diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/persistent-data/dm-space-map-metadata.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c index d87a30a243d..51ca9edef44 100644 --- a/drivers/md/persistent-data/dm-space-map-metadata.c +++ b/drivers/md/persistent-data/dm-space-map-metadata.c @@ -144,12 +144,6 @@ static void sm_metadata_destroy(struct dm_space_map *sm) kfree(smm); } -static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks) -{ - DMERR("doesn't support extend"); - return -EINVAL; -} - static int sm_metadata_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count) { struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm); @@ -382,6 +376,8 @@ static int sm_metadata_copy_root(struct dm_space_map *sm, void *where_le, size_t return 0; } +static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks); + static struct dm_space_map ops = { .destroy = sm_metadata_destroy, .extend = sm_metadata_extend, @@ -522,6 +518,36 @@ static struct dm_space_map bootstrap_ops = { /*----------------------------------------------------------------*/ +static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks) +{ + int r, i; + enum allocation_event ev; + struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm); + dm_block_t old_len = smm->ll.nr_blocks; + + /* + * Flick into a mode where all blocks get allocated in the new area. + */ + smm->begin = old_len; + memcpy(&smm->sm, &bootstrap_ops, sizeof(smm->sm)); + + /* + * Extend. + */ + r = sm_ll_extend(&smm->ll, extra_blocks); + + /* + * Switch back to normal behaviour. + */ + memcpy(&smm->sm, &ops, sizeof(smm->sm)); + for (i = old_len; !r && i < smm->begin; i++) + r = sm_ll_inc(&smm->ll, i, &ev); + + return r; +} + +/*----------------------------------------------------------------*/ + struct dm_space_map *dm_sm_metadata_init(void) { struct sm_metadata *smm; |