blob: 539a61a0887bede790004e22c4a60b0522e4ae39 [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_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400518 { NFS_MOUNT_NOCTO, ",nocto", "" },
519 { NFS_MOUNT_NOAC, ",noac", "" },
520 { NFS_MOUNT_NONLM, ",nolock", "" },
521 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400522 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Chuck Leverd7403512008-12-23 15:21:37 -0500523 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
524 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400525 { 0, NULL, NULL }
526 };
David Howells509de812006-08-22 20:06:11 -0400527 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400528 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400529 u32 version = clp->rpc_ops->version;
David Howellsf7b422b2006-06-09 09:34:33 -0400530
Chuck Lever82d101d2008-03-14 14:10:37 -0400531 seq_printf(m, ",vers=%u", version);
Chuck Lever2d767432008-03-14 14:10:08 -0400532 seq_printf(m, ",rsize=%u", nfss->rsize);
533 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400534 if (nfss->bsize != 0)
535 seq_printf(m, ",bsize=%u", nfss->bsize);
536 seq_printf(m, ",namlen=%u", nfss->namelen);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400537 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400538 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400539 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400540 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400541 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400542 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400543 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400544 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400545 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
546 if (nfss->flags & nfs_infop->flag)
547 seq_puts(m, nfs_infop->str);
548 else
549 seq_puts(m, nfs_infop->nostr);
550 }
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400551 seq_printf(m, ",proto=%s",
552 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
Chuck Lever82d101d2008-03-14 14:10:37 -0400553 if (version == 4) {
554 if (nfss->port != NFS_PORT)
555 seq_printf(m, ",port=%u", nfss->port);
556 } else
557 if (nfss->port)
558 seq_printf(m, ",port=%u", nfss->port);
559
Trond Myklebust33170232007-12-20 16:03:59 -0500560 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
561 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400562 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400563
564 if (version != 4)
565 nfs_show_mountd_options(m, nfss, showdefaults);
566
567#ifdef CONFIG_NFS_V4
568 if (clp->rpc_ops->version == 4)
569 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
570#endif
David Howellsb797cac2009-04-03 16:42:48 +0100571 if (nfss->options & NFS_OPTION_FSCACHE)
572 seq_printf(m, ",fsc");
David Howellsf7b422b2006-06-09 09:34:33 -0400573}
574
575/*
576 * Describe the mount options on this VFS mountpoint
577 */
578static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
579{
580 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
581
582 nfs_show_mount_options(m, nfss, 0);
583
Chuck Lever5d8515c2007-12-10 14:57:16 -0500584 seq_printf(m, ",addr=%s",
585 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
586 RPC_DISPLAY_ADDR));
David Howellsf7b422b2006-06-09 09:34:33 -0400587
588 return 0;
589}
590
591/*
592 * Present statistical information for this VFS mountpoint
593 */
594static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
595{
596 int i, cpu;
597 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
598 struct rpc_auth *auth = nfss->client->cl_auth;
599 struct nfs_iostats totals = { };
600
601 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
602
603 /*
604 * Display all mount option settings
605 */
606 seq_printf(m, "\n\topts:\t");
607 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
608 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
611 nfs_show_mount_options(m, nfss, 1);
612
613 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
614
615 seq_printf(m, "\n\tcaps:\t");
616 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400617 seq_printf(m, ",wtmult=%u", nfss->wtmult);
618 seq_printf(m, ",dtsize=%u", nfss->dtsize);
619 seq_printf(m, ",bsize=%u", nfss->bsize);
620 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400621
622#ifdef CONFIG_NFS_V4
Trond Myklebust40c553192007-12-14 14:56:07 -0500623 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400624 seq_printf(m, "\n\tnfsv4:\t");
625 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
626 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
627 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
628 }
629#endif
630
631 /*
632 * Display security flavor in effect for this mount
633 */
Chuck Lever2d767432008-03-14 14:10:08 -0400634 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400635 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400636 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400637
638 /*
639 * Display superblock I/O counters
640 */
641 for_each_possible_cpu(cpu) {
642 struct nfs_iostats *stats;
643
644 preempt_disable();
645 stats = per_cpu_ptr(nfss->io_stats, cpu);
646
647 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
648 totals.events[i] += stats->events[i];
649 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
650 totals.bytes[i] += stats->bytes[i];
David Howells6a510912009-04-03 16:42:43 +0100651#ifdef CONFIG_NFS_FSCACHE
652 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
653 totals.fscache[i] += stats->fscache[i];
654#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400655
656 preempt_enable();
657 }
658
659 seq_printf(m, "\n\tevents:\t");
660 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
661 seq_printf(m, "%lu ", totals.events[i]);
662 seq_printf(m, "\n\tbytes:\t");
663 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
664 seq_printf(m, "%Lu ", totals.bytes[i]);
David Howells6a510912009-04-03 16:42:43 +0100665#ifdef CONFIG_NFS_FSCACHE
666 if (nfss->options & NFS_OPTION_FSCACHE) {
667 seq_printf(m, "\n\tfsc:\t");
668 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
669 seq_printf(m, "%Lu ", totals.bytes[i]);
670 }
671#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400672 seq_printf(m, "\n");
673
674 rpc_print_iostats(m, nfss->client);
675
676 return 0;
677}
678
679/*
680 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400681 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400682 */
Al Viro42faad92008-04-24 07:21:56 -0400683static void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400684{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200685 struct nfs_server *server;
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400686 struct rpc_clnt *rpc;
687
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200688 lock_kernel();
689
690 server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400691 /* -EIO all pending I/O */
692 rpc = server->client_acl;
693 if (!IS_ERR(rpc))
694 rpc_killall_tasks(rpc);
695 rpc = server->client;
696 if (!IS_ERR(rpc))
697 rpc_killall_tasks(rpc);
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200698
699 unlock_kernel();
David Howellsf7b422b2006-06-09 09:34:33 -0400700}
701
702/*
Chuck Levercdcd7f9a2007-12-10 14:57:45 -0500703 * Sanity-check a server address provided by the mount command.
704 *
705 * Address family must be initialized, and address must not be
706 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400707 */
708static int nfs_verify_server_address(struct sockaddr *addr)
709{
710 switch (addr->sa_family) {
711 case AF_INET: {
Chuck Levercdcd7f9a2007-12-10 14:57:45 -0500712 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700713 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f9a2007-12-10 14:57:45 -0500714 }
715 case AF_INET6: {
716 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
717 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -0400718 }
719 }
720
721 return 0;
722}
723
Chuck Leverce3b7e12008-06-23 12:36:53 -0400724static void nfs_parse_ipv4_address(char *string, size_t str_len,
725 struct sockaddr *sap, size_t *addr_len)
Chuck Lever9412b922007-12-10 14:59:21 -0500726{
Chuck Leverce3b7e12008-06-23 12:36:53 -0400727 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
728 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
Chuck Lever9412b922007-12-10 14:59:21 -0500729
Chuck Leverce3b7e12008-06-23 12:36:53 -0400730 if (str_len <= INET_ADDRSTRLEN) {
731 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
732 (int)str_len, string);
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500733
Chuck Leverce3b7e12008-06-23 12:36:53 -0400734 sin->sin_family = AF_INET;
735 *addr_len = sizeof(*sin);
736 if (in4_pton(string, str_len, addr, '\0', NULL))
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500737 return;
738 }
Chuck Lever9412b922007-12-10 14:59:21 -0500739
740 sap->sa_family = AF_UNSPEC;
Chuck Leverce3b7e12008-06-23 12:36:53 -0400741 *addr_len = 0;
742}
743
744#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Chuck Lever5e2e7722008-10-08 15:38:10 -0400745static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
746 const char *delim,
747 struct sockaddr_in6 *sin6)
Chuck Leverd8e77482008-06-23 12:37:01 -0400748{
749 char *p;
750 size_t len;
751
Chuck Lever5e2e7722008-10-08 15:38:10 -0400752 if ((string + str_len) == delim)
753 return 1;
754
Chuck Leverd8e77482008-06-23 12:37:01 -0400755 if (*delim != IPV6_SCOPE_DELIMITER)
Chuck Lever5e2e7722008-10-08 15:38:10 -0400756 return 0;
757
758 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
759 return 0;
Chuck Leverd8e77482008-06-23 12:37:01 -0400760
761 len = (string + str_len) - delim - 1;
762 p = kstrndup(delim + 1, len, GFP_KERNEL);
763 if (p) {
764 unsigned long scope_id = 0;
765 struct net_device *dev;
766
767 dev = dev_get_by_name(&init_net, p);
768 if (dev != NULL) {
769 scope_id = dev->ifindex;
770 dev_put(dev);
771 } else {
Chuck Lever5e2e7722008-10-08 15:38:10 -0400772 if (strict_strtoul(p, 10, &scope_id) == 0) {
773 kfree(p);
774 return 0;
775 }
Chuck Leverd8e77482008-06-23 12:37:01 -0400776 }
777
778 kfree(p);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400779
Chuck Leverd8e77482008-06-23 12:37:01 -0400780 sin6->sin6_scope_id = scope_id;
781 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400782 return 1;
Chuck Leverd8e77482008-06-23 12:37:01 -0400783 }
Chuck Lever5e2e7722008-10-08 15:38:10 -0400784
785 return 0;
Chuck Leverd8e77482008-06-23 12:37:01 -0400786}
787
Chuck Leverce3b7e12008-06-23 12:36:53 -0400788static void nfs_parse_ipv6_address(char *string, size_t str_len,
789 struct sockaddr *sap, size_t *addr_len)
790{
791 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
792 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
Chuck Leverd8e77482008-06-23 12:37:01 -0400793 const char *delim;
Chuck Leverce3b7e12008-06-23 12:36:53 -0400794
795 if (str_len <= INET6_ADDRSTRLEN) {
796 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
797 (int)str_len, string);
798
799 sin6->sin6_family = AF_INET6;
800 *addr_len = sizeof(*sin6);
Chuck Lever5e2e7722008-10-08 15:38:10 -0400801 if (in6_pton(string, str_len, addr,
802 IPV6_SCOPE_DELIMITER, &delim) != 0) {
803 if (nfs_parse_ipv6_scope_id(string, str_len,
804 delim, sin6) != 0)
805 return;
Chuck Leverd8e77482008-06-23 12:37:01 -0400806 }
Chuck Leverce3b7e12008-06-23 12:36:53 -0400807 }
808
809 sap->sa_family = AF_UNSPEC;
810 *addr_len = 0;
811}
812#else
813static void nfs_parse_ipv6_address(char *string, size_t str_len,
814 struct sockaddr *sap, size_t *addr_len)
815{
816 sap->sa_family = AF_UNSPEC;
817 *addr_len = 0;
818}
819#endif
820
821/*
822 * Construct a sockaddr based on the contents of a string that contains
823 * an IP address in presentation format.
