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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); | |
54 | err = permission(parent->d_inode, MAY_EXEC, NULL); | |
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)) { | |
104 | char buf[RPC_MAX_ADDRBUFLEN]; | |
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 | ||
1da177e4 LT |
115 | /* |
116 | * Perform sanity checks on the dentry in a client's file handle. | |
117 | * | |
118 | * Note that the file handle dentry may need to be freed even after | |
119 | * an error return. | |
120 | * | |
121 | * This is only called at the start of an nfsproc call, so fhp points to | |
122 | * a svc_fh which is all 0 except for the over-the-wire file handle. | |
123 | */ | |
83b11340 | 124 | __be32 |
1da177e4 LT |
125 | fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) |
126 | { | |
127 | struct knfsd_fh *fh = &fhp->fh_handle; | |
128 | struct svc_export *exp = NULL; | |
129 | struct dentry *dentry; | |
83b11340 | 130 | __be32 error = 0; |
1da177e4 LT |
131 | |
132 | dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); | |
133 | ||
1da177e4 | 134 | if (!fhp->fh_dentry) { |
6e91ea2b | 135 | struct fid *fid = NULL, sfid; |
1da177e4 LT |
136 | int fileid_type; |
137 | int data_left = fh->fh_size/4; | |
138 | ||
139 | error = nfserr_stale; | |
1da177e4 LT |
140 | if (rqstp->rq_vers > 2) |
141 | error = nfserr_badhandle; | |
142 | if (rqstp->rq_vers == 4 && fh->fh_size == 0) | |
143 | return nfserr_nofilehandle; | |
144 | ||
145 | if (fh->fh_version == 1) { | |
146 | int len; | |
1da177e4 LT |
147 | if (--data_left<0) goto out; |
148 | switch (fh->fh_auth_type) { | |
149 | case 0: break; | |
150 | default: goto out; | |
151 | } | |
152 | len = key_len(fh->fh_fsid_type) / 4; | |
153 | if (len == 0) goto out; | |
af6a4e28 | 154 | if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { |
1da177e4 | 155 | /* deprecated, convert to type 3 */ |
af6a4e28 N |
156 | len = key_len(FSID_ENCODE_DEV)/4; |
157 | fh->fh_fsid_type = FSID_ENCODE_DEV; | |
1da177e4 LT |
158 | fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); |
159 | fh->fh_fsid[1] = fh->fh_fsid[2]; | |
160 | } | |
161 | if ((data_left -= len)<0) goto out; | |
6e91ea2b CH |
162 | exp = rqst_exp_find(rqstp, fh->fh_fsid_type, |
163 | fh->fh_auth); | |
164 | fid = (struct fid *)(fh->fh_auth + len); | |
1da177e4 | 165 | } else { |
6e91ea2b | 166 | __u32 tfh[2]; |
1da177e4 LT |
167 | dev_t xdev; |
168 | ino_t xino; | |
169 | if (fh->fh_size != NFS_FHSIZE) | |
170 | goto out; | |
171 | /* assume old filehandle format */ | |
172 | xdev = old_decode_dev(fh->ofh_xdev); | |
173 | xino = u32_to_ino_t(fh->ofh_xino); | |
af6a4e28 | 174 | mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); |
0989a788 | 175 | exp = rqst_exp_find(rqstp, FSID_DEV, tfh); |
1da177e4 LT |
176 | } |
177 | ||
2d3bb252 BF |
178 | error = nfserr_stale; |
179 | if (PTR_ERR(exp) == -ENOENT) | |
1da177e4 LT |
180 | goto out; |
181 | ||
2d3bb252 BF |
182 | if (IS_ERR(exp)) { |
183 | error = nfserrno(PTR_ERR(exp)); | |
1da177e4 | 184 | goto out; |
2d3bb252 | 185 | } |
1da177e4 | 186 | |
6fa02839 | 187 | error = nfsd_setuser_and_check_port(rqstp, exp); |
d1bbf14f N |
188 | if (error) |
189 | goto out; | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Look up the dentry using the NFS file handle. | |
193 | */ | |
194 | error = nfserr_stale; | |
195 | if (rqstp->rq_vers > 2) | |
196 | error = nfserr_badhandle; | |
197 | ||
198 | if (fh->fh_version != 1) { | |
6e91ea2b CH |
199 | sfid.i32.ino = fh->ofh_ino; |
