super.c 63.7 KB
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/*
 *  linux/fs/nfs/super.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  nfs superblock handling functions
 *
 *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 *
 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 *  J.S.Peatfield@damtp.cam.ac.uk
 *
 *  Split from inode.c by David Howells <dhowells@redhat.com>
 *
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 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
 *   particular server are held in the same superblock
 * - NFS superblocks can have several effective roots to the dentry tree
 * - directory type roots are spliced into the tree when a path from one root reaches the root
 *   of another (see nfs_lookup())
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 */

#include <linux/module.h>
#include <linux/init.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/xprtrdma.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
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#include <linux/in6.h>
#include <net/ipv6.h>
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#include <linux/netdevice.h>
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#include <linux/nfs_xdr.h>
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#include <linux/magic.h>
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#include <linux/parser.h>
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#include <asm/system.h>
#include <asm/uaccess.h>

#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"

#define NFSDBG_FACILITY		NFSDBG_VFS

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enum {
	/* Mount options that take no arguments */
	Opt_soft, Opt_hard,
	Opt_posix, Opt_noposix,
	Opt_cto, Opt_nocto,
	Opt_ac, Opt_noac,
	Opt_lock, Opt_nolock,
	Opt_v2, Opt_v3,
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	Opt_udp, Opt_tcp, Opt_rdma,
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	Opt_acl, Opt_noacl,
	Opt_rdirplus, Opt_nordirplus,
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	Opt_sharecache, Opt_nosharecache,
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	/* Mount options that take integer arguments */
	Opt_port,
	Opt_rsize, Opt_wsize, Opt_bsize,
	Opt_timeo, Opt_retrans,
	Opt_acregmin, Opt_acregmax,
	Opt_acdirmin, Opt_acdirmax,
	Opt_actimeo,
	Opt_namelen,
	Opt_mountport,
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	Opt_mountvers,
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	Opt_nfsvers,
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	/* Mount options that take string arguments */
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	Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
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	Opt_addr, Opt_mountaddr, Opt_clientaddr,
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	Opt_lookupcache,
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	/* Special mount options */
	Opt_userspace, Opt_deprecated, Opt_sloppy,
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	Opt_err
};

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static const match_table_t nfs_mount_option_tokens = {
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	{ Opt_userspace, "bg" },
	{ Opt_userspace, "fg" },
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	{ Opt_userspace, "retry=%s" },

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	{ Opt_sloppy, "sloppy" },

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	{ Opt_soft, "soft" },
	{ Opt_hard, "hard" },
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	{ Opt_deprecated, "intr" },
	{ Opt_deprecated, "nointr" },
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	{ Opt_posix, "posix" },
	{ Opt_noposix, "noposix" },
	{ Opt_cto, "cto" },
	{ Opt_nocto, "nocto" },
	{ Opt_ac, "ac" },
	{ Opt_noac, "noac" },
	{ Opt_lock, "lock" },
	{ Opt_nolock, "nolock" },
	{ Opt_v2, "v2" },
	{ Opt_v3, "v3" },
	{ Opt_udp, "udp" },
	{ Opt_tcp, "tcp" },
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	{ Opt_rdma, "rdma" },
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	{ Opt_acl, "acl" },
	{ Opt_noacl, "noacl" },
	{ Opt_rdirplus, "rdirplus" },
	{ Opt_nordirplus, "nordirplus" },
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	{ Opt_sharecache, "sharecache" },
	{ Opt_nosharecache, "nosharecache" },
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	{ Opt_port, "port=%u" },
	{ Opt_rsize, "rsize=%u" },
	{ Opt_wsize, "wsize=%u" },
	{ Opt_bsize, "bsize=%u" },
	{ Opt_timeo, "timeo=%u" },
	{ Opt_retrans, "retrans=%u" },
	{ Opt_acregmin, "acregmin=%u" },
	{ Opt_acregmax, "acregmax=%u" },
	{ Opt_acdirmin, "acdirmin=%u" },
	{ Opt_acdirmax, "acdirmax=%u" },
	{ Opt_actimeo, "actimeo=%u" },
	{ Opt_namelen, "namlen=%u" },
	{ Opt_mountport, "mountport=%u" },
	{ Opt_mountvers, "mountvers=%u" },
	{ Opt_nfsvers, "nfsvers=%u" },
	{ Opt_nfsvers, "vers=%u" },

	{ Opt_sec, "sec=%s" },
	{ Opt_proto, "proto=%s" },
	{ Opt_mountproto, "mountproto=%s" },
	{ Opt_addr, "addr=%s" },
	{ Opt_clientaddr, "clientaddr=%s" },
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	{ Opt_mounthost, "mounthost=%s" },
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	{ Opt_mountaddr, "mountaddr=%s" },
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	{ Opt_lookupcache, "lookupcache=%s" },

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	{ Opt_err, NULL }
};

enum {
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	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
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	Opt_xprt_err
};

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static const match_table_t nfs_xprt_protocol_tokens = {
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	{ Opt_xprt_udp, "udp" },
	{ Opt_xprt_tcp, "tcp" },
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	{ Opt_xprt_rdma, "rdma" },
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	{ Opt_xprt_err, NULL }
};

enum {
	Opt_sec_none, Opt_sec_sys,
	Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
	Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
	Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,

	Opt_sec_err
};

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static const match_table_t nfs_secflavor_tokens = {
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	{ Opt_sec_none, "none" },
	{ Opt_sec_none, "null" },
	{ Opt_sec_sys, "sys" },

	{ Opt_sec_krb5, "krb5" },
	{ Opt_sec_krb5i, "krb5i" },
	{ Opt_sec_krb5p, "krb5p" },

	{ Opt_sec_lkey, "lkey" },
	{ Opt_sec_lkeyi, "lkeyi" },
	{ Opt_sec_lkeyp, "lkeyp" },

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	{ Opt_sec_spkm, "spkm3" },
	{ Opt_sec_spkmi, "spkm3i" },
	{ Opt_sec_spkmp, "spkm3p" },

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	{ Opt_sec_err, NULL }
};

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enum {
	Opt_lookupcache_all, Opt_lookupcache_positive,
	Opt_lookupcache_none,

	Opt_lookupcache_err
};

static match_table_t nfs_lookupcache_tokens = {
	{ Opt_lookupcache_all, "all" },
	{ Opt_lookupcache_positive, "pos" },
	{ Opt_lookupcache_positive, "positive" },
	{ Opt_lookupcache_none, "none" },

	{ Opt_lookupcache_err, NULL }
};

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static void nfs_umount_begin(struct super_block *);
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static int  nfs_statfs(struct dentry *, struct kstatfs *);
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static int  nfs_show_options(struct seq_file *, struct vfsmount *);
static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
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static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
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static int nfs_xdev_get_sb(struct file_system_type *fs_type,
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		int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static void nfs_kill_super(struct super_block *);
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static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
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static struct file_system_type nfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs",
	.get_sb		= nfs_get_sb,
	.kill_sb	= nfs_kill_super,
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	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};

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struct file_system_type nfs_xdev_fs_type = {
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	.owner		= THIS_MODULE,
	.name		= "nfs",
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	.get_sb		= nfs_xdev_get_sb,
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	.kill_sb	= nfs_kill_super,
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	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};

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static const struct super_operations nfs_sops = {
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	.alloc_inode	= nfs_alloc_inode,
	.destroy_inode	= nfs_destroy_inode,
	.write_inode	= nfs_write_inode,
	.statfs		= nfs_statfs,
	.clear_inode	= nfs_clear_inode,
	.umount_begin	= nfs_umount_begin,
	.show_options	= nfs_show_options,
	.show_stats	= nfs_show_stats,
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	.remount_fs	= nfs_remount,
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};

#ifdef CONFIG_NFS_V4
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static int nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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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);
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static void nfs4_kill_super(struct super_block *sb);

static struct file_system_type nfs4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs4",
	.get_sb		= nfs4_get_sb,
	.kill_sb	= nfs4_kill_super,
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	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};

