diff options
| author |   Eric Sandeen <sandeen@redhat.com> | 2019-12-06 10:55:59 -0600 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2019-12-18 00:03:01 -0500 |
| commit | 1edc8eb2e93130e36ac74ac9c80913815a57d413 (patch) | |
| tree | 11eb2e97e44475cad56618264e9345f85d1132b8 /fs/super.c | |
| parent | fs: avoid softlockups in s_inodes iterators (diff) | |
| download | linux-dev-1edc8eb2e93130e36ac74ac9c80913815a57d413.tar.xz linux-dev-1edc8eb2e93130e36ac74ac9c80913815a57d413.zip | |
fs: call fsnotify_sb_delete after evict_inodes
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>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/super.c b/fs/super.c index cfadab2cbf35..cd352530eca9 100644 --- a/fs/super.c +++ b/fs/super.c @@ -448,10 +448,12 @@ void generic_shutdown_super(struct super_block *sb) sync_filesystem(sb); sb->s_flags &= ~SB_ACTIVE; - fsnotify_sb_delete(sb); cgroup_writeback_umount(); + /* evict all inodes with zero refcount */ evict_inodes(sb); + /* only nonzero refcount inodes can have marks */ + fsnotify_sb_delete(sb); if (sb->s_dio_done_wq) { destroy_workqueue(sb->s_dio_done_wq); |