200 | sfid.i32.gen = fh->ofh_generation; | |
201 | sfid.i32.parent_ino = fh->ofh_dirino; | |
202 | fid = &sfid; | |
1da177e4 LT |
203 | data_left = 3; |
204 | if (fh->ofh_dirino == 0) | |
6e91ea2b | 205 | fileid_type = FILEID_INO32_GEN; |
1da177e4 | 206 | else |
6e91ea2b | 207 | fileid_type = FILEID_INO32_GEN_PARENT; |
1da177e4 LT |
208 | } else |
209 | fileid_type = fh->fh_fileid_type; | |
982aedfd | 210 | |
6e91ea2b | 211 | if (fileid_type == FILEID_ROOT) |
54775491 | 212 | dentry = dget(exp->ex_path.dentry); |
1da177e4 | 213 | else { |
54775491 | 214 | dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, |
d37065cd CH |
215 | data_left, fileid_type, |
216 | nfsd_acceptable, exp); | |
1da177e4 LT |
217 | } |
218 | if (dentry == NULL) | |
219 | goto out; | |
220 | if (IS_ERR(dentry)) { | |
221 | if (PTR_ERR(dentry) != -EINVAL) | |
222 | error = nfserrno(PTR_ERR(dentry)); | |
223 | goto out; | |
224 | } | |
34e9a63b | 225 | |
1da177e4 LT |
226 | if (S_ISDIR(dentry->d_inode->i_mode) && |
227 | (dentry->d_flags & DCACHE_DISCONNECTED)) { | |
228 | printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", | |
229 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
230 | } | |
1da177e4 LT |
231 | |
232 | fhp->fh_dentry = dentry; | |
233 | fhp->fh_export = exp; | |
234 | nfsd_nr_verified++; | |
235 | } else { | |
6fa02839 BF |
236 | /* |
237 | * just rechecking permissions | |
238 | * (e.g. nfsproc_create calls fh_verify, then nfsd_create | |
239 | * does as well) | |
1da177e4 LT |
240 | */ |
241 | dprintk("nfsd: fh_verify - just checking\n"); | |
242 | dentry = fhp->fh_dentry; | |
243 | exp = fhp->fh_export; | |
6fa02839 BF |
244 | /* |
245 | * Set user creds for this exportpoint; necessary even | |
d1bbf14f N |
246 | * in the "just checking" case because this may be a |
247 | * filehandle that was created by fh_compose, and that | |
248 | * is about to be used in another nfsv4 compound | |
6fa02839 BF |
249 | * operation. |
250 | */ | |
251 | error = nfsd_setuser_and_check_port(rqstp, exp); | |
d1bbf14f N |
252 | if (error) |
253 | goto out; | |
1da177e4 LT |
254 | } |
255 | cache_get(&exp->h); | |
256 | ||
7fc90ec9 | 257 | |
1da177e4 LT |
258 | error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); |
259 | if (error) | |
260 | goto out; | |
261 | ||
9091224f BF |
262 | if (!(access & MAY_LOCK)) { |
263 | /* | |
264 | * pseudoflavor restrictions are not enforced on NLM, | |
265 | * which clients virtually always use auth_sys for, | |
266 | * even while using RPCSEC_GSS for NFS. | |
267 | */ | |
268 | error = check_nfsd_access(exp, rqstp); | |
269 | if (error) | |
270 | goto out; | |
271 | } | |
32c1eb0c | 272 | |
1da177e4 | 273 | /* Finally, check access permissions. */ |
0ec757df | 274 | error = nfsd_permission(rqstp, exp, dentry, access); |
1da177e4 | 275 | |
1da177e4 | 276 | if (error) { |
34e9a63b N |
277 | dprintk("fh_verify: %s/%s permission failure, " |
278 | "acc=%x, error=%d\n", | |
279 | dentry->d_parent->d_name.name, | |
280 | dentry->d_name.name, | |
fc2dd2e5 | 281 | access, ntohl(error)); |
1da177e4 | 282 | } |
1da177e4 LT |
283 | out: |
284 | if (exp && !IS_ERR(exp)) | |
285 | exp_put(exp); | |
286 | if (error == nfserr_stale) | |
287 | nfsdstats.fh_stale++; | |
288 | return error; | |
289 | } | |
290 | ||
291 | ||
292 | /* | |
293 | * Compose a file handle for an NFS reply. | |
294 | * | |
295 | * Note that when first composed, the dentry may not yet have | |
296 | * an inode. In this case a call to fh_update should be made | |
297 | * before the fh goes out on the wire ... | |
