super.c 54.2 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/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_intr, Opt_nointr,
	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" },
	{ Opt_soft, "soft" },
	{ Opt_hard, "hard" },
	{ Opt_intr, "intr" },
	{ Opt_nointr, "nointr" },
	{ 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_userspace, "retry=%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 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,
};

#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,
};
#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 != 3*HZ || showdefaults)
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		seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
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	if (nfss->acregmax != 60*HZ || showdefaults)
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		seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
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	if (nfss->acdirmin != 30*HZ || showdefaults)
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		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
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	if (nfss->acdirmax != 60*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);
	}
531 532
	seq_printf(m, ",proto=%s",
		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
533 534 535 536 537 538 539
	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);

540 541
	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
542
	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
543 544 545 546 547 548 549 550

	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);

562 563 564
	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);
595 596 597 598
	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
601
	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
	 */
612
	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
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613
	if (auth->au_flavor)
614
		seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
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615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647

	/*
	 * 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
648
 * in response to xdev traversals and referrals
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 */
650
static void nfs_umount_begin(struct super_block *sb)
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651
{
652
	struct nfs_server *server = NFS_SB(sb);
T
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653 654 655 656 657 658 659 660 661
	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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}

664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
/*
 * 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;
	}
	}
}

683
/*
684 685 686 687
 * 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.
688 689 690 691 692
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
693
		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
695 696 697 698
	}
	case AF_INET6: {
		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
		return !ipv6_addr_any(sa);
699 700 701 702 703 704
	}
	}

	return 0;
}

705 706 707 708 709 710 711 712 713
/*
 * Parse string addresses passed in via a mount option,
 * and construct a sockaddr based on the result.
 *
 * If address parsing fails, set the sockaddr's address
 * family to AF_UNSPEC to force nfs_verify_server_address()
 * to punt the mount.
 */
static void nfs_parse_server_address(char *value,
714 715
				     struct sockaddr *sap,
				     size_t *len)
716
{
717 718 719
	if (strchr(value, ':')) {
		struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
		u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
720

721 722 723 724 725 726 727 728 729 730 731 732 733
		ap->sin6_family = AF_INET6;
		*len = sizeof(*ap);
		if (in6_pton(value, -1, addr, '\0', NULL))
			return;
	} else {
		struct sockaddr_in *ap = (struct sockaddr_in *)sap;
		u8 *addr = (u8 *)&ap->sin_addr.s_addr;

		ap->sin_family = AF_INET;
		*len = sizeof(*ap);
		if (in4_pton(value, -1, addr, '\0', NULL))
			return;
	}
734 735

	sap->sa_family = AF_UNSPEC;
736
	*len = 0;
737 738
}

739 740 741 742 743 744 745
/*
 * 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)
{
746 747
	char *p, *string, *secdata;
	int rc;
748 749 750 751 752 753 754

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

755 756 757 758 759 760 761 762 763 764 765 766 767 768
	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);

769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	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_intr:
		case Opt_nointr:
			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;
821
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
822 823 824 825 826
			mnt->timeo = 7;
			mnt->retrans = 5;
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
827
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
828 829 830
			mnt->timeo = 600;
			mnt->retrans = 2;
			break;
\
\"Talpey, Thomas\ 已提交
831 832 833 834 835 836
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			mnt->timeo = 600;
			mnt->retrans = 2;
			break;
837 838 839 840 841 842 843 844 845 846 847 848
		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;
849 850 851 852 853 854
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
855 856 857 858 859 860

		case Opt_port:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
861
			mnt->nfs_server.port = option;
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
			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;
			token = match_token(string, nfs_secflavor_tokens, args);
			kfree(string);

