blob: 2f8a29db0f1bed59a8300d64038ebe4404d611a6 [file] [log] [blame]
David Howellsf7b422b2006-06-09 09:34:33 -04001/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
Alan Cox526719b2008-10-27 15:19:48 +00008 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
David Howellsf7b422b2006-06-09 09:34:33 -04009 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
David Howells54ceac42006-08-22 20:06:13 -040016 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
David Howellsf7b422b2006-06-09 09:34:33 -040021 */
22
David Howellsf7b422b2006-06-09 09:34:33 -040023#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
Jeff Layton59766872013-02-04 12:50:00 -050034#include <linux/sunrpc/addr.h>
David Howellsf7b422b2006-06-09 09:34:33 -040035#include <linux/sunrpc/stats.h>
36#include <linux/sunrpc/metrics.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040037#include <linux/sunrpc/xprtsock.h>
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040038#include <linux/sunrpc/xprtrdma.h>
David Howellsf7b422b2006-06-09 09:34:33 -040039#include <linux/nfs_fs.h>
40#include <linux/nfs_mount.h>
41#include <linux/nfs4_mount.h>
42#include <linux/lockd/bind.h>
David Howellsf7b422b2006-06-09 09:34:33 -040043#include <linux/seq_file.h>
44#include <linux/mount.h>
Trond Myklebustc02d7ad2009-06-22 15:09:14 -040045#include <linux/namei.h>
David Howellsf7b422b2006-06-09 09:34:33 -040046#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050049#include <linux/in6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090050#include <linux/slab.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050051#include <net/ipv6.h>
Chuck Leverd8e77482008-06-23 12:37:01 -040052#include <linux/netdevice.h>
David Howellsf7b422b2006-06-09 09:34:33 -040053#include <linux/nfs_xdr.h>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080054#include <linux/magic.h>
Chuck Leverbf0fd762007-07-01 12:13:44 -040055#include <linux/parser.h>
Stanislav Kinsburskye50a7a12012-01-10 16:12:46 +040056#include <linux/nsproxy.h>
Trond Myklebust2446ab62012-03-01 17:00:56 -050057#include <linux/rcupdate.h>
David Howellsf7b422b2006-06-09 09:34:33 -040058
David Howellsf7b422b2006-06-09 09:34:33 -040059#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
David Howells08734042009-04-03 16:42:42 +010066#include "fscache.h"
Trond Myklebust76e697b2012-11-26 14:20:49 -050067#include "nfs4session.h"
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +030068#include "pnfs.h"
Bryan Schumakerab7017a2012-07-30 16:05:16 -040069#include "nfs.h"
David Howellsf7b422b2006-06-09 09:34:33 -040070
71#define NFSDBG_FACILITY NFSDBG_VFS
Bryan Schumakerb72e4f42012-05-10 15:07:40 -040072#define NFS_TEXT_DATA 1
David Howellsf7b422b2006-06-09 09:34:33 -040073
Bryan Schumaker1c606fb2012-07-30 16:05:24 -040074#if IS_ENABLED(CONFIG_NFS_V3)
Paulius Zaleckas1e657bd2010-10-31 18:21:05 +020075#define NFS_DEFAULT_VERSION 3
76#else
77#define NFS_DEFAULT_VERSION 2
78#endif
79
Chuck Leverbf0fd762007-07-01 12:13:44 -040080enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
Chuck Leverbf0fd762007-07-01 12:13:44 -040083 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040087 Opt_udp, Opt_tcp, Opt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -040088 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
Trond Myklebust75180df2007-05-16 16:53:28 -040090 Opt_sharecache, Opt_nosharecache,
Chuck Leverd7403512008-12-23 15:21:37 -050091 Opt_resvport, Opt_noresvport,
David Howellsb797cac2009-04-03 16:42:48 +010092 Opt_fscache, Opt_nofscache,
Chuck Lever89652612012-09-14 17:24:11 -040093 Opt_migration, Opt_nomigration,
Chuck Leverbf0fd762007-07-01 12:13:44 -040094
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
Chuck Levere887cbc2007-10-26 13:32:29 -0400104 Opt_mountvers,
Mike Sager3fd5be92009-04-01 09:21:48 -0400105 Opt_minorversion,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400106
107 /* Mount options that take string arguments */
Trond Myklebust0d71b052012-03-02 13:59:49 -0500108 Opt_nfsvers,
Chuck Lever33832032007-12-10 14:59:13 -0500109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
Chuck Lever0ac83772007-09-11 18:01:04 -0400110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
Trond Myklebust7973c1f12008-07-15 17:58:14 -0400111 Opt_lookupcache,
David Howellsb797cac2009-04-03 16:42:48 +0100112 Opt_fscache_uniq,
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400113 Opt_local_lock,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400114
Chuck Leverf45663c2008-06-24 19:28:02 -0400115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400117
118 Opt_err
119};
120
Steven Whitehousea447c092008-10-13 10:46:57 +0100121static const match_table_t nfs_mount_option_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
Chuck Leverecbb3842008-06-12 12:37:33 -0400124 { Opt_userspace, "retry=%s" },
125
Chuck Leverf45663c2008-06-24 19:28:02 -0400126 { Opt_sloppy, "sloppy" },
127
Chuck Leverbf0fd762007-07-01 12:13:44 -0400128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
Chuck Leverd33e4df2008-06-12 12:37:41 -0400130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400142 { Opt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
Trond Myklebust75180df2007-05-16 16:53:28 -0400147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
Chuck Leverd7403512008-12-23 15:21:37 -0500149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
David Howellsb797cac2009-04-03 16:42:48 +0100151 { Opt_fscache, "fsc" },
David Howellsb797cac2009-04-03 16:42:48 +0100152 { Opt_nofscache, "nofsc" },
Chuck Lever89652612012-09-14 17:24:11 -0400153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400155
Chuck Levera5a16ba2009-06-17 18:02:14 -0700156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
Trond Myklebust0d71b052012-03-02 13:59:49 -0500170 { Opt_minorversion, "minorversion=%s" },
171
Chuck Levera5a16ba2009-06-17 18:02:14 -0700172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
Chuck Lever33832032007-12-10 14:59:13 -0500180 { Opt_mounthost, "mounthost=%s" },
Chuck Lever0ac83772007-09-11 18:01:04 -0400181 { Opt_mountaddr, "mountaddr=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400182
Trond Myklebust7973c1f12008-07-15 17:58:14 -0400183 { Opt_lookupcache, "lookupcache=%s" },
Chuck Levera6d5ff62010-05-07 13:33:58 -0400184 { Opt_fscache_uniq, "fsc=%s" },
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400185 { Opt_local_lock, "local_lock=%s" },
Trond Myklebust7973c1f12008-07-15 17:58:14 -0400186
Trond Myklebust38622792012-03-02 14:06:39 -0500187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
Chuck Leverbf0fd762007-07-01 12:13:44 -0400190 { Opt_err, NULL }
191};
192
193enum {
Jeff Laytonee671b02009-12-03 15:58:56 -0500194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400195
196 Opt_xprt_err
197};
198
Steven Whitehousea447c092008-10-13 10:46:57 +0100199static const match_table_t nfs_xprt_protocol_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400200 { Opt_xprt_udp, "udp" },
Jeff Laytonee671b02009-12-03 15:58:56 -0500201 { Opt_xprt_udp6, "udp6" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400202 { Opt_xprt_tcp, "tcp" },
Jeff Laytonee671b02009-12-03 15:58:56 -0500203 { Opt_xprt_tcp6, "tcp6" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400204 { Opt_xprt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400205
206 { Opt_xprt_err, NULL }
207};
208
209enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216};
217
Steven Whitehousea447c092008-10-13 10:46:57 +0100218static const match_table_t nfs_secflavor_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
Olga Kornievskaia8d042212008-02-13 16:47:06 -0500231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
Chuck Leverbf0fd762007-07-01 12:13:44 -0400235 { Opt_sec_err, NULL }
236};
237
Trond Myklebust7973c1f12008-07-15 17:58:14 -0400238enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243};
244
245static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252};
253
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400254enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259};
260
261static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268};
269
Trond Myklebust0d71b052012-03-02 13:59:49 -0500270enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1,
273
274 Opt_vers_err
275};
276
277static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283
284 { Opt_vers_err, NULL }
285};
Chuck Leverbf0fd762007-07-01 12:13:44 -0400286
Al Viro31f43472010-10-29 03:38:12 -0400287static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
David Howellsf7b422b2006-06-09 09:34:33 -0400289
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400290struct file_system_type nfs_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400291 .owner = THIS_MODULE,
292 .name = "nfs",
Al Viro01194982011-03-16 07:25:36 -0400293 .mount = nfs_fs_mount,
David Howellsf7b422b2006-06-09 09:34:33 -0400294 .kill_sb = nfs_kill_super,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400296};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800297MODULE_ALIAS_FS("nfs");
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400298EXPORT_SYMBOL_GPL(nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400299
David Howells54ceac42006-08-22 20:06:13 -0400300struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400301 .owner = THIS_MODULE,
302 .name = "nfs",
Al Viro31f43472010-10-29 03:38:12 -0400303 .mount = nfs_xdev_mount,
David Howellsf7b422b2006-06-09 09:34:33 -0400304 .kill_sb = nfs_kill_super,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400306};
307
Bryan Schumaker6a744902012-07-30 16:05:20 -0400308const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400309 .alloc_inode = nfs_alloc_inode,
310 .destroy_inode = nfs_destroy_inode,
311 .write_inode = nfs_write_inode,
Trond Myklebusteed99352012-12-14 14:36:36 -0500312 .drop_inode = nfs_drop_inode,
Trond Myklebust387c1492010-02-03 08:27:35 -0500313 .put_super = nfs_put_super,
David Howellsf7b422b2006-06-09 09:34:33 -0400314 .statfs = nfs_statfs,
Al Virob57922d2010-06-07 14:34:48 -0400315 .evict_inode = nfs_evict_inode,
David Howellsf7b422b2006-06-09 09:34:33 -0400316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
Al Viroc7f404b2011-03-16 06:59:40 -0400318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
David Howellsf7b422b2006-06-09 09:34:33 -0400320 .show_stats = nfs_show_stats,
Jeff Layton48b605f2008-06-10 15:38:39 -0400321 .remount_fs = nfs_remount,
David Howellsf7b422b2006-06-09 09:34:33 -0400322};
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400323EXPORT_SYMBOL_GPL(nfs_sops);
David Howellsf7b422b2006-06-09 09:34:33 -0400324
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400325#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400326static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
Bryan Schumakerd72c7272012-05-10 15:07:41 -0400327static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400329
330struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
332 .name = "nfs4",
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400336};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800337MODULE_ALIAS_FS("nfs4");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700338MODULE_ALIAS("nfs4");
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400339EXPORT_SYMBOL_GPL(nfs4_fs_type);
340
341static int __init register_nfs4_fs(void)
342{
343 return register_filesystem(&nfs4_fs_type);
344}
345
346static void unregister_nfs4_fs(void)
347{
348 unregister_filesystem(&nfs4_fs_type);
349}
350#else
351static int __init register_nfs4_fs(void)
352{
353 return 0;
354}
355
356static void unregister_nfs4_fs(void)
357{
358}
David Howellsf7b422b2006-06-09 09:34:33 -0400359#endif
360
Rusty Russell8e1f9362007-07-17 04:03:17 -0700361static struct shrinker acl_shrinker = {
362 .shrink = nfs_access_cache_shrinker,
363 .seeks = DEFAULT_SEEKS,
364};
Trond Myklebust979df722006-07-25 11:28:19 -0400365
David Howellsf7b422b2006-06-09 09:34:33 -0400366/*
367 * Register the NFS filesystems
368 */
369int __init register_nfs_fs(void)
370{
371 int ret;
372
373 ret = register_filesystem(&nfs_fs_type);
374 if (ret < 0)
375 goto error_0;
376
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400377 ret = register_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400378 if (ret < 0)
379 goto error_1;
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400380
381 ret = nfs_register_sysctl();
382 if (ret < 0)
383 goto error_2;
Rusty Russell8e1f9362007-07-17 04:03:17 -0700384 register_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400385 return 0;
386
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400387error_2:
388 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400389error_1:
390 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400391error_0:
392 return ret;
393}
394
395/*
396 * Unregister the NFS filesystems
397 */
398void __exit unregister_nfs_fs(void)
399{
Rusty Russell8e1f9362007-07-17 04:03:17 -0700400 unregister_shrinker(&acl_shrinker);
Alexey Dobriyan49af7ee2007-09-18 22:46:40 -0700401 nfs_unregister_sysctl();
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400402 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400403 unregister_filesystem(&nfs_fs_type);
404}
405
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400406void nfs_sb_active(struct super_block *sb)
Steve Dicksonef818a22007-11-08 04:05:04 -0500407{
408 struct nfs_server *server = NFS_SB(sb);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400409
410 if (atomic_inc_return(&server->active) == 1)
411 atomic_inc(&sb->s_active);
412}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400413EXPORT_SYMBOL_GPL(nfs_sb_active);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400414
415void nfs_sb_deactive(struct super_block *sb)
416{
417 struct nfs_server *server = NFS_SB(sb);
418
419 if (atomic_dec_and_test(&server->active))
420 deactivate_super(sb);
Steve Dicksonef818a22007-11-08 04:05:04 -0500421}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400422EXPORT_SYMBOL_GPL(nfs_sb_deactive);
Steve Dicksonef818a22007-11-08 04:05:04 -0500423
David Howellsf7b422b2006-06-09 09:34:33 -0400424/*
425 * Deliver file system statistics to userspace
426 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400427int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400428{
David Howells0c7d90c2006-08-22 20:06:10 -0400429 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400430 unsigned char blockbits;
431 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400432 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400433 struct nfs_fsstat res;
434 int error = -ENOMEM;
435
436 res.fattr = nfs_alloc_fattr();
437 if (res.fattr == NULL)
438 goto out_err;
David Howellsf7b422b2006-06-09 09:34:33 -0400439
David Howells8fa5c002006-08-22 20:06:12 -0400440 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400441 if (unlikely(error == -ESTALE)) {
442 struct dentry *pd_dentry;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400443
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400444 pd_dentry = dget_parent(dentry);
445 if (pd_dentry != NULL) {
446 nfs_zap_caches(pd_dentry->d_inode);
447 dput(pd_dentry);
448 }
449 }
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400450 nfs_free_fattr(res.fattr);
David Howellsf7b422b2006-06-09 09:34:33 -0400451 if (error < 0)
452 goto out_err;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400453
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700454 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400455
456 /*
457 * Current versions of glibc do not correctly handle the
458 * case where f_frsize != f_bsize. Eventually we want to
459 * report the value of wtmult in this field.
