super.c 61.5 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
/*
 * Parse the value of the 'sec=' option.
 *
859
 * The flavor_len setting is for v4 mounts.
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
 */
static int nfs_parse_security_flavors(char *value,
				      struct nfs_parsed_mount_data *mnt)
{
	substring_t args[MAX_OPT_ARGS];

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

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

	return 1;
}

920 921 922 923 924 925 926
/*
 * 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)
{
927 928
	char *p, *string, *secdata;
	int rc;
929 930 931 932 933 934 935

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

936 937 938 939 940 941 942 943 944 945 946 947 948 949
	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);

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
	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;
999
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1000 1001 1002
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
1003
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1004
			break;
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		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			break;
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
		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;
1021 1022 1023 1024 1025 1026
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
1027 1028 1029 1030 1031 1032

		case Opt_port:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
1033
			mnt->nfs_server.port = option;
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 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
			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;
1121
			rc = nfs_parse_security_flavors(string, mnt);
1122
			kfree(string);
1123
			if (!rc)
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
				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) {
1135
			case Opt_xprt_udp:
1136
				mnt->flags &= ~NFS_MOUNT_TCP;
1137
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1138
				break;
1139
			case Opt_xprt_tcp:
1140
				mnt->flags |= NFS_MOUNT_TCP;
1141
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1142
				break;
\
\"Talpey, Thomas\ 已提交
1143 1144 1145 1146 1147
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				break;
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
			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) {
1161
			case Opt_xprt_udp:
1162
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1163
				break;
1164
			case Opt_xprt_tcp:
1165
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1166
				break;
\
\"Talpey, Thomas\ 已提交
1167
			case Opt_xprt_rdma: /* not used for side protocols */
1168 1169 1170 1171 1172 1173 1174 1175
			default:
				goto out_unrec_xprt;
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1176 1177 1178 1179
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->nfs_server.address,
					     &mnt->nfs_server.addrlen);
1180 1181 1182 1183 1184 1185
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1186
			kfree(mnt->client_address);
1187 1188
			mnt->client_address = string;
			break;
1189 1190 1191 1192
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1193
			kfree(mnt->mount_server.hostname);
1194 1195
			mnt->mount_server.hostname = string;
			break;
1196
		case Opt_mountaddr:
1197 1198 1199
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1200 1201 1202 1203
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->mount_server.address,
					     &mnt->mount_server.addrlen);
1204 1205 1206 1207 1208
			kfree(string);
			break;

		case Opt_userspace:
		case Opt_deprecated:
1209 1210
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
			break;

		default:
			goto out_unknown;
		}
	}

	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1223 1224 1225 1226
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
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;
}

1244 1245 1246 1247 1248 1249 1250
/*
 * 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)
{
1251
	struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1252
	char *hostname;
1253
	int status;
1254 1255 1256 1257 1258 1259 1260 1261

	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;
	}

1262 1263 1264 1265 1266
	if (args->mount_server.hostname)
		hostname = args->mount_server.hostname;
	else
		hostname = args->nfs_server.hostname;

1267 1268 1269
	/*
	 * Construct the mount server's address.
	 */
1270 1271 1272 1273 1274 1275
	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;
	}

1276 1277 1278
	/*
	 * autobind will be used if mount_server.port == 0
	 */
1279
	nfs_set_port(sap, args->mount_server.port);
1280 1281 1282 1283 1284

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1285 1286
	status = nfs_mount(sap,
			   args->mount_server.addrlen,
1287
			   hostname,
1288 1289 1290 1291
			   args->nfs_server.export_path,
			   args->mount_server.version,
			   args->mount_server.protocol,
			   root_fh);
1292 1293
	if (status == 0)
		return 0;
1294

1295
	dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1296
			hostname, status);
1297 1298 1299
	return status;
}

1300 1301 1302
static int nfs_parse_simple_hostname(const char *dev_name,
				     char **hostname, size_t maxnamlen,
				     char **export_path, size_t maxpathlen)
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 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
{
	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;
}

1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 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
/*
 * 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
1435
/*
1436 1437
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
 *
 * 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
1450
 */
1451 1452
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1453 1454
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1455
{
1456
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1457

