[PATCH] ext4: Mark inodes without acls in __ext4_iget()

[Jan Kara <jack@suse.cz>]

Mark inodes without acls with cache_no_acl() in __ext4_iget() so that
path lookup can run in RCU mode from the start. This is interesting in
particular for the case where the file owner does the lookup because in
that case end up constantly hitting the slow path otherwise. We drop out
from the fast path (because ACL state is unknown) but never end up calling
check_acl() to cache ACL state.

The problem was originally analyzed by Linus and fix tested by Matheusz,
I'm just putting it into mergeable form :).

Link: https://lore.kernel.org/all/CAHk-=whSzc75TLLPWskV0xuaHR4tpWBr=LduqhcCFr4kCmme_w@mail.gmail.com
Reported-by: Mateusz Guzik <mjguzik@gmail.com>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/inode.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e99306a8f47c..2b68d0651652 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5521,7 +5521,9 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
 	if (ret)
 		goto bad_inode;
 	brelse(iloc.bh);
-
+	/* Initialize the "no ACL's" state for the simple cases */
+	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) && !ei->i_file_acl)
+		cache_no_acl(inode);
 	unlock_new_inode(inode);
 	return inode;
 
-- 
2.51.0