[patch 3/6] mm: bdi: expose the BDI object in sysfs for NFS

[Miklos Szeredi]

From: Miklos Szeredi <[EMAIL PROTECTED]>

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

Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]>
CC: Peter Zijlstra <[EMAIL PROTECTED]>
CC: Trond Myklebust <[EMAIL PROTECTED]>
---

Index: linux/fs/nfs/super.c
===================================================================
--- linux.orig/fs/nfs/super.c   2008-01-29 10:26:47.000000000 +0100
+++ linux/fs/nfs/super.c        2008-01-29 12:12:38.000000000 +0100
@@ -1475,6 +1475,12 @@ static int nfs_compare_super(struct supe
        return nfs_compare_mount_options(sb, server, mntflags);
 }
 
+static int nfs_bdi_register(struct nfs_server *server)
+{
+       return bdi_register(&server->backing_dev_info, NULL, "nfs-%u:%u",
+                           MAJOR(server->s_dev), MINOR(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)
 {
@@ -1515,6 +1521,10 @@ static int nfs_get_sb(struct file_system
        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) {
@@ -1555,6 +1565,7 @@ static void nfs_kill_super(struct super_
 {
        struct nfs_server *server = NFS_SB(s);
 
+       bdi_unregister(&server->backing_dev_info);
        kill_anon_super(s);
        nfs_free_server(server);
 }
@@ -1599,6 +1610,10 @@ static int nfs_xdev_get_sb(struct file_s
        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) {
@@ -1889,6 +1904,10 @@ static int nfs4_get_sb(struct file_syste
        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) {
@@ -1974,6 +1993,10 @@ static int nfs4_xdev_get_sb(struct file_
        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) {
@@ -2053,6 +2076,10 @@ static int nfs4_referral_get_sb(struct f
        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) {

--
-
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