flags &= ~SESSION4_PERSIST;
|
|
/* Upshifting from TCP to RDMA is not supported */
|
|
cr_ses->flags &= ~SESSION4_RDMA;
|
|
|
|
init_session(rqstp, new, conf, cr_ses);
|
|
nfsd4_get_session_locked(new);
|
|
|
|
memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
|
|
NFS4_MAX_SESSIONID_LEN);
|
|
cs_slot->sl_seqid++;
|
|
cr_ses->seqid = cs_slot->sl_seqid;
|
|
|
|
/* cache solo and embedded create sessions under the client_lock */
|
|
nfsd4_cache_create_session(cr_ses, cs_slot, status);
|
|
spin_unlock(&nn->client_lock);
|
|
/* init connection and backchannel */
|
|
nfsd4_init_conn(rqstp, conn, new);
|
|
nfsd4_put_session(new);
|
|
if (old)
|
|
expire_client(old);
|
|
return status;
|
|
out_free_conn:
|
|
spin_unlock(&nn->client_lock);
|
|
free_conn(conn);
|
|
if (old)
|
|
expire_client(old);
|
|
out_free_session:
|
|
__free_session(new);
|
|
out_release_drc_mem:
|
|
nfsd4_put_drc_mem(&cr_ses->fore_channel);
|
|
return status;
|
|
}
|
|
|
|
static __be32 nfsd4_map_bcts_dir(u32 *dir)
|
|
{
|
|
switch (*dir) {
|
|
case NFS4_CDFC4_FORE:
|
|
case NFS4_CDFC4_BACK:
|
|
return nfs_ok;
|
|
case NFS4_CDFC4_FORE_OR_BOTH:
|
|
case NFS4_CDFC4_BACK_OR_BOTH:
|
|
*dir = NFS4_CDFC4_BOTH;
|
|
return nfs_ok;
|
|
};
|
|
return nfserr_inval;
|
|
}
|
|
|
|
__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
|
|
{
|
|
struct nfsd4_session *session = cstate->session;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
__be32 status;
|
|
|
|
status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
|
|
if (status)
|
|
return status;
|
|
spin_lock(&nn->client_lock);
|
|
session->se_cb_prog = bc->bc_cb_program;
|
|
session->se_cb_sec = bc->bc_cb_sec;
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
nfsd4_probe_callback(session->se_client);
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_bind_conn_to_session *bcts)
|
|
{
|
|
__be32 status;
|
|
struct nfsd4_conn *conn;
|
|
struct nfsd4_session *session;
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (!nfsd4_last_compound_op(rqstp))
|
|
return nfserr_not_only_op;
|
|
spin_lock(&nn->client_lock);
|
|
session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
|
|
spin_unlock(&nn->client_lock);
|
|
if (!session)
|
|
goto out_no_session;
|
|
status = nfserr_wrong_cred;
|
|
if (!mach_creds_match(session->se_client, rqstp))
|
|
goto out;
|
|
status = nfsd4_map_bcts_dir(&bcts->dir);
|
|
if (status)
|
|
goto out;
|
|
conn = alloc_conn(rqstp, bcts->dir);
|
|
status = nfserr_jukebox;
|
|
if (!conn)
|
|
goto out;
|
|
nfsd4_init_conn(rqstp, conn, session);
|
|
status = nfs_ok;
|
|
out:
|
|
nfsd4_put_session(session);
|
|
out_no_session:
|
|
return status;
|
|
}
|
|
|
|
static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
|
|
{
|
|
if (!session)
|
|
return 0;
|
|
return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
|
|
}
|
|
|
|
__be32
|
|
nfsd4_destroy_session(struct svc_rqst *r,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_destroy_session *sessionid)
|
|
{
|
|
struct nfsd4_session *ses;
|
|
__be32 status;
|
|
int ref_held_by_me = 0;
|
|
struct net *net = SVC_NET(r);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
status = nfserr_not_only_op;
|
|
if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
|
|
if (!nfsd4_last_compound_op(r))
|
|
goto out;
|
|
ref_held_by_me++;
|
|
}
|
|
dump_sessionid(__func__, &sessionid->sessionid);
|
|
spin_lock(&nn->client_lock);
|
|
ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
|
|
if (!ses)
|
|
goto out_client_lock;
|
|
status = nfserr_wrong_cred;
|
|
if (!mach_creds_match(ses->se_client, r))
|
|
goto out_put_session;
|
|
status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
|
|
if (status)
|
|
goto out_put_session;
|
|
unhash_session(ses);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
nfsd4_probe_callback_sync(ses->se_client);
|
|
|
|
spin_lock(&nn->client_lock);
|
|
status = nfs_ok;
|
|
out_put_session:
|
|
nfsd4_put_session_locked(ses);
|
|
out_client_lock:
|
|
spin_unlock(&nn->client_lock);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
|
|
{
|
|
struct nfsd4_conn *c;
|
|
|
|
list_for_each_entry(c, &s->se_conns, cn_persession) {
|
|
if (c->cn_xprt == xpt) {
|
|
return c;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
|
|
{
|
|
struct nfs4_client *clp = ses->se_client;
|
|
struct nfsd4_conn *c;
|
|
__be32 status = nfs_ok;
|
|
int ret;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
c = __nfsd4_find_conn(new->cn_xprt, ses);
|
|
if (c)
|
|
goto out_free;
|
|
status = nfserr_conn_not_bound_to_session;
|
|
if (clp->cl_mach_cred)
|
|
goto out_free;
|
|
__nfsd4_hash_conn(new, ses);
|
|
spin_unlock(&clp->cl_lock);
|
|
ret = nfsd4_register_conn(new);
|
|
if (ret)
|
|
/* oops; xprt is already down: */
|
|
nfsd4_conn_lost(&new->cn_xpt_user);
|
|
return nfs_ok;
|
|
out_free:
|
|
spin_unlock(&clp->cl_lock);
|
|
free_conn(new);
|
|
return status;
|
|
}
|
|
|
|
static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
|
|
{
|
|
struct nfsd4_compoundargs *args = rqstp->rq_argp;
|
|
|
|
return args->opcnt > session->se_fchannel.maxops;
|
|
}
|
|
|
|
static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
|
|
struct nfsd4_session *session)
|
|
{
|
|
struct xdr_buf *xb = &rqstp->rq_arg;
|
|
|
|
return xb->len > session->se_fchannel.maxreq_sz;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_sequence(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_sequence *seq)
|
|
{
|
|
struct nfsd4_compoundres *resp = rqstp->rq_resp;
|
|
struct xdr_stream *xdr = &resp->xdr;
|
|
struct nfsd4_session *session;
|
|
struct nfs4_client *clp;
|
|
struct nfsd4_slot *slot;
|
|
struct nfsd4_conn *conn;
|
|
__be32 status;
|
|
int buflen;
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (resp->opcnt != 1)
|
|
return nfserr_sequence_pos;
|
|
|
|
/*
|
|
* Will be either used or freed by nfsd4_sequence_check_conn
|
|
* below.
|
|
*/
|
|
conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
|
|
if (!conn)
|
|
return nfserr_jukebox;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
|
|
if (!session)
|
|
goto out_no_session;
|
|
clp = session->se_client;
|
|
|
|
status = nfserr_too_many_ops;
|
|
if (nfsd4_session_too_many_ops(rqstp, session))
|
|
goto out_put_session;
|
|
|
|
status = nfserr_req_too_big;
|
|
if (nfsd4_request_too_big(rqstp, session))
|
|
goto out_put_session;
|
|
|
|
status = nfserr_badslot;
|
|
if (seq->slotid >= session->se_fchannel.maxreqs)
|
|
goto out_put_session;
|
|
|
|
slot = session->se_slots[seq->slotid];
|
|
dprintk("%s: slotid %d\n", __func__, seq->slotid);
|
|
|
|
/* We do not negotiate the number of slots yet, so set the
|
|
* maxslots to the session maxreqs which is used to encode
|
|
* sr_highest_slotid and the sr_target_slot id to maxslots */
|
|
seq->maxslots = session->se_fchannel.maxreqs;
|
|
|
|
status = check_slot_seqid(seq->seqid, slot->sl_seqid,
|
|
slot->sl_flags & NFSD4_SLOT_INUSE);
|
|
if (status == nfserr_replay_cache) {
|
|
status = nfserr_seq_misordered;
|
|
if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
|
|
goto out_put_session;
|
|
cstate->slot = slot;
|
|
cstate->session = session;
|
|
cstate->clp = clp;
|
|
/* Return the cached reply status and set cstate->status
|
|
* for nfsd4_proc_compound processing */
|
|
status = nfsd4_replay_cache_entry(resp, seq);
|
|
cstate->status = nfserr_replay_cache;
|
|
goto out;
|
|
}
|
|
if (status)
|
|
goto out_put_session;
|
|
|
|
status = nfsd4_sequence_check_conn(conn, session);
|
|
conn = NULL;
|
|
if (status)
|
|
goto out_put_session;
|
|
|
|
buflen = (seq->cachethis) ?
|
|
session->se_fchannel.maxresp_cached :
|
|
session->se_fchannel.maxresp_sz;
|
|
status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
|
|
nfserr_rep_too_big;
|
|
if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
|
|
goto out_put_session;
|
|
svc_reserve(rqstp, buflen);
|
|
|
|
status = nfs_ok;
|
|
/* Success! bump slot seqid */
|
|
slot->sl_seqid = seq->seqid;
|
|
slot->sl_flags |= NFSD4_SLOT_INUSE;
|
|
if (seq->cachethis)
|
|
slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
|
|
else
|
|
slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
|
|
|
|
cstate->slot = slot;
|
|
cstate->session = session;
|
|
cstate->clp = clp;
|
|
|
|
out:
|
|
switch (clp->cl_cb_state) {
|
|
case NFSD4_CB_DOWN:
|
|
seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
|
|
break;
|
|
case NFSD4_CB_FAULT:
|
|
seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
|
|
break;
|
|
default:
|
|
seq->status_flags = 0;
|
|
}
|
|
if (!list_empty(&clp->cl_revoked))
|
|
seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
|
|
out_no_session:
|
|
if (conn)
|
|
free_conn(conn);
|
|
spin_unlock(&nn->client_lock);
|
|
return status;
|
|
out_put_session:
|
|
nfsd4_put_session_locked(session);
|
|
goto out_no_session;
|
|
}
|
|
|
|
void
|
|
nfsd4_sequence_done(struct nfsd4_compoundres *resp)
|
|
{
|
|
struct nfsd4_compound_state *cs = &resp->cstate;
|
|
|
|
if (nfsd4_has_session(cs)) {
|
|
if (cs->status != nfserr_replay_cache) {
|
|
nfsd4_store_cache_entry(resp);
|
|
cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
|
|
}
|
|
/* Drop session reference that was taken in nfsd4_sequence() */
|
|
nfsd4_put_session(cs->session);
|
|
} else if (cs->clp)
|
|
put_client_renew(cs->clp);
|
|
}
|
|
|
|
__be32
|
|
nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
|
|
{
|
|
struct nfs4_client *conf, *unconf;
|
|
struct nfs4_client *clp = NULL;
|
|
__be32 status = 0;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
spin_lock(&nn->client_lock);
|
|
unconf = find_unconfirmed_client(&dc->clientid, true, nn);
|
|
conf = find_confirmed_client(&dc->clientid, true, nn);
|
|
WARN_ON_ONCE(conf && unconf);
|
|
|
|
if (conf) {
|
|
if (client_has_state(conf)) {
|
|
status = nfserr_clientid_busy;
|
|
goto out;
|
|
}
|
|
status = mark_client_expired_locked(conf);
|
|
if (status)
|
|
goto out;
|
|
clp = conf;
|
|
} else if (unconf)
|
|
clp = unconf;
|
|
else {
|
|
status = nfserr_stale_clientid;
|
|
goto out;
|
|
}
|
|
if (!mach_creds_match(clp, rqstp)) {
|
|
clp = NULL;
|
|
status = nfserr_wrong_cred;
|
|
goto out;
|
|
}
|
|
unhash_client_locked(clp);
|
|
out:
|
|
spin_unlock(&nn->client_lock);
|
|
if (clp)
|
|
expire_client(clp);
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
|
|
{
|
|
__be32 status = 0;
|
|
|
|
if (rc->rca_one_fs) {
|
|
if (!cstate->current_fh.fh_dentry)
|
|
return nfserr_nofilehandle;
|
|
/*
|
|
* We don't take advantage of the rca_one_fs case.
|
|
* That's OK, it's optional, we can safely ignore it.
|
|
*/
|
|
return nfs_ok;
|
|
}
|
|
|
|
status = nfserr_complete_already;
|
|
if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
|
|
&cstate->session->se_client->cl_flags))
|
|
goto out;
|
|
|
|
status = nfserr_stale_clientid;
|
|
if (is_client_expired(cstate->session->se_client))
|
|
/*
|
|
* The following error isn't really legal.
|
|
* But we only get here if the client just explicitly
|
|
* destroyed the client. Surely it no longer cares what
|
|
* error it gets back on an operation for the dead
|
|
* client.
|
|
*/
|
|
goto out;
|
|
|
|
status = nfs_ok;
|
|
nfsd4_client_record_create(cstate->session->se_client);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_setclientid *setclid)
|
|
{
|
|
struct xdr_netobj clname = setclid->se_name;
|
|
nfs4_verifier clverifier = setclid->se_verf;
|
|
struct nfs4_client *conf, *new;
|
|
struct nfs4_client *unconf = NULL;
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
new = create_client(clname, rqstp, &clverifier);
|
|
if (new == NULL)
|
|
return nfserr_jukebox;
|
|
/* Cases below refer to rfc 3530 section 14.2.33: */
|
|
spin_lock(&nn->client_lock);
|
|
conf = find_confirmed_client_by_name(&clname, nn);
|
|
if (conf && client_has_state(conf)) {
|
|
/* case 0: */
|
|
status = nfserr_clid_inuse;
|
|
if (clp_used_exchangeid(conf))
|
|
goto out;
|
|
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
|
|
char addr_str[INET6_ADDRSTRLEN];
|
|
rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
|
|
sizeof(addr_str));
|
|
dprintk("NFSD: setclientid: string in use by client "
|
|
"at %s\n", addr_str);
|
|
goto out;
|
|
}
|
|
}
|
|
unconf = find_unconfirmed_client_by_name(&clname, nn);
|
|
if (unconf)
|
|
unhash_client_locked(unconf);
|
|
if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
|
|
/* case 1: probable callback update */
|
|
copy_clid(new, conf);
|
|
gen_confirm(new, nn);
|
|
} else /* case 4 (new client) or cases 2, 3 (client reboot): */
|
|
gen_clid(new, nn);
|
|
new->cl_minorversion = 0;
|
|
gen_callback(new, setclid, rqstp);
|
|
add_to_unconfirmed(new);
|
|
setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
|
|
setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
|
|
memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
|
|
new = NULL;
|
|
status = nfs_ok;
|
|
out:
|
|
spin_unlock(&nn->client_lock);
|
|
if (new)
|
|
free_client(new);
|
|
if (unconf)
|
|
expire_client(unconf);
|
|
return status;
|
|
}
|
|
|
|
|
|
__be32
|
|
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_setclientid_confirm *setclientid_confirm)
|
|
{
|
|
struct nfs4_client *conf, *unconf;
|
|
struct nfs4_client *old = NULL;
|
|
nfs4_verifier confirm = setclientid_confirm->sc_confirm;
|
|
clientid_t * clid = &setclientid_confirm->sc_clientid;
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
if (STALE_CLIENTID(clid, nn))
|
|
return nfserr_stale_clientid;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
conf = find_confirmed_client(clid, false, nn);
|
|
unconf = find_unconfirmed_client(clid, false, nn);
|
|
/*
|
|
* We try hard to give out unique clientid's, so if we get an
|
|
* attempt to confirm the same clientid with a different cred,
|
|
* the client may be buggy; this should never happen.
|
|
*
|
|
* Nevertheless, RFC 7530 recommends INUSE for this case:
|
|
*/
|
|
status = nfserr_clid_inuse;
|
|
if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
|
|
goto out;
|
|
if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
|
|
goto out;
|
|
/* cases below refer to rfc 3530 section 14.2.34: */
|
|
if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
|
|
if (conf && !unconf) /* case 2: probable retransmit */
|
|
status = nfs_ok;
|
|
else /* case 4: client hasn't noticed we rebooted yet? */
|
|
status = nfserr_stale_clientid;
|
|
goto out;
|
|
}
|
|
status = nfs_ok;
|
|
if (conf) { /* case 1: callback update */
|
|
old = unconf;
|
|
unhash_client_locked(old);
|
|
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
|
|
} else { /* case 3: normal case; new or rebooted client */
|
|
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
|
|
if (old) {
|
|
status = nfserr_clid_inuse;
|
|
if (client_has_state(old)
|
|
&& !same_creds(&unconf->cl_cred,
|
|
&old->cl_cred))
|
|
goto out;
|
|
status = mark_client_expired_locked(old);
|
|
if (status) {
|
|
old = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
move_to_confirmed(unconf);
|
|
conf = unconf;
|
|
}
|
|
get_client_locked(conf);
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd4_probe_callback(conf);
|
|
spin_lock(&nn->client_lock);
|
|
put_client_renew_locked(conf);
|
|
out:
|
|
spin_unlock(&nn->client_lock);
|
|
if (old)
|
|
expire_client(old);
|
|
return status;
|
|
}
|
|
|
|
static struct nfs4_file *nfsd4_alloc_file(void)
|
|
{
|
|
return kmem_cache_alloc(file_slab, GFP_KERNEL);
|
|
}
|
|
|
|
/* OPEN Share state helper functions */
|
|
static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
|
|
struct nfs4_file *fp)
|
|
{
|
|
lockdep_assert_held(&state_lock);
|
|
|
|
atomic_set(&fp->fi_ref, 1);
|
|
spin_lock_init(&fp->fi_lock);
|
|
INIT_LIST_HEAD(&fp->fi_stateids);
|
|
INIT_LIST_HEAD(&fp->fi_delegations);
|
|
INIT_LIST_HEAD(&fp->fi_clnt_odstate);
|
|
fh_copy_shallow(&fp->fi_fhandle, fh);
|
|
fp->fi_deleg_file = NULL;
|
|
fp->fi_had_conflict = false;
|
|
fp->fi_share_deny = 0;
|
|
memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
|
|
memset(fp->fi_access, 0, sizeof(fp->fi_access));
|
|
#ifdef CONFIG_NFSD_PNFS
|
|
INIT_LIST_HEAD(&fp->fi_lo_states);
|
|
atomic_set(&fp->fi_lo_recalls, 0);
|
|
#endif
|
|
hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
|
|
}
|
|
|
|
void
|
|
nfsd4_free_slabs(void)
|
|
{
|
|
kmem_cache_destroy(odstate_slab);
|
|
kmem_cache_destroy(openowner_slab);
|
|
kmem_cache_destroy(lockowner_slab);
|
|
kmem_cache_destroy(file_slab);
|
|
kmem_cache_destroy(stateid_slab);
|
|
kmem_cache_destroy(deleg_slab);
|
|
}
|
|
|
|
int
|
|
nfsd4_init_slabs(void)
|
|
{
|
|
openowner_slab = kmem_cache_create("nfsd4_openowners",
|
|
sizeof(struct nfs4_openowner), 0, 0, NULL);
|
|
if (openowner_slab == NULL)
|
|
goto out;
|
|
lockowner_slab = kmem_cache_create("nfsd4_lockowners",
|
|
sizeof(struct nfs4_lockowner), 0, 0, NULL);
|
|
if (lockowner_slab == NULL)
|
|
goto out_free_openowner_slab;
|
|
file_slab = kmem_cache_create("nfsd4_files",
|
|
sizeof(struct nfs4_file), 0, 0, NULL);
|
|
if (file_slab == NULL)
|
|
goto out_free_lockowner_slab;
|
|
stateid_slab = kmem_cache_create("nfsd4_stateids",
|
|
sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
|
|
if (stateid_slab == NULL)
|
|
goto out_free_file_slab;
|
|
deleg_slab = kmem_cache_create("nfsd4_delegations",
|
|
sizeof(struct nfs4_delegation), 0, 0, NULL);
|
|
if (deleg_slab == NULL)
|
|
goto out_free_stateid_slab;
|
|
odstate_slab = kmem_cache_create("nfsd4_odstate",
|
|
sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
|
|
if (odstate_slab == NULL)
|
|
goto out_free_deleg_slab;
|
|
return 0;
|
|
|
|
out_free_deleg_slab:
|
|
kmem_cache_destroy(deleg_slab);
|
|
out_free_stateid_slab:
|
|
kmem_cache_destroy(stateid_slab);
|
|
out_free_file_slab:
|
|
kmem_cache_destroy(file_slab);
|
|
out_free_lockowner_slab:
|
|
kmem_cache_destroy(lockowner_slab);
|
|
out_free_openowner_slab:
|
|
kmem_cache_destroy(openowner_slab);
|
|
out:
|
|
dprintk("nfsd4: out of memory while initializing nfsv4\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void init_nfs4_replay(struct nfs4_replay *rp)
|
|
{
|
|
rp->rp_status = nfserr_serverfault;
|
|
rp->rp_buflen = 0;
|
|
rp->rp_buf = rp->rp_ibuf;
|
|
mutex_init(&rp->rp_mutex);
|
|
}
|
|
|
|
static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
|
|
struct nfs4_stateowner *so)
|
|
{
|
|
if (!nfsd4_has_session(cstate)) {
|
|
mutex_lock(&so->so_replay.rp_mutex);
|
|
cstate->replay_owner = nfs4_get_stateowner(so);
|
|
}
|
|
}
|
|
|
|
void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
|
|
{
|
|
struct nfs4_stateowner *so = cstate->replay_owner;
|
|
|
|
if (so != NULL) {
|
|
cstate->replay_owner = NULL;
|
|
mutex_unlock(&so->so_replay.rp_mutex);
|
|
nfs4_put_stateowner(so);
|
|
}
|
|
}
|
|
|
|
static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_stateowner *sop;
|
|
|
|
sop = kmem_cache_alloc(slab, GFP_KERNEL);
|
|
if (!sop)
|
|
return NULL;
|
|
|
|
sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
|
|
if (!sop->so_owner.data) {
|
|
kmem_cache_free(slab, sop);
|
|
return NULL;
|
|
}
|
|
sop->so_owner.len = owner->len;
|
|
|
|
INIT_LIST_HEAD(&sop->so_stateids);
|
|
sop->so_client = clp;
|
|
init_nfs4_replay(&sop->so_replay);
|
|
atomic_set(&sop->so_count, 1);
|
|
return sop;
|
|
}
|
|
|
|
static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
|
|
{
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
list_add(&oo->oo_owner.so_strhash,
|
|
&clp->cl_ownerstr_hashtbl[strhashval]);
|
|
list_add(&oo->oo_perclient, &clp->cl_openowners);
|
|
}
|
|
|
|
static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
|
|
{
|
|
unhash_openowner_locked(openowner(so));
|
|
}
|
|
|
|
static void nfs4_free_openowner(struct nfs4_stateowner *so)
|
|
{
|
|
struct nfs4_openowner *oo = openowner(so);
|
|
|
|
kmem_cache_free(openowner_slab, oo);
|
|
}
|
|
|
|
static const struct nfs4_stateowner_operations openowner_ops = {
|
|
.so_unhash = nfs4_unhash_openowner,
|
|
.so_free = nfs4_free_openowner,
|
|
};
|
|
|
|
static struct nfs4_ol_stateid *
|
|
nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
|
|
{
|
|
struct nfs4_ol_stateid *local, *ret = NULL;
|
|
struct nfs4_openowner *oo = open->op_openowner;
|
|
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
|
|
list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
|
|
/* ignore lock owners */
|
|
if (local->st_stateowner->so_is_open_owner == 0)
|
|
continue;
|
|
if (local->st_stateowner == &oo->oo_owner) {
|
|
ret = local;
|
|
atomic_inc(&ret->st_stid.sc_count);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static struct nfs4_openowner *
|
|
alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
|
|
struct nfsd4_compound_state *cstate)
|
|
{
|
|
struct nfs4_client *clp = cstate->clp;
|
|
struct nfs4_openowner *oo, *ret;
|
|
|
|
oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
|
|
if (!oo)
|
|
return NULL;
|
|
oo->oo_owner.so_ops = &openowner_ops;
|
|
oo->oo_owner.so_is_open_owner = 1;
|
|
oo->oo_owner.so_seqid = open->op_seqid;
|
|
oo->oo_flags = 0;
|
|
if (nfsd4_has_session(cstate))
|
|
oo->oo_flags |= NFS4_OO_CONFIRMED;
|
|
oo->oo_time = 0;
|
|
oo->oo_last_closed_stid = NULL;
|
|
INIT_LIST_HEAD(&oo->oo_close_lru);
|
|
spin_lock(&clp->cl_lock);
|
|
ret = find_openstateowner_str_locked(strhashval, open, clp);
|
|
if (ret == NULL) {
|
|
hash_openowner(oo, clp, strhashval);
|
|
ret = oo;
|
|
} else
|
|
nfs4_free_stateowner(&oo->oo_owner);
|
|
|
|
spin_unlock(&clp->cl_lock);
|
|
return ret;
|
|
}
|
|
|
|
static struct nfs4_ol_stateid *
|
|
init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
|
|
struct nfsd4_open *open)
|
|
{
|
|
|
|
struct nfs4_openowner *oo = open->op_openowner;
|
|
struct nfs4_ol_stateid *retstp = NULL;
|
|
|
|
spin_lock(&oo->oo_owner.so_client->cl_lock);
|
|
spin_lock(&fp->fi_lock);
|
|
|
|
retstp = nfsd4_find_existing_open(fp, open);
|
|
if (retstp)
|
|
goto out_unlock;
|
|
atomic_inc(&stp->st_stid.sc_count);
|
|
stp->st_stid.sc_type = NFS4_OPEN_STID;
|
|
INIT_LIST_HEAD(&stp->st_locks);
|
|
stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
|
|
get_nfs4_file(fp);
|
|
stp->st_stid.sc_file = fp;
|
|
stp->st_access_bmap = 0;
|
|
stp->st_deny_bmap = 0;
|
|
stp->st_openstp = NULL;
|
|
init_rwsem(&stp->st_rwsem);
|
|
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
|
|
list_add(&stp->st_perfile, &fp->fi_stateids);
|
|
|
|
out_unlock:
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&oo->oo_owner.so_client->cl_lock);
|
|
return retstp;
|
|
}
|
|
|
|
/*
|
|
* In the 4.0 case we need to keep the owners around a little while to handle
|
|
* CLOSE replay. We still do need to release any file access that is held by
|
|
* them before returning however.
|
|
*/
|
|
static void
|
|
move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
|
|
{
|
|
struct nfs4_ol_stateid *last;
|
|
struct nfs4_openowner *oo = openowner(s->st_stateowner);
|
|
struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
|
|
nfsd_net_id);
|
|
|
|
dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
|
|
|
|
/*
|
|
* We know that we hold one reference via nfsd4_close, and another
|
|
* "persistent" reference for the client. If the refcount is higher
|
|
* than 2, then there are still calls in progress that are using this
|
|
* stateid. We can't put the sc_file reference until they are finished.
|
|
* Wait for the refcount to drop to 2. Since it has been unhashed,
|
|
* there should be no danger of the refcount going back up again at
|
|
* this point.
|
|
*/
|
|
wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
|
|
|
|
release_all_access(s);
|
|
if (s->st_stid.sc_file) {
|
|
put_nfs4_file(s->st_stid.sc_file);
|
|
s->st_stid.sc_file = NULL;
|
|
}
|
|
|
|
spin_lock(&nn->client_lock);
|
|
last = oo->oo_last_closed_stid;
|
|
oo->oo_last_closed_stid = s;
|
|
list_move_tail(&oo->oo_close_lru, &nn->close_lru);
|
|
oo->oo_time = get_seconds();
|
|
spin_unlock(&nn->client_lock);
|
|
if (last)
|
|
nfs4_put_stid(&last->st_stid);
|
|
}
|
|
|
|
/* search file_hashtbl[] for file */
|
|
static struct nfs4_file *
|
|
find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
|
|
{
|
|
struct nfs4_file *fp;
|
|
|
|
hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
|
|
if (fh_match(&fp->fi_fhandle, fh)) {
|
|
if (atomic_inc_not_zero(&fp->fi_ref))
|
|
return fp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct nfs4_file *
|
|
find_file(struct knfsd_fh *fh)
|
|
{
|
|
struct nfs4_file *fp;
|
|
unsigned int hashval = file_hashval(fh);
|
|
|
|
rcu_read_lock();
|
|
fp = find_file_locked(fh, hashval);
|
|
rcu_read_unlock();
|
|
return fp;
|
|
}
|
|
|
|
static struct nfs4_file *
|
|
find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
|
|
{
|
|
struct nfs4_file *fp;
|
|
unsigned int hashval = file_hashval(fh);
|
|
|
|
rcu_read_lock();
|
|
fp = find_file_locked(fh, hashval);
|
|
rcu_read_unlock();
|
|
if (fp)
|
|
return fp;
|
|
|
|
spin_lock(&state_lock);
|
|
fp = find_file_locked(fh, hashval);
|
|
if (likely(fp == NULL)) {
|
|
nfsd4_init_file(fh, hashval, new);
|
|
fp = new;
|
|
}
|
|
spin_unlock(&state_lock);
|
|
|
|
return fp;
|
|
}
|
|
|
|
/*
|
|
* Called to check deny when READ with all zero stateid or
|
|
* WRITE with all zero or all one stateid
|
|
*/
|
|
static __be32
|
|
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
|
|
{
|
|
struct nfs4_file *fp;
|
|
__be32 ret = nfs_ok;
|
|
|
|
fp = find_file(¤t_fh->fh_handle);
|
|
if (!fp)
|
|
return ret;
|
|
/* Check for conflicting share reservations */
|
|
spin_lock(&fp->fi_lock);
|
|
if (fp->fi_share_deny & deny_type)
|
|
ret = nfserr_locked;
|
|
spin_unlock(&fp->fi_lock);
|
|
put_nfs4_file(fp);
|
|
return ret;
|
|
}
|
|
|
|
static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
|
|
{
|
|
struct nfs4_delegation *dp = cb_to_delegation(cb);
|
|
struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
|
|
nfsd_net_id);
|
|
|
|
block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
|
|
|
|
/*
|
|
* We can't do this in nfsd_break_deleg_cb because it is
|
|
* already holding inode->i_lock.