1458 1459
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1460

1461 1462 1463
	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
1464 1465 1466 1467
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
1468 1469
	args->mount_server.port	= 0;	/* autobind unless user sets port */
	args->nfs_server.port	= 0;	/* autobind unless user sets port */
1470
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1471
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
1472

1473
	switch (data->version) {
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488
	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:
1489 1490 1491
		if (data->flags & NFS_MOUNT_VER3) {
			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
				goto out_invalid_fh;
1492
			mntfh->size = data->root.size;
1493
		} else
1494 1495 1496 1497 1498 1499 1500
			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);
1501

1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
		/*
		 * 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;
1515 1516 1517 1518 1519 1520 1521 1522

		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;

1523
		if (!(data->flags & NFS_MOUNT_TCP))
1524
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1525 1526 1527 1528
		/* 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;
1529 1530 1531

		if (data->flags & NFS_MOUNT_SECFLAVOUR)
			args->auth_flavors[0] = data->pseudoflavor;
1532 1533
		if (!args->nfs_server.hostname)
			goto out_nomem;
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 1560

		/*
		 * 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
		}

1561
		break;
1562 1563 1564
	default: {
		int status;

1565 1566
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1567

1568 1569 1570 1571
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1572 1573 1574
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

1575 1576
		nfs_set_mount_transport_protocol(args);

1577 1578 1579 1580 1581 1582 1583
		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);
1584

1585 1586
		kfree(args->nfs_server.export_path);
		args->nfs_server.export_path = NULL;
1587 1588

		if (status)
1589
			return status;
1590 1591 1592

		break;
		}
D
David Howells 已提交
1593
	}
1594 1595

#ifndef CONFIG_NFS_V3
1596
	if (args->flags & NFS_MOUNT_VER3)
1597 1598
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1599

1600
	return 0;
D
David Howells 已提交
1601

1602 1603 1604
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1605

1606 1607 1608 1609
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
1610

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
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 */

1621 1622 1623 1624
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1625 1626 1627 1628 1629 1630 1631
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
1632 1633
}

1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
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;
1664
	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1665 1666 1667 1668 1669 1670 1671

	/*
	 * 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.
	 */
1672 1673
	if ((nfsvers == 4 && options4->version == 1) ||
	    (nfsvers <= 3 && options->version >= 1 &&
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
	     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
1708
/*
1709
 * Initialise the common bits of the superblock
D
David Howells 已提交
1710
 */
1711
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1712
{
1713
	struct nfs_server *server = NFS_SB(sb);
1714

1715
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1716

1717 1718 1719
	/* 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));
1720

1721 1722 1723
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1724

1725 1726
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1727

1728
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1729 1730 1731
}

/*
1732
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1733
 */
1734 1735
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1736 1737
{
	struct nfs_server *server = NFS_SB(sb);
1738

1739 1740 1741 1742
	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
1743

1744 1745 1746 1747 1748 1749
	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;
1750
	}
1751 1752 1753

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1754 1755 1756
}

/*
1757
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1758
 */
1759 1760
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1761
{
1762 1763 1764 1765 1766
	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
1767 1768

	if (server->flags & NFS_MOUNT_VER3) {
1769 1770
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1771 1772 1773 1774 1775
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1776 1777
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1778 1779
}

1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
#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
1808
	return 1;
1809
Ebusy:
T
Trond Myklebust 已提交
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
	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;
}

1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 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
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
1869 1870 1871 1872 1873 1874
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;

1875
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
1876 1877 1878 1879 1880 1881 1882
		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);
1883 1884
}

1885 1886 1887 1888 1889
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

1890 1891
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
1892 1893 1894
{
	struct nfs_server *server = NULL;
	struct super_block *s;
1895 1896
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
1897
	struct dentry *mntroot;
1898
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1899 1900 1901
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1902 1903 1904 1905 1906 1907
	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
1908

1909
	security_init_mnt_opts(&data->lsm_opts);
1910

1911
	/* Validate the mount data */
1912
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1913
	if (error < 0)
1914
		goto out;
D
David Howells 已提交
1915

1916
	/* Get a volume representation */
1917
	server = nfs_create_server(data, mntfh);
1918 1919
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
1920
		goto out;
D
David Howells 已提交
1921
	}
T
Trond Myklebust 已提交
1922
	sb_mntdata.server = server;
D
David Howells 已提交
1923

