path: root/fs/nfs/fs_context.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/fs/nfs/fs_context.c
 *
 * Copyright (C) 1992 Rick Sladkey
 * Conversion to new mount api Copyright (C) David Howells
 *
 * NFS mount handling.
 *
 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
 */

#include <linux/compat.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include "nfs.h"
#include "internal.h"

#include "nfstrace.h"

#define NFSDBG_FACILITY		NFSDBG_MOUNT

#if IS_ENABLED(CONFIG_NFS_V3)
#define NFS_DEFAULT_VERSION 3
#else
#define NFS_DEFAULT_VERSION 2
#endif

#define NFS_MAX_CONNECTIONS 16

enum nfs_param {
	Opt_ac,
	Opt_acdirmax,
	Opt_acdirmin,
	Opt_acl,
	Opt_acregmax,
	Opt_acregmin,
	Opt_actimeo,
	Opt_addr,
	Opt_bg,
	Opt_bsize,
	Opt_clientaddr,
	Opt_cto,
	Opt_fg,
	Opt_fscache,
	Opt_fscache_flag,
	Opt_hard,
	Opt_intr,
	Opt_local_lock,
	Opt_lock,
	Opt_lookupcache,
	Opt_migration,
	Opt_minorversion,
	Opt_mountaddr,
	Opt_mounthost,
	Opt_mountport,
	Opt_mountproto,
	Opt_mountvers,
	Opt_namelen,
	Opt_nconnect,
	Opt_max_connect,
	Opt_port,
	Opt_posix,
	Opt_proto,
	Opt_rdirplus,
	Opt_rdma,
	Opt_resvport,
	Opt_retrans,
	Opt_retry,
	Opt_rsize,
	Opt_sec,
	Opt_sharecache,
	Opt_sloppy,
	Opt_soft,
	Opt_softerr,
	Opt_softreval,
	Opt_source,
	Opt_tcp,
	Opt_timeo,
	Opt_trunkdiscovery,
	Opt_udp,
	Opt_v,
	Opt_vers,
	Opt_wsize,
	Opt_write,
};

enum {
	Opt_local_lock_all,
	Opt_local_lock_flock,
	Opt_local_lock_none,
	Opt_local_lock_posix,
};

static const struct constant_table nfs_param_enums_local_lock[] = {
	{ "all",		Opt_local_lock_all },
	{ "flock",	Opt_local_lock_flock },
	{ "posix",	Opt_local_lock_posix },
	{ "none",		Opt_local_lock_none },
	{}
};

enum {
	Opt_lookupcache_all,
	Opt_lookupcache_none,
	Opt_lookupcache_positive,
};

static const struct constant_table nfs_param_enums_lookupcache[] = {
	{ "all",		Opt_lookupcache_all },
	{ "none",		Opt_lookupcache_none },
	{ "pos",		Opt_lookupcache_positive },
	{ "positive",		Opt_lookupcache_positive },
	{}
};

enum {
	Opt_write_lazy,
	Opt_write_eager,
	Opt_write_wait,
};

static const struct constant_table nfs_param_enums_write[] = {
	{ "lazy",		Opt_write_lazy },
	{ "eager",		Opt_write_eager },
	{ "wait",		Opt_write_wait },
	{}
};

