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![Vasily Averin](/assets/img/avatar_default.png)
nfsd_inet[6]addr_event uses nn->nfsd_serv without taking nfsd_mutex, which can be changed during execution of notifiers and crash the host. Moreover if notifiers were enabled in one net namespace they are enabled in all other net namespaces, from creation until destruction. This patch allows notifiers to access nn->nfsd_serv only after the pointer is correctly initialized and delays cleanup until notifiers are no longer in use. Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Tested-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
893 lines
22 KiB
C
893 lines
22 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/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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#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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/*
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* nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
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* of the svc_serv struct. In particular, ->sv_nrthreads but also to some
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* extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
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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. That number
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* of nfsd threads must exist and each must listed in ->sp_all_threads in each
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* entry of ->sv_pools[].
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*
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* Transitions of the thread count between zero and non-zero are of particular
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* interest since the svc_serv needs to be created and initialized at that
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* point, or freed.
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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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spinlock_t 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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[2] = &nfsd_acl_version2,
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[3] = &nfsd_acl_version3,
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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 const struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
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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_versions,
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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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};
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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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[2] = &nfsd_version2,
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#if defined(CONFIG_NFSD_V3)
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[3] = &nfsd_version3,
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#endif
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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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static const struct svc_version *nfsd_versions[NFSD_NRVERS];
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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_versions, /* 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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};
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static bool nfsd_supported_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1] = {
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[0] = 1,
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[1] = 1,
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[2] = 1,
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};
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int nfsd_vers(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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nfsd_versions[vers] = nfsd_version[vers];
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#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
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if (vers < NFSD_ACL_NRVERS)
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nfsd_acl_versions[vers] = nfsd_acl_version[vers];
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#endif
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break;
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case NFSD_CLEAR:
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nfsd_versions[vers] = NULL;
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#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
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if (vers < NFSD_ACL_NRVERS)
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nfsd_acl_versions[vers] = NULL;
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#endif
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break;
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case NFSD_TEST:
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return nfsd_versions[vers] != NULL;
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case NFSD_AVAIL:
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return nfsd_version[vers] != NULL;
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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(void)
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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 (nfsd_supported_minorversions[i])
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return;
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}
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nfsd_vers(4, NFSD_CLEAR);
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}
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int nfsd_minorversion(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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nfsd_supported_minorversions[minorversion] = true;
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nfsd_vers(4, NFSD_SET);
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break;
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case NFSD_CLEAR:
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nfsd_supported_minorversions[minorversion] = false;
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nfsd_adjust_nfsd_versions4();
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break;
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case NFSD_TEST:
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return nfsd_supported_minorversions[minorversion];
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case NFSD_AVAIL:
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return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
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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)
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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_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT,
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SVC_SOCK_DEFAULTS);
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if (error < 0)
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return error;
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error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT,
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SVC_SOCK_DEFAULTS);
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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(int nrservs)
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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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/*
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* Readahead param cache - will no-op if it already exists.
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* (Note therefore results will be suboptimal if number of
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* threads is modified after nfsd start.)
