Messages in this thread | | | Subject | Re: [PATCH 028/270] ext4: remove erroneous ext4_superblock_csum_set() in update_backups() | From | Ben Hutchings <> | Date | Tue, 27 Nov 2012 02:22:19 +0000 |
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On Mon, 2012-11-26 at 14:55 -0200, Herton Ronaldo Krzesinski wrote: > 3.5.7u1 -stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Tao Ma <boyu.mt@taobao.com> > > commit bef53b01faeb791e27605cba1a71ba21364cb23e upstream. > > The update_backups() function is used to backup all the metadata > blocks, so we should not take it for granted that 'data' is pointed to > a super block and use ext4_superblock_csum_set to calculate the > checksum there. In case where the data is a group descriptor block, > it will corrupt the last group descriptor, and then e2fsck will > complain about it it. > > As all the metadata checksums should already be OK when we do the > backup, remove the wrong ext4_superblock_csum_set and it should be > just fine. > > Reported-by: "Theodore Ts'o" <tytso@mit.edu> > Signed-off-by: Tao Ma <boyu.mt@taobao.com> > Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> > [ herton: adjust context ] > Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
This should also be applicable to 3.6.
Ben.
> --- > fs/ext4/resize.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c > index b0bdd10..dc1affc 100644 > --- a/fs/ext4/resize.c > +++ b/fs/ext4/resize.c > @@ -979,8 +979,6 @@ static void update_backups(struct super_block *sb, > goto exit_err; > } > > - ext4_superblock_csum_set(sb, (struct ext4_super_block *)data); > - > while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { > struct buffer_head *bh; >
-- Ben Hutchings Never attribute to conspiracy what can adequately be explained by stupidity. [unhandled content-type:application/pgp-signature] | |