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 LT |
22 | #include <linux/sunrpc/svc.h> |
23 | #include <linux/nfsd/nfsd.h> | |
24 | ||
25 | #define NFSDDBG_FACILITY NFSDDBG_FH | |
1da177e4 LT |
26 | |
27 | ||
28 | static int nfsd_nr_verified; | |
29 | static int nfsd_nr_put; | |
30 | ||
1da177e4 LT |
31 | /* |
32 | * our acceptability function. | |
33 | * if NOSUBTREECHECK, accept anything | |
34 | * if not, require that we can walk up to exp->ex_dentry | |
35 | * doing some checks on the 'x' bits | |
36 | */ | |
37 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
38 | { | |
39 | struct svc_export *exp = expv; | |
40 | int rv; | |
41 | struct dentry *tdentry; | |
42 | struct dentry *parent; | |
43 | ||
44 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
45 | return 1; | |
46 | ||
47 | tdentry = dget(dentry); | |
48 | while (tdentry != exp->ex_dentry && ! IS_ROOT(tdentry)) { | |
49 | /* make sure parents give x permission to user */ | |
50 | int err; | |
51 | parent = dget_parent(tdentry); | |
52 | err = permission(parent->d_inode, MAY_EXEC, NULL); | |
53 | if (err < 0) { | |
54 | dput(parent); | |
55 | break; | |
56 | } | |
57 | dput(tdentry); | |
58 | tdentry = parent; | |
59 | } | |
60 | if (tdentry != exp->ex_dentry) | |
61 | dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); | |
62 | rv = (tdentry == exp->ex_dentry); | |
63 | dput(tdentry); | |
64 | return rv; | |
65 | } | |
66 | ||
67 | /* Type check. The correct error return for type mismatches does not seem to be | |
68 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
69 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
70 | * the write call). | |
71 | */ | |
83b11340 | 72 | static inline __be32 |
1da177e4 LT |
73 | nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type) |
74 | { | |
75 | /* Type can be negative when creating hardlinks - not to a dir */ | |
76 | if (type > 0 && (mode & S_IFMT) != type) { | |
77 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
78 | return nfserr_symlink; | |
79 | else if (type == S_IFDIR) | |
80 | return nfserr_notdir; | |
81 | else if ((mode & S_IFMT) == S_IFDIR) | |
82 | return nfserr_isdir; | |
83 | else | |
84 | return nfserr_inval; | |
85 | } | |
86 | if (type < 0 && (mode & S_IFMT) == -type) { | |
87 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
88 | return nfserr_symlink; | |
89 | else if (type == -S_IFDIR) | |
90 | return nfserr_isdir; | |
91 | else | |
92 | return nfserr_notdir; | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Perform sanity checks on the dentry in a client's file handle. | |
99 | * | |
100 | * Note that the file handle dentry may need to be freed even after | |
101 | * an error return. | |
102 | * | |
103 | * This is only called at the start of an nfsproc call, so fhp points to | |
104 | * a svc_fh which is all 0 except for the over-the-wire file handle. | |
105 | */ | |
83b11340 | 106 | __be32 |
1da177e4 LT |
107 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
108 | { | |
109 | struct knfsd_fh *fh = &fhp->fh_handle; | |
110 | struct svc_export *exp = NULL; | |
111 | struct dentry *dentry; | |
83b11340 | 112 | __be32 error = 0; |
1da177e4 LT |
113 | |
114 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
115 | ||
1da177e4 LT |
116 | if (!fhp->fh_dentry) { |
117 | __u32 *datap=NULL; | |
118 | __u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */ | |
119 | int fileid_type; | |
120 | int data_left = fh->fh_size/4; | |
121 | ||
122 | error = nfserr_stale; | |
123 | if (rqstp->rq_client == NULL) | |
124 | goto out; | |
125 | if (rqstp->rq_vers > 2) | |
126 | error = nfserr_badhandle; | |
127 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
128 | return nfserr_nofilehandle; | |
129 | ||
130 | if (fh->fh_version == 1) { | |
131 | int len; | |
