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Commit | Line | Data |
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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
8 | * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some | |
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> | |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/seq_file.h> | |
44 | #include <linux/mount.h> | |
45 | #include <linux/nfs_idmap.h> | |
46 | #include <linux/vfs.h> | |
47 | #include <linux/inet.h> | |
fd00a8ff CL |
48 | #include <linux/in6.h> |
49 | #include <net/ipv6.h> | |
d8e7748a | 50 | #include <linux/netdevice.h> |
f7b422b1 | 51 | #include <linux/nfs_xdr.h> |
b5d5dfbd | 52 | #include <linux/magic.h> |
bf0fd768 | 53 | #include <linux/parser.h> |
f7b422b1 DH |
54 | |
55 | #include <asm/system.h> | |
56 | #include <asm/uaccess.h> | |
57 | ||
58 | #include "nfs4_fs.h" | |
59 | #include "callback.h" | |
60 | #include "delegation.h" | |
61 | #include "iostat.h" | |
62 | #include "internal.h" | |
63 | ||
64 | #define NFSDBG_FACILITY NFSDBG_VFS | |
65 | ||
bf0fd768 CL |
66 | enum { |
67 | /* Mount options that take no arguments */ | |
68 | Opt_soft, Opt_hard, | |
bf0fd768 CL |
69 | Opt_posix, Opt_noposix, |
70 | Opt_cto, Opt_nocto, | |
71 | Opt_ac, Opt_noac, | |
72 | Opt_lock, Opt_nolock, | |
73 | Opt_v2, Opt_v3, | |
2cf7ff7a | 74 | Opt_udp, Opt_tcp, Opt_rdma, |
bf0fd768 CL |
75 | Opt_acl, Opt_noacl, |
76 | Opt_rdirplus, Opt_nordirplus, | |
75180df2 | 77 | Opt_sharecache, Opt_nosharecache, |
bf0fd768 CL |
78 | |
79 | /* Mount options that take integer arguments */ | |
80 | Opt_port, | |
81 | Opt_rsize, Opt_wsize, Opt_bsize, | |
82 | Opt_timeo, Opt_retrans, | |
83 | Opt_acregmin, Opt_acregmax, | |
84 | Opt_acdirmin, Opt_acdirmax, | |
85 | Opt_actimeo, | |
86 | Opt_namelen, | |
87 | Opt_mountport, | |
e887cbcf | 88 | Opt_mountvers, |
ad879cef | 89 | Opt_nfsvers, |
bf0fd768 CL |
90 | |
91 | /* Mount options that take string arguments */ | |
33832034 | 92 | Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, |
0ac83779 | 93 | Opt_addr, Opt_mountaddr, Opt_clientaddr, |
bf0fd768 | 94 | |
f45663ce CL |
95 | /* Special mount options */ |
96 | Opt_userspace, Opt_deprecated, Opt_sloppy, | |
bf0fd768 CL |
97 | |
98 | Opt_err | |
99 | }; | |
100 | ||
101 | static match_table_t nfs_mount_option_tokens = { | |
102 | { Opt_userspace, "bg" }, | |
103 | { Opt_userspace, "fg" }, | |
ecbb3845 CL |
104 | { Opt_userspace, "retry=%s" }, |
105 | ||
f45663ce CL |
106 | { Opt_sloppy, "sloppy" }, |
107 | ||
bf0fd768 CL |
108 | { Opt_soft, "soft" }, |
109 | { Opt_hard, "hard" }, | |
d33e4dfe CL |
110 | { Opt_deprecated, "intr" }, |
111 | { Opt_deprecated, "nointr" }, | |
bf0fd768 CL |
112 | { Opt_posix, "posix" }, |
113 | { Opt_noposix, "noposix" }, | |
114 | { Opt_cto, "cto" }, | |
115 | { Opt_nocto, "nocto" }, | |
116 | { Opt_ac, "ac" }, | |
117 | { Opt_noac, "noac" }, | |
118 | { Opt_lock, "lock" }, | |
119 | { Opt_nolock, "nolock" }, | |
120 | { Opt_v2, "v2" }, | |
121 | { Opt_v3, "v3" }, | |
122 | { Opt_udp, "udp" }, | |
123 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 124 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
125 | { Opt_acl, "acl" }, |
126 | { Opt_noacl, "noacl" }, | |
127 | { Opt_rdirplus, "rdirplus" }, | |
128 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
129 | { Opt_sharecache, "sharecache" }, |
130 | { Opt_nosharecache, "nosharecache" }, | |
bf0fd768 CL |
131 | |
132 | { Opt_port, "port=%u" }, | |
133 | { Opt_rsize, "rsize=%u" }, | |
134 | { Opt_wsize, "wsize=%u" }, | |
135 | { Opt_bsize, "bsize=%u" }, | |
136 | { Opt_timeo, "timeo=%u" }, | |
137 | { Opt_retrans, "retrans=%u" }, | |
138 | { Opt_acregmin, "acregmin=%u" }, | |
139 | { Opt_acregmax, "acregmax=%u" }, | |
140 | { Opt_acdirmin, "acdirmin=%u" }, | |
141 | { Opt_acdirmax, "acdirmax=%u" }, | |
142 | { Opt_actimeo, "actimeo=%u" }, | |
bf0fd768 CL |
143 | { Opt_namelen, "namlen=%u" }, |
144 | { Opt_mountport, "mountport=%u" }, | |
bf0fd768 | 145 | { Opt_mountvers, "mountvers=%u" }, |
bf0fd768 CL |
146 | { Opt_nfsvers, "nfsvers=%u" }, |
147 | { Opt_nfsvers, "vers=%u" }, | |
148 | ||
149 | { Opt_sec, "sec=%s" }, | |
150 | { Opt_proto, "proto=%s" }, | |
151 | { Opt_mountproto, "mountproto=%s" }, | |
152 | { Opt_addr, "addr=%s" }, | |
153 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 154 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 155 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 CL |
156 | |
157 | { Opt_err, NULL } | |
158 | }; | |
159 | ||
160 | enum { | |
2cf7ff7a | 161 | Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, |
bf0fd768 CL |
162 | |
163 | Opt_xprt_err | |
164 | }; | |
165 | ||
166 | static match_table_t nfs_xprt_protocol_tokens = { | |
167 | { Opt_xprt_udp, "udp" }, | |
168 | { Opt_xprt_tcp, "tcp" }, | |
2cf7ff7a | 169 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
170 | |
171 | { Opt_xprt_err, NULL } | |
172 | }; | |
173 | ||
174 | enum { | |
175 | Opt_sec_none, Opt_sec_sys, | |
176 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
177 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
178 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
179 | ||
180 | Opt_sec_err | |
181 | }; | |
182 | ||
183 | static match_table_t nfs_secflavor_tokens = { | |
184 | { Opt_sec_none, "none" }, | |
185 | { Opt_sec_none, "null" }, | |
186 | { Opt_sec_sys, "sys" }, | |
187 | ||
188 | { Opt_sec_krb5, "krb5" }, | |
189 | { Opt_sec_krb5i, "krb5i" }, | |
190 | { Opt_sec_krb5p, "krb5p" }, | |
191 | ||
192 | { Opt_sec_lkey, "lkey" }, | |
193 | { Opt_sec_lkeyi, "lkeyi" }, | |
194 | { Opt_sec_lkeyp, "lkeyp" }, | |
195 | ||
8d042218 OK |
196 | { Opt_sec_spkm, "spkm3" }, |
197 | { Opt_sec_spkmi, "spkm3i" }, | |
198 | { Opt_sec_spkmp, "spkm3p" }, | |
199 | ||
bf0fd768 CL |
200 | { Opt_sec_err, NULL } |
201 | }; | |
202 | ||
203 | ||
42faad99 | 204 | static void nfs_umount_begin(struct super_block *); |
816724e6 | 205 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 DH |
206 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
207 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
816724e6 | 208 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); |
54ceac45 | 209 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, |
816724e6 | 210 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); |
f7b422b1 | 211 | static void nfs_kill_super(struct super_block *); |
ef818a28 | 212 | static void nfs_put_super(struct super_block *); |
48b605f8 | 213 | static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); |
f7b422b1 DH |
214 | |
215 | static struct file_system_type nfs_fs_type = { | |
216 | .owner = THIS_MODULE, | |
217 | .name = "nfs", | |
218 | .get_sb = nfs_get_sb, | |
219 | .kill_sb = nfs_kill_super, | |
349457cc | 220 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
221 | }; |
222 | ||
54ceac45 | 223 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
224 | .owner = THIS_MODULE, |
225 | .name = "nfs", | |
54ceac45 | 226 | .get_sb = nfs_xdev_get_sb, |
f7b422b1 | 227 | .kill_sb = nfs_kill_super, |
349457cc | 228 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
229 | }; |
230 | ||
ee9b6d61 | 231 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
232 | .alloc_inode = nfs_alloc_inode, |
233 | .destroy_inode = nfs_destroy_inode, | |
234 | .write_inode = nfs_write_inode, | |
ef818a28 | 235 | .put_super = nfs_put_super, |
f7b422b1 DH |
236 | .statfs = nfs_statfs, |
237 | .clear_inode = nfs_clear_inode, | |
238 | .umount_begin = nfs_umount_begin, | |
239 | .show_options = nfs_show_options, | |
240 | .show_stats = nfs_show_stats, | |
48b605f8 | 241 | .remount_fs = nfs_remount, |
f7b422b1 DH |
242 | }; |
243 | ||
244 | #ifdef CONFIG_NFS_V4 | |
816724e6 TM |
245 | static int nfs4_get_sb(struct file_system_type *fs_type, |
246 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
54ceac45 DH |
247 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, |
248 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
249 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, | |
250 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
f7b422b1 DH |
251 | static void nfs4_kill_super(struct super_block *sb); |
252 | ||
253 | static struct file_system_type nfs4_fs_type = { | |
254 | .owner = THIS_MODULE, | |
255 | .name = "nfs4", | |
256 | .get_sb = nfs4_get_sb, | |
257 | .kill_sb = nfs4_kill_super, | |
349457cc | 258 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
259 | }; |
260 | ||
54ceac45 | 261 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
262 | .owner = THIS_MODULE, |
263 | .name = "nfs4", | |
54ceac45 | 264 | .get_sb = nfs4_xdev_get_sb, |
f7b422b1 | 265 | .kill_sb = nfs4_kill_super, |
349457cc | 266 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
267 | }; |
268 | ||
54ceac45 | 269 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
270 | .owner = THIS_MODULE, |
271 | .name = "nfs4", | |
54ceac45 | 272 | .get_sb = nfs4_referral_get_sb, |
f7b422b1 | 273 | .kill_sb = nfs4_kill_super, |
349457cc | 274 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
275 | }; |
276 | ||
ee9b6d61 | 277 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
278 | .alloc_inode = nfs_alloc_inode, |
279 | .destroy_inode = nfs_destroy_inode, | |
280 | .write_inode = nfs_write_inode, | |
281 | .statfs = nfs_statfs, | |
282 | .clear_inode = nfs4_clear_inode, | |
283 | .umount_begin = nfs_umount_begin, | |
284 | .show_options = nfs_show_options, | |
285 | .show_stats = nfs_show_stats, | |
48b605f8 | 286 | .remount_fs = nfs_remount, |
f7b422b1 DH |
287 | }; |
288 | #endif | |
289 | ||
8e1f936b RR |
290 | static struct shrinker acl_shrinker = { |
291 | .shrink = nfs_access_cache_shrinker, | |
292 | .seeks = DEFAULT_SEEKS, | |
293 | }; | |
979df72e | 294 | |
f7b422b1 DH |
295 | /* |
296 | * Register the NFS filesystems | |
297 | */ | |
298 | int __init register_nfs_fs(void) | |
299 | { | |
300 | int ret; | |
301 | ||
302 | ret = register_filesystem(&nfs_fs_type); | |
303 | if (ret < 0) | |
304 | goto error_0; | |
305 | ||
f7b422b1 DH |
306 | ret = nfs_register_sysctl(); |
307 | if (ret < 0) | |
308 | goto error_1; | |
89a09141 | 309 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
310 | ret = register_filesystem(&nfs4_fs_type); |
311 | if (ret < 0) | |
312 | goto error_2; | |
313 | #endif | |
8e1f936b | 314 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
315 | return 0; |
316 | ||
317 | #ifdef CONFIG_NFS_V4 | |
318 | error_2: | |
319 | nfs_unregister_sysctl(); | |
89a09141 | 320 | #endif |
f7b422b1 DH |
321 | error_1: |
322 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
323 | error_0: |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Unregister the NFS filesystems | |
329 | */ | |
330 | void __exit unregister_nfs_fs(void) | |
331 | { | |
8e1f936b | 332 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
333 | #ifdef CONFIG_NFS_V4 |
334 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 335 | #endif |
49af7ee1 | 336 | nfs_unregister_sysctl(); |
f7b422b1 DH |
337 | unregister_filesystem(&nfs_fs_type); |
338 | } | |
339 | ||
ef818a28 SD |
340 | void nfs_sb_active(struct nfs_server *server) |
341 | { | |
342 | atomic_inc(&server->active); | |
343 | } | |
344 | ||
345 | void nfs_sb_deactive(struct nfs_server *server) | |
346 | { | |
347 | if (atomic_dec_and_test(&server->active)) | |
348 | wake_up(&server->active_wq); | |
349 | } | |
350 | ||
351 | static void nfs_put_super(struct super_block *sb) | |
352 | { | |
353 | struct nfs_server *server = NFS_SB(sb); | |