824 *
825 * If there is a problem constructing the new sockaddr, set the address
826 * family to AF_UNSPEC.
827 */
J. Bruce Fieldsea31a442008-08-20 16:10:23 -0400828void nfs_parse_ip_address(char *string, size_t str_len,
Chuck Leverce3b7e12008-06-23 12:36:53 -0400829 struct sockaddr *sap, size_t *addr_len)
830{
831 unsigned int i, colons;
832
833 colons = 0;
834 for (i = 0; i < str_len; i++)
835 if (string[i] == ':')
836 colons++;
837
838 if (colons >= 2)
839 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
840 else
841 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
Chuck Lever9412b922007-12-10 14:59:21 -0500842}
843
844/*
Trond Myklebust259875e2008-07-02 14:43:47 -0400845 * Sanity check the NFS transport protocol.
846 *
847 */
848static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
849{
850 switch (mnt->nfs_server.protocol) {
851 case XPRT_TRANSPORT_UDP:
852 case XPRT_TRANSPORT_TCP:
853 case XPRT_TRANSPORT_RDMA:
854 break;
855 default:
856 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
857 }
858}
859
860/*
861 * For text based NFSv2/v3 mounts, the mount protocol transport default
862 * settings should depend upon the specified NFS transport.
863 */
864static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
865{
866 nfs_validate_transport_protocol(mnt);
867
868 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
869 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
870 return;
871 switch (mnt->nfs_server.protocol) {
872 case XPRT_TRANSPORT_UDP:
873 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
874 break;
875 case XPRT_TRANSPORT_TCP:
876 case XPRT_TRANSPORT_RDMA:
877 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
878 }
879}
880
881/*
Chuck Lever01060c82008-06-24 16:33:38 -0400882 * Parse the value of the 'sec=' option.
883 *
Chuck Leverdd07c942008-06-24 16:33:46 -0400884 * The flavor_len setting is for v4 mounts.
Chuck Lever01060c82008-06-24 16:33:38 -0400885 */
886static int nfs_parse_security_flavors(char *value,
887 struct nfs_parsed_mount_data *mnt)
888{
889 substring_t args[MAX_OPT_ARGS];
890
891 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
892
893 switch (match_token(value, nfs_secflavor_tokens, args)) {
894 case Opt_sec_none:
Chuck Lever01060c82008-06-24 16:33:38 -0400895 mnt->auth_flavor_len = 0;
896 mnt->auth_flavors[0] = RPC_AUTH_NULL;
897 break;
898 case Opt_sec_sys:
Chuck Lever01060c82008-06-24 16:33:38 -0400899 mnt->auth_flavor_len = 0;
900 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
901 break;
902 case Opt_sec_krb5:
Chuck Lever01060c82008-06-24 16:33:38 -0400903 mnt->auth_flavor_len = 1;
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
905 break;
906 case Opt_sec_krb5i:
Chuck Lever01060c82008-06-24 16:33:38 -0400907 mnt->auth_flavor_len = 1;
908 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
909 break;
910 case Opt_sec_krb5p:
Chuck Lever01060c82008-06-24 16:33:38 -0400911 mnt->auth_flavor_len = 1;
912 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
913 break;
914 case Opt_sec_lkey:
Chuck Lever01060c82008-06-24 16:33:38 -0400915 mnt->auth_flavor_len = 1;
916 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
917 break;
918 case Opt_sec_lkeyi:
Chuck Lever01060c82008-06-24 16:33:38 -0400919 mnt->auth_flavor_len = 1;
920 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
921 break;
922 case Opt_sec_lkeyp:
Chuck Lever01060c82008-06-24 16:33:38 -0400923 mnt->auth_flavor_len = 1;
924 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
925 break;
926 case Opt_sec_spkm:
Chuck Lever01060c82008-06-24 16:33:38 -0400927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
929 break;
930 case Opt_sec_spkmi:
Chuck Lever01060c82008-06-24 16:33:38 -0400931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
933 break;
934 case Opt_sec_spkmp:
Chuck Lever01060c82008-06-24 16:33:38 -0400935 mnt->auth_flavor_len = 1;
936 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
937 break;
938 default:
939 return 0;
940 }
941
942 return 1;
943}
944
Chuck Leverf45663c2008-06-24 19:28:02 -0400945static void nfs_parse_invalid_value(const char *option)
946{
947 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
948}
949
Chuck Lever01060c82008-06-24 16:33:38 -0400950/*
Chuck Leverbf0fd762007-07-01 12:13:44 -0400951 * Error-check and convert a string of mount options from user space into
Chuck Leverf45663c2008-06-24 19:28:02 -0400952 * a data structure. The whole mount string is processed; bad options are
953 * skipped as they are encountered. If there were no errors, return 1;
954 * otherwise return 0 (zero).
Chuck Leverbf0fd762007-07-01 12:13:44 -0400955 */
956static int nfs_parse_mount_options(char *raw,
957 struct nfs_parsed_mount_data *mnt)
958{
Eric Parisf9c3a382008-03-05 14:20:18 -0500959 char *p, *string, *secdata;
Chuck Leverf45663c2008-06-24 19:28:02 -0400960 int rc, sloppy = 0, errors = 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400961
962 if (!raw) {
963 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
964 return 1;
965 }
966 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
967
Eric Parisf9c3a382008-03-05 14:20:18 -0500968 secdata = alloc_secdata();
969 if (!secdata)
970 goto out_nomem;
971
972 rc = security_sb_copy_data(raw, secdata);
973 if (rc)
974 goto out_security_failure;
975
976 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
977 if (rc)
978 goto out_security_failure;
979
980 free_secdata(secdata);
981
Chuck Leverbf0fd762007-07-01 12:13:44 -0400982 while ((p = strsep(&raw, ",")) != NULL) {
983 substring_t args[MAX_OPT_ARGS];
984 int option, token;
985
986 if (!*p)
987 continue;
988
989 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
990
991 token = match_token(p, nfs_mount_option_tokens, args);
992 switch (token) {
Chuck Leverf45663c2008-06-24 19:28:02 -0400993
994 /*
995 * boolean options: foo/nofoo
996 */
Chuck Leverbf0fd762007-07-01 12:13:44 -0400997 case Opt_soft:
998 mnt->flags |= NFS_MOUNT_SOFT;
999 break;
1000 case Opt_hard:
1001 mnt->flags &= ~NFS_MOUNT_SOFT;
1002 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001003 case Opt_posix:
1004 mnt->flags |= NFS_MOUNT_POSIX;
1005 break;
1006 case Opt_noposix:
1007 mnt->flags &= ~NFS_MOUNT_POSIX;
1008 break;
1009 case Opt_cto:
1010 mnt->flags &= ~NFS_MOUNT_NOCTO;
1011 break;
1012 case Opt_nocto:
1013 mnt->flags |= NFS_MOUNT_NOCTO;
1014 break;
1015 case Opt_ac:
1016 mnt->flags &= ~NFS_MOUNT_NOAC;
1017 break;
1018 case Opt_noac:
1019 mnt->flags |= NFS_MOUNT_NOAC;
1020 break;
1021 case Opt_lock:
1022 mnt->flags &= ~NFS_MOUNT_NONLM;
1023 break;
1024 case Opt_nolock:
1025 mnt->flags |= NFS_MOUNT_NONLM;
1026 break;
1027 case Opt_v2:
1028 mnt->flags &= ~NFS_MOUNT_VER3;
1029 break;
1030 case Opt_v3:
1031 mnt->flags |= NFS_MOUNT_VER3;
1032 break;
1033 case Opt_udp:
1034 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001035 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001036 break;
1037 case Opt_tcp:
1038 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001039 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001040 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001041 case Opt_rdma:
1042 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1043 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001044 xprt_load_transport(p);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001045 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001046 case Opt_acl:
1047 mnt->flags &= ~NFS_MOUNT_NOACL;
1048 break;
1049 case Opt_noacl:
1050 mnt->flags |= NFS_MOUNT_NOACL;
1051 break;
1052 case Opt_rdirplus:
1053 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1054 break;
1055 case Opt_nordirplus:
1056 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1057 break;
Trond Myklebust75180df2007-05-16 16:53:28 -04001058 case Opt_sharecache:
1059 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1060 break;
1061 case Opt_nosharecache:
1062 mnt->flags |= NFS_MOUNT_UNSHARED;
1063 break;
Chuck Leverd7403512008-12-23 15:21:37 -05001064 case Opt_resvport:
1065 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1066 break;
1067 case Opt_noresvport:
1068 mnt->flags |= NFS_MOUNT_NORESVPORT;
1069 break;
David Howellsb797cac2009-04-03 16:42:48 +01001070 case Opt_fscache:
1071 mnt->options |= NFS_OPTION_FSCACHE;
1072 kfree(mnt->fscache_uniq);
1073 mnt->fscache_uniq = NULL;
1074 break;
1075 case Opt_nofscache:
1076 mnt->options &= ~NFS_OPTION_FSCACHE;
1077 kfree(mnt->fscache_uniq);
1078 mnt->fscache_uniq = NULL;
1079 break;
1080 case Opt_fscache_uniq:
1081 string = match_strdup(args);
1082 if (!string)
1083 goto out_nomem;
1084 kfree(mnt->fscache_uniq);
1085 mnt->fscache_uniq = string;
1086 mnt->options |= NFS_OPTION_FSCACHE;
1087 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001088
Chuck Leverf45663c2008-06-24 19:28:02 -04001089 /*
1090 * options that take numeric values
1091 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001092 case Opt_port:
Chuck Leverf45663c2008-06-24 19:28:02 -04001093 if (match_int(args, &option) ||
1094 option < 0 || option > USHORT_MAX) {
1095 errors++;
1096 nfs_parse_invalid_value("port");
1097 } else
1098 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001099 break;
1100 case Opt_rsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001101 if (match_int(args, &option) || option < 0) {
1102 errors++;
1103 nfs_parse_invalid_value("rsize");
1104 } else
1105 mnt->rsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001106 break;
1107 case Opt_wsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001108 if (match_int(args, &option) || option < 0) {
1109 errors++;
1110 nfs_parse_invalid_value("wsize");
1111 } else
1112 mnt->wsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001113 break;
1114 case Opt_bsize:
Chuck Leverf45663c2008-06-24 19:28:02 -04001115 if (match_int(args, &option) || option < 0) {
1116 errors++;
1117 nfs_parse_invalid_value("bsize");
1118 } else
1119 mnt->bsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001120 break;
1121 case Opt_timeo:
Chuck Leverf45663c2008-06-24 19:28:02 -04001122 if (match_int(args, &option) || option <= 0) {
1123 errors++;
1124 nfs_parse_invalid_value("timeo");
1125 } else
