super.c 64.2 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>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
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#include <linux/in6.h>
#include <net/ipv6.h>
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#include <linux/netdevice.h>
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#include <linux/nfs_xdr.h>
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#include <linux/magic.h>
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#include <linux/parser.h>
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#include <asm/system.h>
#include <asm/uaccess.h>

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

#define NFSDBG_FACILITY		NFSDBG_VFS

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

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

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	{ Opt_sloppy, "sloppy" },

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

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

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	{ Opt_err, NULL }
};

enum {
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	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
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	Opt_xprt_err
};

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

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

	Opt_sec_err
};

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

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

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

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

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	{ Opt_sec_err, NULL }
};

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enum {
	Opt_lookupcache_all, Opt_lookupcache_positive,
	Opt_lookupcache_none,

	Opt_lookupcache_err
};

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

	{ Opt_lookupcache_err, NULL }
};

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

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

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

#ifdef CONFIG_NFS_V4
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static int nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static int nfs4_referral_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static void nfs4_kill_super(struct super_block *sb);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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/*
 * Describe the mount options in force on this server representation
 */
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static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
				   int showdefaults)
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{
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	static const struct proc_nfs_info {
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		int flag;
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		const char *str;
		const char *nostr;
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	} nfs_info[] = {
		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
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		{ NFS_MOUNT_INTR, ",intr", ",nointr" },
		{ NFS_MOUNT_POSIX, ",posix", "" },
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		{ NFS_MOUNT_NOCTO, ",nocto", "" },
		{ NFS_MOUNT_NOAC, ",noac", "" },
		{ NFS_MOUNT_NONLM, ",nolock", "" },
		{ NFS_MOUNT_NOACL, ",noacl", "" },
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		{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
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		{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
		{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
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		{ 0, NULL, NULL }
	};
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	const struct proc_nfs_info *nfs_infop;
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	struct nfs_client *clp = nfss->nfs_client;
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	u32 version = clp->rpc_ops->version;
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	seq_printf(m, ",vers=%u", version);
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	seq_printf(m, ",rsize=%u", nfss->rsize);
	seq_printf(m, ",wsize=%u", nfss->wsize);
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	if (nfss->bsize != 0)
		seq_printf(m, ",bsize=%u", nfss->bsize);
	seq_printf(m, ",namlen=%u", nfss->namelen);
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	if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
535
		seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
536
	if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
537
		seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
538
	if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
539
		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
540
	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
541
		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);
	}
548 549
	seq_printf(m, ",proto=%s",
		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
550 551 552 553 554 555 556
	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);

557 558
	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
559
	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
560 561 562 563 564 565 566 567

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

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

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

	nfs_show_mount_options(m, nfss, 0);

579 580 581
	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);
612 613 614 615
	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
618
	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
	 */
629
	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
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	if (auth->au_flavor)
631
		seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
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632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664

	/*
	 * Display superblock I/O counters
	 */
	for_each_possible_cpu(cpu) {
		struct nfs_iostats *stats;

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

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

		preempt_enable();
	}

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

	rpc_print_iostats(m, nfss->client);

	return 0;
}

/*
 * Begin unmount by attempting to remove all automounted mountpoints we added
665
 * in response to xdev traversals and referrals
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 */
667
static void nfs_umount_begin(struct super_block *sb)
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{
669
	struct nfs_server *server = NFS_SB(sb);
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	struct rpc_clnt *rpc;

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

681
/*
682 683 684 685
 * 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.
686 687 688 689 690
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
691
		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
693 694 695 696
	}
	case AF_INET6: {
		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
		return !ipv6_addr_any(sa);
697 698 699 700 701 702
	}
	}

	return 0;
}

703 704
static void nfs_parse_ipv4_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
705
{
706 707
	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
	u8 *addr = (u8 *)&sin->sin_addr.s_addr;
708

709 710 711 712 713 714 715
	if (str_len <= INET_ADDRSTRLEN) {
		dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
				(int)str_len, string);

		sin->sin_family = AF_INET;
		*addr_len = sizeof(*sin);
		if (in4_pton(string, str_len, addr, '\0', NULL))
716
			return;
717 718 719 720 721 722 723
	}

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

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
724 725 726
static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
				   const char *delim,
				   struct sockaddr_in6 *sin6)
727 728 729 730
{
	char *p;
	size_t len;

731 732 733
	if ((string + str_len) == delim)
		return 1;

734
	if (*delim != IPV6_SCOPE_DELIMITER)
735 736 737 738
		return 0;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return 0;
739 740 741 742 743 744 745 746 747 748 749 750

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

		dev = dev_get_by_name(&init_net, p);
		if (dev != NULL) {
			scope_id = dev->ifindex;
			dev_put(dev);
		} else {
751 752 753 754
			if (strict_strtoul(p, 10, &scope_id) == 0) {
				kfree(p);
				return 0;
			}
755 756 757
		}

		kfree(p);
758

759 760
		sin6->sin6_scope_id = scope_id;
		dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
761
		return 1;
762
	}
763 764

	return 0;
765 766
}

767 768 769 770 771
static void nfs_parse_ipv6_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
{
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
	u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
772
	const char *delim;
773 774 775 776

	if (str_len <= INET6_ADDRSTRLEN) {
		dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
				(int)str_len, string);
777