|
|
*
|
|
* If the dl_time != 0, then we know that it has already been
|
|
* queued for a lease break. Don't queue it again.
|
|
*/
|
|
spin_lock(&state_lock);
|
|
if (dp->dl_time == 0) {
|
|
dp->dl_time = get_seconds();
|
|
list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
|
|
}
|
|
spin_unlock(&state_lock);
|
|
}
|
|
|
|
static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
|
|
struct rpc_task *task)
|
|
{
|
|
struct nfs4_delegation *dp = cb_to_delegation(cb);
|
|
|
|
if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
|
|
return 1;
|
|
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
return 1;
|
|
case -EBADHANDLE:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
/*
|
|
* Race: client probably got cb_recall before open reply
|
|
* granting delegation.
|
|
*/
|
|
if (dp->dl_retries--) {
|
|
rpc_delay(task, 2 * HZ);
|
|
return 0;
|
|
}
|
|
/*FALLTHRU*/
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
|
|
{
|
|
struct nfs4_delegation *dp = cb_to_delegation(cb);
|
|
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
|
|
static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
|
|
.prepare = nfsd4_cb_recall_prepare,
|
|
.done = nfsd4_cb_recall_done,
|
|
.release = nfsd4_cb_recall_release,
|
|
};
|
|
|
|
static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
|
|
{
|
|
/*
|
|
* We're assuming the state code never drops its reference
|
|
* without first removing the lease. Since we're in this lease
|
|
* callback (and since the lease code is serialized by the kernel
|
|
* lock) we know the server hasn't removed the lease yet, we know
|
|
* it's safe to take a reference.
|
|
*/
|
|
atomic_inc(&dp->dl_stid.sc_count);
|
|
nfsd4_run_cb(&dp->dl_recall);
|
|
}
|
|
|
|
/* Called from break_lease() with i_lock held. */
|
|
static bool
|
|
nfsd_break_deleg_cb(struct file_lock *fl)
|
|
{
|
|
bool ret = false;
|
|
struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
|
|
struct nfs4_delegation *dp;
|
|
|
|
if (!fp) {
|
|
WARN(1, "(%p)->fl_owner NULL\n", fl);
|
|
return ret;
|
|
}
|
|
if (fp->fi_had_conflict) {
|
|
WARN(1, "duplicate break on %p\n", fp);
|
|
return ret;
|
|
}
|
|
/*
|
|
* We don't want the locks code to timeout the lease for us;
|
|
* we'll remove it ourself if a delegation isn't returned
|
|
* in time:
|
|
*/
|
|
fl->fl_break_time = 0;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
fp->fi_had_conflict = true;
|
|
/*
|
|
* If there are no delegations on the list, then return true
|
|
* so that the lease code will go ahead and delete it.
|
|
*/
|
|
if (list_empty(&fp->fi_delegations))
|
|
ret = true;
|
|
else
|
|
list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
|
|
nfsd_break_one_deleg(dp);
|
|
spin_unlock(&fp->fi_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
|
|
struct list_head *dispose)
|
|
{
|
|
if (arg & F_UNLCK)
|
|
return lease_modify(onlist, arg, dispose);
|
|
else
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static const struct lock_manager_operations nfsd_lease_mng_ops = {
|
|
.lm_break = nfsd_break_deleg_cb,
|
|
.lm_change = nfsd_change_deleg_cb,
|
|
};
|
|
|
|
static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
|
|
{
|
|
if (nfsd4_has_session(cstate))
|
|
return nfs_ok;
|
|
if (seqid == so->so_seqid - 1)
|
|
return nfserr_replay_me;
|
|
if (seqid == so->so_seqid)
|
|
return nfs_ok;
|
|
return nfserr_bad_seqid;
|
|
}
|
|
|
|
static __be32 lookup_clientid(clientid_t *clid,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd_net *nn)
|
|
{
|
|
struct nfs4_client *found;
|
|
|
|
if (cstate->clp) {
|
|
found = cstate->clp;
|
|
if (!same_clid(&found->cl_clientid, clid))
|
|
return nfserr_stale_clientid;
|
|
return nfs_ok;
|
|
}
|
|
|
|
if (STALE_CLIENTID(clid, nn))
|
|
return nfserr_stale_clientid;
|
|
|
|
/*
|
|
* For v4.1+ we get the client in the SEQUENCE op. If we don't have one
|
|
* cached already then we know this is for is for v4.0 and "sessions"
|
|
* will be false.
|
|
*/
|
|
WARN_ON_ONCE(cstate->session);
|
|
spin_lock(&nn->client_lock);
|
|
found = find_confirmed_client(clid, false, nn);
|
|
if (!found) {
|
|
spin_unlock(&nn->client_lock);
|
|
return nfserr_expired;
|
|
}
|
|
atomic_inc(&found->cl_refcount);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
/* Cache the nfs4_client in cstate! */
|
|
cstate->clp = found;
|
|
return nfs_ok;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_process_open1(struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open *open, struct nfsd_net *nn)
|
|
{
|
|
clientid_t *clientid = &open->op_clientid;
|
|
struct nfs4_client *clp = NULL;
|
|
unsigned int strhashval;
|
|
struct nfs4_openowner *oo = NULL;
|
|
__be32 status;
|
|
|
|
if (STALE_CLIENTID(&open->op_clientid, nn))
|
|
return nfserr_stale_clientid;
|
|
/*
|
|
* In case we need it later, after we've already created the
|
|
* file and don't want to risk a further failure:
|
|
*/
|
|
open->op_file = nfsd4_alloc_file();
|
|
if (open->op_file == NULL)
|
|
return nfserr_jukebox;
|
|
|
|
status = lookup_clientid(clientid, cstate, nn);
|
|
if (status)
|
|
return status;
|
|
clp = cstate->clp;
|
|
|
|
strhashval = ownerstr_hashval(&open->op_owner);
|
|
oo = find_openstateowner_str(strhashval, open, clp);
|
|
open->op_openowner = oo;
|
|
if (!oo) {
|
|
goto new_owner;
|
|
}
|
|
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
|
|
/* Replace unconfirmed owners without checking for replay. */
|
|
release_openowner(oo);
|
|
open->op_openowner = NULL;
|
|
goto new_owner;
|
|
}
|
|
status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
|
|
if (status)
|
|
return status;
|
|
goto alloc_stateid;
|
|
new_owner:
|
|
oo = alloc_init_open_stateowner(strhashval, open, cstate);
|
|
if (oo == NULL)
|
|
return nfserr_jukebox;
|
|
open->op_openowner = oo;
|
|
alloc_stateid:
|
|
open->op_stp = nfs4_alloc_open_stateid(clp);
|
|
if (!open->op_stp)
|
|
return nfserr_jukebox;
|
|
|
|
if (nfsd4_has_session(cstate) &&
|
|
(cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
|
|
open->op_odstate = alloc_clnt_odstate(clp);
|
|
if (!open->op_odstate)
|
|
return nfserr_jukebox;
|
|
}
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
static inline __be32
|
|
nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
|
|
{
|
|
if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
|
|
return nfserr_openmode;
|
|
else
|
|
return nfs_ok;
|
|
}
|
|
|
|
static int share_access_to_flags(u32 share_access)
|
|
{
|
|
return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
|
|
}
|
|
|
|
static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
|
|
{
|
|
struct nfs4_stid *ret;
|
|
|
|
ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
|
|
if (!ret)
|
|
return NULL;
|
|
return delegstateid(ret);
|
|
}
|
|
|
|
static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
|
|
{
|
|
return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
|
|
open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
|
|
}
|
|
|
|
static __be32
|
|
nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
|
|
struct nfs4_delegation **dp)
|
|
{
|
|
int flags;
|
|
__be32 status = nfserr_bad_stateid;
|
|
struct nfs4_delegation *deleg;
|
|
|
|
deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
|
|
if (deleg == NULL)
|
|
goto out;
|
|
flags = share_access_to_flags(open->op_share_access);
|
|
status = nfs4_check_delegmode(deleg, flags);
|
|
if (status) {
|
|
nfs4_put_stid(&deleg->dl_stid);
|
|
goto out;
|
|
}
|
|
*dp = deleg;
|
|
out:
|
|
if (!nfsd4_is_deleg_cur(open))
|
|
return nfs_ok;
|
|
if (status)
|
|
return status;
|
|
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
|
|
return nfs_ok;
|
|
}
|
|
|
|
static inline int nfs4_access_to_access(u32 nfs4_access)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (nfs4_access & NFS4_SHARE_ACCESS_READ)
|
|
flags |= NFSD_MAY_READ;
|
|
if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
|
|
flags |= NFSD_MAY_WRITE;
|
|
return flags;
|
|
}
|
|
|
|
static inline __be32
|
|
nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
|
|
struct nfsd4_open *open)
|
|
{
|
|
struct iattr iattr = {
|
|
.ia_valid = ATTR_SIZE,
|
|
.ia_size = 0,
|
|
};
|
|
if (!open->op_truncate)
|
|
return 0;
|
|
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
|
|
return nfserr_inval;
|
|
return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
|
|
}
|
|
|
|
static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
|
|
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
|
|
struct nfsd4_open *open)
|
|
{
|
|
struct file *filp = NULL;
|
|
__be32 status;
|
|
int oflag = nfs4_access_to_omode(open->op_share_access);
|
|
int access = nfs4_access_to_access(open->op_share_access);
|
|
unsigned char old_access_bmap, old_deny_bmap;
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
|
|
/*
|
|
* Are we trying to set a deny mode that would conflict with
|
|
* current access?
|
|
*/
|
|
status = nfs4_file_check_deny(fp, open->op_share_deny);
|
|
if (status != nfs_ok) {
|
|
spin_unlock(&fp->fi_lock);
|
|
goto out;
|
|
}
|
|
|
|
/* set access to the file */
|
|
status = nfs4_file_get_access(fp, open->op_share_access);
|
|
if (status != nfs_ok) {
|
|
spin_unlock(&fp->fi_lock);
|
|
goto out;
|
|
}
|
|
|
|
/* Set access bits in stateid */
|
|
old_access_bmap = stp->st_access_bmap;
|
|
set_access(open->op_share_access, stp);
|
|
|
|
/* Set new deny mask */
|
|
old_deny_bmap = stp->st_deny_bmap;
|
|
set_deny(open->op_share_deny, stp);
|
|
fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
|
|
|
|
if (!fp->fi_fds[oflag]) {
|
|
spin_unlock(&fp->fi_lock);
|
|
status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
|
|
if (status)
|
|
goto out_put_access;
|
|
spin_lock(&fp->fi_lock);
|
|
if (!fp->fi_fds[oflag]) {
|
|
fp->fi_fds[oflag] = filp;
|
|
filp = NULL;
|
|
}
|
|
}
|
|
spin_unlock(&fp->fi_lock);
|
|
if (filp)
|
|
fput(filp);
|
|
|
|
status = nfsd4_truncate(rqstp, cur_fh, open);
|
|
if (status)
|
|
goto out_put_access;
|
|
out:
|
|
return status;
|
|
out_put_access:
|
|
stp->st_access_bmap = old_access_bmap;
|
|
nfs4_file_put_access(fp, open->op_share_access);
|
|
reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
|
|
goto out;
|
|
}
|
|
|
|
static __be32
|
|
nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
|
|
{
|
|
__be32 status;
|
|
unsigned char old_deny_bmap = stp->st_deny_bmap;
|
|
|
|
if (!test_access(open->op_share_access, stp))
|
|
return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
|
|
|
|
/* test and set deny mode */
|
|
spin_lock(&fp->fi_lock);
|
|
status = nfs4_file_check_deny(fp, open->op_share_deny);
|
|
if (status == nfs_ok) {
|
|
set_deny(open->op_share_deny, stp);
|
|
fp->fi_share_deny |=
|
|
(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
|
|
}
|
|
spin_unlock(&fp->fi_lock);
|
|
|
|
if (status != nfs_ok)
|
|
return status;
|
|
|
|
status = nfsd4_truncate(rqstp, cur_fh, open);
|
|
if (status != nfs_ok)
|
|
reset_union_bmap_deny(old_deny_bmap, stp);
|
|
return status;
|
|
}
|
|
|
|
/* Should we give out recallable state?: */
|
|
static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
|
|
{
|
|
if (clp->cl_cb_state == NFSD4_CB_UP)
|
|
return true;
|
|
/*
|
|
* In the sessions case, since we don't have to establish a
|
|
* separate connection for callbacks, we assume it's OK
|
|
* until we hear otherwise:
|
|
*/
|
|
return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
|
|
}
|
|
|
|
static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
|
|
{
|
|
struct file_lock *fl;
|
|
|
|
fl = locks_alloc_lock();
|
|
if (!fl)
|
|
return NULL;
|
|
fl->fl_lmops = &nfsd_lease_mng_ops;
|
|
fl->fl_flags = FL_DELEG;
|
|
fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
|
|
fl->fl_end = OFFSET_MAX;
|
|
fl->fl_owner = (fl_owner_t)fp;
|
|
fl->fl_pid = current->tgid;
|
|
return fl;
|
|
}
|
|
|
|
/**
|
|
* nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
|
|
* @dp: a pointer to the nfs4_delegation we're adding.
|
|
*
|
|
* Return:
|
|
* On success: Return code will be 0 on success.
|
|
*
|
|
* On error: -EAGAIN if there was an existing delegation.
|
|
* nonzero if there is an error in other cases.
