* linux/fs/nfs/nfs4namespace.c
*
* Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com>
+ * - Modified by David Howells <dhowells@redhat.com>
*
* NFSv4 namespace
*/
-#include <linux/config.h>
-
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/inet.h>
#include "internal.h"
+#include "nfs4_fs.h"
#define NFSDBG_FACILITY NFSDBG_VFS
return ERR_PTR(-ENAMETOOLONG);
}
+/*
+ * Determine the mount path as a string
+ */
+static char *nfs4_path(const struct vfsmount *mnt_parent,
+ const struct dentry *dentry,
+ char *buffer, ssize_t buflen)
+{
+ const char *srvpath;
+
+ srvpath = strchr(mnt_parent->mnt_devname, ':');
+ if (srvpath)
+ srvpath++;
+ else
+ srvpath = mnt_parent->mnt_devname;
+
+ return nfs_path(srvpath, mnt_parent->mnt_root, dentry, buffer, buflen);
+}
+
+/*
+ * Check that fs_locations::fs_root [RFC3530 6.3] is a prefix for what we
+ * believe to be the server path to this dentry
+ */
+static int nfs4_validate_fspath(const struct vfsmount *mnt_parent,
+ const struct dentry *dentry,
+ const struct nfs4_fs_locations *locations,
+ char *page, char *page2)
+{
+ const char *path, *fs_path;
+
+ path = nfs4_path(mnt_parent, dentry, page, PAGE_SIZE);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
+
+ fs_path = nfs4_pathname_string(&locations->fs_path, page2, PAGE_SIZE);
+ if (IS_ERR(fs_path))
+ return PTR_ERR(fs_path);
+
+ if (strncmp(path, fs_path, strlen(fs_path)) != 0) {
+ dprintk("%s: path %s does not begin with fsroot %s\n",
+ __func__, path, fs_path);
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
+ char *page, char *page2,
+ const struct nfs4_fs_location *location)
+{
+ struct vfsmount *mnt = ERR_PTR(-ENOENT);
+ char *mnt_path;
+ int page2len;
+ unsigned int s;
+
+ mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
+ if (IS_ERR(mnt_path))
+ return mnt;
+ mountdata->mnt_path = mnt_path;
+ page2 += strlen(mnt_path) + 1;
+ page2len = PAGE_SIZE - strlen(mnt_path) - 1;
+
+ for (s = 0; s < location->nservers; s++) {
+ const struct nfs4_string *buf = &location->servers[s];
+ struct sockaddr_storage addr;
+
+ if (buf->len <= 0 || buf->len >= PAGE_SIZE)
+ continue;
+
+ mountdata->addr = (struct sockaddr *)&addr;
+
+ if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len))
+ continue;
+ nfs_parse_ip_address(buf->data, buf->len,
+ mountdata->addr, &mountdata->addrlen);
+ if (mountdata->addr->sa_family == AF_UNSPEC)
+ continue;
+ nfs_set_port(mountdata->addr, NFS_PORT);
+
+ strncpy(page2, buf->data, page2len);
+ page2[page2len] = '\0';
+ mountdata->hostname = page2;
+
+ snprintf(page, PAGE_SIZE, "%s:%s",
+ mountdata->hostname,
+ mountdata->mnt_path);
+
+ mnt = vfs_kern_mount(&nfs4_referral_fs_type, 0, page, mountdata);
+ if (!IS_ERR(mnt))
+ break;
+ }
+ return mnt;
+}
/**
* nfs_follow_referral - set up mountpoint when hitting a referral on moved error
* @mnt_parent - mountpoint of parent directory
* @dentry - parent directory
- * @fspath - fs path returned in fs_locations
- * @mntpath - mount path to new server
- * @hostname - hostname of new server
- * @addr - host addr of new server
+ * @locations - array of NFSv4 server location information
*
*/
static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
.dentry = dentry,
.authflavor = NFS_SB(mnt_parent->mnt_sb)->client->cl_auth->au_flavor,
};
- char *page, *page2;
- char *path, *fs_path;
- char *devname;
- int loc, s;
+ char *page = NULL, *page2 = NULL;
+ int loc, error;
if (locations == NULL || locations->nlocations <= 0)
goto out;
- dprintk("%s: referral at %s/%s\n", __FUNCTION__,
+ dprintk("%s: referral at %s/%s\n", __func__,
