blob: 2a4a024a4e7bf09c53575b6ef74398c67779d329 [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 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * 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>
David Howellsf7b422b2006-06-09 09:34:33 -040050#include <linux/nfs_xdr.h>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080051#include <linux/magic.h>
Chuck Leverbf0fd762007-07-01 12:13:44 -040052#include <linux/parser.h>
David Howellsf7b422b2006-06-09 09:34:33 -040053
54#include <asm/system.h>
55#include <asm/uaccess.h>
56
57#include "nfs4_fs.h"
58#include "callback.h"
59#include "delegation.h"
60#include "iostat.h"
61#include "internal.h"
62
63#define NFSDBG_FACILITY NFSDBG_VFS
64
Chuck Leverbf0fd762007-07-01 12:13:44 -040065enum {
66 /* Mount options that take no arguments */
67 Opt_soft, Opt_hard,
68 Opt_intr, Opt_nointr,
69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040074 Opt_udp, Opt_tcp, Opt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -040075 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
Trond Myklebust75180df2007-05-16 16:53:28 -040077 Opt_sharecache, Opt_nosharecache,
Chuck Leverbf0fd762007-07-01 12:13:44 -040078
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
Chuck Levere887cbc2007-10-26 13:32:29 -040088 Opt_mountvers,
Chuck Leverad879ce2007-10-26 13:32:24 -040089 Opt_nfsvers,
Chuck Leverbf0fd762007-07-01 12:13:44 -040090
91 /* Mount options that take string arguments */
Chuck Lever33832032007-12-10 14:59:13 -050092 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
Chuck Lever0ac83772007-09-11 18:01:04 -040093 Opt_addr, Opt_mountaddr, Opt_clientaddr,
Chuck Leverbf0fd762007-07-01 12:13:44 -040094
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
97
98 Opt_err
99};
100
101static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_soft, "soft" },
105 { Opt_hard, "hard" },
106 { Opt_intr, "intr" },
107 { Opt_nointr, "nointr" },
108 { Opt_posix, "posix" },
109 { Opt_noposix, "noposix" },
110 { Opt_cto, "cto" },
111 { Opt_nocto, "nocto" },
112 { Opt_ac, "ac" },
113 { Opt_noac, "noac" },
114 { Opt_lock, "lock" },
115 { Opt_nolock, "nolock" },
116 { Opt_v2, "v2" },
117 { Opt_v3, "v3" },
118 { Opt_udp, "udp" },
119 { Opt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400120 { Opt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400121 { Opt_acl, "acl" },
122 { Opt_noacl, "noacl" },
123 { Opt_rdirplus, "rdirplus" },
124 { Opt_nordirplus, "nordirplus" },
Trond Myklebust75180df2007-05-16 16:53:28 -0400125 { Opt_sharecache, "sharecache" },
126 { Opt_nosharecache, "nosharecache" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400127
128 { Opt_port, "port=%u" },
129 { Opt_rsize, "rsize=%u" },
130 { Opt_wsize, "wsize=%u" },
131 { Opt_bsize, "bsize=%u" },
132 { Opt_timeo, "timeo=%u" },
133 { Opt_retrans, "retrans=%u" },
134 { Opt_acregmin, "acregmin=%u" },
135 { Opt_acregmax, "acregmax=%u" },
136 { Opt_acdirmin, "acdirmin=%u" },
137 { Opt_acdirmax, "acdirmax=%u" },
138 { Opt_actimeo, "actimeo=%u" },
139 { Opt_userspace, "retry=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400142 { Opt_mountvers, "mountvers=%u" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
145
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
Chuck Lever33832032007-12-10 14:59:13 -0500151 { Opt_mounthost, "mounthost=%s" },
Chuck Lever0ac83772007-09-11 18:01:04 -0400152 { Opt_mountaddr, "mountaddr=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400153
154 { Opt_err, NULL }
155};
156
157enum {
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400159
160 Opt_xprt_err
161};
162
163static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400166 { Opt_xprt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400167
168 { Opt_xprt_err, NULL }
169};
170
171enum {
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177 Opt_sec_err
178};
179
180static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
184
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
188
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
192
Olga Kornievskaia8d042212008-02-13 16:47:06 -0500193 { Opt_sec_spkm, "spkm3" },
194 { Opt_sec_spkmi, "spkm3i" },
195 { Opt_sec_spkmp, "spkm3p" },
196
Chuck Leverbf0fd762007-07-01 12:13:44 -0400197 { Opt_sec_err, NULL }
198};
199
200
Al Viro42faad92008-04-24 07:21:56 -0400201static void nfs_umount_begin(struct super_block *);
Trond Myklebust816724e2006-06-24 08:41:41 -0400202static int nfs_statfs(struct dentry *, struct kstatfs *);
David Howellsf7b422b2006-06-09 09:34:33 -0400203static int nfs_show_options(struct seq_file *, struct vfsmount *);
204static int nfs_show_stats(struct seq_file *, struct vfsmount *);
Trond Myklebust816724e2006-06-24 08:41:41 -0400205static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
David Howells54ceac42006-08-22 20:06:13 -0400206static int nfs_xdev_get_sb(struct file_system_type *fs_type,
Trond Myklebust816724e2006-06-24 08:41:41 -0400207 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -0400208static void nfs_kill_super(struct super_block *);
Steve Dicksonef818a22007-11-08 04:05:04 -0500209static void nfs_put_super(struct super_block *);
David Howellsf7b422b2006-06-09 09:34:33 -0400210
211static struct file_system_type nfs_fs_type = {
212 .owner = THIS_MODULE,
213 .name = "nfs",
214 .get_sb = nfs_get_sb,
215 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700216 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400217};
218
David Howells54ceac42006-08-22 20:06:13 -0400219struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400220 .owner = THIS_MODULE,
221 .name = "nfs",
David Howells54ceac42006-08-22 20:06:13 -0400222 .get_sb = nfs_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400223 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700224 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400225};
226
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800227static const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400228 .alloc_inode = nfs_alloc_inode,
229 .destroy_inode = nfs_destroy_inode,
230 .write_inode = nfs_write_inode,
Steve Dicksonef818a22007-11-08 04:05:04 -0500231 .put_super = nfs_put_super,
David Howellsf7b422b2006-06-09 09:34:33 -0400232 .statfs = nfs_statfs,
233 .clear_inode = nfs_clear_inode,
234 .umount_begin = nfs_umount_begin,
235 .show_options = nfs_show_options,
236 .show_stats = nfs_show_stats,
237};
238
239#ifdef CONFIG_NFS_V4
Trond Myklebust816724e2006-06-24 08:41:41 -0400240static int nfs4_get_sb(struct file_system_type *fs_type,
241 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howells54ceac42006-08-22 20:06:13 -0400242static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244static int nfs4_referral_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -0400246static void nfs4_kill_super(struct super_block *sb);
247
248static struct file_system_type nfs4_fs_type = {
249 .owner = THIS_MODULE,
250 .name = "nfs4",
251 .get_sb = nfs4_get_sb,
252 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700253 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400254};
255
David Howells54ceac42006-08-22 20:06:13 -0400256struct file_system_type nfs4_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400257 .owner = THIS_MODULE,
258 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400259 .get_sb = nfs4_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400260 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700261 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400262};
263
David Howells54ceac42006-08-22 20:06:13 -0400264struct file_system_type nfs4_referral_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400265 .owner = THIS_MODULE,
266 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400267 .get_sb = nfs4_referral_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400268 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700269 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400270};
271
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800272static const struct super_operations nfs4_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400273 .alloc_inode = nfs_alloc_inode,
274 .destroy_inode = nfs_destroy_inode,
275 .write_inode = nfs_write_inode,
276 .statfs = nfs_statfs,
277 .clear_inode = nfs4_clear_inode,
278 .umount_begin = nfs_umount_begin,
279 .show_options = nfs_show_options,
280 .show_stats = nfs_show_stats,
281};
282#endif
283
Rusty Russell8e1f9362007-07-17 04:03:17 -0700284static struct shrinker acl_shrinker = {
285 .shrink = nfs_access_cache_shrinker,
286 .seeks = DEFAULT_SEEKS,
287};
Trond Myklebust979df722006-07-25 11:28:19 -0400288
David Howellsf7b422b2006-06-09 09:34:33 -0400289/*
290 * Register the NFS filesystems
291 */
292int __init register_nfs_fs(void)
293{
294 int ret;
295
296 ret = register_filesystem(&nfs_fs_type);
297 if (ret < 0)
298 goto error_0;
299
David Howellsf7b422b2006-06-09 09:34:33 -0400300 ret = nfs_register_sysctl();
301 if (ret < 0)
302 goto error_1;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800303#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400304 ret = register_filesystem(&nfs4_fs_type);
305 if (ret < 0)
306 goto error_2;
307#endif
Rusty Russell8e1f9362007-07-17 04:03:17 -0700308 register_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400309 return 0;
310
311#ifdef CONFIG_NFS_V4
312error_2:
313 nfs_unregister_sysctl();
Peter Zijlstra89a09142007-03-16 13:38:26 -0800314#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400315error_1:
316 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400317error_0:
318 return ret;
319}
320
321/*
322 * Unregister the NFS filesystems
323 */
324void __exit unregister_nfs_fs(void)
325{
Rusty Russell8e1f9362007-07-17 04:03:17 -0700326 unregister_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400327#ifdef CONFIG_NFS_V4
328 unregister_filesystem(&nfs4_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400329#endif
Alexey Dobriyan49af7ee2007-09-18 22:46:40 -0700330 nfs_unregister_sysctl();
David Howellsf7b422b2006-06-09 09:34:33 -0400331 unregister_filesystem(&nfs_fs_type);
332}
333
Steve Dicksonef818a22007-11-08 04:05:04 -0500334void nfs_sb_active(struct nfs_server *server)
335{
336 atomic_inc(&server->active);
337}
338
339void nfs_sb_deactive(struct nfs_server *server)
340{
341 if (atomic_dec_and_test(&server->active))
342 wake_up(&server->active_wq);
343}
344
345static void nfs_put_super(struct super_block *sb)
346{
347 struct nfs_server *server = NFS_SB(sb);
348 /*
349 * Make sure there are no outstanding ops to this server.
