super.c 62.1 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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	/* Mount options that are ignored */
	Opt_userspace, Opt_deprecated,

	Opt_err
};

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

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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_err, NULL }
};

enum {
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	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
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	Opt_xprt_err
};

static match_table_t nfs_xprt_protocol_tokens = {
	{ 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
};

static match_table_t nfs_secflavor_tokens = {
	{ 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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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 void nfs_put_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,
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	.put_super	= nfs_put_super,
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	.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 nfs_server *server)
{
	atomic_inc(&server->active);
}

void nfs_sb_deactive(struct nfs_server *server)
{
	if (atomic_dec_and_test(&server->active))
		wake_up(&server->active_wq);
}

static void nfs_put_super(struct super_block *sb)
{
	struct nfs_server *server = NFS_SB(sb);
	/*
	 * Make sure there are no outstanding ops to this server.
	 * If so, wait for them to finish before allowing the
	 * unmount to continue.
	 */
	wait_event(server->active_wq, atomic_read(&server->active) == 0);
}

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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;

	lock_kernel();

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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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	unlock_kernel();
	return 0;

 out_err:
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	dprintk("%s: statfs error = %d\n", __func__, -error);
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	unlock_kernel();
	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);
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	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
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		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);
	}
535 536
	seq_printf(m, ",proto=%s",
		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
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	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);

544 545
	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
546
	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
547 548 549 550 551 552 553 554

	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);

566 567 568
	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);
599 600 601 602
	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
605
	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
	 */
616
	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
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	if (auth->au_flavor)
618
		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
652
 * in response to xdev traversals and referrals
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 */
654
static void nfs_umount_begin(struct super_block *sb)
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{
656
	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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}

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/*
 * Set the port number in an address.  Be agnostic about the address family.
 */
static void nfs_set_port(struct sockaddr *sap, unsigned short port)
{
	switch (sap->sa_family) {
	case AF_INET: {
		struct sockaddr_in *ap = (struct sockaddr_in *)sap;
		ap->sin_port = htons(port);
		break;
	}
	case AF_INET6: {
		struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
		ap->sin6_port = htons(port);
		break;
	}
	}
}

687
/*
688 689 690 691
 * 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.
692 693 694 695 696
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
697
		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
699 700 701 702
	}
	case AF_INET6: {
		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
		return !ipv6_addr_any(sa);
703 704 705 706 707 708
	}
	}

	return 0;
}

709 710
static void nfs_parse_ipv4_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
711
{
712 713
	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
	u8 *addr = (u8 *)&sin->sin_addr.s_addr;
714

715 716 717 718 719 720 721
	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))
722
			return;
723 724 725 726 727 728
	}

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

729 730
#define IPV6_SCOPE_DELIMITER	'%'

731
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
				    const char *delim,
				    struct sockaddr_in6 *sin6)
{
	char *p;
	size_t len;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return ;
	if (*delim != IPV6_SCOPE_DELIMITER)
		return;

	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 {
			/* scope_id is set to zero on error */
			strict_strtoul(p, 10, &scope_id);
		}

		kfree(p);
		sin6->sin6_scope_id = scope_id;
		dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
	}
}

765 766 767 768 769
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;
770
	const char *delim;
771 772 773 774

	if (str_len <= INET6_ADDRSTRLEN) {
		dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
				(int)str_len, string);
775

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

	sap->sa_family = AF_UNSPEC;
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
	*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.
 */
static void nfs_parse_ip_address(char *string, size_t str_len,
				 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;
	}
}

856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
/*
 * Parse the value of the 'sec=' option.
 *
 * The flags setting is for v2/v3.  The flavor_len setting is for v4.
 * v2/v3 also need to know the difference between NULL and UNIX.
 */
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->flags &= ~NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 0;
		mnt->auth_flavors[0] = RPC_AUTH_NULL;
		break;
	case Opt_sec_sys:
		mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 0;
		mnt->auth_flavors[0] = RPC_AUTH_UNIX;
		break;
	case Opt_sec_krb5:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
		break;
	case Opt_sec_krb5i:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
		break;
	case Opt_sec_krb5p:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
		break;
	case Opt_sec_lkey:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
		break;
	case Opt_sec_lkeyi:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
		break;
	case Opt_sec_lkeyp:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
		break;
	case Opt_sec_spkm:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
		break;
	case Opt_sec_spkmi:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
		break;
	case Opt_sec_spkmp:
		mnt->flags |= NFS_MOUNT_SECFLAVOUR;
		mnt->auth_flavor_len = 1;
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
		break;
	default:
		return 0;
	}

	return 1;
}

932 933 934 935 936 937 938
/*
 * Error-check and convert a string of mount options from user space into
 * a data structure
 */
static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
939 940
	char *p, *string, *secdata;
	int rc;
941 942 943 944 945 946 947

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

948 949 950 951 952 953 954 955 956 957 958 959 960 961
	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);

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	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) {
		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;
1011
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1012 1013 1014
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
1015
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1016
			break;
\
\"Talpey, Thomas\ 已提交
1017 1018 1019 1020
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			break;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
		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;
1033 1034 1035 1036 1037 1038
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
1039 1040 1041 1042 1043 1044

		case Opt_port:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
1045
			mnt->nfs_server.port = option;
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
			break;
		case Opt_rsize:
			if (match_int(args, &mnt->rsize))
				return 0;
			break;
		case Opt_wsize:
			if (match_int(args, &mnt->wsize))
				return 0;
			break;
		case Opt_bsize:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->bsize = option;
			break;
		case Opt_timeo:
			if (match_int(args, &mnt->timeo))
				return 0;
			break;
		case Opt_retrans:
			if (match_int(args, &mnt->retrans))
				return 0;
			break;
		case Opt_acregmin:
			if (match_int(args, &mnt->acregmin))
				return 0;
			break;
		case Opt_acregmax:
			if (match_int(args, &mnt->acregmax))
				return 0;
			break;
		case Opt_acdirmin:
			if (match_int(args, &mnt->acdirmin))
				return 0;
			break;
		case Opt_acdirmax:
			if (match_int(args, &mnt->acdirmax))
				return 0;
			break;
		case Opt_actimeo:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->acregmin =
			mnt->acregmax =
			mnt->acdirmin =
			mnt->acdirmax = option;
			break;
		case Opt_namelen:
			if (match_int(args, &mnt->namlen))
				return 0;
			break;
		case Opt_mountport:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
			mnt->mount_server.port = option;
			break;
		case Opt_mountvers:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->mount_server.version = option;
			break;
		case Opt_nfsvers:
			if (match_int(args, &option))
				return 0;
			switch (option) {
			case 2:
				mnt->flags &= ~NFS_MOUNT_VER3;
				break;
			case 3:
				mnt->flags |= NFS_MOUNT_VER3;
				break;
			default:
				goto out_unrec_vers;
			}
			break;

		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1133
			rc = nfs_parse_security_flavors(string, mnt);
1134
			kfree(string);
1135
			if (!rc)
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
				goto out_unrec_sec;
			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) {
1147
			case Opt_xprt_udp:
1148
				mnt->flags &= ~NFS_MOUNT_TCP;
1149
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1150
				break;
1151
			case Opt_xprt_tcp:
1152
				mnt->flags |= NFS_MOUNT_TCP;
1153
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1154
				break;
\
\"Talpey, Thomas\ 已提交
1155 1156 1157 1158 1159
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				break;
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
			default:
				goto out_unrec_xprt;
			}
			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) {
1173
			case Opt_xprt_udp:
1174
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1175
				break;
1176
			case Opt_xprt_tcp:
1177
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1178
				break;
\
\"Talpey, Thomas\ 已提交
1179
			case Opt_xprt_rdma: /* not used for side protocols */
1180 1181 1182 1183 1184 1185 1186 1187
			default:
				goto out_unrec_xprt;
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1188 1189 1190 1191
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->nfs_server.address,
					     &mnt->nfs_server.addrlen);
1192 1193 1194 1195 1196 1197
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1198
			kfree(mnt->client_address);
1199 1200
			mnt->client_address = string;
			break;
1201 1202 1203 1204
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1205
			kfree(mnt->mount_server.hostname);
1206 1207
			mnt->mount_server.hostname = string;
			break;
1208
		case Opt_mountaddr:
1209 1210 1211
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1212 1213 1214 1215
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->mount_server.address,
					     &mnt->mount_server.addrlen);
1216 1217 1218 1219 1220
			kfree(string);
			break;

		case Opt_userspace:
		case Opt_deprecated:
1221 1222
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
			break;

		default:
			goto out_unknown;
		}
	}

	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1235 1236 1237 1238
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
out_unrec_vers:
	printk(KERN_INFO "NFS: unrecognized NFS version number\n");
	return 0;

out_unrec_xprt:
	printk(KERN_INFO "NFS: unrecognized transport protocol\n");
	return 0;

out_unrec_sec:
	printk(KERN_INFO "NFS: unrecognized security flavor\n");
	return 0;

out_unknown:
	printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
	return 0;
}

1256 1257 1258 1259 1260 1261 1262
/*
 * 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)
{
1263
	struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1264
	char *hostname;
1265
	int status;
1266 1267 1268 1269 1270 1271 1272 1273

	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;
	}

1274 1275 1276 1277 1278
	if (args->mount_server.hostname)
		hostname = args->mount_server.hostname;
	else
		hostname = args->nfs_server.hostname;

1279 1280 1281
	/*
	 * Construct the mount server's address.
	 */
1282 1283 1284 1285 1286 1287
	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;
	}

1288 1289 1290
	/*
	 * autobind will be used if mount_server.port == 0
	 */
1291
	nfs_set_port(sap, args->mount_server.port);
1292 1293 1294 1295 1296

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1297 1298
	status = nfs_mount(sap,
			   args->mount_server.addrlen,
1299
			   hostname,
1300 1301 1302 1303
			   args->nfs_server.export_path,
			   args->mount_server.version,
			   args->mount_server.protocol,
			   root_fh);
1304 1305
	if (status == 0)
		return 0;
1306

1307
	dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1308
			hostname, status);
1309 1310 1311
	return status;
}

1312 1313 1314
static int nfs_parse_simple_hostname(const char *dev_name,
				     char **hostname, size_t maxnamlen,
				     char **export_path, size_t maxpathlen)
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
{
	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;
}

1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 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 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
/*
 * 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
1447
/*
1448 1449
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
 *
 * 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
1462
 */
1463 1464
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1465 1466
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1467
{
1468
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1469

1470 1471
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1472

1473 1474 1475
	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
1476 1477 1478 1479
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
1480 1481
	args->mount_server.port	= 0;	/* autobind unless user sets port */
	args->nfs_server.port	= 0;	/* autobind unless user sets port */
1482
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1483

1484
	switch (data->version) {
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
	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:
1500 1501 1502
		if (data->flags & NFS_MOUNT_VER3) {
			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
				goto out_invalid_fh;
1503
			mntfh->size = data->root.size;
1504
		} else
1505 1506 1507 1508 1509 1510 1511
			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);
1512

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
		/*
		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
		 * can deal with.
		 */
		args->flags		= data->flags;
		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;
1526 1527 1528 1529 1530 1531 1532 1533

		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;

1534
		if (!(data->flags & NFS_MOUNT_TCP))
1535
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1536 1537 1538 1539 1540
		/* 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;
		args->auth_flavors[0]	= data->pseudoflavor;
1541 1542
		if (!args->nfs_server.hostname)
			goto out_nomem;
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569

		/*
		 * 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
		}

1570
		break;
1571 1572 1573
	default: {
		int status;

1574 1575
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1576

1577 1578 1579 1580
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1581 1582 1583
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

1584 1585
		nfs_set_mount_transport_protocol(args);

1586 1587 1588 1589 1590 1591 1592
		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);
1593

