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 LT |
24 | #include <linux/nfsd/nfsd.h> |
25 | ||
26 | #define NFSDDBG_FACILITY NFSDDBG_FH | |
1da177e4 LT |
27 | |
28 | ||
29 | static int nfsd_nr_verified; | |
30 | static int nfsd_nr_put; | |
31 | ||
1da177e4 LT |
32 | /* |
33 | * our acceptability function. | |
34 | * if NOSUBTREECHECK, accept anything | |
35 | * if not, require that we can walk up to exp->ex_dentry | |
36 | * doing some checks on the 'x' bits | |
37 | */ | |
38 | static int nfsd_acceptable(void *expv, struct dentry *dentry) | |
39 | { | |
40 | struct svc_export *exp = expv; | |
41 | int rv; | |
42 | struct dentry *tdentry; | |
43 | struct dentry *parent; | |
44 | ||
45 | if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) | |
46 | return 1; | |
47 | ||
48 | tdentry = dget(dentry); | |
49 | while (tdentry != exp->ex_dentry && ! IS_ROOT(tdentry)) { | |
50 | /* make sure parents give x permission to user */ | |
51 | int err; | |
52 | parent = dget_parent(tdentry); | |
53 | err = permission(parent->d_inode, MAY_EXEC, NULL); | |
54 | if (err < 0) { | |
55 | dput(parent); | |
56 | break; | |
57 | } | |
58 | dput(tdentry); | |
59 | tdentry = parent; | |
60 | } | |
61 | if (tdentry != exp->ex_dentry) | |
62 | dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); | |
63 | rv = (tdentry == exp->ex_dentry); | |
64 | dput(tdentry); | |
65 | return rv; | |
66 | } | |
67 | ||
68 | /* Type check. The correct error return for type mismatches does not seem to be | |
69 | * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a | |
70 | * comment in the NFSv3 spec says this is incorrect (implementation notes for | |
71 | * the write call). | |
72 | */ | |
83b11340 | 73 | static inline __be32 |
1da177e4 LT |
74 | nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type) |
75 | { | |
76 | /* Type can be negative when creating hardlinks - not to a dir */ | |
77 | if (type > 0 && (mode & S_IFMT) != type) { | |
78 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
79 | return nfserr_symlink; | |
80 | else if (type == S_IFDIR) | |
81 | return nfserr_notdir; | |
82 | else if ((mode & S_IFMT) == S_IFDIR) | |
83 | return nfserr_isdir; | |
84 | else | |
85 | return nfserr_inval; | |
86 | } | |
87 | if (type < 0 && (mode & S_IFMT) == -type) { | |
88 | if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK) | |
89 | return nfserr_symlink; | |
90 | else if (type == -S_IFDIR) | |
91 | return nfserr_isdir; | |
92 | else | |
93 | return nfserr_notdir; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Perform sanity checks on the dentry in a client's file handle. | |
100 | * | |
101 | * Note that the file handle dentry may need to be freed even after | |
102 | * an error return. | |
103 | * | |
104 | * This is only called at the start of an nfsproc call, so fhp points to | |
105 | * a svc_fh which is all 0 except for the over-the-wire file handle. | |
106 | */ | |
83b11340 | 107 | __be32 |
1da177e4 LT |
108 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
109 | { | |
110 | struct knfsd_fh *fh = &fhp->fh_handle; | |
111 | struct svc_export *exp = NULL; | |
112 | struct dentry *dentry; | |
83b11340 | 113 | __be32 error = 0; |
1da177e4 LT |
114 | |
115 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
116 | ||
1da177e4 | 117 | if (!fhp->fh_dentry) { |
6e91ea2b | 118 | struct fid *fid = NULL, sfid; |
1da177e4 LT |
119 | int fileid_type; |
120 | int data_left = fh->fh_size/4; | |
121 | ||
122 | error = nfserr_stale; | |
1da177e4 LT |
123 | if (rqstp->rq_vers > 2) |
124 | error = nfserr_badhandle; | |
125 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
126 | return nfserr_nofilehandle; | |
127 | ||
128 | if (fh->fh_version == 1) { | |
129 | int len; | |
1da177e4 LT |
130 | if (--data_left<0) goto out; |
131 | switch (fh->fh_auth_type) { | |
132 | case 0: break; | |
133 | default: goto out; | |
134 | } | |
135 | len = key_len(fh->fh_fsid_type) / 4; | |
136 | if (len == 0) goto out; | |