350 * If so, wait for them to finish before allowing the
351 * unmount to continue.
352 */
353 wait_event(server->active_wq, atomic_read(&server->active) == 0);
354}
355
David Howellsf7b422b2006-06-09 09:34:33 -0400356/*
357 * Deliver file system statistics to userspace
358 */
Trond Myklebust816724e2006-06-24 08:41:41 -0400359static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400360{
David Howells0c7d90c2006-08-22 20:06:10 -0400361 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400362 unsigned char blockbits;
363 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400364 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
David Howellsf7b422b2006-06-09 09:34:33 -0400365 struct nfs_fattr fattr;
366 struct nfs_fsstat res = {
367 .fattr = &fattr,
368 };
369 int error;
370
371 lock_kernel();
372
David Howells8fa5c002006-08-22 20:06:12 -0400373 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
David Howellsf7b422b2006-06-09 09:34:33 -0400374 if (error < 0)
375 goto out_err;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700376 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400377
378 /*
379 * Current versions of glibc do not correctly handle the
380 * case where f_frsize != f_bsize. Eventually we want to
381 * report the value of wtmult in this field.
382 */
David Howells0c7d90c2006-08-22 20:06:10 -0400383 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400384
385 /*
386 * On most *nix systems, f_blocks, f_bfree, and f_bavail
387 * are reported in units of f_frsize. Linux hasn't had
388 * an f_frsize field in its statfs struct until recently,
389 * thus historically Linux's sys_statfs reports these
390 * fields in units of f_bsize.
391 */
David Howells0c7d90c2006-08-22 20:06:10 -0400392 buf->f_bsize = dentry->d_sb->s_blocksize;
393 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400394 blockres = (1 << blockbits) - 1;
395 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
396 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
397 buf->f_bavail = (res.abytes + blockres) >> blockbits;
398
399 buf->f_files = res.tfiles;
400 buf->f_ffree = res.afiles;
401
402 buf->f_namelen = server->namelen;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700403
David Howellsf7b422b2006-06-09 09:34:33 -0400404 unlock_kernel();
405 return 0;
406
407 out_err:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700408 dprintk("%s: statfs error = %d\n", __func__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700409 unlock_kernel();
410 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400411}
412
David Howells7d4e2742006-08-22 20:06:07 -0400413/*
414 * Map the security flavour number to a name
415 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400416static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
417{
David Howells7d4e2742006-08-22 20:06:07 -0400418 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400419 rpc_authflavor_t flavour;
420 const char *str;
421 } sec_flavours[] = {
422 { RPC_AUTH_NULL, "null" },
423 { RPC_AUTH_UNIX, "sys" },
424 { RPC_AUTH_GSS_KRB5, "krb5" },
425 { RPC_AUTH_GSS_KRB5I, "krb5i" },
426 { RPC_AUTH_GSS_KRB5P, "krb5p" },
427 { RPC_AUTH_GSS_LKEY, "lkey" },
428 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
429 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
430 { RPC_AUTH_GSS_SPKM, "spkm" },
431 { RPC_AUTH_GSS_SPKMI, "spkmi" },
432 { RPC_AUTH_GSS_SPKMP, "spkmp" },
Chuck Lever4d81cd12007-07-01 12:12:40 -0400433 { UINT_MAX, "unknown" }
Trond Myklebust81039f12006-06-09 09:34:34 -0400434 };
435 int i;
436
Chuck Lever4d81cd12007-07-01 12:12:40 -0400437 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
Trond Myklebust81039f12006-06-09 09:34:34 -0400438 if (sec_flavours[i].flavour == flavour)
439 break;
440 }
441 return sec_flavours[i].str;
442}
443
Chuck Lever82d101d2008-03-14 14:10:37 -0400444static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
445 int showdefaults)
446{
447 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
448
449 switch (sap->sa_family) {
450 case AF_INET: {
451 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
452 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
453 NIPQUAD(sin->sin_addr.s_addr));
454 break;
455 }
456 case AF_INET6: {
457 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
458 seq_printf(m, ",mountaddr=" NIP6_FMT,
459 NIP6(sin6->sin6_addr));
460 break;
461 }
462 default:
463 if (showdefaults)
464 seq_printf(m, ",mountaddr=unspecified");
465 }
466
467 if (nfss->mountd_version || showdefaults)
468 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
469 if (nfss->mountd_port || showdefaults)
470 seq_printf(m, ",mountport=%u", nfss->mountd_port);
471
472 switch (nfss->mountd_protocol) {
473 case IPPROTO_UDP:
474 seq_printf(m, ",mountproto=udp");
475 break;
476 case IPPROTO_TCP:
477 seq_printf(m, ",mountproto=tcp");
478 break;
479 default:
480 if (showdefaults)
481 seq_printf(m, ",mountproto=auto");
482 }
483}
484
David Howellsf7b422b2006-06-09 09:34:33 -0400485/*
486 * Describe the mount options in force on this server representation
487 */
Chuck Lever82d101d2008-03-14 14:10:37 -0400488static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
489 int showdefaults)
David Howellsf7b422b2006-06-09 09:34:33 -0400490{
David Howells509de812006-08-22 20:06:11 -0400491 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400492 int flag;
David Howells509de812006-08-22 20:06:11 -0400493 const char *str;
494 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400495 } nfs_info[] = {
496 { NFS_MOUNT_SOFT, ",soft", ",hard" },
Chuck Lever82d101d2008-03-14 14:10:37 -0400497 { NFS_MOUNT_INTR, ",intr", ",nointr" },
498 { NFS_MOUNT_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400499 { NFS_MOUNT_NOCTO, ",nocto", "" },
500 { NFS_MOUNT_NOAC, ",noac", "" },
501 { NFS_MOUNT_NONLM, ",nolock", "" },
502 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400503 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Trond Myklebust75180df2007-05-16 16:53:28 -0400504 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
David Howellsf7b422b2006-06-09 09:34:33 -0400505 { 0, NULL, NULL }
506 };
David Howells509de812006-08-22 20:06:11 -0400507 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400508 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400509 u32 version = clp->rpc_ops->version;
David Howellsf7b422b2006-06-09 09:34:33 -0400510
Chuck Lever82d101d2008-03-14 14:10:37 -0400511 seq_printf(m, ",vers=%u", version);
Chuck Lever2d767432008-03-14 14:10:08 -0400512 seq_printf(m, ",rsize=%u", nfss->rsize);
513 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400514 if (nfss->bsize != 0)
515 seq_printf(m, ",bsize=%u", nfss->bsize);
516 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400517 if (nfss->acregmin != 3*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400518 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400519 if (nfss->acregmax != 60*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400520 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400521 if (nfss->acdirmin != 30*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400522 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400523 if (nfss->acdirmax != 60*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400524 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400525 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
526 if (nfss->flags & nfs_infop->flag)
527 seq_puts(m, nfs_infop->str);
528 else
529 seq_puts(m, nfs_infop->nostr);
530 }
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400531 seq_printf(m, ",proto=%s",
532 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
Chuck Lever82d101d2008-03-14 14:10:37 -0400533 if (version == 4) {
534 if (nfss->port != NFS_PORT)
535 seq_printf(m, ",port=%u", nfss->port);
536 } else
537 if (nfss->port)
538 seq_printf(m, ",port=%u", nfss->port);
539
Trond Myklebust33170232007-12-20 16:03:59 -0500540 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
541 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400542 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400543
544 if (version != 4)
545 nfs_show_mountd_options(m, nfss, showdefaults);
546
547#ifdef CONFIG_NFS_V4
548 if (clp->rpc_ops->version == 4)
549 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
550#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400551}
552
553/*
554 * Describe the mount options on this VFS mountpoint
555 */
556static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
557{
558 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
559
560 nfs_show_mount_options(m, nfss, 0);
561
Chuck Lever5d8515c2007-12-10 14:57:16 -0500562 seq_printf(m, ",addr=%s",
563 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
564 RPC_DISPLAY_ADDR));
David Howellsf7b422b2006-06-09 09:34:33 -0400565
566 return 0;
567}
568
569/*
570 * Present statistical information for this VFS mountpoint
571 */
572static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
573{
574 int i, cpu;
575 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
576 struct rpc_auth *auth = nfss->client->cl_auth;
577 struct nfs_iostats totals = { };
578
579 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
580
581 /*
582 * Display all mount option settings
583 */
584 seq_printf(m, "\n\topts:\t");
585 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
586 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
587 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
589 nfs_show_mount_options(m, nfss, 1);
590
591 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
592
593 seq_printf(m, "\n\tcaps:\t");
594 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400595 seq_printf(m, ",wtmult=%u", nfss->wtmult);
596 seq_printf(m, ",dtsize=%u", nfss->dtsize);
597 seq_printf(m, ",bsize=%u", nfss->bsize);
598 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400599
600#ifdef CONFIG_NFS_V4
Trond Myklebust40c553192007-12-14 14:56:07 -0500601 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400602 seq_printf(m, "\n\tnfsv4:\t");
603 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
604 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
605 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
606 }
607#endif
608
609 /*
610 * Display security flavor in effect for this mount
611 */
Chuck Lever2d767432008-03-14 14:10:08 -0400612 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400613 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400614 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400615
616 /*
617 * Display superblock I/O counters
618 */
619 for_each_possible_cpu(cpu) {
620 struct nfs_iostats *stats;
621
622 preempt_disable();
623 stats = per_cpu_ptr(nfss->io_stats, cpu);
624
625 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
626 totals.events[i] += stats->events[i];
627 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
628 totals.bytes[i] += stats->bytes[i];
629
630 preempt_enable();
631 }
632
633 seq_printf(m, "\n\tevents:\t");
634 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
635 seq_printf(m, "%lu ", totals.events[i]);
636 seq_printf(m, "\n\tbytes:\t");
637 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
638 seq_printf(m, "%Lu ", totals.bytes[i]);
639 seq_printf(m, "\n");
640
641 rpc_print_iostats(m, nfss->client);
642
643 return 0;
644}
645
646/*
647 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400648 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400649 */
Al Viro42faad92008-04-24 07:21:56 -0400650static void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400651{
Al Viro42faad92008-04-24 07:21:56 -0400652 struct nfs_server *server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400653 struct rpc_clnt *rpc;
654
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400655 /* -EIO all pending I/O */
656 rpc = server->client_acl;
657 if (!IS_ERR(rpc))
658 rpc_killall_tasks(rpc);
659 rpc = server->client;
660 if (!IS_ERR(rpc))
661 rpc_killall_tasks(rpc);
David Howellsf7b422b2006-06-09 09:34:33 -0400662}
663
664/*
Chuck Lever04dcd6e2007-12-10 14:57:53 -0500665 * Set the port number in an address. Be agnostic about the address family.