354 | /* | |
355 | * Make sure there are no outstanding ops to this server. | |
356 | * If so, wait for them to finish before allowing the | |
357 | * unmount to continue. | |
358 | */ | |
359 | wait_event(server->active_wq, atomic_read(&server->active) == 0); | |
360 | } | |
361 | ||
f7b422b1 DH |
362 | /* |
363 | * Deliver file system statistics to userspace | |
364 | */ | |
816724e6 | 365 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 366 | { |
0c7d90cf | 367 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
368 | unsigned char blockbits; |
369 | unsigned long blockres; | |
0c7d90cf | 370 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
f7b422b1 DH |
371 | struct nfs_fattr fattr; |
372 | struct nfs_fsstat res = { | |
373 | .fattr = &fattr, | |
374 | }; | |
375 | int error; | |
376 | ||
8fa5c000 | 377 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
f7b422b1 DH |
378 | if (error < 0) |
379 | goto out_err; | |
1a0ba9ae | 380 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
381 | |
382 | /* | |
383 | * Current versions of glibc do not correctly handle the | |
384 | * case where f_frsize != f_bsize. Eventually we want to | |
385 | * report the value of wtmult in this field. | |
386 | */ | |
0c7d90cf | 387 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
388 | |
389 | /* | |
390 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
391 | * are reported in units of f_frsize. Linux hasn't had | |
392 | * an f_frsize field in its statfs struct until recently, | |
393 | * thus historically Linux's sys_statfs reports these | |
394 | * fields in units of f_bsize. | |
395 | */ | |
0c7d90cf DH |
396 | buf->f_bsize = dentry->d_sb->s_blocksize; |
397 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
398 | blockres = (1 << blockbits) - 1; |
399 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
400 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
401 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
402 | ||
403 | buf->f_files = res.tfiles; | |
404 | buf->f_ffree = res.afiles; | |
405 | ||
406 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 407 | |
f7b422b1 DH |
408 | return 0; |
409 | ||
410 | out_err: | |
3110ff80 | 411 | dprintk("%s: statfs error = %d\n", __func__, -error); |
1a0ba9ae | 412 | return error; |
f7b422b1 DH |
413 | } |
414 | ||
7d4e2747 DH |
415 | /* |
416 | * Map the security flavour number to a name | |
417 | */ | |
81039f1f TM |
418 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
419 | { | |
7d4e2747 | 420 | static const struct { |
81039f1f TM |
421 | rpc_authflavor_t flavour; |
422 | const char *str; | |
423 | } sec_flavours[] = { | |
424 | { RPC_AUTH_NULL, "null" }, | |
425 | { RPC_AUTH_UNIX, "sys" }, | |
426 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
427 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
428 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
429 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
430 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
431 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
432 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
433 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
434 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 435 | { UINT_MAX, "unknown" } |
81039f1f TM |
436 | }; |
437 | int i; | |
438 | ||
4d81cd16 | 439 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
440 | if (sec_flavours[i].flavour == flavour) |
441 | break; | |
442 | } | |
443 | return sec_flavours[i].str; | |
444 | } | |
445 | ||
82d101d5 CL |
446 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
447 | int showdefaults) | |
448 | { | |
449 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; | |
450 | ||
451 | switch (sap->sa_family) { | |
452 | case AF_INET: { | |
453 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
454 | seq_printf(m, ",mountaddr=" NIPQUAD_FMT, | |
455 | NIPQUAD(sin->sin_addr.s_addr)); | |
456 | break; | |
457 | } | |
458 | case AF_INET6: { | |
459 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
460 | seq_printf(m, ",mountaddr=" NIP6_FMT, | |
461 | NIP6(sin6->sin6_addr)); | |
462 | break; | |
463 | } | |
464 | default: | |
465 | if (showdefaults) | |
466 | seq_printf(m, ",mountaddr=unspecified"); | |
467 | } | |
468 | ||
469 | if (nfss->mountd_version || showdefaults) | |
470 | seq_printf(m, ",mountvers=%u", nfss->mountd_version); | |
471 | if (nfss->mountd_port || showdefaults) | |
472 | seq_printf(m, ",mountport=%u", nfss->mountd_port); | |
473 | ||
474 | switch (nfss->mountd_protocol) { | |
475 | case IPPROTO_UDP: | |
476 | seq_printf(m, ",mountproto=udp"); | |
477 | break; | |
478 | case IPPROTO_TCP: | |
479 | seq_printf(m, ",mountproto=tcp"); | |
480 | break; | |
481 | default: | |
482 | if (showdefaults) | |
483 | seq_printf(m, ",mountproto=auto"); | |
484 | } | |
485 | } | |
486 | ||
f7b422b1 DH |
487 | /* |
488 | * Describe the mount options in force on this server representation | |
489 | */ | |
82d101d5 CL |
490 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
491 | int showdefaults) | |
f7b422b1 | 492 | { |
509de811 | 493 | static const struct proc_nfs_info { |
f7b422b1 | 494 | int flag; |
509de811 DH |
495 | const char *str; |
496 | const char *nostr; | |
f7b422b1 DH |
497 | } nfs_info[] = { |
498 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
82d101d5 CL |
499 | { NFS_MOUNT_INTR, ",intr", ",nointr" }, |
500 | { NFS_MOUNT_POSIX, ",posix", "" }, | |
f7b422b1 DH |
501 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
502 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
503 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
504 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 505 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
75180df2 | 506 | { NFS_MOUNT_UNSHARED, ",nosharecache", ""}, |
f7b422b1 DH |
507 | { 0, NULL, NULL } |
508 | }; | |
509de811 | 509 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 510 | struct nfs_client *clp = nfss->nfs_client; |
82d101d5 | 511 | u32 version = clp->rpc_ops->version; |
f7b422b1 | 512 | |
82d101d5 | 513 | seq_printf(m, ",vers=%u", version); |
2d767432 CL |
514 | seq_printf(m, ",rsize=%u", nfss->rsize); |
515 | seq_printf(m, ",wsize=%u", nfss->wsize); | |
82d101d5 CL |
516 | if (nfss->bsize != 0) |
517 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
518 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
0e0cab74 | 519 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
2d767432 | 520 | seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
0e0cab74 | 521 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
2d767432 | 522 | seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
0e0cab74 | 523 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
2d767432 | 524 | seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
0e0cab74 | 525 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
2d767432 | 526 | seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
f7b422b1 DH |
527 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
528 | if (nfss->flags & nfs_infop->flag) | |
529 | seq_puts(m, nfs_infop->str); | |
530 | else | |
531 | seq_puts(m, nfs_infop->nostr); | |
532 | } | |
56928edd TT |
533 | seq_printf(m, ",proto=%s", |
534 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); | |
82d101d5 CL |
535 | if (version == 4) { |
536 | if (nfss->port != NFS_PORT) | |
537 | seq_printf(m, ",port=%u", nfss->port); | |
538 | } else | |
539 | if (nfss->port) | |
540 | seq_printf(m, ",port=%u", nfss->port); | |
541 | ||
33170233 TM |
542 | seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
543 | seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); | |
81039f1f | 544 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
82d101d5 CL |
545 | |
546 | if (version != 4) | |
547 | nfs_show_mountd_options(m, nfss, showdefaults); | |
548 | ||
549 | #ifdef CONFIG_NFS_V4 | |
550 | if (clp->rpc_ops->version == 4) | |
551 | seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); | |
552 | #endif | |
f7b422b1 DH |
553 | } |
554 | ||
555 | /* | |
556 | * Describe the mount options on this VFS mountpoint | |
557 | */ | |
558 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
559 | { | |
560 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
561 | ||
562 | nfs_show_mount_options(m, nfss, 0); | |
563 | ||
5d8515ca CL |
564 | seq_printf(m, ",addr=%s", |
565 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
566 | RPC_DISPLAY_ADDR)); | |
f7b422b1 DH |
567 | |
568 | return 0; | |
569 | } | |
570 | ||
571 | /* | |
572 | * Present statistical information for this VFS mountpoint | |
573 | */ | |
574 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
575 | { | |
576 | int i, cpu; | |
577 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
578 | struct rpc_auth *auth = nfss->client->cl_auth; | |
579 | struct nfs_iostats totals = { }; | |
580 | ||
581 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
582 | ||
583 | /* | |
584 | * Display all mount option settings | |
585 | */ | |
586 | seq_printf(m, "\n\topts:\t"); | |
587 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
588 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
589 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
590 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
591 | nfs_show_mount_options(m, nfss, 1); | |
592 | ||
593 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
594 | ||
595 | seq_printf(m, "\n\tcaps:\t"); | |
596 | seq_printf(m, "caps=0x%x", nfss->caps); | |
2d767432 CL |
597 | seq_printf(m, ",wtmult=%u", nfss->wtmult); |
598 | seq_printf(m, ",dtsize=%u", nfss->dtsize); | |
599 | seq_printf(m, ",bsize=%u", nfss->bsize); | |
600 | seq_printf(m, ",namlen=%u", nfss->namelen); | |
f7b422b1 DH |
601 | |
602 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 603 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
604 | seq_printf(m, "\n\tnfsv4:\t"); |
605 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
606 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
607 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
608 | } | |
609 | #endif | |
610 | ||
611 | /* | |
612 | * Display security flavor in effect for this mount | |
613 | */ | |
2d767432 | 614 | seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
f7b422b1 | 615 | if (auth->au_flavor) |
2d767432 | 616 | seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
f7b422b1 DH |
617 | |
618 | /* | |
619 | * Display superblock I/O counters | |
620 | */ | |
621 | for_each_possible_cpu(cpu) { | |
622 | struct nfs_iostats *stats; | |
623 | ||
624 | preempt_disable(); | |
625 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
626 | ||
627 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
628 | totals.events[i] += stats->events[i]; | |
629 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
630 | totals.bytes[i] += stats->bytes[i]; | |
631 | ||
632 | preempt_enable(); | |
633 | } | |
634 | ||
635 | seq_printf(m, "\n\tevents:\t"); | |
636 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
637 | seq_printf(m, "%lu ", totals.events[i]); | |
638 | seq_printf(m, "\n\tbytes:\t"); | |
639 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
640 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
641 | seq_printf(m, "\n"); | |
642 | ||
643 | rpc_print_iostats(m, nfss->client); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 650 | * in response to xdev traversals and referrals |
f7b422b1 | 651 | */ |
