blob: 2e7e8c878e5d157418e91a3ce742b8810168c5d3 [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>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040036#include <linux/sunrpc/xprtsock.h>
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040037#include <linux/sunrpc/xprtrdma.h>
David Howellsf7b422b2006-06-09 09:34:33 -040038#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
David Howellsf7b422b2006-06-09 09:34:33 -040042#include <linux/seq_file.h>
43#include <linux/mount.h>
Trond Myklebustc02d7ad2009-06-22 15:09:14 -040044#include <linux/namei.h>
David Howellsf7b422b2006-06-09 09:34:33 -040045#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050048#include <linux/in6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050050#include <net/ipv6.h>
Chuck Leverd8e77482008-06-23 12:37:01 -040051#include <linux/netdevice.h>
David Howellsf7b422b2006-06-09 09:34:33 -040052#include <linux/nfs_xdr.h>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080053#include <linux/magic.h>
Chuck Leverbf0fd762007-07-01 12:13:44 -040054#include <linux/parser.h>
Stanislav Kinsburskye50a7a12012-01-10 16:12:46 +040055#include <linux/nsproxy.h>
Trond Myklebust2446ab62012-03-01 17:00:56 -050056#include <linux/rcupdate.h>
Weston Andros Adamson324d0032012-10-30 17:01:39 -040057#include <linux/kthread.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 Myklebust7973c1f2008-07-15 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 Myklebust7973c1f2008-07-15 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 Myklebust7973c1f2008-07-15 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 Myklebust7973c1f2008-07-15 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,
Mark Fasheh349457c2006-09-08 14:22:21 -0700295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400296};
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400297EXPORT_SYMBOL_GPL(nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400298
David Howells54ceac42006-08-22 20:06:13 -0400299struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400300 .owner = THIS_MODULE,
301 .name = "nfs",
Al Viro31f43472010-10-29 03:38:12 -0400302 .mount = nfs_xdev_mount,
David Howellsf7b422b2006-06-09 09:34:33 -0400303 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400305};
306
Bryan Schumaker6a744902012-07-30 16:05:20 -0400307const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400308 .alloc_inode = nfs_alloc_inode,
309 .destroy_inode = nfs_destroy_inode,
310 .write_inode = nfs_write_inode,
Trond Myklebusteed99352012-12-14 14:36:36 -0500311 .drop_inode = nfs_drop_inode,
Trond Myklebust387c1492010-02-03 08:27:35 -0500312 .put_super = nfs_put_super,
David Howellsf7b422b2006-06-09 09:34:33 -0400313 .statfs = nfs_statfs,
Al Virob57922d2010-06-07 14:34:48 -0400314 .evict_inode = nfs_evict_inode,
David Howellsf7b422b2006-06-09 09:34:33 -0400315 .umount_begin = nfs_umount_begin,
316 .show_options = nfs_show_options,
Al Viroc7f404b2011-03-16 06:59:40 -0400317 .show_devname = nfs_show_devname,
318 .show_path = nfs_show_path,
David Howellsf7b422b2006-06-09 09:34:33 -0400319 .show_stats = nfs_show_stats,
Jeff Layton48b605f2008-06-10 15:38:39 -0400320 .remount_fs = nfs_remount,
David Howellsf7b422b2006-06-09 09:34:33 -0400321};
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400322EXPORT_SYMBOL_GPL(nfs_sops);
David Howellsf7b422b2006-06-09 09:34:33 -0400323
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400324#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400325static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
Bryan Schumakerd72c7272012-05-10 15:07:41 -0400326static int nfs4_validate_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400328
329struct file_system_type nfs4_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .mount = nfs_fs_mount,
333 .kill_sb = nfs_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
335};
336EXPORT_SYMBOL_GPL(nfs4_fs_type);
337
338static int __init register_nfs4_fs(void)
339{
340 return register_filesystem(&nfs4_fs_type);
341}
342
343static void unregister_nfs4_fs(void)
344{
345 unregister_filesystem(&nfs4_fs_type);
346}
347#else
348static int __init register_nfs4_fs(void)
349{
350 return 0;
351}
352
353static void unregister_nfs4_fs(void)
354{
355}
David Howellsf7b422b2006-06-09 09:34:33 -0400356#endif
357
Rusty Russell8e1f9362007-07-17 04:03:17 -0700358static struct shrinker acl_shrinker = {
359 .shrink = nfs_access_cache_shrinker,
360 .seeks = DEFAULT_SEEKS,
361};
Trond Myklebust979df722006-07-25 11:28:19 -0400362
David Howellsf7b422b2006-06-09 09:34:33 -0400363/*
364 * Register the NFS filesystems
365 */
366int __init register_nfs_fs(void)
367{
368 int ret;
369
370 ret = register_filesystem(&nfs_fs_type);
371 if (ret < 0)
372 goto error_0;
373
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400374 ret = register_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400375 if (ret < 0)
376 goto error_1;
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400377
378 ret = nfs_register_sysctl();
379 if (ret < 0)
380 goto error_2;
Rusty Russell8e1f9362007-07-17 04:03:17 -0700381 register_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400382 return 0;
383
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400384error_2:
385 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400386error_1:
387 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400388error_0:
389 return ret;
390}
391
392/*
393 * Unregister the NFS filesystems
394 */
395void __exit unregister_nfs_fs(void)
396{
Rusty Russell8e1f9362007-07-17 04:03:17 -0700397 unregister_shrinker(&acl_shrinker);
Alexey Dobriyan49af7ee2007-09-18 22:46:40 -0700398 nfs_unregister_sysctl();
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400399 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400400 unregister_filesystem(&nfs_fs_type);
401}
402
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400403void nfs_sb_active(struct super_block *sb)
Steve Dicksonef818a22007-11-08 04:05:04 -0500404{
405 struct nfs_server *server = NFS_SB(sb);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400406
407 if (atomic_inc_return(&server->active) == 1)
408 atomic_inc(&sb->s_active);
409}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400410EXPORT_SYMBOL_GPL(nfs_sb_active);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400411
412void nfs_sb_deactive(struct super_block *sb)
413{
414 struct nfs_server *server = NFS_SB(sb);
415
416 if (atomic_dec_and_test(&server->active))
417 deactivate_super(sb);
Steve Dicksonef818a22007-11-08 04:05:04 -0500418}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400419EXPORT_SYMBOL_GPL(nfs_sb_deactive);
Steve Dicksonef818a22007-11-08 04:05:04 -0500420
Weston Andros Adamson324d0032012-10-30 17:01:39 -0400421static int nfs_deactivate_super_async_work(void *ptr)
422{
423 struct super_block *sb = ptr;
424
425 deactivate_super(sb);
426 module_put_and_exit(0);
427 return 0;
428}
429
430/*
431 * same effect as deactivate_super, but will do final unmount in kthread
432 * context
433 */
434static void nfs_deactivate_super_async(struct super_block *sb)
435{
436 struct task_struct *task;
437 char buf[INET6_ADDRSTRLEN + 1];
438 struct nfs_server *server = NFS_SB(sb);
439 struct nfs_client *clp = server->nfs_client;
440
441 if (!atomic_add_unless(&sb->s_active, -1, 1)) {
442 rcu_read_lock();
443 snprintf(buf, sizeof(buf),
444 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
445 rcu_read_unlock();
446
447 __module_get(THIS_MODULE);
448 task = kthread_run(nfs_deactivate_super_async_work, sb,
449 "%s-deactivate-super", buf);
450 if (IS_ERR(task)) {
451 pr_err("%s: kthread_run: %ld\n",
452 __func__, PTR_ERR(task));
453 /* make synchronous call and hope for the best */
454 deactivate_super(sb);
455 module_put(THIS_MODULE);
456 }
457 }
458}
459
460void nfs_sb_deactive_async(struct super_block *sb)
461{
462 struct nfs_server *server = NFS_SB(sb);
463
464 if (atomic_dec_and_test(&server->active))
465 nfs_deactivate_super_async(sb);
466}
467EXPORT_SYMBOL_GPL(nfs_sb_deactive_async);
468
David Howellsf7b422b2006-06-09 09:34:33 -0400469/*
470 * Deliver file system statistics to userspace
471 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400472int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400473{
David Howells0c7d90c2006-08-22 20:06:10 -0400474 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400475 unsigned char blockbits;
476 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400477 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400478 struct nfs_fsstat res;
479 int error = -ENOMEM;
480
481 res.fattr = nfs_alloc_fattr();
482 if (res.fattr == NULL)
483 goto out_err;
David Howellsf7b422b2006-06-09 09:34:33 -0400484
David Howells8fa5c002006-08-22 20:06:12 -0400485 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400486 if (unlikely(error == -ESTALE)) {
487 struct dentry *pd_dentry;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400488
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400489 pd_dentry = dget_parent(dentry);
490 if (pd_dentry != NULL) {
491 nfs_zap_caches(pd_dentry->d_inode);
492 dput(pd_dentry);
493 }
494 }
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400495 nfs_free_fattr(res.fattr);
David Howellsf7b422b2006-06-09 09:34:33 -0400496 if (error < 0)
497 goto out_err;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400498
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700499 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400500
501 /*
502 * Current versions of glibc do not correctly handle the
503 * case where f_frsize != f_bsize. Eventually we want to
504 * report the value of wtmult in this field.
505 */
David Howells0c7d90c2006-08-22 20:06:10 -0400506 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400507
508 /*
509 * On most *nix systems, f_blocks, f_bfree, and f_bavail
510 * are reported in units of f_frsize. Linux hasn't had
511 * an f_frsize field in its statfs struct until recently,
512 * thus historically Linux's sys_statfs reports these
513 * fields in units of f_bsize.
