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Commit | Line | Data |
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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 | ||
1da177e4 LT |
261 | /* |
262 | * Perform sanity checks on the dentry in a client's file handle. | |
263 | * | |
264 | * Note that the file handle dentry may need to be freed even after | |
265 | * an error return. | |
266 | * | |
267 | * This is only called at the start of an nfsproc call, so fhp points to | |
268 | * a svc_fh which is all 0 except for the over-the-wire file handle. | |
269 | */ | |
83b11340 | 270 | __be32 |
1da177e4 LT |
271 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
272 | { | |
03550fac | 273 | struct svc_export *exp; |
1da177e4 | 274 | struct dentry *dentry; |
03550fac | 275 | __be32 error; |
1da177e4 LT |
276 | |
277 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
278 | ||
1da177e4 | 279 | if (!fhp->fh_dentry) { |
03550fac | 280 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
281 | if (error) |
282 | goto out; | |
03550fac BF |
283 | dentry = fhp->fh_dentry; |
284 | exp = fhp->fh_export; | |
1da177e4 | 285 | } else { |
6fa02839 BF |
286 | /* |
287 | * just rechecking permissions | |
288 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create | |
289 | * does as well) | |
1da177e4 LT |
290 | */ |
291 | dprintk("nfsd: fh_verify - just checking\n"); | |
292 | dentry = fhp->fh_dentry; | |
293 | exp = fhp->fh_export; | |
6fa02839 BF |
294 | /* |
295 | * Set user creds for this exportpoint; necessary even | |
d1bbf14f N |
296 | * in the "just checking" case because this may be a |
297 | * filehandle that was created by fh_compose, and that | |
298 | * is about to be used in another nfsv4 compound | |
6fa02839 BF |
299 | * operation. |
300 | */ | |
301 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
d1bbf14f N |
302 | if (error) |
303 | goto out; | |
1da177e4 | 304 | } |
7fc90ec9 | 305 | |
1da177e4 LT |
306 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
307 | if (error) | |
308 | goto out; | |
309 | ||
04716e66 BF |
310 | /* |
311 | * pseudoflavor restrictions are not enforced on NLM, | |
312 | * which clients virtually always use auth_sys for, | |
313 | * even while using RPCSEC_GSS for NFS. | |
314 | */ | |
315 | if (access & NFSD_MAY_LOCK) | |
316 | goto skip_pseudoflavor_check; | |
317 | /* | |
318 | * Clients may expect to be able to use auth_sys during mount, | |
319 | * even if they use gss for everything else; see section 2.3.2 | |
320 | * of rfc 2623. | |
321 | */ | |
322 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
323 | && exp->ex_path.dentry == dentry) | |
324 | goto skip_pseudoflavor_check; | |
325 | ||
326 | error = check_nfsd_access(exp, rqstp); | |
327 | if (error) | |
328 | goto out; | |
32c1eb0c | 329 | |
04716e66 | 330 | skip_pseudoflavor_check: |
1da177e4 | 331 | /* Finally, check access permissions. */ |
0ec757df | 332 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 333 | |
1da177e4 | 334 | if (error) { |
34e9a63b N |
335 | dprintk("fh_verify: %s/%s permission failure, " |
336 | "acc=%x, error=%d\n", | |
337 | dentry->d_parent->d_name.name, | |
338 | dentry->d_name.name, | |
fc2dd2e5 | 339 | access, ntohl(error)); |
1da177e4 | 340 | } |
1da177e4 | 341 | out: |
1da177e4 LT |
342 | if (error == nfserr_stale) |
343 | nfsdstats.fh_stale++; | |
344 | return error; | |
345 | } | |
346 | ||
347 | ||
348 | /* | |
349 | * Compose a file handle for an NFS reply. | |
350 | * | |
351 | * Note that when first composed, the dentry may not yet have | |
352 | * an inode. In this case a call to fh_update should be made | |
353 | * before the fh goes out on the wire ... | |
354 | */ | |
6e91ea2b CH |
355 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
356 | struct dentry *dentry) | |
1da177e4 | 357 | { |
54775491 | 358 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
359 | struct fid *fid = (struct fid *) |
360 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
361 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
362 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 363 | |
6e91ea2b CH |
364 | fhp->fh_handle.fh_fileid_type = |
365 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
366 | fhp->fh_handle.fh_size += maxsize * 4; | |
367 | } else { | |
368 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
369 | } | |
1da177e4 LT |
370 | } |
371 | ||
372 | /* | |
373 | * for composing old style file handles | |
374 | */ | |
375 | static inline void _fh_update_old(struct dentry *dentry, | |
376 | struct svc_export *exp, | |
377 | struct knfsd_fh *fh) | |
378 | { | |
379 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