132 | datap = fh->fh_auth; | |
133 | if (--data_left<0) goto out; | |
134 | switch (fh->fh_auth_type) { | |
135 | case 0: break; | |
136 | default: goto out; | |
137 | } | |
138 | len = key_len(fh->fh_fsid_type) / 4; | |
139 | if (len == 0) goto out; | |
af6a4e28 | 140 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { |
1da177e4 | 141 | /* deprecated, convert to type 3 */ |
af6a4e28 N |
142 | len = key_len(FSID_ENCODE_DEV)/4; |
143 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
1da177e4 LT |
144 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); |
145 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
146 | } | |
147 | if ((data_left -= len)<0) goto out; | |
0989a788 | 148 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, datap); |
1da177e4 LT |
149 | datap += len; |
150 | } else { | |
151 | dev_t xdev; | |
152 | ino_t xino; | |
153 | if (fh->fh_size != NFS_FHSIZE) | |
154 | goto out; | |
155 | /* assume old filehandle format */ | |
156 | xdev = old_decode_dev(fh->ofh_xdev); | |
157 | xino = u32_to_ino_t(fh->ofh_xino); | |
af6a4e28 | 158 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); |
0989a788 | 159 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); |
1da177e4 LT |
160 | } |
161 | ||
2d3bb252 BF |
162 | error = nfserr_stale; |
163 | if (PTR_ERR(exp) == -ENOENT) | |
1da177e4 LT |
164 | goto out; |
165 | ||
2d3bb252 BF |
166 | if (IS_ERR(exp)) { |
167 | error = nfserrno(PTR_ERR(exp)); | |
1da177e4 | 168 | goto out; |
2d3bb252 | 169 | } |
1da177e4 LT |
170 | |
171 | /* Check if the request originated from a secure port. */ | |
172 | error = nfserr_perm; | |
173 | if (!rqstp->rq_secure && EX_SECURE(exp)) { | |
ad06e4bd | 174 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 | 175 | printk(KERN_WARNING |
ad06e4bd CL |
176 | "nfsd: request from insecure port %s!\n", |
177 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 LT |
178 | goto out; |
179 | } | |
180 | ||
d1bbf14f N |
181 | /* Set user creds for this exportpoint */ |
182 | error = nfserrno(nfsd_setuser(rqstp, exp)); | |
183 | if (error) | |
184 | goto out; | |
185 | ||
1da177e4 LT |
186 | /* |
187 | * Look up the dentry using the NFS file handle. | |
188 | */ | |
189 | error = nfserr_stale; | |
190 | if (rqstp->rq_vers > 2) | |
191 | error = nfserr_badhandle; | |
192 | ||
193 | if (fh->fh_version != 1) { | |
194 | tfh[0] = fh->ofh_ino; | |
195 | tfh[1] = fh->ofh_generation; | |
196 | tfh[2] = fh->ofh_dirino; | |
197 | datap = tfh; | |
198 | data_left = 3; | |
199 | if (fh->ofh_dirino == 0) | |
200 | fileid_type = 1; | |
201 | else | |
202 | fileid_type = 2; | |
203 | } else | |
204 | fileid_type = fh->fh_fileid_type; | |
982aedfd | 205 | |
1da177e4 LT |
206 | if (fileid_type == 0) |
207 | dentry = dget(exp->ex_dentry); | |
208 | else { | |
d37065cd CH |
209 | dentry = exportfs_decode_fh(exp->ex_mnt, datap, |
210 | data_left, fileid_type, | |
211 | nfsd_acceptable, exp); | |
1da177e4 LT |
212 | } |
213 | if (dentry == NULL) | |
214 | goto out; | |
215 | if (IS_ERR(dentry)) { | |
216 | if (PTR_ERR(dentry) != -EINVAL) | |
217 | error = nfserrno(PTR_ERR(dentry)); | |
218 | goto out; | |
219 | } | |
34e9a63b | 220 | |
1da177e4 LT |
221 | if (S_ISDIR(dentry->d_inode->i_mode) && |
222 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
223 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
224 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
225 | } | |
1da177e4 LT |
226 | |
227 | fhp->fh_dentry = dentry; | |
228 | fhp->fh_export = exp; | |
229 | nfsd_nr_verified++; | |
230 | } else { | |
231 | /* just rechecking permissions | |
232 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well) | |
233 | */ | |
234 | dprintk("nfsd: fh_verify - just checking\n"); | |
235 | dentry = fhp->fh_dentry; | |
236 | exp = fhp->fh_export; | |
d1bbf14f N |