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*/
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ret = nfsd_racache_init(2*nrservs);
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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_racache;
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return 0;
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out_racache:
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nfsd_racache_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_racache_shutdown();
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}
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static bool nfsd_needs_lockd(void)
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{
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#if defined(CONFIG_NFSD_V3)
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return (nfsd_versions[2] != NULL) || (nfsd_versions[3] != NULL);
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#else
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return (nfsd_versions[2] != NULL);
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#endif
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}
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static int nfsd_startup_net(int nrservs, struct net *net)
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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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if (nn->nfsd_net_up)
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return 0;
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ret = nfsd_startup_generic(nrservs);
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if (ret)
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return ret;
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ret = nfsd_init_socks(net);
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if (ret)
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goto out_socks;
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if (nfsd_needs_lockd() && !nn->lockd_up) {
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ret = lockd_up(net);
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if (ret)
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goto out_socks;
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nn->lockd_up = 1;
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}
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ret = nfs4_state_start_net(net);
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if (ret)
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goto out_lockd;
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nn->nfsd_net_up = true;
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return 0;
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out_lockd:
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if (nn->lockd_up) {
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lockd_down(net);
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nn->lockd_up = 0;
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}
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out_socks:
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nfsd_shutdown_generic();
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return ret;
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}
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static void nfsd_shutdown_net(struct net *net)
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{
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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nfs4_state_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 = 0;
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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 int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event,
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void *ptr)
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{
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struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
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struct net_device *dev = ifa->ifa_dev->dev;
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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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if ((event != NETDEV_DOWN) ||
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!atomic_inc_not_zero(&nn->ntf_refcnt))
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goto out;
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if (nn->nfsd_serv) {
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dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ifa->ifa_local;
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svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin);
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}
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atomic_dec(&nn->ntf_refcnt);
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wake_up(&nn->ntf_wq);
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out:
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return NOTIFY_DONE;
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}
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static struct notifier_block nfsd_inetaddr_notifier = {
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.notifier_call = nfsd_inetaddr_event,
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};
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#if IS_ENABLED(CONFIG_IPV6)
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static int nfsd_inet6addr_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
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struct net_device *dev = ifa->idev->dev;
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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_in6 sin6;
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if ((event != NETDEV_DOWN) ||
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!atomic_inc_not_zero(&nn->ntf_refcnt))
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goto out;
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if (nn->nfsd_serv) {
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dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr);
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sin6.sin6_family = AF_INET6;
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sin6.sin6_addr = ifa->addr;
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if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin6.sin6_scope_id = ifa->idev->dev->ifindex;
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svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6);
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}
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atomic_dec(&nn->ntf_refcnt);
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wake_up(&nn->ntf_wq);
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out:
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return NOTIFY_DONE;
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}
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static struct notifier_block nfsd_inet6addr_notifier = {
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.notifier_call = nfsd_inet6addr_event,
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};
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#endif
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/* Only used under nfsd_mutex, so this atomic may be overkill: */
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static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0);
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static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
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{
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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atomic_dec(&nn->ntf_refcnt);
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/* check if the notifier still has clients */
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if (atomic_dec_return(&nfsd_notifier_refcount) == 0) {
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unregister_inetaddr_notifier(&nfsd_inetaddr_notifier);
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#if IS_ENABLED(CONFIG_IPV6)
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unregister_inet6addr_notifier(&nfsd_inet6addr_notifier);
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#endif
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}
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wait_event(nn->ntf_wq, atomic_read(&nn->ntf_refcnt) == 0);
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/*
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* write_ports can create the server without actually starting
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* any threads--if we get shut down before any threads are
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* started, then nfsd_last_thread will be run before any of this
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* other initialization has been done except the rpcb information.
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*/
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svc_rpcb_cleanup(serv, net);
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if (!nn->nfsd_net_up)
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return;
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nfsd_shutdown_net(net);
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printk(KERN_WARNING "nfsd: last server has exited, flushing export "
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"cache\n");
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nfsd_export_flush(net);
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}
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void nfsd_reset_versions(void)
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{
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int i;
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for (i = 0; i < NFSD_NRVERS; i++)
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if (nfsd_vers(i, NFSD_TEST))
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return;
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for (i = 0; i < NFSD_NRVERS; i++)
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if (i != 4)
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nfsd_vers(i, NFSD_SET);
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else {
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int minor = 0;
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while (nfsd_minorversion(minor, NFSD_SET) >= 0)
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minor++;
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}
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}
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/*
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* Each session guarantees a negotiated per slot memory cache for replies
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* which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
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* NFSv4.1 server might want to use more memory for a DRC than a machine
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* with mutiple services.
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*
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* Impose a hard limit on the number of pages for the DRC which varies
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* according to the machines free pages. This is of course only a default.
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*
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* For now this is a #defined shift which could be under admin control
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* in the future.
