Commit | Line | Data |
---|---|---|
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" |
ae50c0b5 | 66 | #include "pnfs.h" |
f7b422b1 DH |
67 | |
68 | #define NFSDBG_FACILITY NFSDBG_VFS | |
69 | ||
1e657bd5 PZ |
70 | #ifdef CONFIG_NFS_V3 |
71 | #define NFS_DEFAULT_VERSION 3 | |
72 | #else | |
73 | #define NFS_DEFAULT_VERSION 2 | |
74 | #endif | |
75 | ||
bf0fd768 CL |
76 | enum { |
77 | /* Mount options that take no arguments */ | |
78 | Opt_soft, Opt_hard, | |
bf0fd768 CL |
79 | Opt_posix, Opt_noposix, |
80 | Opt_cto, Opt_nocto, | |
81 | Opt_ac, Opt_noac, | |
82 | Opt_lock, Opt_nolock, | |
764302cc | 83 | Opt_v2, Opt_v3, Opt_v4, |
2cf7ff7a | 84 | Opt_udp, Opt_tcp, Opt_rdma, |
bf0fd768 CL |
85 | Opt_acl, Opt_noacl, |
86 | Opt_rdirplus, Opt_nordirplus, | |
75180df2 | 87 | Opt_sharecache, Opt_nosharecache, |
d740351b | 88 | Opt_resvport, Opt_noresvport, |
b797cac7 | 89 | Opt_fscache, Opt_nofscache, |
bf0fd768 CL |
90 | |
91 | /* Mount options that take integer arguments */ | |
92 | Opt_port, | |
93 | Opt_rsize, Opt_wsize, Opt_bsize, | |
94 | Opt_timeo, Opt_retrans, | |
95 | Opt_acregmin, Opt_acregmax, | |
96 | Opt_acdirmin, Opt_acdirmax, | |
97 | Opt_actimeo, | |
98 | Opt_namelen, | |
99 | Opt_mountport, | |
e887cbcf | 100 | Opt_mountvers, |
ad879cef | 101 | Opt_nfsvers, |
3fd5be9e | 102 | Opt_minorversion, |
bf0fd768 CL |
103 | |
104 | /* Mount options that take string arguments */ | |
33832034 | 105 | Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, |
0ac83779 | 106 | Opt_addr, Opt_mountaddr, Opt_clientaddr, |
7973c1f1 | 107 | Opt_lookupcache, |
b797cac7 | 108 | Opt_fscache_uniq, |
5eebde23 | 109 | Opt_local_lock, |
bf0fd768 | 110 | |
f45663ce CL |
111 | /* Special mount options */ |
112 | Opt_userspace, Opt_deprecated, Opt_sloppy, | |
bf0fd768 CL |
113 | |
114 | Opt_err | |
115 | }; | |
116 | ||
a447c093 | 117 | static const match_table_t nfs_mount_option_tokens = { |
bf0fd768 CL |
118 | { Opt_userspace, "bg" }, |
119 | { Opt_userspace, "fg" }, | |
ecbb3845 CL |
120 | { Opt_userspace, "retry=%s" }, |
121 | ||
f45663ce CL |
122 | { Opt_sloppy, "sloppy" }, |
123 | ||
bf0fd768 CL |
124 | { Opt_soft, "soft" }, |
125 | { Opt_hard, "hard" }, | |
d33e4dfe CL |
126 | { Opt_deprecated, "intr" }, |
127 | { Opt_deprecated, "nointr" }, | |
bf0fd768 CL |
128 | { Opt_posix, "posix" }, |
129 | { Opt_noposix, "noposix" }, | |
130 | { Opt_cto, "cto" }, | |
131 | { Opt_nocto, "nocto" }, | |
132 | { Opt_ac, "ac" }, | |
133 | { Opt_noac, "noac" }, | |
134 | { Opt_lock, "lock" }, | |
135 | { Opt_nolock, "nolock" }, | |
136 | { Opt_v2, "v2" }, | |
137 | { Opt_v3, "v3" }, | |
764302cc | 138 | { Opt_v4, "v4" }, |
bf0fd768 CL |
139 | { Opt_udp, "udp" }, |
140 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 141 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
142 | { Opt_acl, "acl" }, |
143 | { Opt_noacl, "noacl" }, | |
144 | { Opt_rdirplus, "rdirplus" }, | |
145 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
146 | { Opt_sharecache, "sharecache" }, |
147 | { Opt_nosharecache, "nosharecache" }, | |
d740351b CL |
148 | { Opt_resvport, "resvport" }, |
149 | { Opt_noresvport, "noresvport" }, | |
b797cac7 | 150 | { Opt_fscache, "fsc" }, |
b797cac7 | 151 | { Opt_nofscache, "nofsc" }, |
bf0fd768 | 152 | |
a5a16bae CL |
153 | { Opt_port, "port=%s" }, |
154 | { Opt_rsize, "rsize=%s" }, | |
155 | { Opt_wsize, "wsize=%s" }, | |
156 | { Opt_bsize, "bsize=%s" }, | |
157 | { Opt_timeo, "timeo=%s" }, | |
158 | { Opt_retrans, "retrans=%s" }, | |
159 | { Opt_acregmin, "acregmin=%s" }, | |
160 | { Opt_acregmax, "acregmax=%s" }, | |
161 | { Opt_acdirmin, "acdirmin=%s" }, | |
162 | { Opt_acdirmax, "acdirmax=%s" }, | |
163 | { Opt_actimeo, "actimeo=%s" }, | |
164 | { Opt_namelen, "namlen=%s" }, | |
165 | { Opt_mountport, "mountport=%s" }, | |
166 | { Opt_mountvers, "mountvers=%s" }, | |
167 | { Opt_nfsvers, "nfsvers=%s" }, | |
168 | { Opt_nfsvers, "vers=%s" }, | |
f3f4f4ed | 169 | { Opt_minorversion, "minorversion=%s" }, |
bf0fd768 CL |
170 | |
171 | { Opt_sec, "sec=%s" }, | |
172 | { Opt_proto, "proto=%s" }, | |
173 | { Opt_mountproto, "mountproto=%s" }, | |
174 | { Opt_addr, "addr=%s" }, | |
175 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 176 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 177 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 | 178 | |
7973c1f1 | 179 | { Opt_lookupcache, "lookupcache=%s" }, |
a6d5ff64 | 180 | { Opt_fscache_uniq, "fsc=%s" }, |
5eebde23 | 181 | { Opt_local_lock, "local_lock=%s" }, |
7973c1f1 | 182 | |
bf0fd768 CL |
183 | { Opt_err, NULL } |
184 | }; | |
185 | ||
186 | enum { | |
ee671b01 | 187 | Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, |
bf0fd768 CL |
188 | |
189 | Opt_xprt_err | |
190 | }; | |
191 | ||
a447c093 | 192 | static const match_table_t nfs_xprt_protocol_tokens = { |
bf0fd768 | 193 | { Opt_xprt_udp, "udp" }, |
ee671b01 | 194 | { Opt_xprt_udp6, "udp6" }, |
bf0fd768 | 195 | { Opt_xprt_tcp, "tcp" }, |
ee671b01 | 196 | { Opt_xprt_tcp6, "tcp6" }, |
2cf7ff7a | 197 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
198 | |
199 | { Opt_xprt_err, NULL } | |
200 | }; | |
201 | ||
202 | enum { | |
203 | Opt_sec_none, Opt_sec_sys, | |
204 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
205 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
206 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
207 | ||
208 | Opt_sec_err | |
209 | }; | |
210 | ||
a447c093 | 211 | static const match_table_t nfs_secflavor_tokens = { |
bf0fd768 CL |
212 | { Opt_sec_none, "none" }, |
213 | { Opt_sec_none, "null" }, | |
214 | { Opt_sec_sys, "sys" }, | |
215 | ||
216 | { Opt_sec_krb5, "krb5" }, | |
217 | { Opt_sec_krb5i, "krb5i" }, | |
218 | { Opt_sec_krb5p, "krb5p" }, | |
219 | ||
220 | { Opt_sec_lkey, "lkey" }, | |
221 | { Opt_sec_lkeyi, "lkeyi" }, | |
222 | { Opt_sec_lkeyp, "lkeyp" }, | |
223 | ||
8d042218 OK |
224 | { Opt_sec_spkm, "spkm3" }, |
225 | { Opt_sec_spkmi, "spkm3i" }, | |
226 | { Opt_sec_spkmp, "spkm3p" }, | |
227 | ||
bf0fd768 CL |
228 | { Opt_sec_err, NULL } |
229 | }; | |
230 | ||
7973c1f1 TM |
231 | enum { |
232 | Opt_lookupcache_all, Opt_lookupcache_positive, | |
233 | Opt_lookupcache_none, | |
234 | ||
235 | Opt_lookupcache_err | |
236 | }; | |
237 | ||
238 | static match_table_t nfs_lookupcache_tokens = { | |
239 | { Opt_lookupcache_all, "all" }, | |
240 | { Opt_lookupcache_positive, "pos" }, | |
241 | { Opt_lookupcache_positive, "positive" }, | |
242 | { Opt_lookupcache_none, "none" }, | |
243 | ||
244 | { Opt_lookupcache_err, NULL } | |
245 | }; | |
246 | ||
5eebde23 SJ |
247 | enum { |
248 | Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, | |
249 | Opt_local_lock_none, | |
250 | ||
251 | Opt_local_lock_err | |
252 | }; | |
253 | ||
254 | static match_table_t nfs_local_lock_tokens = { | |
255 | { Opt_local_lock_all, "all" }, | |
256 | { Opt_local_lock_flock, "flock" }, | |
257 | { Opt_local_lock_posix, "posix" }, | |
258 | { Opt_local_lock_none, "none" }, | |
259 | ||
260 | { Opt_local_lock_err, NULL } | |
261 | }; | |
262 | ||
bf0fd768 | 263 | |
42faad99 | 264 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 265 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 | 266 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
c7f404b4 AV |
267 | static int nfs_show_devname(struct seq_file *, struct vfsmount *); |
268 | static int nfs_show_path(struct seq_file *, struct vfsmount *); | |
f7b422b1 | 269 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); |
01194981 AV |
270 | static struct dentry *nfs_fs_mount(struct file_system_type *, |
271 | int, const char *, void *); | |
31f43471 AV |
272 | static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, |
273 | int flags, const char *dev_name, void *raw_data); | |
387c149b | 274 | static void nfs_put_super(struct super_block *); |
f7b422b1 | 275 | static void nfs_kill_super(struct super_block *); |
48b605f8 | 276 | static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); |
f7b422b1 DH |
277 | |
278 | static struct file_system_type nfs_fs_type = { | |
279 | .owner = THIS_MODULE, | |
280 | .name = "nfs", | |
01194981 | 281 | .mount = nfs_fs_mount, |
f7b422b1 | 282 | .kill_sb = nfs_kill_super, |
349457cc | 283 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
284 | }; |
285 | ||
54ceac45 | 286 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
287 | .owner = THIS_MODULE, |
288 | .name = "nfs", | |
31f43471 | 289 | .mount = nfs_xdev_mount, |
f7b422b1 | 290 | .kill_sb = nfs_kill_super, |
349457cc | 291 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
292 | }; |
293 | ||
ee9b6d61 | 294 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
295 | .alloc_inode = nfs_alloc_inode, |
296 | .destroy_inode = nfs_destroy_inode, | |
297 | .write_inode = nfs_write_inode, | |
387c149b | 298 | .put_super = nfs_put_super, |
f7b422b1 | 299 | .statfs = nfs_statfs, |
b57922d9 | 300 | .evict_inode = nfs_evict_inode, |
f7b422b1 DH |
301 | .umount_begin = nfs_umount_begin, |
302 | .show_options = nfs_show_options, | |
c7f404b4 AV |
303 | .show_devname = nfs_show_devname, |
304 | .show_path = nfs_show_path, | |
f7b422b1 | 305 | .show_stats = nfs_show_stats, |
48b605f8 | 306 | .remount_fs = nfs_remount, |
f7b422b1 DH |
307 | }; |
308 | ||
309 | #ifdef CONFIG_NFS_V4 | |
7630c852 CL |
310 | static int nfs4_validate_text_mount_data(void *options, |
311 | struct nfs_parsed_mount_data *args, const char *dev_name); | |
01194981 AV |
312 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
313 | struct nfs_parsed_mount_data *data); | |
314 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, | |
315 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
316 | static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
317 | int flags, const char *dev_name, void *raw_data); | |
318 | static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, | |
319 | int flags, const char *dev_name, void *raw_data); | |
01194981 AV |
320 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
321 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
322 | static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
323 | int flags, const char *dev_name, void *raw_data); | |
f7b422b1 DH |
324 | static void nfs4_kill_super(struct super_block *sb); |
325 | ||
326 | static struct file_system_type nfs4_fs_type = { | |
327 | .owner = THIS_MODULE, | |
328 | .name = "nfs4", | |
01194981 | 329 | .mount = nfs4_mount, |
f7b422b1 | 330 | .kill_sb = nfs4_kill_super, |
349457cc | 331 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
332 | }; |
333 | ||
c02d7adf TM |
334 | static struct file_system_type nfs4_remote_fs_type = { |
335 | .owner = THIS_MODULE, | |
336 | .name = "nfs4", | |
31f43471 | 337 | .mount = nfs4_remote_mount, |
c02d7adf TM |
338 | .kill_sb = nfs4_kill_super, |
339 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
340 | }; | |
341 | ||
54ceac45 | 342 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
343 | .owner = THIS_MODULE, |
344 | .name = "nfs4", | |
31f43471 | 345 | .mount = nfs4_xdev_mount, |
f7b422b1 | 346 | .kill_sb = nfs4_kill_super, |
349457cc | 347 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
348 | }; |
349 | ||
c02d7adf TM |
350 | static struct file_system_type nfs4_remote_referral_fs_type = { |
351 | .owner = THIS_MODULE, | |
352 | .name = "nfs4", | |
31f43471 | 353 | .mount = nfs4_remote_referral_mount, |
c02d7adf TM |
354 | .kill_sb = nfs4_kill_super, |
355 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
356 | }; | |
357 | ||
54ceac45 | 358 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
359 | .owner = THIS_MODULE, |
360 | .name = "nfs4", | |
01194981 | 361 | .mount = nfs4_referral_mount, |
f7b422b1 | 362 | .kill_sb = nfs4_kill_super, |
349457cc | 363 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
364 | }; |
365 | ||
ee9b6d61 | 366 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
367 | .alloc_inode = nfs_alloc_inode, |
368 | .destroy_inode = nfs_destroy_inode, | |
369 | .write_inode = nfs_write_inode, | |
387c149b | 370 | .put_super = nfs_put_super, |
f7b422b1 | 371 | .statfs = nfs_statfs, |
b57922d9 | 372 | .evict_inode = nfs4_evict_inode, |
f7b422b1 DH |
373 | .umount_begin = nfs_umount_begin, |
374 | .show_options = nfs_show_options, | |
c7f404b4 AV |
375 | .show_devname = nfs_show_devname, |
376 | .show_path = nfs_show_path, | |
f7b422b1 | 377 | .show_stats = nfs_show_stats, |
48b605f8 | 378 | .remount_fs = nfs_remount, |
f7b422b1 DH |
379 | }; |
380 | #endif | |
381 | ||
8e1f936b RR |
382 | static struct shrinker acl_shrinker = { |
383 | .shrink = nfs_access_cache_shrinker, | |
384 | .seeks = DEFAULT_SEEKS, | |
385 | }; | |
979df72e | 386 | |
f7b422b1 DH |
387 | /* |
388 | * Register the NFS filesystems | |
389 | */ | |
390 | int __init register_nfs_fs(void) | |
391 | { | |
392 | int ret; | |
393 | ||
394 | ret = register_filesystem(&nfs_fs_type); | |
395 | if (ret < 0) | |
396 | goto error_0; | |
397 | ||
f7b422b1 DH |
398 | ret = nfs_register_sysctl(); |
399 | if (ret < 0) | |
400 | goto error_1; | |
89a09141 | 401 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
402 | ret = register_filesystem(&nfs4_fs_type); |
403 | if (ret < 0) | |
404 | goto error_2; | |
405 | #endif | |
8e1f936b | 406 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
407 | return 0; |
408 | ||
409 | #ifdef CONFIG_NFS_V4 | |
410 | error_2: | |
411 | nfs_unregister_sysctl(); | |
89a09141 | 412 | #endif |
f7b422b1 DH |
413 | error_1: |
414 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
415 | error_0: |
416 | return ret; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Unregister the NFS filesystems | |
421 | */ | |
422 | void __exit unregister_nfs_fs(void) | |
423 | { | |
8e1f936b | 424 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
425 | #ifdef CONFIG_NFS_V4 |
426 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 427 | #endif |
49af7ee1 | 428 | nfs_unregister_sysctl(); |
f7b422b1 DH |
429 | unregister_filesystem(&nfs_fs_type); |
430 | } | |
431 | ||
1daef0a8 | 432 | void nfs_sb_active(struct super_block *sb) |
ef818a28 | 433 | { |