1126 mnt->timeo = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001127 break;
1128 case Opt_retrans:
Chuck Leverf45663c2008-06-24 19:28:02 -04001129 if (match_int(args, &option) || option <= 0) {
1130 errors++;
1131 nfs_parse_invalid_value("retrans");
1132 } else
1133 mnt->retrans = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001134 break;
1135 case Opt_acregmin:
Chuck Leverf45663c2008-06-24 19:28:02 -04001136 if (match_int(args, &option) || option < 0) {
1137 errors++;
1138 nfs_parse_invalid_value("acregmin");
1139 } else
1140 mnt->acregmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001141 break;
1142 case Opt_acregmax:
Chuck Leverf45663c2008-06-24 19:28:02 -04001143 if (match_int(args, &option) || option < 0) {
1144 errors++;
1145 nfs_parse_invalid_value("acregmax");
1146 } else
1147 mnt->acregmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001148 break;
1149 case Opt_acdirmin:
Chuck Leverf45663c2008-06-24 19:28:02 -04001150 if (match_int(args, &option) || option < 0) {
1151 errors++;
1152 nfs_parse_invalid_value("acdirmin");
1153 } else
1154 mnt->acdirmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001155 break;
1156 case Opt_acdirmax:
Chuck Leverf45663c2008-06-24 19:28:02 -04001157 if (match_int(args, &option) || option < 0) {
1158 errors++;
1159 nfs_parse_invalid_value("acdirmax");
1160 } else
1161 mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001162 break;
1163 case Opt_actimeo:
Chuck Leverf45663c2008-06-24 19:28:02 -04001164 if (match_int(args, &option) || option < 0) {
1165 errors++;
1166 nfs_parse_invalid_value("actimeo");
1167 } else
1168 mnt->acregmin = mnt->acregmax =
1169 mnt->acdirmin = mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001170 break;
1171 case Opt_namelen:
Chuck Leverf45663c2008-06-24 19:28:02 -04001172 if (match_int(args, &option) || option < 0) {
1173 errors++;
1174 nfs_parse_invalid_value("namlen");
1175 } else
1176 mnt->namlen = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001177 break;
1178 case Opt_mountport:
Chuck Leverf45663c2008-06-24 19:28:02 -04001179 if (match_int(args, &option) ||
1180 option < 0 || option > USHORT_MAX) {
1181 errors++;
1182 nfs_parse_invalid_value("mountport");
1183 } else
1184 mnt->mount_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001185 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001186 case Opt_mountvers:
Chuck Leverf45663c2008-06-24 19:28:02 -04001187 if (match_int(args, &option) ||
1188 option < NFS_MNT_VERSION ||
1189 option > NFS_MNT3_VERSION) {
1190 errors++;
1191 nfs_parse_invalid_value("mountvers");
1192 } else
1193 mnt->mount_server.version = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001194 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001195 case Opt_nfsvers:
Chuck Leverf45663c2008-06-24 19:28:02 -04001196 if (match_int(args, &option)) {
1197 errors++;
1198 nfs_parse_invalid_value("nfsvers");
1199 break;
1200 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001201 switch (option) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001202 case NFS2_VERSION:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001203 mnt->flags &= ~NFS_MOUNT_VER3;
1204 break;
Chuck Leverf45663c2008-06-24 19:28:02 -04001205 case NFS3_VERSION:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001206 mnt->flags |= NFS_MOUNT_VER3;
1207 break;
1208 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001209 errors++;
1210 nfs_parse_invalid_value("nfsvers");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001211 }
1212 break;
1213
Chuck Leverf45663c2008-06-24 19:28:02 -04001214 /*
1215 * options that take text values
1216 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001217 case Opt_sec:
1218 string = match_strdup(args);
1219 if (string == NULL)
1220 goto out_nomem;
Chuck Lever01060c82008-06-24 16:33:38 -04001221 rc = nfs_parse_security_flavors(string, mnt);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001222 kfree(string);
Chuck Leverf45663c2008-06-24 19:28:02 -04001223 if (!rc) {
1224 errors++;
1225 dfprintk(MOUNT, "NFS: unrecognized "
1226 "security flavor\n");
1227 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001228 break;
1229 case Opt_proto:
1230 string = match_strdup(args);
1231 if (string == NULL)
1232 goto out_nomem;
1233 token = match_token(string,
1234 nfs_xprt_protocol_tokens, args);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001235
1236 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001237 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001238 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001239 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001240 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001241 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001242 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001243 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001244 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001245 case Opt_xprt_rdma:
1246 /* vector side protocols to TCP */
1247 mnt->flags |= NFS_MOUNT_TCP;
1248 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001249 xprt_load_transport(string);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001250 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001251 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001252 errors++;
1253 dfprintk(MOUNT, "NFS: unrecognized "
1254 "transport protocol\n");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001255 }
Tom Talpeya67d18f2009-03-11 14:37:56 -04001256 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001257 break;
1258 case Opt_mountproto:
1259 string = match_strdup(args);
1260 if (string == NULL)
1261 goto out_nomem;
1262 token = match_token(string,
1263 nfs_xprt_protocol_tokens, args);
Trond Myklebustd508afb2009-04-06 16:41:35 -07001264 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001265
1266 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001267 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001268 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001269 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001270 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001271 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001272 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001273 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001274 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001275 errors++;
1276 dfprintk(MOUNT, "NFS: unrecognized "
1277 "transport protocol\n");
Chuck Leverbf0fd762007-07-01 12:13:44 -04001278 }
1279 break;
1280 case Opt_addr:
1281 string = match_strdup(args);
1282 if (string == NULL)
1283 goto out_nomem;
Chuck Leverce3b7e12008-06-23 12:36:53 -04001284 nfs_parse_ip_address(string, strlen(string),
1285 (struct sockaddr *)
1286 &mnt->nfs_server.address,
1287 &mnt->nfs_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001288 kfree(string);
1289 break;
1290 case Opt_clientaddr:
1291 string = match_strdup(args);
1292 if (string == NULL)
1293 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001294 kfree(mnt->client_address);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001295 mnt->client_address = string;
1296 break;
Chuck Lever33832032007-12-10 14:59:13 -05001297 case Opt_mounthost:
1298 string = match_strdup(args);
1299 if (string == NULL)
1300 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001301 kfree(mnt->mount_server.hostname);
Chuck Lever33832032007-12-10 14:59:13 -05001302 mnt->mount_server.hostname = string;
1303 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001304 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001305 string = match_strdup(args);
1306 if (string == NULL)
1307 goto out_nomem;
Chuck Leverce3b7e12008-06-23 12:36:53 -04001308 nfs_parse_ip_address(string, strlen(string),
1309 (struct sockaddr *)
1310 &mnt->mount_server.address,
1311 &mnt->mount_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001312 kfree(string);
1313 break;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001314 case Opt_lookupcache:
1315 string = match_strdup(args);
1316 if (string == NULL)
1317 goto out_nomem;
1318 token = match_token(string,
1319 nfs_lookupcache_tokens, args);
1320 kfree(string);
1321 switch (token) {
1322 case Opt_lookupcache_all:
1323 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1324 break;
1325 case Opt_lookupcache_positive:
1326 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1327 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1328 break;
1329 case Opt_lookupcache_none:
1330 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1331 break;
1332 default:
1333 errors++;
1334 dfprintk(MOUNT, "NFS: invalid "
1335 "lookupcache argument\n");
1336 };
1337 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001338
Chuck Leverf45663c2008-06-24 19:28:02 -04001339 /*
1340 * Special options
1341 */
1342 case Opt_sloppy:
1343 sloppy = 1;
1344 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1345 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001346 case Opt_userspace:
1347 case Opt_deprecated:
Chuck Leverd33e4df2008-06-12 12:37:41 -04001348 dfprintk(MOUNT, "NFS: ignoring mount option "
1349 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001350 break;
1351
1352 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001353 errors++;
1354 dfprintk(MOUNT, "NFS: unrecognized mount option "
1355 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001356 }
1357 }
1358
Chuck Leveraf904de2008-09-08 11:58:13 -04001359 if (errors > 0) {
1360 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1361 errors, (errors == 1 ? "" : "s"));
1362 if (!sloppy)
1363 return 0;
1364 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001365 return 1;
1366
1367out_nomem:
1368 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1369 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001370out_security_failure:
1371 free_secdata(secdata);
1372 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1373 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001374}
1375
1376/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001377 * Use the remote server's MOUNT service to request the NFS file handle
1378 * corresponding to the provided path.