42faad99 | 652 | static void nfs_umount_begin(struct super_block *sb) |
f7b422b1 | 653 | { |
42faad99 | 654 | struct nfs_server *server = NFS_SB(sb); |
fc6ae3cf TM |
655 | struct rpc_clnt *rpc; |
656 | ||
fc6ae3cf TM |
657 | /* -EIO all pending I/O */ |
658 | rpc = server->client_acl; | |
659 | if (!IS_ERR(rpc)) | |
660 | rpc_killall_tasks(rpc); | |
661 | rpc = server->client; | |
662 | if (!IS_ERR(rpc)) | |
663 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
664 | } |
665 | ||
04dcd6e3 CL |
666 | /* |
667 | * Set the port number in an address. Be agnostic about the address family. | |
668 | */ | |
669 | static void nfs_set_port(struct sockaddr *sap, unsigned short port) | |
670 | { | |
671 | switch (sap->sa_family) { | |
672 | case AF_INET: { | |
673 | struct sockaddr_in *ap = (struct sockaddr_in *)sap; | |
674 | ap->sin_port = htons(port); | |
675 | break; | |
676 | } | |
677 | case AF_INET6: { | |
678 | struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; | |
679 | ap->sin6_port = htons(port); | |
680 | break; | |
681 | } | |
682 | } | |
683 | } | |
684 | ||
fc50d58f | 685 | /* |
cdcd7f9a CL |
686 | * Sanity-check a server address provided by the mount command. |
687 | * | |
688 | * Address family must be initialized, and address must not be | |
689 | * the ANY address for that family. | |
fc50d58f CL |
690 | */ |
691 | static int nfs_verify_server_address(struct sockaddr *addr) | |
692 | { | |
693 | switch (addr->sa_family) { | |
694 | case AF_INET: { | |
cdcd7f9a | 695 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
e6f1cebf | 696 | return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
cdcd7f9a CL |
697 | } |
698 | case AF_INET6: { | |
699 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
700 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
701 | } |
702 | } | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
ce3b7e19 CL |
707 | static void nfs_parse_ipv4_address(char *string, size_t str_len, |
708 | struct sockaddr *sap, size_t *addr_len) | |
9412b927 | 709 | { |
ce3b7e19 CL |
710 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
711 | u8 *addr = (u8 *)&sin->sin_addr.s_addr; | |
9412b927 | 712 | |
ce3b7e19 CL |
713 | if (str_len <= INET_ADDRSTRLEN) { |
714 | dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n", | |
715 | (int)str_len, string); | |
716 | ||
717 | sin->sin_family = AF_INET; | |
718 | *addr_len = sizeof(*sin); | |
719 | if (in4_pton(string, str_len, addr, '\0', NULL)) | |
3c7c7e48 | 720 | return; |
ce3b7e19 CL |
721 | } |
722 | ||
723 | sap->sa_family = AF_UNSPEC; | |
724 | *addr_len = 0; | |
725 | } | |
726 | ||
d8e7748a CL |
727 | #define IPV6_SCOPE_DELIMITER '%' |
728 | ||
ce3b7e19 | 729 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
d8e7748a CL |
730 | static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len, |
731 | const char *delim, | |
732 | struct sockaddr_in6 *sin6) | |
733 | { | |
734 | char *p; | |
735 | size_t len; | |
736 | ||
737 | if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)) | |
738 | return ; | |
739 | if (*delim != IPV6_SCOPE_DELIMITER) | |
740 | return; | |
741 | ||
742 | len = (string + str_len) - delim - 1; | |
743 | p = kstrndup(delim + 1, len, GFP_KERNEL); | |
744 | if (p) { | |
745 | unsigned long scope_id = 0; | |
746 | struct net_device *dev; | |
747 | ||
748 | dev = dev_get_by_name(&init_net, p); | |
749 | if (dev != NULL) { | |
750 | scope_id = dev->ifindex; | |
751 | dev_put(dev); | |
752 | } else { | |
753 | /* scope_id is set to zero on error */ | |
754 | strict_strtoul(p, 10, &scope_id); | |
755 | } | |
756 | ||
757 | kfree(p); | |
758 | sin6->sin6_scope_id = scope_id; | |
759 | dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id); | |
760 | } | |
761 | } | |
762 | ||
ce3b7e19 CL |
763 | static void nfs_parse_ipv6_address(char *string, size_t str_len, |
764 | struct sockaddr *sap, size_t *addr_len) | |
765 | { | |
766 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
767 | u8 *addr = (u8 *)&sin6->sin6_addr.in6_u; | |
d8e7748a | 768 | const char *delim; |
ce3b7e19 CL |
769 | |
770 | if (str_len <= INET6_ADDRSTRLEN) { | |
771 | dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n", | |
772 | (int)str_len, string); | |
3c7c7e48 | 773 | |
ce3b7e19 CL |
774 | sin6->sin6_family = AF_INET6; |
775 | *addr_len = sizeof(*sin6); | |
d8e7748a CL |
776 | if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) { |
777 | nfs_parse_ipv6_scope_id(string, str_len, delim, sin6); | |
3c7c7e48 | 778 | return; |
d8e7748a | 779 | } |
3c7c7e48 | 780 | } |
9412b927 CL |
781 | |
782 | sap->sa_family = AF_UNSPEC; | |
ce3b7e19 CL |
783 | *addr_len = 0; |
784 | } | |
785 | #else | |
786 | static void nfs_parse_ipv6_address(char *string, size_t str_len, | |
787 | struct sockaddr *sap, size_t *addr_len) | |
788 | { | |
789 | sap->sa_family = AF_UNSPEC; | |
790 | *addr_len = 0; | |
791 | } | |
792 | #endif | |
793 | ||
794 | /* | |
795 | * Construct a sockaddr based on the contents of a string that contains | |
796 | * an IP address in presentation format. | |
797 | * | |
798 | * If there is a problem constructing the new sockaddr, set the address | |
799 | * family to AF_UNSPEC. | |
800 | */ | |
801 | static void nfs_parse_ip_address(char *string, size_t str_len, | |
802 | struct sockaddr *sap, size_t *addr_len) | |
803 | { | |
804 | unsigned int i, colons; | |
805 | ||
806 | colons = 0; | |
807 | for (i = 0; i < str_len; i++) | |
808 | if (string[i] == ':') | |
809 | colons++; | |
810 | ||
811 | if (colons >= 2) | |
812 | nfs_parse_ipv6_address(string, str_len, sap, addr_len); | |
813 | else | |
814 | nfs_parse_ipv4_address(string, str_len, sap, addr_len); | |
9412b927 CL |
815 | } |
816 | ||
259875ef TM |
817 | /* |
818 | * Sanity check the NFS transport protocol. | |
819 | * | |
820 | */ | |
821 | static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
822 | { | |
823 | switch (mnt->nfs_server.protocol) { | |
824 | case XPRT_TRANSPORT_UDP: | |
825 | case XPRT_TRANSPORT_TCP: | |
826 | case XPRT_TRANSPORT_RDMA: | |
827 | break; | |
828 | default: | |
829 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; | |
830 | } | |
831 | } | |
832 | ||
833 | /* | |
834 | * For text based NFSv2/v3 mounts, the mount protocol transport default | |
835 | * settings should depend upon the specified NFS transport. | |
836 | */ | |
837 | static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) | |
838 | { | |
839 | nfs_validate_transport_protocol(mnt); | |
840 | ||
841 | if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || | |
842 | mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) | |
843 | return; | |
844 | switch (mnt->nfs_server.protocol) { | |
845 | case XPRT_TRANSPORT_UDP: | |
846 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; | |
847 | break; | |
848 | case XPRT_TRANSPORT_TCP: | |
849 | case XPRT_TRANSPORT_RDMA: | |
850 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; | |
851 | } | |
852 | } | |
853 | ||
01060c89 CL |
854 | /* |
855 | * Parse the value of the 'sec=' option. | |
856 | * | |
dd07c947 | 857 | * The flavor_len setting is for v4 mounts. |
01060c89 CL |
858 | */ |
859 | static int nfs_parse_security_flavors(char *value, | |
860 | struct nfs_parsed_mount_data *mnt) | |
861 | { | |
862 | substring_t args[MAX_OPT_ARGS]; | |
863 | ||
864 | dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); | |
865 | ||
866 | switch (match_token(value, nfs_secflavor_tokens, args)) { | |
867 | case Opt_sec_none: | |
01060c89 CL |
868 | mnt->auth_flavor_len = 0; |
869 | mnt->auth_flavors[0] = RPC_AUTH_NULL; | |
870 | break; | |
871 | case Opt_sec_sys: | |
01060c89 CL |
872 | mnt->auth_flavor_len = 0; |
873 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; | |
874 | break; | |
875 | case Opt_sec_krb5: | |
01060c89 CL |
876 | mnt->auth_flavor_len = 1; |
877 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; | |
878 | break; | |
879 | case Opt_sec_krb5i: | |
01060c89 CL |
880 | mnt->auth_flavor_len = 1; |
881 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; | |
882 | break; | |
883 | case Opt_sec_krb5p: | |
01060c89 CL |
884 | mnt->auth_flavor_len = 1; |
885 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; | |
886 | break; | |
887 | case Opt_sec_lkey: | |
01060c89 CL |
888 | mnt->auth_flavor_len = 1; |
889 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; | |
890 | break; | |
891 | case Opt_sec_lkeyi: | |
01060c89 CL |
892 | mnt->auth_flavor_len = 1; |
893 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; | |
894 | break; | |
895 | case Opt_sec_lkeyp: | |
01060c89 CL |
896 | mnt->auth_flavor_len = 1; |
897 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; | |
898 | break; | |
899 | case Opt_sec_spkm: | |
01060c89 CL |
900 | mnt->auth_flavor_len = 1; |
901 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; | |
902 | break; | |
903 | case Opt_sec_spkmi: | |
01060c89 CL |
904 | mnt->auth_flavor_len = 1; |
905 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; | |
906 | break; | |
907 | case Opt_sec_spkmp: | |
01060c89 CL |
908 | mnt->auth_flavor_len = 1; |
909 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; | |
910 | break; | |
911 | default: | |
912 | return 0; | |
913 | } | |
914 | ||
915 | return 1; | |
916 | } | |
917 | ||
f45663ce CL |
918 | static void nfs_parse_invalid_value(const char *option) |
919 | { | |
920 | dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option); | |
921 | } | |
922 | ||
bf0fd768 CL |
923 | /* |
924 | * Error-check and convert a string of mount options from user space into | |
f45663ce CL |
925 | * a data structure. The whole mount string is processed; bad options are |
926 | * skipped as they are encountered. If there were no errors, return 1; | |
927 | * otherwise return 0 (zero). | |
bf0fd768 CL |
928 | */ |
929 | static int nfs_parse_mount_options(char *raw, | |
930 | struct nfs_parsed_mount_data *mnt) | |
931 | { | |
f9c3a380 | 932 | char *p, *string, *secdata; |
f45663ce | 933 | int rc, sloppy = 0, errors = 0; |
bf0fd768 CL |
934 | |
935 | if (!raw) { | |
936 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
937 | return 1; | |
938 | } | |
939 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
940 | ||
f9c3a380 EP |
941 | secdata = alloc_secdata(); |
942 | if (!secdata) | |
943 | goto out_nomem; | |
944 | ||
945 | rc = security_sb_copy_data(raw, secdata); | |
946 | if (rc) | |
947 | goto out_security_failure; | |
948 | ||
949 | rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); | |
950 | if (rc) | |
951 | goto out_security_failure; | |
952 | ||
953 | free_secdata(secdata); | |
954 | ||
bf0fd768 CL |
955 | while ((p = strsep(&raw, ",")) != NULL) { |
956 | substring_t args[MAX_OPT_ARGS]; | |
957 | int option, token; | |
958 | ||
959 | if (!*p) | |
960 | continue; | |
961 | ||
962 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
963 | ||
964 | token = match_token(p, nfs_mount_option_tokens, args); | |
965 | switch (token) { | |
f45663ce CL |
966 | |
967 | /* | |
968 | * boolean options: foo/nofoo | |
969 | */ | |
bf0fd768 CL |
970 | case Opt_soft: |
971 | mnt->flags |= NFS_MOUNT_SOFT; | |
972 | break; | |
973 | case Opt_hard: | |
974 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
975 | break; | |
bf0fd768 CL |
976 | case Opt_posix: |
977 | mnt->flags |= NFS_MOUNT_POSIX; | |
978 | break; | |
979 | case Opt_noposix: | |
980 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
981 | break; | |
982 | case Opt_cto: | |
983 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
