[PATCH v2 5/5] btrfs: locking: add lock assertions

David Sterba
2019-10-30T10:56:58Z

Add assertions to locking functions where the we expect the lock to be
held. This must also respect the nesting, so write lock checks 'write'
while read lock only if the lock is held.

Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/locking.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 571c4826c428..147bf5d41962 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -195,6 +195,7 @@ static void btrfs_assert_tree_write_locks_put(struct extent_buffer *eb) { }
*/
void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
{
+ lockdep_assert_held(&eb->lock);
trace_btrfs_set_lock_blocking_read(eb);
/*
* No lock is required. The lock owner may change if we have a read
@@ -219,6 +220,7 @@ void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
*/
void btrfs_set_lock_blocking_write(struct extent_buffer *eb)
{
+ lockdep_assert_held_write(&eb->lock);
trace_btrfs_set_lock_blocking_write(eb);
/*
* No lock is required. The lock owner may change if we have a read
@@ -358,6 +360,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
*/
void btrfs_tree_read_unlock(struct extent_buffer *eb)
{
+ lockdep_assert_held(&eb->lock);
trace_btrfs_tree_read_unlock(eb);
/*
* if we're nested, we have the write lock. No new locking
--
2.23.0