Create a btrfs backing dev info

This allows intelligent versions of unplug and congestion functions

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index db60d85598ce..0fa7cf227f1a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -494,6 +494,7 @@ void btrfs_read_locked_inode(struct inode *inode)
         switch (inode->i_mode & S_IFMT) {
         case S_IFREG:
                 inode->i_mapping->a_ops = &btrfs_aops;
+                inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
                 inode->i_fop = &btrfs_file_operations;
                 inode->i_op = &btrfs_file_inode_operations;
@@ -508,6 +509,7 @@ void btrfs_read_locked_inode(struct inode *inode)
         case S_IFLNK:
                 inode->i_op = &btrfs_symlink_inode_operations;
                 inode->i_mapping->a_ops = &btrfs_symlink_aops;
+                inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                 break;
         default:
                 init_special_inode(inode, inode->i_mode, rdev);
@@ -1792,6 +1794,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
                 drop_inode = 1;
         else {
                 inode->i_mapping->a_ops = &btrfs_aops;
+                inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                 inode->i_fop = &btrfs_file_operations;
                 inode->i_op = &btrfs_file_inode_operations;
                 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2960,6 +2963,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                 drop_inode = 1;
         else {
                 inode->i_mapping->a_ops = &btrfs_aops;
+                inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                 inode->i_fop = &btrfs_file_operations;
                 inode->i_op = &btrfs_file_inode_operations;
                 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2999,6 +3003,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
 
         inode->i_op = &btrfs_symlink_inode_operations;
         inode->i_mapping->a_ops = &btrfs_symlink_aops;
+        inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
         inode->i_size = name_len - 1;
         err = btrfs_update_inode(trans, root, inode);
         if (err)