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-rw-r--r--fs/btrfs/ctree.c23
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);