1924 1925 1926
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

1927
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
1928
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1929 1930
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
1931
		goto out_err_nosb;
1932 1933
	}

1934 1935 1936
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
1937 1938 1939 1940
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
1941
	}
D
David Howells 已提交
1942

1943 1944
	if (!s->s_root) {
		/* initial superblock/root creation */
1945
		nfs_fill_super(s, data);
1946
	}
D
David Howells 已提交
1947

1948
	mntroot = nfs_get_root(s, mntfh);
1949 1950 1951
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
1952
	}
1953

1954
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1955 1956 1957
	if (error)
		goto error_splat_root;

1958 1959 1960
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
1961 1962 1963
	error = 0;

out:
1964 1965 1966 1967 1968 1969
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
1970
	return error;
1971

1972 1973
out_err_nosb:
	nfs_free_server(server);
1974
	goto out;
1975

1976 1977
error_splat_root:
	dput(mntroot);
1978 1979 1980
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
1981
	goto out;
D
David Howells 已提交
1982 1983
}

1984 1985 1986
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
1987 1988 1989 1990
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

1991
	bdi_unregister(&server->backing_dev_info);
D
David Howells 已提交
1992
	kill_anon_super(s);
1993
	nfs_free_server(server);
D
David Howells 已提交
1994 1995
}

1996 1997 1998 1999 2000 2001
/*
 * 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
2002 2003
{
	struct nfs_clone_mount *data = raw_data;
2004 2005 2006
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2007
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2008 2009 2010
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2011
	int error;
D
David Howells 已提交
2012

2013
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
2014

2015 2016 2017 2018 2019 2020
	/* 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
2021
	sb_mntdata.server = server;
2022

2023 2024 2025
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2026
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2027
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2028 2029 2030 2031
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
2032

2033 2034 2035
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2036 2037 2038 2039
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
2040
	}
2041

2042 2043 2044 2045
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
	}
D
David Howells 已提交
2046

2047 2048 2049 2050
	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
2051
	}
2052
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2053 2054 2055 2056
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2057

2058 2059 2060
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
2061

2062 2063 2064
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

2065 2066
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
2067

2068 2069 2070 2071 2072
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
2073

2074 2075 2076 2077 2078
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
2079 2080
}

2081 2082
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
2083
/*
2084
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
2085
 */
2086 2087
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
2088
{
2089 2090 2091
	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
2092
	sb->s_time_gran = 1;
2093 2094
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
2095 2096
}

2097 2098 2099 2100
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
2101
{
2102 2103 2104
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
2105 2106
}

2107 2108 2109
/*
 * Validate NFSv4 mount options
 */
2110 2111 2112
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
2113
{
2114
	struct sockaddr_in *ap;
2115
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2116 2117 2118 2119 2120
	char *c;

	if (data == NULL)
		goto out_no_data;

2121 2122
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
2123 2124 2125 2126
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
2127
	args->nfs_server.port	= NFS_PORT; /* 2049 unless user set port= */
2128 2129
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
	args->auth_flavor_len	= 0;
2130

2131 2132
	switch (data->version) {
	case 1:
2133 2134 2135 2136
		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)
2137
			goto out_no_address;
2138 2139
		args->nfs_server.addrlen = data->host_addrlen;
		if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2140
			return -EFAULT;
2141 2142
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
2143 2144
			goto out_no_address;

2145 2146 2147
		if (data->auth_flavourlen) {
			if (data->auth_flavourlen > 1)
				goto out_inval_auth;
2148
			if (copy_from_user(&args->auth_flavors[0],
2149
					   data->auth_flavours,
2150
					   sizeof(args->auth_flavors[0])))
2151 2152 2153 2154 2155 2156
				return -EFAULT;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2157
		args->nfs_server.hostname = c;
2158 2159 2160 2161

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2162 2163
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2164 2165 2166 2167

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
		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;
2185
		nfs_validate_transport_protocol(args);
2186 2187

		break;
2188
	default: {
2189
		int status;
2190 2191

		if (nfs_parse_mount_options((char *)options, args) == 0)
2192 2193 2194
			return -EINVAL;

		if (!nfs_verify_server_address((struct sockaddr *)
2195
						&args->nfs_server.address))
2196 2197
			return -EINVAL;

2198 2199 2200
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

2201 2202
		nfs_validate_transport_protocol(args);

