Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/nfsfh.c | |
3 | * | |
4 | * NFS server file handle treatment. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> | |
8 | * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 | |
9 | * ... and again Southern-Winter 2001 to support export_operations | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/slab.h> |
1da177e4 LT |
13 | #include <linux/fs.h> |
14 | #include <linux/unistd.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/dcache.h> | |
a5694255 | 18 | #include <linux/exportfs.h> |
1da177e4 | 19 | #include <linux/mount.h> |
1da177e4 | 20 | |
ad06e4bd | 21 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 22 | #include <linux/sunrpc/svc.h> |
32c1eb0c | 23 | #include <linux/sunrpc/svcauth_gss.h> |
1da177e4 | 24 | #include <linux/nfsd/nfsd.h> |
2e8138a2 | 25 | #include "auth.h" |
1da177e4 LT |
26 | |
27 | #define NFSDDBG_FACILITY NFSDDBG_FH | |
1da177e4 LT |
28 | |
29 | ||
30 | static int nfsd_nr_verified; | |
31 | static int nfsd_nr_put; | |
32 | ||
1da177e4 LT |
33 | /* |
34 | * our acceptability function. | |
35 | * if NOSUBTREECHECK, accept anything | |
36 | * if not, require that we can walk up to exp->ex_dentry | |
37 | * doing some checks on the 'x' bits | |
38 | */ | |
39 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
40 | { | |
41 | struct svc_export *exp = expv; | |
42 | int rv; | |
43 | struct dentry *tdentry; | |
44 | struct dentry *parent; | |
45 | ||
46 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
47 | return 1; | |
48 | ||
49 | tdentry = dget(dentry); | |
54775491 | 50 | while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { |
1da177e4 LT |
51 | /* make sure parents give x permission to user */ |
52 | int err; | |
53 | parent = dget_parent(tdentry); | |
f419a2e3 | 54 | err = inode_permission(parent->d_inode, MAY_EXEC); |
1da177e4 LT |
55 | if (err < 0) { |
56 | dput(parent); | |
57 | break; | |
58 | } | |
59 | dput(tdentry); | |
60 | tdentry = parent; | |
61 | } | |
54775491 | 62 | if (tdentry != exp->ex_path.dentry) |
1da177e4 | 63 | dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); |
54775491 | 64 | rv = (tdentry == exp->ex_path.dentry); |
1da177e4 LT |
65 | dput(tdentry); |
66 | return rv; | |
67 | } | |
68 | ||
69 | /* Type check. The correct error return for type mismatches does not seem to be | |
70 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
71 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
72 | * the write call). | |
73 | */ | |
83b11340 | 74 | static inline __be32 |
1da177e4 LT |
75 | nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type) |
76 | { | |
77 | /* Type can be negative when creating hardlinks - not to a dir */ | |
78 | if (type > 0 && (mode & S_IFMT) != type) { | |
79 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
80 | return nfserr_symlink; | |
81 | else if (type == S_IFDIR) | |
82 | return nfserr_notdir; | |
83 | else if ((mode & S_IFMT) == S_IFDIR) | |
84 | return nfserr_isdir; | |
85 | else | |
86 | return nfserr_inval; | |
87 | } | |
88 | if (type < 0 && (mode & S_IFMT) == -type) { | |
89 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
90 | return nfserr_symlink; | |
91 | else if (type == -S_IFDIR) | |
92 | return nfserr_isdir; | |
93 | else | |
94 | return nfserr_notdir; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
6fa02839 BF |
99 | static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, |
100 | struct svc_export *exp) | |
101 | { | |
102 | /* Check if the request originated from a secure port. */ | |
103 | if (!rqstp->rq_secure && EX_SECURE(exp)) { | |
5216a8e7 | 104 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
6fa02839 BF |
105 | dprintk(KERN_WARNING |
106 | "nfsd: request from insecure port %s!\n", | |
107 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
108 | return nfserr_perm; | |
109 | } | |
110 | ||
111 | /* Set user creds for this exportpoint */ | |
112 | return nfserrno(nfsd_setuser(rqstp, exp)); | |
113 | } | |