984 | break; | |
985 | case Opt_nocto: | |
986 | mnt->flags |= NFS_MOUNT_NOCTO; | |
987 | break; | |
988 | case Opt_ac: | |
989 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
990 | break; | |
991 | case Opt_noac: | |
992 | mnt->flags |= NFS_MOUNT_NOAC; | |
993 | break; | |
994 | case Opt_lock: | |
995 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
996 | break; | |
997 | case Opt_nolock: | |
998 | mnt->flags |= NFS_MOUNT_NONLM; | |
999 | break; | |
1000 | case Opt_v2: | |
1001 | mnt->flags &= ~NFS_MOUNT_VER3; | |
1002 | break; | |
1003 | case Opt_v3: | |
1004 | mnt->flags |= NFS_MOUNT_VER3; | |
1005 | break; | |
1006 | case Opt_udp: | |
1007 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 1008 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
1009 | break; |
1010 | case Opt_tcp: | |
1011 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 1012 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1013 | break; |
2cf7ff7a TT |
1014 | case Opt_rdma: |
1015 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
1016 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
2cf7ff7a | 1017 | break; |
bf0fd768 CL |
1018 | case Opt_acl: |
1019 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
1020 | break; | |
1021 | case Opt_noacl: | |
1022 | mnt->flags |= NFS_MOUNT_NOACL; | |
1023 | break; | |
1024 | case Opt_rdirplus: | |
1025 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
1026 | break; | |
1027 | case Opt_nordirplus: | |
1028 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
1029 | break; | |
75180df2 TM |
1030 | case Opt_sharecache: |
1031 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
1032 | break; | |
1033 | case Opt_nosharecache: | |
1034 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
1035 | break; | |
bf0fd768 | 1036 | |
f45663ce CL |
1037 | /* |
1038 | * options that take numeric values | |
1039 | */ | |
bf0fd768 | 1040 | case Opt_port: |
f45663ce CL |
1041 | if (match_int(args, &option) || |
1042 | option < 0 || option > USHORT_MAX) { | |
1043 | errors++; | |
1044 | nfs_parse_invalid_value("port"); | |
1045 | } else | |
1046 | mnt->nfs_server.port = option; | |
bf0fd768 CL |
1047 | break; |
1048 | case Opt_rsize: | |
f45663ce CL |
1049 | if (match_int(args, &option) || option < 0) { |
1050 | errors++; | |
1051 | nfs_parse_invalid_value("rsize"); | |
1052 | } else | |
1053 | mnt->rsize = option; | |
bf0fd768 CL |
1054 | break; |
1055 | case Opt_wsize: | |
f45663ce CL |
1056 | if (match_int(args, &option) || option < 0) { |
1057 | errors++; | |
1058 | nfs_parse_invalid_value("wsize"); | |
1059 | } else | |
1060 | mnt->wsize = option; | |
bf0fd768 CL |
1061 | break; |
1062 | case Opt_bsize: | |
f45663ce CL |
1063 | if (match_int(args, &option) || option < 0) { |
1064 | errors++; | |
1065 | nfs_parse_invalid_value("bsize"); | |
1066 | } else | |
1067 | mnt->bsize = option; | |
bf0fd768 CL |
1068 | break; |
1069 | case Opt_timeo: | |
f45663ce CL |
1070 | if (match_int(args, &option) || option <= 0) { |
1071 | errors++; | |
1072 | nfs_parse_invalid_value("timeo"); | |
1073 | } else | |
1074 | mnt->timeo = option; | |
bf0fd768 CL |
1075 | break; |
1076 | case Opt_retrans: | |
f45663ce CL |
1077 | if (match_int(args, &option) || option <= 0) { |
1078 | errors++; | |
1079 | nfs_parse_invalid_value("retrans"); | |
1080 | } else | |
1081 | mnt->retrans = option; | |
bf0fd768 CL |
1082 | break; |
1083 | case Opt_acregmin: | |
f45663ce CL |
1084 | if (match_int(args, &option) || option < 0) { |
1085 | errors++; | |
1086 | nfs_parse_invalid_value("acregmin"); | |
1087 | } else | |
1088 | mnt->acregmin = option; | |
bf0fd768 CL |
1089 | break; |
1090 | case Opt_acregmax: | |
f45663ce CL |
1091 | if (match_int(args, &option) || option < 0) { |
1092 | errors++; | |
1093 | nfs_parse_invalid_value("acregmax"); | |
1094 | } else | |
1095 | mnt->acregmax = option; | |
bf0fd768 CL |
1096 | break; |
1097 | case Opt_acdirmin: | |
f45663ce CL |
1098 | if (match_int(args, &option) || option < 0) { |
1099 | errors++; | |
1100 | nfs_parse_invalid_value("acdirmin"); | |
1101 | } else | |
1102 | mnt->acdirmin = option; | |
bf0fd768 CL |
1103 | break; |
1104 | case Opt_acdirmax: | |
f45663ce CL |
1105 | if (match_int(args, &option) || option < 0) { |
1106 | errors++; | |
1107 | nfs_parse_invalid_value("acdirmax"); | |
1108 | } else | |
1109 | mnt->acdirmax = option; | |
bf0fd768 CL |
1110 | break; |
1111 | case Opt_actimeo: | |
f45663ce CL |
1112 | if (match_int(args, &option) || option < 0) { |
1113 | errors++; | |
1114 | nfs_parse_invalid_value("actimeo"); | |
1115 | } else | |
1116 | mnt->acregmin = mnt->acregmax = | |
1117 | mnt->acdirmin = mnt->acdirmax = option; | |
bf0fd768 CL |
1118 | break; |
1119 | case Opt_namelen: | |
f45663ce CL |
1120 | if (match_int(args, &option) || option < 0) { |
1121 | errors++; | |
1122 | nfs_parse_invalid_value("namlen"); | |
1123 | } else | |
1124 | mnt->namlen = option; | |
bf0fd768 CL |
1125 | break; |
1126 | case Opt_mountport: | |
f45663ce CL |
1127 | if (match_int(args, &option) || |
1128 | option < 0 || option > USHORT_MAX) { | |
1129 | errors++; | |
1130 | nfs_parse_invalid_value("mountport"); | |
1131 | } else | |
1132 | mnt->mount_server.port = option; | |
bf0fd768 | 1133 | break; |
bf0fd768 | 1134 | case Opt_mountvers: |
f45663ce CL |
1135 | if (match_int(args, &option) || |
1136 | option < NFS_MNT_VERSION || | |
1137 | option > NFS_MNT3_VERSION) { | |
1138 | errors++; | |
1139 | nfs_parse_invalid_value("mountvers"); | |
1140 | } else | |
1141 | mnt->mount_server.version = option; | |
bf0fd768 | 1142 | break; |
bf0fd768 | 1143 | case Opt_nfsvers: |
f45663ce CL |
1144 | if (match_int(args, &option)) { |
1145 | errors++; | |
1146 | nfs_parse_invalid_value("nfsvers"); | |
1147 | break; | |
1148 | } | |
bf0fd768 | 1149 | switch (option) { |
f45663ce | 1150 | case NFS2_VERSION: |
bf0fd768 CL |
1151 | mnt->flags &= ~NFS_MOUNT_VER3; |
1152 | break; | |
f45663ce | 1153 | case NFS3_VERSION: |
bf0fd768 CL |
1154 | mnt->flags |= NFS_MOUNT_VER3; |
1155 | break; | |
1156 | default: | |
f45663ce CL |
1157 | errors++; |
1158 | nfs_parse_invalid_value("nfsvers"); | |
bf0fd768 CL |
1159 | } |
1160 | break; | |
1161 | ||
f45663ce CL |
1162 | /* |
1163 | * options that take text values | |
1164 | */ | |
bf0fd768 CL |
1165 | case Opt_sec: |
1166 | string = match_strdup(args); | |
1167 | if (string == NULL) | |
1168 | goto out_nomem; | |
01060c89 | 1169 | rc = nfs_parse_security_flavors(string, mnt); |
bf0fd768 | 1170 | kfree(string); |
f45663ce CL |
1171 | if (!rc) { |
1172 | errors++; | |
1173 | dfprintk(MOUNT, "NFS: unrecognized " | |
1174 | "security flavor\n"); | |
1175 | } | |
bf0fd768 CL |
1176 | break; |
1177 | case Opt_proto: | |
1178 | string = match_strdup(args); | |
1179 | if (string == NULL) | |
1180 | goto out_nomem; | |
1181 | token = match_token(string, | |
1182 | nfs_xprt_protocol_tokens, args); | |
1183 | kfree(string); | |
1184 | ||
1185 | switch (token) { | |
fdb66ff4 | 1186 | case Opt_xprt_udp: |
bf0fd768 | 1187 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 1188 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1189 | break; |
fdb66ff4 | 1190 | case Opt_xprt_tcp: |
bf0fd768 | 1191 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 1192 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1193 | break; |
2cf7ff7a TT |
1194 | case Opt_xprt_rdma: |
1195 | /* vector side protocols to TCP */ | |
1196 | mnt->flags |= NFS_MOUNT_TCP; | |
1197 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
2cf7ff7a | 1198 | break; |
bf0fd768 | 1199 | default: |
f45663ce CL |
1200 | errors++; |
1201 | dfprintk(MOUNT, "NFS: unrecognized " | |
1202 | "transport protocol\n"); | |
bf0fd768 CL |
1203 | } |
1204 | break; | |
1205 | case Opt_mountproto: | |
1206 | string = match_strdup(args); | |
1207 | if (string == NULL) | |
1208 | goto out_nomem; | |
1209 | token = match_token(string, | |
1210 | nfs_xprt_protocol_tokens, args); | |
1211 | kfree(string); | |
1212 | ||
1213 | switch (token) { | |
fdb66ff4 | 1214 | case Opt_xprt_udp: |
0896a725 | 1215 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 1216 | break; |
fdb66ff4 | 1217 | case Opt_xprt_tcp: |
0896a725 | 1218 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 1219 | break; |
2cf7ff7a | 1220 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 | 1221 | default: |
f45663ce CL |
1222 | errors++; |
1223 | dfprintk(MOUNT, "NFS: unrecognized " | |
1224 | "transport protocol\n"); | |
bf0fd768 CL |
1225 | } |
1226 | break; | |
1227 | case Opt_addr: | |
1228 | string = match_strdup(args); | |
1229 | if (string == NULL) | |
1230 | goto out_nomem; | |
ce3b7e19 CL |
1231 | nfs_parse_ip_address(string, strlen(string), |
1232 | (struct sockaddr *) | |
1233 | &mnt->nfs_server.address, | |
1234 | &mnt->nfs_server.addrlen); | |
bf0fd768 CL |
1235 | kfree(string); |
1236 | break; | |
1237 | case Opt_clientaddr: | |
1238 | string = match_strdup(args); | |
1239 | if (string == NULL) | |
1240 | goto out_nomem; | |
fc601477 | 1241 | kfree(mnt->client_address); |
bf0fd768 CL |
1242 | mnt->client_address = string; |
1243 | break; | |
33832034 CL |
1244 | case Opt_mounthost: |
1245 | string = match_strdup(args); | |
1246 | if (string == NULL) | |
1247 | goto out_nomem; | |
fc601477 | 1248 | kfree(mnt->mount_server.hostname); |
33832034 CL |
1249 | mnt->mount_server.hostname = string; |
1250 | break; | |
0ac83779 | 1251 | case Opt_mountaddr: |
bf0fd768 CL |
1252 | string = match_strdup(args); |
1253 | if (string == NULL) | |
1254 | goto out_nomem; | |
ce3b7e19 CL |
1255 | nfs_parse_ip_address(string, strlen(string), |
1256 | (struct sockaddr *) | |
1257 | &mnt->mount_server.address, | |
1258 | &mnt->mount_server.addrlen); | |
bf0fd768 CL |
1259 | kfree(string); |
1260 | break; | |
1261 | ||
f45663ce CL |
1262 | /* |
1263 | * Special options | |
1264 | */ | |
1265 | case Opt_sloppy: | |
1266 | sloppy = 1; | |
1267 | dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); | |
1268 | break; | |
bf0fd768 CL |
1269 | case Opt_userspace: |
1270 | case Opt_deprecated: | |
d33e4dfe CL |
1271 | dfprintk(MOUNT, "NFS: ignoring mount option " |
1272 | "'%s'\n", p); | |
bf0fd768 CL |
1273 | break; |
1274 | ||
1275 | default: | |
f45663ce CL |
1276 | errors++; |
1277 | dfprintk(MOUNT, "NFS: unrecognized mount option " | |
1278 | "'%s'\n", p); | |
bf0fd768 CL |
1279 | } |
1280 | } | |
1281 | ||
1282 | return 1; | |
1283 | ||
1284 | out_nomem: | |
1285 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1286 | return 0; | |
f9c3a380 EP |
1287 | out_security_failure: |
1288 | free_secdata(secdata); | |
1289 | printk(KERN_INFO "NFS: security options invalid: %d\n", rc); | |
1290 | return 0; | |
bf0fd768 CL |
1291 | } |
1292 | ||
0076d7b7 CL |
1293 | /* |
1294 | * Use the remote server's MOUNT service to request the NFS file handle | |
1295 | * corresponding to the provided path. | |
1296 | */ | |
1297 | static int nfs_try_mount(struct nfs_parsed_mount_data *args, | |
1298 | struct nfs_fh *root_fh) | |
1299 | { | |
4c568017 | 1300 | struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address; |
33832034 | 1301 | char *hostname; |
4c568017 | 1302 | int status; |
0076d7b7 CL |
1303 | |
1304 | if (args->mount_server.version == 0) { | |
1305 | if (args->flags & NFS_MOUNT_VER3) | |
1306 | args->mount_server.version = NFS_MNT3_VERSION; | |
1307 | else | |
1308 | args->mount_server.version = NFS_MNT_VERSION; | |
1309 | } | |
1310 | ||
33832034 CL |
1311 | if (args->mount_server.hostname) |