514 */
David Howells0c7d90c2006-08-22 20:06:10 -0400515 buf->f_bsize = dentry->d_sb->s_blocksize;
516 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400517 blockres = (1 << blockbits) - 1;
518 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
519 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
520 buf->f_bavail = (res.abytes + blockres) >> blockbits;
521
522 buf->f_files = res.tfiles;
523 buf->f_ffree = res.afiles;
524
525 buf->f_namelen = server->namelen;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700526
David Howellsf7b422b2006-06-09 09:34:33 -0400527 return 0;
528
529 out_err:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700530 dprintk("%s: statfs error = %d\n", __func__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700531 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400532}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400533EXPORT_SYMBOL_GPL(nfs_statfs);
David Howellsf7b422b2006-06-09 09:34:33 -0400534
David Howells7d4e2742006-08-22 20:06:07 -0400535/*
536 * Map the security flavour number to a name
537 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400538static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
539{
David Howells7d4e2742006-08-22 20:06:07 -0400540 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400541 rpc_authflavor_t flavour;
542 const char *str;
543 } sec_flavours[] = {
544 { RPC_AUTH_NULL, "null" },
545 { RPC_AUTH_UNIX, "sys" },
546 { RPC_AUTH_GSS_KRB5, "krb5" },
547 { RPC_AUTH_GSS_KRB5I, "krb5i" },
548 { RPC_AUTH_GSS_KRB5P, "krb5p" },
549 { RPC_AUTH_GSS_LKEY, "lkey" },
550 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
551 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
552 { RPC_AUTH_GSS_SPKM, "spkm" },
553 { RPC_AUTH_GSS_SPKMI, "spkmi" },
554 { RPC_AUTH_GSS_SPKMP, "spkmp" },
Chuck Lever4d81cd12007-07-01 12:12:40 -0400555 { UINT_MAX, "unknown" }
Trond Myklebust81039f12006-06-09 09:34:34 -0400556 };
557 int i;
558
Chuck Lever4d81cd12007-07-01 12:12:40 -0400559 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
Trond Myklebust81039f12006-06-09 09:34:34 -0400560 if (sec_flavours[i].flavour == flavour)
561 break;
562 }
563 return sec_flavours[i].str;
564}
565
Jeff Laytonee671b02009-12-03 15:58:56 -0500566static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
567 int showdefaults)
568{
569 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
570
571 seq_printf(m, ",mountproto=");
572 switch (sap->sa_family) {
573 case AF_INET:
574 switch (nfss->mountd_protocol) {
575 case IPPROTO_UDP:
576 seq_printf(m, RPCBIND_NETID_UDP);
577 break;
578 case IPPROTO_TCP:
579 seq_printf(m, RPCBIND_NETID_TCP);
580 break;
581 default:
582 if (showdefaults)
583 seq_printf(m, "auto");
584 }
585 break;
586 case AF_INET6:
587 switch (nfss->mountd_protocol) {
588 case IPPROTO_UDP:
589 seq_printf(m, RPCBIND_NETID_UDP6);
590 break;
591 case IPPROTO_TCP:
592 seq_printf(m, RPCBIND_NETID_TCP6);
593 break;
594 default:
595 if (showdefaults)
596 seq_printf(m, "auto");
597 }
598 break;
599 default:
600 if (showdefaults)
601 seq_printf(m, "auto");
602 }
603}
604
Chuck Lever82d101d2008-03-14 14:10:37 -0400605static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607{
608 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
609
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -0400610 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
611 return;
612
Chuck Lever82d101d2008-03-14 14:10:37 -0400613 switch (sap->sa_family) {
614 case AF_INET: {
615 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
Harvey Harrisonbe859402008-10-31 00:56:28 -0700616 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400617 break;
618 }
619 case AF_INET6: {
620 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
Chuck Leverd250e192009-12-03 15:58:56 -0500621 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400622 break;
623 }
624 default:
625 if (showdefaults)
626 seq_printf(m, ",mountaddr=unspecified");
627 }
628
629 if (nfss->mountd_version || showdefaults)
630 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
Stanislav Kinsburskyaa699472010-12-08 12:40:13 +0300631 if ((nfss->mountd_port &&
632 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
633 showdefaults)
Chuck Lever82d101d2008-03-14 14:10:37 -0400634 seq_printf(m, ",mountport=%u", nfss->mountd_port);
635
Jeff Laytonee671b02009-12-03 15:58:56 -0500636 nfs_show_mountd_netid(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400637}
638
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400639#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust0be81892010-06-18 12:23:58 -0400640static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
641 int showdefaults)
642{
643 struct nfs_client *clp = nfss->nfs_client;
644
645 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
Trond Myklebust0be81892010-06-18 12:23:58 -0400646}
647#else
648static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
649 int showdefaults)
650{
651}
652#endif
653
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500654static void nfs_show_nfs_version(struct seq_file *m,
655 unsigned int version,
656 unsigned int minorversion)
657{
658 seq_printf(m, ",vers=%u", version);
659 if (version == 4)
660 seq_printf(m, ".%u", minorversion);
661}
662
David Howellsf7b422b2006-06-09 09:34:33 -0400663/*
664 * Describe the mount options in force on this server representation
665 */
Chuck Lever82d101d2008-03-14 14:10:37 -0400666static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
667 int showdefaults)
David Howellsf7b422b2006-06-09 09:34:33 -0400668{
David Howells509de812006-08-22 20:06:11 -0400669 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400670 int flag;
David Howells509de812006-08-22 20:06:11 -0400671 const char *str;
672 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400673 } nfs_info[] = {
674 { NFS_MOUNT_SOFT, ",soft", ",hard" },
Chuck Lever82d101d2008-03-14 14:10:37 -0400675 { NFS_MOUNT_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400676 { NFS_MOUNT_NOCTO, ",nocto", "" },
677 { NFS_MOUNT_NOAC, ",noac", "" },
678 { NFS_MOUNT_NONLM, ",nolock", "" },
679 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400680 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Chuck Leverd7403512008-12-23 15:21:37 -0500681 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
682 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400683 { 0, NULL, NULL }
684 };
David Howells509de812006-08-22 20:06:11 -0400685 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400686 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400687 u32 version = clp->rpc_ops->version;
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400688 int local_flock, local_fcntl;
David Howellsf7b422b2006-06-09 09:34:33 -0400689
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500690 nfs_show_nfs_version(m, version, clp->cl_minorversion);
Chuck Lever2d767432008-03-14 14:10:08 -0400691 seq_printf(m, ",rsize=%u", nfss->rsize);
692 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400693 if (nfss->bsize != 0)
694 seq_printf(m, ",bsize=%u", nfss->bsize);
695 seq_printf(m, ",namlen=%u", nfss->namelen);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400696 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400697 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400698 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400699 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400700 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400701 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400702 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400703 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400704 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
705 if (nfss->flags & nfs_infop->flag)
706 seq_puts(m, nfs_infop->str);
707 else
708 seq_puts(m, nfs_infop->nostr);
709 }
Trond Myklebust2446ab62012-03-01 17:00:56 -0500710 rcu_read_lock();
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400711 seq_printf(m, ",proto=%s",
Jeff Laytonee671b02009-12-03 15:58:56 -0500712 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500713 rcu_read_unlock();
Chuck Lever82d101d2008-03-14 14:10:37 -0400714 if (version == 4) {
715 if (nfss->port != NFS_PORT)
716 seq_printf(m, ",port=%u", nfss->port);
717 } else
718 if (nfss->port)
719 seq_printf(m, ",port=%u", nfss->port);
720
Trond Myklebust33170232007-12-20 16:03:59 -0500721 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
722 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400723 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400724
725 if (version != 4)
726 nfs_show_mountd_options(m, nfss, showdefaults);
Trond Myklebust0be81892010-06-18 12:23:58 -0400727 else
728 nfs_show_nfsv4_options(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400729
David Howellsb797cac2009-04-03 16:42:48 +0100730 if (nfss->options & NFS_OPTION_FSCACHE)
731 seq_printf(m, ",fsc");
Patrick J. LoPresti9b00c642010-08-10 17:28:01 -0400732
Chuck Lever89652612012-09-14 17:24:11 -0400733 if (nfss->options & NFS_OPTION_MIGRATION)
734 seq_printf(m, ",migration");
735
Patrick J. LoPresti9b00c642010-08-10 17:28:01 -0400736 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
738 seq_printf(m, ",lookupcache=none");
739 else
740 seq_printf(m, ",lookupcache=pos");
741 }
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400742
743 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
744 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
745
746 if (!local_flock && !local_fcntl)
747 seq_printf(m, ",local_lock=none");
748 else if (local_flock && local_fcntl)
749 seq_printf(m, ",local_lock=all");
750 else if (local_flock)
751 seq_printf(m, ",local_lock=flock");
752 else
753 seq_printf(m, ",local_lock=posix");
David Howellsf7b422b2006-06-09 09:34:33 -0400754}
755
756/*
757 * Describe the mount options on this VFS mountpoint
758 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400759int nfs_show_options(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400760{
Al Viro34c80b12011-12-08 21:32:45 -0500761 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400762
763 nfs_show_mount_options(m, nfss, 0);
764
Trond Myklebust2446ab62012-03-01 17:00:56 -0500765 rcu_read_lock();
Chuck Lever5d8515c2007-12-10 14:57:16 -0500766 seq_printf(m, ",addr=%s",
767 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
768 RPC_DISPLAY_ADDR));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500769 rcu_read_unlock();
David Howellsf7b422b2006-06-09 09:34:33 -0400770
771 return 0;
772}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400773EXPORT_SYMBOL_GPL(nfs_show_options);
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700774
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400775#if IS_ENABLED(CONFIG_NFS_V4)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300776#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700777static void show_sessions(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300778{
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781}
782#else
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700783static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784#endif
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300785#endif
786
787#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700788static void show_pnfs(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300789{
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795}
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500796
797static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798{
Chuck Lever59155542012-05-21 22:44:41 -0400799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700807#else
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400808#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500809static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810{
811}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700812#endif
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500813static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814{
815}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700816#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400817
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400818int nfs_show_devname(struct seq_file *m, struct dentry *root)
Al Viroc7f404b2011-03-16 06:59:40 -0400819{
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
Ben Hutchings97a54862012-10-21 19:23:52 +0100825 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
Al Viroc7f404b2011-03-16 06:59:40 -0400826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400833EXPORT_SYMBOL_GPL(nfs_show_devname);
Al Viroc7f404b2011-03-16 06:59:40 -0400834
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400835int nfs_show_path(struct seq_file *m, struct dentry *dentry)
Al Viroc7f404b2011-03-16 06:59:40 -0400836{
837 seq_puts(m, "/");
838 return 0;
839}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400840EXPORT_SYMBOL_GPL(nfs_show_path);
Al Viroc7f404b2011-03-16 06:59:40 -0400841
David Howellsf7b422b2006-06-09 09:34:33 -0400842/*
843 * Present statistical information for this VFS mountpoint
844 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400845int nfs_show_stats(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400846{
847 int i, cpu;
Al Viro64132372011-12-08 20:51:13 -0500848 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400849 struct rpc_auth *auth = nfss->client->cl_auth;
850 struct nfs_iostats totals = { };
851
852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853
854 /*
855 * Display all mount option settings
856 */
857 seq_printf(m, "\n\topts:\t");
Al Viro64132372011-12-08 20:51:13 -0500858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
David Howellsf7b422b2006-06-09 09:34:33 -0400862 nfs_show_mount_options(m, nfss, 1);
863
864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
865
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500866 show_implementation_id(m, nfss);
Weston Andros Adamson7d2ed9a2012-02-17 15:20:26 -0500867
David Howellsf7b422b2006-06-09 09:34:33 -0400868 seq_printf(m, "\n\tcaps:\t");
869 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400870 seq_printf(m, ",wtmult=%u", nfss->wtmult);
871 seq_printf(m, ",dtsize=%u", nfss->dtsize);
872 seq_printf(m, ",bsize=%u", nfss->bsize);
873 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400874
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400875#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust40c553192007-12-14 14:56:07 -0500876 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400877 seq_printf(m, "\n\tnfsv4:\t");
878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300881 show_sessions(m, nfss);
882 show_pnfs(m, nfss);
David Howellsf7b422b2006-06-09 09:34:33 -0400883 }
884#endif
885
886 /*
887 * Display security flavor in effect for this mount
888 */
Chuck Lever2d767432008-03-14 14:10:08 -0400889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400890 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400892
893 /*
894 * Display superblock I/O counters
895 */
896 for_each_possible_cpu(cpu) {
897 struct nfs_iostats *stats;
898
899 preempt_disable();
900 stats = per_cpu_ptr(nfss->io_stats, cpu);
901
902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
903 totals.events[i] += stats->events[i];
904 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
905 totals.bytes[i] += stats->bytes[i];
David Howells6a510912009-04-03 16:42:43 +0100906#ifdef CONFIG_NFS_FSCACHE
907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
908 totals.fscache[i] += stats->fscache[i];
909#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400910
911 preempt_enable();
912 }
913
914 seq_printf(m, "\n\tevents:\t");
915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
916 seq_printf(m, "%lu ", totals.events[i]);
917 seq_printf(m, "\n\tbytes:\t");
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
David Howells6a510912009-04-03 16:42:43 +0100920#ifdef CONFIG_NFS_FSCACHE
921 if (nfss->options & NFS_OPTION_FSCACHE) {
922 seq_printf(m, "\n\tfsc:\t");
923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
924 seq_printf(m, "%Lu ", totals.bytes[i]);
925 }
926#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400927 seq_printf(m, "\n");
928
929 rpc_print_iostats(m, nfss->client);
930
931 return 0;
932}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400933EXPORT_SYMBOL_GPL(nfs_show_stats);
David Howellsf7b422b2006-06-09 09:34:33 -0400934
935/*
936 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400937 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400938 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400939void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400940{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200941 struct nfs_server *server;
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400942 struct rpc_clnt *rpc;
943
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200944 server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400945 /* -EIO all pending I/O */
946 rpc = server->client_acl;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
949 rpc = server->client;
950 if (!IS_ERR(rpc))
951 rpc_killall_tasks(rpc);
David Howellsf7b422b2006-06-09 09:34:33 -0400952}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400953EXPORT_SYMBOL_GPL(nfs_umount_begin);
David Howellsf7b422b2006-06-09 09:34:33 -0400954
Bryan Schumakerdb833352012-05-10 15:07:38 -0400955static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
Chuck Lever9423a082009-09-23 14:36:38 -0400956{
957 struct nfs_parsed_mount_data *data;
958
959 data = kzalloc(sizeof(*data), GFP_KERNEL);
960 if (data) {
Chuck Lever9423a082009-09-23 14:36:38 -0400961 data->acregmin = NFS_DEF_ACREGMIN;
962 data->acregmax = NFS_DEF_ACREGMAX;
963 data->acdirmin = NFS_DEF_ACDIRMIN;
964 data->acdirmax = NFS_DEF_ACDIRMAX;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400965 data->mount_server.port = NFS_UNSPEC_PORT;
Chuck Lever9423a082009-09-23 14:36:38 -0400966 data->nfs_server.port = NFS_UNSPEC_PORT;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400967 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Lever9423a082009-09-23 14:36:38 -0400968 data->auth_flavors[0] = RPC_AUTH_UNIX;
969 data->auth_flavor_len = 1;
970 data->minorversion = 0;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400971 data->need_mount = true;
Trond Myklebust9937347a2012-02-19 08:44:07 +0100972 data->net = current->nsproxy->net_ns;
Jeff Layton8a0d5512011-12-20 06:57:45 -0500973 security_init_mnt_opts(&data->lsm_opts);
Chuck Lever9423a082009-09-23 14:36:38 -0400974 }
975 return data;
976}
977
Jeff Layton8a0d5512011-12-20 06:57:45 -0500978static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
979{
980 if (data) {
981 kfree(data->client_address);
982 kfree(data->mount_server.hostname);
983 kfree(data->nfs_server.export_path);
984 kfree(data->nfs_server.hostname);
985 kfree(data->fscache_uniq);
986 security_free_mnt_opts(&data->lsm_opts);
987 kfree(data);
988 }
989}
990
David Howellsf7b422b2006-06-09 09:34:33 -0400991/*
Chuck Levercdcd7f92007-12-10 14:57:45 -0500992 * Sanity-check a server address provided by the mount command.
