cifs: 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, 13 insertions, 0 deletions

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 4797787c6a44..246a167cb913 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -18,6 +18,8 @@
 #ifndef _CIFS_FS_SB_H
 #define _CIFS_FS_SB_H
 
+#include <linux/backing-dev.h>
+
 #define CIFS_MOUNT_NO_PERM      1 /* do not do client vfs_perm check */
 #define CIFS_MOUNT_SET_UID      2 /* set current's euid in create etc. */
 #define CIFS_MOUNT_SERVER_INUM  4 /* inode numbers from uniqueid from server  */
@@ -50,5 +52,6 @@ struct cifs_sb_info {
 #ifdef CONFIG_CIFS_DFS_UPCALL
         char   *mountdata; /* mount options received at mount time */
 #endif
+        struct backing_dev_info bdi;
 };
 #endif                          /* _CIFS_FS_SB_H */
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index ded66be6597c..ad235d604a0b 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -103,6 +103,12 @@ cifs_read_super(struct super_block *sb, void *data,
         if (cifs_sb == NULL)
                 return -ENOMEM;
 
+        rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
+        if (rc) {
+                kfree(cifs_sb);
+                return rc;
+        }
+
 #ifdef CONFIG_CIFS_DFS_UPCALL
         /* copy mount params to sb for use in submounts */
         /* BB: should we move this after the mount so we
@@ -115,6 +121,7 @@ cifs_read_super(struct super_block *sb, void *data,
                 int len = strlen(data);
                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
                 if (cifs_sb->mountdata == NULL) {
+                        bdi_destroy(&cifs_sb->bdi);
                         kfree(sb->s_fs_info);
                         sb->s_fs_info = NULL;
                         return -ENOMEM;
@@ -135,6 +142,7 @@ cifs_read_super(struct super_block *sb, void *data,
 
         sb->s_magic = CIFS_MAGIC_NUMBER;
         sb->s_op = &cifs_super_ops;
+        sb->s_bdi = &cifs_sb->bdi;
 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
             sb->s_blocksize =
                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
@@ -183,6 +191,7 @@ out_mount_failed:
                 }
 #endif
                 unload_nls(cifs_sb->local_nls);
+                bdi_destroy(&cifs_sb->bdi);
                 kfree(cifs_sb);
         }
         return rc;
@@ -214,6 +223,7 @@ cifs_put_super(struct super_block *sb)
 #endif
 
         unload_nls(cifs_sb->local_nls);
+        bdi_destroy(&cifs_sb->bdi);
         kfree(cifs_sb);
 
         unlock_kernel();