2203
		if (args->auth_flavor_len > 1)
2204 2205
			goto out_inval_auth;

2206
		if (args->client_address == NULL)
2207 2208
			goto out_no_client_address;

2209 2210 2211 2212 2213 2214 2215 2216
		status = nfs_parse_devname(dev_name,
					   &args->nfs_server.hostname,
					   NFS4_MAXNAMLEN,
					   &args->nfs_server.export_path,
					   NFS4_MAXPATHLEN);
		if (status < 0)
			return status;

2217 2218
		break;
		}
2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	}

	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;
2235 2236 2237 2238

out_no_client_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
	return -EINVAL;
2239 2240
}

2241 2242 2243
/*
 * Get the superblock for an NFS4 mountpoint
 */
2244 2245
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
2246
{
2247
	struct nfs_parsed_mount_data *data;
2248 2249
	struct super_block *s;
	struct nfs_server *server;
2250
	struct nfs_fh *mntfh;
2251
	struct dentry *mntroot;
2252
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2253 2254 2255
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2256 2257 2258 2259 2260 2261
	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
2262

2263
	security_init_mnt_opts(&data->lsm_opts);
2264

2265
	/* Validate the mount data */
2266
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
2267 2268
	if (error < 0)
		goto out;
D
David Howells 已提交
2269

2270
	/* Get a volume representation */
2271
	server = nfs4_create_server(data, mntfh);
2272 2273
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2274
		goto out;
D
David Howells 已提交
2275
	}
T
Trond Myklebust 已提交
2276
	sb_mntdata.server = server;
D
David Howells 已提交
2277

2278 2279 2280
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2281
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2282
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2283 2284
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2285
		goto out_free;
2286 2287
	}

2288 2289 2290
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2291 2292 2293 2294
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2295 2296
	}

2297 2298 2299 2300
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}
D
David Howells 已提交
2301

2302
	mntroot = nfs4_get_root(s, mntfh);
2303 2304 2305
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2306
	}
2307

2308
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2309 2310 2311
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2312
	s->s_flags |= MS_ACTIVE;
2313 2314
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2315 2316 2317
	error = 0;

out:
2318 2319 2320 2321 2322 2323 2324
	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);
2325
	return error;
2326

D
David Howells 已提交
2327
out_free:
2328
	nfs_free_server(server);
2329
	goto out;
2330

2331 2332
error_splat_root:
	dput(mntroot);
2333 2334 2335
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2336
	goto out;
D
David Howells 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
}

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);
2347
	nfs_free_server(server);
D
David Howells 已提交
2348 2349 2350
}

/*
2351
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2352
 */
2353 2354 2355
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
2356
{
2357 2358 2359 2360
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2361
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2362 2363 2364
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2365
	int error;
D
David Howells 已提交
2366

2367
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2368

2369 2370 2371 2372 2373
	/* 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
2374
	}
T
Trond Myklebust 已提交
2375
	sb_mntdata.server = server;
D
David Howells 已提交
2376

2377 2378 2379
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2380
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2381
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2382 2383 2384
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2385 2386
	}

2387 2388 2389
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2390 2391 2392 2393
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2394
	}
D
David Howells 已提交
2395

2396 2397 2398 2399
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
	}
D
David Howells 已提交
2400

2401 2402 2403 2404 2405
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2406 2407 2408 2409 2410
	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
2411

2412 2413 2414 2415
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2416 2417
	security_sb_clone_mnt_opts(data->sb, s);

2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
	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
2432 2433
}

2434 2435 2436 2437 2438 2439
/*
 * 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
2440 2441
{
	struct nfs_clone_mount *data = raw_data;
2442 2443 2444 2445
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2446
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2447 2448 2449
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
	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
2460
	sb_mntdata.server = server;
2461

2462 2463 2464
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2465
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2466
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2467 2468 2469 2470 2471 2472 2473 2474
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2475 2476 2477 2478
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2479 2480 2481 2482 2483 2484 2485
	}

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

2486
	mntroot = nfs4_get_root(s, &mntfh);
2487 2488 2489 2490
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2491 2492 2493 2494 2495
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2496 2497 2498 2499 2500

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

2501 2502
	security_sb_clone_mnt_opts(data->sb, s);

2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
	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
2517 2518
}

2519
#endif /* CONFIG_NFS_V4 */