Commit | Line | Data |
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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
526719ba | 8 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
f7b422b1 DH |
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 | * | |
54ceac45 DH |
16 | * - 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()) | |
f7b422b1 DH |
21 | */ |
22 | ||
f7b422b1 DH |
23 | #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> | |
0896a725 | 36 | #include <linux/sunrpc/xprtsock.h> |
2cf7ff7a | 37 | #include <linux/sunrpc/xprtrdma.h> |
f7b422b1 DH |
38 | #include <linux/nfs_fs.h> |
39 | #include <linux/nfs_mount.h> | |
40 | #include <linux/nfs4_mount.h> | |
41 | #include <linux/lockd/bind.h> | |
f7b422b1 DH |
42 | #include <linux/seq_file.h> |
43 | #include <linux/mount.h> | |
c02d7adf | 44 | #include <linux/namei.h> |
f7b422b1 DH |
45 | #include <linux/nfs_idmap.h> |
46 | #include <linux/vfs.h> | |
47 | #include <linux/inet.h> | |
fd00a8ff | 48 | #include <linux/in6.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
fd00a8ff | 50 | #include <net/ipv6.h> |
d8e7748a | 51 | #include <linux/netdevice.h> |
f7b422b1 | 52 | #include <linux/nfs_xdr.h> |
b5d5dfbd | 53 | #include <linux/magic.h> |
bf0fd768 | 54 | #include <linux/parser.h> |
e50a7a1a | 55 | #include <linux/nsproxy.h> |
2446ab60 | 56 | #include <linux/rcupdate.h> |
f7b422b1 | 57 | |
f7b422b1 DH |
58 | #include <asm/uaccess.h> |
59 | ||
60 | #include "nfs4_fs.h" | |
61 | #include "callback.h" | |
62 | #include "delegation.h" | |
63 | #include "iostat.h" | |
64 | #include "internal.h" | |
08734048 | 65 | #include "fscache.h" |
ae50c0b5 | 66 | #include "pnfs.h" |
f7b422b1 DH |
67 | |
68 | #define NFSDBG_FACILITY NFSDBG_VFS | |
69 | ||
1e657bd5 PZ |
70 | #ifdef CONFIG_NFS_V3 |
71 | #define NFS_DEFAULT_VERSION 3 | |
72 | #else | |
73 | #define NFS_DEFAULT_VERSION 2 | |
74 | #endif | |
75 | ||
bf0fd768 CL |
76 | enum { |
77 | /* Mount options that take no arguments */ | |
78 | Opt_soft, Opt_hard, | |
bf0fd768 CL |
79 | Opt_posix, Opt_noposix, |
80 | Opt_cto, Opt_nocto, | |
81 | Opt_ac, Opt_noac, | |
82 | Opt_lock, Opt_nolock, | |
2cf7ff7a | 83 | Opt_udp, Opt_tcp, Opt_rdma, |
bf0fd768 CL |
84 | Opt_acl, Opt_noacl, |
85 | Opt_rdirplus, Opt_nordirplus, | |
75180df2 | 86 | Opt_sharecache, Opt_nosharecache, |
d740351b | 87 | Opt_resvport, Opt_noresvport, |
b797cac7 | 88 | Opt_fscache, Opt_nofscache, |
bf0fd768 CL |
89 | |
90 | /* Mount options that take integer arguments */ | |
91 | Opt_port, | |
92 | Opt_rsize, Opt_wsize, Opt_bsize, | |
93 | Opt_timeo, Opt_retrans, | |
94 | Opt_acregmin, Opt_acregmax, | |
95 | Opt_acdirmin, Opt_acdirmax, | |
96 | Opt_actimeo, | |
97 | Opt_namelen, | |
98 | Opt_mountport, | |
e887cbcf | 99 | Opt_mountvers, |
3fd5be9e | 100 | Opt_minorversion, |
bf0fd768 CL |
101 | |
102 | /* Mount options that take string arguments */ | |
0d71b058 | 103 | Opt_nfsvers, |
33832034 | 104 | Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, |
0ac83779 | 105 | Opt_addr, Opt_mountaddr, Opt_clientaddr, |
7973c1f1 | 106 | Opt_lookupcache, |
b797cac7 | 107 | Opt_fscache_uniq, |
5eebde23 | 108 | Opt_local_lock, |
bf0fd768 | 109 | |
f45663ce CL |
110 | /* Special mount options */ |
111 | Opt_userspace, Opt_deprecated, Opt_sloppy, | |
bf0fd768 CL |
112 | |
113 | Opt_err | |
114 | }; | |
115 | ||
a447c093 | 116 | static const match_table_t nfs_mount_option_tokens = { |
bf0fd768 CL |
117 | { Opt_userspace, "bg" }, |
118 | { Opt_userspace, "fg" }, | |
ecbb3845 CL |
119 | { Opt_userspace, "retry=%s" }, |
120 | ||
f45663ce CL |
121 | { Opt_sloppy, "sloppy" }, |
122 | ||
bf0fd768 CL |
123 | { Opt_soft, "soft" }, |
124 | { Opt_hard, "hard" }, | |
d33e4dfe CL |
125 | { Opt_deprecated, "intr" }, |
126 | { Opt_deprecated, "nointr" }, | |
bf0fd768 CL |
127 | { Opt_posix, "posix" }, |
128 | { Opt_noposix, "noposix" }, | |
129 | { Opt_cto, "cto" }, | |
130 | { Opt_nocto, "nocto" }, | |
131 | { Opt_ac, "ac" }, | |
132 | { Opt_noac, "noac" }, | |
133 | { Opt_lock, "lock" }, | |
134 | { Opt_nolock, "nolock" }, | |
bf0fd768 CL |
135 | { Opt_udp, "udp" }, |
136 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 137 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
138 | { Opt_acl, "acl" }, |
139 | { Opt_noacl, "noacl" }, | |
140 | { Opt_rdirplus, "rdirplus" }, | |
141 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
142 | { Opt_sharecache, "sharecache" }, |
143 | { Opt_nosharecache, "nosharecache" }, | |
d740351b CL |
144 | { Opt_resvport, "resvport" }, |
145 | { Opt_noresvport, "noresvport" }, | |
b797cac7 | 146 | { Opt_fscache, "fsc" }, |
b797cac7 | 147 | { Opt_nofscache, "nofsc" }, |
bf0fd768 | 148 | |
a5a16bae CL |
149 | { Opt_port, "port=%s" }, |
150 | { Opt_rsize, "rsize=%s" }, | |
151 | { Opt_wsize, "wsize=%s" }, | |
152 | { Opt_bsize, "bsize=%s" }, | |
153 | { Opt_timeo, "timeo=%s" }, | |
154 | { Opt_retrans, "retrans=%s" }, | |
155 | { Opt_acregmin, "acregmin=%s" }, | |
156 | { Opt_acregmax, "acregmax=%s" }, | |
157 | { Opt_acdirmin, "acdirmin=%s" }, | |
158 | { Opt_acdirmax, "acdirmax=%s" }, | |
159 | { Opt_actimeo, "actimeo=%s" }, | |
160 | { Opt_namelen, "namlen=%s" }, | |
161 | { Opt_mountport, "mountport=%s" }, | |
162 | { Opt_mountvers, "mountvers=%s" }, | |
0d71b058 TM |
163 | { Opt_minorversion, "minorversion=%s" }, |
164 | ||
a5a16bae CL |
165 | { Opt_nfsvers, "nfsvers=%s" }, |
166 | { Opt_nfsvers, "vers=%s" }, | |
bf0fd768 CL |
167 | |
168 | { Opt_sec, "sec=%s" }, | |
169 | { Opt_proto, "proto=%s" }, | |
170 | { Opt_mountproto, "mountproto=%s" }, | |
171 | { Opt_addr, "addr=%s" }, | |
172 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 173 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 174 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 | 175 | |
7973c1f1 | 176 | { Opt_lookupcache, "lookupcache=%s" }, |
a6d5ff64 | 177 | { Opt_fscache_uniq, "fsc=%s" }, |
5eebde23 | 178 | { Opt_local_lock, "local_lock=%s" }, |
7973c1f1 | 179 | |
3862279a TM |
180 | /* The following needs to be listed after all other options */ |
181 | { Opt_nfsvers, "v%s" }, | |
182 | ||
bf0fd768 CL |
183 | { Opt_err, NULL } |
184 | }; | |
185 | ||
186 | enum { | |
ee671b01 | 187 | Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, |
bf0fd768 CL |
188 | |
189 | Opt_xprt_err | |
190 | }; | |
191 | ||
a447c093 | 192 | static const match_table_t nfs_xprt_protocol_tokens = { |
bf0fd768 | 193 | { Opt_xprt_udp, "udp" }, |
ee671b01 | 194 | { Opt_xprt_udp6, "udp6" }, |
bf0fd768 | 195 | { Opt_xprt_tcp, "tcp" }, |
ee671b01 | 196 | { Opt_xprt_tcp6, "tcp6" }, |
2cf7ff7a | 197 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
198 | |
199 | { Opt_xprt_err, NULL } | |
200 | }; | |
201 | ||
202 | enum { | |
203 | Opt_sec_none, Opt_sec_sys, | |
204 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
205 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
206 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
207 | ||
208 | Opt_sec_err | |
209 | }; | |
210 | ||
a447c093 | 211 | static const match_table_t nfs_secflavor_tokens = { |
bf0fd768 CL |
212 | { Opt_sec_none, "none" }, |
213 | { Opt_sec_none, "null" }, | |
214 | { Opt_sec_sys, "sys" }, | |
215 | ||
216 | { Opt_sec_krb5, "krb5" }, | |
217 | { Opt_sec_krb5i, "krb5i" }, | |
218 | { Opt_sec_krb5p, "krb5p" }, | |
219 | ||
220 | { Opt_sec_lkey, "lkey" }, | |
221 | { Opt_sec_lkeyi, "lkeyi" }, | |
222 | { Opt_sec_lkeyp, "lkeyp" }, | |
223 | ||
8d042218 OK |
224 | { Opt_sec_spkm, "spkm3" }, |
225 | { Opt_sec_spkmi, "spkm3i" }, | |
226 | { Opt_sec_spkmp, "spkm3p" }, | |
227 | ||
bf0fd768 CL |
228 | { Opt_sec_err, NULL } |
229 | }; | |
230 | ||
7973c1f1 TM |
231 | enum { |
232 | Opt_lookupcache_all, Opt_lookupcache_positive, | |
233 | Opt_lookupcache_none, | |
234 | ||
235 | Opt_lookupcache_err | |
236 | }; | |
237 | ||
238 | static match_table_t nfs_lookupcache_tokens = { | |
239 | { Opt_lookupcache_all, "all" }, | |
240 | { Opt_lookupcache_positive, "pos" }, | |
241 | { Opt_lookupcache_positive, "positive" }, | |
242 | { Opt_lookupcache_none, "none" }, | |
243 | ||
244 | { Opt_lookupcache_err, NULL } | |
245 | }; | |
246 | ||
5eebde23 SJ |
247 | enum { |
248 | Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, | |
249 | Opt_local_lock_none, | |
250 | ||
251 | Opt_local_lock_err | |
252 | }; | |
253 | ||
254 | static match_table_t nfs_local_lock_tokens = { | |
255 | { Opt_local_lock_all, "all" }, | |
256 | { Opt_local_lock_flock, "flock" }, | |
257 | { Opt_local_lock_posix, "posix" }, | |
258 | { Opt_local_lock_none, "none" }, | |
259 | ||
260 | { Opt_local_lock_err, NULL } | |
261 | }; | |
262 | ||
0d71b058 TM |
263 | enum { |
264 | Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, | |
265 | Opt_vers_4_1, | |
266 | ||
267 | Opt_vers_err | |
268 | }; | |
269 | ||
270 | static match_table_t nfs_vers_tokens = { | |
271 | { Opt_vers_2, "2" }, | |
272 | { Opt_vers_3, "3" }, | |
273 | { Opt_vers_4, "4" }, | |
274 | { Opt_vers_4_0, "4.0" }, | |
275 | { Opt_vers_4_1, "4.1" }, | |
276 | ||
277 | { Opt_vers_err, NULL } | |
278 | }; | |
bf0fd768 | 279 | |
42faad99 | 280 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 281 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
34c80b1d | 282 | static int nfs_show_options(struct seq_file *, struct dentry *); |
d861c630 | 283 | static int nfs_show_devname(struct seq_file *, struct dentry *); |
a6322de6 | 284 | static int nfs_show_path(struct seq_file *, struct dentry *); |
64132379 | 285 | static int nfs_show_stats(struct seq_file *, struct dentry *); |
01194981 AV |
286 | static struct dentry *nfs_fs_mount(struct file_system_type *, |
287 | int, const char *, void *); | |
31f43471 AV |
288 | static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, |
289 | int flags, const char *dev_name, void *raw_data); | |
387c149b | 290 | static void nfs_put_super(struct super_block *); |
f7b422b1 | 291 | static void nfs_kill_super(struct super_block *); |
48b605f8 | 292 | static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); |
f7b422b1 DH |
293 | |
294 | static struct file_system_type nfs_fs_type = { | |
295 | .owner = THIS_MODULE, | |
296 | .name = "nfs", | |
01194981 | 297 | .mount = nfs_fs_mount, |
f7b422b1 | 298 | .kill_sb = nfs_kill_super, |
349457cc | 299 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
300 | }; |
301 | ||
54ceac45 | 302 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
303 | .owner = THIS_MODULE, |
304 | .name = "nfs", | |
31f43471 | 305 | .mount = nfs_xdev_mount, |
f7b422b1 | 306 | .kill_sb = nfs_kill_super, |
349457cc | 307 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
308 | }; |
309 | ||
ee9b6d61 | 310 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
311 | .alloc_inode = nfs_alloc_inode, |
312 | .destroy_inode = nfs_destroy_inode, | |
313 | .write_inode = nfs_write_inode, | |
387c149b | 314 | .put_super = nfs_put_super, |
f7b422b1 | 315 | .statfs = nfs_statfs, |
b57922d9 | 316 | .evict_inode = nfs_evict_inode, |
f7b422b1 DH |
317 | .umount_begin = nfs_umount_begin, |
318 | .show_options = nfs_show_options, | |
c7f404b4 AV |
319 | .show_devname = nfs_show_devname, |
320 | .show_path = nfs_show_path, | |
f7b422b1 | 321 | .show_stats = nfs_show_stats, |
48b605f8 | 322 | .remount_fs = nfs_remount, |
f7b422b1 DH |
323 | }; |
324 | ||
325 | #ifdef CONFIG_NFS_V4 | |
7630c852 CL |
326 | static int nfs4_validate_text_mount_data(void *options, |
327 | struct nfs_parsed_mount_data *args, const char *dev_name); | |
01194981 AV |
328 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
329 | struct nfs_parsed_mount_data *data); | |
330 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, | |
331 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
332 | static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
333 | int flags, const char *dev_name, void *raw_data); | |
334 | static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, | |
335 | int flags, const char *dev_name, void *raw_data); | |
01194981 AV |
336 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
337 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
338 | static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
339 | int flags, const char *dev_name, void *raw_data); | |
f7b422b1 DH |
340 | static void nfs4_kill_super(struct super_block *sb); |
341 | ||
342 | static struct file_system_type nfs4_fs_type = { | |
343 | .owner = THIS_MODULE, | |
344 | .name = "nfs4", | |
01194981 | 345 | .mount = nfs4_mount, |
f7b422b1 | 346 | .kill_sb = nfs4_kill_super, |
349457cc | 347 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
348 | }; |
349 | ||
c02d7adf TM |
350 | static struct file_system_type nfs4_remote_fs_type = { |
351 | .owner = THIS_MODULE, | |
352 | .name = "nfs4", | |
31f43471 | 353 | .mount = nfs4_remote_mount, |
c02d7adf TM |
354 | .kill_sb = nfs4_kill_super, |
355 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
356 | }; | |
357 | ||
54ceac45 | 358 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
359 | .owner = THIS_MODULE, |
360 | .name = "nfs4", | |
31f43471 | 361 | .mount = nfs4_xdev_mount, |
f7b422b1 | 362 | .kill_sb = nfs4_kill_super, |
349457cc | 363 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
364 | }; |
365 | ||
c02d7adf TM |
366 | static struct file_system_type nfs4_remote_referral_fs_type = { |
367 | .owner = THIS_MODULE, | |
368 | .name = "nfs4", | |
31f43471 | 369 | .mount = nfs4_remote_referral_mount, |
c02d7adf TM |
370 | .kill_sb = nfs4_kill_super, |
371 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
372 | }; | |
373 | ||
54ceac45 | 374 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
375 | .owner = THIS_MODULE, |
376 | .name = "nfs4", | |
01194981 | 377 | .mount = nfs4_referral_mount, |
f7b422b1 | 378 | .kill_sb = nfs4_kill_super, |
349457cc | 379 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
380 | }; |
381 | ||
ee9b6d61 | 382 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
383 | .alloc_inode = nfs_alloc_inode, |
384 | .destroy_inode = nfs_destroy_inode, | |
385 | .write_inode = nfs_write_inode, | |
387c149b | 386 | .put_super = nfs_put_super, |
f7b422b1 | 387 | .statfs = nfs_statfs, |
b57922d9 | 388 | .evict_inode = nfs4_evict_inode, |
f7b422b1 DH |
389 | .umount_begin = nfs_umount_begin, |
390 | .show_options = nfs_show_options, | |
c7f404b4 AV |
391 | .show_devname = nfs_show_devname, |
392 | .show_path = nfs_show_path, | |
f7b422b1 | 393 | .show_stats = nfs_show_stats, |
48b605f8 | 394 | .remount_fs = nfs_remount, |
f7b422b1 DH |
395 | }; |
396 | #endif | |
397 | ||
8e1f936b RR |
398 | static struct shrinker acl_shrinker = { |
399 | .shrink = nfs_access_cache_shrinker, | |
400 | .seeks = DEFAULT_SEEKS, | |
401 | }; | |
979df72e | 402 | |
f7b422b1 DH |
403 | /* |
