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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * NFS server file handle treatment. |
4 | * | |
5 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
6 | * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> | |
7 | * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 | |
8 | * ... and again Southern-Winter 2001 to support export_operations | |
9 | */ | |
10 | ||
a5694255 | 11 | #include <linux/exportfs.h> |
1da177e4 | 12 | |
32c1eb0c | 13 | #include <linux/sunrpc/svcauth_gss.h> |
9a74af21 | 14 | #include "nfsd.h" |
0a3adade | 15 | #include "vfs.h" |
2e8138a2 | 16 | #include "auth.h" |
1da177e4 LT |
17 | |
18 | #define NFSDDBG_FACILITY NFSDDBG_FH | |
1da177e4 LT |
19 | |
20 | ||
1da177e4 LT |
21 | /* |
22 | * our acceptability function. | |
23 | * if NOSUBTREECHECK, accept anything | |
24 | * if not, require that we can walk up to exp->ex_dentry | |
25 | * doing some checks on the 'x' bits | |
26 | */ | |
27 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
28 | { | |
29 | struct svc_export *exp = expv; | |
30 | int rv; | |
31 | struct dentry *tdentry; | |
32 | struct dentry *parent; | |
33 | ||
34 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
35 | return 1; | |
36 | ||
37 | tdentry = dget(dentry); | |
54775491 | 38 | while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { |
1da177e4 LT |
39 | /* make sure parents give x permission to user */ |
40 | int err; | |
41 | parent = dget_parent(tdentry); | |
2b0143b5 | 42 | err = inode_permission(d_inode(parent), MAY_EXEC); |
1da177e4 LT |
43 | if (err < 0) { |
44 | dput(parent); | |
45 | break; | |
46 | } | |
47 | dput(tdentry); | |
48 | tdentry = parent; | |
49 | } | |
54775491 | 50 | if (tdentry != exp->ex_path.dentry) |
97e47fa1 | 51 | dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry); |
54775491 | 52 | rv = (tdentry == exp->ex_path.dentry); |
1da177e4 LT |
53 | dput(tdentry); |
54 | return rv; | |
55 | } | |
56 | ||
57 | /* Type check. The correct error return for type mismatches does not seem to be | |
58 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
59 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
60 | * the write call). | |
61 | */ | |
83b11340 | 62 | static inline __be32 |
e75b23f9 BF |
63 | nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry, |
64 | umode_t requested) | |
1da177e4 | 65 | { |
e75b23f9 | 66 | umode_t mode = d_inode(dentry)->i_mode & S_IFMT; |
e10f9e14 BF |
67 | |
68 | if (requested == 0) /* the caller doesn't care */ | |
69 | return nfs_ok; | |
e75b23f9 BF |
70 | if (mode == requested) { |
71 | if (mode == S_IFDIR && !d_can_lookup(dentry)) { | |
72 | WARN_ON_ONCE(1); | |
73 | return nfserr_notdir; | |
74 | } | |
e10f9e14 | 75 | return nfs_ok; |
e75b23f9 | 76 | } |
e10f9e14 BF |
77 | /* |
78 | * v4 has an error more specific than err_notdir which we should | |
79 | * return in preference to err_notdir: | |
80 | */ | |
81 | if (rqstp->rq_vers == 4 && mode == S_IFLNK) | |
82 | return nfserr_symlink; | |
83 | if (requested == S_IFDIR) | |
84 | return nfserr_notdir; | |
85 | if (mode == S_IFDIR) | |
86 | return nfserr_isdir; | |
87 | return nfserr_inval; | |
1da177e4 LT |
88 | } |
89 | ||
6fa02839 BF |
90 | static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, |
91 | struct svc_export *exp) | |
92 | { | |
12045a6e BF |
93 | int flags = nfsexp_flags(rqstp, exp); |
94 | ||
6fa02839 | 95 | /* Check if the request originated from a secure port. */ |
4d152e2c | 96 | if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) { |
5216a8e7 | 97 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
a48fd0f9 KM |
98 | dprintk("nfsd: request from insecure port %s!\n", |
99 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