1daef0a8 | 434 | struct nfs_server *server = NFS_SB(sb); |
ef818a28 | 435 | |
1daef0a8 TM |
436 | if (atomic_inc_return(&server->active) == 1) |
437 | atomic_inc(&sb->s_active); | |
ef818a28 SD |
438 | } |
439 | ||
1daef0a8 | 440 | void nfs_sb_deactive(struct super_block *sb) |
ef818a28 SD |
441 | { |
442 | struct nfs_server *server = NFS_SB(sb); | |
1daef0a8 TM |
443 | |
444 | if (atomic_dec_and_test(&server->active)) | |
445 | deactivate_super(sb); | |
ef818a28 SD |
446 | } |
447 | ||
f7b422b1 DH |
448 | /* |
449 | * Deliver file system statistics to userspace | |
450 | */ | |
816724e6 | 451 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 452 | { |
0c7d90cf | 453 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
454 | unsigned char blockbits; |
455 | unsigned long blockres; | |
0c7d90cf | 456 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
ca7e9a0d TM |
457 | struct nfs_fsstat res; |
458 | int error = -ENOMEM; | |
459 | ||
460 | res.fattr = nfs_alloc_fattr(); | |
461 | if (res.fattr == NULL) | |
462 | goto out_err; | |
f7b422b1 | 463 | |
8fa5c000 | 464 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
fbf3fdd2 MZ |
465 | if (unlikely(error == -ESTALE)) { |
466 | struct dentry *pd_dentry; | |
467 | ||
468 | pd_dentry = dget_parent(dentry); | |
469 | if (pd_dentry != NULL) { | |
470 | nfs_zap_caches(pd_dentry->d_inode); | |
471 | dput(pd_dentry); | |
472 | } | |
473 | } | |
ca7e9a0d | 474 | nfs_free_fattr(res.fattr); |
f7b422b1 DH |
475 | if (error < 0) |
476 | goto out_err; | |
ca7e9a0d | 477 | |
1a0ba9ae | 478 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
479 | |
480 | /* | |
481 | * Current versions of glibc do not correctly handle the | |
482 | * case where f_frsize != f_bsize. Eventually we want to | |
483 | * report the value of wtmult in this field. | |
484 | */ | |
0c7d90cf | 485 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
486 | |
487 | /* | |
488 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
489 | * are reported in units of f_frsize. Linux hasn't had | |
490 | * an f_frsize field in its statfs struct until recently, | |
491 | * thus historically Linux's sys_statfs reports these | |
492 | * fields in units of f_bsize. | |
493 | */ | |
0c7d90cf DH |
494 | buf->f_bsize = dentry->d_sb->s_blocksize; |
495 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
496 | blockres = (1 << blockbits) - 1; |
497 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
498 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
499 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
500 | ||
501 | buf->f_files = res.tfiles; | |
502 | buf->f_ffree = res.afiles; | |
503 | ||
504 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 505 | |
f7b422b1 DH |
506 | return 0; |
507 | ||
508 | out_err: | |
3110ff80 | 509 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 510 | return error; |
f7b422b1 DH |
511 | } |
512 | ||
7d4e2747 DH |
513 | /* |
514 | * Map the security flavour number to a name | |
515 | */ | |
81039f1f TM |
516 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
517 | { | |
7d4e2747 | 518 | static const struct { |
81039f1f TM |
519 | rpc_authflavor_t flavour; |
520 | const char *str; | |
521 | } sec_flavours[] = { | |
522 | { RPC_AUTH_NULL, "null" }, | |
523 | { RPC_AUTH_UNIX, "sys" }, | |
524 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
525 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
526 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
527 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
528 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
529 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
530 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
531 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
532 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 533 | { UINT_MAX, "unknown" } |
81039f1f TM |
534 | }; |
535 | int i; | |
536 | ||
4d81cd16 | 537 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
538 | if (sec_flavours[i].flavour == flavour) |
539 | break; | |
540 | } | |
541 | return sec_flavours[i].str; | |
542 | } | |
543 | ||
ee671b01 JL |
544 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
545 | int showdefaults) | |
546 | { | |
547 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; | |
548 | ||
549 | seq_printf(m, ",mountproto="); | |
550 | switch (sap->sa_family) { | |
551 | case AF_INET: | |
552 | switch (nfss->mountd_protocol) { | |
553 | case IPPROTO_UDP: | |
554 | seq_printf(m, RPCBIND_NETID_UDP); | |
555 | break; | |
556 | case IPPROTO_TCP: | |
557 | seq_printf(m, RPCBIND_NETID_TCP); | |
558 | break; | |
559 | default: | |
560 | if (showdefaults) | |
561 | seq_printf(m, "auto"); | |
562 | } | |
563 | break; | |
564 | case AF_INET6: | |
565 | switch (nfss->mountd_protocol) { | |
566 | case IPPROTO_UDP: | |
567 | seq_printf(m, RPCBIND_NETID_UDP6); | |
568 | break; | |
569 | case IPPROTO_TCP: | |
570 | seq_printf(m, RPCBIND_NETID_TCP6); | |
571 | break; | |
572 | default: | |
573 | if (showdefaults) | |
574 | seq_printf(m, "auto"); | |
575 | } | |
576 | break; | |
577 | default: | |
578 | if (showdefaults) | |
579 | seq_printf(m, "auto"); | |
580 | } | |
581 | } | |
582 | ||
82d101d5 CL |
583 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
584 | int showdefaults) | |
585 | { | |
586 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
587 | ||
d5eff1a3 BS |
588 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
589 | return; | |
590 | ||
82d101d5 CL |
591 | switch (sap->sa_family) { |
592 | case AF_INET: { | |
593 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
be859405 | 594 | seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
82d101d5 CL |
595 | break; |
596 | } | |
597 | case AF_INET6: { | |
598 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
d250e190 | 599 | seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
82d101d5 CL |
600 | break; |
601 | } | |
602 | default: | |
603 | if (showdefaults) | |
604 | seq_printf(m, ",mountaddr=unspecified"); | |
605 | } | |
606 | ||
607 | if (nfss->mountd_version || showdefaults) | |
608 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
aa699473 SK |
609 | if ((nfss->mountd_port && |
610 | nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || | |
611 | showdefaults) | |
82d101d5 CL |
612 | seq_printf(m, ",mountport=%u", nfss->mountd_port); |
613 | ||
ee671b01 | 614 | nfs_show_mountd_netid(m, nfss, showdefaults); |
82d101d5 CL |
615 | } |
616 | ||
0be8189f TM |
617 | #ifdef CONFIG_NFS_V4 |
618 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
619 | int showdefaults) | |
620 | { | |
621 | struct nfs_client *clp = nfss->nfs_client; | |
622 | ||
623 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
624 | seq_printf(m, ",minorversion=%u", clp->cl_minorversion); | |
625 | } | |
626 | #else | |
627 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
628 | int showdefaults) | |
629 | { | |
630 | } | |
631 | #endif | |
632 | ||
f7b422b1 DH |
633 | /* |
634 | * Describe the mount options in force on this server representation | |
635 | */ | |
82d101d5 CL |
636 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
637 | int showdefaults) | |
f7b422b1 | 638 | { |
509de811 | 639 | static const struct proc_nfs_info { |
f7b422b1 | 640 | int flag; |
509de811 DH |
641 | const char *str; |
642 | const char *nostr; | |
f7b422b1 DH |
643 | } nfs_info[] = { |
644 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 | 645 | { NFS_MOUNT_POSIX, ",posix", "" }, |
f7b422b1 DH |
646 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
647 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
648 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
649 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 650 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
d740351b CL |
651 | { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
652 | { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, | |
f7b422b1 DH |
653 | { 0, NULL, NULL } |
654 | }; | |
509de811 | 655 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 656 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 657 | u32 version = clp->rpc_ops->version; |
7c563cc9 | 658 | int local_flock, local_fcntl; |
f7b422b1 | 659 | |
82d101d5 | 660 | seq_printf(m, ",vers=%u", version); |
2d767432 CL |
661 | seq_printf(m, ",rsize=%u", nfss->rsize); |
662 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
663 | if (nfss->bsize != 0) |
664 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
665 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 666 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 667 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 668 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 669 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 670 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 671 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 672 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 673 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
674 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
675 | if (nfss->flags & nfs_infop->flag) | |
676 | seq_puts(m, nfs_infop->str); | |
677 | else | |
678 | seq_puts(m, nfs_infop->nostr); | |
679 | } | |
56928edd | 680 | seq_printf(m, ",proto=%s", |
ee671b01 | 681 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
82d101d5 CL |
682 | if (version == 4) { |
683 | if (nfss->port != NFS_PORT) | |
684 | seq_printf(m, ",port=%u", nfss->port); | |
685 | } else | |
686 | if (nfss->port) | |
687 | seq_printf(m, ",port=%u", nfss->port); | |
688 | ||
33170233 TM |
689 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
690 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 691 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
692 | |
693 | if (version != 4) | |
694 | nfs_show_mountd_options(m, nfss, showdefaults); | |
0be8189f TM |
695 | else |
696 | nfs_show_nfsv4_options(m, nfss, showdefaults); | |
82d101d5 | 697 | |
b797cac7 DH |
698 | if (nfss->options & NFS_OPTION_FSCACHE) |
699 | seq_printf(m, ",fsc"); | |
9b00c643 PL |
700 | |
701 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { | |
702 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) | |
703 | seq_printf(m, ",lookupcache=none"); | |
704 | else | |
705 | seq_printf(m, ",lookupcache=pos"); | |
706 | } | |
7c563cc9 SJ |
707 | |
708 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; | |
709 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; | |
710 | ||
711 | if (!local_flock && !local_fcntl) | |
712 | seq_printf(m, ",local_lock=none"); | |
713 | else if (local_flock && local_fcntl) | |
714 | seq_printf(m, ",local_lock=all"); | |
715 | else if (local_flock) | |
716 | seq_printf(m, ",local_lock=flock"); | |
717 | else | |
718 | seq_printf(m, ",local_lock=posix"); | |
f7b422b1 DH |
719 | } |
720 | ||
721 | /* | |
722 | * Describe the mount options on this VFS mountpoint | |
723 | */ | |
724 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
725 | { | |
726 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
727 | ||
728 | nfs_show_mount_options(m, nfss, 0); | |
729 | ||
5d8515ca CL |
730 | seq_printf(m, ",addr=%s", |
731 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
732 | RPC_DISPLAY_ADDR)); | |
f7b422b1 DH |
733 | |
734 | return 0; | |
735 | } | |
ae50c0b5 BF |
736 | #ifdef CONFIG_NFS_V4_1 |
737 | void show_sessions(struct seq_file *m, struct nfs_server *server) | |
738 | { | |
739 | if (nfs4_has_session(server->nfs_client)) | |
740 | seq_printf(m, ",sessions"); | |
741 | } | |
742 | #else | |
743 | void show_sessions(struct seq_file *m, struct nfs_server *server) {} | |
744 | #endif | |
745 | ||
746 | #ifdef CONFIG_NFS_V4_1 | |
747 | void show_pnfs(struct seq_file *m, struct nfs_server *server) | |
748 | { | |
749 | seq_printf(m, ",pnfs="); | |
750 | if (server->pnfs_curr_ld) | |
751 | seq_printf(m, "%s", server->pnfs_curr_ld->name); | |
752 | else | |
753 | seq_printf(m, "not configured"); | |
754 | } | |
755 | #else /* CONFIG_NFS_V4_1 */ | |
756 | void show_pnfs(struct seq_file *m, struct nfs_server *server) {} | |
757 | #endif /* CONFIG_NFS_V4_1 */ | |
f7b422b1 | 758 | |
c7f404b4 AV |
759 | static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt) |
760 | { | |
761 | char *page = (char *) __get_free_page(GFP_KERNEL); | |
762 | char *devname, *dummy; | |
763 | int err = 0; | |
764 | if (!page) | |
765 | return -ENOMEM; | |
766 | devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE); | |
767 | if (IS_ERR(devname)) | |
768 | err = PTR_ERR(devname); | |
769 | else | |
770 | seq_escape(m, devname, " \t\n\\"); | |
771 | free_page((unsigned long)page); | |
772 | return err; | |
773 | } | |
774 | ||
775 | static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt) | |
776 | { | |
777 | seq_puts(m, "/"); | |
778 | return 0; | |
779 | } | |
780 | ||
f7b422b1 DH |
781 | /* |
782 | * Present statistical information for this VFS mountpoint | |
783 | */ | |
784 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
785 | { | |
786 | int i, cpu; | |
787 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
788 | struct rpc_auth *auth = nfss->client->cl_auth; | |
789 | struct nfs_iostats totals = { }; | |
790 | ||
791 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
792 | ||
793 | /* | |
794 | * Display all mount option settings | |
795 | */ | |
796 | seq_printf(m, "\n\topts:\t"); | |
797 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
798 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
799 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
800 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
801 | nfs_show_mount_options(m, nfss, 1); | |
802 | ||
803 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
804 | ||
805 | seq_printf(m, "\n\tcaps:\t"); | |
806 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
807 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
808 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
809 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
810 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
811 | |
812 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 813 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
814 | seq_printf(m, "\n\tnfsv4:\t"); |
815 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
816 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
817 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
ae50c0b5 BF |
818 | show_sessions(m, nfss); |
819 | show_pnfs(m, nfss); | |
f7b422b1 DH |
820 | } |
821 | #endif | |
822 | ||
823 | /* | |
824 | * Display security flavor in effect for this mount | |
825 | */ | |
2d767432 | 826 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 827 | if (auth->au_flavor) |
2d767432 | 828 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
829 | |
830 | /* | |
831 | * Display superblock I/O counters | |
832 | */ | |
833 | for_each_possible_cpu(cpu) { | |
834 | struct nfs_iostats *stats; | |
835 | ||
836 | preempt_disable(); | |
837 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
838 | ||
839 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
840 | totals.events[i] += stats->events[i]; | |
841 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
842 | totals.bytes[i] += stats->bytes[i]; | |
6a51091d DH |
843 | #ifdef CONFIG_NFS_FSCACHE |
844 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
845 | totals.fscache[i] += stats->fscache[i]; | |
846 | #endif | |
f7b422b1 DH |
847 | |
848 | preempt_enable(); | |
849 | } | |
850 | ||
851 | seq_printf(m, "\n\tevents:\t"); | |
852 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
853 | seq_printf(m, "%lu ", totals.events[i]); | |
854 | seq_printf(m, "\n\tbytes:\t"); | |
855 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
856 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
6a51091d DH |
857 | #ifdef CONFIG_NFS_FSCACHE |
858 | if (nfss->options & NFS_OPTION_FSCACHE) { | |
859 | seq_printf(m, "\n\tfsc:\t"); | |
860 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
861 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
862 | } | |
863 | #endif | |
f7b422b1 DH |
864 | seq_printf(m, "\n"); |
865 | ||
866 | rpc_print_iostats(m, nfss->client); | |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | /* | |
872 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 873 | * in response to xdev traversals and referrals |
f7b422b1 | 874 | */ |
42faad99 | 875 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 876 | { |
67e55205 | 877 | struct nfs_server *server; |
fc6ae3cf TM |
878 | struct rpc_clnt *rpc; |
879 | ||
67e55205 | 880 | server = NFS_SB(sb); |
fc6ae3cf TM |
881 | /* -EIO all pending I/O */ |
882 | rpc = server->client_acl; | |
883 | if (!IS_ERR(rpc)) | |
884 | rpc_killall_tasks(rpc); | |
885 | rpc = server->client; | |
886 | if (!IS_ERR(rpc)) | |
887 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
888 | } |
889 | ||
c5811dbd | 890 | static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) |
9423a08a CL |
891 | { |
892 | struct nfs_parsed_mount_data *data; | |
893 | ||
894 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
895 | if (data) { | |
9423a08a CL |
896 | data->acregmin = NFS_DEF_ACREGMIN; |
897 | data->acregmax = NFS_DEF_ACREGMAX; | |
898 | data->acdirmin = NFS_DEF_ACDIRMIN; | |
899 | data->acdirmax = NFS_DEF_ACDIRMAX; | |
c5811dbd | 900 | data->mount_server.port = NFS_UNSPEC_PORT; |
9423a08a | 901 | data->nfs_server.port = NFS_UNSPEC_PORT; |
c5811dbd | 902 | data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
9423a08a CL |
903 | data->auth_flavors[0] = RPC_AUTH_UNIX; |
904 | data->auth_flavor_len = 1; | |
c5811dbd | 905 | data->version = version; |
9423a08a CL |
906 | data->minorversion = 0; |
907 | } | |
908 | return data; | |
909 | } | |
910 | ||
fc50d58f | 911 | /* |
cdcd7f9a CL |
912 | * Sanity-check a server address provided by the mount command. |
913 | * | |
914 | * Address family must be initialized, and address must not be | |
915 | * the ANY address for that family. | |
fc50d58f CL |
916 | */ |
917 | static int nfs_verify_server_address(struct sockaddr *addr) | |
918 | { | |
919 | switch (addr->sa_family) { | |
920 | case AF_INET: { | |
cdcd7f9a | 921 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 922 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
923 | } |
924 | case AF_INET6: { | |
925 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
926 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
927 | } |
928 | } | |
929 | ||
53a0b9c4 | 930 | dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
fc50d58f CL |
931 | return 0; |
932 | } | |
933 | ||
4cfd74fc CL |
934 | /* |
935 | * Select between a default port value and a user-specified port value. | |
936 | * If a zero value is set, then autobind will be used. | |
937 | */ | |
f5855fec | 938 | static void nfs_set_port(struct sockaddr *sap, int *port, |
4cfd74fc CL |
939 | const unsigned short default_port) |
940 | { | |
f5855fec TM |
941 | if (*port == NFS_UNSPEC_PORT) |
942 | *port = default_port; | |
4cfd74fc | 943 | |
f5855fec | 944 | rpc_set_port(sap, *port); |
4cfd74fc CL |
945 | } |
946 | ||
259875ef TM |
947 | /* |
948 | * Sanity check the NFS transport protocol. | |
949 | * | |
950 | */ | |
951 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
952 | { | |
953 | switch (mnt->nfs_server.protocol) { | |
954 | case XPRT_TRANSPORT_UDP: | |
955 | case XPRT_TRANSPORT_TCP: | |
956 | case XPRT_TRANSPORT_RDMA: | |
957 | break; | |
958 | default: | |
959 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
960 | } | |
961 | } | |
962 | ||
963 | /* | |
964 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
965 | * settings should depend upon the specified NFS transport. | |
966 | */ | |
967 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
968 | { | |
969 | nfs_validate_transport_protocol(mnt); | |
970 | ||
971 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
972 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
973 | return; | |
974 | switch (mnt->nfs_server.protocol) { | |
975 | case XPRT_TRANSPORT_UDP: | |
976 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
977 | break; | |
978 | case XPRT_TRANSPORT_TCP: | |
979 | case XPRT_TRANSPORT_RDMA: | |
980 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
981 | } | |
982 | } | |
983 | ||
01060c89 CL |
984 | /* |
985 | * Parse the value of the 'sec=' option. | |
01060c89 CL |
986 | */ |
987 | static int nfs_parse_security_flavors(char *value, | |
988 | struct nfs_parsed_mount_data *mnt) | |
989 | { | |
990 | substring_t args[MAX_OPT_ARGS]; | |
991 | ||
992 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
993 | ||
994 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
995 | case Opt_sec_none: | |
01060c89 CL |
996 | mnt->auth_flavors[0] = RPC_AUTH_NULL; |
997 | break; | |
998 | case Opt_sec_sys: | |
01060c89 CL |
999 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
1000 | break; | |
1001 | case Opt_sec_krb5: | |
01060c89 CL |
1002 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
1003 | break; | |
1004 | case Opt_sec_krb5i: | |
01060c89 CL |
1005 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
1006 | break; | |
1007 | case Opt_sec_krb5p: | |
01060c89 CL |
1008 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
1009 | break; | |
1010 | case Opt_sec_lkey: | |
01060c89 CL |
1011 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
1012 | break; | |
1013 | case Opt_sec_lkeyi: | |
01060c89 CL |
1014 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
1015 | break; | |
1016 | case Opt_sec_lkeyp: | |
01060c89 CL |
1017 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
1018 | break; | |
1019 | case Opt_sec_spkm: | |
01060c89 CL |
1020 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
1021 | break; | |
1022 | case Opt_sec_spkmi: | |
01060c89 CL |
1023 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
1024 | break; | |
1025 | case Opt_sec_spkmp: | |
01060c89 CL |
1026 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
1027 | break; | |
1028 | default: | |
1029 | return 0; | |
1030 | } | |
1031 | ||
9b7160c5 | 1032 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
059f90b3 | 1033 | mnt->auth_flavor_len = 1; |
01060c89 CL |
1034 | return 1; |
1035 | } | |
1036 | ||
c5cb09b6 RL |
1037 | static int nfs_get_option_str(substring_t args[], char **option) |
1038 | { | |
1039 | kfree(*option); | |
1040 | *option = match_strdup(args); | |
1041 | return !option; | |
1042 | } | |
1043 | ||
1044 | static int nfs_get_option_ul(substring_t args[], unsigned long *option) | |
1045 | { | |
1046 | int rc; | |
1047 | char *string; | |
1048 | ||
1049 | string = match_strdup(args); | |
1050 | if (string == NULL) | |
1051 | return -ENOMEM; | |
1052 | rc = strict_strtoul(string, 10, option); | |
1053 | kfree(string); | |
1054 | ||
1055 | return rc; | |
1056 | } | |
1057 | ||
bf0fd768 CL |
1058 | /* |
1059 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
1060 | * a data structure. The whole mount string is processed; bad options are |
1061 | * skipped as they are encountered. If there were no errors, return 1; | |
1062 | * otherwise return 0 (zero). | |
bf0fd768 CL |
1063 | */ |
1064 | static int nfs_parse_mount_options(char *raw, | |
1065 | struct nfs_parsed_mount_data *mnt) | |
1066 | { | |
f9c3a380 | 1067 | char *p, *string, *secdata; |
d23c45fd | 1068 | int rc, sloppy = 0, invalid_option = 0; |
ee671b01 JL |
1069 | unsigned short protofamily = AF_UNSPEC; |
1070 | unsigned short mountfamily = AF_UNSPEC; | |
bf0fd768 CL |
1071 | |
1072 | if (!raw) { | |
1073 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
1074 | return 1; | |
1075 | } | |
1076 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
1077 | ||
f9c3a380 EP |
1078 | secdata = alloc_secdata(); |
1079 | if (!secdata) | |
1080 | goto out_nomem; | |
1081 | ||
1082 | rc = security_sb_copy_data(raw, secdata); | |
1083 | if (rc) | |
1084 | goto out_security_failure; | |
1085 | ||
1086 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
1087 | if (rc) | |
1088 | goto out_security_failure; | |
1089 | ||
1090 | free_secdata(secdata); | |
1091 | ||
bf0fd768 CL |
1092 | while ((p = strsep(&raw, ",")) != NULL) { |
1093 | substring_t args[MAX_OPT_ARGS]; | |
a5a16bae CL |
1094 | unsigned long option; |
1095 | int token; | |
bf0fd768 CL |
1096 | |
1097 | if (!*p) | |
1098 | continue; | |
1099 | ||
1100 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
1101 | ||
1102 | token = match_token(p, nfs_mount_option_tokens, args); | |
1103 | switch (token) { | |
f45663ce CL |
1104 | |
1105 | /* | |
1106 | * boolean options: foo/nofoo | |
1107 | */ | |
bf0fd768 CL |
1108 | case Opt_soft: |
1109 | mnt->flags |= NFS_MOUNT_SOFT; | |
1110 | break; | |
1111 | case Opt_hard: | |
1112 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
1113 | break; | |
bf0fd768 CL |
1114 | case Opt_posix: |
1115 | mnt->flags |= NFS_MOUNT_POSIX; | |
1116 | break; | |
1117 | case Opt_noposix: | |
1118 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
1119 | break; | |
1120 | case Opt_cto: | |
1121 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
1122 | break; | |
1123 | case Opt_nocto: | |
1124 | mnt->flags |= NFS_MOUNT_NOCTO; | |
1125 | break; | |
1126 | case Opt_ac: | |
1127 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
1128 | break; | |
1129 | case Opt_noac: | |
1130 | mnt->flags |= NFS_MOUNT_NOAC; | |
1131 | break; | |
1132 | case Opt_lock: | |
1133 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1134 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
1135 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1136 | break; |
1137 | case Opt_nolock: | |
1138 | mnt->flags |= NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1139 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
1140 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1141 | break; |
1142 | case Opt_v2: | |
1143 | mnt->flags &= ~NFS_MOUNT_VER3; | |
764302cc | 1144 | mnt->version = 2; |
bf0fd768 CL |
1145 | break; |
1146 | case Opt_v3: | |
1147 | mnt->flags |= NFS_MOUNT_VER3; | |
764302cc | 1148 | mnt->version = 3; |
bf0fd768 | 1149 | break; |
764302cc CL |
1150 | case Opt_v4: |
1151 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1152 | mnt->version = 4; | |
1153 | break; | |
bf0fd768 CL |
1154 | case Opt_udp: |
1155 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1156 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1157 | break; |
1158 | case Opt_tcp: | |
1159 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1160 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1161 | break; |
2cf7ff7a TT |
1162 | case Opt_rdma: |
1163 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1164 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1165 | xprt_load_transport(p); |
2cf7ff7a | 1166 | break; |
bf0fd768 CL |
1167 | case Opt_acl: |
1168 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1169 | break; | |
1170 | case Opt_noacl: | |
1171 | mnt->flags |= NFS_MOUNT_NOACL; | |
1172 | break; | |
1173 | case Opt_rdirplus: | |
1174 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1175 | break; | |
1176 | case Opt_nordirplus: | |
1177 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1178 | break; | |
75180df2 TM |
1179 | case Opt_sharecache: |
1180 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1181 | break; | |
1182 | case Opt_nosharecache: | |
1183 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1184 | break; | |
d740351b CL |
1185 | case Opt_resvport: |
1186 | mnt->flags &= ~NFS_MOUNT_NORESVPORT; | |
1187 | break; | |
1188 | case Opt_noresvport: | |
1189 | mnt->flags |= NFS_MOUNT_NORESVPORT; | |
1190 | break; | |
b797cac7 DH |
1191 | case Opt_fscache: |
1192 | mnt->options |= NFS_OPTION_FSCACHE; | |
1193 | kfree(mnt->fscache_uniq); | |
1194 | mnt->fscache_uniq = NULL; | |
1195 | break; | |
1196 | case Opt_nofscache: | |
1197 | mnt->options &= ~NFS_OPTION_FSCACHE; | |
1198 | kfree(mnt->fscache_uniq); | |
1199 | mnt->fscache_uniq = NULL; | |
1200 | break; | |
bf0fd768 | 1201 | |
f45663ce CL |
1202 | /* |
1203 | * options that take numeric values | |
1204 | */ | |
bf0fd768 | 1205 | case Opt_port: |
c5cb09b6 RL |
1206 | if (nfs_get_option_ul(args, &option) || |
1207 | option > USHRT_MAX) | |
d23c45fd CL |
1208 | goto out_invalid_value; |
1209 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1210 | break; |
1211 | case Opt_rsize: | |
c5cb09b6 | 1212 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1213 | goto out_invalid_value; |
1214 | mnt->rsize = option; | |
bf0fd768 CL |
1215 | break; |
1216 | case Opt_wsize: | |
c5cb09b6 | 1217 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1218 | goto out_invalid_value; |
1219 | mnt->wsize = option; | |
bf0fd768 CL |
1220 | break; |
1221 | case Opt_bsize: | |
c5cb09b6 | 1222 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1223 | goto out_invalid_value; |
1224 | mnt->bsize = option; | |
bf0fd768 CL |
1225 | break; |
1226 | case Opt_timeo: | |
c5cb09b6 | 1227 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1228 | goto out_invalid_value; |
1229 | mnt->timeo = option; | |
bf0fd768 CL |
1230 | break; |
1231 | case Opt_retrans: | |
c5cb09b6 | 1232 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1233 | goto out_invalid_value; |
1234 | mnt->retrans = option; | |
bf0fd768 CL |
1235 | break; |
1236 | case Opt_acregmin: | |
c5cb09b6 | 1237 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1238 | goto out_invalid_value; |
1239 | mnt->acregmin = option; | |
bf0fd768 CL |
1240 | break; |
1241 | case Opt_acregmax: | |
c5cb09b6 | 1242 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1243 | goto out_invalid_value; |
1244 | mnt->acregmax = option; | |
bf0fd768 CL |
1245 | break; |
1246 | case Opt_acdirmin: | |
c5cb09b6 | 1247 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1248 | goto out_invalid_value; |
1249 | mnt->acdirmin = option; | |
bf0fd768 CL |
1250 | break; |
1251 | case Opt_acdirmax: | |
c5cb09b6 | 1252 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1253 | goto out_invalid_value; |
1254 | mnt->acdirmax = option; | |
bf0fd768 CL |
1255 | break; |
1256 | case Opt_actimeo: | |
c5cb09b6 | 1257 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1258 | goto out_invalid_value; |
1259 | mnt->acregmin = mnt->acregmax = | |
1260 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1261 | break; |
1262 | case Opt_namelen: | |
c5cb09b6 | 1263 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1264 | goto out_invalid_value; |
1265 | mnt->namlen = option; | |
bf0fd768 CL |
1266 | break; |
1267 | case Opt_mountport: | |
c5cb09b6 RL |
1268 | if (nfs_get_option_ul(args, &option) || |
1269 | option > USHRT_MAX) | |
d23c45fd CL |
1270 | goto out_invalid_value; |
1271 | mnt->mount_server.port = option; | |
bf0fd768 | 1272 | break; |
bf0fd768 | 1273 | case Opt_mountvers: |
c5cb09b6 | 1274 | if (nfs_get_option_ul(args, &option) || |
f45663ce | 1275 | option < NFS_MNT_VERSION || |
d23c45fd CL |
1276 | option > NFS_MNT3_VERSION) |
1277 | goto out_invalid_value; | |
1278 | mnt->mount_server.version = option; | |
bf0fd768 | 1279 | break; |
bf0fd768 | 1280 | case Opt_nfsvers: |
c5cb09b6 | 1281 | if (nfs_get_option_ul(args, &option)) |
d23c45fd | 1282 | goto out_invalid_value; |
bf0fd768 | 1283 | switch (option) { |
f45663ce | 1284 | case NFS2_VERSION: |
bf0fd768 | 1285 | mnt->flags &= ~NFS_MOUNT_VER3; |
764302cc | 1286 | mnt->version = 2; |
bf0fd768 | 1287 | break; |
f45663ce | 1288 | case NFS3_VERSION: |
bf0fd768 | 1289 | mnt->flags |= NFS_MOUNT_VER3; |
764302cc CL |
1290 | mnt->version = 3; |
1291 | break; | |
764302cc CL |
1292 | case NFS4_VERSION: |
1293 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1294 | mnt->version = 4; | |
bf0fd768 CL |
1295 | break; |
1296 | default: | |
d23c45fd | 1297 | goto out_invalid_value; |
bf0fd768 CL |
1298 | } |
1299 | break; | |
3fd5be9e | 1300 | case Opt_minorversion: |
c5cb09b6 | 1301 | if (nfs_get_option_ul(args, &option)) |
f3f4f4ed CL |
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; |
bf0fd768 | 1337 | break; |
ee671b01 JL |
1338 | case Opt_xprt_tcp6: |
1339 | protofamily = AF_INET6; | |
fdb66ff4 | 1340 | case Opt_xprt_tcp: |
bf0fd768 | 1341 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1342 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1343 | break; |
2cf7ff7a TT |
1344 | case Opt_xprt_rdma: |
1345 | /* vector side protocols to TCP */ | |
1346 | mnt->flags |= NFS_MOUNT_TCP; | |
1347 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1348 | xprt_load_transport(string); |
2cf7ff7a | 1349 | break; |
bf0fd768 | 1350 | default: |
f45663ce CL |
1351 | dfprintk(MOUNT, "NFS: unrecognized " |
1352 | "transport protocol\n"); | |
4223a4a1 | 1353 | kfree(string); |
d23c45fd | 1354 | return 0; |
bf0fd768 | 1355 | } |
c5cb09b6 | 1356 | kfree(string); |
bf0fd768 CL |
1357 | break; |
1358 | case Opt_mountproto: | |
1359 | string = match_strdup(args); | |
1360 | if (string == NULL) | |
1361 | goto out_nomem; | |
1362 | token = match_token(string, | |
1363 | nfs_xprt_protocol_tokens, args); | |
d508afb4 | 1364 | kfree(string); |
bf0fd768 | 1365 | |
ee671b01 | 1366 | mountfamily = AF_INET; |
bf0fd768 | 1367 | switch (token) { |
ee671b01 JL |
1368 | case Opt_xprt_udp6: |
1369 | mountfamily = AF_INET6; | |
fdb66ff4 | 1370 | case Opt_xprt_udp: |
0896a725 | 1371 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1372 | break; |
ee671b01 JL |
1373 | case Opt_xprt_tcp6: |
1374 | mountfamily = AF_INET6; | |
fdb66ff4 | 1375 | case Opt_xprt_tcp: |
0896a725 | 1376 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1377 | break; |
2cf7ff7a | 1378 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1379 | default: |
f45663ce CL |
1380 | dfprintk(MOUNT, "NFS: unrecognized " |
1381 | "transport protocol\n"); | |
d23c45fd | 1382 | return 0; |
bf0fd768 CL |
1383 | } |
1384 | break; | |
1385 | case Opt_addr: | |
1386 | string = match_strdup(args); | |
1387 | if (string == NULL) | |
1388 | goto out_nomem; | |
53a0b9c4 CL |
1389 | mnt->nfs_server.addrlen = |
1390 | rpc_pton(string, strlen(string), | |
1391 | (struct sockaddr *) | |
1392 | &mnt->nfs_server.address, | |
1393 | sizeof(mnt->nfs_server.address)); | |
bf0fd768 | 1394 | kfree(string); |
53a0b9c4 CL |
1395 | if (mnt->nfs_server.addrlen == 0) |
1396 | goto out_invalid_address; | |
bf0fd768 CL |
1397 | break; |
1398 | case Opt_clientaddr: | |
c5cb09b6 | 1399 | if (nfs_get_option_str(args, &mnt->client_address)) |
bf0fd768 | 1400 | goto out_nomem; |
bf0fd768 | 1401 | break; |
33832034 | 1402 | case Opt_mounthost: |
c5cb09b6 RL |
1403 | if (nfs_get_option_str(args, |
1404 | &mnt->mount_server.hostname)) | |
33832034 | 1405 | goto out_nomem; |
33832034 | 1406 | break; |
0ac83779 | 1407 | case Opt_mountaddr: |
bf0fd768 CL |
1408 | string = match_strdup(args); |
1409 | if (string == NULL) | |
1410 | goto out_nomem; | |
53a0b9c4 CL |
1411 | mnt->mount_server.addrlen = |
1412 | rpc_pton(string, strlen(string), | |
1413 | (struct sockaddr *) | |
1414 | &mnt->mount_server.address, | |
1415 | sizeof(mnt->mount_server.address)); | |
bf0fd768 | 1416 | kfree(string); |
53a0b9c4 CL |
1417 | if (mnt->mount_server.addrlen == 0) |
1418 | goto out_invalid_address; | |
bf0fd768 | 1419 | break; |
7973c1f1 TM |
1420 | case Opt_lookupcache: |
1421 | string = match_strdup(args); | |
1422 | if (string == NULL) | |
1423 | goto out_nomem; | |
1424 | token = match_token(string, | |
1425 | nfs_lookupcache_tokens, args); | |
1426 | kfree(string); | |
1427 | switch (token) { | |
1428 | case Opt_lookupcache_all: | |
1429 | mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); | |
1430 | break; | |
1431 | case Opt_lookupcache_positive: | |
1432 | mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1433 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; | |
1434 | break; | |
1435 | case Opt_lookupcache_none: | |
1436 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1437 | break; | |
1438 | default: | |
7973c1f1 TM |
1439 | dfprintk(MOUNT, "NFS: invalid " |
1440 | "lookupcache argument\n"); | |
d23c45fd | 1441 | return 0; |
7973c1f1 TM |
1442 | }; |
1443 | break; | |
a6d5ff64 | 1444 | case Opt_fscache_uniq: |
c5cb09b6 | 1445 | if (nfs_get_option_str(args, &mnt->fscache_uniq)) |
a6d5ff64 | 1446 | goto out_nomem; |
a6d5ff64 CL |
1447 | mnt->options |= NFS_OPTION_FSCACHE; |
1448 | break; | |
5eebde23 SJ |
1449 | case Opt_local_lock: |
1450 | string = match_strdup(args); | |
1451 | if (string == NULL) | |
1452 | goto out_nomem; | |
1453 | token = match_token(string, nfs_local_lock_tokens, | |
1454 | args); | |
1455 | kfree(string); | |
1456 | switch (token) { | |
1457 | case Opt_local_lock_all: | |
1458 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | | |
1459 | NFS_MOUNT_LOCAL_FCNTL); | |
1460 | break; | |
1461 | case Opt_local_lock_flock: | |
1462 | mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; | |
1463 | break; | |
1464 | case Opt_local_lock_posix: | |
1465 | mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; | |
1466 | break; | |
1467 | case Opt_local_lock_none: | |
1468 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | | |
1469 | NFS_MOUNT_LOCAL_FCNTL); | |
1470 | break; | |
1471 | default: | |
1472 | dfprintk(MOUNT, "NFS: invalid " | |
1473 | "local_lock argument\n"); | |
1474 | return 0; | |
1475 | }; | |
1476 | break; | |
bf0fd768 | 1477 | |
f45663ce CL |
1478 | /* |
1479 | * Special options | |
1480 | */ | |
1481 | case Opt_sloppy: | |
1482 | sloppy = 1; | |
1483 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1484 | break; | |
bf0fd768 CL |
1485 | case Opt_userspace: |
1486 | case Opt_deprecated: | |
d33e4dfe CL |
1487 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1488 | "'%s'\n", p); | |
bf0fd768 CL |
1489 | break; |
1490 | ||
1491 | default: | |
d23c45fd | 1492 | invalid_option = 1; |
f45663ce CL |
1493 | dfprintk(MOUNT, "NFS: unrecognized mount option " |
1494 | "'%s'\n", p); | |
bf0fd768 CL |
1495 | } |
1496 | } | |
1497 | ||
d23c45fd CL |
1498 | if (!sloppy && invalid_option) |
1499 | return 0; | |
1500 | ||
ee671b01 JL |
1501 | /* |
1502 | * verify that any proto=/mountproto= options match the address | |
1503 | * familiies in the addr=/mountaddr= options. | |
1504 | */ | |
1505 | if (protofamily != AF_UNSPEC && | |
1506 | protofamily != mnt->nfs_server.address.ss_family) | |
1507 | goto out_proto_mismatch; | |
1508 | ||
1509 | if (mountfamily != AF_UNSPEC) { | |
1510 | if (mnt->mount_server.addrlen) { | |
1511 | if (mountfamily != mnt->mount_server.address.ss_family) | |
1512 | goto out_mountproto_mismatch; | |
1513 | } else { | |
1514 | if (mountfamily != mnt->nfs_server.address.ss_family) | |
1515 | goto out_mountproto_mismatch; | |
1516 | } | |
1517 | } | |
1518 | ||
bf0fd768 CL |
1519 | return 1; |
1520 | ||
ee671b01 JL |
1521 | out_mountproto_mismatch: |
1522 | printk(KERN_INFO "NFS: mount server address does not match mountproto= " | |
1523 | "option\n"); | |
1524 | return 0; | |
1525 | out_proto_mismatch: | |
1526 | printk(KERN_INFO "NFS: server address does not match proto= option\n"); | |
1527 | return 0; | |
53a0b9c4 CL |
1528 | out_invalid_address: |
1529 | printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); | |
1530 | return 0; | |
d23c45fd | 1531 | out_invalid_value: |
53a0b9c4 | 1532 | printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
d23c45fd | 1533 | return 0; |
bf0fd768 CL |
1534 | out_nomem: |
1535 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1536 | return 0; | |
f9c3a380 EP |
1537 | out_security_failure: |
1538 | free_secdata(secdata); | |
1539 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1540 | return 0; | |
bf0fd768 CL |
1541 | } |
1542 | ||
ec88f28d CL |
1543 | /* |
1544 | * Match the requested auth flavors with the list returned by | |
1545 | * the server. Returns zero and sets the mount's authentication | |
1546 | * flavor on success; returns -EACCES if server does not support | |
1547 | * the requested flavor. | |
1548 | */ | |
1549 | static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, | |
1550 | struct nfs_mount_request *request) | |
1551 | { | |
1552 | unsigned int i, j, server_authlist_len = *(request->auth_flav_len); | |
1553 | ||
5eecfde6 CL |
1554 | /* |
1555 | * Certain releases of Linux's mountd return an empty | |
1556 | * flavor list. To prevent behavioral regression with | |
1557 | * these servers (ie. rejecting mounts that used to | |
1558 | * succeed), revert to pre-2.6.32 behavior (no checking) | |
1559 | * if the returned flavor list is empty. | |
1560 | */ | |
1561 | if (server_authlist_len == 0) | |
1562 | return 0; | |
1563 | ||
ec88f28d CL |
1564 | /* |
1565 | * We avoid sophisticated negotiating here, as there are | |
1566 | * plenty of cases where we can get it wrong, providing | |
1567 | * either too little or too much security. | |
1568 | * | |
1569 | * RFC 2623, section 2.7 suggests we SHOULD prefer the | |
1570 | * flavor listed first. However, some servers list | |
1571 | * AUTH_NULL first. Our caller plants AUTH_SYS, the | |
1572 | * preferred default, in args->auth_flavors[0] if user | |
1573 | * didn't specify sec= mount option. | |
1574 | */ | |
1575 | for (i = 0; i < args->auth_flavor_len; i++) | |
1576 | for (j = 0; j < server_authlist_len; j++) | |
1577 | if (args->auth_flavors[i] == request->auth_flavs[j]) { | |
1578 | dfprintk(MOUNT, "NFS: using auth flavor %d\n", | |
1579 | request->auth_flavs[j]); | |
1580 | args->auth_flavors[0] = request->auth_flavs[j]; | |
1581 | return 0; | |
1582 | } | |
1583 | ||
1584 | dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); | |
1585 | nfs_umount(request); | |
1586 | return -EACCES; | |
1587 | } | |
1588 | ||
0076d7b7 CL |
1589 | /* |
1590 | * Use the remote server's MOUNT service to request the NFS file handle | |
1591 | * corresponding to the provided path. | |
1592 | */ | |
1593 | static int nfs_try_mount(struct nfs_parsed_mount_data *args, | |
1594 | struct nfs_fh *root_fh) | |
1595 | { | |
ec88f28d CL |
1596 | rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
1597 | unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); | |
c5d120f8 CL |
1598 | struct nfs_mount_request request = { |
1599 | .sap = (struct sockaddr *) | |
1600 | &args->mount_server.address, | |
1601 | .dirpath = args->nfs_server.export_path, | |
1602 | .protocol = args->mount_server.protocol, | |
1603 | .fh = root_fh, | |
50a737f8 | 1604 | .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
ec88f28d CL |
1605 | .auth_flav_len = &server_authlist_len, |
1606 | .auth_flavs = server_authlist, | |
c5d120f8 | 1607 | }; |
4c568017 | 1608 | int status; |
0076d7b7 CL |
1609 | |
1610 | if (args->mount_server.version == 0) { | |
8a6e5deb TM |
1611 | switch (args->version) { |
1612 | default: | |
1613 | args->mount_server.version = NFS_MNT3_VERSION; | |
1614 | break; | |
1615 | case 2: | |
1616 | args->mount_server.version = NFS_MNT_VERSION; | |
1617 | } | |
0076d7b7 | 1618 | } |
c5d120f8 | 1619 | request.version = args->mount_server.version; |
0076d7b7 | 1620 | |
33832034 | 1621 | if (args->mount_server.hostname) |
c5d120f8 | 1622 | request.hostname = args->mount_server.hostname; |
33832034 | 1623 | else |
c5d120f8 | 1624 | request.hostname = args->nfs_server.hostname; |
33832034 | 1625 | |
0076d7b7 CL |
1626 | /* |
1627 | * Construct the mount server's address. | |
1628 | */ | |
4c568017 | 1629 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
c5d120f8 | 1630 | memcpy(request.sap, &args->nfs_server.address, |
4c568017 CL |
1631 | args->nfs_server.addrlen); |
1632 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1633 | } | |
c5d120f8 | 1634 | request.salen = args->mount_server.addrlen; |
f5855fec | 1635 | nfs_set_port(request.sap, &args->mount_server.port, 0); |
0076d7b7 CL |
1636 | |
1637 | /* | |
1638 | * Now ask the mount server to map our export path | |
1639 | * to a file handle. | |
1640 | */ | |
c5d120f8 | 1641 | status = nfs_mount(&request); |
ec88f28d CL |
1642 | if (status != 0) { |
1643 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", | |
1644 | request.hostname, status); | |
1645 | return status; | |
1646 | } | |
0076d7b7 | 1647 | |
ec88f28d CL |
1648 | /* |
1649 | * MNTv1 (NFSv2) does not support auth flavor negotiation. | |
1650 | */ | |
1651 | if (args->mount_server.version != NFS_MNT3_VERSION) | |
1652 | return 0; | |
1653 | return nfs_walk_authlist(args, &request); | |
0076d7b7 CL |
1654 | } |
1655 | ||
c12bacec RL |
1656 | /* |
1657 | * Split "dev_name" into "hostname:export_path". | |
1658 | * | |
1659 | * The leftmost colon demarks the split between the server's hostname | |
1660 | * and the export path. If the hostname starts with a left square | |
1661 | * bracket, then it may contain colons. | |
1662 | * | |
1663 | * Note: caller frees hostname and export path, even on error. | |
1664 | */ | |
1665 | static int nfs_parse_devname(const char *dev_name, | |
1666 | char **hostname, size_t maxnamlen, | |
1667 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1668 | { |
1669 | size_t len; | |
c12bacec | 1670 | char *end; |
dc045898 | 1671 | |
c12bacec RL |
1672 | /* Is the host name protected with square brakcets? */ |
1673 | if (*dev_name == '[') { | |
1674 | end = strchr(++dev_name, ']'); | |
1675 | if (end == NULL || end[1] != ':') | |
dc045898 | 1676 | goto out_bad_devname; |
dc045898 | 1677 | |
c12bacec RL |
1678 | len = end - dev_name; |
1679 | end++; | |
1680 | } else { | |
1681 | char *comma; | |
dc045898 | 1682 | |
c12bacec RL |
1683 | end = strchr(dev_name, ':'); |
1684 | if (end == NULL) | |
1685 | goto out_bad_devname; | |
1686 | len = end - dev_name; | |
d1aa0825 | 1687 | |
c12bacec RL |
1688 | /* kill possible hostname list: not supported */ |
1689 | comma = strchr(dev_name, ','); | |
1690 | if (comma != NULL && comma < end) | |
1691 | *comma = 0; | |
1692 | } | |
d1aa0825 | 1693 | |
d1aa0825 CL |
1694 | if (len > maxnamlen) |
1695 | goto out_hostname; | |
1696 | ||
1697 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
c12bacec | 1698 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); |
d1aa0825 CL |
1699 | if (*hostname == NULL) |
1700 | goto out_nomem; | |
c12bacec | 1701 | len = strlen(++end); |
d1aa0825 CL |
1702 | if (len > maxpathlen) |
1703 | goto out_path; | |
1704 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1705 | if (!*export_path) | |
1706 | goto out_nomem; | |
1707 | ||
c12bacec | 1708 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); |
d1aa0825 CL |
1709 | return 0; |
1710 | ||
1711 | out_bad_devname: | |
1712 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1713 | return -EINVAL; | |
1714 | ||
1715 | out_nomem: | |
1716 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1717 | return -ENOMEM; | |
1718 | ||
1719 | out_hostname: | |
1720 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1721 | return -ENAMETOOLONG; | |
1722 | ||
1723 | out_path: | |
1724 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1725 | return -ENAMETOOLONG; | |
1726 | } | |
1727 | ||
f7b422b1 | 1728 | /* |
54ceac45 DH |
1729 | * Validate the NFS2/NFS3 mount data |
1730 | * - fills in the mount root filehandle | |
136d558c CL |
1731 | * |
1732 | * For option strings, user space handles the following behaviors: | |
1733 | * | |
1734 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1735 | * | |
1736 | * + failure mode: how to behave if a mount request can't be handled | |
1737 | * immediately ("fg/bg" option) | |
1738 | * | |
1739 | * + retry: how often to retry a mount request ("retry=" option) | |
1740 | * | |
1741 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1742 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1743 | */ |
2283f8d6 TT |
1744 | static int nfs_validate_mount_data(void *options, |
1745 | struct nfs_parsed_mount_data *args, | |
136d558c CL |
1746 | struct nfs_fh *mntfh, |
1747 | const char *dev_name) | |
f7b422b1 | 1748 | { |
2283f8d6 | 1749 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
4cfd74fc | 1750 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
136d558c | 1751 | |
5df36e78 CL |
1752 | if (data == NULL) |
1753 | goto out_no_data; | |
f7b422b1 | 1754 | |
54ceac45 | 1755 | switch (data->version) { |
5df36e78 CL |
1756 | case 1: |
1757 | data->namlen = 0; | |
1758 | case 2: | |
1759 | data->bsize = 0; | |
1760 | case 3: | |
1761 | if (data->flags & NFS_MOUNT_VER3) | |
1762 | goto out_no_v3; | |
1763 | data->root.size = NFS2_FHSIZE; | |
1764 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1765 | case 4: | |
1766 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1767 | goto out_no_sec; | |
1768 | case 5: | |
1769 | memset(data->context, 0, sizeof(data->context)); | |
1770 | case 6: | |
b7e24457 TM |
1771 | if (data->flags & NFS_MOUNT_VER3) { |
1772 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1773 | goto out_invalid_fh; | |
5df36e78 | 1774 | mntfh->size = data->root.size; |
764302cc CL |
1775 | args->version = 3; |
1776 | } else { | |
5df36e78 | 1777 | mntfh->size = NFS2_FHSIZE; |
764302cc CL |
1778 | args->version = 2; |
1779 | } | |
5df36e78 | 1780 | |
5df36e78 CL |
1781 | |
1782 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1783 | if (mntfh->size < sizeof(mntfh->data)) | |
1784 | memset(mntfh->data + mntfh->size, 0, | |
1785 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1786 | |
2283f8d6 TT |
1787 | /* |
1788 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1789 | * can deal with. | |
1790 | */ | |
ff3525a5 | 1791 | args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
d5eff1a3 | 1792 | args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
2283f8d6 TT |
1793 | args->rsize = data->rsize; |
1794 | args->wsize = data->wsize; | |
2283f8d6 TT |
1795 | args->timeo = data->timeo; |
1796 | args->retrans = data->retrans; | |
1797 | args->acregmin = data->acregmin; | |
1798 | args->acregmax = data->acregmax; | |
1799 | args->acdirmin = data->acdirmin; | |
1800 | args->acdirmax = data->acdirmax; | |
4c568017 | 1801 | |
4cfd74fc | 1802 | memcpy(sap, &data->addr, sizeof(data->addr)); |
4c568017 | 1803 | args->nfs_server.addrlen = sizeof(data->addr); |
4cfd74fc | 1804 | if (!nfs_verify_server_address(sap)) |
4c568017 CL |
1805 | goto out_no_address; |
1806 | ||
2283f8d6 | 1807 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1808 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1809 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1810 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1811 | args->namlen = data->namlen; | |
1812 | args->bsize = data->bsize; | |
dd07c947 CL |
1813 | |
1814 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1815 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1816 | if (!args->nfs_server.hostname) |
1817 | goto out_nomem; | |
f9c3a380 | 1818 | |
5eebde23 SJ |
1819 | if (!(data->flags & NFS_MOUNT_NONLM)) |
1820 | args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| | |
1821 | NFS_MOUNT_LOCAL_FCNTL); | |
1822 | else | |
1823 | args->flags |= (NFS_MOUNT_LOCAL_FLOCK| | |
1824 | NFS_MOUNT_LOCAL_FCNTL); | |
f9c3a380 EP |
1825 | /* |
1826 | * The legacy version 6 binary mount data from userspace has a | |
1827 | * field used only to transport selinux information into the | |
1828 | * the kernel. To continue to support that functionality we | |
1829 | * have a touch of selinux knowledge here in the NFS code. The | |
1830 | * userspace code converted context=blah to just blah so we are | |
1831 | * converting back to the full string selinux understands. | |
1832 | */ | |
1833 | if (data->context[0]){ | |
1834 | #ifdef CONFIG_SECURITY_SELINUX | |
1835 | int rc; | |
1836 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1837 | if (!opts_str) | |
1838 | return -ENOMEM; | |
1839 | strcpy(opts_str, "context="); | |
1840 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1841 | strcat(opts_str, &data->context[0]); | |
1842 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1843 | kfree(opts_str); | |
1844 | if (rc) | |
1845 | return rc; | |
1846 | #else | |
1847 | return -EINVAL; | |
1848 | #endif | |
1849 | } | |
1850 | ||
5df36e78 | 1851 | break; |
136d558c | 1852 | default: { |
136d558c | 1853 | int status; |
136d558c | 1854 | |
2283f8d6 TT |
1855 | if (nfs_parse_mount_options((char *)options, args) == 0) |
1856 | return -EINVAL; | |
136d558c | 1857 | |
4cfd74fc | 1858 | if (!nfs_verify_server_address(sap)) |
6e88e061 CL |
1859 | goto out_no_address; |
1860 | ||
764302cc CL |
1861 | if (args->version == 4) |
1862 | #ifdef CONFIG_NFS_V4 | |
1863 | return nfs4_validate_text_mount_data(options, | |
1864 | args, dev_name); | |
1865 | #else | |
1866 | goto out_v4_not_compiled; | |
1867 | #endif | |
1868 | ||
f5855fec | 1869 | nfs_set_port(sap, &args->nfs_server.port, 0); |
ed596a8a | 1870 | |
259875ef TM |
1871 | nfs_set_mount_transport_protocol(args); |
1872 | ||
dc045898 CL |
1873 | status = nfs_parse_devname(dev_name, |
1874 | &args->nfs_server.hostname, | |
1875 | PAGE_SIZE, | |
1876 | &args->nfs_server.export_path, | |
1877 | NFS_MAXPATHLEN); | |
1878 | if (!status) | |
1879 | status = nfs_try_mount(args, mntfh); | |
136d558c | 1880 | |
dc045898 CL |
1881 | kfree(args->nfs_server.export_path); |
1882 | args->nfs_server.export_path = NULL; | |
136d558c | 1883 | |
136d558c | 1884 | if (status) |
fdc6e2c8 | 1885 | return status; |
136d558c | 1886 | |
136d558c CL |
1887 | break; |
1888 | } | |
f7b422b1 | 1889 | } |
54ceac45 DH |
1890 | |
1891 | #ifndef CONFIG_NFS_V3 | |
8a6e5deb | 1892 | if (args->version == 3) |
5df36e78 CL |
1893 | goto out_v3_not_compiled; |
1894 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1895 | |
5df36e78 | 1896 | return 0; |
f7b422b1 | 1897 | |
5df36e78 CL |
1898 | out_no_data: |
1899 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1900 | return -EINVAL; | |
54ceac45 | 1901 | |
5df36e78 CL |
1902 | out_no_v3: |
1903 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1904 | data->version); | |
1905 | return -EINVAL; | |
f7b422b1 | 1906 | |
5df36e78 CL |
1907 | out_no_sec: |
1908 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1909 | return -EINVAL; | |
1910 | ||
5df36e78 CL |
1911 | #ifndef CONFIG_NFS_V3 |
1912 | out_v3_not_compiled: | |
1913 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1914 | return -EPROTONOSUPPORT; | |
1915 | #endif /* !CONFIG_NFS_V3 */ | |
1916 | ||
764302cc CL |
1917 | #ifndef CONFIG_NFS_V4 |
1918 | out_v4_not_compiled: | |
1919 | dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); | |
1920 | return -EPROTONOSUPPORT; | |
1921 | #endif /* !CONFIG_NFS_V4 */ | |
1922 | ||
63649bd7 CG |
1923 | out_nomem: |
1924 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
1925 | return -ENOMEM; | |
1926 | ||
5df36e78 CL |
1927 | out_no_address: |
1928 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
1929 | return -EINVAL; | |
1930 | ||
1931 | out_invalid_fh: | |
1932 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
1933 | return -EINVAL; | |
f7b422b1 DH |
1934 | } |
1935 | ||
48b605f8 JL |
1936 | static int |
1937 | nfs_compare_remount_data(struct nfs_server *nfss, | |
1938 | struct nfs_parsed_mount_data *data) | |
1939 | { | |
1940 | if (data->flags != nfss->flags || | |
1941 | data->rsize != nfss->rsize || | |
1942 | data->wsize != nfss->wsize || | |
1943 | data->retrans != nfss->client->cl_timeout->to_retries || | |
1944 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
1945 | data->acregmin != nfss->acregmin / HZ || | |
1946 | data->acregmax != nfss->acregmax / HZ || | |
1947 | data->acdirmin != nfss->acdirmin / HZ || | |
1948 | data->acdirmax != nfss->acdirmax / HZ || | |
1949 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
bcd2ea17 | 1950 | data->nfs_server.port != nfss->port || |
48b605f8 | 1951 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
a1be9eee SR |
1952 | !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
1953 | (struct sockaddr *)&nfss->nfs_client->cl_addr)) | |
48b605f8 JL |
1954 | return -EINVAL; |
1955 | ||
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | static int | |
1960 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
1961 | { | |
1962 | int error; | |
1963 | struct nfs_server *nfss = sb->s_fs_info; | |
1964 | struct nfs_parsed_mount_data *data; | |
1965 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
1966 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 1967 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
1968 | |
1969 | /* | |
1970 | * Userspace mount programs that send binary options generally send | |
1971 | * them populated with default values. We have no way to know which | |
1972 | * ones were explicitly specified. Fall back to legacy behavior and | |
1973 | * just return success. | |
1974 | */ | |
31c94469 MZ |
1975 | if ((nfsvers == 4 && (!options4 || options4->version == 1)) || |
1976 | (nfsvers <= 3 && (!options || (options->version >= 1 && | |
1977 | options->version <= 6)))) | |
48b605f8 JL |
1978 | return 0; |
1979 | ||
1980 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1981 | if (data == NULL) | |
1982 | return -ENOMEM; | |
1983 | ||
1984 | /* fill out struct with values from existing mount */ | |
1985 | data->flags = nfss->flags; | |
1986 | data->rsize = nfss->rsize; | |
1987 | data->wsize = nfss->wsize; | |
1988 | data->retrans = nfss->client->cl_timeout->to_retries; | |
1989 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
1990 | data->acregmin = nfss->acregmin / HZ; | |
1991 | data->acregmax = nfss->acregmax / HZ; | |
1992 | data->acdirmin = nfss->acdirmin / HZ; | |
1993 | data->acdirmax = nfss->acdirmax / HZ; | |
1994 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
bcd2ea17 | 1995 | data->nfs_server.port = nfss->port; |
48b605f8 JL |
1996 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
1997 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
1998 | data->nfs_server.addrlen); | |
1999 | ||
2000 | /* overwrite those values with any that were specified */ | |
2001 | error = nfs_parse_mount_options((char *)options, data); | |
2002 | if (error < 0) | |
2003 | goto out; | |
2004 | ||
26c4c170 JL |
2005 | /* |
2006 | * noac is a special case. It implies -o sync, but that's not | |
2007 | * necessarily reflected in the mtab options. do_remount_sb | |
2008 | * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the | |
2009 | * remount options, so we have to explicitly reset it. | |
2010 | */ | |
2011 | if (data->flags & NFS_MOUNT_NOAC) | |
2012 | *flags |= MS_SYNCHRONOUS; | |
2013 | ||
48b605f8 JL |
2014 | /* compare new mount options with old ones */ |
2015 | error = nfs_compare_remount_data(nfss, data); | |
2016 | out: | |
2017 | kfree(data); | |
2018 | return error; | |
2019 | } | |
2020 | ||
f7b422b1 | 2021 | /* |
54ceac45 | 2022 | * Initialise the common bits of the superblock |
f7b422b1 | 2023 | */ |
54ceac45 | 2024 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 2025 | { |
54ceac45 | 2026 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2027 | |
54ceac45 | 2028 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 2029 | |
54ceac45 DH |
2030 | /* We probably want something more informative here */ |
2031 | snprintf(sb->s_id, sizeof(sb->s_id), | |
2032 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 2033 | |
54ceac45 DH |
2034 | if (sb->s_blocksize == 0) |
2035 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
2036 | &sb->s_blocksize_bits); | |
f7b422b1 | 2037 | |
54ceac45 DH |
2038 | if (server->flags & NFS_MOUNT_NOAC) |
2039 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 2040 | |
32a88aa1 JA |
2041 | sb->s_bdi = &server->backing_dev_info; |
2042 | ||
54ceac45 | 2043 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
2044 | } |
2045 | ||
2046 | /* | |
54ceac45 | 2047 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 2048 | */ |
2283f8d6 TT |
2049 | static void nfs_fill_super(struct super_block *sb, |
2050 | struct nfs_parsed_mount_data *data) | |
f7b422b1 DH |
2051 | { |
2052 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 2053 | |
54ceac45 DH |
2054 | sb->s_blocksize_bits = 0; |
2055 | sb->s_blocksize = 0; | |
2056 | if (data->bsize) | |
2057 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 2058 | |
8a6e5deb | 2059 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2060 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2061 | * so ourselves when necessary. | |
2062 | */ | |
2063 | sb->s_flags |= MS_POSIXACL; | |
2064 | sb->s_time_gran = 1; | |
816724e6 | 2065 | } |
54ceac45 DH |
2066 | |
2067 | sb->s_op = &nfs_sops; | |
2068 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2069 | } |
2070 | ||
2071 | /* | |
54ceac45 | 2072 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 2073 | */ |
54ceac45 DH |
2074 | static void nfs_clone_super(struct super_block *sb, |
2075 | const struct super_block *old_sb) | |
f7b422b1 | 2076 | { |
54ceac45 DH |
2077 | struct nfs_server *server = NFS_SB(sb); |
2078 | ||
2079 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
2080 | sb->s_blocksize = old_sb->s_blocksize; | |
2081 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2082 | |
8a6e5deb | 2083 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2084 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2085 | * so ourselves when necessary. | |
f7b422b1 DH |
2086 | */ |
2087 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 2088 | sb->s_time_gran = 1; |
f7b422b1 DH |
2089 | } |
2090 | ||
54ceac45 DH |
2091 | sb->s_op = old_sb->s_op; |
2092 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2093 | } |
2094 | ||
275a5d24 TM |
2095 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) |
2096 | { | |
2097 | const struct nfs_server *a = s->s_fs_info; | |
2098 | const struct rpc_clnt *clnt_a = a->client; | |
2099 | const struct rpc_clnt *clnt_b = b->client; | |
2100 | ||
2101 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
2102 | goto Ebusy; | |
2103 | if (a->nfs_client != b->nfs_client) | |
2104 | goto Ebusy; | |
2105 | if (a->flags != b->flags) | |
2106 | goto Ebusy; | |
2107 | if (a->wsize != b->wsize) | |
2108 | goto Ebusy; | |
2109 | if (a->rsize != b->rsize) | |
2110 | goto Ebusy; | |
2111 | if (a->acregmin != b->acregmin) | |
2112 | goto Ebusy; | |
2113 | if (a->acregmax != b->acregmax) | |
2114 | goto Ebusy; | |
2115 | if (a->acdirmin != b->acdirmin) | |
2116 | goto Ebusy; | |
2117 | if (a->acdirmax != b->acdirmax) | |
2118 | goto Ebusy; | |
2119 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
2120 | goto Ebusy; | |
e89a5a43 | 2121 | return 1; |
275a5d24 | 2122 | Ebusy: |
e89a5a43 TM |
2123 | return 0; |
2124 | } | |
2125 | ||
2126 | struct nfs_sb_mountdata { | |
2127 | struct nfs_server *server; | |
2128 | int mntflags; | |
2129 | }; | |
2130 | ||
2131 | static int nfs_set_super(struct super_block *s, void *data) | |
2132 | { | |
2133 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2134 | struct nfs_server *server = sb_mntdata->server; | |
2135 | int ret; | |
2136 | ||
2137 | s->s_flags = sb_mntdata->mntflags; | |
2138 | s->s_fs_info = server; | |
8b244ff2 | 2139 | s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
e89a5a43 TM |
2140 | ret = set_anon_super(s, server); |
2141 | if (ret == 0) | |
2142 | server->s_dev = s->s_dev; | |
2143 | return ret; | |
2144 | } | |
2145 | ||
fd00a8ff CL |
2146 | static int nfs_compare_super_address(struct nfs_server *server1, |
2147 | struct nfs_server *server2) | |
2148 | { | |
2149 | struct sockaddr *sap1, *sap2; | |
2150 | ||
2151 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
2152 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
2153 | ||
2154 | if (sap1->sa_family != sap2->sa_family) | |
2155 | return 0; | |
2156 | ||
2157 | switch (sap1->sa_family) { | |
2158 | case AF_INET: { | |
2159 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
2160 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
2161 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
2162 | return 0; | |
2163 | if (sin1->sin_port != sin2->sin_port) | |
2164 | return 0; | |
2165 | break; | |
2166 | } | |
2167 | case AF_INET6: { | |
2168 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
2169 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
2170 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
2171 | return 0; | |
2172 | if (sin1->sin6_port != sin2->sin6_port) | |
2173 | return 0; | |
2174 | break; | |
2175 | } | |
2176 | default: | |
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | return 1; | |
2181 | } | |
2182 | ||
e89a5a43 TM |
2183 | static int nfs_compare_super(struct super_block *sb, void *data) |
2184 | { | |
2185 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2186 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
2187 | int mntflags = sb_mntdata->mntflags; | |
2188 | ||
fd00a8ff | 2189 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
2190 | return 0; |
2191 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
2192 | if (old->flags & NFS_MOUNT_UNSHARED) | |
2193 | return 0; | |
2194 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
2195 | return 0; | |
2196 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
2197 | } |
2198 | ||
fa799759 MS |
2199 | static int nfs_bdi_register(struct nfs_server *server) |
2200 | { | |
2201 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
2202 | } | |
2203 | ||
01194981 AV |
2204 | static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, |
2205 | int flags, const char *dev_name, void *raw_data) | |
f7b422b1 | 2206 | { |
f7b422b1 DH |
2207 | struct nfs_server *server = NULL; |
2208 | struct super_block *s; | |
33852a1f TM |
2209 | struct nfs_parsed_mount_data *data; |
2210 | struct nfs_fh *mntfh; | |
01194981 | 2211 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
75180df2 | 2212 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2213 | struct nfs_sb_mountdata sb_mntdata = { |
2214 | .mntflags = flags, | |
2215 | }; | |
01194981 | 2216 | int error; |
33852a1f | 2217 | |
1e657bd5 | 2218 | data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); |
b157b06c | 2219 | mntfh = nfs_alloc_fhandle(); |
33852a1f TM |
2220 | if (data == NULL || mntfh == NULL) |
2221 | goto out_free_fh; | |
f7b422b1 | 2222 | |
33852a1f | 2223 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 2224 | |
54ceac45 | 2225 | /* Validate the mount data */ |
33852a1f | 2226 | error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); |
01194981 AV |
2227 | if (error < 0) { |
2228 | mntroot = ERR_PTR(error); | |
0655960f | 2229 | goto out; |
01194981 | 2230 | } |
f7b422b1 | 2231 | |
764302cc CL |
2232 | #ifdef CONFIG_NFS_V4 |
2233 | if (data->version == 4) { | |
01194981 | 2234 | mntroot = nfs4_try_mount(flags, dev_name, data); |
764302cc | 2235 | kfree(data->client_address); |
9699eda6 | 2236 | kfree(data->nfs_server.export_path); |
764302cc CL |
2237 | goto out; |
2238 | } | |
2239 | #endif /* CONFIG_NFS_V4 */ | |
2240 | ||
54ceac45 | 2241 | /* Get a volume representation */ |
33852a1f | 2242 | server = nfs_create_server(data, mntfh); |
54ceac45 | 2243 | if (IS_ERR(server)) { |
01194981 | 2244 | mntroot = ERR_CAST(server); |
0655960f | 2245 | goto out; |
f7b422b1 | 2246 | } |
e89a5a43 | 2247 | sb_mntdata.server = server; |
f7b422b1 | 2248 | |
75180df2 TM |
2249 | if (server->flags & NFS_MOUNT_UNSHARED) |
2250 | compare_super = NULL; | |
2251 | ||
54ceac45 | 2252 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2253 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 | 2254 | if (IS_ERR(s)) { |
01194981 | 2255 | mntroot = ERR_CAST(s); |
54ceac45 | 2256 | goto out_err_nosb; |
816724e6 TM |
2257 | } |
2258 | ||
54ceac45 DH |
2259 | if (s->s_fs_info != server) { |
2260 | nfs_free_server(server); | |
2261 | server = NULL; | |
fa799759 MS |
2262 | } else { |
2263 | error = nfs_bdi_register(server); | |
01194981 AV |
2264 | if (error) { |
2265 | mntroot = ERR_PTR(error); | |
cfbc0683 | 2266 | goto error_splat_bdi; |
01194981 | 2267 | } |
54ceac45 | 2268 | } |
f7b422b1 | 2269 | |
54ceac45 DH |
2270 | if (!s->s_root) { |
2271 | /* initial superblock/root creation */ | |
33852a1f | 2272 | nfs_fill_super(s, data); |
160bc160 | 2273 | nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL); |
54ceac45 | 2274 | } |
f7b422b1 | 2275 | |
0d5839ad | 2276 | mntroot = nfs_get_root(s, mntfh, dev_name); |
01194981 | 2277 | if (IS_ERR(mntroot)) |
54ceac45 | 2278 | goto error_splat_super; |
816724e6 | 2279 | |
33852a1f | 2280 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
f9c3a380 EP |
2281 | if (error) |
2282 | goto error_splat_root; | |
2283 | ||
54ceac45 | 2284 | s->s_flags |= MS_ACTIVE; |
0655960f CL |
2285 | |
2286 | out: | |
33852a1f TM |
2287 | kfree(data->nfs_server.hostname); |
2288 | kfree(data->mount_server.hostname); | |
08734048 | 2289 | kfree(data->fscache_uniq); |
33852a1f TM |
2290 | security_free_mnt_opts(&data->lsm_opts); |
2291 | out_free_fh: | |
b157b06c | 2292 | nfs_free_fhandle(mntfh); |
33852a1f | 2293 | kfree(data); |
01194981 | 2294 | return mntroot; |
816724e6 | 2295 | |
54ceac45 DH |
2296 | out_err_nosb: |
2297 | nfs_free_server(server); | |
0655960f | 2298 | goto out; |
54ceac45 | 2299 | |
f9c3a380 EP |
2300 | error_splat_root: |
2301 | dput(mntroot); | |
01194981 | 2302 | mntroot = ERR_PTR(error); |
54ceac45 | 2303 | error_splat_super: |
cfbc0683 N |
2304 | if (server && !s->s_root) |
2305 | bdi_unregister(&server->backing_dev_info); | |
2306 | error_splat_bdi: | |
6f5bbff9 | 2307 | deactivate_locked_super(s); |
0655960f | 2308 | goto out; |
f7b422b1 DH |
2309 | } |
2310 | ||
387c149b TM |
2311 | /* |
2312 | * Ensure that we unregister the bdi before kill_anon_super | |
2313 | * releases the device name | |
2314 | */ | |
2315 | static void nfs_put_super(struct super_block *s) | |
2316 | { | |
2317 | struct nfs_server *server = NFS_SB(s); | |
2318 | ||
2319 | bdi_unregister(&server->backing_dev_info); | |
2320 | } | |
2321 | ||
54ceac45 DH |
2322 | /* |
2323 | * Destroy an NFS2/3 superblock | |
2324 | */ | |
f7b422b1 DH |
2325 | static void nfs_kill_super(struct super_block *s) |
2326 | { | |
2327 | struct nfs_server *server = NFS_SB(s); | |
2328 | ||
2329 | kill_anon_super(s); | |
08734048 | 2330 | nfs_fscache_release_super_cookie(s); |
54ceac45 | 2331 | nfs_free_server(server); |
f7b422b1 DH |
2332 | } |
2333 | ||
54ceac45 DH |
2334 | /* |
2335 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2336 | */ | |
31f43471 AV |
2337 | static struct dentry * |
2338 | nfs_xdev_mount(struct file_system_type *fs_type, int flags, | |
2339 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
2340 | { |
2341 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2342 | struct super_block *s; |
2343 | struct nfs_server *server; | |
2344 | struct dentry *mntroot; | |
75180df2 | 2345 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2346 | struct nfs_sb_mountdata sb_mntdata = { |
2347 | .mntflags = flags, | |
2348 | }; | |
54ceac45 | 2349 | int error; |
f7b422b1 | 2350 | |
31f43471 | 2351 | dprintk("--> nfs_xdev_mount()\n"); |
f7b422b1 | 2352 | |
54ceac45 DH |
2353 | /* create a new volume representation */ |
2354 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2355 | if (IS_ERR(server)) { | |
2356 | error = PTR_ERR(server); | |
2357 | goto out_err_noserver; | |
2358 | } | |
e89a5a43 | 2359 | sb_mntdata.server = server; |
8fa5c000 | 2360 | |
75180df2 TM |
2361 | if (server->flags & NFS_MOUNT_UNSHARED) |
2362 | compare_super = NULL; | |
2363 | ||
54ceac45 | 2364 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2365 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2366 | if (IS_ERR(s)) { |
2367 | error = PTR_ERR(s); | |
2368 | goto out_err_nosb; | |
2369 | } | |
5006a76c | 2370 | |
54ceac45 DH |
2371 | if (s->s_fs_info != server) { |
2372 | nfs_free_server(server); | |
2373 | server = NULL; | |
fa799759 MS |
2374 | } else { |
2375 | error = nfs_bdi_register(server); | |
2376 | if (error) | |
cfbc0683 | 2377 | goto error_splat_bdi; |
f7b422b1 | 2378 | } |
24c8dbbb | 2379 | |
54ceac45 DH |
2380 | if (!s->s_root) { |
2381 | /* initial superblock/root creation */ | |
54ceac45 | 2382 | nfs_clone_super(s, data->sb); |
2df54806 | 2383 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 | 2384 | } |
f7b422b1 | 2385 | |
0d5839ad | 2386 | mntroot = nfs_get_root(s, data->fh, dev_name); |
54ceac45 DH |
2387 | if (IS_ERR(mntroot)) { |
2388 | error = PTR_ERR(mntroot); | |
2389 | goto error_splat_super; | |
f7b422b1 | 2390 | } |
e9cc6c23 | 2391 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
4c1fe2f7 NB |
2392 | dput(mntroot); |
2393 | error = -ESTALE; | |
2394 | goto error_splat_super; | |
2395 | } | |
f7b422b1 | 2396 | |
54ceac45 | 2397 | s->s_flags |= MS_ACTIVE; |
f7b422b1 | 2398 | |
f9c3a380 EP |
2399 | /* clone any lsm security options from the parent to the new sb */ |
2400 | security_sb_clone_mnt_opts(data->sb, s); | |
2401 | ||
31f43471 AV |
2402 | dprintk("<-- nfs_xdev_mount() = 0\n"); |
2403 | return mntroot; | |
24c8dbbb | 2404 | |
54ceac45 DH |
2405 | out_err_nosb: |
2406 | nfs_free_server(server); | |
2407 | out_err_noserver: | |
31f43471 AV |
2408 | dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); |
2409 | return ERR_PTR(error); | |
f7b422b1 | 2410 | |
54ceac45 | 2411 | error_splat_super: |
cfbc0683 N |
2412 | if (server && !s->s_root) |
2413 | bdi_unregister(&server->backing_dev_info); | |
2414 | error_splat_bdi: | |
6f5bbff9 | 2415 | deactivate_locked_super(s); |
31f43471 AV |
2416 | dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); |
2417 | return ERR_PTR(error); | |
f7b422b1 DH |
2418 | } |
2419 | ||
54ceac45 DH |
2420 | #ifdef CONFIG_NFS_V4 |
2421 | ||
f7b422b1 | 2422 | /* |
54ceac45 | 2423 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2424 | */ |
54ceac45 DH |
2425 | static void nfs4_clone_super(struct super_block *sb, |
2426 | const struct super_block *old_sb) | |
f7b422b1 | 2427 | { |
54ceac45 DH |
2428 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2429 | sb->s_blocksize = old_sb->s_blocksize; | |
2430 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2431 | sb->s_time_gran = 1; |
54ceac45 | 2432 | sb->s_op = old_sb->s_op; |
a8a5da99 AK |
2433 | /* |
2434 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2435 | * so ourselves when necessary. | |
2436 | */ | |
2437 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b AK |
2438 | sb->s_xattr = old_sb->s_xattr; |
2439 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2440 | } |
2441 | ||
54ceac45 DH |
2442 | /* |
2443 | * Set up an NFS4 superblock | |
2444 | */ | |
2445 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 2446 | { |
54ceac45 DH |
2447 | sb->s_time_gran = 1; |
2448 | sb->s_op = &nfs4_sops; | |
a8a5da99 AK |
2449 | /* |
2450 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2451 | * so ourselves when necessary. | |
2452 | */ | |
2453 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b | 2454 | sb->s_xattr = nfs4_xattr_handlers; |
54ceac45 | 2455 | nfs_initialise_sb(sb); |
f7b422b1 DH |
2456 | } |
2457 | ||
01c3f052 TM |
2458 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
2459 | { | |
5eebde23 SJ |
2460 | args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
2461 | NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); | |
01c3f052 TM |
2462 | } |
2463 | ||
7630c852 CL |
2464 | static int nfs4_validate_text_mount_data(void *options, |
2465 | struct nfs_parsed_mount_data *args, | |
2466 | const char *dev_name) | |
2467 | { | |
2468 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; | |
2469 | ||
f5855fec | 2470 | nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); |
7630c852 CL |
2471 | |
2472 | nfs_validate_transport_protocol(args); | |
2473 | ||
2474 | nfs4_validate_mount_flags(args); | |
2475 | ||
2ecda72b TM |
2476 | if (args->version != 4) { |
2477 | dfprintk(MOUNT, | |
2478 | "NFS4: Illegal mount version\n"); | |
2479 | return -EINVAL; | |
2480 | } | |
2481 | ||
7630c852 CL |
2482 | if (args->auth_flavor_len > 1) { |
2483 | dfprintk(MOUNT, | |
2484 | "NFS4: Too many RPC auth flavours specified\n"); | |
2485 | return -EINVAL; | |
2486 | } | |
2487 | ||
2488 | if (args->client_address == NULL) { | |
2489 | dfprintk(MOUNT, | |
2490 | "NFS4: mount program didn't pass callback address\n"); | |
2491 | return -EINVAL; | |
2492 | } | |
2493 | ||
2494 | return nfs_parse_devname(dev_name, | |
2495 | &args->nfs_server.hostname, | |
2496 | NFS4_MAXNAMLEN, | |
2497 | &args->nfs_server.export_path, | |
2498 | NFS4_MAXPATHLEN); | |
2499 | } | |
2500 | ||
f0768ebd CL |
2501 | /* |
2502 | * Validate NFSv4 mount options | |
2503 | */ | |
91ea40b9 TT |
2504 | static int nfs4_validate_mount_data(void *options, |
2505 | struct nfs_parsed_mount_data *args, | |
2506 | const char *dev_name) | |
f0768ebd | 2507 | { |
4cfd74fc | 2508 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
91ea40b9 | 2509 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2510 | char *c; |
2511 | ||
2512 | if (data == NULL) | |
2513 | goto out_no_data; | |
2514 | ||
2515 | switch (data->version) { | |
2516 | case 1: | |
4c568017 CL |
2517 | if (data->host_addrlen > sizeof(args->nfs_server.address)) |
2518 | goto out_no_address; | |
2519 | if (data->host_addrlen == 0) | |
f0768ebd | 2520 | goto out_no_address; |
4c568017 | 2521 | args->nfs_server.addrlen = data->host_addrlen; |
4cfd74fc | 2522 | if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
f0768ebd | 2523 | return -EFAULT; |
4cfd74fc | 2524 | if (!nfs_verify_server_address(sap)) |
f0768ebd CL |
2525 | goto out_no_address; |
2526 | ||
6738b251 CL |
2527 | if (data->auth_flavourlen) { |
2528 | if (data->auth_flavourlen > 1) | |
2529 | goto out_inval_auth; | |
20c71f5e | 2530 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2531 | data->auth_flavours, |
20c71f5e | 2532 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2533 | return -EFAULT; |
f0768ebd CL |
2534 | } |
2535 | ||
2536 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2537 | if (IS_ERR(c)) | |
2538 | return PTR_ERR(c); | |
91ea40b9 | 2539 | args->nfs_server.hostname = c; |
f0768ebd CL |
2540 | |
2541 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2542 | if (IS_ERR(c)) | |
2543 | return PTR_ERR(c); | |
91ea40b9 TT |
2544 | args->nfs_server.export_path = c; |
2545 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2546 | |
2547 | c = strndup_user(data->client_addr.data, 16); | |
2548 | if (IS_ERR(c)) | |
2549 | return PTR_ERR(c); | |
91ea40b9 TT |
2550 | args->client_address = c; |
2551 | ||
2552 | /* | |
2553 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2554 | * can deal with. | |
2555 | */ | |
2556 | ||
2557 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2558 | args->rsize = data->rsize; | |
2559 | args->wsize = data->wsize; | |
2560 | args->timeo = data->timeo; | |
2561 | args->retrans = data->retrans; | |
2562 | args->acregmin = data->acregmin; | |
2563 | args->acregmax = data->acregmax; | |
2564 | args->acdirmin = data->acdirmin; | |
2565 | args->acdirmax = data->acdirmax; | |
2566 | args->nfs_server.protocol = data->proto; | |
259875ef | 2567 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2568 | |
2569 | break; | |
7630c852 | 2570 | default: |
91ea40b9 | 2571 | if (nfs_parse_mount_options((char *)options, args) == 0) |
80071225 CL |
2572 | return -EINVAL; |
2573 | ||
4cfd74fc | 2574 | if (!nfs_verify_server_address(sap)) |
80071225 | 2575 | return -EINVAL; |
dc045898 | 2576 | |
7630c852 | 2577 | return nfs4_validate_text_mount_data(options, args, dev_name); |
f0768ebd CL |
2578 | } |
2579 | ||
2580 | return 0; | |
2581 | ||
2582 | out_no_data: | |
2583 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2584 | return -EINVAL; | |
2585 | ||
2586 | out_inval_auth: | |
2587 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2588 | data->auth_flavourlen); | |
2589 | return -EINVAL; | |
2590 | ||
2591 | out_no_address: | |
2592 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2593 | return -EINVAL; | |
f0768ebd CL |
2594 | } |
2595 | ||
54ceac45 | 2596 | /* |
c02d7adf | 2597 | * Get the superblock for the NFS4 root partition |
54ceac45 | 2598 | */ |
31f43471 AV |
2599 | static struct dentry * |
2600 | nfs4_remote_mount(struct file_system_type *fs_type, int flags, | |
2601 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2602 | { |
c02d7adf | 2603 | struct nfs_parsed_mount_data *data = raw_data; |
54ceac45 DH |
2604 | struct super_block *s; |
2605 | struct nfs_server *server; | |
33852a1f | 2606 | struct nfs_fh *mntfh; |
54ceac45 | 2607 | struct dentry *mntroot; |
75180df2 | 2608 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2609 | struct nfs_sb_mountdata sb_mntdata = { |
2610 | .mntflags = flags, | |
2611 | }; | |
33852a1f TM |
2612 | int error = -ENOMEM; |
2613 | ||
b157b06c | 2614 | mntfh = nfs_alloc_fhandle(); |
33852a1f TM |
2615 | if (data == NULL || mntfh == NULL) |
2616 | goto out_free_fh; | |
f7b422b1 | 2617 | |
33852a1f | 2618 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 2619 | |
54ceac45 | 2620 | /* Get a volume representation */ |
33852a1f | 2621 | server = nfs4_create_server(data, mntfh); |
54ceac45 DH |
2622 | if (IS_ERR(server)) { |
2623 | error = PTR_ERR(server); | |
29eb981a | 2624 | goto out; |
f7b422b1 | 2625 | } |
e89a5a43 | 2626 | sb_mntdata.server = server; |
f7b422b1 | 2627 | |
75180df2 TM |
2628 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2629 | compare_super = NULL; | |
2630 | ||
54ceac45 | 2631 | /* Get a superblock - note that we may end up sharing one that already exists */ |
c02d7adf | 2632 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
2633 | if (IS_ERR(s)) { |
2634 | error = PTR_ERR(s); | |
f7b422b1 | 2635 | goto out_free; |
816724e6 TM |
2636 | } |
2637 | ||
5dd3177a TM |
2638 | if (s->s_fs_info != server) { |
2639 | nfs_free_server(server); | |
2640 | server = NULL; | |
fa799759 MS |
2641 | } else { |
2642 | error = nfs_bdi_register(server); | |
2643 | if (error) | |
cfbc0683 | 2644 | goto error_splat_bdi; |
5dd3177a TM |
2645 | } |
2646 | ||
54ceac45 DH |
2647 | if (!s->s_root) { |
2648 | /* initial superblock/root creation */ | |
54ceac45 | 2649 | nfs4_fill_super(s); |
2df54806 DH |
2650 | nfs_fscache_get_super_cookie( |
2651 | s, data ? data->fscache_uniq : NULL, NULL); | |
54ceac45 | 2652 | } |
f7b422b1 | 2653 | |
0d5839ad | 2654 | mntroot = nfs4_get_root(s, mntfh, dev_name); |
54ceac45 DH |
2655 | if (IS_ERR(mntroot)) { |
2656 | error = PTR_ERR(mntroot); | |
2657 | goto error_splat_super; | |
f7b422b1 | 2658 | } |
54ceac45 | 2659 | |
33852a1f | 2660 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
46c8ac74 EP |
2661 | if (error) |
2662 | goto error_splat_root; | |
2663 | ||
f7b422b1 | 2664 | s->s_flags |= MS_ACTIVE; |
31f43471 AV |
2665 | |
2666 | security_free_mnt_opts(&data->lsm_opts); | |
2667 | nfs_free_fhandle(mntfh); | |
2668 | return mntroot; | |
29eb981a CL |
2669 | |
2670 | out: | |
33852a1f TM |
2671 | security_free_mnt_opts(&data->lsm_opts); |
2672 | out_free_fh: | |
b157b06c | 2673 | nfs_free_fhandle(mntfh); |
31f43471 | 2674 | return ERR_PTR(error); |
54ceac45 | 2675 | |
f7b422b1 | 2676 | out_free: |
54ceac45 | 2677 | nfs_free_server(server); |
29eb981a | 2678 | goto out; |
54ceac45 | 2679 | |
46c8ac74 EP |
2680 | error_splat_root: |
2681 | dput(mntroot); | |
54ceac45 | 2682 | error_splat_super: |
cfbc0683 N |
2683 | if (server && !s->s_root) |
2684 | bdi_unregister(&server->backing_dev_info); | |
2685 | error_splat_bdi: | |
6f5bbff9 | 2686 | deactivate_locked_super(s); |
29eb981a | 2687 | goto out; |
f7b422b1 DH |
2688 | } |
2689 | ||
c02d7adf TM |
2690 | static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
2691 | int flags, void *data, const char *hostname) | |
2692 | { | |
2693 | struct vfsmount *root_mnt; | |
2694 | char *root_devname; | |
2695 | size_t len; | |
2696 | ||
2697 | len = strlen(hostname) + 3; | |
2698 | root_devname = kmalloc(len, GFP_KERNEL); | |
2699 | if (root_devname == NULL) | |
2700 | return ERR_PTR(-ENOMEM); | |
2701 | snprintf(root_devname, len, "%s:/", hostname); | |
2702 | root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); | |
2703 | kfree(root_devname); | |
2704 | return root_mnt; | |
2705 | } | |
2706 | ||
ce587e07 TM |
2707 | struct nfs_referral_count { |
2708 | struct list_head list; | |
2709 | const struct task_struct *task; | |
2710 | unsigned int referral_count; | |
2711 | }; | |
2712 | ||
2713 | static LIST_HEAD(nfs_referral_count_list); | |
2714 | static DEFINE_SPINLOCK(nfs_referral_count_list_lock); | |
2715 | ||
2716 | static struct nfs_referral_count *nfs_find_referral_count(void) | |
2717 | { | |
2718 | struct nfs_referral_count *p; | |
2719 | ||
2720 | list_for_each_entry(p, &nfs_referral_count_list, list) { | |
2721 | if (p->task == current) | |
2722 | return p; | |
2723 | } | |
2724 | return NULL; | |
2725 | } | |
2726 | ||
2727 | #define NFS_MAX_NESTED_REFERRALS 2 | |
2728 | ||
2729 | static int nfs_referral_loop_protect(void) | |
2730 | { | |
2731 | struct nfs_referral_count *p, *new; | |
2732 | int ret = -ENOMEM; | |
2733 | ||
2734 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2735 | if (!new) | |
2736 | goto out; | |
2737 | new->task = current; | |
2738 | new->referral_count = 1; | |
2739 | ||
2740 | ret = 0; | |
2741 | spin_lock(&nfs_referral_count_list_lock); | |
2742 | p = nfs_find_referral_count(); | |
2743 | if (p != NULL) { | |
2744 | if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) | |
2745 | ret = -ELOOP; | |
2746 | else | |
2747 | p->referral_count++; | |
2748 | } else { | |
2749 | list_add(&new->list, &nfs_referral_count_list); | |
2750 | new = NULL; | |
2751 | } | |
2752 | spin_unlock(&nfs_referral_count_list_lock); | |
2753 | kfree(new); | |
2754 | out: | |
2755 | return ret; | |
2756 | } | |
2757 | ||
2758 | static void nfs_referral_loop_unprotect(void) | |
2759 | { | |
2760 | struct nfs_referral_count *p; | |
2761 | ||
2762 | spin_lock(&nfs_referral_count_list_lock); | |
2763 | p = nfs_find_referral_count(); | |
2764 | p->referral_count--; | |
2765 | if (p->referral_count == 0) | |
2766 | list_del(&p->list); | |
2767 | else | |
2768 | p = NULL; | |
2769 | spin_unlock(&nfs_referral_count_list_lock); | |
2770 | kfree(p); | |
2771 | } | |
2772 | ||
01194981 AV |
2773 | static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, |
2774 | const char *export_path) | |
c02d7adf | 2775 | { |
04ffdbe2 | 2776 | struct nameidata *nd = NULL; |
a2770d86 | 2777 | struct mnt_namespace *ns_private; |
c02d7adf | 2778 | struct super_block *s; |
01194981 | 2779 | struct dentry *dentry; |
c02d7adf TM |
2780 | int ret; |
2781 | ||
04ffdbe2 TM |
2782 | nd = kmalloc(sizeof(*nd), GFP_KERNEL); |
2783 | if (nd == NULL) | |
01194981 | 2784 | return ERR_PTR(-ENOMEM); |
04ffdbe2 | 2785 | |
a2770d86 LT |
2786 | ns_private = create_mnt_ns(root_mnt); |
2787 | ret = PTR_ERR(ns_private); | |
2788 | if (IS_ERR(ns_private)) | |
2789 | goto out_mntput; | |
2790 | ||
ce587e07 TM |
2791 | ret = nfs_referral_loop_protect(); |
2792 | if (ret != 0) | |
2793 | goto out_put_mnt_ns; | |
2794 | ||
c02d7adf | 2795 | ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, |
04ffdbe2 | 2796 | export_path, LOOKUP_FOLLOW, nd); |
c02d7adf | 2797 | |
ce587e07 | 2798 | nfs_referral_loop_unprotect(); |
a2770d86 LT |
2799 | put_mnt_ns(ns_private); |
2800 | ||
c02d7adf TM |
2801 | if (ret != 0) |
2802 | goto out_err; | |
2803 | ||
04ffdbe2 | 2804 | s = nd->path.mnt->mnt_sb; |
c02d7adf | 2805 | atomic_inc(&s->s_active); |
01194981 | 2806 | dentry = dget(nd->path.dentry); |
c02d7adf | 2807 | |
04ffdbe2 TM |
2808 | path_put(&nd->path); |
2809 | kfree(nd); | |
c02d7adf | 2810 | down_write(&s->s_umount); |
01194981 | 2811 | return dentry; |
ce587e07 TM |
2812 | out_put_mnt_ns: |
2813 | put_mnt_ns(ns_private); | |
c02d7adf TM |
2814 | out_mntput: |
2815 | mntput(root_mnt); | |
2816 | out_err: | |
04ffdbe2 | 2817 | kfree(nd); |
01194981 | 2818 | return ERR_PTR(ret); |
c02d7adf TM |
2819 | } |
2820 | ||
01194981 AV |
2821 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
2822 | struct nfs_parsed_mount_data *data) | |
a6fe23be CL |
2823 | { |
2824 | char *export_path; | |
2825 | struct vfsmount *root_mnt; | |
01194981 | 2826 | struct dentry *res; |
a6fe23be CL |
2827 | |
2828 | dfprintk(MOUNT, "--> nfs4_try_mount()\n"); | |
2829 | ||
2830 | export_path = data->nfs_server.export_path; | |
2831 | data->nfs_server.export_path = "/"; | |
2832 | root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, | |
2833 | data->nfs_server.hostname); | |
2834 | data->nfs_server.export_path = export_path; | |
2835 | ||
01194981 AV |
2836 | res = ERR_CAST(root_mnt); |
2837 | if (!IS_ERR(root_mnt)) | |
2838 | res = nfs_follow_remote_path(root_mnt, export_path); | |
a6fe23be | 2839 | |
01194981 AV |
2840 | dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", |
2841 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
2842 | IS_ERR(res) ? " [error]" : ""); | |
2843 | return res; | |
a6fe23be CL |
2844 | } |
2845 | ||
c02d7adf TM |
2846 | /* |
2847 | * Get the superblock for an NFS4 mountpoint | |
2848 | */ | |
01194981 AV |
2849 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, |
2850 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
2851 | { |
2852 | struct nfs_parsed_mount_data *data; | |
c02d7adf | 2853 | int error = -ENOMEM; |
01194981 | 2854 | struct dentry *res = ERR_PTR(-ENOMEM); |
c02d7adf | 2855 | |
c5811dbd | 2856 | data = nfs_alloc_parsed_mount_data(4); |
c02d7adf TM |
2857 | if (data == NULL) |
2858 | goto out_free_data; | |
2859 | ||
2860 | /* Validate the mount data */ | |
2861 | error = nfs4_validate_mount_data(raw_data, data, dev_name); | |
01194981 AV |
2862 | if (error < 0) { |
2863 | res = ERR_PTR(error); | |
c02d7adf | 2864 | goto out; |
01194981 | 2865 | } |
c02d7adf | 2866 | |
01194981 AV |
2867 | res = nfs4_try_mount(flags, dev_name, data); |
2868 | if (IS_ERR(res)) | |
2869 | error = PTR_ERR(res); | |
c02d7adf TM |
2870 | |
2871 | out: | |
2872 | kfree(data->client_address); | |
2873 | kfree(data->nfs_server.export_path); | |
2874 | kfree(data->nfs_server.hostname); | |
2875 | kfree(data->fscache_uniq); | |
2876 | out_free_data: | |
2877 | kfree(data); | |
01194981 | 2878 | dprintk("<-- nfs4_mount() = %d%s\n", error, |
c02d7adf | 2879 | error != 0 ? " [error]" : ""); |
01194981 | 2880 | return res; |
c02d7adf TM |
2881 | } |
2882 | ||
f7b422b1 DH |
2883 | static void nfs4_kill_super(struct super_block *sb) |
2884 | { | |
2885 | struct nfs_server *server = NFS_SB(sb); | |
2886 | ||
0f3e66c6 | 2887 | dprintk("--> %s\n", __func__); |
515d8611 | 2888 | nfs_super_return_all_delegations(sb); |
f7b422b1 | 2889 | kill_anon_super(sb); |
08734048 | 2890 | nfs_fscache_release_super_cookie(sb); |
54ceac45 | 2891 | nfs_free_server(server); |
0f3e66c6 | 2892 | dprintk("<-- %s\n", __func__); |
f7b422b1 DH |
2893 | } |
2894 | ||
2895 | /* | |
54ceac45 | 2896 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2897 | */ |
31f43471 AV |
2898 | static struct dentry * |
2899 | nfs4_xdev_mount(struct file_system_type *fs_type, int flags, | |
2900 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2901 | { |
54ceac45 DH |
2902 | struct nfs_clone_mount *data = raw_data; |
2903 | struct super_block *s; | |
2904 | struct nfs_server *server; | |
2905 | struct dentry *mntroot; | |
75180df2 | 2906 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2907 | struct nfs_sb_mountdata sb_mntdata = { |
2908 | .mntflags = flags, | |
2909 | }; | |
54ceac45 | 2910 | int error; |
f7b422b1 | 2911 | |
31f43471 | 2912 | dprintk("--> nfs4_xdev_mount()\n"); |
f7b422b1 | 2913 | |
54ceac45 DH |
2914 | /* create a new volume representation */ |
2915 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2916 | if (IS_ERR(server)) { | |
2917 | error = PTR_ERR(server); | |
2918 | goto out_err_noserver; | |
f7b422b1 | 2919 | } |
e89a5a43 | 2920 | sb_mntdata.server = server; |
f7b422b1 | 2921 | |
75180df2 TM |
2922 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2923 | compare_super = NULL; | |
2924 | ||
54ceac45 | 2925 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 2926 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2927 | if (IS_ERR(s)) { |
2928 | error = PTR_ERR(s); | |
2929 | goto out_err_nosb; | |
f7b422b1 | 2930 | } |
f7b422b1 | 2931 | |
54ceac45 DH |
2932 | if (s->s_fs_info != server) { |
2933 | nfs_free_server(server); | |
2934 | server = NULL; | |
fa799759 MS |
2935 | } else { |
2936 | error = nfs_bdi_register(server); | |
2937 | if (error) | |
cfbc0683 | 2938 | goto error_splat_bdi; |
54ceac45 | 2939 | } |
f7b422b1 | 2940 | |
54ceac45 DH |
2941 | if (!s->s_root) { |
2942 | /* initial superblock/root creation */ | |
54ceac45 | 2943 | nfs4_clone_super(s, data->sb); |
2df54806 | 2944 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 | 2945 | } |
f7b422b1 | 2946 | |
0d5839ad | 2947 | mntroot = nfs4_get_root(s, data->fh, dev_name); |
54ceac45 DH |
2948 | if (IS_ERR(mntroot)) { |
2949 | error = PTR_ERR(mntroot); | |
2950 | goto error_splat_super; | |
2951 | } | |
e9cc6c23 TM |
2952 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
2953 | dput(mntroot); | |
2954 | error = -ESTALE; | |
2955 | goto error_splat_super; | |
2956 | } | |
f7b422b1 | 2957 | |
54ceac45 | 2958 | s->s_flags |= MS_ACTIVE; |
54ceac45 | 2959 | |
46c8ac74 EP |
2960 | security_sb_clone_mnt_opts(data->sb, s); |
2961 | ||
31f43471 AV |
2962 | dprintk("<-- nfs4_xdev_mount() = 0\n"); |
2963 | return mntroot; | |
54ceac45 DH |
2964 | |
2965 | out_err_nosb: | |
2966 | nfs_free_server(server); | |
2967 | out_err_noserver: | |
31f43471 AV |
2968 | dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); |
2969 | return ERR_PTR(error); | |
54ceac45 DH |
2970 | |
2971 | error_splat_super: | |
cfbc0683 N |
2972 | if (server && !s->s_root) |
2973 | bdi_unregister(&server->backing_dev_info); | |
2974 | error_splat_bdi: | |
6f5bbff9 | 2975 | deactivate_locked_super(s); |
31f43471 AV |
2976 | dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); |
2977 | return ERR_PTR(error); | |
f7b422b1 DH |
2978 | } |
2979 | ||
31f43471 AV |
2980 | static struct dentry * |
2981 | nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, | |
2982 | const char *dev_name, void *raw_data) | |
f7b422b1 DH |
2983 | { |
2984 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2985 | struct super_block *s; |
2986 | struct nfs_server *server; | |
2987 | struct dentry *mntroot; | |
4f727296 | 2988 | struct nfs_fh *mntfh; |
75180df2 | 2989 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2990 | struct nfs_sb_mountdata sb_mntdata = { |
2991 | .mntflags = flags, | |
2992 | }; | |
4f727296 | 2993 | int error = -ENOMEM; |
54ceac45 DH |
2994 | |
2995 | dprintk("--> nfs4_referral_get_sb()\n"); | |
2996 | ||
4f727296 TM |
2997 | mntfh = nfs_alloc_fhandle(); |
2998 | if (mntfh == NULL) | |
2999 | goto out_err_nofh; | |
3000 | ||
54ceac45 | 3001 | /* create a new volume representation */ |
4f727296 | 3002 | server = nfs4_create_referral_server(data, mntfh); |
54ceac45 DH |
3003 | if (IS_ERR(server)) { |
3004 | error = PTR_ERR(server); | |
3005 | goto out_err_noserver; | |
3006 | } | |
e89a5a43 | 3007 | sb_mntdata.server = server; |
54ceac45 | 3008 | |
75180df2 TM |
3009 | if (server->flags & NFS4_MOUNT_UNSHARED) |
3010 | compare_super = NULL; | |
3011 | ||
54ceac45 | 3012 | /* Get a superblock - note that we may end up sharing one that already exists */ |
ec9a05c9 | 3013 | s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
3014 | if (IS_ERR(s)) { |
3015 | error = PTR_ERR(s); | |
3016 | goto out_err_nosb; | |
3017 | } | |
3018 | ||
3019 | if (s->s_fs_info != server) { | |
3020 | nfs_free_server(server); | |
3021 | server = NULL; | |
fa799759 MS |
3022 | } else { |
3023 | error = nfs_bdi_register(server); | |
3024 | if (error) | |
cfbc0683 | 3025 | goto error_splat_bdi; |
54ceac45 DH |
3026 | } |
3027 | ||
3028 | if (!s->s_root) { | |
3029 | /* initial superblock/root creation */ | |
54ceac45 | 3030 | nfs4_fill_super(s); |
2df54806 | 3031 | nfs_fscache_get_super_cookie(s, NULL, data); |
54ceac45 DH |
3032 | } |
3033 | ||
0d5839ad | 3034 | mntroot = nfs4_get_root(s, mntfh, dev_name); |
54ceac45 DH |
3035 | if (IS_ERR(mntroot)) { |
3036 | error = PTR_ERR(mntroot); | |
3037 | goto error_splat_super; | |
3038 | } | |
e9cc6c23 TM |
3039 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
3040 | dput(mntroot); | |
3041 | error = -ESTALE; | |
3042 | goto error_splat_super; | |
3043 | } | |
54ceac45 DH |
3044 | |
3045 | s->s_flags |= MS_ACTIVE; | |
54ceac45 | 3046 | |
46c8ac74 EP |
3047 | security_sb_clone_mnt_opts(data->sb, s); |
3048 | ||
4f727296 | 3049 | nfs_free_fhandle(mntfh); |
54ceac45 | 3050 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); |
31f43471 | 3051 | return mntroot; |
54ceac45 DH |
3052 | |
3053 | out_err_nosb: | |
3054 | nfs_free_server(server); | |
3055 | out_err_noserver: | |
4f727296 TM |
3056 | nfs_free_fhandle(mntfh); |
3057 | out_err_nofh: | |
54ceac45 | 3058 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); |
31f43471 | 3059 | return ERR_PTR(error); |
54ceac45 DH |
3060 | |
3061 | error_splat_super: | |
cfbc0683 N |
3062 | if (server && !s->s_root) |
3063 | bdi_unregister(&server->backing_dev_info); | |
3064 | error_splat_bdi: | |
6f5bbff9 | 3065 | deactivate_locked_super(s); |
4f727296 | 3066 | nfs_free_fhandle(mntfh); |
54ceac45 | 3067 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); |
31f43471 | 3068 | return ERR_PTR(error); |
f7b422b1 DH |
3069 | } |
3070 | ||
c02d7adf TM |
3071 | /* |
3072 | * Create an NFS4 server record on referral traversal | |
3073 | */ | |
01194981 AV |
3074 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
3075 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
3076 | { |
3077 | struct nfs_clone_mount *data = raw_data; | |
3078 | char *export_path; | |
3079 | struct vfsmount *root_mnt; | |
01194981 | 3080 | struct dentry *res; |
c02d7adf | 3081 | |
01194981 | 3082 | dprintk("--> nfs4_referral_mount()\n"); |
c02d7adf TM |
3083 | |
3084 | export_path = data->mnt_path; | |
3085 | data->mnt_path = "/"; | |
3086 | ||
3087 | root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, | |
3088 | flags, data, data->hostname); | |
3089 | data->mnt_path = export_path; | |
3090 | ||
01194981 AV |
3091 | res = ERR_CAST(root_mnt); |
3092 | if (!IS_ERR(root_mnt)) | |
3093 | res = nfs_follow_remote_path(root_mnt, export_path); | |
3094 | dprintk("<-- nfs4_referral_mount() = %ld%s\n", | |
3095 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
3096 | IS_ERR(res) ? " [error]" : ""); | |
3097 | return res; | |
c02d7adf TM |
3098 | } |
3099 | ||
54ceac45 | 3100 | #endif /* CONFIG_NFS_V4 */ |