smbfs: add bdi backing to mount session

This ensures that dirty data gets flushed properly.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 1c4c8f089970..dfa1d67f8fca 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -479,6 +479,7 @@ smb_put_super(struct super_block *sb)
         if (server->conn_pid)
                 kill_pid(server->conn_pid, SIGTERM, 1);
 
+        bdi_destroy(&server->bdi);
         kfree(server->ops);
         smb_unload_nls(server);
         sb->s_fs_info = NULL;
@@ -525,6 +526,11 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
         if (!server)
                 goto out_no_server;
         sb->s_fs_info = server;
+        
+        if (bdi_setup_and_register(&server->bdi, "smbfs", BDI_CAP_MAP_COPY))
+                goto out_bdi;
+
+        sb->s_bdi = &server->bdi;
 
         server->super_block = sb;
         server->mnt = NULL;
@@ -624,6 +630,8 @@ out_no_smbiod:
 out_bad_option:
         kfree(mem);
 out_no_mem:
+        bdi_destroy(&server->bdi);
+out_bdi:
         if (!server->mnt)
                 printk(KERN_ERR "smb_fill_super: allocation failure\n");
         sb->s_fs_info = NULL;
diff --git a/include/linux/smb_fs_sb.h b/include/linux/smb_fs_sb.h
index 8a060a7040d8..bb947dd1fba9 100644
--- a/include/linux/smb_fs_sb.h
+++ b/include/linux/smb_fs_sb.h
@@ -10,6 +10,7 @@
 #define _SMB_FS_SB
 
 #include <linux/types.h>
+#include <linux/backing-dev.h>
 #include <linux/smb.h>
 
 /*
@@ -74,6 +75,8 @@ struct smb_sb_info {
         struct smb_ops *ops;
 
         struct super_block *super_block;
+
+        struct backing_dev_info bdi;
 };
 
 static inline int