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![Christoph Hellwig](/assets/img/avatar_default.png)
Add support to issue layout recalls to clients. For now we only support full-file recalls to get a simple and stable implementation. This allows to embedd a nfsd4_callback structure in the layout_state and thus avoid any memory allocations under spinlocks during a recall. For normal use cases that do not intent to share a single file between multiple clients this implementation is fully sufficient. To ensure layouts are recalled on local filesystem access each layout state registers a new FL_LAYOUT lease with the kernel file locking code, which filesystems that support pNFS exports that require recalls need to break on conflicting access patterns. The XDR code is based on the old pNFS server implementation by Andy Adamson, Benny Halevy, Boaz Harrosh, Dean Hildebrand, Fred Isaman, Marc Eshel, Mike Sager and Ricardo Labiaga. Signed-off-by: Christoph Hellwig <hch@lst.de>
6604 lines
168 KiB
C
6604 lines
168 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 void free_session(struct nfsd4_session *);
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static 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_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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|
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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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|
|
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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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|
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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)
|
|
{
|
|
/* 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;
|
|
}
|
|
return nfs_ok;
|
|
}
|
|
|
|
static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
|
|
{
|
|
might_lock(&fp->fi_lock);
|
|
|
|
if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
|
|
struct file *f1 = NULL;
|
|
struct file *f2 = NULL;
|
|
|
|
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]);
|
|
spin_unlock(&fp->fi_lock);
|
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if (f1)
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fput(f1);
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if (f2)
|
|
fput(f2);
|
|
}
|
|
}
|
|
|
|
static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
|
|
{
|
|
WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
|
|
|
|
if (access & NFS4_SHARE_ACCESS_WRITE)
|
|
__nfs4_file_put_access(fp, O_WRONLY);
|
|
if (access & NFS4_SHARE_ACCESS_READ)
|
|
__nfs4_file_put_access(fp, O_RDONLY);
|
|
}
|
|
|
|
struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl,
|
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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);
|
|
|
|
/*
|
|
* 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_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_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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void
|
|
hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
|
|
{
|
|
lockdep_assert_held(&state_lock);
|
|
lockdep_assert_held(&fp->fi_lock);
|
|
|
|
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, &dp->dl_stid.sc_client->cl_delegations);
|
|
}
|
|
|
|
static void
|
|
unhash_delegation_locked(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_file *fp = dp->dl_stid.sc_file;
|
|
|
|
lockdep_assert_held(&state_lock);
|
|
|
|
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);
|
|
}
|
|
|
|
static void destroy_delegation(struct nfs4_delegation *dp)
|
|
{
|
|
spin_lock(&state_lock);
|
|
unhash_delegation_locked(dp);
|
|
spin_unlock(&state_lock);
|
|
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));
|
|
|
|
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 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);
|
|
kfree(sop->so_owner.data);
|
|
sop->so_ops->so_free(sop);
|
|
}
|
|
|
|
static void 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);
|
|
|
|
spin_lock(&fp->fi_lock);
|
|
list_del(&stp->st_perfile);
|
|
spin_unlock(&fp->fi_lock);
|
|
list_del(&stp->st_perstateowner);
|
|
}
|
|
|
|
static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
|
|
{
|
|
struct nfs4_ol_stateid *stp = openlockstateid(stid);
|
|
|
|
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 void 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);
|
|
unhash_ol_stateid(stp);
|
|
nfs4_unhash_stid(&stp->st_stid);
|
|
}
|
|
|
|
static void release_lock_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
|
|
|
|
spin_lock(&oo->oo_owner.so_client->cl_lock);
|
|
unhash_lock_stateid(stp);
|
|
spin_unlock(&oo->oo_owner.so_client->cl_lock);
|
|
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);
|
|
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;
|
|
|
|
while (!list_empty(&open_stp->st_locks)) {
|
|
stp = list_entry(open_stp->st_locks.next,
|
|
struct nfs4_ol_stateid, st_locks);
|
|
unhash_lock_stateid(stp);
|
|
put_ol_stateid_locked(stp, reaplist);
|
|
}
|
|
}
|
|
|
|
static void unhash_open_stateid(struct nfs4_ol_stateid *stp,
|
|
struct list_head *reaplist)
|
|
{
|
|
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
|
|
|
|
unhash_ol_stateid(stp);
|
|
release_open_stateid_locks(stp, reaplist);
|
|
}
|
|
|
|
static void release_open_stateid(struct nfs4_ol_stateid *stp)
|
|
{
|
|
LIST_HEAD(reaplist);
|
|
|
|
spin_lock(&stp->st_stid.sc_client->cl_lock);
|
|
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);
|
|
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 NFSD_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_callbacks);
|
|
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);
|
|
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);
|
|
nfs4_put_deleg_lease(dp->dl_stid.sc_file);
|
|
nfs4_put_stid(&dp->dl_stid);
|
|
}
|
|
while (!list_empty(&clp->cl_revoked)) {
|
|
dp = list_entry(reaplist.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;
|
|
}
|
|
|
|
static int copy_cred(struct svc_cred *target, struct svc_cred *source)
|
|
{
|
|
if (source->cr_principal) {
|
|
target->cr_principal =
|
|
kstrdup(source->cr_principal, GFP_KERNEL);
|
|
if (target->cr_principal == NULL)
|
|
return -ENOMEM;
|
|
} else
|
|
target->cr_principal = NULL;
|
|
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 (!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->clientid_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("%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_state(struct nfs4_client *clp)
|
|
{
|
|
/*
|
|
* Note clp->cl_openowners check isn't quite right: there's no
|
|
* need to count owners without stateid's.
