From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 3 Sep 2014 13:35:36 +0000 (+0800)
Subject: Btrfs: fix unprotected device->bytes_used update
X-Git-Tag: firefly_0821_release~176^2~2834^2~55
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=43530c46cc55cf5a381e788276a93c83cbc95e46;p=firefly-linux-kernel-4.4.55.git

Btrfs: fix unprotected device->bytes_used update

We should update device->bytes_used in the lock context of
chunk_mutex, or we would get wrong data.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 1524b3f44036..45e0b5d0f6dd 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4429,6 +4429,9 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	if (ret)
 		goto error_del_extent;
 
+	for (i = 0; i < map->num_stripes; i++)
+		map->stripes[i].dev->bytes_used += stripe_size;
+
 	free_extent_map(em);
 	check_raid56_incompat_flag(extent_root->fs_info, type);
 
@@ -4500,7 +4503,6 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 		device = map->stripes[i].dev;
 		dev_offset = map->stripes[i].physical;
 
-		device->bytes_used += stripe_size;
 		ret = btrfs_update_device(trans, device);
 		if (ret)
 			goto out;