666 */
667static void nfs_set_port(struct sockaddr *sap, unsigned short port)
668{
669 switch (sap->sa_family) {
670 case AF_INET: {
671 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
672 ap->sin_port = htons(port);
673 break;
674 }
675 case AF_INET6: {
676 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
677 ap->sin6_port = htons(port);
678 break;
679 }
680 }
681}
682
683/*
Chuck Levercdcd7f92007-12-10 14:57:45 -0500684 * Sanity-check a server address provided by the mount command.
685 *
686 * Address family must be initialized, and address must not be
687 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400688 */
689static int nfs_verify_server_address(struct sockaddr *addr)
690{
691 switch (addr->sa_family) {
692 case AF_INET: {
Chuck Levercdcd7f92007-12-10 14:57:45 -0500693 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700694 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f92007-12-10 14:57:45 -0500695 }
696 case AF_INET6: {
697 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
698 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -0400699 }
700 }
701
702 return 0;
703}
704
705/*
Chuck Lever9412b922007-12-10 14:59:21 -0500706 * Parse string addresses passed in via a mount option,
707 * and construct a sockaddr based on the result.
708 *
709 * If address parsing fails, set the sockaddr's address
710 * family to AF_UNSPEC to force nfs_verify_server_address()
711 * to punt the mount.
712 */
713static void nfs_parse_server_address(char *value,
Chuck Lever4c568012007-12-10 14:59:28 -0500714 struct sockaddr *sap,
715 size_t *len)
Chuck Lever9412b922007-12-10 14:59:21 -0500716{
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500717 if (strchr(value, ':')) {
718 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
719 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
Chuck Lever9412b922007-12-10 14:59:21 -0500720
Chuck Lever3c7c7e42007-12-10 14:59:35 -0500721 ap->sin6_family = AF_INET6;
722 *len = sizeof(*ap);
723 if (in6_pton(value, -1, addr, '\0', NULL))
724 return;
725 } else {
726 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
727 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
728
729 ap->sin_family = AF_INET;
730 *len = sizeof(*ap);
731 if (in4_pton(value, -1, addr, '\0', NULL))
732 return;
733 }
Chuck Lever9412b922007-12-10 14:59:21 -0500734
735 sap->sa_family = AF_UNSPEC;
Chuck Lever4c568012007-12-10 14:59:28 -0500736 *len = 0;
Chuck Lever9412b922007-12-10 14:59:21 -0500737}
738
739/*
Chuck Leverbf0fd762007-07-01 12:13:44 -0400740 * Error-check and convert a string of mount options from user space into
741 * a data structure
742 */
743static int nfs_parse_mount_options(char *raw,
744 struct nfs_parsed_mount_data *mnt)
745{
Eric Parisf9c3a382008-03-05 14:20:18 -0500746 char *p, *string, *secdata;
Eric Parisf9c3a382008-03-05 14:20:18 -0500747 int rc;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400748
749 if (!raw) {
750 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
751 return 1;
752 }
753 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
754
Eric Parisf9c3a382008-03-05 14:20:18 -0500755 secdata = alloc_secdata();
756 if (!secdata)
757 goto out_nomem;
758
759 rc = security_sb_copy_data(raw, secdata);
760 if (rc)
761 goto out_security_failure;
762
763 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
764 if (rc)
765 goto out_security_failure;
766
767 free_secdata(secdata);
768
Chuck Leverbf0fd762007-07-01 12:13:44 -0400769 while ((p = strsep(&raw, ",")) != NULL) {
770 substring_t args[MAX_OPT_ARGS];
771 int option, token;
772
773 if (!*p)
774 continue;
775
776 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
777
778 token = match_token(p, nfs_mount_option_tokens, args);
779 switch (token) {
780 case Opt_soft:
781 mnt->flags |= NFS_MOUNT_SOFT;
782 break;
783 case Opt_hard:
784 mnt->flags &= ~NFS_MOUNT_SOFT;
785 break;
786 case Opt_intr:
Chuck Leverbf0fd762007-07-01 12:13:44 -0400787 case Opt_nointr:
Chuck Leverbf0fd762007-07-01 12:13:44 -0400788 break;
789 case Opt_posix:
790 mnt->flags |= NFS_MOUNT_POSIX;
791 break;
792 case Opt_noposix:
793 mnt->flags &= ~NFS_MOUNT_POSIX;
794 break;
795 case Opt_cto:
796 mnt->flags &= ~NFS_MOUNT_NOCTO;
797 break;
798 case Opt_nocto:
799 mnt->flags |= NFS_MOUNT_NOCTO;
800 break;
801 case Opt_ac:
802 mnt->flags &= ~NFS_MOUNT_NOAC;
803 break;
804 case Opt_noac:
805 mnt->flags |= NFS_MOUNT_NOAC;
806 break;
807 case Opt_lock:
808 mnt->flags &= ~NFS_MOUNT_NONLM;
809 break;
810 case Opt_nolock:
811 mnt->flags |= NFS_MOUNT_NONLM;
812 break;
813 case Opt_v2:
814 mnt->flags &= ~NFS_MOUNT_VER3;
815 break;
816 case Opt_v3:
817 mnt->flags |= NFS_MOUNT_VER3;
818 break;
819 case Opt_udp:
820 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -0400821 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400822 mnt->timeo = 7;
823 mnt->retrans = 5;
824 break;
825 case Opt_tcp:
826 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -0400827 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400828 mnt->timeo = 600;
829 mnt->retrans = 2;
830 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400831 case Opt_rdma:
832 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
833 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
834 mnt->timeo = 600;
835 mnt->retrans = 2;
836 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400837 case Opt_acl:
838 mnt->flags &= ~NFS_MOUNT_NOACL;
839 break;
840 case Opt_noacl:
841 mnt->flags |= NFS_MOUNT_NOACL;
842 break;
843 case Opt_rdirplus:
844 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
845 break;
846 case Opt_nordirplus:
847 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
848 break;
Trond Myklebust75180df2007-05-16 16:53:28 -0400849 case Opt_sharecache:
850 mnt->flags &= ~NFS_MOUNT_UNSHARED;
851 break;
852 case Opt_nosharecache:
853 mnt->flags |= NFS_MOUNT_UNSHARED;
854 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400855
856 case Opt_port:
857 if (match_int(args, &option))
858 return 0;
859 if (option < 0 || option > 65535)
860 return 0;
Chuck Leverf22d6d72008-03-14 14:10:22 -0400861 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400862 break;
863 case Opt_rsize:
864 if (match_int(args, &mnt->rsize))
865 return 0;
866 break;
867 case Opt_wsize:
868 if (match_int(args, &mnt->wsize))
869 return 0;
870 break;
871 case Opt_bsize:
872 if (match_int(args, &option))
873 return 0;
874 if (option < 0)
875 return 0;
876 mnt->bsize = option;
877 break;
878 case Opt_timeo:
879 if (match_int(args, &mnt->timeo))
880 return 0;
881 break;
882 case Opt_retrans:
883 if (match_int(args, &mnt->retrans))
884 return 0;
885 break;
886 case Opt_acregmin:
887 if (match_int(args, &mnt->acregmin))
888 return 0;
889 break;
890 case Opt_acregmax:
891 if (match_int(args, &mnt->acregmax))
892 return 0;
893 break;
894 case Opt_acdirmin:
895 if (match_int(args, &mnt->acdirmin))
896 return 0;
897 break;
898 case Opt_acdirmax:
899 if (match_int(args, &mnt->acdirmax))
900 return 0;
901 break;
902 case Opt_actimeo:
903 if (match_int(args, &option))
904 return 0;
905 if (option < 0)
906 return 0;
907 mnt->acregmin =
908 mnt->acregmax =
909 mnt->acdirmin =
910 mnt->acdirmax = option;
911 break;
912 case Opt_namelen:
913 if (match_int(args, &mnt->namlen))
914 return 0;
915 break;
916 case Opt_mountport:
917 if (match_int(args, &option))
918 return 0;
919 if (option < 0 || option > 65535)
920 return 0;
921 mnt->mount_server.port = option;
922 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400923 case Opt_mountvers:
924 if (match_int(args, &option))
925 return 0;
926 if (option < 0)
927 return 0;
928 mnt->mount_server.version = option;
929 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -0400930 case Opt_nfsvers:
931 if (match_int(args, &option))
932 return 0;
933 switch (option) {
934 case 2:
935 mnt->flags &= ~NFS_MOUNT_VER3;
936 break;
937 case 3:
938 mnt->flags |= NFS_MOUNT_VER3;
939 break;
940 default:
941 goto out_unrec_vers;
942 }
943 break;
944
945 case Opt_sec:
946 string = match_strdup(args);
947 if (string == NULL)
948 goto out_nomem;
949 token = match_token(string, nfs_secflavor_tokens, args);
950 kfree(string);
951
952 /*
953 * The flags setting is for v2/v3. The flavor_len
954 * setting is for v4. v2/v3 also need to know the
955 * difference between NULL and UNIX.