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struct file_system_type nfs4_xdev_fs_type = {
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	.owner		= THIS_MODULE,
	.name		= "nfs4",
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	.get_sb		= nfs4_xdev_get_sb,
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	.kill_sb	= nfs4_kill_super,
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	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};

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struct file_system_type nfs4_referral_fs_type = {
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	.owner		= THIS_MODULE,
	.name		= "nfs4",
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	.get_sb		= nfs4_referral_get_sb,
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	.kill_sb	= nfs4_kill_super,
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	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};

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static const struct super_operations nfs4_sops = {
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	.alloc_inode	= nfs_alloc_inode,
	.destroy_inode	= nfs_destroy_inode,
	.write_inode	= nfs_write_inode,
	.statfs		= nfs_statfs,
	.clear_inode	= nfs4_clear_inode,
	.umount_begin	= nfs_umount_begin,
	.show_options	= nfs_show_options,
	.show_stats	= nfs_show_stats,
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	.remount_fs	= nfs_remount,
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};
#endif

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static struct shrinker acl_shrinker = {
	.shrink		= nfs_access_cache_shrinker,
	.seeks		= DEFAULT_SEEKS,
};
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/*
 * Register the NFS filesystems
 */
int __init register_nfs_fs(void)
{
	int ret;

        ret = register_filesystem(&nfs_fs_type);
	if (ret < 0)
		goto error_0;

	ret = nfs_register_sysctl();
	if (ret < 0)
		goto error_1;
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#ifdef CONFIG_NFS_V4
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	ret = register_filesystem(&nfs4_fs_type);
	if (ret < 0)
		goto error_2;
#endif
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	register_shrinker(&acl_shrinker);
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	return 0;

#ifdef CONFIG_NFS_V4
error_2:
	nfs_unregister_sysctl();
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#endif
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error_1:
	unregister_filesystem(&nfs_fs_type);
error_0:
	return ret;
}

/*
 * Unregister the NFS filesystems
 */
void __exit unregister_nfs_fs(void)
{
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	unregister_shrinker(&acl_shrinker);
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#ifdef CONFIG_NFS_V4
	unregister_filesystem(&nfs4_fs_type);
#endif
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	nfs_unregister_sysctl();
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	unregister_filesystem(&nfs_fs_type);
}

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void nfs_sb_active(struct super_block *sb)
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{
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	struct nfs_server *server = NFS_SB(sb);
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	if (atomic_inc_return(&server->active) == 1)
		atomic_inc(&sb->s_active);
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}

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void nfs_sb_deactive(struct super_block *sb)
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{
	struct nfs_server *server = NFS_SB(sb);
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	if (atomic_dec_and_test(&server->active))
		deactivate_super(sb);
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}

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/*
 * Deliver file system statistics to userspace
 */
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static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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	struct nfs_server *server = NFS_SB(dentry->d_sb);
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	unsigned char blockbits;
	unsigned long blockres;
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	struct nfs_fh *fh = NFS_FH(dentry->d_inode);
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	struct nfs_fattr fattr;
	struct nfs_fsstat res = {
			.fattr = &fattr,
	};
	int error;

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	error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
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	if (error < 0)
		goto out_err;
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	buf->f_type = NFS_SUPER_MAGIC;
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	/*
	 * Current versions of glibc do not correctly handle the
	 * case where f_frsize != f_bsize.  Eventually we want to
	 * report the value of wtmult in this field.
	 */
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	buf->f_frsize = dentry->d_sb->s_blocksize;
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	/*
	 * On most *nix systems, f_blocks, f_bfree, and f_bavail
	 * are reported in units of f_frsize.  Linux hasn't had
	 * an f_frsize field in its statfs struct until recently,
	 * thus historically Linux's sys_statfs reports these
	 * fields in units of f_bsize.
	 */
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	buf->f_bsize = dentry->d_sb->s_blocksize;
	blockbits = dentry->d_sb->s_blocksize_bits;
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	blockres = (1 << blockbits) - 1;
	buf->f_blocks = (res.tbytes + blockres) >> blockbits;
	buf->f_bfree = (res.fbytes + blockres) >> blockbits;
	buf->f_bavail = (res.abytes + blockres) >> blockbits;

	buf->f_files = res.tfiles;
	buf->f_ffree = res.afiles;

	buf->f_namelen = server->namelen;
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	return 0;

 out_err:
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	dprintk("%s: statfs error = %d\n", __func__, -error);
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	return error;
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}

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/*
 * Map the security flavour number to a name
 */
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static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
{
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	static const struct {
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		rpc_authflavor_t flavour;
		const char *str;
	} sec_flavours[] = {
		{ RPC_AUTH_NULL, "null" },
		{ RPC_AUTH_UNIX, "sys" },
		{ RPC_AUTH_GSS_KRB5, "krb5" },
		{ RPC_AUTH_GSS_KRB5I, "krb5i" },
		{ RPC_AUTH_GSS_KRB5P, "krb5p" },
		{ RPC_AUTH_GSS_LKEY, "lkey" },
		{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
		{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
		{ RPC_AUTH_GSS_SPKM, "spkm" },
		{ RPC_AUTH_GSS_SPKMI, "spkmi" },
		{ RPC_AUTH_GSS_SPKMP, "spkmp" },
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		{ UINT_MAX, "unknown" }
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	};
	int i;

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	for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
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		if (sec_flavours[i].flavour == flavour)
			break;
	}
	return sec_flavours[i].str;
}

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static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
				    int showdefaults)
{
	struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;

	switch (sap->sa_family) {
	case AF_INET: {
		struct sockaddr_in *sin = (struct sockaddr_in *)sap;
		seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
				NIPQUAD(sin->sin_addr.s_addr));
		break;
	}
	case AF_INET6: {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
		seq_printf(m, ",mountaddr=" NIP6_FMT,
				NIP6(sin6->sin6_addr));
		break;
	}
	default:
		if (showdefaults)
			seq_printf(m, ",mountaddr=unspecified");
	}

	if (nfss->mountd_version || showdefaults)
		seq_printf(m, ",mountvers=%u", nfss->mountd_version);
	if (nfss->mountd_port || showdefaults)
		seq_printf(m, ",mountport=%u", nfss->mountd_port);

	switch (nfss->mountd_protocol) {
	case IPPROTO_UDP:
		seq_printf(m, ",mountproto=udp");
		break;
	case IPPROTO_TCP:
		seq_printf(m, ",mountproto=tcp");
		break;
	default:
		if (showdefaults)
			seq_printf(m, ",mountproto=auto");
	}
}

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/*
 * Describe the mount options in force on this server representation
 */
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static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
				   int showdefaults)
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{
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	static const struct proc_nfs_info {
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		int flag;
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		const char *str;
		const char *nostr;
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	} nfs_info[] = {
		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
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		{ NFS_MOUNT_INTR, ",intr", ",nointr" },
		{ NFS_MOUNT_POSIX, ",posix", "" },
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		{ NFS_MOUNT_NOCTO, ",nocto", "" },
		{ NFS_MOUNT_NOAC, ",noac", "" },
		{ NFS_MOUNT_NONLM, ",nolock", "" },
		{ NFS_MOUNT_NOACL, ",noacl", "" },
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		{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
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		{ NFS_MOUNT_UNSHARED, ",nosharecache", ""},
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		{ 0, NULL, NULL }
	};
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	const struct proc_nfs_info *nfs_infop;
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	struct nfs_client *clp = nfss->nfs_client;
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	u32 version = clp->rpc_ops->version;
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	seq_printf(m, ",vers=%u", version);
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	seq_printf(m, ",rsize=%u", nfss->rsize);
	seq_printf(m, ",wsize=%u", nfss->wsize);
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	if (nfss->bsize != 0)
		seq_printf(m, ",bsize=%u", nfss->bsize);
	seq_printf(m, ",namlen=%u", nfss->namelen);
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	if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
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		seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
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	if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
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		seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
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	if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
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		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
536
	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
537
		seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
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	for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
		if (nfss->flags & nfs_infop->flag)
			seq_puts(m, nfs_infop->str);
		else
			seq_puts(m, nfs_infop->nostr);
	}
544 545
	seq_printf(m, ",proto=%s",
		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
546 547 548 549 550 551 552
	if (version == 4) {
		if (nfss->port != NFS_PORT)
			seq_printf(m, ",port=%u", nfss->port);
	} else
		if (nfss->port)
			seq_printf(m, ",port=%u", nfss->port);

