blob: 7011d62acfc8dd3516b52961ad598a8371fcc08d [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>
Andy Adamson32c1eb02007-07-17 04:04:48 -070023#include <linux/sunrpc/svcauth_gss.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/nfsd/nfsd.h>
25
26#define NFSDDBG_FACILITY NFSDDBG_FH
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28
29static int nfsd_nr_verified;
30static int nfsd_nr_put;
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/*
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 */
38static 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 */
Al Viro83b11342006-10-19 23:28:55 -070073static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070074nfsd_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 */
Al Viro83b11342006-10-19 23:28:55 -0700107__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108fh_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;
Al Viro83b11342006-10-19 23:28:55 -0700113 __be32 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (!fhp->fh_dentry) {
118 __u32 *datap=NULL;
119 __u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */
120 int fileid_type;
121 int data_left = fh->fh_size/4;
122
123 error = nfserr_stale;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 if (rqstp->rq_vers > 2)
125 error = nfserr_badhandle;
126 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
127 return nfserr_nofilehandle;
128
129 if (fh->fh_version == 1) {
130 int len;
131 datap = fh->fh_auth;
132 if (--data_left<0) goto out;
133 switch (fh->fh_auth_type) {
134 case 0: break;
135 default: goto out;
136 }
137 len = key_len(fh->fh_fsid_type) / 4;
138 if (len == 0) goto out;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800139 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /* deprecated, convert to type 3 */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800141 len = key_len(FSID_ENCODE_DEV)/4;
142 fh->fh_fsid_type = FSID_ENCODE_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
144 fh->fh_fsid[1] = fh->fh_fsid[2];
145 }
146 if ((data_left -= len)<0) goto out;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700147 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, datap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 datap += len;
149 } else {
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);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800157 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
J. Bruce Fields0989a782007-07-17 04:04:44 -0700158 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 }
160
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700161 error = nfserr_stale;
162 if (PTR_ERR(exp) == -ENOENT)
163 goto out;
164
165 if (IS_ERR(exp)) {
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800166 error = nfserrno(PTR_ERR(exp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 goto out;
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 /* Check if the request originated from a secure port. */
171 error = nfserr_perm;
172 if (!rqstp->rq_secure && EX_SECURE(exp)) {
Chuck Leverad06e4b2007-02-12 00:53:32 -0800173 char buf[RPC_MAX_ADDRBUFLEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 printk(KERN_WARNING
Chuck Leverad06e4b2007-02-12 00:53:32 -0800175 "nfsd: request from insecure port %s!\n",
176 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 goto out;
178 }
179
NeilBrownd1bbf142006-07-30 03:03:16 -0700180 /* Set user creds for this exportpoint */
181 error = nfserrno(nfsd_setuser(rqstp, exp));
182 if (error)
183 goto out;
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /*
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) {
193 tfh[0] = fh->ofh_ino;
194 tfh[1] = fh->ofh_generation;
195 tfh[2] = fh->ofh_dirino;
196 datap = tfh;
197 data_left = 3;
198 if (fh->ofh_dirino == 0)
199 fileid_type = 1;
200 else
201 fileid_type = 2;
202 } else
203 fileid_type = fh->fh_fileid_type;
NeilBrown982aedf2007-02-14 00:33:11 -0800204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (fileid_type == 0)
206 dentry = dget(exp->ex_dentry);
207 else {
Christoph Hellwigd37065c2007-07-17 04:04:30 -0700208 dentry = exportfs_decode_fh(exp->ex_mnt, datap,
209 data_left, fileid_type,
210 nfsd_acceptable, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
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 }
NeilBrown34e9a632007-01-29 13:19:52 -0800219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
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;
NeilBrownd1bbf142006-07-30 03:03:16 -0700236 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
245 cache_get(&exp->h);
246
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
249 if (error)
250 goto out;
251
J. Bruce Fields90912242007-07-17 04:04:52 -0700252 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 }
Andy Adamson32c1eb02007-07-17 04:04:48 -0700262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700264 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800267 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,
Al Virofc2dd2e2007-02-01 13:52:43 +0000271 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273out:
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 */
289static inline int _fh_update(struct dentry *dentry, struct svc_export *exp,
290 __u32 *datap, int *maxsize)
291{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (dentry == exp->ex_dentry) {
293 *maxsize = 0;
294 return 0;
295 }
296
Christoph Hellwigd37065c2007-07-17 04:04:30 -0700297 return exportfs_encode_fh(dentry, datap, maxsize,
298 !(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
301/*
302 * for composing old style file handles
303 */
304static inline void _fh_update_old(struct dentry *dentry,
305 struct svc_export *exp,
306 struct knfsd_fh *fh)
307{
308 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
309 fh->ofh_generation = dentry->d_inode->i_generation;
310 if (S_ISDIR(dentry->d_inode->i_mode) ||
311 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
312 fh->ofh_dirino = 0;
313}
314
Al Viro83b11342006-10-19 23:28:55 -0700315__be32
NeilBrown982aedf2007-02-14 00:33:11 -0800316fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
317 struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 /* ref_fh is a reference file handle.
