btrfs: clear __GFP_FS flag in the space cache inode

the object id of the space cache inode's key is allocated from the relative
root, just like the regular file. So we can't identify space cache inode by
checking the object id of the inode's key, and we have to clear __GFP_FS flag
at the time we look up the space cache inode.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 0037427d8a9d..13575de85543 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -81,6 +81,8 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
                 return ERR_PTR(-ENOENT);
         }
 
+        inode->i_mapping->flags &= ~__GFP_FS;
+
         spin_lock(&block_group->lock);
         if (!root->fs_info->closing) {
                 block_group->inode = igrab(inode);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1ca3e68586cf..57a03f6eb224 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2535,8 +2535,6 @@ static void btrfs_read_locked_inode(struct inode *inode)
         BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
 
         alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
-        if (location.objectid == BTRFS_FREE_SPACE_OBJECTID)
-                inode->i_mapping->flags &= ~__GFP_FS;
 
         /*
          * try to precache a NULL acl entry for files that don't have