993 *
994 * Address family must be initialized, and address must not be
995 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400996 */
997static int nfs_verify_server_address(struct sockaddr *addr)
998{
999 switch (addr->sa_family) {
1000 case AF_INET: {
Chuck Levercdcd7f92007-12-10 14:57:45 -05001001 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -07001002 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f92007-12-10 14:57:45 -05001003 }
1004 case AF_INET6: {
1005 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1006 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -04001007 }
1008 }
1009
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001010 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
Chuck Leverfc50d582007-07-01 12:12:46 -04001011 return 0;
1012}
1013
Chuck Lever9412b922007-12-10 14:59:21 -05001014/*
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001015 * Select between a default port value and a user-specified port value.
1016 * If a zero value is set, then autobind will be used.
1017 */
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001018static void nfs_set_port(struct sockaddr *sap, int *port,
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001019 const unsigned short default_port)
1020{
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001021 if (*port == NFS_UNSPEC_PORT)
1022 *port = default_port;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001023
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001024 rpc_set_port(sap, *port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001025}
1026
1027/*
Trond Myklebust259875e2008-07-02 14:43:47 -04001028 * Sanity check the NFS transport protocol.
1029 *
1030 */
1031static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1032{
1033 switch (mnt->nfs_server.protocol) {
1034 case XPRT_TRANSPORT_UDP:
1035 case XPRT_TRANSPORT_TCP:
1036 case XPRT_TRANSPORT_RDMA:
1037 break;
1038 default:
1039 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1040 }
1041}
1042
1043/*
1044 * For text based NFSv2/v3 mounts, the mount protocol transport default
1045 * settings should depend upon the specified NFS transport.
1046 */
1047static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1048{
1049 nfs_validate_transport_protocol(mnt);
1050
1051 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1052 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1053 return;
1054 switch (mnt->nfs_server.protocol) {
1055 case XPRT_TRANSPORT_UDP:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1057 break;
1058 case XPRT_TRANSPORT_TCP:
1059 case XPRT_TRANSPORT_RDMA:
1060 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1061 }
1062}
1063
1064/*
Chuck Lever01060c82008-06-24 16:33:38 -04001065 * Parse the value of the 'sec=' option.
Chuck Lever01060c82008-06-24 16:33:38 -04001066 */
1067static int nfs_parse_security_flavors(char *value,
1068 struct nfs_parsed_mount_data *mnt)
1069{
1070 substring_t args[MAX_OPT_ARGS];
1071
1072 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1073
1074 switch (match_token(value, nfs_secflavor_tokens, args)) {
1075 case Opt_sec_none:
Chuck Lever01060c82008-06-24 16:33:38 -04001076 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1077 break;
1078 case Opt_sec_sys:
Chuck Lever01060c82008-06-24 16:33:38 -04001079 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1080 break;
1081 case Opt_sec_krb5:
Chuck Lever01060c82008-06-24 16:33:38 -04001082 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1083 break;
1084 case Opt_sec_krb5i:
Chuck Lever01060c82008-06-24 16:33:38 -04001085 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1086 break;
1087 case Opt_sec_krb5p:
Chuck Lever01060c82008-06-24 16:33:38 -04001088 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1089 break;
1090 case Opt_sec_lkey:
Chuck Lever01060c82008-06-24 16:33:38 -04001091 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1092 break;
1093 case Opt_sec_lkeyi:
Chuck Lever01060c82008-06-24 16:33:38 -04001094 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1095 break;
1096 case Opt_sec_lkeyp:
Chuck Lever01060c82008-06-24 16:33:38 -04001097 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1098 break;
1099 case Opt_sec_spkm:
Chuck Lever01060c82008-06-24 16:33:38 -04001100 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1101 break;
1102 case Opt_sec_spkmi:
Chuck Lever01060c82008-06-24 16:33:38 -04001103 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1104 break;
1105 case Opt_sec_spkmp:
Chuck Lever01060c82008-06-24 16:33:38 -04001106 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1107 break;
1108 default:
1109 return 0;
1110 }
1111
Bryan Schumaker9b7160c2011-04-13 14:31:30 -04001112 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
Chuck Lever059f90b2009-08-09 15:09:31 -04001113 mnt->auth_flavor_len = 1;
Chuck Lever01060c82008-06-24 16:33:38 -04001114 return 1;
1115}
1116
Trond Myklebust0d71b052012-03-02 13:59:49 -05001117static int nfs_parse_version_string(char *string,
1118 struct nfs_parsed_mount_data *mnt,
1119 substring_t *args)
1120{
1121 mnt->flags &= ~NFS_MOUNT_VER3;
1122 switch (match_token(string, nfs_vers_tokens, args)) {
1123 case Opt_vers_2:
1124 mnt->version = 2;
1125 break;
1126 case Opt_vers_3:
1127 mnt->flags |= NFS_MOUNT_VER3;
1128 mnt->version = 3;
1129 break;
1130 case Opt_vers_4:
1131 /* Backward compatibility option. In future,
1132 * the mount program should always supply
1133 * a NFSv4 minor version number.
1134 */
1135 mnt->version = 4;
1136 break;
1137 case Opt_vers_4_0:
1138 mnt->version = 4;
1139 mnt->minorversion = 0;
1140 break;
1141 case Opt_vers_4_1:
1142 mnt->version = 4;
1143 mnt->minorversion = 1;
1144 break;
1145 default:
1146 return 0;
1147 }
1148 return 1;
1149}
1150
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001151static int nfs_get_option_str(substring_t args[], char **option)
1152{
1153 kfree(*option);
1154 *option = match_strdup(args);
Xi Wange25fbe32013-01-04 03:22:57 -05001155 return !*option;
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001156}
1157
1158static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1159{
1160 int rc;
1161 char *string;
1162
1163 string = match_strdup(args);
1164 if (string == NULL)
1165 return -ENOMEM;
Daniel Walter7297cb62012-09-26 21:51:46 +02001166 rc = kstrtoul(string, 10, option);
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001167 kfree(string);
1168
1169 return rc;
1170}
1171
Chuck Lever01060c82008-06-24 16:33:38 -04001172/*
Chuck Leverbf0fd762007-07-01 12:13:44 -04001173 * Error-check and convert a string of mount options from user space into
Chuck Leverf45663c2008-06-24 19:28:02 -04001174 * a data structure. The whole mount string is processed; bad options are
1175 * skipped as they are encountered. If there were no errors, return 1;
1176 * otherwise return 0 (zero).
