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dm target:s introduce iterate devices fn

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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
This commit is contained in:
Mike Snitzer
2009-06-22 10:12:33 +01:00
committed by Alasdair G Kergon
parent 1197764e40
commit af4874e03e
7 changed files with 105 additions and 6 deletions
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18
drivers/md/dm-stripe.c
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@@ -313,15 +313,31 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
return error;
}
static int stripe_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
struct stripe_c *sc = ti->private;
int ret = 0;
unsigned i = 0;
do
ret = fn(ti, sc->stripe[i].dev,
sc->stripe[i].physical_start, data);
while (!ret && ++i < sc->stripes);
return ret;
}
static struct target_type stripe_target = {
.name = "striped",
.version = {1, 1, 0},
.version = {1, 2, 0},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
.map = stripe_map,
.end_io = stripe_end_io,
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
};
int __init dm_stripe_init(void)