The patch below does not apply to the 4.5-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 87f9a031af48defee9f34c6aaf06d6f1988c244d Mon Sep 17 00:00:00 2001
From: Eryu Guan <guaneryu@xxxxxxxxx>
Date: Sun, 21 Feb 2016 18:38:44 -0500
Subject: [PATCH] ext4: iterate over buffer heads correctly in
move_extent_per_page()
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@xxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index e032a0423e35..4098acc701c3 100644
--- 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);
--
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