Chuck Leverbf0fd762007-07-01 12:13:44 -04001177 */
1178static int nfs_parse_mount_options(char *raw,
1179 struct nfs_parsed_mount_data *mnt)
1180{
Eric Parisf9c3a382008-03-05 14:20:18 -05001181 char *p, *string, *secdata;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001182 int rc, sloppy = 0, invalid_option = 0;
Jeff Laytonee671b02009-12-03 15:58:56 -05001183 unsigned short protofamily = AF_UNSPEC;
1184 unsigned short mountfamily = AF_UNSPEC;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001185
1186 if (!raw) {
1187 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1188 return 1;
1189 }
1190 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1191
Eric Parisf9c3a382008-03-05 14:20:18 -05001192 secdata = alloc_secdata();
1193 if (!secdata)
1194 goto out_nomem;
1195
1196 rc = security_sb_copy_data(raw, secdata);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1201 if (rc)
1202 goto out_security_failure;
1203
1204 free_secdata(secdata);
1205
Chuck Leverbf0fd762007-07-01 12:13:44 -04001206 while ((p = strsep(&raw, ",")) != NULL) {
1207 substring_t args[MAX_OPT_ARGS];
Chuck Levera5a16ba2009-06-17 18:02:14 -07001208 unsigned long option;
1209 int token;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001210
1211 if (!*p)
1212 continue;
1213
1214 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1215
1216 token = match_token(p, nfs_mount_option_tokens, args);
1217 switch (token) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001218
1219 /*
1220 * boolean options: foo/nofoo
1221 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001222 case Opt_soft:
1223 mnt->flags |= NFS_MOUNT_SOFT;
1224 break;
1225 case Opt_hard:
1226 mnt->flags &= ~NFS_MOUNT_SOFT;
1227 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001228 case Opt_posix:
1229 mnt->flags |= NFS_MOUNT_POSIX;
1230 break;
1231 case Opt_noposix:
1232 mnt->flags &= ~NFS_MOUNT_POSIX;
1233 break;
1234 case Opt_cto:
1235 mnt->flags &= ~NFS_MOUNT_NOCTO;
1236 break;
1237 case Opt_nocto:
1238 mnt->flags |= NFS_MOUNT_NOCTO;
1239 break;
1240 case Opt_ac:
1241 mnt->flags &= ~NFS_MOUNT_NOAC;
1242 break;
1243 case Opt_noac:
1244 mnt->flags |= NFS_MOUNT_NOAC;
1245 break;
1246 case Opt_lock:
1247 mnt->flags &= ~NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001248 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1249 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001250 break;
1251 case Opt_nolock:
1252 mnt->flags |= NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001253 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1254 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001255 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001256 case Opt_udp:
1257 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001258 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001259 break;
1260 case Opt_tcp:
1261 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001262 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001263 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001264 case Opt_rdma:
1265 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1266 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001267 xprt_load_transport(p);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001268 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001269 case Opt_acl:
1270 mnt->flags &= ~NFS_MOUNT_NOACL;
1271 break;
1272 case Opt_noacl:
1273 mnt->flags |= NFS_MOUNT_NOACL;
1274 break;
1275 case Opt_rdirplus:
1276 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1277 break;
1278 case Opt_nordirplus:
1279 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1280 break;
Trond Myklebust75180df2007-05-16 16:53:28 -04001281 case Opt_sharecache:
1282 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1283 break;
1284 case Opt_nosharecache:
1285 mnt->flags |= NFS_MOUNT_UNSHARED;
1286 break;
Chuck Leverd7403512008-12-23 15:21:37 -05001287 case Opt_resvport:
1288 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1289 break;
1290 case Opt_noresvport:
1291 mnt->flags |= NFS_MOUNT_NORESVPORT;
1292 break;
David Howellsb797cac2009-04-03 16:42:48 +01001293 case Opt_fscache:
1294 mnt->options |= NFS_OPTION_FSCACHE;
1295 kfree(mnt->fscache_uniq);
1296 mnt->fscache_uniq = NULL;
1297 break;
1298 case Opt_nofscache:
1299 mnt->options &= ~NFS_OPTION_FSCACHE;
1300 kfree(mnt->fscache_uniq);
1301 mnt->fscache_uniq = NULL;
1302 break;
Chuck Lever89652612012-09-14 17:24:11 -04001303 case Opt_migration:
1304 mnt->options |= NFS_OPTION_MIGRATION;
1305 break;
1306 case Opt_nomigration:
1307 mnt->options &= NFS_OPTION_MIGRATION;
1308 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001309
Chuck Leverf45663c2008-06-24 19:28:02 -04001310 /*
1311 * options that take numeric values
1312 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001313 case Opt_port:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001314 if (nfs_get_option_ul(args, &option) ||
1315 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001316 goto out_invalid_value;
1317 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001318 break;
1319 case Opt_rsize:
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->rsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001323 break;
1324 case Opt_wsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001325 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001326 goto out_invalid_value;
1327 mnt->wsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001328 break;
1329 case Opt_bsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001330 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001331 goto out_invalid_value;
1332 mnt->bsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001333 break;
1334 case Opt_timeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001335 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001336 goto out_invalid_value;
1337 mnt->timeo = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001338 break;
1339 case Opt_retrans:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001340 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001341 goto out_invalid_value;
1342 mnt->retrans = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001343 break;
1344 case Opt_acregmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001345 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001346 goto out_invalid_value;
1347 mnt->acregmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001348 break;
1349 case Opt_acregmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001350 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001351 goto out_invalid_value;
1352 mnt->acregmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001353 break;
1354 case Opt_acdirmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001355 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001356 goto out_invalid_value;
1357 mnt->acdirmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001358 break;
1359 case Opt_acdirmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001360 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001361 goto out_invalid_value;
1362 mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001363 break;
1364 case Opt_actimeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001365 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001366 goto out_invalid_value;
1367 mnt->acregmin = mnt->acregmax =
1368 mnt->acdirmin = mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001369 break;
1370 case Opt_namelen:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001371 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001372 goto out_invalid_value;
1373 mnt->namlen = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001374 break;
1375 case Opt_mountport:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001376 if (nfs_get_option_ul(args, &option) ||
1377 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001378 goto out_invalid_value;
1379 mnt->mount_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001380 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001381 case Opt_mountvers:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001382 if (nfs_get_option_ul(args, &option) ||
Chuck Leverf45663c2008-06-24 19:28:02 -04001383 option < NFS_MNT_VERSION ||
Chuck Leverd23c45f2009-06-17 18:02:13 -07001384 option > NFS_MNT3_VERSION)
1385 goto out_invalid_value;
1386 mnt->mount_server.version = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001387 break;
Mike Sager3fd5be92009-04-01 09:21:48 -04001388 case Opt_minorversion:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001389 if (nfs_get_option_ul(args, &option))
Chuck Leverf3f4f4e2009-08-09 15:09:29 -04001390 goto out_invalid_value;
1391 if (option > NFS4_MAX_MINOR_VERSION)
1392 goto out_invalid_value;
1393 mnt->minorversion = option;
Mike Sager3fd5be92009-04-01 09:21:48 -04001394 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001395
Chuck Leverf45663c2008-06-24 19:28:02 -04001396 /*
1397 * options that take text values
1398 */
Trond Myklebust0d71b052012-03-02 13:59:49 -05001399 case Opt_nfsvers:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
1403 rc = nfs_parse_version_string(string, mnt, args);
1404 kfree(string);
1405 if (!rc)
1406 goto out_invalid_value;
1407 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001408 case Opt_sec:
1409 string = match_strdup(args);
1410 if (string == NULL)
1411 goto out_nomem;
Chuck Lever01060c82008-06-24 16:33:38 -04001412 rc = nfs_parse_security_flavors(string, mnt);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001413 kfree(string);
Chuck Leverf45663c2008-06-24 19:28:02 -04001414 if (!rc) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001415 dfprintk(MOUNT, "NFS: unrecognized "
1416 "security flavor\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001417 return 0;
Chuck Leverf45663c2008-06-24 19:28:02 -04001418 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001419 break;
1420 case Opt_proto:
1421 string = match_strdup(args);
1422 if (string == NULL)
1423 goto out_nomem;
1424 token = match_token(string,
1425 nfs_xprt_protocol_tokens, args);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001426
Jeff Laytonee671b02009-12-03 15:58:56 -05001427 protofamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001428 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001429 case Opt_xprt_udp6:
1430 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001431 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001432 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001433 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001434 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001435 case Opt_xprt_tcp6:
1436 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001437 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001438 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001439 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001440 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001441 case Opt_xprt_rdma:
1442 /* vector side protocols to TCP */
1443 mnt->flags |= NFS_MOUNT_TCP;
1444 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001445 xprt_load_transport(string);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001446 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001447 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001448 dfprintk(MOUNT, "NFS: unrecognized "
1449 "transport protocol\n");
Yinghai Lu4223a4a2009-10-20 14:13:46 +09001450 kfree(string);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001451 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001452 }
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001453 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001454 break;
1455 case Opt_mountproto:
1456 string = match_strdup(args);
1457 if (string == NULL)
1458 goto out_nomem;
1459 token = match_token(string,
1460 nfs_xprt_protocol_tokens, args);
Trond Myklebustd508afb2009-04-06 16:41:35 -07001461 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001462
Jeff Laytonee671b02009-12-03 15:58:56 -05001463 mountfamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001464 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001465 case Opt_xprt_udp6:
1466 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001467 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001468 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001469 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001470 case Opt_xprt_tcp6:
1471 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001472 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001473 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001474 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001475 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001476 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001477 dfprintk(MOUNT, "NFS: unrecognized "
1478 "transport protocol\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001479 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001480 }
1481 break;
1482 case Opt_addr:
1483 string = match_strdup(args);
1484 if (string == NULL)
1485 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001486 mnt->nfs_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001487 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001488 (struct sockaddr *)
1489 &mnt->nfs_server.address,
1490 sizeof(mnt->nfs_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001491 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001492 if (mnt->nfs_server.addrlen == 0)
1493 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001494 break;
1495 case Opt_clientaddr:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001496 if (nfs_get_option_str(args, &mnt->client_address))
Chuck Leverbf0fd762007-07-01 12:13:44 -04001497 goto out_nomem;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001498 break;
Chuck Lever33832032007-12-10 14:59:13 -05001499 case Opt_mounthost:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001500 if (nfs_get_option_str(args,
1501 &mnt->mount_server.hostname))
Chuck Lever33832032007-12-10 14:59:13 -05001502 goto out_nomem;
Chuck Lever33832032007-12-10 14:59:13 -05001503 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001504 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001505 string = match_strdup(args);
1506 if (string == NULL)
1507 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001508 mnt->mount_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001509 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001510 (struct sockaddr *)
1511 &mnt->mount_server.address,
1512 sizeof(mnt->mount_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001513 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001514 if (mnt->mount_server.addrlen == 0)
1515 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001516 break;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001517 case Opt_lookupcache:
1518 string = match_strdup(args);
1519 if (string == NULL)
1520 goto out_nomem;
1521 token = match_token(string,
1522 nfs_lookupcache_tokens, args);
1523 kfree(string);
1524 switch (token) {
1525 case Opt_lookupcache_all:
1526 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1527 break;
1528 case Opt_lookupcache_positive:
1529 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1530 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1531 break;
1532 case Opt_lookupcache_none:
1533 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1534 break;
1535 default:
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001536 dfprintk(MOUNT, "NFS: invalid "
1537 "lookupcache argument\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001538 return 0;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001539 };
1540 break;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001541 case Opt_fscache_uniq:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001542 if (nfs_get_option_str(args, &mnt->fscache_uniq))
Chuck Levera6d5ff62010-05-07 13:33:58 -04001543 goto out_nomem;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001544 mnt->options |= NFS_OPTION_FSCACHE;
1545 break;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001546 case Opt_local_lock:
1547 string = match_strdup(args);
1548 if (string == NULL)
1549 goto out_nomem;
1550 token = match_token(string, nfs_local_lock_tokens,
1551 args);
1552 kfree(string);
1553 switch (token) {
1554 case Opt_local_lock_all:
1555 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 case Opt_local_lock_flock:
1559 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1560 break;
1561 case Opt_local_lock_posix:
1562 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1563 break;
1564 case Opt_local_lock_none:
1565 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1566 NFS_MOUNT_LOCAL_FCNTL);
1567 break;
1568 default:
1569 dfprintk(MOUNT, "NFS: invalid "
1570 "local_lock argument\n");
1571 return 0;
1572 };
1573 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001574
Chuck Leverf45663c2008-06-24 19:28:02 -04001575 /*
1576 * Special options
1577 */
1578 case Opt_sloppy:
1579 sloppy = 1;
1580 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1581 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001582 case Opt_userspace:
1583 case Opt_deprecated:
Chuck Leverd33e4df2008-06-12 12:37:41 -04001584 dfprintk(MOUNT, "NFS: ignoring mount option "
1585 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001586 break;
1587
1588 default:
Chuck Leverd23c45f2009-06-17 18:02:13 -07001589 invalid_option = 1;
Chuck Leverf45663c2008-06-24 19:28:02 -04001590 dfprintk(MOUNT, "NFS: unrecognized mount option "
1591 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001592 }
1593 }
1594
Chuck Leverd23c45f2009-06-17 18:02:13 -07001595 if (!sloppy && invalid_option)
1596 return 0;
1597
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001598 if (mnt->minorversion && mnt->version != 4)
1599 goto out_minorversion_mismatch;
1600
Chuck Lever89652612012-09-14 17:24:11 -04001601 if (mnt->options & NFS_OPTION_MIGRATION &&
1602 mnt->version != 4 && mnt->minorversion != 0)
1603 goto out_migration_misuse;
1604
Jeff Laytonee671b02009-12-03 15:58:56 -05001605 /*
1606 * verify that any proto=/mountproto= options match the address
Peter Meerwald1856b222012-08-18 17:38:54 +02001607 * families in the addr=/mountaddr= options.
