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| author | Eric Sandeen <sandeen@redhat.com> | 2019-12-06 19:54:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-12 14:21:37 +0300 |
| commit | 16b730a459ca744cd7d3d33954caaa43da8cb3a2 (patch) | |
| tree | e3255b52e5f047cd457c4bcf93f9520b1f465ac0 /fs/notify | |
| parent | 2ac95310fe5896cae413e4ae06b3af21645979d9 (diff) | |
| download | linux-16b730a459ca744cd7d3d33954caaa43da8cb3a2.tar.xz | |
fs: avoid softlockups in s_inodes iterators
[ Upstream commit 04646aebd30b99f2cfa0182435a2ec252fcb16d0 ]
Anything that walks all inodes on sb->s_inodes list without rescheduling
risks softlockups.
Previous efforts were made in 2 functions, see:
c27d82f fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
ac05fbb inode: don't softlockup when evicting inodes
but there hasn't been an audit of all walkers, so do that now. This
also consistently moves the cond_resched() calls to the bottom of each
loop in cases where it already exists.
One loop remains: remove_dquot_ref(), because I'm not quite sure how
to deal with that one w/o taking the i_lock.
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>
Diffstat (limited to 'fs/notify')
| -rw-r--r-- | fs/notify/fsnotify.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 2ecef6155fc0..ac9eb273e28c 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -77,6 +77,7 @@ static void fsnotify_unmount_inodes(struct super_block *sb) iput_inode = inode; + cond_resched(); spin_lock(&sb->s_inode_list_lock); } spin_unlock(&sb->s_inode_list_lock); |