super.c 72.0 KB
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/*
 *  linux/fs/nfs/super.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  nfs superblock handling functions
 *
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 *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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 *  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>
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#include <linux/mnt_namespace.h>
#include <linux/namei.h>
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#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"
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#include "fscache.h"
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#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,
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	Opt_v2, Opt_v3, Opt_v4,
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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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	Opt_resvport, Opt_noresvport,
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	Opt_fscache, Opt_nofscache,
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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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	Opt_minorversion,
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	/* Mount options that take string arguments */
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	Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
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	Opt_addr, Opt_mountaddr, Opt_clientaddr,
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	Opt_lookupcache,
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	Opt_fscache_uniq,
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	/* Special mount options */
	Opt_userspace, Opt_deprecated, Opt_sloppy,
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	Opt_err
};

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

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	{ Opt_sloppy, "sloppy" },

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	{ Opt_soft, "soft" },
	{ Opt_hard, "hard" },
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	{ Opt_deprecated, "intr" },
	{ Opt_deprecated, "nointr" },
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	{ Opt_posix, "posix" },
	{ Opt_noposix, "noposix" },
	{ Opt_cto, "cto" },
	{ Opt_nocto, "nocto" },
	{ Opt_ac, "ac" },
	{ Opt_noac, "noac" },
	{ Opt_lock, "lock" },
	{ Opt_nolock, "nolock" },
	{ Opt_v2, "v2" },
	{ Opt_v3, "v3" },
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	{ Opt_v4, "v4" },
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	{ 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_resvport, "resvport" },
	{ Opt_noresvport, "noresvport" },
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	{ Opt_fscache, "fsc" },
	{ Opt_fscache_uniq, "fsc=%s" },
	{ Opt_nofscache, "nofsc" },
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	{ Opt_port, "port=%s" },
	{ Opt_rsize, "rsize=%s" },
	{ Opt_wsize, "wsize=%s" },
	{ Opt_bsize, "bsize=%s" },
	{ Opt_timeo, "timeo=%s" },
	{ Opt_retrans, "retrans=%s" },
	{ Opt_acregmin, "acregmin=%s" },
	{ Opt_acregmax, "acregmax=%s" },
	{ Opt_acdirmin, "acdirmin=%s" },
	{ Opt_acdirmax, "acdirmax=%s" },
	{ Opt_actimeo, "actimeo=%s" },
	{ Opt_namelen, "namlen=%s" },
	{ Opt_mountport, "mountport=%s" },
	{ Opt_mountvers, "mountvers=%s" },
	{ Opt_nfsvers, "nfsvers=%s" },
	{ Opt_nfsvers, "vers=%s" },
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	{ Opt_minorversion, "minorversion=%s" },
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	{ Opt_sec, "sec=%s" },
	{ Opt_proto, "proto=%s" },
	{ Opt_mountproto, "mountproto=%s" },
	{ Opt_addr, "addr=%s" },
	{ Opt_clientaddr, "clientaddr=%s" },
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	{ Opt_mounthost, "mounthost=%s" },
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	{ Opt_mountaddr, "mountaddr=%s" },
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	{ Opt_lookupcache, "lookupcache=%s" },

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	{ Opt_err, NULL }
};

enum {
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	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
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	Opt_xprt_err
};

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

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

	Opt_sec_err
};

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

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

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

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

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	{ Opt_sec_err, NULL }
};

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enum {
	Opt_lookupcache_all, Opt_lookupcache_positive,
	Opt_lookupcache_none,

	Opt_lookupcache_err
};

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

	{ Opt_lookupcache_err, NULL }
};

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

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

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

#ifdef CONFIG_NFS_V4
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static int nfs4_validate_text_mount_data(void *options,
	struct nfs_parsed_mount_data *args, const char *dev_name);
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static int nfs4_try_mount(int flags, const char *dev_name,
	struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
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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_remote_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 int nfs4_remote_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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static struct file_system_type nfs4_remote_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs4",
	.get_sb		= nfs4_remote_get_sb,
	.kill_sb	= nfs4_kill_super,
	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};

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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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static struct file_system_type nfs4_remote_referral_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs4",
	.get_sb		= nfs4_remote_referral_get_sb,
	.kill_sb	= nfs4_kill_super,
	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	switch (sap->sa_family) {
	case AF_INET: {
		struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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		seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
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		break;
	}
	case AF_INET6: {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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		seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
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		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
 */
537 538
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" },
546
		{ NFS_MOUNT_POSIX, ",posix", "" },
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		{ NFS_MOUNT_NOCTO, ",nocto", "" },
		{ NFS_MOUNT_NOAC, ",noac", "" },
		{ NFS_MOUNT_NONLM, ",nolock", "" },
		{ NFS_MOUNT_NOACL, ",noacl", "" },
551
		{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
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		{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
		{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
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		{ 0, NULL, NULL }
	};
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	const struct proc_nfs_info *nfs_infop;
557
	struct nfs_client *clp = nfss->nfs_client;
558
	u32 version = clp->rpc_ops->version;
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560
	seq_printf(m, ",vers=%u", version);
561 562
	seq_printf(m, ",rsize=%u", nfss->rsize);
	seq_printf(m, ",wsize=%u", nfss->wsize);
563 564 565
	if (nfss->bsize != 0)
		seq_printf(m, ",bsize=%u", nfss->bsize);
	seq_printf(m, ",namlen=%u", nfss->namelen);
566
	if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
567
		seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
568
	if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
569
		seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
570
	if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
571
		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
572
	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
573
		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);
	}
580 581
	seq_printf(m, ",proto=%s",
		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
582 583 584 585 586 587 588
	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);