460 */
David Howells0c7d90c2006-08-22 20:06:10 -0400461 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400462
463 /*
464 * On most *nix systems, f_blocks, f_bfree, and f_bavail
465 * are reported in units of f_frsize. Linux hasn't had
466 * an f_frsize field in its statfs struct until recently,
467 * thus historically Linux's sys_statfs reports these
468 * fields in units of f_bsize.
469 */
David Howells0c7d90c2006-08-22 20:06:10 -0400470 buf->f_bsize = dentry->d_sb->s_blocksize;
471 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400472 blockres = (1 << blockbits) - 1;
473 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
474 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
475 buf->f_bavail = (res.abytes + blockres) >> blockbits;
476
477 buf->f_files = res.tfiles;
478 buf->f_ffree = res.afiles;
479
480 buf->f_namelen = server->namelen;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700481
David Howellsf7b422b2006-06-09 09:34:33 -0400482 return 0;
483
484 out_err:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700485 dprintk("%s: statfs error = %d\n", __func__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700486 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400487}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400488EXPORT_SYMBOL_GPL(nfs_statfs);
David Howellsf7b422b2006-06-09 09:34:33 -0400489
David Howells7d4e2742006-08-22 20:06:07 -0400490/*
491 * Map the security flavour number to a name
492 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400493static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
494{
David Howells7d4e2742006-08-22 20:06:07 -0400495 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400496 rpc_authflavor_t flavour;
497 const char *str;
498 } sec_flavours[] = {
499 { RPC_AUTH_NULL, "null" },
500 { RPC_AUTH_UNIX, "sys" },
501 { RPC_AUTH_GSS_KRB5, "krb5" },
502 { RPC_AUTH_GSS_KRB5I, "krb5i" },
503 { RPC_AUTH_GSS_KRB5P, "krb5p" },
504 { RPC_AUTH_GSS_LKEY, "lkey" },
505 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
506 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
507 { RPC_AUTH_GSS_SPKM, "spkm" },
508 { RPC_AUTH_GSS_SPKMI, "spkmi" },
509 { RPC_AUTH_GSS_SPKMP, "spkmp" },
Chuck Lever4d81cd12007-07-01 12:12:40 -0400510 { UINT_MAX, "unknown" }
Trond Myklebust81039f12006-06-09 09:34:34 -0400511 };
512 int i;
513
Chuck Lever4d81cd12007-07-01 12:12:40 -0400514 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
Trond Myklebust81039f12006-06-09 09:34:34 -0400515 if (sec_flavours[i].flavour == flavour)
516 break;
517 }
518 return sec_flavours[i].str;
519}
520
Jeff Laytonee671b02009-12-03 15:58:56 -0500521static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
522 int showdefaults)
523{
524 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
525
526 seq_printf(m, ",mountproto=");
527 switch (sap->sa_family) {
528 case AF_INET:
529 switch (nfss->mountd_protocol) {
530 case IPPROTO_UDP:
531 seq_printf(m, RPCBIND_NETID_UDP);
532 break;
533 case IPPROTO_TCP:
534 seq_printf(m, RPCBIND_NETID_TCP);
535 break;
536 default:
537 if (showdefaults)
538 seq_printf(m, "auto");
539 }
540 break;
541 case AF_INET6:
542 switch (nfss->mountd_protocol) {
543 case IPPROTO_UDP:
544 seq_printf(m, RPCBIND_NETID_UDP6);
545 break;
546 case IPPROTO_TCP:
547 seq_printf(m, RPCBIND_NETID_TCP6);
548 break;
549 default:
550 if (showdefaults)
551 seq_printf(m, "auto");
552 }
553 break;
554 default:
555 if (showdefaults)
556 seq_printf(m, "auto");
557 }
558}
559
Chuck Lever82d101d2008-03-14 14:10:37 -0400560static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
561 int showdefaults)
562{
563 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
564
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -0400565 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
566 return;
567
Chuck Lever82d101d2008-03-14 14:10:37 -0400568 switch (sap->sa_family) {
569 case AF_INET: {
570 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
Harvey Harrisonbe859402008-10-31 00:56:28 -0700571 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400572 break;
573 }
574 case AF_INET6: {
575 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
Chuck Leverd250e192009-12-03 15:58:56 -0500576 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400577 break;
578 }
579 default:
580 if (showdefaults)
581 seq_printf(m, ",mountaddr=unspecified");
582 }
583
584 if (nfss->mountd_version || showdefaults)
585 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
Stanislav Kinsburskyaa699472010-12-08 12:40:13 +0300586 if ((nfss->mountd_port &&
587 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
588 showdefaults)
Chuck Lever82d101d2008-03-14 14:10:37 -0400589 seq_printf(m, ",mountport=%u", nfss->mountd_port);
590
Jeff Laytonee671b02009-12-03 15:58:56 -0500591 nfs_show_mountd_netid(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400592}
593
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400594#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust0be81892010-06-18 12:23:58 -0400595static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
596 int showdefaults)
597{
598 struct nfs_client *clp = nfss->nfs_client;
599
600 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
Trond Myklebust0be81892010-06-18 12:23:58 -0400601}
602#else
603static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605{
606}
607#endif
608
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500609static void nfs_show_nfs_version(struct seq_file *m,
610 unsigned int version,
611 unsigned int minorversion)
612{
613 seq_printf(m, ",vers=%u", version);
614 if (version == 4)
615 seq_printf(m, ".%u", minorversion);
616}
617
David Howellsf7b422b2006-06-09 09:34:33 -0400618/*
619 * Describe the mount options in force on this server representation
620 */
Chuck Lever82d101d2008-03-14 14:10:37 -0400621static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
622 int showdefaults)
David Howellsf7b422b2006-06-09 09:34:33 -0400623{
David Howells509de812006-08-22 20:06:11 -0400624 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400625 int flag;
David Howells509de812006-08-22 20:06:11 -0400626 const char *str;
627 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400628 } nfs_info[] = {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
Chuck Lever82d101d2008-03-14 14:10:37 -0400630 { NFS_MOUNT_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Chuck Leverd7403512008-12-23 15:21:37 -0500636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400638 { 0, NULL, NULL }
639 };
David Howells509de812006-08-22 20:06:11 -0400640 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400641 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400642 u32 version = clp->rpc_ops->version;
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400643 int local_flock, local_fcntl;
David Howellsf7b422b2006-06-09 09:34:33 -0400644
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500645 nfs_show_nfs_version(m, version, clp->cl_minorversion);
Chuck Lever2d767432008-03-14 14:10:08 -0400646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
662 else
663 seq_puts(m, nfs_infop->nostr);
664 }
Trond Myklebust2446ab62012-03-01 17:00:56 -0500665 rcu_read_lock();
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400666 seq_printf(m, ",proto=%s",
Jeff Laytonee671b02009-12-03 15:58:56 -0500667 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500668 rcu_read_unlock();
Chuck Lever82d101d2008-03-14 14:10:37 -0400669 if (version == 4) {
670 if (nfss->port != NFS_PORT)
671 seq_printf(m, ",port=%u", nfss->port);
672 } else
673 if (nfss->port)
674 seq_printf(m, ",port=%u", nfss->port);
675
Trond Myklebust33170232007-12-20 16:03:59 -0500676 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
677 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400678 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400679
680 if (version != 4)
681 nfs_show_mountd_options(m, nfss, showdefaults);
Trond Myklebust0be81892010-06-18 12:23:58 -0400682 else
683 nfs_show_nfsv4_options(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400684
David Howellsb797cac2009-04-03 16:42:48 +0100685 if (nfss->options & NFS_OPTION_FSCACHE)
686 seq_printf(m, ",fsc");
Patrick J. LoPresti9b00c642010-08-10 17:28:01 -0400687
Chuck Lever89652612012-09-14 17:24:11 -0400688 if (nfss->options & NFS_OPTION_MIGRATION)
689 seq_printf(m, ",migration");
690
Patrick J. LoPresti9b00c642010-08-10 17:28:01 -0400691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
693 seq_printf(m, ",lookupcache=none");
694 else
695 seq_printf(m, ",lookupcache=pos");
696 }
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400697
698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
700
701 if (!local_flock && !local_fcntl)
702 seq_printf(m, ",local_lock=none");
703 else if (local_flock && local_fcntl)
704 seq_printf(m, ",local_lock=all");
705 else if (local_flock)
706 seq_printf(m, ",local_lock=flock");
707 else
708 seq_printf(m, ",local_lock=posix");
David Howellsf7b422b2006-06-09 09:34:33 -0400709}
710
711/*
712 * Describe the mount options on this VFS mountpoint
713 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400714int nfs_show_options(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400715{
Al Viro34c80b12011-12-08 21:32:45 -0500716 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400717
718 nfs_show_mount_options(m, nfss, 0);
719
Trond Myklebust2446ab62012-03-01 17:00:56 -0500720 rcu_read_lock();
Chuck Lever5d8515c2007-12-10 14:57:16 -0500721 seq_printf(m, ",addr=%s",
722 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
723 RPC_DISPLAY_ADDR));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500724 rcu_read_unlock();
David Howellsf7b422b2006-06-09 09:34:33 -0400725
726 return 0;
727}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400728EXPORT_SYMBOL_GPL(nfs_show_options);
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700729
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400730#if IS_ENABLED(CONFIG_NFS_V4)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300731#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700732static void show_sessions(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300733{
734 if (nfs4_has_session(server->nfs_client))
735 seq_printf(m, ",sessions");
736}
737#else
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700738static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
739#endif
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300740#endif
741
742#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700743static void show_pnfs(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300744{
745 seq_printf(m, ",pnfs=");
746 if (server->pnfs_curr_ld)
747 seq_printf(m, "%s", server->pnfs_curr_ld->name);
748 else
749 seq_printf(m, "not configured");
750}
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500751
752static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
753{
Chuck Lever59155542012-05-21 22:44:41 -0400754 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
755 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500756 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
757 "date='%llu,%u'",
758 impl_id->name, impl_id->domain,
759 impl_id->date.seconds, impl_id->date.nseconds);
760 }
761}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700762#else
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400763#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500764static void show_pnfs(struct seq_file *m, struct nfs_server *server)
765{
766}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700767#endif
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500768static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
769{
770}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700771#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400772
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400773int nfs_show_devname(struct seq_file *m, struct dentry *root)
Al Viroc7f404b2011-03-16 06:59:40 -0400774{
775 char *page = (char *) __get_free_page(GFP_KERNEL);
776 char *devname, *dummy;
777 int err = 0;
778 if (!page)
779 return -ENOMEM;
Ben Hutchings97a54862012-10-21 19:23:52 +0100780 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
Al Viroc7f404b2011-03-16 06:59:40 -0400781 if (IS_ERR(devname))
782 err = PTR_ERR(devname);
783 else
784 seq_escape(m, devname, " \t\n\\");
785 free_page((unsigned long)page);
786 return err;
