Commit | Line | Data |
---|---|---|
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 | { | |
1da177e4 LT |
64 | if (type > 0 && (mode & S_IFMT) != type) { |
65 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
66 | return nfserr_symlink; | |
67 | else if (type == S_IFDIR) | |
68 | return nfserr_notdir; | |
69 | else if ((mode & S_IFMT) == S_IFDIR) | |
70 | return nfserr_isdir; | |
71 | else | |
72 | return nfserr_inval; | |
73 | } | |
1da177e4 LT |
74 | return 0; |
75 | } | |
76 | ||
6fa02839 BF |
77 | static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, |
78 | struct svc_export *exp) | |
79 | { | |
12045a6e BF |
80 | int flags = nfsexp_flags(rqstp, exp); |
81 | ||
6fa02839 | 82 | /* Check if the request originated from a secure port. */ |
3d354cbc | 83 | if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) { |
5216a8e7 | 84 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
6fa02839 BF |
85 | dprintk(KERN_WARNING |
86 | "nfsd: request from insecure port %s!\n", | |
87 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
88 | return nfserr_perm; | |
89 | } | |
90 | ||
91 | /* Set user creds for this exportpoint */ | |
92 | return nfserrno(nfsd_setuser(rqstp, exp)); | |
93 | } | |
94 | ||
03a816b4 SD |
95 | static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, |
96 | struct dentry *dentry, struct svc_export *exp) | |
97 | { | |
98 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) | |
99 | return nfs_ok; | |
100 | /* | |
101 | * v2/v3 clients have no need for the V4ROOT export--they use | |
102 | * the mount protocl instead; also, further V4ROOT checks may be | |
103 | * in v4-specific code, in which case v2/v3 clients could bypass | |
104 | * them. | |
105 | */ | |
106 | if (!nfsd_v4client(rqstp)) | |
107 | return nfserr_stale; | |
108 | /* | |
109 | * We're exposing only the directories and symlinks that have to be | |
110 | * traversed on the way to real exports: | |
111 | */ | |
112 | if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) && | |
113 | !S_ISLNK(dentry->d_inode->i_mode))) | |
114 | return nfserr_stale; | |
115 | /* | |
116 | * A pseudoroot export gives permission to access only one | |
117 | * single directory; the kernel has to make another upcall | |
118 | * before granting access to anything else under it: | |
119 | */ | |
120 | if (unlikely(dentry != exp->ex_path.dentry)) | |
121 | return nfserr_stale; | |
122 | return nfs_ok; | |
123 | } | |
124 | ||
03550fac BF |
125 | /* |
126 | * Use the given filehandle to look up the corresponding export and | |
127 | * dentry. On success, the results are used to set fh_export and | |
128 | * fh_dentry. | |
129 | */ | |
130 | static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
131 | { | |
132 | struct knfsd_fh *fh = &fhp->fh_handle; | |
133 | struct fid *fid = NULL, sfid; | |
134 | struct svc_export *exp; | |
135 | struct dentry *dentry; | |
136 | int fileid_type; | |
137 | int data_left = fh->fh_size/4; | |
138 | __be32 error; | |
139 | ||
140 | error = nfserr_stale; | |
141 | if (rqstp->rq_vers > 2) | |
142 | error = nfserr_badhandle; | |
143 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
144 | return nfserr_nofilehandle; | |
145 | ||
146 | if (fh->fh_version == 1) { | |
147 | int len; | |
148 | ||
149 | if (--data_left < 0) | |
150 | return error; | |
151 | if (fh->fh_auth_type != 0) | |
152 | return error; | |
153 | len = key_len(fh->fh_fsid_type) / 4; | |
154 | if (len == 0) | |
155 | return error; | |
156 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { | |
157 | /* deprecated, convert to type 3 */ | |
158 | len = key_len(FSID_ENCODE_DEV)/4; | |
159 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
160 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); | |
161 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
162 | } | |