778 779
		sin6->sin6_family = AF_INET6;
		*addr_len = sizeof(*sin6);
780 781 782 783 784
		if (in6_pton(string, str_len, addr,
					IPV6_SCOPE_DELIMITER, &delim) != 0) {
			if (nfs_parse_ipv6_scope_id(string, str_len,
							delim, sin6) != 0)
				return;
785
		}
786
	}
787 788

	sap->sa_family = AF_UNSPEC;
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806
	*addr_len = 0;
}
#else
static void nfs_parse_ipv6_address(char *string, size_t str_len,
				   struct sockaddr *sap, size_t *addr_len)
{
	sap->sa_family = AF_UNSPEC;
	*addr_len = 0;
}
#endif

/*
 * Construct a sockaddr based on the contents of a string that contains
 * an IP address in presentation format.
 *
 * If there is a problem constructing the new sockaddr, set the address
 * family to AF_UNSPEC.
 */
807
void nfs_parse_ip_address(char *string, size_t str_len,
808 809 810 811 812 813 814 815 816 817 818 819 820
				 struct sockaddr *sap, size_t *addr_len)
{
	unsigned int i, colons;

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

	if (colons >= 2)
		nfs_parse_ipv6_address(string, str_len, sap, addr_len);
	else
		nfs_parse_ipv4_address(string, str_len, sap, addr_len);
821 822
}

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
/*
 * 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;
	}
}

860 861 862
/*
 * Parse the value of the 'sec=' option.
 *
863
 * The flavor_len setting is for v4 mounts.
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
 */
static int nfs_parse_security_flavors(char *value,
				      struct nfs_parsed_mount_data *mnt)
{
	substring_t args[MAX_OPT_ARGS];

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

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

	return 1;
}

924 925 926 927 928
static void nfs_parse_invalid_value(const char *option)
{
	dfprintk(MOUNT, "NFS:   bad value specified for %s option\n", option);
}

929 930
/*
 * Error-check and convert a string of mount options from user space into
931 932 933
 * 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).
934 935 936 937
 */
static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
938
	char *p, *string, *secdata;
939
	int rc, sloppy = 0, errors = 0;
940 941 942 943 944 945 946

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

947 948 949 950 951 952 953 954 955 956 957 958 959 960
	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);

961 962 963 964 965 966 967 968 969 970 971
	while ((p = strsep(&raw, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int option, token;

		if (!*p)
			continue;

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

		token = match_token(p, nfs_mount_option_tokens, args);
		switch (token) {
972 973 974 975

		/*
		 * boolean options:  foo/nofoo
		 */
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
		case Opt_soft:
			mnt->flags |= NFS_MOUNT_SOFT;
			break;
		case Opt_hard:
			mnt->flags &= ~NFS_MOUNT_SOFT;
			break;
		case Opt_posix:
			mnt->flags |= NFS_MOUNT_POSIX;
			break;
		case Opt_noposix:
			mnt->flags &= ~NFS_MOUNT_POSIX;
			break;
		case Opt_cto:
			mnt->flags &= ~NFS_MOUNT_NOCTO;
			break;
		case Opt_nocto:
			mnt->flags |= NFS_MOUNT_NOCTO;
			break;
		case Opt_ac:
			mnt->flags &= ~NFS_MOUNT_NOAC;
			break;
		case Opt_noac:
			mnt->flags |= NFS_MOUNT_NOAC;
			break;
		case Opt_lock:
			mnt->flags &= ~NFS_MOUNT_NONLM;
			break;
		case Opt_nolock:
			mnt->flags |= NFS_MOUNT_NONLM;
			break;
		case Opt_v2:
			mnt->flags &= ~NFS_MOUNT_VER3;
			break;
		case Opt_v3:
			mnt->flags |= NFS_MOUNT_VER3;
			break;
		case Opt_udp:
			mnt->flags &= ~NFS_MOUNT_TCP;
1014
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1015 1016 1017
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
1018
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1019
			break;
\
\"Talpey, Thomas\ 已提交
1020 1021 1022 1023
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			break;
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
		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;
1036 1037 1038 1039 1040 1041
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;
C
Chuck Lever 已提交
1042 1043 1044 1045 1046 1047
		case Opt_resvport:
			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
			break;
		case Opt_noresvport:
			mnt->flags |= NFS_MOUNT_NORESVPORT;
			break;
1048