787}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400788EXPORT_SYMBOL_GPL(nfs_show_devname);
Al Viroc7f404b2011-03-16 06:59:40 -0400789
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400790int nfs_show_path(struct seq_file *m, struct dentry *dentry)
Al Viroc7f404b2011-03-16 06:59:40 -0400791{
792 seq_puts(m, "/");
793 return 0;
794}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400795EXPORT_SYMBOL_GPL(nfs_show_path);
Al Viroc7f404b2011-03-16 06:59:40 -0400796
David Howellsf7b422b2006-06-09 09:34:33 -0400797/*
798 * Present statistical information for this VFS mountpoint
799 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400800int nfs_show_stats(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400801{
802 int i, cpu;
Al Viro64132372011-12-08 20:51:13 -0500803 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400804 struct rpc_auth *auth = nfss->client->cl_auth;
805 struct nfs_iostats totals = { };
806
807 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
808
809 /*
810 * Display all mount option settings
811 */
812 seq_printf(m, "\n\topts:\t");
Al Viro64132372011-12-08 20:51:13 -0500813 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
814 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
815 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
816 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
David Howellsf7b422b2006-06-09 09:34:33 -0400817 nfs_show_mount_options(m, nfss, 1);
818
819 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
820
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500821 show_implementation_id(m, nfss);
Weston Andros Adamson7d2ed9a2012-02-17 15:20:26 -0500822
David Howellsf7b422b2006-06-09 09:34:33 -0400823 seq_printf(m, "\n\tcaps:\t");
824 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400825 seq_printf(m, ",wtmult=%u", nfss->wtmult);
826 seq_printf(m, ",dtsize=%u", nfss->dtsize);
827 seq_printf(m, ",bsize=%u", nfss->bsize);
828 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400829
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400830#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust40c553192007-12-14 14:56:07 -0500831 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400832 seq_printf(m, "\n\tnfsv4:\t");
833 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
834 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
835 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300836 show_sessions(m, nfss);
837 show_pnfs(m, nfss);
David Howellsf7b422b2006-06-09 09:34:33 -0400838 }
839#endif
840
841 /*
842 * Display security flavor in effect for this mount
843 */
Chuck Lever2d767432008-03-14 14:10:08 -0400844 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400845 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400846 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400847
848 /*
849 * Display superblock I/O counters
850 */
851 for_each_possible_cpu(cpu) {
852 struct nfs_iostats *stats;
853
854 preempt_disable();
855 stats = per_cpu_ptr(nfss->io_stats, cpu);
856
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 totals.events[i] += stats->events[i];
859 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
860 totals.bytes[i] += stats->bytes[i];
David Howells6a510912009-04-03 16:42:43 +0100861#ifdef CONFIG_NFS_FSCACHE
862 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
863 totals.fscache[i] += stats->fscache[i];
864#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400865
866 preempt_enable();
867 }
868
869 seq_printf(m, "\n\tevents:\t");
870 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
871 seq_printf(m, "%lu ", totals.events[i]);
872 seq_printf(m, "\n\tbytes:\t");
873 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
874 seq_printf(m, "%Lu ", totals.bytes[i]);
David Howells6a510912009-04-03 16:42:43 +0100875#ifdef CONFIG_NFS_FSCACHE
876 if (nfss->options & NFS_OPTION_FSCACHE) {
877 seq_printf(m, "\n\tfsc:\t");
878 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
879 seq_printf(m, "%Lu ", totals.bytes[i]);
880 }
881#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400882 seq_printf(m, "\n");
883
884 rpc_print_iostats(m, nfss->client);
885
886 return 0;
887}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400888EXPORT_SYMBOL_GPL(nfs_show_stats);
David Howellsf7b422b2006-06-09 09:34:33 -0400889
890/*
891 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400892 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400893 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400894void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400895{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200896 struct nfs_server *server;
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400897 struct rpc_clnt *rpc;
898
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200899 server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400900 /* -EIO all pending I/O */
901 rpc = server->client_acl;
902 if (!IS_ERR(rpc))
903 rpc_killall_tasks(rpc);
904 rpc = server->client;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
David Howellsf7b422b2006-06-09 09:34:33 -0400907}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400908EXPORT_SYMBOL_GPL(nfs_umount_begin);
David Howellsf7b422b2006-06-09 09:34:33 -0400909
Bryan Schumakerdb833352012-05-10 15:07:38 -0400910static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
Chuck Lever9423a082009-09-23 14:36:38 -0400911{
912 struct nfs_parsed_mount_data *data;
913
914 data = kzalloc(sizeof(*data), GFP_KERNEL);
915 if (data) {
Chuck Lever9423a082009-09-23 14:36:38 -0400916 data->acregmin = NFS_DEF_ACREGMIN;
917 data->acregmax = NFS_DEF_ACREGMAX;
918 data->acdirmin = NFS_DEF_ACDIRMIN;
919 data->acdirmax = NFS_DEF_ACDIRMAX;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400920 data->mount_server.port = NFS_UNSPEC_PORT;
Chuck Lever9423a082009-09-23 14:36:38 -0400921 data->nfs_server.port = NFS_UNSPEC_PORT;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400922 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Lever9423a082009-09-23 14:36:38 -0400923 data->auth_flavors[0] = RPC_AUTH_UNIX;
924 data->auth_flavor_len = 1;
925 data->minorversion = 0;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400926 data->need_mount = true;
Trond Myklebust9937347a2012-02-19 08:44:07 +0100927 data->net = current->nsproxy->net_ns;
Jeff Layton8a0d5512011-12-20 06:57:45 -0500928 security_init_mnt_opts(&data->lsm_opts);
Chuck Lever9423a082009-09-23 14:36:38 -0400929 }
930 return data;
931}
932
Jeff Layton8a0d5512011-12-20 06:57:45 -0500933static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
934{
935 if (data) {
936 kfree(data->client_address);
937 kfree(data->mount_server.hostname);
938 kfree(data->nfs_server.export_path);
939 kfree(data->nfs_server.hostname);
940 kfree(data->fscache_uniq);
941 security_free_mnt_opts(&data->lsm_opts);
942 kfree(data);
943 }
944}
945
David Howellsf7b422b2006-06-09 09:34:33 -0400946/*
Chuck Levercdcd7f92007-12-10 14:57:45 -0500947 * Sanity-check a server address provided by the mount command.
948 *
949 * Address family must be initialized, and address must not be
950 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400951 */
952static int nfs_verify_server_address(struct sockaddr *addr)
953{
954 switch (addr->sa_family) {
955 case AF_INET: {
Chuck Levercdcd7f92007-12-10 14:57:45 -0500956 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700957 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f92007-12-10 14:57:45 -0500958 }
959 case AF_INET6: {
960 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
961 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -0400962 }
963 }
964
Chuck Lever53a0b9c2009-08-09 15:09:36 -0400965 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
Chuck Leverfc50d582007-07-01 12:12:46 -0400966 return 0;
967}
968
Chuck Lever9412b922007-12-10 14:59:21 -0500969/*
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400970 * Select between a default port value and a user-specified port value.
971 * If a zero value is set, then autobind will be used.
972 */
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400973static void nfs_set_port(struct sockaddr *sap, int *port,
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400974 const unsigned short default_port)
975{
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400976 if (*port == NFS_UNSPEC_PORT)
977 *port = default_port;
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400978
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400979 rpc_set_port(sap, *port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400980}
981
982/*
Trond Myklebust259875e2008-07-02 14:43:47 -0400983 * Sanity check the NFS transport protocol.
984 *
985 */
986static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
987{
988 switch (mnt->nfs_server.protocol) {
989 case XPRT_TRANSPORT_UDP:
990 case XPRT_TRANSPORT_TCP:
991 case XPRT_TRANSPORT_RDMA:
992 break;
993 default:
994 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
995 }
996}
997
998/*
999 * For text based NFSv2/v3 mounts, the mount protocol transport default
1000 * settings should depend upon the specified NFS transport.
1001 */
1002static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1003{
1004 nfs_validate_transport_protocol(mnt);
1005
1006 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1007 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1008 return;
1009 switch (mnt->nfs_server.protocol) {
1010 case XPRT_TRANSPORT_UDP:
1011 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1012 break;
1013 case XPRT_TRANSPORT_TCP:
1014 case XPRT_TRANSPORT_RDMA:
1015 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1016 }
1017}
1018
1019/*
Chuck Lever01060c82008-06-24 16:33:38 -04001020 * Parse the value of the 'sec=' option.
Chuck Lever01060c82008-06-24 16:33:38 -04001021 */
1022static int nfs_parse_security_flavors(char *value,
1023 struct nfs_parsed_mount_data *mnt)
1024{
1025 substring_t args[MAX_OPT_ARGS];
1026
1027 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1028
1029 switch (match_token(value, nfs_secflavor_tokens, args)) {
1030 case Opt_sec_none:
Chuck Lever01060c82008-06-24 16:33:38 -04001031 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1032 break;
1033 case Opt_sec_sys:
Chuck Lever01060c82008-06-24 16:33:38 -04001034 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1035 break;
1036 case Opt_sec_krb5:
Chuck Lever01060c82008-06-24 16:33:38 -04001037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1038 break;
1039 case Opt_sec_krb5i:
Chuck Lever01060c82008-06-24 16:33:38 -04001040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1041 break;
1042 case Opt_sec_krb5p:
Chuck Lever01060c82008-06-24 16:33:38 -04001043 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1044 break;
1045 case Opt_sec_lkey:
Chuck Lever01060c82008-06-24 16:33:38 -04001046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1047 break;
1048 case Opt_sec_lkeyi:
Chuck Lever01060c82008-06-24 16:33:38 -04001049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1050 break;
1051 case Opt_sec_lkeyp:
Chuck Lever01060c82008-06-24 16:33:38 -04001052 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1053 break;
1054 case Opt_sec_spkm:
Chuck Lever01060c82008-06-24 16:33:38 -04001055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1056 break;
1057 case Opt_sec_spkmi:
Chuck Lever01060c82008-06-24 16:33:38 -04001058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1059 break;
1060 case Opt_sec_spkmp:
Chuck Lever01060c82008-06-24 16:33:38 -04001061 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1062 break;
1063 default:
1064 return 0;
1065 }
1066
Bryan Schumaker9b7160c2011-04-13 14:31:30 -04001067 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
Chuck Lever059f90b2009-08-09 15:09:31 -04001068 mnt->auth_flavor_len = 1;
Chuck Lever01060c82008-06-24 16:33:38 -04001069 return 1;
1070}
1071
Trond Myklebust0d71b052012-03-02 13:59:49 -05001072static int nfs_parse_version_string(char *string,
1073 struct nfs_parsed_mount_data *mnt,
1074 substring_t *args)
1075{
1076 mnt->flags &= ~NFS_MOUNT_VER3;
1077 switch (match_token(string, nfs_vers_tokens, args)) {
1078 case Opt_vers_2:
1079 mnt->version = 2;
1080 break;
1081 case Opt_vers_3:
1082 mnt->flags |= NFS_MOUNT_VER3;
1083 mnt->version = 3;
1084 break;
1085 case Opt_vers_4:
1086 /* Backward compatibility option. In future,
1087 * the mount program should always supply
1088 * a NFSv4 minor version number.