163 | data_left -= len; | |
164 | if (data_left < 0) | |
165 | return error; | |
166 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth); | |
167 | fid = (struct fid *)(fh->fh_auth + len); | |
168 | } else { | |
169 | __u32 tfh[2]; | |
170 | dev_t xdev; | |
171 | ino_t xino; | |
172 | ||
173 | if (fh->fh_size != NFS_FHSIZE) | |
174 | return error; | |
175 | /* assume old filehandle format */ | |
176 | xdev = old_decode_dev(fh->ofh_xdev); | |
177 | xino = u32_to_ino_t(fh->ofh_xino); | |
178 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); | |
179 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); | |
180 | } | |
181 | ||
182 | error = nfserr_stale; | |
183 | if (PTR_ERR(exp) == -ENOENT) | |
184 | return error; | |
185 | ||
186 | if (IS_ERR(exp)) | |
187 | return nfserrno(PTR_ERR(exp)); | |
188 | ||
496d6c32 NB |
189 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
190 | /* Elevate privileges so that the lack of 'r' or 'x' | |
191 | * permission on some parent directory will | |
192 | * not stop exportfs_decode_fh from being able | |
193 | * to reconnect a directory into the dentry cache. | |
194 | * The same problem can affect "SUBTREECHECK" exports, | |
195 | * but as nfsd_acceptable depends on correct | |
196 | * access control settings being in effect, we cannot | |
197 | * fix that case easily. | |
198 | */ | |
d84f4f99 DH |
199 | struct cred *new = prepare_creds(); |
200 | if (!new) | |
201 | return nfserrno(-ENOMEM); | |
202 | new->cap_effective = | |
203 | cap_raise_nfsd_set(new->cap_effective, | |
204 | new->cap_permitted); | |
205 | put_cred(override_creds(new)); | |
206 | put_cred(new); | |
496d6c32 NB |
207 | } else { |
208 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
209 | if (error) | |
210 | goto out; | |
211 | } | |
03550fac BF |
212 | |
213 | /* | |
214 | * Look up the dentry using the NFS file handle. | |
215 | */ | |
216 | error = nfserr_stale; | |
217 | if (rqstp->rq_vers > 2) | |
218 | error = nfserr_badhandle; | |
219 | ||
220 | if (fh->fh_version != 1) { | |
221 | sfid.i32.ino = fh->ofh_ino; | |
222 | sfid.i32.gen = fh->ofh_generation; | |
223 | sfid.i32.parent_ino = fh->ofh_dirino; | |
224 | fid = &sfid; | |
225 | data_left = 3; | |
226 | if (fh->ofh_dirino == 0) | |
227 | fileid_type = FILEID_INO32_GEN; | |
228 | else | |
229 | fileid_type = FILEID_INO32_GEN_PARENT; | |
230 | } else | |
231 | fileid_type = fh->fh_fileid_type; | |
232 | ||
233 | if (fileid_type == FILEID_ROOT) | |
234 | dentry = dget(exp->ex_path.dentry); | |
235 | else { | |
236 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, | |
237 | data_left, fileid_type, | |
238 | nfsd_acceptable, exp); | |
239 | } | |
240 | if (dentry == NULL) | |
241 | goto out; | |
242 | if (IS_ERR(dentry)) { | |
243 | if (PTR_ERR(dentry) != -EINVAL) | |
244 | error = nfserrno(PTR_ERR(dentry)); | |
245 | goto out; | |
246 | } | |
247 | ||
248 | if (S_ISDIR(dentry->d_inode->i_mode) && | |
249 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
250 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
251 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
252 | } | |
253 | ||
254 | fhp->fh_dentry = dentry; | |
255 | fhp->fh_export = exp; | |
03550fac BF |
256 | return 0; |
257 | out: | |
258 | exp_put(exp); | |
259 | return error; | |
260 | } | |
261 | ||
b3d47676 BF |
262 | /** |
263 | * fh_verify - filehandle lookup and access checking | |
264 | * @rqstp: pointer to current rpc request | |
265 | * @fhp: filehandle to be verified | |
266 | * @type: expected type of object pointed to by filehandle | |
267 | * @access: type of access needed to object | |
268 | * | |
269 | * Look up a dentry from the on-the-wire filehandle, check the client's | |
270 | * access to the export, and set the current task's credentials. | |
271 | * | |
