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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 TM |
44 | #include <linux/mnt_namespace.h> |
45 | #include <linux/namei.h> | |
f7b422b1 DH |
46 | #include <linux/nfs_idmap.h> |
47 | #include <linux/vfs.h> | |
48 | #include <linux/inet.h> | |
fd00a8ff | 49 | #include <linux/in6.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
fd00a8ff | 51 | #include <net/ipv6.h> |
d8e7748a | 52 | #include <linux/netdevice.h> |
f7b422b1 | 53 | #include <linux/nfs_xdr.h> |
b5d5dfbd | 54 | #include <linux/magic.h> |
bf0fd768 | 55 | #include <linux/parser.h> |
f7b422b1 DH |
56 | |
57 | #include <asm/system.h> | |
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" |
f7b422b1 DH |
66 | |
67 | #define NFSDBG_FACILITY NFSDBG_VFS | |
68 | ||
1e657bd5 PZ |
69 | #ifdef CONFIG_NFS_V3 |
70 | #define NFS_DEFAULT_VERSION 3 | |
71 | #else | |
72 | #define NFS_DEFAULT_VERSION 2 | |
73 | #endif | |
74 | ||
bf0fd768 CL |
75 | enum { |
76 | /* Mount options that take no arguments */ | |
77 | Opt_soft, Opt_hard, | |
bf0fd768 CL |
78 | Opt_posix, Opt_noposix, |
79 | Opt_cto, Opt_nocto, | |
80 | Opt_ac, Opt_noac, | |
81 | Opt_lock, Opt_nolock, | |
764302cc | 82 | Opt_v2, Opt_v3, Opt_v4, |
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, |
ad879cef | 100 | Opt_nfsvers, |
3fd5be9e | 101 | Opt_minorversion, |
bf0fd768 CL |
102 | |
103 | /* Mount options that take string arguments */ | |
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" }, | |
135 | { Opt_v2, "v2" }, | |
136 | { Opt_v3, "v3" }, | |
764302cc | 137 | { Opt_v4, "v4" }, |
bf0fd768 CL |
138 | { Opt_udp, "udp" }, |
139 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 140 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
141 | { Opt_acl, "acl" }, |
142 | { Opt_noacl, "noacl" }, | |
143 | { Opt_rdirplus, "rdirplus" }, | |
144 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
145 | { Opt_sharecache, "sharecache" }, |
146 | { Opt_nosharecache, "nosharecache" }, | |
d740351b CL |
147 | { Opt_resvport, "resvport" }, |
148 | { Opt_noresvport, "noresvport" }, | |
b797cac7 | 149 | { Opt_fscache, "fsc" }, |
b797cac7 | 150 | { Opt_nofscache, "nofsc" }, |
bf0fd768 | 151 | |
a5a16bae CL |
152 | { Opt_port, "port=%s" }, |
153 | { Opt_rsize, "rsize=%s" }, | |
154 | { Opt_wsize, "wsize=%s" }, | |
155 | { Opt_bsize, "bsize=%s" }, | |
156 | { Opt_timeo, "timeo=%s" }, | |
157 | { Opt_retrans, "retrans=%s" }, | |
158 | { Opt_acregmin, "acregmin=%s" }, | |
159 | { Opt_acregmax, "acregmax=%s" }, | |
160 | { Opt_acdirmin, "acdirmin=%s" }, | |
161 | { Opt_acdirmax, "acdirmax=%s" }, | |
162 | { Opt_actimeo, "actimeo=%s" }, | |
163 | { Opt_namelen, "namlen=%s" }, | |
164 | { Opt_mountport, "mountport=%s" }, | |
165 | { Opt_mountvers, "mountvers=%s" }, | |
166 | { Opt_nfsvers, "nfsvers=%s" }, | |
167 | { Opt_nfsvers, "vers=%s" }, | |
f3f4f4ed | 168 | { Opt_minorversion, "minorversion=%s" }, |
bf0fd768 CL |
169 | |
170 | { Opt_sec, "sec=%s" }, | |
171 | { Opt_proto, "proto=%s" }, | |
172 | { Opt_mountproto, "mountproto=%s" }, | |
173 | { Opt_addr, "addr=%s" }, | |
174 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 175 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 176 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 | 177 | |
7973c1f1 | 178 | { Opt_lookupcache, "lookupcache=%s" }, |
a6d5ff64 | 179 | { Opt_fscache_uniq, "fsc=%s" }, |
5eebde23 | 180 | { Opt_local_lock, "local_lock=%s" }, |
7973c1f1 | 181 | |
bf0fd768 CL |
182 | { Opt_err, NULL } |
183 | }; | |
184 | ||
185 | enum { | |
ee671b01 | 186 | Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, |
bf0fd768 CL |
187 | |
188 | Opt_xprt_err | |
189 | }; | |
190 | ||
a447c093 | 191 | static const match_table_t nfs_xprt_protocol_tokens = { |
bf0fd768 | 192 | { Opt_xprt_udp, "udp" }, |
ee671b01 | 193 | { Opt_xprt_udp6, "udp6" }, |
bf0fd768 | 194 | { Opt_xprt_tcp, "tcp" }, |
ee671b01 | 195 | { Opt_xprt_tcp6, "tcp6" }, |
2cf7ff7a | 196 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
197 | |
198 | { Opt_xprt_err, NULL } | |
199 | }; | |
200 | ||
201 | enum { | |
202 | Opt_sec_none, Opt_sec_sys, | |
203 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
204 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
205 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
206 | ||
207 | Opt_sec_err | |
208 | }; | |
209 | ||
a447c093 | 210 | static const match_table_t nfs_secflavor_tokens = { |
bf0fd768 CL |
211 | { Opt_sec_none, "none" }, |
212 | { Opt_sec_none, "null" }, | |
213 | { Opt_sec_sys, "sys" }, | |
214 | ||
215 | { Opt_sec_krb5, "krb5" }, | |
216 | { Opt_sec_krb5i, "krb5i" }, | |
217 | { Opt_sec_krb5p, "krb5p" }, | |
218 | ||
219 | { Opt_sec_lkey, "lkey" }, | |
220 | { Opt_sec_lkeyi, "lkeyi" }, | |
221 | { Opt_sec_lkeyp, "lkeyp" }, | |
222 | ||
8d042218 OK |
223 | { Opt_sec_spkm, "spkm3" }, |
224 | { Opt_sec_spkmi, "spkm3i" }, | |
225 | { Opt_sec_spkmp, "spkm3p" }, | |
226 | ||
bf0fd768 CL |
227 | { Opt_sec_err, NULL } |
228 | }; | |
229 | ||
7973c1f1 TM |
230 | enum { |
231 | Opt_lookupcache_all, Opt_lookupcache_positive, | |
232 | Opt_lookupcache_none, | |
233 | ||
234 | Opt_lookupcache_err | |
235 | }; | |
236 | ||
237 | static match_table_t nfs_lookupcache_tokens = { | |
238 | { Opt_lookupcache_all, "all" }, | |
239 | { Opt_lookupcache_positive, "pos" }, | |
240 | { Opt_lookupcache_positive, "positive" }, | |
241 | { Opt_lookupcache_none, "none" }, | |
242 | ||
243 | { Opt_lookupcache_err, NULL } | |
244 | }; | |
245 | ||
5eebde23 SJ |
246 | enum { |
247 | Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, | |
248 | Opt_local_lock_none, | |
249 | ||
250 | Opt_local_lock_err | |
251 | }; | |
252 | ||
253 | static match_table_t nfs_local_lock_tokens = { | |
254 | { Opt_local_lock_all, "all" }, | |
255 | { Opt_local_lock_flock, "flock" }, | |
256 | { Opt_local_lock_posix, "posix" }, | |
257 | { Opt_local_lock_none, "none" }, | |
258 | ||
259 | { Opt_local_lock_err, NULL } | |
260 | }; | |
261 | ||
bf0fd768 | 262 | |
42faad99 | 263 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 264 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 DH |
265 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
266 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
816724e6 | 267 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); |
31f43471 AV |
268 | static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, |
269 | int flags, const char *dev_name, void *raw_data); | |
387c149b | 270 | static void nfs_put_super(struct super_block *); |
f7b422b1 | 271 | static void nfs_kill_super(struct super_block *); |
48b605f8 | 272 | static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); |
f7b422b1 DH |
273 | |
274 | static struct file_system_type nfs_fs_type = { | |
275 | .owner = THIS_MODULE, | |
276 | .name = "nfs", | |
277 | .get_sb = nfs_get_sb, | |
278 | .kill_sb = nfs_kill_super, | |
349457cc | 279 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
280 | }; |
281 | ||
54ceac45 | 282 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
283 | .owner = THIS_MODULE, |
284 | .name = "nfs", | |
31f43471 | 285 | .mount = nfs_xdev_mount, |
f7b422b1 | 286 | .kill_sb = nfs_kill_super, |
349457cc | 287 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
288 | }; |
289 | ||
ee9b6d61 | 290 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
291 | .alloc_inode = nfs_alloc_inode, |
292 | .destroy_inode = nfs_destroy_inode, | |
293 | .write_inode = nfs_write_inode, | |
387c149b | 294 | .put_super = nfs_put_super, |
f7b422b1 | 295 | .statfs = nfs_statfs, |
b57922d9 | 296 | .evict_inode = nfs_evict_inode, |
f7b422b1 DH |
297 | .umount_begin = nfs_umount_begin, |
298 | .show_options = nfs_show_options, | |
299 | .show_stats = nfs_show_stats, | |
48b605f8 | 300 | .remount_fs = nfs_remount, |
f7b422b1 DH |
301 | }; |
302 | ||
303 | #ifdef CONFIG_NFS_V4 | |
7630c852 CL |
304 | static int nfs4_validate_text_mount_data(void *options, |
305 | struct nfs_parsed_mount_data *args, const char *dev_name); | |
a6fe23be CL |
306 | static int nfs4_try_mount(int flags, const char *dev_name, |
307 | struct nfs_parsed_mount_data *data, struct vfsmount *mnt); | |
816724e6 TM |
308 | static int nfs4_get_sb(struct file_system_type *fs_type, |
309 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
31f43471 AV |
310 | static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
311 | int flags, const char *dev_name, void *raw_data); | |
312 | static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, | |
313 | int flags, const char *dev_name, void *raw_data); | |
54ceac45 DH |
314 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, |
315 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
31f43471 AV |
316 | static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
317 | int flags, const char *dev_name, void *raw_data); | |
f7b422b1 DH |
318 | static void nfs4_kill_super(struct super_block *sb); |
319 | ||
320 | static struct file_system_type nfs4_fs_type = { | |
321 | .owner = THIS_MODULE, | |
322 | .name = "nfs4", | |
323 | .get_sb = nfs4_get_sb, | |
324 | .kill_sb = nfs4_kill_super, | |
349457cc | 325 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
326 | }; |
327 | ||
c02d7adf TM |
328 | static struct file_system_type nfs4_remote_fs_type = { |
329 | .owner = THIS_MODULE, | |
330 | .name = "nfs4", | |
31f43471 | 331 | .mount = nfs4_remote_mount, |
c02d7adf TM |
332 | .kill_sb = nfs4_kill_super, |
333 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
334 | }; | |
335 | ||
54ceac45 | 336 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
337 | .owner = THIS_MODULE, |
338 | .name = "nfs4", | |
31f43471 | 339 | .mount = nfs4_xdev_mount, |
f7b422b1 | 340 | .kill_sb = nfs4_kill_super, |
349457cc | 341 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
342 | }; |
343 | ||
c02d7adf TM |
344 | static struct file_system_type nfs4_remote_referral_fs_type = { |
345 | .owner = THIS_MODULE, | |
346 | .name = "nfs4", | |
31f43471 | 347 | .mount = nfs4_remote_referral_mount, |
c02d7adf TM |
348 | .kill_sb = nfs4_kill_super, |
349 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
350 | }; | |
351 | ||
54ceac45 | 352 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
353 | .owner = THIS_MODULE, |
354 | .name = "nfs4", | |
54ceac45 | 355 | .get_sb = nfs4_referral_get_sb, |
f7b422b1 | 356 | .kill_sb = nfs4_kill_super, |
349457cc | 357 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
358 | }; |
359 | ||
ee9b6d61 | 360 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
361 | .alloc_inode = nfs_alloc_inode, |
362 | .destroy_inode = nfs_destroy_inode, | |
363 | .write_inode = nfs_write_inode, | |
387c149b | 364 | .put_super = nfs_put_super, |
f7b422b1 | 365 | .statfs = nfs_statfs, |
b57922d9 | 366 | .evict_inode = nfs4_evict_inode, |
f7b422b1 DH |
367 | .umount_begin = nfs_umount_begin, |
368 | .show_options = nfs_show_options, | |
369 | .show_stats = nfs_show_stats, | |
48b605f8 | 370 | .remount_fs = nfs_remount, |
f7b422b1 DH |
371 | }; |
372 | #endif | |
373 | ||
8e1f936b RR |
374 | static struct shrinker acl_shrinker = { |
375 | .shrink = nfs_access_cache_shrinker, | |
376 | .seeks = DEFAULT_SEEKS, | |
377 | }; | |
979df72e | 378 | |
f7b422b1 DH |
379 | /* |
380 | * Register the NFS filesystems | |
381 | */ | |
382 | int __init register_nfs_fs(void) | |
383 | { | |
384 | int ret; | |
385 | ||
386 | ret = register_filesystem(&nfs_fs_type); | |
387 | if (ret < 0) | |
388 | goto error_0; | |
389 | ||
f7b422b1 DH |
390 | ret = nfs_register_sysctl(); |
391 | if (ret < 0) | |
392 | goto error_1; | |
89a09141 | 393 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
394 | ret = register_filesystem(&nfs4_fs_type); |
395 | if (ret < 0) | |
396 | goto error_2; | |
397 | #endif | |
8e1f936b | 398 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
399 | return 0; |
400 | ||
401 | #ifdef CONFIG_NFS_V4 | |
402 | error_2: | |
403 | nfs_unregister_sysctl(); | |
89a09141 | 404 | #endif |
f7b422b1 DH |
405 | error_1: |
406 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
407 | error_0: |
408 | return ret; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Unregister the NFS filesystems | |
413 | */ | |
414 | void __exit unregister_nfs_fs(void) | |
415 | { | |
8e1f936b | 416 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
417 | #ifdef CONFIG_NFS_V4 |
418 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 419 | #endif |
49af7ee1 | 420 | nfs_unregister_sysctl(); |
f7b422b1 DH |
421 | unregister_filesystem(&nfs_fs_type); |
422 | } | |
423 | ||
1daef0a8 | 424 | void nfs_sb_active(struct super_block *sb) |
ef818a28 | 425 | { |
1daef0a8 | 426 | struct nfs_server *server = NFS_SB(sb); |
ef818a28 | 427 | |
1daef0a8 TM |
428 | if (atomic_inc_return(&server->active) == 1) |
429 | atomic_inc(&sb->s_active); | |
ef818a28 SD |
430 | } |
431 | ||
1daef0a8 | 432 | void nfs_sb_deactive(struct super_block *sb) |
ef818a28 SD |
433 | { |
434 | struct nfs_server *server = NFS_SB(sb); | |
1daef0a8 TM |
435 | |
436 | if (atomic_dec_and_test(&server->active)) | |
437 | deactivate_super(sb); | |
ef818a28 SD |
438 | } |
439 | ||
f7b422b1 DH |
440 | /* |
441 | * Deliver file system statistics to userspace | |
442 | */ | |
816724e6 | 443 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 444 | { |
0c7d90cf | 445 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
446 | unsigned char blockbits; |
447 | unsigned long blockres; | |
0c7d90cf | 448 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
ca7e9a0d TM |
449 | struct nfs_fsstat res; |
450 | int error = -ENOMEM; | |
451 | ||
452 | res.fattr = nfs_alloc_fattr(); | |
453 | if (res.fattr == NULL) | |
454 | goto out_err; | |
f7b422b1 | 455 | |
8fa5c000 | 456 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
fbf3fdd2 MZ |
457 | if (unlikely(error == -ESTALE)) { |
458 | struct dentry *pd_dentry; | |
459 | ||
460 | pd_dentry = dget_parent(dentry); | |
461 | if (pd_dentry != NULL) { | |
462 | nfs_zap_caches(pd_dentry->d_inode); | |
463 | dput(pd_dentry); | |
464 | } | |
465 | } | |
ca7e9a0d | 466 | nfs_free_fattr(res.fattr); |
f7b422b1 DH |
467 | if (error < 0) |
468 | goto out_err; | |
ca7e9a0d | 469 | |
