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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 14:11:59 +0300 |
| commit | 61855d6805ae078ae6bba561e6e76715436d776d (patch) | |
| tree | a1fc46f6a66e74d25962e984ac71068de8cb3e87 /fs/quota | |
| parent | 396bf8fe4f679d8e457867b9ff60ee5fd6d99d42 (diff) | |
| download | linux-61855d6805ae078ae6bba561e6e76715436d776d.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/quota')
| -rw-r--r-- | fs/quota/dquot.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 3fdbdd29702b..30f5da8f4aff 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -976,6 +976,7 @@ static int add_dquot_ref(struct super_block *sb, int type) * later. */ old_inode = inode; + cond_resched(); spin_lock(&sb->s_inode_list_lock); } spin_unlock(&sb->s_inode_list_lock); |