Patch "ext4: iterate over buffer heads correctly in move_extent_per_page()" has been added to the 4.4-stable tree

Patch "ext4: iterate over buffer heads correctly in move_extent_per_page()" has been added to the 4.4-stable tree

[gregkh]

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

    ext4: iterate over buffer heads correctly in move_extent_per_page()

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ext4-iterate-over-buffer-heads-correctly-in-move_extent_per_page.patch
and it can be found in the queue-4.4 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 6ffe77bad545f4a7c8edd2a4ee797ccfcd894ab4 Mon Sep 17 00:00:00 2001
From: Eryu Guan <guaneryu@gmail.com>
Date: Sun, 21 Feb 2016 18:38:44 -0500
Subject: ext4: iterate over buffer heads correctly in move_extent_per_page()

From: Eryu Guan <guaneryu@gmail.com>

commit 6ffe77bad545f4a7c8edd2a4ee797ccfcd894ab4 upstream.

In commit bcff24887d00 ("ext4: don't read blocks from disk after extents
being swapped") bh is not updated correctly in the for loop and wrong
data has been written to disk. generic/324 catches this on sub-page
block size ext4.

Fixes: bcff24887d00 ("ext4: don't read blocks from disk after extentsbeing swapped")
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -390,6 +390,7 @@ data_copy:
 		*err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0);
 		if (*err < 0)
 			break;
+		bh = bh->b_this_page;
 	}
 	if (!*err)
 		*err = block_commit_write(pagep[0], from, from + replaced_size);


Patches currently in stable-queue which might be from guaneryu@gmail.com are

queue-4.4/ext4-iterate-over-buffer-heads-correctly-in-move_extent_per_page.patch