Commit | Line | Data |
---|---|---|
f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
526719ba | 8 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
f7b422b1 DH |
9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
10 | * | |
11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. | |
12 | * J.S.Peatfield@damtp.cam.ac.uk | |
13 | * | |
14 | * Split from inode.c by David Howells <dhowells@redhat.com> | |
15 | * | |
54ceac45 DH |
16 | * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
17 | * particular server are held in the same superblock | |
18 | * - NFS superblocks can have several effective roots to the dentry tree | |
19 | * - directory type roots are spliced into the tree when a path from one root reaches the root | |
20 | * of another (see nfs_lookup()) | |
f7b422b1 DH |
21 | */ |
22 | ||
f7b422b1 DH |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | ||
26 | #include <linux/time.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
34 | #include <linux/sunrpc/stats.h> | |
35 | #include <linux/sunrpc/metrics.h> | |
0896a725 | 36 | #include <linux/sunrpc/xprtsock.h> |
2cf7ff7a | 37 | #include <linux/sunrpc/xprtrdma.h> |
f7b422b1 DH |
38 | #include <linux/nfs_fs.h> |
39 | #include <linux/nfs_mount.h> | |
40 | #include <linux/nfs4_mount.h> | |
41 | #include <linux/lockd/bind.h> | |
f7b422b1 DH |
42 | #include <linux/seq_file.h> |
43 | #include <linux/mount.h> | |
c02d7adf | 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; |
c40f8d1d BS |
286 | }; |
287 | ||
42faad99 | 288 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 289 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
34c80b1d | 290 | static int nfs_show_options(struct seq_file *, struct dentry *); |
d861c630 | 291 | static int nfs_show_devname(struct seq_file *, struct dentry *); |
a6322de6 | 292 | static int nfs_show_path(struct seq_file *, struct dentry *); |
64132379 | 293 | static int nfs_show_stats(struct seq_file *, struct dentry *); |
486aa699 BS |
294 | static struct dentry *nfs_fs_mount_common(struct file_system_type *, |
295 | struct nfs_server *, int, const char *, struct nfs_fh *, | |
296 | 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 AV |
340 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
341 | struct nfs_parsed_mount_data *data); | |
342 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, | |
343 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
344 | static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
345 | int flags, const char *dev_name, void *raw_data); | |
346 | static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, | |
347 | int flags, const char *dev_name, void *raw_data); | |
01194981 AV |
348 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
349 | int flags, const char *dev_name, void *raw_data); | |
31f43471 AV |
350 | static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
351 | int flags, const char *dev_name, void *raw_data); | |
f7b422b1 DH |
352 | static void nfs4_kill_super(struct super_block *sb); |
353 | ||
354 | static struct file_system_type nfs4_fs_type = { | |
355 | .owner = THIS_MODULE, | |
356 | .name = "nfs4", | |
01194981 | 357 | .mount = nfs4_mount, |
f7b422b1 | 358 | .kill_sb = nfs4_kill_super, |
349457cc | 359 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
360 | }; |
361 | ||
c02d7adf TM |
362 | static struct file_system_type nfs4_remote_fs_type = { |
363 | .owner = THIS_MODULE, | |
364 | .name = "nfs4", | |
31f43471 | 365 | .mount = nfs4_remote_mount, |
c02d7adf TM |
366 | .kill_sb = nfs4_kill_super, |
367 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
368 | }; | |
369 | ||
54ceac45 | 370 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
371 | .owner = THIS_MODULE, |
372 | .name = "nfs4", | |
31f43471 | 373 | .mount = nfs4_xdev_mount, |
f7b422b1 | 374 | .kill_sb = nfs4_kill_super, |
349457cc | 375 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
376 | }; |
377 | ||
c02d7adf TM |
378 | static struct file_system_type nfs4_remote_referral_fs_type = { |
379 | .owner = THIS_MODULE, | |
380 | .name = "nfs4", | |
31f43471 | 381 | .mount = nfs4_remote_referral_mount, |
c02d7adf TM |
382 | .kill_sb = nfs4_kill_super, |
383 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
384 | }; | |
385 | ||
54ceac45 | 386 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
387 | .owner = THIS_MODULE, |
388 | .name = "nfs4", | |
01194981 | 389 | .mount = nfs4_referral_mount, |
f7b422b1 | 390 | .kill_sb = nfs4_kill_super, |
349457cc | 391 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
392 | }; |
393 | ||
ee9b6d61 | 394 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
395 | .alloc_inode = nfs_alloc_inode, |
396 | .destroy_inode = nfs_destroy_inode, | |
397 | .write_inode = nfs_write_inode, | |
387c149b | 398 | .put_super = nfs_put_super, |
f7b422b1 | 399 | .statfs = nfs_statfs, |
b57922d9 | 400 | .evict_inode = nfs4_evict_inode, |
f7b422b1 DH |
401 | .umount_begin = nfs_umount_begin, |
402 | .show_options = nfs_show_options, | |
c7f404b4 AV |
403 | .show_devname = nfs_show_devname, |
404 | .show_path = nfs_show_path, | |
f7b422b1 | 405 | .show_stats = nfs_show_stats, |
48b605f8 | 406 | .remount_fs = nfs_remount, |
f7b422b1 DH |
407 | }; |
408 | #endif | |
409 | ||
8e1f936b RR |
410 | static struct shrinker acl_shrinker = { |
411 | .shrink = nfs_access_cache_shrinker, | |
412 | .seeks = DEFAULT_SEEKS, | |
413 | }; | |
979df72e | 414 | |
f7b422b1 DH |
415 | /* |
416 | * Register the NFS filesystems | |
417 | */ | |
418 | int __init register_nfs_fs(void) | |
419 | { | |
420 | int ret; | |
421 | ||
422 | ret = register_filesystem(&nfs_fs_type); | |
423 | if (ret < 0) | |
424 | goto error_0; | |
425 | ||
f7b422b1 DH |
426 | ret = nfs_register_sysctl(); |
427 | if (ret < 0) | |
428 | goto error_1; | |
89a09141 | 429 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
430 | ret = register_filesystem(&nfs4_fs_type); |
431 | if (ret < 0) | |
432 | goto error_2; | |
433 | #endif | |
8e1f936b | 434 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
435 | return 0; |
436 | ||
437 | #ifdef CONFIG_NFS_V4 | |
438 | error_2: | |
439 | nfs_unregister_sysctl(); | |
89a09141 | 440 | #endif |
f7b422b1 DH |
441 | error_1: |
442 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
443 | error_0: |
444 | return ret; | |
445 | } | |
446 | ||
447 | /* | |
448 | * Unregister the NFS filesystems | |
449 | */ | |
450 | void __exit unregister_nfs_fs(void) | |
451 | { | |
8e1f936b | 452 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
453 | #ifdef CONFIG_NFS_V4 |
454 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 455 | #endif |
49af7ee1 | 456 | nfs_unregister_sysctl(); |
f7b422b1 DH |
457 | unregister_filesystem(&nfs_fs_type); |
458 | } | |
459 | ||
1daef0a8 | 460 | void nfs_sb_active(struct super_block *sb) |
ef818a28 | 461 | { |
1daef0a8 | 462 | struct nfs_server *server = NFS_SB(sb); |
ef818a28 | 463 | |
1daef0a8 TM |
464 | if (atomic_inc_return(&server->active) == 1) |
465 | atomic_inc(&sb->s_active); | |
ef818a28 SD |
466 | } |
467 | ||
1daef0a8 | 468 | void nfs_sb_deactive(struct super_block *sb) |
ef818a28 SD |
469 | { |
470 | struct nfs_server *server = NFS_SB(sb); | |
1daef0a8 TM |
471 | |
472 | if (atomic_dec_and_test(&server->active)) | |
473 | deactivate_super(sb); | |
ef818a28 SD |
474 | } |
475 | ||
f7b422b1 DH |
476 | /* |
477 | * Deliver file system statistics to userspace | |
478 | */ | |
816724e6 | 479 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 480 | { |
0c7d90cf | 481 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
482 | unsigned char blockbits; |
483 | unsigned long blockres; | |
0c7d90cf | 484 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
ca7e9a0d TM |
485 | struct nfs_fsstat res; |
486 | int error = -ENOMEM; | |
487 | ||
488 | res.fattr = nfs_alloc_fattr(); | |
489 | if (res.fattr == NULL) | |
490 | goto out_err; | |
f7b422b1 | 491 | |
8fa5c000 | 492 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
fbf3fdd2 MZ |
493 | if (unlikely(error == -ESTALE)) { |
494 | struct dentry *pd_dentry; | |
495 | ||
496 | pd_dentry = dget_parent(dentry); | |
497 | if (pd_dentry != NULL) { | |
498 | nfs_zap_caches(pd_dentry->d_inode); | |
499 | dput(pd_dentry); | |
500 | } | |
501 | } | |
ca7e9a0d | 502 | nfs_free_fattr(res.fattr); |
f7b422b1 DH |
503 | if (error < 0) |
504 | goto out_err; | |
ca7e9a0d | 505 | |
1a0ba9ae | 506 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
507 | |
508 | /* | |
509 | * Current versions of glibc do not correctly handle the | |
510 | * case where f_frsize != f_bsize. Eventually we want to | |
511 | * report the value of wtmult in this field. | |
512 | */ | |
0c7d90cf | 513 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
514 | |
515 | /* | |
516 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
517 | * are reported in units of f_frsize. Linux hasn't had | |
518 | * an f_frsize field in its statfs struct until recently, | |
519 | * thus historically Linux's sys_statfs reports these | |
520 | * fields in units of f_bsize. | |
521 | */ | |
0c7d90cf DH |
522 | buf->f_bsize = dentry->d_sb->s_blocksize; |
523 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
524 | blockres = (1 << blockbits) - 1; |
525 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
526 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
527 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
528 | ||
529 | buf->f_files = res.tfiles; | |
530 | buf->f_ffree = res.afiles; | |
531 | ||
532 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 533 | |
f7b422b1 DH |
534 | return 0; |
535 | ||
536 | out_err: | |
3110ff80 | 537 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 538 | return error; |
f7b422b1 DH |
539 | } |
540 | ||
7d4e2747 DH |
541 | /* |
542 | * Map the security flavour number to a name | |
543 | */ | |
81039f1f TM |
544 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
545 | { | |
7d4e2747 | 546 | static const struct { |
81039f1f TM |
547 | rpc_authflavor_t flavour; |
548 | const char *str; | |
549 | } sec_flavours[] = { | |
550 | { RPC_AUTH_NULL, "null" }, | |
551 | { RPC_AUTH_UNIX, "sys" }, | |
552 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
553 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
554 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
555 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
556 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
557 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
558 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
559 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
560 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 561 | { UINT_MAX, "unknown" } |
81039f1f TM |
562 | }; |
563 | int i; | |
564 | ||
4d81cd16 | 565 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
566 | if (sec_flavours[i].flavour == flavour) |
567 | break; | |
568 | } | |
569 | return sec_flavours[i].str; | |
570 | } | |
571 | ||
ee671b01 JL |
572 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
573 | int showdefaults) | |
574 | { | |
575 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; | |
576 | ||
577 | seq_printf(m, ",mountproto="); | |
578 | switch (sap->sa_family) { | |
579 | case AF_INET: | |
580 | switch (nfss->mountd_protocol) { | |
581 | case IPPROTO_UDP: | |
582 | seq_printf(m, RPCBIND_NETID_UDP); | |
583 | break; | |
584 | case IPPROTO_TCP: | |
585 | seq_printf(m, RPCBIND_NETID_TCP); | |
586 | break; | |
587 | default: | |
588 | if (showdefaults) | |
589 | seq_printf(m, "auto"); | |
590 | } | |
591 | break; | |
592 | case AF_INET6: | |
593 | switch (nfss->mountd_protocol) { | |
594 | case IPPROTO_UDP: | |
595 | seq_printf(m, RPCBIND_NETID_UDP6); | |
596 | break; | |
597 | case IPPROTO_TCP: | |
598 | seq_printf(m, RPCBIND_NETID_TCP6); | |
599 | break; | |
600 | default: | |
601 | if (showdefaults) | |
602 | seq_printf(m, "auto"); | |
603 | } | |
604 | break; | |
605 | default: | |
606 | if (showdefaults) | |
607 | seq_printf(m, "auto"); | |
608 | } | |
609 | } | |
610 | ||
82d101d5 CL |
611 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
612 | int showdefaults) | |
613 | { | |
614 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
615 | ||
d5eff1a3 BS |
616 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
617 | return; | |
618 | ||
82d101d5 CL |
619 | switch (sap->sa_family) { |
620 | case AF_INET: { | |
621 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
be859405 | 622 | seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
82d101d5 CL |
623 | break; |
624 | } | |
625 | case AF_INET6: { | |
626 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
d250e190 | 627 | seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
82d101d5 CL |
