diff options
Diffstat (limited to 'drivers/md/persistent-data/dm-transaction-manager.c')
| -rw-r--r-- | drivers/md/persistent-data/dm-transaction-manager.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/md/persistent-data/dm-transaction-manager.c b/drivers/md/persistent-data/dm-transaction-manager.c index b4f05830af07..d247a35da3c6 100644 --- a/drivers/md/persistent-data/dm-transaction-manager.c +++ b/drivers/md/persistent-data/dm-transaction-manager.c @@ -219,13 +219,24 @@ static int __shadow_block(struct dm_transaction_manager *tm, dm_block_t orig, if (r < 0) return r; - r = dm_bm_unlock_move(orig_block, new); - if (r < 0) { + /* + * It would be tempting to use dm_bm_unlock_move here, but some + * code, such as the space maps, keeps using the old data structures + * secure in the knowledge they won't be changed until the next + * transaction. Using unlock_move would force a synchronous read + * since the old block would no longer be in the cache. + */ + r = dm_bm_write_lock_zero(tm->bm, new, v, result); + if (r) { dm_bm_unlock(orig_block); return r; } - return dm_bm_write_lock(tm->bm, new, v, result); + memcpy(dm_block_data(*result), dm_block_data(orig_block), + dm_bm_block_size(tm->bm)); + + dm_bm_unlock(orig_block); + return r; } int dm_tm_shadow_block(struct dm_transaction_manager *tm, dm_block_t orig, |