|
|
*
|
|
* Also note we should probably be using this in 4.0 case too.
|
|
*/
|
|
return !list_empty(&clp->cl_openowners)
|
|
|| !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;
|
|
|
|
switch (exid->spa_how) {
|
|
case SP4_MACH_CRED:
|
|
if (!svc_rqst_integrity_protected(rqstp))
|
|
return nfserr_inval;
|
|
case SP4_NONE:
|
|
break;
|
|
default: /* checked by xdr code */
|
|
WARN_ON_ONCE(1);
|
|
case SP4_SSV:
|
|
return nfserr_encr_alg_unsupp;
|
|
}
|
|
|
|
new = create_client(exid->clname, rqstp, &verf);
|
|
if (new == NULL)
|
|
return nfserr_jukebox;
|
|
|
|
/* 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;
|
|
new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
|
|
|
|
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);
|
|
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;
|
|
}
|
|
|
|
#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
|
|
RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
|
|
#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
|
|
RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
|
|
|
|
static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
|
|
{
|
|
ca->headerpadsz = 0;
|
|
|
|
/*
|
|
* These RPC_MAX_HEADER macros are overkill, especially since we
|
|
* don't even do gss on the backchannel yet. But this is still
|
|
* less than 1k. Tighten up this estimate in the unlikely event
|
|
* it turns out to be a problem for some client:
|
|
*/
|
|
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 == nfserr_replay_cache) {
|
|
status = nfsd4_replay_create_session(cr_ses, cs_slot);
|
|
goto out_free_conn;
|
|
} else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
|
|
status = nfserr_seq_misordered;
|
|
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;
|
|
/*
|
|
* We do not support RDMA or persistent sessions
|
|
*/
|
|
cr_ses->flags &= ~SESSION4_PERSIST;
|
|
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) {
|
|
/* 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);
|
|
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,
|
|
* there's a bug somewhere. Let's charitably assume it's our
|
|
* bug.
|
|
*/
|
|
status = nfserr_serverfault;
|
|
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 = 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);
|
|
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(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;
|
|
return 0;
|
|
|
|
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_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_openowner(&oo->oo_owner);
|
|
spin_unlock(&clp->cl_lock);
|
|
return oo;
|
|
}
|
|
|
|
static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
|
|
struct nfs4_openowner *oo = open->op_openowner;
|
|
|
|
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;
|
|
spin_lock(&oo->oo_owner.so_client->cl_lock);
|
|
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
|
|
spin_lock(&fp->fi_lock);
|
|
list_add(&stp->st_perfile, &fp->fi_stateids);
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&oo->oo_owner.so_client->cl_lock);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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 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;
|
|
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 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;
|
|
|
|
spin_lock(&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;
|
|
}
|
|
}
|
|
spin_unlock(&fp->fi_lock);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
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) {
|
|
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);
|
|
}
|
|
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;
|
|
}
|
|
|
|
static void
|
|
nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
|
|
{
|
|
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static int nfs4_setlease(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_file *fp = dp->dl_stid.sc_file;
|
|
struct file_lock *fl, *ret;
|
|
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);
|
|
return -EBADF;
|
|
}
|
|
fl->fl_file = filp;
|
|
ret = fl;
|
|
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 = 0;
|
|
++fp->fi_delegees;
|
|
hash_delegation_locked(dp, fp);
|
|
goto out_unlock;
|
|
}
|
|
fp->fi_deleg_file = filp;
|
|
fp->fi_delegees = 1;
|
|
hash_delegation_locked(dp, fp);
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
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)
|
|
{
|
|
int status;
|
|
struct nfs4_delegation *dp;
|
|
|
|
if (fp->fi_had_conflict)
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
dp = alloc_init_deleg(clp, fh);
|
|
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;
|
|
}
|
|
++fp->fi_delegees;
|
|
hash_delegation_locked(dp, fp);
|
|
status = 0;
|
|
out_unlock:
|
|
spin_unlock(&fp->fi_lock);
|
|
spin_unlock(&state_lock);
|
|
out:
|
|
if (status) {
|
|
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....