404 | * Register the NFS filesystems | |
405 | */ | |
406 | int __init register_nfs_fs(void) | |
407 | { | |
408 | int ret; | |
409 | ||
410 | ret = register_filesystem(&nfs_fs_type); | |
411 | if (ret < 0) | |
412 | goto error_0; | |
413 | ||
f7b422b1 DH |
414 | ret = nfs_register_sysctl(); |
415 | if (ret < 0) | |
416 | goto error_1; | |
89a09141 | 417 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
418 | ret = register_filesystem(&nfs4_fs_type); |
419 | if (ret < 0) | |
420 | goto error_2; | |
421 | #endif | |
8e1f936b | 422 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
423 | return 0; |
424 | ||
425 | #ifdef CONFIG_NFS_V4 | |
426 | error_2: | |
427 | nfs_unregister_sysctl(); | |
89a09141 | 428 | #endif |
f7b422b1 DH |
429 | error_1: |
430 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
431 | error_0: |
432 | return ret; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Unregister the NFS filesystems | |
437 | */ | |
438 | void __exit unregister_nfs_fs(void) | |
439 | { | |
8e1f936b | 440 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
441 | #ifdef CONFIG_NFS_V4 |
442 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 443 | #endif |
49af7ee1 | 444 | nfs_unregister_sysctl(); |
f7b422b1 DH |
445 | unregister_filesystem(&nfs_fs_type); |
446 | } | |
447 | ||
1daef0a8 | 448 | void nfs_sb_active(struct super_block *sb) |
ef818a28 | 449 | { |
1daef0a8 | 450 | struct nfs_server *server = NFS_SB(sb); |
ef818a28 | 451 | |
1daef0a8 TM |
452 | if (atomic_inc_return(&server->active) == 1) |
453 | atomic_inc(&sb->s_active); | |
ef818a28 SD |
454 | } |
455 | ||
1daef0a8 | 456 | void nfs_sb_deactive(struct super_block *sb) |
ef818a28 SD |
457 | { |
458 | struct nfs_server *server = NFS_SB(sb); | |
1daef0a8 TM |
459 | |
460 | if (atomic_dec_and_test(&server->active)) | |
461 | deactivate_super(sb); | |
ef818a28 SD |
462 | } |
463 | ||
f7b422b1 DH |
464 | /* |
465 | * Deliver file system statistics to userspace | |
466 | */ | |
816724e6 | 467 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 468 | { |
0c7d90cf | 469 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
470 | unsigned char blockbits; |
471 | unsigned long blockres; | |
0c7d90cf | 472 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
ca7e9a0d TM |
473 | struct nfs_fsstat res; |
474 | int error = -ENOMEM; | |
475 | ||
476 | res.fattr = nfs_alloc_fattr(); | |
477 | if (res.fattr == NULL) | |
478 | goto out_err; | |
f7b422b1 | 479 | |
8fa5c000 | 480 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
fbf3fdd2 MZ |
481 | if (unlikely(error == -ESTALE)) { |
482 | struct dentry *pd_dentry; | |
483 | ||
484 | pd_dentry = dget_parent(dentry); | |
485 | if (pd_dentry != NULL) { | |
486 | nfs_zap_caches(pd_dentry->d_inode); | |
487 | dput(pd_dentry); | |
488 | } | |
489 | } | |
ca7e9a0d | 490 | nfs_free_fattr(res.fattr); |
f7b422b1 DH |
491 | if (error < 0) |
492 | goto out_err; | |
ca7e9a0d | 493 | |
1a0ba9ae | 494 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
495 | |
496 | /* | |
497 | * Current versions of glibc do not correctly handle the | |
498 | * case where f_frsize != f_bsize. Eventually we want to | |
499 | * report the value of wtmult in this field. | |
500 | */ | |
0c7d90cf | 501 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
502 | |
503 | /* | |
504 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
505 | * are reported in units of f_frsize. Linux hasn't had | |
506 | * an f_frsize field in its statfs struct until recently, | |
507 | * thus historically Linux's sys_statfs reports these | |
508 | * fields in units of f_bsize. | |
509 | */ | |
0c7d90cf DH |
510 | buf->f_bsize = dentry->d_sb->s_blocksize; |
511 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
512 | blockres = (1 << blockbits) - 1; |
513 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
514 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
515 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
516 | ||
517 | buf->f_files = res.tfiles; | |
518 | buf->f_ffree = res.afiles; | |
519 | ||
520 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 521 | |
f7b422b1 DH |
522 | return 0; |
523 | ||
524 | out_err: | |
3110ff80 | 525 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 526 | return error; |
f7b422b1 DH |
527 | } |
528 | ||
7d4e2747 DH |
529 | /* |
530 | * Map the security flavour number to a name | |
531 | */ | |
81039f1f TM |
532 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
533 | { | |
7d4e2747 | 534 | static const struct { |
81039f1f TM |
535 | rpc_authflavor_t flavour; |
536 | const char *str; | |
537 | } sec_flavours[] = { | |
538 | { RPC_AUTH_NULL, "null" }, | |
539 | { RPC_AUTH_UNIX, "sys" }, | |
540 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
541 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
542 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
543 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
544 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
545 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
546 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
547 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
548 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 549 | { UINT_MAX, "unknown" } |
81039f1f TM |
550 | }; |
551 | int i; | |
552 | ||
4d81cd16 | 553 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
554 | if (sec_flavours[i].flavour == flavour) |
555 | break; | |
556 | } | |
557 | return sec_flavours[i].str; | |
558 | } | |
559 | ||
ee671b01 JL |
560 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
561 | int showdefaults) | |
562 | { | |
563 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; | |
564 | ||
565 | seq_printf(m, ",mountproto="); | |
566 | switch (sap->sa_family) { | |
567 | case AF_INET: | |
568 | switch (nfss->mountd_protocol) { | |
569 | case IPPROTO_UDP: | |
570 | seq_printf(m, RPCBIND_NETID_UDP); | |
571 | break; | |
572 | case IPPROTO_TCP: | |
573 | seq_printf(m, RPCBIND_NETID_TCP); | |
574 | break; | |
575 | default: | |
576 | if (showdefaults) | |
577 | seq_printf(m, "auto"); | |
578 | } | |
579 | break; | |
580 | case AF_INET6: | |
581 | switch (nfss->mountd_protocol) { | |
582 | case IPPROTO_UDP: | |
583 | seq_printf(m, RPCBIND_NETID_UDP6); | |
584 | break; | |
585 | case IPPROTO_TCP: | |
586 | seq_printf(m, RPCBIND_NETID_TCP6); | |
587 | break; | |
588 | default: | |
589 | if (showdefaults) | |
590 | seq_printf(m, "auto"); | |
591 | } | |
592 | break; | |
593 | default: | |
594 | if (showdefaults) | |
595 | seq_printf(m, "auto"); | |
596 | } | |
597 | } | |
598 | ||
82d101d5 CL |
599 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
600 | int showdefaults) | |
601 | { | |
602 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
603 | ||
d5eff1a3 BS |
604 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
605 | return; | |
606 | ||
82d101d5 CL |
607 | switch (sap->sa_family) { |
608 | case AF_INET: { | |
609 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
be859405 | 610 | seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
82d101d5 CL |
611 | break; |
612 | } | |
613 | case AF_INET6: { | |
614 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
d250e190 | 615 | seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
82d101d5 CL |
616 | break; |
617 | } | |
618 | default: | |
619 | if (showdefaults) | |
620 | seq_printf(m, ",mountaddr=unspecified"); | |
621 | } | |
622 | ||
623 | if (nfss->mountd_version || showdefaults) | |
624 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
aa699473 SK |
625 | if ((nfss->mountd_port && |
626 | nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || | |
627 | showdefaults) | |
82d101d5 CL |
628 | seq_printf(m, ",mountport=%u", nfss->mountd_port); |
629 | ||
ee671b01 | 630 | nfs_show_mountd_netid(m, nfss, showdefaults); |
82d101d5 CL |
631 | } |
632 | ||
0be8189f TM |
633 | #ifdef CONFIG_NFS_V4 |
634 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
635 | int showdefaults) | |
636 | { | |
637 | struct nfs_client *clp = nfss->nfs_client; | |
638 | ||
639 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
0be8189f TM |
640 | } |
641 | #else | |
642 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
643 | int showdefaults) | |
644 | { | |
645 | } | |
646 | #endif | |
647 | ||
7bbceb6f TM |
648 | static void nfs_show_nfs_version(struct seq_file *m, |
649 | unsigned int version, | |
650 | unsigned int minorversion) | |
651 | { | |
652 | seq_printf(m, ",vers=%u", version); | |
653 | if (version == 4) | |
654 | seq_printf(m, ".%u", minorversion); | |
655 | } | |
656 | ||
f7b422b1 DH |
657 | /* |
658 | * Describe the mount options in force on this server representation | |
659 | */ | |
82d101d5 CL |
660 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
661 | int showdefaults) | |
f7b422b1 | 662 | { |
509de811 | 663 | static const struct proc_nfs_info { |
f7b422b1 | 664 | int flag; |
509de811 DH |
665 | const char *str; |
666 | const char *nostr; | |
f7b422b1 DH |
667 | } nfs_info[] = { |
668 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 | 669 | { NFS_MOUNT_POSIX, ",posix", "" }, |
f7b422b1 DH |
670 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
671 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
672 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
673 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 674 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
d740351b CL |
675 | { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
676 | { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, | |
f7b422b1 DH |
677 | { 0, NULL, NULL } |
678 | }; | |
509de811 | 679 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 680 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 681 | u32 version = clp->rpc_ops->version; |
7c563cc9 | 682 | int local_flock, local_fcntl; |
f7b422b1 | 683 | |
7bbceb6f | 684 | nfs_show_nfs_version(m, version, clp->cl_minorversion); |
2d767432 CL |
685 | seq_printf(m, ",rsize=%u", nfss->rsize); |
686 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
687 | if (nfss->bsize != 0) |
688 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
689 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 690 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 691 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 692 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 693 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 694 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 695 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 696 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 697 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
698 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
699 | if (nfss->flags & nfs_infop->flag) | |
700 | seq_puts(m, nfs_infop->str); | |
701 | else | |
702 | seq_puts(m, nfs_infop->nostr); | |
703 | } | |
2446ab60 | 704 | rcu_read_lock(); |
56928edd | 705 | seq_printf(m, ",proto=%s", |
ee671b01 | 706 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
2446ab60 | 707 | rcu_read_unlock(); |
82d101d5 CL |
708 | if (version == 4) { |
709 | if (nfss->port != NFS_PORT) | |
710 | seq_printf(m, ",port=%u", nfss->port); | |
711 | } else | |
712 | if (nfss->port) | |
713 | seq_printf(m, ",port=%u", nfss->port); | |
714 | ||
33170233 TM |
715 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
716 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 717 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
718 | |
719 | if (version != 4) | |
720 | nfs_show_mountd_options(m, nfss, showdefaults); | |
0be8189f TM |
721 | else |
722 | nfs_show_nfsv4_options(m, nfss, showdefaults); | |
82d101d5 | 723 | |
b797cac7 DH |
724 | if (nfss->options & NFS_OPTION_FSCACHE) |
725 | seq_printf(m, ",fsc"); | |
9b00c643 PL |
726 | |
727 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { | |
728 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) | |
729 | seq_printf(m, ",lookupcache=none"); | |
730 | else | |
731 | seq_printf(m, ",lookupcache=pos"); | |
732 | } | |
7c563cc9 SJ |
733 | |
734 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; | |
735 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; | |
736 | ||
737 | if (!local_flock && !local_fcntl) | |
738 | seq_printf(m, ",local_lock=none"); | |
739 | else if (local_flock && local_fcntl) | |
740 | seq_printf(m, ",local_lock=all"); | |
741 | else if (local_flock) | |
742 | seq_printf(m, ",local_lock=flock"); | |
743 | else | |
744 | seq_printf(m, ",local_lock=posix"); | |
f7b422b1 DH |
745 | } |
746 | ||
747 | /* | |
748 | * Describe the mount options on this VFS mountpoint | |
749 | */ | |
34c80b1d | 750 | static int nfs_show_options(struct seq_file *m, struct dentry *root) |
f7b422b1 | 751 | { |
34c80b1d | 752 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
753 | |
754 | nfs_show_mount_options(m, nfss, 0); | |
755 | ||
2446ab60 | 756 | rcu_read_lock(); |
5d8515ca CL |
757 | seq_printf(m, ",addr=%s", |
758 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
759 | RPC_DISPLAY_ADDR)); | |
2446ab60 | 760 | rcu_read_unlock(); |
f7b422b1 DH |
761 | |
762 | return 0; | |
763 | } | |
45402c38 HS |
764 | |
765 | #ifdef CONFIG_NFS_V4 | |
ae50c0b5 | 766 | #ifdef CONFIG_NFS_V4_1 |
45402c38 | 767 | static void show_sessions(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
768 | { |
769 | if (nfs4_has_session(server->nfs_client)) | |
770 | seq_printf(m, ",sessions"); | |
771 | } | |
772 | #else | |
45402c38 HS |
773 | static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
774 | #endif | |
ae50c0b5 BF |
775 | #endif |
776 | ||
777 | #ifdef CONFIG_NFS_V4_1 | |
45402c38 | 778 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
779 | { |
780 | seq_printf(m, ",pnfs="); | |
781 | if (server->pnfs_curr_ld) | |
782 | seq_printf(m, "%s", server->pnfs_curr_ld->name); | |
783 | else | |
784 | seq_printf(m, "not configured"); | |
785 | } | |
7e03b7cc TM |
786 | |
787 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) | |
788 | { | |
789 | if (nfss->nfs_client && nfss->nfs_client->impl_id) { | |
790 | struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id; | |
791 | seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," | |
792 | "date='%llu,%u'", | |
793 | impl_id->name, impl_id->domain, | |
794 | impl_id->date.seconds, impl_id->date.nseconds); | |
795 | } | |
796 | } | |
45402c38 | 797 | #else |
7e03b7cc TM |
798 | #ifdef CONFIG_NFS_V4 |
799 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) | |
800 | { | |
801 | } | |
45402c38 | 802 | #endif |
7e03b7cc TM |
803 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
804 | { | |
805 | } | |
45402c38 | 806 | #endif |
f7b422b1 | 807 | |