272 | * Regardless of success or failure of fh_verify(), fh_put() should be | |
273 | * called on @fhp when the caller is finished with the filehandle. | |
274 | * | |
275 | * fh_verify() may be called multiple times on a given filehandle, for | |
276 | * example, when processing an NFSv4 compound. The first call will look | |
277 | * up a dentry using the on-the-wire filehandle. Subsequent calls will | |
278 | * skip the lookup and just perform the other checks and possibly change | |
279 | * the current task's credentials. | |
1da177e4 | 280 | * |
b3d47676 BF |
281 | * @type specifies the type of object expected using one of the S_IF* |
282 | * constants defined in include/linux/stat.h. The caller may use zero | |
283 | * to indicate that it doesn't care, or a negative integer to indicate | |
284 | * that it expects something not of the given type. | |
1da177e4 | 285 | * |
b3d47676 BF |
286 | * @access is formed from the NFSD_MAY_* constants defined in |
287 | * include/linux/nfsd/nfsd.h. | |
1da177e4 | 288 | */ |
83b11340 | 289 | __be32 |
1da177e4 LT |
290 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
291 | { | |
03550fac | 292 | struct svc_export *exp; |
1da177e4 | 293 | struct dentry *dentry; |
03550fac | 294 | __be32 error; |
1da177e4 LT |
295 | |
296 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
297 | ||
1da177e4 | 298 | if (!fhp->fh_dentry) { |
03550fac | 299 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
300 | if (error) |
301 | goto out; | |
1da177e4 | 302 | } |
864f0f61 BF |
303 | dentry = fhp->fh_dentry; |
304 | exp = fhp->fh_export; | |
305 | /* | |
306 | * We still have to do all these permission checks, even when | |
307 | * fh_dentry is already set: | |
308 | * - fh_verify may be called multiple times with different | |
309 | * "access" arguments (e.g. nfsd_proc_create calls | |
310 | * fh_verify(...,NFSD_MAY_EXEC) first, then later (in | |
311 | * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). | |
312 | * - in the NFSv4 case, the filehandle may have been filled | |
313 | * in by fh_compose, and given a dentry, but further | |
314 | * compound operations performed with that filehandle | |
315 | * still need permissions checks. In the worst case, a | |
316 | * mountpoint crossing may have changed the export | |
317 | * options, and we may now need to use a different uid | |
318 | * (for example, if different id-squashing options are in | |
319 | * effect on the new filesystem). | |
320 | */ | |
03a816b4 SD |
321 | error = check_pseudo_root(rqstp, dentry, exp); |
322 | if (error) | |
323 | goto out; | |
324 | ||
864f0f61 BF |
325 | error = nfsd_setuser_and_check_port(rqstp, exp); |
326 | if (error) | |
327 | goto out; | |
7fc90ec9 | 328 | |
1da177e4 LT |
329 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
330 | if (error) | |
331 | goto out; | |
332 | ||
04716e66 BF |
333 | /* |
334 | * pseudoflavor restrictions are not enforced on NLM, | |
335 | * which clients virtually always use auth_sys for, | |
336 | * even while using RPCSEC_GSS for NFS. | |
337 | */ | |
204f4ce7 | 338 | if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) |
04716e66 BF |
339 | goto skip_pseudoflavor_check; |
340 | /* | |
341 | * Clients may expect to be able to use auth_sys during mount, | |
342 | * even if they use gss for everything else; see section 2.3.2 | |
343 | * of rfc 2623. | |
344 | */ | |
345 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
346 | && exp->ex_path.dentry == dentry) | |
347 | goto skip_pseudoflavor_check; | |
348 | ||
349 | error = check_nfsd_access(exp, rqstp); | |
350 | if (error) | |
351 | goto out; | |
32c1eb0c | 352 | |
04716e66 | 353 | skip_pseudoflavor_check: |
1da177e4 | 354 | /* Finally, check access permissions. */ |
0ec757df | 355 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 356 | |
1da177e4 | 357 | if (error) { |