			/*
			 * 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.
			 */
			switch (token) {
			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:
				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) {
1026
			case Opt_xprt_udp:
1027
				mnt->flags &= ~NFS_MOUNT_TCP;
1028
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1029 1030 1031
				mnt->timeo = 7;
				mnt->retrans = 5;
				break;
1032
			case Opt_xprt_tcp:
1033
				mnt->flags |= NFS_MOUNT_TCP;
1034
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035 1036 1037
				mnt->timeo = 600;
				mnt->retrans = 2;
				break;
\
\"Talpey, Thomas\ 已提交
1038 1039 1040 1041 1042 1043 1044
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				mnt->timeo = 600;
				mnt->retrans = 2;
				break;
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
			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) {
1058
			case Opt_xprt_udp:
1059
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1060
				break;
1061
			case Opt_xprt_tcp:
1062
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1063
				break;
\
\"Talpey, Thomas\ 已提交
1064
			case Opt_xprt_rdma: /* not used for side protocols */
1065 1066 1067 1068 1069 1070 1071 1072
			default:
				goto out_unrec_xprt;
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1073
			nfs_parse_server_address(string, (struct sockaddr *)
1074 1075
						 &mnt->nfs_server.address,
						 &mnt->nfs_server.addrlen);
1076 1077 1078 1079 1080 1081
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1082
			kfree(mnt->client_address);
1083 1084
			mnt->client_address = string;
			break;
1085 1086 1087 1088
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1089
			kfree(mnt->mount_server.hostname);
1090 1091
			mnt->mount_server.hostname = string;
			break;
1092
		case Opt_mountaddr:
1093 1094 1095
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1096
			nfs_parse_server_address(string, (struct sockaddr *)
1097 1098
						 &mnt->mount_server.address,
						 &mnt->mount_server.addrlen);
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
			kfree(string);
			break;

		case Opt_userspace:
		case Opt_deprecated:
			break;

		default:
			goto out_unknown;
		}
	}

1111 1112
	nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
				mnt->nfs_server.port);
1113

1114 1115 1116 1117 1118
	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1119 1120 1121 1122
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
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;
}

1140 1141 1142 1143 1144 1145 1146
/*
 * 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)
{
1147
	struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1148
	char *hostname;
1149
	int status;
1150 1151 1152 1153 1154 1155 1156 1157

	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;
	}

1158 1159 1160 1161 1162
	if (args->mount_server.hostname)
		hostname = args->mount_server.hostname;
	else
		hostname = args->nfs_server.hostname;

1163 1164 1165
	/*
	 * Construct the mount server's address.
	 */
1166 1167 1168 1169 1170 1171
	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;
	}

1172 1173 1174
	/*
	 * autobind will be used if mount_server.port == 0
	 */
1175
	nfs_set_port(sap, args->mount_server.port);
1176 1177 1178 1179 1180

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1181 1182
	status = nfs_mount(sap,
			   args->mount_server.addrlen,
1183
			   hostname,
1184 1185 1186 1187
			   args->nfs_server.export_path,
			   args->mount_server.version,
			   args->mount_server.protocol,
			   root_fh);
1188 1189
	if (status == 0)
		return 0;
1190

1191 1192
	dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
			hostname, status);
1193 1194 1195
	return status;
}

D
David Howells 已提交
1196
/*
1197 1198
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
 *
 * 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
1211
 */
1212 1213
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1214 1215
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1216
{
1217
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1218

1219 1220
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1221

1222 1223 1224 1225 1226 1227 1228 1229 1230
	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
	args->timeo		= 600;
	args->retrans		= 2;
	args->acregmin		= 3;
	args->acregmax		= 60;
	args->acdirmin		= 30;
	args->acdirmax		= 60;
1231
	args->mount_server.port	= 0;	/* autobind unless user sets port */
1232
	args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1233
	args->nfs_server.port	= 0;	/* autobind unless user sets port */
1234
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1235

1236
	switch (data->version) {
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
	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:
		if (data->flags & NFS_MOUNT_VER3)
			mntfh->size = data->root.size;
		else
			mntfh->size = NFS2_FHSIZE;

		if (mntfh->size > sizeof(mntfh->data))
			goto out_invalid_fh;

		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);
1264

1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
		/*
		 * 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;
1278 1279 1280 1281 1282 1283 1284 1285

		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;

1286
		if (!(data->flags & NFS_MOUNT_TCP))
1287
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1288 1289 1290 1291 1292
		/* 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;
1293 1294
		if (!args->nfs_server.hostname)
			goto out_nomem;
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321

		/*
		 * 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
		}

1322
		break;
1323 1324 1325 1326 1327
	default: {
		unsigned int len;
		char *c;
		int status;

