blob: 180e068ea064d6ff8e19d7640118fc9abbaa2cae [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/fs.h>
14#include <linux/unistd.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/dcache.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070018#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Chuck Leverad06e4b2007-02-12 00:53:32 -080021#include <linux/sunrpc/clnt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/sunrpc/svc.h>
23#include <linux/nfsd/nfsd.h>
24
25#define NFSDDBG_FACILITY NFSDDBG_FH
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27
28static int nfsd_nr_verified;
29static int nfsd_nr_put;
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/*
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 */
37static 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 */
Al Viro83b11342006-10-19 23:28:55 -070072static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070073nfsd_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 */
Al Viro83b11342006-10-19 23:28:55 -0700106__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107fh_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;
Al Viro83b11342006-10-19 23:28:55 -0700112 __be32 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 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;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800140 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 /* deprecated, convert to type 3 */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800142 len = key_len(FSID_ENCODE_DEV)/4;
143 fh->fh_fsid_type = FSID_ENCODE_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 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;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700148 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, datap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 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);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800158 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
J. Bruce Fields0989a782007-07-17 04:04:44 -0700159 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700162 error = nfserr_stale;
163 if (PTR_ERR(exp) == -ENOENT)
164 goto out;
165
166 if (IS_ERR(exp)) {
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800167 error = nfserrno(PTR_ERR(exp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 goto out;
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 /* Check if the request originated from a secure port. */
172 error = nfserr_perm;
173 if (!rqstp->rq_secure && EX_SECURE(exp)) {
Chuck Leverad06e4b2007-02-12 00:53:32 -0800174 char buf[RPC_MAX_ADDRBUFLEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 printk(KERN_WARNING
Chuck Leverad06e4b2007-02-12 00:53:32 -0800176 "nfsd: request from insecure port %s!\n",
177 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 goto out;
179 }
180
NeilBrownd1bbf142006-07-30 03:03:16 -0700181 /* Set user creds for this exportpoint */
182 error = nfserrno(nfsd_setuser(rqstp, exp));
183 if (error)
184 goto out;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /*
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;
NeilBrown982aedf2007-02-14 00:33:11 -0800205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (fileid_type == 0)
207 dentry = dget(exp->ex_dentry);
208 else {
Christoph Hellwigd37065c2007-07-17 04:04:30 -0700209 dentry = exportfs_decode_fh(exp->ex_mnt, datap,
210 data_left, fileid_type,
211 nfsd_acceptable, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
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 }
NeilBrown34e9a632007-01-29 13:19:52 -0800220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
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;
NeilBrownd1bbf142006-07-30 03:03:16 -0700237 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 }
246 cache_get(&exp->h);
247
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800257 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,
Al Virofc2dd2e2007-02-01 13:52:43 +0000261 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263out:
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 */
279static inline int _fh_update(struct dentry *dentry, struct svc_export *exp,
280 __u32 *datap, int *maxsize)
281{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (dentry == exp->ex_dentry) {
283 *maxsize = 0;
284 return 0;
285 }
286
Christoph Hellwigd37065c2007-07-17 04:04:30 -0700287 return exportfs_encode_fh(dentry, datap, maxsize,
288 !(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
291/*
292 * for composing old style file handles
293 */
294static 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
Al Viro83b11342006-10-19 23:28:55 -0700305__be32
NeilBrown982aedf2007-02-14 00:33:11 -0800306fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
307 struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
309 /* ref_fh is a reference file handle.
NeilBrown7e405362006-06-30 01:56:12 -0700310 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 * 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
NeilBrownb41eeef2007-05-09 02:34:57 -0700317 u8 version;
NeilBrown982aedf2007-02-14 00:33:11 -0800318 u8 fsid_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 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;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800323 int root_export = (exp->ex_dentry == exp->ex_dentry->d_sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
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
NeilBrown982aedf2007-02-14 00:33:11 -0800331 /* 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 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700335 retry:
336 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700337 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800338 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700339 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:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800347 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700348 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.
NeilBrown982aedf2007-02-14 00:33:11 -0800361 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700362 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 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800388 } 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 } else if (exp->ex_flags & NFSEXP_FSID)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800401 fsid_type = FSID_NUM;
NeilBrown982aedf2007-02-14 00:33:11 -0800402 else if (!old_valid_dev(ex_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800404 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800405 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800406 fsid_type = FSID_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
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",
NeilBrown982aedf2007-02-14 00:33:11 -0800413 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
415 if (fhp->fh_maxsize < NFS_FHSIZE)
416 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800417 fhp->fh_maxsize,
418 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 fhp->fh_dentry = dget(dentry); /* our internal copy */
421 fhp->fh_export = exp;
422 cache_get(&exp->h);
423
NeilBrown982aedf2007-02-14 00:33:11 -0800424 if (version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 /* 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;
NeilBrown982aedf2007-02-14 00:33:11 -0800431 fhp->fh_handle.ofh_xino =
432 ino_t_to_u32(exp->ex_dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 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;
NeilBrown982aedf2007-02-14 00:33:11 -0800441 fhp->fh_handle.fh_fsid_type = fsid_type;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800442 mk_fsid(fsid_type, datap, ex_dev,
443 exp->ex_dentry->d_inode->i_ino,
444 exp->ex_fsid, exp->ex_uuid);
445
NeilBrown982aedf2007-02-14 00:33:11 -0800446 len = key_len(fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 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 */
Al Viro83b11342006-10-19 23:28:55 -0700468__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469fh_update(struct svc_fh *fhp)
470{
471 struct dentry *dentry;
472 __u32 *datap;
NeilBrown982aedf2007-02-14 00:33:11 -0800473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 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)
NeilBrown4c9608b2006-06-30 01:56:11 -0700485 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 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 }
495out:
496 return 0;
497
498out_bad:
499 printk(KERN_ERR "fh_update: fh not verified!\n");
500 goto out;
501out_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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
507/*
508 * Release a file handle.
509 */
510void
511fh_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) {
NeilBrownbaab9352006-03-27 01:15:09 -0800526 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 fhp->fh_export = NULL;
528 }
529 return;
530}
531
532/*
533 * Shorthand for dprintk()'s
534 */
535char * 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}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800550
551enum 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}