34e9a63b N |
358 | dprintk("fh_verify: %s/%s permission failure, " |
359 | "acc=%x, error=%d\n", | |
360 | dentry->d_parent->d_name.name, | |
361 | dentry->d_name.name, | |
fc2dd2e5 | 362 | access, ntohl(error)); |
1da177e4 | 363 | } |
1da177e4 | 364 | out: |
1da177e4 LT |
365 | if (error == nfserr_stale) |
366 | nfsdstats.fh_stale++; | |
367 | return error; | |
368 | } | |
369 | ||
370 | ||
371 | /* | |
372 | * Compose a file handle for an NFS reply. | |
373 | * | |
374 | * Note that when first composed, the dentry may not yet have | |
375 | * an inode. In this case a call to fh_update should be made | |
376 | * before the fh goes out on the wire ... | |
377 | */ | |
6e91ea2b CH |
378 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
379 | struct dentry *dentry) | |
1da177e4 | 380 | { |
54775491 | 381 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
382 | struct fid *fid = (struct fid *) |
383 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
384 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
385 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 386 | |
6e91ea2b CH |
387 | fhp->fh_handle.fh_fileid_type = |
388 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
389 | fhp->fh_handle.fh_size += maxsize * 4; | |
390 | } else { | |
391 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
392 | } | |
1da177e4 LT |
393 | } |
394 | ||
395 | /* | |
396 | * for composing old style file handles | |
397 | */ | |
398 | static inline void _fh_update_old(struct dentry *dentry, | |
399 | struct svc_export *exp, | |
400 | struct knfsd_fh *fh) | |
401 | { | |
402 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
403 | fh->ofh_generation = dentry->d_inode->i_generation; | |
404 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
405 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
406 | fh->ofh_dirino = 0; | |
407 | } | |
408 | ||
8e498751 BF |
409 | static bool is_root_export(struct svc_export *exp) |
410 | { | |
411 | return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; | |
412 | } | |
413 | ||
414 | static struct super_block *exp_sb(struct svc_export *exp) | |
415 | { | |
416 | return exp->ex_path.dentry->d_inode->i_sb; | |
417 | } | |
418 | ||
419 | static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) | |
420 | { | |
421 | switch (fsid_type) { | |
422 | case FSID_DEV: | |
423 | if (!old_valid_dev(exp_sb(exp)->s_dev)) | |
424 | return 0; | |
425 | /* FALL THROUGH */ | |
426 | case FSID_MAJOR_MINOR: | |
427 | case FSID_ENCODE_DEV: | |
428 | return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; | |
429 | case FSID_NUM: | |
430 | return exp->ex_flags & NFSEXP_FSID; | |
431 | case FSID_UUID8: | |
432 | case FSID_UUID16: | |
433 | if (!is_root_export(exp)) | |
434 | return 0; | |
435 | /* fall through */ | |
436 | case FSID_UUID4_INUM: | |
437 | case FSID_UUID16_INUM: | |
438 | return exp->ex_uuid != NULL; | |
439 | } | |
440 | return 1; | |
441 | } | |
442 | ||
1da177e4 | 443 | |
bc6c53d5 BF |
444 | static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) |
445 | { | |
b41eeef1 | 446 | u8 version; |
bc6c53d5 BF |
447 | u8 fsid_type; |
448 | retry: | |
b41eeef1 | 449 | version = 1; |
7e405364 | 450 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 451 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
452 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
453 | ||
b41eeef1 N |
454 | ref_fh = NULL; |
455 | ||
456 | switch (version) { | |
457 | case 0xca: | |
af6a4e28 | 458 | fsid_type = FSID_DEV; |
b41eeef1 N |
459 | break; |
460 | case 1: | |
461 | break; | |
462 | default: | |
463 | goto retry; | |
464 | } | |
465 | ||
8e498751 BF |
466 | /* |
467 | * As the fsid -> filesystem mapping was guided by | |
468 | * user-space, there is no guarantee that the filesystem | |
469 | * actually supports that fsid type. If it doesn't we | |
