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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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11
drivers/md/dm-crypt.c
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@ -1313,9 +1313,17 @@ static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
static int crypt_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
struct crypt_config *cc = ti->private;
return fn(ti, cc->dev, cc->start, data);
}
static struct target_type crypt_target = {
.name = "crypt",
.version= {1, 6, 0},
.version = {1, 7, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
@ -1326,6 +1334,7 @@ static struct target_type crypt_target = {
.resume = crypt_resume,
.message = crypt_message,
.merge = crypt_merge,
.iterate_devices = crypt_iterate_devices,
};
static int __init dm_crypt_init(void)