1312 | hostname = args->mount_server.hostname; | |
1313 | else | |
1314 | hostname = args->nfs_server.hostname; | |
1315 | ||
0076d7b7 CL |
1316 | /* |
1317 | * Construct the mount server's address. | |
1318 | */ | |
4c568017 CL |
1319 | if (args->mount_server.address.ss_family == AF_UNSPEC) { |
1320 | memcpy(sap, &args->nfs_server.address, | |
1321 | args->nfs_server.addrlen); | |
1322 | args->mount_server.addrlen = args->nfs_server.addrlen; | |
1323 | } | |
1324 | ||
aad70007 JL |
1325 | /* |
1326 | * autobind will be used if mount_server.port == 0 | |
1327 | */ | |
4c568017 | 1328 | nfs_set_port(sap, args->mount_server.port); |
0076d7b7 CL |
1329 | |
1330 | /* | |
1331 | * Now ask the mount server to map our export path | |
1332 | * to a file handle. | |
1333 | */ | |
4c568017 CL |
1334 | status = nfs_mount(sap, |
1335 | args->mount_server.addrlen, | |
33832034 | 1336 | hostname, |
0076d7b7 CL |
1337 | args->nfs_server.export_path, |
1338 | args->mount_server.version, | |
1339 | args->mount_server.protocol, | |
1340 | root_fh); | |
efd8340b CL |
1341 | if (status == 0) |
1342 | return 0; | |
0076d7b7 | 1343 | |
396cee97 | 1344 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", |
33832034 | 1345 | hostname, status); |
0076d7b7 CL |
1346 | return status; |
1347 | } | |
1348 | ||
d1aa0825 CL |
1349 | static int nfs_parse_simple_hostname(const char *dev_name, |
1350 | char **hostname, size_t maxnamlen, | |
1351 | char **export_path, size_t maxpathlen) | |
dc045898 CL |
1352 | { |
1353 | size_t len; | |
1354 | char *colon, *comma; | |
1355 | ||
1356 | colon = strchr(dev_name, ':'); | |
1357 | if (colon == NULL) | |
1358 | goto out_bad_devname; | |
1359 | ||
1360 | len = colon - dev_name; | |
1361 | if (len > maxnamlen) | |
1362 | goto out_hostname; | |
1363 | ||
1364 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
1365 | *hostname = kstrndup(dev_name, len, GFP_KERNEL); | |
1366 | if (!*hostname) | |
1367 | goto out_nomem; | |
1368 | ||
1369 | /* kill possible hostname list: not supported */ | |
1370 | comma = strchr(*hostname, ','); | |
1371 | if (comma != NULL) { | |
1372 | if (comma == *hostname) | |
1373 | goto out_bad_devname; | |
1374 | *comma = '\0'; | |
1375 | } | |
1376 | ||
1377 | colon++; | |
1378 | len = strlen(colon); | |
1379 | if (len > maxpathlen) | |
1380 | goto out_path; | |
1381 | *export_path = kstrndup(colon, len, GFP_KERNEL); | |
1382 | if (!*export_path) | |
1383 | goto out_nomem; | |
1384 | ||
1385 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); | |
1386 | return 0; | |
1387 | ||
1388 | out_bad_devname: | |
1389 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1390 | return -EINVAL; | |
1391 | ||
1392 | out_nomem: | |
1393 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1394 | return -ENOMEM; | |
1395 | ||
1396 | out_hostname: | |
1397 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1398 | return -ENAMETOOLONG; | |
1399 | ||
1400 | out_path: | |
1401 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1402 | return -ENAMETOOLONG; | |
1403 | } | |
1404 | ||
d1aa0825 CL |
1405 | /* |
1406 | * Hostname has square brackets around it because it contains one or | |
1407 | * more colons. We look for the first closing square bracket, and a | |
1408 | * colon must follow it. | |
1409 | */ | |
1410 | static int nfs_parse_protected_hostname(const char *dev_name, | |
1411 | char **hostname, size_t maxnamlen, | |
1412 | char **export_path, size_t maxpathlen) | |
1413 | { | |
1414 | size_t len; | |
1415 | char *start, *end; | |
1416 | ||
1417 | start = (char *)(dev_name + 1); | |
1418 | ||
1419 | end = strchr(start, ']'); | |
1420 | if (end == NULL) | |
1421 | goto out_bad_devname; | |
1422 | if (*(end + 1) != ':') | |
1423 | goto out_bad_devname; | |
1424 | ||
1425 | len = end - start; | |
1426 | if (len > maxnamlen) | |
1427 | goto out_hostname; | |
1428 | ||
1429 | /* N.B. caller will free nfs_server.hostname in all cases */ | |
1430 | *hostname = kstrndup(start, len, GFP_KERNEL); | |
1431 | if (*hostname == NULL) | |
1432 | goto out_nomem; | |
1433 | ||
1434 | end += 2; | |
1435 | len = strlen(end); | |
1436 | if (len > maxpathlen) | |
1437 | goto out_path; | |
1438 | *export_path = kstrndup(end, len, GFP_KERNEL); | |
1439 | if (!*export_path) | |
1440 | goto out_nomem; | |
1441 | ||
1442 | return 0; | |
1443 | ||
1444 | out_bad_devname: | |
1445 | dfprintk(MOUNT, "NFS: device name not in host:path format\n"); | |
1446 | return -EINVAL; | |
1447 | ||
1448 | out_nomem: | |
1449 | dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); | |
1450 | return -ENOMEM; | |
1451 | ||
1452 | out_hostname: | |
1453 | dfprintk(MOUNT, "NFS: server hostname too long\n"); | |
1454 | return -ENAMETOOLONG; | |
1455 | ||
1456 | out_path: | |
1457 | dfprintk(MOUNT, "NFS: export pathname too long\n"); | |
1458 | return -ENAMETOOLONG; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Split "dev_name" into "hostname:export_path". | |
1463 | * | |
1464 | * The leftmost colon demarks the split between the server's hostname | |
1465 | * and the export path. If the hostname starts with a left square | |
1466 | * bracket, then it may contain colons. | |
1467 | * | |
1468 | * Note: caller frees hostname and export path, even on error. | |
1469 | */ | |
1470 | static int nfs_parse_devname(const char *dev_name, | |
1471 | char **hostname, size_t maxnamlen, | |
1472 | char **export_path, size_t maxpathlen) | |
1473 | { | |
1474 | if (*dev_name == '[') | |
1475 | return nfs_parse_protected_hostname(dev_name, | |
1476 | hostname, maxnamlen, | |
1477 | export_path, maxpathlen); | |
1478 | ||
1479 | return nfs_parse_simple_hostname(dev_name, | |
1480 | hostname, maxnamlen, | |
1481 | export_path, maxpathlen); | |
1482 | } | |
1483 | ||
f7b422b1 | 1484 | /* |
54ceac45 DH |
1485 | * Validate the NFS2/NFS3 mount data |
1486 | * - fills in the mount root filehandle | |
136d558c CL |
1487 | * |
1488 | * For option strings, user space handles the following behaviors: | |
1489 | * | |
1490 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1491 | * | |
1492 | * + failure mode: how to behave if a mount request can't be handled | |
1493 | * immediately ("fg/bg" option) | |
1494 | * | |
1495 | * + retry: how often to retry a mount request ("retry=" option) | |
1496 | * | |
1497 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1498 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1499 | */ |
2283f8d6 TT |
1500 | static int nfs_validate_mount_data(void *options, |
1501 | struct nfs_parsed_mount_data *args, | |
136d558c CL |
1502 | struct nfs_fh *mntfh, |
1503 | const char *dev_name) | |
f7b422b1 | 1504 | { |
2283f8d6 | 1505 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
136d558c | 1506 | |
5df36e78 CL |
1507 | if (data == NULL) |
1508 | goto out_no_data; | |
f7b422b1 | 1509 | |
2283f8d6 TT |
1510 | args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); |
1511 | args->rsize = NFS_MAX_FILE_IO_SIZE; | |
1512 | args->wsize = NFS_MAX_FILE_IO_SIZE; | |
0e0cab74 CL |
1513 | args->acregmin = NFS_DEF_ACREGMIN; |
1514 | args->acregmax = NFS_DEF_ACREGMAX; | |
1515 | args->acdirmin = NFS_DEF_ACDIRMIN; | |
1516 | args->acdirmax = NFS_DEF_ACDIRMAX; | |
f22d6d79 | 1517 | args->mount_server.port = 0; /* autobind unless user sets port */ |
f22d6d79 | 1518 | args->nfs_server.port = 0; /* autobind unless user sets port */ |
0896a725 | 1519 | args->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
dd07c947 | 1520 | args->auth_flavors[0] = RPC_AUTH_UNIX; |
2283f8d6 | 1521 | |
54ceac45 | 1522 | switch (data->version) { |
5df36e78 CL |
1523 | case 1: |
1524 | data->namlen = 0; | |
1525 | case 2: | |
1526 | data->bsize = 0; | |
1527 | case 3: | |
1528 | if (data->flags & NFS_MOUNT_VER3) | |
1529 | goto out_no_v3; | |
1530 | data->root.size = NFS2_FHSIZE; | |
1531 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1532 | case 4: | |
1533 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1534 | goto out_no_sec; | |
1535 | case 5: | |
1536 | memset(data->context, 0, sizeof(data->context)); | |
1537 | case 6: | |
b7e24457 TM |
1538 | if (data->flags & NFS_MOUNT_VER3) { |
1539 | if (data->root.size > NFS3_FHSIZE || data->root.size == 0) | |
1540 | goto out_invalid_fh; | |
5df36e78 | 1541 | mntfh->size = data->root.size; |
b7e24457 | 1542 | } else |
5df36e78 CL |
1543 | mntfh->size = NFS2_FHSIZE; |
1544 | ||
5df36e78 CL |
1545 | |
1546 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1547 | if (mntfh->size < sizeof(mntfh->data)) | |
1548 | memset(mntfh->data + mntfh->size, 0, | |
1549 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 | 1550 | |
2283f8d6 TT |
1551 | /* |
1552 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1553 | * can deal with. | |
1554 | */ | |
1555 | args->flags = data->flags; | |
1556 | args->rsize = data->rsize; | |
1557 | args->wsize = data->wsize; | |
2283f8d6 TT |
1558 | args->timeo = data->timeo; |
1559 | args->retrans = data->retrans; | |
1560 | args->acregmin = data->acregmin; | |
1561 | args->acregmax = data->acregmax; | |
1562 | args->acdirmin = data->acdirmin; | |
1563 | args->acdirmax = data->acdirmax; | |
4c568017 CL |
1564 | |
1565 | memcpy(&args->nfs_server.address, &data->addr, | |
1566 | sizeof(data->addr)); | |
1567 | args->nfs_server.addrlen = sizeof(data->addr); | |
1568 | if (!nfs_verify_server_address((struct sockaddr *) | |
1569 | &args->nfs_server.address)) | |
1570 | goto out_no_address; | |
1571 | ||
2283f8d6 | 1572 | if (!(data->flags & NFS_MOUNT_TCP)) |
0896a725 | 1573 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1574 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1575 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1576 | args->namlen = data->namlen; | |
1577 | args->bsize = data->bsize; | |
dd07c947 CL |
1578 | |
1579 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1580 | args->auth_flavors[0] = data->pseudoflavor; | |
63649bd7 CG |
1581 | if (!args->nfs_server.hostname) |
1582 | goto out_nomem; | |
f9c3a380 EP |
1583 | |
1584 | /* | |
1585 | * The legacy version 6 binary mount data from userspace has a | |
1586 | * field used only to transport selinux information into the | |
1587 | * the kernel. To continue to support that functionality we | |
1588 | * have a touch of selinux knowledge here in the NFS code. The | |
1589 | * userspace code converted context=blah to just blah so we are | |
1590 | * converting back to the full string selinux understands. | |
1591 | */ | |
1592 | if (data->context[0]){ | |
1593 | #ifdef CONFIG_SECURITY_SELINUX | |
1594 | int rc; | |
1595 | char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); | |
1596 | if (!opts_str) | |
1597 | return -ENOMEM; | |
1598 | strcpy(opts_str, "context="); | |
1599 | data->context[NFS_MAX_CONTEXT_LEN] = '\0'; | |
1600 | strcat(opts_str, &data->context[0]); | |
1601 | rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); | |
1602 | kfree(opts_str); | |
1603 | if (rc) | |
1604 | return rc; | |
1605 | #else | |
1606 | return -EINVAL; | |
1607 | #endif | |
1608 | } | |
1609 | ||
5df36e78 | 1610 | break; |
136d558c | 1611 | default: { |
136d558c | 1612 | int status; |
136d558c | 1613 | |
2283f8d6 TT |
1614 | if (nfs_parse_mount_options((char *)options, args) == 0) |
1615 | return -EINVAL; | |
136d558c | 1616 | |
6e88e061 CL |
1617 | if (!nfs_verify_server_address((struct sockaddr *) |
1618 | &args->nfs_server.address)) | |
1619 | goto out_no_address; | |
1620 | ||
ed596a8a CL |
1621 | nfs_set_port((struct sockaddr *)&args->nfs_server.address, |
