dm target:s introduce iterate devices fn
Add .iterate_devices to 'struct target_type' to allow a function to be
called for all devices in a DM target. Implemented it for all targets
except those in dm-snap.c (origin and snapshot).
(The raid1 version number jumps to 1.12 because we originally reserved
1.1 to 1.11 for 'block_on_error' but ended up using 'handle_errors'
instead.)
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: martin.petersen@oracle.com
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index ecbb174..9184b6de 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -134,9 +134,17 @@
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
+static int linear_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct linear_c *lc = ti->private;
+
+ return fn(ti, lc->dev, lc->start, data);
+}
+
static struct target_type linear_target = {
.name = "linear",
- .version= {1, 0, 3},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = linear_ctr,
.dtr = linear_dtr,
@@ -144,6 +152,7 @@
.status = linear_status,
.ioctl = linear_ioctl,
.merge = linear_merge,
+ .iterate_devices = linear_iterate_devices,
};
int __init dm_linear_init(void)