From 84c9c2de0626567c0d964ee5fa1ae3310911ddf8 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Tue, 5 May 2020 11:41:11 -0700 Subject: [PATCH] f2fs: correctly fix the parent inode number during fsync() fsync() may be called on a deleted file that's still open. So when fsync() tries to set the parent inode number when the inode has LOST_PINO and i_nlink == 1 (to avoid later checkpoints), it needs to make sure to get the parent directory via a non-deleted alias. Also remove the unnecessary igrab() and iput(), as the caller already holds a reference to the inode. Signed-off-by: Eric Biggers Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 175c66190087..81bfc5b44fa1 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -169,9 +169,11 @@ static int get_parent_ino(struct inode *inode, nid_t *pino) { struct dentry *dentry; - inode = igrab(inode); - dentry = d_find_any_alias(inode); - iput(inode); + /* + * Make sure to get the non-deleted alias. The alias associated with + * the open file descriptor being fsync()'ed may be deleted already. + */ + dentry = d_find_alias(inode); if (!dentry) return 0;