1379 */
1380static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1381 struct nfs_fh *root_fh)
1382{
Chuck Leverc5d120f2008-12-23 15:21:35 -05001383 struct nfs_mount_request request = {
1384 .sap = (struct sockaddr *)
1385 &args->mount_server.address,
1386 .dirpath = args->nfs_server.export_path,
1387 .protocol = args->mount_server.protocol,
1388 .fh = root_fh,
Chuck Lever50a737f2008-12-23 15:21:37 -05001389 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
Chuck Leverc5d120f2008-12-23 15:21:35 -05001390 };
Chuck Lever4c568012007-12-10 14:59:28 -05001391 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001392
1393 if (args->mount_server.version == 0) {
1394 if (args->flags & NFS_MOUNT_VER3)
1395 args->mount_server.version = NFS_MNT3_VERSION;
1396 else
1397 args->mount_server.version = NFS_MNT_VERSION;
1398 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001399 request.version = args->mount_server.version;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001400
Chuck Lever33832032007-12-10 14:59:13 -05001401 if (args->mount_server.hostname)
Chuck Leverc5d120f2008-12-23 15:21:35 -05001402 request.hostname = args->mount_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001403 else
Chuck Leverc5d120f2008-12-23 15:21:35 -05001404 request.hostname = args->nfs_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001405
Chuck Lever0076d7b2007-07-01 12:13:49 -04001406 /*
1407 * Construct the mount server's address.
1408 */
Chuck Lever4c568012007-12-10 14:59:28 -05001409 if (args->mount_server.address.ss_family == AF_UNSPEC) {
Chuck Leverc5d120f2008-12-23 15:21:35 -05001410 memcpy(request.sap, &args->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -05001411 args->nfs_server.addrlen);
1412 args->mount_server.addrlen = args->nfs_server.addrlen;
1413 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001414 request.salen = args->mount_server.addrlen;
Chuck Lever4c568012007-12-10 14:59:28 -05001415
James Lentiniaad70002007-09-24 17:32:49 -04001416 /*
1417 * autobind will be used if mount_server.port == 0
1418 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001419 nfs_set_port(request.sap, args->mount_server.port);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001420
1421 /*
1422 * Now ask the mount server to map our export path
1423 * to a file handle.
1424 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001425 status = nfs_mount(&request);
Chuck Leverefd83402007-09-11 18:00:58 -04001426 if (status == 0)
1427 return 0;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001428
Chuck Lever396cee92008-06-12 12:37:49 -04001429 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
Chuck Leverc5d120f2008-12-23 15:21:35 -05001430 request.hostname, status);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001431 return status;
1432}
1433
Chuck Leverd1aa0822008-06-23 12:36:45 -04001434static int nfs_parse_simple_hostname(const char *dev_name,
1435 char **hostname, size_t maxnamlen,
1436 char **export_path, size_t maxpathlen)
Chuck Leverdc045892008-06-23 12:36:37 -04001437{
1438 size_t len;
1439 char *colon, *comma;
1440
1441 colon = strchr(dev_name, ':');
1442 if (colon == NULL)
1443 goto out_bad_devname;
1444
1445 len = colon - dev_name;
1446 if (len > maxnamlen)
1447 goto out_hostname;
1448
1449 /* N.B. caller will free nfs_server.hostname in all cases */
1450 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1451 if (!*hostname)
1452 goto out_nomem;
1453
1454 /* kill possible hostname list: not supported */
1455 comma = strchr(*hostname, ',');
1456 if (comma != NULL) {
1457 if (comma == *hostname)
1458 goto out_bad_devname;
1459 *comma = '\0';
1460 }
1461
1462 colon++;
1463 len = strlen(colon);
1464 if (len > maxpathlen)
1465 goto out_path;
1466 *export_path = kstrndup(colon, len, GFP_KERNEL);
1467 if (!*export_path)
1468 goto out_nomem;
1469
1470 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1471 return 0;
1472
1473out_bad_devname:
1474 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1475 return -EINVAL;
1476
1477out_nomem:
1478 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1479 return -ENOMEM;
1480
1481out_hostname:
1482 dfprintk(MOUNT, "NFS: server hostname too long\n");
1483 return -ENAMETOOLONG;
1484
1485out_path:
1486 dfprintk(MOUNT, "NFS: export pathname too long\n");
1487 return -ENAMETOOLONG;
1488}
1489
1490/*
Chuck Leverd1aa0822008-06-23 12:36:45 -04001491 * Hostname has square brackets around it because it contains one or
1492 * more colons. We look for the first closing square bracket, and a
1493 * colon must follow it.
1494 */
1495static int nfs_parse_protected_hostname(const char *dev_name,
1496 char **hostname, size_t maxnamlen,
1497 char **export_path, size_t maxpathlen)
1498{
1499 size_t len;
1500 char *start, *end;
1501
1502 start = (char *)(dev_name + 1);
1503
1504 end = strchr(start, ']');
1505 if (end == NULL)
1506 goto out_bad_devname;
1507 if (*(end + 1) != ':')
1508 goto out_bad_devname;
1509
1510 len = end - start;
1511 if (len > maxnamlen)
1512 goto out_hostname;
1513
1514 /* N.B. caller will free nfs_server.hostname in all cases */
1515 *hostname = kstrndup(start, len, GFP_KERNEL);
1516 if (*hostname == NULL)
1517 goto out_nomem;
1518
1519 end += 2;
1520 len = strlen(end);
1521 if (len > maxpathlen)
1522 goto out_path;
1523 *export_path = kstrndup(end, len, GFP_KERNEL);
1524 if (!*export_path)
1525 goto out_nomem;
1526
1527 return 0;
1528
1529out_bad_devname:
1530 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1531 return -EINVAL;
1532
1533out_nomem:
1534 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1535 return -ENOMEM;
1536
1537out_hostname:
1538 dfprintk(MOUNT, "NFS: server hostname too long\n");
1539 return -ENAMETOOLONG;
1540
1541out_path:
1542 dfprintk(MOUNT, "NFS: export pathname too long\n");
1543 return -ENAMETOOLONG;
1544}
1545
1546/*
1547 * Split "dev_name" into "hostname:export_path".
1548 *
1549 * The leftmost colon demarks the split between the server's hostname
1550 * and the export path. If the hostname starts with a left square
1551 * bracket, then it may contain colons.
1552 *
1553 * Note: caller frees hostname and export path, even on error.