956 */
957 switch (token) {
958 case Opt_sec_none:
959 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
960 mnt->auth_flavor_len = 0;
961 mnt->auth_flavors[0] = RPC_AUTH_NULL;
962 break;
963 case Opt_sec_sys:
964 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
965 mnt->auth_flavor_len = 0;
966 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
967 break;
968 case Opt_sec_krb5:
969 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
970 mnt->auth_flavor_len = 1;
971 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
972 break;
973 case Opt_sec_krb5i:
974 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
975 mnt->auth_flavor_len = 1;
976 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
977 break;
978 case Opt_sec_krb5p:
979 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
980 mnt->auth_flavor_len = 1;
981 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
982 break;
983 case Opt_sec_lkey:
984 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
985 mnt->auth_flavor_len = 1;
986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987 break;
988 case Opt_sec_lkeyi:
989 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
990 mnt->auth_flavor_len = 1;
991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992 break;
993 case Opt_sec_lkeyp:
994 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
995 mnt->auth_flavor_len = 1;
996 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
997 break;
998 case Opt_sec_spkm:
999 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1000 mnt->auth_flavor_len = 1;
1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1002 break;
1003 case Opt_sec_spkmi:
1004 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1005 mnt->auth_flavor_len = 1;
1006 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1007 break;
1008 case Opt_sec_spkmp:
1009 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010 mnt->auth_flavor_len = 1;
1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1012 break;
1013 default:
1014 goto out_unrec_sec;
1015 }
1016 break;
1017 case Opt_proto:
1018 string = match_strdup(args);
1019 if (string == NULL)
1020 goto out_nomem;
1021 token = match_token(string,
1022 nfs_xprt_protocol_tokens, args);
1023 kfree(string);
1024
1025 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001026 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001027 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001028 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001029 mnt->timeo = 7;
1030 mnt->retrans = 5;
1031 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001032 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001033 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001034 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001035 mnt->timeo = 600;
1036 mnt->retrans = 2;
1037 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001038 case Opt_xprt_rdma:
1039 /* vector side protocols to TCP */
1040 mnt->flags |= NFS_MOUNT_TCP;
1041 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1042 mnt->timeo = 600;
1043 mnt->retrans = 2;
1044 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001045 default:
1046 goto out_unrec_xprt;
1047 }
1048 break;
1049 case Opt_mountproto:
1050 string = match_strdup(args);
1051 if (string == NULL)
1052 goto out_nomem;
1053 token = match_token(string,
1054 nfs_xprt_protocol_tokens, args);
1055 kfree(string);
1056
1057 switch (token) {
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001058 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001059 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001060 break;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001061 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001062 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001063 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001064 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001065 default:
1066 goto out_unrec_xprt;
1067 }
1068 break;
1069 case Opt_addr:
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 goto out_nomem;
Chuck Lever9412b922007-12-10 14:59:21 -05001073 nfs_parse_server_address(string, (struct sockaddr *)
Chuck Lever4c568012007-12-10 14:59:28 -05001074 &mnt->nfs_server.address,
1075 &mnt->nfs_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001076 kfree(string);
1077 break;
1078 case Opt_clientaddr:
1079 string = match_strdup(args);
1080 if (string == NULL)
1081 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001082 kfree(mnt->client_address);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001083 mnt->client_address = string;
1084 break;
Chuck Lever33832032007-12-10 14:59:13 -05001085 case Opt_mounthost:
1086 string = match_strdup(args);
1087 if (string == NULL)
1088 goto out_nomem;
Chuck Leverfc601472008-01-16 16:38:10 -05001089 kfree(mnt->mount_server.hostname);
Chuck Lever33832032007-12-10 14:59:13 -05001090 mnt->mount_server.hostname = string;
1091 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001092 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001093 string = match_strdup(args);
1094 if (string == NULL)
1095 goto out_nomem;
Chuck Lever9412b922007-12-10 14:59:21 -05001096 nfs_parse_server_address(string, (struct sockaddr *)
Chuck Lever4c568012007-12-10 14:59:28 -05001097 &mnt->mount_server.address,
1098 &mnt->mount_server.addrlen);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001099 kfree(string);
1100 break;
1101
1102 case Opt_userspace:
1103 case Opt_deprecated:
1104 break;
1105
1106 default:
1107 goto out_unknown;
1108 }
1109 }
1110
Chuck Leverf22d6d72008-03-14 14:10:22 -04001111 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1112 mnt->nfs_server.port);
Chuck Lever04dcd6e2007-12-10 14:57:53 -05001113
Chuck Leverbf0fd762007-07-01 12:13:44 -04001114 return 1;
1115
1116out_nomem:
1117 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1118 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001119out_security_failure:
1120 free_secdata(secdata);
1121 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1122 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001123out_unrec_vers:
1124 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1125 return 0;
1126
1127out_unrec_xprt:
1128 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1129 return 0;
1130
1131out_unrec_sec:
1132 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1133 return 0;
1134
1135out_unknown:
1136 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1137 return 0;
1138}
1139
1140/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001141 * Use the remote server's MOUNT service to request the NFS file handle
1142 * corresponding to the provided path.
1143 */
1144static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1145 struct nfs_fh *root_fh)
1146{
Chuck Lever4c568012007-12-10 14:59:28 -05001147 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
Chuck Lever33832032007-12-10 14:59:13 -05001148 char *hostname;
Chuck Lever4c568012007-12-10 14:59:28 -05001149 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001150
1151 if (args->mount_server.version == 0) {
1152 if (args->flags & NFS_MOUNT_VER3)
1153 args->mount_server.version = NFS_MNT3_VERSION;
1154 else
1155 args->mount_server.version = NFS_MNT_VERSION;
1156 }
1157
Chuck Lever33832032007-12-10 14:59:13 -05001158 if (args->mount_server.hostname)
1159 hostname = args->mount_server.hostname;
1160 else
1161 hostname = args->nfs_server.hostname;
1162
Chuck Lever0076d7b2007-07-01 12:13:49 -04001163 /*
1164 * Construct the mount server's address.
1165 */
Chuck Lever4c568012007-12-10 14:59:28 -05001166 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1167 memcpy(sap, &args->nfs_server.address,
1168 args->nfs_server.addrlen);
1169 args->mount_server.addrlen = args->nfs_server.addrlen;
1170 }
1171
James Lentiniaad70002007-09-24 17:32:49 -04001172 /*
1173 * autobind will be used if mount_server.port == 0
1174 */
Chuck Lever4c568012007-12-10 14:59:28 -05001175 nfs_set_port(sap, args->mount_server.port);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001176
1177 /*
1178 * Now ask the mount server to map our export path
1179 * to a file handle.
