diff options
| -rw-r--r-- | fs/btrfs/ctree.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 8af24da983b..270655da11d 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1395,7 +1395,8 @@ static noinline int reada_for_balance(struct btrfs_root *root, * if lowest_unlock is 1, level 0 won't be unlocked */ static noinline void unlock_up(struct btrfs_path *path, int level, - int lowest_unlock) + int lowest_unlock, int min_write_lock_level, + int *write_lock_level) { int i; int skip_level = level; @@ -1427,6 +1428,11 @@ static noinline void unlock_up(struct btrfs_path *path, int level, if (i >= lowest_unlock && i > skip_level && path->locks[i]) { btrfs_tree_unlock_rw(t, path->locks[i]); path->locks[i] = 0; + if (write_lock_level && + i > min_write_lock_level && + i <= *write_lock_level) { + *write_lock_level = i - 1; + } } } } @@ -1650,6 +1656,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root /* everything at write_lock_level or lower must be write locked */ int write_lock_level = 0; u8 lowest_level = 0; + int min_write_lock_level; lowest_level = p->lowest_level; WARN_ON(lowest_level && ins_len > 0); @@ -1677,6 +1684,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root if (cow && (p->keep_locks || p->lowest_level)) write_lock_level = BTRFS_MAX_LEVEL; + min_write_lock_level = write_lock_level; + again: /* * we try very hard to do read locks on the root @@ -1808,7 +1817,8 @@ cow_done: goto again; } - unlock_up(p, level, lowest_unlock); + unlock_up(p, level, lowest_unlock, + min_write_lock_level, &write_lock_level); if (level == lowest_level) { if (dec) @@ -1870,7 +1880,8 @@ cow_done: } } if (!p->search_for_split) - unlock_up(p, level, lowest_unlock); + unlock_up(p, level, lowest_unlock, + min_write_lock_level, &write_lock_level); goto done; } } @@ -4108,7 +4119,7 @@ find_next_key: path->slots[level] = slot; if (level == path->lowest_level) { ret = 0; - unlock_up(path, level, 1); + unlock_up(path, level, 1, 0, NULL); goto out; } btrfs_set_path_blocking(path); @@ -4119,7 +4130,7 @@ find_next_key: path->locks[level - 1] = BTRFS_READ_LOCK; path->nodes[level - 1] = cur; - unlock_up(path, level, 1); + unlock_up(path, level, 1, 0, NULL); btrfs_clear_path_blocking(path, NULL, 0); } out: @@ -4355,7 +4366,7 @@ again: } ret = 0; done: - unlock_up(path, 0, 1); + unlock_up(path, 0, 1, 0, NULL); path->leave_spinning = old_spinning; if (!old_spinning) btrfs_set_path_blocking(path); |