fs/ext4: Fix group descriptor checksum calculation
authorTuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Mon, 25 Sep 2017 19:06:31 +0000 (22:06 +0300)
committerTom Rini <trini@konsulko.com>
Fri, 6 Oct 2017 15:28:18 +0000 (11:28 -0400)
commit385b73185596cfc9e2acb74ab66abe91c06177f3
tree116142f27d11cf0472d47c9db69443b567ee38ad
parentbd2259e3c40c097c47e1dfc58a03b1df66b44840
fs/ext4: Fix group descriptor checksum calculation

The current code doesn't compute the group descriptor checksum correctly
for the filesystems that e2fsprogs 1.43.4 creates (they have
'Group descriptor size: 64' as reported by tune2fs). Extend the checksum
calculation to be done as ext4_group_desc_csum() does in Linux.

This fixes these errors in dmesg from running fs-test.sh and makes it
succeed again:

[1671902.620699] EXT4-fs (loop1): ext4_check_descriptors: Checksum for group 0 failed (35782!=10965)
[1671902.620706] EXT4-fs (loop1): group descriptors corrupted!

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
fs/ext4/ext4_common.c