1089 */
1090 mnt->version = 4;
1091 break;
1092 case Opt_vers_4_0:
1093 mnt->version = 4;
1094 mnt->minorversion = 0;
1095 break;
1096 case Opt_vers_4_1:
1097 mnt->version = 4;
1098 mnt->minorversion = 1;
1099 break;
1100 default:
1101 return 0;
1102 }
1103 return 1;
1104}
1105
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001106static int nfs_get_option_str(substring_t args[], char **option)
1107{
1108 kfree(*option);
1109 *option = match_strdup(args);
Xi Wange25fbe32013-01-04 03:22:57 -05001110 return !*option;
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001111}
1112
1113static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1114{
1115 int rc;
1116 char *string;
1117
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 return -ENOMEM;
Daniel Walter7297cb62012-09-26 21:51:46 +02001121 rc = kstrtoul(string, 10, option);
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001122 kfree(string);
1123
1124 return rc;
1125}
1126
Chuck Lever01060c82008-06-24 16:33:38 -04001127/*
Chuck Leverbf0fd762007-07-01 12:13:44 -04001128 * Error-check and convert a string of mount options from user space into
Chuck Leverf45663c2008-06-24 19:28:02 -04001129 * a data structure. The whole mount string is processed; bad options are
1130 * skipped as they are encountered. If there were no errors, return 1;
1131 * otherwise return 0 (zero).
Chuck Leverbf0fd762007-07-01 12:13:44 -04001132 */
1133static int nfs_parse_mount_options(char *raw,
1134 struct nfs_parsed_mount_data *mnt)
1135{
Eric Parisf9c3a382008-03-05 14:20:18 -05001136 char *p, *string, *secdata;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001137 int rc, sloppy = 0, invalid_option = 0;
Jeff Laytonee671b02009-12-03 15:58:56 -05001138 unsigned short protofamily = AF_UNSPEC;
1139 unsigned short mountfamily = AF_UNSPEC;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001140
1141 if (!raw) {
1142 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1143 return 1;
1144 }
1145 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1146
Eric Parisf9c3a382008-03-05 14:20:18 -05001147 secdata = alloc_secdata();
1148 if (!secdata)
1149 goto out_nomem;
1150
1151 rc = security_sb_copy_data(raw, secdata);
1152 if (rc)
1153 goto out_security_failure;
1154
1155 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1156 if (rc)
1157 goto out_security_failure;
1158
1159 free_secdata(secdata);
1160
Chuck Leverbf0fd762007-07-01 12:13:44 -04001161 while ((p = strsep(&raw, ",")) != NULL) {
1162 substring_t args[MAX_OPT_ARGS];
Chuck Levera5a16ba2009-06-17 18:02:14 -07001163 unsigned long option;
1164 int token;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001165
1166 if (!*p)
1167 continue;
1168
1169 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1170
1171 token = match_token(p, nfs_mount_option_tokens, args);
1172 switch (token) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001173
1174 /*
1175 * boolean options: foo/nofoo
1176 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001177 case Opt_soft:
1178 mnt->flags |= NFS_MOUNT_SOFT;
1179 break;
1180 case Opt_hard:
1181 mnt->flags &= ~NFS_MOUNT_SOFT;
1182 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001183 case Opt_posix:
1184 mnt->flags |= NFS_MOUNT_POSIX;
1185 break;
1186 case Opt_noposix:
1187 mnt->flags &= ~NFS_MOUNT_POSIX;
1188 break;
1189 case Opt_cto:
1190 mnt->flags &= ~NFS_MOUNT_NOCTO;
1191 break;
1192 case Opt_nocto:
1193 mnt->flags |= NFS_MOUNT_NOCTO;
1194 break;
1195 case Opt_ac:
1196 mnt->flags &= ~NFS_MOUNT_NOAC;
1197 break;
1198 case Opt_noac:
1199 mnt->flags |= NFS_MOUNT_NOAC;
1200 break;
1201 case Opt_lock:
1202 mnt->flags &= ~NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001203 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1204 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001205 break;
1206 case Opt_nolock:
1207 mnt->flags |= NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001208 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1209 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001210 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001211 case Opt_udp:
1212 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001213 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001214 break;
1215 case Opt_tcp:
1216 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001217 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001218 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001219 case Opt_rdma:
1220 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1221 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001222 xprt_load_transport(p);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001223 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001224 case Opt_acl:
1225 mnt->flags &= ~NFS_MOUNT_NOACL;
1226 break;
1227 case Opt_noacl:
1228 mnt->flags |= NFS_MOUNT_NOACL;
1229 break;
1230 case Opt_rdirplus:
1231 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1232 break;
1233 case Opt_nordirplus:
1234 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1235 break;
Trond Myklebust75180df2007-05-16 16:53:28 -04001236 case Opt_sharecache:
1237 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1238 break;
1239 case Opt_nosharecache:
1240 mnt->flags |= NFS_MOUNT_UNSHARED;
1241 break;
Chuck Leverd7403512008-12-23 15:21:37 -05001242 case Opt_resvport:
1243 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1244 break;
1245 case Opt_noresvport:
1246 mnt->flags |= NFS_MOUNT_NORESVPORT;
1247 break;
David Howellsb797cac2009-04-03 16:42:48 +01001248 case Opt_fscache:
1249 mnt->options |= NFS_OPTION_FSCACHE;
1250 kfree(mnt->fscache_uniq);
1251 mnt->fscache_uniq = NULL;
1252 break;
1253 case Opt_nofscache:
1254 mnt->options &= ~NFS_OPTION_FSCACHE;
1255 kfree(mnt->fscache_uniq);
1256 mnt->fscache_uniq = NULL;
1257 break;
Chuck Lever89652612012-09-14 17:24:11 -04001258 case Opt_migration:
1259 mnt->options |= NFS_OPTION_MIGRATION;
1260 break;
1261 case Opt_nomigration:
1262 mnt->options &= NFS_OPTION_MIGRATION;
1263 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001264
Chuck Leverf45663c2008-06-24 19:28:02 -04001265 /*
1266 * options that take numeric values
1267 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001268 case Opt_port:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001269 if (nfs_get_option_ul(args, &option) ||
1270 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001271 goto out_invalid_value;
1272 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001273 break;
1274 case Opt_rsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001275 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001276 goto out_invalid_value;
1277 mnt->rsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001278 break;
1279 case Opt_wsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001280 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001281 goto out_invalid_value;
1282 mnt->wsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001283 break;
1284 case Opt_bsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001285 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001286 goto out_invalid_value;
1287 mnt->bsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001288 break;
1289 case Opt_timeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001290 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001291 goto out_invalid_value;
1292 mnt->timeo = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001293 break;
1294 case Opt_retrans:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001295 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001296 goto out_invalid_value;
1297 mnt->retrans = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001298 break;
1299 case Opt_acregmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001300 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001301 goto out_invalid_value;
1302 mnt->acregmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001303 break;
1304 case Opt_acregmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001305 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001306 goto out_invalid_value;
1307 mnt->acregmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001308 break;
1309 case Opt_acdirmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001310 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001311 goto out_invalid_value;
1312 mnt->acdirmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001313 break;
1314 case Opt_acdirmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001315 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001316 goto out_invalid_value;
1317 mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001318 break;
1319 case Opt_actimeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001320 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001321 goto out_invalid_value;
1322 mnt->acregmin = mnt->acregmax =
1323 mnt->acdirmin = mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001324 break;
1325 case Opt_namelen:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001326 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001327 goto out_invalid_value;
1328 mnt->namlen = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001329 break;
1330 case Opt_mountport:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001331 if (nfs_get_option_ul(args, &option) ||
1332 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001333 goto out_invalid_value;
1334 mnt->mount_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001335 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001336 case Opt_mountvers:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001337 if (nfs_get_option_ul(args, &option) ||
Chuck Leverf45663c2008-06-24 19:28:02 -04001338 option < NFS_MNT_VERSION ||
Chuck Leverd23c45f2009-06-17 18:02:13 -07001339 option > NFS_MNT3_VERSION)
1340 goto out_invalid_value;
1341 mnt->mount_server.version = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001342 break;
Mike Sager3fd5be92009-04-01 09:21:48 -04001343 case Opt_minorversion:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001344 if (nfs_get_option_ul(args, &option))
Chuck Leverf3f4f4e2009-08-09 15:09:29 -04001345 goto out_invalid_value;
1346 if (option > NFS4_MAX_MINOR_VERSION)
1347 goto out_invalid_value;
1348 mnt->minorversion = option;
Mike Sager3fd5be92009-04-01 09:21:48 -04001349 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001350
Chuck Leverf45663c2008-06-24 19:28:02 -04001351 /*
1352 * options that take text values
1353 */
Trond Myklebust0d71b052012-03-02 13:59:49 -05001354 case Opt_nfsvers:
1355 string = match_strdup(args);
1356 if (string == NULL)
1357 goto out_nomem;
1358 rc = nfs_parse_version_string(string, mnt, args);
1359 kfree(string);
1360 if (!rc)
1361 goto out_invalid_value;
1362 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001363 case Opt_sec:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
Chuck Lever01060c82008-06-24 16:33:38 -04001367 rc = nfs_parse_security_flavors(string, mnt);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001368 kfree(string);
Chuck Leverf45663c2008-06-24 19:28:02 -04001369 if (!rc) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001370 dfprintk(MOUNT, "NFS: unrecognized "
1371 "security flavor\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001372 return 0;
Chuck Leverf45663c2008-06-24 19:28:02 -04001373 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001374 break;
1375 case Opt_proto:
1376 string = match_strdup(args);
1377 if (string == NULL)
1378 goto out_nomem;
1379 token = match_token(string,
1380 nfs_xprt_protocol_tokens, args);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001381
Jeff Laytonee671b02009-12-03 15:58:56 -05001382 protofamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001383 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001384 case Opt_xprt_udp6:
1385 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001386 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001387 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001388 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001389 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001390 case Opt_xprt_tcp6:
1391 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001392 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001393 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001394 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001395 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001396 case Opt_xprt_rdma:
1397 /* vector side protocols to TCP */
1398 mnt->flags |= NFS_MOUNT_TCP;
1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001400 xprt_load_transport(string);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001401 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001402 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001403 dfprintk(MOUNT, "NFS: unrecognized "
1404 "transport protocol\n");
Yinghai Lu4223a4a2009-10-20 14:13:46 +09001405 kfree(string);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001406 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001407 }
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001408 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001409 break;
1410 case Opt_mountproto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
Trond Myklebustd508afb2009-04-06 16:41:35 -07001416 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001417
Jeff Laytonee671b02009-12-03 15:58:56 -05001418 mountfamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001419 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001420 case Opt_xprt_udp6:
1421 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001422 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001423 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001424 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001425 case Opt_xprt_tcp6:
1426 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001427 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001428 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001429 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001430 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001431 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001432 dfprintk(MOUNT, "NFS: unrecognized "
1433 "transport protocol\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001434 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001435 }
1436 break;
1437 case Opt_addr:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001441 mnt->nfs_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001442 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001443 (struct sockaddr *)
1444 &mnt->nfs_server.address,
1445 sizeof(mnt->nfs_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001446 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001447 if (mnt->nfs_server.addrlen == 0)
1448 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001449 break;
1450 case Opt_clientaddr:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001451 if (nfs_get_option_str(args, &mnt->client_address))
Chuck Leverbf0fd762007-07-01 12:13:44 -04001452 goto out_nomem;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001453 break;
Chuck Lever33832032007-12-10 14:59:13 -05001454 case Opt_mounthost:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001455 if (nfs_get_option_str(args,
1456 &mnt->mount_server.hostname))
Chuck Lever33832032007-12-10 14:59:13 -05001457 goto out_nomem;
Chuck Lever33832032007-12-10 14:59:13 -05001458 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001459 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001460 string = match_strdup(args);
1461 if (string == NULL)
1462 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001463 mnt->mount_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001464 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001465 (struct sockaddr *)
1466 &mnt->mount_server.address,
1467 sizeof(mnt->mount_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001468 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001469 if (mnt->mount_server.addrlen == 0)
1470 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001471 break;
Trond Myklebust7973c1f12008-07-15 17:58:14 -04001472 case Opt_lookupcache:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 token = match_token(string,
1477 nfs_lookupcache_tokens, args);
1478 kfree(string);
1479 switch (token) {
1480 case Opt_lookupcache_all:
1481 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1482 break;
1483 case Opt_lookupcache_positive:
1484 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1486 break;
1487 case Opt_lookupcache_none:
1488 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1489 break;
1490 default:
Trond Myklebust7973c1f12008-07-15 17:58:14 -04001491 dfprintk(MOUNT, "NFS: invalid "
1492 "lookupcache argument\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001493 return 0;
Trond Myklebust7973c1f12008-07-15 17:58:14 -04001494 };
1495 break;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001496 case Opt_fscache_uniq:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001497 if (nfs_get_option_str(args, &mnt->fscache_uniq))
Chuck Levera6d5ff62010-05-07 13:33:58 -04001498 goto out_nomem;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001499 mnt->options |= NFS_OPTION_FSCACHE;
1500 break;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001501 case Opt_local_lock:
1502 string = match_strdup(args);
1503 if (string == NULL)
1504 goto out_nomem;
1505 token = match_token(string, nfs_local_lock_tokens,
1506 args);
1507 kfree(string);
1508 switch (token) {
1509 case Opt_local_lock_all:
1510 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1511 NFS_MOUNT_LOCAL_FCNTL);
1512 break;
1513 case Opt_local_lock_flock:
1514 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1515 break;
1516 case Opt_local_lock_posix:
1517 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1518 break;
1519 case Opt_local_lock_none:
1520 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1521 NFS_MOUNT_LOCAL_FCNTL);
1522 break;
1523 default:
1524 dfprintk(MOUNT, "NFS: invalid "
1525 "local_lock argument\n");
1526 return 0;
1527 };
1528 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001529
Chuck Leverf45663c2008-06-24 19:28:02 -04001530 /*
1531 * Special options
1532 */
1533 case Opt_sloppy:
1534 sloppy = 1;
1535 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1536 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001537 case Opt_userspace:
1538 case Opt_deprecated:
Chuck Leverd33e4df2008-06-12 12:37:41 -04001539 dfprintk(MOUNT, "NFS: ignoring mount option "
1540 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001541 break;
1542
1543 default:
Chuck Leverd23c45f2009-06-17 18:02:13 -07001544 invalid_option = 1;
Chuck Leverf45663c2008-06-24 19:28:02 -04001545 dfprintk(MOUNT, "NFS: unrecognized mount option "
1546 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001547 }
1548 }
1549
Chuck Leverd23c45f2009-06-17 18:02:13 -07001550 if (!sloppy && invalid_option)
1551 return 0;
1552
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001553 if (mnt->minorversion && mnt->version != 4)
1554 goto out_minorversion_mismatch;
1555
Chuck Lever89652612012-09-14 17:24:11 -04001556 if (mnt->options & NFS_OPTION_MIGRATION &&
1557 mnt->version != 4 && mnt->minorversion != 0)
1558 goto out_migration_misuse;
1559
Jeff Laytonee671b02009-12-03 15:58:56 -05001560 /*
1561 * verify that any proto=/mountproto= options match the address
Peter Meerwald1856b222012-08-18 17:38:54 +02001562 * families in the addr=/mountaddr= options.