6fa02839 BF |
100 | return nfserr_perm; |
101 | } | |
102 | ||
103 | /* Set user creds for this exportpoint */ | |
104 | return nfserrno(nfsd_setuser(rqstp, exp)); | |
105 | } | |
106 | ||
03a816b4 SD |
107 | static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, |
108 | struct dentry *dentry, struct svc_export *exp) | |
109 | { | |
110 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) | |
111 | return nfs_ok; | |
112 | /* | |
113 | * v2/v3 clients have no need for the V4ROOT export--they use | |
114 | * the mount protocl instead; also, further V4ROOT checks may be | |
115 | * in v4-specific code, in which case v2/v3 clients could bypass | |
116 | * them. | |
117 | */ | |
118 | if (!nfsd_v4client(rqstp)) | |
119 | return nfserr_stale; | |
120 | /* | |
121 | * We're exposing only the directories and symlinks that have to be | |
122 | * traversed on the way to real exports: | |
123 | */ | |
e36cb0b8 DH |
124 | if (unlikely(!d_is_dir(dentry) && |
125 | !d_is_symlink(dentry))) | |
03a816b4 SD |
126 | return nfserr_stale; |
127 | /* | |
128 | * A pseudoroot export gives permission to access only one | |
129 | * single directory; the kernel has to make another upcall | |
130 | * before granting access to anything else under it: | |
131 | */ | |
132 | if (unlikely(dentry != exp->ex_path.dentry)) | |
133 | return nfserr_stale; | |
134 | return nfs_ok; | |
135 | } | |
136 | ||
03550fac BF |
137 | /* |
138 | * Use the given filehandle to look up the corresponding export and | |
139 | * dentry. On success, the results are used to set fh_export and | |
140 | * fh_dentry. | |
141 | */ | |
142 | static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
143 | { | |
144 | struct knfsd_fh *fh = &fhp->fh_handle; | |
145 | struct fid *fid = NULL, sfid; | |
146 | struct svc_export *exp; | |
147 | struct dentry *dentry; | |
148 | int fileid_type; | |
149 | int data_left = fh->fh_size/4; | |
150 | __be32 error; | |
151 | ||
152 | error = nfserr_stale; | |
153 | if (rqstp->rq_vers > 2) | |
154 | error = nfserr_badhandle; | |
155 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
156 | return nfserr_nofilehandle; | |
157 | ||
158 | if (fh->fh_version == 1) { | |
159 | int len; | |
160 | ||
161 | if (--data_left < 0) | |
162 | return error; | |
163 | if (fh->fh_auth_type != 0) | |
164 | return error; | |
165 | len = key_len(fh->fh_fsid_type) / 4; | |
166 | if (len == 0) | |
167 | return error; | |
168 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { | |
169 | /* deprecated, convert to type 3 */ | |
170 | len = key_len(FSID_ENCODE_DEV)/4; | |
171 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
94ec938b JL |
172 | /* |
173 | * struct knfsd_fh uses host-endian fields, which are | |
174 | * sometimes used to hold net-endian values. This | |
175 | * confuses sparse, so we must use __force here to | |
176 | * keep it from complaining. | |
177 | */ | |
178 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), | |
179 | ntohl((__force __be32)fh->fh_fsid[1]))); | |
03550fac BF |
180 | fh->fh_fsid[1] = fh->fh_fsid[2]; |
181 | } | |
182 | data_left -= len; | |
183 | if (data_left < 0) | |
184 | return error; | |
5409e46f CH |
185 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); |
186 | fid = (struct fid *)(fh->fh_fsid + len); | |
03550fac BF |
187 | } else { |
188 | __u32 tfh[2]; | |
189 | dev_t xdev; | |
190 | ino_t xino; | |
191 | ||
192 | if (fh->fh_size != NFS_FHSIZE) | |
193 | return error; | |
194 | /* assume old filehandle format */ | |
195 | xdev = old_decode_dev(fh->ofh_xdev); | |
196 | xino = u32_to_ino_t(fh->ofh_xino); | |
197 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); | |
198 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); | |