1049 1050 1051
		/*
		 * options that take numeric values
		 */
1052
		case Opt_port:
1053 1054 1055 1056 1057 1058
			if (match_int(args, &option) ||
			    option < 0 || option > USHORT_MAX) {
				errors++;
				nfs_parse_invalid_value("port");
			} else
				mnt->nfs_server.port = option;
1059 1060
			break;
		case Opt_rsize:
1061 1062 1063 1064 1065
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("rsize");
			} else
				mnt->rsize = option;
1066 1067
			break;
		case Opt_wsize:
1068 1069 1070 1071 1072
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("wsize");
			} else
				mnt->wsize = option;
1073 1074
			break;
		case Opt_bsize:
1075 1076 1077 1078 1079
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("bsize");
			} else
				mnt->bsize = option;
1080 1081
			break;
		case Opt_timeo:
1082 1083 1084 1085 1086
			if (match_int(args, &option) || option <= 0) {
				errors++;
				nfs_parse_invalid_value("timeo");
			} else
				mnt->timeo = option;
1087 1088
			break;
		case Opt_retrans:
1089 1090 1091 1092 1093
			if (match_int(args, &option) || option <= 0) {
				errors++;
				nfs_parse_invalid_value("retrans");
			} else
				mnt->retrans = option;
1094 1095
			break;
		case Opt_acregmin:
1096 1097 1098 1099 1100
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acregmin");
			} else
				mnt->acregmin = option;
1101 1102
			break;
		case Opt_acregmax:
1103 1104 1105 1106 1107
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acregmax");
			} else
				mnt->acregmax = option;
1108 1109
			break;
		case Opt_acdirmin:
1110 1111 1112 1113 1114
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acdirmin");
			} else
				mnt->acdirmin = option;
1115 1116
			break;
		case Opt_acdirmax:
1117 1118 1119 1120 1121
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("acdirmax");
			} else
				mnt->acdirmax = option;
1122 1123
			break;
		case Opt_actimeo:
1124 1125 1126 1127 1128 1129
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("actimeo");
			} else
				mnt->acregmin = mnt->acregmax =
				mnt->acdirmin = mnt->acdirmax = option;
1130 1131
			break;
		case Opt_namelen:
1132 1133 1134 1135 1136
			if (match_int(args, &option) || option < 0) {
				errors++;
				nfs_parse_invalid_value("namlen");
			} else
				mnt->namlen = option;
1137 1138
			break;
		case Opt_mountport:
1139 1140 1141 1142 1143 1144
			if (match_int(args, &option) ||
			    option < 0 || option > USHORT_MAX) {
				errors++;
				nfs_parse_invalid_value("mountport");
			} else
				mnt->mount_server.port = option;
1145 1146
			break;
		case Opt_mountvers:
1147 1148 1149 1150 1151 1152 1153
			if (match_int(args, &option) ||
			    option < NFS_MNT_VERSION ||
			    option > NFS_MNT3_VERSION) {
				errors++;
				nfs_parse_invalid_value("mountvers");
			} else
				mnt->mount_server.version = option;
1154 1155
			break;
		case Opt_nfsvers:
1156 1157 1158 1159 1160
			if (match_int(args, &option)) {
				errors++;
				nfs_parse_invalid_value("nfsvers");
				break;
			}
1161
			switch (option) {
1162
			case NFS2_VERSION:
1163 1164
				mnt->flags &= ~NFS_MOUNT_VER3;
				break;
1165
			case NFS3_VERSION:
1166 1167 1168
				mnt->flags |= NFS_MOUNT_VER3;
				break;
			default:
1169 1170
				errors++;
				nfs_parse_invalid_value("nfsvers");
1171 1172 1173
			}
			break;

1174 1175 1176
		/*
		 * options that take text values
		 */
1177 1178 1179 1180
		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1181
			rc = nfs_parse_security_flavors(string, mnt);
1182
			kfree(string);
1183 1184 1185 1186 1187
			if (!rc) {
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"security flavor\n");
			}
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
			break;
		case Opt_proto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
1198
			case Opt_xprt_udp:
1199
				mnt->flags &= ~NFS_MOUNT_TCP;
1200
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1201
				break;
1202
			case Opt_xprt_tcp:
1203
				mnt->flags |= NFS_MOUNT_TCP;
1204
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1205
				break;
\
\"Talpey, Thomas\ 已提交
1206 1207 1208 1209 1210
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				break;
1211
			default:
1212 1213 1214
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
			}
			break;
		case Opt_mountproto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
1226
			case Opt_xprt_udp:
1227
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1228
				break;
1229
			case Opt_xprt_tcp:
1230
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1231
				break;
\
\"Talpey, Thomas\ 已提交
1232
			case Opt_xprt_rdma: /* not used for side protocols */
1233
			default:
1234 1235 1236
				errors++;
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
1237 1238 1239 1240 1241 1242
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1243 1244 1245 1246
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->nfs_server.address,
					     &mnt->nfs_server.addrlen);
1247 1248 1249 1250 1251 1252
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1253
			kfree(mnt->client_address);
1254 1255
			mnt->client_address = string;
			break;
1256 1257 1258 1259
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1260
			kfree(mnt->mount_server.hostname);
1261 1262
			mnt->mount_server.hostname = string;
			break;
1263
		case Opt_mountaddr:
1264 1265 1266
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
1267 1268 1269 1270
			nfs_parse_ip_address(string, strlen(string),
					     (struct sockaddr *)
						&mnt->mount_server.address,
					     &mnt->mount_server.addrlen);
1271 1272
			kfree(string);
			break;
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
		case Opt_lookupcache:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					nfs_lookupcache_tokens, args);
			kfree(string);
			switch (token) {
				case Opt_lookupcache_all:
					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
					break;
				case Opt_lookupcache_positive:
					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
					break;
				case Opt_lookupcache_none:
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
					break;
				default:
					errors++;
					dfprintk(MOUNT, "NFS:   invalid "
							"lookupcache argument\n");
			};
			break;
1297