1a0ba9ae | 470 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
471 | |
472 | /* | |
473 | * Current versions of glibc do not correctly handle the | |
474 | * case where f_frsize != f_bsize. Eventually we want to | |
475 | * report the value of wtmult in this field. | |
476 | */ | |
0c7d90cf | 477 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
478 | |
479 | /* | |
480 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
481 | * are reported in units of f_frsize. Linux hasn't had | |
482 | * an f_frsize field in its statfs struct until recently, | |
483 | * thus historically Linux's sys_statfs reports these | |
484 | * fields in units of f_bsize. | |
485 | */ | |
0c7d90cf DH |
486 | buf->f_bsize = dentry->d_sb->s_blocksize; |
487 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
488 | blockres = (1 << blockbits) - 1; |
489 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
490 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
491 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
492 | ||
493 | buf->f_files = res.tfiles; | |
494 | buf->f_ffree = res.afiles; | |
495 | ||
496 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 497 | |
f7b422b1 DH |
498 | return 0; |
499 | ||
500 | out_err: | |
3110ff80 | 501 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 502 | return error; |
f7b422b1 DH |
503 | } |
504 | ||
7d4e2747 DH |
505 | /* |
506 | * Map the security flavour number to a name | |
507 | */ | |
81039f1f TM |
508 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
509 | { | |
7d4e2747 | 510 | static const struct { |
81039f1f TM |
511 | rpc_authflavor_t flavour; |
512 | const char *str; | |
513 | } sec_flavours[] = { | |
514 | { RPC_AUTH_NULL, "null" }, | |
515 | { RPC_AUTH_UNIX, "sys" }, | |
516 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
517 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
518 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
519 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
520 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
521 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
522 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
523 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
524 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 525 | { UINT_MAX, "unknown" } |
81039f1f TM |
526 | }; |
527 | int i; | |
528 | ||
4d81cd16 | 529 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
530 | if (sec_flavours[i].flavour == flavour) |
531 | break; | |
532 | } | |
533 | return sec_flavours[i].str; | |
534 | } | |
535 | ||
ee671b01 JL |
536 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
537 | int showdefaults) | |
538 | { | |
539 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; | |
540 | ||
541 | seq_printf(m, ",mountproto="); | |
542 | switch (sap->sa_family) { | |
543 | case AF_INET: | |
544 | switch (nfss->mountd_protocol) { | |
545 | case IPPROTO_UDP: | |
546 | seq_printf(m, RPCBIND_NETID_UDP); | |
547 | break; | |
548 | case IPPROTO_TCP: | |
549 | seq_printf(m, RPCBIND_NETID_TCP); | |
550 | break; | |
551 | default: | |
552 | if (showdefaults) | |
553 | seq_printf(m, "auto"); | |
554 | } | |
555 | break; | |
556 | case AF_INET6: | |
557 | switch (nfss->mountd_protocol) { | |
558 | case IPPROTO_UDP: | |
559 | seq_printf(m, RPCBIND_NETID_UDP6); | |
560 | break; | |
561 | case IPPROTO_TCP: | |
562 | seq_printf(m, RPCBIND_NETID_TCP6); | |
563 | break; | |
564 | default: | |
565 | if (showdefaults) | |
566 | seq_printf(m, "auto"); | |
567 | } | |
568 | break; | |
569 | default: | |
570 | if (showdefaults) | |
571 | seq_printf(m, "auto"); | |
572 | } | |
573 | } | |
574 | ||
82d101d5 CL |
575 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
576 | int showdefaults) | |
577 | { | |
578 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
579 | ||
d5eff1a3 BS |
580 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
581 | return; | |
582 | ||
82d101d5 CL |
583 | switch (sap->sa_family) { |
584 | case AF_INET: { | |
585 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
be859405 | 586 | seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
82d101d5 CL |
587 | break; |
588 | } | |
589 | case AF_INET6: { | |
590 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
d250e190 | 591 | seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
82d101d5 CL |
592 | break; |
593 | } | |
594 | default: | |
595 | if (showdefaults) | |
596 | seq_printf(m, ",mountaddr=unspecified"); | |
597 | } | |
598 | ||
599 | if (nfss->mountd_version || showdefaults) | |
600 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
601 | if (nfss->mountd_port || showdefaults) | |
602 | seq_printf(m, ",mountport=%u", nfss->mountd_port); | |
603 | ||
ee671b01 | 604 | nfs_show_mountd_netid(m, nfss, showdefaults); |
82d101d5 CL |
605 | } |
606 | ||
0be8189f TM |
607 | #ifdef CONFIG_NFS_V4 |
608 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
609 | int showdefaults) | |
610 | { | |
611 | struct nfs_client *clp = nfss->nfs_client; | |
612 | ||
613 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
614 | seq_printf(m, ",minorversion=%u", clp->cl_minorversion); | |
615 | } | |
616 | #else | |
617 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
618 | int showdefaults) | |
619 | { | |
620 | } | |
621 | #endif | |
622 | ||
f7b422b1 DH |
623 | /* |
624 | * Describe the mount options in force on this server representation | |
625 | */ | |
82d101d5 CL |
626 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
627 | int showdefaults) | |
f7b422b1 | 628 | { |
509de811 | 629 | static const struct proc_nfs_info { |
f7b422b1 | 630 | int flag; |
509de811 DH |
631 | const char *str; |
632 | const char *nostr; | |
f7b422b1 DH |
633 | } nfs_info[] = { |
634 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 | 635 | { NFS_MOUNT_POSIX, ",posix", "" }, |
f7b422b1 DH |
636 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
637 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
638 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
639 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 640 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
d740351b CL |
641 | { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
642 | { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, | |
f7b422b1 DH |
643 | { 0, NULL, NULL } |
644 | }; | |
509de811 | 645 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 646 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 647 | u32 version = clp->rpc_ops->version; |
7c563cc9 | 648 | int local_flock, local_fcntl; |
f7b422b1 | 649 | |
82d101d5 | 650 | seq_printf(m, ",vers=%u", version); |
2d767432 CL |
651 | seq_printf(m, ",rsize=%u", nfss->rsize); |
652 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
653 | if (nfss->bsize != 0) |
654 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
655 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 656 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 657 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 658 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 659 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 660 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 661 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 662 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 663 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
664 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
665 | if (nfss->flags & nfs_infop->flag) | |
666 | seq_puts(m, nfs_infop->str); | |
667 | else | |
668 | seq_puts(m, nfs_infop->nostr); | |
669 | } | |
56928edd | 670 | seq_printf(m, ",proto=%s", |
ee671b01 | 671 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
82d101d5 CL |
672 | if (version == 4) { |
673 | if (nfss->port != NFS_PORT) | |
674 | seq_printf(m, ",port=%u", nfss->port); | |
675 | } else | |
676 | if (nfss->port) | |
677 | seq_printf(m, ",port=%u", nfss->port); | |
678 | ||
33170233 TM |
679 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
680 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 681 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
682 | |
683 | if (version != 4) | |
684 | nfs_show_mountd_options(m, nfss, showdefaults); | |
0be8189f TM |
685 | else |
686 | nfs_show_nfsv4_options(m, nfss, showdefaults); | |
82d101d5 | 687 | |
b797cac7 DH |
688 | if (nfss->options & NFS_OPTION_FSCACHE) |
689 | seq_printf(m, ",fsc"); | |
9b00c643 PL |
690 | |
691 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { | |
692 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) | |
693 | seq_printf(m, ",lookupcache=none"); | |
694 | else | |
695 | seq_printf(m, ",lookupcache=pos"); | |
696 | } | |
7c563cc9 SJ |
697 | |
698 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; | |
699 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; | |
700 | ||
701 | if (!local_flock && !local_fcntl) | |
702 | seq_printf(m, ",local_lock=none"); | |
703 | else if (local_flock && local_fcntl) | |
704 | seq_printf(m, ",local_lock=all"); | |
705 | else if (local_flock) | |
706 | seq_printf(m, ",local_lock=flock"); | |
707 | else | |
708 | seq_printf(m, ",local_lock=posix"); | |
f7b422b1 DH |
709 | } |
710 | ||
711 | /* | |
712 | * Describe the mount options on this VFS mountpoint | |
713 | */ | |
714 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
715 | { | |
716 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
717 | ||
718 | nfs_show_mount_options(m, nfss, 0); | |
719 | ||
5d8515ca CL |
720 | seq_printf(m, ",addr=%s", |
721 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
722 | RPC_DISPLAY_ADDR)); | |
f7b422b1 DH |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Present statistical information for this VFS mountpoint | |
729 | */ | |
730 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
731 | { | |
732 | int i, cpu; | |
733 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
734 | struct rpc_auth *auth = nfss->client->cl_auth; | |
735 | struct nfs_iostats totals = { }; | |
736 | ||
737 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
738 | ||
739 | /* | |
740 | * Display all mount option settings | |
741 | */ | |
742 | seq_printf(m, "\n\topts:\t"); | |
743 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
744 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
745 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
746 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
747 | nfs_show_mount_options(m, nfss, 1); | |
748 | ||
749 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
750 | ||
751 | seq_printf(m, "\n\tcaps:\t"); | |
752 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
753 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
754 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
755 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
756 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
757 | |
758 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 759 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
760 | seq_printf(m, "\n\tnfsv4:\t"); |
761 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
762 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
763 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
764 | } | |
765 | #endif | |
766 | ||
767 | /* | |
768 | * Display security flavor in effect for this mount | |
769 | */ | |
2d767432 | 770 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 771 | if (auth->au_flavor) |
2d767432 | 772 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
773 | |
774 | /* | |
775 | * Display superblock I/O counters | |
776 | */ | |
777 | for_each_possible_cpu(cpu) { | |
778 | struct nfs_iostats *stats; | |
779 | ||
780 | preempt_disable(); | |
781 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
782 | ||
783 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
784 | totals.events[i] += stats->events[i]; | |
785 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
786 | totals.bytes[i] += stats->bytes[i]; | |
6a51091d DH |
787 | #ifdef CONFIG_NFS_FSCACHE |
788 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
789 | totals.fscache[i] += stats->fscache[i]; | |
790 | #endif | |
f7b422b1 DH |
791 | |
792 | preempt_enable(); | |
793 | } | |
794 | ||
795 | seq_printf(m, "\n\tevents:\t"); | |
796 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
797 | seq_printf(m, "%lu ", totals.events[i]); | |
798 | seq_printf(m, "\n\tbytes:\t"); | |
799 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
800 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
6a51091d DH |
801 | #ifdef CONFIG_NFS_FSCACHE |
802 | if (nfss->options & NFS_OPTION_FSCACHE) { | |
803 | seq_printf(m, "\n\tfsc:\t"); | |
804 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
805 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
806 | } | |
807 | #endif | |
f7b422b1 DH |
808 | seq_printf(m, "\n"); |
809 | ||
810 | rpc_print_iostats(m, nfss->client); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 817 | * in response to xdev traversals and referrals |
f7b422b1 | 818 | */ |
42faad99 | 819 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 820 | { |
67e55205 | 821 | struct nfs_server *server; |
fc6ae3cf TM |
822 | struct rpc_clnt *rpc; |
823 | ||
67e55205 | 824 | server = NFS_SB(sb); |
fc6ae3cf TM |
825 | /* -EIO all pending I/O */ |
826 | rpc = server->client_acl; | |
827 | if (!IS_ERR(rpc)) | |
828 | rpc_killall_tasks(rpc); | |
829 | rpc = server->client; | |
830 | if (!IS_ERR(rpc)) | |
831 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
832 | } |
833 | ||
c5811dbd | 834 | static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) |
9423a08a CL |
835 | { |
836 | struct nfs_parsed_mount_data *data; | |
837 | ||
838 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
839 | if (data) { | |
9423a08a CL |
840 | data->acregmin = NFS_DEF_ACREGMIN; |
841 | data->acregmax = NFS_DEF_ACREGMAX; | |
842 | data->acdirmin = NFS_DEF_ACDIRMIN; | |
843 | data->acdirmax = NFS_DEF_ACDIRMAX; | |
c5811dbd | 844 | data->mount_server.port = NFS_UNSPEC_PORT; |
9423a08a | 845 | data->nfs_server.port = NFS_UNSPEC_PORT; |
c5811dbd | 846 | data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
9423a08a CL |
847 | data->auth_flavors[0] = RPC_AUTH_UNIX; |
848 | data->auth_flavor_len = 1; | |
