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Subject[patch 3/6] mm: bdi: expose the BDI object in sysfs for NFS
From: Miklos Szeredi <mszeredi@suse.cz>

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>
---

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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