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[3.13.y-ckt,38/43] ext4: iterate over buffer heads correctly in move_extent_per_page()

Message ID 1458680638-23644-39-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 22, 2016, 9:03 p.m. UTC 
3.13.11-ckt37 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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: Kamal Mostafa <kamal@canonical.com>
---
 fs/ext4/move_extent.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 66c1449..78c76e0 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -1037,6 +1037,7 @@  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);