553 554
	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
555
	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
556 557 558 559 560 561 562 563

	if (version != 4)
		nfs_show_mountd_options(m, nfss, showdefaults);

#ifdef CONFIG_NFS_V4
	if (clp->rpc_ops->version == 4)
		seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
#endif
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}

/*
 * Describe the mount options on this VFS mountpoint
 */
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);

	nfs_show_mount_options(m, nfss, 0);

575 576 577
	seq_printf(m, ",addr=%s",
			rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
							RPC_DISPLAY_ADDR));
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	return 0;
}

/*
 * Present statistical information for this VFS mountpoint
 */
static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
{
	int i, cpu;
	struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
	struct rpc_auth *auth = nfss->client->cl_auth;
	struct nfs_iostats totals = { };

	seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);

	/*
	 * Display all mount option settings
	 */
	seq_printf(m, "\n\topts:\t");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
	nfs_show_mount_options(m, nfss, 1);

	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);

	seq_printf(m, "\n\tcaps:\t");
	seq_printf(m, "caps=0x%x", nfss->caps);
608 609 610 611
	seq_printf(m, ",wtmult=%u", nfss->wtmult);
	seq_printf(m, ",dtsize=%u", nfss->dtsize);
	seq_printf(m, ",bsize=%u", nfss->bsize);
	seq_printf(m, ",namlen=%u", nfss->namelen);
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#ifdef CONFIG_NFS_V4
614
	if (nfss->nfs_client->rpc_ops->version == 4) {
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		seq_printf(m, "\n\tnfsv4:\t");
		seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
		seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
		seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
	}
#endif

	/*
	 * Display security flavor in effect for this mount
	 */
625
	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
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	if (auth->au_flavor)
627
		seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
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	/*
	 * Display superblock I/O counters
	 */
	for_each_possible_cpu(cpu) {
		struct nfs_iostats *stats;

		preempt_disable();
		stats = per_cpu_ptr(nfss->io_stats, cpu);

		for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
			totals.events[i] += stats->events[i];
		for (i = 0; i < __NFSIOS_BYTESMAX; i++)
			totals.bytes[i] += stats->bytes[i];

		preempt_enable();
	}

	seq_printf(m, "\n\tevents:\t");
	for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
		seq_printf(m, "%lu ", totals.events[i]);
	seq_printf(m, "\n\tbytes:\t");
	for (i = 0; i < __NFSIOS_BYTESMAX; i++)
		seq_printf(m, "%Lu ", totals.bytes[i]);
	seq_printf(m, "\n");

	rpc_print_iostats(m, nfss->client);

	return 0;
}

/*
 * Begin unmount by attempting to remove all automounted mountpoints we added
661
 * in response to xdev traversals and referrals
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 */
663
static void nfs_umount_begin(struct super_block *sb)
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{
665
	struct nfs_server *server = NFS_SB(sb);
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	struct rpc_clnt *rpc;

	/* -EIO all pending I/O */
	rpc = server->client_acl;
	if (!IS_ERR(rpc))
		rpc_killall_tasks(rpc);
	rpc = server->client;
	if (!IS_ERR(rpc))
		rpc_killall_tasks(rpc);
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}

677
/*
678 679 680 681
 * Sanity-check a server address provided by the mount command.
 *
 * Address family must be initialized, and address must not be
 * the ANY address for that family.
682 683 684 685 686
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
687
		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
689 690 691 692
	}
	case AF_INET6: {
		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
		return !ipv6_addr_any(sa);
693 694 695 696 697 698
	}
	}

	return 0;
}

699 700
static void nfs_parse_ipv4_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
701
{
702 703
	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
	u8 *addr = (u8 *)&sin->sin_addr.s_addr;
704

705 706 707 708 709 710 711
	if (str_len <= INET_ADDRSTRLEN) {
		dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
				(int)str_len, string);

		sin->sin_family = AF_INET;
		*addr_len = sizeof(*sin);
		if (in4_pton(string, str_len, addr, '\0', NULL))
712
			return;
713 714 715 716 717 718 719
	}

	sap->sa_family = AF_UNSPEC;
	*addr_len = 0;
}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
720 721 722
static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
				   const char *delim,
				   struct sockaddr_in6 *sin6)
723 724 725 726
{
	char *p;
	size_t len;

727 728 729
	if ((string + str_len) == delim)
		return 1;

730
	if (*delim != IPV6_SCOPE_DELIMITER)
731 732 733 734
		return 0;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return 0;
735 736 737 738 739 740 741 742 743 744 745 746

	len = (string + str_len) - delim - 1;
	p = kstrndup(delim + 1, len, GFP_KERNEL);
	if (p) {
		unsigned long scope_id = 0;
		struct net_device *dev;

		dev = dev_get_by_name(&init_net, p);
		if (dev != NULL) {
			scope_id = dev->ifindex;
			dev_put(dev);
		} else {
747 748 749 750
			if (strict_strtoul(p, 10, &scope_id) == 0) {
				kfree(p);
				return 0;
			}
751 752 753
		}

		kfree(p);
754

755 756
		sin6->sin6_scope_id = scope_id;
		dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
757
		return 1;
758
	}
759 760

	return 0;
761 762
}

763 764 765 766 767
static void nfs_parse_ipv6_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
{
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
	u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
768
	const char *delim;
769 770 771 772

	if (str_len <= INET6_ADDRSTRLEN) {
		dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
				(int)str_len, string);
773

774 775
		sin6->sin6_family = AF_INET6;
		*addr_len = sizeof(*sin6);
776 777 778 779 780
		if (in6_pton(string, str_len, addr,
					IPV6_SCOPE_DELIMITER, &delim) != 0) {
			if (nfs_parse_ipv6_scope_id(string, str_len,
							delim, sin6) != 0)
				return;
781
		}
782
	}
783 784

	sap->sa_family = AF_UNSPEC;
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
	*addr_len = 0;
}
#else
static void nfs_parse_ipv6_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
{
	sap->sa_family = AF_UNSPEC;
	*addr_len = 0;
}
#endif

/*
 * Construct a sockaddr based on the contents of a string that contains
 * an IP address in presentation format.
 *
 * If there is a problem constructing the new sockaddr, set the address
 * family to AF_UNSPEC.
 */
803
void nfs_parse_ip_address(char *string, size_t str_len,
804 805 806 807 808 809 810 811 812 813 814 815 816
				 struct sockaddr *sap, size_t *addr_len)
{
	unsigned int i, colons;

	colons = 0;
	for (i = 0; i < str_len; i++)
		if (string[i] == ':')
			colons++;

	if (colons >= 2)
		nfs_parse_ipv6_address(string, str_len, sap, addr_len);
	else
		nfs_parse_ipv4_address(string, str_len, sap, addr_len);
817 818
}

819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
/*
 * Sanity check the NFS transport protocol.
 *
 */
static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
{
	switch (mnt->nfs_server.protocol) {
	case XPRT_TRANSPORT_UDP:
	case XPRT_TRANSPORT_TCP:
	case XPRT_TRANSPORT_RDMA:
		break;
	default:
		mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
	}
}

/*
 * For text based NFSv2/v3 mounts, the mount protocol transport default
 * settings should depend upon the specified NFS transport.
 */
static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
{
	nfs_validate_transport_protocol(mnt);

	if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
	    mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
			return;
	switch (mnt->nfs_server.protocol) {
	case XPRT_TRANSPORT_UDP:
		mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
		break;
	case XPRT_TRANSPORT_TCP:
	case XPRT_TRANSPORT_RDMA:
		mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
	}
}