199 | } | |
200 | ||
201 | error = nfserr_stale; | |
202 | if (PTR_ERR(exp) == -ENOENT) | |
203 | return error; | |
204 | ||
205 | if (IS_ERR(exp)) | |
206 | return nfserrno(PTR_ERR(exp)); | |
207 | ||
496d6c32 NB |
208 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
209 | /* Elevate privileges so that the lack of 'r' or 'x' | |
210 | * permission on some parent directory will | |
211 | * not stop exportfs_decode_fh from being able | |
212 | * to reconnect a directory into the dentry cache. | |
213 | * The same problem can affect "SUBTREECHECK" exports, | |
214 | * but as nfsd_acceptable depends on correct | |
215 | * access control settings being in effect, we cannot | |
216 | * fix that case easily. | |
217 | */ | |
d84f4f99 | 218 | struct cred *new = prepare_creds(); |
027bc41a KM |
219 | if (!new) { |
220 | error = nfserrno(-ENOMEM); | |
221 | goto out; | |
222 | } | |
d84f4f99 DH |
223 | new->cap_effective = |
224 | cap_raise_nfsd_set(new->cap_effective, | |
225 | new->cap_permitted); | |
226 | put_cred(override_creds(new)); | |
227 | put_cred(new); | |
496d6c32 NB |
228 | } else { |
229 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
230 | if (error) | |
231 | goto out; | |
232 | } | |
03550fac BF |
233 | |
234 | /* | |
235 | * Look up the dentry using the NFS file handle. | |
236 | */ | |
237 | error = nfserr_stale; | |
238 | if (rqstp->rq_vers > 2) | |
239 | error = nfserr_badhandle; | |
240 | ||
241 | if (fh->fh_version != 1) { | |
242 | sfid.i32.ino = fh->ofh_ino; | |
243 | sfid.i32.gen = fh->ofh_generation; | |
244 | sfid.i32.parent_ino = fh->ofh_dirino; | |
245 | fid = &sfid; | |
246 | data_left = 3; | |
247 | if (fh->ofh_dirino == 0) | |
248 | fileid_type = FILEID_INO32_GEN; | |
249 | else | |
250 | fileid_type = FILEID_INO32_GEN_PARENT; | |
251 | } else | |
252 | fileid_type = fh->fh_fileid_type; | |
253 | ||
254 | if (fileid_type == FILEID_ROOT) | |
255 | dentry = dget(exp->ex_path.dentry); | |
256 | else { | |
257 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, | |
258 | data_left, fileid_type, | |
259 | nfsd_acceptable, exp); | |
260 | } | |
261 | if (dentry == NULL) | |
262 | goto out; | |
263 | if (IS_ERR(dentry)) { | |
264 | if (PTR_ERR(dentry) != -EINVAL) | |
265 | error = nfserrno(PTR_ERR(dentry)); | |
266 | goto out; | |
267 | } | |
268 | ||
e36cb0b8 | 269 | if (d_is_dir(dentry) && |
03550fac | 270 | (dentry->d_flags & DCACHE_DISCONNECTED)) { |
97e47fa1 AV |
271 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", |
272 | dentry); | |
03550fac BF |
273 | } |
274 | ||
275 | fhp->fh_dentry = dentry; | |
276 | fhp->fh_export = exp; | |
03550fac BF |
277 | return 0; |
278 | out: | |
279 | exp_put(exp); | |
280 | return error; | |
281 | } | |
282 | ||
b3d47676 BF |
283 | /** |
284 | * fh_verify - filehandle lookup and access checking | |
285 | * @rqstp: pointer to current rpc request | |
286 | * @fhp: filehandle to be verified | |
287 | * @type: expected type of object pointed to by filehandle | |
288 | * @access: type of access needed to object | |
289 | * | |
290 | * Look up a dentry from the on-the-wire filehandle, check the client's | |
291 | * access to the export, and set the current task's credentials. | |
292 | * | |
293 | * Regardless of success or failure of fh_verify(), fh_put() should be | |
294 | * called on @fhp when the caller is finished with the filehandle. | |
295 | * | |
296 | * fh_verify() may be called multiple times on a given filehandle, for | |
297 | * example, when processing an NFSv4 compound. The first call will look | |
298 | * up a dentry using the on-the-wire filehandle. Subsequent calls will | |
299 | * skip the lookup and just perform the other checks and possibly change | |
