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![Chuck Lever](/assets/img/avatar_default.png)
Currently, we're only memcpy'ing the first __be32. Ensure we copy into
both words.
Fixes: 91d2e9b56c
("NFSD: Clean up the nfsd_net::nfssvc_boot field")
Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
1144 lines
28 KiB
C
1144 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Central processing for nfsd.
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*
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* Authors: Olaf Kirch (okir@monad.swb.de)
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*
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/sched/signal.h>
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#include <linux/freezer.h>
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#include <linux/module.h>
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#include <linux/fs_struct.h>
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#include <linux/swap.h>
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#include <linux/siphash.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include <linux/lockd/bind.h>
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#include <linux/nfsacl.h>
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#include <linux/seq_file.h>
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#include <linux/inetdevice.h>
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#include <net/addrconf.h>
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#include <net/ipv6.h>
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#include <net/net_namespace.h>
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#include "nfsd.h"
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#include "cache.h"
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#include "vfs.h"
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#include "netns.h"
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#include "filecache.h"
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#include "trace.h"
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#define NFSDDBG_FACILITY NFSDDBG_SVC
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extern struct svc_program nfsd_program;
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static int nfsd(void *vrqstp);
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#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
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static int nfsd_acl_rpcbind_set(struct net *,
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const struct svc_program *,
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u32, int,
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unsigned short,
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unsigned short);
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static __be32 nfsd_acl_init_request(struct svc_rqst *,
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const struct svc_program *,
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struct svc_process_info *);
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#endif
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static int nfsd_rpcbind_set(struct net *,
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const struct svc_program *,
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u32, int,
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unsigned short,
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unsigned short);
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static __be32 nfsd_init_request(struct svc_rqst *,
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const struct svc_program *,
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struct svc_process_info *);
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/*
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* nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and some members
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* of the svc_serv struct such as ->sv_temp_socks and ->sv_permsocks.
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*
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* If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a
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* properly initialised 'struct svc_serv' with ->sv_nrthreads > 0 (unless
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* nn->keep_active is set). That number of nfsd threads must
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* exist and each must be listed in ->sp_all_threads in some entry of
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* ->sv_pools[].
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*
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* Each active thread holds a counted reference on nn->nfsd_serv, as does
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* the nn->keep_active flag and various transient calls to svc_get().
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*
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* Finally, the nfsd_mutex also protects some of the global variables that are
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* accessed when nfsd starts and that are settable via the write_* routines in
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* nfsctl.c. In particular:
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*
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* user_recovery_dirname
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* user_lease_time
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* nfsd_versions
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*/
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DEFINE_MUTEX(nfsd_mutex);
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/*
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* nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
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* nfsd_drc_max_pages limits the total amount of memory available for
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* version 4.1 DRC caches.
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* nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
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*/
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DEFINE_SPINLOCK(nfsd_drc_lock);
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unsigned long nfsd_drc_max_mem;
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unsigned long nfsd_drc_mem_used;
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#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
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static struct svc_stat nfsd_acl_svcstats;
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static const struct svc_version *nfsd_acl_version[] = {
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# if defined(CONFIG_NFSD_V2_ACL)
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[2] = &nfsd_acl_version2,
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# endif
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# if defined(CONFIG_NFSD_V3_ACL)
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[3] = &nfsd_acl_version3,
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# endif
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};
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#define NFSD_ACL_MINVERS 2
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#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
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static struct svc_program nfsd_acl_program = {
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.pg_prog = NFS_ACL_PROGRAM,
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.pg_nvers = NFSD_ACL_NRVERS,
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.pg_vers = nfsd_acl_version,
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.pg_name = "nfsacl",
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.pg_class = "nfsd",
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.pg_stats = &nfsd_acl_svcstats,
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.pg_authenticate = &svc_set_client,
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.pg_init_request = nfsd_acl_init_request,
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.pg_rpcbind_set = nfsd_acl_rpcbind_set,
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};
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static struct svc_stat nfsd_acl_svcstats = {
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.program = &nfsd_acl_program,
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};
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#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
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static const struct svc_version *nfsd_version[] = {
