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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * NFS server file handle treatment. |
3 | * | |
4 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
5 | * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> | |
6 | * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 | |
7 | * ... and again Southern-Winter 2001 to support export_operations | |
8 | */ | |
9 | ||
a5694255 | 10 | #include <linux/exportfs.h> |
1da177e4 | 11 | |
32c1eb0c | 12 | #include <linux/sunrpc/svcauth_gss.h> |
9a74af21 | 13 | #include "nfsd.h" |
0a3adade | 14 | #include "vfs.h" |
2e8138a2 | 15 | #include "auth.h" |
1da177e4 LT |
16 | |
17 | #define NFSDDBG_FACILITY NFSDDBG_FH | |
1da177e4 LT |
18 | |
19 | ||
1da177e4 LT |
20 | /* |
21 | * our acceptability function. | |
22 | * if NOSUBTREECHECK, accept anything | |
23 | * if not, require that we can walk up to exp->ex_dentry | |
24 | * doing some checks on the 'x' bits | |
25 | */ | |
26 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
27 | { | |
28 | struct svc_export *exp = expv; | |
29 | int rv; | |
30 | struct dentry *tdentry; | |
31 | struct dentry *parent; | |
32 | ||
33 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
34 | return 1; | |
35 | ||
36 | tdentry = dget(dentry); | |
54775491 | 37 | while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { |
1da177e4 LT |
38 | /* make sure parents give x permission to user */ |
39 | int err; | |
40 | parent = dget_parent(tdentry); | |
f419a2e3 | 41 | err = inode_permission(parent->d_inode, MAY_EXEC); |
1da177e4 LT |
42 | if (err < 0) { |
43 | dput(parent); | |
44 | break; | |
45 | } | |
46 | dput(tdentry); | |
47 | tdentry = parent; | |
48 | } | |
54775491 | 49 | if (tdentry != exp->ex_path.dentry) |
1da177e4 | 50 | dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); |
54775491 | 51 | rv = (tdentry == exp->ex_path.dentry); |
1da177e4 LT |
52 | dput(tdentry); |
53 | return rv; | |
54 | } | |
55 | ||
56 | /* Type check. The correct error return for type mismatches does not seem to be | |
57 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
58 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
59 | * the write call). | |
60 | */ | |
83b11340 | 61 | static inline __be32 |
1da177e4 LT |
62 | nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type) |
63 | { | |
64 | /* Type can be negative when creating hardlinks - not to a dir */ | |
65 | if (type > 0 && (mode & S_IFMT) != type) { | |
66 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
67 | return nfserr_symlink; | |
68 | else if (type == S_IFDIR) | |
69 | return nfserr_notdir; | |
70 | else if ((mode & S_IFMT) == S_IFDIR) | |
71 | return nfserr_isdir; | |
72 | else | |
73 | return nfserr_inval; | |
74 | } | |
75 | if (type < 0 && (mode & S_IFMT) == -type) { | |
76 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
77 | return nfserr_symlink; | |
78 | else if (type == -S_IFDIR) | |
79 | return nfserr_isdir; | |
80 | else | |
81 | return nfserr_notdir; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
6fa02839 BF |
86 | static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, |
87 | struct svc_export *exp) | |
88 | { | |
12045a6e BF |
89 | int flags = nfsexp_flags(rqstp, exp); |
90 | ||
6fa02839 | 91 | /* Check if the request originated from a secure port. */ |
3d354cbc | 92 | if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) { |
5216a8e7 | 93 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
6fa02839 BF |
94 | dprintk(KERN_WARNING |
95 | "nfsd: request from insecure port %s!\n", | |
96 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