Jeff Laytonee671b02009-12-03 15:58:56 -05001563 */
1564 if (protofamily != AF_UNSPEC &&
1565 protofamily != mnt->nfs_server.address.ss_family)
1566 goto out_proto_mismatch;
1567
1568 if (mountfamily != AF_UNSPEC) {
1569 if (mnt->mount_server.addrlen) {
1570 if (mountfamily != mnt->mount_server.address.ss_family)
1571 goto out_mountproto_mismatch;
1572 } else {
1573 if (mountfamily != mnt->nfs_server.address.ss_family)
1574 goto out_mountproto_mismatch;
1575 }
1576 }
1577
Chuck Leverbf0fd762007-07-01 12:13:44 -04001578 return 1;
1579
Jeff Laytonee671b02009-12-03 15:58:56 -05001580out_mountproto_mismatch:
1581 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1582 "option\n");
1583 return 0;
1584out_proto_mismatch:
1585 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1586 return 0;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001587out_invalid_address:
1588 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1589 return 0;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001590out_invalid_value:
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001591 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001592 return 0;
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001593out_minorversion_mismatch:
1594 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1595 "minorversion=%u\n", mnt->version, mnt->minorversion);
1596 return 0;
Chuck Lever89652612012-09-14 17:24:11 -04001597out_migration_misuse:
1598 printk(KERN_INFO
1599 "NFS: 'migration' not supported for this NFS version\n");
1600 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001601out_nomem:
1602 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1603 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001604out_security_failure:
1605 free_secdata(secdata);
1606 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1607 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001608}
1609
1610/*
Chuck Leverec88f282009-08-09 15:09:32 -04001611 * Match the requested auth flavors with the list returned by
1612 * the server. Returns zero and sets the mount's authentication
1613 * flavor on success; returns -EACCES if server does not support
1614 * the requested flavor.
1615 */
1616static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1617 struct nfs_mount_request *request)
1618{
1619 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1620
1621 /*
Chuck Lever5eecfde2009-08-21 17:50:30 -04001622 * Certain releases of Linux's mountd return an empty
1623 * flavor list. To prevent behavioral regression with
1624 * these servers (ie. rejecting mounts that used to
1625 * succeed), revert to pre-2.6.32 behavior (no checking)
1626 * if the returned flavor list is empty.
1627 */
1628 if (server_authlist_len == 0)
1629 return 0;
1630
1631 /*
Chuck Leverec88f282009-08-09 15:09:32 -04001632 * We avoid sophisticated negotiating here, as there are
1633 * plenty of cases where we can get it wrong, providing
1634 * either too little or too much security.
1635 *
1636 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1637 * flavor listed first. However, some servers list
1638 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1639 * preferred default, in args->auth_flavors[0] if user
1640 * didn't specify sec= mount option.
1641 */
1642 for (i = 0; i < args->auth_flavor_len; i++)
1643 for (j = 0; j < server_authlist_len; j++)
1644 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1645 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1646 request->auth_flavs[j]);
1647 args->auth_flavors[0] = request->auth_flavs[j];
1648 return 0;
1649 }
1650
1651 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1652 nfs_umount(request);
1653 return -EACCES;
1654}
1655
1656/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001657 * Use the remote server's MOUNT service to request the NFS file handle
1658 * corresponding to the provided path.
1659 */
Bryan Schumaker486aa692012-05-10 15:07:39 -04001660static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1661 struct nfs_fh *root_fh)
Chuck Lever0076d7b2007-07-01 12:13:49 -04001662{
Chuck Leverec88f282009-08-09 15:09:32 -04001663 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1664 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
Chuck Leverc5d120f2008-12-23 15:21:35 -05001665 struct nfs_mount_request request = {
1666 .sap = (struct sockaddr *)
1667 &args->mount_server.address,
1668 .dirpath = args->nfs_server.export_path,
1669 .protocol = args->mount_server.protocol,
1670 .fh = root_fh,
Chuck Lever50a737f2008-12-23 15:21:37 -05001671 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
Chuck Leverec88f282009-08-09 15:09:32 -04001672 .auth_flav_len = &server_authlist_len,
1673 .auth_flavs = server_authlist,
Stanislav Kinsbursky6d59b8d2012-01-10 16:12:54 +04001674 .net = args->net,
Chuck Leverc5d120f2008-12-23 15:21:35 -05001675 };
Chuck Lever4c568012007-12-10 14:59:28 -05001676 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001677
1678 if (args->mount_server.version == 0) {
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001679 switch (args->version) {
1680 default:
1681 args->mount_server.version = NFS_MNT3_VERSION;
1682 break;
1683 case 2:
1684 args->mount_server.version = NFS_MNT_VERSION;
1685 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001686 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001687 request.version = args->mount_server.version;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001688
Chuck Lever33832032007-12-10 14:59:13 -05001689 if (args->mount_server.hostname)
Chuck Leverc5d120f2008-12-23 15:21:35 -05001690 request.hostname = args->mount_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001691 else
Chuck Leverc5d120f2008-12-23 15:21:35 -05001692 request.hostname = args->nfs_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001693
Chuck Lever0076d7b2007-07-01 12:13:49 -04001694 /*
1695 * Construct the mount server's address.
1696 */
Chuck Lever4c568012007-12-10 14:59:28 -05001697 if (args->mount_server.address.ss_family == AF_UNSPEC) {
Chuck Leverc5d120f2008-12-23 15:21:35 -05001698 memcpy(request.sap, &args->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -05001699 args->nfs_server.addrlen);
1700 args->mount_server.addrlen = args->nfs_server.addrlen;
1701 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001702 request.salen = args->mount_server.addrlen;
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001703 nfs_set_port(request.sap, &args->mount_server.port, 0);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001704
1705 /*
1706 * Now ask the mount server to map our export path
1707 * to a file handle.
1708 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001709 status = nfs_mount(&request);
Chuck Leverec88f282009-08-09 15:09:32 -04001710 if (status != 0) {
1711 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1712 request.hostname, status);
1713 return status;
1714 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001715
Chuck Leverec88f282009-08-09 15:09:32 -04001716 /*
1717 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1718 */
1719 if (args->mount_server.version != NFS_MNT3_VERSION)
1720 return 0;
1721 return nfs_walk_authlist(args, &request);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001722}
1723
Bryan Schumakerff9099f22012-07-30 16:05:18 -04001724struct dentry *nfs_try_mount(int flags, const char *dev_name,
1725 struct nfs_mount_info *mount_info,
1726 struct nfs_subversion *nfs_mod)
Bryan Schumaker486aa692012-05-10 15:07:39 -04001727{
1728 int status;
1729 struct nfs_server *server;
1730
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001731 if (mount_info->parsed->need_mount) {
Bryan Schumaker87c70832012-05-10 15:07:43 -04001732 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001733 if (status)
1734 return ERR_PTR(status);
1735 }
Bryan Schumaker486aa692012-05-10 15:07:39 -04001736
1737 /* Get a volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001738 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001739 if (IS_ERR(server))
1740 return ERR_CAST(server);
1741
Bryan Schumakerab7017a2012-07-30 16:05:16 -04001742 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001743}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001744EXPORT_SYMBOL_GPL(nfs_try_mount);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001745
Rob Landleyc12bace2011-03-09 15:54:13 -06001746/*
1747 * Split "dev_name" into "hostname:export_path".
1748 *
1749 * The leftmost colon demarks the split between the server's hostname
1750 * and the export path. If the hostname starts with a left square
1751 * bracket, then it may contain colons.
1752 *
1753 * Note: caller frees hostname and export path, even on error.
