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authorJan Kara <jack@suse.cz>2016-12-16 10:53:32 +0100
committerJan Kara <jack@suse.cz>2017-04-10 17:37:34 +0200
commitc1f33073ac1b33510e956de7181438515e438db0 (patch)
tree01feda16ddcbb3d22f9d9862e6598b6edc9d7aa0 /fs/notify/mark.c
parent43471d15df0e7c40ca4df1513fc1dcf5765396ac (diff)
fsnotify: Update comments
Add a comment that lifetime of a notification mark is protected by SRCU and remove a comment about clearing of marks attached to the inode. It is stale and more uptodate version is at fsnotify_destroy_marks() which is the function handling this case. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/mark.c')
-rw-r--r--fs/notify/mark.c13
1 files changed, 1 insertions, 12 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 6043306e8e21..44836e539169 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -51,7 +51,7 @@
*
* LIFETIME:
* Inode marks survive between when they are added to an inode and when their
- * refcnt==0.
+ * refcnt==0. Marks are also protected by fsnotify_mark_srcu.
*
* The inode mark can be cleared for a number of different reasons including:
* - The inode is unlinked for the last time. (fsnotify_inode_remove)
@@ -61,17 +61,6 @@
* - The fsnotify_group associated with the mark is going away and all such marks
* need to be cleaned up. (fsnotify_clear_marks_by_group)
*
- * Worst case we are given an inode and need to clean up all the marks on that
- * inode. We take i_lock and walk the i_fsnotify_marks safely. For each
- * mark on the list we take a reference (so the mark can't disappear under us).
- * We remove that mark form the inode's list of marks and we add this mark to a
- * private list anchored on the stack using i_free_list; we walk i_free_list
- * and before we destroy the mark we make sure that we dont race with a
- * concurrent destroy_group by getting a ref to the marks group and taking the
- * groups mutex.
-
- * Very similarly for freeing by group, except we use free_g_list.
- *
* This has the very interesting property of being able to run concurrently with
* any (or all) other directions.
*/