1622 | args->nfs_server.port); | |
1623 | ||
259875ef TM |
1624 | nfs_set_mount_transport_protocol(args); |
1625 | ||
dc045898 CL |
1626 | status = nfs_parse_devname(dev_name, |
1627 | &args->nfs_server.hostname, | |
1628 | PAGE_SIZE, | |
1629 | &args->nfs_server.export_path, | |
1630 | NFS_MAXPATHLEN); | |
1631 | if (!status) | |
1632 | status = nfs_try_mount(args, mntfh); | |
136d558c | 1633 | |
dc045898 CL |
1634 | kfree(args->nfs_server.export_path); |
1635 | args->nfs_server.export_path = NULL; | |
136d558c | 1636 | |
136d558c | 1637 | if (status) |
fdc6e2c8 | 1638 | return status; |
136d558c | 1639 | |
136d558c CL |
1640 | break; |
1641 | } | |
f7b422b1 | 1642 | } |
54ceac45 DH |
1643 | |
1644 | #ifndef CONFIG_NFS_V3 | |
2283f8d6 | 1645 | if (args->flags & NFS_MOUNT_VER3) |
5df36e78 CL |
1646 | goto out_v3_not_compiled; |
1647 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1648 | |
5df36e78 | 1649 | return 0; |
f7b422b1 | 1650 | |
5df36e78 CL |
1651 | out_no_data: |
1652 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1653 | return -EINVAL; | |
54ceac45 | 1654 | |
5df36e78 CL |
1655 | out_no_v3: |
1656 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1657 | data->version); | |
1658 | return -EINVAL; | |
f7b422b1 | 1659 | |
5df36e78 CL |
1660 | out_no_sec: |
1661 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1662 | return -EINVAL; | |
1663 | ||
5df36e78 CL |
1664 | #ifndef CONFIG_NFS_V3 |
1665 | out_v3_not_compiled: | |
1666 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1667 | return -EPROTONOSUPPORT; | |
1668 | #endif /* !CONFIG_NFS_V3 */ | |
1669 | ||
63649bd7 CG |
1670 | out_nomem: |
1671 | dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); | |
1672 | return -ENOMEM; | |
1673 | ||
5df36e78 CL |
1674 | out_no_address: |
1675 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
1676 | return -EINVAL; | |
1677 | ||
1678 | out_invalid_fh: | |
1679 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
1680 | return -EINVAL; | |
f7b422b1 DH |
1681 | } |
1682 | ||
48b605f8 JL |
1683 | static int |
1684 | nfs_compare_remount_data(struct nfs_server *nfss, | |
1685 | struct nfs_parsed_mount_data *data) | |
1686 | { | |
1687 | if (data->flags != nfss->flags || | |
1688 | data->rsize != nfss->rsize || | |
1689 | data->wsize != nfss->wsize || | |
1690 | data->retrans != nfss->client->cl_timeout->to_retries || | |
1691 | data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || | |
1692 | data->acregmin != nfss->acregmin / HZ || | |
1693 | data->acregmax != nfss->acregmax / HZ || | |
1694 | data->acdirmin != nfss->acdirmin / HZ || | |
1695 | data->acdirmax != nfss->acdirmax / HZ || | |
1696 | data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || | |
1697 | data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || | |
1698 | memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
1699 | data->nfs_server.addrlen) != 0) | |
1700 | return -EINVAL; | |
1701 | ||
1702 | return 0; | |
1703 | } | |
1704 | ||
1705 | static int | |
1706 | nfs_remount(struct super_block *sb, int *flags, char *raw_data) | |
1707 | { | |
1708 | int error; | |
1709 | struct nfs_server *nfss = sb->s_fs_info; | |
1710 | struct nfs_parsed_mount_data *data; | |
1711 | struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; | |
1712 | struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; | |
cd100725 | 1713 | u32 nfsvers = nfss->nfs_client->rpc_ops->version; |
48b605f8 JL |
1714 | |
1715 | /* | |
1716 | * Userspace mount programs that send binary options generally send | |
1717 | * them populated with default values. We have no way to know which | |
1718 | * ones were explicitly specified. Fall back to legacy behavior and | |
1719 | * just return success. | |
1720 | */ | |
cd100725 TM |
1721 | if ((nfsvers == 4 && options4->version == 1) || |
1722 | (nfsvers <= 3 && options->version >= 1 && | |
48b605f8 JL |
1723 | options->version <= 6)) |
1724 | return 0; | |
1725 | ||
1726 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1727 | if (data == NULL) | |
1728 | return -ENOMEM; | |
1729 | ||
1730 | /* fill out struct with values from existing mount */ | |
1731 | data->flags = nfss->flags; | |
1732 | data->rsize = nfss->rsize; | |
1733 | data->wsize = nfss->wsize; | |
1734 | data->retrans = nfss->client->cl_timeout->to_retries; | |
1735 | data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; | |
1736 | data->acregmin = nfss->acregmin / HZ; | |
1737 | data->acregmax = nfss->acregmax / HZ; | |
1738 | data->acdirmin = nfss->acdirmin / HZ; | |
1739 | data->acdirmax = nfss->acdirmax / HZ; | |
1740 | data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; | |
1741 | data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; | |
1742 | memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, | |
1743 | data->nfs_server.addrlen); | |
1744 | ||
1745 | /* overwrite those values with any that were specified */ | |
1746 | error = nfs_parse_mount_options((char *)options, data); | |
1747 | if (error < 0) | |
1748 | goto out; | |
1749 | ||
1750 | /* compare new mount options with old ones */ | |
1751 | error = nfs_compare_remount_data(nfss, data); | |
1752 | out: | |
1753 | kfree(data); | |
1754 | return error; | |
1755 | } | |
1756 | ||
f7b422b1 | 1757 | /* |
54ceac45 | 1758 | * Initialise the common bits of the superblock |
f7b422b1 | 1759 | */ |
54ceac45 | 1760 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 1761 | { |
54ceac45 | 1762 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 1763 | |
54ceac45 | 1764 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 1765 | |
54ceac45 DH |
1766 | /* We probably want something more informative here */ |
1767 | snprintf(sb->s_id, sizeof(sb->s_id), | |
1768 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 1769 | |
54ceac45 DH |
1770 | if (sb->s_blocksize == 0) |
1771 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
1772 | &sb->s_blocksize_bits); | |
f7b422b1 | 1773 | |
54ceac45 DH |
1774 | if (server->flags & NFS_MOUNT_NOAC) |
1775 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 1776 | |
54ceac45 | 1777 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
1778 | } |
1779 | ||
1780 | /* | |
54ceac45 | 1781 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 1782 | */ |
2283f8d6 TT |
1783 | static void nfs_fill_super(struct super_block *sb, |
1784 | struct nfs_parsed_mount_data *data) | |
f7b422b1 DH |
1785 | { |
1786 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 1787 | |
54ceac45 DH |
1788 | sb->s_blocksize_bits = 0; |
1789 | sb->s_blocksize = 0; | |
1790 | if (data->bsize) | |
1791 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 1792 | |
54ceac45 DH |
1793 | if (server->flags & NFS_MOUNT_VER3) { |
1794 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
1795 | * so ourselves when necessary. | |
1796 | */ | |
1797 | sb->s_flags |= MS_POSIXACL; | |
1798 | sb->s_time_gran = 1; | |
816724e6 | 1799 | } |
54ceac45 DH |
1800 | |
1801 | sb->s_op = &nfs_sops; | |
1802 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1803 | } |
1804 | ||
1805 | /* | |
54ceac45 | 1806 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 1807 | */ |
54ceac45 DH |
1808 | static void nfs_clone_super(struct super_block *sb, |
1809 | const struct super_block *old_sb) | |
f7b422b1 | 1810 | { |
54ceac45 DH |
1811 | struct nfs_server *server = NFS_SB(sb); |
1812 | ||
1813 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
1814 | sb->s_blocksize = old_sb->s_blocksize; | |
1815 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 1816 | |
f7b422b1 | 1817 | if (server->flags & NFS_MOUNT_VER3) { |
54ceac45 DH |
1818 | /* The VFS shouldn't apply the umask to mode bits. We will do |
1819 | * so ourselves when necessary. | |
f7b422b1 DH |
1820 | */ |
1821 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 1822 | sb->s_time_gran = 1; |
f7b422b1 DH |
1823 | } |
1824 | ||
54ceac45 DH |
1825 | sb->s_op = old_sb->s_op; |
1826 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1827 | } |
1828 | ||
275a5d24 TM |
1829 | #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) |
1830 | ||
1831 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) | |
1832 | { | |
1833 | const struct nfs_server *a = s->s_fs_info; | |
1834 | const struct rpc_clnt *clnt_a = a->client; | |
1835 | const struct rpc_clnt *clnt_b = b->client; | |
1836 | ||
1837 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
1838 | goto Ebusy; | |
1839 | if (a->nfs_client != b->nfs_client) | |
1840 | goto Ebusy; | |
1841 | if (a->flags != b->flags) | |
1842 | goto Ebusy; | |
1843 | if (a->wsize != b->wsize) | |
1844 | goto Ebusy; | |
1845 | if (a->rsize != b->rsize) | |
1846 | goto Ebusy; | |
1847 | if (a->acregmin != b->acregmin) | |
1848 | goto Ebusy; | |
1849 | if (a->acregmax != b->acregmax) | |
1850 | goto Ebusy; | |
1851 | if (a->acdirmin != b->acdirmin) | |
1852 | goto Ebusy; | |
1853 | if (a->acdirmax != b->acdirmax) | |
1854 | goto Ebusy; | |
1855 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
1856 | goto Ebusy; | |
e89a5a43 | 1857 | return 1; |
275a5d24 | 1858 | Ebusy: |
e89a5a43 TM |
1859 | return 0; |
1860 | } | |
1861 | ||
1862 | struct nfs_sb_mountdata { | |
1863 | struct nfs_server *server; | |
1864 | int mntflags; | |
1865 | }; | |
1866 | ||
1867 | static int nfs_set_super(struct super_block *s, void *data) | |
1868 | { | |
1869 | struct nfs_sb_mountdata *sb_mntdata = data; | |
1870 | struct nfs_server *server = sb_mntdata->server; | |
1871 | int ret; | |
1872 | ||
1873 | s->s_flags = sb_mntdata->mntflags; | |
1874 | s->s_fs_info = server; | |
1875 | ret = set_anon_super(s, server); | |
1876 | if (ret == 0) | |
1877 | server->s_dev = s->s_dev; | |
1878 | return ret; | |
1879 | } | |
1880 | ||
fd00a8ff CL |
1881 | static int nfs_compare_super_address(struct nfs_server *server1, |
1882 | struct nfs_server *server2) | |
1883 | { | |
1884 | struct sockaddr *sap1, *sap2; | |
1885 | ||
1886 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
1887 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
1888 | ||
1889 | if (sap1->sa_family != sap2->sa_family) | |
1890 | return 0; | |
1891 | ||
1892 | switch (sap1->sa_family) { | |
1893 | case AF_INET: { | |
1894 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
1895 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
1896 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
1897 | return 0; | |
1898 | if (sin1->sin_port != sin2->sin_port) | |
1899 | return 0; | |
1900 | break; | |
1901 | } | |
1902 | case AF_INET6: { | |
1903 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
1904 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
1905 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
1906 | return 0; | |
1907 | if (sin1->sin6_port != sin2->sin6_port) | |
1908 | return 0; | |
1909 | break; | |
1910 | } | |
1911 | default: | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | return 1; | |
1916 | } | |
1917 | ||
e89a5a43 TM |
1918 | static int nfs_compare_super(struct super_block *sb, void *data) |
1919 | { | |
1920 | struct nfs_sb_mountdata *sb_mntdata = data; | |
1921 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
1922 | int mntflags = sb_mntdata->mntflags; | |
1923 | ||
fd00a8ff | 1924 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
1925 | return 0; |
1926 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
1927 | if (old->flags & NFS_MOUNT_UNSHARED) | |
1928 | return 0; | |
1929 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
