@@ -52,42 +52,6 @@ noinline void btrfs_set_path_blocking(struct btrfs_path *p)
}
}
-/*
- * reset all the locked nodes in the patch to spinning locks.
- *
- * held is used to keep lockdep happy, when lockdep is enabled
- * we set held to a blocking lock before we go around and
- * retake all the spinlocks in the path. You can safely use NULL
- * for held
- */
-noinline void btrfs_clear_path_blocking(struct btrfs_path *p,
- struct extent_buffer *held, int held_rw)
-{
- int i;
-
- if (held) {
- btrfs_set_lock_blocking_rw(held, held_rw);
- if (held_rw == BTRFS_WRITE_LOCK)
- held_rw = BTRFS_WRITE_LOCK_BLOCKING;
- else if (held_rw == BTRFS_READ_LOCK)
- held_rw = BTRFS_READ_LOCK_BLOCKING;
- }
- btrfs_set_path_blocking(p);
-
- for (i = BTRFS_MAX_LEVEL - 1; i >= 0; i--) {
- if (p->nodes[i] && p->locks[i]) {
- btrfs_clear_lock_blocking_rw(p->nodes[i], p->locks[i]);
- if (p->locks[i] == BTRFS_WRITE_LOCK_BLOCKING)
- p->locks[i] = BTRFS_WRITE_LOCK;
- else if (p->locks[i] == BTRFS_READ_LOCK_BLOCKING)
- p->locks[i] = BTRFS_READ_LOCK;
- }
- }
-
- if (held)
- btrfs_clear_lock_blocking_rw(held, held_rw);
-}
-
/* this also releases the path */
void btrfs_free_path(struct btrfs_path *p)
{
@@ -1306,7 +1270,6 @@ static struct tree_mod_elem *__tree_mod_log_oldest_root(
}
}
- btrfs_clear_path_blocking(path, NULL, BTRFS_READ_LOCK);
btrfs_tree_read_unlock_blocking(eb);
free_extent_buffer(eb);
@@ -2483,7 +2446,6 @@ noinline void btrfs_unlock_up_safe(struct btrfs_path *path, int level)
btrfs_set_path_blocking(p);
reada_for_balance(fs_info, p, level);
sret = split_node(trans, root, p, level);
- btrfs_clear_path_blocking(p, NULL, 0);
BUG_ON(sret > 0);
if (sret) {
@@ -2504,7 +2466,6 @@ noinline void btrfs_unlock_up_safe(struct btrfs_path *path, int level)
btrfs_set_path_blocking(p);
reada_for_balance(fs_info, p, level);
sret = balance_level(trans, root, p, level);
- btrfs_clear_path_blocking(p, NULL, 0);
if (sret) {
ret = sret;
@@ -2789,7 +2750,10 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
}
cow_done:
p->nodes[level] = b;
- btrfs_clear_path_blocking(p, NULL, 0);
+ /*
+ * Leave path with blocking locks to avoid massive
+ * lock context switch, this is made on purpose.
+ */
/*
* we have a lock on b and as long as we aren't changing
@@ -2871,8 +2835,6 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (!err) {
btrfs_set_path_blocking(p);
btrfs_tree_lock(b);
- btrfs_clear_path_blocking(p, b,
- BTRFS_WRITE_LOCK);
}
p->locks[level] = BTRFS_WRITE_LOCK;
} else {
@@ -2880,8 +2842,6 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (!err) {
btrfs_set_path_blocking(p);
btrfs_tree_read_lock(b);
- btrfs_clear_path_blocking(p, b,
- BTRFS_READ_LOCK);
}
p->locks[level] = BTRFS_READ_LOCK;
}
@@ -2900,7 +2860,6 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
btrfs_set_path_blocking(p);
err = split_leaf(trans, root, key,
p, ins_len, ret == 0);
- btrfs_clear_path_blocking(p, NULL, 0);
BUG_ON(err > 0);
if (err) {
@@ -2967,7 +2926,6 @@ int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
while (b) {
level = btrfs_header_level(b);
p->nodes[level] = b;
- btrfs_clear_path_blocking(p, NULL, 0);
/*
* we have a lock on b and as long as we aren't changing
@@ -3013,8 +2971,6 @@ int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
if (!err) {
btrfs_set_path_blocking(p);
btrfs_tree_read_lock(b);
- btrfs_clear_path_blocking(p, b,
- BTRFS_READ_LOCK);
}
b = tree_mod_log_rewind(fs_info, p, b, time_seq);
if (!b) {
@@ -5198,7 +5154,6 @@ int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
path->locks[level - 1] = BTRFS_READ_LOCK;
path->nodes[level - 1] = cur;
unlock_up(path, level, 1, 0, NULL);
- btrfs_clear_path_blocking(path, NULL, 0);
}
out:
path->keep_locks = keep_locks;
@@ -5783,8 +5738,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
if (!ret) {
btrfs_set_path_blocking(path);
btrfs_tree_read_lock(next);
- btrfs_clear_path_blocking(path, next,
- BTRFS_READ_LOCK);
}
next_rw_lock = BTRFS_READ_LOCK;
}
@@ -5820,8 +5773,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
if (!ret) {
btrfs_set_path_blocking(path);
btrfs_tree_read_lock(next);
- btrfs_clear_path_blocking(path, next,
- BTRFS_READ_LOCK);
}
next_rw_lock = BTRFS_READ_LOCK;
}
@@ -2876,8 +2876,6 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
void btrfs_set_path_blocking(struct btrfs_path *p);
-void btrfs_clear_path_blocking(struct btrfs_path *p,
- struct extent_buffer *held, int held_rw);
void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
@@ -762,9 +762,6 @@ static int btrfs_batch_insert_items(struct btrfs_root *root,
i++;
}
- /* reset all the locked nodes in the patch to spinning locks. */
- btrfs_clear_path_blocking(path, NULL, 0);
-
/* insert the keys of the items */
setup_items_for_insert(root, path, keys, data_size,
total_data_size, total_size, nitems);