c5811dbd | 849 | data->version = version; |
9423a08a CL |
850 | data->minorversion = 0; |
851 | } | |
852 | return data; | |
853 | } | |
854 | ||
fc50d58f | 855 | /* |
cdcd7f9a CL |
856 | * Sanity-check a server address provided by the mount command. |
857 | * | |
858 | * Address family must be initialized, and address must not be | |
859 | * the ANY address for that family. | |
fc50d58f CL |
860 | */ |
861 | static int nfs_verify_server_address(struct sockaddr *addr) | |
862 | { | |
863 | switch (addr->sa_family) { | |
864 | case AF_INET: { | |
cdcd7f9a | 865 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 866 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
867 | } |
868 | case AF_INET6: { | |
869 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
870 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
871 | } |
872 | } | |
873 | ||
53a0b9c4 | 874 | dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
fc50d58f CL |
875 | return 0; |
876 | } | |
877 | ||
4cfd74fc CL |
878 | /* |
879 | * Select between a default port value and a user-specified port value. | |
880 | * If a zero value is set, then autobind will be used. | |
881 | */ | |
f5855fec | 882 | static void nfs_set_port(struct sockaddr *sap, int *port, |
4cfd74fc CL |
883 | const unsigned short default_port) |
884 | { | |
f5855fec TM |
885 | if (*port == NFS_UNSPEC_PORT) |
886 | *port = default_port; | |
4cfd74fc | 887 | |
f5855fec | 888 | rpc_set_port(sap, *port); |
4cfd74fc CL |
889 | } |
890 | ||
259875ef TM |
891 | /* |
892 | * Sanity check the NFS transport protocol. | |
893 | * | |
894 | */ | |
895 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
896 | { | |
897 | switch (mnt->nfs_server.protocol) { | |
898 | case XPRT_TRANSPORT_UDP: | |
899 | case XPRT_TRANSPORT_TCP: | |
900 | case XPRT_TRANSPORT_RDMA: | |
901 | break; | |
902 | default: | |
903 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
904 | } | |
905 | } | |
906 | ||
907 | /* | |
908 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
909 | * settings should depend upon the specified NFS transport. | |
910 | */ | |
911 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
912 | { | |
913 | nfs_validate_transport_protocol(mnt); | |
914 | ||
915 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
916 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
917 | return; | |
918 | switch (mnt->nfs_server.protocol) { | |
919 | case XPRT_TRANSPORT_UDP: | |
920 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
921 | break; | |
922 | case XPRT_TRANSPORT_TCP: | |
923 | case XPRT_TRANSPORT_RDMA: | |
924 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
925 | } | |
926 | } | |
927 | ||
01060c89 CL |
928 | /* |
929 | * Parse the value of the 'sec=' option. | |
01060c89 CL |
930 | */ |
931 | static int nfs_parse_security_flavors(char *value, | |
932 | struct nfs_parsed_mount_data *mnt) | |
933 | { | |
934 | substring_t args[MAX_OPT_ARGS]; | |
935 | ||
936 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
937 | ||
938 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
939 | case Opt_sec_none: | |
01060c89 CL |
940 | mnt->auth_flavors[0] = RPC_AUTH_NULL; |
941 | break; | |
942 | case Opt_sec_sys: | |
01060c89 CL |
943 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
944 | break; | |
945 | case Opt_sec_krb5: | |
01060c89 CL |
946 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
947 | break; | |
948 | case Opt_sec_krb5i: | |
01060c89 CL |
949 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
950 | break; | |
951 | case Opt_sec_krb5p: | |
01060c89 CL |
952 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
953 | break; | |
954 | case Opt_sec_lkey: | |
01060c89 CL |
955 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
956 | break; | |
957 | case Opt_sec_lkeyi: | |
01060c89 CL |
958 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
959 | break; | |
960 | case Opt_sec_lkeyp: | |
01060c89 CL |
961 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
962 | break; | |
963 | case Opt_sec_spkm: | |
01060c89 CL |
964 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
965 | break; | |
966 | case Opt_sec_spkmi: | |
01060c89 CL |
967 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
968 | break; | |
969 | case Opt_sec_spkmp: | |
01060c89 CL |
970 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
971 | break; | |
972 | default: | |
973 | return 0; | |
974 | } | |
975 | ||
059f90b3 | 976 | mnt->auth_flavor_len = 1; |
01060c89 CL |
977 | return 1; |
978 | } | |
979 | ||
bf0fd768 CL |
980 | /* |
981 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
982 | * a data structure. The whole mount string is processed; bad options are |
983 | * skipped as they are encountered. If there were no errors, return 1; | |
984 | * otherwise return 0 (zero). | |
bf0fd768 CL |
985 | */ |
986 | static int nfs_parse_mount_options(char *raw, | |
987 | struct nfs_parsed_mount_data *mnt) | |
988 | { | |
f9c3a380 | 989 | char *p, *string, *secdata; |
d23c45fd | 990 | int rc, sloppy = 0, invalid_option = 0; |
ee671b01 JL |
991 | unsigned short protofamily = AF_UNSPEC; |
992 | unsigned short mountfamily = AF_UNSPEC; | |
bf0fd768 CL |
993 | |
994 | if (!raw) { | |
995 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
996 | return 1; | |
997 | } | |
998 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
999 | ||
f9c3a380 EP |
1000 | secdata = alloc_secdata(); |
1001 | if (!secdata) | |
1002 | goto out_nomem; | |
1003 | ||
1004 | rc = security_sb_copy_data(raw, secdata); | |
1005 | if (rc) | |
1006 | goto out_security_failure; | |
1007 | ||
1008 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
1009 | if (rc) | |
1010 | goto out_security_failure; | |
1011 | ||
1012 | free_secdata(secdata); | |
1013 | ||
bf0fd768 CL |
1014 | while ((p = strsep(&raw, ",")) != NULL) { |
1015 | substring_t args[MAX_OPT_ARGS]; | |
a5a16bae CL |
1016 | unsigned long option; |
1017 | int token; | |
bf0fd768 CL |
1018 | |
1019 | if (!*p) | |
1020 | continue; | |
1021 | ||
1022 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
1023 | ||
1024 | token = match_token(p, nfs_mount_option_tokens, args); | |
1025 | switch (token) { | |
f45663ce CL |
1026 | |
1027 | /* | |
1028 | * boolean options: foo/nofoo | |
1029 | */ | |
bf0fd768 CL |
1030 | case Opt_soft: |
1031 | mnt->flags |= NFS_MOUNT_SOFT; | |
1032 | break; | |
1033 | case Opt_hard: | |
1034 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
1035 | break; | |
bf0fd768 CL |
1036 | case Opt_posix: |
1037 | mnt->flags |= NFS_MOUNT_POSIX; | |
1038 | break; | |
1039 | case Opt_noposix: | |
1040 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
1041 | break; | |
1042 | case Opt_cto: | |
1043 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
1044 | break; | |
1045 | case Opt_nocto: | |
1046 | mnt->flags |= NFS_MOUNT_NOCTO; | |
1047 | break; | |
1048 | case Opt_ac: | |
1049 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
1050 | break; | |
1051 | case Opt_noac: | |
1052 | mnt->flags |= NFS_MOUNT_NOAC; | |
1053 | break; | |
1054 | case Opt_lock: | |
1055 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1056 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
1057 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1058 | break; |
1059 | case Opt_nolock: | |
1060 | mnt->flags |= NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1061 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
1062 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1063 | break; |
1064 | case Opt_v2: | |
1065 | mnt->flags &= ~NFS_MOUNT_VER3; | |
764302cc | 1066 | mnt->version = 2; |
bf0fd768 CL |
1067 | break; |
1068 | case Opt_v3: | |
1069 | mnt->flags |= NFS_MOUNT_VER3; | |
764302cc | 1070 | mnt->version = 3; |
bf0fd768 | 1071 | break; |
764302cc CL |
1072 | case Opt_v4: |
1073 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1074 | mnt->version = 4; | |
1075 | break; | |
bf0fd768 CL |
1076 | case Opt_udp: |
1077 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1078 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1079 | break; |
1080 | case Opt_tcp: | |
1081 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1082 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1083 | break; |
2cf7ff7a TT |
1084 | case Opt_rdma: |
1085 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1086 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1087 | xprt_load_transport(p); |
2cf7ff7a | 1088 | break; |
bf0fd768 CL |
1089 | case Opt_acl: |
1090 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1091 | break; | |
1092 | case Opt_noacl: | |
1093 | mnt->flags |= NFS_MOUNT_NOACL; | |
1094 | break; | |
1095 | case Opt_rdirplus: | |
1096 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1097 | break; | |
1098 | case Opt_nordirplus: | |
1099 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1100 | break; | |
75180df2 TM |
1101 | case Opt_sharecache: |
1102 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1103 | break; | |
1104 | case Opt_nosharecache: | |
1105 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1106 | break; | |
d740351b CL |
1107 | case Opt_resvport: |
1108 | mnt->flags &= ~NFS_MOUNT_NORESVPORT; | |
1109 | break; | |
1110 | case Opt_noresvport: | |
1111 | mnt->flags |= NFS_MOUNT_NORESVPORT; | |
1112 | break; | |
b797cac7 DH |
1113 | case Opt_fscache: |
1114 | mnt->options |= NFS_OPTION_FSCACHE; | |
1115 | kfree(mnt->fscache_uniq); | |
1116 | mnt->fscache_uniq = NULL; | |
1117 | break; | |
1118 | case Opt_nofscache: | |
1119 | mnt->options &= ~NFS_OPTION_FSCACHE; | |
1120 | kfree(mnt->fscache_uniq); | |
1121 | mnt->fscache_uniq = NULL; | |
1122 | break; | |
bf0fd768 | 1123 | |
f45663ce CL |
1124 | /* |
1125 | * options that take numeric values | |
1126 | */ | |
bf0fd768 | 1127 | case Opt_port: |
a5a16bae CL |
1128 | string = match_strdup(args); |
1129 | if (string == NULL) | |
1130 | goto out_nomem; | |
1131 | rc = strict_strtoul(string, 10, &option); | |
1132 | kfree(string); | |
4be929be | 1133 | if (rc != 0 || option > USHRT_MAX) |
d23c45fd CL |
1134 | goto out_invalid_value; |
1135 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1136 | break; |
1137 | case Opt_rsize: | |
a5a16bae CL |
1138 | string = match_strdup(args); |
1139 | if (string == NULL) | |
1140 | goto out_nomem; | |
1141 | rc = strict_strtoul(string, 10, &option); | |
1142 | kfree(string); | |
1143 | if (rc != 0) | |
d23c45fd CL |
1144 | goto out_invalid_value; |
1145 | mnt->rsize = option; | |
bf0fd768 CL |
1146 | break; |
1147 | case Opt_wsize: | |
a5a16bae CL |
1148 | string = match_strdup(args); |
1149 | if (string == NULL) | |
1150 | goto out_nomem; | |
1151 | rc = strict_strtoul(string, 10, &option); | |
1152 | kfree(string); | |
1153 | if (rc != 0) | |
d23c45fd CL |
1154 | goto out_invalid_value; |
1155 | mnt->wsize = option; | |
bf0fd768 CL |
1156 | break; |
1157 | case Opt_bsize: | |
a5a16bae CL |
1158 | string = match_strdup(args); |
1159 | if (string == NULL) | |
1160 | goto out_nomem; | |
1161 | rc = strict_strtoul(string, 10, &option); | |
1162 | kfree(string); | |
1163 | if (rc != 0) | |
d23c45fd CL |
1164 | goto out_invalid_value; |
1165 | mnt->bsize = option; | |
bf0fd768 CL |
1166 | break; |
1167 | case Opt_timeo: | |
a5a16bae CL |
1168 | string = match_strdup(args); |
1169 | if (string == NULL) | |
1170 | goto out_nomem; | |
1171 | rc = strict_strtoul(string, 10, &option); | |
1172 | kfree(string); | |
1173 | if (rc != 0 || option == 0) | |
d23c45fd CL |
1174 | goto out_invalid_value; |
1175 | mnt->timeo = option; | |
bf0fd768 CL |
1176 | break; |
1177 | case Opt_retrans: | |
a5a16bae CL |
1178 | string = match_strdup(args); |
1179 | if (string == NULL) | |
1180 | goto out_nomem; | |
1181 | rc = strict_strtoul(string, 10, &option); | |
1182 | kfree(string); | |
1183 | if (rc != 0 || option == 0) | |
d23c45fd CL |
1184 | goto out_invalid_value; |
1185 | mnt->retrans = option; | |
bf0fd768 CL |
1186 | break; |
1187 | case Opt_acregmin: | |
a5a16bae CL |
1188 | string = match_strdup(args); |
1189 | if (string == NULL) | |
1190 | goto out_nomem; | |
1191 | rc = strict_strtoul(string, 10, &option); | |
1192 | kfree(string); | |
1193 | if (rc != 0) | |
d23c45fd CL |
1194 | goto out_invalid_value; |
1195 | mnt->acregmin = option; | |
bf0fd768 CL |
1196 | break; |
1197 | case Opt_acregmax: | |
a5a16bae CL |
1198 | string = match_strdup(args); |
1199 | if (string == NULL) | |
1200 | goto out_nomem; | |
1201 | rc = strict_strtoul(string, 10, &option); | |
1202 | kfree(string); | |
1203 | if (rc != 0) | |
d23c45fd CL |
1204 | goto out_invalid_value; |
1205 | mnt->acregmax = option; | |
bf0fd768 CL |
1206 | break; |
1207 | case Opt_acdirmin: | |
a5a16bae CL |
1208 | string = match_strdup(args); |
1209 | if (string == NULL) | |
1210 | goto out_nomem; | |
1211 | rc = strict_strtoul(string, 10, &option); | |
1212 | kfree(string); | |
1213 | if (rc != 0) | |
d23c45fd CL |
1214 | goto out_invalid_value; |
1215 | mnt->acdirmin = option; | |
bf0fd768 CL |
1216 | break; |
1217 | case Opt_acdirmax: | |
a5a16bae CL |
1218 | string = match_strdup(args); |
1219 | if (string == NULL) | |
1220 | goto out_nomem; | |
1221 | rc = strict_strtoul(string, 10, &option); | |
1222 | kfree(string); | |
1223 | if (rc != 0) | |
d23c45fd CL |
1224 | goto out_invalid_value; |
1225 | mnt->acdirmax = option; | |
bf0fd768 CL |
1226 | break; |
1227 | case Opt_actimeo: | |
a5a16bae CL |
1228 | string = match_strdup(args); |
1229 | if (string == NULL) | |
1230 | goto out_nomem; | |
1231 | rc = strict_strtoul(string, 10, &option); | |
1232 | kfree(string); | |
1233 | if (rc != 0) | |
d23c45fd CL |
1234 | goto out_invalid_value; |
1235 | mnt->acregmin = mnt->acregmax = | |
1236 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1237 | break; |
1238 | case Opt_namelen: | |
a5a16bae CL |
1239 | string = match_strdup(args); |
1240 | if (string == NULL) | |
1241 | goto out_nomem; | |
1242 | rc = strict_strtoul(string, 10, &option); | |
1243 | kfree(string); | |
1244 | if (rc != 0) | |
d23c45fd CL |
1245 | goto out_invalid_value; |
1246 | mnt->namlen = option; | |
bf0fd768 CL |
1247 | break; |
1248 | case Opt_mountport: | |
a5a16bae CL |
1249 | string = match_strdup(args); |