static const struct fs_parameter_spec nfs_fs_parameters[] = {
	fsparam_flag_no("ac",		Opt_ac),
	fsparam_u32   ("acdirmax",	Opt_acdirmax),
	fsparam_u32   ("acdirmin",	Opt_acdirmin),
	fsparam_flag_no("acl",		Opt_acl),
	fsparam_u32   ("acregmax",	Opt_acregmax),
	fsparam_u32   ("acregmin",	Opt_acregmin),
	fsparam_u32   ("actimeo",	Opt_actimeo),
	fsparam_string("addr",		Opt_addr),
	fsparam_flag  ("bg",		Opt_bg),
	fsparam_u32   ("bsize",		Opt_bsize),
	fsparam_string("clientaddr",	Opt_clientaddr),
	fsparam_flag_no("cto",		Opt_cto),
	fsparam_flag  ("fg",		Opt_fg),
	fsparam_flag_no("fsc",		Opt_fscache_flag),
	fsparam_string("fsc",		Opt_fscache),
	fsparam_flag  ("hard",		Opt_hard),
	__fsparam(NULL, "intr",		Opt_intr,
		  fs_param_neg_with_no|fs_param_deprecated, NULL),
	fsparam_enum  ("local_lock",	Opt_local_lock, nfs_param_enums_local_lock),
	fsparam_flag_no("lock",		Opt_lock),
	fsparam_enum  ("lookupcache",	Opt_lookupcache, nfs_param_enums_lookupcache),
	fsparam_flag_no("migration",	Opt_migration),
	fsparam_u32   ("minorversion",	Opt_minorversion),
	fsparam_string("mountaddr",	Opt_mountaddr),
	fsparam_string("mounthost",	Opt_mounthost),
	fsparam_u32   ("mountport",	Opt_mountport),
	fsparam_string("mountproto",	Opt_mountproto),
	fsparam_u32   ("mountvers",	Opt_mountvers),
	fsparam_u32   ("namlen",	Opt_namelen),
	fsparam_u32   ("nconnect",	Opt_nconnect),
	fsparam_u32   ("max_connect",	Opt_max_connect),
	fsparam_string("nfsvers",	Opt_vers),
	fsparam_u32   ("port",		Opt_port),
	fsparam_flag_no("posix",	Opt_posix),
	fsparam_string("proto",		Opt_proto),
	fsparam_flag_no("rdirplus",	Opt_rdirplus),
	fsparam_flag  ("rdma",		Opt_rdma),
	fsparam_flag_no("resvport",	Opt_resvport),
	fsparam_u32   ("retrans",	Opt_retrans),
	fsparam_string("retry",		Opt_retry),
	fsparam_u32   ("rsize",		Opt_rsize),
	fsparam_string("sec",		Opt_sec),
	fsparam_flag_no("sharecache",	Opt_sharecache),
	fsparam_flag  ("sloppy",	Opt_sloppy),
	fsparam_flag  ("soft",		Opt_soft),
	fsparam_flag  ("softerr",	Opt_softerr),
	fsparam_flag  ("softreval",	Opt_softreval),
	fsparam_string("source",	Opt_source),
	fsparam_flag  ("tcp",		Opt_tcp),
	fsparam_u32   ("timeo",		Opt_timeo),
	fsparam_flag_no("trunkdiscovery", Opt_trunkdiscovery),
	fsparam_flag  ("udp",		Opt_udp),
	fsparam_flag  ("v2",		Opt_v),
	fsparam_flag  ("v3",		Opt_v),
	fsparam_flag  ("v4",		Opt_v),
	fsparam_flag  ("v4.0",		Opt_v),
	fsparam_flag  ("v4.1",		Opt_v),
	fsparam_flag  ("v4.2",		Opt_v),
	fsparam_string("vers",		Opt_vers),
	fsparam_enum  ("write",		Opt_write, nfs_param_enums_write),
	fsparam_u32   ("wsize",		Opt_wsize),
	{}
};

enum {
	Opt_vers_2,
	Opt_vers_3,
	Opt_vers_4,
	Opt_vers_4_0,
	Opt_vers_4_1,
	Opt_vers_4_2,
};

static const struct constant_table nfs_vers_tokens[] = {
	{ "2",		Opt_vers_2 },
	{ "3",		Opt_vers_3 },
	{ "4",		Opt_vers_4 },
	{ "4.0",	Opt_vers_4_0 },
	{ "4.1",	Opt_vers_4_1 },
	{ "4.2",	Opt_vers_4_2 },
	{}
};

enum {
	Opt_xprt_rdma,
	Opt_xp