1328 1329
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1330

1331 1332 1333 1334
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1335 1336 1337
		c = strchr(dev_name, ':');
		if (c == NULL)
			return -EINVAL;
1338
		len = c - dev_name;
1339 1340
		/* N.B. caller will free nfs_server.hostname in all cases */
		args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1341 1342
		if (!args->nfs_server.hostname)
			goto out_nomem;
1343 1344 1345

		c++;
		if (strlen(c) > NFS_MAXPATHLEN)
1346
			return -ENAMETOOLONG;
1347
		args->nfs_server.export_path = c;
1348

1349
		status = nfs_try_mount(args, mntfh);
1350
		if (status)
1351
			return status;
1352 1353 1354

		break;
		}
D
David Howells 已提交
1355
	}
1356

1357 1358
	if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
		args->auth_flavors[0] = RPC_AUTH_UNIX;
1359

1360
#ifndef CONFIG_NFS_V3
1361
	if (args->flags & NFS_MOUNT_VER3)
1362 1363
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1364

1365
	return 0;
D
David Howells 已提交
1366

1367 1368 1369
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1370

1371 1372 1373 1374
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
1375

1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
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 */

1386 1387 1388 1389
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1390 1391 1392 1393 1394 1395 1396
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
1397 1398 1399
}

/*
1400
 * Initialise the common bits of the superblock
D
David Howells 已提交
1401
 */
1402
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1403
{
1404
	struct nfs_server *server = NFS_SB(sb);
1405

1406
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1407

1408 1409 1410
	/* 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));
1411

1412 1413 1414
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1415

1416 1417
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1418

1419
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1420 1421 1422
}

/*
1423
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1424
 */
1425 1426
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1427 1428
{
	struct nfs_server *server = NFS_SB(sb);
1429

1430 1431 1432 1433
	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
1434

1435 1436 1437 1438 1439 1440
	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;
1441
	}
1442 1443 1444

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1445 1446 1447
}

/*
1448
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1449
 */
1450 1451
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1452
{
1453 1454 1455 1456 1457
	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
1458 1459

	if (server->flags & NFS_MOUNT_VER3) {
1460 1461
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1462 1463 1464 1465 1466
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1467 1468
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
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
#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
1499
	return 1;
1500
Ebusy:
T
Trond Myklebust 已提交
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
	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;
}

1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
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
1560 1561 1562 1563 1564 1565
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;

1566
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
1567 1568 1569 1570 1571 1572 1573
		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);
1574 1575
}

1576 1577 1578 1579 1580
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

1581 1582
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
1583 1584 1585
{
	struct nfs_server *server = NULL;
	struct super_block *s;
1586 1587
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
1588
	struct dentry *mntroot;
1589
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1590 1591 1592
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1593 1594 1595 1596 1597 1598
	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
1599

1600
	security_init_mnt_opts(&data->lsm_opts);
1601

1602
	/* Validate the mount data */
1603
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1604
	if (error < 0)
1605
		goto out;
D
David Howells 已提交
1606

1607
	/* Get a volume representation */
1608
	server = nfs_create_server(data, mntfh);
1609 1610
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
1611
		goto out;
D
David Howells 已提交
1612
	}
T
Trond Myklebust 已提交
1613
	sb_mntdata.server = server;
D
David Howells 已提交
1614

1615 1616 1617
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

1618
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
1619
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1620 1621
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
1622
		goto out_err_nosb;
1623 1624
	}

1625 1626 1627
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
1628 1629 1630 1631
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
1632
	}
D
David Howells 已提交
1633

1634 1635
	if (!s->s_root) {
		/* initial superblock/root creation */
1636
		nfs_fill_super(s, data);
1637
	}
D
David Howells 已提交
1638

1639
	mntroot = nfs_get_root(s, mntfh);
1640 1641 1642
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
1643
	}
1644

1645
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1646 1647 1648
	if (error)
		goto error_splat_root;

1649 1650 1651
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
1652 1653 1654
	error = 0;

out:
1655 1656 1657 1658 1659 1660
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
1661
	return error;
1662

1663 1664
out_err_nosb:
	nfs_free_server(server);
1665
	goto out;
1666

1667 1668
error_splat_root:
	dput(mntroot);
1669 1670 1671
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
1672
	goto out;
D
David Howells 已提交
1673 1674
}

1675 1676 1677
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
1678 1679 1680 1681
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