1250 | if (string == NULL) | |
1251 | goto out_nomem; | |
1252 | rc = strict_strtoul(string, 10, &option); | |
1253 | kfree(string); | |
4be929be | 1254 | if (rc != 0 || option > USHRT_MAX) |
d23c45fd CL |
1255 | goto out_invalid_value; |
1256 | mnt->mount_server.port = option; | |
bf0fd768 | 1257 | break; |
bf0fd768 | 1258 | case Opt_mountvers: |
a5a16bae CL |
1259 | string = match_strdup(args); |
1260 | if (string == NULL) | |
1261 | goto out_nomem; | |
1262 | rc = strict_strtoul(string, 10, &option); | |
1263 | kfree(string); | |
1264 | if (rc != 0 || | |
f45663ce | 1265 | option < NFS_MNT_VERSION || |
d23c45fd CL |
1266 | option > NFS_MNT3_VERSION) |
1267 | goto out_invalid_value; | |
1268 | mnt->mount_server.version = option; | |
bf0fd768 | 1269 | break; |
bf0fd768 | 1270 | case Opt_nfsvers: |
a5a16bae CL |
1271 | string = match_strdup(args); |
1272 | if (string == NULL) | |
1273 | goto out_nomem; | |
1274 | rc = strict_strtoul(string, 10, &option); | |
1275 | kfree(string); | |
1276 | if (rc != 0) | |
d23c45fd | 1277 | goto out_invalid_value; |
bf0fd768 | 1278 | switch (option) { |
f45663ce | 1279 | case NFS2_VERSION: |
bf0fd768 | 1280 | mnt->flags &= ~NFS_MOUNT_VER3; |
764302cc | 1281 | mnt->version = 2; |
bf0fd768 | 1282 | break; |
f45663ce | 1283 | case NFS3_VERSION: |
bf0fd768 | 1284 | mnt->flags |= NFS_MOUNT_VER3; |
764302cc CL |
1285 | mnt->version = 3; |
1286 | break; | |
764302cc CL |
1287 | case NFS4_VERSION: |
1288 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1289 | mnt->version = 4; | |
bf0fd768 CL |
1290 | break; |
1291 | default: | |
d23c45fd | 1292 | goto out_invalid_value; |
bf0fd768 CL |
1293 | } |
1294 | break; | |
3fd5be9e | 1295 | case Opt_minorversion: |
f3f4f4ed CL |
1296 | string = match_strdup(args); |
1297 | if (string == NULL) | |
1298 | goto out_nomem; | |
1299 | rc = strict_strtoul(string, 10, &option); | |
1300 | kfree(string); | |
1301 | if (rc != 0) | |
1302 | goto out_invalid_value; | |
1303 | if (option > NFS4_MAX_MINOR_VERSION) | |
1304 | goto out_invalid_value; | |
1305 | mnt->minorversion = option; | |
3fd5be9e | 1306 | break; |
bf0fd768 | 1307 | |
f45663ce CL |
1308 | /* |
1309 | * options that take text values | |
1310 | */ | |
bf0fd768 CL |
1311 | case Opt_sec: |
1312 | string = match_strdup(args); | |
1313 | if (string == NULL) | |
1314 | goto out_nomem; | |
01060c89 | 1315 | rc = nfs_parse_security_flavors(string, mnt); |
bf0fd768 | 1316 | kfree(string); |
f45663ce | 1317 | if (!rc) { |
f45663ce CL |
1318 | dfprintk(MOUNT, "NFS: unrecognized " |
1319 | "security flavor\n"); | |
d23c45fd | 1320 | return 0; |
f45663ce | 1321 | } |
bf0fd768 CL |
1322 | break; |
1323 | case Opt_proto: | |
1324 | string = match_strdup(args); | |
1325 | if (string == NULL) | |
1326 | goto out_nomem; | |
1327 | token = match_token(string, | |
1328 | nfs_xprt_protocol_tokens, args); | |
bf0fd768 | 1329 | |
ee671b01 | 1330 | protofamily = AF_INET; |
bf0fd768 | 1331 | switch (token) { |
ee671b01 JL |
1332 | case Opt_xprt_udp6: |
1333 | protofamily = AF_INET6; | |
fdb66ff4 | 1334 | case Opt_xprt_udp: |
bf0fd768 | 1335 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 1336 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
d23c45fd | 1337 | kfree(string); |
bf0fd768 | 1338 | break; |
ee671b01 JL |
1339 | case Opt_xprt_tcp6: |
1340 | protofamily = AF_INET6; | |
fdb66ff4 | 1341 | case Opt_xprt_tcp: |
bf0fd768 | 1342 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1343 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
d23c45fd | 1344 | kfree(string); |
bf0fd768 | 1345 | break; |
2cf7ff7a TT |
1346 | case Opt_xprt_rdma: |
1347 | /* vector side protocols to TCP */ | |
1348 | mnt->flags |= NFS_MOUNT_TCP; | |
1349 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1350 | xprt_load_transport(string); |
d23c45fd | 1351 | kfree(string); |
2cf7ff7a | 1352 | break; |
bf0fd768 | 1353 | default: |
f45663ce CL |
1354 | dfprintk(MOUNT, "NFS: unrecognized " |
1355 | "transport protocol\n"); | |
4223a4a1 | 1356 | kfree(string); |
d23c45fd | 1357 | return 0; |
bf0fd768 CL |
1358 | } |
1359 | break; | |
1360 | case Opt_mountproto: | |
1361 | string = match_strdup(args); | |
1362 | if (string == NULL) | |
1363 | goto out_nomem; | |
1364 | token = match_token(string, | |
1365 | nfs_xprt_protocol_tokens, args); | |
d508afb4 | 1366 | kfree(string); |
bf0fd768 | 1367 | |
ee671b01 | 1368 | mountfamily = AF_INET; |
bf0fd768 | 1369 | switch (token) { |
ee671b01 JL |
1370 | case Opt_xprt_udp6: |
1371 | mountfamily = AF_INET6; | |
fdb66ff4 | 1372 | case Opt_xprt_udp: |
0896a725 | 1373 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1374 | break; |
ee671b01 JL |
1375 | case Opt_xprt_tcp6: |
1376 | mountfamily = AF_INET6; | |
fdb66ff4 | 1377 | case Opt_xprt_tcp: |
0896a725 | 1378 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1379 | break; |
2cf7ff7a | 1380 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1381 | default: |
f45663ce CL |
1382 | dfprintk(MOUNT, "NFS: unrecognized " |
1383 | "transport protocol\n"); | |
d23c45fd | 1384 | return 0; |
bf0fd768 CL |
1385 | } |
1386 | break; | |
1387 | case Opt_addr: | |
1388 | string = match_strdup(args); | |
1389 | if (string == NULL) | |
1390 | goto out_nomem; | |
53a0b9c4 CL |
1391 | mnt->nfs_server.addrlen = |
1392 | rpc_pton(string, strlen(string), | |
1393 | (struct sockaddr *) | |
1394 | &mnt->nfs_server.address, | |
1395 | sizeof(mnt->nfs_server.address)); | |
bf0fd768 | 1396 | kfree(string); |
53a0b9c4 CL |
1397 | if (mnt->nfs_server.addrlen == 0) |
1398 | goto out_invalid_address; | |
bf0fd768 CL |
1399 | break; |
1400 | case Opt_clientaddr: | |
1401 | string = match_strdup(args); | |
1402 | if (string == NULL) | |
1403 | goto out_nomem; | |
fc601477 | 1404 | kfree(mnt->client_address); |
bf0fd768 CL |
1405 | mnt->client_address = string; |
1406 | break; | |
33832034 CL |
1407 | case Opt_mounthost: |
1408 | string = match_strdup(args); | |
1409 | if (string == NULL) | |
1410 | goto out_nomem; | |
fc601477 | 1411 | kfree(mnt->mount_server.hostname); |
33832034 CL |
1412 | mnt->mount_server.hostname = string; |
1413 | break; | |
0ac83779 | 1414 | case Opt_mountaddr: |
bf0fd768 CL |
1415 | string = match_strdup(args); |
1416 | if (string == NULL) | |
1417 | goto out_nomem; | |
53a0b9c4 CL |
1418 | mnt->mount_server.addrlen = |
1419 | rpc_pton(string, strlen(string), | |
1420 | (struct sockaddr *) | |
1421 | &mnt->mount_server.address, | |
1422 | sizeof(mnt->mount_server.address)); | |
bf0fd768 | 1423 | kfree(string); |
53a0b9c4 CL |
1424 | if (mnt->mount_server.addrlen == 0) |
1425 | goto out_invalid_address; | |
bf0fd768 | 1426 | break; |
7973c1f1 TM |
1427 | case Opt_lookupcache: |
1428 | string = match_strdup(args); | |
1429 | if (string == NULL) | |
1430 | goto out_nomem; | |
1431 | token = match_token(string, | |
1432 | nfs_lookupcache_tokens, args); | |
1433 | kfree(string); | |
1434 | switch (token) { | |
1435 | case Opt_lookupcache_all: | |
1436 | mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); | |
1437 | break; | |
1438 | case Opt_lookupcache_positive: | |
1439 | mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1440 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; | |
1441 | break; | |
1442 | case Opt_lookupcache_none: | |
1443 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1444 | break; | |
1445 | default: | |
7973c1f1 TM |
1446 | dfprintk(MOUNT, "NFS: invalid " |
1447 | "lookupcache argument\n"); | |
d23c45fd | 1448 | return 0; |
7973c1f1 TM |
1449 | }; |
1450 | break; | |
a6d5ff64 CL |
1451 | case Opt_fscache_uniq: |
1452 | string = match_strdup(args); | |
1453 | if (string == NULL) | |
1454 | goto out_nomem; | |
1455 | kfree(mnt->fscache_uniq); | |
1456 | mnt->fscache_uniq = string; | |
1457 | mnt->options |= NFS_OPTION_FSCACHE; | |
1458 | break; | |
5eebde23 SJ |
1459 | case Opt_local_lock: |
1460 | string = match_strdup(args); | |
1461 | if (string == NULL) | |
1462 | goto out_nomem; | |
1463 | token = match_token(string, nfs_local_lock_tokens, | |
1464 | args); | |
1465 | kfree(string); | |
1466 | switch (token) { | |
1467 | case Opt_local_lock_all: | |
1468 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | | |
1469 | NFS_MOUNT_LOCAL_FCNTL); | |
1470 | break; | |
1471 | case Opt_local_lock_flock: | |
1472 | mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; | |
1473 | break; | |
1474 | case Opt_local_lock_posix: | |
1475 | mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; | |
1476 | break; | |
1477 | case Opt_local_lock_none: | |
1478 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | | |
1479 | NFS_MOUNT_LOCAL_FCNTL); | |
1480 | break; | |
1481 | default: | |
1482 | dfprintk(MOUNT, "NFS: invalid " | |
1483 | "local_lock argument\n"); | |
1484 | return 0; | |
1485 | }; | |
1486 | break; | |
bf0fd768 | 1487 | |
f45663ce CL |
1488 | /* |
1489 | * Special options | |
1490 | */ | |
1491 | case Opt_sloppy: | |
1492 | sloppy = 1; | |
1493 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1494 | break; | |
bf0fd768 CL |
1495 | case Opt_userspace: |
1496 | case Opt_deprecated: | |
d33e4dfe CL |
1497 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1498 | "'%s'\n", p); | |
bf0fd768 CL |
1499 | break; |
1500 | ||
1501 | default: | |
d23c45fd | 1502 | invalid_option = 1; |
f45663ce CL |
1503 | dfprintk(MOUNT, "NFS: unrecognized mount option " |
1504 | "'%s'\n", p); | |
bf0fd768 CL |
1505 | } |
1506 | } | |
1507 | ||
d23c45fd CL |
1508 | if (!sloppy && invalid_option) |
1509 | return 0; | |
1510 | ||
ee671b01 JL |
1511 | /* |
1512 | * verify that any proto=/mountproto= options match the address | |
1513 | * familiies in the addr=/mountaddr= options. | |
1514 | */ | |
1515 | if (protofamily != AF_UNSPEC && | |
1516 | protofamily != mnt->nfs_server.address.ss_family) | |
1517 | goto out_proto_mismatch; | |
1518 | ||
1519 | if (mountfamily != AF_UNSPEC) { | |
1520 | if (mnt->mount_server.addrlen) { | |
1521 | if (mountfamily != mnt->mount_server.address.ss_family) | |
1522 | goto out_mountproto_mismatch; | |
1523 | } else { | |
1524 | if (mountfamily != mnt->nfs_server.address.ss_family) | |
1525 | goto out_mountproto_mismatch; | |
1526 | } | |
1527 | } | |
1528 | ||
bf0fd768 CL |
1529 | return 1; |
1530 | ||
ee671b01 JL |
1531 | out_mountproto_mismatch: |
1532 | printk(KERN_INFO "NFS: mount server address does not match mountproto= " | |
1533 | "option\n"); | |
1534 | return 0; | |
1535 | out_proto_mismatch: | |
1536 | printk(KERN_INFO "NFS: server address does not match proto= option\n"); | |
1537 | return 0; | |
53a0b9c4 CL |
1538 | out_invalid_address: |
1539 | printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); | |
1540 | return 0; | |
d23c45fd | 1541 | out_invalid_value: |
53a0b9c4 | 1542 | printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
d23c45fd | 1543 | return 0; |
bf0fd768 CL |
1544 | out_nomem: |
1545 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1546 | return 0; | |
f9c3a380 EP |
1547 | out_security_failure: |
1548 | free_secdata(secdata); | |
1549 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1550 | return 0; | |
bf0fd768 CL |
1551 | } |
1552 | ||
ec88f28d CL |
1553 | /* |
1554 | * Match the requested auth flavors with the list returned by | |
1555 | * the server. Returns zero and sets the mount's authentication | |
1556 | * flavor on success; returns -EACCES if server does not support | |
1557 | * the requested flavor. | |
1558 | */ | |
1559 | static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, | |
1560 | struct nfs_mount_request *request) | |
1561 | { | |
1562 | unsigned int i, j, server_authlist_len = *(request->auth_flav_len); | |
1563 | ||
5eecfde6 CL |
1564 | /* |
1565 | * Certain releases of Linux's mountd return an empty | |
1566 | * flavor list. To prevent behavioral regression with | |
1567 | * these servers (ie. rejecting mounts that used to | |
1568 | * succeed), revert to pre-2.6.32 behavior (no checking) | |
1569 | * if the returned flavor list is empty. | |
1570 | */ | |
1571 | if (server_authlist_len == 0) | |
1572 | return 0; | |
1573 | ||
ec88f28d CL |
1574 | /* |
1575 | * We avoid sophisticated negotiating here, as there are | |
1576 | * plenty of cases where we can get it wrong, providing | |
1577 | * either too little or too much security. | |
1578 | * | |
1579 | * RFC 2623, section 2.7 suggests we SHOULD prefer the | |
1580 | * flavor listed first. However, some servers list | |
1581 | * AUTH_NULL first. Our caller plants AUTH_SYS, the | |
1582 | * preferred default, in args->auth_flavors[0] if user | |
1583 | * didn't specify sec= mount option. | |
1584 | */ | |
1585 | for (i = 0; i < args->auth_flavor_len; i++) | |
1586 | for (j = 0; j < server_authlist_len; j++) | |
1587 | if (args->auth_flavors[i] == request->auth_flavs[j]) { | |
1588 | dfprintk(MOUNT, "NFS: using auth flavor %d\n", | |
1589 | request->auth_flavs[j]); | |
1590 | args->auth_flavors[0] = request->auth_flavs[j]; | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); | |
1595 | nfs_umount(request); | |
1596 | return -EACCES; | |
1597 | } | |
1598 | ||
0076d7b7 CL |
1599 | /* |
1600 | * Use the remote server's MOUNT service to request the NFS file handle | |
1601 | * corresponding to the provided path. | |
1602 | */ | |
1603 | static int nfs_try_mount(struct nfs_parsed_mount_data *args, | |
1604 | struct nfs_fh *root_fh) | |
1605 | { | |
ec88f28d CL |
1606 | rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
1607 | unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); | |
c5d120f8 CL |
1608 | struct nfs_mount_request request = { |
1609 | .sap = (struct sockaddr *) | |
1610 | &args->mount_server.address, | |
1611 | .dirpath = args->nfs_server.export_path, | |
1612 | .protocol = args->mount_server.protocol, | |
1613 | .fh = root_fh, | |
50a737f8 | 1614 | .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
ec88f28d CL |
1615 | .auth_flav_len = &server_authlist_len, |
1616 | .auth_flavs = server_authlist, | |
c5d120f8 | 1617 | }; |
4c568017 | 1618 | int status; |
0076d7b7 CL |
1619 | |
1620 | if (args->mount_server.version == 0) { | |
8a6e5deb TM |
1621 | switch (args->version) { |
1622 | default: | |
1623 | args->mount_server.version = NFS_MNT3_VERSION; | |
