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| author | Mikulas Patocka <mpatocka@redhat.com> | 2010-08-12 05:13:50 +0200 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2010-08-12 05:13:50 +0200 |
| commit | 1e5554c8428bc7209a83e2d07ca724be4d981ce3 (patch) | |
| tree | c434fd684132ae502880dc745b1982fc3ca94db0 /drivers/md/dm-snap.c | |
| parent | dm mpath: fix NULL pointer dereference when path parameters missing (diff) | |
| download | linux-1e5554c8428bc7209a83e2d07ca724be4d981ce3.tar.xz linux-1e5554c8428bc7209a83e2d07ca724be4d981ce3.zip | |
dm snapshot: iterate origin and cow devices
Iterate both origin and snapshot devices
iterate_devices method should call the callback for all the devices where
the bio may be remapped. Thus, snapshot_iterate_devices should call the callback
for both snapshot and origin underlying devices because it remaps some bios
to the snapshot and some to the origin.
snapshot_iterate_devices called the callback only for the origin device.
This led to badly calculated device limits if snapshot and origin were placed
on different types of disks.
Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@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.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 54853773510c..a6ab98920cc3 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1899,8 +1899,14 @@ static int snapshot_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { struct dm_snapshot *snap = ti->private; + int r; + + r = fn(ti, snap->origin, 0, ti->len, data); - return fn(ti, snap->origin, 0, ti->len, data); + if (!r) + r = fn(ti, snap->cow, 0, get_dev_size(snap->cow->bdev), data); + + return r; } |