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>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index fa220dc..7226a50 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1575,6 +1575,11 @@
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 @@
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 @@
{
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 @@
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 @@
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 @@
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 @@
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) {
