diff options
Diffstat (limited to 'fs/btrfs/locking.c')
| -rw-r--r-- | fs/btrfs/locking.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 6df03ba36026..67b77f1d113e 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -158,6 +158,10 @@ void btrfs_clear_lock_blocking_write(struct extent_buffer *eb) */ void btrfs_tree_read_lock(struct extent_buffer *eb) { + u64 start_ns = 0; + + if (trace_btrfs_tree_read_lock_enabled()) + start_ns = ktime_get_ns(); again: BUG_ON(!atomic_read(&eb->blocking_writers) && current->pid == eb->lock_owner); @@ -174,6 +178,7 @@ again: BUG_ON(eb->lock_nested); eb->lock_nested = true; read_unlock(&eb->lock); + trace_btrfs_tree_read_lock(eb, start_ns); return; } if (atomic_read(&eb->blocking_writers)) { @@ -184,6 +189,7 @@ again: } btrfs_assert_tree_read_locks_get(eb); btrfs_assert_spinning_readers_get(eb); + trace_btrfs_tree_read_lock(eb, start_ns); } /* @@ -299,6 +305,11 @@ void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb) */ void btrfs_tree_lock(struct extent_buffer *eb) { + u64 start_ns = 0; + + if (trace_btrfs_tree_lock_enabled()) + start_ns = ktime_get_ns(); + WARN_ON(eb->lock_owner == current->pid); again: wait_event(eb->read_lock_wq, atomic_read(&eb->blocking_readers) == 0); @@ -312,6 +323,7 @@ again: btrfs_assert_spinning_writers_get(eb); btrfs_assert_tree_write_locks_get(eb); eb->lock_owner = current->pid; + trace_btrfs_tree_lock(eb, start_ns); } /* |