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Eric Sandeen 2d300cb3bd fs: call fsnotify_sb_delete after evict_inodes 
[ Upstream commit 1edc8eb2e9 ]

When a filesystem is unmounted, we currently call fsnotify_sb_delete()
before evict_inodes(), which means that fsnotify_unmount_inodes()
must iterate over all inodes on the superblock looking for any inodes
with watches.  This is inefficient and can lead to livelocks as it
iterates over many unwatched inodes.

At this point, SB_ACTIVE is gone and dropping refcount to zero kicks
the inode out out immediately, so anything processed by
fsnotify_sb_delete / fsnotify_unmount_inodes gets evicted in that loop.

After that, the call to evict_inodes will evict everything else with a
zero refcount.

This should speed things up overall, and avoid livelocks in
fsnotify_unmount_inodes().

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-01-12 12:21:38 +01:00
..
dnotify selinux/stable-5.4 PR 20190917 2019-09-23 11:21:04 -07:00
fanotify selinux/stable-5.4 PR 20190917 2019-09-23 11:21:04 -07:00
inotify selinux/stable-5.4 PR 20190917 2019-09-23 11:21:04 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fdinfo.c fsnotify/fdinfo: include fdinfo.h for inotify_show_fdinfo() 2018-11-15 17:34:27 +01:00
fdinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fsnotify.c fs: call fsnotify_sb_delete after evict_inodes 2020-01-12 12:21:38 +01:00
fsnotify.h notify: export symbols for use by the knfsd file cache 2019-08-19 11:00:39 -04:00
group.c notify: export symbols for use by the knfsd file cache 2019-08-19 11:00:39 -04:00
mark.c notify: export symbols for use by the knfsd file cache 2019-08-19 11:00:39 -04:00
notification.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00