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path: root/drivers/md/dm-snap-transient.c
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Diffstat (limited to 'drivers/md/dm-snap-transient.c')
-rw-r--r--drivers/md/dm-snap-transient.c86
1 files changed, 69 insertions, 17 deletions
diff --git a/drivers/md/dm-snap-transient.c b/drivers/md/dm-snap-transient.c
index 7f6e2e6dcb0d..cde5aa558e6d 100644
--- a/drivers/md/dm-snap-transient.c
+++ b/drivers/md/dm-snap-transient.c
@@ -6,7 +6,6 @@
*/
#include "dm-exception-store.h"
-#include "dm-snap.h"
#include <linux/mm.h>
#include <linux/pagemap.h>
@@ -23,7 +22,7 @@ struct transient_c {
sector_t next_free;
};
-static void transient_destroy(struct dm_exception_store *store)
+static void transient_dtr(struct dm_exception_store *store)
{
kfree(store->context);
}
@@ -39,14 +38,14 @@ static int transient_read_metadata(struct dm_exception_store *store,
static int transient_prepare_exception(struct dm_exception_store *store,
struct dm_snap_exception *e)
{
- struct transient_c *tc = (struct transient_c *) store->context;
- sector_t size = get_dev_size(store->snap->cow->bdev);
+ struct transient_c *tc = store->context;
+ sector_t size = get_dev_size(store->cow->bdev);
- if (size < (tc->next_free + store->snap->chunk_size))
+ if (size < (tc->next_free + store->chunk_size))
return -1;
- e->new_chunk = sector_to_chunk(store->snap, tc->next_free);
- tc->next_free += store->snap->chunk_size;
+ e->new_chunk = sector_to_chunk(store, tc->next_free);
+ tc->next_free += store->chunk_size;
return 0;
}
@@ -64,20 +63,14 @@ static void transient_fraction_full(struct dm_exception_store *store,
sector_t *numerator, sector_t *denominator)
{
*numerator = ((struct transient_c *) store->context)->next_free;
- *denominator = get_dev_size(store->snap->cow->bdev);
+ *denominator = get_dev_size(store->cow->bdev);
}
-int dm_create_transient(struct dm_exception_store *store)
+static int transient_ctr(struct dm_exception_store *store,
+ unsigned argc, char **argv)
{
struct transient_c *tc;
- store->destroy = transient_destroy;
- store->read_metadata = transient_read_metadata;
- store->prepare_exception = transient_prepare_exception;
- store->commit_exception = transient_commit_exception;
- store->drop_snapshot = NULL;
- store->fraction_full = transient_fraction_full;
-
tc = kmalloc(sizeof(struct transient_c), GFP_KERNEL);
if (!tc)
return -ENOMEM;
@@ -88,11 +81,70 @@ int dm_create_transient(struct dm_exception_store *store)
return 0;
}
+static unsigned transient_status(struct dm_exception_store *store,
+ status_type_t status, char *result,
+ unsigned maxlen)
+{
+ unsigned sz = 0;
+
+ switch (status) {
+ case STATUSTYPE_INFO:
+ break;
+ case STATUSTYPE_TABLE:
+ DMEMIT(" %s N %llu", store->cow->name,
+ (unsigned long long)store->chunk_size);
+ }
+
+ return sz;
+}
+
+static struct dm_exception_store_type _transient_type = {
+ .name = "transient",
+ .module = THIS_MODULE,
+ .ctr = transient_ctr,
+ .dtr = transient_dtr,
+ .read_metadata = transient_read_metadata,
+ .prepare_exception = transient_prepare_exception,
+ .commit_exception = transient_commit_exception,
+ .fraction_full = transient_fraction_full,
+ .status = transient_status,
+};
+
+static struct dm_exception_store_type _transient_compat_type = {
+ .name = "N",
+ .module = THIS_MODULE,
+ .ctr = transient_ctr,
+ .dtr = transient_dtr,
+ .read_metadata = transient_read_metadata,
+ .prepare_exception = transient_prepare_exception,
+ .commit_exception = transient_commit_exception,
+ .fraction_full = transient_fraction_full,
+ .status = transient_status,
+};
+
int dm_transient_snapshot_init(void)
{
- return 0;
+ int r;
+
+ r = dm_exception_store_type_register(&_transient_type);
+ if (r) {
+ DMWARN("Unable to register transient exception store type");
+ return r;
+ }
+
+ r = dm_exception_store_type_register(&_transient_compat_type);
+ if (r) {
+ DMWARN("Unable to register old-style transient "
+ "exception store type");
+ dm_exception_store_type_unregister(&_transient_type);
+ return r;
+ }
+
+ return r;
}
void dm_transient_snapshot_exit(void)
{
+ dm_exception_store_type_unregister(&_transient_type);
+ dm_exception_store_type_unregister(&_transient_compat_type);
}