af6a4e28 | 137 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { |
1da177e4 | 138 | /* deprecated, convert to type 3 */ |
af6a4e28 N |
139 | len = key_len(FSID_ENCODE_DEV)/4; |
140 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
1da177e4 LT |
141 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); |
142 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
143 | } | |
144 | if ((data_left -= len)<0) goto out; | |
6e91ea2b CH |
145 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, |
146 | fh->fh_auth); | |
147 | fid = (struct fid *)(fh->fh_auth + len); | |
1da177e4 | 148 | } else { |
6e91ea2b | 149 | __u32 tfh[2]; |
1da177e4 LT |
150 | dev_t xdev; |
151 | ino_t xino; | |
152 | if (fh->fh_size != NFS_FHSIZE) | |
153 | goto out; | |
154 | /* assume old filehandle format */ | |
155 | xdev = old_decode_dev(fh->ofh_xdev); | |
156 | xino = u32_to_ino_t(fh->ofh_xino); | |
af6a4e28 | 157 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); |
0989a788 | 158 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); |
1da177e4 LT |
159 | } |
160 | ||
2d3bb252 BF |
161 | error = nfserr_stale; |
162 | if (PTR_ERR(exp) == -ENOENT) | |
1da177e4 LT |
163 | goto out; |
164 | ||
2d3bb252 BF |
165 | if (IS_ERR(exp)) { |
166 | error = nfserrno(PTR_ERR(exp)); | |
1da177e4 | 167 | goto out; |
2d3bb252 | 168 | } |
1da177e4 LT |
169 | |
170 | /* Check if the request originated from a secure port. */ | |
171 | error = nfserr_perm; | |
172 | if (!rqstp->rq_secure && EX_SECURE(exp)) { | |
ad06e4bd | 173 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 | 174 | printk(KERN_WARNING |
ad06e4bd CL |
175 | "nfsd: request from insecure port %s!\n", |
176 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 LT |
177 | goto out; |
178 | } | |
179 | ||
d1bbf14f N |
180 | /* Set user creds for this exportpoint */ |
181 | error = nfserrno(nfsd_setuser(rqstp, exp)); | |
182 | if (error) | |
183 | goto out; | |
184 | ||
1da177e4 LT |
185 | /* |
186 | * Look up the dentry using the NFS file handle. | |
187 | */ | |
188 | error = nfserr_stale; | |
189 | if (rqstp->rq_vers > 2) | |
190 | error = nfserr_badhandle; | |
191 | ||
192 | if (fh->fh_version != 1) { | |
6e91ea2b CH |
193 | sfid.i32.ino = fh->ofh_ino; |
194 | sfid.i32.gen = fh->ofh_generation; | |
195 | sfid.i32.parent_ino = fh->ofh_dirino; | |
196 | fid = &sfid; | |
1da177e4 LT |
197 | data_left = 3; |
198 | if (fh->ofh_dirino == 0) | |
6e91ea2b | 199 | fileid_type = FILEID_INO32_GEN; |
1da177e4 | 200 | else |
6e91ea2b | 201 | fileid_type = FILEID_INO32_GEN_PARENT; |
1da177e4 LT |
202 | } else |
203 | fileid_type = fh->fh_fileid_type; | |
982aedfd | 204 | |
6e91ea2b | 205 | if (fileid_type == FILEID_ROOT) |
1da177e4 LT |
206 | dentry = dget(exp->ex_dentry); |
207 | else { | |
6e91ea2b | 208 | dentry = exportfs_decode_fh(exp->ex_mnt, fid, |
d37065cd CH |
209 | data_left, fileid_type, |
210 | nfsd_acceptable, exp); | |
1da177e4 LT |
211 | } |
212 | if (dentry == NULL) | |
213 | goto out; | |
214 | if (IS_ERR(dentry)) { | |
215 | if (PTR_ERR(dentry) != -EINVAL) | |
216 | error = nfserrno(PTR_ERR(dentry)); | |
217 | goto out; | |
218 | } | |
34e9a63b | 219 | |
1da177e4 LT |
220 | if (S_ISDIR(dentry->d_inode->i_mode) && |
221 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
222 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
223 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
224 | } | |
1da177e4 LT |
225 | |
226 | fhp->fh_dentry = dentry; | |
227 | fhp->fh_export = exp; | |
228 | nfsd_nr_verified++; | |
229 | } else { | |
230 | /* just rechecking permissions | |
231 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well) | |
232 | */ | |
233 | dprintk("nfsd: fh_verify - just checking\n"); | |
234 | dentry = fhp->fh_dentry; | |
235 | exp = fhp->fh_export; | |
d1bbf14f N |
236 | /* Set user creds for this exportpoint; necessary even |
237 | * in the "just checking" case because this may be a | |
238 | * filehandle that was created by fh_compose, and that | |