|
|
*/
|
|
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);
|
|
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_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;
|
|
stp = nfsd4_find_existing_open(fp, open);
|
|
} else {
|
|
open->op_file = NULL;
|
|
status = nfserr_bad_stateid;
|
|
if (nfsd4_is_deleg_cur(open))
|
|
goto out;
|
|
status = nfserr_jukebox;
|
|
}
|
|
|
|
/*
|
|
* OPEN the file, or upgrade an existing OPEN.
|
|
* If truncate fails, the OPEN fails.
|
|
*/
|
|
if (stp) {
|
|
/* Stateid was found, this is an OPEN upgrade */
|
|
status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
|
|
if (status)
|
|
goto out;
|
|
} else {
|
|
stp = open->op_stp;
|
|
open->op_stp = NULL;
|
|
init_open_stateid(stp, fp, open);
|
|
status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
|
|
if (status) {
|
|
release_open_stateid(stp);
|
|
goto out;
|
|
}
|
|
}
|
|
update_stateid(&stp->st_stid.sc_stateid);
|
|
memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
|
|
|
|
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)
|
|
nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
|
|
/*
|
|
* 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, __be32 status)
|
|
{
|
|
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);
|
|
}
|
|
|
|
__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 (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
|
|
continue;
|
|
if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
|
|
t = dp->dl_time - cutoff;
|
|
new_timeo = min(new_timeo, t);
|
|
break;
|
|
}
|
|
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 = container_of(laundry, struct delayed_work,
|
|
work);
|
|
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_ol_stateid *stp)
|
|
{
|
|
if (!fh_match(&fhp->fh_handle, &stp->st_stid.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 (locks_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 locks_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_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
|
|
{
|
|
struct nfs4_stid *s;
|
|
struct nfs4_ol_stateid *ols;
|
|
__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:
|
|
ols = openlockstateid(s);
|
|
if (ols->st_stateowner->so_is_open_owner
|
|
&& !(openowner(ols->st_stateowner)->oo_flags
|
|
& NFS4_OO_CONFIRMED))
|
|
status = nfserr_bad_stateid;
|
|
else
|
|
status = nfs_ok;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Checks for stateid operations
|
|
*/
|
|
__be32
|
|
nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
|
|
stateid_t *stateid, int flags, struct file **filpp)
|
|
{
|
|
struct nfs4_stid *s;
|
|
struct nfs4_ol_stateid *stp = NULL;
|
|
struct nfs4_delegation *dp = NULL;
|
|
struct svc_fh *current_fh = &cstate->current_fh;
|
|
struct inode *ino = current_fh->fh_dentry->d_inode;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct file *file = NULL;
|
|
__be32 status;
|
|
|
|
if (filpp)
|
|
*filpp = NULL;
|
|
|
|
if (grace_disallows_io(net, ino))
|
|
return nfserr_grace;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
|
|
return check_special_stateids(net, current_fh, stateid, flags);
|
|
|
|
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:
|
|
dp = delegstateid(s);
|
|
status = nfs4_check_delegmode(dp, flags);
|
|
if (status)
|
|
goto out;
|
|
if (filpp) {
|
|
file = dp->dl_stid.sc_file->fi_deleg_file;
|
|
if (!file) {
|
|
WARN_ON_ONCE(1);
|
|
status = nfserr_serverfault;
|
|
goto out;
|
|
}
|
|
get_file(file);
|
|
}
|
|
break;
|
|
case NFS4_OPEN_STID:
|
|
case NFS4_LOCK_STID:
|
|
stp = openlockstateid(s);
|
|
status = nfs4_check_fh(current_fh, stp);
|
|
if (status)
|
|
goto out;
|
|
if (stp->st_stateowner->so_is_open_owner
|
|
&& !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
|
|
goto out;
|
|
status = nfs4_check_openmode(stp, flags);
|
|
if (status)
|
|
goto out;
|
|
if (filpp) {
|
|
struct nfs4_file *fp = stp->st_stid.sc_file;
|
|
|
|
if (flags & RD_STATE)
|
|
file = find_readable_file(fp);
|
|
else
|
|
file = find_writeable_file(fp);
|
|
}
|
|
break;
|
|
default:
|
|
status = nfserr_bad_stateid;
|
|
goto out;
|
|
}
|
|
status = nfs_ok;
|
|
if (file)
|
|
*filpp = file;
|
|
out:
|
|
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;
|
|
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;
|
|
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
|
|
if (status)
|
|
return status;
|
|
return nfs4_check_fh(current_fh, stp);
|
|
}
|
|
|
|
/*
|
