From b95be2d9fb2a6120958b777e13d2328f9770bc2d Mon Sep 17 00:00:00 2001 From: David Sterba Date: Wed, 4 Apr 2018 01:43:05 +0200 Subject: btrfs: split btrfs_set_lock_blocking_rw to read and write helpers There are many callers that hardcode the desired lock type so we can avoid the switch and call them directly. Split the current function to two but leave a helper that still takes the variable lock type to make current code compile. The call sites will be converted in followup patches. Reviewed-by: Johannes Thumshirn Signed-off-by: David Sterba --- fs/btrfs/locking.c | 50 ++++++++++++++++++++++++++------------------------ 1 file changed, 26 insertions(+), 24 deletions(-) (limited to 'fs/btrfs/locking.c') diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 1da768e5ef75..7201d000f61d 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -14,35 +14,37 @@ static void btrfs_assert_tree_read_locked(struct extent_buffer *eb); -/* - * if we currently have a spinning reader or writer lock - * (indicated by the rw flag) this will bump the count - * of blocking holders and drop the spinlock. - */ -void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw) +void btrfs_set_lock_blocking_read(struct extent_buffer *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 lock, we are the owner - * and it'll never change. + * 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 + * lock, we are the owner and it'll never change. */ if (eb->lock_nested && current->pid == eb->lock_owner) return; - if (rw == BTRFS_WRITE_LOCK) { - if (atomic_read(&eb->blocking_writers) == 0) { - WARN_ON(atomic_read(&eb->spinning_writers) != 1); - atomic_dec(&eb->spinning_writers); - btrfs_assert_tree_locked(eb); - atomic_inc(&eb->blocking_writers); - write_unlock(&eb->lock); - } - } else if (rw == BTRFS_READ_LOCK) { - btrfs_assert_tree_read_locked(eb); - atomic_inc(&eb->blocking_readers); - WARN_ON(atomic_read(&eb->spinning_readers) == 0); - atomic_dec(&eb->spinning_readers); - read_unlock(&eb->lock); + btrfs_assert_tree_read_locked(eb); + atomic_inc(&eb->blocking_readers); + WARN_ON(atomic_read(&eb->spinning_readers) == 0); + atomic_dec(&eb->spinning_readers); + read_unlock(&eb->lock); +} + +void btrfs_set_lock_blocking_write(struct extent_buffer *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 + * lock, we are the owner and it'll never change. + */ + if (eb->lock_nested && current->pid == eb->lock_owner) + return; + if (atomic_read(&eb->blocking_writers) == 0) { + WARN_ON(atomic_read(&eb->spinning_writers) != 1); + atomic_dec(&eb->spinning_writers); + btrfs_assert_tree_locked(eb); + atomic_inc(&eb->blocking_writers); + write_unlock(&eb->lock); } } -- cgit v1.2.3