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c3e9c04b89
Stable bugfixes: - Revalidate "." and ".." correctly on open - Avoid RCU usage in tracepoints - Fix ugly referral attributes - Fix a typo in nomigration mount option - Revert "NFS: Move the flock open mode check into nfs_flock()" Features: - Implement a stronger send queue accounting system for NFS over RDMA - Switch some atomics to the new refcount_t type Other bugfixes and cleanups: - Clean up access mode bits - Remove special-case revalidations in nfs_opendir() - Improve invalidating NFS over RDMA memory for async operations that time out - Handle NFS over RDMA replies with a worqueue - Handle NFS over RDMA sends with a workqueue - Fix up replaying interrupted requests - Remove dead NFS over RDMA definitions - Update NFS over RDMA copyright information - Be more consistent with bool initialization and comparisons - Mark expected switch fall throughs - Various sunrpc tracepoint cleanups - Fix various OPEN races - Fix a typo in nfs_rename() - Use common error handling code in nfs_lock_and_join_request() - Check that some structures are properly cleaned up during net_exit() - Remove net pointer from dprintk()s -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEnZ5MQTpR7cLU7KEp18tUv7ClQOsFAloPWGwACgkQ18tUv7Cl QOtMVhAAufCkDxqO2lmDH+0JyYUKMcoOMYtI8s2J1HrbEzTW/dVtI28fPAKEEd4m 2JjNqnO516Jiv+g3E6eO4uunZRb4IB3AYT6YaTwmBFE+l7tpMdPb1xybOBP02Hji Y29kzLXwxxvnoxEqFalzCzV2BeRb2kAw6mayY9FxH6AfiEEQZfmxLCYgVuYa2jTC Z/B5E0GxAf28Aj0bIP8lLKbOkFijo851DB88UffEOZQGKUDlAd3GNUSSHb81Rj0N 4ef7bKoGylkIpZ1PdTChdG1+RKqud02zrmQfmEwXui3eUwhOWy8hrKloNykqR5sj pgoDz79euAq4TDVyQKtutnbvVxfCcBeMYAXZhXkZLVcl+39in0kuLj4SxU5AmDhf ErnthG4W7jsLMM96kMvSTaoh4uwioviG1KmZfvuvUoMBSwtiX18hFTWtFKRD6x9e PNOqBdh8nkKYEFbEO4ksfYaWZJ5AuyFIQiIpj1gm+7sf039oN/zEuPV+jaEJG0oa Ef9IqHrQbbCUFYFjpBENr3HjU3igTTaxQ5iq+VYl4zg1pw6m6JTojqZ6qtQzqOYS O3N1ygeShsW934z8QcWjtEyeUXIB3JF9vUS3gEBgWPDyCltGXyq4Cq6Lod4s4JCb pWGI6wJLX1Fg6nq7cj0S4Or3QBgz2q8ZyBxssamhdvON/Ef5ccI= =2Zc1 -----END PGP SIGNATURE----- Merge tag 'nfs-for-4.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs Pull NFS client updates from Anna Schumaker: "Stable bugfixes: - Revalidate "." and ".." correctly on open - Avoid RCU usage in tracepoints - Fix ugly referral attributes - Fix a typo in nomigration mount option - Revert "NFS: Move the flock open mode check into nfs_flock()" Features: - Implement a stronger send queue accounting system for NFS over RDMA - Switch some atomics to the new refcount_t type Other bugfixes and cleanups: - Clean up access mode bits - Remove special-case revalidations in nfs_opendir() - Improve invalidating NFS over RDMA memory for async operations that time out - Handle NFS over RDMA replies with a worqueue - Handle NFS over RDMA sends with a workqueue - Fix up replaying interrupted requests - Remove dead NFS over RDMA definitions - Update NFS over RDMA copyright information - Be more consistent with bool initialization and comparisons - Mark expected switch fall throughs - Various sunrpc tracepoint cleanups - Fix various OPEN races - Fix a typo in nfs_rename() - Use common error handling code in nfs_lock_and_join_request() - Check that some structures are properly cleaned up during net_exit() - Remove net pointer from dprintk()s" * tag 'nfs-for-4.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (62 commits) NFS: Revert "NFS: Move the flock open mode check into nfs_flock()" NFS: Fix typo in nomigration mount option nfs: Fix ugly referral attributes NFS: super: mark expected switch fall-throughs sunrpc: remove net pointer from messages nfs: remove net pointer from messages sunrpc: exit_net cleanup check added nfs client: exit_net cleanup check added nfs/write: Use common error handling code in nfs_lock_and_join_requests() NFSv4: Replace closed stateids with the "invalid special stateid" NFSv4: nfs_set_open_stateid must not trigger state recovery for closed state NFSv4: Check the open stateid when searching for expired state NFSv4: Clean up nfs4_delegreturn_done NFSv4: cleanup nfs4_close_done NFSv4: Retry NFS4ERR_OLD_STATEID errors in layoutreturn pNFS: Retry NFS4ERR_OLD_STATEID errors in layoutreturn-on-close NFSv4: Don't try to CLOSE if the stateid 'other' field has changed NFSv4: Retry CLOSE and DELEGRETURN on NFS4ERR_OLD_STATEID. NFS: Fix a typo in nfs_rename() NFSv4: Fix open create exclusive when the server reboots ...