856 857 858
/*
 * Parse the value of the 'sec=' option.
 *
859
 * The flavor_len setting is for v4 mounts.
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
 */
static int nfs_parse_security_flavors(char *value,
				      struct nfs_parsed_mount_data *mnt)
{
	substring_t args[MAX_OPT_ARGS];

	dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);

	switch (match_token(value, nfs_secflavor_tokens, args)) {
	case Opt_sec_none:
		mnt->auth_flavor_len = 0;
		mnt->auth_flavors[0] = RPC_AUTH_NULL;
		break;
	case Opt_sec_sys:
		mnt->auth_flavor_len = 0;
		mnt->auth_flavors[0] = RPC_AUTH_UNIX;
		break;
	case Opt_sec_krb5:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
		break;
	case Opt_sec_krb5i:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
		break;
	case Opt_sec_krb5p:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
		break;
	case Opt_sec_lkey:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
		break;
	case Opt_sec_lkeyi:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
		break;
	case Opt_sec_lkeyp:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
		break;
	case Opt_sec_spkm:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
		break;
	case Opt_sec_spkmi:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
		break;
	case Opt_sec_spkmp:
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
		break;
	default:
		return 0;
	}

	return 1;
}

920 921 922 923 924
static void nfs_parse_invalid_value(const char *option)
{
	dfprintk(MOUNT, "NFS:   bad value specified for %s option\n", option);
}

925 926
/*
 * Error-check and convert a string of mount options from user space into
927 928 929
 * a data structure.  The whole mount string is processed; bad options are
 * skipped as they are encountered.  If there were no errors, return 1;
 * otherwise return 0 (zero).
930 931 932 933
 */
static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
934
	char *p, *string, *secdata;
935
	int rc, sloppy = 0, errors = 0;
936 937 938 939 940 941 942

	if (!raw) {
		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
		return 1;
	}
	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);

943 944 945 946 947 948 949 950 951 952 953 954 955 956
	secdata = alloc_secdata();
	if (!secdata)
		goto out_nomem;

	rc = security_sb_copy_data(raw, secdata);
	if (rc)
		goto out_security_failure;

	rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
	if (rc)
		goto out_security_failure;

	free_secdata(secdata);

957 958 959 960 961 962 963 964 965 966 967
	while ((p = strsep(&raw, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int option, token;

		if (!*p)
			continue;

		dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);

		token = match_token(p, nfs_mount_option_tokens, args);
		switch (token) {
968 969 970 971

		/*
		 * boolean options:  foo/nofoo
		 */
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
		case Opt_soft:
			mnt->flags |= NFS_MOUNT_SOFT;
			break;
		case Opt_hard:
			mnt->flags &= ~NFS_MOUNT_SOFT;
			break;
		case Opt_posix:
			mnt->flags |= NFS_MOUNT_POSIX;
			break;
		case Opt_noposix:
			mnt->flags &= ~NFS_MOUNT_POSIX;
			break;
		case Opt_cto:
			mnt->flags &= ~NFS_MOUNT_NOCTO;
			break;
		case Opt_nocto:
			mnt->flags |= NFS_MOUNT_NOCTO;
			break;
		case Opt_ac:
			mnt->flags &= ~NFS_MOUNT_NOAC;
			break;
		case Opt_noac:
			mnt->flags |= NFS_MOUNT_NOAC;
			break;
		case Opt_lock:
			mnt->flags &= ~NFS_MOUNT_NONLM;
			break;
		case Opt_nolock:
			mnt->flags |= NFS_MOUNT_NONLM;
			break;
		case Opt_v2:
			mnt->flags &= ~NFS_MOUNT_VER3;
			break;
		case Opt_v3:
			mnt->flags |= NFS_MOUNT_VER3;
			break;
		case Opt_udp:
			mnt->flags &= ~NFS_MOUNT_TCP;
1010
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1011 1012 1013
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
1014
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1015
			break;
\
\"Talpey, Thomas\ 已提交
1016 1017 1018 1019
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			break;
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
		case Opt_acl:
			mnt->flags &= ~NFS_MOUNT_NOACL;
			break;
		case Opt_noacl:
			mnt->flags |= NFS_MOUNT_NOACL;
			break;
		case Opt_rdirplus:
			mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
			break;
		case Opt_nordirplus:
			mnt->flags |= NFS_MOUNT_NORDIRPLUS;
			break;
1032 1033 1034 1035 1036 1037
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
1038

1039 1040 1041
		/*
		 * options that take numeric values
		 */
1042
		case Opt_port:
1043 1044 1045 1046 1047 1048
			if (match_int(args, &option) ||
			    option < 0 || option > USHORT_MAX) {
				errors++;
				nfs_parse_invalid_value("port");
			} else
				mnt->nfs_server.port = option;
1049 1050
			break;
		case Opt_rsize:
1051 1052 1053 1054 1055
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("rsize");
			} else
				mnt->rsize = option;
1056 1057
			break;
		case Opt_wsize:
1058 1059 1060 1061 1062
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("wsize");
			} else
				mnt->wsize = option;
1063 1064
			break;
		case Opt_bsize:
1065 1066 1067 1068 1069
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("bsize");
			} else
				mnt->bsize = option;
1070 1071
			break;
		case Opt_timeo:
1072 1073 1074 1075 1076
			if (match_int(args, &option) || option <= 0) {
				errors++;
				nfs_parse_invalid_value("timeo");
			} else
				mnt->timeo = option;
1077 1078
			break;
		case Opt_retrans:
1079 1080 1081 1082 1083
			if (match_int(args, &option) || option <= 0) {
				errors++;
				nfs_parse_invalid_value("retrans");
			} else
				mnt->retrans = option;
1084 1085
			break;
		case Opt_acregmin:
1086 1087 1088 1089 1090
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acregmin");
			} else
				mnt->acregmin = option;
1091 1092
			break;
		case Opt_acregmax:
1093 1094 1095 1096 1097
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acregmax");
			} else
				mnt->acregmax = option;
1098 1099
			break;
		case Opt_acdirmin:
1100 1101 1102 1103 1104
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acdirmin");
			} else
				mnt->acdirmin = option;
1105 1106
			break;
		case Opt_acdirmax:
1107 1108 1109 1110 1111
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acdirmax");
			} else
				mnt->acdirmax = option;
1112 1113
			break;
		case Opt_actimeo:
1114 1115 1116 1117 1118 1119
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("actimeo");
			} else
				mnt->acregmin = mnt->acregmax =
				mnt->acdirmin = mnt->acdirmax = option;
1120 1121
			break;
		case Opt_namelen:
1122 1123 1124 1125 1126
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("namlen");
			} else
				mnt->namlen = option;
1127 1128
			break;
		case Opt_mountport:
1129 1130 1131 1132 1133 1134
			if (match_int(args, &option) ||
			    option < 0 || option > USHORT_MAX) {
				errors++;
				nfs_parse_invalid_value("mountport");
			} else
				mnt->mount_server.port = option;
1135 1136
			break;
		case Opt_mountvers:
1137 1138 1139 1140 1141 1142 1143
			if (match_int(args, &option) ||
			    option < NFS_MNT_VERSION ||
			    option > NFS_MNT3_VERSION) {
				errors++;
				nfs_parse_invalid_value("mountvers");
			} else
				mnt->mount_server.version = option;
1144 1145
			break;
		case Opt_nfsvers:
1146 1147 1148 1149 1150
			if (match_int(args, &option)) {
				errors++;
				nfs_parse_invalid_value("nfsvers");
				break;
			}
1151
			switch (option) {
1152
			case NFS2_VERSION:
1153 1154
				mnt->flags &= ~NFS_MOUNT_VER3;
				break;
1155
			case NFS3_VERSION:
1156 1157 1158
				mnt->flags |= NFS_MOUNT_VER3;
				break;
			default:
1159 1160
				errors++;
				nfs_parse_invalid_value("nfsvers");
1161 1162 1163
			}
			break;