300 | * the current task's credentials. | |
1da177e4 | 301 | * |
b3d47676 BF |
302 | * @type specifies the type of object expected using one of the S_IF* |
303 | * constants defined in include/linux/stat.h. The caller may use zero | |
304 | * to indicate that it doesn't care, or a negative integer to indicate | |
305 | * that it expects something not of the given type. | |
1da177e4 | 306 | * |
b3d47676 | 307 | * @access is formed from the NFSD_MAY_* constants defined in |
93f580a9 | 308 | * fs/nfsd/vfs.h. |
1da177e4 | 309 | */ |
83b11340 | 310 | __be32 |
175a4eb7 | 311 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) |
1da177e4 | 312 | { |
03550fac | 313 | struct svc_export *exp; |
1da177e4 | 314 | struct dentry *dentry; |
03550fac | 315 | __be32 error; |
1da177e4 LT |
316 | |
317 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
318 | ||
1da177e4 | 319 | if (!fhp->fh_dentry) { |
03550fac | 320 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
321 | if (error) |
322 | goto out; | |
1da177e4 | 323 | } |
864f0f61 BF |
324 | dentry = fhp->fh_dentry; |
325 | exp = fhp->fh_export; | |
326 | /* | |
327 | * We still have to do all these permission checks, even when | |
328 | * fh_dentry is already set: | |
329 | * - fh_verify may be called multiple times with different | |
330 | * "access" arguments (e.g. nfsd_proc_create calls | |
331 | * fh_verify(...,NFSD_MAY_EXEC) first, then later (in | |
332 | * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). | |
333 | * - in the NFSv4 case, the filehandle may have been filled | |
334 | * in by fh_compose, and given a dentry, but further | |
335 | * compound operations performed with that filehandle | |
336 | * still need permissions checks. In the worst case, a | |
337 | * mountpoint crossing may have changed the export | |
338 | * options, and we may now need to use a different uid | |
339 | * (for example, if different id-squashing options are in | |
340 | * effect on the new filesystem). | |
341 | */ | |
03a816b4 SD |
342 | error = check_pseudo_root(rqstp, dentry, exp); |
343 | if (error) | |
344 | goto out; | |
345 | ||
864f0f61 BF |
346 | error = nfsd_setuser_and_check_port(rqstp, exp); |
347 | if (error) | |
348 | goto out; | |
7fc90ec9 | 349 | |
e75b23f9 | 350 | error = nfsd_mode_check(rqstp, dentry, type); |
1da177e4 LT |
351 | if (error) |
352 | goto out; | |
353 | ||
04716e66 BF |
354 | /* |
355 | * pseudoflavor restrictions are not enforced on NLM, | |
356 | * which clients virtually always use auth_sys for, | |
357 | * even while using RPCSEC_GSS for NFS. | |
358 | */ | |
204f4ce7 | 359 | if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) |
04716e66 BF |
360 | goto skip_pseudoflavor_check; |
361 | /* | |
362 | * Clients may expect to be able to use auth_sys during mount, | |
363 | * even if they use gss for everything else; see section 2.3.2 | |
364 | * of rfc 2623. | |
365 | */ | |
366 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
367 | && exp->ex_path.dentry == dentry) | |
368 | goto skip_pseudoflavor_check; | |
369 | ||
370 | error = check_nfsd_access(exp, rqstp); | |
371 | if (error) | |
372 | goto out; | |
32c1eb0c | 373 | |
04716e66 | 374 | skip_pseudoflavor_check: |
1da177e4 | 375 | /* Finally, check access permissions. */ |
0ec757df | 376 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 377 | |
1da177e4 | 378 | if (error) { |
97e47fa1 | 379 | dprintk("fh_verify: %pd2 permission failure, " |
34e9a63b | 380 | "acc=%x, error=%d\n", |
97e47fa1 | 381 | dentry, |
fc2dd2e5 | 382 | access, ntohl(error)); |
1da177e4 | 383 | } |
1da177e4 | 384 | out: |
1da177e4 LT |
385 | if (error == nfserr_stale) |
386 | nfsdstats.fh_stale++; | |
387 | return error; | |
388 | } | |
389 | ||
