diff options
author | Alex Shi <alex.shi@linaro.org> | 2016-04-13 12:02:21 +0800 |
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committer | Alex Shi <alex.shi@linaro.org> | 2016-04-13 12:02:21 +0800 |
commit | 08562bfcb85748c69e5824fc6d1d77d5725787e4 (patch) | |
tree | 905e39ccad43e244dbb09d4eccce1c91e0facce0 /drivers/md/dm-snap.c | |
parent | 9fe9bdd75b2ad9ed25152fce02f41fe63c542e8a (diff) | |
parent | ad592b70ae97800d4f5bf535d45a680649e2789e (diff) |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
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 3766386080a4..e4d1bafe78c1 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"; |