|
|
*
|
|
*/
|
|
|
|
static int nfs4_setlease(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_file *fp = dp->dl_stid.sc_file;
|
|
struct file_lock *fl;
|
|
struct file *filp;
|
|
int status = 0;
|
|
|
|
fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
|
|
if (!fl)
|
|
return -ENOMEM;
|
|
filp = find_readable_file(fp);
|
|
if (!filp) {
|
|
/* We should always have a readable file here */
|
|
WARN_ON_ONCE(1);
|
|
locks_free_lock(fl);
|
|
return -EBADF;
|
|
}
|
|
fl->fl_file = filp;
|
|
status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
|
|
if (fl)
|
|
locks_free_lock(fl);
|
|
if (status)
|
|
goto out_fput;
|
|
spin_lock(&state_lock);
|
|
spin_lock(&fp->fi_lock);
|
|
/* Did the lease get broken before we took the lock? */
|
|
status = -EAGAIN;
|
|
if (fp->fi_had_conflict)
|
|
goto out_unlock;
|
|
/* Race breaker */
|
|
if (fp->fi_deleg_file) {
|
|
status = hash_delegation_locked(dp, fp);
|
|
goto out_unlock;
|
|
}
|
|
fp->fi_deleg_file = filp;
|
|
fp->fi_delegees = 0;
|
|
status = hash_delegation_locked(dp, fp);
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
if (status) {
|
|
/* Should never happen, this is a new fi_deleg_file */
|
|
WARN_ON_ONCE(1);
|
|
goto out_fput;
|
|
}
|
|
return 0;
|
|
out_unlock:
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
out_fput:
|
|
fput(filp);
|
|
return status;
|
|
}
|
|
|
|
static struct nfs4_delegation *
|
|
nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
|
|
struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
|
|
{
|
|
int status;
|
|
struct nfs4_delegation *dp;
|
|
|
|
if (fp->fi_had_conflict)
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
spin_lock(&state_lock);
|
|
spin_lock(&fp->fi_lock);
|
|
status = nfs4_get_existing_delegation(clp, fp);
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
|
|
if (status)
|
|
return ERR_PTR(status);
|
|
|
|
dp = alloc_init_deleg(clp, fh, odstate);
|
|
if (!dp)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
get_nfs4_file(fp);
|
|
spin_lock(&state_lock);
|
|
spin_lock(&fp->fi_lock);
|
|
dp->dl_stid.sc_file = fp;
|
|
if (!fp->fi_deleg_file) {
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
status = nfs4_setlease(dp);
|
|
goto out;
|
|
}
|
|
if (fp->fi_had_conflict) {
|
|
status = -EAGAIN;
|
|
goto out_unlock;
|
|
}
|
|
status = hash_delegation_locked(dp, fp);
|
|
out_unlock:
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
out:
|
|
if (status) {
|
|
put_clnt_odstate(dp->dl_clnt_odstate);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
return ERR_PTR(status);
|
|
}
|
|
return dp;
|
|
}
|
|
|
|
static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
|
|
{
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
|
|
if (status == -EAGAIN)
|
|
open->op_why_no_deleg = WND4_CONTENTION;
|
|
else {
|
|
open->op_why_no_deleg = WND4_RESOURCE;
|
|
switch (open->op_deleg_want) {
|
|
case NFS4_SHARE_WANT_READ_DELEG:
|
|
case NFS4_SHARE_WANT_WRITE_DELEG:
|
|
case NFS4_SHARE_WANT_ANY_DELEG:
|
|
break;
|
|
case NFS4_SHARE_WANT_CANCEL:
|
|
open->op_why_no_deleg = WND4_CANCELLED;
|
|
break;
|
|
case NFS4_SHARE_WANT_NO_DELEG:
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attempt to hand out a delegation.
|
|
*
|
|
* Note we don't support write delegations, and won't until the vfs has
|
|
* proper support for them.
|
|
*/
|
|
static void
|
|
nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
|
|
struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
struct nfs4_openowner *oo = openowner(stp->st_stateowner);
|
|
struct nfs4_client *clp = stp->st_stid.sc_client;
|
|
int cb_up;
|
|
int status = 0;
|
|
|
|
cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
|
|
open->op_recall = 0;
|
|
switch (open->op_claim_type) {
|
|
case NFS4_OPEN_CLAIM_PREVIOUS:
|
|
if (!cb_up)
|
|
open->op_recall = 1;
|
|
if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
|
|
goto out_no_deleg;
|
|
break;
|
|
case NFS4_OPEN_CLAIM_NULL:
|
|
case NFS4_OPEN_CLAIM_FH:
|
|
/*
|
|
* Let's not give out any delegations till everyone's
|
|
* had the chance to reclaim theirs, *and* until
|
|
* NLM locks have all been reclaimed:
|
|
*/
|
|
if (locks_in_grace(clp->net))
|
|
goto out_no_deleg;
|
|
if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
|
|
goto out_no_deleg;
|
|
/*
|
|
* Also, if the file was opened for write or
|
|
* create, there's a good chance the client's
|
|
* about to write to it, resulting in an
|
|
* immediate recall (since we don't support
|
|
* write delegations):
|
|
*/
|
|
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
|
|
goto out_no_deleg;
|
|
if (open->op_create == NFS4_OPEN_CREATE)
|
|
goto out_no_deleg;
|
|
break;
|
|
default:
|
|
goto out_no_deleg;
|
|
}
|
|
dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
|
|
if (IS_ERR(dp))
|
|
goto out_no_deleg;
|
|
|
|
memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
|
|
|
|
dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
|
|
STATEID_VAL(&dp->dl_stid.sc_stateid));
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
return;
|
|
out_no_deleg:
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
|
|
if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
|
|
open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
|
|
dprintk("NFSD: WARNING: refusing delegation reclaim\n");
|
|
open->op_recall = 1;
|
|
}
|
|
|
|
/* 4.1 client asking for a delegation? */
|
|
if (open->op_deleg_want)
|
|
nfsd4_open_deleg_none_ext(open, status);
|
|
return;
|
|
}
|
|
|
|
static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
|
|
struct nfs4_delegation *dp)
|
|
{
|
|
if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
|
|
dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
|
|
open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
|
|
} else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
|
|
dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
|
|
open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
|
|
}
|
|
/* Otherwise the client must be confused wanting a delegation
|
|
* it already has, therefore we don't return
|
|
* NFS4_OPEN_DELEGATE_NONE_EXT and reason.
|
|
*/
|
|
}
|
|
|
|
__be32
|
|
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
|
|
{
|
|
struct nfsd4_compoundres *resp = rqstp->rq_resp;
|
|
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
|
|
struct nfs4_file *fp = NULL;
|
|
struct nfs4_ol_stateid *stp = NULL;
|
|
struct nfs4_ol_stateid *swapstp = NULL;
|
|
struct nfs4_delegation *dp = NULL;
|
|
__be32 status;
|
|
|
|
/*
|
|
* Lookup file; if found, lookup stateid and check open request,
|
|
* and check for delegations in the process of being recalled.
|
|
* If not found, create the nfs4_file struct
|
|
*/
|
|
fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
|
|
if (fp != open->op_file) {
|
|
status = nfs4_check_deleg(cl, open, &dp);
|
|
if (status)
|
|
goto out;
|
|
spin_lock(&fp->fi_lock);
|
|
stp = nfsd4_find_existing_open(fp, open);
|
|
spin_unlock(&fp->fi_lock);
|
|
} else {
|
|
open->op_file = NULL;
|
|
status = nfserr_bad_stateid;
|
|
if (nfsd4_is_deleg_cur(open))
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* OPEN the file, or upgrade an existing OPEN.
|
|
* If truncate fails, the OPEN fails.
|
|
*/
|
|
if (stp) {
|
|
/* Stateid was found, this is an OPEN upgrade */
|
|
down_read(&stp->st_rwsem);
|
|
status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
|
|
if (status) {
|
|
up_read(&stp->st_rwsem);
|
|
goto out;
|
|
}
|
|
} else {
|
|
stp = open->op_stp;
|
|
open->op_stp = NULL;
|
|
swapstp = init_open_stateid(stp, fp, open);
|
|
if (swapstp) {
|
|
nfs4_put_stid(&stp->st_stid);
|
|
stp = swapstp;
|
|
down_read(&stp->st_rwsem);
|
|
status = nfs4_upgrade_open(rqstp, fp, current_fh,
|
|
stp, open);
|
|
if (status) {
|
|
up_read(&stp->st_rwsem);
|
|
goto out;
|
|
}
|
|
goto upgrade_out;
|
|
}
|
|
down_read(&stp->st_rwsem);
|
|
status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
|
|
if (status) {
|
|
up_read(&stp->st_rwsem);
|
|
release_open_stateid(stp);
|
|
goto out;
|
|
}
|
|
|
|
stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
|
|
open->op_odstate);
|
|
if (stp->st_clnt_odstate == open->op_odstate)
|
|
open->op_odstate = NULL;
|
|
}
|
|
upgrade_out:
|
|
nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
|
|
up_read(&stp->st_rwsem);
|
|
|
|
if (nfsd4_has_session(&resp->cstate)) {
|
|
if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
|
|
open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
|
|
open->op_why_no_deleg = WND4_NOT_WANTED;
|
|
goto nodeleg;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attempt to hand out a delegation. No error return, because the
|
|
* OPEN succeeds even if we fail.
|
|
*/
|
|
nfs4_open_delegation(current_fh, open, stp);
|
|
nodeleg:
|
|
status = nfs_ok;
|
|
|
|
dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
|
|
STATEID_VAL(&stp->st_stid.sc_stateid));
|
|
out:
|
|
/* 4.1 client trying to upgrade/downgrade delegation? */
|
|
if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
|
|
open->op_deleg_want)
|
|
nfsd4_deleg_xgrade_none_ext(open, dp);
|
|
|
|
if (fp)
|
|
put_nfs4_file(fp);
|
|
if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
|
|
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
|
|
/*
|
|
* To finish the open response, we just need to set the rflags.
|
|
*/
|
|
open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
|
|
if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
|
|
!nfsd4_has_session(&resp->cstate))
|
|
open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
|
|
if (dp)
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
if (stp)
|
|
nfs4_put_stid(&stp->st_stid);
|
|
|
|
return status;
|
|
}
|
|
|
|
void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open *open)
|
|
{
|
|
if (open->op_openowner) {
|
|
struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
|
|
|
|
nfsd4_cstate_assign_replay(cstate, so);
|
|
nfs4_put_stateowner(so);
|
|
}
|
|
if (open->op_file)
|
|
kmem_cache_free(file_slab, open->op_file);
|
|
if (open->op_stp)
|
|
nfs4_put_stid(&open->op_stp->st_stid);
|
|
if (open->op_odstate)
|
|
kmem_cache_free(odstate_slab, open->op_odstate);
|
|
}
|
|
|
|
__be32
|
|
nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
clientid_t *clid)
|
|
{
|
|
struct nfs4_client *clp;
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
dprintk("process_renew(%08x/%08x): starting\n",
|
|
clid->cl_boot, clid->cl_id);
|
|
status = lookup_clientid(clid, cstate, nn);
|
|
if (status)
|
|
goto out;
|
|
clp = cstate->clp;
|
|
status = nfserr_cb_path_down;
|
|
if (!list_empty(&clp->cl_delegations)
|
|
&& clp->cl_cb_state != NFSD4_CB_UP)
|
|
goto out;
|
|
status = nfs_ok;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
void
|
|
nfsd4_end_grace(struct nfsd_net *nn)
|
|
{
|
|
/* do nothing if grace period already ended */
|
|
if (nn->grace_ended)
|
|
return;
|
|
|
|
dprintk("NFSD: end of grace period\n");
|
|
nn->grace_ended = true;
|
|
/*
|
|
* If the server goes down again right now, an NFSv4
|
|
* client will still be allowed to reclaim after it comes back up,
|
|
* even if it hasn't yet had a chance to reclaim state this time.
|
|
*
|
|
*/
|
|
nfsd4_record_grace_done(nn);
|
|
/*
|
|
* At this point, NFSv4 clients can still reclaim. But if the
|
|
* server crashes, any that have not yet reclaimed will be out
|
|
* of luck on the next boot.
|
|
*
|
|
* (NFSv4.1+ clients are considered to have reclaimed once they
|
|
* call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
|
|
* have reclaimed after their first OPEN.)
|
|
*/
|
|
locks_end_grace(&nn->nfsd4_manager);
|
|
/*
|
|
* At this point, and once lockd and/or any other containers
|
|
* exit their grace period, further reclaims will fail and
|
|
* regular locking can resume.
|
|
*/
|
|
}
|
|
|
|
static time_t
|
|
nfs4_laundromat(struct nfsd_net *nn)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_openowner *oo;
|
|
struct nfs4_delegation *dp;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct list_head *pos, *next, reaplist;
|
|
time_t cutoff = get_seconds() - nn->nfsd4_lease;
|
|
time_t t, new_timeo = nn->nfsd4_lease;
|
|
|
|
dprintk("NFSD: laundromat service - starting\n");
|
|
nfsd4_end_grace(nn);
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_safe(pos, next, &nn->client_lru) {
|
|
clp = list_entry(pos, struct nfs4_client, cl_lru);
|
|
if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
|
|
t = clp->cl_time - cutoff;
|
|
new_timeo = min(new_timeo, t);
|
|
break;
|
|
}
|
|
if (mark_client_expired_locked(clp)) {
|
|
dprintk("NFSD: client in use (clientid %08x)\n",
|
|
clp->cl_clientid.cl_id);
|
|
continue;
|
|
}
|
|
list_add(&clp->cl_lru, &reaplist);
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
list_for_each_safe(pos, next, &reaplist) {
|
|
clp = list_entry(pos, struct nfs4_client, cl_lru);
|
|
dprintk("NFSD: purging unused client (clientid %08x)\n",
|
|
clp->cl_clientid.cl_id);
|
|
list_del_init(&clp->cl_lru);
|
|
expire_client(clp);
|
|
}
|
|
spin_lock(&state_lock);
|
|
list_for_each_safe(pos, next, &nn->del_recall_lru) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
|
|
t = dp->dl_time - cutoff;
|
|
new_timeo = min(new_timeo, t);
|
|
break;
|
|
}
|
|
WARN_ON(!unhash_delegation_locked(dp));
|
|
list_add(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&state_lock);
|
|
while (!list_empty(&reaplist)) {
|
|
dp = list_first_entry(&reaplist, struct nfs4_delegation,
|
|
dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
revoke_delegation(dp);
|
|
}
|
|
|
|
spin_lock(&nn->client_lock);
|
|
while (!list_empty(&nn->close_lru)) {
|
|
oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
|
|
oo_close_lru);
|
|
if (time_after((unsigned long)oo->oo_time,
|
|
(unsigned long)cutoff)) {
|
|
t = oo->oo_time - cutoff;
|
|
new_timeo = min(new_timeo, t);
|
|
break;
|
|
}
|
|
list_del_init(&oo->oo_close_lru);
|
|
stp = oo->oo_last_closed_stid;
|
|
oo->oo_last_closed_stid = NULL;
|
|
spin_unlock(&nn->client_lock);
|
|
nfs4_put_stid(&stp->st_stid);
|
|
spin_lock(&nn->client_lock);
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
|
|
return new_timeo;
|
|
}
|
|
|
|
static struct workqueue_struct *laundry_wq;
|
|
static void laundromat_main(struct work_struct *);
|
|
|
|
static void
|
|
laundromat_main(struct work_struct *laundry)
|
|
{
|
|
time_t t;
|
|
struct delayed_work *dwork = to_delayed_work(laundry);
|
|
struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
|
|
laundromat_work);
|
|
|
|
t = nfs4_laundromat(nn);
|
|
dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
|
|
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
|
|
}
|
|
|
|
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
|
|
{
|
|
if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
|
|
return nfserr_bad_stateid;
|
|
return nfs_ok;
|
|
}
|
|
|
|
static inline int
|
|
access_permit_read(struct nfs4_ol_stateid *stp)
|
|
{
|
|
return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
|
|
test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
|
|
test_access(NFS4_SHARE_ACCESS_WRITE, stp);
|
|
}
|
|
|
|
static inline int
|
|
access_permit_write(struct nfs4_ol_stateid *stp)
|
|
{
|
|
return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
|
|
test_access(NFS4_SHARE_ACCESS_BOTH, stp);
|
|
}
|
|
|
|
static
|
|
__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
|
|
{
|
|
__be32 status = nfserr_openmode;
|
|
|
|
/* For lock stateid's, we test the parent open, not the lock: */
|
|
if (stp->st_openstp)
|
|
stp = stp->st_openstp;
|
|
if ((flags & WR_STATE) && !access_permit_write(stp))
|
|
goto out;
|
|
if ((flags & RD_STATE) && !access_permit_read(stp))
|
|
goto out;
|
|
status = nfs_ok;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static inline __be32
|
|
check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
|
|
{
|
|
if (ONE_STATEID(stateid) && (flags & RD_STATE))
|
|
return nfs_ok;
|
|
else if (opens_in_grace(net)) {
|
|
/* Answer in remaining cases depends on existence of
|
|
* conflicting state; so we must wait out the grace period. */
|
|
return nfserr_grace;
|
|
} else if (flags & WR_STATE)
|
|
return nfs4_share_conflict(current_fh,
|
|
NFS4_SHARE_DENY_WRITE);
|
|
else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
|
|
return nfs4_share_conflict(current_fh,
|
|
NFS4_SHARE_DENY_READ);
|
|
}
|
|
|
|
/*
|
|
* Allow READ/WRITE during grace period on recovered state only for files
|
|
* that are not able to provide mandatory locking.
