diff options
Diffstat (limited to 'drivers/md/persistent-data/dm-block-manager.h')
| -rw-r--r-- | drivers/md/persistent-data/dm-block-manager.h | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/md/persistent-data/dm-block-manager.h b/drivers/md/persistent-data/dm-block-manager.h index 924833d2dfa6..be5bff61be28 100644 --- a/drivers/md/persistent-data/dm-block-manager.h +++ b/drivers/md/persistent-data/dm-block-manager.h @@ -97,14 +97,6 @@ int dm_bm_write_lock_zero(struct dm_block_manager *bm, dm_block_t b, int dm_bm_unlock(struct dm_block *b); /* - * An optimisation; we often want to copy a block's contents to a new - * block. eg, as part of the shadowing operation. It's far better for - * bufio to do this move behind the scenes than hold 2 locks and memcpy the - * data. - */ -int dm_bm_unlock_move(struct dm_block *b, dm_block_t n); - -/* * It's a common idiom to have a superblock that should be committed last. * * @superblock should be write-locked on entry. It will be unlocked during @@ -116,6 +108,19 @@ int dm_bm_unlock_move(struct dm_block *b, dm_block_t n); int dm_bm_flush_and_unlock(struct dm_block_manager *bm, struct dm_block *superblock); +/* + * Switches the bm to a read only mode. Once read-only mode + * has been entered the following functions will return -EPERM. + * + * dm_bm_write_lock + * dm_bm_write_lock_zero + * dm_bm_flush_and_unlock + * + * Additionally you should not use dm_bm_unlock_move, however no error will + * be returned if you do. + */ +void dm_bm_set_read_only(struct dm_block_manager *bm); + u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor); /*----------------------------------------------------------------*/ |