298 | */ | |
6e91ea2b CH |
299 | static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, |
300 | struct dentry *dentry) | |
1da177e4 | 301 | { |
54775491 | 302 | if (dentry != exp->ex_path.dentry) { |
6e91ea2b CH |
303 | struct fid *fid = (struct fid *) |
304 | (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); | |
305 | int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; | |
306 | int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); | |
1da177e4 | 307 | |
6e91ea2b CH |
308 | fhp->fh_handle.fh_fileid_type = |
309 | exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); | |
310 | fhp->fh_handle.fh_size += maxsize * 4; | |
311 | } else { | |
312 | fhp->fh_handle.fh_fileid_type = FILEID_ROOT; | |
313 | } | |
1da177e4 LT |
314 | } |
315 | ||
316 | /* | |
317 | * for composing old style file handles | |
318 | */ | |
319 | static inline void _fh_update_old(struct dentry *dentry, | |
320 | struct svc_export *exp, | |
321 | struct knfsd_fh *fh) | |
322 | { | |
323 | fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); | |
324 | fh->ofh_generation = dentry->d_inode->i_generation; | |
325 | if (S_ISDIR(dentry->d_inode->i_mode) || | |
326 | (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) | |
327 | fh->ofh_dirino = 0; | |
328 | } | |
329 | ||
83b11340 | 330 | __be32 |
982aedfd N |
331 | fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, |
332 | struct svc_fh *ref_fh) | |
1da177e4 LT |
333 | { |
334 | /* ref_fh is a reference file handle. | |
7e405364 N |
335 | * if it is non-null and for the same filesystem, then we should compose |
336 | * a filehandle which is of the same version, where possible. | |
1da177e4 LT |
337 | * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca |
338 | * Then create a 32byte filehandle using nfs_fhbase_old | |
339 | * | |
340 | */ | |
341 | ||
b41eeef1 | 342 | u8 version; |
982aedfd | 343 | u8 fsid_type = 0; |
1da177e4 LT |
344 | struct inode * inode = dentry->d_inode; |
345 | struct dentry *parent = dentry->d_parent; | |
346 | __u32 *datap; | |
54775491 JB |
347 | dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev; |
348 | int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root); | |
1da177e4 LT |
349 | |
350 | dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", | |
351 | MAJOR(ex_dev), MINOR(ex_dev), | |
54775491 | 352 | (long) exp->ex_path.dentry->d_inode->i_ino, |
1da177e4 LT |
353 | parent->d_name.name, dentry->d_name.name, |
354 | (inode ? inode->i_ino : 0)); | |
355 | ||
982aedfd N |
356 | /* Choose filehandle version and fsid type based on |
357 | * the reference filehandle (if it is in the same export) | |
358 | * or the export options. | |
359 | */ | |
b41eeef1 N |
360 | retry: |
361 | version = 1; | |
7e405364 | 362 | if (ref_fh && ref_fh->fh_export == exp) { |
982aedfd | 363 | version = ref_fh->fh_handle.fh_version; |
b41eeef1 N |
364 | fsid_type = ref_fh->fh_handle.fh_fsid_type; |
365 | ||
366 | if (ref_fh == fhp) | |
367 | fh_put(ref_fh); | |
368 | ref_fh = NULL; | |
369 | ||
370 | switch (version) { | |
371 | case 0xca: | |
af6a4e28 | 372 | fsid_type = FSID_DEV; |
b41eeef1 N |
373 | break; |
374 | case 1: | |
375 | break; | |
376 | default: | |
377 | goto retry; | |
378 | } | |
379 | ||
380 | /* Need to check that this type works for this | |
381 | * export point. As the fsid -> filesystem mapping | |
382 | * was guided by user-space, there is no guarantee | |
383 | * that the filesystem actually supports that fsid | |
384 | * type. If it doesn't we loop around again without | |