114 | ||
03550fac BF |
115 | /* |
116 | * Use the given filehandle to look up the corresponding export and | |
117 | * dentry. On success, the results are used to set fh_export and | |
118 | * fh_dentry. | |
119 | */ | |
120 | static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
121 | { | |
122 | struct knfsd_fh *fh = &fhp->fh_handle; | |
123 | struct fid *fid = NULL, sfid; | |
124 | struct svc_export *exp; | |
125 | struct dentry *dentry; | |
126 | int fileid_type; | |
127 | int data_left = fh->fh_size/4; | |
128 | __be32 error; | |
129 | ||
130 | error = nfserr_stale; | |
131 | if (rqstp->rq_vers > 2) | |
132 | error = nfserr_badhandle; | |
133 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
134 | return nfserr_nofilehandle; | |
135 | ||
136 | if (fh->fh_version == 1) { | |
137 | int len; | |
138 | ||
139 | if (--data_left < 0) | |
140 | return error; | |
141 | if (fh->fh_auth_type != 0) | |
142 | return error; | |
143 | len = key_len(fh->fh_fsid_type) / 4; | |
144 | if (len == 0) | |
145 | return error; | |
146 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { | |
147 | /* deprecated, convert to type 3 */ | |
148 | len = key_len(FSID_ENCODE_DEV)/4; | |
149 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
150 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); | |
151 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
152 | } | |
153 | data_left -= len; | |
154 | if (data_left < 0) | |
155 | return error; | |
156 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth); | |
157 | fid = (struct fid *)(fh->fh_auth + len); | |
158 | } else { | |
159 | __u32 tfh[2]; | |
160 | dev_t xdev; | |
161 | ino_t xino; | |
162 | ||
163 | if (fh->fh_size != NFS_FHSIZE) | |
164 | return error; | |
165 | /* assume old filehandle format */ | |
166 | xdev = old_decode_dev(fh->ofh_xdev); | |
167 | xino = u32_to_ino_t(fh->ofh_xino); | |
168 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); | |
169 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); | |
170 | } | |
171 | ||
172 | error = nfserr_stale; | |
173 | if (PTR_ERR(exp) == -ENOENT) | |
174 | return error; | |
175 | ||
176 | if (IS_ERR(exp)) | |
177 | return nfserrno(PTR_ERR(exp)); | |
178 | ||
496d6c32 NB |
179 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
180 | /* Elevate privileges so that the lack of 'r' or 'x' | |
181 | * permission on some parent directory will | |
182 | * not stop exportfs_decode_fh from being able | |
183 | * to reconnect a directory into the dentry cache. | |
184 | * The same problem can affect "SUBTREECHECK" exports, | |
185 | * but as nfsd_acceptable depends on correct | |
186 | * access control settings being in effect, we cannot | |
187 | * fix that case easily. | |
188 | */ | |
d84f4f99 DH |
189 | struct cred *new = prepare_creds(); |
190 | if (!new) | |
191 | return nfserrno(-ENOMEM); | |
192 | new->cap_effective = | |
193 | cap_raise_nfsd_set(new->cap_effective, | |
194 | new->cap_permitted); | |
195 | put_cred(override_creds(new)); | |
196 | put_cred(new); | |
496d6c32 NB |
197 | } else { |
198 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
199 | if (error) | |
200 | goto out; | |
201 | } | |
03550fac BF |
202 | |
203 | /* | |
204 | * Look up the dentry using the NFS file handle. | |
205 | */ | |
206 | error = nfserr_stale; | |
207 | if (rqstp->rq_vers > 2) | |
208 | error = nfserr_badhandle; | |
209 | ||
210 | if (fh->fh_version != 1) { | |
211 | sfid.i32.ino = fh->ofh_ino; | |
212 | sfid.i32.gen = fh->ofh_generation; | |
213 | sfid.i32.parent_ino = fh->ofh_dirino; | |
214 | fid = &sfid; | |
215 | data_left = 3; | |
216 | if (fh->ofh_dirino == 0) | |
217 | fileid_type = FILEID_INO32_GEN; | |
218 | else | |
219 | fileid_type = FILEID_INO32_GEN_PARENT; | |
220 | } else | |
221 | fileid_type = fh->fh_fileid_type; | |
222 | ||
223 | if (fileid_type == FILEID_ROOT) | |
224 | dentry = dget(exp->ex_path.dentry); | |
225 | else { | |
226 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, | |