470 | * loop around again without ref_fh set. | |
982aedfd | 471 | */ |
8e498751 BF |
472 | if (!fsid_type_ok_for_exp(fsid_type, exp)) |
473 | goto retry; | |
30fa8c01 SD |
474 | } else if (exp->ex_flags & NFSEXP_FSID) { |
475 | fsid_type = FSID_NUM; | |
af6a4e28 N |
476 | } else if (exp->ex_uuid) { |
477 | if (fhp->fh_maxsize >= 64) { | |
8e498751 | 478 | if (is_root_export(exp)) |
af6a4e28 N |
479 | fsid_type = FSID_UUID16; |
480 | else | |
481 | fsid_type = FSID_UUID16_INUM; | |
482 | } else { | |
8e498751 | 483 | if (is_root_export(exp)) |
af6a4e28 N |
484 | fsid_type = FSID_UUID8; |
485 | else | |
486 | fsid_type = FSID_UUID4_INUM; | |
487 | } | |
bc6c53d5 | 488 | } else if (!old_valid_dev(exp_sb(exp)->s_dev)) |
1da177e4 | 489 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 490 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 491 | else |
af6a4e28 | 492 | fsid_type = FSID_DEV; |
bc6c53d5 BF |
493 | fhp->fh_handle.fh_version = version; |
494 | if (version) | |
495 | fhp->fh_handle.fh_fsid_type = fsid_type; | |
496 | } | |
497 | ||
498 | __be32 | |
499 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, | |
500 | struct svc_fh *ref_fh) | |
501 | { | |
502 | /* ref_fh is a reference file handle. | |
503 | * if it is non-null and for the same filesystem, then we should compose | |
504 | * a filehandle which is of the same version, where possible. | |
505 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca | |
506 | * Then create a 32byte filehandle using nfs_fhbase_old | |
507 | * | |
508 | */ | |
509 | ||
510 | struct inode * inode = dentry->d_inode; | |
511 | struct dentry *parent = dentry->d_parent; | |
512 | __u32 *datap; | |
513 | dev_t ex_dev = exp_sb(exp)->s_dev; | |
514 | ||
515 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
516 | MAJOR(ex_dev), MINOR(ex_dev), | |
517 | (long) exp->ex_path.dentry->d_inode->i_ino, | |
518 | parent->d_name.name, dentry->d_name.name, | |
519 | (inode ? inode->i_ino : 0)); | |
520 | ||
521 | /* Choose filehandle version and fsid type based on | |
522 | * the reference filehandle (if it is in the same export) | |
523 | * or the export options. | |
524 | */ | |
525 | set_version_and_fsid_type(fhp, exp, ref_fh); | |
1da177e4 LT |
526 | |
527 | if (ref_fh == fhp) | |
528 | fh_put(ref_fh); | |
529 | ||
530 | if (fhp->fh_locked || fhp->fh_dentry) { | |
531 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 532 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
533 | } |
534 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
535 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
536 | fhp->fh_maxsize, |
537 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
538 | |
539 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
540 | fhp->fh_export = exp; | |
541 | cache_get(&exp->h); | |
542 | ||
bc6c53d5 | 543 | if (fhp->fh_handle.fh_version == 0xca) { |
1da177e4 LT |
544 | /* old style filehandle please */ |
545 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
546 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
547 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
548 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
549 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 550 | fhp->fh_handle.ofh_xino = |
54775491 | 551 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
552 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
553 | if (inode) | |
554 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
555 | } else { | |
556 | int len; | |
1da177e4 LT |
557 | fhp->fh_handle.fh_auth_type = 0; |
558 | datap = fhp->fh_handle.fh_auth+0; | |
bc6c53d5 | 559 | mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev, |
54775491 | 560 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
561 | exp->ex_fsid, exp->ex_uuid); |
562 | ||
