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authorMikulas Patocka <mpatocka@redhat.com>2009-10-16 18:18:16 -0400
committerAlasdair G Kergon <agk@redhat.com>2009-10-16 18:18:16 -0400
commit3f2412dc85260e5aae7ebb03bf50d5b1407e3083 (patch)
treec736dc9a52677e29b4dfeb3061da5111edbb9454 /drivers/md/dm-snap.c
parentf88fb981183e71daf40bbd84bc8251bbf7b59e19 (diff)
dm snapshot: require non zero chunk size by end of ctr
If we are creating snapshot with memory-stored exception store, fail if the user didn't specify chunk size. Zero chunk size would probably crash a lot of places in the rest of snapshot code. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Jonathan Brassow <jbrassow@redhat.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r--drivers/md/dm-snap.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 53f4063f7ea4..9cb392b3e920 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -673,6 +673,11 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
673 bio_list_init(&s->queued_bios); 673 bio_list_init(&s->queued_bios);
674 INIT_WORK(&s->queued_bios_work, flush_queued_bios); 674 INIT_WORK(&s->queued_bios_work, flush_queued_bios);
675 675
676 if (!s->store->chunk_size) {
677 ti->error = "Chunk size not set";
678 goto bad_load_and_register;
679 }
680
676 /* Add snapshot to the list of snapshots for this origin */ 681 /* Add snapshot to the list of snapshots for this origin */
677 /* Exceptions aren't triggered till snapshot_resume() is called */ 682 /* Exceptions aren't triggered till snapshot_resume() is called */
678 if (register_snapshot(s)) { 683 if (register_snapshot(s)) {