d861c630 | 808 | static int nfs_show_devname(struct seq_file *m, struct dentry *root) |
c7f404b4 AV |
809 | { |
810 | char *page = (char *) __get_free_page(GFP_KERNEL); | |
811 | char *devname, *dummy; | |
812 | int err = 0; | |
813 | if (!page) | |
814 | return -ENOMEM; | |
d861c630 | 815 | devname = nfs_path(&dummy, root, page, PAGE_SIZE); |
c7f404b4 AV |
816 | if (IS_ERR(devname)) |
817 | err = PTR_ERR(devname); | |
818 | else | |
819 | seq_escape(m, devname, " \t\n\\"); | |
820 | free_page((unsigned long)page); | |
821 | return err; | |
822 | } | |
823 | ||
a6322de6 | 824 | static int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
c7f404b4 AV |
825 | { |
826 | seq_puts(m, "/"); | |
827 | return 0; | |
828 | } | |
829 | ||
f7b422b1 DH |
830 | /* |
831 | * Present statistical information for this VFS mountpoint | |
832 | */ | |
64132379 | 833 | static int nfs_show_stats(struct seq_file *m, struct dentry *root) |
f7b422b1 DH |
834 | { |
835 | int i, cpu; | |
64132379 | 836 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
837 | struct rpc_auth *auth = nfss->client->cl_auth; |
838 | struct nfs_iostats totals = { }; | |
839 | ||
840 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
841 | ||
842 | /* | |
843 | * Display all mount option settings | |
844 | */ | |
845 | seq_printf(m, "\n\topts:\t"); | |
64132379 AV |
846 | seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); |
847 | seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
848 | seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
849 | seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
f7b422b1 DH |
850 | nfs_show_mount_options(m, nfss, 1); |
851 | ||
852 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
853 | ||
7e03b7cc | 854 | show_implementation_id(m, nfss); |
7d2ed9ac | 855 | |
f7b422b1 DH |
856 | seq_printf(m, "\n\tcaps:\t"); |
857 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
858 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
859 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
860 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
861 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
862 | |
863 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 864 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
865 | seq_printf(m, "\n\tnfsv4:\t"); |
866 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
867 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
868 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
ae50c0b5 BF |
869 | show_sessions(m, nfss); |
870 | show_pnfs(m, nfss); | |
f7b422b1 DH |
871 | } |
872 | #endif | |
873 | ||
874 | /* | |
875 | * Display security flavor in effect for this mount | |
876 | */ | |
2d767432 | 877 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 878 | if (auth->au_flavor) |
2d767432 | 879 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
880 | |
881 | /* | |
882 | * Display superblock I/O counters | |
883 | */ | |
884 | for_each_possible_cpu(cpu) { | |
885 | struct nfs_iostats *stats; | |
886 | ||
887 | preempt_disable(); | |
888 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
889 | ||
890 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
891 | totals.events[i] += stats->events[i]; | |
892 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
893 | totals.bytes[i] += stats->bytes[i]; | |
6a51091d DH |
894 | #ifdef CONFIG_NFS_FSCACHE |
895 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
896 | totals.fscache[i] += stats->fscache[i]; | |
897 | #endif | |
f7b422b1 DH |
898 | |
899 | preempt_enable(); | |
900 | } | |
901 | ||
902 | seq_printf(m, "\n\tevents:\t"); | |
903 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
904 | seq_printf(m, "%lu ", totals.events[i]); | |
905 | seq_printf(m, "\n\tbytes:\t"); | |
906 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
907 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
6a51091d DH |
908 | #ifdef CONFIG_NFS_FSCACHE |
909 | if (nfss->options & NFS_OPTION_FSCACHE) { | |
910 | seq_printf(m, "\n\tfsc:\t"); | |
911 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
912 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
913 | } | |
914 | #endif | |
f7b422b1 DH |
915 | seq_printf(m, "\n"); |
916 | ||
917 | rpc_print_iostats(m, nfss->client); | |
918 | ||
919 | return 0; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 924 | * in response to xdev traversals and referrals |
f7b422b1 | 925 | */ |
42faad99 | 926 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 927 | { |
67e55205 | 928 | struct nfs_server *server; |
fc6ae3cf TM |
929 | struct rpc_clnt *rpc; |
930 | ||
67e55205 | 931 | server = NFS_SB(sb); |
fc6ae3cf TM |
932 | /* -EIO all pending I/O */ |
933 | rpc = server->client_acl; | |
934 | if (!IS_ERR(rpc)) | |
935 | rpc_killall_tasks(rpc); | |
936 | rpc = server->client; | |
937 | if (!IS_ERR(rpc)) | |
938 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
939 | } |
940 | ||
c5811dbd | 941 | static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) |
9423a08a CL |
942 | { |
943 | struct nfs_parsed_mount_data *data; | |
944 | ||
945 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
946 | if (data) { | |
9423a08a CL |
947 | data->acregmin = NFS_DEF_ACREGMIN; |
948 | data->acregmax = NFS_DEF_ACREGMAX; | |
949 | data->acdirmin = NFS_DEF_ACDIRMIN; | |
950 | data->acdirmax = NFS_DEF_ACDIRMAX; | |
c5811dbd | 951 | data->mount_server.port = NFS_UNSPEC_PORT; |
9423a08a | 952 | data->nfs_server.port = NFS_UNSPEC_PORT; |
c5811dbd | 953 | data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
9423a08a CL |
954 | data->auth_flavors[0] = RPC_AUTH_UNIX; |
955 | data->auth_flavor_len = 1; | |
c5811dbd | 956 | data->version = version; |
9423a08a | 957 | data->minorversion = 0; |
9937347a | 958 | data->net = current->nsproxy->net_ns; |
8a0d551a | 959 | security_init_mnt_opts(&data->lsm_opts); |
9423a08a CL |
960 | } |
961 | return data; | |
962 | } | |
963 | ||
8a0d551a JL |
964 | static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) |
965 | { | |
966 | if (data) { | |
967 | kfree(data->client_address); | |
968 | kfree(data->mount_server.hostname); | |
969 | kfree(data->nfs_server.export_path); | |
970 | kfree(data->nfs_server.hostname); | |
971 | kfree(data->fscache_uniq); | |
972 | security_free_mnt_opts(&data->lsm_opts); | |
973 | kfree(data); | |
974 | } | |
975 | } | |
976 | ||
fc50d58f | 977 | /* |
cdcd7f9a CL |
978 | * Sanity-check a server address provided by the mount command. |
979 | * | |
980 | * Address family must be initialized, and address must not be | |
981 | * the ANY address for that family. | |
fc50d58f CL |
982 | */ |
983 | static int nfs_verify_server_address(struct sockaddr *addr) | |
984 | { | |
985 | switch (addr->sa_family) { | |
986 | case AF_INET: { | |
cdcd7f9a | 987 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 988 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
989 | } |
990 | case AF_INET6: { | |
991 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
992 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
993 | } |
994 | } | |
995 | ||
53a0b9c4 | 996 | dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
fc50d58f CL |
997 | return 0; |
998 | } | |
999 | ||
4cfd74fc CL |
1000 | /* |
1001 | * Select between a default port value and a user-specified port value. | |
1002 | * If a zero value is set, then autobind will be used. | |
1003 | */ | |
f5855fec | 1004 | static void nfs_set_port(struct sockaddr *sap, int *port, |
4cfd74fc CL |
1005 | const unsigned short default_port) |
1006 | { | |
f5855fec TM |
1007 | if (*port == NFS_UNSPEC_PORT) |
1008 | *port = default_port; | |
4cfd74fc | 1009 | |
f5855fec | 1010 | rpc_set_port(sap, *port); |
4cfd74fc CL |
1011 | } |
1012 | ||
259875ef TM |
1013 | /* |
1014 | * Sanity check the NFS transport protocol. | |
1015 | * | |
1016 | */ | |
1017 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1018 | { | |
1019 | switch (mnt->nfs_server.protocol) { | |
1020 | case XPRT_TRANSPORT_UDP: | |
1021 | case XPRT_TRANSPORT_TCP: | |
1022 | case XPRT_TRANSPORT_RDMA: | |
1023 | break; | |
1024 | default: | |
1025 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
1031 | * settings should depend upon the specified NFS transport. | |
1032 | */ | |
1033 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1034 | { | |
1035 | nfs_validate_transport_protocol(mnt); | |
1036 | ||
1037 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
1038 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
1039 | return; | |
1040 | switch (mnt->nfs_server.protocol) { | |
1041 | case XPRT_TRANSPORT_UDP: | |
1042 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
1043 | break; | |
1044 | case XPRT_TRANSPORT_TCP: | |
1045 | case XPRT_TRANSPORT_RDMA: | |
1046 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
1047 | } | |
1048 | } | |
1049 | ||
01060c89 CL |
1050 | /* |
1051 | * Parse the value of the 'sec=' option. | |
01060c89 CL |
1052 | */ |
1053 | static int nfs_parse_security_flavors(char *value, | |
1054 | struct nfs_parsed_mount_data *mnt) | |
1055 | { | |
1056 | substring_t args[MAX_OPT_ARGS]; | |
1057 | ||
1058 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
1059 | ||
1060 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
1061 | case Opt_sec_none: | |
01060c89 CL |
1062 | mnt->auth_flavors[0] = RPC_AUTH_NULL; |
1063 | break; | |
1064 | case Opt_sec_sys: | |
01060c89 CL |
1065 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
1066 | break; | |
1067 | case Opt_sec_krb5: | |
01060c89 CL |
1068 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
1069 | break; | |
1070 | case Opt_sec_krb5i: | |
01060c89 CL |
1071 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
1072 | break; | |
1073 | case Opt_sec_krb5p: | |
01060c89 CL |
1074 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
1075 | break; | |
1076 | case Opt_sec_lkey: | |
01060c89 CL |
1077 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
1078 | break; | |
1079 | case Opt_sec_lkeyi: | |
01060c89 CL |
1080 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
1081 | break; | |
1082 | case Opt_sec_lkeyp: | |
01060c89 CL |
1083 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
1084 | break; | |
1085 | case Opt_sec_spkm: | |
01060c89 CL |
1086 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
1087 | break; | |
1088 | case Opt_sec_spkmi: | |
01060c89 CL |
1089 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
1090 | break; | |
1091 | case Opt_sec_spkmp: | |
01060c89 CL |
1092 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
1093 | break; | |
1094 | default: | |
1095 | return 0; | |
1096 | } | |
1097 | ||
9b7160c5 | 1098 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
059f90b3 | 1099 | mnt->auth_flavor_len = 1; |
01060c89 CL |
1100 | return 1; |
1101 | } | |
1102 | ||
0d71b058 TM |
1103 | static int nfs_parse_version_string(char *string, |
1104 | struct nfs_parsed_mount_data *mnt, | |
1105 | substring_t *args) | |
1106 | { | |
1107 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1108 | switch (match_token(string, nfs_vers_tokens, args)) { | |
1109 | case Opt_vers_2: | |
1110 | mnt->version = 2; | |
1111 | break; | |
1112 | case Opt_vers_3: | |
1113 | mnt->flags |= NFS_MOUNT_VER3; | |
1114 | mnt->version = 3; | |
1115 | break; | |
1116 | case Opt_vers_4: | |
1117 | /* Backward compatibility option. In future, | |
1118 | * the mount program should always supply | |
1119 | * a NFSv4 minor version number. | |
1120 | */ | |
1121 | mnt->version = 4; | |
1122 | break; | |
1123 | case Opt_vers_4_0: | |
1124 | mnt->version = 4; | |
1125 | mnt->minorversion = 0; | |
1126 | break; | |
1127 | case Opt_vers_4_1: | |
1128 | mnt->version = 4; | |
1129 | mnt->minorversion = 1; | |
1130 | break; | |
1131 | default: | |
1132 | return 0; | |
1133 | } | |
1134 | return 1; | |
1135 | } | |
1136 | ||
c5cb09b6 RL |
1137 | static int nfs_get_option_str(substring_t args[], char **option) |
1138 | { | |
1139 | kfree(*option); | |
1140 | *option = match_strdup(args); | |
1141 | return !option; | |
1142 | } | |
1143 | ||
1144 | static int nfs_get_option_ul(substring_t args[], unsigned long *option) | |
1145 | { | |
1146 | int rc; | |
1147 | char *string; | |
1148 | ||
1149 | string = match_strdup(args); | |
1150 | if (string == NULL) | |
1151 | return -ENOMEM; | |
1152 | rc = strict_strtoul(string, 10, option); | |
1153 | kfree(string); | |
1154 | ||
1155 | return rc; | |
1156 | } | |
1157 | ||
bf0fd768 CL |
1158 | /* |
1159 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
1160 | * a data structure. The whole mount string is processed; bad options are |
1161 | * skipped as they are encountered. If there were no errors, return 1; | |
1162 | * otherwise return 0 (zero). | |
bf0fd768 CL |
1163 | */ |
1164 | static int nfs_parse_mount_options(char *raw, | |
1165 | struct nfs_parsed_mount_data *mnt) | |
1166 | { | |
f9c3a380 | 1167 | char *p, *string, *secdata; |
d23c45fd | 1168 | int rc, sloppy = 0, invalid_option = 0; |
ee671b01 JL |
1169 | unsigned short protofamily = AF_UNSPEC; |
1170 | unsigned short mountfamily = AF_UNSPEC; | |
bf0fd768 CL |
1171 | |
1172 | if (!raw) { | |
1173 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
1174 | return 1; | |
1175 | } | |
1176 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
1177 | ||
f9c3a380 EP |
1178 | secdata = alloc_secdata(); |
1179 | if (!secdata) | |
1180 | goto out_nomem; | |
1181 | ||
1182 | rc = security_sb_copy_data(raw, secdata); | |
1183 | if (rc) | |
1184 | goto out_security_failure; | |
1185 | ||
1186 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
1187 | if (rc) | |
1188 | goto out_security_failure; | |
1189 | ||
1190 | free_secdata(secdata); | |
1191 | ||
bf0fd768 CL |
1192 | while ((p = strsep(&raw, ",")) != NULL) { |
1193 | substring_t args[MAX_OPT_ARGS]; | |
a5a16bae CL |
1194 | unsigned long option; |
1195 | int token; | |
bf0fd768 CL |
1196 | |
1197 | if (!*p) | |
1198 | continue; | |
1199 | ||
1200 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
1201 | ||
1202 | token = match_token(p, nfs_mount_option_tokens, args); | |
1203 | switch (token) { | |
f45663ce CL |
1204 | |
1205 | /* | |
1206 | * boolean options: foo/nofoo | |
1207 | */ | |
bf0fd768 CL |
1208 | case Opt_soft: |
1209 | mnt->flags |= NFS_MOUNT_SOFT; | |
1210 | break; | |
1211 | case Opt_hard: | |
1212 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
1213 | break; | |
bf0fd768 CL |
1214 | case Opt_posix: |
1215 | mnt->flags |= NFS_MOUNT_POSIX; | |
1216 | break; | |
1217 | case Opt_noposix: | |
1218 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
1219 | break; | |
1220 | case Opt_cto: | |
1221 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
1222 | break; | |
