4 * This should eventually move to userland.
7 #include <linux/types.h>
8 #include <linux/file.h>
10 #include <linux/sunrpc/svc.h>
11 #include <linux/nfsd/nfsd.h>
12 #include <linux/nfsd/syscall.h>
13 #include <linux/cred.h>
14 #include <linux/sched.h>
15 #include <linux/linkage.h>
16 #include <linux/namei.h>
17 #include <linux/mount.h>
18 #include <linux/syscalls.h>
19 #include <asm/uaccess.h>
22 * open a file on nfsd fs
25 static struct file *do_open(char *name, int flags)
31 mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
33 return (struct file *)mnt;
35 error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);
36 mntput(mnt); /* drop do_kern_mount reference */
38 return ERR_PTR(error);
41 error = may_open(&nd.path, MAY_READ|MAY_WRITE,
42 FMODE_READ|FMODE_WRITE);
44 error = may_open(&nd.path, MAY_WRITE, FMODE_WRITE);
47 return dentry_open(nd.path.dentry, nd.path.mnt, flags,
51 return ERR_PTR(error);
55 char *name; int wsize; int rsize;
59 .wsize = sizeof(struct nfsctl_svc)
61 [NFSCTL_ADDCLIENT] = {
63 .wsize = sizeof(struct nfsctl_client)
65 [NFSCTL_DELCLIENT] = {
67 .wsize = sizeof(struct nfsctl_client)
71 .wsize = sizeof(struct nfsctl_export)
75 .wsize = sizeof(struct nfsctl_export)
79 .wsize = sizeof(struct nfsctl_fdparm),
84 .wsize = sizeof(struct nfsctl_fsparm),
85 .rsize = sizeof(struct knfsd_fh)
90 asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res)
93 void __user *p = &arg->u;
97 if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
100 if (version != NFSCTL_VERSION)
103 if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)
106 file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);
108 return PTR_ERR(file);
109 err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
110 if (err >= 0 && map[cmd].rsize)
111 err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);