Jeff Laytonee671b02009-12-03 15:58:56 -05001608 */
1609 if (protofamily != AF_UNSPEC &&
1610 protofamily != mnt->nfs_server.address.ss_family)
1611 goto out_proto_mismatch;
1612
1613 if (mountfamily != AF_UNSPEC) {
1614 if (mnt->mount_server.addrlen) {
1615 if (mountfamily != mnt->mount_server.address.ss_family)
1616 goto out_mountproto_mismatch;
1617 } else {
1618 if (mountfamily != mnt->nfs_server.address.ss_family)
1619 goto out_mountproto_mismatch;
1620 }
1621 }
1622
Chuck Leverbf0fd762007-07-01 12:13:44 -04001623 return 1;
1624
Jeff Laytonee671b02009-12-03 15:58:56 -05001625out_mountproto_mismatch:
1626 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1627 "option\n");
1628 return 0;
1629out_proto_mismatch:
1630 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1631 return 0;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001632out_invalid_address:
1633 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1634 return 0;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001635out_invalid_value:
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001636 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001637 return 0;
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001638out_minorversion_mismatch:
1639 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1640 "minorversion=%u\n", mnt->version, mnt->minorversion);
1641 return 0;
Chuck Lever89652612012-09-14 17:24:11 -04001642out_migration_misuse:
1643 printk(KERN_INFO
1644 "NFS: 'migration' not supported for this NFS version\n");
1645 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001646out_nomem:
1647 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1648 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001649out_security_failure:
1650 free_secdata(secdata);
1651 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1652 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001653}
1654
1655/*
Chuck Leverec88f282009-08-09 15:09:32 -04001656 * Match the requested auth flavors with the list returned by
1657 * the server. Returns zero and sets the mount's authentication
1658 * flavor on success; returns -EACCES if server does not support
1659 * the requested flavor.
1660 */
1661static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1662 struct nfs_mount_request *request)
1663{
1664 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1665
1666 /*
Chuck Lever5eecfde2009-08-21 17:50:30 -04001667 * Certain releases of Linux's mountd return an empty
1668 * flavor list. To prevent behavioral regression with
1669 * these servers (ie. rejecting mounts that used to
1670 * succeed), revert to pre-2.6.32 behavior (no checking)
1671 * if the returned flavor list is empty.
1672 */
1673 if (server_authlist_len == 0)
1674 return 0;
1675
1676 /*
Chuck Leverec88f282009-08-09 15:09:32 -04001677 * We avoid sophisticated negotiating here, as there are
1678 * plenty of cases where we can get it wrong, providing
1679 * either too little or too much security.
1680 *
1681 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1682 * flavor listed first. However, some servers list
1683 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1684 * preferred default, in args->auth_flavors[0] if user
1685 * didn't specify sec= mount option.
1686 */
1687 for (i = 0; i < args->auth_flavor_len; i++)
1688 for (j = 0; j < server_authlist_len; j++)
1689 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1690 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1691 request->auth_flavs[j]);
1692 args->auth_flavors[0] = request->auth_flavs[j];
1693 return 0;
1694 }
1695
1696 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1697 nfs_umount(request);
1698 return -EACCES;
1699}
1700
1701/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001702 * Use the remote server's MOUNT service to request the NFS file handle
1703 * corresponding to the provided path.
1704 */
Bryan Schumaker486aa692012-05-10 15:07:39 -04001705static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1706 struct nfs_fh *root_fh)
Chuck Lever0076d7b2007-07-01 12:13:49 -04001707{
Chuck Leverec88f282009-08-09 15:09:32 -04001708 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1709 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
Chuck Leverc5d120f2008-12-23 15:21:35 -05001710 struct nfs_mount_request request = {
1711 .sap = (struct sockaddr *)
1712 &args->mount_server.address,
1713 .dirpath = args->nfs_server.export_path,
1714 .protocol = args->mount_server.protocol,
1715 .fh = root_fh,
Chuck Lever50a737f2008-12-23 15:21:37 -05001716 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
Chuck Leverec88f282009-08-09 15:09:32 -04001717 .auth_flav_len = &server_authlist_len,
1718 .auth_flavs = server_authlist,
Stanislav Kinsbursky6d59b8d2012-01-10 16:12:54 +04001719 .net = args->net,
Chuck Leverc5d120f2008-12-23 15:21:35 -05001720 };
Chuck Lever4c568012007-12-10 14:59:28 -05001721 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001722
1723 if (args->mount_server.version == 0) {
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001724 switch (args->version) {
1725 default:
1726 args->mount_server.version = NFS_MNT3_VERSION;
1727 break;
1728 case 2:
1729 args->mount_server.version = NFS_MNT_VERSION;
1730 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001731 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001732 request.version = args->mount_server.version;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001733
Chuck Lever33832032007-12-10 14:59:13 -05001734 if (args->mount_server.hostname)
Chuck Leverc5d120f2008-12-23 15:21:35 -05001735 request.hostname = args->mount_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001736 else
Chuck Leverc5d120f2008-12-23 15:21:35 -05001737 request.hostname = args->nfs_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001738
Chuck Lever0076d7b2007-07-01 12:13:49 -04001739 /*
1740 * Construct the mount server's address.
1741 */
Chuck Lever4c568012007-12-10 14:59:28 -05001742 if (args->mount_server.address.ss_family == AF_UNSPEC) {
Chuck Leverc5d120f2008-12-23 15:21:35 -05001743 memcpy(request.sap, &args->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -05001744 args->nfs_server.addrlen);
1745 args->mount_server.addrlen = args->nfs_server.addrlen;
1746 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001747 request.salen = args->mount_server.addrlen;
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001748 nfs_set_port(request.sap, &args->mount_server.port, 0);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001749
1750 /*
1751 * Now ask the mount server to map our export path
1752 * to a file handle.
1753 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001754 status = nfs_mount(&request);
Chuck Leverec88f282009-08-09 15:09:32 -04001755 if (status != 0) {
1756 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1757 request.hostname, status);
1758 return status;
1759 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001760
Chuck Leverec88f282009-08-09 15:09:32 -04001761 /*
1762 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1763 */
1764 if (args->mount_server.version != NFS_MNT3_VERSION)
1765 return 0;
1766 return nfs_walk_authlist(args, &request);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001767}
1768
Bryan Schumakerff9099f22012-07-30 16:05:18 -04001769struct dentry *nfs_try_mount(int flags, const char *dev_name,
1770 struct nfs_mount_info *mount_info,
1771 struct nfs_subversion *nfs_mod)
Bryan Schumaker486aa692012-05-10 15:07:39 -04001772{
1773 int status;
1774 struct nfs_server *server;
1775
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001776 if (mount_info->parsed->need_mount) {
Bryan Schumaker87c70832012-05-10 15:07:43 -04001777 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001778 if (status)
1779 return ERR_PTR(status);
1780 }
Bryan Schumaker486aa692012-05-10 15:07:39 -04001781
1782 /* Get a volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001783 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001784 if (IS_ERR(server))
1785 return ERR_CAST(server);
1786
Bryan Schumakerab7017a2012-07-30 16:05:16 -04001787 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001788}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001789EXPORT_SYMBOL_GPL(nfs_try_mount);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001790
Rob Landleyc12bace2011-03-09 15:54:13 -06001791/*
1792 * Split "dev_name" into "hostname:export_path".
1793 *
1794 * The leftmost colon demarks the split between the server's hostname
1795 * and the export path. If the hostname starts with a left square
1796 * bracket, then it may contain colons.
1797 *
1798 * Note: caller frees hostname and export path, even on error.
1799 */
1800static int nfs_parse_devname(const char *dev_name,
1801 char **hostname, size_t maxnamlen,
1802 char **export_path, size_t maxpathlen)
Chuck Leverdc045892008-06-23 12:36:37 -04001803{
1804 size_t len;
Rob Landleyc12bace2011-03-09 15:54:13 -06001805 char *end;
Chuck Leverdc045892008-06-23 12:36:37 -04001806
Rob Landleyc12bace2011-03-09 15:54:13 -06001807 /* Is the host name protected with square brakcets? */
1808 if (*dev_name == '[') {
1809 end = strchr(++dev_name, ']');
1810 if (end == NULL || end[1] != ':')
1811 goto out_bad_devname;
Chuck Leverdc045892008-06-23 12:36:37 -04001812
Rob Landleyc12bace2011-03-09 15:54:13 -06001813 len = end - dev_name;
1814 end++;
1815 } else {
1816 char *comma;
1817
1818 end = strchr(dev_name, ':');
1819 if (end == NULL)
1820 goto out_bad_devname;
1821 len = end - dev_name;
1822
1823 /* kill possible hostname list: not supported */
1824 comma = strchr(dev_name, ',');
1825 if (comma != NULL && comma < end)
1826 *comma = 0;
1827 }
1828
Chuck Leverdc045892008-06-23 12:36:37 -04001829 if (len > maxnamlen)
1830 goto out_hostname;
1831
1832 /* N.B. caller will free nfs_server.hostname in all cases */
1833 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
Rob Landleyc12bace2011-03-09 15:54:13 -06001834 if (*hostname == NULL)
Chuck Leverdc045892008-06-23 12:36:37 -04001835 goto out_nomem;
Rob Landleyc12bace2011-03-09 15:54:13 -06001836 len = strlen(++end);
Chuck Leverdc045892008-06-23 12:36:37 -04001837 if (len > maxpathlen)
1838 goto out_path;
Rob Landleyc12bace2011-03-09 15:54:13 -06001839 *export_path = kstrndup(end, len, GFP_KERNEL);
Chuck Leverdc045892008-06-23 12:36:37 -04001840 if (!*export_path)
1841 goto out_nomem;
1842
1843 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1844 return 0;
1845
1846out_bad_devname:
1847 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1848 return -EINVAL;
1849
1850out_nomem:
1851 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1852 return -ENOMEM;
1853
1854out_hostname:
1855 dfprintk(MOUNT, "NFS: server hostname too long\n");
1856 return -ENAMETOOLONG;
1857
1858out_path:
1859 dfprintk(MOUNT, "NFS: export pathname too long\n");
1860 return -ENAMETOOLONG;
1861}
1862
1863/*
David Howells54ceac42006-08-22 20:06:13 -04001864 * Validate the NFS2/NFS3 mount data
1865 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001866 *
1867 * For option strings, user space handles the following behaviors:
1868 *
1869 * + DNS: mapping server host name to IP address ("addr=" option)
1870 *
1871 * + failure mode: how to behave if a mount request can't be handled
1872 * immediately ("fg/bg" option)
1873 *
1874 * + retry: how often to retry a mount request ("retry=" option)
1875 *
1876 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1877 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001878 */
Bryan Schumakerd72c7272012-05-10 15:07:41 -04001879static int nfs23_validate_mount_data(void *options,
1880 struct nfs_parsed_mount_data *args,
1881 struct nfs_fh *mntfh,
1882 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001883{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001884 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001885 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
Chuck Lever136d5582007-07-01 12:13:54 -04001886
Chuck Lever5df36e72007-07-01 12:12:56 -04001887 if (data == NULL)
1888 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001889
Bryan Schumakerc5afc8d2012-06-08 11:32:56 -04001890 args->version = NFS_DEFAULT_VERSION;
David Howellsf7b422b2006-06-09 09:34:33 -04001891 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001892 case 1:
1893 data->namlen = 0;
1894 case 2:
1895 data->bsize = 0;
1896 case 3:
1897 if (data->flags & NFS_MOUNT_VER3)
1898 goto out_no_v3;
1899 data->root.size = NFS2_FHSIZE;
1900 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1901 case 4:
1902 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1903 goto out_no_sec;
1904 case 5:
1905 memset(data->context, 0, sizeof(data->context));
1906 case 6:
Trond Myklebustb7e24452008-06-19 15:21:11 -04001907 if (data->flags & NFS_MOUNT_VER3) {
1908 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1909 goto out_invalid_fh;
Chuck Lever5df36e72007-07-01 12:12:56 -04001910 mntfh->size = data->root.size;
Chuck Lever764302c2009-09-08 19:50:03 -04001911 args->version = 3;
1912 } else {
Chuck Lever5df36e72007-07-01 12:12:56 -04001913 mntfh->size = NFS2_FHSIZE;
Chuck Lever764302c2009-09-08 19:50:03 -04001914 args->version = 2;
1915 }
Chuck Lever5df36e72007-07-01 12:12:56 -04001916
Chuck Lever5df36e72007-07-01 12:12:56 -04001917
1918 memcpy(mntfh->data, data->root.data, mntfh->size);
1919 if (mntfh->size < sizeof(mntfh->data))
1920 memset(mntfh->data + mntfh->size, 0,
1921 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001922
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001923 /*
1924 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1925 * can deal with.
