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| author | Jan Kara <jack@suse.cz> | 2016-12-21 14:48:18 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-04-10 17:37:36 +0200 |
| commit | f09b04a03e0239f65bd964a1de758e53cf6349e8 (patch) | |
| tree | dc8f9b75eb2f98fee22d48e516a3734035868c69 | |
| parent | 6b3f05d24d355f50f3d9814304650fcab0efb482 (diff) | |
| download | op-kernel-dev-f09b04a03e0239f65bd964a1de758e53cf6349e8.zip op-kernel-dev-f09b04a03e0239f65bd964a1de758e53cf6349e8.tar.gz | |
fsnotify: Remove special handling of mark destruction on group shutdown
Currently we queue all marks for destruction on group shutdown and then
destroy them from fsnotify_destroy_group() instead from a worker thread
which is the usual path. However worker can already be processing some
list of marks to destroy so this does not make 100% all marks are really
destroyed by the time group is shut down. This isn't a big problem as
each mark holds group reference and thus group stays partially alive
until all marks are really freed but there's no point in complicating
our lives - just wait for the delayed work to be finished instead.
Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/notify/fsnotify.h | 6 | ||||
| -rw-r--r-- | fs/notify/group.c | 10 | ||||
| -rw-r--r-- | fs/notify/mark.c | 7 |
3 files changed, 12 insertions, 11 deletions
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index 72050b7..2a92dc0 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -36,10 +36,8 @@ static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) } /* prepare for freeing all marks associated with given group */ extern void fsnotify_detach_group_marks(struct fsnotify_group *group); -/* - * wait for fsnotify_mark_srcu period to end and free all marks in destroy_list - */ -extern void fsnotify_mark_destroy_list(void); +/* Wait until all marks queued for destruction are destroyed */ +extern void fsnotify_wait_marks_destroyed(void); /* * update the dentry->d_flags of all of inode's children to indicate if inode cares diff --git a/fs/notify/group.c b/fs/notify/group.c index fbe3cbe..0fb4aad 100644 --- a/fs/notify/group.c +++ b/fs/notify/group.c @@ -66,14 +66,16 @@ void fsnotify_destroy_group(struct fsnotify_group *group) */ fsnotify_group_stop_queueing(group); - /* clear all inode marks for this group, attach them to destroy_list */ + /* Clear all marks for this group and queue them for destruction */ fsnotify_detach_group_marks(group); /* - * Wait for fsnotify_mark_srcu period to end and free all marks in - * destroy_list + * Wait until all marks get really destroyed. We could actually destroy + * them ourselves instead of waiting for worker to do it, however that + * would be racy as worker can already be processing some marks before + * we even entered fsnotify_destroy_group(). */ - fsnotify_mark_destroy_list(); + fsnotify_wait_marks_destroyed(); /* * Since we have waited for fsnotify_mark_srcu in diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 21c7791..f916b71 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -703,7 +703,7 @@ void fsnotify_init_mark(struct fsnotify_mark *mark, * Destroy all marks in destroy_list, waits for SRCU period to finish before * actually freeing marks. */ -void fsnotify_mark_destroy_list(void) +static void fsnotify_mark_destroy_workfn(struct work_struct *work) { struct fsnotify_mark *mark, *next; struct list_head private_destroy_list; @@ -721,7 +721,8 @@ void fsnotify_mark_destroy_list(void) } } -static void fsnotify_mark_destroy_workfn(struct work_struct *work) +/* Wait for all marks queued for destruction to be actually destroyed */ +void fsnotify_wait_marks_destroyed(void) { - fsnotify_mark_destroy_list(); + flush_delayed_work(&reaper_work); } |
