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Commit | Line | Data |
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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
526719ba | 8 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
f7b422b1 DH |
9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
10 | * | |
11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. | |
12 | * J.S.Peatfield@damtp.cam.ac.uk | |
13 | * | |
14 | * Split from inode.c by David Howells <dhowells@redhat.com> | |
15 | * | |
54ceac45 DH |
16 | * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
17 | * particular server are held in the same superblock | |
18 | * - NFS superblocks can have several effective roots to the dentry tree | |
19 | * - directory type roots are spliced into the tree when a path from one root reaches the root | |
20 | * of another (see nfs_lookup()) | |
f7b422b1 DH |
21 | */ |
22 | ||
f7b422b1 DH |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | ||
26 | #include <linux/time.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
34 | #include <linux/sunrpc/stats.h> | |
35 | #include <linux/sunrpc/metrics.h> | |
0896a725 | 36 | #include <linux/sunrpc/xprtsock.h> |
2cf7ff7a | 37 | #include <linux/sunrpc/xprtrdma.h> |
f7b422b1 DH |
38 | #include <linux/nfs_fs.h> |
39 | #include <linux/nfs_mount.h> | |
40 | #include <linux/nfs4_mount.h> | |
41 | #include <linux/lockd/bind.h> | |
f7b422b1 DH |
42 | #include <linux/seq_file.h> |
43 | #include <linux/mount.h> | |
c02d7adf | 44 | #include <linux/namei.h> |
f7b422b1 DH |
45 | #include <linux/nfs_idmap.h> |
46 | #include <linux/vfs.h> | |
47 | #include <linux/inet.h> | |
fd00a8ff | 48 | #include <linux/in6.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
fd00a8ff | 50 | #include <net/ipv6.h> |
d8e7748a | 51 | #include <linux/netdevice.h> |
f7b422b1 | 52 | #include <linux/nfs_xdr.h> |
b5d5dfbd | 53 | #include <linux/magic.h> |
bf0fd768 | 54 | #include <linux/parser.h> |
e50a7a1a | 55 | #include <linux/nsproxy.h> |
2446ab60 | 56 | #include <linux/rcupdate.h> |
f7b422b1 | 57 | |
f7b422b1 DH |
58 | #include <asm/uaccess.h> |
59 | ||
60 | #include "nfs4_fs.h" | |
61 | #include "callback.h" | |
62 | #include "delegation.h" | |
63 | #include "iostat.h" | |
64 | #include "internal.h" | |
08734048 | 65 | #include "fscache.h" |
ae50c0b5 | 66 | #include "pnfs.h" |
f7b422b1 DH |
67 | |
68 | #define NFSDBG_FACILITY NFSDBG_VFS | |
b72e4f42 | 69 | #define NFS_TEXT_DATA 1 |
f7b422b1 | 70 | |
1e657bd5 PZ |
71 | #ifdef CONFIG_NFS_V3 |
72 | #define NFS_DEFAULT_VERSION 3 | |
73 | #else | |
74 | #define NFS_DEFAULT_VERSION 2 | |
75 | #endif | |
76 | ||
bf0fd768 CL |
77 | enum { |
78 | /* Mount options that take no arguments */ | |
79 | Opt_soft, Opt_hard, | |
bf0fd768 CL |
80 | Opt_posix, Opt_noposix, |
81 | Opt_cto, Opt_nocto, | |
82 | Opt_ac, Opt_noac, | |
83 | Opt_lock, Opt_nolock, | |
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, |
3fd5be9e | 101 | Opt_minorversion, |
bf0fd768 CL |
102 | |
103 | /* Mount options that take string arguments */ | |
0d71b058 | 104 | Opt_nfsvers, |
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" }, | |
bf0fd768 CL |
136 | { Opt_udp, "udp" }, |
137 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 138 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
139 | { Opt_acl, "acl" }, |
140 | { Opt_noacl, "noacl" }, | |
141 | { Opt_rdirplus, "rdirplus" }, | |
142 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
143 | { Opt_sharecache, "sharecache" }, |
144 | { Opt_nosharecache, "nosharecache" }, | |
d740351b CL |
145 | { Opt_resvport, "resvport" }, |
146 | { Opt_noresvport, "noresvport" }, | |
b797cac7 | 147 | { Opt_fscache, "fsc" }, |
b797cac7 | 148 | { Opt_nofscache, "nofsc" }, |
bf0fd768 | 149 | |
a5a16bae CL |
150 | { Opt_port, "port=%s" }, |
151 | { Opt_rsize, "rsize=%s" }, | |
152 | { Opt_wsize, "wsize=%s" }, | |
153 | { Opt_bsize, "bsize=%s" }, | |
154 | { Opt_timeo, "timeo=%s" }, | |
155 | { Opt_retrans, "retrans=%s" }, | |
156 | { Opt_acregmin, "acregmin=%s" }, | |
157 | { Opt_acregmax, "acregmax=%s" }, | |
158 | { Opt_acdirmin, "acdirmin=%s" }, | |
159 | { Opt_acdirmax, "acdirmax=%s" }, | |
160 | { Opt_actimeo, "actimeo=%s" }, | |
161 | { Opt_namelen, "namlen=%s" }, | |
162 | { Opt_mountport, "mountport=%s" }, | |
163 | { Opt_mountvers, "mountvers=%s" }, | |
0d71b058 TM |
164 | { Opt_minorversion, "minorversion=%s" }, |
165 | ||
a5a16bae CL |
166 | { Opt_nfsvers, "nfsvers=%s" }, |
167 | { Opt_nfsvers, "vers=%s" }, | |
bf0fd768 CL |
168 | |
169 | { Opt_sec, "sec=%s" }, | |
170 | { Opt_proto, "proto=%s" }, | |
171 | { Opt_mountproto, "mountproto=%s" }, | |
172 | { Opt_addr, "addr=%s" }, | |
173 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 174 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 175 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 | 176 | |
7973c1f1 | 177 | { Opt_lookupcache, "lookupcache=%s" }, |
a6d5ff64 | 178 | { Opt_fscache_uniq, "fsc=%s" }, |
5eebde23 | 179 | { Opt_local_lock, "local_lock=%s" }, |
7973c1f1 | 180 | |
3862279a TM |
181 | /* The following needs to be listed after all other options */ |
182 | { Opt_nfsvers, "v%s" }, | |
183 | ||
bf0fd768 CL |
184 | { Opt_err, NULL } |
185 | }; | |
186 | ||
187 | enum { | |
ee671b01 | 188 | Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, |
bf0fd768 CL |
189 | |
190 | Opt_xprt_err | |
191 | }; | |
192 | ||
a447c093 | 193 | static const match_table_t nfs_xprt_protocol_tokens = { |
bf0fd768 | 194 | { Opt_xprt_udp, "udp" }, |
ee671b01 | 195 | { Opt_xprt_udp6, "udp6" }, |
bf0fd768 | 196 | { Opt_xprt_tcp, "tcp" }, |
ee671b01 | 197 | { Opt_xprt_tcp6, "tcp6" }, |
2cf7ff7a | 198 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
199 | |
200 | { Opt_xprt_err, NULL } | |
201 | }; | |
202 | ||
203 | enum { | |
204 | Opt_sec_none, Opt_sec_sys, | |
205 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
206 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
207 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
208 | ||
209 | Opt_sec_err | |
210 | }; | |
211 | ||
a447c093 | 212 | static const match_table_t nfs_secflavor_tokens = { |
bf0fd768 CL |
213 | { Opt_sec_none, "none" }, |
214 | { Opt_sec_none, "null" }, | |
215 | { Opt_sec_sys, "sys" }, | |
216 | ||
217 | { Opt_sec_krb5, "krb5" }, | |
218 | { Opt_sec_krb5i, "krb5i" }, | |
219 | { Opt_sec_krb5p, "krb5p" }, | |
220 | ||
221 | { Opt_sec_lkey, "lkey" }, | |
222 | { Opt_sec_lkeyi, "lkeyi" }, | |
223 | { Opt_sec_lkeyp, "lkeyp" }, | |
224 | ||
8d042218 OK |
225 | { Opt_sec_spkm, "spkm3" }, |
226 | { Opt_sec_spkmi, "spkm3i" }, | |
227 | { Opt_sec_spkmp, "spkm3p" }, | |
228 | ||
bf0fd768 CL |
229 | { Opt_sec_err, NULL } |
230 | }; | |
231 | ||
7973c1f1 TM |
232 | enum { |
233 | Opt_lookupcache_all, Opt_lookupcache_positive, | |
234 | Opt_lookupcache_none, | |
235 | ||
236 | Opt_lookupcache_err | |
237 | }; | |
238 | ||
239 | static match_table_t nfs_lookupcache_tokens = { | |
240 | { Opt_lookupcache_all, "all" }, | |
241 | { Opt_lookupcache_positive, "pos" }, | |
242 | { Opt_lookupcache_positive, "positive" }, | |
243 | { Opt_lookupcache_none, "none" }, | |
244 | ||
245 | { Opt_lookupcache_err, NULL } | |
246 | }; | |
247 | ||
5eebde23 SJ |
248 | enum { |
249 | Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, | |
250 | Opt_local_lock_none, | |
251 | ||
252 | Opt_local_lock_err | |
253 | }; | |
254 | ||
255 | static match_table_t nfs_local_lock_tokens = { | |
256 | { Opt_local_lock_all, "all" }, | |
257 | { Opt_local_lock_flock, "flock" }, | |
258 | { Opt_local_lock_posix, "posix" }, | |
259 | { Opt_local_lock_none, "none" }, | |
260 | ||
261 | { Opt_local_lock_err, NULL } | |
262 | }; | |
263 | ||
0d71b058 TM |
264 | enum { |
265 | Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, | |
266 | Opt_vers_4_1, | |
267 | ||
268 | Opt_vers_err | |
269 | }; | |
270 | ||
271 | static match_table_t nfs_vers_tokens = { | |
272 | { Opt_vers_2, "2" }, | |
273 | { Opt_vers_3, "3" }, | |
274 | { Opt_vers_4, "4" }, | |
275 | { Opt_vers_4_0, "4.0" }, | |
276 | { Opt_vers_4_1, "4.1" }, | |
277 | ||
278 | { Opt_vers_err, NULL } | |
279 | }; | |
bf0fd768 | 280 | |
c40f8d1d BS |
281 | struct nfs_mount_info { |
282 | void (*fill_super)(struct super_block *, struct nfs_mount_info *); | |
3d176e3f | 283 | int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); |
c40f8d1d | 284 | struct nfs_parsed_mount_data *parsed; |
8c958e0c | 285 | struct nfs_clone_mount *cloned; |
87c7083d | 286 | struct nfs_fh *mntfh; |
c40f8d1d BS |
287 | }; |
288 | ||
42faad99 | 289 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 290 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
34c80b1d | 291 | static int nfs_show_options(struct seq_file *, struct dentry *); |
d861c630 | 292 | static int nfs_show_devname(struct seq_file *, struct dentry *); |
a6322de6 | 293 | static int nfs_show_path(struct seq_file *, struct dentry *); |
64132379 | 294 | static int nfs_show_stats(struct seq_file *, struct dentry *); |
486aa699 | 295 | static struct dentry *nfs_fs_mount_common(struct file_system_type *, |
87c7083d | 296 | struct nfs_server *, int, const char *, struct nfs_mount_info *); |
01194981 AV |
297 | static struct dentry *nfs_fs_mount(struct file_system_type *, |
298 | int, const char *, void *); | |
31f43471 AV |
299 | static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, |
300 | int flags, const char *dev_name, void *raw_data); | |
387c149b | 301 | static void nfs_put_super(struct super_block *); |
f7b422b1 | 302 | static void nfs_kill_super(struct super_block *); |
48b605f8 | 303 | static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); |
f7b422b1 DH |
304 | |
305 | static struct file_system_type nfs_fs_type = { | |
306 | .owner = THIS_MODULE, | |
307 | .name = "nfs", | |
01194981 | 308 | .mount = nfs_fs_mount, |
f7b422b1 | 309 | .kill_sb = nfs_kill_super, |
349457cc | 310 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
311 | }; |
312 | ||
54ceac45 | 313 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
314 | .owner = THIS_MODULE, |
315 | .name = "nfs", | |
31f43471 | 316 | .mount = nfs_xdev_mount, |
f7b422b1 | 317 | .kill_sb = nfs_kill_super, |
349457cc | 318 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
319 | }; |
320 | ||
ee9b6d61 | 321 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
322 | .alloc_inode = nfs_alloc_inode, |
323 | .destroy_inode = nfs_destroy_inode, | |
324 | .write_inode = nfs_write_inode, | |
387c149b | 325 | .put_super = nfs_put_super, |
f7b422b1 | 326 | .statfs = nfs_statfs, |
b57922d9 | 327 | .evict_inode = nfs_evict_inode, |
f7b422b1 DH |
328 | .umount_begin = nfs_umount_begin, |
329 | .show_options = nfs_show_options, | |
c7f404b4 AV |
330 | .show_devname = nfs_show_devname, |
331 | .show_path = nfs_show_path, | |
f7b422b1 | 332 | .show_stats = nfs_show_stats, |
48b605f8 | 333 | .remount_fs = nfs_remount, |
f7b422b1 DH |
334 | }; |
335 | ||
336 | #ifdef CONFIG_NFS_V4 | |
b72e4f42 | 337 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); |
d72c727c BS |
338 | static int nfs4_validate_mount_data(void *options, |
339 | struct nfs_parsed_mount_data *args, const char *dev_name); | |
01194981 | 340 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
87c7083d | 341 | struct nfs_mount_info *mount_info); |
31f43471 AV |
342 | static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
343 | int flags, const char *dev_name, void *raw_data); | |
344 | static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, | |
345 | int flags, const char *dev_name, void *raw_data); | |
01194981 AV |
346 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
347 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
348 | static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
349 | int flags, const char *dev_name, void *raw_data); | |
f7b422b1 DH |
350 | |
351 | static struct file_system_type nfs4_fs_type = { | |
352 | .owner = THIS_MODULE, | |
353 | .name = "nfs4", | |
87c7083d | 354 | .mount = nfs_fs_mount, |
eeebf916 | 355 | .kill_sb = nfs_kill_super, |
349457cc | 356 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
357 | }; |
358 | ||
c02d7adf TM |
359 | static struct file_system_type nfs4_remote_fs_type = { |
360 | .owner = THIS_MODULE, | |
361 | .name = "nfs4", | |
31f43471 | 362 | .mount = nfs4_remote_mount, |
eeebf916 | 363 | .kill_sb = nfs_kill_super, |
c02d7adf TM |
364 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
365 | }; | |
366 | ||
54ceac45 | 367 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
368 | .owner = THIS_MODULE, |
369 | .name = "nfs4", | |
31f43471 | 370 | .mount = nfs4_xdev_mount, |
eeebf916 | 371 | .kill_sb = nfs_kill_super, |
349457cc | 372 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
373 | }; |
374 | ||
c02d7adf TM |
375 | static struct file_system_type nfs4_remote_referral_fs_type = { |
376 | .owner = THIS_MODULE, | |
377 | .name = "nfs4", | |
31f43471 | 378 | .mount = nfs4_remote_referral_mount, |
eeebf916 | 379 | .kill_sb = nfs_kill_super, |
c02d7adf TM |
380 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
381 | }; | |
382 | ||
54ceac45 | 383 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
384 | .owner = THIS_MODULE, |
385 | .name = "nfs4", | |
01194981 | 386 | .mount = nfs4_referral_mount, |
eeebf916 | 387 | .kill_sb = nfs_kill_super, |
349457cc | 388 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
389 | }; |
390 | ||
ee9b6d61 | 391 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
392 | .alloc_inode = nfs_alloc_inode, |
393 | .destroy_inode = nfs_destroy_inode, | |
a8d8f02c | 394 | .write_inode = nfs4_write_inode, |
387c149b | 395 | .put_super = nfs_put_super, |
f7b422b1 | 396 | .statfs = nfs_statfs, |
b57922d9 | 397 | .evict_inode = nfs4_evict_inode, |
f7b422b1 DH |
398 | .umount_begin = nfs_umount_begin, |
399 | .show_options = nfs_show_options, | |
c7f404b4 AV |
400 | .show_devname = nfs_show_devname, |
401 | .show_path = nfs_show_path, | |
f7b422b1 | 402 | .show_stats = nfs_show_stats, |
48b605f8 | 403 | .remount_fs = nfs_remount, |
f7b422b1 DH |
404 | }; |
405 | #endif | |
406 | ||
8e1f936b RR |
407 | static struct shrinker acl_shrinker = { |
408 | .shrink = nfs_access_cache_shrinker, | |
409 | .seeks = DEFAULT_SEEKS, | |
410 | }; | |
979df72e | 411 | |
f7b422b1 DH |
412 | /* |
413 | * Register the NFS filesystems | |
414 | */ | |
415 | int __init register_nfs_fs(void) | |
416 | { | |
417 | int ret; | |
418 | ||
419 | ret = register_filesystem(&nfs_fs_type); | |
420 | if (ret < 0) | |
421 | goto error_0; | |
422 | ||
f7b422b1 DH |
423 | ret = nfs_register_sysctl(); |
424 | if (ret < 0) | |
425 | goto error_1; | |
89a09141 | 426 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
427 | ret = register_filesystem(&nfs4_fs_type); |
428 | if (ret < 0) | |
429 | goto error_2; | |
430 | #endif | |
8e1f936b | 431 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
432 | return 0; |
433 | ||
434 | #ifdef CONFIG_NFS_V4 | |
435 | error_2: | |
436 | nfs_unregister_sysctl(); | |
89a09141 | 437 | #endif |
f7b422b1 DH |
438 | error_1: |
439 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
440 | error_0: |
441 | return ret; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Unregister the NFS filesystems | |
446 | */ | |
447 | void __exit unregister_nfs_fs(void) | |
448 | { | |
8e1f936b | 449 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
450 | #ifdef CONFIG_NFS_V4 |
451 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 452 | #endif |
49af7ee1 | 453 | nfs_unregister_sysctl(); |
f7b422b1 DH |
454 | unregister_filesystem(&nfs_fs_type); |
455 | } | |
456 | ||
1daef0a8 | 457 | void nfs_sb_active(struct super_block *sb) |
ef818a28 | 458 | { |
1daef0a8 | 459 | struct nfs_server *server = NFS_SB(sb); |
ef818a28 | 460 | |
1daef0a8 TM |
461 | if (atomic_inc_return(&server->active) == 1) |
462 | atomic_inc(&sb->s_active); | |
ef818a28 SD |
463 | } |
464 | ||
1daef0a8 | 465 | void nfs_sb_deactive(struct super_block *sb) |
ef818a28 SD |
466 | { |
467 | struct nfs_server *server = NFS_SB(sb); | |
1daef0a8 TM |
468 | |
469 | if (atomic_dec_and_test(&server->active)) | |
470 | deactivate_super(sb); | |
ef818a28 SD |
471 | } |
472 | ||
f7b422b1 DH |
473 | /* |
474 | * Deliver file system statistics to userspace | |
475 | */ | |
816724e6 | 476 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 477 | { |
0c7d90cf | 478 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
479 | unsigned char blockbits; |
480 | unsigned long blockres; | |
0c7d90cf | 481 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
ca7e9a0d TM |
482 | struct nfs_fsstat res; |
483 | int error = -ENOMEM; | |
484 | ||
485 | res.fattr = nfs_alloc_fattr(); | |
486 | if (res.fattr == NULL) | |
487 | goto out_err; | |
f7b422b1 | 488 | |
8fa5c000 | 489 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
fbf3fdd2 MZ |
490 | if (unlikely(error == -ESTALE)) { |
491 | struct dentry *pd_dentry; | |
492 | ||
493 | pd_dentry = dget_parent(dentry); | |
494 | if (pd_dentry != NULL) { | |
495 | nfs_zap_caches(pd_dentry->d_inode); | |
496 | dput(pd_dentry); | |
497 | } | |
498 | } | |
ca7e9a0d | 499 | nfs_free_fattr(res.fattr); |
f7b422b1 DH |
500 | if (error < 0) |
501 | goto out_err; | |
ca7e9a0d | 502 | |
1a0ba9ae | 503 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
504 | |
505 | /* | |
506 | * Current versions of glibc do not correctly handle the | |
507 | * case where f_frsize != f_bsize. Eventually we want to | |
508 | * report the value of wtmult in this field. | |
509 | */ | |
0c7d90cf | 510 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
511 | |
512 | /* | |
513 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
514 | * are reported in units of f_frsize. Linux hasn't had | |
515 | * an f_frsize field in its statfs struct until recently, | |
516 | * thus historically Linux's sys_statfs reports these | |
517 | * fields in units of f_bsize. | |
518 | */ | |
0c7d90cf DH |
519 | buf->f_bsize = dentry->d_sb->s_blocksize; |
520 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
521 | blockres = (1 << blockbits) - 1; |
522 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
523 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
524 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
525 | ||
526 | buf->f_files = res.tfiles; | |
527 | buf->f_ffree = res.afiles; | |
528 | ||
529 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 530 | |
f7b422b1 DH |
531 | return 0; |
532 | ||
533 | out_err: | |
3110ff80 | 534 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 535 | return error; |
f7b422b1 DH |
536 | } |
537 | ||
7d4e2747 DH |
538 | /* |
539 | * Map the security flavour number to a name | |
540 | */ | |
81039f1f TM |
541 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
542 | { | |
7d4e2747 | 543 | static const struct { |
81039f1f TM |
544 | rpc_authflavor_t flavour; |
545 | const char *str; | |
546 | } sec_flavours[] = { | |
547 | { RPC_AUTH_NULL, "null" }, | |
548 | { RPC_AUTH_UNIX, "sys" }, | |
549 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
550 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
551 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
552 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
553 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
554 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
555 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
556 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
557 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 558 | { UINT_MAX, "unknown" } |
81039f1f TM |
559 | }; |
560 | int i; | |
561 | ||
4d81cd16 | 562 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
563 | if (sec_flavours[i].flavour == flavour) |
564 | break; | |
565 | } | |
566 | return sec_flavours[i].str; | |
567 | } | |
568 | ||
ee671b01 JL |
569 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
570 | int showdefaults) | |
571 | { | |
572 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; | |
573 | ||
574 | seq_printf(m, ",mountproto="); | |
575 | switch (sap->sa_family) { | |
576 | case AF_INET: | |
577 | switch (nfss->mountd_protocol) { | |
578 | case IPPROTO_UDP: | |
579 | seq_printf(m, RPCBIND_NETID_UDP); | |
580 | break; | |
581 | case IPPROTO_TCP: | |
582 | seq_printf(m, RPCBIND_NETID_TCP); | |
583 | break; | |
584 | default: | |
585 | if (showdefaults) | |
586 | seq_printf(m, "auto"); | |
587 | } | |
588 | break; | |
589 | case AF_INET6: | |
590 | switch (nfss->mountd_protocol) { | |
591 | case IPPROTO_UDP: | |
592 | seq_printf(m, RPCBIND_NETID_UDP6); | |
593 | break; | |
594 | case IPPROTO_TCP: | |
595 | seq_printf(m, RPCBIND_NETID_TCP6); | |
596 | break; | |
597 | default: | |
598 | if (showdefaults) | |
599 | seq_printf(m, "auto"); | |
600 | } | |
601 | break; | |
602 | default: | |
603 | if (showdefaults) | |
604 | seq_printf(m, "auto"); | |
605 | } | |
606 | } | |
607 | ||
82d101d5 CL |
608 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
609 | int showdefaults) | |
610 | { | |
611 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
612 | ||
d5eff1a3 BS |
613 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
614 | return; | |
615 | ||
82d101d5 CL |
616 | switch (sap->sa_family) { |
617 | case AF_INET: { | |
618 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
be859405 | 619 | seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
82d101d5 CL |
620 | break; |
621 | } | |
622 | case AF_INET6: { | |
623 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
d250e190 | 624 | seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
82d101d5 CL |
625 | break; |
626 | } | |
627 | default: | |
628 | if (showdefaults) | |
629 | seq_printf(m, ",mountaddr=unspecified"); | |
630 | } | |
631 | ||
632 | if (nfss->mountd_version || showdefaults) | |
633 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
aa699473 SK |
634 | if ((nfss->mountd_port && |
635 | nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || | |
636 | showdefaults) | |
82d101d5 CL |
637 | seq_printf(m, ",mountport=%u", nfss->mountd_port); |
638 | ||
ee671b01 | 639 | nfs_show_mountd_netid(m, nfss, showdefaults); |
82d101d5 CL |
640 | } |
641 | ||
0be8189f TM |
642 | #ifdef CONFIG_NFS_V4 |
643 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
644 | int showdefaults) | |
645 | { | |
646 | struct nfs_client *clp = nfss->nfs_client; | |
647 | ||
648 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
0be8189f TM |
649 | } |
650 | #else | |
651 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
652 | int showdefaults) | |
653 | { | |
654 | } | |
655 | #endif | |
656 | ||
7bbceb6f TM |
657 | static void nfs_show_nfs_version(struct seq_file *m, |
658 | unsigned int version, | |
659 | unsigned int minorversion) | |
660 | { | |
661 | seq_printf(m, ",vers=%u", version); | |
662 | if (version == 4) | |
663 | seq_printf(m, ".%u", minorversion); | |
664 | } | |
665 | ||
f7b422b1 DH |
666 | /* |
667 | * Describe the mount options in force on this server representation | |
668 | */ | |
82d101d5 CL |
669 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
670 | int showdefaults) | |
f7b422b1 | 671 | { |
509de811 | 672 | static const struct proc_nfs_info { |
f7b422b1 | 673 | int flag; |
509de811 DH |
674 | const char *str; |
675 | const char *nostr; | |
f7b422b1 DH |
676 | } nfs_info[] = { |
677 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 | 678 | { NFS_MOUNT_POSIX, ",posix", "" }, |
f7b422b1 DH |
679 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
680 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
681 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
682 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 683 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
d740351b CL |
684 | { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
685 | { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, | |
f7b422b1 DH |
686 | { 0, NULL, NULL } |
687 | }; | |
509de811 | 688 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 689 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 690 | u32 version = clp->rpc_ops->version; |
7c563cc9 | 691 | int local_flock, local_fcntl; |
f7b422b1 | 692 | |
7bbceb6f | 693 | nfs_show_nfs_version(m, version, clp->cl_minorversion); |
2d767432 CL |
694 | seq_printf(m, ",rsize=%u", nfss->rsize); |
695 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
696 | if (nfss->bsize != 0) |
697 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
698 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 699 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 700 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 701 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 702 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 703 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 704 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 705 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 706 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
707 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
708 | if (nfss->flags & nfs_infop->flag) | |
709 | seq_puts(m, nfs_infop->str); | |
710 | else | |
711 | seq_puts(m, nfs_infop->nostr); | |
712 | } | |
2446ab60 | 713 | rcu_read_lock(); |
56928edd | 714 | seq_printf(m, ",proto=%s", |
ee671b01 | 715 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
2446ab60 | 716 | rcu_read_unlock(); |
82d101d5 CL |
717 | if (version == 4) { |
718 | if (nfss->port != NFS_PORT) | |
719 | seq_printf(m, ",port=%u", nfss->port); | |
720 | } else | |
721 | if (nfss->port) | |
722 | seq_printf(m, ",port=%u", nfss->port); | |
723 | ||
33170233 TM |
724 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
725 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 726 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
727 | |
728 | if (version != 4) | |
729 | nfs_show_mountd_options(m, nfss, showdefaults); | |
0be8189f TM |
730 | else |
731 | nfs_show_nfsv4_options(m, nfss, showdefaults); | |
82d101d5 | 732 | |
b797cac7 DH |
733 | if (nfss->options & NFS_OPTION_FSCACHE) |
734 | seq_printf(m, ",fsc"); | |
9b00c643 PL |
735 | |
736 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { | |
737 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) | |
738 | seq_printf(m, ",lookupcache=none"); | |
739 | else | |
740 | seq_printf(m, ",lookupcache=pos"); | |
741 | } | |
7c563cc9 SJ |
742 | |
743 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; | |
744 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; | |
745 | ||
746 | if (!local_flock && !local_fcntl) | |
747 | seq_printf(m, ",local_lock=none"); | |
748 | else if (local_flock && local_fcntl) | |
749 | seq_printf(m, ",local_lock=all"); | |
750 | else if (local_flock) | |
751 | seq_printf(m, ",local_lock=flock"); | |
752 | else | |
753 | seq_printf(m, ",local_lock=posix"); | |
f7b422b1 DH |
754 | } |
755 | ||
756 | /* | |
757 | * Describe the mount options on this VFS mountpoint | |
758 | */ | |
34c80b1d | 759 | static int nfs_show_options(struct seq_file *m, struct dentry *root) |
f7b422b1 | 760 | { |
34c80b1d | 761 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
762 | |
763 | nfs_show_mount_options(m, nfss, 0); | |
764 | ||
2446ab60 | 765 | rcu_read_lock(); |
5d8515ca CL |
766 | seq_printf(m, ",addr=%s", |
767 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
768 | RPC_DISPLAY_ADDR)); | |
2446ab60 | 769 | rcu_read_unlock(); |
f7b422b1 DH |
770 | |
771 | return 0; | |
772 | } | |
45402c38 HS |
773 | |
774 | #ifdef CONFIG_NFS_V4 | |
ae50c0b5 | 775 | #ifdef CONFIG_NFS_V4_1 |
45402c38 | 776 | static void show_sessions(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
777 | { |
778 | if (nfs4_has_session(server->nfs_client)) | |
779 | seq_printf(m, ",sessions"); | |
780 | } | |
781 | #else | |
45402c38 HS |
782 | static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
783 | #endif | |
ae50c0b5 BF |
784 | #endif |
785 | ||
786 | #ifdef CONFIG_NFS_V4_1 | |
45402c38 | 787 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
788 | { |
789 | seq_printf(m, ",pnfs="); | |
790 | if (server->pnfs_curr_ld) | |
791 | seq_printf(m, "%s", server->pnfs_curr_ld->name); | |
792 | else | |
793 | seq_printf(m, "not configured"); | |
794 | } | |
7e03b7cc TM |
795 | |
796 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) | |
797 | { | |
59155546 CL |
798 | if (nfss->nfs_client && nfss->nfs_client->cl_implid) { |
799 | struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; | |
7e03b7cc TM |
800 | seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," |
801 | "date='%llu,%u'", | |
802 | impl_id->name, impl_id->domain, | |
803 | impl_id->date.seconds, impl_id->date.nseconds); | |
804 | } | |
805 | } | |
45402c38 | 806 | #else |
7e03b7cc TM |
807 | #ifdef CONFIG_NFS_V4 |
808 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) | |
809 | { | |
810 | } | |
45402c38 | 811 | #endif |
7e03b7cc TM |
812 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
813 | { | |
814 | } | |
45402c38 | 815 | #endif |
f7b422b1 | 816 | |
d861c630 | 817 | static int nfs_show_devname(struct seq_file *m, struct dentry *root) |
c7f404b4 AV |
818 | { |
819 | char *page = (char *) __get_free_page(GFP_KERNEL); | |
820 | char *devname, *dummy; | |
821 | int err = 0; | |
822 | if (!page) | |
823 | return -ENOMEM; | |
d861c630 | 824 | devname = nfs_path(&dummy, root, page, PAGE_SIZE); |
c7f404b4 AV |
825 | if (IS_ERR(devname)) |
826 | err = PTR_ERR(devname); | |
827 | else | |
828 | seq_escape(m, devname, " \t\n\\"); | |
829 | free_page((unsigned long)page); | |
830 | return err; | |
831 | } | |
832 | ||
a6322de6 | 833 | static int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
c7f404b4 AV |
834 | { |
835 | seq_puts(m, "/"); | |
836 | return 0; | |
837 | } | |
838 | ||
f7b422b1 DH |
839 | /* |
840 | * Present statistical information for this VFS mountpoint | |
841 | */ | |
64132379 | 842 | static int nfs_show_stats(struct seq_file *m, struct dentry *root) |
f7b422b1 DH |
843 | { |
844 | int i, cpu; | |
64132379 | 845 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
846 | struct rpc_auth *auth = nfss->client->cl_auth; |
847 | struct nfs_iostats totals = { }; | |
848 | ||
849 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
850 | ||
851 | /* | |
852 | * Display all mount option settings | |
853 | */ | |
854 | seq_printf(m, "\n\topts:\t"); | |
64132379 AV |
855 | seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); |
856 | seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
857 | seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
858 | seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
f7b422b1 DH |
859 | nfs_show_mount_options(m, nfss, 1); |
860 | ||
861 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
862 | ||
7e03b7cc | 863 | show_implementation_id(m, nfss); |
7d2ed9ac | 864 | |
f7b422b1 DH |
865 | seq_printf(m, "\n\tcaps:\t"); |
866 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
867 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
868 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
869 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
870 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
871 | |
872 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 873 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
874 | seq_printf(m, "\n\tnfsv4:\t"); |
875 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
876 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
877 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
ae50c0b5 BF |
878 | show_sessions(m, nfss); |
879 | show_pnfs(m, nfss); | |
f7b422b1 DH |
880 | } |
881 | #endif | |
882 | ||
883 | /* | |
884 | * Display security flavor in effect for this mount | |
885 | */ | |
2d767432 | 886 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 887 | if (auth->au_flavor) |
2d767432 | 888 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
889 | |
890 | /* | |
891 | * Display superblock I/O counters | |
892 | */ | |
893 | for_each_possible_cpu(cpu) { | |
894 | struct nfs_iostats *stats; | |
895 | ||
896 | preempt_disable(); | |
897 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
898 | ||
899 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
900 | totals.events[i] += stats->events[i]; | |
901 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
902 | totals.bytes[i] += stats->bytes[i]; | |
6a51091d DH |
903 | #ifdef CONFIG_NFS_FSCACHE |
904 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
905 | totals.fscache[i] += stats->fscache[i]; | |
906 | #endif | |
f7b422b1 DH |
907 | |
908 | preempt_enable(); | |
909 | } | |
910 | ||
911 | seq_printf(m, "\n\tevents:\t"); | |
912 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
913 | seq_printf(m, "%lu ", totals.events[i]); | |
914 | seq_printf(m, "\n\tbytes:\t"); | |
915 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
916 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
6a51091d DH |
917 | #ifdef CONFIG_NFS_FSCACHE |
918 | if (nfss->options & NFS_OPTION_FSCACHE) { | |
919 | seq_printf(m, "\n\tfsc:\t"); | |
920 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
921 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
922 | } | |
923 | #endif | |
f7b422b1 DH |
924 | seq_printf(m, "\n"); |
925 | ||
926 | rpc_print_iostats(m, nfss->client); | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 933 | * in response to xdev traversals and referrals |
f7b422b1 | 934 | */ |
42faad99 | 935 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 936 | { |
67e55205 | 937 | struct nfs_server *server; |
fc6ae3cf TM |
938 | struct rpc_clnt *rpc; |
939 | ||
67e55205 | 940 | server = NFS_SB(sb); |
fc6ae3cf TM |
941 | /* -EIO all pending I/O */ |
942 | rpc = server->client_acl; | |
943 | if (!IS_ERR(rpc)) | |
944 | rpc_killall_tasks(rpc); | |
945 | rpc = server->client; | |
946 | if (!IS_ERR(rpc)) | |
947 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
948 | } |
949 | ||
db833351 | 950 | static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) |
9423a08a CL |
951 | { |
952 | struct nfs_parsed_mount_data *data; | |
953 | ||
954 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
955 | if (data) { | |
9423a08a CL |
956 | data->acregmin = NFS_DEF_ACREGMIN; |
957 | data->acregmax = NFS_DEF_ACREGMAX; | |
958 | data->acdirmin = NFS_DEF_ACDIRMIN; | |
959 | data->acdirmax = NFS_DEF_ACDIRMAX; | |
c5811dbd | 960 | data->mount_server.port = NFS_UNSPEC_PORT; |
9423a08a | 961 | data->nfs_server.port = NFS_UNSPEC_PORT; |
c5811dbd | 962 | data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
9423a08a CL |
963 | data->auth_flavors[0] = RPC_AUTH_UNIX; |
964 | data->auth_flavor_len = 1; | |
965 | data->minorversion = 0; | |
b72e4f42 | 966 | data->need_mount = true; |
9937347a | 967 | data->net = current->nsproxy->net_ns; |
8a0d551a | 968 | security_init_mnt_opts(&data->lsm_opts); |
9423a08a CL |
969 | } |
970 | return data; | |
971 | } | |
972 | ||
8a0d551a JL |
973 | static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) |
974 | { | |
975 | if (data) { | |
976 | kfree(data->client_address); | |
977 | kfree(data->mount_server.hostname); | |
978 | kfree(data->nfs_server.export_path); | |
979 | kfree(data->nfs_server.hostname); | |
980 | kfree(data->fscache_uniq); | |
981 | security_free_mnt_opts(&data->lsm_opts); | |
982 | kfree(data); | |
983 | } | |
984 | } | |
985 | ||
fc50d58f | 986 | /* |
cdcd7f9a CL |
987 | * Sanity-check a server address provided by the mount command. |
988 | * | |
989 | * Address family must be initialized, and address must not be | |
990 | * the ANY address for that family. | |
fc50d58f CL |
991 | */ |
992 | static int nfs_verify_server_address(struct sockaddr *addr) | |
993 | { | |
994 | switch (addr->sa_family) { | |
995 | case AF_INET: { | |
cdcd7f9a | 996 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 997 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
998 | } |
999 | case AF_INET6: { | |
1000 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
1001 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
1002 | } |
1003 | } | |
1004 | ||
53a0b9c4 | 1005 | dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
fc50d58f CL |
1006 | return 0; |
1007 | } | |
1008 | ||
4cfd74fc CL |
1009 | /* |
1010 | * Select between a default port value and a user-specified port value. | |
1011 | * If a zero value is set, then autobind will be used. | |
1012 | */ | |
f5855fec | 1013 | static void nfs_set_port(struct sockaddr *sap, int *port, |
4cfd74fc CL |
1014 | const unsigned short default_port) |
1015 | { | |
f5855fec TM |
1016 | if (*port == NFS_UNSPEC_PORT) |
1017 | *port = default_port; | |
4cfd74fc | 1018 | |
f5855fec | 1019 | rpc_set_port(sap, *port); |
4cfd74fc CL |
1020 | } |
1021 | ||
259875ef TM |
1022 | /* |
1023 | * Sanity check the NFS transport protocol. | |
1024 | * | |
1025 | */ | |
1026 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1027 | { | |
1028 | switch (mnt->nfs_server.protocol) { | |
1029 | case XPRT_TRANSPORT_UDP: | |
1030 | case XPRT_TRANSPORT_TCP: | |
1031 | case XPRT_TRANSPORT_RDMA: | |
1032 | break; | |
1033 | default: | |
1034 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
1040 | * settings should depend upon the specified NFS transport. | |
1041 | */ | |
1042 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1043 | { | |
1044 | nfs_validate_transport_protocol(mnt); | |
1045 | ||
1046 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
1047 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
1048 | return; | |
1049 | switch (mnt->nfs_server.protocol) { | |
1050 | case XPRT_TRANSPORT_UDP: | |
1051 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
1052 | break; | |
1053 | case XPRT_TRANSPORT_TCP: | |
1054 | case XPRT_TRANSPORT_RDMA: | |
1055 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
1056 | } | |
1057 | } | |
1058 | ||
01060c89 CL |
1059 | /* |
1060 | * Parse the value of the 'sec=' option. | |
01060c89 CL |
1061 | */ |
1062 | static int nfs_parse_security_flavors(char *value, | |
1063 | struct nfs_parsed_mount_data *mnt) | |
1064 | { | |
1065 | substring_t args[MAX_OPT_ARGS]; | |
1066 | ||
1067 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
1068 | ||
1069 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
1070 | case Opt_sec_none: | |
01060c89 CL |
1071 | mnt->auth_flavors[0] = RPC_AUTH_NULL; |
1072 | break; | |
1073 | case Opt_sec_sys: | |
01060c89 CL |
1074 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
1075 | break; | |
1076 | case Opt_sec_krb5: | |
01060c89 CL |
1077 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
1078 | break; | |
1079 | case Opt_sec_krb5i: | |
01060c89 CL |
1080 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
1081 | break; | |
1082 | case Opt_sec_krb5p: | |
01060c89 CL |
1083 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
1084 | break; | |
1085 | case Opt_sec_lkey: | |
01060c89 CL |
1086 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
1087 | break; | |
1088 | case Opt_sec_lkeyi: | |
01060c89 CL |
1089 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
1090 | break; | |
1091 | case Opt_sec_lkeyp: | |
01060c89 CL |
1092 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
1093 | break; | |
1094 | case Opt_sec_spkm: | |
01060c89 CL |
1095 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
1096 | break; | |
1097 | case Opt_sec_spkmi: | |
01060c89 CL |
1098 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
1099 | break; | |
1100 | case Opt_sec_spkmp: | |
01060c89 CL |
1101 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
1102 | break; | |
1103 | default: | |
1104 | return 0; | |
1105 | } | |
1106 | ||
9b7160c5 | 1107 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
059f90b3 | 1108 | mnt->auth_flavor_len = 1; |
01060c89 CL |
1109 | return 1; |
1110 | } | |
1111 | ||
0d71b058 TM |
1112 | static int nfs_parse_version_string(char *string, |
1113 | struct nfs_parsed_mount_data *mnt, | |
1114 | substring_t *args) | |
1115 | { | |
1116 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1117 | switch (match_token(string, nfs_vers_tokens, args)) { | |
1118 | case Opt_vers_2: | |
1119 | mnt->version = 2; | |
1120 | break; | |
1121 | case Opt_vers_3: | |
1122 | mnt->flags |= NFS_MOUNT_VER3; | |
1123 | mnt->version = 3; | |
1124 | break; | |
1125 | case Opt_vers_4: | |
1126 | /* Backward compatibility option. In future, | |
1127 | * the mount program should always supply | |
1128 | * a NFSv4 minor version number. | |
1129 | */ | |
1130 | mnt->version = 4; | |
1131 | break; | |
1132 | case Opt_vers_4_0: | |
1133 | mnt->version = 4; | |
1134 | mnt->minorversion = 0; | |
1135 | break; | |
1136 | case Opt_vers_4_1: | |
1137 | mnt->version = 4; | |
1138 | mnt->minorversion = 1; | |
1139 | break; | |
1140 | default: | |
1141 | return 0; | |
1142 | } | |
1143 | return 1; | |
1144 | } | |
1145 | ||
c5cb09b6 RL |
1146 | static int nfs_get_option_str(substring_t args[], char **option) |
1147 | { | |
1148 | kfree(*option); | |
1149 | *option = match_strdup(args); | |
1150 | return !option; | |
1151 | } | |
1152 | ||
1153 | static int nfs_get_option_ul(substring_t args[], unsigned long *option) | |
1154 | { | |
1155 | int rc; | |
1156 | char *string; | |
1157 | ||
1158 | string = match_strdup(args); | |
1159 | if (string == NULL) | |
1160 | return -ENOMEM; | |
1161 | rc = strict_strtoul(string, 10, option); | |
1162 | kfree(string); | |
1163 | ||
1164 | return rc; | |
1165 | } | |
1166 | ||
bf0fd768 CL |
1167 | /* |
1168 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
1169 | * a data structure. The whole mount string is processed; bad options are |
1170 | * skipped as they are encountered. If there were no errors, return 1; | |
1171 | * otherwise return 0 (zero). | |
bf0fd768 CL |
1172 | */ |
1173 | static int nfs_parse_mount_options(char *raw, | |
1174 | struct nfs_parsed_mount_data *mnt) | |
1175 | { | |
f9c3a380 | 1176 | char *p, *string, *secdata; |
d23c45fd | 1177 | int rc, sloppy = 0, invalid_option = 0; |
ee671b01 JL |
1178 | unsigned short protofamily = AF_UNSPEC; |
1179 | unsigned short mountfamily = AF_UNSPEC; | |
bf0fd768 CL |
1180 | |
1181 | if (!raw) { | |
1182 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
1183 | return 1; | |
1184 | } | |
1185 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
1186 | ||
f9c3a380 EP |
1187 | secdata = alloc_secdata(); |
1188 | if (!secdata) | |
1189 | goto out_nomem; | |
1190 | ||
1191 | rc = security_sb_copy_data(raw, secdata); | |
1192 | if (rc) | |
1193 | goto out_security_failure; | |
1194 | ||
1195 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
1196 | if (rc) | |
1197 | goto out_security_failure; | |
1198 | ||
1199 | free_secdata(secdata); | |
1200 | ||
bf0fd768 CL |
1201 | while ((p = strsep(&raw, ",")) != NULL) { |
1202 | substring_t args[MAX_OPT_ARGS]; | |
a5a16bae CL |
1203 | unsigned long option; |
1204 | int token; | |
bf0fd768 CL |
1205 | |
1206 | if (!*p) | |
1207 | continue; | |
1208 | ||
1209 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
1210 | ||
1211 | token = match_token(p, nfs_mount_option_tokens, args); | |
1212 | switch (token) { | |
f45663ce CL |
1213 | |
1214 | /* | |
1215 | * boolean options: foo/nofoo | |
1216 | */ | |
bf0fd768 CL |
1217 | case Opt_soft: |
1218 | mnt->flags |= NFS_MOUNT_SOFT; | |
1219 | break; | |
1220 | case Opt_hard: | |
1221 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
1222 | break; | |
bf0fd768 CL |
1223 | case Opt_posix: |
1224 | mnt->flags |= NFS_MOUNT_POSIX; | |
1225 | break; | |
1226 | case Opt_noposix: | |
1227 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
1228 | break; | |
1229 | case Opt_cto: | |
1230 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
1231 | break; | |
1232 | case Opt_nocto: | |
1233 | mnt->flags |= NFS_MOUNT_NOCTO; | |
1234 | break; | |
1235 | case Opt_ac: | |
1236 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
1237 | break; | |
1238 | case Opt_noac: | |
1239 | mnt->flags |= NFS_MOUNT_NOAC; | |
1240 | break; | |
1241 | case Opt_lock: | |
1242 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1243 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
1244 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1245 | break; |
1246 | case Opt_nolock: | |
1247 | mnt->flags |= NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1248 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
1249 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 | 1250 | break; |
bf0fd768 CL |
1251 | case Opt_udp: |
1252 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1253 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1254 | break; |
1255 | case Opt_tcp: | |
1256 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1257 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1258 | break; |
2cf7ff7a TT |
1259 | case Opt_rdma: |
1260 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1261 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1262 | xprt_load_transport(p); |
2cf7ff7a | 1263 | break; |
bf0fd768 CL |
1264 | case Opt_acl: |
1265 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1266 | break; | |
1267 | case Opt_noacl: | |
1268 | mnt->flags |= NFS_MOUNT_NOACL; | |
1269 | break; | |
1270 | case Opt_rdirplus: | |
1271 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1272 | break; | |
1273 | case Opt_nordirplus: | |
1274 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1275 | break; | |
75180df2 TM |
1276 | case Opt_sharecache: |
1277 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1278 | break; | |
1279 | case Opt_nosharecache: | |
1280 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1281 | break; | |
d740351b CL |
1282 | case Opt_resvport: |
1283 | mnt->flags &= ~NFS_MOUNT_NORESVPORT; | |
1284 | break; | |
1285 | case Opt_noresvport: | |
1286 | mnt->flags |= NFS_MOUNT_NORESVPORT; | |
1287 | break; | |
b797cac7 DH |
1288 | case Opt_fscache: |
1289 | mnt->options |= NFS_OPTION_FSCACHE; | |
1290 | kfree(mnt->fscache_uniq); | |
1291 | mnt->fscache_uniq = NULL; | |
1292 | break; | |
1293 | case Opt_nofscache: | |
1294 | mnt->options &= ~NFS_OPTION_FSCACHE; | |
1295 | kfree(mnt->fscache_uniq); | |
1296 | mnt->fscache_uniq = NULL; | |
1297 | break; | |
bf0fd768 | 1298 | |
f45663ce CL |
1299 | /* |
1300 | * options that take numeric values | |
1301 | */ | |
bf0fd768 | 1302 | case Opt_port: |
c5cb09b6 RL |
1303 | if (nfs_get_option_ul(args, &option) || |
1304 | option > USHRT_MAX) | |
d23c45fd CL |
1305 | goto out_invalid_value; |
1306 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1307 | break; |
1308 | case Opt_rsize: | |
c5cb09b6 | 1309 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1310 | goto out_invalid_value; |
1311 | mnt->rsize = option; | |
bf0fd768 CL |
1312 | break; |
1313 | case Opt_wsize: | |
c5cb09b6 | 1314 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1315 | goto out_invalid_value; |
1316 | mnt->wsize = option; | |
bf0fd768 CL |
1317 | break; |
1318 | case Opt_bsize: | |
c5cb09b6 | 1319 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1320 | goto out_invalid_value; |
1321 | mnt->bsize = option; | |
bf0fd768 CL |
1322 | break; |
1323 | case Opt_timeo: | |
c5cb09b6 | 1324 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1325 | goto out_invalid_value; |
1326 | mnt->timeo = option; | |
bf0fd768 CL |
1327 | break; |
1328 | case Opt_retrans: | |
c5cb09b6 | 1329 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1330 | goto out_invalid_value; |
1331 | mnt->retrans = option; | |
bf0fd768 CL |
1332 | break; |
1333 | case Opt_acregmin: | |
c5cb09b6 | 1334 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1335 | goto out_invalid_value; |
1336 | mnt->acregmin = option; | |
bf0fd768 CL |
1337 | break; |
1338 | case Opt_acregmax: | |
c5cb09b6 | 1339 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1340 | goto out_invalid_value; |
1341 | mnt->acregmax = option; | |
bf0fd768 CL |
1342 | break; |
1343 | case Opt_acdirmin: | |
c5cb09b6 | 1344 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1345 | goto out_invalid_value; |
1346 | mnt->acdirmin = option; | |
bf0fd768 CL |
1347 | break; |
1348 | case Opt_acdirmax: | |
c5cb09b6 | 1349 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1350 | goto out_invalid_value; |
1351 | mnt->acdirmax = option; | |
bf0fd768 CL |
1352 | break; |
1353 | case Opt_actimeo: | |
c5cb09b6 | 1354 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1355 | goto out_invalid_value; |
1356 | mnt->acregmin = mnt->acregmax = | |
1357 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1358 | break; |
1359 | case Opt_namelen: | |
c5cb09b6 | 1360 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1361 | goto out_invalid_value; |
1362 | mnt->namlen = option; | |
bf0fd768 CL |
1363 | break; |
1364 | case Opt_mountport: | |
c5cb09b6 RL |
1365 | if (nfs_get_option_ul(args, &option) || |
1366 | option > USHRT_MAX) | |
d23c45fd CL |
1367 | goto out_invalid_value; |
1368 | mnt->mount_server.port = option; | |
bf0fd768 | 1369 | break; |
bf0fd768 | 1370 | case Opt_mountvers: |
c5cb09b6 | 1371 | if (nfs_get_option_ul(args, &option) || |
f45663ce | 1372 | option < NFS_MNT_VERSION || |
d23c45fd CL |
1373 | option > NFS_MNT3_VERSION) |
1374 | goto out_invalid_value; | |
1375 | mnt->mount_server.version = option; | |
bf0fd768 | 1376 | break; |
3fd5be9e | 1377 | case Opt_minorversion: |
c5cb09b6 | 1378 | if (nfs_get_option_ul(args, &option)) |
f3f4f4ed CL |
1379 | goto out_invalid_value; |
1380 | if (option > NFS4_MAX_MINOR_VERSION) | |
1381 | goto out_invalid_value; | |
1382 | mnt->minorversion = option; | |
3fd5be9e | 1383 | break; |
bf0fd768 | 1384 | |
f45663ce CL |
1385 | /* |
1386 | * options that take text values | |
1387 | */ | |
0d71b058 TM |
1388 | case Opt_nfsvers: |
1389 | string = match_strdup(args); | |
1390 | if (string == NULL) | |
1391 | goto out_nomem; | |
1392 | rc = nfs_parse_version_string(string, mnt, args); | |
1393 | kfree(string); | |
1394 | if (!rc) | |
1395 | goto out_invalid_value; | |
1396 | break; | |
bf0fd768 CL |
1397 | case Opt_sec: |
1398 | string = match_strdup(args); | |
1399 | if (string == NULL) | |
1400 | goto out_nomem; | |
01060c89 | 1401 | rc = nfs_parse_security_flavors(string, mnt); |
bf0fd768 | 1402 | kfree(string); |
f45663ce | 1403 | if (!rc) { |
f45663ce CL |
1404 | dfprintk(MOUNT, "NFS: unrecognized " |
1405 | "security flavor\n"); | |
d23c45fd | 1406 | return 0; |
f45663ce | 1407 | } |
bf0fd768 CL |
1408 | break; |
1409 | case Opt_proto: | |
1410 | string = match_strdup(args); | |
1411 | if (string == NULL) | |
1412 | goto out_nomem; | |
1413 | token = match_token(string, | |
1414 | nfs_xprt_protocol_tokens, args); | |
bf0fd768 | 1415 | |
ee671b01 | 1416 | protofamily = AF_INET; |
bf0fd768 | 1417 | switch (token) { |
ee671b01 JL |
1418 | case Opt_xprt_udp6: |
1419 | protofamily = AF_INET6; | |
fdb66ff4 | 1420 | case Opt_xprt_udp: |
bf0fd768 | 1421 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 1422 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1423 | break; |
ee671b01 JL |
1424 | case Opt_xprt_tcp6: |
1425 | protofamily = AF_INET6; | |
fdb66ff4 | 1426 | case Opt_xprt_tcp: |
bf0fd768 | 1427 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1428 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1429 | break; |
2cf7ff7a TT |
1430 | case Opt_xprt_rdma: |
1431 | /* vector side protocols to TCP */ | |
1432 | mnt->flags |= NFS_MOUNT_TCP; | |
1433 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1434 | xprt_load_transport(string); |
2cf7ff7a | 1435 | break; |
bf0fd768 | 1436 | default: |
f45663ce CL |
1437 | dfprintk(MOUNT, "NFS: unrecognized " |
1438 | "transport protocol\n"); | |
4223a4a1 | 1439 | kfree(string); |
d23c45fd | 1440 | return 0; |
bf0fd768 | 1441 | } |
c5cb09b6 | 1442 | kfree(string); |
bf0fd768 CL |
1443 | break; |
1444 | case Opt_mountproto: | |
1445 | string = match_strdup(args); | |
1446 | if (string == NULL) | |
1447 | goto out_nomem; | |
1448 | token = match_token(string, | |
1449 | nfs_xprt_protocol_tokens, args); | |
d508afb4 | 1450 | kfree(string); |
bf0fd768 | 1451 | |
ee671b01 | 1452 | mountfamily = AF_INET; |
bf0fd768 | 1453 | switch (token) { |
ee671b01 JL |
1454 | case Opt_xprt_udp6: |
1455 | mountfamily = AF_INET6; | |
fdb66ff4 | 1456 | case Opt_xprt_udp: |
0896a725 | 1457 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1458 | break; |
ee671b01 JL |
1459 | case Opt_xprt_tcp6: |
1460 | mountfamily = AF_INET6; | |
fdb66ff4 | 1461 | case Opt_xprt_tcp: |
0896a725 | 1462 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1463 | break; |
2cf7ff7a | 1464 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1465 | default: |
f45663ce CL |
1466 | dfprintk(MOUNT, "NFS: unrecognized " |
1467 | "transport protocol\n"); | |
d23c45fd | 1468 | return 0; |
bf0fd768 CL |
1469 | } |
1470 | break; | |
1471 | case Opt_addr: | |
1472 | string = match_strdup(args); | |
1473 | if (string == NULL) | |
1474 | goto out_nomem; | |
53a0b9c4 | 1475 | mnt->nfs_server.addrlen = |
b48e1278 | 1476 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1477 | (struct sockaddr *) |
1478 | &mnt->nfs_server.address, | |
1479 | sizeof(mnt->nfs_server.address)); | |
bf0fd768 | 1480 | kfree(string); |
53a0b9c4 CL |
1481 | if (mnt->nfs_server.addrlen == 0) |
1482 | goto out_invalid_address; | |
bf0fd768 CL |
1483 | break; |
1484 | case Opt_clientaddr: | |
c5cb09b6 | 1485 | if (nfs_get_option_str(args, &mnt->client_address)) |
bf0fd768 | 1486 | goto out_nomem; |
bf0fd768 | 1487 | break; |
33832034 | 1488 | case Opt_mounthost: |
c5cb09b6 RL |
1489 | if (nfs_get_option_str(args, |
1490 | &mnt->mount_server.hostname)) | |
33832034 | 1491 | goto out_nomem; |
33832034 | 1492 | break; |
0ac83779 | 1493 | case Opt_mountaddr: |
bf0fd768 CL |
1494 | string = match_strdup(args); |
1495 | if (string == NULL) | |
1496 | goto out_nomem; | |
53a0b9c4 | 1497 | mnt->mount_server.addrlen = |
b48e1278 | 1498 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1499 | (struct sockaddr *) |
1500 | &mnt->mount_server.address, | |
1501 | sizeof(mnt->mount_server.address)); | |
bf0fd768 | 1502 | kfree(string); |
53a0b9c4 CL |
1503 | if (mnt->mount_server.addrlen == 0) |
1504 | goto out_invalid_address; | |
bf0fd768 | 1505 | break; |
7973c1f1 TM |
1506 | case Opt_lookupcache: |
1507 | string = match_strdup(args); | |
1508 | if (string == NULL) | |
1509 | goto out_nomem; | |
1510 | token = match_token(string, | |
1511 | nfs_lookupcache_tokens, args); | |
1512 | kfree(string); | |
1513 | switch (token) { | |
1514 | case Opt_lookupcache_all: | |
1515 | mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); | |
1516 | break; | |
1517 | case Opt_lookupcache_positive: | |
1518 | mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1519 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; | |
1520 | break; | |
1521 | case Opt_lookupcache_none: | |
1522 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1523 | break; | |
1524 | default: | |
7973c1f1 TM |
1525 | dfprintk(MOUNT, "NFS: invalid " |
1526 | "lookupcache argument\n"); | |
d23c45fd | 1527 | return 0; |
7973c1f1 TM |
1528 | }; |
1529 | break; | |
a6d5ff64 | 1530 | case Opt_fscache_uniq: |
c5cb09b6 | 1531 | if (nfs_get_option_str(args, &mnt->fscache_uniq)) |
a6d5ff64 | 1532 | goto out_nomem; |
a6d5ff64 CL |
1533 | mnt->options |= NFS_OPTION_FSCACHE; |
1534 | break; | |
5eebde23 SJ |
1535 | case Opt_local_lock: |
1536 | string = match_strdup(args); | |
1537 | if (string == NULL) | |
1538 | goto out_nomem; | |
1539 | token = match_token(string, nfs_local_lock_tokens, | |
1540 | args); | |
1541 | kfree(string); | |
1542 | switch (token) { | |
1543 | case Opt_local_lock_all: | |
1544 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | | |
1545 | NFS_MOUNT_LOCAL_FCNTL); | |
1546 | break; | |
1547 | case Opt_local_lock_flock: | |
1548 | mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; | |
1549 | break; | |
1550 | case Opt_local_lock_posix: | |
1551 | mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; | |
1552 | break; | |
1553 | case Opt_local_lock_none: | |
1554 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | | |
1555 | NFS_MOUNT_LOCAL_FCNTL); | |
1556 | break; | |
1557 | default: | |
1558 | dfprintk(MOUNT, "NFS: invalid " | |
1559 | "local_lock argument\n"); | |
1560 | return 0; | |
1561 | }; | |
1562 | break; | |
bf0fd768 | 1563 | |
f45663ce CL |
1564 | /* |
1565 | * Special options | |
1566 | */ | |
1567 | case Opt_sloppy: | |
1568 | sloppy = 1; | |
1569 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1570 | break; | |
bf0fd768 CL |
1571 | case Opt_userspace: |
1572 | case Opt_deprecated: | |
d33e4dfe CL |
1573 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1574 | "'%s'\n", p); | |
bf0fd768 CL |
1575 | break; |
1576 | ||
1577 | default: | |
d23c45fd | 1578 | invalid_option = 1; |
f45663ce CL |
1579 | dfprintk(MOUNT, "NFS: unrecognized mount option " |
1580 | "'%s'\n", p); | |
bf0fd768 CL |
1581 | } |
1582 | } | |
1583 | ||
d23c45fd CL |
1584 | if (!sloppy && invalid_option) |
1585 | return 0; | |
1586 | ||
571b7554 WAA |
1587 | if (mnt->minorversion && mnt->version != 4) |
1588 | goto out_minorversion_mismatch; | |
1589 | ||
ee671b01 JL |
1590 | /* |
1591 | * verify that any proto=/mountproto= options match the address | |
1592 | * familiies in the addr=/mountaddr= options. | |
1593 | */ | |
1594 | if (protofamily != AF_UNSPEC && | |
1595 | protofamily != mnt->nfs_server.address.ss_family) | |
1596 | goto out_proto_mismatch; | |
1597 | ||
1598 | if (mountfamily != AF_UNSPEC) { | |
1599 | if (mnt->mount_server.addrlen) { | |
1600 | if (mountfamily != mnt->mount_server.address.ss_family) | |
1601 | goto out_mountproto_mismatch; | |
1602 | } else { | |
1603 | if (mountfamily != mnt->nfs_server.address.ss_family) | |
1604 | goto out_mountproto_mismatch; | |
1605 | } | |
1606 | } | |
1607 | ||
bf0fd768 CL |
1608 | return 1; |
1609 | ||
ee671b01 JL |
1610 | out_mountproto_mismatch: |
1611 | printk(KERN_INFO "NFS: mount server address does not match mountproto= " | |
1612 | "option\n"); | |
1613 | return 0; | |
1614 | out_proto_mismatch: | |
1615 | printk(KERN_INFO "NFS: server address does not match proto= option\n"); | |
1616 | return 0; | |
53a0b9c4 CL |
1617 | out_invalid_address: |
1618 | printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); | |
1619 | return 0; | |
d23c45fd | 1620 | out_invalid_value: |
53a0b9c4 | 1621 | printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
d23c45fd | 1622 | return 0; |
571b7554 WAA |
1623 | out_minorversion_mismatch: |
1624 | printk(KERN_INFO "NFS: mount option vers=%u does not support " | |
1625 | "minorversion=%u\n", mnt->version, mnt->minorversion); | |
1626 | return 0; | |
bf0fd768 CL |
1627 | out_nomem: |
1628 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1629 | return 0; | |
f9c3a380 EP |
1630 | out_security_failure: |
1631 | free_secdata(secdata); | |
1632 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1633 | return 0; | |
bf0fd768 CL |
1634 | } |
1635 | ||
ec88f28d CL |
1636 | /* |
1637 | * Match the requested auth flavors with the list returned by | |
1638 | * the server. Returns zero and sets the mount's authentication | |
1639 | * flavor on success; returns -EACCES if server does not support | |
1640 | * the requested flavor. | |
1641 | */ | |
1642 | static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, | |
1643 | struct nfs_mount_request *request) | |
1644 | { | |
1645 | unsigned int i, j, server_authlist_len = *(request->auth_flav_len); | |
1646 | ||
5eecfde6 CL |
1647 | /* |
1648 | * Certain releases of Linux's mountd return an empty | |
1649 | * flavor list. To prevent behavioral regression with | |
1650 | * these servers (ie. rejecting mounts that used to | |
1651 | * succeed), revert to pre-2.6.32 behavior (no checking) | |
1652 | * if the returned flavor list is empty. | |
1653 | */ | |
1654 | if (server_authlist_len == 0) | |
1655 | return 0; | |
1656 | ||
ec88f28d CL |
1657 | /* |
1658 | * We avoid sophisticated negotiating here, as there are | |
1659 | * plenty of cases where we can get it wrong, providing | |
1660 | * either too little or too much security. | |
1661 | * | |
1662 | * RFC 2623, section 2.7 suggests we SHOULD prefer the | |
1663 | * flavor listed first. However, some servers list | |
1664 | * AUTH_NULL first. Our caller plants AUTH_SYS, the | |
1665 | * preferred default, in args->auth_flavors[0] if user | |
1666 | * didn't specify sec= mount option. | |
1667 | */ | |
1668 | for (i = 0; i < args->auth_flavor_len; i++) | |
1669 | for (j = 0; j < server_authlist_len; j++) | |
1670 | if (args->auth_flavors[i] == request->auth_flavs[j]) { | |
1671 | dfprintk(MOUNT, "NFS: using auth flavor %d\n", | |
1672 | request->auth_flavs[j]); | |
1673 | args->auth_flavors[0] = request->auth_flavs[j]; | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); | |
1678 | nfs_umount(request); | |
1679 | return -EACCES; | |
1680 | } | |
1681 | ||
0076d7b7 CL |
1682 | /* |
1683 | * Use the remote server's MOUNT service to request the NFS file handle | |
1684 | * corresponding to the provided path. | |
1685 | */ | |
486aa699 BS |
1686 | static int nfs_request_mount(struct nfs_parsed_mount_data *args, |
1687 | struct nfs_fh *root_fh) | |
0076d7b7 | 1688 | { |
ec88f28d CL |
1689 | rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
1690 | unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); | |
c5d120f8 CL |
1691 | struct nfs_mount_request request = { |
1692 | .sap = (struct sockaddr *) | |
1693 | &args->mount_server.address, | |
1694 | .dirpath = args->nfs_server.export_path, | |
1695 | .protocol = args->mount_server.protocol, | |
1696 | .fh = root_fh, | |
50a737f8 | 1697 | .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
ec88f28d CL |
1698 | .auth_flav_len = &server_authlist_len, |
1699 | .auth_flavs = server_authlist, | |
6d59b8d5 | 1700 | .net = args->net, |
c5d120f8 | 1701 | }; |
4c568017 | 1702 | int status; |
0076d7b7 CL |
1703 | |
1704 | if (args->mount_server.version == 0) { | |
8a6e5deb TM |
1705 | switch (args->version) { |
1706 | default: | |
1707 | args->mount_server.version = NFS_MNT3_VERSION; | |
1708 | break; | |
1709 | case 2: | |
1710 | args->mount_server.version = NFS_MNT_VERSION; | |
1711 | } | |
0076d7b7 | 1712 | } |
c5d120f8 | 1713 | request.version = args->mount_server.version; |
0076d7b7 | 1714 | |
33832034 | 1715 | if (args->mount_server.hostname) |
c5d120f8 | 1716 | request.hostname = args->mount_server.hostname; |
33832034 | 1717 | else |
c5d120f8 | 1718 | request.hostname = args->nfs_server.hostname; |
33832034 | 1719 | |
0076d7b7 CL |
1720 | /* |
1721 | * Construct the mount server's address. | |
1722 | */ | |
4c568017 | 1723 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
c5d120f8 | 1724 | memcpy(request.sap, &args->nfs_server.address, |
4c568017 CL |
1725 | args->nfs_server.addrlen); |
1726 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1727 | } | |
c5d120f8 | 1728 | request.salen = args->mount_server.addrlen; |
f5855fec | 1729 | nfs_set_port(request.sap, &args->mount_server.port, 0); |
0076d7b7 CL |
1730 | |
1731 | /* | |
1732 | * Now ask the mount server to map our export path | |
1733 | * to a file handle. | |
1734 | */ | |
c5d120f8 | 1735 | status = nfs_mount(&request); |
ec88f28d CL |
1736 | if (status != 0) { |
1737 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", | |
1738 | request.hostname, status); | |
1739 | return status; | |
1740 | } | |
0076d7b7 | 1741 | |
ec88f28d CL |
1742 | /* |
1743 | * MNTv1 (NFSv2) does not support auth flavor negotiation. | |
1744 | */ | |
1745 | if (args->mount_server.version != NFS_MNT3_VERSION) | |
1746 | return 0; | |
1747 | return nfs_walk_authlist(args, &request); | |
0076d7b7 CL |
1748 | } |
1749 | ||
486aa699 | 1750 | static struct dentry *nfs_try_mount(int flags, const char *dev_name, |
486aa699 BS |
1751 | struct nfs_mount_info *mount_info) |
1752 | { | |
1753 | int status; | |
1754 | struct nfs_server *server; | |
1755 | ||
b72e4f42 | 1756 | if (mount_info->parsed->need_mount) { |
87c7083d | 1757 | status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); |
b72e4f42 BS |
1758 | if (status) |
1759 | return ERR_PTR(status); | |
1760 | } | |
486aa699 BS |
1761 | |
1762 | /* Get a volume representation */ | |
87c7083d | 1763 | server = nfs_create_server(mount_info->parsed, mount_info->mntfh); |
486aa699 BS |
1764 | if (IS_ERR(server)) |
1765 | return ERR_CAST(server); | |
1766 | ||
87c7083d | 1767 | return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info); |
486aa699 BS |
1768 | } |
1769 | ||
c12bacec RL |
1770 | /* |
1771 | * Split "dev_name" into "hostname:export_path". | |
1772 | * | |
1773 | * The leftmost colon demarks the split between the server's hostname | |
1774 | * and the export path. If the hostname starts with a left square | |
1775 | * bracket, then it may contain colons. | |
1776 | * | |
1777 | * Note: caller frees hostname and export path, even on error. | |
1778 | */ | |
1779 | static int nfs_parse_devname(const char *dev_name, | |
1780 | char **hostname, size_t maxnamlen, | |
1781 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1782 | { |
1783 | size_t len; | |
c12bacec | 1784 | char *end; |
dc045898 | 1785 | |
c12bacec RL |
1786 | /* Is the host name protected with square brakcets? */ |
1787 | if (*dev_name == '[') { | |
1788 | end = strchr(++dev_name, ']'); | |
1789 | if (end == NULL || end[1] != ':') | |
dc045898 | 1790 | goto out_bad_devname; |
dc045898 | 1791 | |
c12bacec RL |
1792 | len = end - dev_name; |
1793 | end++; | |
1794 | } else { | |
1795 | char *comma; | |
dc045898 | 1796 | |
c12bacec RL |
1797 | end = strchr(dev_name, ':'); |
1798 | if (end == NULL) | |
1799 | goto out_bad_devname; | |
1800 | len = end - dev_name; | |
d1aa0825 | 1801 | |
c12bacec RL |
1802 | /* kill possible hostname list: not supported */ |
1803 | comma = strchr(dev_name, ','); | |
1804 | if (comma != NULL && comma < end) | |
1805 | *comma = 0; | |
1806 | } | |
d1aa0825 | 1807 | |
d1aa0825 CL |
1808 | if (len > maxnamlen) |
1809 | goto out_hostname; | |
1810 | ||
1811 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
c12bacec | 1812 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); |
d1aa0825 CL |
1813 | if (*hostname == NULL) |
1814 | goto out_nomem; | |
c12bacec | 1815 | len = strlen(++end); |
d1aa0825 CL |
1816 | if (len > maxpathlen) |
1817 | goto out_path; | |
1818 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1819 | if (!*export_path) | |
1820 | goto out_nomem; | |
1821 | ||
c12bacec | 1822 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); |
d1aa0825 CL |
1823 | return 0; |
1824 | ||
1825 | out_bad_devname: | |
1826 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1827 | return -EINVAL; | |
1828 | ||
1829 | out_nomem: | |
1830 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1831 | return -ENOMEM; | |
1832 | ||
1833 | out_hostname: | |
1834 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1835 | return -ENAMETOOLONG; | |
1836 | ||
1837 | out_path: | |
1838 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1839 | return -ENAMETOOLONG; | |
1840 | } | |
1841 | ||
f7b422b1 | 1842 | /* |
54ceac45 DH |
1843 | * Validate the NFS2/NFS3 mount data |
1844 | * - fills in the mount root filehandle | |
136d558c CL |
1845 | * |
1846 | * For option strings, user space handles the following behaviors: | |
1847 | * | |
1848 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1849 | * | |
1850 | * + failure mode: how to behave if a mount request can't be handled | |
1851 | * immediately ("fg/bg" option) | |
1852 | * | |
1853 | * + retry: how often to retry a mount request ("retry=" option) | |
1854 | * | |
1855 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1856 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1857 | */ |
d72c727c BS |
1858 | static int nfs23_validate_mount_data(void *options, |
1859 | struct nfs_parsed_mount_data *args, | |
1860 | struct nfs_fh *mntfh, | |
1861 | const char *dev_name) | |
f7b422b1 | 1862 | { |
2283f8d6 | 1863 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
4cfd74fc | 1864 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
136d558c | 1865 | |
5df36e78 CL |
1866 | if (data == NULL) |
1867 | goto out_no_data; | |
f7b422b1 | 1868 | |
c5afc8da | 1869 | args->version = NFS_DEFAULT_VERSION; |
54ceac45 | 1870 | switch (data->version) { |
5df36e78 CL |
1871 | case 1: |
1872 | data->namlen = 0; | |
1873 | case 2: | |
1874 | data->bsize = 0; | |
1875 | case 3: | |
1876 | if (data->flags & NFS_MOUNT_VER3) | |
1877 | goto out_no_v3; | |
1878 | data->root.size = NFS2_FHSIZE; | |
1879 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1880 | case 4: | |
1881 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1882 | goto out_no_sec; | |
1883 | case 5: | |
1884 | memset(data->context, 0, sizeof(data->context)); | |
1885 | case 6: | |
b7e24457 TM |
1886 | if (data->flags & NFS_MOUNT_VER3) { |
1887 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1888 | goto out_invalid_fh; | |
5df36e78 | 1889 | mntfh->size = data->root.size; |
764302cc CL |
1890 | args->version = 3; |
1891 | } else { | |
5df36e78 | 1892 | mntfh->size = NFS2_FHSIZE; |
764302cc CL |
1893 | args->version = 2; |
1894 | } | |
5df36e78 | 1895 | |
5df36e78 CL |
1896 | |
1897 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1898 | if (mntfh->size < sizeof(mntfh->data)) | |
1899 | memset(mntfh->data + mntfh->size, 0, | |
1900 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1901 | |
2283f8d6 TT |
1902 | /* |
1903 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1904 | * can deal with. | |
1905 | */ | |
ff3525a5 | 1906 | args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
d5eff1a3 | 1907 | args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
2283f8d6 TT |
1908 | args->rsize = data->rsize; |
1909 | args->wsize = data->wsize; | |
2283f8d6 TT |
1910 | args->timeo = data->timeo; |
1911 | args->retrans = data->retrans; | |
1912 | args->acregmin = data->acregmin; | |
1913 | args->acregmax = data->acregmax; | |
1914 | args->acdirmin = data->acdirmin; | |
1915 | args->acdirmax = data->acdirmax; | |
b72e4f42 | 1916 | args->need_mount = false; |
4c568017 | 1917 | |
4cfd74fc | 1918 | memcpy(sap, &data->addr, sizeof(data->addr)); |
4c568017 | 1919 | args->nfs_server.addrlen = sizeof(data->addr); |
4cfd74fc | 1920 | if (!nfs_verify_server_address(sap)) |
4c568017 CL |
1921 | goto out_no_address; |
1922 | ||
2283f8d6 | 1923 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1924 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1925 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1926 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1927 | args->namlen = data->namlen; | |
1928 | args->bsize = data->bsize; | |
dd07c947 CL |
1929 | |
1930 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1931 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1932 | if (!args->nfs_server.hostname) |
1933 | goto out_nomem; | |
f9c3a380 | 1934 | |
5eebde23 SJ |
1935 | if (!(data->flags & NFS_MOUNT_NONLM)) |
1936 | args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| | |
1937 | NFS_MOUNT_LOCAL_FCNTL); | |
1938 | else | |
1939 | args->flags |= (NFS_MOUNT_LOCAL_FLOCK| | |
1940 | NFS_MOUNT_LOCAL_FCNTL); | |
f9c3a380 EP |
1941 | /* |
1942 | * The legacy version 6 binary mount data from userspace has a | |
1943 | * field used only to transport selinux information into the | |
1944 | * the kernel. To continue to support that functionality we | |
1945 | * have a touch of selinux knowledge here in the NFS code. The | |
1946 | * userspace code converted context=blah to just blah so we are | |
1947 | * converting back to the full string selinux understands. | |
1948 | */ | |
1949 | if (data->context[0]){ | |
1950 | #ifdef CONFIG_SECURITY_SELINUX | |
1951 | int rc; | |
1952 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1953 | if (!opts_str) | |
1954 | return -ENOMEM; | |
1955 | strcpy(opts_str, "context="); | |
1956 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1957 | strcat(opts_str, &data->context[0]); | |
1958 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1959 | kfree(opts_str); | |
1960 | if (rc) | |
1961 | return rc; | |
1962 | #else | |
1963 | return -EINVAL; | |
1964 | #endif | |
1965 | } | |
1966 | ||
5df36e78 | 1967 | break; |
b72e4f42 BS |
1968 | default: |
1969 | return NFS_TEXT_DATA; | |
f7b422b1 | 1970 | } |
54ceac45 DH |
1971 | |
1972 | #ifndef CONFIG_NFS_V3 | |
8a6e5deb | 1973 | if (args->version == 3) |
5df36e78 CL |
1974 | goto out_v3_not_compiled; |
1975 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1976 | |
5df36e78 | 1977 | return 0; |
f7b422b1 | 1978 | |
5df36e78 CL |
1979 | out_no_data: |
1980 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1981 | return -EINVAL; | |
54ceac45 | 1982 | |
5df36e78 CL |
1983 | out_no_v3: |
1984 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1985 | data->version); | |
1986 | return -EINVAL; | |
f7b422b1 | 1987 | |
5df36e78 CL |
1988 | out_no_sec: |
1989 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1990 | return -EINVAL; | |
1991 | ||
5df36e78 CL |
1992 | #ifndef CONFIG_NFS_V3 |
1993 | out_v3_not_compiled: | |
1994 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1995 | return -EPROTONOSUPPORT; | |
1996 | #endif /* !CONFIG_NFS_V3 */ | |
1997 | ||
63649bd7 CG |
1998 | out_nomem: |
1999 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
2000 | return -ENOMEM; | |
2001 | ||
5df36e78 CL |
2002 | out_no_address: |
2003 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2004 | return -EINVAL; | |
2005 | ||
2006 | out_invalid_fh: | |
2007 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
2008 | return -EINVAL; | |
f7b422b1 DH |
2009 | } |
2010 | ||
d72c727c BS |
2011 | #ifdef CONFIG_NFS_V4 |
2012 | static int nfs_validate_mount_data(struct file_system_type *fs_type, | |
2013 | void *options, | |
2014 | struct nfs_parsed_mount_data *args, | |
2015 | struct nfs_fh *mntfh, | |
2016 | const char *dev_name) | |
2017 | { | |
2018 | if (fs_type == &nfs_fs_type) | |
2019 | return nfs23_validate_mount_data(options, args, mntfh, dev_name); | |
2020 | return nfs4_validate_mount_data(options, args, dev_name); | |
2021 | } | |
2022 | #else | |
2023 | static int nfs_validate_mount_data(struct file_system_type *fs_type, | |
2024 | void *options, | |
2025 | struct nfs_parsed_mount_data *args, | |
2026 | struct nfs_fh *mntfh, | |
2027 | const char *dev_name) | |
2028 | { | |
2029 | return nfs23_validate_mount_data(options, args, mntfh, dev_name); | |
2030 | } | |
2031 | #endif | |
2032 | ||
b72e4f42 BS |
2033 | static int nfs_validate_text_mount_data(void *options, |
2034 | struct nfs_parsed_mount_data *args, | |
2035 | const char *dev_name) | |
2036 | { | |
2037 | int port = 0; | |
2038 | int max_namelen = PAGE_SIZE; | |
2039 | int max_pathlen = NFS_MAXPATHLEN; | |
2040 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; | |
2041 | ||
2042 | if (nfs_parse_mount_options((char *)options, args) == 0) | |
2043 | return -EINVAL; | |
2044 | ||
2045 | if (!nfs_verify_server_address(sap)) | |
2046 | goto out_no_address; | |
2047 | ||
2048 | if (args->version == 4) { | |
2049 | #ifdef CONFIG_NFS_V4 | |
2050 | port = NFS_PORT; | |
2051 | max_namelen = NFS4_MAXNAMLEN; | |
2052 | max_pathlen = NFS4_MAXPATHLEN; | |
2053 | nfs_validate_transport_protocol(args); | |
2054 | nfs4_validate_mount_flags(args); | |
2055 | #else | |
2056 | goto out_v4_not_compiled; | |
2057 | #endif /* CONFIG_NFS_V4 */ | |
2058 | } else | |
2059 | nfs_set_mount_transport_protocol(args); | |
2060 | ||
2061 | nfs_set_port(sap, &args->nfs_server.port, port); | |
2062 | ||
2063 | if (args->auth_flavor_len > 1) | |
2064 | goto out_bad_auth; | |
2065 | ||
2066 | return nfs_parse_devname(dev_name, | |
2067 | &args->nfs_server.hostname, | |
2068 | max_namelen, | |
2069 | &args->nfs_server.export_path, | |
2070 | max_pathlen); | |
2071 | ||
2072 | #ifndef CONFIG_NFS_V4 | |
2073 | out_v4_not_compiled: | |
2074 | dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); | |
2075 | return -EPROTONOSUPPORT; | |
2076 | #endif /* !CONFIG_NFS_V4 */ | |
2077 | ||
2078 | out_no_address: | |
2079 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2080 | return -EINVAL; | |
2081 | ||
2082 | out_bad_auth: | |
2083 | dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); | |
2084 | return -EINVAL; | |
2085 | } | |
2086 | ||
48b605f8 JL |
2087 | static int |
2088 | nfs_compare_remount_data(struct nfs_server *nfss, | |
2089 | struct nfs_parsed_mount_data *data) | |
2090 | { | |
2091 | if (data->flags != nfss->flags || | |
2092 | data->rsize != nfss->rsize || | |
2093 | data->wsize != nfss->wsize || | |
2094 | data->retrans != nfss->client->cl_timeout->to_retries || | |
2095 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
2096 | data->acregmin != nfss->acregmin / HZ || | |
2097 | data->acregmax != nfss->acregmax / HZ || | |
2098 | data->acdirmin != nfss->acdirmin / HZ || | |
2099 | data->acdirmax != nfss->acdirmax / HZ || | |
2100 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
bcd2ea17 | 2101 | data->nfs_server.port != nfss->port || |
48b605f8 | 2102 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
a1be9eee SR |
2103 | !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
2104 | (struct sockaddr *)&nfss->nfs_client->cl_addr)) | |
48b605f8 JL |
2105 | return -EINVAL; |
2106 | ||
2107 | return 0; | |
2108 | } | |
2109 | ||
2110 | static int | |
2111 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
2112 | { | |
2113 | int error; | |
2114 | struct nfs_server *nfss = sb->s_fs_info; | |
2115 | struct nfs_parsed_mount_data *data; | |
2116 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
2117 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 2118 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
2119 | |
2120 | /* | |
2121 | * Userspace mount programs that send binary options generally send | |
2122 | * them populated with default values. We have no way to know which | |
2123 | * ones were explicitly specified. Fall back to legacy behavior and | |
2124 | * just return success. | |
2125 | */ | |
31c94469 MZ |
2126 | if ((nfsvers == 4 && (!options4 || options4->version == 1)) || |
2127 | (nfsvers <= 3 && (!options || (options->version >= 1 && | |
2128 | options->version <= 6)))) | |
48b605f8 JL |
2129 | return 0; |
2130 | ||
2131 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2132 | if (data == NULL) | |
2133 | return -ENOMEM; | |
2134 | ||
2135 | /* fill out struct with values from existing mount */ | |
2136 | data->flags = nfss->flags; | |
2137 | data->rsize = nfss->rsize; | |
2138 | data->wsize = nfss->wsize; | |
2139 | data->retrans = nfss->client->cl_timeout->to_retries; | |
2140 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
2141 | data->acregmin = nfss->acregmin / HZ; | |
2142 | data->acregmax = nfss->acregmax / HZ; | |
2143 | data->acdirmin = nfss->acdirmin / HZ; | |
2144 | data->acdirmax = nfss->acdirmax / HZ; | |
2145 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
bcd2ea17 | 2146 | data->nfs_server.port = nfss->port; |
48b605f8 JL |
2147 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
2148 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
2149 | data->nfs_server.addrlen); | |
2150 | ||
2151 | /* overwrite those values with any that were specified */ | |
2152 | error = nfs_parse_mount_options((char *)options, data); | |
2153 | if (error < 0) | |
2154 | goto out; | |
2155 | ||
26c4c170 JL |
2156 | /* |
2157 | * noac is a special case. It implies -o sync, but that's not | |
2158 | * necessarily reflected in the mtab options. do_remount_sb | |
2159 | * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the | |
2160 | * remount options, so we have to explicitly reset it. | |
2161 | */ | |
2162 | if (data->flags & NFS_MOUNT_NOAC) | |
2163 | *flags |= MS_SYNCHRONOUS; | |
2164 | ||
48b605f8 JL |
2165 | /* compare new mount options with old ones */ |
2166 | error = nfs_compare_remount_data(nfss, data); | |
2167 | out: | |
2168 | kfree(data); | |
2169 | return error; | |
2170 | } | |
2171 | ||
f7b422b1 | 2172 | /* |
54ceac45 | 2173 | * Initialise the common bits of the superblock |
f7b422b1 | 2174 | */ |
54ceac45 | 2175 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 2176 | { |
54ceac45 | 2177 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2178 | |
54ceac45 | 2179 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 2180 | |
54ceac45 DH |
2181 | /* We probably want something more informative here */ |
2182 | snprintf(sb->s_id, sizeof(sb->s_id), | |
5a7c9eec | 2183 | "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
5006a76c | 2184 | |
54ceac45 DH |
2185 | if (sb->s_blocksize == 0) |
2186 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
2187 | &sb->s_blocksize_bits); | |
f7b422b1 | 2188 | |
32a88aa1 JA |
2189 | sb->s_bdi = &server->backing_dev_info; |
2190 | ||
54ceac45 | 2191 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
2192 | } |
2193 | ||
2194 | /* | |
54ceac45 | 2195 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 2196 | */ |
2283f8d6 | 2197 | static void nfs_fill_super(struct super_block *sb, |
c40f8d1d | 2198 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2199 | { |
c40f8d1d | 2200 | struct nfs_parsed_mount_data *data = mount_info->parsed; |
f7b422b1 | 2201 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2202 | |
54ceac45 DH |
2203 | sb->s_blocksize_bits = 0; |
2204 | sb->s_blocksize = 0; | |
2205 | if (data->bsize) | |
2206 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 2207 | |
8a6e5deb | 2208 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2209 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2210 | * so ourselves when necessary. | |
2211 | */ | |
2212 | sb->s_flags |= MS_POSIXACL; | |
2213 | sb->s_time_gran = 1; | |
816724e6 | 2214 | } |
54ceac45 DH |
2215 | |
2216 | sb->s_op = &nfs_sops; | |
2217 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2218 | } |
2219 | ||
2220 | /* | |
54ceac45 | 2221 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 2222 | */ |
54ceac45 | 2223 | static void nfs_clone_super(struct super_block *sb, |
8c958e0c | 2224 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2225 | { |
8c958e0c | 2226 | const struct super_block *old_sb = mount_info->cloned->sb; |
54ceac45 DH |
2227 | struct nfs_server *server = NFS_SB(sb); |
2228 | ||
2229 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
2230 | sb->s_blocksize = old_sb->s_blocksize; | |
2231 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2232 | |
8a6e5deb | 2233 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2234 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2235 | * so ourselves when necessary. | |
f7b422b1 DH |
2236 | */ |
2237 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 2238 | sb->s_time_gran = 1; |
f7b422b1 DH |
2239 | } |
2240 | ||
54ceac45 DH |
2241 | sb->s_op = old_sb->s_op; |
2242 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2243 | } |
2244 | ||
275a5d24 TM |
2245 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) |
2246 | { | |
2247 | const struct nfs_server *a = s->s_fs_info; | |
2248 | const struct rpc_clnt *clnt_a = a->client; | |
2249 | const struct rpc_clnt *clnt_b = b->client; | |
2250 | ||
2251 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
2252 | goto Ebusy; | |
2253 | if (a->nfs_client != b->nfs_client) | |
2254 | goto Ebusy; | |
2255 | if (a->flags != b->flags) | |
2256 | goto Ebusy; | |
2257 | if (a->wsize != b->wsize) | |
2258 | goto Ebusy; | |
2259 | if (a->rsize != b->rsize) | |
2260 | goto Ebusy; | |
2261 | if (a->acregmin != b->acregmin) | |
2262 | goto Ebusy; | |
2263 | if (a->acregmax != b->acregmax) | |
2264 | goto Ebusy; | |
2265 | if (a->acdirmin != b->acdirmin) | |
2266 | goto Ebusy; | |
2267 | if (a->acdirmax != b->acdirmax) | |
2268 | goto Ebusy; | |
2269 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
2270 | goto Ebusy; | |
e89a5a43 | 2271 | return 1; |
275a5d24 | 2272 | Ebusy: |
e89a5a43 TM |
2273 | return 0; |
2274 | } | |
2275 | ||
2276 | struct nfs_sb_mountdata { | |
2277 | struct nfs_server *server; | |
2278 | int mntflags; | |
2279 | }; | |
2280 | ||
2281 | static int nfs_set_super(struct super_block *s, void *data) | |
2282 | { | |
2283 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2284 | struct nfs_server *server = sb_mntdata->server; | |
2285 | int ret; | |
2286 | ||
2287 | s->s_flags = sb_mntdata->mntflags; | |
2288 | s->s_fs_info = server; | |
8b244ff2 | 2289 | s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
e89a5a43 TM |
2290 | ret = set_anon_super(s, server); |
2291 | if (ret == 0) | |
2292 | server->s_dev = s->s_dev; | |
2293 | return ret; | |
2294 | } | |
2295 | ||
fd00a8ff CL |
2296 | static int nfs_compare_super_address(struct nfs_server *server1, |
2297 | struct nfs_server *server2) | |
2298 | { | |
2299 | struct sockaddr *sap1, *sap2; | |
2300 | ||
2301 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
2302 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
2303 | ||
2304 | if (sap1->sa_family != sap2->sa_family) | |
2305 | return 0; | |
2306 | ||
2307 | switch (sap1->sa_family) { | |
2308 | case AF_INET: { | |
2309 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
2310 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
2311 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
2312 | return 0; | |
2313 | if (sin1->sin_port != sin2->sin_port) | |
2314 | return 0; | |
2315 | break; | |
2316 | } | |
2317 | case AF_INET6: { | |
2318 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
2319 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
2320 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
2321 | return 0; | |
2322 | if (sin1->sin6_port != sin2->sin6_port) | |
2323 | return 0; | |
2324 | break; | |
2325 | } | |
2326 | default: | |
2327 | return 0; | |
2328 | } | |
2329 | ||
2330 | return 1; | |
2331 | } | |
2332 | ||
e89a5a43 TM |
2333 | static int nfs_compare_super(struct super_block *sb, void *data) |
2334 | { | |
2335 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2336 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
2337 | int mntflags = sb_mntdata->mntflags; | |
2338 | ||
fd00a8ff | 2339 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
2340 | return 0; |
2341 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
2342 | if (old->flags & NFS_MOUNT_UNSHARED) | |
2343 | return 0; | |
2344 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
2345 | return 0; | |
2346 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
2347 | } |
2348 | ||
39ffb921 | 2349 | #ifdef CONFIG_NFS_FSCACHE |
2311b943 BS |
2350 | static void nfs_get_cache_cookie(struct super_block *sb, |
2351 | struct nfs_parsed_mount_data *parsed, | |
2352 | struct nfs_clone_mount *cloned) | |
2353 | { | |
2354 | char *uniq = NULL; | |
2355 | int ulen = 0; | |
2356 | ||
2357 | if (parsed && parsed->fscache_uniq) { | |
2358 | uniq = parsed->fscache_uniq; | |
2359 | ulen = strlen(parsed->fscache_uniq); | |
2360 | } else if (cloned) { | |
2361 | struct nfs_server *mnt_s = NFS_SB(cloned->sb); | |
2362 | if (mnt_s->fscache_key) { | |
2363 | uniq = mnt_s->fscache_key->key.uniquifier; | |
2364 | ulen = mnt_s->fscache_key->key.uniq_len; | |
2365 | }; | |
2366 | } | |
2367 | ||
2368 | nfs_fscache_get_super_cookie(sb, uniq, ulen); | |
2369 | } | |
39ffb921 TM |
2370 | #else |
2371 | static void nfs_get_cache_cookie(struct super_block *sb, | |
2372 | struct nfs_parsed_mount_data *parsed, | |
2373 | struct nfs_clone_mount *cloned) | |
2374 | { | |
2375 | } | |
2376 | #endif | |
2311b943 | 2377 | |
fa799759 MS |
2378 | static int nfs_bdi_register(struct nfs_server *server) |
2379 | { | |
2380 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
2381 | } | |
2382 | ||
3d176e3f BS |
2383 | static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, |
2384 | struct nfs_mount_info *mount_info) | |
2385 | { | |
2386 | return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); | |
2387 | } | |
2388 | ||
2389 | static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, | |
2390 | struct nfs_mount_info *mount_info) | |
2391 | { | |
2392 | /* clone any lsm security options from the parent to the new sb */ | |
2393 | security_sb_clone_mnt_opts(mount_info->cloned->sb, s); | |
2394 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) | |
2395 | return -ESTALE; | |
2396 | return 0; | |
2397 | } | |
2398 | ||
c40f8d1d BS |
2399 | static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type, |
2400 | struct nfs_server *server, | |
2401 | int flags, const char *dev_name, | |
c40f8d1d | 2402 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2403 | { |
f7b422b1 | 2404 | struct super_block *s; |
01194981 | 2405 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
75180df2 | 2406 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2407 | struct nfs_sb_mountdata sb_mntdata = { |
2408 | .mntflags = flags, | |
c40f8d1d | 2409 | .server = server, |
e89a5a43 | 2410 | }; |
01194981 | 2411 | int error; |
33852a1f | 2412 | |
75180df2 TM |
2413 | if (server->flags & NFS_MOUNT_UNSHARED) |
2414 | compare_super = NULL; | |
2415 | ||
fb2088cc SP |
2416 | /* -o noac implies -o sync */ |
2417 | if (server->flags & NFS_MOUNT_NOAC) | |
2418 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2419 | ||
54ceac45 | 2420 | /* Get a superblock - note that we may end up sharing one that already exists */ |
9249e17f | 2421 | s = sget(fs_type, compare_super, nfs_set_super, flags, &sb_mntdata); |
816724e6 | 2422 | if (IS_ERR(s)) { |
01194981 | 2423 | mntroot = ERR_CAST(s); |
54ceac45 | 2424 | goto out_err_nosb; |
816724e6 TM |
2425 | } |
2426 | ||
54ceac45 DH |
2427 | if (s->s_fs_info != server) { |
2428 | nfs_free_server(server); | |
2429 | server = NULL; | |
fa799759 MS |
2430 | } else { |
2431 | error = nfs_bdi_register(server); | |
01194981 AV |
2432 | if (error) { |
2433 | mntroot = ERR_PTR(error); | |
cfbc0683 | 2434 | goto error_splat_bdi; |
01194981 | 2435 | } |
54ceac45 | 2436 | } |
f7b422b1 | 2437 | |
54ceac45 DH |
2438 | if (!s->s_root) { |
2439 | /* initial superblock/root creation */ | |
c40f8d1d | 2440 | mount_info->fill_super(s, mount_info); |
3d176e3f | 2441 | nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); |
54ceac45 | 2442 | } |
f7b422b1 | 2443 | |
87c7083d | 2444 | mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); |
01194981 | 2445 | if (IS_ERR(mntroot)) |
54ceac45 | 2446 | goto error_splat_super; |
816724e6 | 2447 | |
3d176e3f | 2448 | error = mount_info->set_security(s, mntroot, mount_info); |
f9c3a380 EP |
2449 | if (error) |
2450 | goto error_splat_root; | |
2451 | ||
54ceac45 | 2452 | s->s_flags |= MS_ACTIVE; |
0655960f CL |
2453 | |
2454 | out: | |
01194981 | 2455 | return mntroot; |
816724e6 | 2456 | |
54ceac45 DH |
2457 | out_err_nosb: |
2458 | nfs_free_server(server); | |
0655960f | 2459 | goto out; |
54ceac45 | 2460 | |
f9c3a380 EP |
2461 | error_splat_root: |
2462 | dput(mntroot); | |
01194981 | 2463 | mntroot = ERR_PTR(error); |
54ceac45 | 2464 | error_splat_super: |
cfbc0683 N |
2465 | if (server && !s->s_root) |
2466 | bdi_unregister(&server->backing_dev_info); | |
2467 | error_splat_bdi: | |
6f5bbff9 | 2468 | deactivate_locked_super(s); |
0655960f | 2469 | goto out; |
f7b422b1 DH |
2470 | } |
2471 | ||
c40f8d1d BS |
2472 | static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, |
2473 | int flags, const char *dev_name, void *raw_data) | |
2474 | { | |
c40f8d1d BS |
2475 | struct nfs_mount_info mount_info = { |
2476 | .fill_super = nfs_fill_super, | |
3d176e3f | 2477 | .set_security = nfs_set_sb_security, |
c40f8d1d | 2478 | }; |
c40f8d1d BS |
2479 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
2480 | int error; | |
2481 | ||
46058d46 | 2482 | mount_info.parsed = nfs_alloc_parsed_mount_data(); |
87c7083d BS |
2483 | mount_info.mntfh = nfs_alloc_fhandle(); |
2484 | if (mount_info.parsed == NULL || mount_info.mntfh == NULL) | |
c40f8d1d BS |
2485 | goto out; |
2486 | ||
2487 | /* Validate the mount data */ | |
87c7083d | 2488 | error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); |
b72e4f42 | 2489 | if (error == NFS_TEXT_DATA) |
46058d46 | 2490 | error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); |
c40f8d1d BS |
2491 | if (error < 0) { |
2492 | mntroot = ERR_PTR(error); | |
2493 | goto out; | |
2494 | } | |
c40f8d1d BS |
2495 | |
2496 | #ifdef CONFIG_NFS_V4 | |
46058d46 | 2497 | if (mount_info.parsed->version == 4) |
87c7083d | 2498 | mntroot = nfs4_try_mount(flags, dev_name, &mount_info); |
486aa699 | 2499 | else |
c40f8d1d | 2500 | #endif /* CONFIG_NFS_V4 */ |
87c7083d | 2501 | mntroot = nfs_try_mount(flags, dev_name, &mount_info); |
c40f8d1d | 2502 | |
c40f8d1d | 2503 | out: |
46058d46 | 2504 | nfs_free_parsed_mount_data(mount_info.parsed); |
87c7083d | 2505 | nfs_free_fhandle(mount_info.mntfh); |
c40f8d1d BS |
2506 | return mntroot; |
2507 | } | |
2508 | ||
387c149b TM |
2509 | /* |
2510 | * Ensure that we unregister the bdi before kill_anon_super | |
2511 | * releases the device name | |
2512 | */ | |
2513 | static void nfs_put_super(struct super_block *s) | |
2514 | { | |
2515 | struct nfs_server *server = NFS_SB(s); | |
2516 | ||
2517 | bdi_unregister(&server->backing_dev_info); | |
2518 | } | |
2519 | ||
54ceac45 DH |
2520 | /* |
2521 | * Destroy an NFS2/3 superblock | |
2522 | */ | |
f7b422b1 DH |
2523 | static void nfs_kill_super(struct super_block *s) |
2524 | { | |
2525 | struct nfs_server *server = NFS_SB(s); | |
2526 | ||
2527 | kill_anon_super(s); | |
08734048 | 2528 | nfs_fscache_release_super_cookie(s); |
54ceac45 | 2529 | nfs_free_server(server); |
f7b422b1 DH |
2530 | } |
2531 | ||
54ceac45 | 2532 | /* |
8c958e0c | 2533 | * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) |
54ceac45 | 2534 | */ |
31f43471 | 2535 | static struct dentry * |
8c958e0c BS |
2536 | nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, |
2537 | const char *dev_name, struct nfs_mount_info *mount_info) | |
f7b422b1 | 2538 | { |
8c958e0c | 2539 | struct nfs_clone_mount *data = mount_info->cloned; |
54ceac45 | 2540 | struct nfs_server *server; |
3d176e3f | 2541 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
54ceac45 | 2542 | int error; |
f7b422b1 | 2543 | |
8c958e0c | 2544 | dprintk("--> nfs_xdev_mount_common()\n"); |
f7b422b1 | 2545 | |
87c7083d BS |
2546 | mount_info->mntfh = data->fh; |
2547 | ||
54ceac45 | 2548 | /* create a new volume representation */ |
7e6eb683 | 2549 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); |
54ceac45 DH |
2550 | if (IS_ERR(server)) { |
2551 | error = PTR_ERR(server); | |
3d176e3f | 2552 | goto out_err; |
4c1fe2f7 | 2553 | } |
f7b422b1 | 2554 | |
87c7083d | 2555 | mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); |
8c958e0c | 2556 | dprintk("<-- nfs_xdev_mount_common() = 0\n"); |
3d176e3f | 2557 | out: |
31f43471 | 2558 | return mntroot; |
24c8dbbb | 2559 | |
3d176e3f | 2560 | out_err: |
8c958e0c | 2561 | dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); |
3d176e3f | 2562 | goto out; |
f7b422b1 DH |
2563 | } |
2564 | ||
8c958e0c BS |
2565 | /* |
2566 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2567 | */ | |
2568 | static struct dentry * | |
2569 | nfs_xdev_mount(struct file_system_type *fs_type, int flags, | |
2570 | const char *dev_name, void *raw_data) | |
2571 | { | |
2572 | struct nfs_mount_info mount_info = { | |
2573 | .fill_super = nfs_clone_super, | |
3d176e3f | 2574 | .set_security = nfs_clone_sb_security, |
8c958e0c BS |
2575 | .cloned = raw_data, |
2576 | }; | |
2577 | return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info); | |
2578 | } | |
2579 | ||
54ceac45 DH |
2580 | #ifdef CONFIG_NFS_V4 |
2581 | ||
f7b422b1 | 2582 | /* |
54ceac45 | 2583 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2584 | */ |
54ceac45 | 2585 | static void nfs4_clone_super(struct super_block *sb, |
8c958e0c | 2586 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2587 | { |
8c958e0c | 2588 | const struct super_block *old_sb = mount_info->cloned->sb; |
54ceac45 DH |
2589 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2590 | sb->s_blocksize = old_sb->s_blocksize; | |
2591 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2592 | sb->s_time_gran = 1; |
54ceac45 | 2593 | sb->s_op = old_sb->s_op; |
a8a5da99 AK |
2594 | /* |
2595 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2596 | * so ourselves when necessary. | |
2597 | */ | |
2598 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b AK |
2599 | sb->s_xattr = old_sb->s_xattr; |
2600 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2601 | } |
2602 | ||
54ceac45 DH |
2603 | /* |
2604 | * Set up an NFS4 superblock | |
2605 | */ | |
c40f8d1d BS |
2606 | static void nfs4_fill_super(struct super_block *sb, |
2607 | struct nfs_mount_info *mount_info) | |
f7b422b1 | 2608 | { |
54ceac45 DH |
2609 | sb->s_time_gran = 1; |
2610 | sb->s_op = &nfs4_sops; | |
a8a5da99 AK |
2611 | /* |
2612 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2613 | * so ourselves when necessary. | |
2614 | */ | |
2615 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b | 2616 | sb->s_xattr = nfs4_xattr_handlers; |
54ceac45 | 2617 | nfs_initialise_sb(sb); |
f7b422b1 DH |
2618 | } |
2619 | ||
01c3f052 TM |
2620 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
2621 | { | |
5eebde23 SJ |
2622 | args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
2623 | NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); | |
01c3f052 TM |
2624 | } |
2625 | ||
f0768ebd CL |
2626 | /* |
2627 | * Validate NFSv4 mount options | |
2628 | */ | |
91ea40b9 TT |
2629 | static int nfs4_validate_mount_data(void *options, |
2630 | struct nfs_parsed_mount_data *args, | |
2631 | const char *dev_name) | |
f0768ebd | 2632 | { |
4cfd74fc | 2633 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
91ea40b9 | 2634 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2635 | char *c; |
2636 | ||
2637 | if (data == NULL) | |
2638 | goto out_no_data; | |
2639 | ||
cdf66442 BS |
2640 | args->version = 4; |
2641 | ||
f0768ebd CL |
2642 | switch (data->version) { |
2643 | case 1: | |
4c568017 CL |
2644 | if (data->host_addrlen > sizeof(args->nfs_server.address)) |
2645 | goto out_no_address; | |
2646 | if (data->host_addrlen == 0) | |
f0768ebd | 2647 | goto out_no_address; |
4c568017 | 2648 | args->nfs_server.addrlen = data->host_addrlen; |
4cfd74fc | 2649 | if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
f0768ebd | 2650 | return -EFAULT; |
4cfd74fc | 2651 | if (!nfs_verify_server_address(sap)) |
f0768ebd CL |
2652 | goto out_no_address; |
2653 | ||
6738b251 CL |
2654 | if (data->auth_flavourlen) { |
2655 | if (data->auth_flavourlen > 1) | |
2656 | goto out_inval_auth; | |
20c71f5e | 2657 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2658 | data->auth_flavours, |
20c71f5e | 2659 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2660 | return -EFAULT; |
f0768ebd CL |
2661 | } |
2662 | ||
2663 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2664 | if (IS_ERR(c)) | |
2665 | return PTR_ERR(c); | |
91ea40b9 | 2666 | args->nfs_server.hostname = c; |
f0768ebd CL |
2667 | |
2668 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2669 | if (IS_ERR(c)) | |
2670 | return PTR_ERR(c); | |
91ea40b9 TT |
2671 | args->nfs_server.export_path = c; |
2672 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2673 | |
2674 | c = strndup_user(data->client_addr.data, 16); | |
2675 | if (IS_ERR(c)) | |
2676 | return PTR_ERR(c); | |
91ea40b9 TT |
2677 | args->client_address = c; |
2678 | ||
2679 | /* | |
2680 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2681 | * can deal with. | |
2682 | */ | |
2683 | ||
2684 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2685 | args->rsize = data->rsize; | |
2686 | args->wsize = data->wsize; | |
2687 | args->timeo = data->timeo; | |
2688 | args->retrans = data->retrans; | |
2689 | args->acregmin = data->acregmin; | |
2690 | args->acregmax = data->acregmax; | |
2691 | args->acdirmin = data->acdirmin; | |
2692 | args->acdirmax = data->acdirmax; | |
2693 | args->nfs_server.protocol = data->proto; | |
259875ef | 2694 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2695 | |
2696 | break; | |
7630c852 | 2697 | default: |
b72e4f42 | 2698 | return NFS_TEXT_DATA; |
f0768ebd CL |
2699 | } |
2700 | ||
2701 | return 0; | |
2702 | ||
2703 | out_no_data: | |
2704 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2705 | return -EINVAL; | |
2706 | ||
2707 | out_inval_auth: | |
2708 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2709 | data->auth_flavourlen); | |
2710 | return -EINVAL; | |
2711 | ||
2712 | out_no_address: | |
2713 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2714 | return -EINVAL; | |
f0768ebd CL |
2715 | } |
2716 | ||
54ceac45 | 2717 | /* |
c02d7adf | 2718 | * Get the superblock for the NFS4 root partition |
54ceac45 | 2719 | */ |
31f43471 AV |
2720 | static struct dentry * |
2721 | nfs4_remote_mount(struct file_system_type *fs_type, int flags, | |
87c7083d | 2722 | const char *dev_name, void *info) |
f7b422b1 | 2723 | { |
87c7083d | 2724 | struct nfs_mount_info *mount_info = info; |
54ceac45 | 2725 | struct nfs_server *server; |
c40f8d1d | 2726 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
33852a1f | 2727 | |
87c7083d BS |
2728 | mount_info->fill_super = nfs4_fill_super; |
2729 | mount_info->set_security = nfs_set_sb_security; | |
f9c3a380 | 2730 | |
54ceac45 | 2731 | /* Get a volume representation */ |
87c7083d | 2732 | server = nfs4_create_server(mount_info->parsed, mount_info->mntfh); |
54ceac45 | 2733 | if (IS_ERR(server)) { |
c40f8d1d | 2734 | mntroot = ERR_CAST(server); |
29eb981a | 2735 | goto out; |
f7b422b1 DH |
2736 | } |
2737 | ||
87c7083d | 2738 | mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); |
29eb981a CL |
2739 | |
2740 | out: | |
c40f8d1d | 2741 | return mntroot; |
f7b422b1 DH |
2742 | } |
2743 | ||
c02d7adf TM |
2744 | static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
2745 | int flags, void *data, const char *hostname) | |
2746 | { | |
2747 | struct vfsmount *root_mnt; | |
2748 | char *root_devname; | |
2749 | size_t len; | |
2750 | ||
98a2139f | 2751 | len = strlen(hostname) + 5; |
c02d7adf TM |
2752 | root_devname = kmalloc(len, GFP_KERNEL); |
2753 | if (root_devname == NULL) | |
2754 | return ERR_PTR(-ENOMEM); | |
98a2139f JK |
2755 | /* Does hostname needs to be enclosed in brackets? */ |
2756 | if (strchr(hostname, ':')) | |
2757 | snprintf(root_devname, len, "[%s]:/", hostname); | |
2758 | else | |
2759 | snprintf(root_devname, len, "%s:/", hostname); | |
c02d7adf TM |
2760 | root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); |
2761 | kfree(root_devname); | |
2762 | return root_mnt; | |
2763 | } | |
2764 | ||
ce587e07 TM |
2765 | struct nfs_referral_count { |
2766 | struct list_head list; | |
2767 | const struct task_struct *task; | |
2768 | unsigned int referral_count; | |
2769 | }; | |
2770 | ||
2771 | static LIST_HEAD(nfs_referral_count_list); | |
2772 | static DEFINE_SPINLOCK(nfs_referral_count_list_lock); | |
2773 | ||
2774 | static struct nfs_referral_count *nfs_find_referral_count(void) | |
2775 | { | |
2776 | struct nfs_referral_count *p; | |
2777 | ||
2778 | list_for_each_entry(p, &nfs_referral_count_list, list) { | |
2779 | if (p->task == current) | |
2780 | return p; | |
2781 | } | |
2782 | return NULL; | |
2783 | } | |
2784 | ||
2785 | #define NFS_MAX_NESTED_REFERRALS 2 | |
2786 | ||
2787 | static int nfs_referral_loop_protect(void) | |
2788 | { | |
2789 | struct nfs_referral_count *p, *new; | |
2790 | int ret = -ENOMEM; | |
2791 | ||
2792 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2793 | if (!new) | |
2794 | goto out; | |
2795 | new->task = current; | |
2796 | new->referral_count = 1; | |
2797 | ||
2798 | ret = 0; | |
2799 | spin_lock(&nfs_referral_count_list_lock); | |
2800 | p = nfs_find_referral_count(); | |
2801 | if (p != NULL) { | |
2802 | if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) | |
2803 | ret = -ELOOP; | |
2804 | else | |
2805 | p->referral_count++; | |
2806 | } else { | |
2807 | list_add(&new->list, &nfs_referral_count_list); | |
2808 | new = NULL; | |
2809 | } | |
2810 | spin_unlock(&nfs_referral_count_list_lock); | |
2811 | kfree(new); | |
2812 | out: | |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | static void nfs_referral_loop_unprotect(void) | |
2817 | { | |
2818 | struct nfs_referral_count *p; | |
2819 | ||
2820 | spin_lock(&nfs_referral_count_list_lock); | |
2821 | p = nfs_find_referral_count(); | |
2822 | p->referral_count--; | |
2823 | if (p->referral_count == 0) | |
2824 | list_del(&p->list); | |
2825 | else | |
2826 | p = NULL; | |
2827 | spin_unlock(&nfs_referral_count_list_lock); | |
2828 | kfree(p); | |
2829 | } | |
2830 | ||
01194981 AV |
2831 | static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, |
2832 | const char *export_path) | |
c02d7adf | 2833 | { |
01194981 | 2834 | struct dentry *dentry; |
5352d3b6 | 2835 | int err; |
c02d7adf | 2836 | |
5352d3b6 AV |
2837 | if (IS_ERR(root_mnt)) |
2838 | return ERR_CAST(root_mnt); | |
2839 | ||
2840 | err = nfs_referral_loop_protect(); | |
2841 | if (err) { | |
ea441d11 | 2842 | mntput(root_mnt); |
5352d3b6 | 2843 | return ERR_PTR(err); |
ea441d11 | 2844 | } |
c02d7adf | 2845 | |
ea441d11 AV |
2846 | dentry = mount_subtree(root_mnt, export_path); |
2847 | nfs_referral_loop_unprotect(); | |
c02d7adf | 2848 | |
01194981 | 2849 | return dentry; |
c02d7adf TM |
2850 | } |
2851 | ||
01194981 | 2852 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
87c7083d | 2853 | struct nfs_mount_info *mount_info) |
a6fe23be CL |
2854 | { |
2855 | char *export_path; | |
2856 | struct vfsmount *root_mnt; | |
01194981 | 2857 | struct dentry *res; |
87c7083d | 2858 | struct nfs_parsed_mount_data *data = mount_info->parsed; |
a6fe23be CL |
2859 | |
2860 | dfprintk(MOUNT, "--> nfs4_try_mount()\n"); | |
2861 | ||
f1daf666 TM |
2862 | mount_info->fill_super = nfs4_fill_super; |
2863 | ||
a6fe23be CL |
2864 | export_path = data->nfs_server.export_path; |
2865 | data->nfs_server.export_path = "/"; | |
87c7083d | 2866 | root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info, |
a6fe23be CL |
2867 | data->nfs_server.hostname); |
2868 | data->nfs_server.export_path = export_path; | |
2869 | ||
5352d3b6 | 2870 | res = nfs_follow_remote_path(root_mnt, export_path); |
a6fe23be | 2871 | |
01194981 AV |
2872 | dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", |
2873 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
2874 | IS_ERR(res) ? " [error]" : ""); | |
2875 | return res; | |
a6fe23be CL |
2876 | } |
2877 | ||
f7b422b1 | 2878 | /* |
54ceac45 | 2879 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2880 | */ |
31f43471 AV |
2881 | static struct dentry * |
2882 | nfs4_xdev_mount(struct file_system_type *fs_type, int flags, | |
2883 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2884 | { |
8c958e0c BS |
2885 | struct nfs_mount_info mount_info = { |
2886 | .fill_super = nfs4_clone_super, | |
3d176e3f | 2887 | .set_security = nfs_clone_sb_security, |
8c958e0c | 2888 | .cloned = raw_data, |
e89a5a43 | 2889 | }; |
8c958e0c | 2890 | return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info); |
f7b422b1 DH |
2891 | } |
2892 | ||
31f43471 AV |
2893 | static struct dentry * |
2894 | nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, | |
2895 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2896 | { |
21e4b82e BS |
2897 | struct nfs_mount_info mount_info = { |
2898 | .fill_super = nfs4_fill_super, | |
2899 | .set_security = nfs_clone_sb_security, | |
2900 | .cloned = raw_data, | |
2901 | }; | |
54ceac45 | 2902 | struct nfs_server *server; |
21e4b82e | 2903 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
54ceac45 DH |
2904 | |
2905 | dprintk("--> nfs4_referral_get_sb()\n"); | |
2906 | ||
87c7083d BS |
2907 | mount_info.mntfh = nfs_alloc_fhandle(); |
2908 | if (mount_info.cloned == NULL || mount_info.mntfh == NULL) | |
21e4b82e | 2909 | goto out; |
4f727296 | 2910 | |
54ceac45 | 2911 | /* create a new volume representation */ |
87c7083d | 2912 | server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh); |
54ceac45 | 2913 | if (IS_ERR(server)) { |
21e4b82e BS |
2914 | mntroot = ERR_CAST(server); |
2915 | goto out; | |
e9cc6c23 | 2916 | } |
54ceac45 | 2917 | |
87c7083d | 2918 | mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info); |
21e4b82e | 2919 | out: |
87c7083d | 2920 | nfs_free_fhandle(mount_info.mntfh); |
31f43471 | 2921 | return mntroot; |
f7b422b1 DH |
2922 | } |
2923 | ||
c02d7adf TM |
2924 | /* |
2925 | * Create an NFS4 server record on referral traversal | |
2926 | */ | |
01194981 AV |
2927 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
2928 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
2929 | { |
2930 | struct nfs_clone_mount *data = raw_data; | |
2931 | char *export_path; | |
2932 | struct vfsmount *root_mnt; | |
01194981 | 2933 | struct dentry *res; |
c02d7adf | 2934 | |
01194981 | 2935 | dprintk("--> nfs4_referral_mount()\n"); |
c02d7adf TM |
2936 | |
2937 | export_path = data->mnt_path; | |
2938 | data->mnt_path = "/"; | |
2939 | ||
2940 | root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, | |
2941 | flags, data, data->hostname); | |
2942 | data->mnt_path = export_path; | |
2943 | ||
5352d3b6 | 2944 | res = nfs_follow_remote_path(root_mnt, export_path); |
01194981 AV |
2945 | dprintk("<-- nfs4_referral_mount() = %ld%s\n", |
2946 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
2947 | IS_ERR(res) ? " [error]" : ""); | |
2948 | return res; | |
c02d7adf TM |
2949 | } |
2950 | ||
54ceac45 | 2951 | #endif /* CONFIG_NFS_V4 */ |