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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 /include/linux/fsnotify_backend.h
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 'include/linux/fsnotify_backend.h')
-rw-r--r--include/linux/fsnotify_backend.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 6c3de999fb34..4d6f47b51189 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -352,7 +352,7 @@ extern void fsnotify_unmount_inodes(struct list_head *list);
352/* put here because inotify does some weird stuff when destroying watches */ 352/* put here because inotify does some weird stuff when destroying watches */
353extern struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, 353extern struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
354 void *data, int data_is, const char *name, 354 void *data, int data_is, const char *name,
355 u32 cookie); 355 u32 cookie, gfp_t gfp);
356 356
357#else 357#else
358 358