[PATCH 02/11] btrfs: open code btrfs_dev_replace_clear_lock_blocking

[David Sterba]

There's a single caller and the function name does not say it's actually
taking the lock, so open coding makes it more explicit.

For now, btrfs_dev_replace_read_lock is used instead of read_lock so
it's paired with the unlocking wrapper in the same block.

Signed-off-by: David Sterba <dste...@suse.com>
---
 fs/btrfs/dev-replace.c | 12 ------------
 fs/btrfs/dev-replace.h |  2 --
 fs/btrfs/volumes.c     |  6 +++++-
 3 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 24529d2c723a..004e8d380a11 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -995,18 +995,6 @@ void btrfs_dev_replace_set_lock_blocking(
        read_unlock(&dev_replace->lock);
 }
 
-/* acquire read lock and dec blocking cnt */
-void btrfs_dev_replace_clear_lock_blocking(
-                                       struct btrfs_dev_replace *dev_replace)
-{
-       /* only set blocking for read lock */
-       ASSERT(atomic_read(&dev_replace->blocking_readers) > 0);
-       read_lock(&dev_replace->lock);
-       /* Barrier implied by atomic_dec_and_test */
-       if (atomic_dec_and_test(&dev_replace->blocking_readers))
-               cond_wake_up_nomb(&dev_replace->read_lock_wq);
-}
-
 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
 {
        percpu_counter_inc(&fs_info->bio_counter);
diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h
index b6d4206188bb..39f022c457ff 100644
--- a/fs/btrfs/dev-replace.h
+++ b/fs/btrfs/dev-replace.h
@@ -28,8 +28,6 @@ void btrfs_dev_replace_read_unlock(struct btrfs_dev_replace 
*dev_replace);
 void btrfs_dev_replace_write_lock(struct btrfs_dev_replace *dev_replace);
 void btrfs_dev_replace_write_unlock(struct btrfs_dev_replace *dev_replace);
 void btrfs_dev_replace_set_lock_blocking(struct btrfs_dev_replace 
*dev_replace);
-void btrfs_dev_replace_clear_lock_blocking(
-                                       struct btrfs_dev_replace *dev_replace);
 
 static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value)
 {
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ea9845a5e601..762a4499d00a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5904,7 +5904,11 @@ static int __btrfs_map_block(struct btrfs_fs_info 
*fs_info,
        }
 out:
        if (dev_replace_is_ongoing) {
-               btrfs_dev_replace_clear_lock_blocking(dev_replace);
+               ASSERT(atomic_read(&dev_replace->blocking_readers) > 0);
+               btrfs_dev_replace_read_lock(dev_replace);
+               /* Barrier implied by atomic_dec_and_test */
+               if (atomic_dec_and_test(&dev_replace->blocking_readers))
+                       cond_wake_up_nomb(&dev_replace->read_lock_wq);
                btrfs_dev_replace_read_unlock(dev_replace);
        }
        free_extent_map(em);
-- 
2.18.0