#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
+#include <linux/mnt_namespace.h>
+#include <linux/namei.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
Opt_mountport,
Opt_mountvers,
Opt_nfsvers,
+ Opt_minorversion,
/* Mount options that take string arguments */
Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
{ Opt_mountvers, "mountvers=%s" },
{ Opt_nfsvers, "nfsvers=%s" },
{ Opt_nfsvers, "vers=%s" },
+ { Opt_minorversion, "minorversion=%s" },
{ Opt_sec, "sec=%s" },
{ Opt_proto, "proto=%s" },
#ifdef CONFIG_NFS_V4
static int nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
+static int nfs4_remote_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static int nfs4_referral_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
+static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static void nfs4_kill_super(struct super_block *sb);
static struct file_system_type nfs4_fs_type = {
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
+static struct file_system_type nfs4_remote_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .get_sb = nfs4_remote_get_sb,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
struct file_system_type nfs4_xdev_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
+static struct file_system_type nfs4_remote_referral_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .get_sb = nfs4_remote_referral_get_sb,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
struct file_system_type nfs4_referral_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
goto out_invalid_value;
}
break;
+ case Opt_minorversion:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ rc = strict_strtoul(string, 10, &option);
+ kfree(string);
+ if (rc != 0)
+ goto out_invalid_value;
+ if (option > NFS4_MAX_MINOR_VERSION)
+ goto out_invalid_value;
+ mnt->minorversion = option;
+ break;
/*
* options that take text values
args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
args->auth_flavors[0] = RPC_AUTH_UNIX;
args->auth_flavor_len = 0;
+ args->minorversion = 0;
switch (data->version) {
case 1:
}
/*
- * Get the superblock for an NFS4 mountpoint
+ * Get the superblock for the NFS4 root partition
*/
-static int nfs4_get_sb(struct file_system_type *fs_type,
+static int nfs4_remote_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
- struct nfs_parsed_mount_data *data;
+ struct nfs_parsed_mount_data *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct nfs_fh *mntfh;
};
int error = -ENOMEM;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
if (data == NULL || mntfh == NULL)
goto out_free_fh;
security_init_mnt_opts(&data->lsm_opts);
- /* Validate the mount data */
- error = nfs4_validate_mount_data(raw_data, data, dev_name);
- if (error < 0)
- goto out;
-
/* Get a volume representation */
server = nfs4_create_server(data, mntfh);
if (IS_ERR(server)) {
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
+ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_free;
error = 0;
out:
- kfree(data->client_address);
- kfree(data->nfs_server.export_path);
- kfree(data->nfs_server.hostname);
- kfree(data->fscache_uniq);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
- kfree(data);
return error;
out_free:
goto out;
}
+static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
+ int flags, void *data, const char *hostname)
+{
+ struct vfsmount *root_mnt;
+ char *root_devname;
+ size_t len;
+
+ len = strlen(hostname) + 3;
+ root_devname = kmalloc(len, GFP_KERNEL);
+ if (root_devname == NULL)
+ return ERR_PTR(-ENOMEM);
+ snprintf(root_devname, len, "%s:/", hostname);
+ root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
+ kfree(root_devname);
+ return root_mnt;
+}
+
+static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
+{
+ char *page = (char *) __get_free_page(GFP_KERNEL);
+ char *devname, *tmp;
+
+ if (page == NULL)
+ return;
+ devname = nfs_path(path->mnt->mnt_devname,
+ path->mnt->mnt_root, path->dentry,
+ page, PAGE_SIZE);
+ if (devname == NULL)
+ goto out_freepage;
+ tmp = kstrdup(devname, GFP_KERNEL);
+ if (tmp == NULL)
+ goto out_freepage;
+ kfree(mnt->mnt_devname);
+ mnt->mnt_devname = tmp;
+out_freepage:
+ free_page((unsigned long)page);
+}
+
+static int nfs_follow_remote_path(struct vfsmount *root_mnt,
+ const char *export_path, struct vfsmount *mnt_target)
+{
+ struct mnt_namespace *ns_private;
+ struct nameidata nd;
+ struct super_block *s;
+ int ret;
+
+ ns_private = create_mnt_ns(root_mnt);
+ ret = PTR_ERR(ns_private);
+ if (IS_ERR(ns_private))
+ goto out_mntput;
+
+ ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
+ export_path, LOOKUP_FOLLOW, &nd);
+
+ put_mnt_ns(ns_private);
+
+ if (ret != 0)
+ goto out_err;
+
+ s = nd.path.mnt->mnt_sb;
+ atomic_inc(&s->s_active);
+ mnt_target->mnt_sb = s;
+ mnt_target->mnt_root = dget(nd.path.dentry);
+
+ /* Correct the device pathname */
+ nfs_fix_devname(&nd.path, mnt_target);
+
+ path_put(&nd.path);
+ down_write(&s->s_umount);
+ return 0;
+out_mntput:
+ mntput(root_mnt);
+out_err:
+ return ret;
+}
+
+/*
+ * Get the superblock for an NFS4 mountpoint
+ */
+static int nfs4_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
+{
+ struct nfs_parsed_mount_data *data;
+ char *export_path;
+ struct vfsmount *root_mnt;
+ int error = -ENOMEM;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ goto out_free_data;
+
+ /* Validate the mount data */
+ error = nfs4_validate_mount_data(raw_data, data, dev_name);
+ if (error < 0)
+ goto out;
+
+ export_path = data->nfs_server.export_path;
+ data->nfs_server.export_path = "/";
+ root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
+ data->nfs_server.hostname);
+ data->nfs_server.export_path = export_path;
+
+ error = PTR_ERR(root_mnt);
+ if (IS_ERR(root_mnt))
+ goto out;
+
+ error = nfs_follow_remote_path(root_mnt, export_path, mnt);
+
+out:
+ kfree(data->client_address);
+ kfree(data->nfs_server.export_path);
+ kfree(data->nfs_server.hostname);
+ kfree(data->fscache_uniq);
+out_free_data:
+ kfree(data);
+ dprintk("<-- nfs4_get_sb() = %d%s\n", error,
+ error != 0 ? " [error]" : "");
+ return error;
+}
+
static void nfs4_kill_super(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
+ dprintk("--> %s\n", __func__);
nfs_super_return_all_delegations(sb);
kill_anon_super(sb);
-
nfs4_renewd_prepare_shutdown(server);
nfs_fscache_release_super_cookie(sb);
nfs_free_server(server);
+ dprintk("<-- %s\n", __func__);
}
/*
return error;
}
-/*
- * Create an NFS4 server record on referral traversal
- */
-static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data,
- struct vfsmount *mnt)
+static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data,
+ struct vfsmount *mnt)
{
struct nfs_clone_mount *data = raw_data;
struct super_block *s;
return error;
}
+/*
+ * Create an NFS4 server record on referral traversal
+ */
+static int nfs4_referral_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data,
+ struct vfsmount *mnt)
+{
+ struct nfs_clone_mount *data = raw_data;
+ char *export_path;
+ struct vfsmount *root_mnt;
+ int error;
+
+ dprintk("--> nfs4_referral_get_sb()\n");
+
+ export_path = data->mnt_path;
+ data->mnt_path = "/";
+
+ root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
+ flags, data, data->hostname);
+ data->mnt_path = export_path;
+
+ error = PTR_ERR(root_mnt);
+ if (IS_ERR(root_mnt))
+ goto out;
+
+ error = nfs_follow_remote_path(root_mnt, export_path, mnt);
+out:
+ dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
+ error != 0 ? " [error]" : "");
+ return error;
+}
+
#endif /* CONFIG_NFS_V4 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff