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| author | Heinz Mauelshagen <heinzm@redhat.com> | 2014-10-17 13:38:50 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-10-21 09:32:15 -0400 |
| commit | 40d43c4b4cac4c2647bf07110d7b07d35f399a84 (patch) | |
| tree | c26181aac74dff7571e4c444c957ca8a8ccca9ae /kernel/smp.c | |
| parent | 9d28eb12447ee08bb5d1e8bb3195cf20e1ecd1c0 (diff) | |
| download | linux-40d43c4b4cac4c2647bf07110d7b07d35f399a84.tar.bz2 | |
dm raid: ensure superblock's size matches device's logical block size
The dm-raid superblock (struct dm_raid_superblock) is padded to 512
bytes and that size is being used to read it in from the metadata
device into one preallocated page.
Reading or writing this on a 512-byte sector device works fine but on
a 4096-byte sector device this fails.
Set the dm-raid superblock's size to the logical block size of the
metadata device, because IO at that size is guaranteed too work. Also
add a size check to avoid silent partial metadata loss in case the
superblock should ever grow past the logical block size or PAGE_SIZE.
[includes pointer math fix from Dan Carpenter]
Reported-by: "Liuhua Wang" <lwang@suse.com>
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'kernel/smp.c')
0 files changed, 0 insertions, 0 deletions