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| author | Amir Goldstein <amir73il@gmail.com> | 2021-03-04 13:48:23 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-03-16 18:14:28 +0300 |
| commit | 8988f11abb820bacfcc53d498370bfb30f792ec4 (patch) | |
| tree | 00f938ddb78faf853b1ffe3c8ca21e58f670e781 /include/linux/fsnotify_backend.h | |
| parent | 6f73171e192366ff7c98af9fb50615ef9615f8a7 (diff) | |
| download | linux-8988f11abb820bacfcc53d498370bfb30f792ec4.tar.xz | |
fanotify: reduce event objectid to 29-bit hash
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>
Diffstat (limited to 'include/linux/fsnotify_backend.h')
| -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 |