mm: bdi: expose the BDI object in sysfs for NFS

Register NFS' backing_dev_info under sysfs with the name "nfs-MAJOR:MINOR"

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index fa220dc74609..7226a506f3ca 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1575,6 +1575,11 @@ static int nfs_compare_super(struct super_block *sb, void *data)
         return nfs_compare_mount_options(sb, server, mntflags);
 }
 
+static int nfs_bdi_register(struct nfs_server *server)
+{
+        return bdi_register_dev(&server->backing_dev_info, server->s_dev);
+}
+
 static int nfs_get_sb(struct file_system_type *fs_type,
         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
 {
@@ -1617,6 +1622,10 @@ static int nfs_get_sb(struct file_system_type *fs_type,
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;
+        } else {
+                error = nfs_bdi_register(server);
+                if (error)
+                        goto error_splat_super;
         }
 
         if (!s->s_root) {
@@ -1664,6 +1673,7 @@ static void nfs_kill_super(struct super_block *s)
 {
         struct nfs_server *server = NFS_SB(s);
 
+        bdi_unregister(&server->backing_dev_info);
         kill_anon_super(s);
         nfs_free_server(server);
 }
@@ -1708,6 +1718,10 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;
+        } else {
+                error = nfs_bdi_register(server);
+                if (error)
+                        goto error_splat_super;
         }
 
         if (!s->s_root) {
@@ -1984,6 +1998,10 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;
+        } else {
+                error = nfs_bdi_register(server);
+                if (error)
+                        goto error_splat_super;
         }
 
         if (!s->s_root) {
@@ -2070,6 +2088,10 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;
+        } else {
+                error = nfs_bdi_register(server);
+                if (error)
+                        goto error_splat_super;
         }
 
         if (!s->s_root) {
@@ -2149,6 +2171,10 @@ static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;
+        } else {
+                error = nfs_bdi_register(server);
+                if (error)
+                        goto error_splat_super;
         }
 
         if (!s->s_root) {