380 | fh->ofh_generation = dentry->d_inode->i_generation; | |
381 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
382 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
383 | fh->ofh_dirino = 0; | |
384 | } | |
385 | ||
83b11340 | 386 | __be32 |
982aedfd N |
387 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, |
388 | struct svc_fh *ref_fh) | |
1da177e4 LT |
389 | { |
390 | /* ref_fh is a reference file handle. | |
7e405364 N |
391 | * if it is non-null and for the same filesystem, then we should compose |
392 | * a filehandle which is of the same version, where possible. | |
1da177e4 LT |
393 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca |
394 | * Then create a 32byte filehandle using nfs_fhbase_old | |
395 | * | |
396 | */ | |
397 | ||
b41eeef1 | 398 | u8 version; |
982aedfd | 399 | u8 fsid_type = 0; |
1da177e4 LT |
400 | struct inode * inode = dentry->d_inode; |
401 | struct dentry *parent = dentry->d_parent; | |
402 | __u32 *datap; | |
54775491 JB |
403 | dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev; |
404 | int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root); | |
1da177e4 LT |
405 | |
406 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
407 | MAJOR(ex_dev), MINOR(ex_dev), | |
54775491 | 408 | (long) exp->ex_path.dentry->d_inode->i_ino, |
1da177e4 LT |
409 | parent->d_name.name, dentry->d_name.name, |
410 | (inode ? inode->i_ino : 0)); | |
411 | ||
982aedfd N |
412 | /* Choose filehandle version and fsid type based on |
413 | * the reference filehandle (if it is in the same export) | |
414 | * or the export options. | |
415 | */ | |
b41eeef1 N |
416 | retry: |
417 | version = 1; | |
7e405364 | 418 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 419 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
420 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
421 | ||
422 | if (ref_fh == fhp) | |
423 | fh_put(ref_fh); | |
424 | ref_fh = NULL; | |
425 | ||
426 | switch (version) { | |
427 | case 0xca: | |
af6a4e28 | 428 | fsid_type = FSID_DEV; |
b41eeef1 N |
429 | break; |
430 | case 1: | |
431 | break; | |
432 | default: | |
433 | goto retry; | |
434 | } | |
435 | ||
436 | /* Need to check that this type works for this | |
437 | * export point. As the fsid -> filesystem mapping | |
438 | * was guided by user-space, there is no guarantee | |
439 | * that the filesystem actually supports that fsid | |
440 | * type. If it doesn't we loop around again without | |
441 | * ref_fh set. | |
982aedfd | 442 | */ |
b41eeef1 N |
443 | switch(fsid_type) { |
444 | case FSID_DEV: | |
445 | if (!old_valid_dev(ex_dev)) | |
446 | goto retry; | |
447 | /* FALL THROUGH */ | |
448 | case FSID_MAJOR_MINOR: | |
449 | case FSID_ENCODE_DEV: | |
54775491 | 450 | if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b41eeef1 N |
451 | & FS_REQUIRES_DEV)) |
452 | goto retry; | |
453 | break; | |
454 | case FSID_NUM: | |
455 | if (! (exp->ex_flags & NFSEXP_FSID)) | |
456 | goto retry; | |
457 | break; | |
458 | case FSID_UUID8: | |
459 | case FSID_UUID16: | |
460 | if (!root_export) | |
461 | goto retry; | |
462 | /* fall through */ | |
463 | case FSID_UUID4_INUM: | |
464 | case FSID_UUID16_INUM: | |
465 | if (exp->ex_uuid == NULL) | |
466 | goto retry; | |
467 | break; | |
468 | } | |
af6a4e28 N |
469 | } else if (exp->ex_uuid) { |
470 | if (fhp->fh_maxsize >= 64) { | |
471 | if (root_export) | |
472 | fsid_type = FSID_UUID16; | |
473 | else | |
474 | fsid_type = FSID_UUID16_INUM; | |
475 | } else { | |
476 | if (root_export) | |
477 | fsid_type = FSID_UUID8; | |
478 | else | |
479 | fsid_type = FSID_UUID4_INUM; | |
480 | } | |
1da177e4 | 481 | } else if (exp->ex_flags & NFSEXP_FSID) |
af6a4e28 | 482 | fsid_type = FSID_NUM; |
982aedfd | 483 | else if (!old_valid_dev(ex_dev)) |
1da177e4 | 484 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 485 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 486 | else |
af6a4e28 | 487 | fsid_type = FSID_DEV; |
1da177e4 LT |
488 | |
489 | if (ref_fh == fhp) | |
490 | fh_put(ref_fh); | |
491 | ||
492 | if (fhp->fh_locked || fhp->fh_dentry) { | |
493 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 494 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
495 | } |
496 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
497 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
498 | fhp->fh_maxsize, |
499 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
500 | |
501 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
502 | fhp->fh_export = exp; | |
503 | cache_get(&exp->h); | |
504 | ||
982aedfd | 505 | if (version == 0xca) { |
1da177e4 LT |
506 | /* old style filehandle please */ |
507 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