237 | /* Set user creds for this exportpoint; necessary even |
238 | * in the "just checking" case because this may be a | |
239 | * filehandle that was created by fh_compose, and that | |
240 | * is about to be used in another nfsv4 compound | |
241 | * operation */ | |
242 | error = nfserrno(nfsd_setuser(rqstp, exp)); | |
243 | if (error) | |
244 | goto out; | |
1da177e4 LT |
245 | } |
246 | cache_get(&exp->h); | |
247 | ||
7fc90ec9 | 248 | |
1da177e4 LT |
249 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
250 | if (error) | |
251 | goto out; | |
252 | ||
253 | /* Finally, check access permissions. */ | |
254 | error = nfsd_permission(exp, dentry, access); | |
255 | ||
1da177e4 | 256 | if (error) { |
34e9a63b N |
257 | dprintk("fh_verify: %s/%s permission failure, " |
258 | "acc=%x, error=%d\n", | |
259 | dentry->d_parent->d_name.name, | |
260 | dentry->d_name.name, | |
fc2dd2e5 | 261 | access, ntohl(error)); |
1da177e4 | 262 | } |
1da177e4 LT |
263 | out: |
264 | if (exp && !IS_ERR(exp)) | |
265 | exp_put(exp); | |
266 | if (error == nfserr_stale) | |
267 | nfsdstats.fh_stale++; | |
268 | return error; | |
269 | } | |
270 | ||
271 | ||
272 | /* | |
273 | * Compose a file handle for an NFS reply. | |
274 | * | |
275 | * Note that when first composed, the dentry may not yet have | |
276 | * an inode. In this case a call to fh_update should be made | |
277 | * before the fh goes out on the wire ... | |
278 | */ | |
279 | static inline int _fh_update(struct dentry *dentry, struct svc_export *exp, | |
280 | __u32 *datap, int *maxsize) | |
281 | { | |
1da177e4 LT |
282 | if (dentry == exp->ex_dentry) { |
283 | *maxsize = 0; | |
284 | return 0; | |
285 | } | |
286 | ||
d37065cd CH |
287 | return exportfs_encode_fh(dentry, datap, maxsize, |
288 | !(exp->ex_flags & NFSEXP_NOSUBTREECHECK)); | |
1da177e4 LT |
289 | } |
290 | ||
291 | /* | |
292 | * for composing old style file handles | |
293 | */ | |
294 | static inline void _fh_update_old(struct dentry *dentry, | |
295 | struct svc_export *exp, | |
296 | struct knfsd_fh *fh) | |
297 | { | |
298 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
299 | fh->ofh_generation = dentry->d_inode->i_generation; | |
300 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
301 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
302 | fh->ofh_dirino = 0; | |
303 | } | |
304 | ||
83b11340 | 305 | __be32 |
982aedfd N |
306 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, |
307 | struct svc_fh *ref_fh) | |
1da177e4 LT |
308 | { |
309 | /* ref_fh is a reference file handle. | |
7e405364 N |
310 | * if it is non-null and for the same filesystem, then we should compose |
311 | * a filehandle which is of the same version, where possible. | |
1da177e4 LT |
312 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca |
313 | * Then create a 32byte filehandle using nfs_fhbase_old | |
314 | * | |
315 | */ | |
316 | ||
b41eeef1 | 317 | u8 version; |
982aedfd | 318 | u8 fsid_type = 0; |
1da177e4 LT |
319 | struct inode * inode = dentry->d_inode; |
320 | struct dentry *parent = dentry->d_parent; | |
321 | __u32 *datap; | |
322 | dev_t ex_dev = exp->ex_dentry->d_inode->i_sb->s_dev; | |
af6a4e28 | 323 | int root_export = (exp->ex_dentry == exp->ex_dentry->d_sb->s_root); |
1da177e4 LT |
324 | |
325 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
326 | MAJOR(ex_dev), MINOR(ex_dev), | |
327 | (long) exp->ex_dentry->d_inode->i_ino, | |
328 | parent->d_name.name, dentry->d_name.name, | |
329 | (inode ? inode->i_ino : 0)); | |
330 | ||
982aedfd N |
331 | /* Choose filehandle version and fsid type based on |
332 | * the reference filehandle (if it is in the same export) | |
333 | * or the export options. | |
334 | */ | |
b41eeef1 N |
335 | retry: |
336 | version = 1; | |
7e405364 | 337 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 338 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
339 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
340 | ||
341 | if (ref_fh == fhp) | |
342 | fh_put(ref_fh); | |
343 | ref_fh = NULL; | |
344 | ||
345 | switch (version) { | |
346 | case 0xca: | |
af6a4e28 | 347 | fsid_type = FSID_DEV; |
b41eeef1 N |
348 | break; |
349 | case 1: | |
350 | break; | |
351 | default: | |
352 | goto retry; | |
353 | } | |
354 | ||
355 | /* Need to check that this type works for this | |
356 | * export point. As the fsid -> filesystem mapping | |
357 | * was guided by user-space, there is no guarantee | |
358 | * that the filesystem actually supports that fsid | |
359 | * type. If it doesn't we loop around again without | |
360 | * ref_fh set. | |
982aedfd | 361 | */ |
b41eeef1 N |
362 | switch(fsid_type) { |
363 | case FSID_DEV: | |
364 | if (!old_valid_dev(ex_dev)) | |
365 | goto retry; | |
366 | /* FALL THROUGH */ | |
367 | case FSID_MAJOR_MINOR: | |
368 | case FSID_ENCODE_DEV: | |
369 | if (!(exp->ex_dentry->d_inode->i_sb->s_type->fs_flags | |
370 | & FS_REQUIRES_DEV)) | |
371 | goto retry; | |
372 | break; | |
373 | case FSID_NUM: | |
374 | if (! (exp->ex_flags & NFSEXP_FSID)) | |
375 | goto retry; | |
376 | break; | |
377 | case FSID_UUID8: | |
378 | case FSID_UUID16: | |
379 | if (!root_export) | |
380 | goto retry; | |
381 | /* fall through */ | |
382 | case FSID_UUID4_INUM: | |
383 | case FSID_UUID16_INUM: | |
384 | if (exp->ex_uuid == NULL) | |
385 | goto retry; | |
386 | break; | |
387 | } | |
af6a4e28 N |
388 | } else if (exp->ex_uuid) { |
389 | if (fhp->fh_maxsize >= 64) { | |
390 | if (root_export) | |
391 | fsid_type = FSID_UUID16; | |
392 | else | |
393 | fsid_type = FSID_UUID16_INUM; | |
394 | } else { | |
395 | if (root_export) | |
396 | fsid_type = FSID_UUID8; | |
397 | else | |
398 | fsid_type = FSID_UUID4_INUM; | |
399 | } | |
1da177e4 | 400 | } else if (exp->ex_flags & NFSEXP_FSID) |
af6a4e28 | 401 | fsid_type = FSID_NUM; |
982aedfd | 402 | else if (!old_valid_dev(ex_dev)) |
1da177e4 | 403 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 404 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 405 | else |
af6a4e28 | 406 | fsid_type = FSID_DEV; |
1da177e4 LT |
407 | |
408 | if (ref_fh == fhp) | |
409 | fh_put(ref_fh); | |
410 | ||
411 | if (fhp->fh_locked || fhp->fh_dentry) { | |
412 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 413 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
414 | } |
415 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
416 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
417 | fhp->fh_maxsize, |
418 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
419 | |
420 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
421 | fhp->fh_export = exp; | |
422 | cache_get(&exp->h); | |
423 | ||
982aedfd | 424 | if (version == 0xca) { |
1da177e4 LT |
425 | /* old style filehandle please */ |
426 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
427 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
428 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
429 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
430 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd N |
431 | fhp->fh_handle.ofh_xino = |
432 | ino_t_to_u32(exp->ex_dentry->d_inode->i_ino); | |
1da177e4 LT |
433 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
434 | if (inode) | |
435 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
436 | } else { | |
437 | int len; | |
438 | fhp->fh_handle.fh_version = 1; | |
439 | fhp->fh_handle.fh_auth_type = 0; | |
440 | datap = fhp->fh_handle.fh_auth+0; | |
982aedfd | 441 | fhp->fh_handle.fh_fsid_type = fsid_type; |
af6a4e28 N |
442 | mk_fsid(fsid_type, datap, ex_dev, |
443 | exp->ex_dentry->d_inode->i_ino, | |
444 | exp->ex_fsid, exp->ex_uuid); | |
445 | ||
982aedfd | 446 | len = key_len(fsid_type); |
1da177e4 LT |
447 | datap += len/4; |
448 | fhp->fh_handle.fh_size = 4 + len; | |
449 | ||
450 | if (inode) { | |
451 | int size = (fhp->fh_maxsize-len-4)/4; | |
452 | fhp->fh_handle.fh_fileid_type = | |
453 | _fh_update(dentry, exp, datap, &size); | |
454 | fhp->fh_handle.fh_size += size*4; | |
455 | } | |
456 | if (fhp->fh_handle.fh_fileid_type == 255) | |
457 | return nfserr_opnotsupp; | |
458 | } | |
459 | ||
460 | nfsd_nr_verified++; | |
461 | return 0; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Update file handle information after changing a dentry. | |
466 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
467 | */ | |
83b11340 | 468 | __be32 |
1da177e4 LT |
469 | fh_update(struct svc_fh *fhp) |
470 | { | |
471 | struct dentry *dentry; | |
472 | __u32 *datap; | |
982aedfd | 473 | |
1da177e4 LT |
474 | if (!fhp->fh_dentry) |
475 | goto out_bad; | |
476 | ||
477 | dentry = fhp->fh_dentry; | |
478 | if (!dentry->d_inode) | |
479 | goto out_negative; | |
480 | if (fhp->fh_handle.fh_version != 1) { | |
481 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
482 | } else { | |
483 | int size; | |
484 | if (fhp->fh_handle.fh_fileid_type != 0) | |
4c9608b2 | 485 | goto out; |
1da177e4 LT |
486 | datap = fhp->fh_handle.fh_auth+ |
487 | fhp->fh_handle.fh_size/4 -1; | |
488 | size = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
489 | fhp->fh_handle.fh_fileid_type = | |
490 | _fh_update(dentry, fhp->fh_export, datap, &size); | |
491 | fhp->fh_handle.fh_size += size*4; | |
492 | if (fhp->fh_handle.fh_fileid_type == 255) | |
493 | return nfserr_opnotsupp; | |
494 | } | |
495 | out: | |
496 | return 0; | |
497 | ||
498 | out_bad: | |
499 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
500 | goto out; | |
501 | out_negative: | |
502 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
503 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
504 | goto out; | |
1da177e4 LT |
505 | } |
506 | ||
507 | /* | |
508 | * Release a file handle. | |
509 | */ | |
510 | void | |
511 | fh_put(struct svc_fh *fhp) | |
512 | { | |
513 | struct dentry * dentry = fhp->fh_dentry; | |
514 | struct svc_export * exp = fhp->fh_export; | |
515 | if (dentry) { | |
516 | fh_unlock(fhp); | |
517 | fhp->fh_dentry = NULL; | |
518 | dput(dentry); | |
519 | #ifdef CONFIG_NFSD_V3 | |
520 | fhp->fh_pre_saved = 0; | |
521 | fhp->fh_post_saved = 0; | |
522 | #endif | |
523 | nfsd_nr_put++; | |
524 | } | |
525 | if (exp) { | |
baab935f | 526 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
527 | fhp->fh_export = NULL; |
528 | } | |
529 | return; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Shorthand for dprintk()'s | |
534 | */ | |
535 | char * SVCFH_fmt(struct svc_fh *fhp) | |
536 | { | |
537 | struct knfsd_fh *fh = &fhp->fh_handle; | |
538 | ||
539 | static char buf[80]; | |
540 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
541 | fh->fh_size, | |
542 | fh->fh_base.fh_pad[0], | |
543 | fh->fh_base.fh_pad[1], | |
544 | fh->fh_base.fh_pad[2], | |
545 | fh->fh_base.fh_pad[3], | |
546 | fh->fh_base.fh_pad[4], | |
547 | fh->fh_base.fh_pad[5]); | |
548 | return buf; | |
549 | } | |
af6a4e28 N |
550 | |
551 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
552 | { | |
553 | if (fhp->fh_handle.fh_version != 1) | |
554 | return FSIDSOURCE_DEV; | |
555 | switch(fhp->fh_handle.fh_fsid_type) { | |
556 | case FSID_DEV: | |
557 | case FSID_ENCODE_DEV: | |
558 | case FSID_MAJOR_MINOR: | |
559 | return FSIDSOURCE_DEV; | |
560 | case FSID_NUM: | |
561 | return FSIDSOURCE_FSID; | |
562 | default: | |
563 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
564 | return FSIDSOURCE_FSID; | |
565 | else | |
566 | return FSIDSOURCE_UUID; | |
567 | } | |
568 | } |