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| author | Kent Overstreet <koverstreet@google.com> | 2013-04-23 21:51:48 -0700 |
|---|---|---|
| committer | Kent Overstreet <koverstreet@google.com> | 2013-04-24 13:07:39 -0700 |
| commit | 8abb2a5dbadab91f9cae22270054e9ee3b3a1d2f (patch) | |
| tree | ef40e5ed1d1833152ca8b542a688f9664820201f /drivers/md/bcache/super.c | |
| parent | a09ded8edf9ed4009930713e101249084cbcea5c (diff) | |
| download | lwn-8abb2a5dbadab91f9cae22270054e9ee3b3a1d2f.tar.gz lwn-8abb2a5dbadab91f9cae22270054e9ee3b3a1d2f.zip | |
bcache: Make sure blocksize isn't smaller than device blocksize
Sanity check to make sure we don't end up doing IO the device doesn't
support.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
Diffstat (limited to 'drivers/md/bcache/super.c')
| -rw-r--r-- | drivers/md/bcache/super.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 6817ea46cf0a..b3601476f7dd 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -139,13 +139,17 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, if (bch_is_zero(sb->uuid, 16)) goto err; + sb->block_size = le16_to_cpu(s->block_size); + + err = "Superblock block size smaller than device block size"; + if (sb->block_size << 9 < bdev_logical_block_size(bdev)) + goto err; + switch (sb->version) { case BCACHE_SB_VERSION_BDEV: - sb->block_size = le16_to_cpu(s->block_size); sb->data_offset = BDEV_DATA_START_DEFAULT; break; case BCACHE_SB_VERSION_BDEV_WITH_OFFSET: - sb->block_size = le16_to_cpu(s->block_size); sb->data_offset = le64_to_cpu(s->data_offset); err = "Bad data offset"; |