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#if defined(CONFIG_NFSD_V2)
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[2] = &nfsd_version2,
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#endif
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[3] = &nfsd_version3,
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#if defined(CONFIG_NFSD_V4)
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[4] = &nfsd_version4,
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#endif
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};
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#define NFSD_MINVERS 2
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#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
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struct svc_program nfsd_program = {
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#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
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.pg_next = &nfsd_acl_program,
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#endif
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.pg_prog = NFS_PROGRAM, /* program number */
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.pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
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.pg_vers = nfsd_version, /* version table */
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.pg_name = "nfsd", /* program name */
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.pg_class = "nfsd", /* authentication class */
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.pg_stats = &nfsd_svcstats, /* version table */
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.pg_authenticate = &svc_set_client, /* export authentication */
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.pg_init_request = nfsd_init_request,
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.pg_rpcbind_set = nfsd_rpcbind_set,
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};
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static bool
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nfsd_support_version(int vers)
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{
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if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS)
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return nfsd_version[vers] != NULL;
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return false;
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}
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static bool *
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nfsd_alloc_versions(void)
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{
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bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL);
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unsigned i;
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if (vers) {
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/* All compiled versions are enabled by default */
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for (i = 0; i < NFSD_NRVERS; i++)
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vers[i] = nfsd_support_version(i);
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}
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return vers;
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}
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static bool *
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nfsd_alloc_minorversions(void)
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{
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bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1,
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sizeof(bool), GFP_KERNEL);
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unsigned i;
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if (vers) {
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/* All minor versions are enabled by default */
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for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
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vers[i] = nfsd_support_version(4);
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}
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return vers;
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}
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void
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nfsd_netns_free_versions(struct nfsd_net *nn)
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{
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kfree(nn->nfsd_versions);
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kfree(nn->nfsd4_minorversions);
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nn->nfsd_versions = NULL;
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nn->nfsd4_minorversions = NULL;
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}
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static void
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nfsd_netns_init_versions(struct nfsd_net *nn)
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{
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if (!nn->nfsd_versions) {
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nn->nfsd_versions = nfsd_alloc_versions();
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nn->nfsd4_minorversions = nfsd_alloc_minorversions();
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if (!nn->nfsd_versions || !nn->nfsd4_minorversions)
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nfsd_netns_free_versions(nn);
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}
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}
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int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change)
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{
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if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
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return 0;
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switch(change) {
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case NFSD_SET:
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if (nn->nfsd_versions)
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nn->nfsd_versions[vers] = nfsd_support_version(vers);
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break;
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case NFSD_CLEAR:
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nfsd_netns_init_versions(nn);
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if (nn->nfsd_versions)
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nn->nfsd_versions[vers] = false;
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break;
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case NFSD_TEST:
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if (nn->nfsd_versions)
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return nn->nfsd_versions[vers];
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fallthrough;
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case NFSD_AVAIL:
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return nfsd_support_version(vers);
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}
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return 0;
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}
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static void
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nfsd_adjust_nfsd_versions4(struct nfsd_net *nn)
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{
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unsigned i;
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for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) {
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if (nn->nfsd4_minorversions[i])
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return;
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}
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nfsd_vers(nn, 4, NFSD_CLEAR);
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}
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int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change)
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{
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if (minorversion > NFSD_SUPPORTED_MINOR_VERSION &&
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change != NFSD_AVAIL)
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return -1;
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switch(change) {
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case NFSD_SET:
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if (nn->nfsd4_minorversions) {
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nfsd_vers(nn, 4, NFSD_SET);
