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dm snapshot: extend exception store functions

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Supply dm_add_exception as a callback to the read_metadata function.
Add a status function ready for a later patch and name the functions
consistently.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2009-01-06 03:05:19 +00:00
committed by Alasdair G Kergon
parent 4db6bfe02b
commit a159c1ac5f
6 changed files with 55 additions and 37 deletions
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21
drivers/md/dm-snap-transient.c
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@@ -28,13 +28,16 @@ static void transient_destroy(struct dm_exception_store *store)
kfree(store->context);
}
static int transient_read_metadata(struct dm_exception_store *store)
static int transient_read_metadata(struct dm_exception_store *store,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context)
{
return 0;
}
static int transient_prepare(struct dm_exception_store *store,
struct dm_snap_exception *e)
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);
@@ -48,10 +51,10 @@ static int transient_prepare(struct dm_exception_store *store,
return 0;
}
static void transient_commit(struct dm_exception_store *store,
struct dm_snap_exception *e,
void (*callback) (void *, int success),
void *callback_context)
static void transient_commit_exception(struct dm_exception_store *store,
struct dm_snap_exception *e,
void (*callback) (void *, int success),
void *callback_context)
{
/* Just succeed */
callback(callback_context, 1);
@@ -70,8 +73,8 @@ int dm_create_transient(struct dm_exception_store *store)
store->destroy = transient_destroy;
store->read_metadata = transient_read_metadata;
store->prepare_exception = transient_prepare;
store->commit_exception = transient_commit;
store->prepare_exception = transient_prepare_exception;
store->commit_exception = transient_commit_exception;
store->drop_snapshot = NULL;
store->fraction_full = transient_fraction_full;