1554 */
1555static int nfs_parse_devname(const char *dev_name,
1556 char **hostname, size_t maxnamlen,
1557 char **export_path, size_t maxpathlen)
1558{
1559 if (*dev_name == '[')
1560 return nfs_parse_protected_hostname(dev_name,
1561 hostname, maxnamlen,
1562 export_path, maxpathlen);
1563
1564 return nfs_parse_simple_hostname(dev_name,
1565 hostname, maxnamlen,
1566 export_path, maxpathlen);
1567}
1568
1569/*
David Howells54ceac42006-08-22 20:06:13 -04001570 * Validate the NFS2/NFS3 mount data
1571 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001572 *
1573 * For option strings, user space handles the following behaviors:
1574 *
1575 * + DNS: mapping server host name to IP address ("addr=" option)
1576 *
1577 * + failure mode: how to behave if a mount request can't be handled
1578 * immediately ("fg/bg" option)
1579 *
1580 * + retry: how often to retry a mount request ("retry=" option)
1581 *
1582 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1583 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001584 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001585static int nfs_validate_mount_data(void *options,
1586 struct nfs_parsed_mount_data *args,
Chuck Lever136d5582007-07-01 12:13:54 -04001587 struct nfs_fh *mntfh,
1588 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001589{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001590 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever136d5582007-07-01 12:13:54 -04001591
Chuck Lever5df36e72007-07-01 12:12:56 -04001592 if (data == NULL)
1593 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001594
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001595 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1596 args->rsize = NFS_MAX_FILE_IO_SIZE;
1597 args->wsize = NFS_MAX_FILE_IO_SIZE;
Chuck Lever0e0cab72008-06-26 17:47:12 -04001598 args->acregmin = NFS_DEF_ACREGMIN;
1599 args->acregmax = NFS_DEF_ACREGMAX;
1600 args->acdirmin = NFS_DEF_ACDIRMIN;
1601 args->acdirmax = NFS_DEF_ACDIRMAX;
Chuck Leverf22d6d72008-03-14 14:10:22 -04001602 args->mount_server.port = 0; /* autobind unless user sets port */
Chuck Leverf22d6d72008-03-14 14:10:22 -04001603 args->nfs_server.port = 0; /* autobind unless user sets port */
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001604 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverdd07c942008-06-24 16:33:46 -04001605 args->auth_flavors[0] = RPC_AUTH_UNIX;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001606
David Howellsf7b422b2006-06-09 09:34:33 -04001607 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001608 case 1:
1609 data->namlen = 0;
1610 case 2:
1611 data->bsize = 0;
1612 case 3:
1613 if (data->flags & NFS_MOUNT_VER3)
1614 goto out_no_v3;
1615 data->root.size = NFS2_FHSIZE;
1616 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1617 case 4:
1618 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1619 goto out_no_sec;
1620 case 5:
1621 memset(data->context, 0, sizeof(data->context));
1622 case 6:
Trond Myklebustb7e24452008-06-19 15:21:11 -04001623 if (data->flags & NFS_MOUNT_VER3) {
1624 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1625 goto out_invalid_fh;
Chuck Lever5df36e72007-07-01 12:12:56 -04001626 mntfh->size = data->root.size;
Trond Myklebustb7e24452008-06-19 15:21:11 -04001627 } else
Chuck Lever5df36e72007-07-01 12:12:56 -04001628 mntfh->size = NFS2_FHSIZE;
1629
Chuck Lever5df36e72007-07-01 12:12:56 -04001630
1631 memcpy(mntfh->data, data->root.data, mntfh->size);
1632 if (mntfh->size < sizeof(mntfh->data))
1633 memset(mntfh->data + mntfh->size, 0,
1634 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001635
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001636 /*
1637 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1638 * can deal with.
1639 */
Trond Myklebustff3525a2008-08-15 16:59:14 -04001640 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001641 args->rsize = data->rsize;
1642 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001643 args->timeo = data->timeo;
1644 args->retrans = data->retrans;
1645 args->acregmin = data->acregmin;
1646 args->acregmax = data->acregmax;
1647 args->acdirmin = data->acdirmin;
1648 args->acdirmax = data->acdirmax;
Chuck Lever4c568012007-12-10 14:59:28 -05001649
1650 memcpy(&args->nfs_server.address, &data->addr,
1651 sizeof(data->addr));
1652 args->nfs_server.addrlen = sizeof(data->addr);
1653 if (!nfs_verify_server_address((struct sockaddr *)
1654 &args->nfs_server.address))
1655 goto out_no_address;
1656
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001657 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001658 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001659 /* N.B. caller will free nfs_server.hostname in all cases */
1660 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1661 args->namlen = data->namlen;
1662 args->bsize = data->bsize;
Chuck Leverdd07c942008-06-24 16:33:46 -04001663
1664 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1665 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001666 if (!args->nfs_server.hostname)
1667 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001668
1669 /*
1670 * The legacy version 6 binary mount data from userspace has a
1671 * field used only to transport selinux information into the
1672 * the kernel. To continue to support that functionality we
1673 * have a touch of selinux knowledge here in the NFS code. The
1674 * userspace code converted context=blah to just blah so we are
1675 * converting back to the full string selinux understands.
1676 */
1677 if (data->context[0]){
1678#ifdef CONFIG_SECURITY_SELINUX
1679 int rc;
1680 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1681 if (!opts_str)
1682 return -ENOMEM;
1683 strcpy(opts_str, "context=");
1684 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1685 strcat(opts_str, &data->context[0]);
1686 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1687 kfree(opts_str);
1688 if (rc)
1689 return rc;
1690#else
1691 return -EINVAL;
1692#endif
1693 }
1694
Chuck Lever5df36e72007-07-01 12:12:56 -04001695 break;
Chuck Lever136d5582007-07-01 12:13:54 -04001696 default: {
Chuck Lever136d5582007-07-01 12:13:54 -04001697 int status;
Chuck Lever136d5582007-07-01 12:13:54 -04001698
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001699 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever136d5582007-07-01 12:13:54 -04001700 return -EINVAL;
1701
Chuck Lever6e88e062007-09-24 15:39:50 -04001702 if (!nfs_verify_server_address((struct sockaddr *)
1703 &args->nfs_server.address))
1704 goto out_no_address;
1705
Chuck Levered596a82008-06-26 17:47:05 -04001706 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1707 args->nfs_server.port);
1708
Trond Myklebust259875e2008-07-02 14:43:47 -04001709 nfs_set_mount_transport_protocol(args);
1710
Chuck Leverdc045892008-06-23 12:36:37 -04001711 status = nfs_parse_devname(dev_name,
1712 &args->nfs_server.hostname,
1713 PAGE_SIZE,
1714 &args->nfs_server.export_path,
1715 NFS_MAXPATHLEN);
1716 if (!status)
1717 status = nfs_try_mount(args, mntfh);
Chuck Lever136d5582007-07-01 12:13:54 -04001718
Chuck Leverdc045892008-06-23 12:36:37 -04001719 kfree(args->nfs_server.export_path);
1720 args->nfs_server.export_path = NULL;
Chuck Lever136d5582007-07-01 12:13:54 -04001721
Chuck Lever136d5582007-07-01 12:13:54 -04001722 if (status)
Chuck Leverfdc6e2c2007-08-29 17:58:59 -04001723 return status;
Chuck Lever136d5582007-07-01 12:13:54 -04001724
Chuck Lever136d5582007-07-01 12:13:54 -04001725 break;
1726 }
David Howellsf7b422b2006-06-09 09:34:33 -04001727 }
David Howells54ceac42006-08-22 20:06:13 -04001728
David Howellsf7b422b2006-06-09 09:34:33 -04001729#ifndef CONFIG_NFS_V3
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001730 if (args->flags & NFS_MOUNT_VER3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001731 goto out_v3_not_compiled;
1732#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001733
David Howells54ceac42006-08-22 20:06:13 -04001734 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04001735
1736out_no_data:
1737 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1738 return -EINVAL;
1739
1740out_no_v3:
1741 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1742 data->version);
1743 return -EINVAL;
1744
1745out_no_sec:
1746 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1747 return -EINVAL;
1748
Chuck Lever5df36e72007-07-01 12:12:56 -04001749#ifndef CONFIG_NFS_V3
1750out_v3_not_compiled:
1751 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1752 return -EPROTONOSUPPORT;
1753#endif /* !CONFIG_NFS_V3 */
1754
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001755out_nomem:
1756 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1757 return -ENOMEM;
1758
Chuck Lever5df36e72007-07-01 12:12:56 -04001759out_no_address:
1760 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1761 return -EINVAL;
1762
1763out_invalid_fh:
1764 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1765 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04001766}
1767
Jeff Layton48b605f2008-06-10 15:38:39 -04001768static int
1769nfs_compare_remount_data(struct nfs_server *nfss,
1770 struct nfs_parsed_mount_data *data)
1771{
1772 if (data->flags != nfss->flags ||
1773 data->rsize != nfss->rsize ||
1774 data->wsize != nfss->wsize ||
1775 data->retrans != nfss->client->cl_timeout->to_retries ||
1776 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1777 data->acregmin != nfss->acregmin / HZ ||
1778 data->acregmax != nfss->acregmax / HZ ||
1779 data->acdirmin != nfss->acdirmin / HZ ||
1780 data->acdirmax != nfss->acdirmax / HZ ||
1781 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1782 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1783 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1784 data->nfs_server.addrlen) != 0)
1785 return -EINVAL;
1786
1787 return 0;
1788}
1789
1790static int
1791nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1792{
1793 int error;
1794 struct nfs_server *nfss = sb->s_fs_info;
1795 struct nfs_parsed_mount_data *data;
1796 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1797 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
Trond Myklebustcd100722008-06-17 16:12:00 -04001798 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
Jeff Layton48b605f2008-06-10 15:38:39 -04001799
1800 /*
1801 * Userspace mount programs that send binary options generally send
1802 * them populated with default values. We have no way to know which
1803 * ones were explicitly specified. Fall back to legacy behavior and
1804 * just return success.
