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| author | Amir Goldstein <amir73il@gmail.com> | 2021-03-04 13:48:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-21 15:53:06 +0300 |
| commit | 5b57a2b74d01c6f2c3698697f7beedd0ccf25f12 (patch) | |
| tree | 89c23d9b89719c7ee2ab30ee7ee90a784f652f02 /include | |
| parent | 4f14948942937eeb2f4c363f5912d143049cdf26 (diff) | |
| download | linux-5b57a2b74d01c6f2c3698697f7beedd0ccf25f12.tar.xz | |
fanotify: reduce event objectid to 29-bit hash
[ Upstream commit 8988f11abb820bacfcc53d498370bfb30f792ec4 ]
objectid is only used by fanotify backend and it is just an optimization
for event merge before comparing all fields in event.
Move the objectid member from common struct fsnotify_event into struct
fanotify_event and reduce it to 29-bit hash to cram it together with the
3-bit event type.
Events of different types are never merged, so the combination of event
type and hash form a 32-bit key for fast compare of events.
This reduces the size of events by one pointer and paves the way for
adding hashed queue support for fanotify.
Link: https://lore.kernel.org/r/20210304104826.3993892-3-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fsnotify_backend.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 7eb979bfc141..fc98f9f88d12 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -167,7 +167,6 @@ struct fsnotify_ops { */ struct fsnotify_event { struct list_head list; - unsigned long objectid; /* identifier for queue merges */ }; /* @@ -582,11 +581,9 @@ extern void fsnotify_put_mark(struct fsnotify_mark *mark); extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info); extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info); -static inline void fsnotify_init_event(struct fsnotify_event *event, - unsigned long objectid) +static inline void fsnotify_init_event(struct fsnotify_event *event) { INIT_LIST_HEAD(&event->list); - event->objectid = objectid; } #else |