390 | ||
391 | /* | |
392 | * Compose a file handle for an NFS reply. | |
393 | * | |
394 | * Note that when first composed, the dentry may not yet have | |
395 | * an inode. In this case a call to fh_update should be made | |
396 | * before the fh goes out on the wire ... | |
397 | */ | |
6e91ea2b CH |
398 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
399 | struct dentry *dentry) | |
1da177e4 | 400 | { |
54775491 | 401 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b | 402 | struct fid *fid = (struct fid *) |
5409e46f | 403 | (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); |
6e91ea2b CH |
404 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; |
405 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 406 | |
6e91ea2b CH |
407 | fhp->fh_handle.fh_fileid_type = |
408 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
409 | fhp->fh_handle.fh_size += maxsize * 4; | |
410 | } else { | |
411 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
412 | } | |
1da177e4 LT |
413 | } |
414 | ||
415 | /* | |
416 | * for composing old style file handles | |
417 | */ | |
418 | static inline void _fh_update_old(struct dentry *dentry, | |
419 | struct svc_export *exp, | |
420 | struct knfsd_fh *fh) | |
421 | { | |
2b0143b5 DH |
422 | fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); |
423 | fh->ofh_generation = d_inode(dentry)->i_generation; | |
e36cb0b8 | 424 | if (d_is_dir(dentry) || |
1da177e4 LT |
425 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) |
426 | fh->ofh_dirino = 0; | |
427 | } | |
428 | ||
8e498751 BF |
429 | static bool is_root_export(struct svc_export *exp) |
430 | { | |
431 | return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; | |
432 | } | |
433 | ||
434 | static struct super_block *exp_sb(struct svc_export *exp) | |
435 | { | |
fc64005c | 436 | return exp->ex_path.dentry->d_sb; |
8e498751 BF |
437 | } |
438 | ||
439 | static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) | |
440 | { | |
441 | switch (fsid_type) { | |
442 | case FSID_DEV: | |
443 | if (!old_valid_dev(exp_sb(exp)->s_dev)) | |
444 | return 0; | |
445 | /* FALL THROUGH */ | |
446 | case FSID_MAJOR_MINOR: | |
447 | case FSID_ENCODE_DEV: | |
448 | return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; | |
449 | case FSID_NUM: | |
450 | return exp->ex_flags & NFSEXP_FSID; | |
451 | case FSID_UUID8: | |
452 | case FSID_UUID16: | |
453 | if (!is_root_export(exp)) | |
454 | return 0; | |
455 | /* fall through */ | |
456 | case FSID_UUID4_INUM: | |
457 | case FSID_UUID16_INUM: | |
458 | return exp->ex_uuid != NULL; | |
459 | } | |
460 | return 1; | |
461 | } | |
462 | ||
1da177e4 | 463 | |
bc6c53d5 BF |
464 | static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) |
465 | { | |
b41eeef1 | 466 | u8 version; |
bc6c53d5 BF |
467 | u8 fsid_type; |
468 | retry: | |
b41eeef1 | 469 | version = 1; |
7e405364 | 470 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 471 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
472 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
473 | ||
b41eeef1 N |
474 | ref_fh = NULL; |
475 | ||
476 | switch (version) { | |
477 | case 0xca: | |
af6a4e28 | 478 | fsid_type = FSID_DEV; |
b41eeef1 N |
479 | break; |
480 | case 1: | |
481 | break; | |
482 | default: | |
483 | goto retry; | |
484 | } | |
485 | ||
8e498751 BF |
486 | /* |
487 | * As the fsid -> filesystem mapping was guided by | |
488 | * user-space, there is no guarantee that the filesystem | |
489 | * actually supports that fsid type. If it doesn't we | |
490 | * loop around again without ref_fh set. | |
982aedfd | 491 | */ |
8e498751 BF |
492 | if (!fsid_type_ok_for_exp(fsid_type, exp)) |
493 | goto retry; | |
30fa8c01 SD |
