btrfs: scrub: inline helper scrub_setup_wr_ctx

The helper scrub_setup_wr_ctx is used only once and fits into
scrub_setup_ctx as it continues intialization, no need to keep it
separate.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/scrub.c

@@ -289,9 +289,6 @@ static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
 			       u64 *extent_physical,
 			       struct btrfs_device **extent_dev,
 			       int *extent_mirror_num);
-static int scrub_setup_wr_ctx(struct scrub_wr_ctx *wr_ctx,
-			      struct btrfs_device *dev,
-			      int is_dev_replace);
 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
 				    struct scrub_page *spage);
@@ -680,7 +677,6 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
 	struct scrub_ctx *sctx;
 	int		i;
 	struct btrfs_fs_info *fs_info = dev->fs_info;
-	int ret;
 
 	sctx = kzalloc(sizeof(*sctx), GFP_KERNEL);
 	if (!sctx)
@@ -722,12 +718,16 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
 	spin_lock_init(&sctx->stat_lock);
 	init_waitqueue_head(&sctx->list_wait);
 
-	ret = scrub_setup_wr_ctx(&sctx->wr_ctx,
-				 fs_info->dev_replace.tgtdev, is_dev_replace);
-	if (ret) {
-		scrub_free_ctx(sctx);
-		return ERR_PTR(ret);
+	WARN_ON(sctx->wr_ctx.wr_curr_bio != NULL);
+	mutex_init(&sctx->wr_ctx.wr_lock);
+	sctx->wr_ctx.wr_curr_bio = NULL;
+	if (is_dev_replace) {
+		WARN_ON(!dev->bdev);
+		sctx->wr_ctx.pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
+		sctx->wr_ctx.tgtdev = dev;
+		atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
 	}
+
 	return sctx;
 
 nomem:
@@ -4337,24 +4337,6 @@ static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
 	btrfs_put_bbio(bbio);
 }
 
-static int scrub_setup_wr_ctx(struct scrub_wr_ctx *wr_ctx,
-			      struct btrfs_device *dev,
-			      int is_dev_replace)
-{
-	WARN_ON(wr_ctx->wr_curr_bio != NULL);
-
-	mutex_init(&wr_ctx->wr_lock);
-	wr_ctx->wr_curr_bio = NULL;
-	if (!is_dev_replace)
-		return 0;
-
-	WARN_ON(!dev->bdev);
-	wr_ctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
-	wr_ctx->tgtdev = dev;
-	atomic_set(&wr_ctx->flush_all_writes, 0);
-	return 0;
-}
-
 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
 {
 	mutex_lock(&wr_ctx->wr_lock);