1624 | break; | |
1625 | case 2: | |
1626 | args->mount_server.version = NFS_MNT_VERSION; | |
1627 | } | |
0076d7b7 | 1628 | } |
c5d120f8 | 1629 | request.version = args->mount_server.version; |
0076d7b7 | 1630 | |
33832034 | 1631 | if (args->mount_server.hostname) |
c5d120f8 | 1632 | request.hostname = args->mount_server.hostname; |
33832034 | 1633 | else |
c5d120f8 | 1634 | request.hostname = args->nfs_server.hostname; |
33832034 | 1635 | |
0076d7b7 CL |
1636 | /* |
1637 | * Construct the mount server's address. | |
1638 | */ | |
4c568017 | 1639 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
c5d120f8 | 1640 | memcpy(request.sap, &args->nfs_server.address, |
4c568017 CL |
1641 | args->nfs_server.addrlen); |
1642 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1643 | } | |
c5d120f8 | 1644 | request.salen = args->mount_server.addrlen; |
f5855fec | 1645 | nfs_set_port(request.sap, &args->mount_server.port, 0); |
0076d7b7 CL |
1646 | |
1647 | /* | |
1648 | * Now ask the mount server to map our export path | |
1649 | * to a file handle. | |
1650 | */ | |
c5d120f8 | 1651 | status = nfs_mount(&request); |
ec88f28d CL |
1652 | if (status != 0) { |
1653 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", | |
1654 | request.hostname, status); | |
1655 | return status; | |
1656 | } | |
0076d7b7 | 1657 | |
ec88f28d CL |
1658 | /* |
1659 | * MNTv1 (NFSv2) does not support auth flavor negotiation. | |
1660 | */ | |
1661 | if (args->mount_server.version != NFS_MNT3_VERSION) | |
1662 | return 0; | |
1663 | return nfs_walk_authlist(args, &request); | |
0076d7b7 CL |
1664 | } |
1665 | ||
d1aa0825 CL |
1666 | static int nfs_parse_simple_hostname(const char *dev_name, |
1667 | char **hostname, size_t maxnamlen, | |
1668 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1669 | { |
1670 | size_t len; | |
1671 | char *colon, *comma; | |
1672 | ||
1673 | colon = strchr(dev_name, ':'); | |
1674 | if (colon == NULL) | |
1675 | goto out_bad_devname; | |
1676 | ||
1677 | len = colon - dev_name; | |
1678 | if (len > maxnamlen) | |
1679 | goto out_hostname; | |
1680 | ||
1681 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
1682 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); | |
1683 | if (!*hostname) | |
1684 | goto out_nomem; | |
1685 | ||
1686 | /* kill possible hostname list: not supported */ | |
1687 | comma = strchr(*hostname, ','); | |
1688 | if (comma != NULL) { | |
1689 | if (comma == *hostname) | |
1690 | goto out_bad_devname; | |
1691 | *comma = '\0'; | |
1692 | } | |
1693 | ||
1694 | colon++; | |
1695 | len = strlen(colon); | |
1696 | if (len > maxpathlen) | |
1697 | goto out_path; | |
1698 | *export_path = kstrndup(colon, len, GFP_KERNEL); | |
1699 | if (!*export_path) | |
1700 | goto out_nomem; | |
1701 | ||
1702 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); | |
1703 | return 0; | |
1704 | ||
1705 | out_bad_devname: | |
1706 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1707 | return -EINVAL; | |
1708 | ||
1709 | out_nomem: | |
1710 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1711 | return -ENOMEM; | |
1712 | ||
1713 | out_hostname: | |
1714 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1715 | return -ENAMETOOLONG; | |
1716 | ||
1717 | out_path: | |
1718 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1719 | return -ENAMETOOLONG; | |
1720 | } | |
1721 | ||
d1aa0825 CL |
1722 | /* |
1723 | * Hostname has square brackets around it because it contains one or | |
1724 | * more colons. We look for the first closing square bracket, and a | |
1725 | * colon must follow it. | |
1726 | */ | |
1727 | static int nfs_parse_protected_hostname(const char *dev_name, | |
1728 | char **hostname, size_t maxnamlen, | |
1729 | char **export_path, size_t maxpathlen) | |
1730 | { | |
1731 | size_t len; | |
1732 | char *start, *end; | |
1733 | ||
1734 | start = (char *)(dev_name + 1); | |
1735 | ||
1736 | end = strchr(start, ']'); | |
1737 | if (end == NULL) | |
1738 | goto out_bad_devname; | |
1739 | if (*(end + 1) != ':') | |
1740 | goto out_bad_devname; | |
1741 | ||
1742 | len = end - start; | |
1743 | if (len > maxnamlen) | |
1744 | goto out_hostname; | |
1745 | ||
1746 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
1747 | *hostname = kstrndup(start, len, GFP_KERNEL); | |
1748 | if (*hostname == NULL) | |
1749 | goto out_nomem; | |
1750 | ||
1751 | end += 2; | |
1752 | len = strlen(end); | |
1753 | if (len > maxpathlen) | |
1754 | goto out_path; | |
1755 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1756 | if (!*export_path) | |
1757 | goto out_nomem; | |
1758 | ||
1759 | return 0; | |
1760 | ||
1761 | out_bad_devname: | |
1762 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1763 | return -EINVAL; | |
1764 | ||
1765 | out_nomem: | |
1766 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1767 | return -ENOMEM; | |
1768 | ||
1769 | out_hostname: | |
1770 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1771 | return -ENAMETOOLONG; | |
1772 | ||
1773 | out_path: | |
1774 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1775 | return -ENAMETOOLONG; | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Split "dev_name" into "hostname:export_path". | |
1780 | * | |
1781 | * The leftmost colon demarks the split between the server's hostname | |
1782 | * and the export path. If the hostname starts with a left square | |
1783 | * bracket, then it may contain colons. | |
1784 | * | |
1785 | * Note: caller frees hostname and export path, even on error. | |
1786 | */ | |
1787 | static int nfs_parse_devname(const char *dev_name, | |
1788 | char **hostname, size_t maxnamlen, | |
1789 | char **export_path, size_t maxpathlen) | |
1790 | { | |
1791 | if (*dev_name == '[') | |
1792 | return nfs_parse_protected_hostname(dev_name, | |
1793 | hostname, maxnamlen, | |
1794 | export_path, maxpathlen); | |
1795 | ||
1796 | return nfs_parse_simple_hostname(dev_name, | |
1797 | hostname, maxnamlen, | |
1798 | export_path, maxpathlen); | |
1799 | } | |
1800 | ||
f7b422b1 | 1801 | /* |
54ceac45 DH |
1802 | * Validate the NFS2/NFS3 mount data |
1803 | * - fills in the mount root filehandle | |
136d558c CL |
1804 | * |
1805 | * For option strings, user space handles the following behaviors: | |
1806 | * | |
1807 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1808 | * | |
1809 | * + failure mode: how to behave if a mount request can't be handled | |
1810 | * immediately ("fg/bg" option) | |
1811 | * | |
1812 | * + retry: how often to retry a mount request ("retry=" option) | |
1813 | * | |
1814 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1815 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1816 | */ |
2283f8d6 TT |
1817 | static int nfs_validate_mount_data(void *options, |
1818 | struct nfs_parsed_mount_data *args, | |
136d558c CL |
1819 | struct nfs_fh *mntfh, |
1820 | const char *dev_name) | |
f7b422b1 | 1821 | { |
2283f8d6 | 1822 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
4cfd74fc | 1823 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
136d558c | 1824 | |
5df36e78 CL |
1825 | if (data == NULL) |
1826 | goto out_no_data; | |
f7b422b1 | 1827 | |
54ceac45 | 1828 | switch (data->version) { |
5df36e78 CL |
1829 | case 1: |
1830 | data->namlen = 0; | |
1831 | case 2: | |
1832 | data->bsize = 0; | |
1833 | case 3: | |
1834 | if (data->flags & NFS_MOUNT_VER3) | |
1835 | goto out_no_v3; | |
1836 | data->root.size = NFS2_FHSIZE; | |
1837 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1838 | case 4: | |
1839 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1840 | goto out_no_sec; | |
1841 | case 5: | |
1842 | memset(data->context, 0, sizeof(data->context)); | |
1843 | case 6: | |
b7e24457 TM |
1844 | if (data->flags & NFS_MOUNT_VER3) { |
1845 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1846 | goto out_invalid_fh; | |
5df36e78 | 1847 | mntfh->size = data->root.size; |
764302cc CL |
1848 | args->version = 3; |
1849 | } else { | |
5df36e78 | 1850 | mntfh->size = NFS2_FHSIZE; |
764302cc CL |
1851 | args->version = 2; |
1852 | } | |
5df36e78 | 1853 | |
5df36e78 CL |
1854 | |
1855 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1856 | if (mntfh->size < sizeof(mntfh->data)) | |
1857 | memset(mntfh->data + mntfh->size, 0, | |
1858 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1859 | |
2283f8d6 TT |
1860 | /* |
1861 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1862 | * can deal with. | |
1863 | */ | |
ff3525a5 | 1864 | args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
d5eff1a3 | 1865 | args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
2283f8d6 TT |
1866 | args->rsize = data->rsize; |
1867 | args->wsize = data->wsize; | |
2283f8d6 TT |
1868 | args->timeo = data->timeo; |
1869 | args->retrans = data->retrans; | |
1870 | args->acregmin = data->acregmin; | |
1871 | args->acregmax = data->acregmax; | |
1872 | args->acdirmin = data->acdirmin; | |
1873 | args->acdirmax = data->acdirmax; | |
4c568017 | 1874 | |
4cfd74fc | 1875 | memcpy(sap, &data->addr, sizeof(data->addr)); |
4c568017 | 1876 | args->nfs_server.addrlen = sizeof(data->addr); |
4cfd74fc | 1877 | if (!nfs_verify_server_address(sap)) |
4c568017 CL |
1878 | goto out_no_address; |
1879 | ||
2283f8d6 | 1880 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1881 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1882 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1883 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1884 | args->namlen = data->namlen; | |
1885 | args->bsize = data->bsize; | |
dd07c947 CL |
1886 | |
1887 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1888 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1889 | if (!args->nfs_server.hostname) |
1890 | goto out_nomem; | |
f9c3a380 | 1891 | |
5eebde23 SJ |
1892 | if (!(data->flags & NFS_MOUNT_NONLM)) |
1893 | args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| | |
1894 | NFS_MOUNT_LOCAL_FCNTL); | |
1895 | else | |
1896 | args->flags |= (NFS_MOUNT_LOCAL_FLOCK| | |
1897 | NFS_MOUNT_LOCAL_FCNTL); | |
f9c3a380 EP |
1898 | /* |
1899 | * The legacy version 6 binary mount data from userspace has a | |
1900 | * field used only to transport selinux information into the | |
1901 | * the kernel. To continue to support that functionality we | |
1902 | * have a touch of selinux knowledge here in the NFS code. The | |
1903 | * userspace code converted context=blah to just blah so we are | |
1904 | * converting back to the full string selinux understands. | |
1905 | */ | |
1906 | if (data->context[0]){ | |
1907 | #ifdef CONFIG_SECURITY_SELINUX | |
1908 | int rc; | |
1909 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1910 | if (!opts_str) | |
1911 | return -ENOMEM; | |
1912 | strcpy(opts_str, "context="); | |
1913 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1914 | strcat(opts_str, &data->context[0]); | |
1915 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1916 | kfree(opts_str); | |
1917 | if (rc) | |
1918 | return rc; | |
1919 | #else | |
1920 | return -EINVAL; | |
1921 | #endif | |
1922 | } | |
1923 | ||
5df36e78 | 1924 | break; |
136d558c | 1925 | default: { |
136d558c | 1926 | int status; |
136d558c | 1927 | |
2283f8d6 TT |
1928 | if (nfs_parse_mount_options((char *)options, args) == 0) |
1929 | return -EINVAL; | |
136d558c | 1930 | |
4cfd74fc | 1931 | if (!nfs_verify_server_address(sap)) |
6e88e061 CL |
1932 | goto out_no_address; |
1933 | ||
764302cc CL |
1934 | if (args->version == 4) |
1935 | #ifdef CONFIG_NFS_V4 | |
1936 | return nfs4_validate_text_mount_data(options, | |
1937 | args, dev_name); | |
1938 | #else | |
1939 | goto out_v4_not_compiled; | |
1940 | #endif | |
1941 | ||
f5855fec | 1942 | nfs_set_port(sap, &args->nfs_server.port, 0); |
ed596a8a | 1943 | |
259875ef TM |
1944 | nfs_set_mount_transport_protocol(args); |
1945 | ||
dc045898 CL |
1946 | status = nfs_parse_devname(dev_name, |
1947 | &args->nfs_server.hostname, | |
1948 | PAGE_SIZE, | |
1949 | &args->nfs_server.export_path, | |
1950 | NFS_MAXPATHLEN); | |
1951 | if (!status) | |
1952 | status = nfs_try_mount(args, mntfh); | |
136d558c | 1953 | |
dc045898 CL |
1954 | kfree(args->nfs_server.export_path); |
1955 | args->nfs_server.export_path = NULL; | |
136d558c | 1956 | |
136d558c | 1957 | if (status) |
fdc6e2c8 | 1958 | return status; |
136d558c | 1959 | |
136d558c CL |
1960 | break; |
1961 | } | |
f7b422b1 | 1962 | } |
54ceac45 DH |
1963 | |
1964 | #ifndef CONFIG_NFS_V3 | |
8a6e5deb | 1965 | if (args->version == 3) |
5df36e78 CL |
1966 | goto out_v3_not_compiled; |
1967 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1968 | |
5df36e78 | 1969 | return 0; |
f7b422b1 | 1970 | |
5df36e78 CL |
1971 | out_no_data: |
1972 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1973 | return -EINVAL; | |
54ceac45 | 1974 | |
5df36e78 CL |
1975 | out_no_v3: |
1976 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1977 | data->version); | |
1978 | return -EINVAL; | |
f7b422b1 | 1979 | |
5df36e78 CL |
1980 | out_no_sec: |
1981 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1982 | return -EINVAL; | |
1983 | ||
5df36e78 CL |
1984 | #ifndef CONFIG_NFS_V3 |
1985 | out_v3_not_compiled: | |
1986 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1987 | return -EPROTONOSUPPORT; | |
1988 | #endif /* !CONFIG_NFS_V3 */ | |
1989 | ||
764302cc CL |
1990 | #ifndef CONFIG_NFS_V4 |
1991 | out_v4_not_compiled: | |
1992 | dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); | |
1993 | return -EPROTONOSUPPORT; | |
1994 | #endif /* !CONFIG_NFS_V4 */ | |
1995 | ||
63649bd7 CG |
1996 | out_nomem: |
1997 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
1998 | return -ENOMEM; | |
1999 | ||
5df36e78 CL |
2000 | out_no_address: |
2001 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2002 | return -EINVAL; | |
2003 | ||
2004 | out_invalid_fh: | |
2005 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
2006 | return -EINVAL; | |
f7b422b1 DH |
2007 | } |
2008 | ||
48b605f8 JL |
2009 | static int |
2010 | nfs_compare_remount_data(struct nfs_server *nfss, | |
2011 | struct nfs_parsed_mount_data *data) | |
2012 | { | |
2013 | if (data->flags != nfss->flags || | |
2014 | data->rsize != nfss->rsize || | |
2015 | data->wsize != nfss->wsize || | |
2016 | data->retrans != nfss->client->cl_timeout->to_retries || | |
2017 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
2018 | data->acregmin != nfss->acregmin / HZ || | |
2019 | data->acregmax != nfss->acregmax / HZ || | |
2020 | data->acdirmin != nfss->acdirmin / HZ || | |
2021 | data->acdirmax != nfss->acdirmax / HZ || | |
2022 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
bcd2ea17 | 2023 | data->nfs_server.port != nfss->port || |
48b605f8 | 2024 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
a1be9eee SR |
2025 | !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
2026 | (struct sockaddr *)&nfss->nfs_client->cl_addr)) | |
48b605f8 JL |
2027 | return -EINVAL; |
2028 | ||
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | static int | |
2033 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
2034 | { | |
2035 | int error; | |
2036 | struct nfs_server *nfss = sb->s_fs_info; | |
2037 | struct nfs_parsed_mount_data *data; | |
2038 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
2039 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 2040 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
2041 | |
2042 | /* | |
2043 | * Userspace mount programs that send binary options generally send | |
2044 | * them populated with default values. We have no way to know which | |
2045 | * ones were explicitly specified. Fall back to legacy behavior and | |
2046 | * just return success. | |
2047 | */ | |
31c94469 MZ |
2048 | if ((nfsvers == 4 && (!options4 || options4->version == 1)) || |
2049 | (nfsvers <= 3 && (!options || (options->version >= 1 && | |
2050 | options->version <= 6)))) | |
48b605f8 JL |
2051 | return 0; |
2052 | ||
2053 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2054 | if (data == NULL) | |
2055 | return -ENOMEM; | |
2056 | ||
2057 | /* fill out struct with values from existing mount */ | |
2058 | data->flags = nfss->flags; | |
2059 | data->rsize = nfss->rsize; | |
2060 | data->wsize = nfss->wsize; | |
2061 | data->retrans = nfss->client->cl_timeout->to_retries; | |
2062 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
2063 | data->acregmin = nfss->acregmin / HZ; | |
2064 | data->acregmax = nfss->acregmax / HZ; | |
2065 | data->acdirmin = nfss->acdirmin / HZ; | |
2066 | data->acdirmax = nfss->acdirmax / HZ; | |
2067 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
bcd2ea17 | 2068 | data->nfs_server.port = nfss->port; |
48b605f8 JL |
2069 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
2070 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
2071 | data->nfs_server.addrlen); | |
2072 | ||
2073 | /* overwrite those values with any that were specified */ | |
2074 | error = nfs_parse_mount_options((char *)options, data); | |
2075 | if (error < 0) | |
2076 | goto out; | |
2077 | ||
2078 | /* compare new mount options with old ones */ | |
2079 | error = nfs_compare_remount_data(nfss, data); | |
2080 | out: | |
2081 | kfree(data); | |
2082 | return error; | |
2083 | } | |
2084 | ||
f7b422b1 | 2085 | /* |
54ceac45 | 2086 | * Initialise the common bits of the superblock |
f7b422b1 | 2087 | */ |
54ceac45 | 2088 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 2089 | { |
54ceac45 | 2090 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2091 | |
54ceac45 | 2092 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 2093 | |
54ceac45 DH |
2094 | /* We probably want something more informative here */ |
2095 | snprintf(sb->s_id, sizeof(sb->s_id), | |
2096 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 2097 | |
54ceac45 DH |
2098 | if (sb->s_blocksize == 0) |
2099 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
2100 | &sb->s_blocksize_bits); | |
f7b422b1 | 2101 | |
54ceac45 DH |
2102 | if (server->flags & NFS_MOUNT_NOAC) |
2103 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 2104 | |
32a88aa1 JA |
2105 | sb->s_bdi = &server->backing_dev_info; |
2106 | ||
54ceac45 | 2107 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
2108 | } |
2109 | ||
2110 | /* | |
54ceac45 | 2111 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 2112 | */ |
2283f8d6 TT |
2113 | static void nfs_fill_super(struct super_block *sb, |
2114 | struct nfs_parsed_mount_data *data) | |
f7b422b1 DH |
2115 | { |
2116 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 2117 | |
54ceac45 DH |
2118 | sb->s_blocksize_bits = 0; |
2119 | sb->s_blocksize = 0; | |
2120 | if (data->bsize) | |
2121 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 2122 | |
8a6e5deb | 2123 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2124 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2125 | * so ourselves when necessary. | |
2126 | */ | |
2127 | sb->s_flags |= MS_POSIXACL; | |
2128 | sb->s_time_gran = 1; | |
816724e6 | 2129 | } |
54ceac45 DH |
2130 | |
2131 | sb->s_op = &nfs_sops; | |
2132 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2133 | } |
2134 | ||
2135 | /* | |
54ceac45 | 2136 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 2137 | */ |
54ceac45 DH |
2138 | static void nfs_clone_super(struct super_block *sb, |
2139 | const struct super_block *old_sb) | |
f7b422b1 | 2140 | { |
54ceac45 DH |
2141 | struct nfs_server *server = NFS_SB(sb); |
2142 | ||
2143 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
2144 | sb->s_blocksize = old_sb->s_blocksize; | |
2145 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2146 | |
8a6e5deb | 2147 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2148 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2149 | * so ourselves when necessary. | |
f7b422b1 DH |
2150 | */ |
2151 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 2152 | sb->s_time_gran = 1; |
f7b422b1 DH |
2153 | } |
2154 | ||
54ceac45 DH |
2155 | sb->s_op = old_sb->s_op; |
2156 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2157 | } |
2158 | ||
275a5d24 TM |
2159 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) |
2160 | { | |
2161 | const struct nfs_server *a = s->s_fs_info; | |
2162 | const struct rpc_clnt *clnt_a = a->client; | |
2163 | const struct rpc_clnt *clnt_b = b->client; | |
2164 | ||
2165 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
2166 | goto Ebusy; | |
2167 | if (a->nfs_client != b->nfs_client) | |
2168 | goto Ebusy; | |
2169 | if (a->flags != b->flags) | |
2170 | goto Ebusy; | |
2171 | if (a->wsize != b->wsize) | |
2172 | goto Ebusy; | |
2173 | if (a->rsize != b->rsize) | |
2174 | goto Ebusy; | |
2175 | if (a->acregmin != b->acregmin) | |
2176 | goto Ebusy; | |
2177 | if (a->acregmax != b->acregmax) | |
2178 | goto Ebusy; | |
2179 | if (a->acdirmin != b->acdirmin) | |
2180 | goto Ebusy; | |
2181 | if (a->acdirmax != b->acdirmax) | |
2182 | goto Ebusy; | |
2183 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
2184 | goto Ebusy; | |
e89a5a43 | 2185 | return 1; |
275a5d24 | 2186 | Ebusy: |
e89a5a43 TM |
2187 | return 0; |
2188 | } | |
2189 | ||
2190 | struct nfs_sb_mountdata { | |
2191 | struct nfs_server *server; | |
2192 | int mntflags; | |
2193 | }; | |
2194 | ||
2195 | static int nfs_set_super(struct super_block *s, void *data) | |
2196 | { | |
2197 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2198 | struct nfs_server *server = sb_mntdata->server; | |
2199 | int ret; | |
2200 | ||
2201 | s->s_flags = sb_mntdata->mntflags; | |
2202 | s->s_fs_info = server; | |
2203 | ret = set_anon_super(s, server); | |
2204 | if (ret == 0) | |
2205 | server->s_dev = s->s_dev; | |
2206 | return ret; | |
2207 | } | |
2208 | ||
fd00a8ff CL |
2209 | static int nfs_compare_super_address(struct nfs_server *server1, |
2210 | struct nfs_server *server2) | |
2211 | { | |
2212 | struct sockaddr *sap1, *sap2; | |
2213 | ||
2214 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
2215 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
2216 | ||
2217 | if (sap1->sa_family != sap2->sa_family) | |
2218 | return 0; | |
2219 | ||
2220 | switch (sap1->sa_family) { | |
2221 | case AF_INET: { | |
2222 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
2223 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
2224 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
2225 | return 0; | |
2226 | if (sin1->sin_port != sin2->sin_port) | |
2227 | return 0; | |
2228 | break; | |
2229 | } | |
2230 | case AF_INET6: { | |
2231 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
2232 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
2233 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
2234 | return 0; | |
2235 | if (sin1->sin6_port != sin2->sin6_port) | |
2236 | return 0; | |
2237 | break; | |
2238 | } | |
2239 | default: | |
2240 | return 0; | |
2241 | } | |
2242 | ||
2243 | return 1; | |
2244 | } | |
2245 | ||
e89a5a43 TM |
2246 | static int nfs_compare_super(struct super_block *sb, void *data) |
2247 | { | |
2248 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2249 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
2250 | int mntflags = sb_mntdata->mntflags; | |
2251 | ||
fd00a8ff | 2252 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
2253 | return 0; |
2254 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
2255 | if (old->flags & NFS_MOUNT_UNSHARED) | |
2256 | return 0; | |
2257 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
2258 | return 0; | |
2259 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
2260 | } |
2261 | ||
fa799759 MS |
2262 | static int nfs_bdi_register(struct nfs_server *server) |
2263 | { | |
2264 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
2265 | } | |
2266 | ||
816724e6 TM |
2267 | static int nfs_get_sb(struct file_system_type *fs_type, |
2268 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 2269 | { |
f7b422b1 DH |
2270 | struct nfs_server *server = NULL; |
2271 | struct super_block *s; | |
33852a1f TM |
2272 | struct nfs_parsed_mount_data *data; |
2273 | struct nfs_fh *mntfh; | |
54ceac45 | 2274 | struct dentry *mntroot; |
75180df2 | 2275 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2276 | struct nfs_sb_mountdata sb_mntdata = { |
2277 | .mntflags = flags, | |
2278 | }; | |
33852a1f TM |
2279 | int error = -ENOMEM; |
2280 | ||
1e657bd5 | 2281 | data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); |
b157b06c | 2282 | mntfh = nfs_alloc_fhandle(); |
33852a1f TM |
2283 | if (data == NULL || mntfh == NULL) |
2284 | goto out_free_fh; | |
f7b422b1 | 2285 | |
33852a1f | 2286 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 2287 | |
54ceac45 | 2288 | /* Validate the mount data */ |
33852a1f | 2289 | error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); |
54ceac45 | 2290 | if (error < 0) |
0655960f | 2291 | goto out; |
f7b422b1 | 2292 | |
764302cc CL |
2293 | #ifdef CONFIG_NFS_V4 |
2294 | if (data->version == 4) { | |
2295 | error = nfs4_try_mount(flags, dev_name, data, mnt); | |
2296 | kfree(data->client_address); | |
9699eda6 | 2297 | kfree(data->nfs_server.export_path); |
764302cc CL |
2298 | goto out; |
2299 | } | |
2300 | #endif /* CONFIG_NFS_V4 */ | |
2301 | ||
54ceac45 | 2302 | /* Get a volume representation */ |
33852a1f | 2303 | server = nfs_create_server(data, mntfh); |
54ceac45 DH |
2304 | if (IS_ERR(server)) { |
2305 | error = PTR_ERR(server); | |
0655960f | 2306 | goto out; |
f7b422b1 | 2307 | } |
e89a5a43 | 2308 | sb_mntdata.server = server; |
f7b422b1 | 2309 | |
75180df2 TM |
2310 | if (server->flags & NFS_MOUNT_UNSHARED) |
2311 | compare_super = NULL; | |
2312 | ||
54ceac45 | 2313 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2314 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
2315 | if (IS_ERR(s)) { |
2316 | error = PTR_ERR(s); | |
54ceac45 | 2317 | goto out_err_nosb; |
816724e6 TM |
2318 | } |
2319 | ||
54ceac45 DH |
2320 | if (s->s_fs_info != server) { |
2321 | nfs_free_server(server); | |
2322 | server = NULL; | |
fa799759 MS |
2323 | } else { |
2324 | error = nfs_bdi_register(server); | |
2325 | if (error) | |
cfbc0683 | 2326 | goto error_splat_bdi; |
54ceac45 | 2327 | } |
f7b422b1 | 2328 | |
54ceac45 DH |
2329 | if (!s->s_root) { |
2330 | /* initial superblock/root creation */ | |
33852a1f | 2331 | nfs_fill_super(s, data); |
2df54806 DH |
2332 | nfs_fscache_get_super_cookie( |
2333 | s, data ? data->fscache_uniq : NULL, NULL); | |
54ceac45 | 2334 | } |
f7b422b1 | 2335 | |
33852a1f | 2336 | mntroot = nfs_get_root(s, mntfh); |
54ceac45 DH |
2337 | if (IS_ERR(mntroot)) { |
2338 | error = PTR_ERR(mntroot); | |
2339 | goto error_splat_super; | |
f7b422b1 | 2340 | } |
816724e6 | 2341 | |
33852a1f | 2342 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
f9c3a380 EP |
2343 | if (error) |
2344 | goto error_splat_root; | |
2345 | ||
54ceac45 DH |
2346 | s->s_flags |= MS_ACTIVE; |
2347 | mnt->mnt_sb = s; | |
2348 | mnt->mnt_root = mntroot; | |
0655960f CL |
2349 | error = 0; |
2350 | ||
2351 | out: | |
33852a1f TM |
2352 | kfree(data->nfs_server.hostname); |
2353 | kfree(data->mount_server.hostname); | |
08734048 | 2354 | kfree(data->fscache_uniq); |
33852a1f TM |
2355 | security_free_mnt_opts(&data->lsm_opts); |
2356 | out_free_fh: | |
b157b06c | 2357 | nfs_free_fhandle(mntfh); |
33852a1f | 2358 | kfree(data); |
0655960f | 2359 | return error; |
816724e6 | 2360 | |
54ceac45 DH |
2361 | out_err_nosb: |
2362 | nfs_free_server(server); | |
0655960f | 2363 | goto out; |
54ceac45 | 2364 | |
f9c3a380 EP |
2365 | error_splat_root: |
2366 | dput(mntroot); | |
54ceac45 | 2367 | error_splat_super: |
cfbc0683 N |
2368 | if (server && !s->s_root) |
2369 | bdi_unregister(&server->backing_dev_info); | |
2370 | error_splat_bdi: | |
6f5bbff9 | 2371 | deactivate_locked_super(s); |
0655960f | 2372 | goto out; |
f7b422b1 DH |
2373 | } |
2374 | ||
387c149b TM |
2375 | /* |
2376 | * Ensure that we unregister the bdi before kill_anon_super | |
2377 | * releases the device name | |
2378 | */ | |
2379 | static void nfs_put_super(struct super_block *s) | |
2380 | { | |
2381 | struct nfs_server *server = NFS_SB(s); | |
2382 | ||
2383 | bdi_unregister(&server->backing_dev_info); | |
2384 | } | |
2385 | ||
54ceac45 DH |
2386 | /* |
2387 | * Destroy an NFS2/3 superblock | |
2388 | */ | |
f7b422b1 DH |
2389 | static void nfs_kill_super(struct super_block *s) |
2390 | { | |
2391 | struct nfs_server *server = NFS_SB(s); | |
2392 | ||
2393 | kill_anon_super(s); | |
08734048 | 2394 | nfs_fscache_release_super_cookie(s); |
54ceac45 | 2395 | nfs_free_server(server); |
f7b422b1 DH |
2396 | } |
2397 | ||
54ceac45 DH |
2398 | /* |
2399 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2400 | */ | |
31f43471 AV |
2401 | static struct dentry * |
2402 | nfs_xdev_mount(struct file_system_type *fs_type, int flags, | |
2403 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
2404 | { |
2405 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2406 | struct super_block *s; |
2407 | struct nfs_server *server; | |
2408 | struct dentry *mntroot; | |
75180df2 | 2409 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2410 | struct nfs_sb_mountdata sb_mntdata = { |
2411 | .mntflags = flags, | |
2412 | }; | |
54ceac45 | 2413 | int error; |
f7b422b1 | 2414 | |
31f43471 | 2415 | dprintk("--> nfs_xdev_mount()\n"); |
f7b422b1 | 2416 | |
54ceac45 DH |
2417 | /* create a new volume representation */ |
2418 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2419 | if (IS_ERR(server)) { | |
2420 | error = PTR_ERR(server); | |
2421 | goto out_err_noserver; | |
2422 | } | |
e89a5a43 | 2423 | sb_mntdata.server = server; |
8fa5c000 | 2424 | |
75180df2 TM |
2425 | if (server->flags & NFS_MOUNT_UNSHARED) |
2426 | compare_super = NULL; | |
2427 | ||
54ceac45 | 2428 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2429 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2430 | if (IS_ERR(s)) { |
2431 | error = PTR_ERR(s); | |
2432 | goto out_err_nosb; | |
2433 | } | |
5006a76c | 2434 | |
54ceac45 DH |
2435 | if (s->s_fs_info != server) { |
2436 | nfs_free_server(server); | |
2437 | server = NULL; | |
fa799759 MS |
2438 | } else { |
2439 | error = nfs_bdi_register(server); | |
2440 | if (error) | |
cfbc0683 | 2441 | goto error_splat_bdi; |
f7b422b1 | 2442 | } |
24c8dbbb | 2443 | |
54ceac45 DH |
2444 | if (!s->s_root) { |
2445 | /* initial superblock/root creation */ | |
54ceac45 | 2446 | nfs_clone_super(s, data->sb); |
2df54806 | 2447 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 | 2448 | } |
f7b422b1 | 2449 | |
54ceac45 DH |
2450 | mntroot = nfs_get_root(s, data->fh); |
2451 | if (IS_ERR(mntroot)) { | |
2452 | error = PTR_ERR(mntroot); | |
2453 | goto error_splat_super; | |
f7b422b1 | 2454 | } |
e9cc6c23 | 2455 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
4c1fe2f7 NB |
2456 | dput(mntroot); |
2457 | error = -ESTALE; | |
2458 | goto error_splat_super; | |
2459 | } | |
f7b422b1 | 2460 | |
54ceac45 | 2461 | s->s_flags |= MS_ACTIVE; |
f7b422b1 | 2462 | |
f9c3a380 EP |
2463 | /* clone any lsm security options from the parent to the new sb */ |
2464 | security_sb_clone_mnt_opts(data->sb, s); | |
2465 | ||
31f43471 AV |
2466 | dprintk("<-- nfs_xdev_mount() = 0\n"); |
2467 | return mntroot; | |
24c8dbbb | 2468 | |
54ceac45 DH |
2469 | out_err_nosb: |
2470 | nfs_free_server(server); | |
2471 | out_err_noserver: | |
31f43471 AV |
2472 | dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); |
2473 | return ERR_PTR(error); | |
f7b422b1 | 2474 | |
54ceac45 | 2475 | error_splat_super: |
cfbc0683 N |
2476 | if (server && !s->s_root) |
2477 | bdi_unregister(&server->backing_dev_info); | |
2478 | error_splat_bdi: | |
6f5bbff9 | 2479 | deactivate_locked_super(s); |
31f43471 AV |
2480 | dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); |
2481 | return ERR_PTR(error); | |
f7b422b1 DH |
2482 | } |
2483 | ||
54ceac45 DH |
2484 | #ifdef CONFIG_NFS_V4 |
2485 | ||
f7b422b1 | 2486 | /* |
54ceac45 | 2487 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2488 | */ |
54ceac45 DH |
2489 | static void nfs4_clone_super(struct super_block *sb, |
2490 | const struct super_block *old_sb) | |
f7b422b1 | 2491 | { |
54ceac45 DH |
2492 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2493 | sb->s_blocksize = old_sb->s_blocksize; | |
2494 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2495 | sb->s_time_gran = 1; |
54ceac45 DH |
2496 | sb->s_op = old_sb->s_op; |
2497 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2498 | } |
2499 | ||
54ceac45 DH |
2500 | /* |
2501 | * Set up an NFS4 superblock | |
2502 | */ | |
2503 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 2504 | { |
54ceac45 DH |
2505 | sb->s_time_gran = 1; |
2506 | sb->s_op = &nfs4_sops; | |
2507 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2508 | } |
2509 | ||
01c3f052 TM |
2510 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
2511 | { | |
5eebde23 SJ |
2512 | args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
2513 | NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); | |
01c3f052 TM |
2514 | } |
2515 | ||
7630c852 CL |
2516 | static int nfs4_validate_text_mount_data(void *options, |
2517 | struct nfs_parsed_mount_data *args, | |
2518 | const char *dev_name) | |
2519 | { | |
2520 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; | |
2521 | ||
f5855fec | 2522 | nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); |
7630c852 CL |
2523 | |
2524 | nfs_validate_transport_protocol(args); | |
2525 | ||
2526 | nfs4_validate_mount_flags(args); | |
2527 | ||
2ecda72b TM |
2528 | if (args->version != 4) { |
2529 | dfprintk(MOUNT, | |
2530 | "NFS4: Illegal mount version\n"); | |
2531 | return -EINVAL; | |
2532 | } | |
2533 | ||
7630c852 CL |
2534 | if (args->auth_flavor_len > 1) { |
2535 | dfprintk(MOUNT, | |
2536 | "NFS4: Too many RPC auth flavours specified\n"); | |
2537 | return -EINVAL; | |
2538 | } | |
2539 | ||
2540 | if (args->client_address == NULL) { | |
2541 | dfprintk(MOUNT, | |
2542 | "NFS4: mount program didn't pass callback address\n"); | |
2543 | return -EINVAL; | |
2544 | } | |
2545 | ||
2546 | return nfs_parse_devname(dev_name, | |
2547 | &args->nfs_server.hostname, | |
2548 | NFS4_MAXNAMLEN, | |
2549 | &args->nfs_server.export_path, | |
2550 | NFS4_MAXPATHLEN); | |
2551 | } | |
2552 | ||
f0768ebd CL |
2553 | /* |
2554 | * Validate NFSv4 mount options | |
2555 | */ | |
91ea40b9 TT |
2556 | static int nfs4_validate_mount_data(void *options, |
2557 | struct nfs_parsed_mount_data *args, | |
2558 | const char *dev_name) | |
f0768ebd | 2559 | { |
4cfd74fc | 2560 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
91ea40b9 | 2561 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2562 | char *c; |
2563 | ||
2564 | if (data == NULL) | |
2565 | goto out_no_data; | |
2566 | ||
2567 | switch (data->version) { | |
2568 | case 1: | |
4c568017 CL |
2569 | if (data->host_addrlen > sizeof(args->nfs_server.address)) |
2570 | goto out_no_address; | |
2571 | if (data->host_addrlen == 0) | |
f0768ebd | 2572 | goto out_no_address; |
4c568017 | 2573 | args->nfs_server.addrlen = data->host_addrlen; |
4cfd74fc | 2574 | if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
f0768ebd | 2575 | return -EFAULT; |
4cfd74fc | 2576 | if (!nfs_verify_server_address(sap)) |
f0768ebd CL |
2577 | goto out_no_address; |
2578 | ||
6738b251 CL |
2579 | if (data->auth_flavourlen) { |
2580 | if (data->auth_flavourlen > 1) | |
2581 | goto out_inval_auth; | |
20c71f5e | 2582 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2583 | data->auth_flavours, |
20c71f5e | 2584 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2585 | return -EFAULT; |
f0768ebd CL |
2586 | } |
2587 | ||
2588 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2589 | if (IS_ERR(c)) | |
2590 | return PTR_ERR(c); | |
91ea40b9 | 2591 | args->nfs_server.hostname = c; |
f0768ebd CL |
2592 | |
2593 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2594 | if (IS_ERR(c)) | |
2595 | return PTR_ERR(c); | |
91ea40b9 TT |
2596 | args->nfs_server.export_path = c; |
2597 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2598 | |
2599 | c = strndup_user(data->client_addr.data, 16); | |
2600 | if (IS_ERR(c)) | |
2601 | return PTR_ERR(c); | |
91ea40b9 TT |
2602 | args->client_address = c; |
2603 | ||
2604 | /* | |
2605 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2606 | * can deal with. | |
2607 | */ | |
2608 | ||
2609 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2610 | args->rsize = data->rsize; | |
2611 | args->wsize = data->wsize; | |
2612 | args->timeo = data->timeo; | |
2613 | args->retrans = data->retrans; | |
2614 | args->acregmin = data->acregmin; | |
2615 | args->acregmax = data->acregmax; | |
2616 | args->acdirmin = data->acdirmin; | |
2617 | args->acdirmax = data->acdirmax; | |
2618 | args->nfs_server.protocol = data->proto; | |
259875ef | 2619 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2620 | |
2621 | break; | |
7630c852 | 2622 | default: |
91ea40b9 | 2623 | if (nfs_parse_mount_options((char *)options, args) == 0) |
80071225 CL |
2624 | return -EINVAL; |
2625 | ||
4cfd74fc | 2626 | if (!nfs_verify_server_address(sap)) |
80071225 | 2627 | return -EINVAL; |
dc045898 | 2628 | |
7630c852 | 2629 | return nfs4_validate_text_mount_data(options, args, dev_name); |
f0768ebd CL |
2630 | } |
2631 | ||
2632 | return 0; | |
2633 | ||
2634 | out_no_data: | |
2635 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2636 | return -EINVAL; | |
2637 | ||
2638 | out_inval_auth: | |
2639 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2640 | data->auth_flavourlen); | |
2641 | return -EINVAL; | |
2642 | ||
2643 | out_no_address: | |
2644 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2645 | return -EINVAL; | |
f0768ebd CL |
2646 | } |
2647 | ||
54ceac45 | 2648 | /* |
c02d7adf | 2649 | * Get the superblock for the NFS4 root partition |
54ceac45 | 2650 | */ |
31f43471 AV |
2651 | static struct dentry * |
2652 | nfs4_remote_mount(struct file_system_type *fs_type, int flags, | |
2653 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2654 | { |
c02d7adf | 2655 | struct nfs_parsed_mount_data *data = raw_data; |
54ceac45 DH |
2656 | struct super_block *s; |
2657 | struct nfs_server *server; | |
33852a1f | 2658 | struct nfs_fh *mntfh; |
54ceac45 | 2659 | struct dentry *mntroot; |
75180df2 | 2660 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2661 | struct nfs_sb_mountdata sb_mntdata = { |
2662 | .mntflags = flags, | |
2663 | }; | |
33852a1f TM |
2664 | int error = -ENOMEM; |
2665 | ||
b157b06c | 2666 | mntfh = nfs_alloc_fhandle(); |
33852a1f TM |
2667 | if (data == NULL || mntfh == NULL) |
2668 | goto out_free_fh; | |
f7b422b1 | 2669 | |
33852a1f | 2670 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 2671 | |
54ceac45 | 2672 | /* Get a volume representation */ |
33852a1f | 2673 | server = nfs4_create_server(data, mntfh); |
54ceac45 DH |
2674 | if (IS_ERR(server)) { |
2675 | error = PTR_ERR(server); | |
29eb981a | 2676 | goto out; |
f7b422b1 | 2677 | } |
e89a5a43 | 2678 | sb_mntdata.server = server; |
f7b422b1 | 2679 | |
75180df2 TM |
2680 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2681 | compare_super = NULL; | |
2682 | ||
54ceac45 | 2683 | /* Get a superblock - note that we may end up sharing one that already exists */ |
c02d7adf | 2684 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
2685 | if (IS_ERR(s)) { |
2686 | error = PTR_ERR(s); | |
f7b422b1 | 2687 | goto out_free; |
816724e6 TM |
2688 | } |
2689 | ||
5dd3177a TM |
2690 | if (s->s_fs_info != server) { |
2691 | nfs_free_server(server); | |
2692 | server = NULL; | |
fa799759 MS |
2693 | } else { |
2694 | error = nfs_bdi_register(server); | |
2695 | if (error) | |
cfbc0683 | 2696 | goto error_splat_bdi; |
5dd3177a TM |
2697 | } |
2698 | ||
54ceac45 DH |
2699 | if (!s->s_root) { |
2700 | /* initial superblock/root creation */ | |
54ceac45 | 2701 | nfs4_fill_super(s); |
2df54806 DH |
2702 | nfs_fscache_get_super_cookie( |
2703 | s, data ? data->fscache_uniq : NULL, NULL); | |
54ceac45 | 2704 | } |
f7b422b1 | 2705 | |
33852a1f | 2706 | mntroot = nfs4_get_root(s, mntfh); |
54ceac45 DH |
2707 | if (IS_ERR(mntroot)) { |
2708 | error = PTR_ERR(mntroot); | |
2709 | goto error_splat_super; | |
f7b422b1 | 2710 | } |
54ceac45 | 2711 | |
33852a1f | 2712 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
46c8ac74 EP |
2713 | if (error) |
2714 | goto error_splat_root; | |
2715 | ||
f7b422b1 | 2716 | s->s_flags |= MS_ACTIVE; |
31f43471 AV |
2717 | |
2718 | security_free_mnt_opts(&data->lsm_opts); | |
2719 | nfs_free_fhandle(mntfh); | |
2720 | return mntroot; | |
29eb981a CL |
2721 | |
2722 | out: | |
33852a1f TM |
2723 | security_free_mnt_opts(&data->lsm_opts); |
2724 | out_free_fh: | |
b157b06c | 2725 | nfs_free_fhandle(mntfh); |
31f43471 | 2726 | return ERR_PTR(error); |
54ceac45 | 2727 | |
f7b422b1 | 2728 | out_free: |
54ceac45 | 2729 | nfs_free_server(server); |
29eb981a | 2730 | goto out; |
54ceac45 | 2731 | |
46c8ac74 EP |
2732 | error_splat_root: |
2733 | dput(mntroot); | |
54ceac45 | 2734 | error_splat_super: |
cfbc0683 N |
2735 | if (server && !s->s_root) |
2736 | bdi_unregister(&server->backing_dev_info); | |
2737 | error_splat_bdi: | |
6f5bbff9 | 2738 | deactivate_locked_super(s); |
29eb981a | 2739 | goto out; |
f7b422b1 DH |
2740 | } |
2741 | ||
c02d7adf TM |
2742 | static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
2743 | int flags, void *data, const char *hostname) | |
2744 | { | |
2745 | struct vfsmount *root_mnt; | |
2746 | char *root_devname; | |
2747 | size_t len; | |
2748 | ||
2749 | len = strlen(hostname) + 3; | |
2750 | root_devname = kmalloc(len, GFP_KERNEL); | |
2751 | if (root_devname == NULL) | |
2752 | return ERR_PTR(-ENOMEM); | |
2753 | snprintf(root_devname, len, "%s:/", hostname); | |
2754 | root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); | |
2755 | kfree(root_devname); | |
2756 | return root_mnt; | |
2757 | } | |
2758 | ||
b88f8a54 TM |
2759 | static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) |
2760 | { | |
2761 | char *page = (char *) __get_free_page(GFP_KERNEL); | |
2762 | char *devname, *tmp; | |
2763 | ||
2764 | if (page == NULL) | |
2765 | return; | |
2766 | devname = nfs_path(path->mnt->mnt_devname, | |
2767 | path->mnt->mnt_root, path->dentry, | |
2768 | page, PAGE_SIZE); | |
cdd29ecf | 2769 | if (IS_ERR(devname)) |
b88f8a54 TM |
2770 | goto out_freepage; |
2771 | tmp = kstrdup(devname, GFP_KERNEL); | |
2772 | if (tmp == NULL) | |
2773 | goto out_freepage; | |
2774 | kfree(mnt->mnt_devname); | |
2775 | mnt->mnt_devname = tmp; | |
2776 | out_freepage: | |
2777 | free_page((unsigned long)page); | |
2778 | } | |
2779 | ||
ce587e07 TM |
2780 | struct nfs_referral_count { |
2781 | struct list_head list; | |
2782 | const struct task_struct *task; | |
2783 | unsigned int referral_count; | |
2784 | }; | |
2785 | ||
2786 | static LIST_HEAD(nfs_referral_count_list); | |
2787 | static DEFINE_SPINLOCK(nfs_referral_count_list_lock); | |
2788 | ||
2789 | static struct nfs_referral_count *nfs_find_referral_count(void) | |
2790 | { | |
2791 | struct nfs_referral_count *p; | |
2792 | ||
2793 | list_for_each_entry(p, &nfs_referral_count_list, list) { | |
2794 | if (p->task == current) | |
2795 | return p; | |
2796 | } | |
2797 | return NULL; | |
2798 | } | |
2799 | ||
2800 | #define NFS_MAX_NESTED_REFERRALS 2 | |
2801 | ||
2802 | static int nfs_referral_loop_protect(void) | |
2803 | { | |
2804 | struct nfs_referral_count *p, *new; | |
2805 | int ret = -ENOMEM; | |
2806 | ||
2807 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2808 | if (!new) | |
2809 | goto out; | |
2810 | new->task = current; | |
2811 | new->referral_count = 1; | |
2812 | ||
2813 | ret = 0; | |
2814 | spin_lock(&nfs_referral_count_list_lock); | |
2815 | p = nfs_find_referral_count(); | |
2816 | if (p != NULL) { | |
2817 | if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) | |
2818 | ret = -ELOOP; | |
2819 | else | |
2820 | p->referral_count++; | |
2821 | } else { | |
2822 | list_add(&new->list, &nfs_referral_count_list); | |
2823 | new = NULL; | |
2824 | } | |
2825 | spin_unlock(&nfs_referral_count_list_lock); | |
2826 | kfree(new); | |
2827 | out: | |
2828 | return ret; | |
2829 | } | |
2830 | ||
2831 | static void nfs_referral_loop_unprotect(void) | |
2832 | { | |
2833 | struct nfs_referral_count *p; | |
2834 | ||
2835 | spin_lock(&nfs_referral_count_list_lock); | |
2836 | p = nfs_find_referral_count(); | |
2837 | p->referral_count--; | |
2838 | if (p->referral_count == 0) | |
2839 | list_del(&p->list); | |
2840 | else | |
2841 | p = NULL; | |
2842 | spin_unlock(&nfs_referral_count_list_lock); | |
2843 | kfree(p); | |
2844 | } | |
2845 | ||
c02d7adf TM |
2846 | static int nfs_follow_remote_path(struct vfsmount *root_mnt, |
2847 | const char *export_path, struct vfsmount *mnt_target) | |
2848 | { | |
04ffdbe2 | 2849 | struct nameidata *nd = NULL; |
a2770d86 | 2850 | struct mnt_namespace *ns_private; |
c02d7adf TM |
2851 | struct super_block *s; |
2852 | int ret; | |
2853 | ||
04ffdbe2 TM |
2854 | nd = kmalloc(sizeof(*nd), GFP_KERNEL); |
2855 | if (nd == NULL) | |
2856 | return -ENOMEM; | |
2857 | ||
a2770d86 LT |
2858 | ns_private = create_mnt_ns(root_mnt); |
2859 | ret = PTR_ERR(ns_private); | |
2860 | if (IS_ERR(ns_private)) | |
2861 | goto out_mntput; | |
2862 | ||
ce587e07 TM |
2863 | ret = nfs_referral_loop_protect(); |
2864 | if (ret != 0) | |
2865 | goto out_put_mnt_ns; | |
2866 | ||
c02d7adf | 2867 | ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, |
04ffdbe2 | 2868 | export_path, LOOKUP_FOLLOW, nd); |
c02d7adf | 2869 | |
ce587e07 | 2870 | nfs_referral_loop_unprotect(); |
a2770d86 LT |
2871 | put_mnt_ns(ns_private); |
2872 | ||
c02d7adf TM |
2873 | if (ret != 0) |
2874 | goto out_err; | |
2875 | ||
04ffdbe2 | 2876 | s = nd->path.mnt->mnt_sb; |
c02d7adf TM |
2877 | atomic_inc(&s->s_active); |
2878 | mnt_target->mnt_sb = s; | |
04ffdbe2 | 2879 | mnt_target->mnt_root = dget(nd->path.dentry); |
c02d7adf | 2880 | |
b88f8a54 | 2881 | /* Correct the device pathname */ |
04ffdbe2 | 2882 | nfs_fix_devname(&nd->path, mnt_target); |
b88f8a54 | 2883 | |
04ffdbe2 TM |
2884 | path_put(&nd->path); |
2885 | kfree(nd); | |
c02d7adf TM |
2886 | down_write(&s->s_umount); |
2887 | return 0; | |
ce587e07 TM |
2888 | out_put_mnt_ns: |
2889 | put_mnt_ns(ns_private); | |
c02d7adf TM |
2890 | out_mntput: |
2891 | mntput(root_mnt); | |
2892 | out_err: | |
04ffdbe2 | 2893 | kfree(nd); |
c02d7adf TM |
2894 | return ret; |
2895 | } | |
2896 | ||
a6fe23be CL |
2897 | static int nfs4_try_mount(int flags, const char *dev_name, |
2898 | struct nfs_parsed_mount_data *data, | |
2899 | struct vfsmount *mnt) | |
2900 | { | |
2901 | char *export_path; | |
2902 | struct vfsmount *root_mnt; | |
2903 | int error; | |
2904 | ||
2905 | dfprintk(MOUNT, "--> nfs4_try_mount()\n"); | |
2906 | ||
2907 | export_path = data->nfs_server.export_path; | |
2908 | data->nfs_server.export_path = "/"; | |
2909 | root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, | |
2910 | data->nfs_server.hostname); | |
2911 | data->nfs_server.export_path = export_path; | |
2912 | ||
2913 | error = PTR_ERR(root_mnt); | |
2914 | if (IS_ERR(root_mnt)) | |
2915 | goto out; | |
2916 | ||
2917 | error = nfs_follow_remote_path(root_mnt, export_path, mnt); | |
2918 | ||
2919 | out: | |
2920 | dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, | |
2921 | error != 0 ? " [error]" : ""); | |
2922 | return error; | |
2923 | } | |
2924 | ||
c02d7adf TM |
2925 | /* |
2926 | * Get the superblock for an NFS4 mountpoint | |
2927 | */ | |
2928 | static int nfs4_get_sb(struct file_system_type *fs_type, | |
2929 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
2930 | { | |
2931 | struct nfs_parsed_mount_data *data; | |
c02d7adf TM |
2932 | int error = -ENOMEM; |
2933 | ||
c5811dbd | 2934 | data = nfs_alloc_parsed_mount_data(4); |
c02d7adf TM |
2935 | if (data == NULL) |
2936 | goto out_free_data; | |
2937 | ||
2938 | /* Validate the mount data */ | |
2939 | error = nfs4_validate_mount_data(raw_data, data, dev_name); | |
2940 | if (error < 0) | |
2941 | goto out; | |
2942 | ||
a6fe23be | 2943 | error = nfs4_try_mount(flags, dev_name, data, mnt); |
c02d7adf TM |
2944 | |
2945 | out: | |
2946 | kfree(data->client_address); | |
2947 | kfree(data->nfs_server.export_path); | |
2948 | kfree(data->nfs_server.hostname); | |
2949 | kfree(data->fscache_uniq); | |
2950 | out_free_data: | |
2951 | kfree(data); | |
2952 | dprintk("<-- nfs4_get_sb() = %d%s\n", error, | |
2953 | error != 0 ? " [error]" : ""); | |
2954 | return error; | |
2955 | } | |
2956 | ||
f7b422b1 DH |
2957 | static void nfs4_kill_super(struct super_block *sb) |
2958 | { | |
2959 | struct nfs_server *server = NFS_SB(sb); | |
2960 | ||
0f3e66c6 | 2961 | dprintk("--> %s\n", __func__); |
515d8611 | 2962 | nfs_super_return_all_delegations(sb); |
f7b422b1 | 2963 | kill_anon_super(sb); |
08734048 | 2964 | nfs_fscache_release_super_cookie(sb); |
54ceac45 | 2965 | nfs_free_server(server); |
0f3e66c6 | 2966 | dprintk("<-- %s\n", __func__); |
f7b422b1 DH |
2967 | } |
2968 | ||
2969 | /* | |
54ceac45 | 2970 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2971 | */ |
31f43471 AV |
2972 | static struct dentry * |
2973 | nfs4_xdev_mount(struct file_system_type *fs_type, int flags, | |
2974 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2975 | { |
54ceac45 DH |
2976 | struct nfs_clone_mount *data = raw_data; |
2977 | struct super_block *s; | |
2978 | struct nfs_server *server; | |
2979 | struct dentry *mntroot; | |
75180df2 | 2980 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2981 | struct nfs_sb_mountdata sb_mntdata = { |
2982 | .mntflags = flags, | |
2983 | }; | |
54ceac45 | 2984 | int error; |
f7b422b1 | 2985 | |
31f43471 | 2986 | dprintk("--> nfs4_xdev_mount()\n"); |
f7b422b1 | 2987 | |
54ceac45 DH |
2988 | /* create a new volume representation */ |
2989 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2990 | if (IS_ERR(server)) { | |
2991 | error = PTR_ERR(server); | |
2992 | goto out_err_noserver; | |
f7b422b1 | 2993 | } |
e89a5a43 | 2994 | sb_mntdata.server = server; |
f7b422b1 | 2995 | |
75180df2 TM |
2996 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2997 | compare_super = NULL; | |
2998 | ||
54ceac45 | 2999 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 3000 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
3001 | if (IS_ERR(s)) { |
3002 | error = PTR_ERR(s); | |
3003 | goto out_err_nosb; | |
f7b422b1 | 3004 | } |
f7b422b1 | 3005 | |
54ceac45 DH |
3006 | if (s->s_fs_info != server) { |
3007 | nfs_free_server(server); | |
3008 | server = NULL; | |
fa799759 MS |
3009 | } else { |
3010 | error = nfs_bdi_register(server); | |
3011 | if (error) | |
cfbc0683 | 3012 | goto error_splat_bdi; |
54ceac45 | 3013 | } |
f7b422b1 | 3014 | |
54ceac45 DH |
3015 | if (!s->s_root) { |
3016 | /* initial superblock/root creation */ | |
54ceac45 | 3017 | nfs4_clone_super(s, data->sb); |
2df54806 | 3018 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 | 3019 | } |
f7b422b1 | 3020 | |
54ceac45 DH |
3021 | mntroot = nfs4_get_root(s, data->fh); |
3022 | if (IS_ERR(mntroot)) { | |
3023 | error = PTR_ERR(mntroot); | |
3024 | goto error_splat_super; | |
3025 | } | |
e9cc6c23 TM |
3026 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
3027 | dput(mntroot); | |
3028 | error = -ESTALE; | |
3029 | goto error_splat_super; | |
3030 | } | |
f7b422b1 | 3031 | |
54ceac45 | 3032 | s->s_flags |= MS_ACTIVE; |
54ceac45 | 3033 | |
46c8ac74 EP |
3034 | security_sb_clone_mnt_opts(data->sb, s); |
3035 | ||
31f43471 AV |
3036 | dprintk("<-- nfs4_xdev_mount() = 0\n"); |
3037 | return mntroot; | |
54ceac45 DH |
3038 | |
3039 | out_err_nosb: | |
3040 | nfs_free_server(server); | |
3041 | out_err_noserver: | |
31f43471 AV |
3042 | dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); |
3043 | return ERR_PTR(error); | |
54ceac45 DH |
3044 | |
3045 | error_splat_super: | |
cfbc0683 N |
3046 | if (server && !s->s_root) |
3047 | bdi_unregister(&server->backing_dev_info); | |
3048 | error_splat_bdi: | |
6f5bbff9 | 3049 | deactivate_locked_super(s); |
31f43471 AV |
3050 | dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); |
3051 | return ERR_PTR(error); | |
f7b422b1 DH |
3052 | } |
3053 | ||
31f43471 AV |
3054 | static struct dentry * |
3055 | nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, | |
3056 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
3057 | { |
3058 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
3059 | struct super_block *s; |
3060 | struct nfs_server *server; | |
3061 | struct dentry *mntroot; | |
4f727296 | 3062 | struct nfs_fh *mntfh; |
75180df2 | 3063 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
3064 | struct nfs_sb_mountdata sb_mntdata = { |
3065 | .mntflags = flags, | |
3066 | }; | |
4f727296 | 3067 | int error = -ENOMEM; |
54ceac45 DH |
3068 | |
3069 | dprintk("--> nfs4_referral_get_sb()\n"); | |
3070 | ||
4f727296 TM |
3071 | mntfh = nfs_alloc_fhandle(); |
3072 | if (mntfh == NULL) | |
3073 | goto out_err_nofh; | |
3074 | ||
54ceac45 | 3075 | /* create a new volume representation */ |
4f727296 | 3076 | server = nfs4_create_referral_server(data, mntfh); |
54ceac45 DH |
3077 | if (IS_ERR(server)) { |
3078 | error = PTR_ERR(server); | |
3079 | goto out_err_noserver; | |
3080 | } | |
e89a5a43 | 3081 | sb_mntdata.server = server; |
54ceac45 | 3082 | |
75180df2 TM |
3083 | if (server->flags & NFS4_MOUNT_UNSHARED) |
3084 | compare_super = NULL; | |
3085 | ||
54ceac45 | 3086 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 3087 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
3088 | if (IS_ERR(s)) { |
3089 | error = PTR_ERR(s); | |
3090 | goto out_err_nosb; | |
3091 | } | |
3092 | ||
3093 | if (s->s_fs_info != server) { | |
3094 | nfs_free_server(server); | |
3095 | server = NULL; | |
fa799759 MS |
3096 | } else { |
3097 | error = nfs_bdi_register(server); | |
3098 | if (error) | |
cfbc0683 | 3099 | goto error_splat_bdi; |
54ceac45 DH |
3100 | } |
3101 | ||
3102 | if (!s->s_root) { | |
3103 | /* initial superblock/root creation */ | |
54ceac45 | 3104 | nfs4_fill_super(s); |
2df54806 | 3105 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 DH |
3106 | } |
3107 | ||
4f727296 | 3108 | mntroot = nfs4_get_root(s, mntfh); |
54ceac45 DH |
3109 | if (IS_ERR(mntroot)) { |
3110 | error = PTR_ERR(mntroot); | |
3111 | goto error_splat_super; | |
3112 | } | |
e9cc6c23 TM |
3113 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
3114 | dput(mntroot); | |
3115 | error = -ESTALE; | |
3116 | goto error_splat_super; | |
3117 | } | |
54ceac45 DH |
3118 | |
3119 | s->s_flags |= MS_ACTIVE; | |
54ceac45 | 3120 | |
46c8ac74 EP |
3121 | security_sb_clone_mnt_opts(data->sb, s); |
3122 | ||
4f727296 | 3123 | nfs_free_fhandle(mntfh); |
54ceac45 | 3124 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); |
31f43471 | 3125 | return mntroot; |
54ceac45 DH |
3126 | |
3127 | out_err_nosb: | |
3128 | nfs_free_server(server); | |
3129 | out_err_noserver: | |
4f727296 TM |
3130 | nfs_free_fhandle(mntfh); |
3131 | out_err_nofh: | |
54ceac45 | 3132 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); |
31f43471 | 3133 | return ERR_PTR(error); |
54ceac45 DH |
3134 | |
3135 | error_splat_super: | |
cfbc0683 N |
3136 | if (server && !s->s_root) |
3137 | bdi_unregister(&server->backing_dev_info); | |
3138 | error_splat_bdi: | |
6f5bbff9 | 3139 | deactivate_locked_super(s); |
4f727296 | 3140 | nfs_free_fhandle(mntfh); |
54ceac45 | 3141 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); |
31f43471 | 3142 | return ERR_PTR(error); |
f7b422b1 DH |
3143 | } |
3144 | ||
c02d7adf TM |
3145 | /* |
3146 | * Create an NFS4 server record on referral traversal | |
3147 | */ | |
3148 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, | |
3149 | int flags, const char *dev_name, void *raw_data, | |
3150 | struct vfsmount *mnt) | |
3151 | { | |
3152 | struct nfs_clone_mount *data = raw_data; | |
3153 | char *export_path; | |
3154 | struct vfsmount *root_mnt; | |
3155 | int error; | |
3156 | ||
3157 | dprintk("--> nfs4_referral_get_sb()\n"); | |
3158 | ||
3159 | export_path = data->mnt_path; | |
3160 | data->mnt_path = "/"; | |
3161 | ||
3162 | root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, | |
3163 | flags, data, data->hostname); | |
3164 | data->mnt_path = export_path; | |
3165 | ||
3166 | error = PTR_ERR(root_mnt); | |
3167 | if (IS_ERR(root_mnt)) | |
3168 | goto out; | |
3169 | ||
3170 | error = nfs_follow_remote_path(root_mnt, export_path, mnt); | |
3171 | out: | |
3172 | dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, | |
3173 | error != 0 ? " [error]" : ""); | |
3174 | return error; | |
3175 | } | |
3176 | ||
54ceac45 | 3177 | #endif /* CONFIG_NFS_V4 */ |