1754 */
1755static int nfs_parse_devname(const char *dev_name,
1756 char **hostname, size_t maxnamlen,
1757 char **export_path, size_t maxpathlen)
Chuck Leverdc045892008-06-23 12:36:37 -04001758{
1759 size_t len;
Rob Landleyc12bace2011-03-09 15:54:13 -06001760 char *end;
Chuck Leverdc045892008-06-23 12:36:37 -04001761
Rob Landleyc12bace2011-03-09 15:54:13 -06001762 /* Is the host name protected with square brakcets? */
1763 if (*dev_name == '[') {
1764 end = strchr(++dev_name, ']');
1765 if (end == NULL || end[1] != ':')
1766 goto out_bad_devname;
Chuck Leverdc045892008-06-23 12:36:37 -04001767
Rob Landleyc12bace2011-03-09 15:54:13 -06001768 len = end - dev_name;
1769 end++;
1770 } else {
1771 char *comma;
1772
1773 end = strchr(dev_name, ':');
1774 if (end == NULL)
1775 goto out_bad_devname;
1776 len = end - dev_name;
1777
1778 /* kill possible hostname list: not supported */
1779 comma = strchr(dev_name, ',');
1780 if (comma != NULL && comma < end)
1781 *comma = 0;
1782 }
1783
Chuck Leverdc045892008-06-23 12:36:37 -04001784 if (len > maxnamlen)
1785 goto out_hostname;
1786
1787 /* N.B. caller will free nfs_server.hostname in all cases */
1788 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
Rob Landleyc12bace2011-03-09 15:54:13 -06001789 if (*hostname == NULL)
Chuck Leverdc045892008-06-23 12:36:37 -04001790 goto out_nomem;
Rob Landleyc12bace2011-03-09 15:54:13 -06001791 len = strlen(++end);
Chuck Leverdc045892008-06-23 12:36:37 -04001792 if (len > maxpathlen)
1793 goto out_path;
Rob Landleyc12bace2011-03-09 15:54:13 -06001794 *export_path = kstrndup(end, len, GFP_KERNEL);
Chuck Leverdc045892008-06-23 12:36:37 -04001795 if (!*export_path)
1796 goto out_nomem;
1797
1798 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1799 return 0;
1800
1801out_bad_devname:
1802 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1803 return -EINVAL;
1804
1805out_nomem:
1806 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1807 return -ENOMEM;
1808
1809out_hostname:
1810 dfprintk(MOUNT, "NFS: server hostname too long\n");
1811 return -ENAMETOOLONG;
1812
1813out_path:
1814 dfprintk(MOUNT, "NFS: export pathname too long\n");
1815 return -ENAMETOOLONG;
1816}
1817
1818/*
David Howells54ceac42006-08-22 20:06:13 -04001819 * Validate the NFS2/NFS3 mount data
1820 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001821 *
1822 * For option strings, user space handles the following behaviors:
1823 *
1824 * + DNS: mapping server host name to IP address ("addr=" option)
1825 *
1826 * + failure mode: how to behave if a mount request can't be handled
1827 * immediately ("fg/bg" option)
1828 *
1829 * + retry: how often to retry a mount request ("retry=" option)
1830 *
1831 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1832 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001833 */
Bryan Schumakerd72c7272012-05-10 15:07:41 -04001834static int nfs23_validate_mount_data(void *options,
1835 struct nfs_parsed_mount_data *args,
1836 struct nfs_fh *mntfh,
1837 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001838{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001839 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001840 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
Chuck Lever136d5582007-07-01 12:13:54 -04001841
Chuck Lever5df36e72007-07-01 12:12:56 -04001842 if (data == NULL)
1843 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001844
Bryan Schumakerc5afc8d2012-06-08 11:32:56 -04001845 args->version = NFS_DEFAULT_VERSION;
David Howellsf7b422b2006-06-09 09:34:33 -04001846 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001847 case 1:
1848 data->namlen = 0;
1849 case 2:
1850 data->bsize = 0;
1851 case 3:
1852 if (data->flags & NFS_MOUNT_VER3)
1853 goto out_no_v3;
1854 data->root.size = NFS2_FHSIZE;
1855 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1856 case 4:
1857 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1858 goto out_no_sec;
1859 case 5:
1860 memset(data->context, 0, sizeof(data->context));
1861 case 6:
Trond Myklebustb7e24452008-06-19 15:21:11 -04001862 if (data->flags & NFS_MOUNT_VER3) {
1863 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1864 goto out_invalid_fh;
Chuck Lever5df36e72007-07-01 12:12:56 -04001865 mntfh->size = data->root.size;
Chuck Lever764302c2009-09-08 19:50:03 -04001866 args->version = 3;
1867 } else {
Chuck Lever5df36e72007-07-01 12:12:56 -04001868 mntfh->size = NFS2_FHSIZE;
Chuck Lever764302c2009-09-08 19:50:03 -04001869 args->version = 2;
1870 }
Chuck Lever5df36e72007-07-01 12:12:56 -04001871
Chuck Lever5df36e72007-07-01 12:12:56 -04001872
1873 memcpy(mntfh->data, data->root.data, mntfh->size);
1874 if (mntfh->size < sizeof(mntfh->data))
1875 memset(mntfh->data + mntfh->size, 0,
1876 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001877
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001878 /*
1879 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1880 * can deal with.
1881 */
Trond Myklebustff3525a2008-08-15 16:59:14 -04001882 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -04001883 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001884 args->rsize = data->rsize;
1885 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001886 args->timeo = data->timeo;
1887 args->retrans = data->retrans;
1888 args->acregmin = data->acregmin;
1889 args->acregmax = data->acregmax;
1890 args->acdirmin = data->acdirmin;
1891 args->acdirmax = data->acdirmax;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001892 args->need_mount = false;
Chuck Lever4c568012007-12-10 14:59:28 -05001893
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001894 memcpy(sap, &data->addr, sizeof(data->addr));
Chuck Lever4c568012007-12-10 14:59:28 -05001895 args->nfs_server.addrlen = sizeof(data->addr);
Trond Myklebust872ece82012-09-04 11:05:07 -04001896 args->nfs_server.port = ntohs(data->addr.sin_port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001897 if (!nfs_verify_server_address(sap))
Chuck Lever4c568012007-12-10 14:59:28 -05001898 goto out_no_address;
1899
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001900 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001901 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001902 /* N.B. caller will free nfs_server.hostname in all cases */
1903 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1904 args->namlen = data->namlen;
1905 args->bsize = data->bsize;
Chuck Leverdd07c942008-06-24 16:33:46 -04001906
1907 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1908 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001909 if (!args->nfs_server.hostname)
1910 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001911
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001912 if (!(data->flags & NFS_MOUNT_NONLM))
1913 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1914 NFS_MOUNT_LOCAL_FCNTL);
1915 else
1916 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1917 NFS_MOUNT_LOCAL_FCNTL);
Eric Parisf9c3a382008-03-05 14:20:18 -05001918 /*
1919 * The legacy version 6 binary mount data from userspace has a
1920 * field used only to transport selinux information into the
1921 * the kernel. To continue to support that functionality we
1922 * have a touch of selinux knowledge here in the NFS code. The
1923 * userspace code converted context=blah to just blah so we are
1924 * converting back to the full string selinux understands.
1925 */
1926 if (data->context[0]){
1927#ifdef CONFIG_SECURITY_SELINUX
1928 int rc;
1929 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1930 if (!opts_str)
1931 return -ENOMEM;
1932 strcpy(opts_str, "context=");
1933 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1934 strcat(opts_str, &data->context[0]);
1935 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1936 kfree(opts_str);
1937 if (rc)
1938 return rc;
1939#else
1940 return -EINVAL;
1941#endif
1942 }
1943
Chuck Lever5df36e72007-07-01 12:12:56 -04001944 break;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001945 default:
1946 return NFS_TEXT_DATA;
David Howellsf7b422b2006-06-09 09:34:33 -04001947 }
David Howells54ceac42006-08-22 20:06:13 -04001948
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04001949#if !IS_ENABLED(CONFIG_NFS_V3)
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001950 if (args->version == 3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001951 goto out_v3_not_compiled;
1952#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001953
David Howells54ceac42006-08-22 20:06:13 -04001954 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04001955
1956out_no_data:
1957 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1958 return -EINVAL;
1959
1960out_no_v3:
1961 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1962 data->version);
1963 return -EINVAL;
1964
1965out_no_sec:
1966 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1967 return -EINVAL;
1968
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04001969#if !IS_ENABLED(CONFIG_NFS_V3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001970out_v3_not_compiled:
1971 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1972 return -EPROTONOSUPPORT;
1973#endif /* !CONFIG_NFS_V3 */
1974
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001975out_nomem:
1976 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1977 return -ENOMEM;
1978
Chuck Lever5df36e72007-07-01 12:12:56 -04001979out_no_address:
1980 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1981 return -EINVAL;
1982
1983out_invalid_fh:
1984 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1985 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04001986}
1987
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001988#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerd72c7272012-05-10 15:07:41 -04001989static int nfs_validate_mount_data(struct file_system_type *fs_type,
1990 void *options,
1991 struct nfs_parsed_mount_data *args,
1992 struct nfs_fh *mntfh,
1993 const char *dev_name)
1994{
1995 if (fs_type == &nfs_fs_type)
1996 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1997 return nfs4_validate_mount_data(options, args, dev_name);
1998}
1999#else
2000static int nfs_validate_mount_data(struct file_system_type *fs_type,
2001 void *options,
2002 struct nfs_parsed_mount_data *args,
2003 struct nfs_fh *mntfh,
2004 const char *dev_name)
2005{
2006 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2007}
2008#endif
2009
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002010static int nfs_validate_text_mount_data(void *options,
2011 struct nfs_parsed_mount_data *args,
2012 const char *dev_name)
2013{
2014 int port = 0;
2015 int max_namelen = PAGE_SIZE;
2016 int max_pathlen = NFS_MAXPATHLEN;
2017 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2018
2019 if (nfs_parse_mount_options((char *)options, args) == 0)
2020 return -EINVAL;
2021
2022 if (!nfs_verify_server_address(sap))
2023 goto out_no_address;
2024
2025 if (args->version == 4) {
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002026#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002027 port = NFS_PORT;
2028 max_namelen = NFS4_MAXNAMLEN;
2029 max_pathlen = NFS4_MAXPATHLEN;
2030 nfs_validate_transport_protocol(args);
2031 nfs4_validate_mount_flags(args);
2032#else
2033 goto out_v4_not_compiled;
2034#endif /* CONFIG_NFS_V4 */
2035 } else
2036 nfs_set_mount_transport_protocol(args);
2037
2038 nfs_set_port(sap, &args->nfs_server.port, port);
2039
2040 if (args->auth_flavor_len > 1)
2041 goto out_bad_auth;
2042
2043 return nfs_parse_devname(dev_name,
2044 &args->nfs_server.hostname,
2045 max_namelen,
2046 &args->nfs_server.export_path,
2047 max_pathlen);
2048
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002049#if !IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002050out_v4_not_compiled:
2051 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2052 return -EPROTONOSUPPORT;
2053#endif /* !CONFIG_NFS_V4 */
2054
2055out_no_address:
2056 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2057 return -EINVAL;
2058
2059out_bad_auth:
2060 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2061 return -EINVAL;
2062}
2063
Jeff Layton48b605f2008-06-10 15:38:39 -04002064static int
2065nfs_compare_remount_data(struct nfs_server *nfss,
2066 struct nfs_parsed_mount_data *data)
2067{
2068 if (data->flags != nfss->flags ||
2069 data->rsize != nfss->rsize ||
2070 data->wsize != nfss->wsize ||
2071 data->retrans != nfss->client->cl_timeout->to_retries ||
2072 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2073 data->acregmin != nfss->acregmin / HZ ||
2074 data->acregmax != nfss->acregmax / HZ ||
2075 data->acdirmin != nfss->acdirmin / HZ ||
2076 data->acdirmax != nfss->acdirmax / HZ ||
2077 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
Trond Myklebustbcd2ea12009-10-06 15:41:22 -04002078 data->nfs_server.port != nfss->port ||
Jeff Layton48b605f2008-06-10 15:38:39 -04002079 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
Stefan Richtera1be9ee2009-10-12 11:26:12 -04002080 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2081 (struct sockaddr *)&nfss->nfs_client->cl_addr))
Jeff Layton48b605f2008-06-10 15:38:39 -04002082 return -EINVAL;
2083
2084 return 0;
2085}
2086
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002087int
Jeff Layton48b605f2008-06-10 15:38:39 -04002088nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2089{
2090 int error;
2091 struct nfs_server *nfss = sb->s_fs_info;
2092 struct nfs_parsed_mount_data *data;
2093 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2094 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
Trond Myklebustcd100722008-06-17 16:12:00 -04002095 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
Jeff Layton48b605f2008-06-10 15:38:39 -04002096
2097 /*
2098 * Userspace mount programs that send binary options generally send
2099 * them populated with default values. We have no way to know which
2100 * ones were explicitly specified. Fall back to legacy behavior and
2101 * just return success.