97 | return nfserr_perm; | |
98 | } | |
99 | ||
100 | /* Set user creds for this exportpoint */ | |
101 | return nfserrno(nfsd_setuser(rqstp, exp)); | |
102 | } | |
103 | ||
03a816b4 SD |
104 | static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, |
105 | struct dentry *dentry, struct svc_export *exp) | |
106 | { | |
107 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) | |
108 | return nfs_ok; | |
109 | /* | |
110 | * v2/v3 clients have no need for the V4ROOT export--they use | |
111 | * the mount protocl instead; also, further V4ROOT checks may be | |
112 | * in v4-specific code, in which case v2/v3 clients could bypass | |
113 | * them. | |
114 | */ | |
115 | if (!nfsd_v4client(rqstp)) | |
116 | return nfserr_stale; | |
117 | /* | |
118 | * We're exposing only the directories and symlinks that have to be | |
119 | * traversed on the way to real exports: | |
120 | */ | |
121 | if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) && | |
122 | !S_ISLNK(dentry->d_inode->i_mode))) | |
123 | return nfserr_stale; | |
124 | /* | |
125 | * A pseudoroot export gives permission to access only one | |
126 | * single directory; the kernel has to make another upcall | |
127 | * before granting access to anything else under it: | |
128 | */ | |
129 | if (unlikely(dentry != exp->ex_path.dentry)) | |
130 | return nfserr_stale; | |
131 | return nfs_ok; | |
132 | } | |
133 | ||
03550fac BF |
134 | /* |
135 | * Use the given filehandle to look up the corresponding export and | |
136 | * dentry. On success, the results are used to set fh_export and | |
137 | * fh_dentry. | |
138 | */ | |
139 | static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
140 | { | |
141 | struct knfsd_fh *fh = &fhp->fh_handle; | |
142 | struct fid *fid = NULL, sfid; | |
143 | struct svc_export *exp; | |
144 | struct dentry *dentry; | |
145 | int fileid_type; | |
146 | int data_left = fh->fh_size/4; | |
147 | __be32 error; | |
148 | ||
149 | error = nfserr_stale; | |
150 | if (rqstp->rq_vers > 2) | |
151 | error = nfserr_badhandle; | |
152 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
153 | return nfserr_nofilehandle; | |
154 | ||
155 | if (fh->fh_version == 1) { | |
156 | int len; | |
157 | ||
158 | if (--data_left < 0) | |
159 | return error; | |
160 | if (fh->fh_auth_type != 0) | |
161 | return error; | |
162 | len = key_len(fh->fh_fsid_type) / 4; | |
163 | if (len == 0) | |
164 | return error; | |
165 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { | |
166 | /* deprecated, convert to type 3 */ | |
167 | len = key_len(FSID_ENCODE_DEV)/4; | |
168 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
169 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); | |
170 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
171 | } | |
172 | data_left -= len; | |
173 | if (data_left < 0) | |
174 | return error; | |
175 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth); | |
176 | fid = (struct fid *)(fh->fh_auth + len); | |
177 | } else { | |
178 | __u32 tfh[2]; | |
179 | dev_t xdev; | |
180 | ino_t xino; | |
181 | ||
182 | if (fh->fh_size != NFS_FHSIZE) | |
183 | return error; | |
184 | /* assume old filehandle format */ | |
185 | xdev = old_decode_dev(fh->ofh_xdev); | |
186 | xino = u32_to_ino_t(fh->ofh_xino); | |
187 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); | |
188 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); | |
189 | } | |
190 | ||
191 | error = nfserr_stale; | |
192 | if (PTR_ERR(exp) == -ENOENT) | |
193 | return error; | |
194 | ||
195 | if (IS_ERR(exp)) | |
196 | return nfserrno(PTR_ERR(exp)); | |
197 | ||
496d6c32 NB |
198 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
