diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfs/cache_lib.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfs/cache_lib.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/ANDROID_3.4.5/fs/nfs/cache_lib.c b/ANDROID_3.4.5/fs/nfs/cache_lib.c deleted file mode 100644 index dded2636..00000000 --- a/ANDROID_3.4.5/fs/nfs/cache_lib.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * linux/fs/nfs/cache_lib.c - * - * Helper routines for the NFS client caches - * - * Copyright (c) 2009 Trond Myklebust <Trond.Myklebust@netapp.com> - */ -#include <linux/kmod.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/mount.h> -#include <linux/namei.h> -#include <linux/slab.h> -#include <linux/sunrpc/cache.h> -#include <linux/sunrpc/rpc_pipe_fs.h> -#include <net/net_namespace.h> - -#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_all(&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"); - BUG_ON(dir == NULL); - 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; - - pipefs_sb = rpc_get_sb_net(net); - if (pipefs_sb) { - ret = nfs_cache_register_sb(pipefs_sb, cd); - rpc_put_sb_net(net); - } - 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); - } -} - -void nfs_cache_init(struct cache_detail *cd) -{ - sunrpc_init_cache_detail(cd); -} - -void nfs_cache_destroy(struct cache_detail *cd) -{ - sunrpc_destroy_cache_detail(cd); -} |