1298 1299 1300 1301 1302 1303 1304
		/*
		 * Special options
		 */
		case Opt_sloppy:
			sloppy = 1;
			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
			break;
1305 1306
		case Opt_userspace:
		case Opt_deprecated:
1307 1308
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
1309 1310 1311
			break;

		default:
1312 1313 1314
			errors++;
			dfprintk(MOUNT, "NFS:   unrecognized mount option "
					"'%s'\n", p);
1315 1316 1317
		}
	}

1318 1319 1320 1321 1322 1323
	if (errors > 0) {
		dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
				errors, (errors == 1 ? "" : "s"));
		if (!sloppy)
			return 0;
	}
1324 1325 1326 1327 1328
	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
1329 1330 1331 1332
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
1333 1334
}

1335 1336 1337 1338 1339 1340 1341
/*
 * 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)
{
1342 1343 1344 1345 1346 1347
	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,
1348
		.noresvport	= args->flags & NFS_MOUNT_NORESVPORT,
1349
	};
1350
	int status;
1351 1352 1353 1354 1355 1356 1357

	if (args->mount_server.version == 0) {
		if (args->flags & NFS_MOUNT_VER3)
			args->mount_server.version = NFS_MNT3_VERSION;
		else
			args->mount_server.version = NFS_MNT_VERSION;
	}
1358
	request.version = args->mount_server.version;
1359

1360
	if (args->mount_server.hostname)
1361
		request.hostname = args->mount_server.hostname;
1362
	else
1363
		request.hostname = args->nfs_server.hostname;
1364

1365 1366 1367
	/*
	 * Construct the mount server's address.
	 */
1368
	if (args->mount_server.address.ss_family == AF_UNSPEC) {
1369
		memcpy(request.sap, &args->nfs_server.address,
1370 1371 1372
		       args->nfs_server.addrlen);
		args->mount_server.addrlen = args->nfs_server.addrlen;
	}
1373
	request.salen = args->mount_server.addrlen;
1374

1375 1376 1377
	/*
	 * autobind will be used if mount_server.port == 0
	 */
1378
	nfs_set_port(request.sap, args->mount_server.port);
1379 1380 1381 1382 1383

	/*
	 * Now ask the mount server to map our export path
	 * to a file handle.
	 */
1384
	status = nfs_mount(&request);
1385 1386
	if (status == 0)
		return 0;
1387

1388
	dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1389
			request.hostname, status);
1390 1391 1392
	return status;
}

1393 1394 1395
static int nfs_parse_simple_hostname(const char *dev_name,
				     char **hostname, size_t maxnamlen,
				     char **export_path, size_t maxpathlen)
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
{
	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;
}

1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
/*
 * 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
1528
/*
1529 1530
 * Validate the NFS2/NFS3 mount data
 * - fills in the mount root filehandle
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
 *
 * 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
1543
 */
1544 1545
static int nfs_validate_mount_data(void *options,
				   struct nfs_parsed_mount_data *args,
1546 1547
				   struct nfs_fh *mntfh,
				   const char *dev_name)
D
David Howells 已提交
1548
{
1549
	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1550

1551 1552
	if (data == NULL)
		goto out_no_data;
D
David Howells 已提交
1553

1554 1555 1556
	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
1557 1558 1559 1560
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
1561 1562
	args->mount_server.port	= 0;	/* autobind unless user sets port */
	args->nfs_server.port	= 0;	/* autobind unless user sets port */
1563
	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1564
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
1565

1566
	switch (data->version) {
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
	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:
1582 1583 1584
		if (data->flags & NFS_MOUNT_VER3) {
			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
				goto out_invalid_fh;
1585
			mntfh->size = data->root.size;
1586
		} else
1587 1588 1589 1590 1591 1592 1593
			mntfh->size = NFS2_FHSIZE;


		memcpy(mntfh->data, data->root.data, mntfh->size);
		if (mntfh->size < sizeof(mntfh->data))
			memset(mntfh->data + mntfh->size, 0,
			       sizeof(mntfh->data) - mntfh->size);
1594

1595 1596 1597 1598
		/*
		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
		 * can deal with.
		 */
1599
		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
1600 1601 1602 1603 1604 1605 1606 1607
		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;
1608 1609 1610 1611 1612 1613 1614 1615

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

1616
		if (!(data->flags & NFS_MOUNT_TCP))
1617
			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1618 1619 1620 1621
		/* 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;
1622 1623 1624

		if (data->flags & NFS_MOUNT_SECFLAVOUR)
			args->auth_flavors[0] = data->pseudoflavor;
1625 1626
		if (!args->nfs_server.hostname)
			goto out_nomem;
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653

		/*
		 * 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
		}

1654
		break;
1655 1656 1657
	default: {
		int status;

1658 1659
		if (nfs_parse_mount_options((char *)options, args) == 0)
			return -EINVAL;
1660

