btrfs: trace: Introduce trace events for all btrfs tree locking events

Unlike btrfs_tree_lock() and btrfs_tree_read_lock(), the remaining
functions in locking.c will not sleep, thus doesn't make much sense to
record their execution time.

Those events are introduced mainly for user space tool to audit and
detect lock leakage or dead lock.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 67b77f1d113ed0f089f1c7e3bee94a6c2378c9f9..2f6c3c7851ede3638896253aab8edf77f703823e 100644 (file)
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -87,6 +87,7 @@ static void btrfs_assert_tree_write_locks_put(struct extent_buffer *eb) { }
 
 void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
 {
+       trace_btrfs_set_lock_blocking_read(eb);
        /*
         * No lock is required.  The lock owner may change if we have a read
         * lock, but it won't change to or away from us.  If we have the write
@@ -102,6 +103,7 @@ void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
 
 void btrfs_set_lock_blocking_write(struct extent_buffer *eb)
 {
+       trace_btrfs_set_lock_blocking_write(eb);
        /*
         * No lock is required.  The lock owner may change if we have a read
         * lock, but it won't change to or away from us.  If we have the write
@@ -119,6 +121,7 @@ void btrfs_set_lock_blocking_write(struct extent_buffer *eb)
 
 void btrfs_clear_lock_blocking_read(struct extent_buffer *eb)
 {
+       trace_btrfs_clear_lock_blocking_read(eb);
        /*
         * No lock is required.  The lock owner may change if we have a read
         * lock, but it won't change to or away from us.  If we have the write
@@ -136,6 +139,7 @@ void btrfs_clear_lock_blocking_read(struct extent_buffer *eb)
 
 void btrfs_clear_lock_blocking_write(struct extent_buffer *eb)
 {
+       trace_btrfs_clear_lock_blocking_write(eb);
        /*
         * no lock is required.  The lock owner may change if
         * we have a read lock, but it won't change to or away
@@ -209,6 +213,7 @@ int btrfs_tree_read_lock_atomic(struct extent_buffer *eb)
        }
        btrfs_assert_tree_read_locks_get(eb);
        btrfs_assert_spinning_readers_get(eb);
+       trace_btrfs_tree_read_lock_atomic(eb);
        return 1;
 }
 
@@ -230,6 +235,7 @@ int btrfs_try_tree_read_lock(struct extent_buffer *eb)
        }
        btrfs_assert_tree_read_locks_get(eb);
        btrfs_assert_spinning_readers_get(eb);
+       trace_btrfs_try_tree_read_lock(eb);
        return 1;
 }
 
@@ -252,6 +258,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
        btrfs_assert_tree_write_locks_get(eb);
        btrfs_assert_spinning_writers_get(eb);
        eb->lock_owner = current->pid;
+       trace_btrfs_try_tree_write_lock(eb);
        return 1;
 }
 
@@ -260,6 +267,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
  */
 void btrfs_tree_read_unlock(struct extent_buffer *eb)
 {
+       trace_btrfs_tree_read_unlock(eb);
        /*
         * if we're nested, we have the write lock.  No new locking
         * is needed as long as we are the lock owner.
@@ -281,6 +289,7 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb)
  */
 void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb)
 {
+       trace_btrfs_tree_read_unlock_blocking(eb);
        /*
         * if we're nested, we have the write lock.  No new locking
         * is needed as long as we are the lock owner.
@@ -336,6 +345,7 @@ void btrfs_tree_unlock(struct extent_buffer *eb)
        BUG_ON(blockers > 1);
 
        btrfs_assert_tree_locked(eb);
+       trace_btrfs_tree_unlock(eb);
        eb->lock_owner = 0;
        btrfs_assert_tree_write_locks_put(eb);
 

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index e27ed5afb95866a7a199d661f53fbc66ea2ae022..fe4d268028ee02508078b58dde0567a3e868d8d1 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -2049,6 +2049,48 @@ DEFINE_EVENT(btrfs_sleep_tree_lock, btrfs_tree_lock,
        TP_ARGS(eb, start_ns)
 );
 
+DECLARE_EVENT_CLASS(btrfs_locking_events,
+       TP_PROTO(const struct extent_buffer *eb),
+
+       TP_ARGS(eb),
+
+       TP_STRUCT__entry_btrfs(
+               __field(        u64,    block           )
+               __field(        u64,    generation      )
+               __field(        u64,    owner           )
+               __field(        int,    is_log_tree     )
+       ),
+
+       TP_fast_assign_btrfs(eb->fs_info,
+               __entry->block          = eb->start;
+               __entry->generation     = btrfs_header_generation(eb);
+               __entry->owner          = btrfs_header_owner(eb);
+               __entry->is_log_tree    = (eb->log_index >= 0);
+       ),
+
+       TP_printk_btrfs("block=%llu generation=%llu owner=%llu is_log_tree=%d",
+               __entry->block, __entry->generation,
+               __entry->owner, __entry->is_log_tree)
+);
+
+#define DEFINE_BTRFS_LOCK_EVENT(name)                          \
+DEFINE_EVENT(btrfs_locking_events, name,                       \
+               TP_PROTO(const struct extent_buffer *eb),       \
+                                                               \
+               TP_ARGS(eb)                                     \
+)
+
+DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_unlock);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_unlock);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_unlock_blocking);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_set_lock_blocking_read);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_set_lock_blocking_write);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_clear_lock_blocking_read);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_clear_lock_blocking_write);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_read_lock);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_write_lock);
+DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_lock_atomic);
+
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */