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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 | ||
1da177e4 LT |
30 | /* |
31 | * our acceptability function. | |
32 | * if NOSUBTREECHECK, accept anything | |
33 | * if not, require that we can walk up to exp->ex_dentry | |
34 | * doing some checks on the 'x' bits | |
35 | */ | |
36 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
37 | { | |
38 | struct svc_export *exp = expv; | |
39 | int rv; | |
40 | struct dentry *tdentry; | |
41 | struct dentry *parent; | |
42 | ||
43 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
44 | return 1; | |
45 | ||
46 | tdentry = dget(dentry); | |
54775491 | 47 | while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { |
1da177e4 LT |
48 | /* make sure parents give x permission to user */ |
49 | int err; | |
50 | parent = dget_parent(tdentry); | |
f419a2e3 | 51 | err = inode_permission(parent->d_inode, MAY_EXEC); |
1da177e4 LT |
52 | if (err < 0) { |
53 | dput(parent); | |
54 | break; | |
55 | } | |
56 | dput(tdentry); | |
57 | tdentry = parent; | |
58 | } | |
54775491 | 59 | if (tdentry != exp->ex_path.dentry) |
1da177e4 | 60 | dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); |
54775491 | 61 | rv = (tdentry == exp->ex_path.dentry); |
1da177e4 LT |
62 | dput(tdentry); |
63 | return rv; | |
64 | } | |
65 | ||
66 | /* Type check. The correct error return for type mismatches does not seem to be | |
67 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
68 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
69 | * the write call). | |
70 | */ | |
83b11340 | 71 | static inline __be32 |
1da177e4 LT |
72 | nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type) |
73 | { | |
74 | /* Type can be negative when creating hardlinks - not to a dir */ | |
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_notdir; | |
80 | else if ((mode & S_IFMT) == S_IFDIR) | |
81 | return nfserr_isdir; | |
82 | else | |
83 | return nfserr_inval; | |
84 | } | |
85 | if (type < 0 && (mode & S_IFMT) == -type) { | |
86 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
87 | return nfserr_symlink; | |
88 | else if (type == -S_IFDIR) | |
89 | return nfserr_isdir; | |
90 | else | |
91 | return nfserr_notdir; | |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
6fa02839 BF |
96 | static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, |
97 | struct svc_export *exp) | |
98 | { | |
99 | /* Check if the request originated from a secure port. */ | |
100 | if (!rqstp->rq_secure && EX_SECURE(exp)) { | |
5216a8e7 | 101 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
6fa02839 BF |
102 | dprintk(KERN_WARNING |
103 | "nfsd: request from insecure port %s!\n", | |
104 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
105 | return nfserr_perm; | |
106 | } | |
107 | ||
108 | /* Set user creds for this exportpoint */ | |
109 | return nfserrno(nfsd_setuser(rqstp, exp)); | |
110 | } | |
111 | ||
03550fac BF |
112 | /* |
113 | * Use the given filehandle to look up the corresponding export and | |
114 | * dentry. On success, the results are used to set fh_export and | |
115 | * fh_dentry. | |
116 | */ | |
117 | static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
118 | { | |
119 | struct knfsd_fh *fh = &fhp->fh_handle; | |
120 | struct fid *fid = NULL, sfid; | |
121 | struct svc_export *exp; | |
122 | struct dentry *dentry; | |
123 | int fileid_type; | |
124 | int data_left = fh->fh_size/4; | |
125 | __be32 error; | |
126 | ||
127 | error = nfserr_stale; | |
128 | if (rqstp->rq_vers > 2) | |
129 | error = nfserr_badhandle; | |
130 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
131 | return nfserr_nofilehandle; | |
132 | ||
133 | if (fh->fh_version == 1) { | |
134 | int len; | |
135 | ||
136 | if (--data_left < 0) | |
137 | return error; | |
138 | if (fh->fh_auth_type != 0) | |
139 | return error; | |
140 | len = key_len(fh->fh_fsid_type) / 4; | |
141 | if (len == 0) | |
142 | return error; | |
143 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { | |
144 | /* deprecated, convert to type 3 */ | |
145 | len = key_len(FSID_ENCODE_DEV)/4; | |
146 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
147 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); | |
148 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
149 | } | |
150 | data_left -= len; | |
151 | if (data_left < 0) | |
152 | return error; | |
153 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth); | |
154 | fid = (struct fid *)(fh->fh_auth + len); | |
155 | } else { | |
156 | __u32 tfh[2]; | |
157 | dev_t xdev; | |
158 | ino_t xino; | |
159 | ||
160 | if (fh->fh_size != NFS_FHSIZE) | |
161 | return error; | |
162 | /* assume old filehandle format */ | |
163 | xdev = old_decode_dev(fh->ofh_xdev); | |
164 | xino = u32_to_ino_t(fh->ofh_xino); | |
165 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); | |
166 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); | |
167 | } | |
168 | ||
169 | error = nfserr_stale; | |
170 | if (PTR_ERR(exp) == -ENOENT) | |
171 | return error; | |
172 | ||
173 | if (IS_ERR(exp)) | |
174 | return nfserrno(PTR_ERR(exp)); | |
175 | ||
496d6c32 NB |
176 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
177 | /* Elevate privileges so that the lack of 'r' or 'x' | |
178 | * permission on some parent directory will | |
179 | * not stop exportfs_decode_fh from being able | |
180 | * to reconnect a directory into the dentry cache. | |
181 | * The same problem can affect "SUBTREECHECK" exports, | |
182 | * but as nfsd_acceptable depends on correct | |
183 | * access control settings being in effect, we cannot | |
184 | * fix that case easily. | |
185 | */ | |
d84f4f99 DH |
186 | struct cred *new = prepare_creds(); |
187 | if (!new) | |
188 | return nfserrno(-ENOMEM); | |
189 | new->cap_effective = | |
190 | cap_raise_nfsd_set(new->cap_effective, | |
191 | new->cap_permitted); | |
192 | put_cred(override_creds(new)); | |
193 | put_cred(new); | |
496d6c32 NB |
194 | } else { |
195 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
196 | if (error) | |
197 | goto out; | |
198 | } | |
03550fac BF |
199 | |
200 | /* | |
201 | * Look up the dentry using the NFS file handle. | |
202 | */ | |
203 | error = nfserr_stale; | |
204 | if (rqstp->rq_vers > 2) | |
205 | error = nfserr_badhandle; | |
206 | ||
207 | if (fh->fh_version != 1) { | |
208 | sfid.i32.ino = fh->ofh_ino; | |
209 | sfid.i32.gen = fh->ofh_generation; | |
210 | sfid.i32.parent_ino = fh->ofh_dirino; | |
211 | fid = &sfid; | |
212 | data_left = 3; | |
213 | if (fh->ofh_dirino == 0) | |
214 | fileid_type = FILEID_INO32_GEN; | |
215 | else | |
216 | fileid_type = FILEID_INO32_GEN_PARENT; | |
217 | } else | |
218 | fileid_type = fh->fh_fileid_type; | |
219 | ||
220 | if (fileid_type == FILEID_ROOT) | |
221 | dentry = dget(exp->ex_path.dentry); | |
222 | else { | |
223 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, | |
224 | data_left, fileid_type, | |
225 | nfsd_acceptable, exp); | |
226 | } | |
227 | if (dentry == NULL) | |
228 | goto out; | |
229 | if (IS_ERR(dentry)) { | |
230 | if (PTR_ERR(dentry) != -EINVAL) | |
231 | error = nfserrno(PTR_ERR(dentry)); | |
232 | goto out; | |
233 | } | |
234 | ||
496d6c32 NB |
235 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { |
236 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
237 | if (error) { | |
238 | dput(dentry); | |
239 | goto out; | |
240 | } | |
241 | } | |
242 | ||
03550fac BF |
243 | if (S_ISDIR(dentry->d_inode->i_mode) && |
244 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
245 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
246 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
247 | } | |
248 | ||
249 | fhp->fh_dentry = dentry; | |
250 | fhp->fh_export = exp; | |
03550fac BF |
251 | return 0; |
252 | out: | |
253 | exp_put(exp); | |
254 | return error; | |
255 | } | |
256 | ||
b3d47676 BF |
257 | /** |
258 | * fh_verify - filehandle lookup and access checking | |
259 | * @rqstp: pointer to current rpc request | |
260 | * @fhp: filehandle to be verified | |
261 | * @type: expected type of object pointed to by filehandle | |
262 | * @access: type of access needed to object | |
263 | * | |
264 | * Look up a dentry from the on-the-wire filehandle, check the client's | |
265 | * access to the export, and set the current task's credentials. | |
266 | * | |
267 | * Regardless of success or failure of fh_verify(), fh_put() should be | |
268 | * called on @fhp when the caller is finished with the filehandle. | |
269 | * | |
270 | * fh_verify() may be called multiple times on a given filehandle, for | |
271 | * example, when processing an NFSv4 compound. The first call will look | |
272 | * up a dentry using the on-the-wire filehandle. Subsequent calls will | |
273 | * skip the lookup and just perform the other checks and possibly change | |
274 | * the current task's credentials. | |
1da177e4 | 275 | * |
b3d47676 BF |
276 | * @type specifies the type of object expected using one of the S_IF* |
277 | * constants defined in include/linux/stat.h. The caller may use zero | |
278 | * to indicate that it doesn't care, or a negative integer to indicate | |
279 | * that it expects something not of the given type. | |
1da177e4 | 280 | * |
b3d47676 BF |
281 | * @access is formed from the NFSD_MAY_* constants defined in |
282 | * include/linux/nfsd/nfsd.h. | |
1da177e4 | 283 | */ |
83b11340 | 284 | __be32 |
1da177e4 LT |
285 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
286 | { | |
03550fac | 287 | struct svc_export *exp; |
1da177e4 | 288 | struct dentry *dentry; |
03550fac | 289 | __be32 error; |
1da177e4 LT |
290 | |
291 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
292 | ||
1da177e4 | 293 | if (!fhp->fh_dentry) { |
03550fac | 294 | error = nfsd_set_fh_dentry(rqstp, fhp); |
d1bbf14f N |
295 | if (error) |
296 | goto out; | |
03550fac BF |
297 | dentry = fhp->fh_dentry; |
298 | exp = fhp->fh_export; | |
1da177e4 | 299 | } else { |
6fa02839 BF |
300 | /* |
301 | * just rechecking permissions | |
302 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create | |
303 | * does as well) | |
1da177e4 LT |
304 | */ |
305 | dprintk("nfsd: fh_verify - just checking\n"); | |
306 | dentry = fhp->fh_dentry; | |
307 | exp = fhp->fh_export; | |
6fa02839 BF |
308 | /* |
309 | * Set user creds for this exportpoint; necessary even | |
d1bbf14f N |
310 | * in the "just checking" case because this may be a |
311 | * filehandle that was created by fh_compose, and that | |
312 | * is about to be used in another nfsv4 compound | |
6fa02839 BF |
313 | * operation. |
314 | */ | |
315 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
d1bbf14f N |
316 | if (error) |
317 | goto out; | |
1da177e4 | 318 | } |
7fc90ec9 | 319 | |
1da177e4 LT |
320 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
321 | if (error) | |
322 | goto out; | |
323 | ||
04716e66 BF |
324 | /* |
325 | * pseudoflavor restrictions are not enforced on NLM, | |
326 | * which clients virtually always use auth_sys for, | |
327 | * even while using RPCSEC_GSS for NFS. | |
328 | */ | |
329 | if (access & NFSD_MAY_LOCK) | |
330 | goto skip_pseudoflavor_check; | |
331 | /* | |
332 | * Clients may expect to be able to use auth_sys during mount, | |
333 | * even if they use gss for everything else; see section 2.3.2 | |
334 | * of rfc 2623. | |
335 | */ | |
336 | if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT | |
337 | && exp->ex_path.dentry == dentry) | |
338 | goto skip_pseudoflavor_check; | |
339 | ||
340 | error = check_nfsd_access(exp, rqstp); | |
341 | if (error) | |
342 | goto out; | |
32c1eb0c | 343 | |
04716e66 | 344 | skip_pseudoflavor_check: |
1da177e4 | 345 | /* Finally, check access permissions. */ |
0ec757df | 346 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 347 | |
1da177e4 | 348 | if (error) { |
34e9a63b N |
349 | dprintk("fh_verify: %s/%s permission failure, " |
350 | "acc=%x, error=%d\n", | |
351 | dentry->d_parent->d_name.name, | |
352 | dentry->d_name.name, | |
fc2dd2e5 | 353 | access, ntohl(error)); |
1da177e4 | 354 | } |
1da177e4 | 355 | out: |
1da177e4 LT |
356 | if (error == nfserr_stale) |
357 | nfsdstats.fh_stale++; | |
358 | return error; | |
359 | } | |
360 | ||
361 | ||
362 | /* | |
363 | * Compose a file handle for an NFS reply. | |
364 | * | |
365 | * Note that when first composed, the dentry may not yet have | |
366 | * an inode. In this case a call to fh_update should be made | |
367 | * before the fh goes out on the wire ... | |
368 | */ | |
6e91ea2b CH |
369 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
370 | struct dentry *dentry) | |
1da177e4 | 371 | { |
54775491 | 372 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
373 | struct fid *fid = (struct fid *) |
374 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
375 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
376 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 377 | |
6e91ea2b CH |
378 | fhp->fh_handle.fh_fileid_type = |
379 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
380 | fhp->fh_handle.fh_size += maxsize * 4; | |
381 | } else { | |
382 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
383 | } | |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
387 | * for composing old style file handles | |
388 | */ | |
389 | static inline void _fh_update_old(struct dentry *dentry, | |
390 | struct svc_export *exp, | |
391 | struct knfsd_fh *fh) | |
392 | { | |
393 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
394 | fh->ofh_generation = dentry->d_inode->i_generation; | |
395 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
396 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
397 | fh->ofh_dirino = 0; | |
398 | } | |
399 | ||
8e498751 BF |
400 | static bool is_root_export(struct svc_export *exp) |
401 | { | |
402 | return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; | |
403 | } | |
404 | ||
405 | static struct super_block *exp_sb(struct svc_export *exp) | |
406 | { | |
407 | return exp->ex_path.dentry->d_inode->i_sb; | |
408 | } | |
409 | ||
410 | static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) | |
411 | { | |
412 | switch (fsid_type) { | |
413 | case FSID_DEV: | |
414 | if (!old_valid_dev(exp_sb(exp)->s_dev)) | |
415 | return 0; | |
416 | /* FALL THROUGH */ | |
417 | case FSID_MAJOR_MINOR: | |
418 | case FSID_ENCODE_DEV: | |
419 | return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; | |
420 | case FSID_NUM: | |
421 | return exp->ex_flags & NFSEXP_FSID; | |
422 | case FSID_UUID8: | |
423 | case FSID_UUID16: | |
424 | if (!is_root_export(exp)) | |
425 | return 0; | |
426 | /* fall through */ | |
427 | case FSID_UUID4_INUM: | |
428 | case FSID_UUID16_INUM: | |
429 | return exp->ex_uuid != NULL; | |
430 | } | |
431 | return 1; | |
432 | } | |
433 | ||
1da177e4 | 434 | |
bc6c53d5 BF |
435 | static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) |
436 | { | |
b41eeef1 | 437 | u8 version; |
bc6c53d5 BF |
438 | u8 fsid_type; |
439 | retry: | |
b41eeef1 | 440 | version = 1; |
7e405364 | 441 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 442 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
443 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
444 | ||
b41eeef1 N |
445 | ref_fh = NULL; |
446 | ||
447 | switch (version) { | |
448 | case 0xca: | |
af6a4e28 | 449 | fsid_type = FSID_DEV; |
b41eeef1 N |
450 | break; |
451 | case 1: | |
452 | break; | |
453 | default: | |
454 | goto retry; | |
455 | } | |
456 | ||
8e498751 BF |
457 | /* |
458 | * As the fsid -> filesystem mapping was guided by | |
459 | * user-space, there is no guarantee that the filesystem | |
460 | * actually supports that fsid type. If it doesn't we | |
461 | * loop around again without ref_fh set. | |
982aedfd | 462 | */ |
8e498751 BF |
463 | if (!fsid_type_ok_for_exp(fsid_type, exp)) |
464 | goto retry; | |
30fa8c01 SD |
465 | } else if (exp->ex_flags & NFSEXP_FSID) { |
466 | fsid_type = FSID_NUM; | |
af6a4e28 N |
467 | } else if (exp->ex_uuid) { |
468 | if (fhp->fh_maxsize >= 64) { | |
8e498751 | 469 | if (is_root_export(exp)) |
af6a4e28 N |
470 | fsid_type = FSID_UUID16; |
471 | else | |
472 | fsid_type = FSID_UUID16_INUM; | |
473 | } else { | |
8e498751 | 474 | if (is_root_export(exp)) |
af6a4e28 N |
475 | fsid_type = FSID_UUID8; |
476 | else | |
477 | fsid_type = FSID_UUID4_INUM; | |
478 | } | |
bc6c53d5 | 479 | } else if (!old_valid_dev(exp_sb(exp)->s_dev)) |
1da177e4 | 480 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 481 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 482 | else |
af6a4e28 | 483 | fsid_type = FSID_DEV; |
bc6c53d5 BF |
484 | fhp->fh_handle.fh_version = version; |
485 | if (version) | |
486 | fhp->fh_handle.fh_fsid_type = fsid_type; | |
487 | } | |
488 | ||
489 | __be32 | |
490 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, | |
491 | struct svc_fh *ref_fh) | |
492 | { | |
493 | /* ref_fh is a reference file handle. | |
494 | * if it is non-null and for the same filesystem, then we should compose | |
495 | * a filehandle which is of the same version, where possible. | |
496 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca | |
497 | * Then create a 32byte filehandle using nfs_fhbase_old | |
498 | * | |
499 | */ | |
500 | ||
501 | struct inode * inode = dentry->d_inode; | |
502 | struct dentry *parent = dentry->d_parent; | |
503 | __u32 *datap; | |
504 | dev_t ex_dev = exp_sb(exp)->s_dev; | |
505 | ||
506 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
507 | MAJOR(ex_dev), MINOR(ex_dev), | |
508 | (long) exp->ex_path.dentry->d_inode->i_ino, | |
509 | parent->d_name.name, dentry->d_name.name, | |
510 | (inode ? inode->i_ino : 0)); | |
511 | ||
512 | /* Choose filehandle version and fsid type based on | |
513 | * the reference filehandle (if it is in the same export) | |
514 | * or the export options. | |
515 | */ | |
516 | set_version_and_fsid_type(fhp, exp, ref_fh); | |
1da177e4 LT |
517 | |
518 | if (ref_fh == fhp) | |
519 | fh_put(ref_fh); | |
520 | ||
521 | if (fhp->fh_locked || fhp->fh_dentry) { | |
522 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 523 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
524 | } |
525 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
526 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
527 | fhp->fh_maxsize, |
528 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
529 | |
530 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
531 | fhp->fh_export = exp; | |
532 | cache_get(&exp->h); | |
533 | ||
bc6c53d5 | 534 | if (fhp->fh_handle.fh_version == 0xca) { |
1da177e4 LT |
535 | /* old style filehandle please */ |
536 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
537 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
538 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
539 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
540 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 541 | fhp->fh_handle.ofh_xino = |
54775491 | 542 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
543 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
544 | if (inode) | |
545 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
546 | } else { | |
547 | int len; | |
1da177e4 LT |
548 | fhp->fh_handle.fh_auth_type = 0; |
549 | datap = fhp->fh_handle.fh_auth+0; | |
bc6c53d5 | 550 | mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev, |
54775491 | 551 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
552 | exp->ex_fsid, exp->ex_uuid); |
553 | ||
bc6c53d5 | 554 | len = key_len(fhp->fh_handle.fh_fsid_type); |
1da177e4 LT |
555 | datap += len/4; |
556 | fhp->fh_handle.fh_size = 4 + len; | |
557 | ||
6e91ea2b CH |
558 | if (inode) |
559 | _fh_update(fhp, exp, dentry); | |
1be10a88 BF |
560 | if (fhp->fh_handle.fh_fileid_type == 255) { |
561 | fh_put(fhp); | |
1da177e4 | 562 | return nfserr_opnotsupp; |
1be10a88 | 563 | } |
1da177e4 LT |
564 | } |
565 | ||
1da177e4 LT |
566 | return 0; |
567 | } | |
568 | ||
569 | /* | |
570 | * Update file handle information after changing a dentry. | |
571 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
572 | */ | |
83b11340 | 573 | __be32 |
1da177e4 LT |
574 | fh_update(struct svc_fh *fhp) |
575 | { | |
576 | struct dentry *dentry; | |
982aedfd | 577 | |
1da177e4 LT |
578 | if (!fhp->fh_dentry) |
579 | goto out_bad; | |
580 | ||
581 | dentry = fhp->fh_dentry; | |
582 | if (!dentry->d_inode) | |
583 | goto out_negative; | |
584 | if (fhp->fh_handle.fh_version != 1) { | |
585 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
586 | } else { | |
6e91ea2b | 587 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 588 | goto out; |
6e91ea2b CH |
589 | |
590 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
591 | if (fhp->fh_handle.fh_fileid_type == 255) |
592 | return nfserr_opnotsupp; | |
593 | } | |
594 | out: | |
595 | return 0; | |
596 | ||
597 | out_bad: | |
598 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
599 | goto out; | |
600 | out_negative: | |
601 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
602 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
603 | goto out; | |
1da177e4 LT |
604 | } |
605 | ||
606 | /* | |
607 | * Release a file handle. | |
608 | */ | |
609 | void | |
610 | fh_put(struct svc_fh *fhp) | |
611 | { | |
612 | struct dentry * dentry = fhp->fh_dentry; | |
613 | struct svc_export * exp = fhp->fh_export; | |
614 | if (dentry) { | |
615 | fh_unlock(fhp); | |
616 | fhp->fh_dentry = NULL; | |
617 | dput(dentry); | |
618 | #ifdef CONFIG_NFSD_V3 | |
619 | fhp->fh_pre_saved = 0; | |
620 | fhp->fh_post_saved = 0; | |
621 | #endif | |
1da177e4 LT |
622 | } |
623 | if (exp) { | |
baab935f | 624 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
625 | fhp->fh_export = NULL; |
626 | } | |
627 | return; | |
628 | } | |
629 | ||
630 | /* | |
631 | * Shorthand for dprintk()'s | |
632 | */ | |
633 | char * SVCFH_fmt(struct svc_fh *fhp) | |
634 | { | |
635 | struct knfsd_fh *fh = &fhp->fh_handle; | |
636 | ||
637 | static char buf[80]; | |
638 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
639 | fh->fh_size, | |
640 | fh->fh_base.fh_pad[0], | |
641 | fh->fh_base.fh_pad[1], | |
642 | fh->fh_base.fh_pad[2], | |
643 | fh->fh_base.fh_pad[3], | |
644 | fh->fh_base.fh_pad[4], | |
645 | fh->fh_base.fh_pad[5]); | |
646 | return buf; | |
647 | } | |
af6a4e28 N |
648 | |
649 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
650 | { | |
651 | if (fhp->fh_handle.fh_version != 1) | |
652 | return FSIDSOURCE_DEV; | |
653 | switch(fhp->fh_handle.fh_fsid_type) { | |
654 | case FSID_DEV: | |
655 | case FSID_ENCODE_DEV: | |
656 | case FSID_MAJOR_MINOR: | |
8e498751 | 657 | if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) |
b8da0d1c NB |
658 | return FSIDSOURCE_DEV; |
659 | break; | |
af6a4e28 | 660 | case FSID_NUM: |
af6a4e28 N |
661 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
662 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
663 | break; |
664 | default: | |
665 | break; | |
af6a4e28 | 666 | } |
b8da0d1c NB |
667 | /* either a UUID type filehandle, or the filehandle doesn't |
668 | * match the export. | |
669 | */ | |
670 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
671 | return FSIDSOURCE_FSID; | |
672 | if (fhp->fh_export->ex_uuid) | |
673 | return FSIDSOURCE_UUID; | |
674 | return FSIDSOURCE_DEV; | |
af6a4e28 | 675 | } |