1661 1662 1663 1664
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
			goto out_no_address;

1665 1666 1667
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

1668 1669
		nfs_set_mount_transport_protocol(args);

1670 1671 1672 1673 1674 1675 1676
		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);
1677

1678 1679
		kfree(args->nfs_server.export_path);
		args->nfs_server.export_path = NULL;
1680 1681

		if (status)
1682
			return status;
1683 1684 1685

		break;
		}
D
David Howells 已提交
1686
	}
1687 1688

#ifndef CONFIG_NFS_V3
1689
	if (args->flags & NFS_MOUNT_VER3)
1690 1691
		goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
D
David Howells 已提交
1692

1693
	return 0;
D
David Howells 已提交
1694

1695 1696 1697
out_no_data:
	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
	return -EINVAL;
1698

1699 1700 1701 1702
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
1703

1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
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 */

1714 1715 1716 1717
out_nomem:
	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
	return -ENOMEM;

1718 1719 1720 1721 1722 1723 1724
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
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 1750 1751 1752 1753 1754 1755 1756
static int
nfs_compare_remount_data(struct nfs_server *nfss,
			 struct nfs_parsed_mount_data *data)
{
	if (data->flags != nfss->flags ||
	    data->rsize != nfss->rsize ||
	    data->wsize != nfss->wsize ||
	    data->retrans != nfss->client->cl_timeout->to_retries ||
	    data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
	    data->acregmin != nfss->acregmin / HZ ||
	    data->acregmax != nfss->acregmax / HZ ||
	    data->acdirmin != nfss->acdirmin / HZ ||
	    data->acdirmax != nfss->acdirmax / HZ ||
	    data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
	    data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
	    memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
		   data->nfs_server.addrlen) != 0)
		return -EINVAL;

	return 0;
}

static int
nfs_remount(struct super_block *sb, int *flags, char *raw_data)
{
	int error;
	struct nfs_server *nfss = sb->s_fs_info;
	struct nfs_parsed_mount_data *data;
	struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
	struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1757
	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1758 1759 1760 1761 1762 1763 1764

	/*
	 * 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.
	 */
1765 1766 1767
	if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
	    (nfsvers <= 3 && (!options || (options->version >= 1 &&
					   options->version <= 6))))
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
		return 0;

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

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

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

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

D
David Howells 已提交
1801
/*
1802
 * Initialise the common bits of the superblock
D
David Howells 已提交
1803
 */
1804
static inline void nfs_initialise_sb(struct super_block *sb)
D
David Howells 已提交
1805
{
1806
	struct nfs_server *server = NFS_SB(sb);
1807

1808
	sb->s_magic = NFS_SUPER_MAGIC;
D
David Howells 已提交
1809

1810 1811 1812
	/* 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));
1813

1814 1815 1816
	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
						 &sb->s_blocksize_bits);
D
David Howells 已提交
1817

1818 1819
	if (server->flags & NFS_MOUNT_NOAC)
		sb->s_flags |= MS_SYNCHRONOUS;
D
David Howells 已提交
1820

1821
	nfs_super_set_maxbytes(sb, server->maxfilesize);
D
David Howells 已提交
1822 1823 1824
}

/*
1825
 * Finish setting up an NFS2/3 superblock
D
David Howells 已提交
1826
 */
1827 1828
static void nfs_fill_super(struct super_block *sb,
			   struct nfs_parsed_mount_data *data)
D
David Howells 已提交
1829 1830
{
	struct nfs_server *server = NFS_SB(sb);
1831

1832 1833 1834 1835
	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
1836

1837 1838 1839 1840 1841 1842
	if (server->flags & NFS_MOUNT_VER3) {
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
1843
	}
1844 1845 1846

	sb->s_op = &nfs_sops;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1847 1848 1849
}

/*
1850
 * Finish setting up a cloned NFS2/3 superblock
D
David Howells 已提交
1851
 */
1852 1853
static void nfs_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
1854
{
1855 1856 1857 1858 1859
	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
1860 1861

	if (server->flags & NFS_MOUNT_VER3) {
1862 1863
		/* The VFS shouldn't apply the umask to mode bits. We will do
		 * so ourselves when necessary.
D
David Howells 已提交
1864 1865 1866 1867 1868
		 */
		sb->s_flags |= MS_POSIXACL;
		sb->s_time_gran = 1;
	}

1869 1870
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
1871 1872
}

1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900
#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)

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

	if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
		goto Ebusy;
	if (a->nfs_client != b->nfs_client)
		goto Ebusy;
	if (a->flags != b->flags)
		goto Ebusy;
	if (a->wsize != b->wsize)
		goto Ebusy;
	if (a->rsize != b->rsize)
		goto Ebusy;
	if (a->acregmin != b->acregmin)
		goto Ebusy;
	if (a->acregmax != b->acregmax)
		goto Ebusy;
	if (a->acdirmin != b->acdirmin)
		goto Ebusy;
	if (a->acdirmax != b->acdirmax)
		goto Ebusy;
	if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
		goto Ebusy;
T
Trond Myklebust 已提交
1901
	return 1;
1902
Ebusy:
T
Trond Myklebust 已提交
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
	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;
}