1805 */
Marc Zyngier31c94462008-07-17 13:21:55 +02001806 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1807 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1808 options->version <= 6))))
Jeff Layton48b605f2008-06-10 15:38:39 -04001809 return 0;
1810
1811 data = kzalloc(sizeof(*data), GFP_KERNEL);
1812 if (data == NULL)
1813 return -ENOMEM;
1814
Alessio Igor Bogani337eb002009-05-12 15:10:54 +02001815 lock_kernel();
Jeff Layton48b605f2008-06-10 15:38:39 -04001816 /* 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);
Alessio Igor Bogani337eb002009-05-12 15:10:54 +02001840 unlock_kernel();
Jeff Layton48b605f2008-06-10 15:38:39 -04001841 return error;
1842}
1843
David Howells54ceac42006-08-22 20:06:13 -04001844/*
1845 * Initialise the common bits of the superblock
1846 */
1847static inline void nfs_initialise_sb(struct super_block *sb)
1848{
1849 struct nfs_server *server = NFS_SB(sb);
1850
1851 sb->s_magic = NFS_SUPER_MAGIC;
1852
1853 /* We probably want something more informative here */
1854 snprintf(sb->s_id, sizeof(sb->s_id),
1855 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1856
1857 if (sb->s_blocksize == 0)
1858 sb->s_blocksize = nfs_block_bits(server->wsize,
1859 &sb->s_blocksize_bits);
1860
1861 if (server->flags & NFS_MOUNT_NOAC)
1862 sb->s_flags |= MS_SYNCHRONOUS;
1863
1864 nfs_super_set_maxbytes(sb, server->maxfilesize);
1865}
1866
1867/*
1868 * Finish setting up an NFS2/3 superblock
1869 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001870static void nfs_fill_super(struct super_block *sb,
1871 struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -04001872{
1873 struct nfs_server *server = NFS_SB(sb);
1874
1875 sb->s_blocksize_bits = 0;
1876 sb->s_blocksize = 0;
1877 if (data->bsize)
1878 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1879
1880 if (server->flags & NFS_MOUNT_VER3) {
1881 /* The VFS shouldn't apply the umask to mode bits. We will do
1882 * so ourselves when necessary.
1883 */
1884 sb->s_flags |= MS_POSIXACL;
1885 sb->s_time_gran = 1;
1886 }
1887
1888 sb->s_op = &nfs_sops;
1889 nfs_initialise_sb(sb);
1890}
1891
1892/*
1893 * Finish setting up a cloned NFS2/3 superblock
1894 */
1895static void nfs_clone_super(struct super_block *sb,
1896 const struct super_block *old_sb)
1897{
1898 struct nfs_server *server = NFS_SB(sb);
1899
1900 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1901 sb->s_blocksize = old_sb->s_blocksize;
1902 sb->s_maxbytes = old_sb->s_maxbytes;
1903
1904 if (server->flags & NFS_MOUNT_VER3) {
1905 /* The VFS shouldn't apply the umask to mode bits. We will do
1906 * so ourselves when necessary.
1907 */
1908 sb->s_flags |= MS_POSIXACL;
1909 sb->s_time_gran = 1;
1910 }
1911
1912 sb->s_op = old_sb->s_op;
1913 nfs_initialise_sb(sb);
1914}
1915
Trond Myklebust275a5d22007-05-16 16:53:28 -04001916static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1917{
1918 const struct nfs_server *a = s->s_fs_info;
1919 const struct rpc_clnt *clnt_a = a->client;
1920 const struct rpc_clnt *clnt_b = b->client;
1921
1922 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1923 goto Ebusy;
1924 if (a->nfs_client != b->nfs_client)
1925 goto Ebusy;
1926 if (a->flags != b->flags)
1927 goto Ebusy;
1928 if (a->wsize != b->wsize)
1929 goto Ebusy;
1930 if (a->rsize != b->rsize)
1931 goto Ebusy;
1932 if (a->acregmin != b->acregmin)
1933 goto Ebusy;
1934 if (a->acregmax != b->acregmax)
1935 goto Ebusy;
1936 if (a->acdirmin != b->acdirmin)
1937 goto Ebusy;
1938 if (a->acdirmax != b->acdirmax)
1939 goto Ebusy;
1940 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1941 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001942 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04001943Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001944 return 0;
1945}
1946
1947struct nfs_sb_mountdata {
1948 struct nfs_server *server;
1949 int mntflags;
1950};
1951
1952static int nfs_set_super(struct super_block *s, void *data)
1953{
1954 struct nfs_sb_mountdata *sb_mntdata = data;
1955 struct nfs_server *server = sb_mntdata->server;
1956 int ret;
1957
1958 s->s_flags = sb_mntdata->mntflags;
1959 s->s_fs_info = server;
1960 ret = set_anon_super(s, server);
1961 if (ret == 0)
1962 server->s_dev = s->s_dev;
1963 return ret;
1964}
1965
Chuck Leverfd00a8f2007-12-10 14:57:38 -05001966static int nfs_compare_super_address(struct nfs_server *server1,
1967 struct nfs_server *server2)
1968{
1969 struct sockaddr *sap1, *sap2;
1970
1971 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1972 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1973
1974 if (sap1->sa_family != sap2->sa_family)
1975 return 0;
1976
1977 switch (sap1->sa_family) {
1978 case AF_INET: {
1979 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1980 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1981 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1982 return 0;
1983 if (sin1->sin_port != sin2->sin_port)
1984 return 0;
1985 break;
1986 }
1987 case AF_INET6: {
1988 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1989 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1990 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1991 return 0;
1992 if (sin1->sin6_port != sin2->sin6_port)
1993 return 0;
1994 break;
1995 }
1996 default:
1997 return 0;
1998 }
1999
2000 return 1;
2001}
2002
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002003static int nfs_compare_super(struct super_block *sb, void *data)
2004{
2005 struct nfs_sb_mountdata *sb_mntdata = data;
2006 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2007 int mntflags = sb_mntdata->mntflags;
2008
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002009 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002010 return 0;
2011 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2012 if (old->flags & NFS_MOUNT_UNSHARED)
2013 return 0;
2014 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2015 return 0;
2016 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04002017}
2018
Miklos Szeredifa799752008-04-30 00:54:33 -07002019static int nfs_bdi_register(struct nfs_server *server)
2020{
2021 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2022}
2023
David Howells54ceac42006-08-22 20:06:13 -04002024static int nfs_get_sb(struct file_system_type *fs_type,
2025 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2026{
2027 struct nfs_server *server = NULL;
2028 struct super_block *s;
Trond Myklebust33852a12008-06-19 14:20:11 -04002029 struct nfs_parsed_mount_data *data;
2030 struct nfs_fh *mntfh;
David Howells54ceac42006-08-22 20:06:13 -04002031 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002032 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002033 struct nfs_sb_mountdata sb_mntdata = {
2034 .mntflags = flags,
2035 };
Trond Myklebust33852a12008-06-19 14:20:11 -04002036 int error = -ENOMEM;
David Howells54ceac42006-08-22 20:06:13 -04002037
Trond Myklebust33852a12008-06-19 14:20:11 -04002038 data = kzalloc(sizeof(*data), GFP_KERNEL);
2039 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2040 if (data == NULL || mntfh == NULL)
2041 goto out_free_fh;
2042
2043 security_init_mnt_opts(&data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002044
David Howells54ceac42006-08-22 20:06:13 -04002045 /* Validate the mount data */
Trond Myklebust33852a12008-06-19 14:20:11 -04002046 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
David Howells54ceac42006-08-22 20:06:13 -04002047 if (error < 0)
Chuck Lever06559602007-07-01 12:12:35 -04002048 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002049
2050 /* Get a volume representation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002051 server = nfs_create_server(data, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002052 if (IS_ERR(server)) {
2053 error = PTR_ERR(server);
Chuck Lever06559602007-07-01 12:12:35 -04002054 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002055 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002056 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002057
Trond Myklebust75180df2007-05-16 16:53:28 -04002058 if (server->flags & NFS_MOUNT_UNSHARED)
2059 compare_super = NULL;
2060
David Howells54ceac42006-08-22 20:06:13 -04002061 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002062 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002063 if (IS_ERR(s)) {
2064 error = PTR_ERR(s);
David Howells54ceac42006-08-22 20:06:13 -04002065 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04002066 }
2067
David Howells54ceac42006-08-22 20:06:13 -04002068 if (s->s_fs_info != server) {
2069 nfs_free_server(server);
2070 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002071 } else {
2072 error = nfs_bdi_register(server);
2073 if (error)
2074 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04002075 }
David Howells54ceac42006-08-22 20:06:13 -04002076
2077 if (!s->s_root) {
2078 /* initial superblock/root creation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002079 nfs_fill_super(s, data);
David Howells08734042009-04-03 16:42:42 +01002080 nfs_fscache_get_super_cookie(s, data);
David Howells54ceac42006-08-22 20:06:13 -04002081 }
2082
Trond Myklebust33852a12008-06-19 14:20:11 -04002083 mntroot = nfs_get_root(s, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002084 if (IS_ERR(mntroot)) {
2085 error = PTR_ERR(mntroot);
2086 goto error_splat_super;
2087 }
2088
Trond Myklebust33852a12008-06-19 14:20:11 -04002089 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002090 if (error)
2091 goto error_splat_root;
2092
David Howellsf7b422b2006-06-09 09:34:33 -04002093 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04002094 mnt->mnt_sb = s;
2095 mnt->mnt_root = mntroot;
Chuck Lever06559602007-07-01 12:12:35 -04002096 error = 0;
2097
2098out:
Trond Myklebust33852a12008-06-19 14:20:11 -04002099 kfree(data->nfs_server.hostname);
2100 kfree(data->mount_server.hostname);
David Howells08734042009-04-03 16:42:42 +01002101 kfree(data->fscache_uniq);