bc6c53d5 | 563 | len = key_len(fhp->fh_handle.fh_fsid_type); |
1da177e4 LT |
564 | datap += len/4; |
565 | fhp->fh_handle.fh_size = 4 + len; | |
566 | ||
6e91ea2b CH |
567 | if (inode) |
568 | _fh_update(fhp, exp, dentry); | |
1be10a88 BF |
569 | if (fhp->fh_handle.fh_fileid_type == 255) { |
570 | fh_put(fhp); | |
1da177e4 | 571 | return nfserr_opnotsupp; |
1be10a88 | 572 | } |
1da177e4 LT |
573 | } |
574 | ||
1da177e4 LT |
575 | return 0; |
576 | } | |
577 | ||
578 | /* | |
579 | * Update file handle information after changing a dentry. | |
580 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
581 | */ | |
83b11340 | 582 | __be32 |
1da177e4 LT |
583 | fh_update(struct svc_fh *fhp) |
584 | { | |
585 | struct dentry *dentry; | |
982aedfd | 586 | |
1da177e4 LT |
587 | if (!fhp->fh_dentry) |
588 | goto out_bad; | |
589 | ||
590 | dentry = fhp->fh_dentry; | |
591 | if (!dentry->d_inode) | |
592 | goto out_negative; | |
593 | if (fhp->fh_handle.fh_version != 1) { | |
594 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
595 | } else { | |
6e91ea2b | 596 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 597 | goto out; |
6e91ea2b CH |
598 | |
599 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
600 | if (fhp->fh_handle.fh_fileid_type == 255) |
601 | return nfserr_opnotsupp; | |
602 | } | |
603 | out: | |
604 | return 0; | |
605 | ||
606 | out_bad: | |
607 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
608 | goto out; | |
609 | out_negative: | |
610 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
611 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
612 | goto out; | |
1da177e4 LT |
613 | } |
614 | ||
615 | /* | |
616 | * Release a file handle. | |
617 | */ | |
618 | void | |
619 | fh_put(struct svc_fh *fhp) | |
620 | { | |
621 | struct dentry * dentry = fhp->fh_dentry; | |
622 | struct svc_export * exp = fhp->fh_export; | |
623 | if (dentry) { | |
624 | fh_unlock(fhp); | |
625 | fhp->fh_dentry = NULL; | |
626 | dput(dentry); | |
627 | #ifdef CONFIG_NFSD_V3 | |
628 | fhp->fh_pre_saved = 0; | |
629 | fhp->fh_post_saved = 0; | |
630 | #endif | |
1da177e4 LT |
631 | } |
632 | if (exp) { | |
baab935f | 633 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
634 | fhp->fh_export = NULL; |
635 | } | |
636 | return; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Shorthand for dprintk()'s | |
641 | */ | |
642 | char * SVCFH_fmt(struct svc_fh *fhp) | |
643 | { | |
644 | struct knfsd_fh *fh = &fhp->fh_handle; | |
645 | ||
646 | static char buf[80]; | |
647 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
648 | fh->fh_size, | |
649 | fh->fh_base.fh_pad[0], | |
650 | fh->fh_base.fh_pad[1], | |
651 | fh->fh_base.fh_pad[2], | |
652 | fh->fh_base.fh_pad[3], | |
653 | fh->fh_base.fh_pad[4], | |
654 | fh->fh_base.fh_pad[5]); | |
655 | return buf; | |
656 | } | |
af6a4e28 N |
657 | |
658 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
659 | { | |
660 | if (fhp->fh_handle.fh_version != 1) | |
661 | return FSIDSOURCE_DEV; | |
662 | switch(fhp->fh_handle.fh_fsid_type) { | |
663 | case FSID_DEV: | |
664 | case FSID_ENCODE_DEV: | |
665 | case FSID_MAJOR_MINOR: | |
8e498751 | 666 | if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) |
b8da0d1c NB |
667 | return FSIDSOURCE_DEV; |
668 | break; | |
af6a4e28 | 669 | case FSID_NUM: |
af6a4e28 N |
670 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
671 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
672 | break; |
673 | default: | |
674 | break; | |
af6a4e28 | 675 | } |
b8da0d1c NB |
676 | /* either a UUID type filehandle, or the filehandle doesn't |
677 | * match the export. | |
678 | */ | |
679 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
680 | return FSIDSOURCE_FSID; | |
681 | if (fhp->fh_export->ex_uuid) | |
682 | return FSIDSOURCE_UUID; | |
683 | return FSIDSOURCE_DEV; | |
af6a4e28 | 684 | } |