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nn->nfsd4_minorversions[minorversion] =
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nfsd_vers(nn, 4, NFSD_TEST);
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}
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break;
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case NFSD_CLEAR:
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nfsd_netns_init_versions(nn);
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if (nn->nfsd4_minorversions) {
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nn->nfsd4_minorversions[minorversion] = false;
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nfsd_adjust_nfsd_versions4(nn);
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}
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break;
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case NFSD_TEST:
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if (nn->nfsd4_minorversions)
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return nn->nfsd4_minorversions[minorversion];
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return nfsd_vers(nn, 4, NFSD_TEST);
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case NFSD_AVAIL:
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return minorversion <= NFSD_SUPPORTED_MINOR_VERSION &&
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nfsd_vers(nn, 4, NFSD_AVAIL);
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}
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return 0;
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}
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/*
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* Maximum number of nfsd processes
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*/
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#define NFSD_MAXSERVS 8192
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int nfsd_nrthreads(struct net *net)
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{
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int rv = 0;
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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mutex_lock(&nfsd_mutex);
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if (nn->nfsd_serv)
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rv = nn->nfsd_serv->sv_nrthreads;
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mutex_unlock(&nfsd_mutex);
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return rv;
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}
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static int nfsd_init_socks(struct net *net, const struct cred *cred)
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{
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int error;
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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if (!list_empty(&nn->nfsd_serv->sv_permsocks))
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return 0;
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error = svc_xprt_create(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT,
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SVC_SOCK_DEFAULTS, cred);
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if (error < 0)
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return error;
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error = svc_xprt_create(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT,
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SVC_SOCK_DEFAULTS, cred);
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if (error < 0)
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return error;
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return 0;
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}
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static int nfsd_users = 0;
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static int nfsd_startup_generic(void)
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{
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int ret;
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if (nfsd_users++)
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return 0;
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ret = nfsd_file_cache_init();
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if (ret)
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goto dec_users;
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ret = nfs4_state_start();
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if (ret)
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goto out_file_cache;
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return 0;
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out_file_cache:
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nfsd_file_cache_shutdown();
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dec_users:
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nfsd_users--;
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return ret;
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}
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static void nfsd_shutdown_generic(void)
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{
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if (--nfsd_users)
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return;
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nfs4_state_shutdown();
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nfsd_file_cache_shutdown();
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}
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static bool nfsd_needs_lockd(struct nfsd_net *nn)
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{
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return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
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}
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/**
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* nfsd_copy_write_verifier - Atomically copy a write verifier
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* @verf: buffer in which to receive the verifier cookie
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* @nn: NFS net namespace
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*
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* This function provides a wait-free mechanism for copying the
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* namespace's write verifier without tearing it.
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*/
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void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn)
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{
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int seq = 0;
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do {
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read_seqbegin_or_lock(&nn->writeverf_lock, &seq);
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memcpy(verf, nn->writeverf, sizeof(nn->writeverf));
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} while (need_seqretry(&nn->writeverf_lock, seq));
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done_seqretry(&nn->writeverf_lock, seq);
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}
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static void nfsd_reset_write_verifier_locked(struct nfsd_net *nn)
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{
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struct timespec64 now;
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u64 verf;
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/*
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* Because the time value is hashed, y2038 time_t overflow
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* is irrelevant in this usage.
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*/
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ktime_get_raw_ts64(&now);
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verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key);
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memcpy(nn->writeverf, &verf, sizeof(nn->writeverf));
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}
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|
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/**
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* nfsd_reset_write_verifier - Generate a new write verifier
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* @nn: NFS net namespace
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*
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* This function updates the ->writeverf field of @nn. This field
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* contains an opaque cookie that, according to Section 18.32.3 of
