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>
This commit is contained in:
Jonathan Brassow
Alasdair G Kergon
Родитель
d021684951
Коммит
49beb2b87a
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@ -139,7 +139,7 @@ EXPORT_SYMBOL(dm_exception_store_type_unregister);
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int dm_exception_store_create(const char *type_name, struct dm_target *ti,
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chunk_t chunk_size, chunk_t chunk_mask,
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chunk_t chunk_shift,
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chunk_t chunk_shift, struct dm_dev *cow,
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struct dm_exception_store **store)
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{
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int r = 0;
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@ -163,6 +163,8 @@ int dm_exception_store_create(const char *type_name, struct dm_target *ti,
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tmp_store->chunk_mask = chunk_mask;
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tmp_store->chunk_shift = chunk_shift;
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tmp_store->cow = cow;
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r = type->ctr(tmp_store, 0, NULL);
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if (r) {
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put_type(type);
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@ -99,6 +99,8 @@ struct dm_exception_store {
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struct dm_snapshot *snap;
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struct dm_dev *cow;
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/* Size of data blocks saved - must be a power of 2 */
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chunk_t chunk_size;
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chunk_t chunk_mask;
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@ -155,7 +157,7 @@ int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
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int dm_exception_store_create(const char *type_name, struct dm_target *ti,
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chunk_t chunk_size, chunk_t chunk_mask,
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chunk_t chunk_shift,
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chunk_t chunk_shift, struct dm_dev *cow,
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struct dm_exception_store **store);
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void dm_exception_store_destroy(struct dm_exception_store *store);
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@ -189,7 +189,7 @@ static void do_metadata(struct work_struct *work)
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static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
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{
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struct dm_io_region where = {
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.bdev = ps->snap->cow->bdev,
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.bdev = ps->snap->store->cow->bdev,
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.sector = ps->snap->store->chunk_size * chunk,
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.count = ps->snap->store->chunk_size,
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};
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@ -253,7 +253,7 @@ static void zero_memory_area(struct pstore *ps)
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static int zero_disk_area(struct pstore *ps, chunk_t area)
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{
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struct dm_io_region where = {
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.bdev = ps->snap->cow->bdev,
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.bdev = ps->snap->store->cow->bdev,
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.sector = ps->snap->store->chunk_size * area_location(ps, area),
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.count = ps->snap->store->chunk_size,
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};
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@ -280,7 +280,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
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*/
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if (!ps->snap->store->chunk_size) {
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ps->snap->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
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bdev_hardsect_size(ps->snap->cow->bdev) >> 9);
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bdev_hardsect_size(ps->snap->store->cow->bdev) >> 9);
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ps->snap->store->chunk_mask = ps->snap->store->chunk_size - 1;
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ps->snap->store->chunk_shift = ffs(ps->snap->store->chunk_size)
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- 1;
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@ -476,7 +476,7 @@ static void persistent_fraction_full(struct dm_exception_store *store,
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sector_t *numerator, sector_t *denominator)
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{
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*numerator = get_info(store)->next_free * store->chunk_size;
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*denominator = get_dev_size(store->snap->cow->bdev);
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*denominator = get_dev_size(store->cow->bdev);
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}
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static void persistent_dtr(struct dm_exception_store *store)
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@ -565,7 +565,7 @@ static int persistent_prepare_exception(struct dm_exception_store *store,
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struct pstore *ps = get_info(store);
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uint32_t stride;
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chunk_t next_free;
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sector_t size = get_dev_size(store->snap->cow->bdev);
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sector_t size = get_dev_size(store->cow->bdev);
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/* Is there enough room ? */
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if (size < ((ps->next_free + 1) * store->chunk_size))
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@ -40,7 +40,7 @@ static int transient_prepare_exception(struct dm_exception_store *store,
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struct dm_snap_exception *e)
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{
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struct transient_c *tc = store->context;
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sector_t size = get_dev_size(store->snap->cow->bdev);
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sector_t size = get_dev_size(store->cow->bdev);
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if (size < (tc->next_free + store->chunk_size))
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return -1;
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@ -64,7 +64,7 @@ static void transient_fraction_full(struct dm_exception_store *store,
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sector_t *numerator, sector_t *denominator)
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{
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*numerator = ((struct transient_c *) store->context)->next_free;
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*denominator = get_dev_size(store->snap->cow->bdev);
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*denominator = get_dev_size(store->cow->bdev);
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}
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static int transient_ctr(struct dm_exception_store *store,
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@ -468,7 +468,8 @@ static int calc_max_buckets(void)
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/*
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* Allocate room for a suitable hash table.
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*/
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static int init_hash_tables(struct dm_snapshot *s, chunk_t chunk_shift)
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static int init_hash_tables(struct dm_snapshot *s, chunk_t chunk_shift,
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struct dm_dev *cow)
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{
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sector_t hash_size, cow_dev_size, origin_dev_size, max_buckets;
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@ -476,7 +477,7 @@ static int init_hash_tables(struct dm_snapshot *s, chunk_t chunk_shift)
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* Calculate based on the size of the original volume or
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* the COW volume...
