From: David Sterba <dsterba@suse.com>
Date: Fri, 24 Aug 2018 15:33:58 +0000 (+0200)
Subject: btrfs: open code btrfs_dev_replace_clear_lock_blocking
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7fb2eced105f67676eb86473d5b1ce6a96f6eab4;p=linux.git

btrfs: open code btrfs_dev_replace_clear_lock_blocking

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.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 702fe6a650752..a79e8d67f7681 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -998,18 +998,6 @@ 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 b6d4206188bb7..39f022c457fff 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 26eb388db3435..f435d397019ea 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);