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* RFC 8881, "the client can use to determine whether a server has
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* changed instance state (e.g., server restart) between a call to
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* WRITE and a subsequent call to either WRITE or COMMIT. This
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* cookie MUST be unchanged during a single instance of the NFSv4.1
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* server and MUST be unique between instances of the NFSv4.1
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* server."
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*/
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void nfsd_reset_write_verifier(struct nfsd_net *nn)
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{
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write_seqlock(&nn->writeverf_lock);
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nfsd_reset_write_verifier_locked(nn);
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write_sequnlock(&nn->writeverf_lock);
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}
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|
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static int nfsd_startup_net(struct net *net, const struct cred *cred)
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{
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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int ret;
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|
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if (nn->nfsd_net_up)
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return 0;
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|
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ret = nfsd_startup_generic();
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if (ret)
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return ret;
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ret = nfsd_init_socks(net, cred);
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if (ret)
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goto out_socks;
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|
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if (nfsd_needs_lockd(nn) && !nn->lockd_up) {
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ret = lockd_up(net, cred);
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if (ret)
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goto out_socks;
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nn->lockd_up = true;
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|
}
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|
|
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ret = nfsd_file_cache_start_net(net);
|
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if (ret)
|
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goto out_lockd;
|
|
|
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ret = nfsd_reply_cache_init(nn);
|
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if (ret)
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goto out_filecache;
|
|
|
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ret = nfs4_state_start_net(net);
|
|
if (ret)
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goto out_reply_cache;
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|
|
|
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
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|
nfsd4_ssc_init_umount_work(nn);
|
|
#endif
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nn->nfsd_net_up = true;
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return 0;
|
|
|
|
out_reply_cache:
|
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nfsd_reply_cache_shutdown(nn);
|
|
out_filecache:
|
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nfsd_file_cache_shutdown_net(net);
|
|
out_lockd:
|
|
if (nn->lockd_up) {
|
|
lockd_down(net);
|
|
nn->lockd_up = false;
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|
}
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|
out_socks:
|
|
nfsd_shutdown_generic();
|
|
return ret;
|
|
}
|
|
|
|
static void nfsd_shutdown_net(struct net *net)
|
|
{
|
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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|
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nfs4_state_shutdown_net(net);
|
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nfsd_reply_cache_shutdown(nn);
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nfsd_file_cache_shutdown_net(net);
|
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if (nn->lockd_up) {
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lockd_down(net);
|
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nn->lockd_up = false;
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}
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nn->nfsd_net_up = false;
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nfsd_shutdown_generic();
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}
|
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|
|
static DEFINE_SPINLOCK(nfsd_notifier_lock);
|
|
static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
|
|
struct net_device *dev = ifa->ifa_dev->dev;
|
|
struct net *net = dev_net(dev);
|
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
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struct sockaddr_in sin;
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|
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if (event != NETDEV_DOWN || !nn->nfsd_serv)
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goto out;
|
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|
|
spin_lock(&nfsd_notifier_lock);
|
|
if (nn->nfsd_serv) {
|
|
dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = ifa->ifa_local;
|
|
svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin);
|
|
}
|
|
spin_unlock(&nfsd_notifier_lock);
|
|
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nfsd_inetaddr_notifier = {
|
|
.notifier_call = nfsd_inetaddr_event,
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int nfsd_inet6addr_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
|
|
struct net_device *dev = ifa->idev->dev;
|
|
struct net *net = dev_net(dev);
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct sockaddr_in6 sin6;
|
|
|
|
if (event != NETDEV_DOWN || !nn->nfsd_serv)
|
|
goto out;
|
|
|
|
spin_lock(&nfsd_notifier_lock);
|
|
if (nn->nfsd_serv) {
|
|
dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = ifa->addr;
|
|
if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
|
|
sin6.sin6_scope_id = ifa->idev->dev->ifindex;
|
|
svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6);
|
|
}
|
|
spin_unlock(&nfsd_notifier_lock);
|
|
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nfsd_inet6addr_notifier = {
|
|
.notifier_call = nfsd_inet6addr_event,
|
|
};
|
|
#endif
|
|
|
|
/* Only used under nfsd_mutex, so this atomic may be overkill: */
|
|
static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0);
|
|
|
|
static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
/* check if the notifier still has clients */
|
|
if (atomic_dec_return(&nfsd_notifier_refcount) == 0) {
|
|
unregister_inetaddr_notifier(&nfsd_inetaddr_notifier);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
unregister_inet6addr_notifier(&nfsd_inet6addr_notifier);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* write_ports can create the server without actually starting
|
|
* any threads--if we get shut down before any threads are
|
|
* started, then nfsd_last_thread will be run before any of this
|
|
* other initialization has been done except the rpcb information.
|
|
*/
|
|
svc_rpcb_cleanup(serv, net);
|
|
if (!nn->nfsd_net_up)
|
|
return;
|
|
|
|
nfsd_shutdown_net(net);
|
|
pr_info("nfsd: last server has exited, flushing export cache\n");
|
|
nfsd_export_flush(net);
|
|
}
|
|
|
|
void nfsd_reset_versions(struct nfsd_net *nn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NFSD_NRVERS; i++)
|
|
if (nfsd_vers(nn, i, NFSD_TEST))
|
|
return;
|
|
|
|
for (i = 0; i < NFSD_NRVERS; i++)
|
|
if (i != 4)
|
|
nfsd_vers(nn, i, NFSD_SET);
|
|
else {
|
|
int minor = 0;
|
|
while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0)
|
|
minor++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Each session guarantees a negotiated per slot memory cache for replies
|
|
* which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
|
|
* NFSv4.1 server might want to use more memory for a DRC than a machine
|
|
* with mutiple services.
|
|
*
|
|
* Impose a hard limit on the number of pages for the DRC which varies
|
|
* according to the machines free pages. This is of course only a default.
|
|
*
|
|
* For now this is a #defined shift which could be under admin control
|
|
* in the future.