589 590
	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
591
	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
592 593 594 595 596 597 598 599

	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
600 601
	if (nfss->options & NFS_OPTION_FSCACHE)
		seq_printf(m, ",fsc");
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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);

613 614 615
	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);
646 647 648 649
	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
652
	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
	 */
663
	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
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	if (auth->au_flavor)
665
		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];
680 681 682 683
#ifdef CONFIG_NFS_FSCACHE
		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
			totals.fscache[i] += stats->fscache[i];
#endif
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		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]);
694 695 696 697 698 699 700
#ifdef CONFIG_NFS_FSCACHE
	if (nfss->options & NFS_OPTION_FSCACHE) {
		seq_printf(m, "\n\tfsc:\t");
		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
			seq_printf(m, "%Lu ", totals.bytes[i]);
	}
#endif
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	seq_printf(m, "\n");

	rpc_print_iostats(m, nfss->client);

	return 0;
}

/*
 * Begin unmount by attempting to remove all automounted mountpoints we added
710
 * in response to xdev traversals and referrals
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 */
712
static void nfs_umount_begin(struct super_block *sb)
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{
714
	struct nfs_server *server;
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	struct rpc_clnt *rpc;

717 718 719
	lock_kernel();

	server = NFS_SB(sb);
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	/* -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);
727 728

	unlock_kernel();
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}

731
static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
732 733 734 735 736 737 738 739 740 741 742
{
	struct nfs_parsed_mount_data *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data) {
		data->rsize		= NFS_MAX_FILE_IO_SIZE;
		data->wsize		= NFS_MAX_FILE_IO_SIZE;
		data->acregmin		= NFS_DEF_ACREGMIN;
		data->acregmax		= NFS_DEF_ACREGMAX;
		data->acdirmin		= NFS_DEF_ACDIRMIN;
		data->acdirmax		= NFS_DEF_ACDIRMAX;
743
		data->mount_server.port	= NFS_UNSPEC_PORT;
744
		data->nfs_server.port	= NFS_UNSPEC_PORT;
745
		data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
746 747
		data->auth_flavors[0]	= RPC_AUTH_UNIX;
		data->auth_flavor_len	= 1;
748
		data->version		= version;
749 750 751 752 753
		data->minorversion	= 0;
	}
	return data;
}

754
/*
755 756 757 758
 * 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.
759 760 761 762 763
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
764
		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
766 767 768 769
	}
	case AF_INET6: {
		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
		return !ipv6_addr_any(sa);
770 771 772
	}
	}

773
	dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
774 775 776
	return 0;
}

777 778 779 780
/*
 * Select between a default port value and a user-specified port value.
 * If a zero value is set, then autobind will be used.
 */
781
static void nfs_set_port(struct sockaddr *sap, int *port,
782 783
				 const unsigned short default_port)
{
784 785
	if (*port == NFS_UNSPEC_PORT)
		*port = default_port;
786

787
	rpc_set_port(sap, *port);
788 789
}

790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
/*
 * 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;
	}
}

827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
/*
 * Parse the value of the 'sec=' option.
 */
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_flavors[0] = RPC_AUTH_NULL;
		break;
	case Opt_sec_sys:
		mnt->auth_flavors[0] = RPC_AUTH_UNIX;
		break;
	case Opt_sec_krb5:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
		break;
	case Opt_sec_krb5i:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
		break;
	case Opt_sec_krb5p:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
		break;
	case Opt_sec_lkey:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
		break;
	case Opt_sec_lkeyi:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
		break;
	case Opt_sec_lkeyp:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
		break;
	case Opt_sec_spkm:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
		break;
	case Opt_sec_spkmi:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
		break;
	case Opt_sec_spkmp:
		mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
		break;
	default:
		return 0;
	}

875
	mnt->auth_flavor_len = 1;
876 877 878
	return 1;
}

879 880
/*
 * Error-check and convert a string of mount options from user space into
881 882 883
 * a data structure.  The whole mount string is processed; bad options are
 * skipped as they are encountered.  If there were no errors, return 1;
 * otherwise return 0 (zero).
884 885 886 887
 */
static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
888
	char *p, *string, *secdata;
889
	int rc, sloppy = 0, invalid_option = 0;
890 891 892 893 894 895 896

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

897 898 899 900 901 902 903 904 905 906 907 908 909 910
	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);

911 912
	while ((p = strsep(&raw, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
913 914
		unsigned long option;
		int token;
915 916 917 918 919 920 921 922

		if (!*p)
			continue;

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

		token = match_token(p, nfs_mount_option_tokens, args);
		switch (token) {
923 924 925 926

		/*
		 * boolean options:  foo/nofoo
		 */
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
		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;
959
			mnt->version = 2;
960 961 962
			break;
		case Opt_v3:
			mnt->flags |= NFS_MOUNT_VER3;
963
			mnt->version = 3;
964
			break;
965 966 967 968 969 970
#ifdef CONFIG_NFS_V4
		case Opt_v4:
			mnt->flags &= ~NFS_MOUNT_VER3;
			mnt->version = 4;
			break;
#endif
971 972
		case Opt_udp:
			mnt->flags &= ~NFS_MOUNT_TCP;
973
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
974 975 976
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
977
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
978
			break;
\
\"Talpey, Thomas\ 已提交
979 980 981
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
982
			xprt_load_transport(p);
\
\"Talpey, Thomas\ 已提交
983
			break;
984 985 986 987 988 989 990 991 992 993 994 995
		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;
996 997 998 999 1000 1001
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
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1002 1003 1004 1005 1006 1007
		case Opt_resvport:
			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
			break;
		case Opt_noresvport:
			mnt->flags |= NFS_MOUNT_NORESVPORT;
			break;
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
		case Opt_fscache:
			mnt->options |= NFS_OPTION_FSCACHE;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = NULL;
			break;
		case Opt_nofscache:
			mnt->options &= ~NFS_OPTION_FSCACHE;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = NULL;
			break;
		case Opt_fscache_uniq:
			string = match_strdup(args);
			if (!string)
				goto out_nomem;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = string;
			mnt->options |= NFS_OPTION_FSCACHE;
			break;
1026

1027 1028 1029
		/*
		 * options that take numeric values
		 */
1030
		case Opt_port:
1031 1032 1033 1034 1035 1036
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option > USHORT_MAX)
1037 1038
				goto out_invalid_value;
			mnt->nfs_server.port = option;
1039 1040
			break;
		case Opt_rsize:
1041 1042 1043 1044 1045 1046
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1047 1048
				goto out_invalid_value;
			mnt->rsize = option;
1049 1050
			break;
		case Opt_wsize:
1051 1052 1053 1054 1055 1056
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1057 1058
				goto out_invalid_value;
			mnt->wsize = option;
1059 1060
			break;
		case Opt_bsize:
1061 1062 1063 1064 1065 1066
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1067 1068
				goto out_invalid_value;
			mnt->bsize = option;
1069 1070
			break;
		case Opt_timeo:
1071 1072 1073 1074 1075 1076
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option == 0)
1077 1078
				goto out_invalid_value;
			mnt->timeo = option;
1079 1080
			break;
		case Opt_retrans:
1081 1082 1083 1084 1085 1086
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option == 0)
1087 1088
				goto out_invalid_value;
			mnt->retrans = option;
1089 1090
			break;
		case Opt_acregmin:
1091 1092 1093 1094 1095 1096
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1097 1098
				goto out_invalid_value;
			mnt->acregmin = option;
1099 1100
			break;
		case Opt_acregmax:
1101 1102 1103 1104 1105 1106
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1107 1108
				goto out_invalid_value;
			mnt->acregmax = option;
1109 1110
			break;
		case Opt_acdirmin:
1111 1112 1113 1114 1115 1116
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1117 1118
				goto out_invalid_value;
			mnt->acdirmin = option;
1119 1120
			break;
		case Opt_acdirmax:
1121 1122 1123 1124 1125 1126
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1127 1128
				goto out_invalid_value;
			mnt->acdirmax = option;
1129 1130
			break;
		case Opt_actimeo:
1131 1132 1133 1134 1135 1136
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1137 1138 1139
				goto out_invalid_value;
			mnt->acregmin = mnt->acregmax =
			mnt->acdirmin = mnt->acdirmax = option;
1140 1141
			break;
		case Opt_namelen:
1142 1143 1144 1145 1146 1147
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1148 1149
				goto out_invalid_value;
			mnt->namlen = option;
1150 1151
			break;
		case Opt_mountport:
1152 1153 1154 1155 1156 1157
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option > USHORT_MAX)
1158 1159
				goto out_invalid_value;
			mnt->mount_server.port = option;
1160 1161
			break;
		case Opt_mountvers:
1162 1163 1164 1165 1166 1167
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 ||
1168
			    option < NFS_MNT_VERSION ||
1169 1170 1171
			    option > NFS_MNT3_VERSION)
				goto out_invalid_value;
			mnt->mount_server.version = option;
1172 1173
			break;
		case Opt_nfsvers:
1174 1175 1176 1177 1178 1179
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
1180
				goto out_invalid_value;
1181
			switch (option) {
1182
			case NFS2_VERSION:
1183
				mnt->flags &= ~NFS_MOUNT_VER3;
1184
				mnt->version = 2;
1185
				break;
1186
			case NFS3_VERSION:
1187
				mnt->flags |= NFS_MOUNT_VER3;
1188 1189 1190 1191 1192 1193
				mnt->version = 3;
				break;
#ifdef CONFIG_NFS_V4
			case NFS4_VERSION:
				mnt->flags &= ~NFS_MOUNT_VER3;
				mnt->version = 4;
1194
				break;
1195
#endif
1196
			default:
1197
				goto out_invalid_value;
1198 1199
			}
			break;
1200
		case Opt_minorversion:
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			if (option > NFS4_MAX_MINOR_VERSION)
				goto out_invalid_value;
			mnt->minorversion = option;
1211
			break;
1212

1213 1214 1215
		/*
		 * options that take text values
		 */
1216 1217 1218 1219
		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1220
			rc = nfs_parse_security_flavors(string, mnt);
1221
			kfree(string);
1222 1223 1224
			if (!rc) {
				dfprintk(MOUNT, "NFS:   unrecognized "
						"security flavor\n");
1225
				return 0;
1226
			}
1227 1228 1229 1230 1231 1232 1233 1234 1235
			break;
		case Opt_proto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);

			switch (token) {
1236
			case Opt_xprt_udp:
1237
				mnt->flags &= ~NFS_MOUNT_TCP;
1238
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1239
				kfree(string);
1240
				break;
1241
			case Opt_xprt_tcp:
1242
				mnt->flags |= NFS_MOUNT_TCP;
1243
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1244
				kfree(string);
1245
				break;
\
\"Talpey, Thomas\ 已提交
1246 1247 1248 1249
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1250
				xprt_load_transport(string);
1251
				kfree(string);
\
\"Talpey, Thomas\ 已提交
1252
				break;
1253
			default:
1254 1255
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1256
				return 0;
1257 1258 1259 1260 1261 1262 1263 1264
			}
			break;
		case Opt_mountproto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
1265
			kfree(string);
1266 1267

			switch (token) {
1268
			case Opt_xprt_udp:
1269
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1270
				break;
1271
			case Opt_xprt_tcp:
1272
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1273
				break;
\
\"Talpey, Thomas\ 已提交
1274
			case Opt_xprt_rdma: /* not used for side protocols */
1275
			default:
1276 1277
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1278
				return 0;
1279 1280 1281 1282 1283 1284
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1285 1286 1287 1288 1289
			mnt->nfs_server.addrlen =
				rpc_pton(string, strlen(string),
					(struct sockaddr *)
					&mnt->nfs_server.address,
					sizeof(mnt->nfs_server.address));
1290
			kfree(string);
1291 1292
			if (mnt->nfs_server.addrlen == 0)
				goto out_invalid_address;
1293 1294 1295 1296 1297
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1298
			kfree(mnt->client_address);
1299 1300
			mnt->client_address = string;
			break;
1301 1302 1303 1304
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1305
			kfree(mnt->mount_server.hostname);
1306 1307
			mnt->mount_server.hostname = string;
			break;
1308
		case Opt_mountaddr:
1309 1310 1311
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1312 1313 1314 1315 1316
			mnt->mount_server.addrlen =
				rpc_pton(string, strlen(string),
					(struct sockaddr *)
					&mnt->mount_server.address,
					sizeof(mnt->mount_server.address));
1317
			kfree(string);
1318 1319
			if (mnt->mount_server.addrlen == 0)
				goto out_invalid_address;
1320
			break;
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
		case Opt_lookupcache:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					nfs_lookupcache_tokens, args);
			kfree(string);
			switch (token) {
				case Opt_lookupcache_all:
					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
					break;
				case Opt_lookupcache_positive:
					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
					break;
				case Opt_lookupcache_none:
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
					break;
				default:
					dfprintk(MOUNT, "NFS:   invalid "
							"lookupcache argument\n");
1342
					return 0;
1343 1344
			};
			break;
1345

1346 1347 1348 1349 1350 1351 1352
		/*
		 * Special options
		 */
		case Opt_sloppy:
			sloppy = 1;
			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
			break;
1353 1354
		case Opt_userspace:
		case Opt_deprecated:
1355 1356
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
1357 1358 1359
			break;

		default:
1360
			invalid_option = 1;
1361 1362
			dfprintk(MOUNT, "NFS:   unrecognized mount option "
					"'%s'\n", p);
1363 1364 1365
		}
	}

1366 1367 1368
	if (!sloppy && invalid_option)
		return 0;

1369 1370
	return 1;

1371 1372 1373
out_invalid_address:
	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
	return 0;
1374
out_invalid_value:
1375
	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1376
	return 0;
1377 1378 1379
out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1380 1381 1382 1383
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1384 1385
}

1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
/*
 * Match the requested auth flavors with the list returned by
 * the server.  Returns zero and sets the mount's authentication
 * flavor on success; returns -EACCES if server does not support
 * the requested flavor.
 */
static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
			     struct nfs_mount_request *request)
{
	unsigned int i, j, server_authlist_len = *(request->auth_flav_len);

1397 1398 1399 1400 1401 1402 1403 1404 1405 1406
	/*
	 * Certain releases of Linux's mountd return an empty
	 * flavor list.  To prevent behavioral regression with
	 * these servers (ie. rejecting mounts that used to
	 * succeed), revert to pre-2.6.32 behavior (no checking)
	 * if the returned flavor list is empty.
	 */
	if (server_authlist_len == 0)
		return 0;

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
	/*
	 * We avoid sophisticated negotiating here, as there are
	 * plenty of cases where we can get it wrong, providing
	 * either too little or too much security.
	 *
	 * RFC 2623, section 2.7 suggests we SHOULD prefer the
	 * flavor listed first.  However, some servers list
	 * AUTH_NULL first.  Our caller plants AUTH_SYS, the
	 * preferred default, in args->auth_flavors[0] if user
	 * didn't specify sec= mount option.
	 */
	for (i = 0; i < args->auth_flavor_len; i++)
		for (j = 0; j < server_authlist_len; j++)
			if (args->auth_flavors[i] == request->auth_flavs[j]) {
				dfprintk(MOUNT, "NFS: using auth flavor %d\n",
					request->auth_flavs[j]);
				args->auth_flavors[0] = request->auth_flavs[j];
				return 0;
			}

	dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
	nfs_umount(request);
	return -EACCES;
}

1432 1433 1434 1435 1436 1437 1438
/*
 * 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)
{
1439 1440
	rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
	unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1441 1442 1443 1444 1445 1446
	struct nfs_mount_request request = {
		.sap		= (struct sockaddr *)
						&args->mount_server.address,
		.dirpath	= args->nfs_server.export_path,
		.protocol	= args->mount_server.protocol,
		.fh		= root_fh,
1447
		.noresvport	= args->flags & NFS_MOUNT_NORESVPORT,
1448 1449
		.auth_flav_len	= &server_authlist_len,
		.auth_flavs	= server_authlist,
1450
	};
1451
	int status;
1452 1453

	if (args->mount_server.version == 0) {
1454 1455 1456 1457 1458 1459 1460
		switch (args->version) {
			default:
				args->mount_server.version = NFS_MNT3_VERSION;
				break;
			case 2:
				args->mount_server.version = NFS_MNT_VERSION;
		}
1461
	}
1462
	request.version = args->mount_server.version;
1463

1464
	if (args->mount_server.hostname)
1465
		request.hostname = args->mount_server.hostname;
1466
	else
1467
		request.hostname = args->nfs_server.hostname;
1468