494 | } else if (exp->ex_flags & NFSEXP_FSID) { |
495 | fsid_type = FSID_NUM; | |
af6a4e28 N |
496 | } else if (exp->ex_uuid) { |
497 | if (fhp->fh_maxsize >= 64) { | |
8e498751 | 498 | if (is_root_export(exp)) |
af6a4e28 N |
499 | fsid_type = FSID_UUID16; |
500 | else | |
501 | fsid_type = FSID_UUID16_INUM; | |
502 | } else { | |
8e498751 | 503 | if (is_root_export(exp)) |
af6a4e28 N |
504 | fsid_type = FSID_UUID8; |
505 | else | |
506 | fsid_type = FSID_UUID4_INUM; | |
507 | } | |
bc6c53d5 | 508 | } else if (!old_valid_dev(exp_sb(exp)->s_dev)) |
1da177e4 | 509 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 510 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 511 | else |
af6a4e28 | 512 | fsid_type = FSID_DEV; |
bc6c53d5 BF |
513 | fhp->fh_handle.fh_version = version; |
514 | if (version) | |
515 | fhp->fh_handle.fh_fsid_type = fsid_type; | |
516 | } | |
517 | ||
518 | __be32 | |
519 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, | |
520 | struct svc_fh *ref_fh) | |
521 | { | |
522 | /* ref_fh is a reference file handle. | |
523 | * if it is non-null and for the same filesystem, then we should compose | |
524 | * a filehandle which is of the same version, where possible. | |
525 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca | |
526 | * Then create a 32byte filehandle using nfs_fhbase_old | |
527 | * | |
528 | */ | |
529 | ||
2b0143b5 | 530 | struct inode * inode = d_inode(dentry); |
bc6c53d5 BF |
531 | dev_t ex_dev = exp_sb(exp)->s_dev; |
532 | ||
97e47fa1 | 533 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", |
bc6c53d5 | 534 | MAJOR(ex_dev), MINOR(ex_dev), |
2b0143b5 | 535 | (long) d_inode(exp->ex_path.dentry)->i_ino, |
97e47fa1 | 536 | dentry, |
bc6c53d5 BF |
537 | (inode ? inode->i_ino : 0)); |
538 | ||
539 | /* Choose filehandle version and fsid type based on | |
540 | * the reference filehandle (if it is in the same export) | |
541 | * or the export options. | |
542 | */ | |
d28c442f | 543 | set_version_and_fsid_type(fhp, exp, ref_fh); |
1da177e4 LT |
544 | |
545 | if (ref_fh == fhp) | |
546 | fh_put(ref_fh); | |
547 | ||
548 | if (fhp->fh_locked || fhp->fh_dentry) { | |
97e47fa1 AV |
549 | printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", |
550 | dentry); | |
1da177e4 LT |
551 | } |
552 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
97e47fa1 | 553 | printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", |
982aedfd | 554 | fhp->fh_maxsize, |
97e47fa1 | 555 | dentry); |
1da177e4 LT |
556 | |
557 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
bf18f163 | 558 | fhp->fh_export = exp_get(exp); |
1da177e4 | 559 | |
bc6c53d5 | 560 | if (fhp->fh_handle.fh_version == 0xca) { |
1da177e4 LT |
561 | /* old style filehandle please */ |
562 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
563 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
564 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
565 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
566 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 567 | fhp->fh_handle.ofh_xino = |
2b0143b5 | 568 | ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); |
1da177e4 LT |
569 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
570 | if (inode) | |
571 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
572 | } else { | |
5409e46f CH |
573 | fhp->fh_handle.fh_size = |
574 | key_len(fhp->fh_handle.fh_fsid_type) + 4; | |
1da177e4 | 575 | fhp->fh_handle.fh_auth_type = 0; |
5409e46f CH |
576 | |
577 | mk_fsid(fhp->fh_handle.fh_fsid_type, | |
578 | fhp->fh_handle.fh_fsid, | |
579 | ex_dev, | |
2b0143b5 | 580 | d_inode(exp->ex_path.dentry)->i_ino, |
af6a4e28 N |
581 | exp->ex_fsid, exp->ex_uuid); |
582 | ||
6e91ea2b CH |
583 | if (inode) |