1180 */
Chuck Lever4c568012007-12-10 14:59:28 -05001181 status = nfs_mount(sap,
1182 args->mount_server.addrlen,
Chuck Lever33832032007-12-10 14:59:13 -05001183 hostname,
Chuck Lever0076d7b2007-07-01 12:13:49 -04001184 args->nfs_server.export_path,
1185 args->mount_server.version,
1186 args->mount_server.protocol,
1187 root_fh);
Chuck Leverefd83402007-09-11 18:00:58 -04001188 if (status == 0)
1189 return 0;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001190
Chuck Lever33832032007-12-10 14:59:13 -05001191 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1192 hostname, status);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001193 return status;
1194}
1195
1196/*
David Howells54ceac42006-08-22 20:06:13 -04001197 * Validate the NFS2/NFS3 mount data
1198 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001199 *
1200 * For option strings, user space handles the following behaviors:
1201 *
1202 * + DNS: mapping server host name to IP address ("addr=" option)
1203 *
1204 * + failure mode: how to behave if a mount request can't be handled
1205 * immediately ("fg/bg" option)
1206 *
1207 * + retry: how often to retry a mount request ("retry=" option)
1208 *
1209 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1210 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001211 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001212static int nfs_validate_mount_data(void *options,
1213 struct nfs_parsed_mount_data *args,
Chuck Lever136d5582007-07-01 12:13:54 -04001214 struct nfs_fh *mntfh,
1215 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001216{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001217 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever136d5582007-07-01 12:13:54 -04001218
Russell Kingf16c9602007-11-16 22:13:24 +00001219 memset(args, 0, sizeof(*args));
1220
Chuck Lever5df36e72007-07-01 12:12:56 -04001221 if (data == NULL)
1222 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001223
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001224 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1225 args->rsize = NFS_MAX_FILE_IO_SIZE;
1226 args->wsize = NFS_MAX_FILE_IO_SIZE;
1227 args->timeo = 600;
1228 args->retrans = 2;
1229 args->acregmin = 3;
1230 args->acregmax = 60;
1231 args->acdirmin = 30;
1232 args->acdirmax = 60;
Chuck Leverf22d6d72008-03-14 14:10:22 -04001233 args->mount_server.port = 0; /* autobind unless user sets port */
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001234 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverf22d6d72008-03-14 14:10:22 -04001235 args->nfs_server.port = 0; /* autobind unless user sets port */
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001236 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001237
David Howellsf7b422b2006-06-09 09:34:33 -04001238 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001239 case 1:
1240 data->namlen = 0;
1241 case 2:
1242 data->bsize = 0;
1243 case 3:
1244 if (data->flags & NFS_MOUNT_VER3)
1245 goto out_no_v3;
1246 data->root.size = NFS2_FHSIZE;
1247 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1248 case 4:
1249 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1250 goto out_no_sec;
1251 case 5:
1252 memset(data->context, 0, sizeof(data->context));
1253 case 6:
1254 if (data->flags & NFS_MOUNT_VER3)
1255 mntfh->size = data->root.size;
1256 else
1257 mntfh->size = NFS2_FHSIZE;
1258
1259 if (mntfh->size > sizeof(mntfh->data))
1260 goto out_invalid_fh;
1261
1262 memcpy(mntfh->data, data->root.data, mntfh->size);
1263 if (mntfh->size < sizeof(mntfh->data))
1264 memset(mntfh->data + mntfh->size, 0,
1265 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001266
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001267 /*
1268 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1269 * can deal with.
1270 */
1271 args->flags = data->flags;
1272 args->rsize = data->rsize;
1273 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001274 args->timeo = data->timeo;
1275 args->retrans = data->retrans;
1276 args->acregmin = data->acregmin;
1277 args->acregmax = data->acregmax;
1278 args->acdirmin = data->acdirmin;
1279 args->acdirmax = data->acdirmax;
Chuck Lever4c568012007-12-10 14:59:28 -05001280
1281 memcpy(&args->nfs_server.address, &data->addr,
1282 sizeof(data->addr));
1283 args->nfs_server.addrlen = sizeof(data->addr);
1284 if (!nfs_verify_server_address((struct sockaddr *)
1285 &args->nfs_server.address))
1286 goto out_no_address;
1287
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001288 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001289 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001290 /* N.B. caller will free nfs_server.hostname in all cases */
1291 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1292 args->namlen = data->namlen;
1293 args->bsize = data->bsize;
1294 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001295 if (!args->nfs_server.hostname)
1296 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001297
1298 /*
1299 * The legacy version 6 binary mount data from userspace has a
1300 * field used only to transport selinux information into the
1301 * the kernel. To continue to support that functionality we
1302 * have a touch of selinux knowledge here in the NFS code. The
1303 * userspace code converted context=blah to just blah so we are
1304 * converting back to the full string selinux understands.
1305 */
1306 if (data->context[0]){
1307#ifdef CONFIG_SECURITY_SELINUX
1308 int rc;
1309 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1310 if (!opts_str)
1311 return -ENOMEM;
1312 strcpy(opts_str, "context=");
1313 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1314 strcat(opts_str, &data->context[0]);
1315 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1316 kfree(opts_str);
1317 if (rc)
1318 return rc;
1319#else
1320 return -EINVAL;
1321#endif
1322 }
1323
Chuck Lever5df36e72007-07-01 12:12:56 -04001324 break;
Chuck Lever136d5582007-07-01 12:13:54 -04001325 default: {
1326 unsigned int len;
1327 char *c;
1328 int status;
Chuck Lever136d5582007-07-01 12:13:54 -04001329
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001330 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever136d5582007-07-01 12:13:54 -04001331 return -EINVAL;
1332
Chuck Lever6e88e062007-09-24 15:39:50 -04001333 if (!nfs_verify_server_address((struct sockaddr *)
1334 &args->nfs_server.address))
1335 goto out_no_address;
1336
Chuck Lever136d5582007-07-01 12:13:54 -04001337 c = strchr(dev_name, ':');
1338 if (c == NULL)
1339 return -EINVAL;
Chuck Lever350c73a2007-08-29 17:59:01 -04001340 len = c - dev_name;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001341 /* N.B. caller will free nfs_server.hostname in all cases */
1342 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001343 if (!args->nfs_server.hostname)
1344 goto out_nomem;
Chuck Lever136d5582007-07-01 12:13:54 -04001345
1346 c++;
1347 if (strlen(c) > NFS_MAXPATHLEN)
Chuck Lever7d1cca722007-08-29 17:59:03 -04001348 return -ENAMETOOLONG;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001349 args->nfs_server.export_path = c;
Chuck Lever136d5582007-07-01 12:13:54 -04001350
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001351 status = nfs_try_mount(args, mntfh);
Chuck Lever136d5582007-07-01 12:13:54 -04001352 if (status)
Chuck Leverfdc6e2c2007-08-29 17:58:59 -04001353 return status;
Chuck Lever136d5582007-07-01 12:13:54 -04001354
Chuck Lever136d5582007-07-01 12:13:54 -04001355 break;
1356 }
David Howellsf7b422b2006-06-09 09:34:33 -04001357 }
David Howells54ceac42006-08-22 20:06:13 -04001358
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001359 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1360 args->auth_flavors[0] = RPC_AUTH_UNIX;
Trond Myklebust36b15c52006-08-22 20:06:14 -04001361
David Howellsf7b422b2006-06-09 09:34:33 -04001362#ifndef CONFIG_NFS_V3
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001363 if (args->flags & NFS_MOUNT_VER3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001364 goto out_v3_not_compiled;
1365#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001366
David Howells54ceac42006-08-22 20:06:13 -04001367 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04001368
1369out_no_data:
1370 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1371 return -EINVAL;
1372
1373out_no_v3:
1374 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1375 data->version);
1376 return -EINVAL;
1377
1378out_no_sec:
1379 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1380 return -EINVAL;
1381
Chuck Lever5df36e72007-07-01 12:12:56 -04001382#ifndef CONFIG_NFS_V3
1383out_v3_not_compiled:
1384 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1385 return -EPROTONOSUPPORT;
1386#endif /* !CONFIG_NFS_V3 */
1387
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001388out_nomem:
1389 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1390 return -ENOMEM;
1391
Chuck Lever5df36e72007-07-01 12:12:56 -04001392out_no_address:
1393 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1394 return -EINVAL;
1395
1396out_invalid_fh:
1397 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1398 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04001399}
1400
1401/*
1402 * Initialise the common bits of the superblock
1403 */
1404static inline void nfs_initialise_sb(struct super_block *sb)
1405{
1406 struct nfs_server *server = NFS_SB(sb);
1407
1408 sb->s_magic = NFS_SUPER_MAGIC;
1409
1410 /* We probably want something more informative here */
1411 snprintf(sb->s_id, sizeof(sb->s_id),
1412 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1413
1414 if (sb->s_blocksize == 0)
1415 sb->s_blocksize = nfs_block_bits(server->wsize,
1416 &sb->s_blocksize_bits);
1417
1418 if (server->flags & NFS_MOUNT_NOAC)
1419 sb->s_flags |= MS_SYNCHRONOUS;
1420
1421 nfs_super_set_maxbytes(sb, server->maxfilesize);
1422}
1423
1424/*
1425 * Finish setting up an NFS2/3 superblock
1426 */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001427static void nfs_fill_super(struct super_block *sb,
1428 struct nfs_parsed_mount_data *data)
David Howells54ceac42006-08-22 20:06:13 -04001429{
1430 struct nfs_server *server = NFS_SB(sb);
1431
1432 sb->s_blocksize_bits = 0;
1433 sb->s_blocksize = 0;
1434 if (data->bsize)
1435 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1436
1437 if (server->flags & NFS_MOUNT_VER3) {
1438 /* The VFS shouldn't apply the umask to mode bits. We will do
1439 * so ourselves when necessary.
1440 */
1441 sb->s_flags |= MS_POSIXACL;
1442 sb->s_time_gran = 1;
1443 }
1444
1445 sb->s_op = &nfs_sops;
1446 nfs_initialise_sb(sb);
1447}
1448
1449/*
1450 * Finish setting up a cloned NFS2/3 superblock
1451 */
1452static void nfs_clone_super(struct super_block *sb,
1453 const struct super_block *old_sb)
1454{
1455 struct nfs_server *server = NFS_SB(sb);
1456
1457 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1458 sb->s_blocksize = old_sb->s_blocksize;
1459 sb->s_maxbytes = old_sb->s_maxbytes;
1460
1461 if (server->flags & NFS_MOUNT_VER3) {
1462 /* The VFS shouldn't apply the umask to mode bits. We will do
1463 * so ourselves when necessary.