1469 1470 1471
	/*
	 * Construct the mount server's address.
	 */
1472
	if (args->mount_server.address.ss_family == AF_UNSPEC) {
1473
		memcpy(request.sap, &args->nfs_server.address,
1474 1475 1476
		       args->nfs_server.addrlen);
		args->mount_server.addrlen = args->nfs_server.addrlen;
	}
1477
	request.salen = args->mount_server.addrlen;
1478
	nfs_set_port(request.sap, &args->mount_server.port, 0);
1479 1480 1481 1482 1483

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1484
	status = nfs_mount(&request);
1485 1486 1487 1488 1489
	if (status != 0) {
		dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
				request.hostname, status);
		return status;
	}
1490

1491 1492 1493 1494 1495 1496
	/*
	 * MNTv1 (NFSv2) does not support auth flavor negotiation.
	 */
	if (args->mount_server.version != NFS_MNT3_VERSION)
		return 0;
	return nfs_walk_authlist(args, &request);
1497 1498
}

1499 1500 1501
static int nfs_parse_simple_hostname(const char *dev_name,
				     char **hostname, size_t maxnamlen,
				     char **export_path, size_t maxpathlen)
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 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
{
	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;
}

1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
/*
 * 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
1634
/*
1635 1636
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
 *
 * 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
1649
 */
1650 1651
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1652 1653
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1654
{
1655
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1656
	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1657

1658 1659
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1660

1661
	switch (data->version) {
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
	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:
1677 1678 1679
		if (data->flags & NFS_MOUNT_VER3) {
			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
				goto out_invalid_fh;
1680
			mntfh->size = data->root.size;
1681 1682
			args->version = 3;
		} else {
1683
			mntfh->size = NFS2_FHSIZE;
1684 1685
			args->version = 2;
		}
1686 1687 1688 1689 1690 1691


		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);
1692

1693 1694 1695 1696
		/*
		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
		 * can deal with.
		 */
1697
		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
1698 1699 1700 1701 1702 1703 1704 1705
		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;
1706

1707
		memcpy(sap, &data->addr, sizeof(data->addr));
1708
		args->nfs_server.addrlen = sizeof(data->addr);
1709
		if (!nfs_verify_server_address(sap))
1710 1711
			goto out_no_address;

1712
		if (!(data->flags & NFS_MOUNT_TCP))
1713
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1714 1715 1716 1717
		/* 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;
1718 1719 1720

		if (data->flags & NFS_MOUNT_SECFLAVOUR)
			args->auth_flavors[0] = data->pseudoflavor;
1721 1722
		if (!args->nfs_server.hostname)
			goto out_nomem;
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749

		/*
		 * 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
		}

1750
		break;
1751 1752 1753
	default: {
		int status;

1754 1755
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1756

1757
		if (!nfs_verify_server_address(sap))
1758 1759
			goto out_no_address;

1760 1761 1762 1763 1764 1765 1766 1767
		if (args->version == 4)
#ifdef CONFIG_NFS_V4
			return nfs4_validate_text_mount_data(options,
							     args, dev_name);
#else
			goto out_v4_not_compiled;
#endif

1768
		nfs_set_port(sap, &args->nfs_server.port, 0);
1769

1770 1771
		nfs_set_mount_transport_protocol(args);

1772 1773 1774 1775 1776 1777 1778
		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);
1779

1780 1781
		kfree(args->nfs_server.export_path);
		args->nfs_server.export_path = NULL;
1782 1783

		if (status)
1784
			return status;
1785 1786 1787

		break;
		}
D
David Howells 已提交
1788
	}
1789 1790

#ifndef CONFIG_NFS_V3
1791
	if (args->version == 3)
1792 1793
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1794

1795
	return 0;
D
David Howells 已提交
1796

1797 1798 1799
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1800

1801 1802 1803 1804
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
1805

1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
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 */

1816 1817 1818 1819 1820 1821
#ifndef CONFIG_NFS_V4
out_v4_not_compiled:
	dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
	return -EPROTONOSUPPORT;
#endif /* !CONFIG_NFS_V4 */

1822 1823 1824 1825
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1826 1827 1828 1829 1830 1831 1832
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
1833 1834
}

1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
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) ||
1849
	    data->nfs_server.port != nfss->port ||
1850
	    data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
S
Stefan Richter 已提交
1851 1852
	    !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
			  (struct sockaddr *)&nfss->nfs_client->cl_addr))
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
		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;
1866
	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1867 1868 1869 1870 1871 1872 1873

	/*
	 * 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.
	 */
1874 1875 1876
	if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
	    (nfsvers <= 3 && (!options || (options->version >= 1 &&
					   options->version <= 6))))
1877 1878 1879 1880 1881 1882
		return 0;

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

1883
	lock_kernel();
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
	/* 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;
1895
	data->nfs_server.port = nfss->port;
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
	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);
1909
	unlock_kernel();
1910 1911 1912
	return error;
}

D
David Howells 已提交
1913
/*
1914
 * Initialise the common bits of the superblock
D
David Howells 已提交
1915
 */
1916
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1917
{
1918
	struct nfs_server *server = NFS_SB(sb);
1919

1920
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1921

1922 1923 1924
	/* 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));
1925

1926 1927 1928
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1929

1930 1931
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1932

J
Jens Axboe 已提交
1933 1934
	sb->s_bdi = &server->backing_dev_info;

1935
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1936 1937 1938
}

/*
1939
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1940
 */
1941 1942
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1943 1944
{
	struct nfs_server *server = NFS_SB(sb);
1945

1946 1947 1948 1949
	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
1950

1951
	if (server->nfs_client->rpc_ops->version == 3) {
1952 1953 1954 1955 1956
		/* 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;
1957
	}
1958 1959 1960