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*/
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cow_dev_size = get_dev_size(s->cow->bdev);
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cow_dev_size = get_dev_size(cow->bdev);
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origin_dev_size = get_dev_size(s->origin->bdev);
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max_buckets = calc_max_buckets();
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@ -516,7 +517,8 @@ static ulong round_up(ulong n, ulong size)
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static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg,
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chunk_t *chunk_size, chunk_t *chunk_mask,
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chunk_t *chunk_shift, char **error)
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chunk_t *chunk_shift, struct dm_dev *cow,
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char **error)
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{
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unsigned long chunk_size_ulong;
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char *value;
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@ -545,7 +547,7 @@ static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg,
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}
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/* Validate the chunk size against the device block size */
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if (chunk_size_ulong % (bdev_hardsect_size(s->cow->bdev) >> 9)) {
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if (chunk_size_ulong % (bdev_hardsect_size(cow->bdev) >> 9)) {
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*error = "Chunk size is not a multiple of device blocksize";
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return -EINVAL;
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}
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@ -569,6 +571,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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char *origin_path;
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char *cow_path;
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chunk_t chunk_size, chunk_mask, chunk_shift;
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struct dm_dev *cow;
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if (argc != 4) {
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ti->error = "requires exactly 4 arguments";
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@ -601,7 +604,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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}
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r = dm_get_device(ti, cow_path, 0, 0,
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FMODE_READ | FMODE_WRITE, &s->cow);
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FMODE_READ | FMODE_WRITE, &cow);
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if (r) {
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dm_put_device(ti, s->origin);
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ti->error = "Cannot get COW device";
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@ -609,7 +612,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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}
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r = set_chunk_size(s, argv[3], &chunk_size, &chunk_mask, &chunk_shift,
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&ti->error);
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cow, &ti->error);
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if (r)
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goto bad3;
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@ -620,14 +623,14 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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spin_lock_init(&s->pe_lock);
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/* Allocate hash table for COW data */
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if (init_hash_tables(s, chunk_shift)) {
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if (init_hash_tables(s, chunk_shift, cow)) {
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ti->error = "Unable to allocate hash table space";
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r = -ENOMEM;
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goto bad3;
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}
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r = dm_exception_store_create(argv[2], ti, chunk_size, chunk_mask,
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chunk_shift, &s->store);
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chunk_shift, cow, &s->store);
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if (r) {
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ti->error = "Couldn't create exception store";
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r = -EINVAL;
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@ -705,7 +708,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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exit_exception_table(&s->complete, exception_cache);
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bad3:
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dm_put_device(ti, s->cow);
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dm_put_device(ti, cow);
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dm_put_device(ti, s->origin);
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bad2:
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@ -732,6 +735,7 @@ static void snapshot_dtr(struct dm_target *ti)
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int i;
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#endif
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struct dm_snapshot *s = ti->private;
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struct dm_dev *cow = s->store->cow;
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flush_workqueue(ksnapd);
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@ -759,7 +763,7 @@ static void snapshot_dtr(struct dm_target *ti)
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mempool_destroy(s->pending_pool);
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dm_put_device(ti, s->origin);
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dm_put_device(ti, s->cow);
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dm_put_device(ti, cow);
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kfree(s);
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}
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@ -961,7 +965,7 @@ static void start_copy(struct dm_snap_pending_exception *pe)
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src.sector = chunk_to_sector(s, pe->e.old_chunk);
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src.count = min(s->store->chunk_size, dev_size - src.sector);
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dest.bdev = s->cow->bdev;
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dest.bdev = s->store->cow->bdev;
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dest.sector = chunk_to_sector(s, pe->e.new_chunk);
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dest.count = src.count;
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@ -1022,7 +1026,7 @@ __find_pending_exception(struct dm_snapshot *s,
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static void remap_exception(struct dm_snapshot *s, struct dm_snap_exception *e,
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struct bio *bio, chunk_t chunk)
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{
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bio->bi_bdev = s->cow->bdev;
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bio->bi_bdev = s->store->cow->bdev;
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bio->bi_sector = chunk_to_sector(s, dm_chunk_number(e->new_chunk) +
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(chunk - e->old_chunk)) +
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(bio->bi_sector & s->store->chunk_mask);
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@ -1168,7 +1172,7 @@ static int snapshot_status(struct dm_target *ti, status_type_t type,
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* make sense.
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*/
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snprintf(result, maxlen, "%s %s %s %llu",
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snap->origin->name, snap->cow->name,
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snap->origin->name, snap->store->cow->name,
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snap->store->type->name,
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(unsigned long long)snap->store->chunk_size);
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break;
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@ -27,7 +27,6 @@ struct dm_snapshot {
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struct rw_semaphore lock;
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struct dm_dev *origin;
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struct dm_dev *cow;
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/* List of snapshots per Origin */
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struct list_head list;
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