1223 | case Opt_nocto: | |
1224 | mnt->flags |= NFS_MOUNT_NOCTO; | |
1225 | break; | |
1226 | case Opt_ac: | |
1227 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
1228 | break; | |
1229 | case Opt_noac: | |
1230 | mnt->flags |= NFS_MOUNT_NOAC; | |
1231 | break; | |
1232 | case Opt_lock: | |
1233 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1234 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
1235 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1236 | break; |
1237 | case Opt_nolock: | |
1238 | mnt->flags |= NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1239 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
1240 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 | 1241 | break; |
bf0fd768 CL |
1242 | case Opt_udp: |
1243 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1244 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1245 | break; |
1246 | case Opt_tcp: | |
1247 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1248 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1249 | break; |
2cf7ff7a TT |
1250 | case Opt_rdma: |
1251 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1252 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1253 | xprt_load_transport(p); |
2cf7ff7a | 1254 | break; |
bf0fd768 CL |
1255 | case Opt_acl: |
1256 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1257 | break; | |
1258 | case Opt_noacl: | |
1259 | mnt->flags |= NFS_MOUNT_NOACL; | |
1260 | break; | |
1261 | case Opt_rdirplus: | |
1262 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1263 | break; | |
1264 | case Opt_nordirplus: | |
1265 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1266 | break; | |
75180df2 TM |
1267 | case Opt_sharecache: |
1268 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1269 | break; | |
1270 | case Opt_nosharecache: | |
1271 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1272 | break; | |
d740351b CL |
1273 | case Opt_resvport: |
1274 | mnt->flags &= ~NFS_MOUNT_NORESVPORT; | |
1275 | break; | |
1276 | case Opt_noresvport: | |
1277 | mnt->flags |= NFS_MOUNT_NORESVPORT; | |
1278 | break; | |
b797cac7 DH |
1279 | case Opt_fscache: |
1280 | mnt->options |= NFS_OPTION_FSCACHE; | |
1281 | kfree(mnt->fscache_uniq); | |
1282 | mnt->fscache_uniq = NULL; | |
1283 | break; | |
1284 | case Opt_nofscache: | |
1285 | mnt->options &= ~NFS_OPTION_FSCACHE; | |
1286 | kfree(mnt->fscache_uniq); | |
1287 | mnt->fscache_uniq = NULL; | |
1288 | break; | |
bf0fd768 | 1289 | |
f45663ce CL |
1290 | /* |
1291 | * options that take numeric values | |
1292 | */ | |
bf0fd768 | 1293 | case Opt_port: |
c5cb09b6 RL |
1294 | if (nfs_get_option_ul(args, &option) || |
1295 | option > USHRT_MAX) | |
d23c45fd CL |
1296 | goto out_invalid_value; |
1297 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1298 | break; |
1299 | case Opt_rsize: | |
c5cb09b6 | 1300 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1301 | goto out_invalid_value; |
1302 | mnt->rsize = option; | |
bf0fd768 CL |
1303 | break; |
1304 | case Opt_wsize: | |
c5cb09b6 | 1305 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1306 | goto out_invalid_value; |
1307 | mnt->wsize = option; | |
bf0fd768 CL |
1308 | break; |
1309 | case Opt_bsize: | |
c5cb09b6 | 1310 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1311 | goto out_invalid_value; |
1312 | mnt->bsize = option; | |
bf0fd768 CL |
1313 | break; |
1314 | case Opt_timeo: | |
c5cb09b6 | 1315 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1316 | goto out_invalid_value; |
1317 | mnt->timeo = option; | |
bf0fd768 CL |
1318 | break; |
1319 | case Opt_retrans: | |
c5cb09b6 | 1320 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1321 | goto out_invalid_value; |
1322 | mnt->retrans = option; | |
bf0fd768 CL |
1323 | break; |
1324 | case Opt_acregmin: | |
c5cb09b6 | 1325 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1326 | goto out_invalid_value; |
1327 | mnt->acregmin = option; | |
bf0fd768 CL |
1328 | break; |
1329 | case Opt_acregmax: | |
c5cb09b6 | 1330 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1331 | goto out_invalid_value; |
1332 | mnt->acregmax = option; | |
bf0fd768 CL |
1333 | break; |
1334 | case Opt_acdirmin: | |
c5cb09b6 | 1335 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1336 | goto out_invalid_value; |
1337 | mnt->acdirmin = option; | |
bf0fd768 CL |
1338 | break; |
1339 | case Opt_acdirmax: | |
c5cb09b6 | 1340 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1341 | goto out_invalid_value; |
1342 | mnt->acdirmax = option; | |
bf0fd768 CL |
1343 | break; |
1344 | case Opt_actimeo: | |
c5cb09b6 | 1345 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1346 | goto out_invalid_value; |
1347 | mnt->acregmin = mnt->acregmax = | |
1348 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1349 | break; |
1350 | case Opt_namelen: | |
c5cb09b6 | 1351 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1352 | goto out_invalid_value; |
1353 | mnt->namlen = option; | |
bf0fd768 CL |
1354 | break; |
1355 | case Opt_mountport: | |
c5cb09b6 RL |
1356 | if (nfs_get_option_ul(args, &option) || |
1357 | option > USHRT_MAX) | |
d23c45fd CL |
1358 | goto out_invalid_value; |
1359 | mnt->mount_server.port = option; | |
bf0fd768 | 1360 | break; |
bf0fd768 | 1361 | case Opt_mountvers: |
c5cb09b6 | 1362 | if (nfs_get_option_ul(args, &option) || |
f45663ce | 1363 | option < NFS_MNT_VERSION || |
d23c45fd CL |
1364 | option > NFS_MNT3_VERSION) |
1365 | goto out_invalid_value; | |
1366 | mnt->mount_server.version = option; | |
bf0fd768 | 1367 | break; |
3fd5be9e | 1368 | case Opt_minorversion: |
c5cb09b6 | 1369 | if (nfs_get_option_ul(args, &option)) |
f3f4f4ed CL |
1370 | goto out_invalid_value; |
1371 | if (option > NFS4_MAX_MINOR_VERSION) | |
1372 | goto out_invalid_value; | |
1373 | mnt->minorversion = option; | |
3fd5be9e | 1374 | break; |
bf0fd768 | 1375 | |
f45663ce CL |
1376 | /* |
1377 | * options that take text values | |
1378 | */ | |
0d71b058 TM |
1379 | case Opt_nfsvers: |
1380 | string = match_strdup(args); | |
1381 | if (string == NULL) | |
1382 | goto out_nomem; | |
1383 | rc = nfs_parse_version_string(string, mnt, args); | |
1384 | kfree(string); | |
1385 | if (!rc) | |
1386 | goto out_invalid_value; | |
1387 | break; | |
bf0fd768 CL |
1388 | case Opt_sec: |
1389 | string = match_strdup(args); | |
1390 | if (string == NULL) | |
1391 | goto out_nomem; | |
01060c89 | 1392 | rc = nfs_parse_security_flavors(string, mnt); |
bf0fd768 | 1393 | kfree(string); |
f45663ce | 1394 | if (!rc) { |
f45663ce CL |
1395 | dfprintk(MOUNT, "NFS: unrecognized " |
1396 | "security flavor\n"); | |
d23c45fd | 1397 | return 0; |
f45663ce | 1398 | } |
bf0fd768 CL |
1399 | break; |
1400 | case Opt_proto: | |
1401 | string = match_strdup(args); | |
1402 | if (string == NULL) | |
1403 | goto out_nomem; | |
1404 | token = match_token(string, | |
1405 | nfs_xprt_protocol_tokens, args); | |
bf0fd768 | 1406 | |
ee671b01 | 1407 | protofamily = AF_INET; |
bf0fd768 | 1408 | switch (token) { |
ee671b01 JL |
1409 | case Opt_xprt_udp6: |
1410 | protofamily = AF_INET6; | |
fdb66ff4 | 1411 | case Opt_xprt_udp: |
bf0fd768 | 1412 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 1413 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1414 | break; |
ee671b01 JL |
1415 | case Opt_xprt_tcp6: |
1416 | protofamily = AF_INET6; | |
fdb66ff4 | 1417 | case Opt_xprt_tcp: |
bf0fd768 | 1418 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1419 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1420 | break; |
2cf7ff7a TT |
1421 | case Opt_xprt_rdma: |
1422 | /* vector side protocols to TCP */ | |
1423 | mnt->flags |= NFS_MOUNT_TCP; | |
1424 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1425 | xprt_load_transport(string); |
2cf7ff7a | 1426 | break; |
bf0fd768 | 1427 | default: |
f45663ce CL |
1428 | dfprintk(MOUNT, "NFS: unrecognized " |
1429 | "transport protocol\n"); | |
4223a4a1 | 1430 | kfree(string); |
d23c45fd | 1431 | return 0; |
bf0fd768 | 1432 | } |
c5cb09b6 | 1433 | kfree(string); |
bf0fd768 CL |
1434 | break; |
1435 | case Opt_mountproto: | |
1436 | string = match_strdup(args); | |
1437 | if (string == NULL) | |
1438 | goto out_nomem; | |
1439 | token = match_token(string, | |
1440 | nfs_xprt_protocol_tokens, args); | |
d508afb4 | 1441 | kfree(string); |
bf0fd768 | 1442 | |
ee671b01 | 1443 | mountfamily = AF_INET; |
bf0fd768 | 1444 | switch (token) { |
ee671b01 JL |
1445 | case Opt_xprt_udp6: |
1446 | mountfamily = AF_INET6; | |
fdb66ff4 | 1447 | case Opt_xprt_udp: |
0896a725 | 1448 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1449 | break; |
ee671b01 JL |
1450 | case Opt_xprt_tcp6: |
1451 | mountfamily = AF_INET6; | |
fdb66ff4 | 1452 | case Opt_xprt_tcp: |
0896a725 | 1453 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1454 | break; |
2cf7ff7a | 1455 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1456 | default: |
f45663ce CL |
1457 | dfprintk(MOUNT, "NFS: unrecognized " |
1458 | "transport protocol\n"); | |
d23c45fd | 1459 | return 0; |
bf0fd768 CL |
1460 | } |
1461 | break; | |
1462 | case Opt_addr: | |
1463 | string = match_strdup(args); | |
1464 | if (string == NULL) | |
1465 | goto out_nomem; | |
53a0b9c4 | 1466 | mnt->nfs_server.addrlen = |
b48e1278 | 1467 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1468 | (struct sockaddr *) |
1469 | &mnt->nfs_server.address, | |
1470 | sizeof(mnt->nfs_server.address)); | |
bf0fd768 | 1471 | kfree(string); |
53a0b9c4 CL |
1472 | if (mnt->nfs_server.addrlen == 0) |
1473 | goto out_invalid_address; | |
bf0fd768 CL |
1474 | break; |
1475 | case Opt_clientaddr: | |
c5cb09b6 | 1476 | if (nfs_get_option_str(args, &mnt->client_address)) |
bf0fd768 | 1477 | goto out_nomem; |
bf0fd768 | 1478 | break; |
33832034 | 1479 | case Opt_mounthost: |
c5cb09b6 RL |
1480 | if (nfs_get_option_str(args, |
1481 | &mnt->mount_server.hostname)) | |
33832034 | 1482 | goto out_nomem; |
33832034 | 1483 | break; |
0ac83779 | 1484 | case Opt_mountaddr: |
bf0fd768 CL |
1485 | string = match_strdup(args); |
1486 | if (string == NULL) | |
1487 | goto out_nomem; | |
53a0b9c4 | 1488 | mnt->mount_server.addrlen = |
b48e1278 | 1489 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1490 | (struct sockaddr *) |
1491 | &mnt->mount_server.address, | |
1492 | sizeof(mnt->mount_server.address)); | |
bf0fd768 | 1493 | kfree(string); |
53a0b9c4 CL |
1494 | if (mnt->mount_server.addrlen == 0) |
1495 | goto out_invalid_address; | |
bf0fd768 | 1496 | break; |
7973c1f1 TM |
1497 | case Opt_lookupcache: |
1498 | string = match_strdup(args); | |
1499 | if (string == NULL) | |
1500 | goto out_nomem; | |
1501 | token = match_token(string, | |
1502 | nfs_lookupcache_tokens, args); | |
1503 | kfree(string); | |
1504 | switch (token) { | |
1505 | case Opt_lookupcache_all: | |
1506 | mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); | |
1507 | break; | |
1508 | case Opt_lookupcache_positive: | |
1509 | mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1510 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; | |
1511 | break; | |
1512 | case Opt_lookupcache_none: | |
1513 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1514 | break; | |
1515 | default: | |
7973c1f1 TM |
1516 | dfprintk(MOUNT, "NFS: invalid " |
1517 | "lookupcache argument\n"); | |
d23c45fd | 1518 | return 0; |
7973c1f1 TM |
1519 | }; |
1520 | break; | |
a6d5ff64 | 1521 | case Opt_fscache_uniq: |
c5cb09b6 | 1522 | if (nfs_get_option_str(args, &mnt->fscache_uniq)) |
a6d5ff64 | 1523 | goto out_nomem; |
a6d5ff64 CL |
1524 | mnt->options |= NFS_OPTION_FSCACHE; |
1525 | break; | |
5eebde23 SJ |
1526 | case Opt_local_lock: |
1527 | string = match_strdup(args); | |
1528 | if (string == NULL) | |
1529 | goto out_nomem; | |
1530 | token = match_token(string, nfs_local_lock_tokens, | |
1531 | args); | |
1532 | kfree(string); | |
1533 | switch (token) { | |
1534 | case Opt_local_lock_all: | |
1535 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | | |
1536 | NFS_MOUNT_LOCAL_FCNTL); | |
1537 | break; | |
1538 | case Opt_local_lock_flock: | |
1539 | mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; | |
1540 | break; | |
1541 | case Opt_local_lock_posix: | |
1542 | mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; | |
1543 | break; | |
1544 | case Opt_local_lock_none: | |
1545 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | | |
1546 | NFS_MOUNT_LOCAL_FCNTL); | |
1547 | break; | |
1548 | default: | |
1549 | dfprintk(MOUNT, "NFS: invalid " | |
1550 | "local_lock argument\n"); | |
1551 | return 0; | |
1552 | }; | |
1553 | break; | |
bf0fd768 | 1554 | |
f45663ce CL |
1555 | /* |
1556 | * Special options | |
1557 | */ | |
1558 | case Opt_sloppy: | |
1559 | sloppy = 1; | |
1560 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1561 | break; | |
bf0fd768 CL |
1562 | case Opt_userspace: |
1563 | case Opt_deprecated: | |
d33e4dfe CL |
1564 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1565 | "'%s'\n", p); | |
bf0fd768 CL |
1566 | break; |
1567 | ||
1568 | default: | |
d23c45fd | 1569 | invalid_option = 1; |
f45663ce CL |
1570 | dfprintk(MOUNT, "NFS: unrecognized mount option " |
1571 | "'%s'\n", p); | |
bf0fd768 CL |
1572 | } |
1573 | } | |
1574 | ||
d23c45fd CL |
1575 | if (!sloppy && invalid_option) |
1576 | return 0; | |
1577 | ||
571b7554 WAA |
1578 | if (mnt->minorversion && mnt->version != 4) |
1579 | goto out_minorversion_mismatch; | |
1580 | ||
ee671b01 JL |
1581 | /* |
1582 | * verify that any proto=/mountproto= options match the address | |
1583 | * familiies in the addr=/mountaddr= options. | |
1584 | */ | |
1585 | if (protofamily != AF_UNSPEC && | |
1586 | protofamily != mnt->nfs_server.address.ss_family) | |
1587 | goto out_proto_mismatch; | |
1588 | ||
1589 | if (mountfamily != AF_UNSPEC) { | |
1590 | if (mnt->mount_server.addrlen) { | |
1591 | if (mountfamily != mnt->mount_server.address.ss_family) | |
1592 | goto out_mountproto_mismatch; | |
1593 | } else { | |
1594 | if (mountfamily != mnt->nfs_server.address.ss_family) | |
1595 | goto out_mountproto_mismatch; | |
1596 | } | |
1597 | } | |
1598 | ||
bf0fd768 CL |
1599 | return 1; |
1600 | ||
ee671b01 JL |
1601 | out_mountproto_mismatch: |
1602 | printk(KERN_INFO "NFS: mount server address does not match mountproto= " | |
1603 | "option\n"); | |
1604 | return 0; | |
1605 | out_proto_mismatch: | |
1606 | printk(KERN_INFO "NFS: server address does not match proto= option\n"); | |
1607 | return 0; | |
53a0b9c4 CL |
1608 | out_invalid_address: |
1609 | printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); | |
1610 | return 0; | |
d23c45fd | 1611 | out_invalid_value: |
53a0b9c4 | 1612 | printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