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1961 1962 1963
}

/*
1964
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1965
 */
1966 1967
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1968
{
1969 1970 1971 1972 1973
	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
1974

1975
	if (server->nfs_client->rpc_ops->version == 3) {
1976 1977
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1978 1979 1980 1981 1982
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1983 1984
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1985 1986
}

1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
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
2013
	return 1;
2014
Ebusy:
T
Trond Myklebust 已提交
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
	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;
}

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
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
2074 2075 2076 2077 2078 2079
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;

2080
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
2081 2082 2083 2084 2085 2086 2087
		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);
2088 2089
}

2090 2091 2092 2093 2094
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

2095 2096
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
2097 2098 2099
{
	struct nfs_server *server = NULL;
	struct super_block *s;
2100 2101
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
2102
	struct dentry *mntroot;
2103
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2104 2105 2106
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2107 2108
	int error = -ENOMEM;

2109
	data = nfs_alloc_parsed_mount_data(3);
2110 2111 2112
	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
2113

2114
	security_init_mnt_opts(&data->lsm_opts);
2115

2116
	/* Validate the mount data */
2117
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2118
	if (error < 0)
2119
		goto out;
D
David Howells 已提交
2120

2121 2122 2123 2124 2125 2126 2127 2128
#ifdef CONFIG_NFS_V4
	if (data->version == 4) {
		error = nfs4_try_mount(flags, dev_name, data, mnt);
		kfree(data->client_address);
		goto out;
	}
#endif	/* CONFIG_NFS_V4 */

2129
	/* Get a volume representation */
2130
	server = nfs_create_server(data, mntfh);
2131 2132
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2133
		goto out;
D
David Howells 已提交
2134
	}
T
Trond Myklebust 已提交
2135
	sb_mntdata.server = server;
D
David Howells 已提交
2136

2137 2138 2139
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2140
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2141
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2142 2143
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
2144
		goto out_err_nosb;
2145 2146
	}

2147 2148 2149
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2150 2151 2152 2153
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2154
	}
D
David Howells 已提交
2155

2156 2157
	if (!s->s_root) {
		/* initial superblock/root creation */
2158
		nfs_fill_super(s, data);
2159 2160
		nfs_fscache_get_super_cookie(
			s, data ? data->fscache_uniq : NULL, NULL);
2161
	}
D
David Howells 已提交
2162

2163
	mntroot = nfs_get_root(s, mntfh);
2164 2165 2166
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2167
	}
2168

2169
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2170 2171 2172
	if (error)
		goto error_splat_root;

2173 2174 2175
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2176 2177 2178
	error = 0;

out:
2179 2180
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
2181
	kfree(data->fscache_uniq);
2182 2183 2184 2185
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
2186
	return error;
2187

2188 2189
out_err_nosb:
	nfs_free_server(server);
2190
	goto out;
2191

2192 2193
error_splat_root:
	dput(mntroot);
2194
error_splat_super:
2195
	deactivate_locked_super(s);
2196
	goto out;
D
David Howells 已提交
2197 2198
}

2199 2200 2201
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
2202 2203 2204 2205 2206
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

	kill_anon_super(s);
2207
	bdi_unregister(&server->backing_dev_info);
2208
	nfs_fscache_release_super_cookie(s);
2209
	nfs_free_server(server);
D
David Howells 已提交
2210 2211
}

2212 2213 2214 2215 2216 2217
/*
 * 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
2218 2219
{
	struct nfs_clone_mount *data = raw_data;
2220 2221 2222
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2223
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2224 2225 2226
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2227
	int error;
D
David Howells 已提交
2228

2229
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
2230

2231 2232 2233 2234 2235 2236
	/* 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
2237
	sb_mntdata.server = server;
2238

2239 2240 2241
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2242
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2243
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2244 2245 2246 2247
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
2248

2249 2250 2251
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2252 2253 2254 2255
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
2256
	}
2257

2258 2259 2260
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
2261
		nfs_fscache_get_super_cookie(s, NULL, data);
2262
	}
D
David Howells 已提交
2263

2264 2265 2266 2267
	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
2268
	}
2269
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2270 2271 2272 2273
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2274

2275 2276 2277
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
2278

2279 2280 2281
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

2282 2283
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
2284

2285 2286 2287 2288 2289
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
2290

2291
error_splat_super:
2292
	deactivate_locked_super(s);
2293 2294
	dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2295 2296
}

2297 2298
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
2299
/*
2300
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
2301
 */
2302 2303
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
2304
{
2305 2306 2307
	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
2308
	sb->s_time_gran = 1;
2309 2310
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
2311 2312
}

2313 2314 2315 2316
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
2317
{
2318 2319 2320
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
2321 2322
}

2323 2324 2325 2326 2327
static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
{
	args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
}

2328 2329 2330 2331 2332 2333
static int nfs4_validate_text_mount_data(void *options,
					 struct nfs_parsed_mount_data *args,
					 const char *dev_name)
{
	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;

2334
	nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2335 2336 2337 2338 2339

	nfs_validate_transport_protocol(args);

	nfs4_validate_mount_flags(args);

2340 2341 2342 2343 2344 2345
	if (args->version != 4) {
		dfprintk(MOUNT,
			 "NFS4: Illegal mount version\n");
		return -EINVAL;
	}

2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364
	if (args->auth_flavor_len > 1) {
		dfprintk(MOUNT,
			 "NFS4: Too many RPC auth flavours specified\n");
		return -EINVAL;
	}

	if (args->client_address == NULL) {
		dfprintk(MOUNT,
			 "NFS4: mount program didn't pass callback address\n");
		return -EINVAL;
	}

	return nfs_parse_devname(dev_name,
				   &args->nfs_server.hostname,
				   NFS4_MAXNAMLEN,
				   &args->nfs_server.export_path,
				   NFS4_MAXPATHLEN);
}