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*/
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static void set_max_drc(void)
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{
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#define NFSD_DRC_SIZE_SHIFT 7
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nfsd_drc_max_mem = (nr_free_buffer_pages()
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>> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
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nfsd_drc_mem_used = 0;
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spin_lock_init(&nfsd_drc_lock);
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dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
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}
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static int nfsd_get_default_max_blksize(void)
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{
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struct sysinfo i;
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unsigned long long target;
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unsigned long ret;
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si_meminfo(&i);
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target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
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/*
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* Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
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* machines, but only uses 32K on 128M machines. Bottom out at
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* 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;
|
|
}
|
|
|
|
static const struct svc_serv_ops nfsd_thread_sv_ops = {
|
|
.svo_shutdown = nfsd_last_thread,
|
|
.svo_function = nfsd,
|
|
.svo_enqueue_xprt = svc_xprt_do_enqueue,
|
|
.svo_setup = svc_set_num_threads,
|
|
.svo_module = THIS_MODULE,
|
|
};
|
|
|
|
int nfsd_create_serv(struct net *net)
|
|
{
|
|
int error;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
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->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
|
|
&nfsd_thread_sv_ops);
|
|
if (nn->nfsd_serv == NULL)
|
|
return -ENOMEM;
|
|
|
|
nn->nfsd_serv->sv_maxconn = nn->max_connections;
|
|
error = svc_bind(nn->nfsd_serv, net);
|
|
if (error < 0) {
|
|
svc_destroy(nn->nfsd_serv);
|
|
return error;
|
|
}
|
|
|
|
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
|
|
}
|
|
atomic_inc(&nn->ntf_refcnt);
|
|
ktime_get_real_ts64(&nn->nfssvc_boot); /* record boot time */
|
|
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;
|
|
}
|
|
|
|
void nfsd_destroy(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
int destroy = (nn->nfsd_serv->sv_nrthreads == 1);
|
|
|
|
if (destroy)
|
|
svc_shutdown_net(nn->nfsd_serv, net);
|
|
svc_destroy(nn->nfsd_serv);
|
|
if (destroy)
|
|
nn->nfsd_serv = NULL;
|
|
}
|
|
|
|
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 = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
|
|
&nn->nfsd_serv->sv_pools[i], nthreads[i]);
|
|
if (err)
|
|
break;
|
|
}
|
|
nfsd_destroy(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)
|
|
{
|
|
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;
|
|
|
|
error = nfsd_create_serv(net);
|
|
if (error)
|
|
goto out;
|
|
|
|
nfsd_up_before = nn->nfsd_net_up;
|
|
|
|
error = nfsd_startup_net(nrservs, net);
|
|
if (error)
|
|
goto out_destroy;
|
|
error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
|
|
NULL, nrservs);
|
|
if (error)
|
|
goto out_shutdown;
|
|
/* We are holding a reference to nn->nfsd_serv which
|
|
* we don't want to count in the return value,
|
|
* so subtract 1
|
|
*/
|
|
error = nn->nfsd_serv->sv_nrthreads - 1;
|
|
out_shutdown:
|
|
if (error < 0 && !nfsd_up_before)
|
|
nfsd_shutdown_net(net);
|
|
out_destroy:
|
|
nfsd_destroy(net); /* Release server */
|
|
out:
|
|
mutex_unlock(&nfsd_mutex);
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/* Lock module and set up kernel thread */
|
|
mutex_lock(&nfsd_mutex);
|
|
|
|
/* 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);
|
|
|
|
nfsdstats.th_cnt++;
|
|