|
|
*/
|
|
static void set_max_drc(void)
|
|
{
|
|
#define NFSD_DRC_SIZE_SHIFT 7
|
|
nfsd_drc_max_mem = (nr_free_buffer_pages()
|
|
>> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
|
|
nfsd_drc_mem_used = 0;
|
|
dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
|
|
}
|
|
|
|
static int nfsd_get_default_max_blksize(void)
|
|
{
|
|
struct sysinfo i;
|
|
unsigned long long target;
|
|
unsigned long ret;
|
|
|
|
si_meminfo(&i);
|
|
target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
|
|
/*
|
|
* Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
|
|
* machines, but only uses 32K on 128M machines. Bottom out at
|
|
* 8K on 32M and smaller. Of course, this is only a default.
|
|
*/
|
|
target >>= 12;
|
|
|
|
ret = NFSSVC_MAXBLKSIZE;
|
|
while (ret > target && ret >= 8*1024*2)
|
|
ret /= 2;
|
|
return ret;
|
|
}
|
|
|
|
void nfsd_shutdown_threads(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct svc_serv *serv;
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
serv = nn->nfsd_serv;
|
|
if (serv == NULL) {
|
|
mutex_unlock(&nfsd_mutex);
|
|
return;
|
|
}
|
|
|
|
svc_get(serv);
|
|
/* Kill outstanding nfsd threads */
|
|
svc_set_num_threads(serv, NULL, 0);
|
|
nfsd_put(net);
|
|
mutex_unlock(&nfsd_mutex);
|
|
}
|
|
|
|
bool i_am_nfsd(void)
|
|
{
|
|
return kthread_func(current) == nfsd;
|
|
}
|
|
|
|
int nfsd_create_serv(struct net *net)
|
|
{
|
|
int error;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct svc_serv *serv;
|
|
|
|
WARN_ON(!mutex_is_locked(&nfsd_mutex));
|
|
if (nn->nfsd_serv) {
|
|
svc_get(nn->nfsd_serv);
|
|
return 0;
|
|
}
|
|
if (nfsd_max_blksize == 0)
|
|
nfsd_max_blksize = nfsd_get_default_max_blksize();
|
|
nfsd_reset_versions(nn);
|
|
serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, nfsd);
|
|
if (serv == NULL)
|
|
return -ENOMEM;
|
|
|
|
serv->sv_maxconn = nn->max_connections;
|
|
error = svc_bind(serv, net);
|
|
if (error < 0) {
|
|
/* NOT nfsd_put() as notifiers (see below) haven't
|
|
* been set up yet.
|
|
*/
|
|
svc_put(serv);
|
|
return error;
|
|
}
|
|
spin_lock(&nfsd_notifier_lock);
|
|
nn->nfsd_serv = serv;
|
|
spin_unlock(&nfsd_notifier_lock);
|
|
|
|
set_max_drc();
|
|
/* check if the notifier is already set */
|
|
if (atomic_inc_return(&nfsd_notifier_refcount) == 1) {
|
|
register_inetaddr_notifier(&nfsd_inetaddr_notifier);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
register_inet6addr_notifier(&nfsd_inet6addr_notifier);
|
|
#endif
|
|
}
|
|
nfsd_reset_write_verifier(nn);
|
|
return 0;
|
|
}
|
|
|
|
int nfsd_nrpools(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (nn->nfsd_serv == NULL)
|
|
return 0;
|
|
else
|
|
return nn->nfsd_serv->sv_nrpools;
|
|
}
|
|
|
|
int nfsd_get_nrthreads(int n, int *nthreads, struct net *net)
|
|
{
|
|
int i = 0;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (nn->nfsd_serv != NULL) {
|
|
for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++)
|
|
nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This is the callback for kref_put() below.
|
|
* There is no code here as the first thing to be done is
|
|
* call svc_shutdown_net(), but we cannot get the 'net' from
|
|
* the kref. So do all the work when kref_put returns true.