Trond Myklebust33852a12008-06-19 14:20:11 -04002102 security_free_mnt_opts(&data->lsm_opts);
2103out_free_fh:
2104 kfree(mntfh);
2105 kfree(data);
Chuck Lever06559602007-07-01 12:12:35 -04002106 return error;
Trond Myklebust816724e2006-06-24 08:41:41 -04002107
David Howells54ceac42006-08-22 20:06:13 -04002108out_err_nosb:
2109 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04002110 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002111
Eric Parisf9c3a382008-03-05 14:20:18 -05002112error_splat_root:
2113 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04002114error_splat_super:
Al Viro6f5bbff2009-05-06 01:34:22 -04002115 deactivate_locked_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:
Al Viro6f5bbff2009-05-06 01:34:22 -04002211 deactivate_locked_super(s);
David Howells54ceac42006-08-22 20:06:13 -04002212 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2213 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002214}
2215
2216#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -04002217
2218/*
2219 * Finish setting up a cloned NFS4 superblock
2220 */
2221static void nfs4_clone_super(struct super_block *sb,
2222 const struct super_block *old_sb)
David Howellsf7b422b2006-06-09 09:34:33 -04002223{
David Howells54ceac42006-08-22 20:06:13 -04002224 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2225 sb->s_blocksize = old_sb->s_blocksize;
2226 sb->s_maxbytes = old_sb->s_maxbytes;
2227 sb->s_time_gran = 1;
2228 sb->s_op = old_sb->s_op;
2229 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002230}
2231
2232/*
2233 * Set up an NFS4 superblock
2234 */
David Howells54ceac42006-08-22 20:06:13 -04002235static void nfs4_fill_super(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -04002236{
David Howellsf7b422b2006-06-09 09:34:33 -04002237 sb->s_time_gran = 1;
David Howellsf7b422b2006-06-09 09:34:33 -04002238 sb->s_op = &nfs4_sops;
David Howells54ceac42006-08-22 20:06:13 -04002239 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002240}
2241
Trond Myklebust01c3f052009-06-17 13:22:58 -07002242static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2243{
2244 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2245}
2246
David Howells54ceac42006-08-22 20:06:13 -04002247/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04002248 * Validate NFSv4 mount options
2249 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002250static int nfs4_validate_mount_data(void *options,
2251 struct nfs_parsed_mount_data *args,
2252 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04002253{
Chuck Lever4c568012007-12-10 14:59:28 -05002254 struct sockaddr_in *ap;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002255 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002256 char *c;
2257
2258 if (data == NULL)
2259 goto out_no_data;
2260
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002261 args->rsize = NFS_MAX_FILE_IO_SIZE;
2262 args->wsize = NFS_MAX_FILE_IO_SIZE;
Chuck Lever0e0cab72008-06-26 17:47:12 -04002263 args->acregmin = NFS_DEF_ACREGMIN;
2264 args->acregmax = NFS_DEF_ACREGMAX;
2265 args->acdirmin = NFS_DEF_ACDIRMIN;
2266 args->acdirmax = NFS_DEF_ACDIRMAX;
Chuck Leverf22d6d72008-03-14 14:10:22 -04002267 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
Chuck Lever6738b252008-06-24 16:33:54 -04002268 args->auth_flavors[0] = RPC_AUTH_UNIX;
2269 args->auth_flavor_len = 0;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002270
Chuck Leverf0768eb2007-07-01 12:13:01 -04002271 switch (data->version) {
2272 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05002273 ap = (struct sockaddr_in *)&args->nfs_server.address;
2274 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002275 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05002276 if (data->host_addrlen == 0)
2277 goto out_no_address;
2278 args->nfs_server.addrlen = data->host_addrlen;
2279 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002280 return -EFAULT;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002281 if (!nfs_verify_server_address((struct sockaddr *)
2282 &args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002283 goto out_no_address;
2284
Chuck Lever6738b252008-06-24 16:33:54 -04002285 if (data->auth_flavourlen) {
2286 if (data->auth_flavourlen > 1)
2287 goto out_inval_auth;
Trond Myklebust20c71f52007-09-20 20:23:51 -04002288 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002289 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04002290 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002291 return -EFAULT;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002292 }
2293
2294 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2295 if (IS_ERR(c))
2296 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002297 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002298
2299 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2300 if (IS_ERR(c))
2301 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002302 args->nfs_server.export_path = c;
2303 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002304
2305 c = strndup_user(data->client_addr.data, 16);
2306 if (IS_ERR(c))
2307 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002308 args->client_address = c;
2309
2310 /*
2311 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2312 * can deal with.
2313 */
2314
2315 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2316 args->rsize = data->rsize;
2317 args->wsize = data->wsize;
2318 args->timeo = data->timeo;
2319 args->retrans = data->retrans;
2320 args->acregmin = data->acregmin;
2321 args->acregmax = data->acregmax;
2322 args->acdirmin = data->acdirmin;
2323 args->acdirmax = data->acdirmax;
2324 args->nfs_server.protocol = data->proto;
Trond Myklebust259875e2008-07-02 14:43:47 -04002325 nfs_validate_transport_protocol(args);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002326
2327 break;
Chuck Lever80071222007-07-01 12:13:59 -04002328 default: {
Chuck Leverdc045892008-06-23 12:36:37 -04002329 int status;
Chuck Lever80071222007-07-01 12:13:59 -04002330
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002331 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever80071222007-07-01 12:13:59 -04002332 return -EINVAL;
2333
2334 if (!nfs_verify_server_address((struct sockaddr *)
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002335 &args->nfs_server.address))
Chuck Lever80071222007-07-01 12:13:59 -04002336 return -EINVAL;
Chuck Lever80071222007-07-01 12:13:59 -04002337
Chuck Levered596a82008-06-26 17:47:05 -04002338 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2339 args->nfs_server.port);
2340
Trond Myklebust259875e2008-07-02 14:43:47 -04002341 nfs_validate_transport_protocol(args);
2342
Trond Myklebust01c3f052009-06-17 13:22:58 -07002343 nfs4_validate_mount_flags(args);
2344
Chuck Lever6738b252008-06-24 16:33:54 -04002345 if (args->auth_flavor_len > 1)
Chuck Lever80071222007-07-01 12:13:59 -04002346 goto out_inval_auth;
Chuck Lever80071222007-07-01 12:13:59 -04002347
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002348 if (args->client_address == NULL)
Jeff Layton0a87cf12007-07-18 11:28:43 -04002349 goto out_no_client_address;
2350
Chuck Leverdc045892008-06-23 12:36:37 -04002351 status = nfs_parse_devname(dev_name,
2352 &args->nfs_server.hostname,
2353 NFS4_MAXNAMLEN,
2354 &args->nfs_server.export_path,
2355 NFS4_MAXPATHLEN);
2356 if (status < 0)
2357 return status;
2358
Chuck Lever80071222007-07-01 12:13:59 -04002359 break;
2360 }
Chuck Leverf0768eb2007-07-01 12:13:01 -04002361 }
2362
2363 return 0;
2364
2365out_no_data:
2366 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2367 return -EINVAL;
2368
2369out_inval_auth:
2370 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2371 data->auth_flavourlen);
2372 return -EINVAL;
2373
2374out_no_address:
2375 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2376 return -EINVAL;
Jeff Layton0a87cf12007-07-18 11:28:43 -04002377
2378out_no_client_address:
2379 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2380 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002381}
2382
2383/*
David Howells54ceac42006-08-22 20:06:13 -04002384 * Get the superblock for an NFS4 mountpoint
2385 */
Trond Myklebust816724e2006-06-24 08:41:41 -04002386static int nfs4_get_sb(struct file_system_type *fs_type,
2387 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002388{
Trond Myklebust33852a12008-06-19 14:20:11 -04002389 struct nfs_parsed_mount_data *data;
David Howells54ceac42006-08-22 20:06:13 -04002390 struct super_block *s;
2391 struct nfs_server *server;
Trond Myklebust33852a12008-06-19 14:20:11 -04002392 struct nfs_fh *mntfh;
David Howells54ceac42006-08-22 20:06:13 -04002393 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002394 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002395 struct nfs_sb_mountdata sb_mntdata = {
2396 .mntflags = flags,
2397 };
Trond Myklebust33852a12008-06-19 14:20:11 -04002398 int error = -ENOMEM;
David Howellsf7b422b2006-06-09 09:34:33 -04002399
Trond Myklebust33852a12008-06-19 14:20:11 -04002400 data = kzalloc(sizeof(*data), GFP_KERNEL);
2401 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2402 if (data == NULL || mntfh == NULL)
2403 goto out_free_fh;
2404
2405 security_init_mnt_opts(&data->lsm_opts);
Eric Parisf9c3a382008-03-05 14:20:18 -05002406
Chuck Leverf0768eb2007-07-01 12:13:01 -04002407 /* Validate the mount data */
Trond Myklebust33852a12008-06-19 14:20:11 -04002408 error = nfs4_validate_mount_data(raw_data, data, dev_name);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002409 if (error < 0)
2410 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002411
David Howells54ceac42006-08-22 20:06:13 -04002412 /* Get a volume representation */
Trond Myklebust33852a12008-06-19 14:20:11 -04002413 server = nfs4_create_server(data, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002414 if (IS_ERR(server)) {
2415 error = PTR_ERR(server);
