From: Miao Xie <miaox@cn.fujitsu.com>
Date: Fri, 13 Jan 2012 00:10:12 +0000 (-0500)
Subject: Btrfs: fix btrfsck error 400 when truncating a compressed
X-Git-Tag: v3.3-rc1~26^2~7
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f70a9a6b94af86fca069a7552ab672c31b457786;p=pandora-kernel.git

Btrfs: fix btrfsck error 400 when truncating a compressed

Reproduce steps:
 # mkfs.btrfs /dev/sdb5
 # mount /dev/sdb5 -o compress=lzo /mnt
 # dd if=/dev/zero of=/mnt/tmpfile bs=128K count=1
 # sync
 # truncate -s 64K /mnt/tmpfile
 root 5 inode 257 errors 400

This is because of the wrong if condition, which is used to check if we should
subtract the bytes of the dropped range from i_blocks/i_bytes of i-node or not.
When we truncate a compressed extent, btrfs substracts the bytes of the whole
extent, it's wrong. We should substract the real size that we truncate, no
matter it is a compressed extent or not. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

Reading git-diff-tree failed