239 | * is about to be used in another nfsv4 compound | |
240 | * operation */ | |
241 | error = nfserrno(nfsd_setuser(rqstp, exp)); | |
242 | if (error) | |
243 | goto out; | |
1da177e4 LT |
244 | } |
245 | cache_get(&exp->h); | |
246 | ||
7fc90ec9 | 247 | |
1da177e4 LT |
248 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
249 | if (error) | |
250 | goto out; | |
251 | ||
9091224f BF |
252 | if (!(access & MAY_LOCK)) { |
253 | /* | |
254 | * pseudoflavor restrictions are not enforced on NLM, | |
255 | * which clients virtually always use auth_sys for, | |
256 | * even while using RPCSEC_GSS for NFS. | |
257 | */ | |
258 | error = check_nfsd_access(exp, rqstp); | |
259 | if (error) | |
260 | goto out; | |
261 | } | |
32c1eb0c | 262 | |
1da177e4 | 263 | /* Finally, check access permissions. */ |
0ec757df | 264 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 265 | |
1da177e4 | 266 | if (error) { |
34e9a63b N |
267 | dprintk("fh_verify: %s/%s permission failure, " |
268 | "acc=%x, error=%d\n", | |
269 | dentry->d_parent->d_name.name, | |
270 | dentry->d_name.name, | |
fc2dd2e5 | 271 | access, ntohl(error)); |
1da177e4 | 272 | } |
1da177e4 LT |
273 | out: |
274 | if (exp && !IS_ERR(exp)) | |
275 | exp_put(exp); | |
276 | if (error == nfserr_stale) | |
277 | nfsdstats.fh_stale++; | |
278 | return error; | |
279 | } | |
280 | ||
281 | ||
282 | /* | |
283 | * Compose a file handle for an NFS reply. | |
284 | * | |
285 | * Note that when first composed, the dentry may not yet have | |
286 | * an inode. In this case a call to fh_update should be made | |
287 | * before the fh goes out on the wire ... | |
288 | */ | |
6e91ea2b CH |
289 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
290 | struct dentry *dentry) | |
1da177e4 | 291 | { |
6e91ea2b CH |
292 | if (dentry != exp->ex_dentry) { |
293 | struct fid *fid = (struct fid *) | |
294 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
295 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
296 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 297 | |
6e91ea2b CH |
298 | fhp->fh_handle.fh_fileid_type = |
299 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
300 | fhp->fh_handle.fh_size += maxsize * 4; | |
301 | } else { | |
302 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
303 | } | |
1da177e4 LT |
304 | } |
305 | ||
306 | /* | |
307 | * for composing old style file handles | |
308 | */ | |
309 | static inline void _fh_update_old(struct dentry *dentry, | |
310 | struct svc_export *exp, | |
311 | struct knfsd_fh *fh) | |
312 | { | |
313 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
314 | fh->ofh_generation = dentry->d_inode->i_generation; | |
315 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
316 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
317 | fh->ofh_dirino = 0; | |
318 | } | |
319 | ||
83b11340 | 320 | __be32 |
982aedfd N |
321 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, |
322 | struct svc_fh *ref_fh) | |
1da177e4 LT |
323 | { |
324 | /* ref_fh is a reference file handle. | |
7e405364 N |
325 | * if it is non-null and for the same filesystem, then we should compose |
326 | * a filehandle which is of the same version, where possible. | |
1da177e4 LT |
327 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca |
328 | * Then create a 32byte filehandle using nfs_fhbase_old | |
329 | * | |
330 | */ | |
331 | ||
b41eeef1 | 332 | u8 version; |
982aedfd | 333 | u8 fsid_type = 0; |
1da177e4 LT |
334 | struct inode * inode = dentry->d_inode; |
335 | struct dentry *parent = dentry->d_parent; | |
336 | __u32 *datap; | |
337 | dev_t ex_dev = exp->ex_dentry->d_inode->i_sb->s_dev; | |
af6a4e28 | 338 | int root_export = (exp->ex_dentry == exp->ex_dentry->d_sb->s_root); |
1da177e4 LT |
339 | |
340 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
341 | MAJOR(ex_dev), MINOR(ex_dev), | |
342 | (long) exp->ex_dentry->d_inode->i_ino, | |
343 | parent->d_name.name, dentry->d_name.name, | |
344 | (inode ? inode->i_ino : 0)); | |