1594 1595
		kfree(args->nfs_server.export_path);
		args->nfs_server.export_path = NULL;
1596 1597

		if (status)
1598
			return status;
1599 1600 1601

		break;
		}
D
David Howells 已提交
1602
	}
1603

1604 1605
	if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
		args->auth_flavors[0] = RPC_AUTH_UNIX;
1606

1607
#ifndef CONFIG_NFS_V3
1608
	if (args->flags & NFS_MOUNT_VER3)
1609 1610
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1611

1612
	return 0;
D
David Howells 已提交
1613

1614 1615 1616
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1617

1618 1619 1620 1621
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
1622

1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
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 */

1633 1634 1635 1636
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1637 1638 1639 1640 1641 1642 1643
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
1644 1645
}

1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
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;
1676
	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1677 1678 1679 1680 1681 1682 1683

	/*
	 * 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.
	 */
1684 1685
	if ((nfsvers == 4 && options4->version == 1) ||
	    (nfsvers <= 3 && options->version >= 1 &&
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
	     options->version <= 6))
		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
1720
/*
1721
 * Initialise the common bits of the superblock
D
David Howells 已提交
1722
 */
1723
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1724
{
1725
	struct nfs_server *server = NFS_SB(sb);
1726

1727
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1728

1729 1730 1731
	/* 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));
1732

1733 1734 1735
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1736

1737 1738
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1739

1740
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1741 1742 1743
}

/*
1744
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1745
 */
1746 1747
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1748 1749
{
	struct nfs_server *server = NFS_SB(sb);
1750

1751 1752 1753 1754
	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
1755

1756 1757 1758 1759 1760 1761
	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;
1762
	}
1763 1764 1765

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1766 1767 1768
}

/*
1769
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1770
 */
1771 1772
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1773
{
1774 1775 1776 1777 1778
	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
1779 1780

	if (server->flags & NFS_MOUNT_VER3) {
1781 1782
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1783 1784 1785 1786 1787
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1788 1789
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1790 1791
}

1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
#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
1820
	return 1;
1821
Ebusy:
T
Trond Myklebust 已提交
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
	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;
}

1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
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
1881 1882 1883 1884 1885 1886
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;

1887
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
1888 1889 1890 1891 1892 1893 1894
		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);
1895 1896
}

1897 1898 1899 1900 1901
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

1902 1903
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
1904 1905 1906
{
	struct nfs_server *server = NULL;
	struct super_block *s;
1907 1908
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
1909
	struct dentry *mntroot;
1910
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1911 1912 1913
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1914 1915 1916 1917 1918 1919
	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
1920

1921
	security_init_mnt_opts(&data->lsm_opts);
1922

1923
	/* Validate the mount data */
1924
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1925
	if (error < 0)
1926
		goto out;
D
David Howells 已提交
1927

1928
	/* Get a volume representation */
1929
	server = nfs_create_server(data, mntfh);
1930 1931
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
1932
		goto out;
D
David Howells 已提交
1933
	}
T
Trond Myklebust 已提交
1934
	sb_mntdata.server = server;
D
David Howells 已提交
1935

1936 1937 1938
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

1939
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
1940
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1941 1942
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
1943
		goto out_err_nosb;
1944 1945
	}

1946 1947 1948
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
1949 1950 1951 1952
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
1953
	}
D
David Howells 已提交
1954

1955 1956
	if (!s->s_root) {
		/* initial superblock/root creation */
1957
		nfs_fill_super(s, data);
1958
	}
D
David Howells 已提交
1959

1960
	mntroot = nfs_get_root(s, mntfh);
1961 1962 1963
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
1964
	}
1965

1966
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1967 1968 1969
	if (error)
		goto error_splat_root;

1970 1971 1972
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
1973 1974 1975
	error = 0;

out:
1976 1977 1978 1979 1980 1981
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
1982
	return error;
1983

1984 1985
out_err_nosb:
	nfs_free_server(server);
1986
	goto out;
1987

1988 1989
error_splat_root:
	dput(mntroot);
1990 1991 1992
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
1993
	goto out;
D
David Howells 已提交
1994 1995
}