|
|
*/
|
|
static inline int
|
|
grace_disallows_io(struct net *net, struct inode *inode)
|
|
{
|
|
return opens_in_grace(net) && mandatory_lock(inode);
|
|
}
|
|
|
|
/* Returns true iff a is later than b: */
|
|
static bool stateid_generation_after(stateid_t *a, stateid_t *b)
|
|
{
|
|
return (s32)(a->si_generation - b->si_generation) > 0;
|
|
}
|
|
|
|
static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
|
|
{
|
|
/*
|
|
* When sessions are used the stateid generation number is ignored
|
|
* when it is zero.
|
|
*/
|
|
if (has_session && in->si_generation == 0)
|
|
return nfs_ok;
|
|
|
|
if (in->si_generation == ref->si_generation)
|
|
return nfs_ok;
|
|
|
|
/* If the client sends us a stateid from the future, it's buggy: */
|
|
if (stateid_generation_after(in, ref))
|
|
return nfserr_bad_stateid;
|
|
/*
|
|
* However, we could see a stateid from the past, even from a
|
|
* non-buggy client. For example, if the client sends a lock
|
|
* while some IO is outstanding, the lock may bump si_generation
|
|
* while the IO is still in flight. The client could avoid that
|
|
* situation by waiting for responses on all the IO requests,
|
|
* but better performance may result in retrying IO that
|
|
* receives an old_stateid error if requests are rarely
|
|
* reordered in flight:
|
|
*/
|
|
return nfserr_old_stateid;
|
|
}
|
|
|
|
static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
|
|
{
|
|
if (ols->st_stateowner->so_is_open_owner &&
|
|
!(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
|
|
return nfserr_bad_stateid;
|
|
return nfs_ok;
|
|
}
|
|
|
|
static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
|
|
{
|
|
struct nfs4_stid *s;
|
|
__be32 status = nfserr_bad_stateid;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
|
|
return status;
|
|
/* Client debugging aid. */
|
|
if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
|
|
char addr_str[INET6_ADDRSTRLEN];
|
|
rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
|
|
sizeof(addr_str));
|
|
pr_warn_ratelimited("NFSD: client %s testing state ID "
|
|
"with incorrect client ID\n", addr_str);
|
|
return status;
|
|
}
|
|
spin_lock(&cl->cl_lock);
|
|
s = find_stateid_locked(cl, stateid);
|
|
if (!s)
|
|
goto out_unlock;
|
|
status = check_stateid_generation(stateid, &s->sc_stateid, 1);
|
|
if (status)
|
|
goto out_unlock;
|
|
switch (s->sc_type) {
|
|
case NFS4_DELEG_STID:
|
|
status = nfs_ok;
|
|
break;
|
|
case NFS4_REVOKED_DELEG_STID:
|
|
status = nfserr_deleg_revoked;
|
|
break;
|
|
case NFS4_OPEN_STID:
|
|
case NFS4_LOCK_STID:
|
|
status = nfsd4_check_openowner_confirmed(openlockstateid(s));
|
|
break;
|
|
default:
|
|
printk("unknown stateid type %x\n", s->sc_type);
|
|
/* Fallthrough */
|
|
case NFS4_CLOSED_STID:
|
|
case NFS4_CLOSED_DELEG_STID:
|
|
status = nfserr_bad_stateid;
|
|
}
|
|
out_unlock:
|
|
spin_unlock(&cl->cl_lock);
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
|
|
stateid_t *stateid, unsigned char typemask,
|
|
struct nfs4_stid **s, struct nfsd_net *nn)
|
|
{
|
|
__be32 status;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
|
|
return nfserr_bad_stateid;
|
|
status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
|
|
if (status == nfserr_stale_clientid) {
|
|
if (cstate->session)
|
|
return nfserr_bad_stateid;
|
|
return nfserr_stale_stateid;
|
|
}
|
|
if (status)
|
|
return status;
|
|
*s = find_stateid_by_type(cstate->clp, stateid, typemask);
|
|
if (!*s)
|
|
return nfserr_bad_stateid;
|
|
return nfs_ok;
|
|
}
|
|
|
|
static struct file *
|
|
nfs4_find_file(struct nfs4_stid *s, int flags)
|
|
{
|
|
if (!s)
|
|
return NULL;
|
|
|
|
switch (s->sc_type) {
|
|
case NFS4_DELEG_STID:
|
|
if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
|
|
return NULL;
|
|
return get_file(s->sc_file->fi_deleg_file);
|
|
case NFS4_OPEN_STID:
|
|
case NFS4_LOCK_STID:
|
|
if (flags & RD_STATE)
|
|
return find_readable_file(s->sc_file);
|
|
else
|
|
return find_writeable_file(s->sc_file);
|
|
break;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static __be32
|
|
nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
|
|
{
|
|
__be32 status;
|
|
|
|
status = nfsd4_check_openowner_confirmed(ols);
|
|
if (status)
|
|
return status;
|
|
return nfs4_check_openmode(ols, flags);
|
|
}
|
|
|
|
static __be32
|
|
nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
|
|
struct file **filpp, bool *tmp_file, int flags)
|
|
{
|
|
int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
|
|
struct file *file;
|
|
__be32 status;
|
|
|
|
file = nfs4_find_file(s, flags);
|
|
if (file) {
|
|
status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
|
|
acc | NFSD_MAY_OWNER_OVERRIDE);
|
|
if (status) {
|
|
fput(file);
|
|
return status;
|
|
}
|
|
|
|
*filpp = file;
|
|
} else {
|
|
status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
|
|
if (status)
|
|
return status;
|
|
|
|
if (tmp_file)
|
|
*tmp_file = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Checks for stateid operations
|
|
*/
|
|
__be32
|
|
nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
|
|
stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
|
|
{
|
|
struct inode *ino = d_inode(fhp->fh_dentry);
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct nfs4_stid *s = NULL;
|
|
__be32 status;
|
|
|
|
if (filpp)
|
|
*filpp = NULL;
|
|
if (tmp_file)
|
|
*tmp_file = false;
|
|
|
|
if (grace_disallows_io(net, ino))
|
|
return nfserr_grace;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
|
|
status = check_special_stateids(net, fhp, stateid, flags);
|
|
goto done;
|
|
}
|
|
|
|
status = nfsd4_lookup_stateid(cstate, stateid,
|
|
NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
|
|
&s, nn);
|
|
if (status)
|
|
return status;
|
|
status = check_stateid_generation(stateid, &s->sc_stateid,
|
|
nfsd4_has_session(cstate));
|
|
if (status)
|
|
goto out;
|
|
|
|
switch (s->sc_type) {
|
|
case NFS4_DELEG_STID:
|
|
status = nfs4_check_delegmode(delegstateid(s), flags);
|
|
break;
|
|
case NFS4_OPEN_STID:
|
|
case NFS4_LOCK_STID:
|
|
status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
|
|
break;
|
|
default:
|
|
status = nfserr_bad_stateid;
|
|
break;
|
|
}
|
|
if (status)
|
|
goto out;
|
|
status = nfs4_check_fh(fhp, s);
|
|
|
|
done:
|
|
if (!status && filpp)
|
|
status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
|
|
out:
|
|
if (s)
|
|
nfs4_put_stid(s);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Test if the stateid is valid
|
|
*/
|
|
__be32
|
|
nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_test_stateid *test_stateid)
|
|
{
|
|
struct nfsd4_test_stateid_id *stateid;
|
|
struct nfs4_client *cl = cstate->session->se_client;
|
|
|
|
list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
|
|
stateid->ts_id_status =
|
|
nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_free_stateid *free_stateid)
|
|
{
|
|
stateid_t *stateid = &free_stateid->fr_stateid;
|
|
struct nfs4_stid *s;
|
|
struct nfs4_delegation *dp;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct nfs4_client *cl = cstate->session->se_client;
|
|
__be32 ret = nfserr_bad_stateid;
|
|
|
|
spin_lock(&cl->cl_lock);
|
|
s = find_stateid_locked(cl, stateid);
|
|
if (!s)
|
|
goto out_unlock;
|
|
switch (s->sc_type) {
|
|
case NFS4_DELEG_STID:
|
|
ret = nfserr_locks_held;
|
|
break;
|
|
case NFS4_OPEN_STID:
|
|
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
|
|
if (ret)
|
|
break;
|
|
ret = nfserr_locks_held;
|
|
break;
|
|
case NFS4_LOCK_STID:
|
|
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
|
|
if (ret)
|
|
break;
|
|
stp = openlockstateid(s);
|
|
ret = nfserr_locks_held;
|
|
if (check_for_locks(stp->st_stid.sc_file,
|
|
lockowner(stp->st_stateowner)))
|
|
break;
|
|
WARN_ON(!unhash_lock_stateid(stp));
|
|
spin_unlock(&cl->cl_lock);
|
|
nfs4_put_stid(s);
|
|
ret = nfs_ok;
|
|
goto out;
|
|
case NFS4_REVOKED_DELEG_STID:
|
|
dp = delegstateid(s);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
spin_unlock(&cl->cl_lock);
|
|
nfs4_put_stid(s);
|
|
ret = nfs_ok;
|
|
goto out;
|
|
/* Default falls through and returns nfserr_bad_stateid */
|
|
}
|
|
out_unlock:
|
|
spin_unlock(&cl->cl_lock);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
setlkflg (int type)
|
|
{
|
|
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
|
|
RD_STATE : WR_STATE;
|
|
}
|
|
|
|
static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct svc_fh *current_fh = &cstate->current_fh;
|
|
struct nfs4_stateowner *sop = stp->st_stateowner;
|
|
__be32 status;
|
|
|
|
status = nfsd4_check_seqid(cstate, sop, seqid);
|
|
if (status)
|
|
return status;
|
|
if (stp->st_stid.sc_type == NFS4_CLOSED_STID
|
|
|| stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
|
|
/*
|
|
* "Closed" stateid's exist *only* to return
|
|
* nfserr_replay_me from the previous step, and
|
|
* revoked delegations are kept only for free_stateid.
|
|
*/
|
|
return nfserr_bad_stateid;
|
|
down_write(&stp->st_rwsem);
|
|
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
|
|
if (status == nfs_ok)
|
|
status = nfs4_check_fh(current_fh, &stp->st_stid);
|
|
if (status != nfs_ok)
|
|
up_write(&stp->st_rwsem);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Checks for sequence id mutating operations.
|
|
*/
|
|
static __be32
|
|
nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
|
|
stateid_t *stateid, char typemask,
|
|
struct nfs4_ol_stateid **stpp,
|
|
struct nfsd_net *nn)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_stid *s;
|
|
struct nfs4_ol_stateid *stp = NULL;
|
|
|
|
dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
|
|
seqid, STATEID_VAL(stateid));
|
|
|
|
*stpp = NULL;
|
|
status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
|
|
if (status)
|
|
return status;
|
|
stp = openlockstateid(s);
|
|
nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
|
|
|
|
status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
|
|
if (!status)
|
|
*stpp = stp;
|
|
else
|
|
nfs4_put_stid(&stp->st_stid);
|
|
return status;
|
|
}
|
|
|
|
static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
|
|
stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_openowner *oo;
|
|
struct nfs4_ol_stateid *stp;
|
|
|
|
status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
|
|
NFS4_OPEN_STID, &stp, nn);
|
|
if (status)
|
|
return status;
|
|
oo = openowner(stp->st_stateowner);
|
|
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
|
|
up_write(&stp->st_rwsem);
|
|
nfs4_put_stid(&stp->st_stid);
|
|
return nfserr_bad_stateid;
|
|
}
|
|
*stpp = stp;
|
|
return nfs_ok;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open_confirm *oc)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_openowner *oo;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
|
|
cstate->current_fh.fh_dentry);
|
|
|
|
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
|
|
if (status)
|
|
return status;
|
|
|
|
status = nfs4_preprocess_seqid_op(cstate,
|
|
oc->oc_seqid, &oc->oc_req_stateid,
|
|
NFS4_OPEN_STID, &stp, nn);
|
|
if (status)
|
|
goto out;
|
|
oo = openowner(stp->st_stateowner);
|
|
status = nfserr_bad_stateid;
|
|
if (oo->oo_flags & NFS4_OO_CONFIRMED) {
|
|
up_write(&stp->st_rwsem);
|
|
goto put_stateid;
|
|
}
|
|
oo->oo_flags |= NFS4_OO_CONFIRMED;
|
|
nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
|
|
up_write(&stp->st_rwsem);
|
|
dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
|
|
__func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
|
|
|
|
nfsd4_client_record_create(oo->oo_owner.so_client);
|
|
status = nfs_ok;
|
|
put_stateid:
|
|
nfs4_put_stid(&stp->st_stid);
|
|
out:
|
|
nfsd4_bump_seqid(cstate, status);
|
|
return status;
|
|
}
|
|
|
|
static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
|
|
{
|
|
if (!test_access(access, stp))
|
|
return;
|
|
nfs4_file_put_access(stp->st_stid.sc_file, access);
|
|
clear_access(access, stp);
|
|
}
|
|
|
|
static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
|
|
{
|
|
switch (to_access) {
|
|
case NFS4_SHARE_ACCESS_READ:
|
|
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
|
|
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
|
|
break;
|
|
case NFS4_SHARE_ACCESS_WRITE:
|
|
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
|
|
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
|
|
break;
|
|
case NFS4_SHARE_ACCESS_BOTH:
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
}
|
|
|
|
__be32
|
|
nfsd4_open_downgrade(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open_downgrade *od)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
|
|
cstate->current_fh.fh_dentry);
|
|
|
|
/* We don't yet support WANT bits: */
|
|
if (od->od_deleg_want)
|
|
dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
|
|
od->od_deleg_want);
|
|
|
|
status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
|
|
&od->od_stateid, &stp, nn);
|
|
if (status)
|
|
goto out;
|
|
status = nfserr_inval;
|
|
if (!test_access(od->od_share_access, stp)) {
|
|
dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
|
|
stp->st_access_bmap, od->od_share_access);
|
|
goto put_stateid;
|
|
}
|
|
if (!test_deny(od->od_share_deny, stp)) {
|
|
dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
|
|
stp->st_deny_bmap, od->od_share_deny);
|
|
goto put_stateid;
|
|
}
|
|
nfs4_stateid_downgrade(stp, od->od_share_access);
|
|
reset_union_bmap_deny(od->od_share_deny, stp);
|
|
nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
|
|
status = nfs_ok;
|
|
put_stateid:
|
|
up_write(&stp->st_rwsem);
|
|
nfs4_put_stid(&stp->st_stid);
|
|
out:
|
|
nfsd4_bump_seqid(cstate, status);
|
|
return status;
|
|
}
|
|
|
|
static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
|
|
{
|
|
struct nfs4_client *clp = s->st_stid.sc_client;
|
|
bool unhashed;
|
|
LIST_HEAD(reaplist);
|
|
|
|
s->st_stid.sc_type = NFS4_CLOSED_STID;
|
|
spin_lock(&clp->cl_lock);
|
|
unhashed = unhash_open_stateid(s, &reaplist);
|
|
|
|
if (clp->cl_minorversion) {
|
|
if (unhashed)
|
|
put_ol_stateid_locked(s, &reaplist);
|
|
spin_unlock(&clp->cl_lock);
|
|
free_ol_stateid_reaplist(&reaplist);
|
|
} else {
|
|
spin_unlock(&clp->cl_lock);
|
|
free_ol_stateid_reaplist(&reaplist);
|
|
if (unhashed)
|
|
move_to_close_lru(s, clp->net);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* nfs4_unlock_state() called after encode
|
|
*/
|
|
__be32
|
|
nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_close *close)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
dprintk("NFSD: nfsd4_close on file %pd\n",
|
|
cstate->current_fh.fh_dentry);
|
|
|
|
status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
|
|
&close->cl_stateid,
|
|
NFS4_OPEN_STID|NFS4_CLOSED_STID,
|
|
&stp, nn);
|
|
nfsd4_bump_seqid(cstate, status);
|
|
if (status)
|
|
goto out;
|
|
nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
|
|
up_write(&stp->st_rwsem);
|
|
|
|
nfsd4_close_open_stateid(stp);
|
|
|
|
/* put reference from nfs4_preprocess_seqid_op */
|
|
nfs4_put_stid(&stp->st_stid);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_delegreturn *dr)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
stateid_t *stateid = &dr->dr_stateid;
|
|
struct nfs4_stid *s;
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
|
|
return status;
|
|
|
|
status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
|
|
if (status)
|
|
goto out;
|
|
dp = delegstateid(s);
|
|
status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
|
|
if (status)
|
|
goto put_stateid;
|
|
|
|
destroy_delegation(dp);
|
|
put_stateid:
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static inline u64
|
|
end_offset(u64 start, u64 len)
|
|
{
|
|
u64 end;
|
|
|
|
end = start + len;
|
|
return end >= start ? end: NFS4_MAX_UINT64;
|
|
}
|
|
|
|
/* last octet in a range */
|
|
static inline u64
|
|
last_byte_offset(u64 start, u64 len)
|
|
{
|
|
u64 end;
|
|
|
|
WARN_ON_ONCE(!len);
|
|
end = start + len;
|
|
return end > start ? end - 1: NFS4_MAX_UINT64;
|
|
}
|
|
|
|
/*
|
|
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
|
|
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
|
|
* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
|
|
* locking, this prevents us from being completely protocol-compliant. The
|
|
* real solution to this problem is to start using unsigned file offsets in
|
|
* the VFS, but this is a very deep change!
