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dm exception store: introduce registry

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Move exception stores into a registry.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2009-04-02 19:55:31 +01:00
committed by Alasdair G Kergon
parent 7513c2a761
commit 493df71c64
6 changed files with 307 additions and 49 deletions
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67
drivers/md/dm-snap-persistent.c
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@ -478,7 +478,7 @@ static void persistent_fraction_full(struct dm_exception_store *store,
*denominator = get_dev_size(store->snap->cow->bdev);
}
static void persistent_destroy(struct dm_exception_store *store)
static void persistent_dtr(struct dm_exception_store *store)
{
struct pstore *ps = get_info(store);
@ -656,7 +656,8 @@ static void persistent_drop_snapshot(struct dm_exception_store *store)
DMWARN("write header failed");
}
int dm_create_persistent(struct dm_exception_store *store)
static int persistent_ctr(struct dm_exception_store *store,
unsigned argc, char **argv)
{
struct pstore *ps;
@ -683,23 +684,69 @@ int dm_create_persistent(struct dm_exception_store *store)
return -ENOMEM;
}
store->type.dtr = persistent_destroy;
store->type.read_metadata = persistent_read_metadata;
store->type.prepare_exception = persistent_prepare_exception;
store->type.commit_exception = persistent_commit_exception;
store->type.drop_snapshot = persistent_drop_snapshot;
store->type.fraction_full = persistent_fraction_full;
store->context = ps;
return 0;
}
static int persistent_status(struct dm_exception_store *store,
status_type_t status, char *result,
unsigned int maxlen)
{
int sz = 0;
return sz;
}
static struct dm_exception_store_type _persistent_type = {
.name = "persistent",
.module = THIS_MODULE,
.ctr = persistent_ctr,
.dtr = persistent_dtr,
.read_metadata = persistent_read_metadata,
.prepare_exception = persistent_prepare_exception,
.commit_exception = persistent_commit_exception,
.drop_snapshot = persistent_drop_snapshot,
.fraction_full = persistent_fraction_full,
.status = persistent_status,
};
static struct dm_exception_store_type _persistent_compat_type = {
.name = "P",
.module = THIS_MODULE,
.ctr = persistent_ctr,
.dtr = persistent_dtr,
.read_metadata = persistent_read_metadata,
.prepare_exception = persistent_prepare_exception,
.commit_exception = persistent_commit_exception,
.drop_snapshot = persistent_drop_snapshot,
.fraction_full = persistent_fraction_full,
.status = persistent_status,
};
int dm_persistent_snapshot_init(void)
{
return 0;
int r;
r = dm_exception_store_type_register(&_persistent_type);
if (r) {
DMERR("Unable to register persistent exception store type");
return r;
}
r = dm_exception_store_type_register(&_persistent_compat_type);
if (r) {
DMERR("Unable to register old-style persistent exception "
"store type");
dm_exception_store_type_unregister(&_persistent_type);
return r;
}
return r;
}
void dm_persistent_snapshot_exit(void)
{
dm_exception_store_type_unregister(&_persistent_type);
dm_exception_store_type_unregister(&_persistent_compat_type);
}