1996 1997 1998
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
1999 2000 2001 2002
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

2003
	bdi_unregister(&server->backing_dev_info);
D
David Howells 已提交
2004
	kill_anon_super(s);
2005
	nfs_free_server(server);
D
David Howells 已提交
2006 2007
}

2008 2009 2010 2011 2012 2013
/*
 * 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
2014 2015
{
	struct nfs_clone_mount *data = raw_data;
2016 2017 2018
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2019
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2020 2021 2022
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2023
	int error;
D
David Howells 已提交
2024

2025
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
2026

2027 2028 2029 2030 2031 2032
	/* 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
2033
	sb_mntdata.server = server;
2034

2035 2036 2037
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2038
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2039
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2040 2041 2042 2043
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
2044

2045 2046 2047
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2048 2049 2050 2051
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
2052
	}
2053

2054 2055 2056 2057
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
	}
D
David Howells 已提交
2058

2059 2060 2061 2062
	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
2063
	}
2064
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2065 2066 2067 2068
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2069

2070 2071 2072
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
2073

2074 2075 2076
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

2077 2078
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
2079

2080 2081 2082 2083 2084
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
2085

2086 2087 2088 2089 2090
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
2091 2092
}

2093 2094
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
2095
/*
2096
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
2097
 */
2098 2099
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
2100
{
2101 2102 2103
	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
2104
	sb->s_time_gran = 1;
2105 2106
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
2107 2108
}

2109 2110 2111 2112
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
2113
{
2114 2115 2116
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
2117 2118
}

2119 2120 2121
/*
 * Validate NFSv4 mount options
 */
2122 2123 2124
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
2125
{
2126
	struct sockaddr_in *ap;
2127
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2128 2129 2130 2131 2132
	char *c;

	if (data == NULL)
		goto out_no_data;

2133 2134
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
2135 2136 2137 2138
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
2139
	args->nfs_server.port	= NFS_PORT; /* 2049 unless user set port= */
2140

2141 2142
	switch (data->version) {
	case 1:
2143 2144 2145 2146
		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)
2147
			goto out_no_address;
2148 2149
		args->nfs_server.addrlen = data->host_addrlen;
		if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2150
			return -EFAULT;
2151 2152
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
2153 2154 2155 2156
			goto out_no_address;

		switch (data->auth_flavourlen) {
		case 0:
2157
			args->auth_flavors[0] = RPC_AUTH_UNIX;
2158 2159
			break;
		case 1:
2160
			if (copy_from_user(&args->auth_flavors[0],
2161
					   data->auth_flavours,
2162
					   sizeof(args->auth_flavors[0])))
2163 2164 2165 2166 2167 2168 2169 2170 2171
				return -EFAULT;
			break;
		default:
			goto out_inval_auth;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2172
		args->nfs_server.hostname = c;
2173 2174 2175 2176

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2177 2178
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2179 2180 2181 2182

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199
		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;
2200
		nfs_validate_transport_protocol(args);
2201 2202

		break;
2203
	default: {
2204
		int status;
2205 2206

		if (nfs_parse_mount_options((char *)options, args) == 0)
2207 2208 2209
			return -EINVAL;

		if (!nfs_verify_server_address((struct sockaddr *)
2210
						&args->nfs_server.address))
2211 2212
			return -EINVAL;

2213 2214 2215
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

2216 2217
		nfs_validate_transport_protocol(args);

2218
		switch (args->auth_flavor_len) {
2219
		case 0:
2220
			args->auth_flavors[0] = RPC_AUTH_UNIX;
2221 2222 2223 2224 2225 2226 2227
			break;
		case 1:
			break;
		default:
			goto out_inval_auth;
		}

2228
		if (args->client_address == NULL)
2229 2230
			goto out_no_client_address;

2231 2232 2233 2234 2235 2236 2237 2238
		status = nfs_parse_devname(dev_name,
					   &args->nfs_server.hostname,
					   NFS4_MAXNAMLEN,
					   &args->nfs_server.export_path,
					   NFS4_MAXPATHLEN);
		if (status < 0)
			return status;