1926 */
Trond Myklebustff3525a2008-08-15 16:59:14 -04001927 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -04001928 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001929 args->rsize = data->rsize;
1930 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001931 args->timeo = data->timeo;
1932 args->retrans = data->retrans;
1933 args->acregmin = data->acregmin;
1934 args->acregmax = data->acregmax;
1935 args->acdirmin = data->acdirmin;
1936 args->acdirmax = data->acdirmax;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001937 args->need_mount = false;
Chuck Lever4c568012007-12-10 14:59:28 -05001938
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001939 memcpy(sap, &data->addr, sizeof(data->addr));
Chuck Lever4c568012007-12-10 14:59:28 -05001940 args->nfs_server.addrlen = sizeof(data->addr);
Trond Myklebust872ece82012-09-04 11:05:07 -04001941 args->nfs_server.port = ntohs(data->addr.sin_port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001942 if (!nfs_verify_server_address(sap))
Chuck Lever4c568012007-12-10 14:59:28 -05001943 goto out_no_address;
1944
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001945 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001946 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001947 /* N.B. caller will free nfs_server.hostname in all cases */
1948 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1949 args->namlen = data->namlen;
1950 args->bsize = data->bsize;
Chuck Leverdd07c942008-06-24 16:33:46 -04001951
1952 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1953 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001954 if (!args->nfs_server.hostname)
1955 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001956
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001957 if (!(data->flags & NFS_MOUNT_NONLM))
1958 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1959 NFS_MOUNT_LOCAL_FCNTL);
1960 else
1961 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1962 NFS_MOUNT_LOCAL_FCNTL);
Eric Parisf9c3a382008-03-05 14:20:18 -05001963 /*
1964 * The legacy version 6 binary mount data from userspace has a
1965 * field used only to transport selinux information into the
1966 * the kernel. To continue to support that functionality we
1967 * have a touch of selinux knowledge here in the NFS code. The
1968 * userspace code converted context=blah to just blah so we are
1969 * converting back to the full string selinux understands.
1970 */
1971 if (data->context[0]){
1972#ifdef CONFIG_SECURITY_SELINUX
1973 int rc;
1974 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1975 if (!opts_str)
1976 return -ENOMEM;
1977 strcpy(opts_str, "context=");
1978 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1979 strcat(opts_str, &data->context[0]);
1980 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1981 kfree(opts_str);
1982 if (rc)
1983 return rc;
1984#else
1985 return -EINVAL;
1986#endif
1987 }
1988
Chuck Lever5df36e72007-07-01 12:12:56 -04001989 break;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001990 default:
1991 return NFS_TEXT_DATA;
David Howellsf7b422b2006-06-09 09:34:33 -04001992 }
David Howells54ceac42006-08-22 20:06:13 -04001993
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04001994#if !IS_ENABLED(CONFIG_NFS_V3)
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001995 if (args->version == 3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001996 goto out_v3_not_compiled;
1997#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001998
David Howells54ceac42006-08-22 20:06:13 -04001999 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04002000
2001out_no_data:
2002 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2003 return -EINVAL;
2004
2005out_no_v3:
2006 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2007 data->version);
2008 return -EINVAL;
2009
2010out_no_sec:
2011 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2012 return -EINVAL;
2013
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04002014#if !IS_ENABLED(CONFIG_NFS_V3)
Chuck Lever5df36e72007-07-01 12:12:56 -04002015out_v3_not_compiled:
2016 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2017 return -EPROTONOSUPPORT;
2018#endif /* !CONFIG_NFS_V3 */
2019
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04002020out_nomem:
2021 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2022 return -ENOMEM;
2023
Chuck Lever5df36e72007-07-01 12:12:56 -04002024out_no_address:
2025 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2026 return -EINVAL;
2027
2028out_invalid_fh:
2029 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2030 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04002031}
2032
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002033#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerd72c7272012-05-10 15:07:41 -04002034static int nfs_validate_mount_data(struct file_system_type *fs_type,
2035 void *options,
2036 struct nfs_parsed_mount_data *args,
2037 struct nfs_fh *mntfh,
2038 const char *dev_name)
2039{
2040 if (fs_type == &nfs_fs_type)
2041 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2042 return nfs4_validate_mount_data(options, args, dev_name);
2043}
2044#else
2045static int nfs_validate_mount_data(struct file_system_type *fs_type,
2046 void *options,
2047 struct nfs_parsed_mount_data *args,
2048 struct nfs_fh *mntfh,
2049 const char *dev_name)
2050{
2051 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2052}
2053#endif
2054
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002055static int nfs_validate_text_mount_data(void *options,
2056 struct nfs_parsed_mount_data *args,
2057 const char *dev_name)
2058{
2059 int port = 0;
2060 int max_namelen = PAGE_SIZE;
2061 int max_pathlen = NFS_MAXPATHLEN;
2062 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2063
2064 if (nfs_parse_mount_options((char *)options, args) == 0)
2065 return -EINVAL;
2066
2067 if (!nfs_verify_server_address(sap))
2068 goto out_no_address;
2069
2070 if (args->version == 4) {
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002071#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002072 port = NFS_PORT;
2073 max_namelen = NFS4_MAXNAMLEN;
2074 max_pathlen = NFS4_MAXPATHLEN;
2075 nfs_validate_transport_protocol(args);
2076 nfs4_validate_mount_flags(args);
2077#else
2078 goto out_v4_not_compiled;
2079#endif /* CONFIG_NFS_V4 */
2080 } else
2081 nfs_set_mount_transport_protocol(args);
2082
2083 nfs_set_port(sap, &args->nfs_server.port, port);
2084
2085 if (args->auth_flavor_len > 1)
2086 goto out_bad_auth;
2087
2088 return nfs_parse_devname(dev_name,
2089 &args->nfs_server.hostname,
2090 max_namelen,
2091 &args->nfs_server.export_path,
2092 max_pathlen);
2093
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002094#if !IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002095out_v4_not_compiled:
2096 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2097 return -EPROTONOSUPPORT;
2098#endif /* !CONFIG_NFS_V4 */
2099
2100out_no_address:
2101 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2102 return -EINVAL;
2103
2104out_bad_auth:
2105 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2106 return -EINVAL;
2107}
2108
Jeff Layton48b605f2008-06-10 15:38:39 -04002109static int
2110nfs_compare_remount_data(struct nfs_server *nfss,
2111 struct nfs_parsed_mount_data *data)
2112{
2113 if (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 ||
Stefan Richtera1be9ee2009-10-12 11:26:12 -04002125 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2126 (struct sockaddr *)&nfss->nfs_client->cl_addr))
Jeff Layton48b605f2008-06-10 15:38:39 -04002127 return -EINVAL;
2128
2129 return 0;
2130}
2131
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002132int
Jeff Layton48b605f2008-06-10 15:38:39 -04002133nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2134{
2135 int error;
2136 struct nfs_server *nfss = sb->s_fs_info;
2137 struct nfs_parsed_mount_data *data;
2138 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2139 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
Trond Myklebustcd100722008-06-17 16:12:00 -04002140 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
Jeff Layton48b605f2008-06-10 15:38:39 -04002141
2142 /*
2143 * Userspace mount programs that send binary options generally send
2144 * them populated with default values. We have no way to know which
2145 * ones were explicitly specified. Fall back to legacy behavior and
2146 * just return success.
2147 */
Marc Zyngier31c94462008-07-17 13:21:55 +02002148 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2149 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2150 options->version <= 6))))
Jeff Layton48b605f2008-06-10 15:38:39 -04002151 return 0;
2152
2153 data = kzalloc(sizeof(*data), GFP_KERNEL);
2154 if (data == NULL)
2155 return -ENOMEM;
2156
2157 /* fill out struct with values from existing mount */
2158 data->flags = nfss->flags;
2159 data->rsize = nfss->rsize;
2160 data->wsize = nfss->wsize;
2161 data->retrans = nfss->client->cl_timeout->to_retries;
2162 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2163 data->acregmin = nfss->acregmin / HZ;
2164 data->acregmax = nfss->acregmax / HZ;
2165 data->acdirmin = nfss->acdirmin / HZ;
2166 data->acdirmax = nfss->acdirmax / HZ;
2167 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
Trond Myklebustbcd2ea12009-10-06 15:41:22 -04002168 data->nfs_server.port = nfss->port;
Jeff Layton48b605f2008-06-10 15:38:39 -04002169 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2170 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2171 data->nfs_server.addrlen);
2172
2173 /* overwrite those values with any that were specified */
2174 error = nfs_parse_mount_options((char *)options, data);
2175 if (error < 0)
2176 goto out;
2177
Jeff Layton26c4c172011-04-27 11:49:09 -04002178 /*
2179 * noac is a special case. It implies -o sync, but that's not
2180 * necessarily reflected in the mtab options. do_remount_sb
2181 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2182 * remount options, so we have to explicitly reset it.
2183 */
2184 if (data->flags & NFS_MOUNT_NOAC)
2185 *flags |= MS_SYNCHRONOUS;
2186
Jeff Layton48b605f2008-06-10 15:38:39 -04002187 /* compare new mount options with old ones */
2188 error = nfs_compare_remount_data(nfss, data);
2189out:
2190 kfree(data);
2191 return error;
2192}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002193EXPORT_SYMBOL_GPL(nfs_remount);
Jeff Layton48b605f2008-06-10 15:38:39 -04002194
David Howells54ceac42006-08-22 20:06:13 -04002195/*
2196 * Initialise the common bits of the superblock
2197 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002198inline void nfs_initialise_sb(struct super_block *sb)
David Howells54ceac42006-08-22 20:06:13 -04002199{
2200 struct nfs_server *server = NFS_SB(sb);
2201
2202 sb->s_magic = NFS_SUPER_MAGIC;
2203
2204 /* We probably want something more informative here */
2205 snprintf(sb->s_id, sizeof(sb->s_id),
Vivek Trivedi5a7c9ee2012-03-15 23:58:52 +05302206 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
David Howells54ceac42006-08-22 20:06:13 -04002207
2208 if (sb->s_blocksize == 0)
2209 sb->s_blocksize = nfs_block_bits(server->wsize,
2210 &sb->s_blocksize_bits);
2211
Jens Axboe32a88aa2009-09-16 15:02:33 +02002212 sb->s_bdi = &server->backing_dev_info;
2213
David Howells54ceac42006-08-22 20:06:13 -04002214 nfs_super_set_maxbytes(sb, server->maxfilesize);
2215}
2216
2217/*
2218 * Finish setting up an NFS2/3 superblock
2219 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002220void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002221{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002222 struct nfs_parsed_mount_data *data = mount_info->parsed;
David Howells54ceac42006-08-22 20:06:13 -04002223 struct nfs_server *server = NFS_SB(sb);
2224
2225 sb->s_blocksize_bits = 0;
2226 sb->s_blocksize = 0;
Bryan Schumaker6a744902012-07-30 16:05:20 -04002227 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2228 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2229 if (data && data->bsize)
David Howells54ceac42006-08-22 20:06:13 -04002230 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2231
Bryan Schumaker6a744902012-07-30 16:05:20 -04002232 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002233 /* The VFS shouldn't apply the umask to mode bits. We will do
2234 * so ourselves when necessary.
2235 */
2236 sb->s_flags |= MS_POSIXACL;
2237 sb->s_time_gran = 1;
2238 }
2239
David Howells54ceac42006-08-22 20:06:13 -04002240 nfs_initialise_sb(sb);
2241}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002242EXPORT_SYMBOL_GPL(nfs_fill_super);
David Howells54ceac42006-08-22 20:06:13 -04002243
2244/*
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002245 * Finish setting up a cloned NFS2/3/4 superblock
David Howells54ceac42006-08-22 20:06:13 -04002246 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002247void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002248{
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002249 const struct super_block *old_sb = mount_info->cloned->sb;
David Howells54ceac42006-08-22 20:06:13 -04002250 struct nfs_server *server = NFS_SB(sb);
2251
2252 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2253 sb->s_blocksize = old_sb->s_blocksize;
2254 sb->s_maxbytes = old_sb->s_maxbytes;
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002255 sb->s_xattr = old_sb->s_xattr;
2256 sb->s_op = old_sb->s_op;
2257 sb->s_time_gran = 1;
David Howells54ceac42006-08-22 20:06:13 -04002258
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002259 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002260 /* The VFS shouldn't apply the umask to mode bits. We will do
2261 * so ourselves when necessary.
2262 */
2263 sb->s_flags |= MS_POSIXACL;
David Howells54ceac42006-08-22 20:06:13 -04002264 }
2265
David Howells54ceac42006-08-22 20:06:13 -04002266 nfs_initialise_sb(sb);
2267}
2268
Trond Myklebust275a5d22007-05-16 16:53:28 -04002269static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2270{
2271 const struct nfs_server *a = s->s_fs_info;
2272 const struct rpc_clnt *clnt_a = a->client;
2273 const struct rpc_clnt *clnt_b = b->client;
2274
2275 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2276 goto Ebusy;
2277 if (a->nfs_client != b->nfs_client)
2278 goto Ebusy;
2279 if (a->flags != b->flags)
2280 goto Ebusy;
2281 if (a->wsize != b->wsize)
2282 goto Ebusy;
2283 if (a->rsize != b->rsize)
2284 goto Ebusy;
2285 if (a->acregmin != b->acregmin)
2286 goto Ebusy;
2287 if (a->acregmax != b->acregmax)
2288 goto Ebusy;
2289 if (a->acdirmin != b->acdirmin)
2290 goto Ebusy;
2291 if (a->acdirmax != b->acdirmax)
2292 goto Ebusy;
2293 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2294 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002295 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04002296Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002297 return 0;
2298}
2299
2300struct nfs_sb_mountdata {
2301 struct nfs_server *server;
2302 int mntflags;
2303};
2304
2305static int nfs_set_super(struct super_block *s, void *data)
2306{
2307 struct nfs_sb_mountdata *sb_mntdata = data;
2308 struct nfs_server *server = sb_mntdata->server;
2309 int ret;
2310
2311 s->s_flags = sb_mntdata->mntflags;
2312 s->s_fs_info = server;
Al Viro8b244ff2010-12-18 11:29:39 -05002313 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002314 ret = set_anon_super(s, server);
2315 if (ret == 0)
2316 server->s_dev = s->s_dev;
2317 return ret;
2318}
2319
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002320static int nfs_compare_super_address(struct nfs_server *server1,
2321 struct nfs_server *server2)
2322{
2323 struct sockaddr *sap1, *sap2;
2324
2325 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2326 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2327
2328 if (sap1->sa_family != sap2->sa_family)
2329 return 0;
2330
2331 switch (sap1->sa_family) {
2332 case AF_INET: {
2333 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2334 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2335 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2336 return 0;
2337 if (sin1->sin_port != sin2->sin_port)
2338 return 0;
2339 break;
2340 }
2341 case AF_INET6: {
2342 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2343 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2344 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2345 return 0;
2346 if (sin1->sin6_port != sin2->sin6_port)
2347 return 0;
2348 break;
2349 }
2350 default:
2351 return 0;
2352 }
2353
2354 return 1;
2355}
2356
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002357static int nfs_compare_super(struct super_block *sb, void *data)
2358{
2359 struct nfs_sb_mountdata *sb_mntdata = data;
2360 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2361 int mntflags = sb_mntdata->mntflags;
2362
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002363 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002364 return 0;
2365 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2366 if (old->flags & NFS_MOUNT_UNSHARED)
2367 return 0;
2368 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2369 return 0;
2370 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04002371}
2372
Trond Myklebust39ffb922012-05-16 10:21:30 -07002373#ifdef CONFIG_NFS_FSCACHE
Bryan Schumaker2311b942012-05-10 15:07:32 -04002374static void nfs_get_cache_cookie(struct super_block *sb,
2375 struct nfs_parsed_mount_data *parsed,
2376 struct nfs_clone_mount *cloned)
2377{
Trond Myklebustc4271c62012-12-21 11:02:32 -05002378 struct nfs_server *nfss = NFS_SB(sb);
Bryan Schumaker2311b942012-05-10 15:07:32 -04002379 char *uniq = NULL;
2380 int ulen = 0;
2381
Trond Myklebustc4271c62012-12-21 11:02:32 -05002382 nfss->fscache_key = NULL;
2383 nfss->fscache = NULL;
2384
2385 if (parsed) {
2386 if (!(parsed->options & NFS_OPTION_FSCACHE))
2387 return;
2388 if (parsed->fscache_uniq) {
2389 uniq = parsed->fscache_uniq;
2390 ulen = strlen(parsed->fscache_uniq);
2391 }
Bryan Schumaker2311b942012-05-10 15:07:32 -04002392 } else if (cloned) {
2393 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
Trond Myklebustc4271c62012-12-21 11:02:32 -05002394 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2395 return;
Bryan Schumaker2311b942012-05-10 15:07:32 -04002396 if (mnt_s->fscache_key) {
2397 uniq = mnt_s->fscache_key->key.uniquifier;
2398 ulen = mnt_s->fscache_key->key.uniq_len;
2399 };
Trond Myklebustc4271c62012-12-21 11:02:32 -05002400 } else
2401 return;
Bryan Schumaker2311b942012-05-10 15:07:32 -04002402
2403 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2404}
Trond Myklebust39ffb922012-05-16 10:21:30 -07002405#else
2406static void nfs_get_cache_cookie(struct super_block *sb,
2407 struct nfs_parsed_mount_data *parsed,
2408 struct nfs_clone_mount *cloned)
2409{
2410}
2411#endif
Bryan Schumaker2311b942012-05-10 15:07:32 -04002412
Miklos Szeredifa799752008-04-30 00:54:33 -07002413static int nfs_bdi_register(struct nfs_server *server)
2414{
2415 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2416}
2417
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002418int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2419 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002420{
2421 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2422}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002423EXPORT_SYMBOL_GPL(nfs_set_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002424
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002425int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2426 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002427{
2428 /* clone any lsm security options from the parent to the new sb */
2429 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2430 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2431 return -ESTALE;
2432 return 0;
2433}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002434EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002435
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002436struct dentry *nfs_fs_mount_common(struct nfs_server *server,
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002437 int flags, const char *dev_name,
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002438 struct nfs_mount_info *mount_info,
2439 struct nfs_subversion *nfs_mod)
David Howells54ceac42006-08-22 20:06:13 -04002440{
David Howells54ceac42006-08-22 20:06:13 -04002441 struct super_block *s;
Al Viro01194982011-03-16 07:25:36 -04002442 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Trond Myklebust75180df2007-05-16 16:53:28 -04002443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002444 struct nfs_sb_mountdata sb_mntdata = {
2445 .mntflags = flags,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002446 .server = server,
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002447 };
Al Viro01194982011-03-16 07:25:36 -04002448 int error;
David Howells54ceac42006-08-22 20:06:13 -04002449
Trond Myklebust75180df2007-05-16 16:53:28 -04002450 if (server->flags & NFS_MOUNT_UNSHARED)
2451 compare_super = NULL;
2452
Sachin Prabhufb2088c2011-08-01 12:10:12 +01002453 /* -o noac implies -o sync */
2454 if (server->flags & NFS_MOUNT_NOAC)
2455 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2456
David Howells54ceac42006-08-22 20:06:13 -04002457 /* Get a superblock - note that we may end up sharing one that already exists */
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002458 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002459 if (IS_ERR(s)) {
Al Viro01194982011-03-16 07:25:36 -04002460 mntroot = ERR_CAST(s);
David Howells54ceac42006-08-22 20:06:13 -04002461 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04002462 }
2463
David Howells54ceac42006-08-22 20:06:13 -04002464 if (s->s_fs_info != server) {
2465 nfs_free_server(server);
2466 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002467 } else {
2468 error = nfs_bdi_register(server);
Al Viro01194982011-03-16 07:25:36 -04002469 if (error) {
2470 mntroot = ERR_PTR(error);
NeilBrowncfbc0682010-03-11 11:20:17 +11002471 goto error_splat_bdi;
Al Viro01194982011-03-16 07:25:36 -04002472 }
David Howellsf7b422b2006-06-09 09:34:33 -04002473 }
David Howells54ceac42006-08-22 20:06:13 -04002474
2475 if (!s->s_root) {
2476 /* initial superblock/root creation */
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002477 mount_info->fill_super(s, mount_info);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002478 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
David Howells54ceac42006-08-22 20:06:13 -04002479 }
2480
Bryan Schumaker87c70832012-05-10 15:07:43 -04002481 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
Al Viro01194982011-03-16 07:25:36 -04002482 if (IS_ERR(mntroot))
David Howells54ceac42006-08-22 20:06:13 -04002483 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002484
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002485 error = mount_info->set_security(s, mntroot, mount_info);
Eric Parisf9c3a382008-03-05 14:20:18 -05002486 if (error)
2487 goto error_splat_root;
2488
David Howellsf7b422b2006-06-09 09:34:33 -04002489 s->s_flags |= MS_ACTIVE;
Chuck Lever06559602007-07-01 12:12:35 -04002490
2491out:
Al Viro01194982011-03-16 07:25:36 -04002492 return mntroot;
Trond Myklebust816724e2006-06-24 08:41:41 -04002493
David Howells54ceac42006-08-22 20:06:13 -04002494out_err_nosb:
2495 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04002496 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002497
Eric Parisf9c3a382008-03-05 14:20:18 -05002498error_splat_root:
2499 dput(mntroot);
Al Viro01194982011-03-16 07:25:36 -04002500 mntroot = ERR_PTR(error);
David Howells54ceac42006-08-22 20:06:13 -04002501error_splat_super:
NeilBrowncfbc0682010-03-11 11:20:17 +11002502 if (server && !s->s_root)
2503 bdi_unregister(&server->backing_dev_info);
2504error_splat_bdi:
Al Viro6f5bbff2009-05-06 01:34:22 -04002505 deactivate_locked_super(s);
Chuck Lever06559602007-07-01 12:12:35 -04002506 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002507}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002508EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
David Howellsf7b422b2006-06-09 09:34:33 -04002509
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002510struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002511 int flags, const char *dev_name, void *raw_data)
2512{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002513 struct nfs_mount_info mount_info = {
2514 .fill_super = nfs_fill_super,
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002515 .set_security = nfs_set_sb_security,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002516 };
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002517 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002518 struct nfs_subversion *nfs_mod;
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002519 int error;
2520
Bryan Schumaker46058d42012-05-10 15:07:42 -04002521 mount_info.parsed = nfs_alloc_parsed_mount_data();
Bryan Schumaker87c70832012-05-10 15:07:43 -04002522 mount_info.mntfh = nfs_alloc_fhandle();
2523 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002524 goto out;
2525
2526 /* Validate the mount data */
Bryan Schumaker87c70832012-05-10 15:07:43 -04002527 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002528 if (error == NFS_TEXT_DATA)
Bryan Schumaker46058d42012-05-10 15:07:42 -04002529 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002530 if (error < 0) {
2531 mntroot = ERR_PTR(error);
2532 goto out;
2533 }
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002534
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002535 nfs_mod = get_nfs_version(mount_info.parsed->version);
2536 if (IS_ERR(nfs_mod)) {
2537 mntroot = ERR_CAST(nfs_mod);
2538 goto out;
2539 }
2540
Bryan Schumakerff9099f22012-07-30 16:05:18 -04002541 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002542
2543 put_nfs_version(nfs_mod);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002544out:
Bryan Schumaker46058d42012-05-10 15:07:42 -04002545 nfs_free_parsed_mount_data(mount_info.parsed);
Bryan Schumaker87c70832012-05-10 15:07:43 -04002546 nfs_free_fhandle(mount_info.mntfh);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002547 return mntroot;
2548}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002549EXPORT_SYMBOL_GPL(nfs_fs_mount);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002550
David Howells54ceac42006-08-22 20:06:13 -04002551/*
Trond Myklebust387c1492010-02-03 08:27:35 -05002552 * Ensure that we unregister the bdi before kill_anon_super
2553 * releases the device name
2554 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002555void nfs_put_super(struct super_block *s)
Trond Myklebust387c1492010-02-03 08:27:35 -05002556{
2557 struct nfs_server *server = NFS_SB(s);
2558
2559 bdi_unregister(&server->backing_dev_info);
2560}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002561EXPORT_SYMBOL_GPL(nfs_put_super);
Trond Myklebust387c1492010-02-03 08:27:35 -05002562
2563/*
David Howells54ceac42006-08-22 20:06:13 -04002564 * Destroy an NFS2/3 superblock
2565 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002566void nfs_kill_super(struct super_block *s)
David Howellsf7b422b2006-06-09 09:34:33 -04002567{
2568 struct nfs_server *server = NFS_SB(s);
2569
2570 kill_anon_super(s);
David Howells08734042009-04-03 16:42:42 +01002571 nfs_fscache_release_super_cookie(s);
David Howells54ceac42006-08-22 20:06:13 -04002572 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002573}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002574EXPORT_SYMBOL_GPL(nfs_kill_super);
David Howellsf7b422b2006-06-09 09:34:33 -04002575
David Howells54ceac42006-08-22 20:06:13 -04002576/*
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002577 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
David Howells54ceac42006-08-22 20:06:13 -04002578 */
Stanislav Kinsbursky3dd4f8ef2012-10-02 14:19:04 +04002579static struct dentry *
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002580nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2581 const char *dev_name, void *raw_data)
David Howellsf7b422b2006-06-09 09:34:33 -04002582{
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002583 struct nfs_clone_mount *data = raw_data;
2584 struct nfs_mount_info mount_info = {
2585 .fill_super = nfs_clone_super,
2586 .set_security = nfs_clone_sb_security,
2587 .cloned = data,
2588 };
David Howells54ceac42006-08-22 20:06:13 -04002589 struct nfs_server *server;
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002590 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002591 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
David Howells54ceac42006-08-22 20:06:13 -04002592 int error;
2593
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002594 dprintk("--> nfs_xdev_mount_common()\n");
David Howells54ceac42006-08-22 20:06:13 -04002595
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002596 mount_info.mntfh = mount_info.cloned->fh;
Bryan Schumaker87c70832012-05-10 15:07:43 -04002597
David Howells54ceac42006-08-22 20:06:13 -04002598 /* create a new volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04002599 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
David Howells54ceac42006-08-22 20:06:13 -04002600 if (IS_ERR(server)) {
2601 error = PTR_ERR(server);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002602 goto out_err;
David Howells54ceac42006-08-22 20:06:13 -04002603 }
2604
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002605 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002606 dprintk("<-- nfs_xdev_mount_common() = 0\n");
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002607out:
Al Viro31f43472010-10-29 03:38:12 -04002608 return mntroot;
David Howells54ceac42006-08-22 20:06:13 -04002609
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002610out_err:
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002611 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002612 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002613}
2614
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002615#if IS_ENABLED(CONFIG_NFS_V4)
David Howells54ceac42006-08-22 20:06:13 -04002616
Trond Myklebust01c3f052009-06-17 13:22:58 -07002617static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2618{
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04002619 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2620 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
Trond Myklebust01c3f052009-06-17 13:22:58 -07002621}
2622
David Howells54ceac42006-08-22 20:06:13 -04002623/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04002624 * Validate NFSv4 mount options
2625 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002626static int nfs4_validate_mount_data(void *options,
2627 struct nfs_parsed_mount_data *args,
2628 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04002629{
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002630 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002631 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002632 char *c;
2633
2634 if (data == NULL)
2635 goto out_no_data;
2636
Bryan Schumakercdf66442012-06-05 14:59:54 -04002637 args->version = 4;
2638
Chuck Leverf0768eb2007-07-01 12:13:01 -04002639 switch (data->version) {
2640 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05002641 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002642 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05002643 if (data->host_addrlen == 0)
2644 goto out_no_address;
2645 args->nfs_server.addrlen = data->host_addrlen;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002646 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002647 return -EFAULT;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002648 if (!nfs_verify_server_address(sap))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002649 goto out_no_address;
Trond Myklebust872ece82012-09-04 11:05:07 -04002650 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002651
Chuck Lever6738b252008-06-24 16:33:54 -04002652 if (data->auth_flavourlen) {
2653 if (data->auth_flavourlen > 1)
2654 goto out_inval_auth;
Trond Myklebust20c71f52007-09-20 20:23:51 -04002655 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002656 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04002657 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002658 return -EFAULT;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002659 }
2660
2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002664 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002665
2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002669 args->nfs_server.export_path = c;
2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002671
2672 c = strndup_user(data->client_addr.data, 16);
2673 if (IS_ERR(c))
2674 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002675 args->client_address = c;
2676
2677 /*
2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2679 * can deal with.
2680 */
2681
2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2683 args->rsize = data->rsize;
2684 args->wsize = data->wsize;
2685 args->timeo = data->timeo;
2686 args->retrans = data->retrans;
2687 args->acregmin = data->acregmin;
2688 args->acregmax = data->acregmax;
2689 args->acdirmin = data->acdirmin;
2690 args->acdirmax = data->acdirmax;
2691 args->nfs_server.protocol = data->proto;
Trond Myklebust259875e2008-07-02 14:43:47 -04002692 nfs_validate_transport_protocol(args);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002693
2694 break;
Chuck Lever7630c852009-09-08 19:49:57 -04002695 default:
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002696 return NFS_TEXT_DATA;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002697 }
2698
2699 return 0;
2700
2701out_no_data:
2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2703 return -EINVAL;
2704
2705out_inval_auth:
2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2707 data->auth_flavourlen);
2708 return -EINVAL;
2709
2710out_no_address:
2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2712 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002713}
2714
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002715/*
2716 * NFS v4 module parameters need to stay in the
2717 * NFS client for backwards compatibility
2718 */
2719unsigned int nfs_callback_set_tcpport;
2720unsigned short nfs_callback_tcpport;
2721/* Default cache timeout is 10 minutes */
2722unsigned int nfs_idmap_cache_timeout = 600;
2723/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2724bool nfs4_disable_idmapping = true;
2725unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2726unsigned short send_implementation_id = 1;
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002727char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002728
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002729EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2730EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2731EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2732EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2733EXPORT_SYMBOL_GPL(max_session_slots);
2734EXPORT_SYMBOL_GPL(send_implementation_id);
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002735EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002736
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002737#define NFS_CALLBACK_MAXPORTNR (65535U)
2738
2739static int param_set_portnr(const char *val, const struct kernel_param *kp)
2740{
2741 unsigned long num;
2742 int ret;
2743
2744 if (!val)
2745 return -EINVAL;
Daniel Walter7297cb62012-09-26 21:51:46 +02002746 ret = kstrtoul(val, 0, &num);
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002747 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2748 return -EINVAL;
2749 *((unsigned int *)kp->arg) = num;
2750 return 0;
2751}
2752static struct kernel_param_ops param_ops_portnr = {
2753 .set = param_set_portnr,
2754 .get = param_get_uint,
2755};
2756#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2757
2758module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2759module_param(nfs_idmap_cache_timeout, int, 0644);
2760module_param(nfs4_disable_idmapping, bool, 0644);
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002761module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2762 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002763MODULE_PARM_DESC(nfs4_disable_idmapping,
2764 "Turn off NFSv4 idmapping when using 'sec=sys'");
2765module_param(max_session_slots, ushort, 0644);
2766MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2767 "requests the client will negotiate");
2768module_param(send_implementation_id, ushort, 0644);
2769MODULE_PARM_DESC(send_implementation_id,
2770 "Send implementation ID with NFSv4.1 exchange_id");
Chuck Lever6f2ea7f2012-09-14 17:24:41 -04002771MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
bjschuma@gmail.com425e7762012-08-08 13:57:10 -04002772MODULE_ALIAS("nfs4");
2773
David Howells54ceac42006-08-22 20:06:13 -04002774#endif /* CONFIG_NFS_V4 */