1 files changed, 118 insertions, 0 deletions

diff --git a/fs/nfsctl.c b/fs/nfsctl.c
new file mode 100644
index 000000000000..0b14938b5b62
--- /dev/null
+++ b/fs/nfsctl.c
@@ -0,0 +1,118 @@
+/*
+ *      fs/nfsctl.c
+ *
+ *      This should eventually move to userland.
+ *
+ */
+#include <linux/config.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/syscall.h>
+#include <linux/linkage.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/syscalls.h>
+#include <asm/uaccess.h>
+
+/*
+ * open a file on nfsd fs
+ */
+
+static struct file *do_open(char *name, int flags)
+{
+        struct nameidata nd;
+        int error;
+
+        nd.mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
+
+        if (IS_ERR(nd.mnt))
+                return (struct file *)nd.mnt;
+
+        nd.dentry = dget(nd.mnt->mnt_root);
+        nd.last_type = LAST_ROOT;
+        nd.flags = 0;
+        nd.depth = 0;
+
+        error = path_walk(name, &nd);
+        if (error)
+                return ERR_PTR(error);
+
+        if (flags == O_RDWR)
+                error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE);
+        else
+                error = may_open(&nd, MAY_WRITE, FMODE_WRITE);
+
+        if (!error)
+                return dentry_open(nd.dentry, nd.mnt, flags);
+
+        path_release(&nd);
+        return ERR_PTR(error);
+}
+
+static struct {
+        char *name; int wsize; int rsize;
+} map[] = {
+        [NFSCTL_SVC] = {
+                .name   = ".svc",
+                .wsize  = sizeof(struct nfsctl_svc)
+        },
+        [NFSCTL_ADDCLIENT] = {
+                .name   = ".add",
+                .wsize  = sizeof(struct nfsctl_client)
+        },
+        [NFSCTL_DELCLIENT] = {
+                .name   = ".del",
+                .wsize  = sizeof(struct nfsctl_client)
+        },
+        [NFSCTL_EXPORT] = {
+                .name   = ".export",
+                .wsize  = sizeof(struct nfsctl_export)
+        },
+        [NFSCTL_UNEXPORT] = {
+                .name   = ".unexport",
+                .wsize  = sizeof(struct nfsctl_export)
+        },
+        [NFSCTL_GETFD] = {
+                .name   = ".getfd",
+                .wsize  = sizeof(struct nfsctl_fdparm),
+                .rsize  = NFS_FHSIZE
+        },
+        [NFSCTL_GETFS] = {
+                .name   = ".getfs",
+                .wsize  = sizeof(struct nfsctl_fsparm),
+                .rsize  = sizeof(struct knfsd_fh)
+        },
+};
+
+long
+asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res)
+{
+        struct file *file;
+        void __user *p = &arg->u;
+        int version;
+        int err;
+
+        if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
+                return -EFAULT;
+
+        if (version != NFSCTL_VERSION) {
+                printk(KERN_WARNING "nfsd: incompatible version in syscall.\n");
+                return -EINVAL;
+        }
+
+        if (cmd < 0 || cmd >= sizeof(map)/sizeof(map[0]) || !map[cmd].name)
+                return -EINVAL;
+
+        file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);      
+        if (IS_ERR(file))
+                return PTR_ERR(file);
+        err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
+        if (err >= 0 && map[cmd].rsize)
+                err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);
+        if (err >= 0)
+                err = 0;
+        fput(file);
+        return err;
+}