/* * linux/fs/nfs/cache_lib.c * * Helper routines for the NFS client caches * * Copyright (c) 2009 Trond Myklebust */ #include #include #include #include #include #include #include #include #include #include "cache_lib.h" #define NFS_CACHE_UPCALL_PATHLEN 256 #define NFS_CACHE_UPCALL_TIMEOUT 15 static char nfs_cache_getent_prog[NFS_CACHE_UPCALL_PATHLEN] = "/sbin/nfs_cache_getent"; static unsigned long nfs_cache_getent_timeout = NFS_CACHE_UPCALL_TIMEOUT; module_param_string(cache_getent, nfs_cache_getent_prog, sizeof(nfs_cache_getent_prog), 0600); MODULE_PARM_DESC(cache_getent, "Path to the client cache upcall program"); module_param_named(cache_getent_timeout, nfs_cache_getent_timeout, ulong, 0600); MODULE_PARM_DESC(cache_getent_timeout, "Timeout (in seconds) after which " "the cache upcall is assumed to have failed"); int nfs_cache_upcall(struct cache_detail *cd, char *entry_name) { static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; char *argv[] = { nfs_cache_getent_prog, cd->name, entry_name, NULL }; int ret = -EACCES; if (nfs_cache_getent_prog[0] == '\0') goto out; ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); /* * Disable the upcall mechanism if we're getting an ENOENT or * EACCES error. The admin can re-enable it on the fly by using * sysfs to set the 'cache_getent' parameter once the problem * has been fixed. */ if (ret == -ENOENT || ret == -EACCES) nfs_cache_getent_prog[0] = '\0'; out: return ret > 0 ? 0 : ret; } /* * Deferred request handling */ void nfs_cache_defer_req_put(struct nfs_cache_defer_req *dreq) { if (atomic_dec_and_test(&dreq->count)) kfree(dreq); } static void nfs_dns_cache_revisit(struct cache_deferred_req *d, int toomany) { struct nfs_cache_defer_req *dreq; dreq = container_of(d, struct nfs_cache_defer_req, deferred_req); complete(&dreq->completion); nfs_cache_defer_req_put(dreq); } static struct cache_deferred_req *nfs_dns_cache_defer(struct cache_req *req) { struct nfs_cache_defer_req *dreq; dreq = container_of(req, struct nfs_cache_defer_req, req); dreq->deferred_req.revisit = nfs_dns_cache_revisit; atomic_inc(&dreq->count); return &dreq->deferred_req; } struct nfs_cache_defer_req *nfs_cache_defer_req_alloc(void) { struct nfs_cache_defer_req *dreq; dreq = kzalloc(sizeof(*dreq), GFP_KERNEL); if (dreq) { init_completion(&dreq->completion); atomic_set(&dreq->count, 1); dreq->req.defer = nfs_dns_cache_defer; } return dreq; } int nfs_cache_wait_for_upcall(struct nfs_cache_defer_req *dreq) { if (wait_for_completion_timeout(&dreq->completion, nfs_cache_getent_timeout * HZ) == 0) return -ETIMEDOUT; return 0; } int nfs_cache_register_sb(struct super_block *sb, struct cache_detail *cd) { int ret; struct dentry *dir; dir = rpc_d_lookup_sb(sb, "cache"); ret = sunrpc_cache_register_pipefs(dir, cd->name, 0600, cd); dput(dir); return ret; } int nfs_cache_register_net(struct net *net, struct cache_detail *cd) { struct super_block *pipefs_sb; int ret = 0; sunrpc_init_cache_detail(cd); pipefs_sb = rpc_get_sb_net(net); if (pipefs_sb) { ret = nfs_cache_register_sb(pipefs_sb, cd); rpc_put_sb_net(net); if (ret) sunrpc_destroy_cache_detail(cd); } return ret; } void nfs_cache_unregister_sb(struct super_block *sb, struct cache_detail *cd) { if (cd->u.pipefs.dir) sunrpc_cache_unregister_pipefs(cd); } void nfs_cache_unregister_net(struct net *net, struct cache_detail *cd) { struct super_block *pipefs_sb; pipefs_sb = rpc_get_sb_net(net); if (pipefs_sb) { nfs_cache_unregister_sb(pipefs_sb, cd); rpc_put_sb_net(net); } sunrpc_destroy_cache_detail(cd); } 31739ec327ff4'>logplain -rwxr-xr-xPERF-VERSION-GEN1010log plain -rw-r--r--alias.c1471log plain -rw-r--r--annotate.c44411log plain -rw-r--r--annotate.h5583log plain -rw-r--r--auxtrace.c47774log plain -rw-r--r--auxtrace.h22142log plain -rw-r--r--block-range.c6948log plain -rw-r--r--block-range.h1607log plain -rw-r--r--bpf-loader.c40787log plain -rw-r--r--bpf-loader.h6215log plain -rw-r--r--bpf-prologue.c11226log plain -rw-r--r--bpf-prologue.h847log plain -rw-r--r--build-id.c19054log plain -rw-r--r--build-id.h1859log plain d---------c++184log plain -rw-r--r--cache.h733log plain -rw-r--r--call-path.c2893log plain -rw-r--r--call-path.h2203log plain -rw-r--r--callchain.c29332log plain -rw-r--r--callchain.h7881log plain -rw-r--r--cgroup.c3195log plain -rw-r--r--cgroup.h359log plain -rw-r--r--cloexec.c1950log plain -rw-r--r--cloexec.h251log plain -rw-r--r--color.c4787log plain -rw-r--r--color.h1647log plain -rw-r--r--comm.c2239log plain -rw-r--r--comm.h561log plain -rw-r--r--config.c16262log plain -rw-r--r--config.h2113log plain -rw-r--r--counts.c1026log plain -rw-r--r--counts.h790log plain -rw-r--r--cpumap.c12627log plain -rw-r--r--cpumap.h1954log plain -rw-r--r--cs-etm.h2061log plain -rw-r--r--ctype.c2018log plain -rw-r--r--data-convert-bt.c36671log plain -rw-r--r--data-convert-bt.h302log plain -rw-r--r--data-convert.h141log plain -rw-r--r--data.c3459log plain -rw-r--r--data.h1369log plain -rw-r--r--db-export.c11434log plain -rw-r--r--db-export.h3816log plain -rw-r--r--debug.c4417log plain -rw-r--r--debug.h2023log plain -rw-r--r--demangle-java.c4219log plain -rw-r--r--demangle-java.h249log plain -rw-r--r--demangle-rust.c6602log plain -rw-r--r--demangle-rust.h170log plain -rw-r--r--drv_configs.c1834log plain -rw-r--r--drv_configs.h844log plain -rw-r--r--dso.c31994log plain -rw-r--r--dso.h10399log plain -rw-r--r--dwarf-aux.c33828log plain -rw-r--r--dwarf-aux.h5101log plain -rw-r--r--dwarf-regs.c1816log plain -rw-r--r--env.c1884log plain -rw-r--r--env.h1268log plain -rw-r--r--event.c36670log plain -rw-r--r--event.h15997log plain -rw-r--r--evlist.c47104log plain -rw-r--r--evlist.h12584log plain -rw-r--r--evsel.c63917log plain -rw-r--r--evsel.h13041log plain -rw-r--r--evsel_fprintf.c5831log plain -rw-r--r--find-vdso-map.c581log plain -rw-r--r--genelf.c11653log plain -rw-r--r--genelf.h1814log plain -rw-r--r--genelf_debug.c14374log plain -rwxr-xr-xgenerate-cmdlist.sh1141log plain -rw-r--r--group.h122log plain -rw-r--r--header.c73410log plain -rw-r--r--header.h4365log plain -rw-r--r--help-unknown-cmd.c3221log plain