2239 2240
		break;
		}
2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256
	}

	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;
2257 2258 2259 2260

out_no_client_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
	return -EINVAL;
2261 2262
}

2263 2264 2265
/*
 * Get the superblock for an NFS4 mountpoint
 */
2266 2267
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
2268
{
2269
	struct nfs_parsed_mount_data *data;
2270 2271
	struct super_block *s;
	struct nfs_server *server;
2272
	struct nfs_fh *mntfh;
2273
	struct dentry *mntroot;
2274
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2275 2276 2277
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2278 2279 2280 2281 2282 2283
	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
2284

2285
	security_init_mnt_opts(&data->lsm_opts);
2286

2287
	/* Validate the mount data */
2288
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
2289 2290
	if (error < 0)
		goto out;
D
David Howells 已提交
2291

2292
	/* Get a volume representation */
2293
	server = nfs4_create_server(data, mntfh);
2294 2295
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2296
		goto out;
D
David Howells 已提交
2297
	}
T
Trond Myklebust 已提交
2298
	sb_mntdata.server = server;
D
David Howells 已提交
2299

2300 2301 2302
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2303
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2304
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2305 2306
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2307
		goto out_free;
2308 2309
	}

2310 2311 2312
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2313 2314 2315 2316
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2317 2318
	}

2319 2320 2321 2322
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}
D
David Howells 已提交
2323

2324
	mntroot = nfs4_get_root(s, mntfh);
2325 2326 2327
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2328
	}
2329

2330
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2331 2332 2333
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2334
	s->s_flags |= MS_ACTIVE;
2335 2336
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2337 2338 2339
	error = 0;

out:
2340 2341 2342 2343 2344 2345 2346
	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);
2347
	return error;
2348

D
David Howells 已提交
2349
out_free:
2350
	nfs_free_server(server);
2351
	goto out;
2352

2353 2354
error_splat_root:
	dput(mntroot);
2355 2356 2357
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2358
	goto out;
D
David Howells 已提交
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
}

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);
2369
	nfs_free_server(server);
D
David Howells 已提交
2370 2371 2372
}

/*
2373
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2374
 */
2375 2376 2377
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
2378
{
2379 2380 2381 2382
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2383
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2384 2385 2386
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2387
	int error;
D
David Howells 已提交
2388

2389
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2390

2391 2392 2393 2394 2395
	/* 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
2396
	}
T
Trond Myklebust 已提交
2397
	sb_mntdata.server = server;
D
David Howells 已提交
2398

2399 2400 2401
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2402
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2403
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2404 2405 2406
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2407 2408
	}

2409 2410 2411
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2412 2413 2414 2415
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2416
	}
D
David Howells 已提交
2417

2418 2419 2420 2421
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
	}
D
David Howells 已提交
2422

2423 2424 2425 2426 2427
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2428 2429 2430 2431 2432
	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
2433

2434 2435 2436 2437
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2438 2439
	security_sb_clone_mnt_opts(data->sb, s);

2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453
	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
2454 2455
}

2456 2457 2458 2459 2460 2461
/*
 * 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
2462 2463
{
	struct nfs_clone_mount *data = raw_data;
2464 2465 2466 2467
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2468
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2469 2470 2471
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2472 2473 2474 2475 2476 2477 2478 2479 2480 2481
	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
2482
	sb_mntdata.server = server;
2483

2484 2485 2486
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2487
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2488
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2489 2490 2491 2492 2493 2494 2495 2496
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2497 2498 2499 2500
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2501 2502 2503 2504 2505 2506 2507
	}

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

2508
	mntroot = nfs4_get_root(s, &mntfh);
2509 2510 2511 2512
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2513 2514 2515 2516 2517
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2518 2519 2520 2521 2522

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

2523 2524
	security_sb_clone_mnt_opts(data->sb, s);

2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
	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
2539 2540
}

2541
#endif /* CONFIG_NFS_V4 */