|
|
*/
|
|
static void nfsd_noop(struct kref *ref)
|
|
{
|
|
}
|
|
|
|
void nfsd_put(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (kref_put(&nn->nfsd_serv->sv_refcnt, nfsd_noop)) {
|
|
svc_xprt_destroy_all(nn->nfsd_serv, net);
|
|
nfsd_last_thread(nn->nfsd_serv, net);
|
|
svc_destroy(&nn->nfsd_serv->sv_refcnt);
|
|
spin_lock(&nfsd_notifier_lock);
|
|
nn->nfsd_serv = NULL;
|
|
spin_unlock(&nfsd_notifier_lock);
|
|
}
|
|
}
|
|
|
|
int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
|
|
{
|
|
int i = 0;
|
|
int tot = 0;
|
|
int err = 0;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
WARN_ON(!mutex_is_locked(&nfsd_mutex));
|
|
|
|
if (nn->nfsd_serv == NULL || n <= 0)
|
|
return 0;
|
|
|
|
if (n > nn->nfsd_serv->sv_nrpools)
|
|
n = nn->nfsd_serv->sv_nrpools;
|
|
|
|
/* enforce a global maximum number of threads */
|
|
tot = 0;
|
|
for (i = 0; i < n; i++) {
|
|
nthreads[i] = min(nthreads[i], NFSD_MAXSERVS);
|
|
tot += nthreads[i];
|
|
}
|
|
if (tot > NFSD_MAXSERVS) {
|
|
/* total too large: scale down requested numbers */
|
|
for (i = 0; i < n && tot > 0; i++) {
|
|
int new = nthreads[i] * NFSD_MAXSERVS / tot;
|
|
tot -= (nthreads[i] - new);
|
|
nthreads[i] = new;
|
|
}
|
|
for (i = 0; i < n && tot > 0; i++) {
|
|
nthreads[i]--;
|
|
tot--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* There must always be a thread in pool 0; the admin
|
|
* can't shut down NFS completely using pool_threads.
|
|
*/
|
|
if (nthreads[0] == 0)
|
|
nthreads[0] = 1;
|
|
|
|
/* apply the new numbers */
|
|
svc_get(nn->nfsd_serv);
|
|
for (i = 0; i < n; i++) {
|
|
err = svc_set_num_threads(nn->nfsd_serv,
|
|
&nn->nfsd_serv->sv_pools[i],
|
|
nthreads[i]);
|
|
if (err)
|
|
break;
|
|
}
|
|
nfsd_put(net);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Adjust the number of threads and return the new number of threads.
|
|
* This is also the function that starts the server if necessary, if
|
|
* this is the first time nrservs is nonzero.
|
|
*/
|
|
int
|
|
nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
|
|
{
|
|
int error;
|
|
bool nfsd_up_before;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
dprintk("nfsd: creating service\n");
|
|
|
|
nrservs = max(nrservs, 0);
|
|
nrservs = min(nrservs, NFSD_MAXSERVS);
|
|
error = 0;
|
|
|
|
if (nrservs == 0 && nn->nfsd_serv == NULL)
|
|
goto out;
|
|
|
|
strscpy(nn->nfsd_name, utsname()->nodename,
|
|
sizeof(nn->nfsd_name));
|
|
|
|
error = nfsd_create_serv(net);
|
|
if (error)
|
|
goto out;
|
|
|
|
nfsd_up_before = nn->nfsd_net_up;
|
|
|
|
error = nfsd_startup_net(net, cred);
|
|
if (error)
|
|
goto out_put;
|
|
error = svc_set_num_threads(nn->nfsd_serv, NULL, nrservs);
|
|
if (error)
|
|
goto out_shutdown;
|
|
error = nn->nfsd_serv->sv_nrthreads;
|
|
out_shutdown:
|
|
if (error < 0 && !nfsd_up_before)
|
|
nfsd_shutdown_net(net);
|
|
out_put:
|
|
/* Threads now hold service active */
|
|
if (xchg(&nn->keep_active, 0))
|
|
nfsd_put(net);
|
|
nfsd_put(net);
|
|
out:
|
|
mutex_unlock(&nfsd_mutex);
|
|
return error;
|
|
}
|
|
|
|
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
|
|
static bool
|
|
nfsd_support_acl_version(int vers)
|
|
{
|
|
if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS)
|
|
return nfsd_acl_version[vers] != NULL;
|
|
return false;
|
|
}
|
|
|
|
static int
|
|
nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp,
|
|
u32 version, int family, unsigned short proto,
|
|
unsigned short port)
|
|
{
|
|
if (!nfsd_support_acl_version(version) ||
|
|
!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
