From: Mikulas Patocka mpatocka@redhat.com
commit a14e5ec66a7a66e57b24e2469f9212a78460207e upstream.
dm_bufio_get_device_size returns the device size in blocks. Before returning the value, we must subtract the nubmer of starting sectors. The number of starting sectors may not be divisible by block size.
Note that currently, no target is using dm_bufio_set_sector_offset and dm_bufio_get_device_size simultaneously, so this change has no effect. However, an upcoming dm-verity-fec fix needs this change.
Signed-off-by: Mikulas Patocka mpatocka@redhat.com Reviewed-by: Milan Broz gmazyland@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-bufio.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1438,6 +1438,10 @@ EXPORT_SYMBOL_GPL(dm_bufio_get_block_siz sector_t dm_bufio_get_device_size(struct dm_bufio_client *c) { sector_t s = i_size_read(c->bdev->bd_inode) >> SECTOR_SHIFT; + if (s >= c->start) + s -= c->start; + else + s = 0; if (likely(c->sectors_per_block_bits >= 0)) s >>= c->sectors_per_block_bits; else