628 | break; |
629 | } | |
630 | default: | |
631 | if (showdefaults) | |
632 | seq_printf(m, ",mountaddr=unspecified"); | |
633 | } | |
634 | ||
635 | if (nfss->mountd_version || showdefaults) | |
636 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
aa699473 SK |
637 | if ((nfss->mountd_port && |
638 | nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || | |
639 | showdefaults) | |
82d101d5 CL |
640 | seq_printf(m, ",mountport=%u", nfss->mountd_port); |
641 | ||
ee671b01 | 642 | nfs_show_mountd_netid(m, nfss, showdefaults); |
82d101d5 CL |
643 | } |
644 | ||
0be8189f TM |
645 | #ifdef CONFIG_NFS_V4 |
646 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
647 | int showdefaults) | |
648 | { | |
649 | struct nfs_client *clp = nfss->nfs_client; | |
650 | ||
651 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
0be8189f TM |
652 | } |
653 | #else | |
654 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, | |
655 | int showdefaults) | |
656 | { | |
657 | } | |
658 | #endif | |
659 | ||
7bbceb6f TM |
660 | static void nfs_show_nfs_version(struct seq_file *m, |
661 | unsigned int version, | |
662 | unsigned int minorversion) | |
663 | { | |
664 | seq_printf(m, ",vers=%u", version); | |
665 | if (version == 4) | |
666 | seq_printf(m, ".%u", minorversion); | |
667 | } | |
668 | ||
f7b422b1 DH |
669 | /* |
670 | * Describe the mount options in force on this server representation | |
671 | */ | |
82d101d5 CL |
672 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
673 | int showdefaults) | |
f7b422b1 | 674 | { |
509de811 | 675 | static const struct proc_nfs_info { |
f7b422b1 | 676 | int flag; |
509de811 DH |
677 | const char *str; |
678 | const char *nostr; | |
f7b422b1 DH |
679 | } nfs_info[] = { |
680 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 | 681 | { NFS_MOUNT_POSIX, ",posix", "" }, |
f7b422b1 DH |
682 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
683 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
684 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
685 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 686 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
d740351b CL |
687 | { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
688 | { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, | |
f7b422b1 DH |
689 | { 0, NULL, NULL } |
690 | }; | |
509de811 | 691 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 692 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 693 | u32 version = clp->rpc_ops->version; |
7c563cc9 | 694 | int local_flock, local_fcntl; |
f7b422b1 | 695 | |
7bbceb6f | 696 | nfs_show_nfs_version(m, version, clp->cl_minorversion); |
2d767432 CL |
697 | seq_printf(m, ",rsize=%u", nfss->rsize); |
698 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
699 | if (nfss->bsize != 0) |
700 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
701 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 702 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 703 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 704 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 705 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 706 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 707 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 708 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 709 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
710 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
711 | if (nfss->flags & nfs_infop->flag) | |
712 | seq_puts(m, nfs_infop->str); | |
713 | else | |
714 | seq_puts(m, nfs_infop->nostr); | |
715 | } | |
2446ab60 | 716 | rcu_read_lock(); |
56928edd | 717 | seq_printf(m, ",proto=%s", |
ee671b01 | 718 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
2446ab60 | 719 | rcu_read_unlock(); |
82d101d5 CL |
720 | if (version == 4) { |
721 | if (nfss->port != NFS_PORT) | |
722 | seq_printf(m, ",port=%u", nfss->port); | |
723 | } else | |
724 | if (nfss->port) | |
725 | seq_printf(m, ",port=%u", nfss->port); | |
726 | ||
33170233 TM |
727 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
728 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 729 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
730 | |
731 | if (version != 4) | |
732 | nfs_show_mountd_options(m, nfss, showdefaults); | |
0be8189f TM |
733 | else |
734 | nfs_show_nfsv4_options(m, nfss, showdefaults); | |
82d101d5 | 735 | |
b797cac7 DH |
736 | if (nfss->options & NFS_OPTION_FSCACHE) |
737 | seq_printf(m, ",fsc"); | |
9b00c643 PL |
738 | |
739 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { | |
740 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) | |
741 | seq_printf(m, ",lookupcache=none"); | |
742 | else | |
743 | seq_printf(m, ",lookupcache=pos"); | |
744 | } | |
7c563cc9 SJ |
745 | |
746 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; | |
747 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; | |
748 | ||
749 | if (!local_flock && !local_fcntl) | |
750 | seq_printf(m, ",local_lock=none"); | |
751 | else if (local_flock && local_fcntl) | |
752 | seq_printf(m, ",local_lock=all"); | |
753 | else if (local_flock) | |
754 | seq_printf(m, ",local_lock=flock"); | |
755 | else | |
756 | seq_printf(m, ",local_lock=posix"); | |
f7b422b1 DH |
757 | } |
758 | ||
759 | /* | |
760 | * Describe the mount options on this VFS mountpoint | |
761 | */ | |
34c80b1d | 762 | static int nfs_show_options(struct seq_file *m, struct dentry *root) |
f7b422b1 | 763 | { |
34c80b1d | 764 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
765 | |
766 | nfs_show_mount_options(m, nfss, 0); | |
767 | ||
2446ab60 | 768 | rcu_read_lock(); |
5d8515ca CL |
769 | seq_printf(m, ",addr=%s", |
770 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
771 | RPC_DISPLAY_ADDR)); | |
2446ab60 | 772 | rcu_read_unlock(); |
f7b422b1 DH |
773 | |
774 | return 0; | |
775 | } | |
45402c38 HS |
776 | |
777 | #ifdef CONFIG_NFS_V4 | |
ae50c0b5 | 778 | #ifdef CONFIG_NFS_V4_1 |
45402c38 | 779 | static void show_sessions(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
780 | { |
781 | if (nfs4_has_session(server->nfs_client)) | |
782 | seq_printf(m, ",sessions"); | |
783 | } | |
784 | #else | |
45402c38 HS |
785 | static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
786 | #endif | |
ae50c0b5 BF |
787 | #endif |
788 | ||
789 | #ifdef CONFIG_NFS_V4_1 | |
45402c38 | 790 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
ae50c0b5 BF |
791 | { |
792 | seq_printf(m, ",pnfs="); | |
793 | if (server->pnfs_curr_ld) | |
794 | seq_printf(m, "%s", server->pnfs_curr_ld->name); | |
795 | else | |
796 | seq_printf(m, "not configured"); | |
797 | } | |
7e03b7cc TM |
798 | |
799 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) | |
800 | { | |
801 | if (nfss->nfs_client && nfss->nfs_client->impl_id) { | |
802 | struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id; | |
803 | seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," | |
804 | "date='%llu,%u'", | |
805 | impl_id->name, impl_id->domain, | |
806 | impl_id->date.seconds, impl_id->date.nseconds); | |
807 | } | |
808 | } | |
45402c38 | 809 | #else |
7e03b7cc TM |
810 | #ifdef CONFIG_NFS_V4 |
811 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) | |
812 | { | |
813 | } | |
45402c38 | 814 | #endif |
7e03b7cc TM |
815 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
816 | { | |
817 | } | |
45402c38 | 818 | #endif |
f7b422b1 | 819 | |
d861c630 | 820 | static int nfs_show_devname(struct seq_file *m, struct dentry *root) |
c7f404b4 AV |
821 | { |
822 | char *page = (char *) __get_free_page(GFP_KERNEL); | |
823 | char *devname, *dummy; | |
824 | int err = 0; | |
825 | if (!page) | |
826 | return -ENOMEM; | |
d861c630 | 827 | devname = nfs_path(&dummy, root, page, PAGE_SIZE); |
c7f404b4 AV |
828 | if (IS_ERR(devname)) |
829 | err = PTR_ERR(devname); | |
830 | else | |
831 | seq_escape(m, devname, " \t\n\\"); | |
832 | free_page((unsigned long)page); | |
833 | return err; | |
834 | } | |
835 | ||
a6322de6 | 836 | static int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
c7f404b4 AV |
837 | { |
838 | seq_puts(m, "/"); | |
839 | return 0; | |
840 | } | |
841 | ||
f7b422b1 DH |
842 | /* |
843 | * Present statistical information for this VFS mountpoint | |
844 | */ | |
64132379 | 845 | static int nfs_show_stats(struct seq_file *m, struct dentry *root) |
f7b422b1 DH |
846 | { |
847 | int i, cpu; | |
64132379 | 848 | struct nfs_server *nfss = NFS_SB(root->d_sb); |
f7b422b1 DH |
849 | struct rpc_auth *auth = nfss->client->cl_auth; |
850 | struct nfs_iostats totals = { }; | |
851 | ||
852 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
853 | ||
854 | /* | |
855 | * Display all mount option settings | |
856 | */ | |
857 | seq_printf(m, "\n\topts:\t"); | |
64132379 AV |
858 | seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); |
859 | seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
860 | seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
861 | seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
f7b422b1 DH |
862 | nfs_show_mount_options(m, nfss, 1); |
863 | ||
864 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
865 | ||
7e03b7cc | 866 | show_implementation_id(m, nfss); |
7d2ed9ac | 867 | |
f7b422b1 DH |
868 | seq_printf(m, "\n\tcaps:\t"); |
869 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
870 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
871 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
872 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
873 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
874 | |
875 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 876 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
877 | seq_printf(m, "\n\tnfsv4:\t"); |
878 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
879 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
880 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
ae50c0b5 BF |
881 | show_sessions(m, nfss); |
882 | show_pnfs(m, nfss); | |
f7b422b1 DH |
883 | } |
884 | #endif | |
885 | ||
886 | /* | |
887 | * Display security flavor in effect for this mount | |
888 | */ | |
2d767432 | 889 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 890 | if (auth->au_flavor) |
2d767432 | 891 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
892 | |
893 | /* | |
894 | * Display superblock I/O counters | |
895 | */ | |
896 | for_each_possible_cpu(cpu) { | |
897 | struct nfs_iostats *stats; | |
898 | ||
899 | preempt_disable(); | |
900 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
901 | ||
902 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
903 | totals.events[i] += stats->events[i]; | |
904 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
905 | totals.bytes[i] += stats->bytes[i]; | |
6a51091d DH |
906 | #ifdef CONFIG_NFS_FSCACHE |
907 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
908 | totals.fscache[i] += stats->fscache[i]; | |
909 | #endif | |
f7b422b1 DH |
910 | |
911 | preempt_enable(); | |
912 | } | |
913 | ||
914 | seq_printf(m, "\n\tevents:\t"); | |
915 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
916 | seq_printf(m, "%lu ", totals.events[i]); | |
917 | seq_printf(m, "\n\tbytes:\t"); | |
918 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
919 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
6a51091d DH |
920 | #ifdef CONFIG_NFS_FSCACHE |
921 | if (nfss->options & NFS_OPTION_FSCACHE) { | |
922 | seq_printf(m, "\n\tfsc:\t"); | |
923 | for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) | |
924 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
925 | } | |
926 | #endif | |
f7b422b1 DH |
927 | seq_printf(m, "\n"); |
928 | ||
929 | rpc_print_iostats(m, nfss->client); | |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 936 | * in response to xdev traversals and referrals |
f7b422b1 | 937 | */ |
42faad99 | 938 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 939 | { |
67e55205 | 940 | struct nfs_server *server; |
fc6ae3cf TM |
941 | struct rpc_clnt *rpc; |
942 | ||
67e55205 | 943 | server = NFS_SB(sb); |
fc6ae3cf TM |
944 | /* -EIO all pending I/O */ |
945 | rpc = server->client_acl; | |
946 | if (!IS_ERR(rpc)) | |
947 | rpc_killall_tasks(rpc); | |
948 | rpc = server->client; | |
949 | if (!IS_ERR(rpc)) | |
950 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
951 | } |
952 | ||
db833351 | 953 | static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) |
9423a08a CL |
954 | { |
955 | struct nfs_parsed_mount_data *data; | |
956 | ||
957 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
958 | if (data) { | |
9423a08a CL |
959 | data->acregmin = NFS_DEF_ACREGMIN; |
960 | data->acregmax = NFS_DEF_ACREGMAX; | |
961 | data->acdirmin = NFS_DEF_ACDIRMIN; | |