d23c45fd | 1613 | return 0; |
571b7554 WAA |
1614 | out_minorversion_mismatch: |
1615 | printk(KERN_INFO "NFS: mount option vers=%u does not support " | |
1616 | "minorversion=%u\n", mnt->version, mnt->minorversion); | |
1617 | return 0; | |
bf0fd768 CL |
1618 | out_nomem: |
1619 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1620 | return 0; | |
f9c3a380 EP |
1621 | out_security_failure: |
1622 | free_secdata(secdata); | |
1623 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1624 | return 0; | |
bf0fd768 CL |
1625 | } |
1626 | ||
ec88f28d CL |
1627 | /* |
1628 | * Match the requested auth flavors with the list returned by | |
1629 | * the server. Returns zero and sets the mount's authentication | |
1630 | * flavor on success; returns -EACCES if server does not support | |
1631 | * the requested flavor. | |
1632 | */ | |
1633 | static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, | |
1634 | struct nfs_mount_request *request) | |
1635 | { | |
1636 | unsigned int i, j, server_authlist_len = *(request->auth_flav_len); | |
1637 | ||
5eecfde6 CL |
1638 | /* |
1639 | * Certain releases of Linux's mountd return an empty | |
1640 | * flavor list. To prevent behavioral regression with | |
1641 | * these servers (ie. rejecting mounts that used to | |
1642 | * succeed), revert to pre-2.6.32 behavior (no checking) | |
1643 | * if the returned flavor list is empty. | |
1644 | */ | |
1645 | if (server_authlist_len == 0) | |
1646 | return 0; | |
1647 | ||
ec88f28d CL |
1648 | /* |
1649 | * We avoid sophisticated negotiating here, as there are | |
1650 | * plenty of cases where we can get it wrong, providing | |
1651 | * either too little or too much security. | |
1652 | * | |
1653 | * RFC 2623, section 2.7 suggests we SHOULD prefer the | |
1654 | * flavor listed first. However, some servers list | |
1655 | * AUTH_NULL first. Our caller plants AUTH_SYS, the | |
1656 | * preferred default, in args->auth_flavors[0] if user | |
1657 | * didn't specify sec= mount option. | |
1658 | */ | |
1659 | for (i = 0; i < args->auth_flavor_len; i++) | |
1660 | for (j = 0; j < server_authlist_len; j++) | |
1661 | if (args->auth_flavors[i] == request->auth_flavs[j]) { | |
1662 | dfprintk(MOUNT, "NFS: using auth flavor %d\n", | |
1663 | request->auth_flavs[j]); | |
1664 | args->auth_flavors[0] = request->auth_flavs[j]; | |
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); | |
1669 | nfs_umount(request); | |
1670 | return -EACCES; | |
1671 | } | |
1672 | ||
0076d7b7 CL |
1673 | /* |
1674 | * Use the remote server's MOUNT service to request the NFS file handle | |
1675 | * corresponding to the provided path. | |
1676 | */ | |
1677 | static int nfs_try_mount(struct nfs_parsed_mount_data *args, | |
1678 | struct nfs_fh *root_fh) | |
1679 | { | |
ec88f28d CL |
1680 | rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
1681 | unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); | |
c5d120f8 CL |
1682 | struct nfs_mount_request request = { |
1683 | .sap = (struct sockaddr *) | |
1684 | &args->mount_server.address, | |
1685 | .dirpath = args->nfs_server.export_path, | |
1686 | .protocol = args->mount_server.protocol, | |
1687 | .fh = root_fh, | |
50a737f8 | 1688 | .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
ec88f28d CL |
1689 | .auth_flav_len = &server_authlist_len, |
1690 | .auth_flavs = server_authlist, | |
6d59b8d5 | 1691 | .net = args->net, |
c5d120f8 | 1692 | }; |
4c568017 | 1693 | int status; |
0076d7b7 CL |
1694 | |
1695 | if (args->mount_server.version == 0) { | |
8a6e5deb TM |
1696 | switch (args->version) { |
1697 | default: | |
1698 | args->mount_server.version = NFS_MNT3_VERSION; | |
1699 | break; | |
1700 | case 2: | |
1701 | args->mount_server.version = NFS_MNT_VERSION; | |
1702 | } | |
0076d7b7 | 1703 | } |
c5d120f8 | 1704 | request.version = args->mount_server.version; |
0076d7b7 | 1705 | |
33832034 | 1706 | if (args->mount_server.hostname) |
c5d120f8 | 1707 | request.hostname = args->mount_server.hostname; |
33832034 | 1708 | else |
c5d120f8 | 1709 | request.hostname = args->nfs_server.hostname; |
33832034 | 1710 | |
0076d7b7 CL |
1711 | /* |
1712 | * Construct the mount server's address. | |
1713 | */ | |
4c568017 | 1714 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
c5d120f8 | 1715 | memcpy(request.sap, &args->nfs_server.address, |
4c568017 CL |
1716 | args->nfs_server.addrlen); |
1717 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1718 | } | |
c5d120f8 | 1719 | request.salen = args->mount_server.addrlen; |
f5855fec | 1720 | nfs_set_port(request.sap, &args->mount_server.port, 0); |
0076d7b7 CL |
1721 | |
1722 | /* | |
1723 | * Now ask the mount server to map our export path | |
1724 | * to a file handle. | |
1725 | */ | |
c5d120f8 | 1726 | status = nfs_mount(&request); |
ec88f28d CL |
1727 | if (status != 0) { |
1728 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", | |
1729 | request.hostname, status); | |
1730 | return status; | |
1731 | } | |
0076d7b7 | 1732 | |
ec88f28d CL |
1733 | /* |
1734 | * MNTv1 (NFSv2) does not support auth flavor negotiation. | |
1735 | */ | |
1736 | if (args->mount_server.version != NFS_MNT3_VERSION) | |
1737 | return 0; | |
1738 | return nfs_walk_authlist(args, &request); | |
0076d7b7 CL |
1739 | } |
1740 | ||
c12bacec RL |
1741 | /* |
1742 | * Split "dev_name" into "hostname:export_path". | |
1743 | * | |
1744 | * The leftmost colon demarks the split between the server's hostname | |
1745 | * and the export path. If the hostname starts with a left square | |
1746 | * bracket, then it may contain colons. | |
1747 | * | |
1748 | * Note: caller frees hostname and export path, even on error. | |
1749 | */ | |
1750 | static int nfs_parse_devname(const char *dev_name, | |
1751 | char **hostname, size_t maxnamlen, | |
1752 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1753 | { |
1754 | size_t len; | |
c12bacec | 1755 | char *end; |
dc045898 | 1756 | |
c12bacec RL |
1757 | /* Is the host name protected with square brakcets? */ |
1758 | if (*dev_name == '[') { | |
1759 | end = strchr(++dev_name, ']'); | |
1760 | if (end == NULL || end[1] != ':') | |
dc045898 | 1761 | goto out_bad_devname; |
dc045898 | 1762 | |
c12bacec RL |
1763 | len = end - dev_name; |
1764 | end++; | |
1765 | } else { | |
1766 | char *comma; | |
dc045898 | 1767 | |
c12bacec RL |
1768 | end = strchr(dev_name, ':'); |
1769 | if (end == NULL) | |
1770 | goto out_bad_devname; | |
1771 | len = end - dev_name; | |
d1aa0825 | 1772 | |
c12bacec RL |
1773 | /* kill possible hostname list: not supported */ |
1774 | comma = strchr(dev_name, ','); | |
1775 | if (comma != NULL && comma < end) | |
1776 | *comma = 0; | |
1777 | } | |
d1aa0825 | 1778 | |
d1aa0825 CL |
1779 | if (len > maxnamlen) |
1780 | goto out_hostname; | |
1781 | ||
1782 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
c12bacec | 1783 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); |
d1aa0825 CL |
1784 | if (*hostname == NULL) |
1785 | goto out_nomem; | |
c12bacec | 1786 | len = strlen(++end); |
d1aa0825 CL |
1787 | if (len > maxpathlen) |
1788 | goto out_path; | |
1789 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1790 | if (!*export_path) | |
1791 | goto out_nomem; | |
1792 | ||
c12bacec | 1793 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); |
d1aa0825 CL |
1794 | return 0; |
1795 | ||
1796 | out_bad_devname: | |
1797 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1798 | return -EINVAL; | |
1799 | ||
1800 | out_nomem: | |
1801 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1802 | return -ENOMEM; | |
1803 | ||
1804 | out_hostname: | |
1805 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1806 | return -ENAMETOOLONG; | |
1807 | ||
1808 | out_path: | |
1809 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1810 | return -ENAMETOOLONG; | |
1811 | } | |
1812 | ||
f7b422b1 | 1813 | /* |
54ceac45 DH |
1814 | * Validate the NFS2/NFS3 mount data |
1815 | * - fills in the mount root filehandle | |
136d558c CL |
1816 | * |
1817 | * For option strings, user space handles the following behaviors: | |
1818 | * | |
1819 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1820 | * | |
1821 | * + failure mode: how to behave if a mount request can't be handled | |
1822 | * immediately ("fg/bg" option) | |
1823 | * | |
1824 | * + retry: how often to retry a mount request ("retry=" option) | |
1825 | * | |
1826 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1827 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1828 | */ |
2283f8d6 TT |
1829 | static int nfs_validate_mount_data(void *options, |
1830 | struct nfs_parsed_mount_data *args, | |
136d558c CL |
1831 | struct nfs_fh *mntfh, |
1832 | const char *dev_name) | |
f7b422b1 | 1833 | { |
2283f8d6 | 1834 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
4cfd74fc | 1835 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
136d558c | 1836 | |
5df36e78 CL |
1837 | if (data == NULL) |
1838 | goto out_no_data; | |
f7b422b1 | 1839 | |
54ceac45 | 1840 | switch (data->version) { |
5df36e78 CL |
1841 | case 1: |
1842 | data->namlen = 0; | |
1843 | case 2: | |
1844 | data->bsize = 0; | |
1845 | case 3: | |
1846 | if (data->flags & NFS_MOUNT_VER3) | |
1847 | goto out_no_v3; | |
1848 | data->root.size = NFS2_FHSIZE; | |
1849 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1850 | case 4: | |
1851 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1852 | goto out_no_sec; | |
1853 | case 5: | |
1854 | memset(data->context, 0, sizeof(data->context)); | |
1855 | case 6: | |
b7e24457 TM |
1856 | if (data->flags & NFS_MOUNT_VER3) { |
1857 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1858 | goto out_invalid_fh; | |
5df36e78 | 1859 | mntfh->size = data->root.size; |
764302cc CL |
1860 | args->version = 3; |
1861 | } else { | |
5df36e78 | 1862 | mntfh->size = NFS2_FHSIZE; |
764302cc CL |
1863 | args->version = 2; |
1864 | } | |
5df36e78 | 1865 | |
5df36e78 CL |
1866 | |
1867 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1868 | if (mntfh->size < sizeof(mntfh->data)) | |
1869 | memset(mntfh->data + mntfh->size, 0, | |
1870 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1871 | |
2283f8d6 TT |
1872 | /* |
1873 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1874 | * can deal with. | |
1875 | */ | |
ff3525a5 | 1876 | args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
d5eff1a3 | 1877 | args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
2283f8d6 TT |
1878 | args->rsize = data->rsize; |
1879 | args->wsize = data->wsize; | |
2283f8d6 TT |
1880 | args->timeo = data->timeo; |
1881 | args->retrans = data->retrans; | |
1882 | args->acregmin = data->acregmin; | |
1883 | args->acregmax = data->acregmax; | |
1884 | args->acdirmin = data->acdirmin; | |
1885 | args->acdirmax = data->acdirmax; | |
4c568017 | 1886 | |
4cfd74fc | 1887 | memcpy(sap, &data->addr, sizeof(data->addr)); |
4c568017 | 1888 | args->nfs_server.addrlen = sizeof(data->addr); |
4cfd74fc | 1889 | if (!nfs_verify_server_address(sap)) |
4c568017 CL |
1890 | goto out_no_address; |
1891 | ||
2283f8d6 | 1892 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1893 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1894 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1895 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1896 | args->namlen = data->namlen; | |
1897 | args->bsize = data->bsize; | |
dd07c947 CL |
1898 | |
1899 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1900 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1901 | if (!args->nfs_server.hostname) |
1902 | goto out_nomem; | |
f9c3a380 | 1903 | |
5eebde23 SJ |
1904 | if (!(data->flags & NFS_MOUNT_NONLM)) |
1905 | args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| | |
1906 | NFS_MOUNT_LOCAL_FCNTL); | |
1907 | else | |
1908 | args->flags |= (NFS_MOUNT_LOCAL_FLOCK| | |
1909 | NFS_MOUNT_LOCAL_FCNTL); | |
f9c3a380 EP |
1910 | /* |
1911 | * The legacy version 6 binary mount data from userspace has a | |
1912 | * field used only to transport selinux information into the | |
1913 | * the kernel. To continue to support that functionality we | |
1914 | * have a touch of selinux knowledge here in the NFS code. The | |
1915 | * userspace code converted context=blah to just blah so we are | |
1916 | * converting back to the full string selinux understands. | |
1917 | */ | |
1918 | if (data->context[0]){ | |
1919 | #ifdef CONFIG_SECURITY_SELINUX | |
1920 | int rc; | |
1921 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1922 | if (!opts_str) | |
1923 | return -ENOMEM; | |
1924 | strcpy(opts_str, "context="); | |
1925 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1926 | strcat(opts_str, &data->context[0]); | |
1927 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1928 | kfree(opts_str); | |
1929 | if (rc) | |
1930 | return rc; | |
1931 | #else | |
1932 | return -EINVAL; | |
1933 | #endif | |
1934 | } | |
1935 | ||
5df36e78 | 1936 | break; |
136d558c | 1937 | default: { |
136d558c | 1938 | int status; |
136d558c | 1939 | |
2283f8d6 TT |
1940 | if (nfs_parse_mount_options((char *)options, args) == 0) |
1941 | return -EINVAL; | |
136d558c | 1942 | |
4cfd74fc | 1943 | if (!nfs_verify_server_address(sap)) |
6e88e061 CL |
1944 | goto out_no_address; |
1945 | ||
764302cc CL |
1946 | if (args->version == 4) |
1947 | #ifdef CONFIG_NFS_V4 | |
1948 | return nfs4_validate_text_mount_data(options, | |
1949 | args, dev_name); | |
1950 | #else | |
1951 | goto out_v4_not_compiled; | |
1952 | #endif | |
1953 | ||
f5855fec | 1954 | nfs_set_port(sap, &args->nfs_server.port, 0); |
ed596a8a | 1955 | |
259875ef TM |
1956 | nfs_set_mount_transport_protocol(args); |
1957 | ||
dc045898 CL |
1958 | status = nfs_parse_devname(dev_name, |
1959 | &args->nfs_server.hostname, | |
1960 | PAGE_SIZE, | |
1961 | &args->nfs_server.export_path, | |
1962 | NFS_MAXPATHLEN); | |
1963 | if (!status) | |
1964 | status = nfs_try_mount(args, mntfh); | |
136d558c | 1965 | |
dc045898 CL |
1966 | kfree(args->nfs_server.export_path); |
1967 | args->nfs_server.export_path = NULL; | |
136d558c | 1968 | |
136d558c | 1969 | if (status) |
fdc6e2c8 | 1970 | return status; |
136d558c | 1971 | |
136d558c CL |
1972 | break; |
1973 | } | |
f7b422b1 | 1974 | } |
54ceac45 DH |
1975 | |
1976 | #ifndef CONFIG_NFS_V3 | |
8a6e5deb | 1977 | if (args->version == 3) |
5df36e78 CL |
1978 | goto out_v3_not_compiled; |
1979 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1980 | |
5df36e78 | 1981 | return 0; |
f7b422b1 | 1982 | |
5df36e78 CL |
1983 | out_no_data: |
1984 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1985 | return -EINVAL; | |
54ceac45 | 1986 | |
5df36e78 CL |
1987 | out_no_v3: |
1988 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1989 | data->version); | |