508 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
509 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
510 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
511 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 512 | fhp->fh_handle.ofh_xino = |
54775491 | 513 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
514 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
515 | if (inode) | |
516 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
517 | } else { | |
518 | int len; | |
519 | fhp->fh_handle.fh_version = 1; | |
520 | fhp->fh_handle.fh_auth_type = 0; | |
521 | datap = fhp->fh_handle.fh_auth+0; | |
982aedfd | 522 | fhp->fh_handle.fh_fsid_type = fsid_type; |
af6a4e28 | 523 | mk_fsid(fsid_type, datap, ex_dev, |
54775491 | 524 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
525 | exp->ex_fsid, exp->ex_uuid); |
526 | ||
982aedfd | 527 | len = key_len(fsid_type); |
1da177e4 LT |
528 | datap += len/4; |
529 | fhp->fh_handle.fh_size = 4 + len; | |
530 | ||
6e91ea2b CH |
531 | if (inode) |
532 | _fh_update(fhp, exp, dentry); | |
1da177e4 LT |
533 | if (fhp->fh_handle.fh_fileid_type == 255) |
534 | return nfserr_opnotsupp; | |
535 | } | |
536 | ||
537 | nfsd_nr_verified++; | |
538 | return 0; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Update file handle information after changing a dentry. | |
543 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
544 | */ | |
83b11340 | 545 | __be32 |
1da177e4 LT |
546 | fh_update(struct svc_fh *fhp) |
547 | { | |
548 | struct dentry *dentry; | |
982aedfd | 549 | |
1da177e4 LT |
550 | if (!fhp->fh_dentry) |
551 | goto out_bad; | |
552 | ||
553 | dentry = fhp->fh_dentry; | |
554 | if (!dentry->d_inode) | |
555 | goto out_negative; | |
556 | if (fhp->fh_handle.fh_version != 1) { | |
557 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
558 | } else { | |
6e91ea2b | 559 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 560 | goto out; |
6e91ea2b CH |
561 | |
562 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
563 | if (fhp->fh_handle.fh_fileid_type == 255) |
564 | return nfserr_opnotsupp; | |
565 | } | |
566 | out: | |
567 | return 0; | |
568 | ||
569 | out_bad: | |
570 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
571 | goto out; | |
572 | out_negative: | |
573 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
574 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
575 | goto out; | |
1da177e4 LT |
576 | } |
577 | ||
578 | /* | |
579 | * Release a file handle. | |
580 | */ | |
581 | void | |
582 | fh_put(struct svc_fh *fhp) | |
583 | { | |
584 | struct dentry * dentry = fhp->fh_dentry; | |
585 | struct svc_export * exp = fhp->fh_export; | |
586 | if (dentry) { | |
587 | fh_unlock(fhp); | |
588 | fhp->fh_dentry = NULL; | |
589 | dput(dentry); | |
590 | #ifdef CONFIG_NFSD_V3 | |
591 | fhp->fh_pre_saved = 0; | |
592 | fhp->fh_post_saved = 0; | |
593 | #endif | |
594 | nfsd_nr_put++; | |
595 | } | |
596 | if (exp) { | |
baab935f | 597 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
598 | fhp->fh_export = NULL; |
599 | } | |
600 | return; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Shorthand for dprintk()'s | |
605 | */ | |
606 | char * SVCFH_fmt(struct svc_fh *fhp) | |
607 | { | |
608 | struct knfsd_fh *fh = &fhp->fh_handle; | |
609 | ||
610 | static char buf[80]; | |
611 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
612 | fh->fh_size, | |
613 | fh->fh_base.fh_pad[0], | |
614 | fh->fh_base.fh_pad[1], | |
615 | fh->fh_base.fh_pad[2], | |
616 | fh->fh_base.fh_pad[3], | |
617 | fh->fh_base.fh_pad[4], | |
618 | fh->fh_base.fh_pad[5]); | |
619 | return buf; | |
620 | } | |
af6a4e28 N |
621 | |
622 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
623 | { | |
624 | if (fhp->fh_handle.fh_version != 1) | |
625 | return FSIDSOURCE_DEV; | |
626 | switch(fhp->fh_handle.fh_fsid_type) { | |
627 | case FSID_DEV: | |
628 | case FSID_ENCODE_DEV: | |
629 | case FSID_MAJOR_MINOR: | |
54775491 | 630 | if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b8da0d1c NB |
631 | & FS_REQUIRES_DEV) |
632 | return FSIDSOURCE_DEV; | |
633 | break; | |
af6a4e28 | 634 | case FSID_NUM: |
af6a4e28 N |
635 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
636 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
637 | break; |
638 | default: | |
639 | break; | |
af6a4e28 | 640 | } |
b8da0d1c NB |
641 | /* either a UUID type filehandle, or the filehandle doesn't |
642 | * match the export. | |
643 | */ | |
644 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
645 | return FSIDSOURCE_FSID; | |
646 | if (fhp->fh_export->ex_uuid) | |
647 | return FSIDSOURCE_UUID; | |
648 | return FSIDSOURCE_DEV; | |
af6a4e28 | 649 | } |