2365 2366 2367
/*
 * Validate NFSv4 mount options
 */
2368 2369 2370
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
2371
{
2372
	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2373
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2374 2375 2376 2377 2378 2379 2380
	char *c;

	if (data == NULL)
		goto out_no_data;

	switch (data->version) {
	case 1:
2381 2382 2383
		if (data->host_addrlen > sizeof(args->nfs_server.address))
			goto out_no_address;
		if (data->host_addrlen == 0)
2384
			goto out_no_address;
2385
		args->nfs_server.addrlen = data->host_addrlen;
2386
		if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2387
			return -EFAULT;
2388
		if (!nfs_verify_server_address(sap))
2389 2390
			goto out_no_address;

2391 2392 2393
		if (data->auth_flavourlen) {
			if (data->auth_flavourlen > 1)
				goto out_inval_auth;
2394
			if (copy_from_user(&args->auth_flavors[0],
2395
					   data->auth_flavours,
2396
					   sizeof(args->auth_flavors[0])))
2397 2398 2399 2400 2401 2402
				return -EFAULT;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2403
		args->nfs_server.hostname = c;
2404 2405 2406 2407

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2408 2409
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2410 2411 2412 2413

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
		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;
2431
		nfs_validate_transport_protocol(args);
2432 2433

		break;
2434
	default:
2435
		if (nfs_parse_mount_options((char *)options, args) == 0)
2436 2437
			return -EINVAL;

2438
		if (!nfs_verify_server_address(sap))
2439
			return -EINVAL;
2440

2441
		return nfs4_validate_text_mount_data(options, args, dev_name);
2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
	}

	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;
}

2460
/*
2461
 * Get the superblock for the NFS4 root partition
2462
 */
2463
static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2464
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
D
David Howells 已提交
2465
{
2466
	struct nfs_parsed_mount_data *data = raw_data;
2467 2468
	struct super_block *s;
	struct nfs_server *server;
2469
	struct nfs_fh *mntfh;
2470
	struct dentry *mntroot;
2471
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2472 2473 2474
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2475 2476 2477 2478 2479
	int error = -ENOMEM;

	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
2480

2481
	security_init_mnt_opts(&data->lsm_opts);
2482

2483
	/* Get a volume representation */
2484
	server = nfs4_create_server(data, mntfh);
2485 2486
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2487
		goto out;
D
David Howells 已提交
2488
	}
T
Trond Myklebust 已提交
2489
	sb_mntdata.server = server;
D
David Howells 已提交
2490

2491 2492 2493
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2494
	/* Get a superblock - note that we may end up sharing one that already exists */
2495
	s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2496 2497
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2498
		goto out_free;
2499 2500
	}

2501 2502 2503
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2504 2505 2506 2507
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2508 2509
	}

2510 2511 2512
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
2513 2514
		nfs_fscache_get_super_cookie(
			s, data ? data->fscache_uniq : NULL, NULL);
2515
	}
D
David Howells 已提交
2516

2517
	mntroot = nfs4_get_root(s, mntfh);
2518 2519 2520
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2521
	}
2522

2523
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2524 2525 2526
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2527
	s->s_flags |= MS_ACTIVE;
2528 2529
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2530 2531 2532
	error = 0;

out:
2533 2534 2535
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
2536
	return error;
2537

D
David Howells 已提交
2538
out_free:
2539
	nfs_free_server(server);
2540
	goto out;
2541

2542 2543
error_splat_root:
	dput(mntroot);
2544
error_splat_super:
2545
	deactivate_locked_super(s);
2546
	goto out;
D
David Howells 已提交
2547 2548
}

2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
		int flags, void *data, const char *hostname)
{
	struct vfsmount *root_mnt;
	char *root_devname;
	size_t len;

	len = strlen(hostname) + 3;
	root_devname = kmalloc(len, GFP_KERNEL);
	if (root_devname == NULL)
		return ERR_PTR(-ENOMEM);
	snprintf(root_devname, len, "%s:/", hostname);
	root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
	kfree(root_devname);
	return root_mnt;
}

2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
{
	char *page = (char *) __get_free_page(GFP_KERNEL);
	char *devname, *tmp;

	if (page == NULL)
		return;
	devname = nfs_path(path->mnt->mnt_devname,
			path->mnt->mnt_root, path->dentry,
			page, PAGE_SIZE);
	if (devname == NULL)
		goto out_freepage;
	tmp = kstrdup(devname, GFP_KERNEL);
	if (tmp == NULL)
		goto out_freepage;
	kfree(mnt->mnt_devname);
	mnt->mnt_devname = tmp;
out_freepage:
	free_page((unsigned long)page);
}

2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612
static int nfs_follow_remote_path(struct vfsmount *root_mnt,
		const char *export_path, struct vfsmount *mnt_target)
{
	struct mnt_namespace *ns_private;
	struct nameidata nd;
	struct super_block *s;
	int ret;

	ns_private = create_mnt_ns(root_mnt);
	ret = PTR_ERR(ns_private);
	if (IS_ERR(ns_private))
		goto out_mntput;

	ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
			export_path, LOOKUP_FOLLOW, &nd);

	put_mnt_ns(ns_private);

	if (ret != 0)
		goto out_err;

	s = nd.path.mnt->mnt_sb;
	atomic_inc(&s->s_active);
	mnt_target->mnt_sb = s;
	mnt_target->mnt_root = dget(nd.path.dentry);

2613 2614 2615
	/* Correct the device pathname */
	nfs_fix_devname(&nd.path, mnt_target);

