path: root/fs/notify/notification.c
diff options
authorEric Paris <eparis@redhat.com>2009-07-15 15:49:52 -0400
committerEric Paris <eparis@redhat.com>2009-07-21 15:26:27 -0400
commitf44aebcc566d1d6275f7191867b9633dc11de2ee (patch)
treea5faaf5ca8e1360f359ee22ad29582992596c3e6 /fs/notify/notification.c
parentc05594b62125c528d93af3a78229793aae36df7f (diff)
inotify: use GFP_NOFS under potential memory pressure
inotify can have a watchs removed under filesystem reclaim. ================================= [ INFO: inconsistent lock state ] 2.6.31-rc2 #16 --------------------------------- inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage. khubd/217 [HC0[0]:SC0[0]:HE1:SE1] takes: (iprune_mutex){+.+.?.}, at: [<c10ba899>] invalidate_inodes+0x20/0xe3 {IN-RECLAIM_FS-W} state was registered at: [<c10536ab>] __lock_acquire+0x2c9/0xac4 [<c1053f45>] lock_acquire+0x9f/0xc2 [<c1308872>] __mutex_lock_common+0x2d/0x323 [<c1308c00>] mutex_lock_nested+0x2e/0x36 [<c10ba6ff>] shrink_icache_memory+0x38/0x1b2 [<c108bfb6>] shrink_slab+0xe2/0x13c [<c108c3e1>] kswapd+0x3d1/0x55d [<c10449b5>] kthread+0x66/0x6b [<c1003fdf>] kernel_thread_helper+0x7/0x10 [<ffffffff>] 0xffffffff Two things are needed to fix this. First we need a method to tell fsnotify_create_event() to use GFP_NOFS and second we need to stop using one global IN_IGNORED event and allocate them one at a time. This solves current issues with multiple IN_IGNORED on a queue having tail drop problems and simplifies the allocations since we don't have to worry about two tasks opperating on the IGNORED event concurrently. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/notify/notification.c')
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index 2b20feaf263a..521368574e97 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -153,7 +153,7 @@ static bool event_compare(struct fsnotify_event *old, struct fsnotify_event *new
return true;
- return true;
+ return false;
return false;
@@ -345,18 +345,19 @@ static void initialize_event(struct fsnotify_event *event)
* @name the filename, if available
struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data,
- int data_type, const char *name, u32 cookie)
+ int data_type, const char *name, u32 cookie,
+ gfp_t gfp)
struct fsnotify_event *event;
- event = kmem_cache_alloc(fsnotify_event_cachep, GFP_KERNEL);
+ event = kmem_cache_alloc(fsnotify_event_cachep, gfp);
if (!event)
return NULL;
if (name) {
- event->file_name = kstrdup(name, GFP_KERNEL);
+ event->file_name = kstrdup(name, gfp);
if (!event->file_name) {
kmem_cache_free(fsnotify_event_cachep, event);
return NULL;