1164 1165 1166
		/*
		 * options that take text values
		 */
1167 1168 1169 1170
		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1171
			rc = nfs_parse_security_flavors(string, mnt);
1172
			kfree(string);
1173 1174 1175 1176 1177
			if (!rc) {
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"security flavor\n");
			}
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
			break;
		case Opt_proto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
1188
			case Opt_xprt_udp:
1189
				mnt->flags &= ~NFS_MOUNT_TCP;
1190
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1191
				break;
1192
			case Opt_xprt_tcp:
1193
				mnt->flags |= NFS_MOUNT_TCP;
1194
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1195
				break;
\
\"Talpey, Thomas\ 已提交
1196 1197 1198 1199 1200
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				break;
1201
			default:
1202 1203 1204
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
			}
			break;
		case Opt_mountproto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
1216
			case Opt_xprt_udp:
1217
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1218
				break;
1219
			case Opt_xprt_tcp:
1220
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1221
				break;
\
\"Talpey, Thomas\ 已提交
1222
			case Opt_xprt_rdma: /* not used for side protocols */
1223
			default:
1224 1225 1226
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1227 1228 1229 1230 1231 1232
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1233 1234 1235 1236
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->nfs_server.address,
					     &mnt->nfs_server.addrlen);
1237 1238 1239 1240 1241 1242
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1243
			kfree(mnt->client_address);
1244 1245
			mnt->client_address = string;
			break;
1246 1247 1248 1249
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1250
			kfree(mnt->mount_server.hostname);
1251 1252
			mnt->mount_server.hostname = string;
			break;
1253
		case Opt_mountaddr:
1254 1255 1256
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1257 1258 1259 1260
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->mount_server.address,
					     &mnt->mount_server.addrlen);
1261 1262
			kfree(string);
			break;
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
		case Opt_lookupcache:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					nfs_lookupcache_tokens, args);
			kfree(string);
			switch (token) {
				case Opt_lookupcache_all:
					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
					break;
				case Opt_lookupcache_positive:
					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
					break;
				case Opt_lookupcache_none:
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
					break;
				default:
					errors++;
					dfprintk(MOUNT, "NFS:   invalid "
							"lookupcache argument\n");
			};
			break;
1287

1288 1289 1290 1291 1292 1293 1294
		/*
		 * Special options
		 */
		case Opt_sloppy:
			sloppy = 1;
			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
			break;
1295 1296
		case Opt_userspace:
		case Opt_deprecated:
1297 1298
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
1299 1300 1301
			break;

		default:
1302 1303 1304
			errors++;
			dfprintk(MOUNT, "NFS:   unrecognized mount option "
					"'%s'\n", p);
1305 1306 1307
		}
	}

1308 1309 1310 1311 1312 1313
	if (errors > 0) {
		dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
				errors, (errors == 1 ? "" : "s"));
		if (!sloppy)
			return 0;
	}
1314 1315 1316 1317 1318
	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1319 1320 1321 1322
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1323 1324
}

1325 1326 1327 1328 1329 1330 1331
/*
 * Use the remote server's MOUNT service to request the NFS file handle
 * corresponding to the provided path.
 */
static int nfs_try_mount(struct nfs_parsed_mount_data *args,
			 struct nfs_fh *root_fh)
{
1332
	struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1333
	char *hostname;
1334
	int status;
1335 1336 1337 1338 1339 1340 1341 1342

	if (args->mount_server.version == 0) {
		if (args->flags & NFS_MOUNT_VER3)
			args->mount_server.version = NFS_MNT3_VERSION;
		else
			args->mount_server.version = NFS_MNT_VERSION;
	}

1343 1344 1345 1346 1347
	if (args->mount_server.hostname)
		hostname = args->mount_server.hostname;
	else
		hostname = args->nfs_server.hostname;

1348 1349 1350
	/*
	 * Construct the mount server's address.
	 */
1351 1352 1353 1354 1355 1356
	if (args->mount_server.address.ss_family == AF_UNSPEC) {
		memcpy(sap, &args->nfs_server.address,
		       args->nfs_server.addrlen);
		args->mount_server.addrlen = args->nfs_server.addrlen;
	}

1357 1358 1359
	/*
	 * autobind will be used if mount_server.port == 0
	 */
1360
	nfs_set_port(sap, args->mount_server.port);
1361 1362 1363 1364 1365

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1366 1367
	status = nfs_mount(sap,
			   args->mount_server.addrlen,
1368
			   hostname,
1369 1370 1371 1372
			   args->nfs_server.export_path,
			   args->mount_server.version,
			   args->mount_server.protocol,
			   root_fh);
1373 1374
	if (status == 0)
		return 0;
1375

1376
	dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1377
			hostname, status);
1378 1379 1380
	return status;
}

1381 1382 1383
static int nfs_parse_simple_hostname(const char *dev_name,
				     char **hostname, size_t maxnamlen,
				     char **export_path, size_t maxpathlen)
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
{
	size_t len;
	char *colon, *comma;

	colon = strchr(dev_name, ':');
	if (colon == NULL)
		goto out_bad_devname;

	len = colon - dev_name;
	if (len > maxnamlen)
		goto out_hostname;

	/* N.B. caller will free nfs_server.hostname in all cases */
	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
	if (!*hostname)
		goto out_nomem;

	/* kill possible hostname list: not supported */
	comma = strchr(*hostname, ',');
	if (comma != NULL) {
		if (comma == *hostname)
			goto out_bad_devname;
		*comma = '\0';
	}

	colon++;
	len = strlen(colon);
	if (len > maxpathlen)
		goto out_path;
	*export_path = kstrndup(colon, len, GFP_KERNEL);
	if (!*export_path)
		goto out_nomem;

	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
	return 0;

out_bad_devname:
	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
	return -EINVAL;

out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
	return -ENOMEM;

out_hostname:
	dfprintk(MOUNT, "NFS: server hostname too long\n");
	return -ENAMETOOLONG;

out_path:
	dfprintk(MOUNT, "NFS: export pathname too long\n");
	return -ENAMETOOLONG;
}

1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
/*
 * Hostname has square brackets around it because it contains one or
 * more colons.  We look for the first closing square bracket, and a
 * colon must follow it.
 */
static int nfs_parse_protected_hostname(const char *dev_name,
					char **hostname, size_t maxnamlen,
					char **export_path, size_t maxpathlen)
{
	size_t len;
	char *start, *end;

	start = (char *)(dev_name + 1);

	end = strchr(start, ']');
	if (end == NULL)
		goto out_bad_devname;
	if (*(end + 1) != ':')
		goto out_bad_devname;

	len = end - start;
	if (len > maxnamlen)
		goto out_hostname;

	/* N.B. caller will free nfs_server.hostname in all cases */
	*hostname = kstrndup(start, len, GFP_KERNEL);
	if (*hostname == NULL)
		goto out_nomem;

	end += 2;
	len = strlen(end);
	if (len > maxpathlen)
		goto out_path;
	*export_path = kstrndup(end, len, GFP_KERNEL);
	if (!*export_path)
		goto out_nomem;

	return 0;

out_bad_devname:
	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
	return -EINVAL;

out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
	return -ENOMEM;

out_hostname:
	dfprintk(MOUNT, "NFS: server hostname too long\n");
	return -ENAMETOOLONG;

out_path:
	dfprintk(MOUNT, "NFS: export pathname too long\n");
	return -ENAMETOOLONG;
}

/*
 * Split "dev_name" into "hostname:export_path".
 *
 * The leftmost colon demarks the split between the server's hostname
 * and the export path.  If the hostname starts with a left square
 * bracket, then it may contain colons.
 *
 * Note: caller frees hostname and export path, even on error.
 */
static int nfs_parse_devname(const char *dev_name,
			     char **hostname, size_t maxnamlen,
			     char **export_path, size_t maxpathlen)
{
	if (*dev_name == '[')
		return nfs_parse_protected_hostname(dev_name,
						    hostname, maxnamlen,
						    export_path, maxpathlen);

	return nfs_parse_simple_hostname(dev_name,
					 hostname, maxnamlen,
					 export_path, maxpathlen);
}