159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/nfs/cache_lib.c
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*
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* Helper routines for the NFS client caches
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*
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* Copyright (c) 2009 Trond Myklebust <Trond.Myklebust@netapp.com>
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*/
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#include <linux/kmod.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/cache.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <net/net_namespace.h>
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#include "cache_lib.h"
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#define NFS_CACHE_UPCALL_PATHLEN 256
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#define NFS_CACHE_UPCALL_TIMEOUT 15
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static char nfs_cache_getent_prog[NFS_CACHE_UPCALL_PATHLEN] =
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"/sbin/nfs_cache_getent";
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static unsigned long nfs_cache_getent_timeout = NFS_CACHE_UPCALL_TIMEOUT;
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module_param_string(cache_getent, nfs_cache_getent_prog,
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sizeof(nfs_cache_getent_prog), 0600);
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MODULE_PARM_DESC(cache_getent, "Path to the client cache upcall program");
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module_param_named(cache_getent_timeout, nfs_cache_getent_timeout, ulong, 0600);
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MODULE_PARM_DESC(cache_getent_timeout, "Timeout (in seconds) after which "
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"the cache upcall is assumed to have failed");
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int nfs_cache_upcall(struct cache_detail *cd, char *entry_name)
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{
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static char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL
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};
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char *argv[] = {
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nfs_cache_getent_prog,
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cd->name,
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entry_name,
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NULL
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};
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int ret = -EACCES;
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if (nfs_cache_getent_prog[0] == '\0')
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goto out;
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ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
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/*
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* Disable the upcall mechanism if we're getting an ENOENT or
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* EACCES error. The admin can re-enable it on the fly by using
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* sysfs to set the 'cache_getent' parameter once the problem
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* has been fixed.
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*/
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if (ret == -ENOENT || ret == -EACCES)
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nfs_cache_getent_prog[0] = '\0';
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out:
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return ret > 0 ? 0 : ret;
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}
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/*
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* Deferred request handling
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*/
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void nfs_cache_defer_req_put(struct nfs_cache_defer_req *dreq)
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{
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if (refcount_dec_and_test(&dreq->count))
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kfree(dreq);
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}
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static void nfs_dns_cache_revisit(struct cache_deferred_req *d, int toomany)
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{
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struct nfs_cache_defer_req *dreq;
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dreq = container_of(d, struct nfs_cache_defer_req, deferred_req);
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complete(&dreq->completion);
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nfs_cache_defer_req_put(dreq);
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}
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static struct cache_deferred_req *nfs_dns_cache_defer(struct cache_req *req)
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{
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struct nfs_cache_defer_req *dreq;
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dreq = container_of(req, struct nfs_cache_defer_req, req);
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dreq->deferred_req.revisit = nfs_dns_cache_revisit;
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refcount_inc(&dreq->count);
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return &dreq->deferred_req;
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}
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struct nfs_cache_defer_req *nfs_cache_defer_req_alloc(void)
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{
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struct nfs_cache_defer_req *dreq;
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dreq = kzalloc(sizeof(*dreq), GFP_KERNEL);
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if (dreq) {
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init_completion(&dreq->completion);
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refcount_set(&dreq->count, 1);
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dreq->req.defer = nfs_dns_cache_defer;
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}
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return dreq;
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}
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int nfs_cache_wait_for_upcall(struct nfs_cache_defer_req *dreq)
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{
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if (wait_for_completion_timeout(&dreq->completion,
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nfs_cache_getent_timeout * HZ) == 0)
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return -ETIMEDOUT;
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return 0;
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}
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int nfs_cache_register_sb(struct super_block *sb, struct cache_detail *cd)
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{
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int ret;
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struct dentry *dir;
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dir = rpc_d_lookup_sb(sb, "cache");
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ret = sunrpc_cache_register_pipefs(dir, cd->name, 0600, cd);
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dput(dir);
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return ret;
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}
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int nfs_cache_register_net(struct net *net, struct cache_detail *cd)
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{
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struct super_block *pipefs_sb;
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int ret = 0;
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sunrpc_init_cache_detail(cd);
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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ret = nfs_cache_register_sb(pipefs_sb, cd);
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rpc_put_sb_net(net);
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if (ret)
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sunrpc_destroy_cache_detail(cd);
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}
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return ret;
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}
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void nfs_cache_unregister_sb(struct super_block *sb, struct cache_detail *cd)
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{
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sunrpc_cache_unregister_pipefs(cd);
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}
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void nfs_cache_unregister_net(struct net *net, struct cache_detail *cd)
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{
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struct super_block *pipefs_sb;
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pipefs_sb = rpc_get_sb_net(net);
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if (pipefs_sb) {
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nfs_cache_unregister_sb(pipefs_sb, cd);
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rpc_put_sb_net(net);
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}
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sunrpc_destroy_cache_detail(cd);
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}
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