dm exception store: move cow pointer
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>
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 7a90fed..5c067ef 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -468,7 +468,8 @@
/*
* Allocate room for a suitable hash table.
*/
-static int init_hash_tables(struct dm_snapshot *s, chunk_t chunk_shift)
+static int init_hash_tables(struct dm_snapshot *s, chunk_t chunk_shift,
+ struct dm_dev *cow)
{
sector_t hash_size, cow_dev_size, origin_dev_size, max_buckets;
@@ -476,7 +477,7 @@
* Calculate based on the size of the original volume or
* the COW volume...
*/
- cow_dev_size = get_dev_size(s->cow->bdev);
+ cow_dev_size = get_dev_size(cow->bdev);
origin_dev_size = get_dev_size(s->origin->bdev);
max_buckets = calc_max_buckets();
@@ -516,7 +517,8 @@
static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg,
chunk_t *chunk_size, chunk_t *chunk_mask,
- chunk_t *chunk_shift, char **error)
+ chunk_t *chunk_shift, struct dm_dev *cow,
+ char **error)
{
unsigned long chunk_size_ulong;
char *value;
@@ -545,7 +547,7 @@
}
/* Validate the chunk size against the device block size */
- if (chunk_size_ulong % (bdev_hardsect_size(s->cow->bdev) >> 9)) {
+ if (chunk_size_ulong % (bdev_hardsect_size(cow->bdev) >> 9)) {
*error = "Chunk size is not a multiple of device blocksize";
return -EINVAL;
}
@@ -569,6 +571,7 @@
char *origin_path;
char *cow_path;
chunk_t chunk_size, chunk_mask, chunk_shift;
+ struct dm_dev *cow;
if (argc != 4) {
ti->error = "requires exactly 4 arguments";
@@ -601,7 +604,7 @@
}
r = dm_get_device(ti, cow_path, 0, 0,
- FMODE_READ | FMODE_WRITE, &s->cow);
+ FMODE_READ | FMODE_WRITE, &cow);
if (r) {
dm_put_device(ti, s->origin);
ti->error = "Cannot get COW device";
@@ -609,7 +612,7 @@
}
r = set_chunk_size(s, argv[3], &chunk_size, &chunk_mask, &chunk_shift,
- &ti->error);
+ cow, &ti->error);
if (r)
goto bad3;
@@ -620,14 +623,14 @@
spin_lock_init(&s->pe_lock);
/* Allocate hash table for COW data */
- if (init_hash_tables(s, chunk_shift)) {
+ if (init_hash_tables(s, chunk_shift, cow)) {
ti->error = "Unable to allocate hash table space";
r = -ENOMEM;
goto bad3;
}
r = dm_exception_store_create(argv[2], ti, chunk_size, chunk_mask,
- chunk_shift, &s->store);
+ chunk_shift, cow, &s->store);
if (r) {
ti->error = "Couldn't create exception store";
r = -EINVAL;
@@ -705,7 +708,7 @@
exit_exception_table(&s->complete, exception_cache);
bad3:
- dm_put_device(ti, s->cow);
+ dm_put_device(ti, cow);
dm_put_device(ti, s->origin);
bad2:
@@ -732,6 +735,7 @@
int i;
#endif
struct dm_snapshot *s = ti->private;
+ struct dm_dev *cow = s->store->cow;
flush_workqueue(ksnapd);
@@ -759,7 +763,7 @@
mempool_destroy(s->pending_pool);
dm_put_device(ti, s->origin);
- dm_put_device(ti, s->cow);
+ dm_put_device(ti, cow);
kfree(s);
}
@@ -961,7 +965,7 @@
src.sector = chunk_to_sector(s, pe->e.old_chunk);
src.count = min(s->store->chunk_size, dev_size - src.sector);
- dest.bdev = s->cow->bdev;
+ dest.bdev = s->store->cow->bdev;
dest.sector = chunk_to_sector(s, pe->e.new_chunk);
dest.count = src.count;
@@ -1022,7 +1026,7 @@
static void remap_exception(struct dm_snapshot *s, struct dm_snap_exception *e,
struct bio *bio, chunk_t chunk)
{
- bio->bi_bdev = s->cow->bdev;
+ bio->bi_bdev = s->store->cow->bdev;
bio->bi_sector = chunk_to_sector(s, dm_chunk_number(e->new_chunk) +
(chunk - e->old_chunk)) +
(bio->bi_sector & s->store->chunk_mask);
@@ -1168,7 +1172,7 @@
* make sense.
*/
snprintf(result, maxlen, "%s %s %s %llu",
- snap->origin->name, snap->cow->name,
+ snap->origin->name, snap->store->cow->name,
snap->store->type->name,
(unsigned long long)snap->store->chunk_size);
break;