1464 */
1465 sb->s_flags |= MS_POSIXACL;
1466 sb->s_time_gran = 1;
1467 }
1468
1469 sb->s_op = old_sb->s_op;
1470 nfs_initialise_sb(sb);
1471}
1472
Trond Myklebust275a5d22007-05-16 16:53:28 -04001473#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1474
1475static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1476{
1477 const struct nfs_server *a = s->s_fs_info;
1478 const struct rpc_clnt *clnt_a = a->client;
1479 const struct rpc_clnt *clnt_b = b->client;
1480
1481 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1482 goto Ebusy;
1483 if (a->nfs_client != b->nfs_client)
1484 goto Ebusy;
1485 if (a->flags != b->flags)
1486 goto Ebusy;
1487 if (a->wsize != b->wsize)
1488 goto Ebusy;
1489 if (a->rsize != b->rsize)
1490 goto Ebusy;
1491 if (a->acregmin != b->acregmin)
1492 goto Ebusy;
1493 if (a->acregmax != b->acregmax)
1494 goto Ebusy;
1495 if (a->acdirmin != b->acdirmin)
1496 goto Ebusy;
1497 if (a->acdirmax != b->acdirmax)
1498 goto Ebusy;
1499 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1500 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001501 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04001502Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001503 return 0;
1504}
1505
1506struct nfs_sb_mountdata {
1507 struct nfs_server *server;
1508 int mntflags;
1509};
1510
1511static int nfs_set_super(struct super_block *s, void *data)
1512{
1513 struct nfs_sb_mountdata *sb_mntdata = data;
1514 struct nfs_server *server = sb_mntdata->server;
1515 int ret;
1516
1517 s->s_flags = sb_mntdata->mntflags;
1518 s->s_fs_info = server;
1519 ret = set_anon_super(s, server);
1520 if (ret == 0)
1521 server->s_dev = s->s_dev;
1522 return ret;
1523}
1524
Chuck Leverfd00a8f2007-12-10 14:57:38 -05001525static int nfs_compare_super_address(struct nfs_server *server1,
1526 struct nfs_server *server2)
1527{
1528 struct sockaddr *sap1, *sap2;
1529
1530 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1531 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1532
1533 if (sap1->sa_family != sap2->sa_family)
1534 return 0;
1535
1536 switch (sap1->sa_family) {
1537 case AF_INET: {
1538 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1539 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1540 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1541 return 0;
1542 if (sin1->sin_port != sin2->sin_port)
1543 return 0;
1544 break;
1545 }
1546 case AF_INET6: {
1547 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1548 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1549 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1550 return 0;
1551 if (sin1->sin6_port != sin2->sin6_port)
1552 return 0;
1553 break;
1554 }
1555 default:
1556 return 0;
1557 }
1558
1559 return 1;
1560}
1561
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001562static int nfs_compare_super(struct super_block *sb, void *data)
1563{
1564 struct nfs_sb_mountdata *sb_mntdata = data;
1565 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1566 int mntflags = sb_mntdata->mntflags;
1567
Chuck Leverfd00a8f2007-12-10 14:57:38 -05001568 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001569 return 0;
1570 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1571 if (old->flags & NFS_MOUNT_UNSHARED)
1572 return 0;
1573 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1574 return 0;
1575 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04001576}
1577
Miklos Szeredifa799752008-04-30 00:54:33 -07001578static int nfs_bdi_register(struct nfs_server *server)
1579{
1580 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1581}
1582
David Howells54ceac42006-08-22 20:06:13 -04001583static int nfs_get_sb(struct file_system_type *fs_type,
1584 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1585{
1586 struct nfs_server *server = NULL;
1587 struct super_block *s;
1588 struct nfs_fh mntfh;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001589 struct nfs_parsed_mount_data data;
David Howells54ceac42006-08-22 20:06:13 -04001590 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04001591 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001592 struct nfs_sb_mountdata sb_mntdata = {
1593 .mntflags = flags,
1594 };
David Howells54ceac42006-08-22 20:06:13 -04001595 int error;
1596
Eric Parisf9c3a382008-03-05 14:20:18 -05001597 security_init_mnt_opts(&data.lsm_opts);
1598
David Howells54ceac42006-08-22 20:06:13 -04001599 /* Validate the mount data */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001600 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
David Howells54ceac42006-08-22 20:06:13 -04001601 if (error < 0)
Chuck Lever06559602007-07-01 12:12:35 -04001602 goto out;
David Howells54ceac42006-08-22 20:06:13 -04001603
1604 /* Get a volume representation */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001605 server = nfs_create_server(&data, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04001606 if (IS_ERR(server)) {
1607 error = PTR_ERR(server);
Chuck Lever06559602007-07-01 12:12:35 -04001608 goto out;
David Howells54ceac42006-08-22 20:06:13 -04001609 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001610 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04001611
Trond Myklebust75180df2007-05-16 16:53:28 -04001612 if (server->flags & NFS_MOUNT_UNSHARED)
1613 compare_super = NULL;
1614
David Howells54ceac42006-08-22 20:06:13 -04001615 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001616 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04001617 if (IS_ERR(s)) {
1618 error = PTR_ERR(s);
David Howells54ceac42006-08-22 20:06:13 -04001619 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04001620 }
1621
David Howells54ceac42006-08-22 20:06:13 -04001622 if (s->s_fs_info != server) {
1623 nfs_free_server(server);
1624 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07001625 } else {
1626 error = nfs_bdi_register(server);
1627 if (error)
1628 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04001629 }
David Howells54ceac42006-08-22 20:06:13 -04001630
1631 if (!s->s_root) {
1632 /* initial superblock/root creation */
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001633 nfs_fill_super(s, &data);
David Howells54ceac42006-08-22 20:06:13 -04001634 }
1635
1636 mntroot = nfs_get_root(s, &mntfh);
1637 if (IS_ERR(mntroot)) {
1638 error = PTR_ERR(mntroot);
1639 goto error_splat_super;
1640 }
1641
Eric Parisf9c3a382008-03-05 14:20:18 -05001642 error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1643 if (error)
1644 goto error_splat_root;
1645
David Howellsf7b422b2006-06-09 09:34:33 -04001646 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04001647 mnt->mnt_sb = s;
1648 mnt->mnt_root = mntroot;
Chuck Lever06559602007-07-01 12:12:35 -04001649 error = 0;
1650
1651out:
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001652 kfree(data.nfs_server.hostname);
Chuck Lever33832032007-12-10 14:59:13 -05001653 kfree(data.mount_server.hostname);
Eric Parisf9c3a382008-03-05 14:20:18 -05001654 security_free_mnt_opts(&data.lsm_opts);
Chuck Lever06559602007-07-01 12:12:35 -04001655 return error;
Trond Myklebust816724e2006-06-24 08:41:41 -04001656
David Howells54ceac42006-08-22 20:06:13 -04001657out_err_nosb:
1658 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04001659 goto out;
David Howells54ceac42006-08-22 20:06:13 -04001660
Eric Parisf9c3a382008-03-05 14:20:18 -05001661error_splat_root:
1662 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04001663error_splat_super:
1664 up_write(&s->s_umount);
1665 deactivate_super(s);
Chuck Lever06559602007-07-01 12:12:35 -04001666 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04001667}
1668
David Howells54ceac42006-08-22 20:06:13 -04001669/*
1670 * Destroy an NFS2/3 superblock
1671 */
David Howellsf7b422b2006-06-09 09:34:33 -04001672static void nfs_kill_super(struct super_block *s)
1673{
1674 struct nfs_server *server = NFS_SB(s);
1675
Miklos Szeredifa799752008-04-30 00:54:33 -07001676 bdi_unregister(&server->backing_dev_info);
David Howellsf7b422b2006-06-09 09:34:33 -04001677 kill_anon_super(s);
David Howells54ceac42006-08-22 20:06:13 -04001678 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04001679}
1680
David Howells54ceac42006-08-22 20:06:13 -04001681/*
1682 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1683 */
1684static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1685 const char *dev_name, void *raw_data,
1686 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04001687{
1688 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04001689 struct super_block *s;
1690 struct nfs_server *server;
1691 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04001692 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001693 struct nfs_sb_mountdata sb_mntdata = {
1694 .mntflags = flags,
1695 };
David Howells54ceac42006-08-22 20:06:13 -04001696 int error;
1697
1698 dprintk("--> nfs_xdev_get_sb()\n");
1699
1700 /* create a new volume representation */
1701 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1702 if (IS_ERR(server)) {
1703 error = PTR_ERR(server);
1704 goto out_err_noserver;
1705 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001706 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04001707
Trond Myklebust75180df2007-05-16 16:53:28 -04001708 if (server->flags & NFS_MOUNT_UNSHARED)
1709 compare_super = NULL;
1710
David Howells54ceac42006-08-22 20:06:13 -04001711 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001712 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04001713 if (IS_ERR(s)) {
1714 error = PTR_ERR(s);
1715 goto out_err_nosb;
1716 }
1717
1718 if (s->s_fs_info != server) {
1719 nfs_free_server(server);
1720 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07001721 } else {
1722 error = nfs_bdi_register(server);
1723 if (error)
1724 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04001725 }
1726
1727 if (!s->s_root) {
1728 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04001729 nfs_clone_super(s, data->sb);
1730 }
