This is a note to let you know that I've just added the patch titled

ext4: fix fdatasync(2) after fallocate(2) operation

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ext4-fix-fdatasync-2-after-fallocate-2-operation.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From c894aa97577e47d3066b27b32499ecf899bfa8b0 Mon Sep 17 00:00:00 2001

From: Eryu Guan eguan@redhat.com Date: Sun, 3 Dec 2017 22:52:51 -0500 Subject: ext4: fix fdatasync(2) after fallocate(2) operation

From: Eryu Guan eguan@redhat.com

commit c894aa97577e47d3066b27b32499ecf899bfa8b0 upstream.

Currently, fallocate(2) with KEEP_SIZE followed by a fdatasync(2) then crash, we'll see wrong allocated block number (stat -c %b), the blocks allocated beyond EOF are all lost. fstests generic/468 exposes this bug.

Commit 67a7d5f561f4 ("ext4: fix fdatasync(2) after extent manipulation operations") fixed all the other extent manipulation operation paths such as hole punch, zero range, collapse range etc., but forgot the fallocate case.

So similarly, fix it by recording the correct journal tid in ext4 inode in fallocate(2) path, so that ext4_sync_file() will wait for the right tid to be committed on fdatasync(2).

This addresses the test failure in xfstests test generic/468.

Signed-off-by: Eryu Guan eguan@redhat.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- fs/ext4/extents.c | 1 + 1 file changed, 1 insertion(+)

--- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4722,6 +4722,7 @@ retry: EXT4_INODE_EOFBLOCKS); } ext4_mark_inode_dirty(handle, inode); + ext4_update_inode_fsync_trans(handle, inode, 1); ret2 = ext4_journal_stop(handle); if (ret2) break;

Patches currently in stable-queue which might be from eguan@redhat.com are

queue-4.14/ext4-fix-fdatasync-2-after-fallocate-2-operation.patch