hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Trond Myklebust 2009-08-09 15:14:27 -04:00
parent 2da8ca26c6
commit 5b7a1b9f92
1 changed files with 20 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
net/sunrpc/cache.c
View File

@ -347,13 +347,8 @@ static int create_cache_proc_entries(struct cache_detail *cd)
} }
#endif #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); rwlock_init(&cd->hash_lock);
INIT_LIST_HEAD(&cd->queue); INIT_LIST_HEAD(&cd->queue);
spin_lock(&cache_list_lock); spin_lock(&cache_list_lock);
@ -367,11 +362,9 @@ int cache_register(struct cache_detail *cd)
/* start the cleaning process */ /* start the cleaning process */
schedule_delayed_work(&cache_cleaner, 0); 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); cache_purge(cd);
spin_lock(&cache_list_lock); spin_lock(&cache_list_lock);
@ -386,7 +379,6 @@ void cache_unregister(struct cache_detail *cd)
list_del_init(&cd->others); list_del_init(&cd->others);
write_unlock(&cd->hash_lock); write_unlock(&cd->hash_lock);
spin_unlock(&cache_list_lock); spin_unlock(&cache_list_lock);
remove_cache_proc_entries(cd);
if (list_empty(&cache_list)) { if (list_empty(&cache_list)) {
/* module must be being unloaded so its safe to kill the worker */ /* module must be being unloaded so its safe to kill the worker */
cancel_delayed_work_sync(&cache_cleaner); cancel_delayed_work_sync(&cache_cleaner);
@ -395,6 +387,24 @@ void cache_unregister(struct cache_detail *cd)
out: out:
printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name); 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); EXPORT_SYMBOL_GPL(cache_unregister);
/* clean cache tries to find something to clean /* clean cache tries to find something to clean