2102 */
Marc Zyngier31c94462008-07-17 13:21:55 +02002103 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2104 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2105 options->version <= 6))))
Jeff Layton48b605f2008-06-10 15:38:39 -04002106 return 0;
2107
2108 data = kzalloc(sizeof(*data), GFP_KERNEL);
2109 if (data == NULL)
2110 return -ENOMEM;
2111
2112 /* fill out struct with values from existing mount */
2113 data->flags = nfss->flags;
2114 data->rsize = nfss->rsize;
2115 data->wsize = nfss->wsize;
2116 data->retrans = nfss->client->cl_timeout->to_retries;
2117 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2118 data->acregmin = nfss->acregmin / HZ;
2119 data->acregmax = nfss->acregmax / HZ;
2120 data->acdirmin = nfss->acdirmin / HZ;
2121 data->acdirmax = nfss->acdirmax / HZ;
2122 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
Trond Myklebustbcd2ea12009-10-06 15:41:22 -04002123 data->nfs_server.port = nfss->port;
Jeff Layton48b605f2008-06-10 15:38:39 -04002124 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2125 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2126 data->nfs_server.addrlen);
2127
2128 /* overwrite those values with any that were specified */
2129 error = nfs_parse_mount_options((char *)options, data);
2130 if (error < 0)
2131 goto out;
2132
Jeff Layton26c4c172011-04-27 11:49:09 -04002133 /*
2134 * noac is a special case. It implies -o sync, but that's not
2135 * necessarily reflected in the mtab options. do_remount_sb
2136 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2137 * remount options, so we have to explicitly reset it.
2138 */
2139 if (data->flags & NFS_MOUNT_NOAC)
2140 *flags |= MS_SYNCHRONOUS;
2141
Jeff Layton48b605f2008-06-10 15:38:39 -04002142 /* compare new mount options with old ones */
2143 error = nfs_compare_remount_data(nfss, data);
2144out:
2145 kfree(data);
2146 return error;
2147}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002148EXPORT_SYMBOL_GPL(nfs_remount);
Jeff Layton48b605f2008-06-10 15:38:39 -04002149
David Howells54ceac42006-08-22 20:06:13 -04002150/*
2151 * Initialise the common bits of the superblock
2152 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002153inline void nfs_initialise_sb(struct super_block *sb)
David Howells54ceac42006-08-22 20:06:13 -04002154{
2155 struct nfs_server *server = NFS_SB(sb);
2156
2157 sb->s_magic = NFS_SUPER_MAGIC;
2158
2159 /* We probably want something more informative here */
2160 snprintf(sb->s_id, sizeof(sb->s_id),
Vivek Trivedi5a7c9ee2012-03-15 23:58:52 +05302161 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
David Howells54ceac42006-08-22 20:06:13 -04002162
2163 if (sb->s_blocksize == 0)
2164 sb->s_blocksize = nfs_block_bits(server->wsize,
2165 &sb->s_blocksize_bits);
2166
Jens Axboe32a88aa2009-09-16 15:02:33 +02002167 sb->s_bdi = &server->backing_dev_info;
2168
David Howells54ceac42006-08-22 20:06:13 -04002169 nfs_super_set_maxbytes(sb, server->maxfilesize);
2170}
2171
2172/*
2173 * Finish setting up an NFS2/3 superblock
2174 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002175void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002176{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002177 struct nfs_parsed_mount_data *data = mount_info->parsed;
David Howells54ceac42006-08-22 20:06:13 -04002178 struct nfs_server *server = NFS_SB(sb);
2179
2180 sb->s_blocksize_bits = 0;
2181 sb->s_blocksize = 0;
Bryan Schumaker6a744902012-07-30 16:05:20 -04002182 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2183 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2184 if (data && data->bsize)
David Howells54ceac42006-08-22 20:06:13 -04002185 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2186
Bryan Schumaker6a744902012-07-30 16:05:20 -04002187 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002188 /* The VFS shouldn't apply the umask to mode bits. We will do
2189 * so ourselves when necessary.
2190 */
2191 sb->s_flags |= MS_POSIXACL;
2192 sb->s_time_gran = 1;
2193 }
2194
David Howells54ceac42006-08-22 20:06:13 -04002195 nfs_initialise_sb(sb);
2196}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002197EXPORT_SYMBOL_GPL(nfs_fill_super);
David Howells54ceac42006-08-22 20:06:13 -04002198
2199/*
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002200 * Finish setting up a cloned NFS2/3/4 superblock
David Howells54ceac42006-08-22 20:06:13 -04002201 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002202void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002203{
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002204 const struct super_block *old_sb = mount_info->cloned->sb;
David Howells54ceac42006-08-22 20:06:13 -04002205 struct nfs_server *server = NFS_SB(sb);
2206
2207 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2208 sb->s_blocksize = old_sb->s_blocksize;
2209 sb->s_maxbytes = old_sb->s_maxbytes;
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002210 sb->s_xattr = old_sb->s_xattr;
2211 sb->s_op = old_sb->s_op;
2212 sb->s_time_gran = 1;
David Howells54ceac42006-08-22 20:06:13 -04002213
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002214 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002215 /* The VFS shouldn't apply the umask to mode bits. We will do
2216 * so ourselves when necessary.
2217 */
2218 sb->s_flags |= MS_POSIXACL;
David Howells54ceac42006-08-22 20:06:13 -04002219 }
2220
David Howells54ceac42006-08-22 20:06:13 -04002221 nfs_initialise_sb(sb);
2222}
2223
Trond Myklebust275a5d22007-05-16 16:53:28 -04002224static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2225{
2226 const struct nfs_server *a = s->s_fs_info;
2227 const struct rpc_clnt *clnt_a = a->client;
2228 const struct rpc_clnt *clnt_b = b->client;
2229
2230 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2231 goto Ebusy;
2232 if (a->nfs_client != b->nfs_client)
2233 goto Ebusy;
2234 if (a->flags != b->flags)
2235 goto Ebusy;
2236 if (a->wsize != b->wsize)
2237 goto Ebusy;
2238 if (a->rsize != b->rsize)
2239 goto Ebusy;
2240 if (a->acregmin != b->acregmin)
2241 goto Ebusy;
2242 if (a->acregmax != b->acregmax)
2243 goto Ebusy;
2244 if (a->acdirmin != b->acdirmin)
2245 goto Ebusy;
2246 if (a->acdirmax != b->acdirmax)
2247 goto Ebusy;
2248 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2249 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002250 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04002251Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002252 return 0;
2253}
2254
2255struct nfs_sb_mountdata {
2256 struct nfs_server *server;
2257 int mntflags;
2258};
2259
2260static int nfs_set_super(struct super_block *s, void *data)
2261{
2262 struct nfs_sb_mountdata *sb_mntdata = data;
2263 struct nfs_server *server = sb_mntdata->server;
2264 int ret;
2265
2266 s->s_flags = sb_mntdata->mntflags;
2267 s->s_fs_info = server;
Al Viro8b244ff2010-12-18 11:29:39 -05002268 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002269 ret = set_anon_super(s, server);
2270 if (ret == 0)
2271 server->s_dev = s->s_dev;
2272 return ret;
2273}
2274
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002275static int nfs_compare_super_address(struct nfs_server *server1,
2276 struct nfs_server *server2)
2277{
2278 struct sockaddr *sap1, *sap2;
2279
2280 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2281 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2282
2283 if (sap1->sa_family != sap2->sa_family)
2284 return 0;
2285
2286 switch (sap1->sa_family) {
2287 case AF_INET: {
2288 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2289 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2290 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2291 return 0;
2292 if (sin1->sin_port != sin2->sin_port)
2293 return 0;
2294 break;
2295 }
2296 case AF_INET6: {
2297 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2298 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2299 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2300 return 0;
2301 if (sin1->sin6_port != sin2->sin6_port)
2302 return 0;
2303 break;
2304 }
2305 default:
2306 return 0;
2307 }
2308
2309 return 1;
2310}
2311
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002312static int nfs_compare_super(struct super_block *sb, void *data)
2313{
2314 struct nfs_sb_mountdata *sb_mntdata = data;
2315 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2316 int mntflags = sb_mntdata->mntflags;
2317
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002318 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002319 return 0;
2320 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2321 if (old->flags & NFS_MOUNT_UNSHARED)
2322 return 0;
2323 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2324 return 0;
2325 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04002326}
2327
Trond Myklebust39ffb922012-05-16 10:21:30 -07002328#ifdef CONFIG_NFS_FSCACHE
Bryan Schumaker2311b942012-05-10 15:07:32 -04002329static void nfs_get_cache_cookie(struct super_block *sb,
2330 struct nfs_parsed_mount_data *parsed,
2331 struct nfs_clone_mount *cloned)
2332{
Trond Myklebustc4271c62012-12-21 11:02:32 -05002333 struct nfs_server *nfss = NFS_SB(sb);
Bryan Schumaker2311b942012-05-10 15:07:32 -04002334 char *uniq = NULL;
2335 int ulen = 0;
2336
Trond Myklebustc4271c62012-12-21 11:02:32 -05002337 nfss->fscache_key = NULL;
2338 nfss->fscache = NULL;
2339
2340 if (parsed) {
2341 if (!(parsed->options & NFS_OPTION_FSCACHE))
2342 return;
2343 if (parsed->fscache_uniq) {
2344 uniq = parsed->fscache_uniq;
2345 ulen = strlen(parsed->fscache_uniq);
2346 }
Bryan Schumaker2311b942012-05-10 15:07:32 -04002347 } else if (cloned) {
2348 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
Trond Myklebustc4271c62012-12-21 11:02:32 -05002349 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2350 return;
Bryan Schumaker2311b942012-05-10 15:07:32 -04002351 if (mnt_s->fscache_key) {
2352 uniq = mnt_s->fscache_key->key.uniquifier;
2353 ulen = mnt_s->fscache_key->key.uniq_len;
2354 };
Trond Myklebustc4271c62012-12-21 11:02:32 -05002355 } else
2356 return;
Bryan Schumaker2311b942012-05-10 15:07:32 -04002357
2358 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2359}
Trond Myklebust39ffb922012-05-16 10:21:30 -07002360#else
2361static void nfs_get_cache_cookie(struct super_block *sb,
2362 struct nfs_parsed_mount_data *parsed,
2363 struct nfs_clone_mount *cloned)
2364{
2365}
2366#endif
Bryan Schumaker2311b942012-05-10 15:07:32 -04002367
Miklos Szeredifa799752008-04-30 00:54:33 -07002368static int nfs_bdi_register(struct nfs_server *server)
2369{
2370 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2371}
2372
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002373int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2374 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002375{
2376 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2377}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002378EXPORT_SYMBOL_GPL(nfs_set_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002379
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002380int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2381 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002382{
2383 /* clone any lsm security options from the parent to the new sb */
2384 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2385 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2386 return -ESTALE;
2387 return 0;
2388}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002389EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002390
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002391struct dentry *nfs_fs_mount_common(struct nfs_server *server,
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002392 int flags, const char *dev_name,
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002393 struct nfs_mount_info *mount_info,
2394 struct nfs_subversion *nfs_mod)
David Howells54ceac42006-08-22 20:06:13 -04002395{
David Howells54ceac42006-08-22 20:06:13 -04002396 struct super_block *s;
Al Viro01194982011-03-16 07:25:36 -04002397 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Trond Myklebust75180df2007-05-16 16:53:28 -04002398 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002399 struct nfs_sb_mountdata sb_mntdata = {
2400 .mntflags = flags,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002401 .server = server,
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002402 };
Al Viro01194982011-03-16 07:25:36 -04002403 int error;
David Howells54ceac42006-08-22 20:06:13 -04002404
Trond Myklebust75180df2007-05-16 16:53:28 -04002405 if (server->flags & NFS_MOUNT_UNSHARED)
2406 compare_super = NULL;
2407
Sachin Prabhufb2088c2011-08-01 12:10:12 +01002408 /* -o noac implies -o sync */
2409 if (server->flags & NFS_MOUNT_NOAC)
2410 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2411
David Howells54ceac42006-08-22 20:06:13 -04002412 /* Get a superblock - note that we may end up sharing one that already exists */
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002413 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002414 if (IS_ERR(s)) {
Al Viro01194982011-03-16 07:25:36 -04002415 mntroot = ERR_CAST(s);
David Howells54ceac42006-08-22 20:06:13 -04002416 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04002417 }
2418
David Howells54ceac42006-08-22 20:06:13 -04002419 if (s->s_fs_info != server) {
2420 nfs_free_server(server);
2421 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002422 } else {
2423 error = nfs_bdi_register(server);
Al Viro01194982011-03-16 07:25:36 -04002424 if (error) {
2425 mntroot = ERR_PTR(error);
NeilBrowncfbc0682010-03-11 11:20:17 +11002426 goto error_splat_bdi;
Al Viro01194982011-03-16 07:25:36 -04002427 }
David Howellsf7b422b2006-06-09 09:34:33 -04002428 }
David Howells54ceac42006-08-22 20:06:13 -04002429
2430 if (!s->s_root) {
2431 /* initial superblock/root creation */
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002432 mount_info->fill_super(s, mount_info);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002433 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
David Howells54ceac42006-08-22 20:06:13 -04002434 }
2435
Bryan Schumaker87c70832012-05-10 15:07:43 -04002436 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