1731
1732 mntroot = nfs_get_root(s, data->fh);
1733 if (IS_ERR(mntroot)) {
1734 error = PTR_ERR(mntroot);
1735 goto error_splat_super;
1736 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05001737 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
Neil Brown4c1fe2f2007-11-01 16:50:20 +11001738 dput(mntroot);
1739 error = -ESTALE;
1740 goto error_splat_super;
1741 }
David Howells54ceac42006-08-22 20:06:13 -04001742
1743 s->s_flags |= MS_ACTIVE;
1744 mnt->mnt_sb = s;
1745 mnt->mnt_root = mntroot;
1746
Eric Parisf9c3a382008-03-05 14:20:18 -05001747 /* clone any lsm security options from the parent to the new sb */
1748 security_sb_clone_mnt_opts(data->sb, s);
1749
David Howells54ceac42006-08-22 20:06:13 -04001750 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1751 return 0;
1752
1753out_err_nosb:
1754 nfs_free_server(server);
1755out_err_noserver:
1756 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1757 return error;
1758
1759error_splat_super:
1760 up_write(&s->s_umount);
1761 deactivate_super(s);
1762 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1763 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04001764}
1765
1766#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -04001767
1768/*
1769 * Finish setting up a cloned NFS4 superblock
1770 */
1771static void nfs4_clone_super(struct super_block *sb,
1772 const struct super_block *old_sb)
David Howellsf7b422b2006-06-09 09:34:33 -04001773{
David Howells54ceac42006-08-22 20:06:13 -04001774 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1775 sb->s_blocksize = old_sb->s_blocksize;
1776 sb->s_maxbytes = old_sb->s_maxbytes;
1777 sb->s_time_gran = 1;
1778 sb->s_op = old_sb->s_op;
1779 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04001780}
1781
1782/*
1783 * Set up an NFS4 superblock
1784 */
David Howells54ceac42006-08-22 20:06:13 -04001785static void nfs4_fill_super(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -04001786{
David Howellsf7b422b2006-06-09 09:34:33 -04001787 sb->s_time_gran = 1;
David Howellsf7b422b2006-06-09 09:34:33 -04001788 sb->s_op = &nfs4_sops;
David Howells54ceac42006-08-22 20:06:13 -04001789 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -04001790}
1791
David Howells54ceac42006-08-22 20:06:13 -04001792/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04001793 * Validate NFSv4 mount options
1794 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001795static int nfs4_validate_mount_data(void *options,
1796 struct nfs_parsed_mount_data *args,
1797 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04001798{
Chuck Lever4c568012007-12-10 14:59:28 -05001799 struct sockaddr_in *ap;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001800 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04001801 char *c;
1802
Russell Kingf16c9602007-11-16 22:13:24 +00001803 memset(args, 0, sizeof(*args));
1804
Chuck Leverf0768eb2007-07-01 12:13:01 -04001805 if (data == NULL)
1806 goto out_no_data;
1807
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001808 args->rsize = NFS_MAX_FILE_IO_SIZE;
1809 args->wsize = NFS_MAX_FILE_IO_SIZE;
1810 args->timeo = 600;
1811 args->retrans = 2;
1812 args->acregmin = 3;
1813 args->acregmax = 60;
1814 args->acdirmin = 30;
1815 args->acdirmax = 60;
Chuck Leverf22d6d72008-03-14 14:10:22 -04001816 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001817 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001818
Chuck Leverf0768eb2007-07-01 12:13:01 -04001819 switch (data->version) {
1820 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05001821 ap = (struct sockaddr_in *)&args->nfs_server.address;
1822 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04001823 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05001824 if (data->host_addrlen == 0)
1825 goto out_no_address;
1826 args->nfs_server.addrlen = data->host_addrlen;
1827 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04001828 return -EFAULT;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001829 if (!nfs_verify_server_address((struct sockaddr *)
1830 &args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04001831 goto out_no_address;
1832
1833 switch (data->auth_flavourlen) {
1834 case 0:
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001835 args->auth_flavors[0] = RPC_AUTH_UNIX;
Chuck Leverf0768eb2007-07-01 12:13:01 -04001836 break;
1837 case 1:
Trond Myklebust20c71f52007-09-20 20:23:51 -04001838 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001839 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04001840 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04001841 return -EFAULT;
1842 break;
1843 default:
1844 goto out_inval_auth;
1845 }
1846
1847 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1848 if (IS_ERR(c))
1849 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001850 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04001851
1852 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1853 if (IS_ERR(c))
1854 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001855 args->nfs_server.export_path = c;
1856 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04001857
1858 c = strndup_user(data->client_addr.data, 16);
1859 if (IS_ERR(c))
1860 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001861 args->client_address = c;
1862
1863 /*
1864 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1865 * can deal with.
1866 */
1867
1868 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1869 args->rsize = data->rsize;
1870 args->wsize = data->wsize;
1871 args->timeo = data->timeo;
1872 args->retrans = data->retrans;
1873 args->acregmin = data->acregmin;
1874 args->acregmax = data->acregmax;
1875 args->acdirmin = data->acdirmin;
1876 args->acdirmax = data->acdirmax;
1877 args->nfs_server.protocol = data->proto;
Chuck Leverf0768eb2007-07-01 12:13:01 -04001878
1879 break;
Chuck Lever80071222007-07-01 12:13:59 -04001880 default: {
1881 unsigned int len;
Chuck Lever80071222007-07-01 12:13:59 -04001882
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001883 if (nfs_parse_mount_options((char *)options, args) == 0)
Chuck Lever80071222007-07-01 12:13:59 -04001884 return -EINVAL;
1885
1886 if (!nfs_verify_server_address((struct sockaddr *)
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001887 &args->nfs_server.address))
Chuck Lever80071222007-07-01 12:13:59 -04001888 return -EINVAL;
Chuck Lever80071222007-07-01 12:13:59 -04001889
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001890 switch (args->auth_flavor_len) {
Chuck Lever80071222007-07-01 12:13:59 -04001891 case 0:
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001892 args->auth_flavors[0] = RPC_AUTH_UNIX;
Chuck Lever80071222007-07-01 12:13:59 -04001893 break;
1894 case 1:
Chuck Lever80071222007-07-01 12:13:59 -04001895 break;
1896 default:
1897 goto out_inval_auth;
1898 }
1899
1900 /*
Chuck Lever80071222007-07-01 12:13:59 -04001901 * Split "dev_name" into "hostname:mntpath".
1902 */
1903 c = strchr(dev_name, ':');
1904 if (c == NULL)
1905 return -EINVAL;
1906 /* while calculating len, pretend ':' is '\0' */
1907 len = c - dev_name;
1908 if (len > NFS4_MAXNAMLEN)
Chuck Lever7d1cca722007-08-29 17:59:03 -04001909 return -ENAMETOOLONG;
Chuck Lever6a0ed1d2007-10-26 13:32:40 -04001910 /* N.B. caller will free nfs_server.hostname in all cases */
1911 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001912 if (!args->nfs_server.hostname)
1913 goto out_nomem;
Chuck Lever80071222007-07-01 12:13:59 -04001914
1915 c++; /* step over the ':' */
1916 len = strlen(c);
1917 if (len > NFS4_MAXPATHLEN)
Chuck Lever7d1cca722007-08-29 17:59:03 -04001918 return -ENAMETOOLONG;
Chuck Lever6a0ed1d2007-10-26 13:32:40 -04001919 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001920 if (!args->nfs_server.export_path)
1921 goto out_nomem;
Chuck Lever80071222007-07-01 12:13:59 -04001922
Chuck Lever6a0ed1d2007-10-26 13:32:40 -04001923 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
Chuck Lever80071222007-07-01 12:13:59 -04001924
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001925 if (args->client_address == NULL)
Jeff Layton0a87cf12007-07-18 11:28:43 -04001926 goto out_no_client_address;
1927
Chuck Lever80071222007-07-01 12:13:59 -04001928 break;
1929 }
Chuck Leverf0768eb2007-07-01 12:13:01 -04001930 }
1931
1932 return 0;
1933
1934out_no_data:
1935 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1936 return -EINVAL;
1937
1938out_inval_auth:
1939 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1940 data->auth_flavourlen);
1941 return -EINVAL;
1942
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001943out_nomem:
1944 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1945 return -ENOMEM;
1946
Chuck Leverf0768eb2007-07-01 12:13:01 -04001947out_no_address:
1948 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1949 return -EINVAL;
Jeff Layton0a87cf12007-07-18 11:28:43 -04001950
1951out_no_client_address:
1952 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1953 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04001954}
1955
1956/*
David Howells54ceac42006-08-22 20:06:13 -04001957 * Get the superblock for an NFS4 mountpoint
1958 */
Trond Myklebust816724e2006-06-24 08:41:41 -04001959static int nfs4_get_sb(struct file_system_type *fs_type,
1960 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04001961{
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001962 struct nfs_parsed_mount_data data;
David Howells54ceac42006-08-22 20:06:13 -04001963 struct super_block *s;
1964 struct nfs_server *server;
David Howells54ceac42006-08-22 20:06:13 -04001965 struct nfs_fh mntfh;
1966 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04001967 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001968 struct nfs_sb_mountdata sb_mntdata = {
1969 .mntflags = flags,
1970 };
David Howells54ceac42006-08-22 20:06:13 -04001971 int error;
David Howellsf7b422b2006-06-09 09:34:33 -04001972
Eric Parisf9c3a382008-03-05 14:20:18 -05001973 security_init_mnt_opts(&data.lsm_opts);