|
|
return 0;
|
|
return svc_generic_rpcbind_set(net, progp, version, family,
|
|
proto, port);
|
|
}
|
|
|
|
static __be32
|
|
nfsd_acl_init_request(struct svc_rqst *rqstp,
|
|
const struct svc_program *progp,
|
|
struct svc_process_info *ret)
|
|
{
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
int i;
|
|
|
|
if (likely(nfsd_support_acl_version(rqstp->rq_vers) &&
|
|
nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
|
|
return svc_generic_init_request(rqstp, progp, ret);
|
|
|
|
ret->mismatch.lovers = NFSD_ACL_NRVERS;
|
|
for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {
|
|
if (nfsd_support_acl_version(rqstp->rq_vers) &&
|
|
nfsd_vers(nn, i, NFSD_TEST)) {
|
|
ret->mismatch.lovers = i;
|
|
break;
|
|
}
|
|
}
|
|
if (ret->mismatch.lovers == NFSD_ACL_NRVERS)
|
|
return rpc_prog_unavail;
|
|
ret->mismatch.hivers = NFSD_ACL_MINVERS;
|
|
for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) {
|
|
if (nfsd_support_acl_version(rqstp->rq_vers) &&
|
|
nfsd_vers(nn, i, NFSD_TEST)) {
|
|
ret->mismatch.hivers = i;
|
|
break;
|
|
}
|
|
}
|
|
return rpc_prog_mismatch;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
nfsd_rpcbind_set(struct net *net, const struct svc_program *progp,
|
|
u32 version, int family, unsigned short proto,
|
|
unsigned short port)
|
|
{
|
|
if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
|
|
return 0;
|
|
return svc_generic_rpcbind_set(net, progp, version, family,
|
|
proto, port);
|
|
}
|
|
|
|
static __be32
|
|
nfsd_init_request(struct svc_rqst *rqstp,
|
|
const struct svc_program *progp,
|
|
struct svc_process_info *ret)
|
|
{
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
int i;
|
|
|
|
if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
|
|
return svc_generic_init_request(rqstp, progp, ret);
|
|
|
|
ret->mismatch.lovers = NFSD_NRVERS;
|
|
for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
|
|
if (nfsd_vers(nn, i, NFSD_TEST)) {
|
|
ret->mismatch.lovers = i;
|
|
break;
|
|
}
|
|
}
|
|
if (ret->mismatch.lovers == NFSD_NRVERS)
|
|
return rpc_prog_unavail;
|
|
ret->mismatch.hivers = NFSD_MINVERS;
|
|
for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) {
|
|
if (nfsd_vers(nn, i, NFSD_TEST)) {
|
|
ret->mismatch.hivers = i;
|
|
break;
|
|
}
|
|
}
|
|
return rpc_prog_mismatch;
|
|
}
|
|
|
|
/*
|
|
* This is the NFS server kernel thread
|
|
*/
|
|
static int
|
|
nfsd(void *vrqstp)
|
|
{
|
|
struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
|
|
struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list);
|
|
struct net *net = perm_sock->xpt_net;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
int err;
|
|
|
|
/* At this point, the thread shares current->fs
|
|
* with the init process. We need to create files with the
|
|
* umask as defined by the client instead of init's umask. */
|
|
if (unshare_fs_struct() < 0) {
|
|
printk("Unable to start nfsd thread: out of memory\n");
|
|
goto out;
|
|
}
|
|
|
|
current->fs->umask = 0;
|
|
|
|
/*
|
|
* thread is spawned with all signals set to SIG_IGN, re-enable
|
|
* the ones that will bring down the thread
|
|
*/
|
|
allow_signal(SIGKILL);
|
|
allow_signal(SIGHUP);
|
|
allow_signal(SIGINT);
|
|
allow_signal(SIGQUIT);
|
|
|
|
atomic_inc(&nfsdstats.th_cnt);
|
|
|
|
set_freezable();
|
|
|
|
/*
|
|
* The main request loop
|
|
*/
|
|
for (;;) {
|
|
/* Update sv_maxconn if it has changed */
|
|
rqstp->rq_server->sv_maxconn = nn->max_connections;
|
|
|
|
/*
|
|
* Find a socket with data available and call its
|
|
* recvfrom routine.