345 | ||
982aedfd N |
346 | /* Choose filehandle version and fsid type based on |
347 | * the reference filehandle (if it is in the same export) | |
348 | * or the export options. | |
349 | */ | |
b41eeef1 N |
350 | retry: |
351 | version = 1; | |
7e405364 | 352 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 353 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
354 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
355 | ||
356 | if (ref_fh == fhp) | |
357 | fh_put(ref_fh); | |
358 | ref_fh = NULL; | |
359 | ||
360 | switch (version) { | |
361 | case 0xca: | |
af6a4e28 | 362 | fsid_type = FSID_DEV; |
b41eeef1 N |
363 | break; |
364 | case 1: | |
365 | break; | |
366 | default: | |
367 | goto retry; | |
368 | } | |
369 | ||
370 | /* Need to check that this type works for this | |
371 | * export point. As the fsid -> filesystem mapping | |
372 | * was guided by user-space, there is no guarantee | |
373 | * that the filesystem actually supports that fsid | |
374 | * type. If it doesn't we loop around again without | |
375 | * ref_fh set. | |
982aedfd | 376 | */ |
b41eeef1 N |
377 | switch(fsid_type) { |
378 | case FSID_DEV: | |
379 | if (!old_valid_dev(ex_dev)) | |
380 | goto retry; | |
381 | /* FALL THROUGH */ | |
382 | case FSID_MAJOR_MINOR: | |
383 | case FSID_ENCODE_DEV: | |
384 | if (!(exp->ex_dentry->d_inode->i_sb->s_type->fs_flags | |
385 | & FS_REQUIRES_DEV)) | |
386 | goto retry; | |
387 | break; | |
388 | case FSID_NUM: | |
389 | if (! (exp->ex_flags & NFSEXP_FSID)) | |
390 | goto retry; | |
391 | break; | |
392 | case FSID_UUID8: | |
393 | case FSID_UUID16: | |
394 | if (!root_export) | |
395 | goto retry; | |
396 | /* fall through */ | |
397 | case FSID_UUID4_INUM: | |
398 | case FSID_UUID16_INUM: | |
399 | if (exp->ex_uuid == NULL) | |
400 | goto retry; | |
401 | break; | |
402 | } | |
af6a4e28 N |
403 | } else if (exp->ex_uuid) { |
404 | if (fhp->fh_maxsize >= 64) { | |
405 | if (root_export) | |
406 | fsid_type = FSID_UUID16; | |
407 | else | |
408 | fsid_type = FSID_UUID16_INUM; | |
409 | } else { | |
410 | if (root_export) | |
411 | fsid_type = FSID_UUID8; | |
412 | else | |
413 | fsid_type = FSID_UUID4_INUM; | |
414 | } | |
1da177e4 | 415 | } else if (exp->ex_flags & NFSEXP_FSID) |
af6a4e28 | 416 | fsid_type = FSID_NUM; |
982aedfd | 417 | else if (!old_valid_dev(ex_dev)) |
1da177e4 | 418 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 419 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 420 | else |
af6a4e28 | 421 | fsid_type = FSID_DEV; |
1da177e4 LT |
422 | |
423 | if (ref_fh == fhp) | |
424 | fh_put(ref_fh); | |
425 | ||
426 | if (fhp->fh_locked || fhp->fh_dentry) { | |
427 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 428 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
429 | } |
430 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
431 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
432 | fhp->fh_maxsize, |
433 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
434 | |
435 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
436 | fhp->fh_export = exp; | |
437 | cache_get(&exp->h); | |
438 | ||
982aedfd | 439 | if (version == 0xca) { |
1da177e4 LT |
440 | /* old style filehandle please */ |
441 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
442 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
443 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
444 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
445 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd N |
446 | fhp->fh_handle.ofh_xino = |
447 | ino_t_to_u32(exp->ex_dentry->d_inode->i_ino); | |
1da177e4 LT |
448 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
449 | if (inode) | |
450 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
451 | } else { | |
452 | int len; | |
453 | fhp->fh_handle.fh_version = 1; | |
454 | fhp->fh_handle.fh_auth_type = 0; | |
455 | datap = fhp->fh_handle.fh_auth+0; | |
982aedfd | 456 | fhp->fh_handle.fh_fsid_type = fsid_type; |