227 | data_left, fileid_type, | |
228 | nfsd_acceptable, exp); | |
229 | } | |
230 | if (dentry == NULL) | |
231 | goto out; | |
232 | if (IS_ERR(dentry)) { | |
233 | if (PTR_ERR(dentry) != -EINVAL) | |
234 | error = nfserrno(PTR_ERR(dentry)); | |
235 | goto out; | |
236 | } | |
237 | ||
496d6c32 NB |
238 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
239 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
240 | if (error) { | |
241 | dput(dentry); | |
242 | goto out; | |
243 | } | |
244 | } | |
245 | ||
03550fac BF |
246 | if (S_ISDIR(dentry->d_inode->i_mode) && |
247 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
248 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
249 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
250 | } | |
251 | ||
252 | fhp->fh_dentry = dentry; | |
253 | fhp->fh_export = exp; | |
254 | nfsd_nr_verified++; | |
255 | return 0; | |
256 | out: | |
257 | exp_put(exp); | |
258 | return error; | |
259 | } | |
260 | ||
b3d47676 BF |
261 | /** |
262 | * fh_verify - filehandle lookup and access checking | |
263 | * @rqstp: pointer to current rpc request | |
264 | * @fhp: filehandle to be verified | |
265 | * @type: expected type of object pointed to by filehandle | |
266 | * @access: type of access needed to object | |
267 | * | |
268 | * Look up a dentry from the on-the-wire filehandle, check the client's | |
269 | * access to the export, and set the current task's credentials. | |
270 | * | |
271 | * Regardless of success or failure of fh_verify(), fh_put() should be | |
272 | * called on @fhp when the caller is finished with the filehandle. | |
273 | * | |
274 | * fh_verify() may be called multiple times on a given filehandle, for | |
275 | * example, when processing an NFSv4 compound. The first call will look | |
276 | * up a dentry using the on-the-wire filehandle. Subsequent calls will | |
277 | * skip the lookup and just perform the other checks and possibly change | |
278 | * the current task's credentials. | |
1da177e4 | 279 | * |
b3d47676 BF |
280 | * @type specifies the type of object expected using one of the S_IF* |
281 | * constants defined in include/linux/stat.h. The caller may use zero | |
282 | * to indicate that it doesn't care, or a negative integer to indicate | |
283 | * that it expects something not of the given type. | |
1da177e4 | 284 | * |
b3d47676 BF |
285 | * @access is formed from the NFSD_MAY_* constants defined in |
286 | * include/linux/nfsd/nfsd.h. | |
1da177e4 | 287 | */ |
83b11340 | 288 | __be32 |
1da177e4 LT |
289 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
290 | { | |
03550fac | 291 | struct svc_export *exp; |
1da177e4 | 292 | struct dentry *dentry; |
03550fac | 293 | __be32 error; |
1da177e4 LT |
294 | |
295 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
296 | ||
1da177e4 | 297 | if (!fhp->fh_dentry) { |
03550fac | 298 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
299 | if (error) |
300 | goto out; | |
03550fac BF |
301 | dentry = fhp->fh_dentry; |
302 | exp = fhp->fh_export; | |
1da177e4 | 303 | } else { |
6fa02839 BF |
304 | /* |
305 | * just rechecking permissions | |
306 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create | |
307 | * does as well) | |
1da177e4 LT |
308 | */ |
309 | dprintk("nfsd: fh_verify - just checking\n"); | |
310 | dentry = fhp->fh_dentry; | |
311 | exp = fhp->fh_export; | |
6fa02839 BF |
312 | /* |
313 | * Set user creds for this exportpoint; necessary even | |
d1bbf14f N |
314 | * in the "just checking" case because this may be a |
315 | * filehandle that was created by fh_compose, and that | |
316 | * is about to be used in another nfsv4 compound | |
6fa02839 BF |
317 | * operation. |
318 | */ | |
319 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
d1bbf14f N |
320 | if (error) |
321 | goto out; | |
1da177e4 | 322 | } |
7fc90ec9 | 323 | |
1da177e4 LT |
324 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
325 | if (error) | |
326 | goto out; | |
327 | ||
04716e66 BF |