D
David Howells 已提交
1516
/*
1517 1518
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
 *
 * For option strings, user space handles the following behaviors:
 *
 * + DNS: mapping server host name to IP address ("addr=" option)
 *
 * + failure mode: how to behave if a mount request can't be handled
 *   immediately ("fg/bg" option)
 *
 * + retry: how often to retry a mount request ("retry=" option)
 *
 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
 *   mountproto=tcp after mountproto=udp, and so on
D
David Howells 已提交
1531
 */
1532 1533
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1534 1535
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1536
{
1537
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1538

1539 1540
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1541

1542 1543 1544
	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
1545 1546 1547 1548
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
1549 1550
	args->mount_server.port	= 0;	/* autobind unless user sets port */
	args->nfs_server.port	= 0;	/* autobind unless user sets port */
1551
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1552
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
1553

1554
	switch (data->version) {
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
	case 1:
		data->namlen = 0;
	case 2:
		data->bsize = 0;
	case 3:
		if (data->flags & NFS_MOUNT_VER3)
			goto out_no_v3;
		data->root.size = NFS2_FHSIZE;
		memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
	case 4:
		if (data->flags & NFS_MOUNT_SECFLAVOUR)
			goto out_no_sec;
	case 5:
		memset(data->context, 0, sizeof(data->context));
	case 6:
1570 1571 1572
		if (data->flags & NFS_MOUNT_VER3) {
			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
				goto out_invalid_fh;
1573
			mntfh->size = data->root.size;
1574
		} else
1575 1576 1577 1578 1579 1580 1581
			mntfh->size = NFS2_FHSIZE;


		memcpy(mntfh->data, data->root.data, mntfh->size);
		if (mntfh->size < sizeof(mntfh->data))
			memset(mntfh->data + mntfh->size, 0,
			       sizeof(mntfh->data) - mntfh->size);
1582

1583 1584 1585 1586
		/*
		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
		 * can deal with.
		 */
1587
		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
1588 1589 1590 1591 1592 1593 1594 1595
		args->rsize		= data->rsize;
		args->wsize		= data->wsize;
		args->timeo		= data->timeo;
		args->retrans		= data->retrans;
		args->acregmin		= data->acregmin;
		args->acregmax		= data->acregmax;
		args->acdirmin		= data->acdirmin;
		args->acdirmax		= data->acdirmax;
1596 1597 1598 1599 1600 1601 1602 1603

		memcpy(&args->nfs_server.address, &data->addr,
		       sizeof(data->addr));
		args->nfs_server.addrlen = sizeof(data->addr);
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1604
		if (!(data->flags & NFS_MOUNT_TCP))
1605
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1606 1607 1608 1609
		/* N.B. caller will free nfs_server.hostname in all cases */
		args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
		args->namlen		= data->namlen;
		args->bsize		= data->bsize;
1610 1611 1612

		if (data->flags & NFS_MOUNT_SECFLAVOUR)
			args->auth_flavors[0] = data->pseudoflavor;
1613 1614
		if (!args->nfs_server.hostname)
			goto out_nomem;
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641

		/*
		 * The legacy version 6 binary mount data from userspace has a
		 * field used only to transport selinux information into the
		 * the kernel.  To continue to support that functionality we
		 * have a touch of selinux knowledge here in the NFS code. The
		 * userspace code converted context=blah to just blah so we are
		 * converting back to the full string selinux understands.
		 */
		if (data->context[0]){
#ifdef CONFIG_SECURITY_SELINUX
			int rc;
			char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
			if (!opts_str)
				return -ENOMEM;
			strcpy(opts_str, "context=");
			data->context[NFS_MAX_CONTEXT_LEN] = '\0';
			strcat(opts_str, &data->context[0]);
			rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
			kfree(opts_str);
			if (rc)
				return rc;
#else
			return -EINVAL;
#endif
		}

1642
		break;
1643 1644 1645
	default: {
		int status;

1646 1647
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1648

1649 1650 1651 1652
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1653 1654 1655
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

1656 1657
		nfs_set_mount_transport_protocol(args);

1658 1659 1660 1661 1662 1663 1664
		status = nfs_parse_devname(dev_name,
					   &args->nfs_server.hostname,
					   PAGE_SIZE,
					   &args->nfs_server.export_path,
					   NFS_MAXPATHLEN);
		if (!status)
			status = nfs_try_mount(args, mntfh);
1665

1666 1667
		kfree(args->nfs_server.export_path);
		args->nfs_server.export_path = NULL;
1668 1669

		if (status)
1670
			return status;
1671 1672 1673

		break;
		}
D
David Howells 已提交
1674
	}
1675 1676

#ifndef CONFIG_NFS_V3
1677
	if (args->flags & NFS_MOUNT_VER3)
1678 1679
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1680

1681
	return 0;
D
David Howells 已提交
1682

1683 1684 1685
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1686

1687 1688 1689 1690
out_no_v3:
	dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
		 data->version);
	return -EINVAL;
D
David Howells 已提交
1691

1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
out_no_sec:
	dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
	return -EINVAL;

#ifndef CONFIG_NFS_V3
out_v3_not_compiled:
	dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
	return -EPROTONOSUPPORT;
#endif /* !CONFIG_NFS_V3 */

1702 1703 1704 1705
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1706 1707 1708 1709 1710 1711 1712
out_no_address:
	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
	return -EINVAL;

out_invalid_fh:
	dfprintk(MOUNT, "NFS: invalid root filehandle\n");
	return -EINVAL;
D
David Howells 已提交
1713 1714
}

1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
static int
nfs_compare_remount_data(struct nfs_server *nfss,
			 struct nfs_parsed_mount_data *data)
{
	if (data->flags != nfss->flags ||
	    data->rsize != nfss->rsize ||
	    data->wsize != nfss->wsize ||
	    data->retrans != nfss->client->cl_timeout->to_retries ||
	    data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
	    data->acregmin != nfss->acregmin / HZ ||
	    data->acregmax != nfss->acregmax / HZ ||
	    data->acdirmin != nfss->acdirmin / HZ ||
	    data->acdirmax != nfss->acdirmax / HZ ||
	    data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
	    data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
	    memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
		   data->nfs_server.addrlen) != 0)
		return -EINVAL;

	return 0;
}

static int
nfs_remount(struct super_block *sb, int *flags, char *raw_data)
{
	int error;
	struct nfs_server *nfss = sb->s_fs_info;
	struct nfs_parsed_mount_data *data;
	struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
	struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1745
	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1746 1747 1748 1749 1750 1751 1752

	/*
	 * Userspace mount programs that send binary options generally send
	 * them populated with default values. We have no way to know which
	 * ones were explicitly specified. Fall back to legacy behavior and
	 * just return success.
	 */
1753 1754 1755
	if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
	    (nfsvers <= 3 && (!options || (options->version >= 1 &&
					   options->version <= 6))))
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
		return 0;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	/* fill out struct with values from existing mount */
	data->flags = nfss->flags;
	data->rsize = nfss->rsize;
	data->wsize = nfss->wsize;
	data->retrans = nfss->client->cl_timeout->to_retries;
	data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
	data->acregmin = nfss->acregmin / HZ;
	data->acregmax = nfss->acregmax / HZ;
	data->acdirmin = nfss->acdirmin / HZ;
	data->acdirmax = nfss->acdirmax / HZ;
	data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
	data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
	memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
		data->nfs_server.addrlen);

	/* overwrite those values with any that were specified */
	error = nfs_parse_mount_options((char *)options, data);
	if (error < 0)
		goto out;

	/* compare new mount options with old ones */
	error = nfs_compare_remount_data(nfss, data);
out:
	kfree(data);
	return error;
}

D
David Howells 已提交
1789
/*
1790
 * Initialise the common bits of the superblock
D
David Howells 已提交
1791
 */
1792
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1793
{
1794
	struct nfs_server *server = NFS_SB(sb);
1795

