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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-09 23:14:27 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-09 23:14:27 +0400 |
| commit | 5b7a1b9f9214cb89dd164b43ca3fab7af4058e06 (patch) | |
| tree | f39343aeedb1973eddac30ef84ec1bbf73f1fe14 /net/sunrpc/cache.c | |
| parent | 2da8ca26c6bfad685bfddf39728eac1c83906aa9 (diff) | |
| download | linux-5b7a1b9f9214cb89dd164b43ca3fab7af4058e06.tar.xz | |
SUNRPC: Ensure we initialise the cache_detail before creating procfs files
Also ensure that we destroy those files before we destroy the cache_detail.
Otherwise, user processes might attempt to write into uninitialised caches.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/cache.c')
| -rw-r--r-- | net/sunrpc/cache.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 8ede4a6f384b..062d4f4307eb 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -347,13 +347,8 @@ static int create_cache_proc_entries(struct cache_detail *cd) } #endif -int cache_register(struct cache_detail *cd) +static void sunrpc_init_cache_detail(struct cache_detail *cd) { - int ret; - - ret = create_cache_proc_entries(cd); - if (ret) - return ret; rwlock_init(&cd->hash_lock); INIT_LIST_HEAD(&cd->queue); spin_lock(&cache_list_lock); @@ -367,11 +362,9 @@ int cache_register(struct cache_detail *cd) /* start the cleaning process */ schedule_delayed_work(&cache_cleaner, 0); - return 0; } -EXPORT_SYMBOL_GPL(cache_register); -void cache_unregister(struct cache_detail *cd) +static void sunrpc_destroy_cache_detail(struct cache_detail *cd) { cache_purge(cd); spin_lock(&cache_list_lock); @@ -386,7 +379,6 @@ void cache_unregister(struct cache_detail *cd) list_del_init(&cd->others); write_unlock(&cd->hash_lock); spin_unlock(&cache_list_lock); - remove_cache_proc_entries(cd); if (list_empty(&cache_list)) { /* module must be being unloaded so its safe to kill the worker */ cancel_delayed_work_sync(&cache_cleaner); @@ -395,6 +387,24 @@ void cache_unregister(struct cache_detail *cd) out: printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name); } + +int cache_register(struct cache_detail *cd) +{ + int ret; + + sunrpc_init_cache_detail(cd); + ret = create_cache_proc_entries(cd); + if (ret) + sunrpc_destroy_cache_detail(cd); + return ret; +} +EXPORT_SYMBOL_GPL(cache_register); + +void cache_unregister(struct cache_detail *cd) +{ + remove_cache_proc_entries(cd); + sunrpc_destroy_cache_detail(cd); +} EXPORT_SYMBOL_GPL(cache_unregister); /* clean cache tries to find something to clean |