385 | * ref_fh set. | |
982aedfd | 386 | */ |
b41eeef1 N |
387 | switch(fsid_type) { |
388 | case FSID_DEV: | |
389 | if (!old_valid_dev(ex_dev)) | |
390 | goto retry; | |
391 | /* FALL THROUGH */ | |
392 | case FSID_MAJOR_MINOR: | |
393 | case FSID_ENCODE_DEV: | |
54775491 | 394 | if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b41eeef1 N |
395 | & FS_REQUIRES_DEV)) |
396 | goto retry; | |
397 | break; | |
398 | case FSID_NUM: | |
399 | if (! (exp->ex_flags & NFSEXP_FSID)) | |
400 | goto retry; | |
401 | break; | |
402 | case FSID_UUID8: | |
403 | case FSID_UUID16: | |
404 | if (!root_export) | |
405 | goto retry; | |
406 | /* fall through */ | |
407 | case FSID_UUID4_INUM: | |
408 | case FSID_UUID16_INUM: | |
409 | if (exp->ex_uuid == NULL) | |
410 | goto retry; | |
411 | break; | |
412 | } | |
af6a4e28 N |
413 | } else if (exp->ex_uuid) { |
414 | if (fhp->fh_maxsize >= 64) { | |
415 | if (root_export) | |
416 | fsid_type = FSID_UUID16; | |
417 | else | |
418 | fsid_type = FSID_UUID16_INUM; | |
419 | } else { | |
420 | if (root_export) | |
421 | fsid_type = FSID_UUID8; | |
422 | else | |
423 | fsid_type = FSID_UUID4_INUM; | |
424 | } | |
1da177e4 | 425 | } else if (exp->ex_flags & NFSEXP_FSID) |
af6a4e28 | 426 | fsid_type = FSID_NUM; |
982aedfd | 427 | else if (!old_valid_dev(ex_dev)) |
1da177e4 | 428 | /* for newer device numbers, we must use a newer fsid format */ |
af6a4e28 | 429 | fsid_type = FSID_ENCODE_DEV; |
982aedfd | 430 | else |
af6a4e28 | 431 | fsid_type = FSID_DEV; |
1da177e4 LT |
432 | |
433 | if (ref_fh == fhp) | |
434 | fh_put(ref_fh); | |
435 | ||
436 | if (fhp->fh_locked || fhp->fh_dentry) { | |
437 | printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", | |
982aedfd | 438 | parent->d_name.name, dentry->d_name.name); |
1da177e4 LT |
439 | } |
440 | if (fhp->fh_maxsize < NFS_FHSIZE) | |
441 | printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", | |
982aedfd N |
442 | fhp->fh_maxsize, |
443 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
444 | |
445 | fhp->fh_dentry = dget(dentry); /* our internal copy */ | |
446 | fhp->fh_export = exp; | |
447 | cache_get(&exp->h); | |
448 | ||
982aedfd | 449 | if (version == 0xca) { |
1da177e4 LT |
450 | /* old style filehandle please */ |
451 | memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); | |
452 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
453 | fhp->fh_handle.ofh_dcookie = 0xfeebbaca; | |
454 | fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); | |
455 | fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; | |
982aedfd | 456 | fhp->fh_handle.ofh_xino = |
54775491 | 457 | ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); |
1da177e4 LT |
458 | fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); |
459 | if (inode) | |
460 | _fh_update_old(dentry, exp, &fhp->fh_handle); | |
461 | } else { | |
462 | int len; | |
463 | fhp->fh_handle.fh_version = 1; | |
464 | fhp->fh_handle.fh_auth_type = 0; | |
465 | datap = fhp->fh_handle.fh_auth+0; | |
982aedfd | 466 | fhp->fh_handle.fh_fsid_type = fsid_type; |
af6a4e28 | 467 | mk_fsid(fsid_type, datap, ex_dev, |
54775491 | 468 | exp->ex_path.dentry->d_inode->i_ino, |
af6a4e28 N |
469 | exp->ex_fsid, exp->ex_uuid); |
470 | ||
982aedfd | 471 | len = key_len(fsid_type); |
1da177e4 LT |
472 | datap += len/4; |
473 | fhp->fh_handle.fh_size = 4 + len; | |
474 | ||
6e91ea2b CH |
475 | if (inode) |
476 | _fh_update(fhp, exp, dentry); | |
1da177e4 LT |
477 | if (fhp->fh_handle.fh_fileid_type == 255) |
478 | return nfserr_opnotsupp; | |
479 | } | |