199 | /* Elevate privileges so that the lack of 'r' or 'x' | |
200 | * permission on some parent directory will | |
201 | * not stop exportfs_decode_fh from being able | |
202 | * to reconnect a directory into the dentry cache. | |
203 | * The same problem can affect "SUBTREECHECK" exports, | |
204 | * but as nfsd_acceptable depends on correct | |
205 | * access control settings being in effect, we cannot | |
206 | * fix that case easily. | |
207 | */ | |
d84f4f99 DH |
208 | struct cred *new = prepare_creds(); |
209 | if (!new) | |
210 | return nfserrno(-ENOMEM); | |
211 | new->cap_effective = | |
212 | cap_raise_nfsd_set(new->cap_effective, | |
213 | new->cap_permitted); | |
214 | put_cred(override_creds(new)); | |
215 | put_cred(new); | |
496d6c32 NB |
216 | } else { |
217 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
218 | if (error) | |
219 | goto out; | |
220 | } | |
03550fac BF |
221 | |
222 | /* | |
223 | * Look up the dentry using the NFS file handle. | |
224 | */ | |
225 | error = nfserr_stale; | |
226 | if (rqstp->rq_vers > 2) | |
227 | error = nfserr_badhandle; | |
228 | ||
229 | if (fh->fh_version != 1) { | |
230 | sfid.i32.ino = fh->ofh_ino; | |
231 | sfid.i32.gen = fh->ofh_generation; | |
232 | sfid.i32.parent_ino = fh->ofh_dirino; | |
233 | fid = &sfid; | |
234 | data_left = 3; | |
235 | if (fh->ofh_dirino == 0) | |
236 | fileid_type = FILEID_INO32_GEN; | |
237 | else | |
238 | fileid_type = FILEID_INO32_GEN_PARENT; | |
239 | } else | |
240 | fileid_type = fh->fh_fileid_type; | |
241 | ||
242 | if (fileid_type == FILEID_ROOT) | |
243 | dentry = dget(exp->ex_path.dentry); | |
244 | else { | |
245 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, | |
246 | data_left, fileid_type, | |
247 | nfsd_acceptable, exp); | |
248 | } | |
249 | if (dentry == NULL) | |
250 | goto out; | |
251 | if (IS_ERR(dentry)) { | |
252 | if (PTR_ERR(dentry) != -EINVAL) | |
253 | error = nfserrno(PTR_ERR(dentry)); | |
254 | goto out; | |
255 | } | |
256 | ||
257 | if (S_ISDIR(dentry->d_inode->i_mode) && | |
258 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
259 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
260 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
261 | } | |
262 | ||
263 | fhp->fh_dentry = dentry; | |
264 | fhp->fh_export = exp; | |
03550fac BF |
265 | return 0; |
266 | out: | |
267 | exp_put(exp); | |
268 | return error; | |
269 | } | |
270 | ||
b3d47676 BF |
271 | /** |
272 | * fh_verify - filehandle lookup and access checking | |
273 | * @rqstp: pointer to current rpc request | |
274 | * @fhp: filehandle to be verified | |
275 | * @type: expected type of object pointed to by filehandle | |
276 | * @access: type of access needed to object | |
277 | * | |
278 | * Look up a dentry from the on-the-wire filehandle, check the client's | |
279 | * access to the export, and set the current task's credentials. | |
280 | * | |
281 | * Regardless of success or failure of fh_verify(), fh_put() should be | |
282 | * called on @fhp when the caller is finished with the filehandle. | |
283 | * | |
284 | * fh_verify() may be called multiple times on a given filehandle, for | |
285 | * example, when processing an NFSv4 compound. The first call will look | |
286 | * up a dentry using the on-the-wire filehandle. Subsequent calls will | |
287 | * skip the lookup and just perform the other checks and possibly change | |
288 | * the current task's credentials. | |
1da177e4 | 289 | * |
b3d47676 BF |
290 | * @type specifies the type of object expected using one of the S_IF* |
291 | * constants defined in include/linux/stat.h. The caller may use zero | |