962 | data->acdirmax = NFS_DEF_ACDIRMAX; | |
c5811dbd | 963 | data->mount_server.port = NFS_UNSPEC_PORT; |
9423a08a | 964 | data->nfs_server.port = NFS_UNSPEC_PORT; |
c5811dbd | 965 | data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
9423a08a CL |
966 | data->auth_flavors[0] = RPC_AUTH_UNIX; |
967 | data->auth_flavor_len = 1; | |
968 | data->minorversion = 0; | |
b72e4f42 | 969 | data->need_mount = true; |
9937347a | 970 | data->net = current->nsproxy->net_ns; |
8a0d551a | 971 | security_init_mnt_opts(&data->lsm_opts); |
9423a08a CL |
972 | } |
973 | return data; | |
974 | } | |
975 | ||
8a0d551a JL |
976 | static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) |
977 | { | |
978 | if (data) { | |
979 | kfree(data->client_address); | |
980 | kfree(data->mount_server.hostname); | |
981 | kfree(data->nfs_server.export_path); | |
982 | kfree(data->nfs_server.hostname); | |
983 | kfree(data->fscache_uniq); | |
984 | security_free_mnt_opts(&data->lsm_opts); | |
985 | kfree(data); | |
986 | } | |
987 | } | |
988 | ||
fc50d58f | 989 | /* |
cdcd7f9a CL |
990 | * Sanity-check a server address provided by the mount command. |
991 | * | |
992 | * Address family must be initialized, and address must not be | |
993 | * the ANY address for that family. | |
fc50d58f CL |
994 | */ |
995 | static int nfs_verify_server_address(struct sockaddr *addr) | |
996 | { | |
997 | switch (addr->sa_family) { | |
998 | case AF_INET: { | |
cdcd7f9a | 999 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 1000 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
1001 | } |
1002 | case AF_INET6: { | |
1003 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
1004 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
1005 | } |
1006 | } | |
1007 | ||
53a0b9c4 | 1008 | dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
fc50d58f CL |
1009 | return 0; |
1010 | } | |
1011 | ||
4cfd74fc CL |
1012 | /* |
1013 | * Select between a default port value and a user-specified port value. | |
1014 | * If a zero value is set, then autobind will be used. | |
1015 | */ | |
f5855fec | 1016 | static void nfs_set_port(struct sockaddr *sap, int *port, |
4cfd74fc CL |
1017 | const unsigned short default_port) |
1018 | { | |
f5855fec TM |
1019 | if (*port == NFS_UNSPEC_PORT) |
1020 | *port = default_port; | |
4cfd74fc | 1021 | |
f5855fec | 1022 | rpc_set_port(sap, *port); |
4cfd74fc CL |
1023 | } |
1024 | ||
259875ef TM |
1025 | /* |
1026 | * Sanity check the NFS transport protocol. | |
1027 | * | |
1028 | */ | |
1029 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1030 | { | |
1031 | switch (mnt->nfs_server.protocol) { | |
1032 | case XPRT_TRANSPORT_UDP: | |
1033 | case XPRT_TRANSPORT_TCP: | |
1034 | case XPRT_TRANSPORT_RDMA: | |
1035 | break; | |
1036 | default: | |
1037 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
1043 | * settings should depend upon the specified NFS transport. | |
1044 | */ | |
1045 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
1046 | { | |
1047 | nfs_validate_transport_protocol(mnt); | |
1048 | ||
1049 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
1050 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
1051 | return; | |
1052 | switch (mnt->nfs_server.protocol) { | |
1053 | case XPRT_TRANSPORT_UDP: | |
1054 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
1055 | break; | |
1056 | case XPRT_TRANSPORT_TCP: | |
1057 | case XPRT_TRANSPORT_RDMA: | |
1058 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
1059 | } | |
1060 | } | |
1061 | ||
01060c89 CL |
1062 | /* |
1063 | * Parse the value of the 'sec=' option. | |
01060c89 CL |
1064 | */ |
1065 | static int nfs_parse_security_flavors(char *value, | |
1066 | struct nfs_parsed_mount_data *mnt) | |
1067 | { | |
1068 | substring_t args[MAX_OPT_ARGS]; | |
1069 | ||
1070 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
1071 | ||
1072 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
1073 | case Opt_sec_none: | |
01060c89 CL |
1074 | mnt->auth_flavors[0] = RPC_AUTH_NULL; |
1075 | break; | |
1076 | case Opt_sec_sys: | |
01060c89 CL |
1077 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
1078 | break; | |
1079 | case Opt_sec_krb5: | |
01060c89 CL |
1080 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
1081 | break; | |
1082 | case Opt_sec_krb5i: | |
01060c89 CL |
1083 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
1084 | break; | |
1085 | case Opt_sec_krb5p: | |
01060c89 CL |
1086 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
1087 | break; | |
1088 | case Opt_sec_lkey: | |
01060c89 CL |
1089 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
1090 | break; | |
1091 | case Opt_sec_lkeyi: | |
01060c89 CL |
1092 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
1093 | break; | |
1094 | case Opt_sec_lkeyp: | |
01060c89 CL |
1095 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
1096 | break; | |
1097 | case Opt_sec_spkm: | |
01060c89 CL |
1098 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
1099 | break; | |
1100 | case Opt_sec_spkmi: | |
01060c89 CL |
1101 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
1102 | break; | |
1103 | case Opt_sec_spkmp: | |
01060c89 CL |
1104 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
1105 | break; | |
1106 | default: | |
1107 | return 0; | |
1108 | } | |
1109 | ||
9b7160c5 | 1110 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
059f90b3 | 1111 | mnt->auth_flavor_len = 1; |
01060c89 CL |
1112 | return 1; |
1113 | } | |
1114 | ||
0d71b058 TM |
1115 | static int nfs_parse_version_string(char *string, |
1116 | struct nfs_parsed_mount_data *mnt, | |
1117 | substring_t *args) | |
1118 | { | |
1119 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1120 | switch (match_token(string, nfs_vers_tokens, args)) { | |
1121 | case Opt_vers_2: | |
1122 | mnt->version = 2; | |
1123 | break; | |
1124 | case Opt_vers_3: | |
1125 | mnt->flags |= NFS_MOUNT_VER3; | |
1126 | mnt->version = 3; | |
1127 | break; | |
1128 | case Opt_vers_4: | |
1129 | /* Backward compatibility option. In future, | |
1130 | * the mount program should always supply | |
1131 | * a NFSv4 minor version number. | |
1132 | */ | |
1133 | mnt->version = 4; | |
1134 | break; | |
1135 | case Opt_vers_4_0: | |
1136 | mnt->version = 4; | |
1137 | mnt->minorversion = 0; | |
1138 | break; | |
1139 | case Opt_vers_4_1: | |
1140 | mnt->version = 4; | |
1141 | mnt->minorversion = 1; | |
1142 | break; | |
1143 | default: | |
1144 | return 0; | |
1145 | } | |
1146 | return 1; | |
1147 | } | |
1148 | ||
c5cb09b6 RL |
1149 | static int nfs_get_option_str(substring_t args[], char **option) |
1150 | { | |
1151 | kfree(*option); | |
1152 | *option = match_strdup(args); | |
1153 | return !option; | |
1154 | } | |
1155 | ||
1156 | static int nfs_get_option_ul(substring_t args[], unsigned long *option) | |
1157 | { | |
1158 | int rc; | |
1159 | char *string; | |
1160 | ||
1161 | string = match_strdup(args); | |
1162 | if (string == NULL) | |
1163 | return -ENOMEM; | |
1164 | rc = strict_strtoul(string, 10, option); | |
1165 | kfree(string); | |
1166 | ||
1167 | return rc; | |
1168 | } | |
1169 | ||
bf0fd768 CL |
1170 | /* |
1171 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
1172 | * a data structure. The whole mount string is processed; bad options are |
1173 | * skipped as they are encountered. If there were no errors, return 1; | |
1174 | * otherwise return 0 (zero). | |
bf0fd768 CL |
1175 | */ |
1176 | static int nfs_parse_mount_options(char *raw, | |
1177 | struct nfs_parsed_mount_data *mnt) | |
1178 | { | |
f9c3a380 | 1179 | char *p, *string, *secdata; |
d23c45fd | 1180 | int rc, sloppy = 0, invalid_option = 0; |
ee671b01 JL |
1181 | unsigned short protofamily = AF_UNSPEC; |
1182 | unsigned short mountfamily = AF_UNSPEC; | |
bf0fd768 CL |
1183 | |
1184 | if (!raw) { | |
1185 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
1186 | return 1; | |
1187 | } | |
1188 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
1189 | ||
f9c3a380 EP |
1190 | secdata = alloc_secdata(); |
1191 | if (!secdata) | |
1192 | goto out_nomem; | |
1193 | ||
1194 | rc = security_sb_copy_data(raw, secdata); | |
1195 | if (rc) | |
1196 | goto out_security_failure; | |
1197 | ||
1198 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
1199 | if (rc) | |
1200 | goto out_security_failure; | |
1201 | ||
1202 | free_secdata(secdata); | |
1203 | ||
bf0fd768 CL |
1204 | while ((p = strsep(&raw, ",")) != NULL) { |
1205 | substring_t args[MAX_OPT_ARGS]; | |
a5a16bae CL |
1206 | unsigned long option; |
1207 | int token; | |
bf0fd768 CL |
1208 | |
1209 | if (!*p) | |
1210 | continue; | |
1211 | ||
1212 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
1213 | ||
1214 | token = match_token(p, nfs_mount_option_tokens, args); | |
1215 | switch (token) { | |
f45663ce CL |
1216 | |
1217 | /* | |
1218 | * boolean options: foo/nofoo | |
1219 | */ | |
bf0fd768 CL |
1220 | case Opt_soft: |
1221 | mnt->flags |= NFS_MOUNT_SOFT; | |
1222 | break; | |
1223 | case Opt_hard: | |
1224 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
1225 | break; | |
bf0fd768 CL |
1226 | case Opt_posix: |
1227 | mnt->flags |= NFS_MOUNT_POSIX; | |
1228 | break; | |
1229 | case Opt_noposix: | |
1230 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
1231 | break; | |
1232 | case Opt_cto: | |
1233 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
1234 | break; | |
1235 | case Opt_nocto: | |
1236 | mnt->flags |= NFS_MOUNT_NOCTO; | |
1237 | break; | |
1238 | case Opt_ac: | |
1239 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
1240 | break; | |
1241 | case Opt_noac: | |
1242 | mnt->flags |= NFS_MOUNT_NOAC; | |
1243 | break; | |
1244 | case Opt_lock: | |
1245 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1246 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
1247 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 CL |
1248 | break; |
1249 | case Opt_nolock: | |
1250 | mnt->flags |= NFS_MOUNT_NONLM; | |
5eebde23 SJ |
1251 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
1252 | NFS_MOUNT_LOCAL_FCNTL); | |
bf0fd768 | 1253 | break; |
bf0fd768 CL |
1254 | case Opt_udp: |
1255 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1256 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1257 | break; |
1258 | case Opt_tcp: | |
1259 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1260 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1261 | break; |
2cf7ff7a TT |
1262 | case Opt_rdma: |
1263 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1264 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1265 | xprt_load_transport(p); |
2cf7ff7a | 1266 | break; |
bf0fd768 CL |
1267 | case Opt_acl: |
1268 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1269 | break; | |
1270 | case Opt_noacl: | |
1271 | mnt->flags |= NFS_MOUNT_NOACL; | |
1272 | break; | |
1273 | case Opt_rdirplus: | |
1274 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1275 | break; | |
1276 | case Opt_nordirplus: | |
1277 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1278 | break; | |
75180df2 TM |
1279 | case Opt_sharecache: |
1280 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1281 | break; | |
1282 | case Opt_nosharecache: | |
1283 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1284 | break; | |
d740351b CL |
1285 | case Opt_resvport: |
1286 | mnt->flags &= ~NFS_MOUNT_NORESVPORT; | |
1287 | break; | |
1288 | case Opt_noresvport: | |
1289 | mnt->flags |= NFS_MOUNT_NORESVPORT; | |
1290 | break; | |
b797cac7 DH |
1291 | case Opt_fscache: |
1292 | mnt->options |= NFS_OPTION_FSCACHE; | |
1293 | kfree(mnt->fscache_uniq); | |
1294 | mnt->fscache_uniq = NULL; | |
1295 | break; | |
1296 | case Opt_nofscache: | |
1297 | mnt->options &= ~NFS_OPTION_FSCACHE; | |
1298 | kfree(mnt->fscache_uniq); | |
1299 | mnt->fscache_uniq = NULL; | |
1300 | break; | |
bf0fd768 | 1301 | |
f45663ce CL |
1302 | /* |
1303 | * options that take numeric values | |
1304 | */ | |
bf0fd768 | 1305 | case Opt_port: |
c5cb09b6 RL |
1306 | if (nfs_get_option_ul(args, &option) || |
1307 | option > USHRT_MAX) | |
d23c45fd CL |
1308 | goto out_invalid_value; |
1309 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1310 | break; |
1311 | case Opt_rsize: | |
c5cb09b6 | 1312 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1313 | goto out_invalid_value; |
1314 | mnt->rsize = option; | |
bf0fd768 CL |
1315 | break; |
1316 | case Opt_wsize: | |
c5cb09b6 | 1317 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1318 | goto out_invalid_value; |
1319 | mnt->wsize = option; | |
bf0fd768 CL |
1320 | break; |
1321 | case Opt_bsize: | |
c5cb09b6 | 1322 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1323 | goto out_invalid_value; |
1324 | mnt->bsize = option; | |