NeilBrown7e405362006-06-30 01:56:12 -0700320 * if it is non-null and for the same filesystem, then we should compose
321 * a filehandle which is of the same version, where possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
323 * Then create a 32byte filehandle using nfs_fhbase_old
324 *
325 */
326
NeilBrownb41eeef2007-05-09 02:34:57 -0700327 u8 version;
NeilBrown982aedf2007-02-14 00:33:11 -0800328 u8 fsid_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 struct inode * inode = dentry->d_inode;
330 struct dentry *parent = dentry->d_parent;
331 __u32 *datap;
332 dev_t ex_dev = exp->ex_dentry->d_inode->i_sb->s_dev;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800333 int root_export = (exp->ex_dentry == exp->ex_dentry->d_sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
336 MAJOR(ex_dev), MINOR(ex_dev),
337 (long) exp->ex_dentry->d_inode->i_ino,
338 parent->d_name.name, dentry->d_name.name,
339 (inode ? inode->i_ino : 0));
340
NeilBrown982aedf2007-02-14 00:33:11 -0800341 /* Choose filehandle version and fsid type based on
342 * the reference filehandle (if it is in the same export)
343 * or the export options.
344 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700345 retry:
346 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700347 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800348 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700349 fsid_type = ref_fh->fh_handle.fh_fsid_type;
350
351 if (ref_fh == fhp)
352 fh_put(ref_fh);
353 ref_fh = NULL;
354
355 switch (version) {
356 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800357 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700358 break;
359 case 1:
360 break;
361 default:
362 goto retry;
363 }
364
365 /* Need to check that this type works for this
366 * export point. As the fsid -> filesystem mapping
367 * was guided by user-space, there is no guarantee
368 * that the filesystem actually supports that fsid
369 * type. If it doesn't we loop around again without
370 * ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800371 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700372 switch(fsid_type) {
373 case FSID_DEV:
374 if (!old_valid_dev(ex_dev))
375 goto retry;
376 /* FALL THROUGH */
377 case FSID_MAJOR_MINOR:
378 case FSID_ENCODE_DEV:
379 if (!(exp->ex_dentry->d_inode->i_sb->s_type->fs_flags
380 & FS_REQUIRES_DEV))
381 goto retry;
382 break;
383 case FSID_NUM:
384 if (! (exp->ex_flags & NFSEXP_FSID))
385 goto retry;
386 break;
387 case FSID_UUID8:
388 case FSID_UUID16:
389 if (!root_export)
390 goto retry;
391 /* fall through */
392 case FSID_UUID4_INUM:
393 case FSID_UUID16_INUM:
394 if (exp->ex_uuid == NULL)
395 goto retry;
396 break;
397 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800398 } else if (exp->ex_uuid) {
399 if (fhp->fh_maxsize >= 64) {
400 if (root_export)
401 fsid_type = FSID_UUID16;
402 else
403 fsid_type = FSID_UUID16_INUM;
404 } else {
405 if (root_export)
406 fsid_type = FSID_UUID8;
407 else
408 fsid_type = FSID_UUID4_INUM;
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 } else if (exp->ex_flags & NFSEXP_FSID)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800411 fsid_type = FSID_NUM;
NeilBrown982aedf2007-02-14 00:33:11 -0800412 else if (!old_valid_dev(ex_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800414 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800415 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800416 fsid_type = FSID_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 if (ref_fh == fhp)
419 fh_put(ref_fh);
420
421 if (fhp->fh_locked || fhp->fh_dentry) {
422 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800423 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
425 if (fhp->fh_maxsize < NFS_FHSIZE)
426 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800427 fhp->fh_maxsize,
428 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 fhp->fh_dentry = dget(dentry); /* our internal copy */
431 fhp->fh_export = exp;
432 cache_get(&exp->h);
433
NeilBrown982aedf2007-02-14 00:33:11 -0800434 if (version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 /* old style filehandle please */
436 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
437 fhp->fh_handle.fh_size = NFS_FHSIZE;
438 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
439 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
440 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
NeilBrown982aedf2007-02-14 00:33:11 -0800441 fhp->fh_handle.ofh_xino =
442 ino_t_to_u32(exp->ex_dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
444 if (inode)
445 _fh_update_old(dentry, exp, &fhp->fh_handle);
446 } else {
447 int len;
448 fhp->fh_handle.fh_version = 1;
449 fhp->fh_handle.fh_auth_type = 0;
450 datap = fhp->fh_handle.fh_auth+0;
NeilBrown982aedf2007-02-14 00:33:11 -0800451 fhp->fh_handle.fh_fsid_type = fsid_type;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800452 mk_fsid(fsid_type, datap, ex_dev,
453 exp->ex_dentry->d_inode->i_ino,
454 exp->ex_fsid, exp->ex_uuid);
455
NeilBrown982aedf2007-02-14 00:33:11 -0800456 len = key_len(fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 datap += len/4;
458 fhp->fh_handle.fh_size = 4 + len;
459
460 if (inode) {
461 int size = (fhp->fh_maxsize-len-4)/4;
462 fhp->fh_handle.fh_fileid_type =
463 _fh_update(dentry, exp, datap, &size);
464 fhp->fh_handle.fh_size += size*4;
465 }
466 if (fhp->fh_handle.fh_fileid_type == 255)
467 return nfserr_opnotsupp;
468 }
469
470 nfsd_nr_verified++;
471 return 0;
472}
473
474/*
475 * Update file handle information after changing a dentry.