292 | * to indicate that it doesn't care, or a negative integer to indicate | |
293 | * that it expects something not of the given type. | |
1da177e4 | 294 | * |
b3d47676 BF |
295 | * @access is formed from the NFSD_MAY_* constants defined in |
296 | * include/linux/nfsd/nfsd.h. | |
1da177e4 | 297 | */ |
83b11340 | 298 | __be32 |
1da177e4 LT |
299 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
300 | { | |
03550fac | 301 | struct svc_export *exp; |
1da177e4 | 302 | struct dentry *dentry; |
03550fac | 303 | __be32 error; |
1da177e4 LT |
304 | |
305 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
306 | ||
1da177e4 | 307 | if (!fhp->fh_dentry) { |
03550fac | 308 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
309 | if (error) |
310 | goto out; | |
1da177e4 | 311 | } |
864f0f61 BF |
312 | dentry = fhp->fh_dentry; |
313 | exp = fhp->fh_export; | |
314 | /* | |
315 | * We still have to do all these permission checks, even when | |
316 | * fh_dentry is already set: | |
317 | * - fh_verify may be called multiple times with different | |
318 | * "access" arguments (e.g. nfsd_proc_create calls | |
319 | * fh_verify(...,NFSD_MAY_EXEC) first, then later (in | |
320 | * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). | |
321 | * - in the NFSv4 case, the filehandle may have been filled | |
322 | * in by fh_compose, and given a dentry, but further | |
323 | * compound operations performed with that filehandle | |
324 | * still need permissions checks. In the worst case, a | |
325 | * mountpoint crossing may have changed the export | |
326 | * options, and we may now need to use a different uid | |
327 | * (for example, if different id-squashing options are in | |
328 | * effect on the new filesystem). | |
329 | */ | |
03a816b4 SD |
330 | error = check_pseudo_root(rqstp, dentry, exp); |
331 | if (error) | |
332 | goto out; | |
333 | ||
864f0f61 BF |
334 | error = nfsd_setuser_and_check_port(rqstp, exp); |
335 | if (error) | |
336 | goto out; | |
7fc90ec9 | 337 | |
1da177e4 LT |
338 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
339 | if (error) | |
340 | goto out; | |
341 | ||
04716e66 BF |
342 | /* |
343 | * pseudoflavor restrictions are not enforced on NLM, | |
344 | * which clients virtually always use auth_sys for, | |
345 | * even while using RPCSEC_GSS for NFS. | |
346 | */ | |
347 | if (access & NFSD_MAY_LOCK) | |
348 | goto skip_pseudoflavor_check; | |
349 | /* | |
350 | * Clients may expect to be able to use auth_sys during mount, | |
351 | * even if they use gss for everything else; see section 2.3.2 | |
352 | * of rfc 2623. | |
353 | */ | |
354 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
355 | && exp->ex_path.dentry == dentry) | |
356 | goto skip_pseudoflavor_check; | |
357 | ||
358 | error = check_nfsd_access(exp, rqstp); | |
359 | if (error) | |
360 | goto out; | |
32c1eb0c | 361 | |
04716e66 | 362 | skip_pseudoflavor_check: |
1da177e4 | 363 | /* Finally, check access permissions. */ |
0ec757df | 364 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 365 | |
1da177e4 | 366 | if (error) { |
34e9a63b N |
367 | dprintk("fh_verify: %s/%s permission failure, " |
368 | "acc=%x, error=%d\n", | |
369 | dentry->d_parent->d_name.name, | |
370 | dentry->d_name.name, | |
fc2dd2e5 | 371 | access, ntohl(error)); |
1da177e4 | 372 | } |
1da177e4 | 373 | out: |
1da177e4 LT |
374 | if (error == nfserr_stale) |
375 | nfsdstats.fh_stale++; | |
376 | return error; | |
377 | } | |
378 | ||
379 | ||
380 | /* | |
381 | * Compose a file handle for an NFS reply. | |
382 | * | |
383 | * Note that when first composed, the dentry may not yet have | |
