diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-04-16 15:30:54 -0300 |
---|---|---|
committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-04-16 15:30:54 -0300 |
commit | bdcfd44fb5b5fb8fd660e7f93f1095c507481024 (patch) | |
tree | e423b07154d422b711ddfadedb87c43317d3c4f6 /drivers/md/dm-snap.c | |
parent | 4a327fcef90ba27150a3e8741441b68c605ae248 (diff) |
Linux-libre 4.5.1-gnupck-4.5.1-gnu
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r-- | drivers/md/dm-snap.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 376638608..e4d1bafe7 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1105,6 +1105,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv) int i; int r = -EINVAL; char *origin_path, *cow_path; + dev_t origin_dev, cow_dev; unsigned args_used, num_flush_bios = 1; fmode_t origin_mode = FMODE_READ; @@ -1135,11 +1136,19 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv) ti->error = "Cannot get origin device"; goto bad_origin; } + origin_dev = s->origin->bdev->bd_dev; cow_path = argv[0]; argv++; argc--; + cow_dev = dm_get_dev_t(cow_path); + if (cow_dev && cow_dev == origin_dev) { + ti->error = "COW device cannot be the same as origin device"; + r = -EINVAL; + goto bad_cow; + } + r = dm_get_device(ti, cow_path, dm_table_get_mode(ti->table), &s->cow); if (r) { ti->error = "Cannot get COW device"; |