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authorEric Sandeen <sandeen@redhat.com>2019-12-06 10:54:23 -0600
committerAl Viro <viro@zeniv.linux.org.uk>2019-12-18 00:03:01 -0500
commit04646aebd30b99f2cfa0182435a2ec252fcb16d0 (patch)
tree5b820d440100bf1c9ce8db4be85d73ceb503cdca /fs/drop_caches.c
parente0ff126ee7ad405c1ef531f9f3db92929de4f20f (diff)
downloadlinux-04646aebd30b99f2cfa0182435a2ec252fcb16d0.tar.bz2
fs: avoid softlockups in s_inodes iterators
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>
Diffstat (limited to 'fs/drop_caches.c')
-rw-r--r--fs/drop_caches.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index d31b6c72b476..dc1a1d5d825b 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -35,11 +35,11 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
spin_unlock(&inode->i_lock);
spin_unlock(&sb->s_inode_list_lock);
- cond_resched();
invalidate_mapping_pages(inode->i_mapping, 0, -1);
iput(toput_inode);
toput_inode = inode;
+ cond_resched();
spin_lock(&sb->s_inode_list_lock);
}
spin_unlock(&sb->s_inode_list_lock);