384 | * an inode. In this case a call to fh_update should be made | |
385 | * before the fh goes out on the wire ... | |
386 | */ | |
6e91ea2b CH |
387 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
388 | struct dentry *dentry) | |
1da177e4 | 389 | { |
54775491 | 390 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
391 | struct fid *fid = (struct fid *) |
392 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
393 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
394 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 395 | |
6e91ea2b CH |
396 | fhp->fh_handle.fh_fileid_type = |
397 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
398 | fhp->fh_handle.fh_size += maxsize * 4; | |
399 | } else { | |
400 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
401 | } | |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
405 | * for composing old style file handles | |
406 | */ | |
407 | static inline void _fh_update_old(struct dentry *dentry, | |
408 | struct svc_export *exp, | |
409 | struct knfsd_fh *fh) | |
410 | { | |
411 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
412 | fh->ofh_generation = dentry->d_inode->i_generation; | |
413 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
414 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
415 | fh->ofh_dirino = 0; | |
416 | } | |
417 | ||
8e498751 BF |
418 | static bool is_root_export(struct svc_export *exp) |
419 | { | |
420 | return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; | |
421 | } | |
422 | ||
423 | static struct super_block *exp_sb(struct svc_export *exp) | |
424 | { | |
425 | return exp->ex_path.dentry->d_inode->i_sb; | |
426 | } | |
427 | ||
428 | static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) | |
429 | { | |
430 | switch (fsid_type) { | |
431 | case FSID_DEV: | |
432 | if (!old_valid_dev(exp_sb(exp)->s_dev)) | |
433 | return 0; | |
434 | /* FALL THROUGH */ | |
435 | case FSID_MAJOR_MINOR: | |
436 | case FSID_ENCODE_DEV: | |
437 | return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; | |
438 | case FSID_NUM: | |
439 | return exp->ex_flags & NFSEXP_FSID; | |
440 | case FSID_UUID8: | |
441 | case FSID_UUID16: | |
442 | if (!is_root_export(exp)) | |
443 | return 0; | |
444 | /* fall through */ | |
445 | case FSID_UUID4_INUM: | |
446 | case FSID_UUID16_INUM: | |
447 | return exp->ex_uuid != NULL; | |
448 | } | |
449 | return 1; | |
450 | } | |
451 | ||
1da177e4 | 452 | |
bc6c53d5 BF |
453 | static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) |
454 | { | |
b41eeef1 | 455 | u8 version; |
bc6c53d5 BF |
456 | u8 fsid_type; |
457 | retry: | |
b41eeef1 | 458 | version = 1; |
7e405364 | 459 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 460 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
461 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
462 | ||
b41eeef1 N |
463 | ref_fh = NULL; |
464 | ||
465 | switch (version) { | |
466 | case 0xca: | |
af6a4e28 | 467 | fsid_type = FSID_DEV; |
b41eeef1 N |
468 | break; |
469 | case 1: | |
470 | break; | |
471 | default: | |
472 | goto retry; | |
473 | } | |
474 | ||
8e498751 BF |
475 | /* |
476 | * As the fsid -> filesystem mapping was guided by | |
477 | * user-space, there is no guarantee that the filesystem | |
478 | * actually supports that fsid type. If it doesn't we | |
479 | * loop around again without ref_fh set. | |
982aedfd | 480 | */ |
8e498751 BF |
481 | if (!fsid_type_ok_for_exp(fsid_type, exp)) |
482 | goto retry; | |
30fa8c01 SD |
483 | } else if (exp->ex_flags & NFSEXP_FSID) { |
484 | fsid_type = FSID_NUM; | |
af6a4e28 N |
485 | } else if (exp->ex_uuid) { |
486 | if (fhp->fh_maxsize >= 64) { | |