bf0fd768 CL |
1325 | break; |
1326 | case Opt_timeo: | |
c5cb09b6 | 1327 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1328 | goto out_invalid_value; |
1329 | mnt->timeo = option; | |
bf0fd768 CL |
1330 | break; |
1331 | case Opt_retrans: | |
c5cb09b6 | 1332 | if (nfs_get_option_ul(args, &option) || option == 0) |
d23c45fd CL |
1333 | goto out_invalid_value; |
1334 | mnt->retrans = option; | |
bf0fd768 CL |
1335 | break; |
1336 | case Opt_acregmin: | |
c5cb09b6 | 1337 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1338 | goto out_invalid_value; |
1339 | mnt->acregmin = option; | |
bf0fd768 CL |
1340 | break; |
1341 | case Opt_acregmax: | |
c5cb09b6 | 1342 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1343 | goto out_invalid_value; |
1344 | mnt->acregmax = option; | |
bf0fd768 CL |
1345 | break; |
1346 | case Opt_acdirmin: | |
c5cb09b6 | 1347 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1348 | goto out_invalid_value; |
1349 | mnt->acdirmin = option; | |
bf0fd768 CL |
1350 | break; |
1351 | case Opt_acdirmax: | |
c5cb09b6 | 1352 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1353 | goto out_invalid_value; |
1354 | mnt->acdirmax = option; | |
bf0fd768 CL |
1355 | break; |
1356 | case Opt_actimeo: | |
c5cb09b6 | 1357 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1358 | goto out_invalid_value; |
1359 | mnt->acregmin = mnt->acregmax = | |
1360 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1361 | break; |
1362 | case Opt_namelen: | |
c5cb09b6 | 1363 | if (nfs_get_option_ul(args, &option)) |
d23c45fd CL |
1364 | goto out_invalid_value; |
1365 | mnt->namlen = option; | |
bf0fd768 CL |
1366 | break; |
1367 | case Opt_mountport: | |
c5cb09b6 RL |
1368 | if (nfs_get_option_ul(args, &option) || |
1369 | option > USHRT_MAX) | |
d23c45fd CL |
1370 | goto out_invalid_value; |
1371 | mnt->mount_server.port = option; | |
bf0fd768 | 1372 | break; |
bf0fd768 | 1373 | case Opt_mountvers: |
c5cb09b6 | 1374 | if (nfs_get_option_ul(args, &option) || |
f45663ce | 1375 | option < NFS_MNT_VERSION || |
d23c45fd CL |
1376 | option > NFS_MNT3_VERSION) |
1377 | goto out_invalid_value; | |
1378 | mnt->mount_server.version = option; | |
bf0fd768 | 1379 | break; |
3fd5be9e | 1380 | case Opt_minorversion: |
c5cb09b6 | 1381 | if (nfs_get_option_ul(args, &option)) |
f3f4f4ed CL |
1382 | goto out_invalid_value; |
1383 | if (option > NFS4_MAX_MINOR_VERSION) | |
1384 | goto out_invalid_value; | |
1385 | mnt->minorversion = option; | |
3fd5be9e | 1386 | break; |
bf0fd768 | 1387 | |
f45663ce CL |
1388 | /* |
1389 | * options that take text values | |
1390 | */ | |
0d71b058 TM |
1391 | case Opt_nfsvers: |
1392 | string = match_strdup(args); | |
1393 | if (string == NULL) | |
1394 | goto out_nomem; | |
1395 | rc = nfs_parse_version_string(string, mnt, args); | |
1396 | kfree(string); | |
1397 | if (!rc) | |
1398 | goto out_invalid_value; | |
1399 | break; | |
bf0fd768 CL |
1400 | case Opt_sec: |
1401 | string = match_strdup(args); | |
1402 | if (string == NULL) | |
1403 | goto out_nomem; | |
01060c89 | 1404 | rc = nfs_parse_security_flavors(string, mnt); |
bf0fd768 | 1405 | kfree(string); |
f45663ce | 1406 | if (!rc) { |
f45663ce CL |
1407 | dfprintk(MOUNT, "NFS: unrecognized " |
1408 | "security flavor\n"); | |
d23c45fd | 1409 | return 0; |
f45663ce | 1410 | } |
bf0fd768 CL |
1411 | break; |
1412 | case Opt_proto: | |
1413 | string = match_strdup(args); | |
1414 | if (string == NULL) | |
1415 | goto out_nomem; | |
1416 | token = match_token(string, | |
1417 | nfs_xprt_protocol_tokens, args); | |
bf0fd768 | 1418 | |
ee671b01 | 1419 | protofamily = AF_INET; |
bf0fd768 | 1420 | switch (token) { |
ee671b01 JL |
1421 | case Opt_xprt_udp6: |
1422 | protofamily = AF_INET6; | |
fdb66ff4 | 1423 | case Opt_xprt_udp: |
bf0fd768 | 1424 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 1425 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1426 | break; |
ee671b01 JL |
1427 | case Opt_xprt_tcp6: |
1428 | protofamily = AF_INET6; | |
fdb66ff4 | 1429 | case Opt_xprt_tcp: |
bf0fd768 | 1430 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1431 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1432 | break; |
2cf7ff7a TT |
1433 | case Opt_xprt_rdma: |
1434 | /* vector side protocols to TCP */ | |
1435 | mnt->flags |= NFS_MOUNT_TCP; | |
1436 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
a67d18f8 | 1437 | xprt_load_transport(string); |
2cf7ff7a | 1438 | break; |
bf0fd768 | 1439 | default: |
f45663ce CL |
1440 | dfprintk(MOUNT, "NFS: unrecognized " |
1441 | "transport protocol\n"); | |
4223a4a1 | 1442 | kfree(string); |
d23c45fd | 1443 | return 0; |
bf0fd768 | 1444 | } |
c5cb09b6 | 1445 | kfree(string); |
bf0fd768 CL |
1446 | break; |
1447 | case Opt_mountproto: | |
1448 | string = match_strdup(args); | |
1449 | if (string == NULL) | |
1450 | goto out_nomem; | |
1451 | token = match_token(string, | |
1452 | nfs_xprt_protocol_tokens, args); | |
d508afb4 | 1453 | kfree(string); |
bf0fd768 | 1454 | |
ee671b01 | 1455 | mountfamily = AF_INET; |
bf0fd768 | 1456 | switch (token) { |
ee671b01 JL |
1457 | case Opt_xprt_udp6: |
1458 | mountfamily = AF_INET6; | |
fdb66ff4 | 1459 | case Opt_xprt_udp: |
0896a725 | 1460 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1461 | break; |
ee671b01 JL |
1462 | case Opt_xprt_tcp6: |
1463 | mountfamily = AF_INET6; | |
fdb66ff4 | 1464 | case Opt_xprt_tcp: |
0896a725 | 1465 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1466 | break; |
2cf7ff7a | 1467 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1468 | default: |
f45663ce CL |
1469 | dfprintk(MOUNT, "NFS: unrecognized " |
1470 | "transport protocol\n"); | |
d23c45fd | 1471 | return 0; |
bf0fd768 CL |
1472 | } |
1473 | break; | |
1474 | case Opt_addr: | |
1475 | string = match_strdup(args); | |
1476 | if (string == NULL) | |
1477 | goto out_nomem; | |
53a0b9c4 | 1478 | mnt->nfs_server.addrlen = |
b48e1278 | 1479 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1480 | (struct sockaddr *) |
1481 | &mnt->nfs_server.address, | |
1482 | sizeof(mnt->nfs_server.address)); | |
bf0fd768 | 1483 | kfree(string); |
53a0b9c4 CL |
1484 | if (mnt->nfs_server.addrlen == 0) |
1485 | goto out_invalid_address; | |
bf0fd768 CL |
1486 | break; |
1487 | case Opt_clientaddr: | |
c5cb09b6 | 1488 | if (nfs_get_option_str(args, &mnt->client_address)) |
bf0fd768 | 1489 | goto out_nomem; |
bf0fd768 | 1490 | break; |
33832034 | 1491 | case Opt_mounthost: |
c5cb09b6 RL |
1492 | if (nfs_get_option_str(args, |
1493 | &mnt->mount_server.hostname)) | |
33832034 | 1494 | goto out_nomem; |
33832034 | 1495 | break; |
0ac83779 | 1496 | case Opt_mountaddr: |
bf0fd768 CL |
1497 | string = match_strdup(args); |
1498 | if (string == NULL) | |
1499 | goto out_nomem; | |
53a0b9c4 | 1500 | mnt->mount_server.addrlen = |
b48e1278 | 1501 | rpc_pton(mnt->net, string, strlen(string), |
53a0b9c4 CL |
1502 | (struct sockaddr *) |
1503 | &mnt->mount_server.address, | |
1504 | sizeof(mnt->mount_server.address)); | |
bf0fd768 | 1505 | kfree(string); |
53a0b9c4 CL |
1506 | if (mnt->mount_server.addrlen == 0) |
1507 | goto out_invalid_address; | |
bf0fd768 | 1508 | break; |
7973c1f1 TM |
1509 | case Opt_lookupcache: |
1510 | string = match_strdup(args); | |
1511 | if (string == NULL) | |
1512 | goto out_nomem; | |
1513 | token = match_token(string, | |
1514 | nfs_lookupcache_tokens, args); | |
1515 | kfree(string); | |
1516 | switch (token) { | |
1517 | case Opt_lookupcache_all: | |
1518 | mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); | |
1519 | break; | |
1520 | case Opt_lookupcache_positive: | |
1521 | mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1522 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; | |
1523 | break; | |
1524 | case Opt_lookupcache_none: | |
1525 | mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; | |
1526 | break; | |
1527 | default: | |
7973c1f1 TM |
1528 | dfprintk(MOUNT, "NFS: invalid " |
1529 | "lookupcache argument\n"); | |
d23c45fd | 1530 | return 0; |
7973c1f1 TM |
1531 | }; |
1532 | break; | |
a6d5ff64 | 1533 | case Opt_fscache_uniq: |
c5cb09b6 | 1534 | if (nfs_get_option_str(args, &mnt->fscache_uniq)) |
a6d5ff64 | 1535 | goto out_nomem; |
a6d5ff64 CL |
1536 | mnt->options |= NFS_OPTION_FSCACHE; |
1537 | break; | |
5eebde23 SJ |
1538 | case Opt_local_lock: |
1539 | string = match_strdup(args); | |
1540 | if (string == NULL) | |
1541 | goto out_nomem; | |
1542 | token = match_token(string, nfs_local_lock_tokens, | |
1543 | args); | |
1544 | kfree(string); | |
1545 | switch (token) { | |
1546 | case Opt_local_lock_all: | |
1547 | mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | | |
1548 | NFS_MOUNT_LOCAL_FCNTL); | |
1549 | break; | |
1550 | case Opt_local_lock_flock: | |
1551 | mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; | |
1552 | break; | |
1553 | case Opt_local_lock_posix: | |
1554 | mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; | |
1555 | break; | |
1556 | case Opt_local_lock_none: | |
1557 | mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | | |
1558 | NFS_MOUNT_LOCAL_FCNTL); | |
1559 | break; | |
1560 | default: | |
1561 | dfprintk(MOUNT, "NFS: invalid " | |
1562 | "local_lock argument\n"); | |
1563 | return 0; | |
1564 | }; | |
1565 | break; | |
bf0fd768 | 1566 | |
f45663ce CL |
1567 | /* |
1568 | * Special options | |
1569 | */ | |
1570 | case Opt_sloppy: | |
1571 | sloppy = 1; | |
1572 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1573 | break; | |
bf0fd768 CL |
1574 | case Opt_userspace: |
1575 | case Opt_deprecated: | |
d33e4dfe CL |
1576 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1577 | "'%s'\n", p); | |
bf0fd768 CL |
1578 | break; |
1579 | ||
1580 | default: | |
d23c45fd | 1581 | invalid_option = 1; |
f45663ce CL |
1582 | dfprintk(MOUNT, "NFS: unrecognized mount option " |
1583 | "'%s'\n", p); | |
bf0fd768 CL |
1584 | } |
1585 | } | |
1586 | ||
d23c45fd CL |
1587 | if (!sloppy && invalid_option) |
1588 | return 0; | |
1589 | ||
571b7554 WAA |
1590 | if (mnt->minorversion && mnt->version != 4) |
1591 | goto out_minorversion_mismatch; | |
1592 | ||
ee671b01 JL |
1593 | /* |
1594 | * verify that any proto=/mountproto= options match the address | |
1595 | * familiies in the addr=/mountaddr= options. | |
1596 | */ | |
1597 | if (protofamily != AF_UNSPEC && | |
1598 | protofamily != mnt->nfs_server.address.ss_family) | |
1599 | goto out_proto_mismatch; | |
1600 | ||
1601 | if (mountfamily != AF_UNSPEC) { | |
1602 | if (mnt->mount_server.addrlen) { | |
1603 | if (mountfamily != mnt->mount_server.address.ss_family) | |
1604 | goto out_mountproto_mismatch; | |
1605 | } else { | |
1606 | if (mountfamily != mnt->nfs_server.address.ss_family) | |
1607 | goto out_mountproto_mismatch; | |
1608 | } | |
1609 | } | |
1610 | ||
bf0fd768 CL |
1611 | return 1; |
1612 | ||
ee671b01 JL |
1613 | out_mountproto_mismatch: |
1614 | printk(KERN_INFO "NFS: mount server address does not match mountproto= " | |
1615 | "option\n"); | |
1616 | return 0; | |
1617 | out_proto_mismatch: | |
1618 | printk(KERN_INFO "NFS: server address does not match proto= option\n"); | |
1619 | return 0; | |
53a0b9c4 CL |
1620 | out_invalid_address: |
1621 | printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); | |
1622 | return 0; | |
d23c45fd | 1623 | out_invalid_value: |
53a0b9c4 | 1624 | printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
d23c45fd | 1625 | return 0; |
571b7554 WAA |
1626 | out_minorversion_mismatch: |
1627 | printk(KERN_INFO "NFS: mount option vers=%u does not support " | |
1628 | "minorversion=%u\n", mnt->version, mnt->minorversion); | |
1629 | return 0; | |
bf0fd768 CL |
1630 | out_nomem: |
1631 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1632 | return 0; | |
f9c3a380 EP |
1633 | out_security_failure: |
1634 | free_secdata(secdata); | |
1635 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1636 | return 0; | |
bf0fd768 CL |
1637 | } |
1638 | ||
ec88f28d CL |
1639 | /* |
1640 | * Match the requested auth flavors with the list returned by | |
1641 | * the server. Returns zero and sets the mount's authentication | |
1642 | * flavor on success; returns -EACCES if server does not support | |
1643 | * the requested flavor. | |
1644 | */ | |
1645 | static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, | |
1646 | struct nfs_mount_request *request) | |
1647 | { | |
1648 | unsigned int i, j, server_authlist_len = *(request->auth_flav_len); | |
1649 | ||
5eecfde6 CL |
1650 | /* |
1651 | * Certain releases of Linux's mountd return an empty | |
1652 | * flavor list. To prevent behavioral regression with | |
1653 | * these servers (ie. rejecting mounts that used to | |
1654 | * succeed), revert to pre-2.6.32 behavior (no checking) | |
1655 | * if the returned flavor list is empty. | |
1656 | */ | |
1657 | if (server_authlist_len == 0) | |
1658 | return 0; | |
1659 | ||
ec88f28d CL |
1660 | /* |
1661 | * We avoid sophisticated negotiating here, as there are | |
1662 | * plenty of cases where we can get it wrong, providing | |
1663 | * either too little or too much security. | |
1664 | * | |
1665 | * RFC 2623, section 2.7 suggests we SHOULD prefer the | |
1666 | * flavor listed first. However, some servers list | |
1667 | * AUTH_NULL first. Our caller plants AUTH_SYS, the | |
1668 | * preferred default, in args->auth_flavors[0] if user | |
1669 | * didn't specify sec= mount option. | |
1670 | */ | |
1671 | for (i = 0; i < args->auth_flavor_len; i++) | |
1672 | for (j = 0; j < server_authlist_len; j++) | |
1673 | if (args->auth_flavors[i] == request->auth_flavs[j]) { | |
1674 | dfprintk(MOUNT, "NFS: using auth flavor %d\n", | |
1675 | request->auth_flavs[j]); | |
1676 | args->auth_flavors[0] = request->auth_flavs[j]; | |
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); | |
1681 | nfs_umount(request); | |
1682 | return -EACCES; | |
1683 | } | |
1684 | ||
0076d7b7 CL |
1685 | /* |
1686 | * Use the remote server's MOUNT service to request the NFS file handle | |
1687 | * corresponding to the provided path. | |
1688 | */ | |
486aa699 BS |
1689 | static int nfs_request_mount(struct nfs_parsed_mount_data *args, |
1690 | struct nfs_fh *root_fh) | |
0076d7b7 | 1691 | { |
ec88f28d CL |
1692 | rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
1693 | unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); | |
c5d120f8 CL |
1694 | struct nfs_mount_request request = { |
1695 | .sap = (struct sockaddr *) | |
1696 | &args->mount_server.address, | |
1697 | .dirpath = args->nfs_server.export_path, | |
1698 | .protocol = args->mount_server.protocol, | |
1699 | .fh = root_fh, | |
50a737f8 | 1700 | .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
ec88f28d CL |
1701 | .auth_flav_len = &server_authlist_len, |
1702 | .auth_flavs = server_authlist, | |
6d59b8d5 | 1703 | .net = args->net, |
c5d120f8 | 1704 | }; |
4c568017 | 1705 | int status; |
0076d7b7 CL |
1706 | |
1707 | if (args->mount_server.version == 0) { | |
8a6e5deb TM |
1708 | switch (args->version) { |
1709 | default: | |
1710 | args->mount_server.version = NFS_MNT3_VERSION; | |
1711 | break; | |
1712 | case 2: | |
1713 | args->mount_server.version = NFS_MNT_VERSION; | |
1714 | } | |
0076d7b7 | 1715 | } |
c5d120f8 | 1716 | request.version = args->mount_server.version; |
0076d7b7 | 1717 | |
33832034 | 1718 | if (args->mount_server.hostname) |
c5d120f8 | 1719 | request.hostname = args->mount_server.hostname; |
33832034 | 1720 | else |
c5d120f8 | 1721 | request.hostname = args->nfs_server.hostname; |
33832034 | 1722 | |
0076d7b7 CL |
1723 | /* |
1724 | * Construct the mount server's address. | |
1725 | */ | |
4c568017 | 1726 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
c5d120f8 | 1727 | memcpy(request.sap, &args->nfs_server.address, |
4c568017 CL |
1728 | args->nfs_server.addrlen); |
1729 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1730 | } | |
c5d120f8 | 1731 | request.salen = args->mount_server.addrlen; |
f5855fec | 1732 | nfs_set_port(request.sap, &args->mount_server.port, 0); |
0076d7b7 CL |
1733 | |
1734 | /* | |
1735 | * Now ask the mount server to map our export path | |
1736 | * to a file handle. | |
1737 | */ | |
c5d120f8 | 1738 | status = nfs_mount(&request); |
ec88f28d CL |
1739 | if (status != 0) { |
1740 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", | |
1741 | request.hostname, status); | |
1742 | return status; | |
1743 | } | |
0076d7b7 | 1744 | |
ec88f28d CL |
1745 | /* |
1746 | * MNTv1 (NFSv2) does not support auth flavor negotiation. | |
1747 | */ | |
1748 | if (args->mount_server.version != NFS_MNT3_VERSION) | |
1749 | return 0; | |
1750 | return nfs_walk_authlist(args, &request); | |
0076d7b7 CL |
1751 | } |
1752 | ||
486aa699 BS |
1753 | static struct dentry *nfs_try_mount(int flags, const char *dev_name, |
1754 | struct nfs_fh *mntfh, | |
1755 | struct nfs_mount_info *mount_info) | |
1756 | { | |
1757 | int status; | |
1758 | struct nfs_server *server; | |
1759 | ||
b72e4f42 BS |
1760 | if (mount_info->parsed->need_mount) { |
1761 | status = nfs_request_mount(mount_info->parsed, mntfh); | |
1762 | if (status) | |
1763 | return ERR_PTR(status); | |
1764 | } | |
486aa699 BS |
1765 | |
1766 | /* Get a volume representation */ | |
1767 | server = nfs_create_server(mount_info->parsed, mntfh); | |
1768 | if (IS_ERR(server)) | |
1769 | return ERR_CAST(server); | |
1770 | ||
1771 | return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mntfh, mount_info); | |
1772 | } | |
1773 | ||
c12bacec RL |
1774 | /* |
1775 | * Split "dev_name" into "hostname:export_path". | |
1776 | * | |
1777 | * The leftmost colon demarks the split between the server's hostname | |
1778 | * and the export path. If the hostname starts with a left square | |
1779 | * bracket, then it may contain colons. | |
1780 | * | |
1781 | * Note: caller frees hostname and export path, even on error. | |
1782 | */ | |
1783 | static int nfs_parse_devname(const char *dev_name, | |
1784 | char **hostname, size_t maxnamlen, | |
1785 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1786 | { |
1787 | size_t len; | |
c12bacec | 1788 | char *end; |
dc045898 | 1789 | |
c12bacec RL |
1790 | /* Is the host name protected with square brakcets? */ |
1791 | if (*dev_name == '[') { | |
1792 | end = strchr(++dev_name, ']'); | |
1793 | if (end == NULL || end[1] != ':') | |
dc045898 | 1794 | goto out_bad_devname; |
dc045898 | 1795 | |
c12bacec RL |
1796 | len = end - dev_name; |
1797 | end++; | |
1798 | } else { | |
1799 | char *comma; | |
dc045898 | 1800 | |
c12bacec RL |
1801 | end = strchr(dev_name, ':'); |
1802 | if (end == NULL) | |
1803 | goto out_bad_devname; | |
1804 | len = end - dev_name; | |
d1aa0825 | 1805 | |
c12bacec RL |
1806 | /* kill possible hostname list: not supported */ |
1807 | comma = strchr(dev_name, ','); | |
1808 | if (comma != NULL && comma < end) | |
1809 | *comma = 0; | |
1810 | } | |
d1aa0825 | 1811 | |
d1aa0825 CL |
1812 | if (len > maxnamlen) |
1813 | goto out_hostname; | |
1814 | ||
1815 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
c12bacec | 1816 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); |
d1aa0825 CL |
1817 | if (*hostname == NULL) |
1818 | goto out_nomem; | |
c12bacec | 1819 | len = strlen(++end); |
d1aa0825 CL |
1820 | if (len > maxpathlen) |
1821 | goto out_path; | |
1822 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1823 | if (!*export_path) | |
1824 | goto out_nomem; | |
1825 | ||
c12bacec | 1826 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); |
d1aa0825 CL |
1827 | return 0; |
1828 | ||
1829 | out_bad_devname: | |
1830 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1831 | return -EINVAL; | |
1832 | ||
1833 | out_nomem: | |
1834 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1835 | return -ENOMEM; | |
1836 | ||
1837 | out_hostname: | |
1838 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1839 | return -ENAMETOOLONG; | |
1840 | ||
1841 | out_path: | |
1842 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1843 | return -ENAMETOOLONG; | |
1844 | } | |
1845 | ||
f7b422b1 | 1846 | /* |
54ceac45 DH |
1847 | * Validate the NFS2/NFS3 mount data |
1848 | * - fills in the mount root filehandle | |
136d558c CL |
1849 | * |
1850 | * For option strings, user space handles the following behaviors: | |
1851 | * | |
1852 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1853 | * | |
1854 | * + failure mode: how to behave if a mount request can't be handled | |
1855 | * immediately ("fg/bg" option) | |
1856 | * | |
1857 | * + retry: how often to retry a mount request ("retry=" option) | |
1858 | * | |
1859 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1860 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1861 | */ |
d72c727c BS |
1862 | static int nfs23_validate_mount_data(void *options, |
1863 | struct nfs_parsed_mount_data *args, | |
1864 | struct nfs_fh *mntfh, | |
1865 | const char *dev_name) | |
f7b422b1 | 1866 | { |
2283f8d6 | 1867 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
4cfd74fc | 1868 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
136d558c | 1869 | |
5df36e78 CL |
1870 | if (data == NULL) |
1871 | goto out_no_data; | |
f7b422b1 | 1872 | |
54ceac45 | 1873 | switch (data->version) { |
5df36e78 CL |
1874 | case 1: |
1875 | data->namlen = 0; | |
1876 | case 2: | |
1877 | data->bsize = 0; | |
1878 | case 3: | |
1879 | if (data->flags & NFS_MOUNT_VER3) | |
1880 | goto out_no_v3; | |
1881 | data->root.size = NFS2_FHSIZE; | |
1882 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1883 | case 4: | |
1884 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1885 | goto out_no_sec; | |
1886 | case 5: | |
1887 | memset(data->context, 0, sizeof(data->context)); | |
1888 | case 6: | |
b7e24457 TM |
1889 | if (data->flags & NFS_MOUNT_VER3) { |
1890 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1891 | goto out_invalid_fh; | |
5df36e78 | 1892 | mntfh->size = data->root.size; |
764302cc CL |
1893 | args->version = 3; |
1894 | } else { | |
5df36e78 | 1895 | mntfh->size = NFS2_FHSIZE; |
764302cc CL |
1896 | args->version = 2; |
1897 | } | |
5df36e78 | 1898 | |
5df36e78 CL |
1899 | |
1900 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1901 | if (mntfh->size < sizeof(mntfh->data)) | |
1902 | memset(mntfh->data + mntfh->size, 0, | |
1903 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1904 | |
2283f8d6 TT |
1905 | /* |
1906 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1907 | * can deal with. | |
1908 | */ | |
ff3525a5 | 1909 | args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
d5eff1a3 | 1910 | args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
2283f8d6 TT |
1911 | args->rsize = data->rsize; |
1912 | args->wsize = data->wsize; | |
2283f8d6 TT |
1913 | args->timeo = data->timeo; |
1914 | args->retrans = data->retrans; | |
1915 | args->acregmin = data->acregmin; | |
1916 | args->acregmax = data->acregmax; | |
1917 | args->acdirmin = data->acdirmin; | |
1918 | args->acdirmax = data->acdirmax; | |
b72e4f42 | 1919 | args->need_mount = false; |
4c568017 | 1920 | |
4cfd74fc | 1921 | memcpy(sap, &data->addr, sizeof(data->addr)); |
4c568017 | 1922 | args->nfs_server.addrlen = sizeof(data->addr); |
4cfd74fc | 1923 | if (!nfs_verify_server_address(sap)) |
4c568017 CL |
1924 | goto out_no_address; |
1925 | ||
2283f8d6 | 1926 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1927 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1928 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1929 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1930 | args->namlen = data->namlen; | |
1931 | args->bsize = data->bsize; | |
dd07c947 CL |
1932 | |
1933 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1934 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1935 | if (!args->nfs_server.hostname) |
1936 | goto out_nomem; | |
f9c3a380 | 1937 | |
5eebde23 SJ |
1938 | if (!(data->flags & NFS_MOUNT_NONLM)) |
1939 | args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| | |
1940 | NFS_MOUNT_LOCAL_FCNTL); | |
1941 | else | |
1942 | args->flags |= (NFS_MOUNT_LOCAL_FLOCK| | |
1943 | NFS_MOUNT_LOCAL_FCNTL); | |
f9c3a380 EP |
1944 | /* |
1945 | * The legacy version 6 binary mount data from userspace has a | |
1946 | * field used only to transport selinux information into the | |
1947 | * the kernel. To continue to support that functionality we | |
1948 | * have a touch of selinux knowledge here in the NFS code. The | |
1949 | * userspace code converted context=blah to just blah so we are | |
1950 | * converting back to the full string selinux understands. | |
1951 | */ | |
1952 | if (data->context[0]){ | |
1953 | #ifdef CONFIG_SECURITY_SELINUX | |
1954 | int rc; | |
1955 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1956 | if (!opts_str) | |
1957 | return -ENOMEM; | |
1958 | strcpy(opts_str, "context="); | |
1959 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1960 | strcat(opts_str, &data->context[0]); | |
1961 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1962 | kfree(opts_str); | |
1963 | if (rc) | |
1964 | return rc; | |
1965 | #else | |
1966 | return -EINVAL; | |
1967 | #endif | |
1968 | } | |
1969 | ||
5df36e78 | 1970 | break; |
b72e4f42 BS |
1971 | default: |
1972 | return NFS_TEXT_DATA; | |
f7b422b1 | 1973 | } |
54ceac45 DH |
1974 | |
1975 | #ifndef CONFIG_NFS_V3 | |
8a6e5deb | 1976 | if (args->version == 3) |
5df36e78 CL |
1977 | goto out_v3_not_compiled; |
1978 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1979 | |
5df36e78 | 1980 | return 0; |
f7b422b1 | 1981 | |
5df36e78 CL |
1982 | out_no_data: |
1983 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1984 | return -EINVAL; | |
54ceac45 | 1985 | |
5df36e78 CL |
1986 | out_no_v3: |
1987 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1988 | data->version); | |
1989 | return -EINVAL; | |
f7b422b1 | 1990 | |
5df36e78 CL |
1991 | out_no_sec: |
1992 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1993 | return -EINVAL; | |
1994 | ||
5df36e78 CL |
1995 | #ifndef CONFIG_NFS_V3 |
1996 | out_v3_not_compiled: | |
1997 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1998 | return -EPROTONOSUPPORT; | |
1999 | #endif /* !CONFIG_NFS_V3 */ | |
2000 | ||
63649bd7 CG |
2001 | out_nomem: |
2002 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
2003 | return -ENOMEM; | |
2004 | ||
5df36e78 CL |
2005 | out_no_address: |
2006 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2007 | return -EINVAL; | |
2008 | ||
2009 | out_invalid_fh: | |
2010 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
2011 | return -EINVAL; | |
f7b422b1 DH |
2012 | } |
2013 | ||
d72c727c BS |
2014 | #ifdef CONFIG_NFS_V4 |
2015 | static int nfs_validate_mount_data(struct file_system_type *fs_type, | |
2016 | void *options, | |
2017 | struct nfs_parsed_mount_data *args, | |
2018 | struct nfs_fh *mntfh, | |
2019 | const char *dev_name) | |
2020 | { | |
2021 | if (fs_type == &nfs_fs_type) | |
2022 | return nfs23_validate_mount_data(options, args, mntfh, dev_name); | |
2023 | return nfs4_validate_mount_data(options, args, dev_name); | |
2024 | } | |
2025 | #else | |
2026 | static int nfs_validate_mount_data(struct file_system_type *fs_type, | |
2027 | void *options, | |
2028 | struct nfs_parsed_mount_data *args, | |
2029 | struct nfs_fh *mntfh, | |
2030 | const char *dev_name) | |
2031 | { | |
2032 | return nfs23_validate_mount_data(options, args, mntfh, dev_name); | |
2033 | } | |
2034 | #endif | |
2035 | ||
b72e4f42 BS |
2036 | static int nfs_validate_text_mount_data(void *options, |
2037 | struct nfs_parsed_mount_data *args, | |
2038 | const char *dev_name) | |
2039 | { | |
2040 | int port = 0; | |
2041 | int max_namelen = PAGE_SIZE; | |
2042 | int max_pathlen = NFS_MAXPATHLEN; | |
2043 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; | |
2044 | ||
2045 | if (nfs_parse_mount_options((char *)options, args) == 0) | |
2046 | return -EINVAL; | |
2047 | ||
2048 | if (!nfs_verify_server_address(sap)) | |
2049 | goto out_no_address; | |
2050 | ||
2051 | if (args->version == 4) { | |
2052 | #ifdef CONFIG_NFS_V4 | |
2053 | port = NFS_PORT; | |
2054 | max_namelen = NFS4_MAXNAMLEN; | |
2055 | max_pathlen = NFS4_MAXPATHLEN; | |
2056 | nfs_validate_transport_protocol(args); | |
2057 | nfs4_validate_mount_flags(args); | |
2058 | #else | |
2059 | goto out_v4_not_compiled; | |
2060 | #endif /* CONFIG_NFS_V4 */ | |
2061 | } else | |
2062 | nfs_set_mount_transport_protocol(args); | |
2063 | ||
2064 | nfs_set_port(sap, &args->nfs_server.port, port); | |
2065 | ||
2066 | if (args->auth_flavor_len > 1) | |
2067 | goto out_bad_auth; | |
2068 | ||
2069 | return nfs_parse_devname(dev_name, | |
2070 | &args->nfs_server.hostname, | |
2071 | max_namelen, | |
2072 | &args->nfs_server.export_path, | |
2073 | max_pathlen); | |
2074 | ||
2075 | #ifndef CONFIG_NFS_V4 | |
2076 | out_v4_not_compiled: | |
2077 | dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); | |
2078 | return -EPROTONOSUPPORT; | |
2079 | #endif /* !CONFIG_NFS_V4 */ | |
2080 | ||
2081 | out_no_address: | |
2082 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
2083 | return -EINVAL; | |
2084 | ||
2085 | out_bad_auth: | |
2086 | dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); | |
2087 | return -EINVAL; | |
2088 | } | |
2089 | ||
48b605f8 JL |
2090 | static int |
2091 | nfs_compare_remount_data(struct nfs_server *nfss, | |
2092 | struct nfs_parsed_mount_data *data) | |
2093 | { | |
2094 | if (data->flags != nfss->flags || | |
2095 | data->rsize != nfss->rsize || | |
2096 | data->wsize != nfss->wsize || | |
2097 | data->retrans != nfss->client->cl_timeout->to_retries || | |
2098 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
2099 | data->acregmin != nfss->acregmin / HZ || | |
2100 | data->acregmax != nfss->acregmax / HZ || | |
2101 | data->acdirmin != nfss->acdirmin / HZ || | |
2102 | data->acdirmax != nfss->acdirmax / HZ || | |
2103 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
bcd2ea17 | 2104 | data->nfs_server.port != nfss->port || |
48b605f8 | 2105 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
a1be9eee SR |
2106 | !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
2107 | (struct sockaddr *)&nfss->nfs_client->cl_addr)) | |
48b605f8 JL |
2108 | return -EINVAL; |
2109 | ||
2110 | return 0; | |
2111 | } | |
2112 | ||
2113 | static int | |
2114 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
2115 | { | |
2116 | int error; | |
2117 | struct nfs_server *nfss = sb->s_fs_info; | |
2118 | struct nfs_parsed_mount_data *data; | |
2119 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
2120 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 2121 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
2122 | |
2123 | /* | |
2124 | * Userspace mount programs that send binary options generally send | |
2125 | * them populated with default values. We have no way to know which | |
2126 | * ones were explicitly specified. Fall back to legacy behavior and | |
2127 | * just return success. | |
2128 | */ | |
31c94469 MZ |
2129 | if ((nfsvers == 4 && (!options4 || options4->version == 1)) || |
2130 | (nfsvers <= 3 && (!options || (options->version >= 1 && | |
2131 | options->version <= 6)))) | |
48b605f8 JL |
2132 | return 0; |
2133 | ||
2134 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2135 | if (data == NULL) | |
2136 | return -ENOMEM; | |
2137 | ||
2138 | /* fill out struct with values from existing mount */ | |
2139 | data->flags = nfss->flags; | |
2140 | data->rsize = nfss->rsize; | |
2141 | data->wsize = nfss->wsize; | |
2142 | data->retrans = nfss->client->cl_timeout->to_retries; | |
2143 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
2144 | data->acregmin = nfss->acregmin / HZ; | |
2145 | data->acregmax = nfss->acregmax / HZ; | |
2146 | data->acdirmin = nfss->acdirmin / HZ; | |
2147 | data->acdirmax = nfss->acdirmax / HZ; | |
2148 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
bcd2ea17 | 2149 | data->nfs_server.port = nfss->port; |
48b605f8 JL |
2150 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
2151 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
2152 | data->nfs_server.addrlen); | |
2153 | ||
2154 | /* overwrite those values with any that were specified */ | |
2155 | error = nfs_parse_mount_options((char *)options, data); | |
2156 | if (error < 0) | |
2157 | goto out; | |
2158 | ||
26c4c170 JL |
2159 | /* |
2160 | * noac is a special case. It implies -o sync, but that's not | |
2161 | * necessarily reflected in the mtab options. do_remount_sb | |
2162 | * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the | |
2163 | * remount options, so we have to explicitly reset it. | |
2164 | */ | |
2165 | if (data->flags & NFS_MOUNT_NOAC) | |
2166 | *flags |= MS_SYNCHRONOUS; | |
2167 | ||
48b605f8 JL |
2168 | /* compare new mount options with old ones */ |
2169 | error = nfs_compare_remount_data(nfss, data); | |
2170 | out: | |
2171 | kfree(data); | |
2172 | return error; | |
2173 | } | |
2174 | ||
f7b422b1 | 2175 | /* |
54ceac45 | 2176 | * Initialise the common bits of the superblock |
f7b422b1 | 2177 | */ |
54ceac45 | 2178 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 2179 | { |
54ceac45 | 2180 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2181 | |
54ceac45 | 2182 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 2183 | |
54ceac45 DH |
2184 | /* We probably want something more informative here */ |
2185 | snprintf(sb->s_id, sizeof(sb->s_id), | |
5a7c9eec | 2186 | "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
5006a76c | 2187 | |
54ceac45 DH |
2188 | if (sb->s_blocksize == 0) |
2189 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
2190 | &sb->s_blocksize_bits); | |
f7b422b1 | 2191 | |
32a88aa1 JA |
2192 | sb->s_bdi = &server->backing_dev_info; |
2193 | ||
54ceac45 | 2194 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
2195 | } |
2196 | ||
2197 | /* | |
54ceac45 | 2198 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 2199 | */ |
2283f8d6 | 2200 | static void nfs_fill_super(struct super_block *sb, |
c40f8d1d | 2201 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2202 | { |
c40f8d1d | 2203 | struct nfs_parsed_mount_data *data = mount_info->parsed; |
f7b422b1 | 2204 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 2205 | |
54ceac45 DH |
2206 | sb->s_blocksize_bits = 0; |
2207 | sb->s_blocksize = 0; | |
2208 | if (data->bsize) | |
2209 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 2210 | |
8a6e5deb | 2211 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2212 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2213 | * so ourselves when necessary. | |
2214 | */ | |
2215 | sb->s_flags |= MS_POSIXACL; | |
2216 | sb->s_time_gran = 1; | |
816724e6 | 2217 | } |
54ceac45 DH |
2218 | |
2219 | sb->s_op = &nfs_sops; | |
2220 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2221 | } |
2222 | ||
2223 | /* | |
54ceac45 | 2224 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 2225 | */ |
54ceac45 | 2226 | static void nfs_clone_super(struct super_block *sb, |
8c958e0c | 2227 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2228 | { |
8c958e0c | 2229 | const struct super_block *old_sb = mount_info->cloned->sb; |
54ceac45 DH |
2230 | struct nfs_server *server = NFS_SB(sb); |
2231 | ||
2232 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
2233 | sb->s_blocksize = old_sb->s_blocksize; | |
2234 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2235 | |
8a6e5deb | 2236 | if (server->nfs_client->rpc_ops->version == 3) { |
54ceac45 DH |
2237 | /* The VFS shouldn't apply the umask to mode bits. We will do |
2238 | * so ourselves when necessary. | |
f7b422b1 DH |
2239 | */ |
2240 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 2241 | sb->s_time_gran = 1; |
f7b422b1 DH |
2242 | } |
2243 | ||
54ceac45 DH |
2244 | sb->s_op = old_sb->s_op; |
2245 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2246 | } |
2247 | ||
275a5d24 TM |
2248 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) |
2249 | { | |
2250 | const struct nfs_server *a = s->s_fs_info; | |
2251 | const struct rpc_clnt *clnt_a = a->client; | |
2252 | const struct rpc_clnt *clnt_b = b->client; | |
2253 | ||
2254 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
2255 | goto Ebusy; | |
2256 | if (a->nfs_client != b->nfs_client) | |
2257 | goto Ebusy; | |
2258 | if (a->flags != b->flags) | |
2259 | goto Ebusy; | |
2260 | if (a->wsize != b->wsize) | |
2261 | goto Ebusy; | |
2262 | if (a->rsize != b->rsize) | |
2263 | goto Ebusy; | |
2264 | if (a->acregmin != b->acregmin) | |
2265 | goto Ebusy; | |
2266 | if (a->acregmax != b->acregmax) | |
2267 | goto Ebusy; | |
2268 | if (a->acdirmin != b->acdirmin) | |
2269 | goto Ebusy; | |
2270 | if (a->acdirmax != b->acdirmax) | |
2271 | goto Ebusy; | |
2272 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
2273 | goto Ebusy; | |
e89a5a43 | 2274 | return 1; |
275a5d24 | 2275 | Ebusy: |
e89a5a43 TM |
2276 | return 0; |
2277 | } | |
2278 | ||
2279 | struct nfs_sb_mountdata { | |
2280 | struct nfs_server *server; | |
2281 | int mntflags; | |
2282 | }; | |
2283 | ||
2284 | static int nfs_set_super(struct super_block *s, void *data) | |
2285 | { | |
2286 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2287 | struct nfs_server *server = sb_mntdata->server; | |
2288 | int ret; | |
2289 | ||
2290 | s->s_flags = sb_mntdata->mntflags; | |
2291 | s->s_fs_info = server; | |
8b244ff2 | 2292 | s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
e89a5a43 TM |
2293 | ret = set_anon_super(s, server); |
2294 | if (ret == 0) | |
2295 | server->s_dev = s->s_dev; | |
2296 | return ret; | |
2297 | } | |
2298 | ||
fd00a8ff CL |
2299 | static int nfs_compare_super_address(struct nfs_server *server1, |
2300 | struct nfs_server *server2) | |
2301 | { | |
2302 | struct sockaddr *sap1, *sap2; | |
2303 | ||
2304 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
2305 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
2306 | ||
2307 | if (sap1->sa_family != sap2->sa_family) | |
2308 | return 0; | |
2309 | ||
2310 | switch (sap1->sa_family) { | |
2311 | case AF_INET: { | |
2312 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
2313 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
2314 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
2315 | return 0; | |
2316 | if (sin1->sin_port != sin2->sin_port) | |
2317 | return 0; | |
2318 | break; | |
2319 | } | |
2320 | case AF_INET6: { | |
2321 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
2322 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
2323 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
2324 | return 0; | |
2325 | if (sin1->sin6_port != sin2->sin6_port) | |
2326 | return 0; | |
2327 | break; | |
2328 | } | |
2329 | default: | |
2330 | return 0; | |
2331 | } | |
2332 | ||
2333 | return 1; | |
2334 | } | |
2335 | ||
e89a5a43 TM |
2336 | static int nfs_compare_super(struct super_block *sb, void *data) |
2337 | { | |
2338 | struct nfs_sb_mountdata *sb_mntdata = data; | |
2339 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
2340 | int mntflags = sb_mntdata->mntflags; | |
2341 | ||
fd00a8ff | 2342 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
2343 | return 0; |
2344 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
2345 | if (old->flags & NFS_MOUNT_UNSHARED) | |
2346 | return 0; | |
2347 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
2348 | return 0; | |
2349 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
2350 | } |
2351 | ||
2311b943 BS |
2352 | static void nfs_get_cache_cookie(struct super_block *sb, |
2353 | struct nfs_parsed_mount_data *parsed, | |
2354 | struct nfs_clone_mount *cloned) | |
2355 | { | |
2356 | char *uniq = NULL; | |
2357 | int ulen = 0; | |
2358 | ||
2359 | if (parsed && parsed->fscache_uniq) { | |
2360 | uniq = parsed->fscache_uniq; | |
2361 | ulen = strlen(parsed->fscache_uniq); | |
2362 | } else if (cloned) { | |
2363 | struct nfs_server *mnt_s = NFS_SB(cloned->sb); | |
2364 | if (mnt_s->fscache_key) { | |
2365 | uniq = mnt_s->fscache_key->key.uniquifier; | |
2366 | ulen = mnt_s->fscache_key->key.uniq_len; | |
2367 | }; | |
2368 | } | |
2369 | ||
2370 | nfs_fscache_get_super_cookie(sb, uniq, ulen); | |
2371 | } | |
2372 | ||
fa799759 MS |
2373 | static int nfs_bdi_register(struct nfs_server *server) |
2374 | { | |
2375 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
2376 | } | |
2377 | ||
3d176e3f BS |
2378 | static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, |
2379 | struct nfs_mount_info *mount_info) | |
2380 | { | |
2381 | return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); | |
2382 | } | |
2383 | ||
2384 | static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, | |
2385 | struct nfs_mount_info *mount_info) | |
2386 | { | |
2387 | /* clone any lsm security options from the parent to the new sb */ | |
2388 | security_sb_clone_mnt_opts(mount_info->cloned->sb, s); | |
2389 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) | |
2390 | return -ESTALE; | |
2391 | return 0; | |
2392 | } | |
2393 | ||
c40f8d1d BS |
2394 | static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type, |
2395 | struct nfs_server *server, | |
2396 | int flags, const char *dev_name, | |
2397 | struct nfs_fh *mntfh, | |
2398 | struct nfs_mount_info *mount_info) | |
f7b422b1 | 2399 | { |
f7b422b1 | 2400 | struct super_block *s; |
01194981 | 2401 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
75180df2 | 2402 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2403 | struct nfs_sb_mountdata sb_mntdata = { |
2404 | .mntflags = flags, | |
c40f8d1d | 2405 | .server = server, |
e89a5a43 | 2406 | }; |
01194981 | 2407 | int error; |
33852a1f | 2408 | |
75180df2 TM |
2409 | if (server->flags & NFS_MOUNT_UNSHARED) |
2410 | compare_super = NULL; | |
2411 | ||
fb2088cc SP |
2412 | /* -o noac implies -o sync */ |
2413 | if (server->flags & NFS_MOUNT_NOAC) | |
2414 | sb_mntdata.mntflags |= MS_SYNCHRONOUS; | |
2415 | ||
54ceac45 | 2416 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2417 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 | 2418 | if (IS_ERR(s)) { |
01194981 | 2419 | mntroot = ERR_CAST(s); |
54ceac45 | 2420 | goto out_err_nosb; |
816724e6 TM |
2421 | } |
2422 | ||
54ceac45 DH |
2423 | if (s->s_fs_info != server) { |
2424 | nfs_free_server(server); | |
2425 | server = NULL; | |
fa799759 MS |
2426 | } else { |
2427 | error = nfs_bdi_register(server); | |
01194981 AV |
2428 | if (error) { |
2429 | mntroot = ERR_PTR(error); | |
cfbc0683 | 2430 | goto error_splat_bdi; |
01194981 | 2431 | } |
54ceac45 | 2432 | } |
f7b422b1 | 2433 | |
54ceac45 DH |
2434 | if (!s->s_root) { |
2435 | /* initial superblock/root creation */ | |
c40f8d1d | 2436 | mount_info->fill_super(s, mount_info); |
3d176e3f | 2437 | nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); |
54ceac45 | 2438 | } |
f7b422b1 | 2439 | |
0d5839ad | 2440 | mntroot = nfs_get_root(s, mntfh, dev_name); |
01194981 | 2441 | if (IS_ERR(mntroot)) |
54ceac45 | 2442 | goto error_splat_super; |
816724e6 | 2443 | |
3d176e3f | 2444 | error = mount_info->set_security(s, mntroot, mount_info); |
f9c3a380 EP |
2445 | if (error) |
2446 | goto error_splat_root; | |
2447 | ||
54ceac45 | 2448 | s->s_flags |= MS_ACTIVE; |
0655960f CL |
2449 | |
2450 | out: | |
01194981 | 2451 | return mntroot; |
816724e6 | 2452 | |
54ceac45 DH |
2453 | out_err_nosb: |
2454 | nfs_free_server(server); | |
0655960f | 2455 | goto out; |
54ceac45 | 2456 | |
f9c3a380 EP |
2457 | error_splat_root: |
2458 | dput(mntroot); | |
01194981 | 2459 | mntroot = ERR_PTR(error); |
54ceac45 | 2460 | error_splat_super: |
cfbc0683 N |
2461 | if (server && !s->s_root) |
2462 | bdi_unregister(&server->backing_dev_info); | |
2463 | error_splat_bdi: | |
6f5bbff9 | 2464 | deactivate_locked_super(s); |
0655960f | 2465 | goto out; |
f7b422b1 DH |
2466 | } |
2467 | ||
c40f8d1d BS |
2468 | static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, |
2469 | int flags, const char *dev_name, void *raw_data) | |
2470 | { | |
c40f8d1d BS |
2471 | struct nfs_parsed_mount_data *data = NULL; |
2472 | struct nfs_mount_info mount_info = { | |
2473 | .fill_super = nfs_fill_super, | |
3d176e3f | 2474 | .set_security = nfs_set_sb_security, |
c40f8d1d BS |
2475 | }; |
2476 | struct nfs_fh *mntfh; | |
2477 | struct dentry *mntroot = ERR_PTR(-ENOMEM); | |
2478 | int error; | |
2479 | ||
db833351 | 2480 | data = nfs_alloc_parsed_mount_data(); |
c40f8d1d BS |
2481 | mntfh = nfs_alloc_fhandle(); |
2482 | if (data == NULL || mntfh == NULL) | |
2483 | goto out; | |
2484 | ||
2485 | /* Validate the mount data */ | |
d72c727c | 2486 | error = nfs_validate_mount_data(fs_type, raw_data, data, mntfh, dev_name); |
b72e4f42 BS |
2487 | if (error == NFS_TEXT_DATA) |
2488 | error = nfs_validate_text_mount_data(raw_data, data, dev_name); | |
c40f8d1d BS |
2489 | if (error < 0) { |
2490 | mntroot = ERR_PTR(error); | |
2491 | goto out; | |
2492 | } | |
2493 | mount_info.parsed = data; | |
2494 | ||
2495 | #ifdef CONFIG_NFS_V4 | |
486aa699 | 2496 | if (data->version == 4) |
c40f8d1d | 2497 | mntroot = nfs4_try_mount(flags, dev_name, data); |
486aa699 | 2498 | else |
c40f8d1d | 2499 | #endif /* CONFIG_NFS_V4 */ |
486aa699 | 2500 | mntroot = nfs_try_mount(flags, dev_name, mntfh, &mount_info); |
c40f8d1d | 2501 | |
c40f8d1d BS |
2502 | out: |
2503 | nfs_free_parsed_mount_data(data); | |
2504 | nfs_free_fhandle(mntfh); | |
2505 | return mntroot; | |
2506 | } | |
2507 | ||
387c149b TM |
2508 | /* |
2509 | * Ensure that we unregister the bdi before kill_anon_super | |
2510 | * releases the device name | |
2511 | */ | |
2512 | static void nfs_put_super(struct super_block *s) | |
2513 | { | |
2514 | struct nfs_server *server = NFS_SB(s); | |
2515 | ||
2516 | bdi_unregister(&server->backing_dev_info); | |
2517 | } | |
2518 | ||
54ceac45 DH |
2519 | /* |
2520 | * Destroy an NFS2/3 superblock | |
2521 | */ | |
f7b422b1 DH |
2522 | static void nfs_kill_super(struct super_block *s) |
2523 | { | |
2524 | struct nfs_server *server = NFS_SB(s); | |
2525 | ||
2526 | kill_anon_super(s); | |
08734048 | 2527 | nfs_fscache_release_super_cookie(s); |
54ceac45 | 2528 | nfs_free_server(server); |
f7b422b1 DH |
2529 | } |
2530 | ||
54ceac45 | 2531 | /* |
8c958e0c | 2532 | * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) |
54ceac45 | 2533 | */ |
31f43471 | 2534 | static struct dentry * |
8c958e0c BS |
2535 | nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, |
2536 | const char *dev_name, struct nfs_mount_info *mount_info) | |
f7b422b1 | 2537 | { |
8c958e0c | 2538 | struct nfs_clone_mount *data = mount_info->cloned; |
54ceac45 | 2539 | struct nfs_server *server; |
3d176e3f | 2540 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
54ceac45 | 2541 | int error; |
f7b422b1 | 2542 | |
8c958e0c | 2543 | dprintk("--> nfs_xdev_mount_common()\n"); |
f7b422b1 | 2544 | |
54ceac45 | 2545 | /* create a new volume representation */ |
7e6eb683 | 2546 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); |
54ceac45 DH |
2547 | if (IS_ERR(server)) { |
2548 | error = PTR_ERR(server); | |
3d176e3f | 2549 | goto out_err; |
4c1fe2f7 | 2550 | } |
f7b422b1 | 2551 | |
3d176e3f | 2552 | mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info); |
8c958e0c | 2553 | dprintk("<-- nfs_xdev_mount_common() = 0\n"); |
3d176e3f | 2554 | out: |
31f43471 | 2555 | return mntroot; |
24c8dbbb | 2556 | |
3d176e3f | 2557 | out_err: |
8c958e0c | 2558 | dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); |
3d176e3f | 2559 | goto out; |
f7b422b1 DH |
2560 | } |
2561 | ||
8c958e0c BS |
2562 | /* |
2563 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2564 | */ | |
2565 | static struct dentry * | |
2566 | nfs_xdev_mount(struct file_system_type *fs_type, int flags, | |
2567 | const char *dev_name, void *raw_data) | |
2568 | { | |
2569 | struct nfs_mount_info mount_info = { | |
2570 | .fill_super = nfs_clone_super, | |
3d176e3f | 2571 | .set_security = nfs_clone_sb_security, |
8c958e0c BS |
2572 | .cloned = raw_data, |
2573 | }; | |
2574 | return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info); | |
2575 | } | |
2576 | ||
54ceac45 DH |
2577 | #ifdef CONFIG_NFS_V4 |
2578 | ||
f7b422b1 | 2579 | /* |
54ceac45 | 2580 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2581 | */ |
54ceac45 | 2582 | static void nfs4_clone_super(struct super_block *sb, |
8c958e0c | 2583 | struct nfs_mount_info *mount_info) |
f7b422b1 | 2584 | { |
8c958e0c | 2585 | const struct super_block *old_sb = mount_info->cloned->sb; |
54ceac45 DH |
2586 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2587 | sb->s_blocksize = old_sb->s_blocksize; | |
2588 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2589 | sb->s_time_gran = 1; |
54ceac45 | 2590 | sb->s_op = old_sb->s_op; |
a8a5da99 AK |
2591 | /* |
2592 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2593 | * so ourselves when necessary. | |
2594 | */ | |
2595 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b AK |
2596 | sb->s_xattr = old_sb->s_xattr; |
2597 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2598 | } |
2599 | ||
54ceac45 DH |
2600 | /* |
2601 | * Set up an NFS4 superblock | |
2602 | */ | |
c40f8d1d BS |
2603 | static void nfs4_fill_super(struct super_block *sb, |
2604 | struct nfs_mount_info *mount_info) | |
f7b422b1 | 2605 | { |
54ceac45 DH |
2606 | sb->s_time_gran = 1; |
2607 | sb->s_op = &nfs4_sops; | |
a8a5da99 AK |
2608 | /* |
2609 | * The VFS shouldn't apply the umask to mode bits. We will do | |
2610 | * so ourselves when necessary. | |
2611 | */ | |
2612 | sb->s_flags |= MS_POSIXACL; | |
64c2ce8b | 2613 | sb->s_xattr = nfs4_xattr_handlers; |
54ceac45 | 2614 | nfs_initialise_sb(sb); |
f7b422b1 DH |
2615 | } |
2616 | ||
01c3f052 TM |
2617 | static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
2618 | { | |
5eebde23 SJ |
2619 | args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
2620 | NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); | |
01c3f052 TM |
2621 | } |
2622 | ||
f0768ebd CL |
2623 | /* |
2624 | * Validate NFSv4 mount options | |
2625 | */ | |
91ea40b9 TT |
2626 | static int nfs4_validate_mount_data(void *options, |
2627 | struct nfs_parsed_mount_data *args, | |
2628 | const char *dev_name) | |
f0768ebd | 2629 | { |
4cfd74fc | 2630 | struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
91ea40b9 | 2631 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2632 | char *c; |
2633 | ||
2634 | if (data == NULL) | |
2635 | goto out_no_data; | |
2636 | ||
2637 | switch (data->version) { | |
2638 | case 1: | |
4c568017 CL |
2639 | if (data->host_addrlen > sizeof(args->nfs_server.address)) |
2640 | goto out_no_address; | |
2641 | if (data->host_addrlen == 0) | |
f0768ebd | 2642 | goto out_no_address; |
4c568017 | 2643 | args->nfs_server.addrlen = data->host_addrlen; |
4cfd74fc | 2644 | if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
f0768ebd | 2645 | return -EFAULT; |
4cfd74fc | 2646 | if (!nfs_verify_server_address(sap)) |
f0768ebd CL |
2647 | goto out_no_address; |
2648 | ||
6738b251 CL |
2649 | if (data->auth_flavourlen) { |
2650 | if (data->auth_flavourlen > 1) | |
2651 | goto out_inval_auth; | |
20c71f5e | 2652 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2653 | data->auth_flavours, |
20c71f5e | 2654 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2655 | return -EFAULT; |
f0768ebd CL |
2656 | } |
2657 | ||
2658 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2659 | if (IS_ERR(c)) | |
2660 | return PTR_ERR(c); | |
91ea40b9 | 2661 | args->nfs_server.hostname = c; |
f0768ebd CL |
2662 | |
2663 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2664 | if (IS_ERR(c)) | |
2665 | return PTR_ERR(c); | |
91ea40b9 TT |
2666 | args->nfs_server.export_path = c; |
2667 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2668 | |
2669 | c = strndup_user(data->client_addr.data, 16); | |
2670 | if (IS_ERR(c)) | |
2671 | return PTR_ERR(c); | |
91ea40b9 TT |
2672 | args->client_address = c; |
2673 | ||
2674 | /* | |
2675 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2676 | * can deal with. | |
2677 | */ | |
2678 | ||
2679 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2680 | args->rsize = data->rsize; | |
2681 | args->wsize = data->wsize; | |
2682 | args->timeo = data->timeo; | |
2683 | args->retrans = data->retrans; | |
2684 | args->acregmin = data->acregmin; | |
2685 | args->acregmax = data->acregmax; | |
2686 | args->acdirmin = data->acdirmin; | |
2687 | args->acdirmax = data->acdirmax; | |
2688 | args->nfs_server.protocol = data->proto; | |
259875ef | 2689 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2690 | |
2691 | break; | |
7630c852 | 2692 | default: |
b72e4f42 | 2693 | return NFS_TEXT_DATA; |
f0768ebd CL |
2694 | } |
2695 | ||
2696 | return 0; | |
2697 | ||
2698 | out_no_data: | |
2699 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2700 | return -EINVAL; | |
2701 | ||
2702 | out_inval_auth: | |
2703 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2704 | data->auth_flavourlen); | |
2705 | return -EINVAL; | |
2706 | ||
2707 | out_no_address: | |
2708 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2709 | return -EINVAL; | |
f0768ebd CL |
2710 | } |
2711 | ||
54ceac45 | 2712 | /* |
c02d7adf | 2713 | * Get the superblock for the NFS4 root partition |
54ceac45 | 2714 | */ |
31f43471 AV |
2715 | static struct dentry * |
2716 | nfs4_remote_mount(struct file_system_type *fs_type, int flags, | |
2717 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2718 | { |
c40f8d1d BS |
2719 | struct nfs_mount_info mount_info = { |
2720 | .fill_super = nfs4_fill_super, | |
3d176e3f | 2721 | .set_security = nfs_set_sb_security, |
c40f8d1d BS |
2722 | .parsed = raw_data, |
2723 | }; | |
54ceac45 | 2724 | struct nfs_server *server; |
33852a1f | 2725 | struct nfs_fh *mntfh; |
c40f8d1d | 2726 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
33852a1f | 2727 | |
b157b06c | 2728 | mntfh = nfs_alloc_fhandle(); |
c40f8d1d | 2729 | if (mount_info.parsed == NULL || mntfh == NULL) |
8a0d551a | 2730 | goto out; |
f9c3a380 | 2731 | |
54ceac45 | 2732 | /* Get a volume representation */ |
c40f8d1d | 2733 | server = nfs4_create_server(mount_info.parsed, mntfh); |
54ceac45 | 2734 | if (IS_ERR(server)) { |
c40f8d1d | 2735 | mntroot = ERR_CAST(server); |
29eb981a | 2736 | goto out; |
f7b422b1 DH |
2737 | } |
2738 | ||
c40f8d1d BS |
2739 | mntroot = nfs_fs_mount_common(fs_type, server, flags, |
2740 | dev_name, mntfh, &mount_info); | |
29eb981a CL |
2741 | |
2742 | out: | |
b157b06c | 2743 | nfs_free_fhandle(mntfh); |
c40f8d1d | 2744 | return mntroot; |
f7b422b1 DH |
2745 | } |
2746 | ||
c02d7adf TM |
2747 | static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
2748 | int flags, void *data, const char *hostname) | |
2749 | { | |
2750 | struct vfsmount *root_mnt; | |
2751 | char *root_devname; | |
2752 | size_t len; | |
2753 | ||
98a2139f | 2754 | len = strlen(hostname) + 5; |
c02d7adf TM |
2755 | root_devname = kmalloc(len, GFP_KERNEL); |
2756 | if (root_devname == NULL) | |
2757 | return ERR_PTR(-ENOMEM); | |
98a2139f JK |
2758 | /* Does hostname needs to be enclosed in brackets? */ |
2759 | if (strchr(hostname, ':')) | |
2760 | snprintf(root_devname, len, "[%s]:/", hostname); | |
2761 | else | |
2762 | snprintf(root_devname, len, "%s:/", hostname); | |
c02d7adf TM |
2763 | root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); |
2764 | kfree(root_devname); | |
2765 | return root_mnt; | |
2766 | } | |
2767 | ||
ce587e07 TM |
2768 | struct nfs_referral_count { |
2769 | struct list_head list; | |
2770 | const struct task_struct *task; | |
2771 | unsigned int referral_count; | |
2772 | }; | |
2773 | ||
2774 | static LIST_HEAD(nfs_referral_count_list); | |
2775 | static DEFINE_SPINLOCK(nfs_referral_count_list_lock); | |
2776 | ||
2777 | static struct nfs_referral_count *nfs_find_referral_count(void) | |
2778 | { | |
2779 | struct nfs_referral_count *p; | |
2780 | ||
2781 | list_for_each_entry(p, &nfs_referral_count_list, list) { | |
2782 | if (p->task == current) | |
2783 | return p; | |
2784 | } | |
2785 | return NULL; | |
2786 | } | |
2787 | ||
2788 | #define NFS_MAX_NESTED_REFERRALS 2 | |
2789 | ||
2790 | static int nfs_referral_loop_protect(void) | |
2791 | { | |
2792 | struct nfs_referral_count *p, *new; | |
2793 | int ret = -ENOMEM; | |
2794 | ||
2795 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2796 | if (!new) | |
2797 | goto out; | |
2798 | new->task = current; | |
2799 | new->referral_count = 1; | |
2800 | ||
2801 | ret = 0; | |
2802 | spin_lock(&nfs_referral_count_list_lock); | |
2803 | p = nfs_find_referral_count(); | |
2804 | if (p != NULL) { | |
2805 | if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) | |
2806 | ret = -ELOOP; | |
2807 | else | |
2808 | p->referral_count++; | |
2809 | } else { | |
2810 | list_add(&new->list, &nfs_referral_count_list); | |
2811 | new = NULL; | |
2812 | } | |
2813 | spin_unlock(&nfs_referral_count_list_lock); | |
2814 | kfree(new); | |
2815 | out: | |
2816 | return ret; | |
2817 | } | |
2818 | ||
2819 | static void nfs_referral_loop_unprotect(void) | |
2820 | { | |
2821 | struct nfs_referral_count *p; | |
2822 | ||
2823 | spin_lock(&nfs_referral_count_list_lock); | |
2824 | p = nfs_find_referral_count(); | |
2825 | p->referral_count--; | |
2826 | if (p->referral_count == 0) | |
2827 | list_del(&p->list); | |
2828 | else | |
2829 | p = NULL; | |
2830 | spin_unlock(&nfs_referral_count_list_lock); | |
2831 | kfree(p); | |
2832 | } | |
2833 | ||
01194981 AV |
2834 | static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, |
2835 | const char *export_path) | |
c02d7adf | 2836 | { |
01194981 | 2837 | struct dentry *dentry; |
5352d3b6 | 2838 | int err; |
c02d7adf | 2839 | |
5352d3b6 AV |
2840 | if (IS_ERR(root_mnt)) |
2841 | return ERR_CAST(root_mnt); | |
2842 | ||
2843 | err = nfs_referral_loop_protect(); | |
2844 | if (err) { | |
ea441d11 | 2845 | mntput(root_mnt); |
5352d3b6 | 2846 | return ERR_PTR(err); |
ea441d11 | 2847 | } |
c02d7adf | 2848 | |
ea441d11 AV |
2849 | dentry = mount_subtree(root_mnt, export_path); |
2850 | nfs_referral_loop_unprotect(); | |
c02d7adf | 2851 | |
01194981 | 2852 | return dentry; |
c02d7adf TM |
2853 | } |
2854 | ||
01194981 AV |
2855 | static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
2856 | struct nfs_parsed_mount_data *data) | |
a6fe23be CL |
2857 | { |
2858 | char *export_path; | |
2859 | struct vfsmount *root_mnt; | |
01194981 | 2860 | struct dentry *res; |
a6fe23be CL |
2861 | |
2862 | dfprintk(MOUNT, "--> nfs4_try_mount()\n"); | |
2863 | ||
2864 | export_path = data->nfs_server.export_path; | |
2865 | data->nfs_server.export_path = "/"; | |
2866 | root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, | |
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 | ||
c02d7adf TM |
2878 | /* |
2879 | * Get the superblock for an NFS4 mountpoint | |
2880 | */ | |
01194981 AV |
2881 | static struct dentry *nfs4_mount(struct file_system_type *fs_type, |
2882 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
2883 | { |
2884 | struct nfs_parsed_mount_data *data; | |
c02d7adf | 2885 | int error = -ENOMEM; |
01194981 | 2886 | struct dentry *res = ERR_PTR(-ENOMEM); |
c02d7adf | 2887 | |
db833351 | 2888 | data = nfs_alloc_parsed_mount_data(); |
c02d7adf | 2889 | if (data == NULL) |
8a0d551a | 2890 | goto out; |
c02d7adf TM |
2891 | |
2892 | /* Validate the mount data */ | |
d72c727c | 2893 | error = nfs_validate_mount_data(fs_type, raw_data, data, NULL, dev_name); |
b72e4f42 BS |
2894 | if (error == NFS_TEXT_DATA) |
2895 | error = nfs_validate_text_mount_data(raw_data, data, dev_name); | |
01194981 AV |
2896 | if (error < 0) { |
2897 | res = ERR_PTR(error); | |
c02d7adf | 2898 | goto out; |
01194981 | 2899 | } |
c02d7adf | 2900 | |
01194981 AV |
2901 | res = nfs4_try_mount(flags, dev_name, data); |
2902 | if (IS_ERR(res)) | |
2903 | error = PTR_ERR(res); | |
c02d7adf TM |
2904 | |
2905 | out: | |
8a0d551a | 2906 | nfs_free_parsed_mount_data(data); |
01194981 | 2907 | dprintk("<-- nfs4_mount() = %d%s\n", error, |
c02d7adf | 2908 | error != 0 ? " [error]" : ""); |
01194981 | 2909 | return res; |
c02d7adf TM |
2910 | } |
2911 | ||
f7b422b1 DH |
2912 | static void nfs4_kill_super(struct super_block *sb) |
2913 | { | |
2914 | struct nfs_server *server = NFS_SB(sb); | |
2915 | ||
0f3e66c6 | 2916 | dprintk("--> %s\n", __func__); |
515d8611 | 2917 | nfs_super_return_all_delegations(sb); |
f7b422b1 | 2918 | kill_anon_super(sb); |
08734048 | 2919 | nfs_fscache_release_super_cookie(sb); |
54ceac45 | 2920 | nfs_free_server(server); |
0f3e66c6 | 2921 | dprintk("<-- %s\n", __func__); |
f7b422b1 DH |
2922 | } |
2923 | ||
2924 | /* | |
54ceac45 | 2925 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2926 | */ |
31f43471 AV |
2927 | static struct dentry * |
2928 | nfs4_xdev_mount(struct file_system_type *fs_type, int flags, | |
2929 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2930 | { |
8c958e0c BS |
2931 | struct nfs_mount_info mount_info = { |
2932 | .fill_super = nfs4_clone_super, | |
3d176e3f | 2933 | .set_security = nfs_clone_sb_security, |
8c958e0c | 2934 | .cloned = raw_data, |
e89a5a43 | 2935 | }; |
8c958e0c | 2936 | return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info); |
f7b422b1 DH |
2937 | } |
2938 | ||
31f43471 AV |
2939 | static struct dentry * |
2940 | nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, | |
2941 | const char *dev_name, void *raw_data) | |
f7b422b1 | 2942 | { |
21e4b82e BS |
2943 | struct nfs_mount_info mount_info = { |
2944 | .fill_super = nfs4_fill_super, | |
2945 | .set_security = nfs_clone_sb_security, | |
2946 | .cloned = raw_data, | |
2947 | }; | |
54ceac45 | 2948 | struct nfs_server *server; |
21e4b82e | 2949 | struct dentry *mntroot = ERR_PTR(-ENOMEM); |
4f727296 | 2950 | struct nfs_fh *mntfh; |
54ceac45 DH |
2951 | |
2952 | dprintk("--> nfs4_referral_get_sb()\n"); | |
2953 | ||
4f727296 | 2954 | mntfh = nfs_alloc_fhandle(); |
21e4b82e BS |
2955 | if (mount_info.cloned == NULL || mntfh == NULL) |
2956 | goto out; | |
4f727296 | 2957 | |
54ceac45 | 2958 | /* create a new volume representation */ |
21e4b82e | 2959 | server = nfs4_create_referral_server(mount_info.cloned, mntfh); |
54ceac45 | 2960 | if (IS_ERR(server)) { |
21e4b82e BS |
2961 | mntroot = ERR_CAST(server); |
2962 | goto out; | |
e9cc6c23 | 2963 | } |
54ceac45 | 2964 | |
21e4b82e BS |
2965 | mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info); |
2966 | out: | |
4f727296 | 2967 | nfs_free_fhandle(mntfh); |
31f43471 | 2968 | return mntroot; |
f7b422b1 DH |
2969 | } |
2970 | ||
c02d7adf TM |
2971 | /* |
2972 | * Create an NFS4 server record on referral traversal | |
2973 | */ | |
01194981 AV |
2974 | static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
2975 | int flags, const char *dev_name, void *raw_data) | |
c02d7adf TM |
2976 | { |
2977 | struct nfs_clone_mount *data = raw_data; | |
2978 | char *export_path; | |
2979 | struct vfsmount *root_mnt; | |
01194981 | 2980 | struct dentry *res; |
c02d7adf | 2981 | |
01194981 | 2982 | dprintk("--> nfs4_referral_mount()\n"); |
c02d7adf TM |
2983 | |
2984 | export_path = data->mnt_path; | |
2985 | data->mnt_path = "/"; | |
2986 | ||
2987 | root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, | |
2988 | flags, data, data->hostname); | |
2989 | data->mnt_path = export_path; | |
2990 | ||
5352d3b6 | 2991 | res = nfs_follow_remote_path(root_mnt, export_path); |
01194981 AV |
2992 | dprintk("<-- nfs4_referral_mount() = %ld%s\n", |
2993 | IS_ERR(res) ? PTR_ERR(res) : 0, | |
2994 | IS_ERR(res) ? " [error]" : ""); | |
2995 | return res; | |
c02d7adf TM |
2996 | } |
2997 | ||
54ceac45 | 2998 | #endif /* CONFIG_NFS_V4 */ |