Chuck Lever29eb9812007-07-01 12:12:30 -04002416 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002417 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002418 sb_mntdata.server = server;
David Howellsf7b422b2006-06-09 09:34:33 -04002419
Trond Myklebust75180df2007-05-16 16:53:28 -04002420 if (server->flags & NFS4_MOUNT_UNSHARED)
2421 compare_super = NULL;
2422
David Howells54ceac42006-08-22 20:06:13 -04002423 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002424 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002425 if (IS_ERR(s)) {
2426 error = PTR_ERR(s);
David Howellsf7b422b2006-06-09 09:34:33 -04002427 goto out_free;
Trond Myklebust816724e2006-06-24 08:41:41 -04002428 }
2429
Trond Myklebust5dd31772006-08-24 01:03:05 -04002430 if (s->s_fs_info != server) {
2431 nfs_free_server(server);
2432 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002433 } else {
2434 error = nfs_bdi_register(server);
2435 if (error)
2436 goto error_splat_super;
Trond Myklebust5dd31772006-08-24 01:03:05 -04002437 }
2438
David Howells54ceac42006-08-22 20:06:13 -04002439 if (!s->s_root) {
2440 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002441 nfs4_fill_super(s);
David Howells08734042009-04-03 16:42:42 +01002442 nfs_fscache_get_super_cookie(s, data);
Trond Myklebust816724e2006-06-24 08:41:41 -04002443 }
David Howellsf7b422b2006-06-09 09:34:33 -04002444
Trond Myklebust33852a12008-06-19 14:20:11 -04002445 mntroot = nfs4_get_root(s, mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002446 if (IS_ERR(mntroot)) {
2447 error = PTR_ERR(mntroot);
2448 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04002449 }
David Howells54ceac42006-08-22 20:06:13 -04002450
Trond Myklebust33852a12008-06-19 14:20:11 -04002451 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
Eric Paris46c8ac72008-05-02 13:42:42 -07002452 if (error)
2453 goto error_splat_root;
2454
David Howellsf7b422b2006-06-09 09:34:33 -04002455 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04002456 mnt->mnt_sb = s;
2457 mnt->mnt_root = mntroot;
Chuck Lever29eb9812007-07-01 12:12:30 -04002458 error = 0;
David Howells54ceac42006-08-22 20:06:13 -04002459
Chuck Lever29eb9812007-07-01 12:12:30 -04002460out:
Trond Myklebust33852a12008-06-19 14:20:11 -04002461 kfree(data->client_address);
2462 kfree(data->nfs_server.export_path);
2463 kfree(data->nfs_server.hostname);
David Howells08734042009-04-03 16:42:42 +01002464 kfree(data->fscache_uniq);
Trond Myklebust33852a12008-06-19 14:20:11 -04002465 security_free_mnt_opts(&data->lsm_opts);
2466out_free_fh:
2467 kfree(mntfh);
2468 kfree(data);
Trond Myklebust816724e2006-06-24 08:41:41 -04002469 return error;
David Howells54ceac42006-08-22 20:06:13 -04002470
Chuck Lever29eb9812007-07-01 12:12:30 -04002471out_free:
2472 nfs_free_server(server);
2473 goto out;
2474
Eric Paris46c8ac72008-05-02 13:42:42 -07002475error_splat_root:
2476 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04002477error_splat_super:
Al Viro6f5bbff2009-05-06 01:34:22 -04002478 deactivate_locked_super(s);
Chuck Lever29eb9812007-07-01 12:12:30 -04002479 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002480}
2481
2482static void nfs4_kill_super(struct super_block *sb)
2483{
2484 struct nfs_server *server = NFS_SB(sb);
2485
Trond Myklebust515d8612008-12-23 15:21:46 -05002486 nfs_super_return_all_delegations(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04002487 kill_anon_super(sb);
2488
2489 nfs4_renewd_prepare_shutdown(server);
David Howells08734042009-04-03 16:42:42 +01002490 nfs_fscache_release_super_cookie(sb);
David Howells54ceac42006-08-22 20:06:13 -04002491 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002492}
2493
2494/*
David Howells54ceac42006-08-22 20:06:13 -04002495 * Clone an NFS4 server record on xdev traversal (FSID-change)
David Howellsf7b422b2006-06-09 09:34:33 -04002496 */
David Howells54ceac42006-08-22 20:06:13 -04002497static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2498 const char *dev_name, void *raw_data,
2499 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002500{
2501 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002502 struct super_block *s;
2503 struct nfs_server *server;
2504 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002505 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002506 struct nfs_sb_mountdata sb_mntdata = {
2507 .mntflags = flags,
2508 };
David Howells54ceac42006-08-22 20:06:13 -04002509 int error;
2510
2511 dprintk("--> nfs4_xdev_get_sb()\n");
2512
2513 /* create a new volume representation */
2514 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2515 if (IS_ERR(server)) {
2516 error = PTR_ERR(server);
2517 goto out_err_noserver;
2518 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002519 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002520
Trond Myklebust75180df2007-05-16 16:53:28 -04002521 if (server->flags & NFS4_MOUNT_UNSHARED)
2522 compare_super = NULL;
2523
David Howells54ceac42006-08-22 20:06:13 -04002524 /* Get a superblock - note that we may end up sharing one that already exists */
Andy Adamsonec9a05c2008-10-17 10:44:37 -04002525 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002526 if (IS_ERR(s)) {
2527 error = PTR_ERR(s);
2528 goto out_err_nosb;
2529 }
2530
2531 if (s->s_fs_info != server) {
2532 nfs_free_server(server);
2533 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002534 } else {
2535 error = nfs_bdi_register(server);
2536 if (error)
2537 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002538 }
2539
2540 if (!s->s_root) {
2541 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002542 nfs4_clone_super(s, data->sb);
2543 }
2544
2545 mntroot = nfs4_get_root(s, data->fh);
2546 if (IS_ERR(mntroot)) {
2547 error = PTR_ERR(mntroot);
2548 goto error_splat_super;
2549 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002550 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2551 dput(mntroot);
2552 error = -ESTALE;
2553 goto error_splat_super;
2554 }
David Howells54ceac42006-08-22 20:06:13 -04002555
2556 s->s_flags |= MS_ACTIVE;
2557 mnt->mnt_sb = s;
2558 mnt->mnt_root = mntroot;
2559
Eric Paris46c8ac72008-05-02 13:42:42 -07002560 security_sb_clone_mnt_opts(data->sb, s);
2561
David Howells54ceac42006-08-22 20:06:13 -04002562 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2563 return 0;
2564
2565out_err_nosb:
2566 nfs_free_server(server);
2567out_err_noserver:
2568 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2569 return error;
2570
2571error_splat_super:
Al Viro6f5bbff2009-05-06 01:34:22 -04002572 deactivate_locked_super(s);
David Howells54ceac42006-08-22 20:06:13 -04002573 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2574 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002575}
2576
David Howells54ceac42006-08-22 20:06:13 -04002577/*
2578 * Create an NFS4 server record on referral traversal
2579 */
2580static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2581 const char *dev_name, void *raw_data,
2582 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002583{
2584 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002585 struct super_block *s;
2586 struct nfs_server *server;
2587 struct dentry *mntroot;
2588 struct nfs_fh mntfh;
Trond Myklebust75180df2007-05-16 16:53:28 -04002589 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002590 struct nfs_sb_mountdata sb_mntdata = {
2591 .mntflags = flags,
2592 };
David Howells54ceac42006-08-22 20:06:13 -04002593 int error;
2594
2595 dprintk("--> nfs4_referral_get_sb()\n");
2596
2597 /* create a new volume representation */
2598 server = nfs4_create_referral_server(data, &mntfh);
2599 if (IS_ERR(server)) {
2600 error = PTR_ERR(server);
2601 goto out_err_noserver;
2602 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002603 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002604
Trond Myklebust75180df2007-05-16 16:53:28 -04002605 if (server->flags & NFS4_MOUNT_UNSHARED)
2606 compare_super = NULL;
2607
David Howells54ceac42006-08-22 20:06:13 -04002608 /* Get a superblock - note that we may end up sharing one that already exists */
Andy Adamsonec9a05c2008-10-17 10:44:37 -04002609 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002610 if (IS_ERR(s)) {
2611 error = PTR_ERR(s);
2612 goto out_err_nosb;
2613 }
2614
2615 if (s->s_fs_info != server) {
2616 nfs_free_server(server);
2617 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002618 } else {
2619 error = nfs_bdi_register(server);
2620 if (error)
2621 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002622 }
2623
2624 if (!s->s_root) {
2625 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002626 nfs4_fill_super(s);
2627 }
2628
Trond Myklebustf2d0d852007-02-02 14:46:09 -08002629 mntroot = nfs4_get_root(s, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002630 if (IS_ERR(mntroot)) {
2631 error = PTR_ERR(mntroot);
2632 goto error_splat_super;
2633 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002634 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2635 dput(mntroot);
2636 error = -ESTALE;
2637 goto error_splat_super;
2638 }
David Howells54ceac42006-08-22 20:06:13 -04002639
2640 s->s_flags |= MS_ACTIVE;
2641 mnt->mnt_sb = s;
2642 mnt->mnt_root = mntroot;
2643
Eric Paris46c8ac72008-05-02 13:42:42 -07002644 security_sb_clone_mnt_opts(data->sb, s);
2645
David Howells54ceac42006-08-22 20:06:13 -04002646 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2647 return 0;
2648
2649out_err_nosb:
2650 nfs_free_server(server);
2651out_err_noserver:
2652 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2653 return error;
2654
2655error_splat_super:
Al Viro6f5bbff2009-05-06 01:34:22 -04002656 deactivate_locked_super(s);
David Howells54ceac42006-08-22 20:06:13 -04002657 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2658 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002659}
2660
David Howells54ceac42006-08-22 20:06:13 -04002661#endif /* CONFIG_NFS_V4 */