8e498751 | 487 | if (is_root_export(exp)) |
af6a4e28 N |
488 | fsid_type = FSID_UUID16; |
489 | else | |
490 | fsid_type = FSID_UUID16_INUM; | |
491 | } else { | |
8e498751 | 492 | if (is_root_export(exp)) |
af6a4e28 N |
493 | fsid_type = FSID_UUID8; |
494 | else | |
495 | fsid_type = FSID_UUID4_INUM; | |
496 | } | |
bc6c53d5 | 497 | } else if (!old_valid_dev(exp_sb(exp)->s_dev)) |
1da177e4 | 498 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 499 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 500 | else |
af6a4e28 | 501 | fsid_type = FSID_DEV; |
bc6c53d5 BF |
502 | fhp->fh_handle.fh_version = version; |
503 | if (version) | |
504 | fhp->fh_handle.fh_fsid_type = fsid_type; | |
505 | } | |
506 | ||
507 | __be32 | |
508 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, | |
509 | struct svc_fh *ref_fh) | |
510 | { | |
511 | /* ref_fh is a reference file handle. | |
512 | * if it is non-null and for the same filesystem, then we should compose | |
513 | * a filehandle which is of the same version, where possible. | |
514 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca | |
515 | * Then create a 32byte filehandle using nfs_fhbase_old | |
516 | * | |
517 | */ | |
518 | ||
519 | struct inode * inode = dentry->d_inode; | |
520 | struct dentry *parent = dentry->d_parent; | |
521 | __u32 *datap; | |
522 | dev_t ex_dev = exp_sb(exp)->s_dev; | |
523 | ||
524 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
525 | MAJOR(ex_dev), MINOR(ex_dev), | |
526 | (long) exp->ex_path.dentry->d_inode->i_ino, | |
527 | parent->d_name.name, dentry->d_name.name, | |
528 | (inode ? inode->i_ino : 0)); | |
529 | ||
530 | /* Choose filehandle version and fsid type based on | |
531 | * the reference filehandle (if it is in the same export) | |
532 | * or the export options. | |
533 | */ | |
534 | set_version_and_fsid_type(fhp, exp, ref_fh); | |
1da177e4 LT |
535 | |
536 | if (ref_fh == fhp) | |
537 | fh_put(ref_fh); | |
538 | ||
539 | if (fhp->fh_locked || fhp->fh_dentry) { | |
540 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 541 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
542 | } |
543 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
544 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
545 | fhp->fh_maxsize, |
546 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
547 | |
548 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
549 | fhp->fh_export = exp; | |
550 | cache_get(&exp->h); | |
551 | ||
bc6c53d5 | 552 | if (fhp->fh_handle.fh_version == 0xca) { |
1da177e4 LT |
553 | /* old style filehandle please */ |
554 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
555 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
556 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
557 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
558 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 559 | fhp->fh_handle.ofh_xino = |
54775491 | 560 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
561 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
562 | if (inode) | |
563 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
564 | } else { | |
565 | int len; | |
1da177e4 LT |
566 | fhp->fh_handle.fh_auth_type = 0; |
567 | datap = fhp->fh_handle.fh_auth+0; | |
bc6c53d5 | 568 | mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev, |
54775491 | 569 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
570 | exp->ex_fsid, exp->ex_uuid); |
571 | ||
bc6c53d5 | 572 | len = key_len(fhp->fh_handle.fh_fsid_type); |
1da177e4 LT |
573 | datap += len/4; |
574 | fhp->fh_handle.fh_size = 4 + len; | |
575 | ||
6e91ea2b CH |
576 | if (inode) |
577 | _fh_update(fhp, exp, dentry); | |
