btrfs: Make reada_tree_block_flagged private

This function is used only for the readahead machinery. It makes no
sense to keep it external to reada.c file. Place it above its sole
caller and make it static. No functional changes.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 0b034c494355..ee6f60547a8d 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -639,6 +639,35 @@ static int reada_pick_zone(struct btrfs_device *dev)
 	return 1;
 }
 
+static int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
+				    int mirror_num, struct extent_buffer **eb)
+{
+	struct extent_buffer *buf = NULL;
+	int ret;
+
+	buf = btrfs_find_create_tree_block(fs_info, bytenr);
+	if (IS_ERR(buf))
+		return 0;
+
+	set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
+
+	ret = read_extent_buffer_pages(buf, WAIT_PAGE_LOCK, mirror_num);
+	if (ret) {
+		free_extent_buffer_stale(buf);
+		return ret;
+	}
+
+	if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
+		free_extent_buffer_stale(buf);
+		return -EIO;
+	} else if (extent_buffer_uptodate(buf)) {
+		*eb = buf;
+	} else {
+		free_extent_buffer(buf);
+	}
+	return 0;
+}
+
 static int reada_start_machine_dev(struct btrfs_device *dev)
 {
 	struct btrfs_fs_info *fs_info = dev->fs_info;