1682
	bdi_unregister(&server->backing_dev_info);
D
David Howells 已提交
1683
	kill_anon_super(s);
1684
	nfs_free_server(server);
D
David Howells 已提交
1685 1686
}

1687 1688 1689 1690 1691 1692
/*
 * 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
1693 1694
{
	struct nfs_clone_mount *data = raw_data;
1695 1696 1697
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
1698
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1699 1700 1701
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1702
	int error;
D
David Howells 已提交
1703

1704
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
1705

1706 1707 1708 1709 1710 1711
	/* 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
1712
	sb_mntdata.server = server;
1713

1714 1715 1716
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

1717
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
1718
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1719 1720 1721 1722
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
1723

1724 1725 1726
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
1727 1728 1729 1730
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
1731
	}
1732

1733 1734 1735 1736
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
	}
D
David Howells 已提交
1737

1738 1739 1740 1741
	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
1742
	}
1743
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1744 1745 1746 1747
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
1748

1749 1750 1751
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
1752

1753 1754 1755
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

1756 1757
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
1758

1759 1760 1761 1762 1763
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
1764

1765 1766 1767 1768 1769
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
1770 1771
}

1772 1773
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
1774
/*
1775
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
1776
 */
1777 1778
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1779
{
1780 1781 1782
	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
1783
	sb->s_time_gran = 1;
1784 1785
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1786 1787
}

1788 1789 1790 1791
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
1792
{
1793 1794 1795
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
1796 1797
}

1798 1799 1800
/*
 * Validate NFSv4 mount options
 */
1801 1802 1803
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
1804
{
1805
	struct sockaddr_in *ap;
1806
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1807 1808 1809 1810 1811
	char *c;

	if (data == NULL)
		goto out_no_data;

1812 1813 1814 1815 1816 1817 1818 1819
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
	args->timeo		= 600;
	args->retrans		= 2;
	args->acregmin		= 3;
	args->acregmax		= 60;
	args->acdirmin		= 30;
	args->acdirmax		= 60;
1820
	args->nfs_server.port	= NFS_PORT; /* 2049 unless user set port= */
1821
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1822

1823 1824
	switch (data->version) {
	case 1:
1825 1826 1827 1828
		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)
1829
			goto out_no_address;
1830 1831
		args->nfs_server.addrlen = data->host_addrlen;
		if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1832
			return -EFAULT;
1833 1834
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
1835 1836 1837 1838
			goto out_no_address;

		switch (data->auth_flavourlen) {
		case 0:
1839
			args->auth_flavors[0] = RPC_AUTH_UNIX;
1840 1841
			break;
		case 1:
1842
			if (copy_from_user(&args->auth_flavors[0],
1843
					   data->auth_flavours,
1844
					   sizeof(args->auth_flavors[0])))
1845 1846 1847 1848 1849 1850 1851 1852 1853
				return -EFAULT;
			break;
		default:
			goto out_inval_auth;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
1854
		args->nfs_server.hostname = c;
1855 1856 1857 1858

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
1859 1860
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1861 1862 1863 1864

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
		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;
1882 1883

		break;
1884 1885
	default: {
		unsigned int len;
1886 1887

		if (nfs_parse_mount_options((char *)options, args) == 0)
1888 1889 1890
			return -EINVAL;

		if (!nfs_verify_server_address((struct sockaddr *)
1891
						&args->nfs_server.address))
1892 1893
			return -EINVAL;

1894
		switch (args->auth_flavor_len) {
1895
		case 0:
1896
			args->auth_flavors[0] = RPC_AUTH_UNIX;
1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
			break;
		case 1:
			break;
		default:
			goto out_inval_auth;
		}

		/*
		 * Split "dev_name" into "hostname:mntpath".
		 */
		c = strchr(dev_name, ':');
		if (c == NULL)
			return -EINVAL;
		/* while calculating len, pretend ':' is '\0' */
		len = c - dev_name;
		if (len > NFS4_MAXNAMLEN)
1913
			return -ENAMETOOLONG;
1914 1915
		/* N.B. caller will free nfs_server.hostname in all cases */
		args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1916 1917
		if (!args->nfs_server.hostname)
			goto out_nomem;
1918 1919 1920 1921

		c++;			/* step over the ':' */
		len = strlen(c);
		if (len > NFS4_MAXPATHLEN)
1922
			return -ENAMETOOLONG;
1923
		args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1924 1925
		if (!args->nfs_server.export_path)
			goto out_nomem;
1926