2616 2617 2618 2619 2620 2621 2622 2623 2624
	path_put(&nd.path);
	down_write(&s->s_umount);
	return 0;
out_mntput:
	mntput(root_mnt);
out_err:
	return ret;
}

2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652
static int nfs4_try_mount(int flags, const char *dev_name,
			 struct nfs_parsed_mount_data *data,
			 struct vfsmount *mnt)
{
	char *export_path;
	struct vfsmount *root_mnt;
	int error;

	dfprintk(MOUNT, "--> nfs4_try_mount()\n");

	export_path = data->nfs_server.export_path;
	data->nfs_server.export_path = "/";
	root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
			data->nfs_server.hostname);
	data->nfs_server.export_path = export_path;

	error = PTR_ERR(root_mnt);
	if (IS_ERR(root_mnt))
		goto out;

	error = nfs_follow_remote_path(root_mnt, export_path, mnt);

out:
	dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
			error != 0 ? " [error]" : "");
	return error;
}

2653 2654 2655 2656 2657 2658 2659 2660 2661
/*
 * Get the superblock for an NFS4 mountpoint
 */
static int nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
	struct nfs_parsed_mount_data *data;
	int error = -ENOMEM;

2662
	data = nfs_alloc_parsed_mount_data(4);
2663 2664 2665 2666 2667 2668 2669 2670
	if (data == NULL)
		goto out_free_data;

	/* Validate the mount data */
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
	if (error < 0)
		goto out;

2671
	error = nfs4_try_mount(flags, dev_name, data, mnt);
2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684

out:
	kfree(data->client_address);
	kfree(data->nfs_server.export_path);
	kfree(data->nfs_server.hostname);
	kfree(data->fscache_uniq);
out_free_data:
	kfree(data);
	dprintk("<-- nfs4_get_sb() = %d%s\n", error,
			error != 0 ? " [error]" : "");
	return error;
}

D
David Howells 已提交
2685 2686 2687 2688
static void nfs4_kill_super(struct super_block *sb)
{
	struct nfs_server *server = NFS_SB(sb);

A
Andy Adamson 已提交
2689
	dprintk("--> %s\n", __func__);
2690
	nfs_super_return_all_delegations(sb);
D
David Howells 已提交
2691
	kill_anon_super(sb);
2692
	nfs_fscache_release_super_cookie(sb);
2693
	nfs_free_server(server);
A
Andy Adamson 已提交
2694
	dprintk("<-- %s\n", __func__);
D
David Howells 已提交
2695 2696 2697
}

/*
2698
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2699
 */
2700 2701 2702
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
2703
{
2704 2705 2706 2707
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2708
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2709 2710 2711
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2712
	int error;
D
David Howells 已提交
2713

2714
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2715

2716 2717 2718 2719 2720
	/* 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
2721
	}
T
Trond Myklebust 已提交
2722
	sb_mntdata.server = server;
D
David Howells 已提交
2723

2724 2725 2726
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2727
	/* Get a superblock - note that we may end up sharing one that already exists */
2728
	s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2729 2730 2731
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2732 2733
	}

2734 2735 2736
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2737 2738 2739 2740
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2741
	}
D
David Howells 已提交
2742

2743 2744 2745
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
2746
		nfs_fscache_get_super_cookie(s, NULL, data);
2747
	}
D
David Howells 已提交
2748

2749 2750 2751 2752 2753
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2754 2755 2756 2757 2758
	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
2759

2760 2761 2762 2763
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2764 2765
	security_sb_clone_mnt_opts(data->sb, s);

2766 2767 2768 2769 2770 2771 2772 2773 2774 2775
	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:
2776
	deactivate_locked_super(s);
2777 2778
	dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2779 2780
}

2781 2782 2783
static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
		int flags, const char *dev_name, void *raw_data,
		struct vfsmount *mnt)
D
David Howells 已提交
2784 2785
{
	struct nfs_clone_mount *data = raw_data;
2786 2787 2788 2789
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2790
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2791 2792 2793
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803
	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
2804
	sb_mntdata.server = server;
2805

2806 2807 2808
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2809
	/* Get a superblock - note that we may end up sharing one that already exists */
2810
	s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2811 2812 2813 2814 2815 2816 2817 2818
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2819 2820 2821 2822
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2823 2824 2825 2826 2827
	}

	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
2828
		nfs_fscache_get_super_cookie(s, NULL, data);
2829 2830
	}

2831
	mntroot = nfs4_get_root(s, &mntfh);
2832 2833 2834 2835
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2836 2837 2838 2839 2840
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2841 2842 2843 2844 2845

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

2846 2847
	security_sb_clone_mnt_opts(data->sb, s);

2848 2849 2850 2851 2852 2853 2854 2855 2856 2857
	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:
2858
	deactivate_locked_super(s);
2859 2860
	dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2861 2862
}

2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
/*
 * Create an NFS4 server record on referral traversal
 */
static int nfs4_referral_get_sb(struct file_system_type *fs_type,
		int flags, const char *dev_name, void *raw_data,
		struct vfsmount *mnt)
{
	struct nfs_clone_mount *data = raw_data;
	char *export_path;
	struct vfsmount *root_mnt;
	int error;

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

	export_path = data->mnt_path;
	data->mnt_path = "/";

	root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
			flags, data, data->hostname);
	data->mnt_path = export_path;

	error = PTR_ERR(root_mnt);
	if (IS_ERR(root_mnt))
		goto out;

	error = nfs_follow_remote_path(root_mnt, export_path, mnt);
out:
	dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
			error != 0 ? " [error]" : "");
	return error;
}

2895
#endif /* CONFIG_NFS_V4 */