1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
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
1962 1963 1964 1965 1966 1967
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;

1968
	if (!nfs_compare_super_address(old, server))
T
Trond Myklebust 已提交
1969 1970 1971 1972 1973 1974 1975
		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);
1976 1977
}

1978 1979 1980 1981 1982
static int nfs_bdi_register(struct nfs_server *server)
{
	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

1983 1984
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
1985 1986 1987
{
	struct nfs_server *server = NULL;
	struct super_block *s;
1988 1989
	struct nfs_parsed_mount_data *data;
	struct nfs_fh *mntfh;
1990
	struct dentry *mntroot;
1991
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
1992 1993 1994
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
1995 1996 1997 1998 1999 2000
	int error = -ENOMEM;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
2001

2002
	security_init_mnt_opts(&data->lsm_opts);
2003

2004
	/* Validate the mount data */
2005
	error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2006
	if (error < 0)
2007
		goto out;
D
David Howells 已提交
2008

2009
	/* Get a volume representation */
2010
	server = nfs_create_server(data, mntfh);
2011 2012
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2013
		goto out;
D
David Howells 已提交
2014
	}
T
Trond Myklebust 已提交
2015
	sb_mntdata.server = server;
D
David Howells 已提交
2016

2017 2018 2019
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2020
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2021
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2022 2023
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
2024
		goto out_err_nosb;
2025 2026
	}

2027 2028 2029
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2030 2031 2032 2033
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2034
	}
D
David Howells 已提交
2035

2036 2037
	if (!s->s_root) {
		/* initial superblock/root creation */
2038
		nfs_fill_super(s, data);
2039
	}
D
David Howells 已提交
2040

2041
	mntroot = nfs_get_root(s, mntfh);
2042 2043 2044
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2045
	}
2046

2047
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2048 2049 2050
	if (error)
		goto error_splat_root;

2051 2052 2053
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2054 2055 2056
	error = 0;

out:
2057 2058 2059 2060 2061 2062
	kfree(data->nfs_server.hostname);
	kfree(data->mount_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
2063
	return error;
2064

2065 2066
out_err_nosb:
	nfs_free_server(server);
2067
	goto out;
2068

2069 2070
error_splat_root:
	dput(mntroot);
2071 2072 2073
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2074
	goto out;
D
David Howells 已提交
2075 2076
}

2077 2078 2079
/*
 * Destroy an NFS2/3 superblock
 */
D
David Howells 已提交
2080 2081 2082 2083
static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

2084
	bdi_unregister(&server->backing_dev_info);
D
David Howells 已提交
2085
	kill_anon_super(s);
2086
	nfs_free_server(server);
D
David Howells 已提交
2087 2088
}

2089 2090 2091 2092 2093 2094
/*
 * 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
2095 2096
{
	struct nfs_clone_mount *data = raw_data;
2097 2098 2099
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2100
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2101 2102 2103
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2104
	int error;
D
David Howells 已提交
2105

2106
	dprintk("--> nfs_xdev_get_sb()\n");
D
David Howells 已提交
2107

2108 2109 2110 2111 2112 2113
	/* 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
2114
	sb_mntdata.server = server;
2115

2116 2117 2118
	if (server->flags & NFS_MOUNT_UNSHARED)
		compare_super = NULL;

2119
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2120
	s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2121 2122 2123 2124
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}
2125

2126 2127 2128
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2129 2130 2131 2132
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
D
David Howells 已提交
2133
	}
2134

2135 2136 2137 2138
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs_clone_super(s, data->sb);
	}
D
David Howells 已提交
2139

2140 2141 2142 2143
	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
2144
	}
2145
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2146 2147 2148 2149
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
D
David Howells 已提交
2150

2151 2152 2153
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
D
David Howells 已提交
2154

2155 2156 2157
	/* clone any lsm security options from the parent to the new sb */
	security_sb_clone_mnt_opts(data->sb, s);

2158 2159
	dprintk("<-- nfs_xdev_get_sb() = 0\n");
	return 0;
2160

2161 2162 2163 2164 2165
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
2166

2167 2168 2169 2170 2171
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2172 2173
}

2174 2175
#ifdef CONFIG_NFS_V4

D
David Howells 已提交
2176
/*
2177
 * Finish setting up a cloned NFS4 superblock
D
David Howells 已提交
2178
 */
2179 2180
static void nfs4_clone_super(struct super_block *sb,
			    const struct super_block *old_sb)
D
David Howells 已提交
2181
{
2182 2183 2184
	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
2185
	sb->s_time_gran = 1;
2186 2187
	sb->s_op = old_sb->s_op;
 	nfs_initialise_sb(sb);
D
David Howells 已提交
2188 2189
}

2190 2191 2192 2193
/*
 * Set up an NFS4 superblock
 */
static void nfs4_fill_super(struct super_block *sb)
D
David Howells 已提交
2194
{
2195 2196 2197
	sb->s_time_gran = 1;
	sb->s_op = &nfs4_sops;
	nfs_initialise_sb(sb);
D
David Howells 已提交
2198 2199
}