328 | /* |
329 | * pseudoflavor restrictions are not enforced on NLM, | |
330 | * which clients virtually always use auth_sys for, | |
331 | * even while using RPCSEC_GSS for NFS. | |
332 | */ | |
333 | if (access & NFSD_MAY_LOCK) | |
334 | goto skip_pseudoflavor_check; | |
335 | /* | |
336 | * Clients may expect to be able to use auth_sys during mount, | |
337 | * even if they use gss for everything else; see section 2.3.2 | |
338 | * of rfc 2623. | |
339 | */ | |
340 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
341 | && exp->ex_path.dentry == dentry) | |
342 | goto skip_pseudoflavor_check; | |
343 | ||
344 | error = check_nfsd_access(exp, rqstp); | |
345 | if (error) | |
346 | goto out; | |
32c1eb0c | 347 | |
04716e66 | 348 | skip_pseudoflavor_check: |
1da177e4 | 349 | /* Finally, check access permissions. */ |
0ec757df | 350 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 351 | |
1da177e4 | 352 | if (error) { |
34e9a63b N |
353 | dprintk("fh_verify: %s/%s permission failure, " |
354 | "acc=%x, error=%d\n", | |
355 | dentry->d_parent->d_name.name, | |
356 | dentry->d_name.name, | |
fc2dd2e5 | 357 | access, ntohl(error)); |
1da177e4 | 358 | } |
1da177e4 | 359 | out: |
1da177e4 LT |
360 | if (error == nfserr_stale) |
361 | nfsdstats.fh_stale++; | |
362 | return error; | |
363 | } | |
364 | ||
365 | ||
366 | /* | |
367 | * Compose a file handle for an NFS reply. | |
368 | * | |
369 | * Note that when first composed, the dentry may not yet have | |
370 | * an inode. In this case a call to fh_update should be made | |
371 | * before the fh goes out on the wire ... | |
372 | */ | |
6e91ea2b CH |
373 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
374 | struct dentry *dentry) | |
1da177e4 | 375 | { |
54775491 | 376 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
377 | struct fid *fid = (struct fid *) |
378 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
379 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
380 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 381 | |
6e91ea2b CH |
382 | fhp->fh_handle.fh_fileid_type = |
383 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
384 | fhp->fh_handle.fh_size += maxsize * 4; | |
385 | } else { | |
386 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
390 | /* | |
391 | * for composing old style file handles | |
392 | */ | |
393 | static inline void _fh_update_old(struct dentry *dentry, | |
394 | struct svc_export *exp, | |
395 | struct knfsd_fh *fh) | |
396 | { | |
397 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
398 | fh->ofh_generation = dentry->d_inode->i_generation; | |
399 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
400 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
401 | fh->ofh_dirino = 0; | |
402 | } | |
403 | ||
83b11340 | 404 | __be32 |
982aedfd N |
405 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, |
406 | struct svc_fh *ref_fh) | |
1da177e4 LT |
407 | { |
408 | /* ref_fh is a reference file handle. | |
7e405364 N |
409 | * if it is non-null and for the same filesystem, then we should compose |
410 | * a filehandle which is of the same version, where possible. | |
1da177e4 LT |
411 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca |
412 | * Then create a 32byte filehandle using nfs_fhbase_old | |
413 | * | |
414 | */ | |
415 | ||
b41eeef1 | 416 | u8 version; |
982aedfd | 417 | u8 fsid_type = 0; |
1da177e4 LT |
418 | struct inode * inode = dentry->d_inode; |
419 | struct dentry *parent = dentry->d_parent; | |
420 | __u32 *datap; | |
54775491 JB |
421 | dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev; |
422 | int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root); | |
1da177e4 LT |
423 | |
424 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
425 | MAJOR(ex_dev), MINOR(ex_dev), | |
54775491 | 426 | (long) exp->ex_path.dentry->d_inode->i_ino, |
1da177e4 LT |
427 | parent->d_name.name, dentry->d_name.name, |
428 | (inode ? inode->i_ino : 0)); | |
429 | ||
982aedfd N |