1796
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1797

1798 1799 1800
	/* We probably want something more informative here */
	snprintf(sb->s_id, sizeof(sb->s_id),
		 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1801

1802 1803 1804
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1805

1806 1807
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1808

1809
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1810 1811 1812
}

/*
1813
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1814
 */
1815 1816
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1817 1818
{
	struct nfs_server *server = NFS_SB(sb);
1819

1820 1821 1822 1823
	sb->s_blocksize_bits = 0;
	sb->s_blocksize = 0;
	if (data->bsize)
		sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
D
David Howells 已提交
1824

1825 1826 1827 1828 1829 1830
	if (server->flags & NFS_MOUNT_VER3) {
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
1831
	}
1832 1833 1834

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1835 1836 1837
}

/*
1838
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1839
 */
1840 1841
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1842
{
1843 1844 1845 1846 1847
	struct nfs_server *server = NFS_SB(sb);

	sb->s_blocksize_bits = old_sb->s_blocksize_bits;
	sb->s_blocksize = old_sb->s_blocksize;
	sb->s_maxbytes = old_sb->s_maxbytes;
D
David Howells 已提交
1848 1849

	if (server->flags & NFS_MOUNT_VER3) {
1850 1851
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1852 1853 1854 1855 1856
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1857 1858
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1859 1860
}

1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)

static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
{
	const struct nfs_server *a = s->s_fs_info;
	const struct rpc_clnt *clnt_a = a->client;
	const struct rpc_clnt *clnt_b = b->client;

	if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
		goto Ebusy;
	if (a->nfs_client != b->nfs_client)
		goto Ebusy;
	if (a->flags != b->flags)
		goto Ebusy;
	if (a->wsize != b->wsize)
		goto Ebusy;
	if (a->rsize != b->rsize)
		goto Ebusy;
	if (a->acregmin != b->acregmin)
		goto Ebusy;
	if (a->acregmax != b->acregmax)
		goto Ebusy;
	if (a->acdirmin != b->acdirmin)
		goto Ebusy;
	if (a->acdirmax != b->acdirmax)
		goto Ebusy;
	if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
		goto Ebusy;
T
Trond Myklebust 已提交
1889
	return 1;
1890
Ebusy:
T
Trond Myklebust 已提交
1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
	return 0;
}

struct nfs_sb_mountdata {
	struct nfs_server *server;
	int mntflags;
};

static int nfs_set_super(struct super_block *s, void *data)
{
	struct nfs_sb_mountdata *sb_mntdata = data;
	struct nfs_server *server = sb_mntdata->server;
	int ret;

	s->s_flags = sb_mntdata->mntflags;
	s->s_fs_info = server;
	ret = set_anon_super(s, server);
	if (ret == 0)
		server->s_dev = s->s_dev;
	return ret;
}

1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
static int nfs_compare_super_address(struct nfs_server *server1,
				     struct nfs_server *server2)
{
	struct sockaddr *sap1, *sap2;

	sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
	sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;

	if (sap1->sa_family != sap2->sa_family)
		return 0;

	switch (sap1->sa_family) {
	case AF_INET: {
		struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
		struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
		if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
			return 0;
		if (sin1->sin_port != sin2->sin_port)
			return 0;
		break;
	}
	case AF_INET6: {
		struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
		struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
		if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
			return 0;
		if (sin1->sin6_port != sin2->sin6_port)
			return 0;
		break;
	}
	default:
		return 0;
	}

	return 1;
}

T
Trond Myklebust 已提交
1950 1951 1952 1953 1954 1955
static int nfs_compare_super(struct super_block *sb, void *data)
{
	struct nfs_sb_mountdata *sb_mntdata = data;
	struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
	int mntflags = sb_mntdata->mntflags;

1956
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
1957 1958 1959 1960 1961 1962 1963
		return 0;
	/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
	if (old->flags & NFS_MOUNT_UNSHARED)
		return 0;
	if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
		return 0;
	return nfs_compare_mount_options(sb, server, mntflags);
1964 1965
}

1966 1967 1968 1969 1970
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

1971 1972
static int nfs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
D
David Howells 已提交
1973 1974 1975
{
	struct nfs_server *server = NULL;
	struct super_block *s;
1976 1977
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
1978
	struct dentry *mntroot;
1979
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1980 1981 1982
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1983 1984 1985 1986 1987 1988
	int error = -ENOMEM;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
1989

1990
	security_init_mnt_opts(&data->lsm_opts);
1991

1992
	/* Validate the mount data */
1993
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1994
	if (error < 0)
1995
		goto out;
D
David Howells 已提交
1996

1997
	/* Get a volume representation */
1998
	server = nfs_create_server(data, mntfh);
1999 2000
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2001
		goto out;
D
David Howells 已提交
2002
	}
T
Trond Myklebust 已提交
2003
	sb_mntdata.server = server;
D
David Howells 已提交
2004

2005 2006 2007
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2008
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2009
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2010 2011
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
2012
		goto out_err_nosb;
2013 2014
	}

2015 2016 2017
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2018 2019 2020 2021
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2022
	}
D
David Howells 已提交
2023

2024 2025
	if (!s->s_root) {
		/* initial superblock/root creation */
2026
		nfs_fill_super(s, data);
2027
	}
D
David Howells 已提交
2028

2029
	mntroot = nfs_get_root(s, mntfh);
2030 2031 2032
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2033
	}
2034

2035
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2036 2037 2038
	if (error)
		goto error_splat_root;

2039 2040 2041
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2042 2043 2044
	error = 0;

out:
2045 2046 2047 2048 2049 2050
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
2051
	return error;
2052

2053 2054
out_err_nosb:
	nfs_free_server(server);
2055
	goto out;
2056

2057 2058
error_splat_root:
	dput(mntroot);
2059 2060 2061
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2062
	goto out;
D
David Howells 已提交
2063 2064
}

2065 2066 2067
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
2068 2069 2070 2071
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

2072
	bdi_unregister(&server->backing_dev_info);
D
David Howells 已提交
2073
	kill_anon_super(s);
2074
	nfs_free_server(server);
D
David Howells 已提交
2075 2076
}

2077 2078 2079 2080 2081 2082
/*
 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
 */
static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
			   const char *dev_name, void *raw_data,
			   struct vfsmount *mnt)
D
David Howells 已提交
2083 2084
{
	struct nfs_clone_mount *data = raw_data;
2085 2086 2087
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2088
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2089 2090 2091
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2092
	int error;
D
David Howells 已提交
2093

2094
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
2095

2096 2097 2098 2099 2100 2101
	/* create a new volume representation */
	server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
		goto out_err_noserver;
	}
T
Trond Myklebust 已提交
2102
	sb_mntdata.server = server;
2103

2104 2105 2106
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2107
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2108
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2109 2110 2111 2112
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
2113

2114 2115 2116
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2117 2118 2119 2120
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
2121
	}
2122

2123 2124 2125 2126
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
	}
D
David Howells 已提交
2127

2128 2129 2130 2131
	mntroot = nfs_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2132
	}
2133
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2134 2135 2136 2137
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2138

2139 2140 2141
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
2142

2143 2144 2145
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

2146 2147
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
2148

2149 2150 2151 2152 2153
out_err_nosb:
	nfs_free_server(server);
out_err_noserver:
	dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
	return error;
D
David Howells 已提交
2154

2155 2156 2157 2158 2159
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2160 2161
}

2162 2163
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
2164
/*
2165
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
2166
 */
2167 2168
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
2169
{
2170 2171 2172
	sb->s_blocksize_bits = old_sb->s_blocksize_bits;
	sb->s_blocksize = old_sb->s_blocksize;
	sb->s_maxbytes = old_sb->s_maxbytes;
D
David Howells 已提交
2173
	sb->s_time_gran = 1;
2174 2175
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
2176 2177
}

2178 2179 2180 2181
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
2182
{
2183 2184 2185
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
2186 2187
}

2188 2189 2190
/*
 * Validate NFSv4 mount options
 */
2191 2192 2193
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
2194
{
2195
	struct sockaddr_in *ap;
2196
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2197 2198 2199 2200 2201
	char *c;

	if (data == NULL)
		goto out_no_data;

