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| author | David Sterba <dsterba@suse.com> | 2018-08-24 17:13:41 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-04-29 20:02:21 +0300 |
| commit | 58a2ddaedbf74b8a209426128c130cc9f0dbd11b (patch) | |
| tree | 963b3c5e936dfab65624b44d062ddc615ff201a3 /fs/btrfs/locking.c | |
| parent | afd495a8264fb25cef49834b5c3559b8aaa612ee (diff) | |
| download | linux-58a2ddaedbf74b8a209426128c130cc9f0dbd11b.tar.xz | |
btrfs: add assertion helpers for extent buffer read lock counters
The read_locks are a simple counter to track locking balance and used to
assert tree locks. Add helpers to make it conditionally work only in
DEBUG builds. Will be used in followup patches.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/locking.c')
| -rw-r--r-- | fs/btrfs/locking.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 47bcd288977d..d3bb19835ab4 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -12,8 +12,6 @@ #include "extent_io.h" #include "locking.h" -static void btrfs_assert_tree_read_locked(struct extent_buffer *eb); - #ifdef CONFIG_BTRFS_DEBUG static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { @@ -43,12 +41,30 @@ static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) atomic_dec(&eb->spinning_readers); } +static void btrfs_assert_tree_read_locks_get(struct extent_buffer *eb) +{ + atomic_inc(&eb->read_locks); +} + +static void btrfs_assert_tree_read_locks_put(struct extent_buffer *eb) +{ + atomic_dec(&eb->read_locks); +} + +static void btrfs_assert_tree_read_locked(struct extent_buffer *eb) +{ + BUG_ON(!atomic_read(&eb->read_locks)); +} + #else static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { } static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { } static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { } static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { } static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { } +static void btrfs_assert_tree_read_locked(struct extent_buffer *eb) { } +static void btrfs_assert_tree_read_locks_get(struct extent_buffer *eb) { } +static void btrfs_assert_tree_read_locks_put(struct extent_buffer *eb) { } #endif void btrfs_set_lock_blocking_read(struct extent_buffer *eb) @@ -309,8 +325,3 @@ void btrfs_assert_tree_locked(struct extent_buffer *eb) { BUG_ON(!atomic_read(&eb->write_locks)); } - -static void btrfs_assert_tree_read_locked(struct extent_buffer *eb) -{ - BUG_ON(!atomic_read(&eb->read_locks)); -} |