Commit ac1f0ac2 authored by Milan Broz's avatar Milan Broz Committed by Alasdair G Kergon
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dm log: ensure log bitmap fits on log device 



Check that the log bitmap will fit within the log device.

Signed-off-by: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 2045e88e

drivers/md/dm-log.c

+8 −0
Original line number Diff line number Diff line
@@ -457,6 +457,14 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 
		 */

		buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +

				       bitset_size, ti->limits.hardsect_size);



		if (buf_size > dev->bdev->bd_inode->i_size) {

			DMWARN("log device %s too small: need %llu bytes",

				dev->name, (unsigned long long)buf_size);

			kfree(lc);

			return -EINVAL;

		}



		lc->header_location.count = buf_size >> SECTOR_SHIFT;



		lc->io_req.mem.type = DM_IO_VMA;