|
* 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)) {
|
|
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)
|
|
goto put_stateid;
|
|
oo->oo_flags |= NFS4_OO_CONFIRMED;
|
|
update_stateid(&stp->st_stid.sc_stateid);
|
|
memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
|
|
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);
|
|
|
|
update_stateid(&stp->st_stid.sc_stateid);
|
|
memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
|
|
status = nfs_ok;
|
|
put_stateid:
|
|
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;
|
|
LIST_HEAD(reaplist);
|
|
|
|
s->st_stid.sc_type = NFS4_CLOSED_STID;
|
|
spin_lock(&clp->cl_lock);
|
|
unhash_open_stateid(s, &reaplist);
|
|
|
|
if (clp->cl_minorversion) {
|
|
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);
|
|
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;
|
|
update_stateid(&stp->st_stid.sc_stateid);
|
|
memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
|
|
|
|
nfsd4_return_all_file_layouts(stp->st_stateowner->so_client,
|
|
stp->st_stid.sc_file);
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
|
|
|
|
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 void nfsd4_fl_get_owner(struct file_lock *dst, struct file_lock *src)
|
|
{
|
|
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)src->fl_owner;
|
|
dst->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lo->lo_owner));
|
|
}
|
|
|
|
static void nfsd4_fl_put_owner(struct file_lock *fl)
|
|
{
|
|
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
|
|
|
|
if (lo) {
|
|
nfs4_put_stateowner(&lo->lo_owner);
|
|
fl->fl_owner = NULL;
|
|
}
|
|
}
|
|
|
|
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(clientid_t *clid, struct xdr_netobj *owner,
|
|
struct nfs4_client *clp)
|
|
{
|
|
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(clientid_t *clid, struct xdr_netobj *owner,
|
|
struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_lockowner *lo;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
lo = find_lockowner_str_locked(clid, owner, clp);
|
|
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->cl_clientid,
|
|
&lock->lk_new_owner, clp);
|
|
if (ret == NULL) {
|
|
list_add(&lo->lo_owner.so_strhash,
|
|
&clp->cl_ownerstr_hashtbl[strhashval]);
|
|
ret = lo;
|
|
} else
|
|
nfs4_free_lockowner(&lo->lo_owner);
|
|
spin_unlock(&clp->cl_lock);
|
|
return lo;
|
|
}
|
|
|
|
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;
|
|
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) &&
|
|
LOFF_OVERFLOW(offset, length)));
|
|
}
|
|
|
|
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 = cstate->current_fh.fh_dentry->d_inode;
|
|
struct nfs4_lockowner *lo;
|
|
unsigned int strhashval;
|
|
|
|
lo = find_lockowner_str(&cl->cl_clientid, &lock->v.new.owner, cl);
|
|
if (!lo) {
|
|
strhashval = ownerstr_hashval(&lock->v.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->v.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;
|
|
open_sop = openowner(open_stp->st_stateowner);
|
|
status = nfserr_bad_stateid;
|
|
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
|
|
&lock->v.new.clientid))
|
|
goto out;
|
|
status = lookup_or_create_lock_state(cstate, open_stp, lock,
|
|
&lock_stp, &new);
|
|
} 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! */
|
|
update_stateid(&lock_stp->st_stid.sc_stateid);
|
|
memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
|
|
sizeof(stateid_t));
|
|
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++;
|
|
|
|
/*
|
|
* 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));
|
|
nfsd_close(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(&lockt->lt_clientid, &lockt->lt_owner,
|
|
cstate->clp);
|
|
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;
|
|
}
|
|
update_stateid(&stp->st_stid.sc_stateid);
|
|
memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
|
|
fput:
|
|
fput(filp);
|
|
put_stateid:
|
|
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,
|
|
void (*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) {
|
|
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);
|
|
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;
|
|
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 = create_singlethread_workqueue("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);
|
|
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);
|
|
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);
|
|
}
|