|
|
*/
|
|
static inline void
|
|
nfs4_transform_lock_offset(struct file_lock *lock)
|
|
{
|
|
if (lock->fl_start < 0)
|
|
lock->fl_start = OFFSET_MAX;
|
|
if (lock->fl_end < 0)
|
|
lock->fl_end = OFFSET_MAX;
|
|
}
|
|
|
|
static fl_owner_t
|
|
nfsd4_fl_get_owner(fl_owner_t owner)
|
|
{
|
|
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
|
|
|
|
nfs4_get_stateowner(&lo->lo_owner);
|
|
return owner;
|
|
}
|
|
|
|
static void
|
|
nfsd4_fl_put_owner(fl_owner_t owner)
|
|
{
|
|
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
|
|
|
|
if (lo)
|
|
nfs4_put_stateowner(&lo->lo_owner);
|
|
}
|
|
|
|
static const struct lock_manager_operations nfsd_posix_mng_ops = {
|
|
.lm_get_owner = nfsd4_fl_get_owner,
|
|
.lm_put_owner = nfsd4_fl_put_owner,
|
|
};
|
|
|
|
static inline void
|
|
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
|
|
{
|
|
struct nfs4_lockowner *lo;
|
|
|
|
if (fl->fl_lmops == &nfsd_posix_mng_ops) {
|
|
lo = (struct nfs4_lockowner *) fl->fl_owner;
|
|
deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
|
|
lo->lo_owner.so_owner.len, GFP_KERNEL);
|
|
if (!deny->ld_owner.data)
|
|
/* We just don't care that much */
|
|
goto nevermind;
|
|
deny->ld_owner.len = lo->lo_owner.so_owner.len;
|
|
deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
|
|
} else {
|
|
nevermind:
|
|
deny->ld_owner.len = 0;
|
|
deny->ld_owner.data = NULL;
|
|
deny->ld_clientid.cl_boot = 0;
|
|
deny->ld_clientid.cl_id = 0;
|
|
}
|
|
deny->ld_start = fl->fl_start;
|
|
deny->ld_length = NFS4_MAX_UINT64;
|
|
if (fl->fl_end != NFS4_MAX_UINT64)
|
|
deny->ld_length = fl->fl_end - fl->fl_start + 1;
|
|
deny->ld_type = NFS4_READ_LT;
|
|
if (fl->fl_type != F_RDLCK)
|
|
deny->ld_type = NFS4_WRITE_LT;
|
|
}
|
|
|
|
static struct nfs4_lockowner *
|
|
find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
|
|
{
|
|
unsigned int strhashval = ownerstr_hashval(owner);
|
|
struct nfs4_stateowner *so;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
|
|
so_strhash) {
|
|
if (so->so_is_open_owner)
|
|
continue;
|
|
if (same_owner_str(so, owner))
|
|
return lockowner(nfs4_get_stateowner(so));
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_lockowner *
|
|
find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
|
|
{
|
|
struct nfs4_lockowner *lo;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
lo = find_lockowner_str_locked(clp, owner);
|
|
spin_unlock(&clp->cl_lock);
|
|
return lo;
|
|
}
|
|
|
|
static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
|
|
{
|
|
unhash_lockowner_locked(lockowner(sop));
|
|
}
|
|
|
|
static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
|
|
{
|
|
struct nfs4_lockowner *lo = lockowner(sop);
|
|
|
|
kmem_cache_free(lockowner_slab, lo);
|
|
}
|
|
|
|
static const struct nfs4_stateowner_operations lockowner_ops = {
|
|
.so_unhash = nfs4_unhash_lockowner,
|
|
.so_free = nfs4_free_lockowner,
|
|
};
|
|
|
|
/*
|
|
* Alloc a lock owner structure.
|
|
* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
|
|
* occurred.
|
|
*
|
|
* strhashval = ownerstr_hashval
|
|
*/
|
|
static struct nfs4_lockowner *
|
|
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
|
|
struct nfs4_ol_stateid *open_stp,
|
|
struct nfsd4_lock *lock)
|
|
{
|
|
struct nfs4_lockowner *lo, *ret;
|
|
|
|
lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
|
|
if (!lo)
|
|
return NULL;
|
|
INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
|
|
lo->lo_owner.so_is_open_owner = 0;
|
|
lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
|
|
lo->lo_owner.so_ops = &lockowner_ops;
|
|
spin_lock(&clp->cl_lock);
|
|
ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
|
|
if (ret == NULL) {
|
|
list_add(&lo->lo_owner.so_strhash,
|
|
&clp->cl_ownerstr_hashtbl[strhashval]);
|
|
ret = lo;
|
|
} else
|
|
nfs4_free_stateowner(&lo->lo_owner);
|
|
|
|
spin_unlock(&clp->cl_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
|
|
struct nfs4_file *fp, struct inode *inode,
|
|
struct nfs4_ol_stateid *open_stp)
|
|
{
|
|
struct nfs4_client *clp = lo->lo_owner.so_client;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
atomic_inc(&stp->st_stid.sc_count);
|
|
stp->st_stid.sc_type = NFS4_LOCK_STID;
|
|
stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
|
|
get_nfs4_file(fp);
|
|
stp->st_stid.sc_file = fp;
|
|
stp->st_stid.sc_free = nfs4_free_lock_stateid;
|
|
stp->st_access_bmap = 0;
|
|
stp->st_deny_bmap = open_stp->st_deny_bmap;
|
|
stp->st_openstp = open_stp;
|
|
init_rwsem(&stp->st_rwsem);
|
|
list_add(&stp->st_locks, &open_stp->st_locks);
|
|
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
|
|
spin_lock(&fp->fi_lock);
|
|
list_add(&stp->st_perfile, &fp->fi_stateids);
|
|
spin_unlock(&fp->fi_lock);
|
|
}
|
|
|
|
static struct nfs4_ol_stateid *
|
|
find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
|
|
{
|
|
struct nfs4_ol_stateid *lst;
|
|
struct nfs4_client *clp = lo->lo_owner.so_client;
|
|
|
|
lockdep_assert_held(&clp->cl_lock);
|
|
|
|
list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
|
|
if (lst->st_stid.sc_file == fp) {
|
|
atomic_inc(&lst->st_stid.sc_count);
|
|
return lst;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_ol_stateid *
|
|
find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
|
|
struct inode *inode, struct nfs4_ol_stateid *ost,
|
|
bool *new)
|
|
{
|
|
struct nfs4_stid *ns = NULL;
|
|
struct nfs4_ol_stateid *lst;
|
|
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
|
|
struct nfs4_client *clp = oo->oo_owner.so_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
lst = find_lock_stateid(lo, fi);
|
|
if (lst == NULL) {
|
|
spin_unlock(&clp->cl_lock);
|
|
ns = nfs4_alloc_stid(clp, stateid_slab);
|
|
if (ns == NULL)
|
|
return NULL;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
lst = find_lock_stateid(lo, fi);
|
|
if (likely(!lst)) {
|
|
lst = openlockstateid(ns);
|
|
init_lock_stateid(lst, lo, fi, inode, ost);
|
|
ns = NULL;
|
|
*new = true;
|
|
}
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
if (ns)
|
|
nfs4_put_stid(ns);
|
|
return lst;
|
|
}
|
|
|
|
static int
|
|
check_lock_length(u64 offset, u64 length)
|
|
{
|
|
return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
|
|
(length > ~offset)));
|
|
}
|
|
|
|
static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
|
|
{
|
|
struct nfs4_file *fp = lock_stp->st_stid.sc_file;
|
|
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
|
|
if (test_access(access, lock_stp))
|
|
return;
|
|
__nfs4_file_get_access(fp, access);
|
|
set_access(access, lock_stp);
|
|
}
|
|
|
|
static __be32
|
|
lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
|
|
struct nfs4_ol_stateid *ost,
|
|
struct nfsd4_lock *lock,
|
|
struct nfs4_ol_stateid **lst, bool *new)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_file *fi = ost->st_stid.sc_file;
|
|
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
|
|
struct nfs4_client *cl = oo->oo_owner.so_client;
|
|
struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
|
|
struct nfs4_lockowner *lo;
|
|
unsigned int strhashval;
|
|
|
|
lo = find_lockowner_str(cl, &lock->lk_new_owner);
|
|
if (!lo) {
|
|
strhashval = ownerstr_hashval(&lock->lk_new_owner);
|
|
lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
|
|
if (lo == NULL)
|
|
return nfserr_jukebox;
|
|
} else {
|
|
/* with an existing lockowner, seqids must be the same */
|
|
status = nfserr_bad_seqid;
|
|
if (!cstate->minorversion &&
|
|
lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
|
|
goto out;
|
|
}
|
|
|
|
*lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
|
|
if (*lst == NULL) {
|
|
status = nfserr_jukebox;
|
|
goto out;
|
|
}
|
|
status = nfs_ok;
|
|
out:
|
|
nfs4_put_stateowner(&lo->lo_owner);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* LOCK operation
|
|
*/
|
|
__be32
|
|
nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_lock *lock)
|
|
{
|
|
struct nfs4_openowner *open_sop = NULL;
|
|
struct nfs4_lockowner *lock_sop = NULL;
|
|
struct nfs4_ol_stateid *lock_stp = NULL;
|
|
struct nfs4_ol_stateid *open_stp = NULL;
|
|
struct nfs4_file *fp;
|
|
struct file *filp = NULL;
|
|
struct file_lock *file_lock = NULL;
|
|
struct file_lock *conflock = NULL;
|
|
__be32 status = 0;
|
|
int lkflg;
|
|
int err;
|
|
bool new = false;
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
|
|
(long long) lock->lk_offset,
|
|
(long long) lock->lk_length);
|
|
|
|
if (check_lock_length(lock->lk_offset, lock->lk_length))
|
|
return nfserr_inval;
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh,
|
|
S_IFREG, NFSD_MAY_LOCK))) {
|
|
dprintk("NFSD: nfsd4_lock: permission denied!\n");
|
|
return status;
|
|
}
|
|
|
|
if (lock->lk_is_new) {
|
|
if (nfsd4_has_session(cstate))
|
|
/* See rfc 5661 18.10.3: given clientid is ignored: */
|
|
memcpy(&lock->lk_new_clientid,
|
|
&cstate->session->se_client->cl_clientid,
|
|
sizeof(clientid_t));
|
|
|
|
status = nfserr_stale_clientid;
|
|
if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
|
|
goto out;
|
|
|
|
/* validate and update open stateid and open seqid */
|
|
status = nfs4_preprocess_confirmed_seqid_op(cstate,
|
|
lock->lk_new_open_seqid,
|
|
&lock->lk_new_open_stateid,
|
|
&open_stp, nn);
|
|
if (status)
|
|
goto out;
|
|
up_write(&open_stp->st_rwsem);
|
|
open_sop = openowner(open_stp->st_stateowner);
|
|
status = nfserr_bad_stateid;
|
|
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
|
|
&lock->lk_new_clientid))
|
|
goto out;
|
|
status = lookup_or_create_lock_state(cstate, open_stp, lock,
|
|
&lock_stp, &new);
|
|
if (status == nfs_ok)
|
|
down_write(&lock_stp->st_rwsem);
|
|
} else {
|
|
status = nfs4_preprocess_seqid_op(cstate,
|
|
lock->lk_old_lock_seqid,
|
|
&lock->lk_old_lock_stateid,
|
|
NFS4_LOCK_STID, &lock_stp, nn);
|
|
}
|
|
if (status)
|
|
goto out;
|
|
lock_sop = lockowner(lock_stp->st_stateowner);
|
|
|
|
lkflg = setlkflg(lock->lk_type);
|
|
status = nfs4_check_openmode(lock_stp, lkflg);
|
|
if (status)
|
|
goto out;
|
|
|
|
status = nfserr_grace;
|
|
if (locks_in_grace(net) && !lock->lk_reclaim)
|
|
goto out;
|
|
status = nfserr_no_grace;
|
|
if (!locks_in_grace(net) && lock->lk_reclaim)
|
|
goto out;
|
|
|
|
file_lock = locks_alloc_lock();
|
|
if (!file_lock) {
|
|
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
|
|
status = nfserr_jukebox;
|
|
goto out;
|
|
}
|
|
|
|
fp = lock_stp->st_stid.sc_file;
|
|
switch (lock->lk_type) {
|
|
case NFS4_READ_LT:
|
|
case NFS4_READW_LT:
|
|
spin_lock(&fp->fi_lock);
|
|
filp = find_readable_file_locked(fp);
|
|
if (filp)
|
|
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
|
|
spin_unlock(&fp->fi_lock);
|
|
file_lock->fl_type = F_RDLCK;
|
|
break;
|
|
case NFS4_WRITE_LT:
|
|
case NFS4_WRITEW_LT:
|
|
spin_lock(&fp->fi_lock);
|
|
filp = find_writeable_file_locked(fp);
|
|
if (filp)
|
|
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
|
|
spin_unlock(&fp->fi_lock);
|
|
file_lock->fl_type = F_WRLCK;
|
|
break;
|
|
default:
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
if (!filp) {
|
|
status = nfserr_openmode;
|
|
goto out;
|
|
}
|
|
|
|
file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
|
|
file_lock->fl_pid = current->tgid;
|
|
file_lock->fl_file = filp;
|
|
file_lock->fl_flags = FL_POSIX;
|
|
file_lock->fl_lmops = &nfsd_posix_mng_ops;
|
|
file_lock->fl_start = lock->lk_offset;
|
|
file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
|
|
nfs4_transform_lock_offset(file_lock);
|
|
|
|
conflock = locks_alloc_lock();
|
|
if (!conflock) {
|
|
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
|
|
status = nfserr_jukebox;
|
|
goto out;
|
|
}
|
|
|
|
err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
|
|
switch (-err) {
|
|
case 0: /* success! */
|
|
nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
|
|
status = 0;
|
|
break;
|
|
case (EAGAIN): /* conflock holds conflicting lock */
|
|
status = nfserr_denied;
|
|
dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
|
|
nfs4_set_lock_denied(conflock, &lock->lk_denied);
|
|
break;
|
|
case (EDEADLK):
|
|
status = nfserr_deadlock;
|
|
break;
|
|
default:
|
|
dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
|
|
status = nfserrno(err);
|
|
break;
|
|
}
|
|
out:
|
|
if (filp)
|
|
fput(filp);
|
|
if (lock_stp) {
|
|
/* Bump seqid manually if the 4.0 replay owner is openowner */
|
|
if (cstate->replay_owner &&
|
|
cstate->replay_owner != &lock_sop->lo_owner &&
|
|
seqid_mutating_err(ntohl(status)))
|
|
lock_sop->lo_owner.so_seqid++;
|
|
|
|
up_write(&lock_stp->st_rwsem);
|
|
|
|
/*
|
|
* If this is a new, never-before-used stateid, and we are
|
|
* returning an error, then just go ahead and release it.