dentry->d_parent->d_name.name, dentry->d_name.name);
- /* Ensure fs path is a prefix of current dentry path */
page = (char *) __get_free_page(GFP_USER);
- if (page == NULL)
+ if (!page)
goto out;
+
page2 = (char *) __get_free_page(GFP_USER);
- if (page2 == NULL)
+ if (!page2)
goto out;
- path = nfs4_path(dentry, page, PAGE_SIZE);
- if (IS_ERR(path))
- goto out_free;
-
- fs_path = nfs4_pathname_string(&locations->fs_path, page2, PAGE_SIZE);
- if (IS_ERR(fs_path))
- goto out_free;
-
- if (strncmp(path, fs_path, strlen(fs_path)) != 0) {
- dprintk("%s: path %s does not begin with fsroot %s\n", __FUNCTION__, path, fs_path);
- goto out_free;
- }
-
- devname = nfs_devname(mnt_parent, dentry, page, PAGE_SIZE);
- if (IS_ERR(devname)) {
- mnt = (struct vfsmount *)devname;
- goto out_free;
+ /* Ensure fs path is a prefix of current dentry path */
+ error = nfs4_validate_fspath(mnt_parent, dentry, locations, page, page2);
+ if (error < 0) {
+ mnt = ERR_PTR(error);
+ goto out;
}
- loc = 0;
- while (loc < locations->nlocations && IS_ERR(mnt)) {
+ for (loc = 0; loc < locations->nlocations; loc++) {
const struct nfs4_fs_location *location = &locations->locations[loc];
- char *mnt_path;
if (location == NULL || location->nservers <= 0 ||
- location->rootpath.ncomponents == 0) {
- loc++;
+ location->rootpath.ncomponents == 0)
continue;
- }
- mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
- if (IS_ERR(mnt_path)) {
- loc++;
- continue;
- }
- mountdata.mnt_path = mnt_path;
-
- s = 0;
- while (s < location->nservers) {
- struct sockaddr_in addr = {};
-
- if (location->servers[s].len <= 0 ||
- valid_ipaddr4(location->servers[s].data) < 0) {
- s++;
- continue;
- }
-
- mountdata.hostname = location->servers[s].data;
- addr.sin_addr.s_addr = in_aton(mountdata.hostname);
- addr.sin_family = AF_INET;
- addr.sin_port = htons(NFS_PORT);
- mountdata.addr = &addr;
-
- mnt = vfs_kern_mount(&nfs_referral_nfs4_fs_type, 0, devname, &mountdata);
- if (!IS_ERR(mnt)) {
- break;
- }
- s++;
- }
- loc++;
+ mnt = try_location(&mountdata, page, page2, location);
+ if (!IS_ERR(mnt))
+ break;
}
-out_free:
- free_page((unsigned long)page);
- free_page((unsigned long)page2);
out:
- dprintk("%s: done\n", __FUNCTION__);
+ free_page((unsigned long) page);
+ free_page((unsigned long) page2);
+ dprintk("%s: done\n", __func__);
return mnt;
}
*/
struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
{
- struct vfsmount *mnt = ERR_PTR(-ENOENT);
+ struct vfsmount *mnt = ERR_PTR(-ENOMEM);
struct dentry *parent;
struct nfs4_fs_locations *fs_locations = NULL;
struct page *page;
int err;
/* BUG_ON(IS_ROOT(dentry)); */
- dprintk("%s: enter\n", __FUNCTION__);
+ dprintk("%s: enter\n", __func__);
page = alloc_page(GFP_KERNEL);
if (page == NULL)
goto out_free;
/* Get locations */
+ mnt = ERR_PTR(-ENOENT);
+
parent = dget_parent(dentry);
- dprintk("%s: getting locations for %s/%s\n", __FUNCTION__, parent->d_name.name, dentry->d_name.name);
- err = nfs4_proc_fs_locations(parent->d_inode, dentry, fs_locations, page);
+ dprintk("%s: getting locations for %s/%s\n",
+ __func__, parent->d_name.name, dentry->d_name.name);
+
+ err = nfs4_proc_fs_locations(parent->d_inode, &dentry->d_name, fs_locations, page);
dput(parent);
- if (err != 0 || fs_locations->nlocations <= 0 ||
+ if (err != 0 ||
+ fs_locations->nlocations <= 0 ||
fs_locations->fs_path.ncomponents <= 0)
goto out_free;
__free_page(page);
kfree(fs_locations);
out:
- dprintk("%s: done\n", __FUNCTION__);
+ dprintk("%s: done\n", __func__);
return mnt;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff