blob: 1679a164c8c9ac26518fc6ad51ff86ad18970151 [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>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
45#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>
49#include <net/ipv6.h>
Chuck Leverd8e77482008-06-23 12:37:01 -040050#include <linux/netdevice.h>
David Howellsf7b422b2006-06-09 09:34:33 -040051#include <linux/nfs_xdr.h>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080052#include <linux/magic.h>
Chuck Leverbf0fd762007-07-01 12:13:44 -040053#include <linux/parser.h>
David Howellsf7b422b2006-06-09 09:34:33 -040054
55#include <asm/system.h>
56#include <asm/uaccess.h>
57
58#include "nfs4_fs.h"
59#include "callback.h"
60#include "delegation.h"
61#include "iostat.h"
62#include "internal.h"
David Howells08734042009-04-03 16:42:42 +010063#include "fscache.h"
David Howellsf7b422b2006-06-09 09:34:33 -040064
65#define NFSDBG_FACILITY NFSDBG_VFS
66
Chuck Leverbf0fd762007-07-01 12:13:44 -040067enum {
68 /* Mount options that take no arguments */
69 Opt_soft, Opt_hard,
Chuck Leverbf0fd762007-07-01 12:13:44 -040070 Opt_posix, Opt_noposix,
71 Opt_cto, Opt_nocto,
72 Opt_ac, Opt_noac,
73 Opt_lock, Opt_nolock,
74 Opt_v2, Opt_v3,
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040075 Opt_udp, Opt_tcp, Opt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -040076 Opt_acl, Opt_noacl,
77 Opt_rdirplus, Opt_nordirplus,
Trond Myklebust75180df2007-05-16 16:53:28 -040078 Opt_sharecache, Opt_nosharecache,
Chuck Leverd7403512008-12-23 15:21:37 -050079 Opt_resvport, Opt_noresvport,
David Howellsb797cac2009-04-03 16:42:48 +010080 Opt_fscache, Opt_nofscache,
Chuck Leverbf0fd762007-07-01 12:13:44 -040081
82 /* Mount options that take integer arguments */
83 Opt_port,
84 Opt_rsize, Opt_wsize, Opt_bsize,
85 Opt_timeo, Opt_retrans,
86 Opt_acregmin, Opt_acregmax,
87 Opt_acdirmin, Opt_acdirmax,
88 Opt_actimeo,
89 Opt_namelen,
90 Opt_mountport,
Chuck Levere887cbc2007-10-26 13:32:29 -040091 Opt_mountvers,
Chuck Leverad879ce2007-10-26 13:32:24 -040092 Opt_nfsvers,
Chuck Leverbf0fd762007-07-01 12:13:44 -040093
94 /* Mount options that take string arguments */
Chuck Lever33832032007-12-10 14:59:13 -050095 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
Chuck Lever0ac83772007-09-11 18:01:04 -040096 Opt_addr, Opt_mountaddr, Opt_clientaddr,
Trond Myklebust7973c1f2008-07-15 17:58:14 -040097 Opt_lookupcache,
David Howellsb797cac2009-04-03 16:42:48 +010098 Opt_fscache_uniq,
Chuck Leverbf0fd762007-07-01 12:13:44 -040099
Chuck Leverf45663c2008-06-24 19:28:02 -0400100 /* Special mount options */
101 Opt_userspace, Opt_deprecated, Opt_sloppy,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400102
103 Opt_err
104};
105
Steven Whitehousea447c092008-10-13 10:46:57 +0100106static const match_table_t nfs_mount_option_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400107 { Opt_userspace, "bg" },
108 { Opt_userspace, "fg" },
Chuck Leverecbb3842008-06-12 12:37:33 -0400109 { Opt_userspace, "retry=%s" },
110
Chuck Leverf45663c2008-06-24 19:28:02 -0400111 { Opt_sloppy, "sloppy" },
112
Chuck Leverbf0fd762007-07-01 12:13:44 -0400113 { Opt_soft, "soft" },
114 { Opt_hard, "hard" },
Chuck Leverd33e4df2008-06-12 12:37:41 -0400115 { Opt_deprecated, "intr" },
116 { Opt_deprecated, "nointr" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400117 { Opt_posix, "posix" },
118 { Opt_noposix, "noposix" },
119 { Opt_cto, "cto" },
120 { Opt_nocto, "nocto" },
121 { Opt_ac, "ac" },
122 { Opt_noac, "noac" },
123 { Opt_lock, "lock" },
124 { Opt_nolock, "nolock" },
125 { Opt_v2, "v2" },
126 { Opt_v3, "v3" },
127 { Opt_udp, "udp" },
128 { Opt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400129 { Opt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400130 { Opt_acl, "acl" },
131 { Opt_noacl, "noacl" },
132 { Opt_rdirplus, "rdirplus" },
133 { Opt_nordirplus, "nordirplus" },
Trond Myklebust75180df2007-05-16 16:53:28 -0400134 { Opt_sharecache, "sharecache" },
135 { Opt_nosharecache, "nosharecache" },
Chuck Leverd7403512008-12-23 15:21:37 -0500136 { Opt_resvport, "resvport" },
137 { Opt_noresvport, "noresvport" },
David Howellsb797cac2009-04-03 16:42:48 +0100138 { Opt_fscache, "fsc" },
139 { Opt_fscache_uniq, "fsc=%s" },
140 { Opt_nofscache, "nofsc" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400141
142 { Opt_port, "port=%u" },
143 { Opt_rsize, "rsize=%u" },
144 { Opt_wsize, "wsize=%u" },
145 { Opt_bsize, "bsize=%u" },
146 { Opt_timeo, "timeo=%u" },
147 { Opt_retrans, "retrans=%u" },
148 { Opt_acregmin, "acregmin=%u" },
149 { Opt_acregmax, "acregmax=%u" },
150 { Opt_acdirmin, "acdirmin=%u" },
151 { Opt_acdirmax, "acdirmax=%u" },
152 { Opt_actimeo, "actimeo=%u" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400153 { Opt_namelen, "namlen=%u" },
154 { Opt_mountport, "mountport=%u" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400155 { Opt_mountvers, "mountvers=%u" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400156 { Opt_nfsvers, "nfsvers=%u" },
157 { Opt_nfsvers, "vers=%u" },
158
159 { Opt_sec, "sec=%s" },
160 { Opt_proto, "proto=%s" },
161 { Opt_mountproto, "mountproto=%s" },
162 { Opt_addr, "addr=%s" },
163 { Opt_clientaddr, "clientaddr=%s" },
Chuck Lever33832032007-12-10 14:59:13 -0500164 { Opt_mounthost, "mounthost=%s" },
Chuck Lever0ac83772007-09-11 18:01:04 -0400165 { Opt_mountaddr, "mountaddr=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400166
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400167 { Opt_lookupcache, "lookupcache=%s" },
168
Chuck Leverbf0fd762007-07-01 12:13:44 -0400169 { Opt_err, NULL }
170};
171
172enum {
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400173 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400174
175 Opt_xprt_err
176};
177
Steven Whitehousea447c092008-10-13 10:46:57 +0100178static const match_table_t nfs_xprt_protocol_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400179 { Opt_xprt_udp, "udp" },
180 { Opt_xprt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400181 { Opt_xprt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400182
183 { Opt_xprt_err, NULL }
184};
185
186enum {
187 Opt_sec_none, Opt_sec_sys,
188 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
189 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
190 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
191
192 Opt_sec_err
193};
194
Steven Whitehousea447c092008-10-13 10:46:57 +0100195static const match_table_t nfs_secflavor_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400196 { Opt_sec_none, "none" },
197 { Opt_sec_none, "null" },
198 { Opt_sec_sys, "sys" },
199
200 { Opt_sec_krb5, "krb5" },
201 { Opt_sec_krb5i, "krb5i" },
202 { Opt_sec_krb5p, "krb5p" },
203
204 { Opt_sec_lkey, "lkey" },
205 { Opt_sec_lkeyi, "lkeyi" },
206 { Opt_sec_lkeyp, "lkeyp" },
207
Olga Kornievskaia8d042212008-02-13 16:47:06 -0500208 { Opt_sec_spkm, "spkm3" },
209 { Opt_sec_spkmi, "spkm3i" },
210 { Opt_sec_spkmp, "spkm3p" },
211
Chuck Leverbf0fd762007-07-01 12:13:44 -0400212 { Opt_sec_err, NULL }
213};
214
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400215enum {
216 Opt_lookupcache_all, Opt_lookupcache_positive,
217 Opt_lookupcache_none,
218
219 Opt_lookupcache_err
220};
221
222static match_table_t nfs_lookupcache_tokens = {
223 { Opt_lookupcache_all, "all" },
224 { Opt_lookupcache_positive, "pos" },
225 { Opt_lookupcache_positive, "positive" },
226 { Opt_lookupcache_none, "none" },
227
228 { Opt_lookupcache_err, NULL }
229};
230
Chuck Leverbf0fd762007-07-01 12:13:44 -0400231
Al Viro42faad92008-04-24 07:21:56 -0400232static void nfs_umount_begin(struct super_block *);
Trond Myklebust816724e2006-06-24 08:41:41 -0400233static int nfs_statfs(struct dentry *, struct kstatfs *);
David Howellsf7b422b2006-06-09 09:34:33 -0400234static int nfs_show_options(struct seq_file *, struct vfsmount *);
235static int nfs_show_stats(struct seq_file *, struct vfsmount *);
Trond Myklebust816724e2006-06-24 08:41:41 -0400236static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
David Howells54ceac42006-08-22 20:06:13 -0400237static int nfs_xdev_get_sb(struct file_system_type *fs_type,
Trond Myklebust816724e2006-06-24 08:41:41 -0400238 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -0400239static void nfs_kill_super(struct super_block *);
Jeff Layton48b605f2008-06-10 15:38:39 -0400240static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
David Howellsf7b422b2006-06-09 09:34:33 -0400241
242static struct file_system_type nfs_fs_type = {
243 .owner = THIS_MODULE,
244 .name = "nfs",
245 .get_sb = nfs_get_sb,
246 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400248};
249
David Howells54ceac42006-08-22 20:06:13 -0400250struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400251 .owner = THIS_MODULE,
252 .name = "nfs",
David Howells54ceac42006-08-22 20:06:13 -0400253 .get_sb = nfs_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400254 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400256};
257
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800258static const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400259 .alloc_inode = nfs_alloc_inode,
260 .destroy_inode = nfs_destroy_inode,
261 .write_inode = nfs_write_inode,
262 .statfs = nfs_statfs,
263 .clear_inode = nfs_clear_inode,
264 .umount_begin = nfs_umount_begin,
265 .show_options = nfs_show_options,
266 .show_stats = nfs_show_stats,
Jeff Layton48b605f2008-06-10 15:38:39 -0400267 .remount_fs = nfs_remount,
David Howellsf7b422b2006-06-09 09:34:33 -0400268};
269
270#ifdef CONFIG_NFS_V4
Trond Myklebust816724e2006-06-24 08:41:41 -0400271static int nfs4_get_sb(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howells54ceac42006-08-22 20:06:13 -0400273static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
275static int nfs4_referral_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -0400277static void nfs4_kill_super(struct super_block *sb);
278
279static struct file_system_type nfs4_fs_type = {
280 .owner = THIS_MODULE,
281 .name = "nfs4",
282 .get_sb = nfs4_get_sb,
283 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700284 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400285};
286
David Howells54ceac42006-08-22 20:06:13 -0400287struct file_system_type nfs4_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400288 .owner = THIS_MODULE,
289 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400290 .get_sb = nfs4_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400291 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400293};
294
David Howells54ceac42006-08-22 20:06:13 -0400295struct file_system_type nfs4_referral_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400296 .owner = THIS_MODULE,
297 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400298 .get_sb = nfs4_referral_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400299 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400301};
302
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800303static const struct super_operations nfs4_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400304 .alloc_inode = nfs_alloc_inode,
305 .destroy_inode = nfs_destroy_inode,
306 .write_inode = nfs_write_inode,
307 .statfs = nfs_statfs,
308 .clear_inode = nfs4_clear_inode,
309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
311 .show_stats = nfs_show_stats,
Jeff Layton48b605f2008-06-10 15:38:39 -0400312 .remount_fs = nfs_remount,
David Howellsf7b422b2006-06-09 09:34:33 -0400313};
314#endif
315
Rusty Russell8e1f9362007-07-17 04:03:17 -0700316static struct shrinker acl_shrinker = {
317 .shrink = nfs_access_cache_shrinker,
318 .seeks = DEFAULT_SEEKS,
319};
Trond Myklebust979df722006-07-25 11:28:19 -0400320
David Howellsf7b422b2006-06-09 09:34:33 -0400321/*
322 * Register the NFS filesystems
323 */
324int __init register_nfs_fs(void)
325{
326 int ret;
327
328 ret = register_filesystem(&nfs_fs_type);
329 if (ret < 0)
330 goto error_0;
331
David Howellsf7b422b2006-06-09 09:34:33 -0400332 ret = nfs_register_sysctl();
333 if (ret < 0)
334 goto error_1;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800335#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400336 ret = register_filesystem(&nfs4_fs_type);
337 if (ret < 0)
338 goto error_2;
339#endif
Rusty Russell8e1f9362007-07-17 04:03:17 -0700340 register_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400341 return 0;
342
343#ifdef CONFIG_NFS_V4
344error_2:
345 nfs_unregister_sysctl();
Peter Zijlstra89a09142007-03-16 13:38:26 -0800346#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400347error_1:
348 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400349error_0:
350 return ret;
351}
352
353/*
354 * Unregister the NFS filesystems
355 */
356void __exit unregister_nfs_fs(void)
357{
Rusty Russell8e1f9362007-07-17 04:03:17 -0700358 unregister_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400359#ifdef CONFIG_NFS_V4
360 unregister_filesystem(&nfs4_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400361#endif
Alexey Dobriyan49af7ee2007-09-18 22:46:40 -0700362 nfs_unregister_sysctl();
David Howellsf7b422b2006-06-09 09:34:33 -0400363 unregister_filesystem(&nfs_fs_type);
364}
365
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400366void nfs_sb_active(struct super_block *sb)
Steve Dicksonef818a22007-11-08 04:05:04 -0500367{
368 struct nfs_server *server = NFS_SB(sb);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400369
370 if (atomic_inc_return(&server->active) == 1)
371 atomic_inc(&sb->s_active);
372}
373
374void nfs_sb_deactive(struct super_block *sb)
375{
376 struct nfs_server *server = NFS_SB(sb);
377
378 if (atomic_dec_and_test(&server->active))
379 deactivate_super(sb);
Steve Dicksonef818a22007-11-08 04:05:04 -0500380}
381
David Howellsf7b422b2006-06-09 09:34:33 -0400382/*
383 * Deliver file system statistics to userspace
384 */
Trond Myklebust816724e2006-06-24 08:41:41 -0400385static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400386{
David Howells0c7d90c2006-08-22 20:06:10 -0400387 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400388 unsigned char blockbits;
389 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400390 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
David Howellsf7b422b2006-06-09 09:34:33 -0400391 struct nfs_fattr fattr;
392 struct nfs_fsstat res = {
393 .fattr = &fattr,
394 };
395 int error;
396
David Howells8fa5c002006-08-22 20:06:12 -0400397 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
David Howellsf7b422b2006-06-09 09:34:33 -0400398 if (error < 0)
399 goto out_err;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700400 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400401
402 /*
403 * Current versions of glibc do not correctly handle the
404 * case where f_frsize != f_bsize. Eventually we want to
405 * report the value of wtmult in this field.
406 */
David Howells0c7d90c2006-08-22 20:06:10 -0400407 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400408
409 /*
410 * On most *nix systems, f_blocks, f_bfree, and f_bavail
411 * are reported in units of f_frsize. Linux hasn't had
412 * an f_frsize field in its statfs struct until recently,
413 * thus historically Linux's sys_statfs reports these
414 * fields in units of f_bsize.
415 */
David Howells0c7d90c2006-08-22 20:06:10 -0400416 buf->f_bsize = dentry->d_sb->s_blocksize;
417 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400418 blockres = (1 << blockbits) - 1;
419 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
420 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
421 buf->f_bavail = (res.abytes + blockres) >> blockbits;
422
423 buf->f_files = res.tfiles;
424 buf->f_ffree = res.afiles;
425
426 buf->f_namelen = server->namelen;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700427
David Howellsf7b422b2006-06-09 09:34:33 -0400428 return 0;
429
430 out_err:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700431 dprintk("%s: statfs error = %d\n", __func__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700432 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400433}
434
David Howells7d4e2742006-08-22 20:06:07 -0400435/*
436 * Map the security flavour number to a name
437 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400438static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
439{
David Howells7d4e2742006-08-22 20:06:07 -0400440 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400441 rpc_authflavor_t flavour;
442 const char *str;
443 } sec_flavours[] = {
444 { RPC_AUTH_NULL, "null" },
445 { RPC_AUTH_UNIX, "sys" },
446 { RPC_AUTH_GSS_KRB5, "krb5" },
447 { RPC_AUTH_GSS_KRB5I, "krb5i" },
448 { RPC_AUTH_GSS_KRB5P, "krb5p" },
449 { RPC_AUTH_GSS_LKEY, "lkey" },
450 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
451 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
452 { RPC_AUTH_GSS_SPKM, "spkm" },
453 { RPC_AUTH_GSS_SPKMI, "spkmi" },
454 { RPC_AUTH_GSS_SPKMP, "spkmp" },
Chuck Lever4d81cd12007-07-01 12:12:40 -0400455 { UINT_MAX, "unknown" }
Trond Myklebust81039f12006-06-09 09:34:34 -0400456 };
457 int i;
458
Chuck Lever4d81cd12007-07-01 12:12:40 -0400459 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
Trond Myklebust81039f12006-06-09 09:34:34 -0400460 if (sec_flavours[i].flavour == flavour)
461 break;
462 }
463 return sec_flavours[i].str;
464}
465
Chuck Lever82d101d2008-03-14 14:10:37 -0400466static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
467 int showdefaults)
468{
469 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
470
471 switch (sap->sa_family) {
472 case AF_INET: {
473 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
Harvey Harrisonbe859402008-10-31 00:56:28 -0700474 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400475 break;
476 }
477 case AF_INET6: {
478 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700479 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400480 break;
481 }
482 default:
483 if (showdefaults)
484 seq_printf(m, ",mountaddr=unspecified");
485 }
486
487 if (nfss->mountd_version || showdefaults)
488 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
489 if (nfss->mountd_port || showdefaults)
490 seq_printf(m, ",mountport=%u", nfss->mountd_port);
491
492 switch (nfss->mountd_protocol) {
493 case IPPROTO_UDP:
494 seq_printf(m, ",mountproto=udp");
495 break;
496 case IPPROTO_TCP:
497 seq_printf(m, ",mountproto=tcp");
498 break;
499 default:
500 if (showdefaults)
501 seq_printf(m, ",mountproto=auto");
502 }
503}
504
David Howellsf7b422b2006-06-09 09:34:33 -0400505/*
506 * Describe the mount options in force on this server representation
507 */
Chuck Lever82d101d2008-03-14 14:10:37 -0400508static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
509 int showdefaults)
David Howellsf7b422b2006-06-09 09:34:33 -0400510{
David Howells509de812006-08-22 20:06:11 -0400511 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400512 int flag;
David Howells509de812006-08-22 20:06:11 -0400513 const char *str;
514 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400515 } nfs_info[] = {
516 { NFS_MOUNT_SOFT, ",soft", ",hard" },
Chuck Lever82d101d2008-03-14 14:10:37 -0400517 { NFS_MOUNT_INTR, ",intr", ",nointr" },
518 { NFS_MOUNT_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400519 { NFS_MOUNT_NOCTO, ",nocto", "" },
520 { NFS_MOUNT_NOAC, ",noac", "" },
521 { NFS_MOUNT_NONLM, ",nolock", "" },
522 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400523 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Chuck Leverd7403512008-12-23 15:21:37 -0500524 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
525 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400526 { 0, NULL, NULL }
527 };
David Howells509de812006-08-22 20:06:11 -0400528 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400529 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400530 u32 version = clp->rpc_ops->version;
David Howellsf7b422b2006-06-09 09:34:33 -0400531
Chuck Lever82d101d2008-03-14 14:10:37 -0400532 seq_printf(m, ",vers=%u", version);
Chuck Lever2d767432008-03-14 14:10:08 -0400533 seq_printf(m, ",rsize=%u", nfss->rsize);
534 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400535 if (nfss->bsize != 0)
536 seq_printf(m, ",bsize=%u", nfss->bsize);
537 seq_printf(m, ",namlen=%u", nfss->namelen);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400538 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400539 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400540 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400541 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400542 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400543 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400544 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400545 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400546 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
547 if (nfss->flags & nfs_infop->flag)
548 seq_puts(m, nfs_infop->str);
549 else
550 seq_puts(m, nfs_infop->nostr);
551 }
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400552 seq_printf(m, ",proto=%s",
553 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
Chuck Lever82d101d2008-03-14 14:10:37 -0400554 if (version == 4) {
555 if (nfss->port != NFS_PORT)
556 seq_printf(m, ",port=%u", nfss->port);
557 } else
558 if (nfss->port)
559 seq_printf(m, ",port=%u", nfss->port);
560
Trond Myklebust33170232007-12-20 16:03:59 -0500561 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
562 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400563 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400564
565 if (version != 4)
566 nfs_show_mountd_options(m, nfss, showdefaults);
567
568#ifdef CONFIG_NFS_V4
569 if (clp->rpc_ops->version == 4)
570 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
571#endif
David Howellsb797cac2009-04-03 16:42:48 +0100572 if (nfss->options & NFS_OPTION_FSCACHE)
573 seq_printf(m, ",fsc");
David Howellsf7b422b2006-06-09 09:34:33 -0400574}
575
576/*
577 * Describe the mount options on this VFS mountpoint
578 */
579static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
580{
581 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
582
583 nfs_show_mount_options(m, nfss, 0);
584
Chuck Lever5d8515c2007-12-10 14:57:16 -0500585 seq_printf(m, ",addr=%s",
586 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
587 RPC_DISPLAY_ADDR));
David Howellsf7b422b2006-06-09 09:34:33 -0400588
589 return 0;
590}
591
592/*
593 * Present statistical information for this VFS mountpoint
594 */
595static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
596{
597 int i, cpu;
598 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
599 struct rpc_auth *auth = nfss->client->cl_auth;
600 struct nfs_iostats totals = { };
601
602 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
603
604 /*
605 * Display all mount option settings
606 */
607 seq_printf(m, "\n\topts:\t");
608 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
612 nfs_show_mount_options(m, nfss, 1);
613
614 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
615
616 seq_printf(m, "\n\tcaps:\t");
617 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400618 seq_printf(m, ",wtmult=%u", nfss->wtmult);
619 seq_printf(m, ",dtsize=%u", nfss->dtsize);
620 seq_printf(m, ",bsize=%u", nfss->bsize);
621 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400622
623#ifdef CONFIG_NFS_V4
Trond Myklebust40c553192007-12-14 14:56:07 -0500624 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400625 seq_printf(m, "\n\tnfsv4:\t");
626 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
627 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
628 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
629 }
630#endif
631
632 /*
633 * Display security flavor in effect for this mount
634 */
Chuck Lever2d767432008-03-14 14:10:08 -0400635 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400636 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400637 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400638
639 /*
640 * Display superblock I/O counters
641 */
642 for_each_possible_cpu(cpu) {
643 struct nfs_iostats *stats;
644
645 preempt_disable();
646 stats = per_cpu_ptr(nfss->io_stats, cpu);
647
648 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
649 totals.events[i] += stats->events[i];
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 totals.bytes[i] += stats->bytes[i];
David Howells6a510912009-04-03 16:42:43 +0100652#ifdef CONFIG_NFS_FSCACHE
653 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
654 totals.fscache[i] += stats->fscache[i];
655#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400656
657 preempt_enable();
658 }
659
660 seq_printf(m, "\n\tevents:\t");
661 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
662 seq_printf(m, "%lu ", totals.events[i]);
663 seq_printf(m, "\n\tbytes:\t");
664 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
665 seq_printf(m, "%Lu ", totals.bytes[i]);
David Howells6a510912009-04-03 16:42:43 +0100666#ifdef CONFIG_NFS_FSCACHE
667 if (nfss->options & NFS_OPTION_FSCACHE) {
668 seq_printf(m, "\n\tfsc:\t");
669 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
670 seq_printf(m, "%Lu ", totals.bytes[i]);
671 }
672#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400673 seq_printf(m, "\n");
674
675 rpc_print_iostats(m, nfss->client);
676
677 return 0;
678}
679
680/*
681 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400682 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400683 */
Al Viro42faad92008-04-24 07:21:56 -0400684static void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400685{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200686 struct nfs_server *server;
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400687 struct rpc_clnt *rpc;
688
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200689 lock_kernel();
690
691 server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400692 /* -EIO all pending I/O */
693 rpc = server->client_acl;
694 if (!IS_ERR(rpc))
695 rpc_killall_tasks(rpc);
696 rpc = server->client;
697 if (!IS_ERR(rpc))
698 rpc_killall_tasks(rpc);
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200699
700 unlock_kernel();
David Howellsf7b422b2006-06-09 09:34:33 -0400701}
702
703/*
Chuck Levercdcd7f92007-12-10 14:57:45 -0500704 * Sanity-check a server address provided by the mount command.
705 *
706 * Address family must be initialized, and address must not be
707 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400708 */
709static int nfs_verify_server_address(struct sockaddr *addr)
710{
711 switch (addr->sa_family) {
712 case AF_INET: {
Chuck Levercdcd7f92007-12-10 14:57:45 -0500713 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700714 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f92007-12-10 14:57:45 -0500715 }
716 case AF_INET6: {
717 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
718 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -0400719 }
720 }
721
722 return 0;
723}
724
Chuck Leverce3b7e12008-06-23 12:36:53 -0400725static void nfs_parse_ipv4_address(char *string, size_t str_len,
726 struct sockaddr *sap, size_t *addr_len)
Chuck Lever9412b922007-12-10 14:59:21 -0500727{
Chuck Leverce3b7e12008-06-23 12:36:53 -0400728 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
729 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
Chuck Lever9412b922007-12-10 14:59:21 -0500730
Chuck Leverce3b7e12008-06-23 12:36:53 -0400731 if (str_len <= INET_ADDRSTRLEN) {
732 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
733 (int)str_len, string);
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500734
Chuck Leverce3b7e12008-06-23 12:36:53 -0400735 sin->sin_family = AF_INET;
736 *addr_len = sizeof(*sin);
737 if (in4_pton(string, str_len, addr, '\0', NULL))
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500738 return;
739 }
Chuck Lever9412b922007-12-10 14:59:21 -0500740
741 sap->sa_family = AF_UNSPEC;
Chuck Leverce3b7e12008-06-23 12:36:53 -0400742 *addr_len = 0;
743}
744
745#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Chuck Lever5e2e7722008-10-08 15:38:10 -0400746static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
747 const char *delim,
748 struct sockaddr_in6 *sin6)
Chuck Leverd8e77482008-06-23 12:37:01 -0400749{
750 char *p;
751 size_t len;
752
Chuck Lever5e2e7722008-10-08 15:38:10 -0400753 if ((string + str_len) == delim)
754 return 1;
755
Chuck Leverd8e77482008-06-23 12:37:01 -0400756 if (*delim != IPV6_SCOPE_DELIMITER)
Chuck Lever5e2e7722008-10-08 15:38:10 -0400757 return 0;
758
759 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
760 return 0;
Chuck Leverd8e77482008-06-23 12:37:01 -0400761
762 len = (string + str_len) - delim - 1;
763 p = kstrndup(delim + 1, len, GFP_KERNEL);
764 if (p) {
765 unsigned long scope_id = 0;
766 struct net_device *dev;
767
768 dev = dev_get_by_name(&init_net, p);
769 if (dev != NULL) {
770 scope_id = dev->ifindex;
771 dev_put(dev);
772 } else {
Chuck Lever5e2e7722008-10-08 15:38:10 -0400773 if (strict_strtoul(p, 10, &scope_id) == 0) {
774 kfree(p);
775 return 0;
776 }
Chuck Leverd8e77482008-06-23 12:37:01 -0400777 }
778
779 kfree(p);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400780
Chuck Leverd8e77482008-06-23 12:37:01 -0400781 sin6->sin6_scope_id = scope_id;
782 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400783 return 1;
Chuck Leverd8e77482008-06-23 12:37:01 -0400784 }
Chuck Lever5e2e7722008-10-08 15:38:10 -0400785
786 return 0;
Chuck Leverd8e77482008-06-23 12:37:01 -0400787}
788
Chuck Leverce3b7e12008-06-23 12:36:53 -0400789static void nfs_parse_ipv6_address(char *string, size_t str_len,
790 struct sockaddr *sap, size_t *addr_len)
791{
792 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
793 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
Chuck Leverd8e77482008-06-23 12:37:01 -0400794 const char *delim;
Chuck Leverce3b7e12008-06-23 12:36:53 -0400795
796 if (str_len <= INET6_ADDRSTRLEN) {
797 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
798 (int)str_len, string);
799
800 sin6->sin6_family = AF_INET6;
801 *addr_len = sizeof(*sin6);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400802 if (in6_pton(string, str_len, addr,
803 IPV6_SCOPE_DELIMITER, &delim) != 0) {
804 if (nfs_parse_ipv6_scope_id(string, str_len,
805 delim, sin6) != 0)
806 return;
Chuck Leverd8e77482008-06-23 12:37:01 -0400807 }
Chuck Leverce3b7e12008-06-23 12:36:53 -0400808 }
809
810 sap->sa_family = AF_UNSPEC;
811 *addr_len = 0;
812}
813#else
814static void nfs_parse_ipv6_address(char *string, size_t str_len,
815 struct sockaddr *sap, size_t *addr_len)
816{
817 sap->sa_family = AF_UNSPEC;
818 *addr_len = 0;
819}
820#endif
821
822/*
823 * Construct a sockaddr based on the contents of a string that contains
824 * an IP address in presentation format.
825 *
826 * If there is a problem constructing the new sockaddr, set the address
827 * family to AF_UNSPEC.
828 */
J. Bruce Fieldsea31a4432008-08-20 16:10:23 -0400829void nfs_parse_ip_address(char *string, size_t str_len,
Chuck Leverce3b7e12008-06-23 12:36:53 -0400830 struct sockaddr *sap, size_t *addr_len)
831{
832 unsigned int i, colons;
833
834 colons = 0;
835 for (i = 0; i < str_len; i++)
836 if (string[i] == ':')
837 colons++;
838
839 if (colons >= 2)
840 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
841 else
842 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
Chuck Lever9412b922007-12-10 14:59:21 -0500843}
844
845/*
Trond Myklebust259875e2008-07-02 14:43:47 -0400846 * Sanity check the NFS transport protocol.
847 *
848 */
849static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
850{
851 switch (mnt->nfs_server.protocol) {
852 case XPRT_TRANSPORT_UDP:
853 case XPRT_TRANSPORT_TCP:
854 case XPRT_TRANSPORT_RDMA:
855 break;
856 default:
857 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
858 }
859}
860
861/*
862 * For text based NFSv2/v3 mounts, the mount protocol transport default
863 * settings should depend upon the specified NFS transport.
864 */
865static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
866{
867 nfs_validate_transport_protocol(mnt);
868
869 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
870 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
871 return;
872 switch (mnt->nfs_server.protocol) {
873 case XPRT_TRANSPORT_UDP:
874 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
875 break;
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
879 }
880}
881
882/*
Chuck Lever01060c82008-06-24 16:33:38 -0400883 * Parse the value of the 'sec=' option.
884 *
Chuck Leverdd07c942008-06-24 16:33:46 -0400885 * The flavor_len setting is for v4 mounts.
Chuck Lever01060c82008-06-24 16:33:38 -0400886 */
887static int nfs_parse_security_flavors(char *value,
888 struct nfs_parsed_mount_data *mnt)
889{
890 substring_t args[MAX_OPT_ARGS];
891
892 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
893
894 switch (match_token(value, nfs_secflavor_tokens, args)) {
895 case Opt_sec_none:
Chuck Lever01060c82008-06-24 16:33:38 -0400896 mnt->auth_flavor_len = 0;
897 mnt->auth_flavors[0] = RPC_AUTH_NULL;
898 break;
899 case Opt_sec_sys:
Chuck Lever01060c82008-06-24 16:33:38 -0400900 mnt->auth_flavor_len = 0;
901 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
902 break;
903 case Opt_sec_krb5:
Chuck Lever01060c82008-06-24 16:33:38 -0400904 mnt->auth_flavor_len = 1;
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
906 break;
907 case Opt_sec_krb5i:
Chuck Lever01060c82008-06-24 16:33:38 -0400908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
910 break;
911 case Opt_sec_krb5p:
Chuck Lever01060c82008-06-24 16:33:38 -0400912 mnt->auth_flavor_len = 1;
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
914 break;
915 case Opt_sec_lkey:
Chuck Lever01060c82008-06-24 16:33:38 -0400916 mnt->auth_flavor_len = 1;
917 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
918 break;
919 case Opt_sec_lkeyi:
Chuck Lever01060c82008-06-24 16:33:38 -0400920 mnt->auth_flavor_len = 1;
921 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
922 break;
923 case Opt_sec_lkeyp:
Chuck Lever01060c82008-06-24 16:33:38 -0400924 mnt->auth_flavor_len = 1;
925 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
926 break;
927 case Opt_sec_spkm:
Chuck Lever01060c82008-06-24 16:33:38 -0400928 mnt->auth_flavor_len = 1;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
930 break;
931 case Opt_sec_spkmi:
Chuck Lever01060c82008-06-24 16:33:38 -0400932 mnt->auth_flavor_len = 1;
933 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
934 break;
935 case Opt_sec_spkmp:
Chuck Lever01060c82008-06-24 16:33:38 -0400936 mnt->auth_flavor_len = 1;
937 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
938 break;
939 default:
940 return 0;
941 }
942
943 return 1;
944}
945
Chuck Leverf45663c2008-06-24 19:28:02 -0400946static void nfs_parse_invalid_value(const char *option)
947{
948 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
949}
950
Chuck Lever01060c82008-06-24 16:33:38 -0400951/*
Chuck Leverbf0fd762007-07-01 12:13:44 -0400952 * Error-check and convert a string of mount options from user space into
Chuck Leverf45663c2008-06-24 19:28:02 -0400953 * a data structure. The whole mount string is processed; bad options are
954 * skipped as they are encountered. If there were no errors, return 1;
955 * otherwise return 0 (zero).
Chuck Leverbf0fd762007-07-01 12:13:44 -0400956 */
957static int nfs_parse_mount_options(char *raw,
958 struct nfs_parsed_mount_data *mnt)
959{
Eric Parisf9c3a382008-03-05 14:20:18 -0500960 char *p, *string, *secdata;
Chuck Leverf45663c2008-06-24 19:28:02 -0400961 int rc, sloppy = 0, errors = 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400962
963 if (!raw) {
964 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
965 return 1;
966 }
967 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
968
Eric Parisf9c3a382008-03-05 14:20:18 -0500969 secdata = alloc_secdata();
970 if (!secdata)
971 goto out_nomem;
972
973 rc = security_sb_copy_data(raw, secdata);
974 if (rc)
975 goto out_security_failure;
976
977 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
978 if (rc)
979 goto out_security_failure;
980
981 free_secdata(secdata);
982
Chuck Leverbf0fd762007-07-01 12:13:44 -0400983 while ((p = strsep(&raw, ",")) != NULL) {
984 substring_t args[MAX_OPT_ARGS];
985 int option, token;
986
987 if (!*p)
988 continue;
989
990 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
991
992 token = match_token(p, nfs_mount_option_tokens, args);
993 switch (token) {
Chuck Leverf45663c2008-06-24 19:28:02 -0400994
995 /*
996 * boolean options: foo/nofoo
997 */
Chuck Leverbf0fd762007-07-01 12:13:44 -0400998 case Opt_soft:
999 mnt->flags |= NFS_MOUNT_SOFT;
1000 break;
1001 case Opt_hard:
1002 mnt->flags &= ~NFS_MOUNT_SOFT;
1003 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001004 case Opt_posix:
1005 mnt->flags |= NFS_MOUNT_POSIX;
1006 break;
1007 case Opt_noposix:
1008 mnt->flags &= ~NFS_MOUNT_POSIX;
1009 break;
1010 case Opt_cto:
1011 mnt->flags &= ~NFS_MOUNT_NOCTO;
1012 break;
1013 case Opt_nocto:
1014 mnt->flags |= NFS_MOUNT_NOCTO;
1015 break;
1016 case Opt_ac:
1017 mnt->flags &= ~NFS_MOUNT_NOAC;
1018 break;
1019 case Opt_noac:
1020 mnt->flags |= NFS_MOUNT_NOAC;
1021 break;
1022 case Opt_lock:
1023 mnt->flags &= ~NFS_MOUNT_NONLM;
1024 break;
1025 case Opt_nolock:
1026 mnt->flags |= NFS_MOUNT_NONLM;
1027 break;
1028 case Opt_v2:
1029 mnt->flags &= ~NFS_MOUNT_VER3;
1030 break;
1031 case Opt_v3:
1032 mnt->flags |= NFS_MOUNT_VER3;
1033 break;
1034 case Opt_udp:
1035 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001036 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001037 break;
1038 case Opt_tcp:
1039 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001040 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001041 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001042 case Opt_rdma:
1043 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1044 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001045 xprt_load_transport(p);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001046 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001047 case Opt_acl:
1048 mnt->flags &= ~NFS_MOUNT_NOACL;
1049 break;
1050 case Opt_noacl:
1051 mnt->flags |= NFS_MOUNT_NOACL;
1052 break;
1053 case Opt_rdirplus:
1054 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1055 break;
1056 case Opt_nordirplus:
1057 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1058 break;
Trond Myklebust75180df2007-05-16 16:53:28 -04001059 case Opt_sharecache:
1060 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1061 break;
1062 case Opt_nosharecache:
1063 mnt->flags |= NFS_MOUNT_UNSHARED;
1064 break;
Chuck Leverd7403512008-12-23 15:21:37 -05001065 case Opt_resvport:
1066 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1067 break;
1068 case Opt_noresvport:
1069 mnt->flags |= NFS_MOUNT_NORESVPORT;
1070 break;
David Howellsb797cac2009-04-03 16:42:48 +01001071 case Opt_fscache:
1072 mnt->options |= NFS_OPTION_FSCACHE;
1073 kfree(mnt->fscache_uniq);
1074 mnt->fscache_uniq = NULL;
1075 break;
1076 case Opt_nofscache:
1077 mnt->options &= ~NFS_OPTION_FSCACHE;
1078 kfree(mnt->fscache_uniq);
1079 mnt->fscache_uniq = NULL;
1080 break;
1081 case Opt_fscache_uniq:
1082 string = match_strdup(args);
1083 if (!string)
1084 goto out_nomem;
1085 kfree(mnt->fscache_uniq);
1086 mnt->fscache_uniq = string;
1087 mnt->options |= NFS_OPTION_FSCACHE;
1088 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001089
Chuck Leverf45663c2008-06-24 19:28:02 -04001090 /*
1091 * options that take numeric values
1092 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001093 case Opt_port:
Chuck Leverf45663c2008-06-24 19:28:02 -04001094 if (match_int(args, &option) ||
1095 option < 0 || option > USHORT_MAX) {
1096 errors++;
1097 nfs_parse_invalid_value("port");
1098 } else
1099 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001100 break;
1101 case Opt_rsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001102 if (match_int(args, &option) || option < 0) {
1103 errors++;
1104 nfs_parse_invalid_value("rsize");
1105 } else
1106 mnt->rsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001107 break;
1108 case Opt_wsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001109 if (match_int(args, &option) || option < 0) {
1110 errors++;
1111 nfs_parse_invalid_value("wsize");
1112 } else
1113 mnt->wsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001114 break;
1115 case Opt_bsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001116 if (match_int(args, &option) || option < 0) {
1117 errors++;
1118 nfs_parse_invalid_value("bsize");
1119 } else
1120 mnt->bsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001121 break;
1122 case Opt_timeo:
Chuck Leverf45663c2008-06-24 19:28:02 -04001123 if (match_int(args, &option) || option <= 0) {
1124 errors++;
1125 nfs_parse_invalid_value("timeo");
1126 } else
1127 mnt->timeo = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001128 break;
1129 case Opt_retrans:
Chuck Leverf45663c2008-06-24 19:28:02 -04001130 if (match_int(args, &option) || option <= 0) {
1131 errors++;
1132 nfs_parse_invalid_value("retrans");
1133 } else
1134 mnt->retrans = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001135 break;
1136 case Opt_acregmin:
Chuck Leverf45663c2008-06-24 19:28:02 -04001137 if (match_int(args, &option) || option < 0) {
1138 errors++;
1139 nfs_parse_invalid_value("acregmin");
1140 } else
1141 mnt->acregmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001142 break;
1143 case Opt_acregmax:
Chuck Leverf45663c2008-06-24 19:28:02 -04001144 if (match_int(args, &option) || option < 0) {
1145 errors++;
1146 nfs_parse_invalid_value("acregmax");
1147 } else
1148 mnt->acregmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001149 break;
1150 case Opt_acdirmin:
Chuck Leverf45663c2008-06-24 19:28:02 -04001151 if (match_int(args, &option) || option < 0) {
1152 errors++;
1153 nfs_parse_invalid_value("acdirmin");
1154 } else
1155 mnt->acdirmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001156 break;
1157 case Opt_acdirmax:
Chuck Leverf45663c2008-06-24 19:28:02 -04001158 if (match_int(args, &option) || option < 0) {
1159 errors++;
1160 nfs_parse_invalid_value("acdirmax");
1161 } else
1162 mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001163 break;
1164 case Opt_actimeo:
Chuck Leverf45663c2008-06-24 19:28:02 -04001165 if (match_int(args, &option) || option < 0) {
1166 errors++;
1167 nfs_parse_invalid_value("actimeo");
1168 } else
1169 mnt->acregmin = mnt->acregmax =
1170 mnt->acdirmin = mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001171 break;
1172 case Opt_namelen:
Chuck Leverf45663c2008-06-24 19:28:02 -04001173 if (match_int(args, &option) || option < 0) {
1174 errors++;
1175 nfs_parse_invalid_value("namlen");
1176 } else
1177 mnt->namlen = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001178 break;
1179 case Opt_mountport:
Chuck Leverf45663c2008-06-24 19:28:02 -04001180 if (match_int(args, &option) ||
1181 option < 0 || option > USHORT_MAX) {
1182 errors++;
1183 nfs_parse_invalid_value("mountport");
1184 } else
1185 mnt->mount_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001186 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001187 case Opt_mountvers:
Chuck Leverf45663c2008-06-24 19:28:02 -04001188 if (match_int(args, &option) ||
1189 option < NFS_MNT_VERSION ||
1190 option > NFS_MNT3_VERSION) {
1191 errors++;
1192 nfs_parse_invalid_value("mountvers");
1193 } else
1194 mnt->mount_server.version = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001195 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001196 case Opt_nfsvers:
Chuck Leverf45663c2008-06-24 19:28:02 -04001197 if (match_int(args, &option)) {
1198 errors++;
1199 nfs_parse_invalid_value("nfsvers");
1200 break;
1201 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001202 switch (option) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001203 case NFS2_VERSION:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001204 mnt->flags &= ~NFS_MOUNT_VER3;
1205 break;
Chuck Leverf45663c2008-06-24 19:28:02 -04001206 case NFS3_VERSION:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001207 mnt->flags |= NFS_MOUNT_VER3;
1208 break;
1209 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001210 errors++;
1211 nfs_parse_invalid_value("nfsvers");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001212 }
1213 break;
1214
Chuck Leverf45663c2008-06-24 19:28:02 -04001215 /*
1216 * options that take text values
1217 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001218 case Opt_sec:
1219 string = match_strdup(args);
1220 if (string == NULL)
1221 goto out_nomem;
Chuck Lever01060c82008-06-24 16:33:38 -04001222 rc = nfs_parse_security_flavors(string, mnt);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001223 kfree(string);
Chuck Leverf45663c2008-06-24 19:28:02 -04001224 if (!rc) {
1225 errors++;
1226 dfprintk(MOUNT, "NFS: unrecognized "
1227 "security flavor\n");
1228 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001229 break;
1230 case Opt_proto:
1231 string = match_strdup(args);
1232 if (string == NULL)
1233 goto out_nomem;
1234 token = match_token(string,
1235 nfs_xprt_protocol_tokens, args);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001236
1237 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001238 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001239 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001240 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001241 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001242 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001243 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001244 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001245 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001246 case Opt_xprt_rdma:
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001250 xprt_load_transport(string);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001251 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001252 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001253 errors++;
1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001256 }
Tom Talpeya67d18f2009-03-11 14:37:56 -04001257 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001258 break;
1259 case Opt_mountproto:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
Trond Myklebustd508afb2009-04-06 16:41:35 -07001265 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001266
1267 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001268 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001269 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001270 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001271 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001272 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001273 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001274 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001275 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001276 errors++;
1277 dfprintk(MOUNT, "NFS: unrecognized "
1278 "transport protocol\n");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001279 }
1280 break;
1281 case Opt_addr:
1282 string = match_strdup(args);
1283 if (string == NULL)
1284 goto out_nomem;
Chuck Leverce3b7e12008-06-23 12:36:53 -04001285 nfs_parse_ip_address(string, strlen(string),
1286 (struct sockaddr *)
1287 &mnt->nfs_server.address,
1288 &mnt->nfs_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001289 kfree(string);
1290 break;
1291 case Opt_clientaddr:
1292 string = match_strdup(args);
1293 if (string == NULL)
1294 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001295 kfree(mnt->client_address);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001296 mnt->client_address = string;
1297 break;
Chuck Lever33832032007-12-10 14:59:13 -05001298 case Opt_mounthost:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001302 kfree(mnt->mount_server.hostname);
Chuck Lever33832032007-12-10 14:59:13 -05001303 mnt->mount_server.hostname = string;
1304 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001305 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001306 string = match_strdup(args);
1307 if (string == NULL)
1308 goto out_nomem;
Chuck Leverce3b7e12008-06-23 12:36:53 -04001309 nfs_parse_ip_address(string, strlen(string),
1310 (struct sockaddr *)
1311 &mnt->mount_server.address,
1312 &mnt->mount_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001313 kfree(string);
1314 break;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001315 case Opt_lookupcache:
1316 string = match_strdup(args);
1317 if (string == NULL)
1318 goto out_nomem;
1319 token = match_token(string,
1320 nfs_lookupcache_tokens, args);
1321 kfree(string);
1322 switch (token) {
1323 case Opt_lookupcache_all:
1324 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1325 break;
1326 case Opt_lookupcache_positive:
1327 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1328 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1329 break;
1330 case Opt_lookupcache_none:
1331 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1332 break;
1333 default:
1334 errors++;
1335 dfprintk(MOUNT, "NFS: invalid "
1336 "lookupcache argument\n");
1337 };
1338 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001339
Chuck Leverf45663c2008-06-24 19:28:02 -04001340 /*
1341 * Special options
1342 */
1343 case Opt_sloppy:
1344 sloppy = 1;
1345 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1346 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001347 case Opt_userspace:
1348 case Opt_deprecated:
Chuck Leverd33e4df2008-06-12 12:37:41 -04001349 dfprintk(MOUNT, "NFS: ignoring mount option "
1350 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001351 break;
1352
1353 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001354 errors++;
1355 dfprintk(MOUNT, "NFS: unrecognized mount option "
1356 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001357 }
1358 }
1359
Chuck Leveraf904de2008-09-08 11:58:13 -04001360 if (errors > 0) {
1361 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1362 errors, (errors == 1 ? "" : "s"));
1363 if (!sloppy)
1364 return 0;
1365 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001366 return 1;
1367
1368out_nomem:
1369 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1370 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001371out_security_failure:
1372 free_secdata(secdata);
1373 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1374 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001375}
1376
1377/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001378 * Use the remote server's MOUNT service to request the NFS file handle
1379 * corresponding to the provided path.
1380 */
1381static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1382 struct nfs_fh *root_fh)
1383{
Chuck Leverc5d120f2008-12-23 15:21:35 -05001384 struct nfs_mount_request request = {
1385 .sap = (struct sockaddr *)
1386 &args->mount_server.address,
1387 .dirpath = args->nfs_server.export_path,
1388 .protocol = args->mount_server.protocol,
1389 .fh = root_fh,
Chuck Lever50a737f2008-12-23 15:21:37 -05001390 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
Chuck Leverc5d120f2008-12-23 15:21:35 -05001391 };
Chuck Lever4c568012007-12-10 14:59:28 -05001392 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001393
1394 if (args->mount_server.version == 0) {
1395 if (args->flags & NFS_MOUNT_VER3)
1396 args->mount_server.version = NFS_MNT3_VERSION;
1397 else
1398 args->mount_server.version = NFS_MNT_VERSION;
1399 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001400 request.version = args->mount_server.version;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001401
Chuck Lever33832032007-12-10 14:59:13 -05001402 if (args->mount_server.hostname)
Chuck Leverc5d120f2008-12-23 15:21:35 -05001403 request.hostname = args->mount_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001404 else
Chuck Leverc5d120f2008-12-23 15:21:35 -05001405 request.hostname = args->nfs_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001406
Chuck Lever0076d7b2007-07-01 12:13:49 -04001407 /*
1408 * Construct the mount server's address.
1409 */
Chuck Lever4c568012007-12-10 14:59:28 -05001410 if (args->mount_server.address.ss_family == AF_UNSPEC) {
Chuck Leverc5d120f2008-12-23 15:21:35 -05001411 memcpy(request.sap, &args->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -05001412 args->nfs_server.addrlen);
1413 args->mount_server.addrlen = args->nfs_server.addrlen;
1414 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001415 request.salen = args->mount_server.addrlen;
Chuck Lever4c568012007-12-10 14:59:28 -05001416
James Lentiniaad70002007-09-24 17:32:49 -04001417 /*
1418 * autobind will be used if mount_server.port == 0
1419 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001420 nfs_set_port(request.sap, args->mount_server.port);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001421
1422 /*
1423 * Now ask the mount server to map our export path
1424 * to a file handle.
1425 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001426 status = nfs_mount(&request);
Chuck Leverefd83402007-09-11 18:00:58 -04001427 if (status == 0)
1428 return 0;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001429
Chuck Lever396cee972008-06-12 12:37:49 -04001430 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
Chuck Leverc5d120f2008-12-23 15:21:35 -05001431 request.hostname, status);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001432 return status;
1433}
1434
Chuck Leverd1aa0822008-06-23 12:36:45 -04001435static int nfs_parse_simple_hostname(const char *dev_name,
1436 char **hostname, size_t maxnamlen,
1437 char **export_path, size_t maxpathlen)
Chuck Leverdc045892008-06-23 12:36:37 -04001438{
1439 size_t len;
1440 char *colon, *comma;
1441
1442 colon = strchr(dev_name, ':');
1443 if (colon == NULL)
1444 goto out_bad_devname;
1445
1446 len = colon - dev_name;
1447 if (len > maxnamlen)
1448 goto out_hostname;
1449
1450 /* N.B. caller will free nfs_server.hostname in all cases */
1451 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1452 if (!*hostname)
1453 goto out_nomem;
1454
1455 /* kill possible hostname list: not supported */
1456 comma = strchr(*hostname, ',');
1457 if (comma != NULL) {
1458 if (comma == *hostname)
1459 goto out_bad_devname;
1460 *comma = '\0';
1461 }
1462
1463 colon++;
1464 len = strlen(colon);
1465 if (len > maxpathlen)
1466 goto out_path;
1467 *export_path = kstrndup(colon, len, GFP_KERNEL);
1468 if (!*export_path)
1469 goto out_nomem;
1470
1471 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1472 return 0;
1473
1474out_bad_devname:
1475 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1476 return -EINVAL;
1477
1478out_nomem:
1479 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1480 return -ENOMEM;
1481
1482out_hostname:
1483 dfprintk(MOUNT, "NFS: server hostname too long\n");
1484 return -ENAMETOOLONG;
1485
1486out_path:
1487 dfprintk(MOUNT, "NFS: export pathname too long\n");
1488 return -ENAMETOOLONG;
1489}
1490
1491/*
Chuck Leverd1aa0822008-06-23 12:36:45 -04001492 * Hostname has square brackets around it because it contains one or
1493 * more colons. We look for the first closing square bracket, and a
1494 * colon must follow it.
1495 */
1496static int nfs_parse_protected_hostname(const char *dev_name,
1497 char **hostname, size_t maxnamlen,
1498 char **export_path, size_t maxpathlen)
1499{
1500 size_t len;
1501 char *start, *end;
1502
1503 start = (char *)(dev_name + 1);
1504
1505 end = strchr(start, ']');
1506 if (end == NULL)
1507 goto out_bad_devname;
1508 if (*(end + 1) != ':')
1509 goto out_bad_devname;
1510
1511 len = end - start;
1512 if (len > maxnamlen)
1513 goto out_hostname;
1514
1515 /* N.B. caller will free nfs_server.hostname in all cases */
1516 *hostname = kstrndup(start, len, GFP_KERNEL);
1517 if (*hostname == NULL)
1518 goto out_nomem;
1519
1520 end += 2;
1521 len = strlen(end);
1522 if (len > maxpathlen)
1523 goto out_path;
1524 *export_path = kstrndup(end, len, GFP_KERNEL);
1525 if (!*export_path)
1526 goto out_nomem;
1527
1528 return 0;
1529
1530out_bad_devname:
1531 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1532 return -EINVAL;
1533
1534out_nomem:
1535 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1536 return -ENOMEM;
1537
1538out_hostname:
1539 dfprintk(MOUNT, "NFS: server hostname too long\n");
1540 return -ENAMETOOLONG;
1541
1542out_path:
1543 dfprintk(MOUNT, "NFS: export pathname too long\n");
1544 return -ENAMETOOLONG;
1545}
1546
1547/*
1548 * Split "dev_name" into "hostname:export_path".
1549 *
1550 * The leftmost colon demarks the split between the server's hostname
1551 * and the export path. If the hostname starts with a left square
1552 * bracket, then it may contain colons.
1553 *
1554 * Note: caller frees hostname and export path, even on error.
1555 */
1556static int nfs_parse_devname(const char *dev_name,
1557 char **hostname, size_t maxnamlen,
1558 char **export_path, size_t maxpathlen)
1559{
1560 if (*dev_name == '[')
1561 return nfs_parse_protected_hostname(dev_name,
1562 hostname, maxnamlen,
1563 export_path, maxpathlen);
1564
1565 return nfs_parse_simple_hostname(dev_name,
1566 hostname, maxnamlen,
1567 export_path, maxpathlen);
1568}
1569
1570/*
David Howells54ceac42006-08-22 20:06:13 -04001571 * Validate the NFS2/NFS3 mount data
1572 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001573 *
1574 * For option strings, user space handles the following behaviors:
1575 *
1576 * + DNS: mapping server host name to IP address ("addr=" option)
1577 *
1578 * + failure mode: how to behave if a mount request can't be handled
1579 * immediately ("fg/bg" option)
1580 *
1581 * + retry: how often to retry a mount request ("retry=" option)
1582 *
1583 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1584 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001585 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001586static int nfs_validate_mount_data(void *options,
1587 struct nfs_parsed_mount_data *args,
Chuck Lever136d5582007-07-01 12:13:54 -04001588 struct nfs_fh *mntfh,
1589 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001590{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001591 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever136d5582007-07-01 12:13:54 -04001592
Chuck Lever5df36e72007-07-01 12:12:56 -04001593 if (data == NULL)
1594 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001595
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001596 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1597 args->rsize = NFS_MAX_FILE_IO_SIZE;
1598 args->wsize = NFS_MAX_FILE_IO_SIZE;
Chuck Lever0e0cab72008-06-26 17:47:12 -04001599 args->acregmin = NFS_DEF_ACREGMIN;
1600 args->acregmax = NFS_DEF_ACREGMAX;
1601 args->acdirmin = NFS_DEF_ACDIRMIN;
1602 args->acdirmax = NFS_DEF_ACDIRMAX;
Chuck Leverf22d6d72008-03-14 14:10:22 -04001603 args->mount_server.port = 0; /* autobind unless user sets port */
Chuck Leverf22d6d72008-03-14 14:10:22 -04001604 args->nfs_server.port = 0; /* autobind unless user sets port */
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001605 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverdd07c942008-06-24 16:33:46 -04001606 args->auth_flavors[0] = RPC_AUTH_UNIX;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001607
David Howellsf7b422b2006-06-09 09:34:33 -04001608 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001609 case 1:
1610 data->namlen = 0;
1611 case 2:
1612 data->bsize = 0;
1613 case 3:
1614 if (data->flags & NFS_MOUNT_VER3)
1615 goto out_no_v3;
1616 data->root.size = NFS2_FHSIZE;
1617 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1618 case 4:
1619 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1620 goto out_no_sec;
1621 case 5:
1622 memset(data->context, 0, sizeof(data->context));
1623 case 6:
Trond Myklebustb7e24452008-06-19 15:21:11 -04001624 if (data->flags & NFS_MOUNT_VER3) {
1625 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1626 goto out_invalid_fh;
Chuck Lever5df36e72007-07-01 12:12:56 -04001627 mntfh->size = data->root.size;
Trond Myklebustb7e24452008-06-19 15:21:11 -04001628 } else
Chuck Lever5df36e72007-07-01 12:12:56 -04001629 mntfh->size = NFS2_FHSIZE;
1630
Chuck Lever5df36e72007-07-01 12:12:56 -04001631
1632 memcpy(mntfh->data, data->root.data, mntfh->size);
1633 if (mntfh->size < sizeof(mntfh->data))
1634 memset(mntfh->data + mntfh->size, 0,
1635 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001636
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001637 /*
1638 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1639 * can deal with.
1640 */
Trond Myklebustff3525a2008-08-15 16:59:14 -04001641 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001642 args->rsize = data->rsize;
1643 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001644 args->timeo = data->timeo;
1645 args->retrans = data->retrans;
1646 args->acregmin = data->acregmin;
1647 args->acregmax = data->acregmax;
1648 args->acdirmin = data->acdirmin;
1649 args->acdirmax = data->acdirmax;
Chuck Lever4c568012007-12-10 14:59:28 -05001650
1651 memcpy(&args->nfs_server.address, &data->addr,
1652 sizeof(data->addr));
1653 args->nfs_server.addrlen = sizeof(data->addr);
1654 if (!nfs_verify_server_address((struct sockaddr *)
1655 &args->nfs_server.address))
1656 goto out_no_address;
1657
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001658 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001659 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001660 /* N.B. caller will free nfs_server.hostname in all cases */
1661 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1662 args->namlen = data->namlen;
1663 args->bsize = data->bsize;
Chuck Leverdd07c942008-06-24 16:33:46 -04001664
1665 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1666 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001667 if (!args->nfs_server.hostname)
1668 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001669
1670 /*
1671 * The legacy version 6 binary mount data from userspace has a
1672 * field used only to transport selinux information into the
1673 * the kernel. To continue to support that functionality we
1674 * have a touch of selinux knowledge here in the NFS code. The
1675 * userspace code converted context=blah to just blah so we are
1676 * converting back to the full string selinux understands.
1677 */
1678 if (data->context[0]){
1679#ifdef CONFIG_SECURITY_SELINUX
1680 int rc;
1681 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1682 if (!opts_str)
1683 return -ENOMEM;
1684 strcpy(opts_str, "context=");
1685 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1686 strcat(opts_str, &data->context[0]);
1687 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1688 kfree(opts_str);
1689 if (rc)
1690 return rc;
1691#else
1692 return -EINVAL;
1693#endif
1694 }
1695
Chuck Lever5df36e72007-07-01 12:12:56 -04001696 break;
Chuck Lever136d5582007-07-01 12:13:54 -04001697 default: {
Chuck Lever136d5582007-07-01 12:13:54 -04001698 int status;
Chuck Lever136d5582007-07-01 12:13:54 -04001699
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001700 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever136d5582007-07-01 12:13:54 -04001701 return -EINVAL;
1702
Chuck Lever6e88e062007-09-24 15:39:50 -04001703 if (!nfs_verify_server_address((struct sockaddr *)
1704 &args->nfs_server.address))
1705 goto out_no_address;
1706
Chuck Levered596a82008-06-26 17:47:05 -04001707 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1708 args->nfs_server.port);
1709
Trond Myklebust259875e2008-07-02 14:43:47 -04001710 nfs_set_mount_transport_protocol(args);
1711
Chuck Leverdc045892008-06-23 12:36:37 -04001712 status = nfs_parse_devname(dev_name,
1713 &args->nfs_server.hostname,
1714 PAGE_SIZE,
1715 &args->nfs_server.export_path,
1716 NFS_MAXPATHLEN);
1717 if (!status)
1718 status = nfs_try_mount(args, mntfh);
Chuck Lever136d5582007-07-01 12:13:54 -04001719
Chuck Leverdc045892008-06-23 12:36:37 -04001720 kfree(args->nfs_server.export_path);
1721 args->nfs_server.export_path = NULL;
Chuck Lever136d5582007-07-01 12:13:54 -04001722
Chuck Lever136d5582007-07-01 12:13:54 -04001723 if (status)
Chuck Leverfdc6e2c2007-08-29 17:58:59 -04001724 return status;
Chuck Lever136d5582007-07-01 12:13:54 -04001725
Chuck Lever136d5582007-07-01 12:13:54 -04001726 break;
1727 }
David Howellsf7b422b2006-06-09 09:34:33 -04001728 }
David Howells54ceac42006-08-22 20:06:13 -04001729
David Howellsf7b422b2006-06-09 09:34:33 -04001730#ifndef CONFIG_NFS_V3
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001731 if (args->flags & NFS_MOUNT_VER3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001732 goto out_v3_not_compiled;
1733#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001734
David Howells54ceac42006-08-22 20:06:13 -04001735 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04001736
1737out_no_data:
1738 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1739 return -EINVAL;
1740
1741out_no_v3:
1742 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1743 data->version);
1744 return -EINVAL;
1745
1746out_no_sec:
1747 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1748 return -EINVAL;
1749
Chuck Lever5df36e72007-07-01 12:12:56 -04001750#ifndef CONFIG_NFS_V3
1751out_v3_not_compiled:
1752 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1753 return -EPROTONOSUPPORT;
1754#endif /* !CONFIG_NFS_V3 */
1755
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001756out_nomem:
1757 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1758 return -ENOMEM;
1759
Chuck Lever5df36e72007-07-01 12:12:56 -04001760out_no_address:
1761 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1762 return -EINVAL;
1763
1764out_invalid_fh:
1765 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1766 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04001767}
1768
Jeff Layton48b605f2008-06-10 15:38:39 -04001769static int
1770nfs_compare_remount_data(struct nfs_server *nfss,
1771 struct nfs_parsed_mount_data *data)
1772{
1773 if (data->flags != nfss->flags ||
1774 data->rsize != nfss->rsize ||
1775 data->wsize != nfss->wsize ||
1776 data->retrans != nfss->client->cl_timeout->to_retries ||
1777 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1778 data->acregmin != nfss->acregmin / HZ ||
1779 data->acregmax != nfss->acregmax / HZ ||
1780 data->acdirmin != nfss->acdirmin / HZ ||
1781 data->acdirmax != nfss->acdirmax / HZ ||
1782 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1783 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1784 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1785 data->nfs_server.addrlen) != 0)
1786 return -EINVAL;
1787
1788 return 0;
1789}
1790
1791static int
1792nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1793{
1794 int error;
1795 struct nfs_server *nfss = sb->s_fs_info;
1796 struct nfs_parsed_mount_data *data;
1797 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1798 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
Trond Myklebustcd100722008-06-17 16:12:00 -04001799 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
Jeff Layton48b605f2008-06-10 15:38:39 -04001800
1801 /*
1802 * Userspace mount programs that send binary options generally send
1803 * them populated with default values. We have no way to know which
1804 * ones were explicitly specified. Fall back to legacy behavior and
1805 * just return success.
1806 */
Marc Zyngier31c94462008-07-17 13:21:55 +02001807 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1808 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1809 options->version <= 6))))
Jeff Layton48b605f2008-06-10 15:38:39 -04001810 return 0;
1811
1812 data = kzalloc(sizeof(*data), GFP_KERNEL);
1813 if (data == NULL)
1814 return -ENOMEM;
1815
1816 /* fill out struct with values from existing mount */
1817 data->flags = nfss->flags;
1818 data->rsize = nfss->rsize;
1819 data->wsize = nfss->wsize;
1820 data->retrans = nfss->client->cl_timeout->to_retries;
1821 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1822 data->acregmin = nfss->acregmin / HZ;
1823 data->acregmax = nfss->acregmax / HZ;
1824 data->acdirmin = nfss->acdirmin / HZ;
1825 data->acdirmax = nfss->acdirmax / HZ;
1826 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1827 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1828 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1829 data->nfs_server.addrlen);
1830
1831 /* overwrite those values with any that were specified */
1832 error = nfs_parse_mount_options((char *)options, data);
1833 if (error < 0)
1834 goto out;
1835
1836 /* compare new mount options with old ones */
1837 error = nfs_compare_remount_data(nfss, data);
1838out:
1839 kfree(data);
1840 return error;
1841}
1842
David Howells54ceac42006-08-22 20:06:13 -04001843/*
1844 * Initialise the common bits of the superblock
1845 */
1846static inline void nfs_initialise_sb(struct super_block *sb)
1847{
1848 struct nfs_server *server = NFS_SB(sb);
1849
1850 sb->s_magic = NFS_SUPER_MAGIC;
1851
1852 /* We probably want something more informative here */
1853 snprintf(sb->s_id, sizeof(sb->s_id),
1854 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1855
1856 if (sb->s_blocksize == 0)
1857 sb->s_blocksize = nfs_block_bits(server->wsize,
1858 &sb->s_blocksize_bits);
1859
1860 if (server->flags & NFS_MOUNT_NOAC)
1861 sb->s_flags |= MS_SYNCHRONOUS;
1862
1863 nfs_super_set_maxbytes(sb, server->maxfilesize);
1864}
1865
1866/*
1867 * Finish setting up an NFS2/3 superblock
1868 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001869static void nfs_fill_super(struct super_block *sb,
1870 struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -04001871{
1872 struct nfs_server *server = NFS_SB(sb);
1873
1874 sb->s_blocksize_bits = 0;
1875 sb->s_blocksize = 0;
1876 if (data->bsize)
1877 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1878
1879 if (server->flags & NFS_MOUNT_VER3) {
1880 /* The VFS shouldn't apply the umask to mode bits. We will do
1881 * so ourselves when necessary.
1882 */
1883 sb->s_flags |= MS_POSIXACL;
1884 sb->s_time_gran = 1;
1885 }
1886
1887 sb->s_op = &nfs_sops;
1888 nfs_initialise_sb(sb);
1889}
1890
1891/*
1892 * Finish setting up a cloned NFS2/3 superblock
1893 */
1894static void nfs_clone_super(struct super_block *sb,
1895 const struct super_block *old_sb)
1896{
1897 struct nfs_server *server = NFS_SB(sb);
1898
1899 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1900 sb->s_blocksize = old_sb->s_blocksize;
1901 sb->s_maxbytes = old_sb->s_maxbytes;
1902
1903 if (server->flags & NFS_MOUNT_VER3) {
1904 /* The VFS shouldn't apply the umask to mode bits. We will do
1905 * so ourselves when necessary.
1906 */
1907 sb->s_flags |= MS_POSIXACL;
1908 sb->s_time_gran = 1;
1909 }
1910
1911 sb->s_op = old_sb->s_op;
1912 nfs_initialise_sb(sb);
1913}
1914
Trond Myklebust275a5d22007-05-16 16:53:28 -04001915static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1916{
1917 const struct nfs_server *a = s->s_fs_info;
1918 const struct rpc_clnt *clnt_a = a->client;
1919 const struct rpc_clnt *clnt_b = b->client;
1920
1921 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1922 goto Ebusy;
1923 if (a->nfs_client != b->nfs_client)
1924 goto Ebusy;
1925 if (a->flags != b->flags)
1926 goto Ebusy;
1927 if (a->wsize != b->wsize)
1928 goto Ebusy;
1929 if (a->rsize != b->rsize)
1930 goto Ebusy;
1931 if (a->acregmin != b->acregmin)
1932 goto Ebusy;
1933 if (a->acregmax != b->acregmax)
1934 goto Ebusy;
1935 if (a->acdirmin != b->acdirmin)
1936 goto Ebusy;
1937 if (a->acdirmax != b->acdirmax)
1938 goto Ebusy;
1939 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1940 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001941 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04001942Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001943 return 0;
1944}
1945
1946struct nfs_sb_mountdata {
1947 struct nfs_server *server;
1948 int mntflags;
1949};
1950
1951static int nfs_set_super(struct super_block *s, void *data)
1952{
1953 struct nfs_sb_mountdata *sb_mntdata = data;
1954 struct nfs_server *server = sb_mntdata->server;
1955 int ret;
1956
1957 s->s_flags = sb_mntdata->mntflags;
1958 s->s_fs_info = server;
1959 ret = set_anon_super(s, server);
1960 if (ret == 0)
1961 server->s_dev = s->s_dev;
1962 return ret;
1963}
1964
Chuck Leverfd00a8f2007-12-10 14:57:38 -05001965static int nfs_compare_super_address(struct nfs_server *server1,
1966 struct nfs_server *server2)
1967{
1968 struct sockaddr *sap1, *sap2;
1969
1970 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1971 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1972
1973 if (sap1->sa_family != sap2->sa_family)
1974 return 0;
1975
1976 switch (sap1->sa_family) {
1977 case AF_INET: {
1978 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1979 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1980 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1981 return 0;
1982 if (sin1->sin_port != sin2->sin_port)
1983 return 0;
1984 break;
1985 }
1986 case AF_INET6: {
1987 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1988 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1989 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1990 return 0;
1991 if (sin1->sin6_port != sin2->sin6_port)
1992 return 0;
1993 break;
1994 }
1995 default:
1996 return 0;
1997 }
1998
1999 return 1;
2000}
2001
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002002static int nfs_compare_super(struct super_block *sb, void *data)
2003{
2004 struct nfs_sb_mountdata *sb_mntdata = data;
2005 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2006 int mntflags = sb_mntdata->mntflags;
2007
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002008 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002009 return 0;
2010 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2011 if (old->flags & NFS_MOUNT_UNSHARED)
2012 return 0;
2013 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2014 return 0;
2015 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04002016}
2017
Miklos Szeredifa799752008-04-30 00:54:33 -07002018static int nfs_bdi_register(struct nfs_server *server)
2019{
2020 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2021}
2022
David Howells54ceac42006-08-22 20:06:13 -04002023static int nfs_get_sb(struct file_system_type *fs_type,
2024 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2025{
2026 struct nfs_server *server = NULL;
2027 struct super_block *s;
Trond Myklebust33852a12008-06-19 14:20:11 -04002028 struct nfs_parsed_mount_data *data;
2029 struct nfs_fh *mntfh;
David Howells54ceac42006-08-22 20:06:13 -04002030 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002031 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002032 struct nfs_sb_mountdata sb_mntdata = {
2033 .mntflags = flags,
2034 };
Trond Myklebust33852a12008-06-19 14:20:11 -04002035 int error = -ENOMEM;
David Howells54ceac42006-08-22 20:06:13 -04002036
Trond Myklebust33852a12008-06-19 14:20:11 -04002037 data = kzalloc(sizeof(*data), GFP_KERNEL);
2038 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2039 if (data == NULL || mntfh == NULL)
2040 goto out_free_fh;
2041
2042 security_init_mnt_opts(&data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002043
David Howells54ceac42006-08-22 20:06:13 -04002044 /* Validate the mount data */
Trond Myklebust33852a12008-06-19 14:20:11 -04002045 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
David Howells54ceac42006-08-22 20:06:13 -04002046 if (error < 0)
Chuck Lever06559602007-07-01 12:12:35 -04002047 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002048
2049 /* Get a volume representation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002050 server = nfs_create_server(data, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002051 if (IS_ERR(server)) {
2052 error = PTR_ERR(server);
Chuck Lever06559602007-07-01 12:12:35 -04002053 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002054 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002055 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002056
Trond Myklebust75180df2007-05-16 16:53:28 -04002057 if (server->flags & NFS_MOUNT_UNSHARED)
2058 compare_super = NULL;
2059
David Howells54ceac42006-08-22 20:06:13 -04002060 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002061 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002062 if (IS_ERR(s)) {
2063 error = PTR_ERR(s);
David Howells54ceac42006-08-22 20:06:13 -04002064 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04002065 }
2066
David Howells54ceac42006-08-22 20:06:13 -04002067 if (s->s_fs_info != server) {
2068 nfs_free_server(server);
2069 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002070 } else {
2071 error = nfs_bdi_register(server);
2072 if (error)
2073 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04002074 }
David Howells54ceac42006-08-22 20:06:13 -04002075
2076 if (!s->s_root) {
2077 /* initial superblock/root creation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002078 nfs_fill_super(s, data);
David Howells08734042009-04-03 16:42:42 +01002079 nfs_fscache_get_super_cookie(s, data);
David Howells54ceac42006-08-22 20:06:13 -04002080 }
2081
Trond Myklebust33852a12008-06-19 14:20:11 -04002082 mntroot = nfs_get_root(s, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002083 if (IS_ERR(mntroot)) {
2084 error = PTR_ERR(mntroot);
2085 goto error_splat_super;
2086 }
2087
Trond Myklebust33852a12008-06-19 14:20:11 -04002088 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002089 if (error)
2090 goto error_splat_root;
2091
David Howellsf7b422b2006-06-09 09:34:33 -04002092 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04002093 mnt->mnt_sb = s;
2094 mnt->mnt_root = mntroot;
Chuck Lever06559602007-07-01 12:12:35 -04002095 error = 0;
2096
2097out:
Trond Myklebust33852a12008-06-19 14:20:11 -04002098 kfree(data->nfs_server.hostname);
2099 kfree(data->mount_server.hostname);
David Howells08734042009-04-03 16:42:42 +01002100 kfree(data->fscache_uniq);
Trond Myklebust33852a12008-06-19 14:20:11 -04002101 security_free_mnt_opts(&data->lsm_opts);
2102out_free_fh:
2103 kfree(mntfh);
2104 kfree(data);
Chuck Lever06559602007-07-01 12:12:35 -04002105 return error;
Trond Myklebust816724e2006-06-24 08:41:41 -04002106
David Howells54ceac42006-08-22 20:06:13 -04002107out_err_nosb:
2108 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04002109 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002110
Eric Parisf9c3a382008-03-05 14:20:18 -05002111error_splat_root:
2112 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04002113error_splat_super:
2114 up_write(&s->s_umount);
2115 deactivate_super(s);
Chuck Lever06559602007-07-01 12:12:35 -04002116 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002117}
2118
David Howells54ceac42006-08-22 20:06:13 -04002119/*
2120 * Destroy an NFS2/3 superblock
2121 */
David Howellsf7b422b2006-06-09 09:34:33 -04002122static void nfs_kill_super(struct super_block *s)
2123{
2124 struct nfs_server *server = NFS_SB(s);
2125
Miklos Szeredifa799752008-04-30 00:54:33 -07002126 bdi_unregister(&server->backing_dev_info);
David Howellsf7b422b2006-06-09 09:34:33 -04002127 kill_anon_super(s);
David Howells08734042009-04-03 16:42:42 +01002128 nfs_fscache_release_super_cookie(s);
David Howells54ceac42006-08-22 20:06:13 -04002129 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002130}
2131
David Howells54ceac42006-08-22 20:06:13 -04002132/*
2133 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2134 */
2135static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2136 const char *dev_name, void *raw_data,
2137 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002138{
2139 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002140 struct super_block *s;
2141 struct nfs_server *server;
2142 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002143 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002144 struct nfs_sb_mountdata sb_mntdata = {
2145 .mntflags = flags,
2146 };
David Howells54ceac42006-08-22 20:06:13 -04002147 int error;
2148
2149 dprintk("--> nfs_xdev_get_sb()\n");
2150
2151 /* create a new volume representation */
2152 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2153 if (IS_ERR(server)) {
2154 error = PTR_ERR(server);
2155 goto out_err_noserver;
2156 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002157 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002158
Trond Myklebust75180df2007-05-16 16:53:28 -04002159 if (server->flags & NFS_MOUNT_UNSHARED)
2160 compare_super = NULL;
2161
David Howells54ceac42006-08-22 20:06:13 -04002162 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002163 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002164 if (IS_ERR(s)) {
2165 error = PTR_ERR(s);
2166 goto out_err_nosb;
2167 }
2168
2169 if (s->s_fs_info != server) {
2170 nfs_free_server(server);
2171 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002172 } else {
2173 error = nfs_bdi_register(server);
2174 if (error)
2175 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002176 }
2177
2178 if (!s->s_root) {
2179 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002180 nfs_clone_super(s, data->sb);
2181 }
2182
2183 mntroot = nfs_get_root(s, data->fh);
2184 if (IS_ERR(mntroot)) {
2185 error = PTR_ERR(mntroot);
2186 goto error_splat_super;
2187 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002188 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
Neil Brown4c1fe2f2007-11-01 16:50:20 +11002189 dput(mntroot);
2190 error = -ESTALE;
2191 goto error_splat_super;
2192 }
David Howells54ceac42006-08-22 20:06:13 -04002193
2194 s->s_flags |= MS_ACTIVE;
2195 mnt->mnt_sb = s;
2196 mnt->mnt_root = mntroot;
2197
Eric Parisf9c3a382008-03-05 14:20:18 -05002198 /* clone any lsm security options from the parent to the new sb */
2199 security_sb_clone_mnt_opts(data->sb, s);
2200
David Howells54ceac42006-08-22 20:06:13 -04002201 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2202 return 0;
2203
2204out_err_nosb:
2205 nfs_free_server(server);
2206out_err_noserver:
2207 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2208 return error;
2209
2210error_splat_super:
2211 up_write(&s->s_umount);
2212 deactivate_super(s);
2213 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2214 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002215}
2216
2217#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -04002218
2219/*
2220 * Finish setting up a cloned NFS4 superblock
2221 */
2222static void nfs4_clone_super(struct super_block *sb,
2223 const struct super_block *old_sb)
David Howellsf7b422b2006-06-09 09:34:33 -04002224{
David Howells54ceac42006-08-22 20:06:13 -04002225 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2226 sb->s_blocksize = old_sb->s_blocksize;
2227 sb->s_maxbytes = old_sb->s_maxbytes;
2228 sb->s_time_gran = 1;
2229 sb->s_op = old_sb->s_op;
2230 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002231}
2232
2233/*
2234 * Set up an NFS4 superblock
2235 */
David Howells54ceac42006-08-22 20:06:13 -04002236static void nfs4_fill_super(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -04002237{
David Howellsf7b422b2006-06-09 09:34:33 -04002238 sb->s_time_gran = 1;
David Howellsf7b422b2006-06-09 09:34:33 -04002239 sb->s_op = &nfs4_sops;
David Howells54ceac42006-08-22 20:06:13 -04002240 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002241}
2242
David Howells54ceac42006-08-22 20:06:13 -04002243/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04002244 * Validate NFSv4 mount options
2245 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002246static int nfs4_validate_mount_data(void *options,
2247 struct nfs_parsed_mount_data *args,
2248 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04002249{
Chuck Lever4c568012007-12-10 14:59:28 -05002250 struct sockaddr_in *ap;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002251 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002252 char *c;
2253
2254 if (data == NULL)
2255 goto out_no_data;
2256
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002257 args->rsize = NFS_MAX_FILE_IO_SIZE;
2258 args->wsize = NFS_MAX_FILE_IO_SIZE;
Chuck Lever0e0cab72008-06-26 17:47:12 -04002259 args->acregmin = NFS_DEF_ACREGMIN;
2260 args->acregmax = NFS_DEF_ACREGMAX;
2261 args->acdirmin = NFS_DEF_ACDIRMIN;
2262 args->acdirmax = NFS_DEF_ACDIRMAX;
Chuck Leverf22d6d72008-03-14 14:10:22 -04002263 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
Chuck Lever6738b252008-06-24 16:33:54 -04002264 args->auth_flavors[0] = RPC_AUTH_UNIX;
2265 args->auth_flavor_len = 0;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002266
Chuck Leverf0768eb2007-07-01 12:13:01 -04002267 switch (data->version) {
2268 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05002269 ap = (struct sockaddr_in *)&args->nfs_server.address;
2270 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002271 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05002272 if (data->host_addrlen == 0)
2273 goto out_no_address;
2274 args->nfs_server.addrlen = data->host_addrlen;
2275 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002276 return -EFAULT;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002277 if (!nfs_verify_server_address((struct sockaddr *)
2278 &args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002279 goto out_no_address;
2280
Chuck Lever6738b252008-06-24 16:33:54 -04002281 if (data->auth_flavourlen) {
2282 if (data->auth_flavourlen > 1)
2283 goto out_inval_auth;
Trond Myklebust20c71f52007-09-20 20:23:51 -04002284 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002285 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04002286 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002287 return -EFAULT;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002288 }
2289
2290 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2291 if (IS_ERR(c))
2292 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002293 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002294
2295 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2296 if (IS_ERR(c))
2297 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002298 args->nfs_server.export_path = c;
2299 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002300
2301 c = strndup_user(data->client_addr.data, 16);
2302 if (IS_ERR(c))
2303 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002304 args->client_address = c;
2305
2306 /*
2307 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2308 * can deal with.
2309 */
2310
2311 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2312 args->rsize = data->rsize;
2313 args->wsize = data->wsize;
2314 args->timeo = data->timeo;
2315 args->retrans = data->retrans;
2316 args->acregmin = data->acregmin;
2317 args->acregmax = data->acregmax;
2318 args->acdirmin = data->acdirmin;
2319 args->acdirmax = data->acdirmax;
2320 args->nfs_server.protocol = data->proto;
Trond Myklebust259875e2008-07-02 14:43:47 -04002321 nfs_validate_transport_protocol(args);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002322
2323 break;
Chuck Lever80071222007-07-01 12:13:59 -04002324 default: {
Chuck Leverdc045892008-06-23 12:36:37 -04002325 int status;
Chuck Lever80071222007-07-01 12:13:59 -04002326
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002327 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever80071222007-07-01 12:13:59 -04002328 return -EINVAL;
2329
2330 if (!nfs_verify_server_address((struct sockaddr *)
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002331 &args->nfs_server.address))
Chuck Lever80071222007-07-01 12:13:59 -04002332 return -EINVAL;
Chuck Lever80071222007-07-01 12:13:59 -04002333
Chuck Levered596a82008-06-26 17:47:05 -04002334 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2335 args->nfs_server.port);
2336
Trond Myklebust259875e2008-07-02 14:43:47 -04002337 nfs_validate_transport_protocol(args);
2338
Chuck Lever6738b252008-06-24 16:33:54 -04002339 if (args->auth_flavor_len > 1)
Chuck Lever80071222007-07-01 12:13:59 -04002340 goto out_inval_auth;
Chuck Lever80071222007-07-01 12:13:59 -04002341
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002342 if (args->client_address == NULL)
Jeff Layton0a87cf12007-07-18 11:28:43 -04002343 goto out_no_client_address;
2344
Chuck Leverdc045892008-06-23 12:36:37 -04002345 status = nfs_parse_devname(dev_name,
2346 &args->nfs_server.hostname,
2347 NFS4_MAXNAMLEN,
2348 &args->nfs_server.export_path,
2349 NFS4_MAXPATHLEN);
2350 if (status < 0)
2351 return status;
2352
Chuck Lever80071222007-07-01 12:13:59 -04002353 break;
2354 }
Chuck Leverf0768eb2007-07-01 12:13:01 -04002355 }
2356
2357 return 0;
2358
2359out_no_data:
2360 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2361 return -EINVAL;
2362
2363out_inval_auth:
2364 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2365 data->auth_flavourlen);
2366 return -EINVAL;
2367
2368out_no_address:
2369 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2370 return -EINVAL;
Jeff Layton0a87cf12007-07-18 11:28:43 -04002371
2372out_no_client_address:
2373 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2374 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002375}
2376
2377/*
David Howells54ceac42006-08-22 20:06:13 -04002378 * Get the superblock for an NFS4 mountpoint
2379 */
Trond Myklebust816724e2006-06-24 08:41:41 -04002380static int nfs4_get_sb(struct file_system_type *fs_type,
2381 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002382{
Trond Myklebust33852a12008-06-19 14:20:11 -04002383 struct nfs_parsed_mount_data *data;
David Howells54ceac42006-08-22 20:06:13 -04002384 struct super_block *s;
2385 struct nfs_server *server;
Trond Myklebust33852a12008-06-19 14:20:11 -04002386 struct nfs_fh *mntfh;
David Howells54ceac42006-08-22 20:06:13 -04002387 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002388 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002389 struct nfs_sb_mountdata sb_mntdata = {
2390 .mntflags = flags,
2391 };
Trond Myklebust33852a12008-06-19 14:20:11 -04002392 int error = -ENOMEM;
David Howellsf7b422b2006-06-09 09:34:33 -04002393
Trond Myklebust33852a12008-06-19 14:20:11 -04002394 data = kzalloc(sizeof(*data), GFP_KERNEL);
2395 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2396 if (data == NULL || mntfh == NULL)
2397 goto out_free_fh;
2398
2399 security_init_mnt_opts(&data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002400
Chuck Leverf0768eb2007-07-01 12:13:01 -04002401 /* Validate the mount data */
Trond Myklebust33852a12008-06-19 14:20:11 -04002402 error = nfs4_validate_mount_data(raw_data, data, dev_name);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002403 if (error < 0)
2404 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002405
David Howells54ceac42006-08-22 20:06:13 -04002406 /* Get a volume representation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002407 server = nfs4_create_server(data, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002408 if (IS_ERR(server)) {
2409 error = PTR_ERR(server);
Chuck Lever29eb9812007-07-01 12:12:30 -04002410 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002411 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002412 sb_mntdata.server = server;
David Howellsf7b422b2006-06-09 09:34:33 -04002413
Trond Myklebust75180df2007-05-16 16:53:28 -04002414 if (server->flags & NFS4_MOUNT_UNSHARED)
2415 compare_super = NULL;
2416
David Howells54ceac42006-08-22 20:06:13 -04002417 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002418 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002419 if (IS_ERR(s)) {
2420 error = PTR_ERR(s);
David Howellsf7b422b2006-06-09 09:34:33 -04002421 goto out_free;
Trond Myklebust816724e2006-06-24 08:41:41 -04002422 }
2423
Trond Myklebust5dd31772006-08-24 01:03:05 -04002424 if (s->s_fs_info != server) {
2425 nfs_free_server(server);
2426 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002427 } else {
2428 error = nfs_bdi_register(server);
2429 if (error)
2430 goto error_splat_super;
Trond Myklebust5dd31772006-08-24 01:03:05 -04002431 }
2432
David Howells54ceac42006-08-22 20:06:13 -04002433 if (!s->s_root) {
2434 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002435 nfs4_fill_super(s);
David Howells08734042009-04-03 16:42:42 +01002436 nfs_fscache_get_super_cookie(s, data);
Trond Myklebust816724e2006-06-24 08:41:41 -04002437 }
David Howellsf7b422b2006-06-09 09:34:33 -04002438
Trond Myklebust33852a12008-06-19 14:20:11 -04002439 mntroot = nfs4_get_root(s, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002440 if (IS_ERR(mntroot)) {
2441 error = PTR_ERR(mntroot);
2442 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04002443 }
David Howells54ceac42006-08-22 20:06:13 -04002444
Trond Myklebust33852a12008-06-19 14:20:11 -04002445 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
Eric Paris46c8ac72008-05-02 13:42:42 -07002446 if (error)
2447 goto error_splat_root;
2448
David Howellsf7b422b2006-06-09 09:34:33 -04002449 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04002450 mnt->mnt_sb = s;
2451 mnt->mnt_root = mntroot;
Chuck Lever29eb9812007-07-01 12:12:30 -04002452 error = 0;
David Howells54ceac42006-08-22 20:06:13 -04002453
Chuck Lever29eb9812007-07-01 12:12:30 -04002454out:
Trond Myklebust33852a12008-06-19 14:20:11 -04002455 kfree(data->client_address);
2456 kfree(data->nfs_server.export_path);
2457 kfree(data->nfs_server.hostname);
David Howells08734042009-04-03 16:42:42 +01002458 kfree(data->fscache_uniq);
Trond Myklebust33852a12008-06-19 14:20:11 -04002459 security_free_mnt_opts(&data->lsm_opts);
2460out_free_fh:
2461 kfree(mntfh);
2462 kfree(data);
Trond Myklebust816724e2006-06-24 08:41:41 -04002463 return error;
David Howells54ceac42006-08-22 20:06:13 -04002464
Chuck Lever29eb9812007-07-01 12:12:30 -04002465out_free:
2466 nfs_free_server(server);
2467 goto out;
2468
Eric Paris46c8ac72008-05-02 13:42:42 -07002469error_splat_root:
2470 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04002471error_splat_super:
2472 up_write(&s->s_umount);
2473 deactivate_super(s);
Chuck Lever29eb9812007-07-01 12:12:30 -04002474 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002475}
2476
2477static void nfs4_kill_super(struct super_block *sb)
2478{
2479 struct nfs_server *server = NFS_SB(sb);
2480
Trond Myklebust515d8612008-12-23 15:21:46 -05002481 nfs_super_return_all_delegations(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002482 kill_anon_super(sb);
2483
2484 nfs4_renewd_prepare_shutdown(server);
David Howells08734042009-04-03 16:42:42 +01002485 nfs_fscache_release_super_cookie(sb);
David Howells54ceac42006-08-22 20:06:13 -04002486 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002487}
2488
2489/*
David Howells54ceac42006-08-22 20:06:13 -04002490 * Clone an NFS4 server record on xdev traversal (FSID-change)
David Howellsf7b422b2006-06-09 09:34:33 -04002491 */
David Howells54ceac42006-08-22 20:06:13 -04002492static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2493 const char *dev_name, void *raw_data,
2494 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002495{
2496 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002497 struct super_block *s;
2498 struct nfs_server *server;
2499 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002500 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002501 struct nfs_sb_mountdata sb_mntdata = {
2502 .mntflags = flags,
2503 };
David Howells54ceac42006-08-22 20:06:13 -04002504 int error;
2505
2506 dprintk("--> nfs4_xdev_get_sb()\n");
2507
2508 /* create a new volume representation */
2509 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2510 if (IS_ERR(server)) {
2511 error = PTR_ERR(server);
2512 goto out_err_noserver;
2513 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002514 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002515
Trond Myklebust75180df2007-05-16 16:53:28 -04002516 if (server->flags & NFS4_MOUNT_UNSHARED)
2517 compare_super = NULL;
2518
David Howells54ceac42006-08-22 20:06:13 -04002519 /* Get a superblock - note that we may end up sharing one that already exists */
Andy Adamsonec9a05c2008-10-17 10:44:37 -04002520 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002521 if (IS_ERR(s)) {
2522 error = PTR_ERR(s);
2523 goto out_err_nosb;
2524 }
2525
2526 if (s->s_fs_info != server) {
2527 nfs_free_server(server);
2528 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002529 } else {
2530 error = nfs_bdi_register(server);
2531 if (error)
2532 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002533 }
2534
2535 if (!s->s_root) {
2536 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002537 nfs4_clone_super(s, data->sb);
2538 }
2539
2540 mntroot = nfs4_get_root(s, data->fh);
2541 if (IS_ERR(mntroot)) {
2542 error = PTR_ERR(mntroot);
2543 goto error_splat_super;
2544 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002545 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2546 dput(mntroot);
2547 error = -ESTALE;
2548 goto error_splat_super;
2549 }
David Howells54ceac42006-08-22 20:06:13 -04002550
2551 s->s_flags |= MS_ACTIVE;
2552 mnt->mnt_sb = s;
2553 mnt->mnt_root = mntroot;
2554
Eric Paris46c8ac72008-05-02 13:42:42 -07002555 security_sb_clone_mnt_opts(data->sb, s);
2556
David Howells54ceac42006-08-22 20:06:13 -04002557 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2558 return 0;
2559
2560out_err_nosb:
2561 nfs_free_server(server);
2562out_err_noserver:
2563 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2564 return error;
2565
2566error_splat_super:
2567 up_write(&s->s_umount);
2568 deactivate_super(s);
2569 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2570 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002571}
2572
David Howells54ceac42006-08-22 20:06:13 -04002573/*
2574 * Create an NFS4 server record on referral traversal
2575 */
2576static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2577 const char *dev_name, void *raw_data,
2578 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002579{
2580 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002581 struct super_block *s;
2582 struct nfs_server *server;
2583 struct dentry *mntroot;
2584 struct nfs_fh mntfh;
Trond Myklebust75180df2007-05-16 16:53:28 -04002585 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002586 struct nfs_sb_mountdata sb_mntdata = {
2587 .mntflags = flags,
2588 };
David Howells54ceac42006-08-22 20:06:13 -04002589 int error;
2590
2591 dprintk("--> nfs4_referral_get_sb()\n");
2592
2593 /* create a new volume representation */
2594 server = nfs4_create_referral_server(data, &mntfh);
2595 if (IS_ERR(server)) {
2596 error = PTR_ERR(server);
2597 goto out_err_noserver;
2598 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002599 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002600
Trond Myklebust75180df2007-05-16 16:53:28 -04002601 if (server->flags & NFS4_MOUNT_UNSHARED)
2602 compare_super = NULL;
2603
David Howells54ceac42006-08-22 20:06:13 -04002604 /* Get a superblock - note that we may end up sharing one that already exists */
Andy Adamsonec9a05c2008-10-17 10:44:37 -04002605 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002606 if (IS_ERR(s)) {
2607 error = PTR_ERR(s);
2608 goto out_err_nosb;
2609 }
2610
2611 if (s->s_fs_info != server) {
2612 nfs_free_server(server);
2613 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002614 } else {
2615 error = nfs_bdi_register(server);
2616 if (error)
2617 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002618 }
2619
2620 if (!s->s_root) {
2621 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002622 nfs4_fill_super(s);
2623 }
2624
Trond Myklebustf2d0d852007-02-02 14:46:09 -08002625 mntroot = nfs4_get_root(s, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002626 if (IS_ERR(mntroot)) {
2627 error = PTR_ERR(mntroot);
2628 goto error_splat_super;
2629 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002630 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2631 dput(mntroot);
2632 error = -ESTALE;
2633 goto error_splat_super;
2634 }
David Howells54ceac42006-08-22 20:06:13 -04002635
2636 s->s_flags |= MS_ACTIVE;
2637 mnt->mnt_sb = s;
2638 mnt->mnt_root = mntroot;
2639
Eric Paris46c8ac72008-05-02 13:42:42 -07002640 security_sb_clone_mnt_opts(data->sb, s);
2641
David Howells54ceac42006-08-22 20:06:13 -04002642 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2643 return 0;
2644
2645out_err_nosb:
2646 nfs_free_server(server);
2647out_err_noserver:
2648 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2649 return error;
2650
2651error_splat_super:
2652 up_write(&s->s_umount);
2653 deactivate_super(s);
2654 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2655 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002656}
2657
David Howells54ceac42006-08-22 20:06:13 -04002658#endif /* CONFIG_NFS_V4 */