1990 | return -EINVAL; | |
f7b422b1 | 1991 | |
5df36e78 CL |
1992 | out_no_sec: |
1993 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1994 | return -EINVAL; | |
1995 | ||
5df36e78 CL |
1996 | #ifndef CONFIG_NFS_V3 |
1997 | out_v3_not_compiled: | |
1998 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1999 | return -EPROTONOSUPPORT; | |
2000 | #endif /* !CONFIG_NFS_V3 */ | |
2001 | ||
764302cc CL |
2002 | #ifndef CONFIG_NFS_V4 |
2003 | out_v4_not_compiled: | |
2004 | dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); | |
2005 | return -EPROTONOSUPPORT; | |
2006 | #endif /* !CONFIG_NFS_V4 */ | |
2007 | ||
63649bd7 CG |
2008 | out_nomem: |
2009 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
2010 | return -ENOMEM; | |
2011 | ||
5df36e78 CL |
2012 | out_no_address: |
2013 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2014 | return -EINVAL; | |
2015 | ||
2016 | out_invalid_fh: | |
2017 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
2018 | return -EINVAL; | |
f7b422b1 DH |
2019 | } |
2020 | ||
48b605f8 JL |
2021 | static int |
2022 | nfs_compare_remount_data(struct nfs_server *nfss, | |
2023 | struct nfs_parsed_mount_data *data) | |
2024 | { | |
2025 | if (data->flags != nfss->flags || | |
2026 | data->rsize != nfss->rsize || | |
2027 | data->wsize != nfss->wsize || | |
2028 | data->retrans != nfss->client->cl_timeout->to_retries || | |
2029 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
2030 | data->acregmin != nfss->acregmin / HZ || | |
2031 | data->acregmax != nfss->acregmax / HZ || | |
2032 | data->acdirmin != nfss->acdirmin / HZ || | |
2033 | data->acdirmax != nfss->acdirmax / HZ || | |
2034 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
bcd2ea17 | 2035 | data->nfs_server.port != nfss->port || |
48b605f8 | 2036 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
a1be9eee SR |
2037 | !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
2038 | (struct sockaddr *)&nfss->nfs_client->cl_addr)) | |
48b605f8 JL |
2039 | return -EINVAL; |
2040 | ||
2041 | return 0; | |
2042 | } | |
2043 | ||
2044 | static int | |
2045 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
2046 | { | |
2047 | int error; | |
2048 | struct nfs_server *nfss = sb->s_fs_info; | |
2049 | struct nfs_parsed_mount_data *data; | |
2050 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
2051 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 2052 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
2053 | |
2054 | /* | |
2055 | * Userspace mount programs that send binary options generally send | |
2056 | * them populated with default values. We have no way to know which | |
2057 | * ones were explicitly specified. Fall back to legacy behavior and | |
2058 | * just return success. | |
2059 | */ | |
31c94469 MZ |
2060 | if ((nfsvers == 4 && (!options4 || options4->version == 1)) || |
2061 | (nfsvers <= 3 && (!options || (options->version >= 1 && | |
2062 | options->version <= 6)))) | |
48b605f8 JL |
2063 | return 0; |
2064 | ||
2065 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2066 | if (data == NULL) | |
2067 | return -ENOMEM; | |
2068 | ||
2069 | /* fill out struct with values from existing mount */ | |
2070 | data->flags = nfss->flags; | |
2071 | data->rsize = nfss->rsize; | |
2072 | data->wsize = nfss->wsize; | |
2073 | data->retrans = nfss->client->cl_timeout->to_retries; | |
2074 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
2075 | data->acregmin = nfss->acregmin / HZ; | |
2076 | data->acregmax = nfss->acregmax / HZ; | |
2077 | data->acdirmin = nfss->acdirmin / HZ; | |
2078 | data->acdirmax = nfss->acdirmax / HZ; | |
2079 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
bcd2ea17 | 2080 | data->nfs_server.port = nfss->port; |
48b605f8 JL |
2081 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
2082 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
2083 | data->nfs_server.addrlen); | |
2084 | ||
2085 | /* overwrite those values with any that were specified */ | |
2086 | error = nfs_parse_mount_options((char *)options, data); | |
2087 | if (error < 0) | |
2088 | goto out; | |
2089 | ||
26c4c170 JL |
2090 | /* |
2091 | * noac is a special case. It implies -o sync, but that's not | |
2092 | * necessarily reflected in the mtab options. do_remount_sb | |
2093 | * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the | |
2094 | * remount options, so we have to explicitly reset it. | |
2095 | */ | |
2096 | if (data->flags & NFS_MOUNT_NOAC) | |
2097 | *flags |= MS_SYNCHRONOUS; | |
2098 | ||
48b605f8 JL |
2099 | /* compare new mount options with old ones */ |
2100 | error = nfs_compare_remount_data(nfss, data); | |
2101 | out: | |
2102 | kfree(data); | |
2103 | return error; | |
2104 | } | |
2105 | ||
f7b422b1 | 2106 | /* |
54ceac45 | 2107 | * Initialise the common bits of the superblock |
f7b422b1 | 2108 | */ |
54ceac45 | 2109 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 2110 | { |
54ceac45 | 2111 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2112 | |
54ceac45 | 2113 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 2114 | |
54ceac45 DH |
2115 | /* We probably want something more informative here */ |
2116 | snprintf(sb->s_id, sizeof(sb->s_id), | |
5a7c9eec | 2117 | "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
5006a76c | 2118 | |
54ceac45 DH |
2119 | if (sb->s_blocksize == 0) |
2120 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
2121 | &sb->s_blocksize_bits); | |
f7b422b1 | 2122 | |
32a88aa1 JA |
2123 | sb->s_bdi = &server->backing_dev_info; |
2124 | ||
54ceac45 | 2125 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
2126 | } |
2127 | ||
2128 | /* | |
54ceac45 | 2129 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 2130 | */ |
2283f8d6 TT |
2131 | static void nfs_fill_super(struct super_block *sb, |
2132 | struct nfs_parsed_mount_data *data) | |
f7b422b1 DH |
2133 | { |
2134 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 2135 | |
54ceac45 DH |
2136 | sb->s_blocksize_bits = 0; |
2137 | sb->s_blocksize = 0; | |
2138 | if (data->bsize) | |
2139 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 2140 | |
8a6e5deb | 2141 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2142 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2143 | * so ourselves when necessary. | |
2144 | */ | |
2145 | sb->s_flags |= MS_POSIXACL; | |
2146 | sb->s_time_gran = 1; | |
816724e6 | 2147 | } |
54ceac45 DH |
2148 | |
2149 | sb->s_op = &nfs_sops; | |
2150 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2151 | } |
2152 | ||
2153 | /* | |
54ceac45 | 2154 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 2155 | */ |
54ceac45 DH |
2156 | static void nfs_clone_super(struct super_block *sb, |
2157 | const struct super_block *old_sb) | |
f7b422b1 | 2158 | { |
54ceac45 DH |
2159 | struct nfs_server *server = NFS_SB(sb); |
2160 | ||
2161 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
2162 | sb->s_blocksize = old_sb->s_blocksize; | |
2163 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2164 | |
8a6e5deb | 2165 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2166 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2167 | * so ourselves when necessary. | |
f7b422b1 DH |
2168 | */ |
2169 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 2170 | sb->s_time_gran = 1; |
f7b422b1 DH |
2171 | } |
2172 | ||
54ceac45 DH |
2173 | sb->s_op = old_sb->s_op; |
2174 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2175 | } |
2176 | ||
275a5d24 TM |
2177 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) |
2178 | { | |
2179 | const struct nfs_server *a = s->s_fs_info; | |
2180 | const struct rpc_clnt *clnt_a = a->client; | |
2181 | const struct rpc_clnt *clnt_b = b->client; | |
2182 | ||
2183 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
2184 | goto Ebusy; | |
2185 | if (a->nfs_client != b->nfs_client) | |
2186 | goto Ebusy; | |
2187 | if (a->flags != b->flags) | |
2188 | goto Ebusy; | |
2189 | if (a->wsize != b->wsize) | |
2190 | goto Ebusy; | |
2191 | if (a->rsize != b->rsize) | |
2192 | goto Ebusy; | |
2193 | if (a->acregmin != b->acregmin) | |
2194 | goto Ebusy; | |
2195 | if (a->acregmax != b->acregmax) | |
2196 | goto Ebusy; | |
2197 | if (a->acdirmin != b->acdirmin) | |
2198 | goto Ebusy; | |
2199 | if (a->acdirmax != b->acdirmax) | |
2200 | goto Ebusy; | |
2201 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
2202 | goto Ebusy; | |
e89a5a43 | 2203 | return 1; |
275a5d24 | 2204 | Ebusy: |
e89a5a43 TM |
2205 | return 0; |
2206 | } | |
2207 | ||
2208 | struct nfs_sb_mountdata { | |
2209 | struct nfs_server *server; | |
2210 | int mntflags; | |
2211 | }; | |
2212 | ||
2213 | static int nfs_set_super(struct super_block *s, void *data) | |
2214 | { | |
2215 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2216 | struct nfs_server *server = sb_mntdata->server; | |
2217 | int ret; | |
2218 | ||
2219 | s->s_flags = sb_mntdata->mntflags; | |
2220 | s->s_fs_info = server; | |
8b244ff2 | 2221 | s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
e89a5a43 TM |
2222 | ret = set_anon_super(s, server); |
2223 | if (ret == 0) | |
2224 | server->s_dev = s->s_dev; | |
2225 | return ret; | |
2226 | } | |
2227 | ||
fd00a8ff CL |
2228 | static int nfs_compare_super_address(struct nfs_server *server1, |
2229 | struct nfs_server *server2) | |
2230 | { | |
2231 | struct sockaddr *sap1, *sap2; | |
2232 | ||
2233 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
2234 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
2235 | ||
2236 | if (sap1->sa_family != sap2->sa_family) | |
2237 | return 0; | |
2238 | ||
2239 | switch (sap1->sa_family) { | |
2240 | case AF_INET: { | |
2241 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
2242 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
2243 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
2244 | return 0; | |
2245 | if (sin1->sin_port != sin2->sin_port) | |
2246 | return 0; | |
2247 | break; | |
2248 | } | |
2249 | case AF_INET6: { | |
2250 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
2251 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
2252 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
2253 | return 0; | |
2254 | if (sin1->sin6_port != sin2->sin6_port) | |
2255 | return 0; | |
2256 | break; | |
2257 | } | |
2258 | default: | |
2259 | return 0; | |
2260 | } | |
2261 | ||
2262 | return 1; | |
2263 | } | |
2264 | ||
e89a5a43 TM |
2265 | static int nfs_compare_super(struct super_block *sb, void *data) |
2266 | { | |
2267 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2268 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
2269 | int mntflags = sb_mntdata->mntflags; | |
2270 | ||
fd00a8ff | 2271 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
2272 | return 0; |
2273 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
2274 | if (old->flags & NFS_MOUNT_UNSHARED) | |
2275 | return 0; | |
2276 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
2277 | return 0; | |
2278 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
2279 | } |
2280 | ||
2311b943 BS |
2281 | static void nfs_get_cache_cookie(struct super_block *sb, |
2282 | struct nfs_parsed_mount_data *parsed, | |
2283 | struct nfs_clone_mount *cloned) | |
2284 | { | |
2285 | char *uniq = NULL; | |
2286 | int ulen = 0; | |
2287 | ||
2288 | if (parsed && parsed->fscache_uniq) { | |
2289 | uniq = parsed->fscache_uniq; | |
2290 | ulen = strlen(parsed->fscache_uniq); | |
2291 | } else if (cloned) { | |
2292 | struct nfs_server *mnt_s = NFS_SB(cloned->sb); | |
2293 | if (mnt_s->fscache_key) { | |
2294 | uniq = mnt_s->fscache_key->key.uniquifier; | |
2295 | ulen = mnt_s->fscache_key->key.uniq_len; | |
2296 | }; | |
2297 | } | |
2298 | ||
2299 | nfs_fscache_get_super_cookie(sb, uniq, ulen); | |
2300 | } | |
2301 | ||
fa799759 MS |
2302 | static int nfs_bdi_register(struct nfs_server *server) |
2303 | { | |
2304 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
2305 | } | |
2306 | ||
01194981 AV |
2307 | static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, |
2308 | int flags, const char *dev_name, void *raw_data) | |
f7b422b1 | 2309 | { |
f7b422b1 DH |
2310 | struct nfs_server *server = NULL; |
2311 | struct super_block *s; | |
33852a1f TM |
2312 | struct nfs_parsed_mount_data *data; |
2313 | struct nfs_fh *mntfh; | |
01194981 | 2314 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
75180df2 | 2315 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2316 | struct nfs_sb_mountdata sb_mntdata = { |
2317 | .mntflags = flags, | |
2318 | }; | |
01194981 | 2319 | int error; |
33852a1f | 2320 | |
1e657bd5 | 2321 | data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); |
b157b06c | 2322 | mntfh = nfs_alloc_fhandle(); |
33852a1f | 2323 | if (data == NULL || mntfh == NULL) |
8a0d551a | 2324 | goto out; |
f9c3a380 | 2325 | |
54ceac45 | 2326 | /* Validate the mount data */ |
33852a1f | 2327 | error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); |
01194981 AV |
2328 | if (error < 0) { |
2329 | mntroot = ERR_PTR(error); | |
0655960f | 2330 | goto out; |
01194981 | 2331 | } |
f7b422b1 | 2332 | |
764302cc CL |
2333 | #ifdef CONFIG_NFS_V4 |
2334 | if (data->version == 4) { | |
01194981 | 2335 | mntroot = nfs4_try_mount(flags, dev_name, data); |
764302cc CL |
2336 | goto out; |
2337 | } | |
2338 | #endif /* CONFIG_NFS_V4 */ | |
2339 | ||
54ceac45 | 2340 | /* Get a volume representation */ |
33852a1f | 2341 | server = nfs_create_server(data, mntfh); |
54ceac45 | 2342 | if (IS_ERR(server)) { |
01194981 | 2343 | mntroot = ERR_CAST(server); |
0655960f | 2344 | goto out; |
f7b422b1 | 2345 | } |
e89a5a43 | 2346 | sb_mntdata.server = server; |
f7b422b1 | 2347 | |
75180df2 TM |
2348 | if (server->flags & NFS_MOUNT_UNSHARED) |
2349 | compare_super = NULL; | |
2350 | ||
fb2088cc SP |
2351 | /* -o noac implies -o sync */ |
2352 | if (server->flags & NFS_MOUNT_NOAC) | |
2353 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2354 | ||
54ceac45 | 2355 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2356 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 | 2357 | if (IS_ERR(s)) { |
01194981 | 2358 | mntroot = ERR_CAST(s); |
54ceac45 | 2359 | goto out_err_nosb; |
816724e6 TM |
2360 | } |
2361 | ||
54ceac45 DH |
2362 | if (s->s_fs_info != server) { |
2363 | nfs_free_server(server); | |
2364 | server = NULL; | |
fa799759 MS |
2365 | } else { |
2366 | error = nfs_bdi_register(server); | |
01194981 AV |
2367 | if (error) { |
2368 | mntroot = ERR_PTR(error); | |
cfbc0683 | 2369 | goto error_splat_bdi; |
01194981 | 2370 | } |
54ceac45 | 2371 | } |
f7b422b1 | 2372 | |
54ceac45 DH |
2373 | if (!s->s_root) { |
2374 | /* initial superblock/root creation */ | |