1be10a88 BF |
578 | if (fhp->fh_handle.fh_fileid_type == 255) { |
579 | fh_put(fhp); | |
1da177e4 | 580 | return nfserr_opnotsupp; |
1be10a88 | 581 | } |
1da177e4 LT |
582 | } |
583 | ||
1da177e4 LT |
584 | return 0; |
585 | } | |
586 | ||
587 | /* | |
588 | * Update file handle information after changing a dentry. | |
589 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
590 | */ | |
83b11340 | 591 | __be32 |
1da177e4 LT |
592 | fh_update(struct svc_fh *fhp) |
593 | { | |
594 | struct dentry *dentry; | |
982aedfd | 595 | |
1da177e4 LT |
596 | if (!fhp->fh_dentry) |
597 | goto out_bad; | |
598 | ||
599 | dentry = fhp->fh_dentry; | |
600 | if (!dentry->d_inode) | |
601 | goto out_negative; | |
602 | if (fhp->fh_handle.fh_version != 1) { | |
603 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
604 | } else { | |
6e91ea2b | 605 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 606 | goto out; |
6e91ea2b CH |
607 | |
608 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
609 | if (fhp->fh_handle.fh_fileid_type == 255) |
610 | return nfserr_opnotsupp; | |
611 | } | |
612 | out: | |
613 | return 0; | |
614 | ||
615 | out_bad: | |
616 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
617 | goto out; | |
618 | out_negative: | |
619 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
620 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
621 | goto out; | |
1da177e4 LT |
622 | } |
623 | ||
624 | /* | |
625 | * Release a file handle. | |
626 | */ | |
627 | void | |
628 | fh_put(struct svc_fh *fhp) | |
629 | { | |
630 | struct dentry * dentry = fhp->fh_dentry; | |
631 | struct svc_export * exp = fhp->fh_export; | |
632 | if (dentry) { | |
633 | fh_unlock(fhp); | |
634 | fhp->fh_dentry = NULL; | |
635 | dput(dentry); | |
636 | #ifdef CONFIG_NFSD_V3 | |
637 | fhp->fh_pre_saved = 0; | |
638 | fhp->fh_post_saved = 0; | |
639 | #endif | |
1da177e4 LT |
640 | } |
641 | if (exp) { | |
baab935f | 642 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
643 | fhp->fh_export = NULL; |
644 | } | |
645 | return; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Shorthand for dprintk()'s | |
650 | */ | |
651 | char * SVCFH_fmt(struct svc_fh *fhp) | |
652 | { | |
653 | struct knfsd_fh *fh = &fhp->fh_handle; | |
654 | ||
655 | static char buf[80]; | |
656 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
657 | fh->fh_size, | |
658 | fh->fh_base.fh_pad[0], | |
659 | fh->fh_base.fh_pad[1], | |
660 | fh->fh_base.fh_pad[2], | |
661 | fh->fh_base.fh_pad[3], | |
662 | fh->fh_base.fh_pad[4], | |
663 | fh->fh_base.fh_pad[5]); | |
664 | return buf; | |
665 | } | |
af6a4e28 N |
666 | |
667 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
668 | { | |
669 | if (fhp->fh_handle.fh_version != 1) | |
670 | return FSIDSOURCE_DEV; | |
671 | switch(fhp->fh_handle.fh_fsid_type) { | |
672 | case FSID_DEV: | |
673 | case FSID_ENCODE_DEV: | |
674 | case FSID_MAJOR_MINOR: | |
8e498751 | 675 | if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) |
b8da0d1c NB |
676 | return FSIDSOURCE_DEV; |
677 | break; | |
af6a4e28 | 678 | case FSID_NUM: |
af6a4e28 N |
679 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
680 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
681 | break; |
682 | default: | |
683 | break; | |
af6a4e28 | 684 | } |
b8da0d1c NB |
685 | /* either a UUID type filehandle, or the filehandle doesn't |
686 | * match the export. | |
687 | */ | |
688 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
689 | return FSIDSOURCE_FSID; | |
690 | if (fhp->fh_export->ex_uuid) | |
691 | return FSIDSOURCE_UUID; | |
692 | return FSIDSOURCE_DEV; | |
af6a4e28 | 693 | } |