2200 2201 2202
/*
 * Validate NFSv4 mount options
 */
2203 2204 2205
static int nfs4_validate_mount_data(void *options,
				    struct nfs_parsed_mount_data *args,
				    const char *dev_name)
2206
{
2207
	struct sockaddr_in *ap;
2208
	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2209 2210 2211 2212 2213
	char *c;

	if (data == NULL)
		goto out_no_data;

2214 2215
	args->rsize		= NFS_MAX_FILE_IO_SIZE;
	args->wsize		= NFS_MAX_FILE_IO_SIZE;
2216 2217 2218 2219
	args->acregmin		= NFS_DEF_ACREGMIN;
	args->acregmax		= NFS_DEF_ACREGMAX;
	args->acdirmin		= NFS_DEF_ACDIRMIN;
	args->acdirmax		= NFS_DEF_ACDIRMAX;
2220
	args->nfs_server.port	= NFS_PORT; /* 2049 unless user set port= */
2221 2222
	args->auth_flavors[0]	= RPC_AUTH_UNIX;
	args->auth_flavor_len	= 0;
2223

2224 2225
	switch (data->version) {
	case 1:
2226 2227 2228 2229
		ap = (struct sockaddr_in *)&args->nfs_server.address;
		if (data->host_addrlen > sizeof(args->nfs_server.address))
			goto out_no_address;
		if (data->host_addrlen == 0)
2230
			goto out_no_address;
2231 2232
		args->nfs_server.addrlen = data->host_addrlen;
		if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2233
			return -EFAULT;
2234 2235
		if (!nfs_verify_server_address((struct sockaddr *)
						&args->nfs_server.address))
2236 2237
			goto out_no_address;

2238 2239 2240
		if (data->auth_flavourlen) {
			if (data->auth_flavourlen > 1)
				goto out_inval_auth;
2241
			if (copy_from_user(&args->auth_flavors[0],
2242
					   data->auth_flavours,
2243
					   sizeof(args->auth_flavors[0])))
2244 2245 2246 2247 2248 2249
				return -EFAULT;
		}

		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2250
		args->nfs_server.hostname = c;
2251 2252 2253 2254

		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
		if (IS_ERR(c))
			return PTR_ERR(c);
2255 2256
		args->nfs_server.export_path = c;
		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2257 2258 2259 2260

		c = strndup_user(data->client_addr.data, 16);
		if (IS_ERR(c))
			return PTR_ERR(c);
2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
		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;
2278
		nfs_validate_transport_protocol(args);
2279 2280

		break;
2281
	default: {
2282
		int status;
2283 2284

		if (nfs_parse_mount_options((char *)options, args) == 0)
2285 2286 2287
			return -EINVAL;

		if (!nfs_verify_server_address((struct sockaddr *)
2288
						&args->nfs_server.address))
2289 2290
			return -EINVAL;

2291 2292 2293
		nfs_set_port((struct sockaddr *)&args->nfs_server.address,
				args->nfs_server.port);

2294 2295
		nfs_validate_transport_protocol(args);

2296
		if (args->auth_flavor_len > 1)
2297 2298
			goto out_inval_auth;

2299
		if (args->client_address == NULL)
2300 2301
			goto out_no_client_address;

2302 2303 2304 2305 2306 2307 2308 2309
		status = nfs_parse_devname(dev_name,
					   &args->nfs_server.hostname,
					   NFS4_MAXNAMLEN,
					   &args->nfs_server.export_path,
					   NFS4_MAXPATHLEN);
		if (status < 0)
			return status;

2310 2311
		break;
		}
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327
	}

	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;
2328 2329 2330 2331

out_no_client_address:
	dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
	return -EINVAL;
2332 2333
}

2334 2335 2336
/*
 * Get the superblock for an NFS4 mountpoint
 */
2337 2338
static int nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
D
David Howells 已提交
2339
{
2340
	struct nfs_parsed_mount_data *data;
2341 2342
	struct super_block *s;
	struct nfs_server *server;
2343
	struct nfs_fh *mntfh;
2344
	struct dentry *mntroot;
2345
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2346 2347 2348
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2349 2350 2351 2352 2353 2354
	int error = -ENOMEM;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
	if (data == NULL || mntfh == NULL)
		goto out_free_fh;
D
David Howells 已提交
2355

2356
	security_init_mnt_opts(&data->lsm_opts);
2357

2358
	/* Validate the mount data */
2359
	error = nfs4_validate_mount_data(raw_data, data, dev_name);
2360 2361
	if (error < 0)
		goto out;
D
David Howells 已提交
2362

2363
	/* Get a volume representation */
2364
	server = nfs4_create_server(data, mntfh);
2365 2366
	if (IS_ERR(server)) {
		error = PTR_ERR(server);
2367
		goto out;
D
David Howells 已提交
2368
	}
T
Trond Myklebust 已提交
2369
	sb_mntdata.server = server;
D
David Howells 已提交
2370

2371 2372 2373
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2374
	/* Get a superblock - note that we may end up sharing one that already exists */
T
Trond Myklebust 已提交
2375
	s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2376 2377
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
D
David Howells 已提交
2378
		goto out_free;
2379 2380
	}