33852a1f | 2375 | nfs_fill_super(s, data); |
2311b943 | 2376 | nfs_get_cache_cookie(s, data, NULL); |
54ceac45 | 2377 | } |
f7b422b1 | 2378 | |
0d5839ad | 2379 | mntroot = nfs_get_root(s, mntfh, dev_name); |
01194981 | 2380 | if (IS_ERR(mntroot)) |
54ceac45 | 2381 | goto error_splat_super; |
816724e6 | 2382 | |
33852a1f | 2383 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
f9c3a380 EP |
2384 | if (error) |
2385 | goto error_splat_root; | |
2386 | ||
54ceac45 | 2387 | s->s_flags |= MS_ACTIVE; |
0655960f CL |
2388 | |
2389 | out: | |
8a0d551a | 2390 | nfs_free_parsed_mount_data(data); |
b157b06c | 2391 | nfs_free_fhandle(mntfh); |
01194981 | 2392 | return mntroot; |
816724e6 | 2393 | |
54ceac45 DH |
2394 | out_err_nosb: |
2395 | nfs_free_server(server); | |
0655960f | 2396 | goto out; |
54ceac45 | 2397 | |
f9c3a380 EP |
2398 | error_splat_root: |
2399 | dput(mntroot); | |
01194981 | 2400 | mntroot = ERR_PTR(error); |
54ceac45 | 2401 | error_splat_super: |
cfbc0683 N |
2402 | if (server && !s->s_root) |
2403 | bdi_unregister(&server->backing_dev_info); | |
2404 | error_splat_bdi: | |
6f5bbff9 | 2405 | deactivate_locked_super(s); |
0655960f | 2406 | goto out; |
f7b422b1 DH |
2407 | } |
2408 | ||
387c149b TM |
2409 | /* |
2410 | * Ensure that we unregister the bdi before kill_anon_super | |
2411 | * releases the device name | |
2412 | */ | |
2413 | static void nfs_put_super(struct super_block *s) | |
2414 | { | |
2415 | struct nfs_server *server = NFS_SB(s); | |
2416 | ||
2417 | bdi_unregister(&server->backing_dev_info); | |
2418 | } | |
2419 | ||
54ceac45 DH |
2420 | /* |
2421 | * Destroy an NFS2/3 superblock | |
2422 | */ | |
f7b422b1 DH |
2423 | static void nfs_kill_super(struct super_block *s) |
2424 | { | |
2425 | struct nfs_server *server = NFS_SB(s); | |
2426 | ||
2427 | kill_anon_super(s); | |
08734048 | 2428 | nfs_fscache_release_super_cookie(s); |
54ceac45 | 2429 | nfs_free_server(server); |
f7b422b1 DH |
2430 | } |
2431 | ||
54ceac45 DH |
2432 | /* |
2433 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2434 | */ | |
31f43471 AV |
2435 | static struct dentry * |
2436 | nfs_xdev_mount(struct file_system_type *fs_type, int flags, | |
2437 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
2438 | { |
2439 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2440 | struct super_block *s; |
2441 | struct nfs_server *server; | |
2442 | struct dentry *mntroot; | |
75180df2 | 2443 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2444 | struct nfs_sb_mountdata sb_mntdata = { |
2445 | .mntflags = flags, | |
2446 | }; | |
54ceac45 | 2447 | int error; |
f7b422b1 | 2448 | |
31f43471 | 2449 | dprintk("--> nfs_xdev_mount()\n"); |
f7b422b1 | 2450 | |
54ceac45 | 2451 | /* create a new volume representation */ |
7e6eb683 | 2452 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); |
54ceac45 DH |
2453 | if (IS_ERR(server)) { |
2454 | error = PTR_ERR(server); | |
2455 | goto out_err_noserver; | |
2456 | } | |
e89a5a43 | 2457 | sb_mntdata.server = server; |
8fa5c000 | 2458 | |
75180df2 TM |
2459 | if (server->flags & NFS_MOUNT_UNSHARED) |
2460 | compare_super = NULL; | |
2461 | ||
fb2088cc SP |
2462 | /* -o noac implies -o sync */ |
2463 | if (server->flags & NFS_MOUNT_NOAC) | |
2464 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2465 | ||
54ceac45 | 2466 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2467 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2468 | if (IS_ERR(s)) { |
2469 | error = PTR_ERR(s); | |
2470 | goto out_err_nosb; | |
2471 | } | |
5006a76c | 2472 | |
54ceac45 DH |
2473 | if (s->s_fs_info != server) { |
2474 | nfs_free_server(server); | |
2475 | server = NULL; | |
fa799759 MS |
2476 | } else { |
2477 | error = nfs_bdi_register(server); | |
2478 | if (error) | |
cfbc0683 | 2479 | goto error_splat_bdi; |
f7b422b1 | 2480 | } |
24c8dbbb | 2481 | |
54ceac45 DH |
2482 | if (!s->s_root) { |
2483 | /* initial superblock/root creation */ | |
54ceac45 | 2484 | nfs_clone_super(s, data->sb); |
2311b943 | 2485 | nfs_get_cache_cookie(s, NULL, data); |
54ceac45 | 2486 | } |
f7b422b1 | 2487 | |
0d5839ad | 2488 | mntroot = nfs_get_root(s, data->fh, dev_name); |
54ceac45 DH |
2489 | if (IS_ERR(mntroot)) { |
2490 | error = PTR_ERR(mntroot); | |
2491 | goto error_splat_super; | |
f7b422b1 | 2492 | } |
e9cc6c23 | 2493 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
4c1fe2f7 NB |
2494 | dput(mntroot); |
2495 | error = -ESTALE; | |
2496 | goto error_splat_super; | |
2497 | } | |
f7b422b1 | 2498 | |
54ceac45 | 2499 | s->s_flags |= MS_ACTIVE; |
f7b422b1 | 2500 | |
f9c3a380 EP |
2501 | /* clone any lsm security options from the parent to the new sb */ |
2502 | security_sb_clone_mnt_opts(data->sb, s); | |
2503 | ||
31f43471 AV |
2504 | dprintk("<-- nfs_xdev_mount() = 0\n"); |
2505 | return mntroot; | |
24c8dbbb | 2506 | |
54ceac45 DH |
2507 | out_err_nosb: |
2508 | nfs_free_server(server); | |
2509 | out_err_noserver: | |
31f43471 AV |
2510 | dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); |
2511 | return ERR_PTR(error); | |
f7b422b1 | 2512 | |
54ceac45 | 2513 | error_splat_super: |
cfbc0683 N |
2514 | if (server && !s->s_root) |
2515 | bdi_unregister(&server->backing_dev_info); | |
2516 | error_splat_bdi: | |
6f5bbff9 | 2517 | deactivate_locked_super(s); |
31f43471 AV |
2518 | dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); |
2519 | return ERR_PTR(error); | |
f7b422b1 DH |
2520 | } |
2521 | ||
54ceac45 DH |
2522 | #ifdef CONFIG_NFS_V4 |
2523 | ||
f7b422b1 | 2524 | /* |
54ceac45 | 2525 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2526 | */ |
54ceac45 DH |
2527 | static void nfs4_clone_super(struct super_block *sb, |
2528 | const struct super_block *old_sb) | |
f7b422b1 | 2529 | { |
54ceac45 DH |
2530 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2531 | sb->s_blocksize = old_sb->s_blocksize; | |
2532 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2533 | sb->s_time_gran = 1; |
54ceac45 | 2534 | sb->s_op = old_sb->s_op; |
a8a5da99 AK |
2535 | /* |
2536 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2537 | * so ourselves when necessary. | |
2538 | */ | |
2539 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b AK |
2540 | sb->s_xattr = old_sb->s_xattr; |
2541 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2542 | } |
2543 | ||
54ceac45 DH |
2544 | /* |
2545 | * Set up an NFS4 superblock | |
2546 | */ | |
2547 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 2548 | { |
54ceac45 DH |
2549 | sb->s_time_gran = 1; |
2550 | sb->s_op = &nfs4_sops; | |
a8a5da99 AK |
2551 | /* |
2552 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2553 | * so ourselves when necessary. | |
2554 | */ | |
2555 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b | 2556 | sb->s_xattr = nfs4_xattr_handlers; |
54ceac45 | 2557 | nfs_initialise_sb(sb); |
f7b422b1 DH |
2558 | } |
2559 | ||
01c3f052 TM |
2560 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
2561 | { | |
5eebde23 SJ |
2562 | args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
2563 | NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); | |
01c3f052 TM |
2564 | } |
2565 | ||
7630c852 CL |
2566 | static int nfs4_validate_text_mount_data(void *options, |
2567 | struct nfs_parsed_mount_data *args, | |
2568 | const char *dev_name) | |
2569 | { | |
2570 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; | |
2571 | ||
f5855fec | 2572 | nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); |
7630c852 CL |
2573 | |
2574 | nfs_validate_transport_protocol(args); | |
2575 | ||
2576 | nfs4_validate_mount_flags(args); | |
2577 | ||
2ecda72b TM |
2578 | if (args->version != 4) { |
2579 | dfprintk(MOUNT, | |
2580 | "NFS4: Illegal mount version\n"); | |
2581 | return -EINVAL; | |
2582 | } | |
2583 | ||
7630c852 CL |
2584 | if (args->auth_flavor_len > 1) { |
2585 | dfprintk(MOUNT, | |
2586 | "NFS4: Too many RPC auth flavours specified\n"); | |
2587 | return -EINVAL; | |
2588 | } | |
2589 | ||
7630c852 CL |
2590 | return nfs_parse_devname(dev_name, |
2591 | &args->nfs_server.hostname, | |
2592 | NFS4_MAXNAMLEN, | |
2593 | &args->nfs_server.export_path, | |
2594 | NFS4_MAXPATHLEN); | |
2595 | } | |
2596 | ||
f0768ebd CL |
2597 | /* |
2598 | * Validate NFSv4 mount options | |
2599 | */ | |
91ea40b9 TT |
2600 | static int nfs4_validate_mount_data(void *options, |
2601 | struct nfs_parsed_mount_data *args, | |
2602 | const char *dev_name) | |
f0768ebd | 2603 | { |
4cfd74fc | 2604 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
91ea40b9 | 2605 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2606 | char *c; |
2607 | ||
2608 | if (data == NULL) | |
2609 | goto out_no_data; | |
2610 | ||
2611 | switch (data->version) { | |
2612 | case 1: | |
4c568017 CL |
2613 | if (data->host_addrlen > sizeof(args->nfs_server.address)) |
2614 | goto out_no_address; | |
2615 | if (data->host_addrlen == 0) | |
f0768ebd | 2616 | goto out_no_address; |
4c568017 | 2617 | args->nfs_server.addrlen = data->host_addrlen; |
4cfd74fc | 2618 | if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
f0768ebd | 2619 | return -EFAULT; |
4cfd74fc | 2620 | if (!nfs_verify_server_address(sap)) |
f0768ebd CL |
2621 | goto out_no_address; |
2622 | ||
6738b251 CL |
2623 | if (data->auth_flavourlen) { |
2624 | if (data->auth_flavourlen > 1) | |
2625 | goto out_inval_auth; | |
20c71f5e | 2626 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2627 | data->auth_flavours, |
20c71f5e | 2628 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2629 | return -EFAULT; |
f0768ebd CL |
2630 | } |
2631 | ||
2632 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2633 | if (IS_ERR(c)) | |
2634 | return PTR_ERR(c); | |
91ea40b9 | 2635 | args->nfs_server.hostname = c; |
f0768ebd CL |
2636 | |
2637 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2638 | if (IS_ERR(c)) | |
2639 | return PTR_ERR(c); | |
91ea40b9 TT |
2640 | args->nfs_server.export_path = c; |
2641 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2642 | |
2643 | c = strndup_user(data->client_addr.data, 16); | |
2644 | if (IS_ERR(c)) | |
2645 | return PTR_ERR(c); | |
91ea40b9 TT |
2646 | args->client_address = c; |
2647 | ||
2648 | /* | |
2649 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2650 | * can deal with. | |
2651 | */ | |
2652 | ||
2653 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2654 | args->rsize = data->rsize; | |
2655 | args->wsize = data->wsize; | |
2656 | args->timeo = data->timeo; | |
2657 | args->retrans = data->retrans; | |
2658 | args->acregmin = data->acregmin; | |
2659 | args->acregmax = data->acregmax; | |
2660 | args->acdirmin = data->acdirmin; | |
2661 | args->acdirmax = data->acdirmax; | |
2662 | args->nfs_server.protocol = data->proto; | |
259875ef | 2663 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2664 | |
2665 | break; | |
7630c852 | 2666 | default: |
91ea40b9 | 2667 | if (nfs_parse_mount_options((char *)options, args) == 0) |
80071225 CL |
2668 | return -EINVAL; |
2669 | ||
4cfd74fc | 2670 | if (!nfs_verify_server_address(sap)) |
80071225 | 2671 | return -EINVAL; |
dc045898 | 2672 | |
7630c852 | 2673 | return nfs4_validate_text_mount_data(options, args, dev_name); |
f0768ebd CL |
2674 | } |
2675 | ||
2676 | return 0; | |
2677 | ||
2678 | out_no_data: | |
2679 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2680 | return -EINVAL; | |
2681 | ||
2682 | out_inval_auth: | |
2683 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2684 | data->auth_flavourlen); | |
2685 | return -EINVAL; | |
2686 | ||
2687 | out_no_address: | |
2688 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2689 | return -EINVAL; | |
f0768ebd CL |
2690 | } |
2691 | ||
54ceac45 | 2692 | /* |
c02d7adf | 2693 | * Get the superblock for the NFS4 root partition |
54ceac45 | 2694 | */ |
31f43471 AV |
2695 | static struct dentry * |
2696 | nfs4_remote_mount(struct file_system_type *fs_type, int flags, | |
2697 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2698 | { |
c02d7adf | 2699 | struct nfs_parsed_mount_data *data = raw_data; |
54ceac45 DH |
2700 | struct super_block *s; |
2701 | struct nfs_server *server; | |
33852a1f | 2702 | struct nfs_fh *mntfh; |
54ceac45 | 2703 | struct dentry *mntroot; |
75180df2 | 2704 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2705 | struct nfs_sb_mountdata sb_mntdata = { |
2706 | .mntflags = flags, | |
2707 | }; | |
33852a1f TM |
2708 | int error = -ENOMEM; |
2709 | ||
b157b06c | 2710 | mntfh = nfs_alloc_fhandle(); |
33852a1f | 2711 | if (data == NULL || mntfh == NULL) |
8a0d551a | 2712 | goto out; |
f9c3a380 | 2713 | |
54ceac45 | 2714 | /* Get a volume representation */ |
33852a1f | 2715 | server = nfs4_create_server(data, mntfh); |
54ceac45 DH |
2716 | if (IS_ERR(server)) { |
2717 | error = PTR_ERR(server); | |
29eb981a | 2718 | goto out; |
f7b422b1 | 2719 | } |
e89a5a43 | 2720 | sb_mntdata.server = server; |
f7b422b1 | 2721 | |
75180df2 TM |
2722 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2723 | compare_super = NULL; | |
2724 | ||
fb2088cc SP |
2725 | /* -o noac implies -o sync */ |
2726 | if (server->flags & NFS_MOUNT_NOAC) | |
2727 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2728 | ||
54ceac45 | 2729 | /* Get a superblock - note that we may end up sharing one that already exists */ |
c02d7adf | 2730 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
2731 | if (IS_ERR(s)) { |
2732 | error = PTR_ERR(s); | |
f7b422b1 | 2733 | goto out_free; |
816724e6 TM |
2734 | } |
2735 | ||
5dd3177a TM |
2736 | if (s->s_fs_info != server) { |
2737 | nfs_free_server(server); | |
2738 | server = NULL; | |
fa799759 MS |
2739 | } else { |
2740 | error = nfs_bdi_register(server); | |
2741 | if (error) | |
cfbc0683 | 2742 | goto error_splat_bdi; |
5dd3177a TM |
2743 | } |
2744 | ||
54ceac45 DH |
2745 | if (!s->s_root) { |
2746 | /* initial superblock/root creation */ | |
54ceac45 | 2747 | nfs4_fill_super(s); |
2311b943 | 2748 | nfs_get_cache_cookie(s, data, NULL); |
54ceac45 | 2749 | } |
f7b422b1 | 2750 | |
bae36241 | 2751 | mntroot = nfs_get_root(s, mntfh, dev_name); |
54ceac45 DH |
2752 | if (IS_ERR(mntroot)) { |
2753 | error = PTR_ERR(mntroot); | |
2754 | goto error_splat_super; | |
f7b422b1 | 2755 | } |
54ceac45 | 2756 | |
33852a1f | 2757 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
46c8ac74 EP |
2758 | if (error) |
2759 | goto error_splat_root; | |
2760 | ||
f7b422b1 | 2761 | s->s_flags |= MS_ACTIVE; |
31f43471 | 2762 | |
31f43471 AV |
2763 | nfs_free_fhandle(mntfh); |
2764 | return mntroot; | |
29eb981a CL |
2765 | |
2766 | out: | |
b157b06c | 2767 | nfs_free_fhandle(mntfh); |
31f43471 | 2768 | return ERR_PTR(error); |
54ceac45 | 2769 | |
f7b422b1 | 2770 | out_free: |
54ceac45 | 2771 | nfs_free_server(server); |