Al Viro01194982011-03-16 07:25:36 -04002437 if (IS_ERR(mntroot))
David Howells54ceac42006-08-22 20:06:13 -04002438 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002439
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002440 error = mount_info->set_security(s, mntroot, mount_info);
Eric Parisf9c3a382008-03-05 14:20:18 -05002441 if (error)
2442 goto error_splat_root;
2443
David Howellsf7b422b2006-06-09 09:34:33 -04002444 s->s_flags |= MS_ACTIVE;
Chuck Lever06559602007-07-01 12:12:35 -04002445
2446out:
Al Viro01194982011-03-16 07:25:36 -04002447 return mntroot;
Trond Myklebust816724e2006-06-24 08:41:41 -04002448
David Howells54ceac42006-08-22 20:06:13 -04002449out_err_nosb:
2450 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04002451 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002452
Eric Parisf9c3a382008-03-05 14:20:18 -05002453error_splat_root:
2454 dput(mntroot);
Al Viro01194982011-03-16 07:25:36 -04002455 mntroot = ERR_PTR(error);
David Howells54ceac42006-08-22 20:06:13 -04002456error_splat_super:
NeilBrowncfbc0682010-03-11 11:20:17 +11002457 if (server && !s->s_root)
2458 bdi_unregister(&server->backing_dev_info);
2459error_splat_bdi:
Al Viro6f5bbff2009-05-06 01:34:22 -04002460 deactivate_locked_super(s);
Chuck Lever06559602007-07-01 12:12:35 -04002461 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002462}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002463EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
David Howellsf7b422b2006-06-09 09:34:33 -04002464
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002465struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002466 int flags, const char *dev_name, void *raw_data)
2467{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002468 struct nfs_mount_info mount_info = {
2469 .fill_super = nfs_fill_super,
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002470 .set_security = nfs_set_sb_security,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002471 };
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002472 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002473 struct nfs_subversion *nfs_mod;
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002474 int error;
2475
Bryan Schumaker46058d42012-05-10 15:07:42 -04002476 mount_info.parsed = nfs_alloc_parsed_mount_data();
Bryan Schumaker87c70832012-05-10 15:07:43 -04002477 mount_info.mntfh = nfs_alloc_fhandle();
2478 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002479 goto out;
2480
2481 /* Validate the mount data */
Bryan Schumaker87c70832012-05-10 15:07:43 -04002482 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002483 if (error == NFS_TEXT_DATA)
Bryan Schumaker46058d42012-05-10 15:07:42 -04002484 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002485 if (error < 0) {
2486 mntroot = ERR_PTR(error);
2487 goto out;
2488 }
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002489
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002490 nfs_mod = get_nfs_version(mount_info.parsed->version);
2491 if (IS_ERR(nfs_mod)) {
2492 mntroot = ERR_CAST(nfs_mod);
2493 goto out;
2494 }
2495
Bryan Schumakerff9099f22012-07-30 16:05:18 -04002496 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002497
2498 put_nfs_version(nfs_mod);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002499out:
Bryan Schumaker46058d42012-05-10 15:07:42 -04002500 nfs_free_parsed_mount_data(mount_info.parsed);
Bryan Schumaker87c70832012-05-10 15:07:43 -04002501 nfs_free_fhandle(mount_info.mntfh);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002502 return mntroot;
2503}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002504EXPORT_SYMBOL_GPL(nfs_fs_mount);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002505
David Howells54ceac42006-08-22 20:06:13 -04002506/*
Trond Myklebust387c1492010-02-03 08:27:35 -05002507 * Ensure that we unregister the bdi before kill_anon_super
2508 * releases the device name
2509 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002510void nfs_put_super(struct super_block *s)
Trond Myklebust387c1492010-02-03 08:27:35 -05002511{
2512 struct nfs_server *server = NFS_SB(s);
2513
2514 bdi_unregister(&server->backing_dev_info);
2515}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002516EXPORT_SYMBOL_GPL(nfs_put_super);
Trond Myklebust387c1492010-02-03 08:27:35 -05002517
2518/*
David Howells54ceac42006-08-22 20:06:13 -04002519 * Destroy an NFS2/3 superblock
2520 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002521void nfs_kill_super(struct super_block *s)
David Howellsf7b422b2006-06-09 09:34:33 -04002522{
2523 struct nfs_server *server = NFS_SB(s);
2524
2525 kill_anon_super(s);
David Howells08734042009-04-03 16:42:42 +01002526 nfs_fscache_release_super_cookie(s);
David Howells54ceac42006-08-22 20:06:13 -04002527 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002528}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002529EXPORT_SYMBOL_GPL(nfs_kill_super);
David Howellsf7b422b2006-06-09 09:34:33 -04002530
David Howells54ceac42006-08-22 20:06:13 -04002531/*
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002532 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
David Howells54ceac42006-08-22 20:06:13 -04002533 */
Stanislav Kinsbursky3dd4f8ef2012-10-02 14:19:04 +04002534static struct dentry *
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002535nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2536 const char *dev_name, void *raw_data)
David Howellsf7b422b2006-06-09 09:34:33 -04002537{
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002538 struct nfs_clone_mount *data = raw_data;
2539 struct nfs_mount_info mount_info = {
2540 .fill_super = nfs_clone_super,
2541 .set_security = nfs_clone_sb_security,
2542 .cloned = data,
2543 };
David Howells54ceac42006-08-22 20:06:13 -04002544 struct nfs_server *server;
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002545 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002546 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
David Howells54ceac42006-08-22 20:06:13 -04002547
Trond Myklebustdee972b2013-01-16 15:05:44 -05002548 dprintk("--> nfs_xdev_mount()\n");
David Howells54ceac42006-08-22 20:06:13 -04002549
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002550 mount_info.mntfh = mount_info.cloned->fh;
Bryan Schumaker87c70832012-05-10 15:07:43 -04002551
David Howells54ceac42006-08-22 20:06:13 -04002552 /* create a new volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04002553 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
David Howells54ceac42006-08-22 20:06:13 -04002554
Trond Myklebustdee972b2013-01-16 15:05:44 -05002555 if (IS_ERR(server))
2556 mntroot = ERR_CAST(server);
2557 else
2558 mntroot = nfs_fs_mount_common(server, flags,
2559 dev_name, &mount_info, nfs_mod);
2560
2561 dprintk("<-- nfs_xdev_mount() = %ld\n",
2562 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
Al Viro31f43472010-10-29 03:38:12 -04002563 return mntroot;
David Howellsf7b422b2006-06-09 09:34:33 -04002564}
2565
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002566#if IS_ENABLED(CONFIG_NFS_V4)
David Howells54ceac42006-08-22 20:06:13 -04002567
Trond Myklebust01c3f052009-06-17 13:22:58 -07002568static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2569{
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04002570 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2571 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
Trond Myklebust01c3f052009-06-17 13:22:58 -07002572}
2573
David Howells54ceac42006-08-22 20:06:13 -04002574/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04002575 * Validate NFSv4 mount options
2576 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002577static int nfs4_validate_mount_data(void *options,
2578 struct nfs_parsed_mount_data *args,
2579 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04002580{
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002581 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002582 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002583 char *c;
2584
2585 if (data == NULL)
2586 goto out_no_data;
2587
Bryan Schumakercdf66442012-06-05 14:59:54 -04002588 args->version = 4;
2589
Chuck Leverf0768eb2007-07-01 12:13:01 -04002590 switch (data->version) {
2591 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05002592 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002593 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05002594 if (data->host_addrlen == 0)
2595 goto out_no_address;
2596 args->nfs_server.addrlen = data->host_addrlen;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002597 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002598 return -EFAULT;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002599 if (!nfs_verify_server_address(sap))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002600 goto out_no_address;
Trond Myklebust872ece82012-09-04 11:05:07 -04002601 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002602
Chuck Lever6738b252008-06-24 16:33:54 -04002603 if (data->auth_flavourlen) {
2604 if (data->auth_flavourlen > 1)
2605 goto out_inval_auth;
Trond Myklebust20c71f52007-09-20 20:23:51 -04002606 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002607 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04002608 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002609 return -EFAULT;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002610 }
2611
2612 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2613 if (IS_ERR(c))
2614 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002615 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002616
2617 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2618 if (IS_ERR(c))
2619 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002620 args->nfs_server.export_path = c;
2621 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002622
2623 c = strndup_user(data->client_addr.data, 16);
2624 if (IS_ERR(c))
2625 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002626 args->client_address = c;
2627
2628 /*
2629 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2630 * can deal with.
2631 */
2632
2633 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2634 args->rsize = data->rsize;
2635 args->wsize = data->wsize;
2636 args->timeo = data->timeo;
2637 args->retrans = data->retrans;
2638 args->acregmin = data->acregmin;
2639 args->acregmax = data->acregmax;
2640 args->acdirmin = data->acdirmin;
2641 args->acdirmax = data->acdirmax;
2642 args->nfs_server.protocol = data->proto;
Trond Myklebust259875e2008-07-02 14:43:47 -04002643 nfs_validate_transport_protocol(args);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002644
2645 break;
Chuck Lever7630c852009-09-08 19:49:57 -04002646 default:
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002647 return NFS_TEXT_DATA;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002648 }
2649
2650 return 0;
2651
2652out_no_data:
2653 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2654 return -EINVAL;
2655
2656out_inval_auth:
2657 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2658 data->auth_flavourlen);
2659 return -EINVAL;
2660
2661out_no_address:
2662 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2663 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002664}
2665
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002666/*
2667 * NFS v4 module parameters need to stay in the
2668 * NFS client for backwards compatibility
2669 */
2670unsigned int nfs_callback_set_tcpport;
2671unsigned short nfs_callback_tcpport;
2672/* Default cache timeout is 10 minutes */
2673unsigned int nfs_idmap_cache_timeout = 600;
2674/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2675bool nfs4_disable_idmapping = true;
2676unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2677unsigned short send_implementation_id = 1;
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002678char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002679
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002680EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2681EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2682EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2683EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2684EXPORT_SYMBOL_GPL(max_session_slots);
2685EXPORT_SYMBOL_GPL(send_implementation_id);
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002686EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002687
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002688#define NFS_CALLBACK_MAXPORTNR (65535U)
2689
2690static int param_set_portnr(const char *val, const struct kernel_param *kp)
2691{
2692 unsigned long num;
2693 int ret;
2694
2695 if (!val)
2696 return -EINVAL;
Daniel Walter7297cb62012-09-26 21:51:46 +02002697 ret = kstrtoul(val, 0, &num);
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002698 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2699 return -EINVAL;
2700 *((unsigned int *)kp->arg) = num;
2701 return 0;
2702}
2703static struct kernel_param_ops param_ops_portnr = {
2704 .set = param_set_portnr,
2705 .get = param_get_uint,
2706};
2707#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2708
2709module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2710module_param(nfs_idmap_cache_timeout, int, 0644);
2711module_param(nfs4_disable_idmapping, bool, 0644);
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002712module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2713 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002714MODULE_PARM_DESC(nfs4_disable_idmapping,
2715 "Turn off NFSv4 idmapping when using 'sec=sys'");
2716module_param(max_session_slots, ushort, 0644);
2717MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2718 "requests the client will negotiate");
2719module_param(send_implementation_id, ushort, 0644);
2720MODULE_PARM_DESC(send_implementation_id,
2721 "Send implementation ID with NFSv4.1 exchange_id");
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002722MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
bjschuma@gmail.com425e7762012-08-08 13:57:10 -04002723
David Howells54ceac42006-08-22 20:06:13 -04002724#endif /* CONFIG_NFS_V4 */