476 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
477 */
Al Viro83b11342006-10-19 23:28:55 -0700478__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479fh_update(struct svc_fh *fhp)
480{
481 struct dentry *dentry;
482 __u32 *datap;
NeilBrown982aedf2007-02-14 00:33:11 -0800483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 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 {
493 int size;
494 if (fhp->fh_handle.fh_fileid_type != 0)
NeilBrown4c9608b2006-06-30 01:56:11 -0700495 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 datap = fhp->fh_handle.fh_auth+
497 fhp->fh_handle.fh_size/4 -1;
498 size = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
499 fhp->fh_handle.fh_fileid_type =
500 _fh_update(dentry, fhp->fh_export, datap, &size);
501 fhp->fh_handle.fh_size += size*4;
502 if (fhp->fh_handle.fh_fileid_type == 255)
503 return nfserr_opnotsupp;
504 }
505out:
506 return 0;
507
508out_bad:
509 printk(KERN_ERR "fh_update: fh not verified!\n");
510 goto out;
511out_negative:
512 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
513 dentry->d_parent->d_name.name, dentry->d_name.name);
514 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
517/*
518 * Release a file handle.
519 */
520void
521fh_put(struct svc_fh *fhp)
522{
523 struct dentry * dentry = fhp->fh_dentry;
524 struct svc_export * exp = fhp->fh_export;
525 if (dentry) {
526 fh_unlock(fhp);
527 fhp->fh_dentry = NULL;
528 dput(dentry);
529#ifdef CONFIG_NFSD_V3
530 fhp->fh_pre_saved = 0;
531 fhp->fh_post_saved = 0;
532#endif
533 nfsd_nr_put++;
534 }
535 if (exp) {
NeilBrownbaab9352006-03-27 01:15:09 -0800536 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 fhp->fh_export = NULL;
538 }
539 return;
540}
541
542/*
543 * Shorthand for dprintk()'s
544 */
545char * SVCFH_fmt(struct svc_fh *fhp)
546{
547 struct knfsd_fh *fh = &fhp->fh_handle;
548
549 static char buf[80];
550 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
551 fh->fh_size,
552 fh->fh_base.fh_pad[0],
553 fh->fh_base.fh_pad[1],
554 fh->fh_base.fh_pad[2],
555 fh->fh_base.fh_pad[3],
556 fh->fh_base.fh_pad[4],
557 fh->fh_base.fh_pad[5]);
558 return buf;
559}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800560
561enum fsid_source fsid_source(struct svc_fh *fhp)
562{
563 if (fhp->fh_handle.fh_version != 1)
564 return FSIDSOURCE_DEV;
565 switch(fhp->fh_handle.fh_fsid_type) {
566 case FSID_DEV:
567 case FSID_ENCODE_DEV:
568 case FSID_MAJOR_MINOR:
Neil Brownb8da0d12007-09-05 17:22:13 -0400569 if (fhp->fh_export->ex_dentry->d_inode->i_sb->s_type->fs_flags
570 & FS_REQUIRES_DEV)
571 return FSIDSOURCE_DEV;
572 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800573 case FSID_NUM:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800574 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
575 return FSIDSOURCE_FSID;
Neil Brownb8da0d12007-09-05 17:22:13 -0400576 break;
577 default:
578 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800579 }
Neil Brownb8da0d12007-09-05 17:22:13 -0400580 /* either a UUID type filehandle, or the filehandle doesn't
581 * match the export.
582 */
583 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
584 return FSIDSOURCE_FSID;
585 if (fhp->fh_export->ex_uuid)
586 return FSIDSOURCE_UUID;
587 return FSIDSOURCE_DEV;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800588}