1930 | return 0; | |
1931 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
1932 | } |
1933 | ||
fa799759 MS |
1934 | static int nfs_bdi_register(struct nfs_server *server) |
1935 | { | |
1936 | return bdi_register_dev(&server->backing_dev_info, server->s_dev); | |
1937 | } | |
1938 | ||
816724e6 TM |
1939 | static int nfs_get_sb(struct file_system_type *fs_type, |
1940 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 1941 | { |
f7b422b1 DH |
1942 | struct nfs_server *server = NULL; |
1943 | struct super_block *s; | |
33852a1f TM |
1944 | struct nfs_parsed_mount_data *data; |
1945 | struct nfs_fh *mntfh; | |
54ceac45 | 1946 | struct dentry *mntroot; |
75180df2 | 1947 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1948 | struct nfs_sb_mountdata sb_mntdata = { |
1949 | .mntflags = flags, | |
1950 | }; | |
33852a1f TM |
1951 | int error = -ENOMEM; |
1952 | ||
1953 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1954 | mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); | |
1955 | if (data == NULL || mntfh == NULL) | |
1956 | goto out_free_fh; | |
f7b422b1 | 1957 | |
33852a1f | 1958 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 1959 | |
54ceac45 | 1960 | /* Validate the mount data */ |
33852a1f | 1961 | error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); |
54ceac45 | 1962 | if (error < 0) |
0655960f | 1963 | goto out; |
f7b422b1 | 1964 | |
54ceac45 | 1965 | /* Get a volume representation */ |
33852a1f | 1966 | server = nfs_create_server(data, mntfh); |
54ceac45 DH |
1967 | if (IS_ERR(server)) { |
1968 | error = PTR_ERR(server); | |
0655960f | 1969 | goto out; |
f7b422b1 | 1970 | } |
e89a5a43 | 1971 | sb_mntdata.server = server; |
f7b422b1 | 1972 | |
75180df2 TM |
1973 | if (server->flags & NFS_MOUNT_UNSHARED) |
1974 | compare_super = NULL; | |
1975 | ||
54ceac45 | 1976 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 1977 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
1978 | if (IS_ERR(s)) { |
1979 | error = PTR_ERR(s); | |
54ceac45 | 1980 | goto out_err_nosb; |
816724e6 TM |
1981 | } |
1982 | ||
54ceac45 DH |
1983 | if (s->s_fs_info != server) { |
1984 | nfs_free_server(server); | |
1985 | server = NULL; | |
fa799759 MS |
1986 | } else { |
1987 | error = nfs_bdi_register(server); | |
1988 | if (error) | |
1989 | goto error_splat_super; | |
54ceac45 | 1990 | } |
f7b422b1 | 1991 | |
54ceac45 DH |
1992 | if (!s->s_root) { |
1993 | /* initial superblock/root creation */ | |
33852a1f | 1994 | nfs_fill_super(s, data); |
54ceac45 | 1995 | } |
f7b422b1 | 1996 | |
33852a1f | 1997 | mntroot = nfs_get_root(s, mntfh); |
54ceac45 DH |
1998 | if (IS_ERR(mntroot)) { |
1999 | error = PTR_ERR(mntroot); | |
2000 | goto error_splat_super; | |
f7b422b1 | 2001 | } |
816724e6 | 2002 | |
33852a1f | 2003 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
f9c3a380 EP |
2004 | if (error) |
2005 | goto error_splat_root; | |
2006 | ||
54ceac45 DH |
2007 | s->s_flags |= MS_ACTIVE; |
2008 | mnt->mnt_sb = s; | |
2009 | mnt->mnt_root = mntroot; | |
0655960f CL |
2010 | error = 0; |
2011 | ||
2012 | out: | |
33852a1f TM |
2013 | kfree(data->nfs_server.hostname); |
2014 | kfree(data->mount_server.hostname); | |
2015 | security_free_mnt_opts(&data->lsm_opts); | |
2016 | out_free_fh: | |
2017 | kfree(mntfh); | |
2018 | kfree(data); | |
0655960f | 2019 | return error; |
816724e6 | 2020 | |
54ceac45 DH |
2021 | out_err_nosb: |
2022 | nfs_free_server(server); | |
0655960f | 2023 | goto out; |
54ceac45 | 2024 | |
f9c3a380 EP |
2025 | error_splat_root: |
2026 | dput(mntroot); | |
54ceac45 DH |
2027 | error_splat_super: |
2028 | up_write(&s->s_umount); | |
2029 | deactivate_super(s); | |
0655960f | 2030 | goto out; |
f7b422b1 DH |
2031 | } |
2032 | ||
54ceac45 DH |
2033 | /* |
2034 | * Destroy an NFS2/3 superblock | |
2035 | */ | |
f7b422b1 DH |
2036 | static void nfs_kill_super(struct super_block *s) |
2037 | { | |
2038 | struct nfs_server *server = NFS_SB(s); | |
2039 | ||
fa799759 | 2040 | bdi_unregister(&server->backing_dev_info); |
f7b422b1 | 2041 | kill_anon_super(s); |
54ceac45 | 2042 | nfs_free_server(server); |
f7b422b1 DH |
2043 | } |
2044 | ||
54ceac45 DH |
2045 | /* |
2046 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
2047 | */ | |
2048 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
2049 | const char *dev_name, void *raw_data, | |
2050 | struct vfsmount *mnt) | |
f7b422b1 DH |
2051 | { |
2052 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2053 | struct super_block *s; |
2054 | struct nfs_server *server; | |
2055 | struct dentry *mntroot; | |
75180df2 | 2056 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2057 | struct nfs_sb_mountdata sb_mntdata = { |
2058 | .mntflags = flags, | |
2059 | }; | |
54ceac45 | 2060 | int error; |
f7b422b1 | 2061 | |
54ceac45 | 2062 | dprintk("--> nfs_xdev_get_sb()\n"); |
f7b422b1 | 2063 | |
54ceac45 DH |
2064 | /* create a new volume representation */ |
2065 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2066 | if (IS_ERR(server)) { | |
2067 | error = PTR_ERR(server); | |
2068 | goto out_err_noserver; | |
2069 | } | |
e89a5a43 | 2070 | sb_mntdata.server = server; |
8fa5c000 | 2071 | |
75180df2 TM |
2072 | if (server->flags & NFS_MOUNT_UNSHARED) |
2073 | compare_super = NULL; | |
2074 | ||
54ceac45 | 2075 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2076 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2077 | if (IS_ERR(s)) { |
2078 | error = PTR_ERR(s); | |
2079 | goto out_err_nosb; | |
2080 | } | |
5006a76c | 2081 | |
54ceac45 DH |
2082 | if (s->s_fs_info != server) { |
2083 | nfs_free_server(server); | |
2084 | server = NULL; | |
fa799759 MS |
2085 | } else { |
2086 | error = nfs_bdi_register(server); | |
2087 | if (error) | |
2088 | goto error_splat_super; | |
f7b422b1 | 2089 | } |
24c8dbbb | 2090 | |
54ceac45 DH |
2091 | if (!s->s_root) { |
2092 | /* initial superblock/root creation */ | |
54ceac45 DH |
2093 | nfs_clone_super(s, data->sb); |
2094 | } | |
f7b422b1 | 2095 | |
54ceac45 DH |
2096 | mntroot = nfs_get_root(s, data->fh); |
2097 | if (IS_ERR(mntroot)) { | |
2098 | error = PTR_ERR(mntroot); | |
2099 | goto error_splat_super; | |
f7b422b1 | 2100 | } |
e9cc6c23 | 2101 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
4c1fe2f7 NB |
2102 | dput(mntroot); |
2103 | error = -ESTALE; | |
2104 | goto error_splat_super; | |
2105 | } | |
f7b422b1 | 2106 | |
54ceac45 DH |
2107 | s->s_flags |= MS_ACTIVE; |
2108 | mnt->mnt_sb = s; | |
2109 | mnt->mnt_root = mntroot; | |
f7b422b1 | 2110 | |
f9c3a380 EP |
2111 | /* clone any lsm security options from the parent to the new sb */ |
2112 | security_sb_clone_mnt_opts(data->sb, s); | |
2113 | ||
54ceac45 DH |
2114 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); |
2115 | return 0; | |
24c8dbbb | 2116 | |
54ceac45 DH |
2117 | out_err_nosb: |
2118 | nfs_free_server(server); | |
2119 | out_err_noserver: | |
2120 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
2121 | return error; | |
f7b422b1 | 2122 | |
54ceac45 DH |
2123 | error_splat_super: |
2124 | up_write(&s->s_umount); | |
2125 | deactivate_super(s); | |
2126 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
2127 | return error; | |
f7b422b1 DH |
2128 | } |
2129 | ||
54ceac45 DH |
2130 | #ifdef CONFIG_NFS_V4 |
2131 | ||
f7b422b1 | 2132 | /* |
54ceac45 | 2133 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 2134 | */ |
54ceac45 DH |
2135 | static void nfs4_clone_super(struct super_block *sb, |
2136 | const struct super_block *old_sb) | |
f7b422b1 | 2137 | { |
54ceac45 DH |
2138 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
2139 | sb->s_blocksize = old_sb->s_blocksize; | |
2140 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 2141 | sb->s_time_gran = 1; |
54ceac45 DH |
2142 | sb->s_op = old_sb->s_op; |
2143 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2144 | } |
2145 | ||
54ceac45 DH |
2146 | /* |
2147 | * Set up an NFS4 superblock | |
2148 | */ | |
2149 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 2150 | { |
54ceac45 DH |
2151 | sb->s_time_gran = 1; |
2152 | sb->s_op = &nfs4_sops; | |
2153 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
2154 | } |
2155 | ||
f0768ebd CL |
2156 | /* |
2157 | * Validate NFSv4 mount options | |
2158 | */ | |
91ea40b9 TT |
2159 | static int nfs4_validate_mount_data(void *options, |
2160 | struct nfs_parsed_mount_data *args, | |
2161 | const char *dev_name) | |
f0768ebd | 2162 | { |
4c568017 | 2163 | struct sockaddr_in *ap; |
91ea40b9 | 2164 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
2165 | char *c; |
2166 | ||
2167 | if (data == NULL) | |
2168 | goto out_no_data; | |
2169 | ||
91ea40b9 TT |
2170 | args->rsize = NFS_MAX_FILE_IO_SIZE; |
2171 | args->wsize = NFS_MAX_FILE_IO_SIZE; | |
0e0cab74 CL |
2172 | args->acregmin = NFS_DEF_ACREGMIN; |
2173 | args->acregmax = NFS_DEF_ACREGMAX; | |
2174 | args->acdirmin = NFS_DEF_ACDIRMIN; | |
2175 | args->acdirmax = NFS_DEF_ACDIRMAX; | |
f22d6d79 | 2176 | args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */ |
6738b251 CL |
2177 | args->auth_flavors[0] = RPC_AUTH_UNIX; |
2178 | args->auth_flavor_len = 0; | |
91ea40b9 | 2179 | |
f0768ebd CL |
2180 | switch (data->version) { |
2181 | case 1: | |
4c568017 CL |
2182 | ap = (struct sockaddr_in *)&args->nfs_server.address; |
2183 | if (data->host_addrlen > sizeof(args->nfs_server.address)) | |
2184 | goto out_no_address; | |
2185 | if (data->host_addrlen == 0) | |
f0768ebd | 2186 | goto out_no_address; |
4c568017 CL |
2187 | args->nfs_server.addrlen = data->host_addrlen; |
2188 | if (copy_from_user(ap, data->host_addr, data->host_addrlen)) | |
f0768ebd | 2189 | return -EFAULT; |
91ea40b9 TT |
2190 | if (!nfs_verify_server_address((struct sockaddr *) |
2191 | &args->nfs_server.address)) | |
f0768ebd CL |
2192 | goto out_no_address; |
2193 | ||
6738b251 CL |
2194 | if (data->auth_flavourlen) { |
2195 | if (data->auth_flavourlen > 1) | |
2196 | goto out_inval_auth; | |
20c71f5e | 2197 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 2198 | data->auth_flavours, |
20c71f5e | 2199 | sizeof(args->auth_flavors[0]))) |
f0768ebd | 2200 | return -EFAULT; |
f0768ebd CL |
2201 | } |
2202 | ||
2203 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
2204 | if (IS_ERR(c)) | |
2205 | return PTR_ERR(c); | |
91ea40b9 | 2206 | args->nfs_server.hostname = c; |
f0768ebd CL |
2207 | |
2208 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
2209 | if (IS_ERR(c)) | |
2210 | return PTR_ERR(c); | |
91ea40b9 TT |
2211 | args->nfs_server.export_path = c; |
2212 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
2213 | |
2214 | c = strndup_user(data->client_addr.data, 16); | |
2215 | if (IS_ERR(c)) | |
2216 | return PTR_ERR(c); | |
91ea40b9 TT |
2217 | args->client_address = c; |
2218 | ||
2219 | /* | |
2220 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
2221 | * can deal with. | |
2222 | */ | |
2223 | ||
2224 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
2225 | args->rsize = data->rsize; | |
2226 | args->wsize = data->wsize; | |
2227 | args->timeo = data->timeo; | |
2228 | args->retrans = data->retrans; | |
2229 | args->acregmin = data->acregmin; | |
2230 | args->acregmax = data->acregmax; | |
2231 | args->acdirmin = data->acdirmin; | |
2232 | args->acdirmax = data->acdirmax; | |
2233 | args->nfs_server.protocol = data->proto; | |
259875ef | 2234 | nfs_validate_transport_protocol(args); |
f0768ebd CL |
2235 | |
2236 | break; | |
80071225 | 2237 | default: { |
dc045898 | 2238 | int status; |
91ea40b9 TT |