430 | /* Choose filehandle version and fsid type based on |
431 | * the reference filehandle (if it is in the same export) | |
432 | * or the export options. | |
433 | */ | |
b41eeef1 N |
434 | retry: |
435 | version = 1; | |
7e405364 | 436 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 437 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
438 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
439 | ||
440 | if (ref_fh == fhp) | |
441 | fh_put(ref_fh); | |
442 | ref_fh = NULL; | |
443 | ||
444 | switch (version) { | |
445 | case 0xca: | |
af6a4e28 | 446 | fsid_type = FSID_DEV; |
b41eeef1 N |
447 | break; |
448 | case 1: | |
449 | break; | |
450 | default: | |
451 | goto retry; | |
452 | } | |
453 | ||
454 | /* Need to check that this type works for this | |
455 | * export point. As the fsid -> filesystem mapping | |
456 | * was guided by user-space, there is no guarantee | |
457 | * that the filesystem actually supports that fsid | |
458 | * type. If it doesn't we loop around again without | |
459 | * ref_fh set. | |
982aedfd | 460 | */ |
b41eeef1 N |
461 | switch(fsid_type) { |
462 | case FSID_DEV: | |
463 | if (!old_valid_dev(ex_dev)) | |
464 | goto retry; | |
465 | /* FALL THROUGH */ | |
466 | case FSID_MAJOR_MINOR: | |
467 | case FSID_ENCODE_DEV: | |
54775491 | 468 | if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b41eeef1 N |
469 | & FS_REQUIRES_DEV)) |
470 | goto retry; | |
471 | break; | |
472 | case FSID_NUM: | |
473 | if (! (exp->ex_flags & NFSEXP_FSID)) | |
474 | goto retry; | |
475 | break; | |
476 | case FSID_UUID8: | |
477 | case FSID_UUID16: | |
478 | if (!root_export) | |
479 | goto retry; | |
480 | /* fall through */ | |
481 | case FSID_UUID4_INUM: | |
482 | case FSID_UUID16_INUM: | |
483 | if (exp->ex_uuid == NULL) | |
484 | goto retry; | |
485 | break; | |
486 | } | |
30fa8c01 SD |
487 | } else if (exp->ex_flags & NFSEXP_FSID) { |
488 | fsid_type = FSID_NUM; | |
af6a4e28 N |
489 | } else if (exp->ex_uuid) { |
490 | if (fhp->fh_maxsize >= 64) { | |
491 | if (root_export) | |
492 | fsid_type = FSID_UUID16; | |
493 | else | |
494 | fsid_type = FSID_UUID16_INUM; | |
495 | } else { | |
496 | if (root_export) | |
497 | fsid_type = FSID_UUID8; | |
498 | else | |
499 | fsid_type = FSID_UUID4_INUM; | |
500 | } | |
30fa8c01 | 501 | } else if (!old_valid_dev(ex_dev)) |
1da177e4 | 502 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 503 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 504 | else |
af6a4e28 | 505 | fsid_type = FSID_DEV; |
1da177e4 LT |
506 | |
507 | if (ref_fh == fhp) | |
508 | fh_put(ref_fh); | |
509 | ||
510 | if (fhp->fh_locked || fhp->fh_dentry) { | |
511 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 512 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
513 | } |
514 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
515 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
516 | fhp->fh_maxsize, |
517 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
518 | |
519 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
520 | fhp->fh_export = exp; | |
521 | cache_get(&exp->h); | |
522 | ||
982aedfd | 523 | if (version == 0xca) { |
1da177e4 LT |
524 | /* old style filehandle please */ |
525 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
526 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
527 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
528 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
529 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 530 | fhp->fh_handle.ofh_xino = |
54775491 | 531 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
532 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
533 | if (inode) | |
534 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
535 | } else { | |
536 | int len; | |
537 | fhp->fh_handle.fh_version = 1; | |
538 | fhp->fh_handle.fh_auth_type = 0; | |
539 | datap = fhp->fh_handle.fh_auth+0; | |
982aedfd | 540 | fhp->fh_handle.fh_fsid_type = fsid_type; |
af6a4e28 | 541 | mk_fsid(fsid_type, datap, ex_dev, |
54775491 | 542 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
543 | exp->ex_fsid, exp->ex_uuid); |
544 | ||
982aedfd | 545 | len = key_len(fsid_type); |
1da177e4 LT |
546 | datap += len/4; |
547 | fhp->fh_handle.fh_size = 4 + len; | |
548 | ||
6e91ea2b CH |
549 | if (inode) |
550 | _fh_update(fhp, exp, dentry); | |
1da177e4 LT |
551 | if (fhp->fh_handle.fh_fileid_type == 255) |
552 | return nfserr_opnotsupp; | |
553 | } | |
554 | ||
555 | nfsd_nr_verified++; | |
556 | return 0; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Update file handle information after changing a dentry. | |
561 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
562 | */ | |
83b11340 | 563 | __be32 |
1da177e4 LT |
564 | fh_update(struct svc_fh *fhp) |
565 | { | |
566 | struct dentry *dentry; | |
982aedfd | 567 | |
1da177e4 LT |
568 | if (!fhp->fh_dentry) |
569 | goto out_bad; | |
570 | ||
571 | dentry = fhp->fh_dentry; | |
572 | if (!dentry->d_inode) | |
573 | goto out_negative; | |
574 | if (fhp->fh_handle.fh_version != 1) { | |
575 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
576 | } else { | |
6e91ea2b | 577 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 578 | goto out; |
6e91ea2b CH |
579 | |
580 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
581 | if (fhp->fh_handle.fh_fileid_type == 255) |
582 | return nfserr_opnotsupp; | |
583 | } | |
584 | out: | |
585 | return 0; | |
586 | ||
587 | out_bad: | |
588 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
589 | goto out; | |
590 | out_negative: | |
591 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
592 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
593 | goto out; | |
1da177e4 LT |
594 | } |
595 | ||
596 | /* | |
597 | * Release a file handle. | |
598 | */ | |
599 | void | |
600 | fh_put(struct svc_fh *fhp) | |
601 | { | |
602 | struct dentry * dentry = fhp->fh_dentry; | |
603 | struct svc_export * exp = fhp->fh_export; | |
604 | if (dentry) { | |
605 | fh_unlock(fhp); | |
606 | fhp->fh_dentry = NULL; | |
607 | dput(dentry); | |
608 | #ifdef CONFIG_NFSD_V3 | |
609 | fhp->fh_pre_saved = 0; | |
610 | fhp->fh_post_saved = 0; | |
611 | #endif | |
612 | nfsd_nr_put++; | |
613 | } | |
614 | if (exp) { | |
baab935f | 615 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
616 | fhp->fh_export = NULL; |
617 | } | |
618 | return; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Shorthand for dprintk()'s | |
623 | */ | |
624 | char * SVCFH_fmt(struct svc_fh *fhp) | |
625 | { | |
626 | struct knfsd_fh *fh = &fhp->fh_handle; | |
627 | ||
628 | static char buf[80]; | |
629 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
630 | fh->fh_size, | |
631 | fh->fh_base.fh_pad[0], | |
632 | fh->fh_base.fh_pad[1], | |
633 | fh->fh_base.fh_pad[2], | |
634 | fh->fh_base.fh_pad[3], | |
635 | fh->fh_base.fh_pad[4], | |
636 | fh->fh_base.fh_pad[5]); | |
637 | return buf; | |
638 | } | |
af6a4e28 N |
639 | |
640 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
641 | { | |
642 | if (fhp->fh_handle.fh_version != 1) | |
643 | return FSIDSOURCE_DEV; | |
644 | switch(fhp->fh_handle.fh_fsid_type) { | |
645 | case FSID_DEV: | |
646 | case FSID_ENCODE_DEV: | |
647 | case FSID_MAJOR_MINOR: | |
54775491 | 648 | if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b8da0d1c NB |
649 | & FS_REQUIRES_DEV) |
650 | return FSIDSOURCE_DEV; | |
651 | break; | |
af6a4e28 | 652 | case FSID_NUM: |
af6a4e28 N |
653 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
654 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
655 | break; |
656 | default: | |
657 | break; | |
af6a4e28 | 658 | } |
b8da0d1c NB |
659 | /* either a UUID type filehandle, or the filehandle doesn't |
660 | * match the export. | |
661 | */ | |
662 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
663 | return FSIDSOURCE_FSID; | |
664 | if (fhp->fh_export->ex_uuid) | |
665 | return FSIDSOURCE_UUID; | |
666 | return FSIDSOURCE_DEV; | |
af6a4e28 | 667 | } |