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fsnotify: generalize handling of extra event flags 

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>
hifive-unleashed-5.1
Amir Goldstein 2018-10-04 00:25:33 +03:00 committed by Jan Kara
parent b723a7911d
commit 007d1e8395
2 changed files with 10 additions and 6 deletions
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7
fs/notify/fsnotify.c
View File

@ -196,7 +196,7 @@ 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;
struct fsnotify_mark *mark;
@ -329,8 +329,7 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
struct mount *mnt = NULL;
__u32 mnt_or_sb_mask = 0;
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);
@ -396,7 +395,7 @@ 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)

9
include/linux/fsnotify_backend.h
View File

@ -68,15 +68,20 @@
#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;