mutex_unlock(&nfsd_mutex);
|
|
|
|
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);
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
nfsdstats.th_cnt --;
|
|
|
|
out:
|
|
rqstp->rq_server = NULL;
|
|
|
|
/* Release the thread */
|
|
svc_exit_thread(rqstp);
|
|
|
|
nfsd_destroy(net);
|
|
|
|
/* Release module */
|
|
mutex_unlock(&nfsd_mutex);
|
|
module_put_and_exit(0);
|
|
return 0;
|
|
}
|
|
|
|
static __be32 map_new_errors(u32 vers, __be32 nfserr)
|
|
{
|
|
if (nfserr == nfserr_jukebox && vers == 2)
|
|
return nfserr_dropit;
|
|
if (nfserr == nfserr_wrongsec && vers < 4)
|
|
return nfserr_acces;
|
|
return nfserr;
|
|
}
|
|
|
|
/*
|
|
* A write procedure can have a large argument, and a read procedure can
|
|
* have a large reply, but no NFSv2 or NFSv3 procedure has argument and
|
|
* reply that can both be larger than a page. The xdr code has taken
|
|
* advantage of this assumption to be a sloppy about bounds checking in
|
|
* some cases. Pending a rewrite of the NFSv2/v3 xdr code to fix that
|
|
* problem, we enforce these assumptions here:
|
|
*/
|
|
static bool nfs_request_too_big(struct svc_rqst *rqstp,
|
|
const struct svc_procedure *proc)
|
|
{
|
|
/*
|
|
* The ACL code has more careful bounds-checking and is not
|
|
* susceptible to this problem:
|
|
*/
|
|
if (rqstp->rq_prog != NFS_PROGRAM)
|
|
return false;
|
|
/*
|
|
* Ditto NFSv4 (which can in theory have argument and reply both
|
|
* more than a page):
|
|
*/
|
|
if (rqstp->rq_vers >= 4)
|
|
return false;
|
|
/* The reply will be small, we're OK: */
|
|
if (proc->pc_xdrressize > 0 &&
|
|
proc->pc_xdrressize < XDR_QUADLEN(PAGE_SIZE))
|
|
return false;
|
|
|
|
return rqstp->rq_arg.len > PAGE_SIZE;
|
|
}
|
|
|
|
int
|
|
nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
|
|
{
|
|
const struct svc_procedure *proc;
|
|
__be32 nfserr;
|
|
__be32 *nfserrp;
|
|
|
|
dprintk("nfsd_dispatch: vers %d proc %d\n",
|
|
rqstp->rq_vers, rqstp->rq_proc);
|
|
proc = rqstp->rq_procinfo;
|
|
|
|
if (nfs_request_too_big(rqstp, proc)) {
|
|
dprintk("nfsd: NFSv%d argument too large\n", rqstp->rq_vers);
|
|
*statp = rpc_garbage_args;
|
|
return 1;
|
|
}
|
|
/*
|
|
* 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;
|
|
/* Decode arguments */
|
|
if (proc->pc_decode &&
|
|
!proc->pc_decode(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base)) {
|
|
dprintk("nfsd: failed to decode arguments!\n");
|
|
*statp = rpc_garbage_args;
|
|
return 1;
|
|
}
|
|
|
|
/* Check whether we have this call in the cache. */
|
|
switch (nfsd_cache_lookup(rqstp)) {
|
|
case RC_DROPIT:
|
|
return 0;
|
|
case RC_REPLY:
|
|
return 1;
|
|
case RC_DOIT:;
|
|
/* do it */
|
|
}
|
|
|
|
/* need to grab the location to store the status, as
|
|
* nfsv4 does some encoding while processing
|
|
*/
|
|
nfserrp = rqstp->rq_res.head[0].iov_base
|
|
+ rqstp->rq_res.head[0].iov_len;
|
|
rqstp->rq_res.head[0].iov_len += sizeof(__be32);
|
|
|
|
/* Now call the procedure handler, and encode NFS status. */
|
|
nfserr = proc->pc_func(rqstp);
|
|
nfserr = map_new_errors(rqstp->rq_vers, nfserr);
|
|
if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) {
|
|
dprintk("nfsd: Dropping request; may be revisited later\n");
|
|
nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
|
|
return 0;
|
|
}
|
|
|
|
if (rqstp->rq_proc != 0)
|
|
*nfserrp++ = nfserr;
|
|
|
|
/* Encode result.
|
|
* For NFSv2, additional info is never returned in case of an error.
|
|
*/
|
|
if (!(nfserr && rqstp->rq_vers == 2)) {
|
|
if (proc->pc_encode && !proc->pc_encode(rqstp, nfserrp)) {
|
|
/* Failed to encode result. Release cache entry */
|
|
dprintk("nfsd: failed to encode result!\n");
|
|
nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
|
|
*statp = rpc_system_err;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Store reply in cache. */
|
|
nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
|
|
return 1;
|
|
}
|
|
|
|
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;
|
|
}
|
|
/* bump up the psudo refcount while traversing */
|
|
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);
|
|
/* this function really, really should have been called svc_put() */
|
|
nfsd_destroy(net);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return ret;
|
|
}
|