|
|
*/
|
|
if (status && new)
|
|
release_lock_stateid(lock_stp);
|
|
|
|
nfs4_put_stid(&lock_stp->st_stid);
|
|
}
|
|
if (open_stp)
|
|
nfs4_put_stid(&open_stp->st_stid);
|
|
nfsd4_bump_seqid(cstate, status);
|
|
if (file_lock)
|
|
locks_free_lock(file_lock);
|
|
if (conflock)
|
|
locks_free_lock(conflock);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
|
|
* so we do a temporary open here just to get an open file to pass to
|
|
* vfs_test_lock. (Arguably perhaps test_lock should be done with an
|
|
* inode operation.)
|
|
*/
|
|
static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
|
|
{
|
|
struct file *file;
|
|
__be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
|
|
if (!err) {
|
|
err = nfserrno(vfs_test_lock(file, lock));
|
|
fput(file);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* LOCKT operation
|
|
*/
|
|
__be32
|
|
nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_lockt *lockt)
|
|
{
|
|
struct file_lock *file_lock = NULL;
|
|
struct nfs4_lockowner *lo = NULL;
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
if (locks_in_grace(SVC_NET(rqstp)))
|
|
return nfserr_grace;
|
|
|
|
if (check_lock_length(lockt->lt_offset, lockt->lt_length))
|
|
return nfserr_inval;
|
|
|
|
if (!nfsd4_has_session(cstate)) {
|
|
status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
|
|
if (status)
|
|
goto out;
|
|
}
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
|
|
goto out;
|
|
|
|
file_lock = locks_alloc_lock();
|
|
if (!file_lock) {
|
|
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
|
|
status = nfserr_jukebox;
|
|
goto out;
|
|
}
|
|
|
|
switch (lockt->lt_type) {
|
|
case NFS4_READ_LT:
|
|
case NFS4_READW_LT:
|
|
file_lock->fl_type = F_RDLCK;
|
|
break;
|
|
case NFS4_WRITE_LT:
|
|
case NFS4_WRITEW_LT:
|
|
file_lock->fl_type = F_WRLCK;
|
|
break;
|
|
default:
|
|
dprintk("NFSD: nfs4_lockt: bad lock type!\n");
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
|
|
lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
|
|
if (lo)
|
|
file_lock->fl_owner = (fl_owner_t)lo;
|
|
file_lock->fl_pid = current->tgid;
|
|
file_lock->fl_flags = FL_POSIX;
|
|
|
|
file_lock->fl_start = lockt->lt_offset;
|
|
file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
|
|
|
|
nfs4_transform_lock_offset(file_lock);
|
|
|
|
status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
|
|
if (status)
|
|
goto out;
|
|
|
|
if (file_lock->fl_type != F_UNLCK) {
|
|
status = nfserr_denied;
|
|
nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
|
|
}
|
|
out:
|
|
if (lo)
|
|
nfs4_put_stateowner(&lo->lo_owner);
|
|
if (file_lock)
|
|
locks_free_lock(file_lock);
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_locku *locku)
|
|
{
|
|
struct nfs4_ol_stateid *stp;
|
|
struct file *filp = NULL;
|
|
struct file_lock *file_lock = NULL;
|
|
__be32 status;
|
|
int err;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
|
|
(long long) locku->lu_offset,
|
|
(long long) locku->lu_length);
|
|
|
|
if (check_lock_length(locku->lu_offset, locku->lu_length))
|
|
return nfserr_inval;
|
|
|
|
status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
|
|
&locku->lu_stateid, NFS4_LOCK_STID,
|
|
&stp, nn);
|
|
if (status)
|
|
goto out;
|
|
filp = find_any_file(stp->st_stid.sc_file);
|
|
if (!filp) {
|
|
status = nfserr_lock_range;
|
|
goto put_stateid;
|
|
}
|
|
file_lock = locks_alloc_lock();
|
|
if (!file_lock) {
|
|
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
|
|
status = nfserr_jukebox;
|
|
goto fput;
|
|
}
|
|
|
|
file_lock->fl_type = F_UNLCK;
|
|
file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
|
|
file_lock->fl_pid = current->tgid;
|
|
file_lock->fl_file = filp;
|
|
file_lock->fl_flags = FL_POSIX;
|
|
file_lock->fl_lmops = &nfsd_posix_mng_ops;
|
|
file_lock->fl_start = locku->lu_offset;
|
|
|
|
file_lock->fl_end = last_byte_offset(locku->lu_offset,
|
|
locku->lu_length);
|
|
nfs4_transform_lock_offset(file_lock);
|
|
|
|
err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
|
|
if (err) {
|
|
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
|
|
goto out_nfserr;
|
|
}
|
|
nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
|
|
fput:
|
|
fput(filp);
|
|
put_stateid:
|
|
up_write(&stp->st_rwsem);
|
|
nfs4_put_stid(&stp->st_stid);
|
|
out:
|
|
nfsd4_bump_seqid(cstate, status);
|
|
if (file_lock)
|
|
locks_free_lock(file_lock);
|
|
return status;
|
|
|
|
out_nfserr:
|
|
status = nfserrno(err);
|
|
goto fput;
|
|
}
|
|
|
|
/*
|
|
* returns
|
|
* true: locks held by lockowner
|
|
* false: no locks held by lockowner
|
|
*/
|
|
static bool
|
|
check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
|
|
{
|
|
struct file_lock *fl;
|
|
int status = false;
|
|
struct file *filp = find_any_file(fp);
|
|
struct inode *inode;
|
|
struct file_lock_context *flctx;
|
|
|
|
if (!filp) {
|
|
/* Any valid lock stateid should have some sort of access */
|
|
WARN_ON_ONCE(1);
|
|
return status;
|
|
}
|
|
|
|
inode = file_inode(filp);
|
|
flctx = inode->i_flctx;
|
|
|
|
if (flctx && !list_empty_careful(&flctx->flc_posix)) {
|
|
spin_lock(&flctx->flc_lock);
|
|
list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
|
|
if (fl->fl_owner == (fl_owner_t)lowner) {
|
|
status = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&flctx->flc_lock);
|
|
}
|
|
fput(filp);
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_release_lockowner(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_release_lockowner *rlockowner)
|
|
{
|
|
clientid_t *clid = &rlockowner->rl_clientid;
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_lockowner *lo = NULL;
|
|
struct nfs4_ol_stateid *stp;
|
|
struct xdr_netobj *owner = &rlockowner->rl_owner;
|
|
unsigned int hashval = ownerstr_hashval(owner);
|
|
__be32 status;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
struct nfs4_client *clp;
|
|
|
|
dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
|
|
clid->cl_boot, clid->cl_id);
|
|
|
|
status = lookup_clientid(clid, cstate, nn);
|
|
if (status)
|
|
return status;
|
|
|
|
clp = cstate->clp;
|
|
/* Find the matching lock stateowner */
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
|
|
so_strhash) {
|
|
|
|
if (sop->so_is_open_owner || !same_owner_str(sop, owner))
|
|
continue;
|
|
|
|
/* see if there are still any locks associated with it */
|
|
lo = lockowner(sop);
|
|
list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
|
|
if (check_for_locks(stp->st_stid.sc_file, lo)) {
|
|
status = nfserr_locks_held;
|
|
spin_unlock(&clp->cl_lock);
|
|
return status;
|
|
}
|
|
}
|
|
|
|
nfs4_get_stateowner(sop);
|
|
break;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
if (lo)
|
|
release_lockowner(lo);
|
|
return status;
|
|
}
|
|
|
|
static inline struct nfs4_client_reclaim *
|
|
alloc_reclaim(void)
|
|
{
|
|
return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
|
|
}
|
|
|
|
bool
|
|
nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
|
|
{
|
|
struct nfs4_client_reclaim *crp;
|
|
|
|
crp = nfsd4_find_reclaim_client(name, nn);
|
|
return (crp && crp->cr_clp);
|
|
}
|
|
|
|
/*
|
|
* failure => all reset bets are off, nfserr_no_grace...
|
|
*/
|
|
struct nfs4_client_reclaim *
|
|
nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
|
|
{
|
|
unsigned int strhashval;
|
|
struct nfs4_client_reclaim *crp;
|
|
|
|
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
|
|
crp = alloc_reclaim();
|
|
if (crp) {
|
|
strhashval = clientstr_hashval(name);
|
|
INIT_LIST_HEAD(&crp->cr_strhash);
|
|
list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
|
|
memcpy(crp->cr_recdir, name, HEXDIR_LEN);
|
|
crp->cr_clp = NULL;
|
|
nn->reclaim_str_hashtbl_size++;
|
|
}
|
|
return crp;
|
|
}
|
|
|
|
void
|
|
nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
|
|
{
|
|
list_del(&crp->cr_strhash);
|
|
kfree(crp);
|
|
nn->reclaim_str_hashtbl_size--;
|
|
}
|
|
|
|
void
|
|
nfs4_release_reclaim(struct nfsd_net *nn)
|
|
{
|
|
struct nfs4_client_reclaim *crp = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
|
|
crp = list_entry(nn->reclaim_str_hashtbl[i].next,
|
|
struct nfs4_client_reclaim, cr_strhash);
|
|
nfs4_remove_reclaim_record(crp, nn);
|
|
}
|
|
}
|
|
WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
|
|
}
|
|
|
|
/*
|
|
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
|
|
struct nfs4_client_reclaim *
|
|
nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
|
|
{
|
|
unsigned int strhashval;
|
|
struct nfs4_client_reclaim *crp = NULL;
|
|
|
|
dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
|
|
|
|
strhashval = clientstr_hashval(recdir);
|
|
list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
|
|
if (same_name(crp->cr_recdir, recdir)) {
|
|
return crp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Called from OPEN. Look for clientid in reclaim list.
|
|
*/
|
|
__be32
|
|
nfs4_check_open_reclaim(clientid_t *clid,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd_net *nn)
|
|
{
|
|
__be32 status;
|
|
|
|
/* find clientid in conf_id_hashtbl */
|
|
status = lookup_clientid(clid, cstate, nn);
|
|
if (status)
|
|
return nfserr_reclaim_bad;
|
|
|
|
if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
|
|
return nfserr_no_grace;
|
|
|
|
if (nfsd4_client_record_check(cstate->clp))
|
|
return nfserr_reclaim_bad;
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
#ifdef CONFIG_NFSD_FAULT_INJECTION
|
|
static inline void
|
|
put_client(struct nfs4_client *clp)
|
|
{
|
|
atomic_dec(&clp->cl_refcount);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return NULL;
|
|
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
|
|
if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_print_clients(void)
|
|
{
|
|
struct nfs4_client *clp;
|
|
u64 count = 0;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
char buf[INET6_ADDRSTRLEN];
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return 0;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
|
|
rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
|
|
pr_info("NFS Client: %s\n", buf);
|
|
++count;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
clp = nfsd_find_client(addr, addr_size);
|
|
if (clp) {
|
|
if (mark_client_expired_locked(clp) == nfs_ok)
|
|
++count;
|
|
else
|
|
clp = NULL;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
if (clp)
|
|
expire_client(clp);
|
|
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_clients(u64 max)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp, *next;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
|
|
if (mark_client_expired_locked(clp) == nfs_ok) {
|
|
list_add(&clp->cl_lru, &reaplist);
|
|
if (max != 0 && ++count >= max)
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
|
|
expire_client(clp);
|
|
|
|
return count;
|
|
}
|
|
|
|
static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
|
|
const char *type)
|
|
{
|
|
char buf[INET6_ADDRSTRLEN];
|
|
rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
|
|
printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
|
|
}
|
|
|
|
static void
|
|
nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
|
|
struct list_head *collect)
|
|
{
|
|
struct nfs4_client *clp = lst->st_stid.sc_client;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!collect)
|
|
return;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
atomic_inc(&clp->cl_refcount);
|
|
list_add(&lst->st_locks, collect);
|
|
}
|
|
|
|
static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
|
|
struct list_head *collect,
|
|
bool (*func)(struct nfs4_ol_stateid *))
|
|
{
|
|
struct nfs4_openowner *oop;
|
|
struct nfs4_ol_stateid *stp, *st_next;
|
|
struct nfs4_ol_stateid *lst, *lst_next;
|
|
u64 count = 0;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
|
|
list_for_each_entry_safe(stp, st_next,
|
|
&oop->oo_owner.so_stateids, st_perstateowner) {
|
|
list_for_each_entry_safe(lst, lst_next,
|
|
&stp->st_locks, st_locks) {
|
|
if (func) {
|
|
if (func(lst))
|
|
nfsd_inject_add_lock_to_list(lst,
|
|
collect);
|
|
}
|
|
++count;
|
|
/*
|
|
* Despite the fact that these functions deal
|
|
* with 64-bit integers for "count", we must
|
|
* ensure that it doesn't blow up the
|
|
* clp->cl_refcount. Throw a warning if we
|
|
* start to approach INT_MAX here.
