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authorMike Snitzer <snitzer@redhat.com>2009-06-22 13:12:33 +0400
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 13:12:33 +0400
commitaf4874e03ed82f050d5872d8c39ce64bf16b5c38 (patch)
tree38aa5dee43b4bb7a369995d4f38dee992cb051e0 /drivers/md/dm-mpath.c
parent1197764e403d97231eb6da2b1e16f511a7fd3101 (diff)
downloadlinux-af4874e03ed82f050d5872d8c39ce64bf16b5c38.tar.xz
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
Diffstat (limited to 'drivers/md/dm-mpath.c')
-rw-r--r--drivers/md/dm-mpath.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 890c0e8ed13e..f8aeaaa54afe 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1450,12 +1450,32 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
+static int multipath_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct multipath *m = ti->private;
+ struct priority_group *pg;
+ struct pgpath *p;
+ int ret = 0;
+
+ list_for_each_entry(pg, &m->priority_groups, list) {
+ list_for_each_entry(p, &pg->pgpaths, list) {
+ ret = fn(ti, p->path.dev, ti->begin, data);
+ if (ret)
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
/*-----------------------------------------------------------------
* Module setup
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 0, 5},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
@@ -1466,6 +1486,7 @@ static struct target_type multipath_target = {
.status = multipath_status,
.message = multipath_message,
.ioctl = multipath_ioctl,
+ .iterate_devices = multipath_iterate_devices,
};
static int __init dm_multipath_init(void)