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| author | Jan Kara <jack@suse.cz> | 2019-02-01 14:21:23 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-13 14:03:18 -0700 |
| commit | 9c72acbe4940e1a542336daf9be2ca6493788e67 (patch) | |
| tree | 6e137be0ed7635021c75b1e073ba37dc102e51b8 /fs/btrfs/free-space-cache.c | |
| parent | 8d5b25551442ea58b129fb9a0a1c439894ceec0f (diff) | |
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
[ Upstream commit c27d82f52f75fc9d8d9d40d120d2a96fdeeada5e ]
When superblock has lots of inodes without any pagecache (like is the
case for /proc), drop_pagecache_sb() will iterate through all of them
without dropping sb->s_inode_list_lock which can lead to softlockups
(one of our customers hit this).
Fix the problem by going to the slow path and doing cond_resched() in
case the process needs rescheduling.
Link: http://lkml.kernel.org/r/20190114085343.15011-1-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/btrfs/free-space-cache.c')
0 files changed, 0 insertions, 0 deletions