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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/nfsctl.c
downloadlinux-linaro-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/nfsctl.c')
-rw-r--r--fs/nfsctl.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/fs/nfsctl.c b/fs/nfsctl.c
new file mode 100644
index 00000000000..0b14938b5b6
--- /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;
+}