480 | ||
481 | nfsd_nr_verified++; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Update file handle information after changing a dentry. | |
487 | * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create | |
488 | */ | |
83b11340 | 489 | __be32 |
1da177e4 LT |
490 | fh_update(struct svc_fh *fhp) |
491 | { | |
492 | struct dentry *dentry; | |
982aedfd | 493 | |
1da177e4 LT |
494 | if (!fhp->fh_dentry) |
495 | goto out_bad; | |
496 | ||
497 | dentry = fhp->fh_dentry; | |
498 | if (!dentry->d_inode) | |
499 | goto out_negative; | |
500 | if (fhp->fh_handle.fh_version != 1) { | |
501 | _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); | |
502 | } else { | |
6e91ea2b | 503 | if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) |
4c9608b2 | 504 | goto out; |
6e91ea2b CH |
505 | |
506 | _fh_update(fhp, fhp->fh_export, dentry); | |
1da177e4 LT |
507 | if (fhp->fh_handle.fh_fileid_type == 255) |
508 | return nfserr_opnotsupp; | |
509 | } | |
510 | out: | |
511 | return 0; | |
512 | ||
513 | out_bad: | |
514 | printk(KERN_ERR "fh_update: fh not verified!\n"); | |
515 | goto out; | |
516 | out_negative: | |
517 | printk(KERN_ERR "fh_update: %s/%s still negative!\n", | |
518 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
519 | goto out; | |
1da177e4 LT |
520 | } |
521 | ||
522 | /* | |
523 | * Release a file handle. | |
524 | */ | |
525 | void | |
526 | fh_put(struct svc_fh *fhp) | |
527 | { | |
528 | struct dentry * dentry = fhp->fh_dentry; | |
529 | struct svc_export * exp = fhp->fh_export; | |
530 | if (dentry) { | |
531 | fh_unlock(fhp); | |
532 | fhp->fh_dentry = NULL; | |
533 | dput(dentry); | |
534 | #ifdef CONFIG_NFSD_V3 | |
535 | fhp->fh_pre_saved = 0; | |
536 | fhp->fh_post_saved = 0; | |
537 | #endif | |
538 | nfsd_nr_put++; | |
539 | } | |
540 | if (exp) { | |
baab935f | 541 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
542 | fhp->fh_export = NULL; |
543 | } | |
544 | return; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Shorthand for dprintk()'s | |
549 | */ | |
550 | char * SVCFH_fmt(struct svc_fh *fhp) | |
551 | { | |
552 | struct knfsd_fh *fh = &fhp->fh_handle; | |
553 | ||
554 | static char buf[80]; | |
555 | sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", | |
556 | fh->fh_size, | |
557 | fh->fh_base.fh_pad[0], | |
558 | fh->fh_base.fh_pad[1], | |
559 | fh->fh_base.fh_pad[2], | |
560 | fh->fh_base.fh_pad[3], | |
561 | fh->fh_base.fh_pad[4], | |
562 | fh->fh_base.fh_pad[5]); | |
563 | return buf; | |
564 | } | |
af6a4e28 N |
565 | |
566 | enum fsid_source fsid_source(struct svc_fh *fhp) | |
567 | { | |
568 | if (fhp->fh_handle.fh_version != 1) | |
569 | return FSIDSOURCE_DEV; | |
570 | switch(fhp->fh_handle.fh_fsid_type) { | |
571 | case FSID_DEV: | |
572 | case FSID_ENCODE_DEV: | |
573 | case FSID_MAJOR_MINOR: | |
54775491 | 574 | if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags |
b8da0d1c NB |
575 | & FS_REQUIRES_DEV) |
576 | return FSIDSOURCE_DEV; | |
577 | break; | |
af6a4e28 | 578 | case FSID_NUM: |
af6a4e28 N |
579 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) |
580 | return FSIDSOURCE_FSID; | |
b8da0d1c NB |
581 | break; |
582 | default: | |
583 | break; | |
af6a4e28 | 584 | } |
b8da0d1c NB |
585 | /* either a UUID type filehandle, or the filehandle doesn't |
586 | * match the export. | |
587 | */ | |
588 | if (fhp->fh_export->ex_flags & NFSEXP_FSID) | |
589 | return FSIDSOURCE_FSID; | |
590 | if (fhp->fh_export->ex_uuid) | |
591 | return FSIDSOURCE_UUID; | |
592 | return FSIDSOURCE_DEV; | |
af6a4e28 | 593 | } |