584 | _fh_update(fhp, exp, dentry); | |
216b6cbd | 585 | if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { |
1be10a88 | 586 | fh_put(fhp); |
1da177e4 | 587 | return nfserr_opnotsupp; |
1be10a88 | 588 | } |
1da177e4 LT |
589 | } |
590 | ||
1da177e4 LT |
591 | return 0; |
592 | } | |
593 | ||
594 | /* | |
595 | * Update file handle information after changing a dentry. | |
596 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
597 | */ | |
83b11340 | 598 | __be32 |
1da177e4 LT |
599 | fh_update(struct svc_fh *fhp) |
600 | { | |
601 | struct dentry *dentry; | |
982aedfd | 602 | |
1da177e4 LT |
603 | if (!fhp->fh_dentry) |
604 | goto out_bad; | |
605 | ||
606 | dentry = fhp->fh_dentry; | |
2b0143b5 | 607 | if (d_really_is_negative(dentry)) |
1da177e4 LT |
608 | goto out_negative; |
609 | if (fhp->fh_handle.fh_version != 1) { | |
610 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
611 | } else { | |
6e91ea2b | 612 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
49e73720 | 613 | return 0; |
6e91ea2b CH |
614 | |
615 | _fh_update(fhp, fhp->fh_export, dentry); | |
216b6cbd | 616 | if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) |
1da177e4 LT |
617 | return nfserr_opnotsupp; |
618 | } | |
1da177e4 | 619 | return 0; |
1da177e4 LT |
620 | out_bad: |
621 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
49e73720 | 622 | return nfserr_serverfault; |
1da177e4 | 623 | out_negative: |
97e47fa1 AV |
624 | printk(KERN_ERR "fh_update: %pd2 still negative!\n", |
625 | dentry); | |
49e73720 | 626 | return nfserr_serverfault; |
1da177e4 LT |
627 | } |
628 | ||
629 | /* | |
630 | * Release a file handle. | |
631 | */ | |
632 | void | |
633 | fh_put(struct svc_fh *fhp) | |
634 | { | |
635 | struct dentry * dentry = fhp->fh_dentry; | |
636 | struct svc_export * exp = fhp->fh_export; | |
637 | if (dentry) { | |
638 | fh_unlock(fhp); | |
639 | fhp->fh_dentry = NULL; | |
640 | dput(dentry); | |
aaf91ec1 | 641 | fh_clear_wcc(fhp); |
1da177e4 | 642 | } |
4a55c101 | 643 | fh_drop_write(fhp); |
1da177e4 | 644 | if (exp) { |
a09581f2 | 645 | exp_put(exp); |
1da177e4 LT |
646 | fhp->fh_export = NULL; |
647 | } | |
648 | return; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Shorthand for dprintk()'s | |
653 | */ | |
654 | char * SVCFH_fmt(struct svc_fh *fhp) | |
655 | { | |
656 | struct knfsd_fh *fh = &fhp->fh_handle; | |
657 | ||
658 | static char buf[80]; | |
659 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
660 | fh->fh_size, | |
661 | fh->fh_base.fh_pad[0], | |
662 | fh->fh_base.fh_pad[1], | |
663 | fh->fh_base.fh_pad[2], | |
664 | fh->fh_base.fh_pad[3], | |
665 | fh->fh_base.fh_pad[4], | |
666 | fh->fh_base.fh_pad[5]); | |
667 | return buf; | |
668 | } | |
af6a4e28 N |
669 | |
670 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
671 | { | |
672 | if (fhp->fh_handle.fh_version != 1) | |
673 | return FSIDSOURCE_DEV; | |
674 | switch(fhp->fh_handle.fh_fsid_type) { | |
675 | case FSID_DEV: | |
676 | case FSID_ENCODE_DEV: | |
677 | case FSID_MAJOR_MINOR: | |
8e498751 | 678 | if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) |
b8da0d1c NB |
679 | return FSIDSOURCE_DEV; |
680 | break; | |
af6a4e28 | 681 | case FSID_NUM: |
af6a4e28 N |
682 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
683 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
684 | break; |
685 | default: | |
686 | break; | |
af6a4e28 | 687 | } |
b8da0d1c NB |
688 | /* either a UUID type filehandle, or the filehandle doesn't |
689 | * match the export. | |
690 | */ | |
691 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
692 | return FSIDSOURCE_FSID; | |
693 | if (fhp->fh_export->ex_uuid) | |
694 | return FSIDSOURCE_UUID; | |
695 | return FSIDSOURCE_DEV; | |
af6a4e28 | 696 | } |