1974
Chuck Leverf0768eb2007-07-01 12:13:01 -04001975 /* Validate the mount data */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001976 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
Chuck Leverf0768eb2007-07-01 12:13:01 -04001977 if (error < 0)
1978 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04001979
David Howells54ceac42006-08-22 20:06:13 -04001980 /* Get a volume representation */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04001981 server = nfs4_create_server(&data, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04001982 if (IS_ERR(server)) {
1983 error = PTR_ERR(server);
Chuck Lever29eb9812007-07-01 12:12:30 -04001984 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04001985 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001986 sb_mntdata.server = server;
David Howellsf7b422b2006-06-09 09:34:33 -04001987
Trond Myklebust75180df2007-05-16 16:53:28 -04001988 if (server->flags & NFS4_MOUNT_UNSHARED)
1989 compare_super = NULL;
1990
David Howells54ceac42006-08-22 20:06:13 -04001991 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04001992 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04001993 if (IS_ERR(s)) {
1994 error = PTR_ERR(s);
David Howellsf7b422b2006-06-09 09:34:33 -04001995 goto out_free;
Trond Myklebust816724e2006-06-24 08:41:41 -04001996 }
1997
Trond Myklebust5dd31772006-08-24 01:03:05 -04001998 if (s->s_fs_info != server) {
1999 nfs_free_server(server);
2000 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002001 } else {
2002 error = nfs_bdi_register(server);
2003 if (error)
2004 goto error_splat_super;
Trond Myklebust5dd31772006-08-24 01:03:05 -04002005 }
2006
David Howells54ceac42006-08-22 20:06:13 -04002007 if (!s->s_root) {
2008 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002009 nfs4_fill_super(s);
Trond Myklebust816724e2006-06-24 08:41:41 -04002010 }
David Howellsf7b422b2006-06-09 09:34:33 -04002011
David Howells54ceac42006-08-22 20:06:13 -04002012 mntroot = nfs4_get_root(s, &mntfh);
2013 if (IS_ERR(mntroot)) {
2014 error = PTR_ERR(mntroot);
2015 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -04002016 }
David Howells54ceac42006-08-22 20:06:13 -04002017
Eric Paris46c8ac72008-05-02 13:42:42 -07002018 error = security_sb_set_mnt_opts(s, &data.lsm_opts);
2019 if (error)
2020 goto error_splat_root;
2021
David Howellsf7b422b2006-06-09 09:34:33 -04002022 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -04002023 mnt->mnt_sb = s;
2024 mnt->mnt_root = mntroot;
Chuck Lever29eb9812007-07-01 12:12:30 -04002025 error = 0;
David Howells54ceac42006-08-22 20:06:13 -04002026
Chuck Lever29eb9812007-07-01 12:12:30 -04002027out:
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002028 kfree(data.client_address);
2029 kfree(data.nfs_server.export_path);
2030 kfree(data.nfs_server.hostname);
Eric Parisf9c3a382008-03-05 14:20:18 -05002031 security_free_mnt_opts(&data.lsm_opts);
Trond Myklebust816724e2006-06-24 08:41:41 -04002032 return error;
David Howells54ceac42006-08-22 20:06:13 -04002033
Chuck Lever29eb9812007-07-01 12:12:30 -04002034out_free:
2035 nfs_free_server(server);
2036 goto out;
2037
Eric Paris46c8ac72008-05-02 13:42:42 -07002038error_splat_root:
2039 dput(mntroot);
David Howells54ceac42006-08-22 20:06:13 -04002040error_splat_super:
2041 up_write(&s->s_umount);
2042 deactivate_super(s);
Chuck Lever29eb9812007-07-01 12:12:30 -04002043 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002044}
2045
2046static void nfs4_kill_super(struct super_block *sb)
2047{
2048 struct nfs_server *server = NFS_SB(sb);
2049
2050 nfs_return_all_delegations(sb);
2051 kill_anon_super(sb);
2052
2053 nfs4_renewd_prepare_shutdown(server);
David Howells54ceac42006-08-22 20:06:13 -04002054 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002055}
2056
2057/*
David Howells54ceac42006-08-22 20:06:13 -04002058 * Clone an NFS4 server record on xdev traversal (FSID-change)
David Howellsf7b422b2006-06-09 09:34:33 -04002059 */
David Howells54ceac42006-08-22 20:06:13 -04002060static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2061 const char *dev_name, void *raw_data,
2062 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002063{
2064 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002065 struct super_block *s;
2066 struct nfs_server *server;
2067 struct dentry *mntroot;
Trond Myklebust75180df2007-05-16 16:53:28 -04002068 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002069 struct nfs_sb_mountdata sb_mntdata = {
2070 .mntflags = flags,
2071 };
David Howells54ceac42006-08-22 20:06:13 -04002072 int error;
2073
2074 dprintk("--> nfs4_xdev_get_sb()\n");
2075
2076 /* create a new volume representation */
2077 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2078 if (IS_ERR(server)) {
2079 error = PTR_ERR(server);
2080 goto out_err_noserver;
2081 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002082 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002083
Trond Myklebust75180df2007-05-16 16:53:28 -04002084 if (server->flags & NFS4_MOUNT_UNSHARED)
2085 compare_super = NULL;
2086
David Howells54ceac42006-08-22 20:06:13 -04002087 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002088 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002089 if (IS_ERR(s)) {
2090 error = PTR_ERR(s);
2091 goto out_err_nosb;
2092 }
2093
2094 if (s->s_fs_info != server) {
2095 nfs_free_server(server);
2096 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002097 } else {
2098 error = nfs_bdi_register(server);
2099 if (error)
2100 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002101 }
2102
2103 if (!s->s_root) {
2104 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002105 nfs4_clone_super(s, data->sb);
2106 }
2107
2108 mntroot = nfs4_get_root(s, data->fh);
2109 if (IS_ERR(mntroot)) {
2110 error = PTR_ERR(mntroot);
2111 goto error_splat_super;
2112 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002113 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2114 dput(mntroot);
2115 error = -ESTALE;
2116 goto error_splat_super;
2117 }
David Howells54ceac42006-08-22 20:06:13 -04002118
2119 s->s_flags |= MS_ACTIVE;
2120 mnt->mnt_sb = s;
2121 mnt->mnt_root = mntroot;
2122
Eric Paris46c8ac72008-05-02 13:42:42 -07002123 security_sb_clone_mnt_opts(data->sb, s);
2124
David Howells54ceac42006-08-22 20:06:13 -04002125 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2126 return 0;
2127
2128out_err_nosb:
2129 nfs_free_server(server);
2130out_err_noserver:
2131 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2132 return error;
2133
2134error_splat_super:
2135 up_write(&s->s_umount);
2136 deactivate_super(s);
2137 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2138 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002139}
2140
David Howells54ceac42006-08-22 20:06:13 -04002141/*
2142 * Create an NFS4 server record on referral traversal
2143 */
2144static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2145 const char *dev_name, void *raw_data,
2146 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04002147{
2148 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04002149 struct super_block *s;
2150 struct nfs_server *server;
2151 struct dentry *mntroot;
2152 struct nfs_fh mntfh;
Trond Myklebust75180df2007-05-16 16:53:28 -04002153 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002154 struct nfs_sb_mountdata sb_mntdata = {
2155 .mntflags = flags,
2156 };
David Howells54ceac42006-08-22 20:06:13 -04002157 int error;
2158
2159 dprintk("--> nfs4_referral_get_sb()\n");
2160
2161 /* create a new volume representation */
2162 server = nfs4_create_referral_server(data, &mntfh);
2163 if (IS_ERR(server)) {
2164 error = PTR_ERR(server);
2165 goto out_err_noserver;
2166 }
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002167 sb_mntdata.server = server;
David Howells54ceac42006-08-22 20:06:13 -04002168
Trond Myklebust75180df2007-05-16 16:53:28 -04002169 if (server->flags & NFS4_MOUNT_UNSHARED)
2170 compare_super = NULL;
2171
David Howells54ceac42006-08-22 20:06:13 -04002172 /* Get a superblock - note that we may end up sharing one that already exists */
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002173 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
David Howells54ceac42006-08-22 20:06:13 -04002174 if (IS_ERR(s)) {
2175 error = PTR_ERR(s);
2176 goto out_err_nosb;
2177 }
2178
2179 if (s->s_fs_info != server) {
2180 nfs_free_server(server);
2181 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002182 } else {
2183 error = nfs_bdi_register(server);
2184 if (error)
2185 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002186 }
2187
2188 if (!s->s_root) {
2189 /* initial superblock/root creation */
David Howells54ceac42006-08-22 20:06:13 -04002190 nfs4_fill_super(s);
2191 }
2192
Trond Myklebustf2d0d852007-02-02 14:46:09 -08002193 mntroot = nfs4_get_root(s, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04002194 if (IS_ERR(mntroot)) {
2195 error = PTR_ERR(mntroot);
2196 goto error_splat_super;
2197 }
Trond Myklebuste9cc6c22008-01-02 13:28:57 -05002198 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2199 dput(mntroot);
2200 error = -ESTALE;
2201 goto error_splat_super;
2202 }
David Howells54ceac42006-08-22 20:06:13 -04002203
2204 s->s_flags |= MS_ACTIVE;
2205 mnt->mnt_sb = s;
2206 mnt->mnt_root = mntroot;
2207
Eric Paris46c8ac72008-05-02 13:42:42 -07002208 security_sb_clone_mnt_opts(data->sb, s);
2209
David Howells54ceac42006-08-22 20:06:13 -04002210 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2211 return 0;
2212
2213out_err_nosb:
2214 nfs_free_server(server);
2215out_err_noserver:
2216 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2217 return error;
2218
2219error_splat_super:
2220 up_write(&s->s_umount);
2221 deactivate_super(s);
2222 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2223 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04002224}
2225
David Howells54ceac42006-08-22 20:06:13 -04002226#endif /* CONFIG_NFS_V4 */