1927
		dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1928

1929
		if (args->client_address == NULL)
1930 1931
			goto out_no_client_address;

1932 1933
		break;
		}
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
	}

	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;

1947 1948 1949 1950
out_nomem:
	dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
	return -ENOMEM;

1951 1952 1953
out_no_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
	return -EINVAL;
1954 1955 1956 1957

out_no_client_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
	return -EINVAL;
1958 1959
}

1960 1961 1962
/*
 * Get the superblock for an NFS4 mountpoint
 */
1963 1964
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
1965
{
1966
	struct nfs_parsed_mount_data *data;
1967 1968
	struct super_block *s;
	struct nfs_server *server;
1969
	struct nfs_fh *mntfh;
1970
	struct dentry *mntroot;
1971
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1972 1973 1974
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1975 1976 1977 1978 1979 1980
	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
1981

1982
	security_init_mnt_opts(&data->lsm_opts);
1983

1984
	/* Validate the mount data */
1985
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
1986 1987
	if (error < 0)
		goto out;
D
David Howells 已提交
1988

1989
	/* Get a volume representation */
1990
	server = nfs4_create_server(data, mntfh);
1991 1992
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
1993
		goto out;
D
David Howells 已提交
1994
	}
T
Trond Myklebust 已提交
1995
	sb_mntdata.server = server;
D
David Howells 已提交
1996

1997 1998 1999
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2000
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2001
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2002 2003
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2004
		goto out_free;
2005 2006
	}

2007 2008 2009
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2010 2011 2012 2013
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2014 2015
	}

2016 2017 2018 2019
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}
D
David Howells 已提交
2020

2021
	mntroot = nfs4_get_root(s, mntfh);
2022 2023 2024
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2025
	}
2026

2027
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2028 2029 2030
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2031
	s->s_flags |= MS_ACTIVE;
2032 2033
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2034 2035 2036
	error = 0;

out:
2037 2038 2039 2040 2041 2042 2043
	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);
2044
	return error;
2045

D
David Howells 已提交
2046
out_free:
2047
	nfs_free_server(server);
2048
	goto out;
2049

2050 2051
error_splat_root:
	dput(mntroot);
2052 2053 2054
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2055
	goto out;
D
David Howells 已提交
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
}

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);
2066
	nfs_free_server(server);
D
David Howells 已提交
2067 2068 2069
}

/*
2070
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2071
 */
2072 2073 2074
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
2075
{
2076 2077 2078 2079
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2080
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2081 2082 2083
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2084
	int error;
D
David Howells 已提交
2085

2086
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2087

2088 2089 2090 2091 2092
	/* 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
2093
	}
T
Trond Myklebust 已提交
2094
	sb_mntdata.server = server;
D
David Howells 已提交
2095

2096 2097 2098
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2099
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2100
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2101 2102 2103
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2104 2105
	}

2106 2107 2108
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2109 2110 2111 2112
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2113
	}
D
David Howells 已提交
2114

2115 2116 2117 2118
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
	}
D
David Howells 已提交
2119

2120 2121 2122 2123 2124
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2125 2126 2127 2128 2129
	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
2130

2131 2132 2133 2134
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2135 2136
	security_sb_clone_mnt_opts(data->sb, s);

2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
	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
2151 2152
}

2153 2154 2155 2156 2157 2158
/*
 * 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
2159 2160
{
	struct nfs_clone_mount *data = raw_data;
2161 2162 2163 2164
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2165
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2166 2167 2168
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2169 2170 2171 2172 2173 2174 2175 2176 2177 2178
	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
2179
	sb_mntdata.server = server;
2180

2181 2182 2183
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2184
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2185
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2186 2187 2188 2189 2190 2191 2192 2193
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2194 2195 2196 2197
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2198 2199 2200 2201 2202 2203 2204
	}

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

2205
	mntroot = nfs4_get_root(s, &mntfh);
2206 2207 2208 2209
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2210 2211 2212 2213 2214
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2215 2216 2217 2218 2219

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

2220 2221
	security_sb_clone_mnt_opts(data->sb, s);

2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
	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
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}

2238
#endif /* CONFIG_NFS_V4 */