2239 | |
2240 | if (nfs_parse_mount_options((char *)options, args) == 0) | |
80071225 CL |
2241 | return -EINVAL; |
2242 | ||
2243 | if (!nfs_verify_server_address((struct sockaddr *) | |
91ea40b9 | 2244 | &args->nfs_server.address)) |
80071225 | 2245 | return -EINVAL; |
80071225 | 2246 | |
ed596a8a CL |
2247 | nfs_set_port((struct sockaddr *)&args->nfs_server.address, |
2248 | args->nfs_server.port); | |
2249 | ||
259875ef TM |
2250 | nfs_validate_transport_protocol(args); |
2251 | ||
6738b251 | 2252 | if (args->auth_flavor_len > 1) |
80071225 | 2253 | goto out_inval_auth; |
80071225 | 2254 | |
91ea40b9 | 2255 | if (args->client_address == NULL) |
0a87cf12 JL |
2256 | goto out_no_client_address; |
2257 | ||
dc045898 CL |
2258 | status = nfs_parse_devname(dev_name, |
2259 | &args->nfs_server.hostname, | |
2260 | NFS4_MAXNAMLEN, | |
2261 | &args->nfs_server.export_path, | |
2262 | NFS4_MAXPATHLEN); | |
2263 | if (status < 0) | |
2264 | return status; | |
2265 | ||
80071225 CL |
2266 | break; |
2267 | } | |
f0768ebd CL |
2268 | } |
2269 | ||
2270 | return 0; | |
2271 | ||
2272 | out_no_data: | |
2273 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
2274 | return -EINVAL; | |
2275 | ||
2276 | out_inval_auth: | |
2277 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
2278 | data->auth_flavourlen); | |
2279 | return -EINVAL; | |
2280 | ||
2281 | out_no_address: | |
2282 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
2283 | return -EINVAL; | |
0a87cf12 JL |
2284 | |
2285 | out_no_client_address: | |
2286 | dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n"); | |
2287 | return -EINVAL; | |
f0768ebd CL |
2288 | } |
2289 | ||
54ceac45 DH |
2290 | /* |
2291 | * Get the superblock for an NFS4 mountpoint | |
2292 | */ | |
816724e6 TM |
2293 | static int nfs4_get_sb(struct file_system_type *fs_type, |
2294 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 2295 | { |
33852a1f | 2296 | struct nfs_parsed_mount_data *data; |
54ceac45 DH |
2297 | struct super_block *s; |
2298 | struct nfs_server *server; | |
33852a1f | 2299 | struct nfs_fh *mntfh; |
54ceac45 | 2300 | struct dentry *mntroot; |
75180df2 | 2301 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2302 | struct nfs_sb_mountdata sb_mntdata = { |
2303 | .mntflags = flags, | |
2304 | }; | |
33852a1f TM |
2305 | int error = -ENOMEM; |
2306 | ||
2307 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2308 | mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); | |
2309 | if (data == NULL || mntfh == NULL) | |
2310 | goto out_free_fh; | |
f7b422b1 | 2311 | |
33852a1f | 2312 | security_init_mnt_opts(&data->lsm_opts); |
f9c3a380 | 2313 | |
f0768ebd | 2314 | /* Validate the mount data */ |
33852a1f | 2315 | error = nfs4_validate_mount_data(raw_data, data, dev_name); |
f0768ebd CL |
2316 | if (error < 0) |
2317 | goto out; | |
f7b422b1 | 2318 | |
54ceac45 | 2319 | /* Get a volume representation */ |
33852a1f | 2320 | server = nfs4_create_server(data, mntfh); |
54ceac45 DH |
2321 | if (IS_ERR(server)) { |
2322 | error = PTR_ERR(server); | |
29eb981a | 2323 | goto out; |
f7b422b1 | 2324 | } |
e89a5a43 | 2325 | sb_mntdata.server = server; |
f7b422b1 | 2326 | |
75180df2 TM |
2327 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2328 | compare_super = NULL; | |
2329 | ||
54ceac45 | 2330 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2331 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
2332 | if (IS_ERR(s)) { |
2333 | error = PTR_ERR(s); | |
f7b422b1 | 2334 | goto out_free; |
816724e6 TM |
2335 | } |
2336 | ||
5dd3177a TM |
2337 | if (s->s_fs_info != server) { |
2338 | nfs_free_server(server); | |
2339 | server = NULL; | |
fa799759 MS |
2340 | } else { |
2341 | error = nfs_bdi_register(server); | |
2342 | if (error) | |
2343 | goto error_splat_super; | |
5dd3177a TM |
2344 | } |
2345 | ||
54ceac45 DH |
2346 | if (!s->s_root) { |
2347 | /* initial superblock/root creation */ | |
54ceac45 | 2348 | nfs4_fill_super(s); |
54ceac45 | 2349 | } |
f7b422b1 | 2350 | |
33852a1f | 2351 | mntroot = nfs4_get_root(s, mntfh); |
54ceac45 DH |
2352 | if (IS_ERR(mntroot)) { |
2353 | error = PTR_ERR(mntroot); | |
2354 | goto error_splat_super; | |
f7b422b1 | 2355 | } |
54ceac45 | 2356 | |
33852a1f | 2357 | error = security_sb_set_mnt_opts(s, &data->lsm_opts); |
46c8ac74 EP |
2358 | if (error) |
2359 | goto error_splat_root; | |
2360 | ||
f7b422b1 | 2361 | s->s_flags |= MS_ACTIVE; |
54ceac45 DH |
2362 | mnt->mnt_sb = s; |
2363 | mnt->mnt_root = mntroot; | |
29eb981a CL |
2364 | error = 0; |
2365 | ||
2366 | out: | |
33852a1f TM |
2367 | kfree(data->client_address); |
2368 | kfree(data->nfs_server.export_path); | |
2369 | kfree(data->nfs_server.hostname); | |
2370 | security_free_mnt_opts(&data->lsm_opts); | |
2371 | out_free_fh: | |
2372 | kfree(mntfh); | |
2373 | kfree(data); | |
29eb981a | 2374 | return error; |
54ceac45 | 2375 | |
f7b422b1 | 2376 | out_free: |
54ceac45 | 2377 | nfs_free_server(server); |
29eb981a | 2378 | goto out; |
54ceac45 | 2379 | |
46c8ac74 EP |
2380 | error_splat_root: |
2381 | dput(mntroot); | |
54ceac45 DH |
2382 | error_splat_super: |
2383 | up_write(&s->s_umount); | |
2384 | deactivate_super(s); | |
29eb981a | 2385 | goto out; |
f7b422b1 DH |
2386 | } |
2387 | ||
2388 | static void nfs4_kill_super(struct super_block *sb) | |
2389 | { | |
2390 | struct nfs_server *server = NFS_SB(sb); | |
2391 | ||
2392 | nfs_return_all_delegations(sb); | |
2393 | kill_anon_super(sb); | |
2394 | ||
2395 | nfs4_renewd_prepare_shutdown(server); | |
54ceac45 | 2396 | nfs_free_server(server); |
f7b422b1 DH |
2397 | } |
2398 | ||
2399 | /* | |
54ceac45 | 2400 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 2401 | */ |
54ceac45 DH |
2402 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, |
2403 | const char *dev_name, void *raw_data, | |
2404 | struct vfsmount *mnt) | |
f7b422b1 | 2405 | { |
54ceac45 DH |
2406 | struct nfs_clone_mount *data = raw_data; |
2407 | struct super_block *s; | |
2408 | struct nfs_server *server; | |
2409 | struct dentry *mntroot; | |
75180df2 | 2410 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2411 | struct nfs_sb_mountdata sb_mntdata = { |
2412 | .mntflags = flags, | |
2413 | }; | |
54ceac45 | 2414 | int error; |
f7b422b1 | 2415 | |
54ceac45 | 2416 | dprintk("--> nfs4_xdev_get_sb()\n"); |
f7b422b1 | 2417 | |
54ceac45 DH |
2418 | /* create a new volume representation */ |
2419 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
2420 | if (IS_ERR(server)) { | |
2421 | error = PTR_ERR(server); | |
2422 | goto out_err_noserver; | |
f7b422b1 | 2423 | } |
e89a5a43 | 2424 | sb_mntdata.server = server; |
f7b422b1 | 2425 | |
75180df2 TM |
2426 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2427 | compare_super = NULL; | |
2428 | ||
54ceac45 | 2429 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2430 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2431 | if (IS_ERR(s)) { |
2432 | error = PTR_ERR(s); | |
2433 | goto out_err_nosb; | |
f7b422b1 | 2434 | } |
f7b422b1 | 2435 | |
54ceac45 DH |
2436 | if (s->s_fs_info != server) { |
2437 | nfs_free_server(server); | |
2438 | server = NULL; | |
fa799759 MS |
2439 | } else { |
2440 | error = nfs_bdi_register(server); | |
2441 | if (error) | |
2442 | goto error_splat_super; | |
54ceac45 | 2443 | } |
f7b422b1 | 2444 | |
54ceac45 DH |
2445 | if (!s->s_root) { |
2446 | /* initial superblock/root creation */ | |
54ceac45 DH |
2447 | nfs4_clone_super(s, data->sb); |
2448 | } | |
f7b422b1 | 2449 | |
54ceac45 DH |
2450 | mntroot = nfs4_get_root(s, data->fh); |
2451 | if (IS_ERR(mntroot)) { | |
2452 | error = PTR_ERR(mntroot); | |
2453 | goto error_splat_super; | |
2454 | } | |
e9cc6c23 TM |
2455 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
2456 | dput(mntroot); | |
2457 | error = -ESTALE; | |
2458 | goto error_splat_super; | |
2459 | } | |
f7b422b1 | 2460 | |
54ceac45 DH |
2461 | s->s_flags |= MS_ACTIVE; |
2462 | mnt->mnt_sb = s; | |
2463 | mnt->mnt_root = mntroot; | |
2464 | ||
46c8ac74 EP |
2465 | security_sb_clone_mnt_opts(data->sb, s); |
2466 | ||
54ceac45 DH |
2467 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); |
2468 | return 0; | |
2469 | ||
2470 | out_err_nosb: | |
2471 | nfs_free_server(server); | |
2472 | out_err_noserver: | |
2473 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
2474 | return error; | |
2475 | ||
2476 | error_splat_super: | |
2477 | up_write(&s->s_umount); | |
2478 | deactivate_super(s); | |
2479 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
2480 | return error; | |
f7b422b1 DH |
2481 | } |
2482 | ||
54ceac45 DH |
2483 | /* |
2484 | * Create an NFS4 server record on referral traversal | |
2485 | */ | |
2486 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
2487 | const char *dev_name, void *raw_data, | |
2488 | struct vfsmount *mnt) | |
f7b422b1 DH |
2489 | { |
2490 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
2491 | struct super_block *s; |
2492 | struct nfs_server *server; | |
2493 | struct dentry *mntroot; | |
2494 | struct nfs_fh mntfh; | |
75180df2 | 2495 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
2496 | struct nfs_sb_mountdata sb_mntdata = { |
2497 | .mntflags = flags, | |
2498 | }; | |
54ceac45 DH |
2499 | int error; |
2500 | ||
2501 | dprintk("--> nfs4_referral_get_sb()\n"); | |
2502 | ||
2503 | /* create a new volume representation */ | |
2504 | server = nfs4_create_referral_server(data, &mntfh); | |
2505 | if (IS_ERR(server)) { | |
2506 | error = PTR_ERR(server); | |
2507 | goto out_err_noserver; | |
2508 | } | |
e89a5a43 | 2509 | sb_mntdata.server = server; |
54ceac45 | 2510 | |
75180df2 TM |
2511 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2512 | compare_super = NULL; | |
2513 | ||
54ceac45 | 2514 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2515 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2516 | if (IS_ERR(s)) { |
2517 | error = PTR_ERR(s); | |
2518 | goto out_err_nosb; | |
2519 | } | |
2520 | ||
2521 | if (s->s_fs_info != server) { | |
2522 | nfs_free_server(server); | |
2523 | server = NULL; | |
fa799759 MS |
2524 | } else { |
2525 | error = nfs_bdi_register(server); | |
2526 | if (error) | |
2527 | goto error_splat_super; | |
54ceac45 DH |
2528 | } |
2529 | ||
2530 | if (!s->s_root) { | |
2531 | /* initial superblock/root creation */ | |
54ceac45 DH |
2532 | nfs4_fill_super(s); |
2533 | } | |
2534 | ||
f2d0d85e | 2535 | mntroot = nfs4_get_root(s, &mntfh); |
54ceac45 DH |
2536 | if (IS_ERR(mntroot)) { |
2537 | error = PTR_ERR(mntroot); | |
2538 | goto error_splat_super; | |
2539 | } | |
e9cc6c23 TM |
2540 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
2541 | dput(mntroot); | |
2542 | error = -ESTALE; | |
2543 | goto error_splat_super; | |
2544 | } | |
54ceac45 DH |
2545 | |
2546 | s->s_flags |= MS_ACTIVE; | |
2547 | mnt->mnt_sb = s; | |
2548 | mnt->mnt_root = mntroot; | |
2549 | ||
46c8ac74 EP |
2550 | security_sb_clone_mnt_opts(data->sb, s); |
2551 | ||
54ceac45 DH |
2552 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); |
2553 | return 0; | |
2554 | ||
2555 | out_err_nosb: | |
2556 | nfs_free_server(server); | |
2557 | out_err_noserver: | |
2558 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
2559 | return error; | |
2560 | ||
2561 | error_splat_super: | |
2562 | up_write(&s->s_umount); | |
2563 | deactivate_super(s); | |
2564 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
2565 | return error; | |
f7b422b1 DH |
2566 | } |
2567 | ||
54ceac45 | 2568 | #endif /* CONFIG_NFS_V4 */ |