From 6ae4c5a69877e5afb6ce63f7d82432133934073a Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 5 Sep 2016 23:21:43 -0400 Subject: [PATCH] ext4: cleanup ext4_sync_parent() A condition !hlist_empty(&inode->i_dentry) is always true for open file. Just remove it. Also ext4_sync_parent() could use some explanation why races with rmdir() are not an issue - add a comment explaining that. Reported-by: Al Viro Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o --- fs/ext4/fsync.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c index 5c4372512ef7..88effb1053c7 100644 --- a/fs/ext4/fsync.c +++ b/fs/ext4/fsync.c @@ -61,6 +61,13 @@ static int ext4_sync_parent(struct inode *inode) break; iput(inode); inode = next; + /* + * The directory inode may have gone through rmdir by now. But + * the inode itself and its blocks are still allocated (we hold + * a reference to the inode so it didn't go through + * ext4_evict_inode()) and so we are safe to flush metadata + * blocks and the inode. + */ ret = sync_mapping_buffers(inode->i_mapping); if (ret) break; @@ -107,7 +114,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync) if (!journal) { ret = __generic_file_fsync(file, start, end, datasync); - if (!ret && !hlist_empty(&inode->i_dentry)) + if (!ret) ret = ext4_sync_parent(inode); if (test_opt(inode->i_sb, BARRIER)) goto issue_flush; -- 2.20.1