2202 2203
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
2204 2205 2206 2207
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
2208
	args->nfs_server.port	= NFS_PORT; /* 2049 unless user set port= */
2209 2210
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
	args->auth_flavor_len	= 0;
2211

2212 2213
	switch (data->version) {
	case 1:
2214 2215 2216 2217
		ap = (struct sockaddr_in *)&args->nfs_server.address;
		if (data->host_addrlen > sizeof(args->nfs_server.address))
			goto out_no_address;
		if (data->host_addrlen == 0)
2218
			goto out_no_address;
2219 2220
		args->nfs_server.addrlen = data->host_addrlen;
		if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2221
			return -EFAULT;
2222 2223
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
2224 2225
			goto out_no_address;

2226 2227 2228
		if (data->auth_flavourlen) {
			if (data->auth_flavourlen > 1)
				goto out_inval_auth;
2229
			if (copy_from_user(&args->auth_flavors[0],
2230
					   data->auth_flavours,
2231
					   sizeof(args->auth_flavors[0])))
2232 2233 2234 2235 2236 2237
				return -EFAULT;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2238
		args->nfs_server.hostname = c;
2239 2240 2241 2242

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2243 2244
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2245 2246 2247 2248

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
		args->client_address = c;

		/*
		 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
		 * can deal with.
		 */

		args->flags	= data->flags & NFS4_MOUNT_FLAGMASK;
		args->rsize	= data->rsize;
		args->wsize	= data->wsize;
		args->timeo	= data->timeo;
		args->retrans	= data->retrans;
		args->acregmin	= data->acregmin;
		args->acregmax	= data->acregmax;
		args->acdirmin	= data->acdirmin;
		args->acdirmax	= data->acdirmax;
		args->nfs_server.protocol = data->proto;
2266
		nfs_validate_transport_protocol(args);
2267 2268

		break;
2269
	default: {
2270
		int status;
2271 2272

		if (nfs_parse_mount_options((char *)options, args) == 0)
2273 2274 2275
			return -EINVAL;

		if (!nfs_verify_server_address((struct sockaddr *)
2276
						&args->nfs_server.address))
2277 2278
			return -EINVAL;

2279 2280 2281
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

2282 2283
		nfs_validate_transport_protocol(args);

2284
		if (args->auth_flavor_len > 1)
2285 2286
			goto out_inval_auth;

2287
		if (args->client_address == NULL)
2288 2289
			goto out_no_client_address;

2290 2291 2292 2293 2294 2295 2296 2297
		status = nfs_parse_devname(dev_name,
					   &args->nfs_server.hostname,
					   NFS4_MAXNAMLEN,
					   &args->nfs_server.export_path,
					   NFS4_MAXPATHLEN);
		if (status < 0)
			return status;

2298 2299
		break;
		}
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
	}

	return 0;

out_no_data:
	dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
	return -EINVAL;

out_inval_auth:
	dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
		 data->auth_flavourlen);
	return -EINVAL;

out_no_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
	return -EINVAL;
2316 2317 2318 2319

out_no_client_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
	return -EINVAL;
2320 2321
}

2322 2323 2324
/*
 * Get the superblock for an NFS4 mountpoint
 */
2325 2326
static int nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
D
David Howells 已提交
2327
{
2328
	struct nfs_parsed_mount_data *data;
2329 2330
	struct super_block *s;
	struct nfs_server *server;
2331
	struct nfs_fh *mntfh;
2332
	struct dentry *mntroot;
2333
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2334 2335 2336
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2337 2338 2339 2340 2341 2342
	int error = -ENOMEM;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
2343

2344
	security_init_mnt_opts(&data->lsm_opts);
2345

2346
	/* Validate the mount data */
2347
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
2348 2349
	if (error < 0)
		goto out;
D
David Howells 已提交
2350

2351
	/* Get a volume representation */
2352
	server = nfs4_create_server(data, mntfh);
2353 2354
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2355
		goto out;
D
David Howells 已提交
2356
	}
T
Trond Myklebust 已提交
2357
	sb_mntdata.server = server;
D
David Howells 已提交
2358

2359 2360 2361
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2362
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2363
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2364 2365
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2366
		goto out_free;
2367 2368
	}

2369 2370 2371
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2372 2373 2374 2375
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2376 2377
	}

2378 2379 2380 2381
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}
D
David Howells 已提交
2382

2383
	mntroot = nfs4_get_root(s, mntfh);
2384 2385 2386
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2387
	}
2388

2389
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2390 2391 2392
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2393
	s->s_flags |= MS_ACTIVE;
2394 2395
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2396 2397 2398
	error = 0;

out:
2399 2400 2401 2402 2403 2404 2405
	kfree(data->client_address);
	kfree(data->nfs_server.export_path);
	kfree(data->nfs_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
2406
	return error;
2407

D
David Howells 已提交
2408
out_free:
2409
	nfs_free_server(server);
2410
	goto out;
2411

2412 2413
error_splat_root:
	dput(mntroot);
2414 2415 2416
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2417
	goto out;
D
David Howells 已提交
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
}

static void nfs4_kill_super(struct super_block *sb)
{
	struct nfs_server *server = NFS_SB(sb);

	nfs_return_all_delegations(sb);
	kill_anon_super(sb);

	nfs4_renewd_prepare_shutdown(server);
2428
	nfs_free_server(server);
D
David Howells 已提交
2429 2430 2431
}

/*
2432
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2433
 */
2434 2435 2436
static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
			    const char *dev_name, void *raw_data,
			    struct vfsmount *mnt)
D
David Howells 已提交
2437
{
2438 2439 2440 2441
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2442
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2443 2444 2445
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2446
	int error;
D
David Howells 已提交
2447

2448
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2449

2450 2451 2452 2453 2454
	/* create a new volume representation */
	server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
		goto out_err_noserver;
D
David Howells 已提交
2455
	}
T
Trond Myklebust 已提交
2456
	sb_mntdata.server = server;
D
David Howells 已提交
2457

2458 2459 2460
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2461
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2462
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2463 2464 2465
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2466 2467
	}

2468 2469 2470
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2471 2472 2473 2474
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2475
	}
D
David Howells 已提交
2476

2477 2478 2479 2480
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
	}
D
David Howells 已提交
2481

2482 2483 2484 2485 2486
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2487 2488 2489 2490 2491
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2492

2493 2494 2495 2496
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2497 2498
	security_sb_clone_mnt_opts(data->sb, s);

2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512
	dprintk("<-- nfs4_xdev_get_sb() = 0\n");
	return 0;

out_err_nosb:
	nfs_free_server(server);
out_err_noserver:
	dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
	return error;

error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2513 2514
}

2515 2516 2517 2518 2519 2520
/*
 * 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)
D
David Howells 已提交
2521 2522
{
	struct nfs_clone_mount *data = raw_data;
2523 2524 2525 2526
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2527
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2528 2529 2530
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
	int error;

	dprintk("--> nfs4_referral_get_sb()\n");

	/* create a new volume representation */
	server = nfs4_create_referral_server(data, &mntfh);
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
		goto out_err_noserver;
	}
T
Trond Myklebust 已提交
2541
	sb_mntdata.server = server;
2542

2543 2544 2545
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2546
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2547
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2548 2549 2550 2551 2552 2553 2554 2555
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2556 2557 2558 2559
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2560 2561 2562 2563 2564 2565 2566
	}

	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}

2567
	mntroot = nfs4_get_root(s, &mntfh);
2568 2569 2570 2571
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2572 2573 2574 2575 2576
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2577 2578 2579 2580 2581

	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2582 2583
	security_sb_clone_mnt_opts(data->sb, s);

2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
	dprintk("<-- nfs4_referral_get_sb() = 0\n");
	return 0;

out_err_nosb:
	nfs_free_server(server);
out_err_noserver:
	dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
	return error;

error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2598 2599
}

2600
#endif /* CONFIG_NFS_V4 */