29eb981a | 2772 | goto out; |
54ceac45 | 2773 | |
46c8ac74 EP |
2774 | error_splat_root: |
2775 | dput(mntroot); | |
54ceac45 | 2776 | error_splat_super: |
cfbc0683 N |
2777 | if (server && !s->s_root) |
2778 | bdi_unregister(&server->backing_dev_info); | |
2779 | error_splat_bdi: | |
6f5bbff9 | 2780 | deactivate_locked_super(s); |
29eb981a | 2781 | goto out; |
f7b422b1 DH |
2782 | } |
2783 | ||
c02d7adf TM |
2784 | static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
2785 | int flags, void *data, const char *hostname) | |
2786 | { | |
2787 | struct vfsmount *root_mnt; | |
2788 | char *root_devname; | |
2789 | size_t len; | |
2790 | ||
98a2139f | 2791 | len = strlen(hostname) + 5; |
c02d7adf TM |
2792 | root_devname = kmalloc(len, GFP_KERNEL); |
2793 | if (root_devname == NULL) | |
2794 | return ERR_PTR(-ENOMEM); | |
98a2139f JK |
2795 | /* Does hostname needs to be enclosed in brackets? */ |
2796 | if (strchr(hostname, ':')) | |
2797 | snprintf(root_devname, len, "[%s]:/", hostname); | |
2798 | else | |
2799 | snprintf(root_devname, len, "%s:/", hostname); | |
c02d7adf TM |
2800 | root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); |
2801 | kfree(root_devname); | |
2802 | return root_mnt; | |
2803 | } | |
2804 | ||
ce587e07 TM |
2805 | struct nfs_referral_count { |
2806 | struct list_head list; | |
2807 | const struct task_struct *task; | |
2808 | unsigned int referral_count; | |
2809 | }; | |
2810 | ||
2811 | static LIST_HEAD(nfs_referral_count_list); | |
2812 | static DEFINE_SPINLOCK(nfs_referral_count_list_lock); | |
2813 | ||
2814 | static struct nfs_referral_count *nfs_find_referral_count(void) | |
2815 | { | |
2816 | struct nfs_referral_count *p; | |
2817 | ||
2818 | list_for_each_entry(p, &nfs_referral_count_list, list) { | |
2819 | if (p->task == current) | |
2820 | return p; | |
2821 | } | |
2822 | return NULL; | |
2823 | } | |
2824 | ||
2825 | #define NFS_MAX_NESTED_REFERRALS 2 | |
2826 | ||
2827 | static int nfs_referral_loop_protect(void) | |
2828 | { | |
2829 | struct nfs_referral_count *p, *new; | |
2830 | int ret = -ENOMEM; | |
2831 | ||
2832 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2833 | if (!new) | |
2834 | goto out; | |
2835 | new->task = current; | |
2836 | new->referral_count = 1; | |
2837 | ||
2838 | ret = 0; | |
2839 | spin_lock(&nfs_referral_count_list_lock); | |
2840 | p = nfs_find_referral_count(); | |
2841 | if (p != NULL) { | |
2842 | if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) | |
2843 | ret = -ELOOP; | |
2844 | else | |
2845 | p->referral_count++; | |
2846 | } else { | |
2847 | list_add(&new->list, &nfs_referral_count_list); | |
2848 | new = NULL; | |
2849 | } | |
2850 | spin_unlock(&nfs_referral_count_list_lock); | |
2851 | kfree(new); | |
2852 | out: | |
2853 | return ret; | |
2854 | } | |
2855 | ||
2856 | static void nfs_referral_loop_unprotect(void) | |
2857 | { | |
2858 | struct nfs_referral_count *p; | |
2859 | ||
2860 | spin_lock(&nfs_referral_count_list_lock); | |
2861 | p = nfs_find_referral_count(); | |
2862 | p->referral_count--; | |
2863 | if (p->referral_count == 0) | |
2864 | list_del(&p->list); | |
2865 | else | |
2866 | p = NULL; | |
2867 | spin_unlock(&nfs_referral_count_list_lock); | |
2868 | kfree(p); | |
2869 | } | |
2870 | ||
01194981 AV |
2871 | static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, |
2872 | const char *export_path) | |
c02d7adf | 2873 | { |
01194981 | 2874 | struct dentry *dentry; |
5352d3b6 | 2875 | int err; |
c02d7adf | 2876 | |
5352d3b6 AV |
2877 | if (IS_ERR(root_mnt)) |
2878 | return ERR_CAST(root_mnt); | |
2879 | ||
2880 | err = nfs_referral_loop_protect(); | |
2881 | if (err) { | |
ea441d11 | 2882 | mntput(root_mnt); |
5352d3b6 | 2883 | return ERR_PTR(err); |
ea441d11 | 2884 | } |
c02d7adf | 2885 | |
ea441d11 AV |
2886 | dentry = mount_subtree(root_mnt, export_path); |
2887 | nfs_referral_loop_unprotect(); | |
c02d7adf | 2888 | |
01194981 | 2889 | return dentry; |
c02d7adf TM |
2890 | } |
2891 | ||
01194981 AV |
2892 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
2893 | struct nfs_parsed_mount_data *data) | |
a6fe23be CL |
2894 | { |
2895 | char *export_path; | |
2896 | struct vfsmount *root_mnt; | |
01194981 | 2897 | struct dentry *res; |
a6fe23be CL |
2898 | |
2899 | dfprintk(MOUNT, "--> nfs4_try_mount()\n"); | |
2900 | ||
2901 | export_path = data->nfs_server.export_path; | |
2902 | data->nfs_server.export_path = "/"; | |
2903 | root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, | |
2904 | data->nfs_server.hostname); | |
2905 | data->nfs_server.export_path = export_path; | |
2906 | ||
5352d3b6 | 2907 | res = nfs_follow_remote_path(root_mnt, export_path); |
a6fe23be | 2908 | |
01194981 AV |
2909 | dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", |
2910 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
2911 | IS_ERR(res) ? " [error]" : ""); | |
2912 | return res; | |
a6fe23be CL |
2913 | } |
2914 | ||
c02d7adf TM |
2915 | /* |
2916 | * Get the superblock for an NFS4 mountpoint | |
2917 | */ | |
01194981 AV |
2918 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, |
2919 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
2920 | { |
2921 | struct nfs_parsed_mount_data *data; | |
c02d7adf | 2922 | int error = -ENOMEM; |
01194981 | 2923 | struct dentry *res = ERR_PTR(-ENOMEM); |
c02d7adf | 2924 | |
c5811dbd | 2925 | data = nfs_alloc_parsed_mount_data(4); |
c02d7adf | 2926 | if (data == NULL) |
8a0d551a | 2927 | goto out; |
c02d7adf TM |
2928 | |
2929 | /* Validate the mount data */ | |
2930 | error = nfs4_validate_mount_data(raw_data, data, dev_name); | |
01194981 AV |
2931 | if (error < 0) { |
2932 | res = ERR_PTR(error); | |
c02d7adf | 2933 | goto out; |
01194981 | 2934 | } |
c02d7adf | 2935 | |
01194981 AV |
2936 | res = nfs4_try_mount(flags, dev_name, data); |
2937 | if (IS_ERR(res)) | |
2938 | error = PTR_ERR(res); | |
c02d7adf TM |
2939 | |
2940 | out: | |
8a0d551a | 2941 | nfs_free_parsed_mount_data(data); |
01194981 | 2942 | dprintk("<-- nfs4_mount() = %d%s\n", error, |
c02d7adf | 2943 | error != 0 ? " [error]" : ""); |
01194981 | 2944 | return res; |
c02d7adf TM |
2945 | } |
2946 | ||
f7b422b1 DH |
2947 | static void nfs4_kill_super(struct super_block *sb) |
2948 | { | |
2949 | struct nfs_server *server = NFS_SB(sb); | |
2950 | ||
0f3e66c6 | 2951 | dprintk("--> %s\n", __func__); |
515d8611 | 2952 | nfs_super_return_all_delegations(sb); |
f7b422b1 | 2953 | kill_anon_super(sb); |
08734048 | 2954 | nfs_fscache_release_super_cookie(sb); |
54ceac45 | 2955 | nfs_free_server(server); |
0f3e66c6 | 2956 | dprintk("<-- %s\n", __func__); |
f7b422b1 DH |
2957 | } |
2958 | ||
2959 | /* | |
54ceac45 | 2960 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2961 | */ |
31f43471 AV |
2962 | static struct dentry * |
2963 | nfs4_xdev_mount(struct file_system_type *fs_type, int flags, | |
2964 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2965 | { |
54ceac45 DH |
2966 | struct nfs_clone_mount *data = raw_data; |
2967 | struct super_block *s; | |
2968 | struct nfs_server *server; | |
2969 | struct dentry *mntroot; | |
75180df2 | 2970 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2971 | struct nfs_sb_mountdata sb_mntdata = { |
2972 | .mntflags = flags, | |
2973 | }; | |
54ceac45 | 2974 | int error; |
f7b422b1 | 2975 | |
31f43471 | 2976 | dprintk("--> nfs4_xdev_mount()\n"); |
f7b422b1 | 2977 | |
54ceac45 | 2978 | /* create a new volume representation */ |
7e6eb683 | 2979 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); |
54ceac45 DH |
2980 | if (IS_ERR(server)) { |
2981 | error = PTR_ERR(server); | |
2982 | goto out_err_noserver; | |
f7b422b1 | 2983 | } |
e89a5a43 | 2984 | sb_mntdata.server = server; |
f7b422b1 | 2985 | |
75180df2 TM |
2986 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2987 | compare_super = NULL; | |
2988 | ||
fb2088cc SP |
2989 | /* -o noac implies -o sync */ |
2990 | if (server->flags & NFS_MOUNT_NOAC) | |
2991 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2992 | ||
54ceac45 | 2993 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 2994 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2995 | if (IS_ERR(s)) { |
2996 | error = PTR_ERR(s); | |
2997 | goto out_err_nosb; | |
f7b422b1 | 2998 | } |
f7b422b1 | 2999 | |
54ceac45 DH |
3000 | if (s->s_fs_info != server) { |
3001 | nfs_free_server(server); | |
3002 | server = NULL; | |
fa799759 MS |
3003 | } else { |
3004 | error = nfs_bdi_register(server); | |
3005 | if (error) | |
cfbc0683 | 3006 | goto error_splat_bdi; |
54ceac45 | 3007 | } |
f7b422b1 | 3008 | |
54ceac45 DH |
3009 | if (!s->s_root) { |
3010 | /* initial superblock/root creation */ | |
54ceac45 | 3011 | nfs4_clone_super(s, data->sb); |
2311b943 | 3012 | nfs_get_cache_cookie(s, NULL, data); |
54ceac45 | 3013 | } |
f7b422b1 | 3014 | |
bae36241 | 3015 | mntroot = nfs_get_root(s, data->fh, dev_name); |
54ceac45 DH |
3016 | if (IS_ERR(mntroot)) { |
3017 | error = PTR_ERR(mntroot); | |
3018 | goto error_splat_super; | |
3019 | } | |
e9cc6c23 TM |
3020 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
3021 | dput(mntroot); | |
3022 | error = -ESTALE; | |
3023 | goto error_splat_super; | |
3024 | } | |
f7b422b1 | 3025 | |
54ceac45 | 3026 | s->s_flags |= MS_ACTIVE; |
54ceac45 | 3027 | |
46c8ac74 EP |
3028 | security_sb_clone_mnt_opts(data->sb, s); |
3029 | ||
31f43471 AV |
3030 | dprintk("<-- nfs4_xdev_mount() = 0\n"); |
3031 | return mntroot; | |
54ceac45 DH |
3032 | |
3033 | out_err_nosb: | |
3034 | nfs_free_server(server); | |
3035 | out_err_noserver: | |
31f43471 AV |
3036 | dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); |
3037 | return ERR_PTR(error); | |
54ceac45 DH |
3038 | |
3039 | error_splat_super: | |
cfbc0683 N |
3040 | if (server && !s->s_root) |
3041 | bdi_unregister(&server->backing_dev_info); | |
3042 | error_splat_bdi: | |
6f5bbff9 | 3043 | deactivate_locked_super(s); |
31f43471 AV |
3044 | dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); |
3045 | return ERR_PTR(error); | |
f7b422b1 DH |
3046 | } |
3047 | ||
31f43471 AV |
3048 | static struct dentry * |
3049 | nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, | |
3050 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
3051 | { |
3052 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
3053 | struct super_block *s; |
3054 | struct nfs_server *server; | |
3055 | struct dentry *mntroot; | |
4f727296 | 3056 | struct nfs_fh *mntfh; |
75180df2 | 3057 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
3058 | struct nfs_sb_mountdata sb_mntdata = { |
3059 | .mntflags = flags, | |
3060 | }; | |
4f727296 | 3061 | int error = -ENOMEM; |
54ceac45 DH |
3062 | |
3063 | dprintk("--> nfs4_referral_get_sb()\n"); | |
3064 | ||
4f727296 TM |
3065 | mntfh = nfs_alloc_fhandle(); |
3066 | if (mntfh == NULL) | |
3067 | goto out_err_nofh; | |
3068 | ||
54ceac45 | 3069 | /* create a new volume representation */ |
4f727296 | 3070 | server = nfs4_create_referral_server(data, mntfh); |
54ceac45 DH |
3071 | if (IS_ERR(server)) { |
3072 | error = PTR_ERR(server); | |
3073 | goto out_err_noserver; | |
3074 | } | |
e89a5a43 | 3075 | sb_mntdata.server = server; |
54ceac45 | 3076 | |
75180df2 TM |
3077 | if (server->flags & NFS4_MOUNT_UNSHARED) |
3078 | compare_super = NULL; | |
3079 | ||
fb2088cc SP |
3080 | /* -o noac implies -o sync */ |
3081 | if (server->flags & NFS_MOUNT_NOAC) | |
3082 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
3083 | ||
54ceac45 | 3084 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 3085 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
3086 | if (IS_ERR(s)) { |
3087 | error = PTR_ERR(s); | |
3088 | goto out_err_nosb; | |
3089 | } | |
3090 | ||
3091 | if (s->s_fs_info != server) { | |
3092 | nfs_free_server(server); | |
3093 | server = NULL; | |
fa799759 MS |
3094 | } else { |
3095 | error = nfs_bdi_register(server); | |
3096 | if (error) | |
cfbc0683 | 3097 | goto error_splat_bdi; |
54ceac45 DH |
3098 | } |
3099 | ||
3100 | if (!s->s_root) { | |
3101 | /* initial superblock/root creation */ | |
54ceac45 | 3102 | nfs4_fill_super(s); |
2311b943 | 3103 | nfs_get_cache_cookie(s, NULL, data); |
54ceac45 DH |
3104 | } |
3105 | ||
bae36241 | 3106 | mntroot = nfs_get_root(s, mntfh, dev_name); |
54ceac45 DH |
3107 | if (IS_ERR(mntroot)) { |
3108 | error = PTR_ERR(mntroot); | |
3109 | goto error_splat_super; | |
3110 | } | |
e9cc6c23 TM |
3111 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
3112 | dput(mntroot); | |
3113 | error = -ESTALE; | |
3114 | goto error_splat_super; | |
3115 | } | |
54ceac45 DH |
3116 | |
3117 | s->s_flags |= MS_ACTIVE; | |
54ceac45 | 3118 | |
46c8ac74 EP |
3119 | security_sb_clone_mnt_opts(data->sb, s); |
3120 | ||
4f727296 | 3121 | nfs_free_fhandle(mntfh); |
54ceac45 | 3122 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); |
31f43471 | 3123 | return mntroot; |
54ceac45 DH |
3124 | |
3125 | out_err_nosb: | |
3126 | nfs_free_server(server); | |
3127 | out_err_noserver: | |
4f727296 TM |
3128 | nfs_free_fhandle(mntfh); |
3129 | out_err_nofh: | |
54ceac45 | 3130 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); |
31f43471 | 3131 | return ERR_PTR(error); |
54ceac45 DH |
3132 | |
3133 | error_splat_super: | |
cfbc0683 N |
3134 | if (server && !s->s_root) |
3135 | bdi_unregister(&server->backing_dev_info); | |
3136 | error_splat_bdi: | |
6f5bbff9 | 3137 | deactivate_locked_super(s); |
4f727296 | 3138 | nfs_free_fhandle(mntfh); |
54ceac45 | 3139 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); |
31f43471 | 3140 | return ERR_PTR(error); |
f7b422b1 DH |
3141 | } |
3142 | ||
c02d7adf TM |
3143 | /* |
3144 | * Create an NFS4 server record on referral traversal | |
3145 | */ | |
01194981 AV |
3146 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
3147 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
3148 | { |
3149 | struct nfs_clone_mount *data = raw_data; | |
3150 | char *export_path; | |
3151 | struct vfsmount *root_mnt; | |
01194981 | 3152 | struct dentry *res; |
c02d7adf | 3153 | |
01194981 | 3154 | dprintk("--> nfs4_referral_mount()\n"); |
c02d7adf TM |
3155 | |
3156 | export_path = data->mnt_path; | |
3157 | data->mnt_path = "/"; | |
3158 | ||
3159 | root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, | |
3160 | flags, data, data->hostname); | |
3161 | data->mnt_path = export_path; | |
3162 | ||
5352d3b6 | 3163 | res = nfs_follow_remote_path(root_mnt, export_path); |
01194981 AV |
3164 | dprintk("<-- nfs4_referral_mount() = %ld%s\n", |
3165 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
3166 | IS_ERR(res) ? " [error]" : ""); | |
3167 | return res; | |
c02d7adf TM |
3168 | } |
3169 | ||
54ceac45 | 3170 | #endif /* CONFIG_NFS_V4 */ |