2381 2382 2383
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2384 2385 2386 2387
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2388 2389
	}

2390 2391 2392 2393
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_fill_super(s);
	}
D
David Howells 已提交
2394

2395
	mntroot = nfs4_get_root(s, mntfh);
2396 2397 2398
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
D
David Howells 已提交
2399
	}
2400

2401
	error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2402 2403 2404
	if (error)
		goto error_splat_root;

D
David Howells 已提交
2405
	s->s_flags |= MS_ACTIVE;
2406 2407
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;
2408 2409 2410
	error = 0;

out:
2411 2412 2413 2414 2415 2416 2417
	kfree(data->client_address);
	kfree(data->nfs_server.export_path);
	kfree(data->nfs_server.hostname);
	security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
	kfree(mntfh);
	kfree(data);
2418
	return error;
2419

D
David Howells 已提交
2420
out_free:
2421
	nfs_free_server(server);
2422
	goto out;
2423

2424 2425
error_splat_root:
	dput(mntroot);
2426 2427 2428
error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
2429
	goto out;
D
David Howells 已提交
2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
}

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

	nfs_return_all_delegations(sb);
	kill_anon_super(sb);

	nfs4_renewd_prepare_shutdown(server);
2440
	nfs_free_server(server);
D
David Howells 已提交
2441 2442 2443
}

/*
2444
 * Clone an NFS4 server record on xdev traversal (FSID-change)
D
David Howells 已提交
2445
 */
2446 2447 2448
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
2449
{
2450 2451 2452 2453
	struct nfs_clone_mount *data = raw_data;
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
2454
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2455 2456 2457
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2458
	int error;
D
David Howells 已提交
2459

2460
	dprintk("--> nfs4_xdev_get_sb()\n");
D
David Howells 已提交
2461

2462 2463 2464 2465 2466
	/* 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
2467
	}
T
Trond Myklebust 已提交
2468
	sb_mntdata.server = server;
D
David Howells 已提交
2469

2470 2471 2472
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2473
	/* Get a superblock - note that we may end up sharing one that already exists */
2474
	s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2475 2476 2477
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
D
David Howells 已提交
2478 2479
	}

2480 2481 2482
	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2483 2484 2485 2486
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2487
	}
D
David Howells 已提交
2488

2489 2490 2491 2492
	if (!s->s_root) {
		/* initial superblock/root creation */
		nfs4_clone_super(s, data->sb);
	}
D
David Howells 已提交
2493

2494 2495 2496 2497 2498
	mntroot = nfs4_get_root(s, data->fh);
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2499 2500 2501 2502 2503
	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
2504

2505 2506 2507 2508
	s->s_flags |= MS_ACTIVE;
	mnt->mnt_sb = s;
	mnt->mnt_root = mntroot;

2509 2510
	security_sb_clone_mnt_opts(data->sb, s);

2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524
	dprintk("<-- nfs4_xdev_get_sb() = 0\n");
	return 0;

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

error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2525 2526
}

2527 2528 2529 2530 2531 2532
/*
 * Create an NFS4 server record on referral traversal
 */
static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
				const char *dev_name, void *raw_data,
				struct vfsmount *mnt)
D
David Howells 已提交
2533 2534
{
	struct nfs_clone_mount *data = raw_data;
2535 2536 2537 2538
	struct super_block *s;
	struct nfs_server *server;
	struct dentry *mntroot;
	struct nfs_fh mntfh;
2539
	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
T
Trond Myklebust 已提交
2540 2541 2542
	struct nfs_sb_mountdata sb_mntdata = {
		.mntflags = flags,
	};
2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
	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
2553
	sb_mntdata.server = server;
2554

2555 2556 2557
	if (server->flags & NFS4_MOUNT_UNSHARED)
		compare_super = NULL;

2558
	/* Get a superblock - note that we may end up sharing one that already exists */
2559
	s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2560 2561 2562 2563 2564 2565 2566 2567
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto out_err_nosb;
	}

	if (s->s_fs_info != server) {
		nfs_free_server(server);
		server = NULL;
2568 2569 2570 2571
	} else {
		error = nfs_bdi_register(server);
		if (error)
			goto error_splat_super;
2572 2573 2574 2575 2576 2577 2578
	}

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

2579
	mntroot = nfs4_get_root(s, &mntfh);
2580 2581 2582 2583
	if (IS_ERR(mntroot)) {
		error = PTR_ERR(mntroot);
		goto error_splat_super;
	}
2584 2585 2586 2587 2588
	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
		dput(mntroot);
		error = -ESTALE;
		goto error_splat_super;
	}
2589 2590 2591 2592 2593

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

2594 2595
	security_sb_clone_mnt_opts(data->sb, s);

2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609
	dprintk("<-- nfs4_referral_get_sb() = 0\n");
	return 0;

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

error_splat_super:
	up_write(&s->s_umount);
	deactivate_super(s);
	dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
	return error;
D
David Howells 已提交
2610 2611
}

2612
#endif /* CONFIG_NFS_V4 */