|
|
*/
|
|
WARN_ON_ONCE(count == (INT_MAX / 2));
|
|
if (count == max)
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static u64
|
|
nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
|
|
u64 max)
|
|
{
|
|
return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
|
|
}
|
|
|
|
static u64
|
|
nfsd_print_client_locks(struct nfs4_client *clp)
|
|
{
|
|
u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
|
|
nfsd_print_count(clp, count, "locked files");
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_print_locks(void)
|
|
{
|
|
struct nfs4_client *clp;
|
|
u64 count = 0;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return 0;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru)
|
|
count += nfsd_print_client_locks(clp);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
nfsd_reap_locks(struct list_head *reaplist)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_ol_stateid *stp, *next;
|
|
|
|
list_for_each_entry_safe(stp, next, reaplist, st_locks) {
|
|
list_del_init(&stp->st_locks);
|
|
clp = stp->st_stid.sc_client;
|
|
nfs4_put_stid(&stp->st_stid);
|
|
put_client(clp);
|
|
}
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
|
|
{
|
|
unsigned int count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
clp = nfsd_find_client(addr, addr_size);
|
|
if (clp)
|
|
count = nfsd_collect_client_locks(clp, &reaplist, 0);
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_reap_locks(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_locks(u64 max)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
|
|
count += nfsd_collect_client_locks(clp, &reaplist, max - count);
|
|
if (max != 0 && count >= max)
|
|
break;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_reap_locks(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
static u64
|
|
nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
|
|
struct list_head *collect,
|
|
void (*func)(struct nfs4_openowner *))
|
|
{
|
|
struct nfs4_openowner *oop, *next;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
u64 count = 0;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
|
|
if (func) {
|
|
func(oop);
|
|
if (collect) {
|
|
atomic_inc(&clp->cl_refcount);
|
|
list_add(&oop->oo_perclient, collect);
|
|
}
|
|
}
|
|
++count;
|
|
/*
|
|
* Despite the fact that these functions deal with
|
|
* 64-bit integers for "count", we must ensure that
|
|
* it doesn't blow up the clp->cl_refcount. Throw a
|
|
* warning if we start to approach INT_MAX here.
|
|
*/
|
|
WARN_ON_ONCE(count == (INT_MAX / 2));
|
|
if (count == max)
|
|
break;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static u64
|
|
nfsd_print_client_openowners(struct nfs4_client *clp)
|
|
{
|
|
u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
|
|
|
|
nfsd_print_count(clp, count, "openowners");
|
|
return count;
|
|
}
|
|
|
|
static u64
|
|
nfsd_collect_client_openowners(struct nfs4_client *clp,
|
|
struct list_head *collect, u64 max)
|
|
{
|
|
return nfsd_foreach_client_openowner(clp, max, collect,
|
|
unhash_openowner_locked);
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_print_openowners(void)
|
|
{
|
|
struct nfs4_client *clp;
|
|
u64 count = 0;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return 0;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru)
|
|
count += nfsd_print_client_openowners(clp);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
nfsd_reap_openowners(struct list_head *reaplist)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_openowner *oop, *next;
|
|
|
|
list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
|
|
list_del_init(&oop->oo_perclient);
|
|
clp = oop->oo_owner.so_client;
|
|
release_openowner(oop);
|
|
put_client(clp);
|
|
}
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
|
|
size_t addr_size)
|
|
{
|
|
unsigned int count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
clp = nfsd_find_client(addr, addr_size);
|
|
if (clp)
|
|
count = nfsd_collect_client_openowners(clp, &reaplist, 0);
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_reap_openowners(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_openowners(u64 max)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
|
|
count += nfsd_collect_client_openowners(clp, &reaplist,
|
|
max - count);
|
|
if (max != 0 && count >= max)
|
|
break;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_reap_openowners(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
|
|
struct list_head *victims)
|
|
{
|
|
struct nfs4_delegation *dp, *next;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
u64 count = 0;
|
|
|
|
lockdep_assert_held(&nn->client_lock);
|
|
|
|
spin_lock(&state_lock);
|
|
list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
|
|
if (victims) {
|
|
/*
|
|
* It's not safe to mess with delegations that have a
|
|
* non-zero dl_time. They might have already been broken
|
|
* and could be processed by the laundromat outside of
|
|
* the state_lock. Just leave them be.
|
|
*/
|
|
if (dp->dl_time != 0)
|
|
continue;
|
|
|
|
atomic_inc(&clp->cl_refcount);
|
|
WARN_ON(!unhash_delegation_locked(dp));
|
|
list_add(&dp->dl_recall_lru, victims);
|
|
}
|
|
++count;
|
|
/*
|
|
* Despite the fact that these functions deal with
|
|
* 64-bit integers for "count", we must ensure that
|
|
* it doesn't blow up the clp->cl_refcount. Throw a
|
|
* warning if we start to approach INT_MAX here.
|
|
*/
|
|
WARN_ON_ONCE(count == (INT_MAX / 2));
|
|
if (count == max)
|
|
break;
|
|
}
|
|
spin_unlock(&state_lock);
|
|
return count;
|
|
}
|
|
|
|
static u64
|
|
nfsd_print_client_delegations(struct nfs4_client *clp)
|
|
{
|
|
u64 count = nfsd_find_all_delegations(clp, 0, NULL);
|
|
|
|
nfsd_print_count(clp, count, "delegations");
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_print_delegations(void)
|
|
{
|
|
struct nfs4_client *clp;
|
|
u64 count = 0;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return 0;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru)
|
|
count += nfsd_print_client_delegations(clp);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
nfsd_forget_delegations(struct list_head *reaplist)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_delegation *dp, *next;
|
|
|
|
list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
|
|
list_del_init(&dp->dl_recall_lru);
|
|
clp = dp->dl_stid.sc_client;
|
|
revoke_delegation(dp);
|
|
put_client(clp);
|
|
}
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
|
|
size_t addr_size)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
clp = nfsd_find_client(addr, addr_size);
|
|
if (clp)
|
|
count = nfsd_find_all_delegations(clp, 0, &reaplist);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
nfsd_forget_delegations(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_forget_delegations(u64 max)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
|
|
count += nfsd_find_all_delegations(clp, max - count, &reaplist);
|
|
if (max != 0 && count >= max)
|
|
break;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_forget_delegations(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
nfsd_recall_delegations(struct list_head *reaplist)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_delegation *dp, *next;
|
|
|
|
list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
|
|
list_del_init(&dp->dl_recall_lru);
|
|
clp = dp->dl_stid.sc_client;
|
|
/*
|
|
* We skipped all entries that had a zero dl_time before,
|
|
* so we can now reset the dl_time back to 0. If a delegation
|
|
* break comes in now, then it won't make any difference since
|
|
* we're recalling it either way.
|
|
*/
|
|
spin_lock(&state_lock);
|
|
dp->dl_time = 0;
|
|
spin_unlock(&state_lock);
|
|
nfsd_break_one_deleg(dp);
|
|
put_client(clp);
|
|
}
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
|
|
size_t addr_size)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
clp = nfsd_find_client(addr, addr_size);
|
|
if (clp)
|
|
count = nfsd_find_all_delegations(clp, 0, &reaplist);
|
|
spin_unlock(&nn->client_lock);
|
|
|
|
nfsd_recall_delegations(&reaplist);
|
|
return count;
|
|
}
|
|
|
|
u64
|
|
nfsd_inject_recall_delegations(u64 max)
|
|
{
|
|
u64 count = 0;
|
|
struct nfs4_client *clp, *next;
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
LIST_HEAD(reaplist);
|
|
|
|
if (!nfsd_netns_ready(nn))
|
|
return count;
|
|
|
|
spin_lock(&nn->client_lock);
|
|
list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
|
|
count += nfsd_find_all_delegations(clp, max - count, &reaplist);
|
|
if (max != 0 && ++count >= max)
|
|
break;
|
|
}
|
|
spin_unlock(&nn->client_lock);
|
|
nfsd_recall_delegations(&reaplist);
|
|
return count;
|
|
}
|
|
#endif /* CONFIG_NFSD_FAULT_INJECTION */
|
|
|
|
/*
|
|
* Since the lifetime of a delegation isn't limited to that of an open, a
|
|
* client may quite reasonably hang on to a delegation as long as it has
|
|
* the inode cached. This becomes an obvious problem the first time a
|
|
* client's inode cache approaches the size of the server's total memory.
|
|
*
|
|
* For now we avoid this problem by imposing a hard limit on the number
|
|
* of delegations, which varies according to the server's memory size.
|
|
*/
|
|
static void
|
|
set_max_delegations(void)
|
|
{
|
|
/*
|
|
* Allow at most 4 delegations per megabyte of RAM. Quick
|
|
* estimates suggest that in the worst case (where every delegation
|
|
* is for a different inode), a delegation could take about 1.5K,
|
|
* giving a worst case usage of about 6% of memory.
|
|
*/
|
|
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
|
|
}
|
|
|
|
static int nfs4_state_create_net(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
int i;
|
|
|
|
nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
|
|
CLIENT_HASH_SIZE, GFP_KERNEL);
|
|
if (!nn->conf_id_hashtbl)
|
|
goto err;
|
|
nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
|
|
CLIENT_HASH_SIZE, GFP_KERNEL);
|
|
if (!nn->unconf_id_hashtbl)
|
|
goto err_unconf_id;
|
|
nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
|
|
SESSION_HASH_SIZE, GFP_KERNEL);
|
|
if (!nn->sessionid_hashtbl)
|
|
goto err_sessionid;
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
|
|
INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
|
|
}
|
|
for (i = 0; i < SESSION_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
|
|
nn->conf_name_tree = RB_ROOT;
|
|
nn->unconf_name_tree = RB_ROOT;
|
|
INIT_LIST_HEAD(&nn->client_lru);
|
|
INIT_LIST_HEAD(&nn->close_lru);
|
|
INIT_LIST_HEAD(&nn->del_recall_lru);
|
|
spin_lock_init(&nn->client_lock);
|
|
|
|
INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
|
|
get_net(net);
|
|
|
|
return 0;
|
|
|
|
err_sessionid:
|
|
kfree(nn->unconf_id_hashtbl);
|
|
err_unconf_id:
|
|
kfree(nn->conf_id_hashtbl);
|
|
err:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void
|
|
nfs4_state_destroy_net(struct net *net)
|
|
{
|
|
int i;
|
|
struct nfs4_client *clp = NULL;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
while (!list_empty(&nn->conf_id_hashtbl[i])) {
|
|
clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
|
|
destroy_client(clp);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
while (!list_empty(&nn->unconf_id_hashtbl[i])) {
|
|
clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
|
|
destroy_client(clp);
|
|
}
|
|
}
|
|
|
|
kfree(nn->sessionid_hashtbl);
|
|
kfree(nn->unconf_id_hashtbl);
|
|
kfree(nn->conf_id_hashtbl);
|
|
put_net(net);
|
|
}
|
|
|
|
int
|
|
nfs4_state_start_net(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
int ret;
|
|
|
|
ret = nfs4_state_create_net(net);
|
|
if (ret)
|
|
return ret;
|
|
nn->boot_time = get_seconds();
|
|
nn->grace_ended = false;
|
|
nn->nfsd4_manager.block_opens = true;
|
|
locks_start_grace(net, &nn->nfsd4_manager);
|
|
nfsd4_client_tracking_init(net);
|
|
printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
|
|
nn->nfsd4_grace, net);
|
|
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
|
|
return 0;
|
|
}
|
|
|
|
/* initialization to perform when the nfsd service is started: */
|
|
|
|
int
|
|
nfs4_state_start(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = set_callback_cred();
|
|
if (ret)
|
|
return -ENOMEM;
|
|
laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
|
|
if (laundry_wq == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out_recovery;
|
|
}
|
|
ret = nfsd4_create_callback_queue();
|
|
if (ret)
|
|
goto out_free_laundry;
|
|
|
|
set_max_delegations();
|
|
|
|
return 0;
|
|
|
|
out_free_laundry:
|
|
destroy_workqueue(laundry_wq);
|
|
out_recovery:
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
nfs4_state_shutdown_net(struct net *net)
|
|
{
|
|
struct nfs4_delegation *dp = NULL;
|
|
struct list_head *pos, *next, reaplist;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
cancel_delayed_work_sync(&nn->laundromat_work);
|
|
locks_end_grace(&nn->nfsd4_manager);
|
|
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&state_lock);
|
|
list_for_each_safe(pos, next, &nn->del_recall_lru) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
WARN_ON(!unhash_delegation_locked(dp));
|
|
list_add(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&state_lock);
|
|
list_for_each_safe(pos, next, &reaplist) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
put_clnt_odstate(dp->dl_clnt_odstate);
|
|
nfs4_put_deleg_lease(dp->dl_stid.sc_file);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
|
|
nfsd4_client_tracking_exit(net);
|
|
nfs4_state_destroy_net(net);
|
|
}
|
|
|
|
void
|
|
nfs4_state_shutdown(void)
|
|
{
|
|
destroy_workqueue(laundry_wq);
|
|
nfsd4_destroy_callback_queue();
|
|
}
|
|
|
|
static void
|
|
get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
|
|
{
|
|
if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
|
|
memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
|
|
}
|
|
|
|
static void
|
|
put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
|
|
{
|
|
if (cstate->minorversion) {
|
|
memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
|
|
SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
|
|
}
|
|
}
|
|
|
|
void
|
|
clear_current_stateid(struct nfsd4_compound_state *cstate)
|
|
{
|
|
CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
|
|
}
|
|
|
|
/*
|
|
* functions to set current state id
|
|
*/
|
|
void
|
|
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
|
|
{
|
|
put_stateid(cstate, &odp->od_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
|
|
{
|
|
put_stateid(cstate, &open->op_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
|
|
{
|
|
put_stateid(cstate, &close->cl_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
|
|
{
|
|
put_stateid(cstate, &lock->lk_resp_stateid);
|
|
}
|
|
|
|
/*
|
|
* functions to consume current state id
|
|
*/
|
|
|
|
void
|
|
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
|
|
{
|
|
get_stateid(cstate, &odp->od_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
|
|
{
|
|
get_stateid(cstate, &drp->dr_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
|
|
{
|
|
get_stateid(cstate, &fsp->fr_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
|
|
{
|
|
get_stateid(cstate, &setattr->sa_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
|
|
{
|
|
get_stateid(cstate, &close->cl_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
|
|
{
|
|
get_stateid(cstate, &locku->lu_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
|
|
{
|
|
get_stateid(cstate, &read->rd_stateid);
|
|
}
|
|
|
|
void
|
|
nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
|
|
{
|
|
get_stateid(cstate, &write->wr_stateid);
|
|
}
|