From: Amir Goldstein amir73il@gmail.com
[ Upstream commit 007d1e8395eaa59b0e7ad9eb2b53a40859446a88 ]
FS_EVENT_ON_CHILD gets a special treatment in fsnotify() because it is not a flag specifying an event type, but rather an extra flags that may be reported along with another event and control the handling of the event by the backend.
FS_ISDIR is also an "extra flag" and not an "event type" and therefore desrves the same treatment. With inotify/dnotify backends it was never possible to set FS_ISDIR in mark masks, so it did not matter. With fanotify backend, mark adding code jumps through hoops to avoid setting the FS_ISDIR in the commulative object mask.
Separate the constant ALL_FSNOTIFY_EVENTS to ALL_FSNOTIFY_FLAGS and ALL_FSNOTIFY_EVENTS, so the latter can be used to test for specific event types.
Signed-off-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/notify/fsnotify.c | 7 +++---- include/linux/fsnotify_backend.h | 9 +++++++-- 2 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 506da82ff3f1..dc080c642dd0 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -192,7 +192,7 @@ static int send_to_group(struct inode *to_tell, struct fsnotify_iter_info *iter_info) { struct fsnotify_group *group = NULL; - __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); + __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); __u32 marks_mask = 0; __u32 marks_ignored_mask = 0;
@@ -256,8 +256,7 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, struct fsnotify_iter_info iter_info; struct mount *mnt; int ret = 0; - /* global tests shouldn't care about events on child only the specific event */ - __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); + __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS);
if (data_is == FSNOTIFY_EVENT_PATH) mnt = real_mount(((const struct path *)data)->mnt); @@ -380,7 +379,7 @@ static __init int fsnotify_init(void) { int ret;
- BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 23); + BUG_ON(hweight32(ALL_FSNOTIFY_BITS) != 23);
ret = init_srcu_struct(&fsnotify_mark_srcu); if (ret) diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index ce74278a454a..81052313adeb 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -67,15 +67,20 @@
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
+/* Events that can be reported to backends */ #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \ FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \ FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \ FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \ FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \ - FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \ - FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \ + FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME) + +/* Extra flags that may be reported with event or control handling of events */ +#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \ FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
+#define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS) + struct fsnotify_group; struct fsnotify_event; struct fsnotify_mark;