af6a4e28 N |
457 | mk_fsid(fsid_type, datap, ex_dev, |
458 | exp->ex_dentry->d_inode->i_ino, | |
459 | exp->ex_fsid, exp->ex_uuid); | |
460 | ||
982aedfd | 461 | len = key_len(fsid_type); |
1da177e4 LT |
462 | datap += len/4; |
463 | fhp->fh_handle.fh_size = 4 + len; | |
464 | ||
6e91ea2b CH |
465 | if (inode) |
466 | _fh_update(fhp, exp, dentry); | |
1da177e4 LT |
467 | if (fhp->fh_handle.fh_fileid_type == 255) |
468 | return nfserr_opnotsupp; | |
469 | } | |
470 | ||
471 | nfsd_nr_verified++; | |
472 | return 0; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Update file handle information after changing a dentry. | |
477 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
478 | */ | |
83b11340 | 479 | __be32 |
1da177e4 LT |
480 | fh_update(struct svc_fh *fhp) |
481 | { | |
482 | struct dentry *dentry; | |
982aedfd | 483 | |
1da177e4 LT |
484 | if (!fhp->fh_dentry) |
485 | goto out_bad; | |
486 | ||
487 | dentry = fhp->fh_dentry; | |
488 | if (!dentry->d_inode) | |
489 | goto out_negative; | |
490 | if (fhp->fh_handle.fh_version != 1) { | |
491 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
492 | } else { | |
6e91ea2b | 493 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 494 | goto out; |
6e91ea2b CH |
495 | |
496 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
497 | if (fhp->fh_handle.fh_fileid_type == 255) |
498 | return nfserr_opnotsupp; | |
499 | } | |
500 | out: | |
501 | return 0; | |
502 | ||
503 | out_bad: | |
504 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
505 | goto out; | |
506 | out_negative: | |
507 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
508 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
509 | goto out; | |
1da177e4 LT |
510 | } |
511 | ||
512 | /* | |
513 | * Release a file handle. | |
514 | */ | |
515 | void | |
516 | fh_put(struct svc_fh *fhp) | |
517 | { | |
518 | struct dentry * dentry = fhp->fh_dentry; | |
519 | struct svc_export * exp = fhp->fh_export; | |
520 | if (dentry) { | |
521 | fh_unlock(fhp); | |
522 | fhp->fh_dentry = NULL; | |
523 | dput(dentry); | |
524 | #ifdef CONFIG_NFSD_V3 | |
525 | fhp->fh_pre_saved = 0; | |
526 | fhp->fh_post_saved = 0; | |
527 | #endif | |
528 | nfsd_nr_put++; | |
529 | } | |
530 | if (exp) { | |
baab935f | 531 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
532 | fhp->fh_export = NULL; |
533 | } | |
534 | return; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Shorthand for dprintk()'s | |
539 | */ | |
540 | char * SVCFH_fmt(struct svc_fh *fhp) | |
541 | { | |
542 | struct knfsd_fh *fh = &fhp->fh_handle; | |
543 | ||
544 | static char buf[80]; | |
545 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
546 | fh->fh_size, | |
547 | fh->fh_base.fh_pad[0], | |
548 | fh->fh_base.fh_pad[1], | |
549 | fh->fh_base.fh_pad[2], | |
550 | fh->fh_base.fh_pad[3], | |
551 | fh->fh_base.fh_pad[4], | |
552 | fh->fh_base.fh_pad[5]); | |
553 | return buf; | |
554 | } | |
af6a4e28 N |
555 | |
556 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
557 | { | |
558 | if (fhp->fh_handle.fh_version != 1) | |
559 | return FSIDSOURCE_DEV; | |
560 | switch(fhp->fh_handle.fh_fsid_type) { | |
561 | case FSID_DEV: | |
562 | case FSID_ENCODE_DEV: | |
563 | case FSID_MAJOR_MINOR: | |
b8da0d1c NB |
564 | if (fhp->fh_export->ex_dentry->d_inode->i_sb->s_type->fs_flags |
565 | & FS_REQUIRES_DEV) | |
566 | return FSIDSOURCE_DEV; | |
567 | break; | |
af6a4e28 | 568 | case FSID_NUM: |
af6a4e28 N |
569 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
570 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
571 | break; |
572 | default: | |
573 | break; | |
af6a4e28 | 574 | } |
b8da0d1c NB |
575 | /* either a UUID type filehandle, or the filehandle doesn't |
576 | * match the export. | |
577 | */ | |
578 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
579 | return FSIDSOURCE_FSID; | |
580 | if (fhp->fh_export->ex_uuid) | |
581 | return FSIDSOURCE_UUID; | |
582 | return FSIDSOURCE_DEV; | |
af6a4e28 | 583 | } |