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dm exception store: move cow pointer

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Move COW device from snapshot to exception store.

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 19:55:33 +01:00
committed by Alasdair G Kergon
parent d021684951
commit 49beb2b87a
6 changed files with 30 additions and 23 deletions
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10
drivers/md/dm-snap-persistent.c
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@@ -189,7 +189,7 @@ static void do_metadata(struct work_struct *work)
static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
{
struct dm_io_region where = {
.bdev = ps->snap->cow->bdev,
.bdev = ps->snap->store->cow->bdev,
.sector = ps->snap->store->chunk_size * chunk,
.count = ps->snap->store->chunk_size,
};
@@ -253,7 +253,7 @@ static void zero_memory_area(struct pstore *ps)
static int zero_disk_area(struct pstore *ps, chunk_t area)
{
struct dm_io_region where = {
.bdev = ps->snap->cow->bdev,
.bdev = ps->snap->store->cow->bdev,
.sector = ps->snap->store->chunk_size * area_location(ps, area),
.count = ps->snap->store->chunk_size,
};
@@ -280,7 +280,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
*/
if (!ps->snap->store->chunk_size) {
ps->snap->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
bdev_hardsect_size(ps->snap->cow->bdev) >> 9);
bdev_hardsect_size(ps->snap->store->cow->bdev) >> 9);
ps->snap->store->chunk_mask = ps->snap->store->chunk_size - 1;
ps->snap->store->chunk_shift = ffs(ps->snap->store->chunk_size)
- 1;
@@ -476,7 +476,7 @@ static void persistent_fraction_full(struct dm_exception_store *store,
sector_t *numerator, sector_t *denominator)
{
*numerator = get_info(store)->next_free * store->chunk_size;
*denominator = get_dev_size(store->snap->cow->bdev);
*denominator = get_dev_size(store->cow->bdev);
}
static void persistent_dtr(struct dm_exception_store *store)
@@ -565,7 +565,7 @@ static int persistent_prepare_exception(struct dm_exception_store *store,
struct pstore *ps = get_info(store);
uint32_t stride;
chunk_t next_free;
sector_t size = get_dev_size(store->snap->cow->bdev);
sector_t size = get_dev_size(store->cow->bdev);
/* Is there enough room ? */
if (size < ((ps->next_free + 1) * store->chunk_size))