|
|
*/
|
|
while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
|
|
;
|
|
if (err == -EINTR)
|
|
break;
|
|
validate_process_creds();
|
|
svc_process(rqstp);
|
|
validate_process_creds();
|
|
}
|
|
|
|
/* Clear signals before calling svc_exit_thread() */
|
|
flush_signals(current);
|
|
|
|
atomic_dec(&nfsdstats.th_cnt);
|
|
|
|
out:
|
|
/* Take an extra ref so that the svc_put in svc_exit_thread()
|
|
* doesn't call svc_destroy()
|
|
*/
|
|
svc_get(nn->nfsd_serv);
|
|
|
|
/* Release the thread */
|
|
svc_exit_thread(rqstp);
|
|
|
|
/* We need to drop a ref, but may not drop the last reference
|
|
* without holding nfsd_mutex, and we cannot wait for nfsd_mutex as that
|
|
* could deadlock with nfsd_shutdown_threads() waiting for us.
|
|
* So three options are:
|
|
* - drop a non-final reference,
|
|
* - get the mutex without waiting
|
|
* - sleep briefly andd try the above again
|
|
*/
|
|
while (!svc_put_not_last(nn->nfsd_serv)) {
|
|
if (mutex_trylock(&nfsd_mutex)) {
|
|
nfsd_put(net);
|
|
mutex_unlock(&nfsd_mutex);
|
|
break;
|
|
}
|
|
msleep(20);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nfsd_dispatch - Process an NFS or NFSACL Request
|
|
* @rqstp: incoming request
|
|
*
|
|
* This RPC dispatcher integrates the NFS server's duplicate reply cache.
|
|
*
|
|
* Return values:
|
|
* %0: Processing complete; do not send a Reply
|
|
* %1: Processing complete; send Reply in rqstp->rq_res
|
|
*/
|
|
int nfsd_dispatch(struct svc_rqst *rqstp)
|
|
{
|
|
const struct svc_procedure *proc = rqstp->rq_procinfo;
|
|
__be32 *statp = rqstp->rq_accept_statp;
|
|
|
|
/*
|
|
* Give the xdr decoder a chance to change this if it wants
|
|
* (necessary in the NFSv4.0 compound case)
|
|
*/
|
|
rqstp->rq_cachetype = proc->pc_cachetype;
|
|
|
|
if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
|
|
goto out_decode_err;
|
|
|
|
switch (nfsd_cache_lookup(rqstp)) {
|
|
case RC_DOIT:
|
|
break;
|
|
case RC_REPLY:
|
|
goto out_cached_reply;
|
|
case RC_DROPIT:
|
|
goto out_dropit;
|
|
}
|
|
|
|
*statp = proc->pc_func(rqstp);
|
|
if (test_bit(RQ_DROPME, &rqstp->rq_flags))
|
|
goto out_update_drop;
|
|
|
|
if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
|
|
goto out_encode_err;
|
|
|
|
nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
|
|
out_cached_reply:
|
|
return 1;
|
|
|
|
out_decode_err:
|
|
trace_nfsd_garbage_args_err(rqstp);
|
|
*statp = rpc_garbage_args;
|
|
return 1;
|
|
|
|
out_update_drop:
|
|
nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
|
|
out_dropit:
|
|
return 0;
|
|
|
|
out_encode_err:
|
|
trace_nfsd_cant_encode_err(rqstp);
|
|
nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
|
|
*statp = rpc_system_err;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* nfssvc_decode_voidarg - Decode void arguments
|
|
* @rqstp: Server RPC transaction context
|
|
* @xdr: XDR stream positioned at arguments to decode
|
|
*
|
|
* Return values:
|
|
* %false: Arguments were not valid
|
|
* %true: Decoding was successful
|
|
*/
|
|
bool nfssvc_decode_voidarg(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* nfssvc_encode_voidres - Encode void results
|
|
* @rqstp: Server RPC transaction context
|
|
* @xdr: XDR stream into which to encode results
|
|
*
|
|
* Return values:
|
|
* %false: Local error while encoding
|
|
* %true: Encoding was successful
|
|
*/
|
|
bool nfssvc_encode_voidres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int nfsd_pool_stats_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret;
|
|
struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
if (nn->nfsd_serv == NULL) {
|
|
mutex_unlock(&nfsd_mutex);
|
|
return -ENODEV;
|
|
}
|
|
svc_get(nn->nfsd_serv);
|
|
ret = svc_pool_stats_open(nn->nfsd_serv, file);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int nfsd_pool_stats_release(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = seq_release(inode, file);
|
|
struct net *net = inode->i_sb->s_fs_info;
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
nfsd_put(net);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return ret;
|
|
}
|