blob: 468f17a784416e96e11081d90230a8e6df4eec90 [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
J. Bruce Fields6fa02832007-11-12 16:05:03 -050098static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
99 struct svc_export *exp)
100{
101 /* Check if the request originated from a secure port. */
102 if (!rqstp->rq_secure && EX_SECURE(exp)) {
103 char buf[RPC_MAX_ADDRBUFLEN];
104 dprintk(KERN_WARNING
105 "nfsd: request from insecure port %s!\n",
106 svc_print_addr(rqstp, buf, sizeof(buf)));
107 return nfserr_perm;
108 }
109
110 /* Set user creds for this exportpoint */
111 return nfserrno(nfsd_setuser(rqstp, exp));
112}
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114/*
115 * Perform sanity checks on the dentry in a client's file handle.
116 *
117 * Note that the file handle dentry may need to be freed even after
118 * an error return.
119 *
120 * This is only called at the start of an nfsproc call, so fhp points to
121 * a svc_fh which is all 0 except for the over-the-wire file handle.
122 */
Al Viro83b11342006-10-19 23:28:55 -0700123__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
125{
126 struct knfsd_fh *fh = &fhp->fh_handle;
127 struct svc_export *exp = NULL;
128 struct dentry *dentry;
Al Viro83b11342006-10-19 23:28:55 -0700129 __be32 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (!fhp->fh_dentry) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700134 struct fid *fid = NULL, sfid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 int fileid_type;
136 int data_left = fh->fh_size/4;
137
138 error = nfserr_stale;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 if (rqstp->rq_vers > 2)
140 error = nfserr_badhandle;
141 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
142 return nfserr_nofilehandle;
143
144 if (fh->fh_version == 1) {
145 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (--data_left<0) goto out;
147 switch (fh->fh_auth_type) {
148 case 0: break;
149 default: goto out;
150 }
151 len = key_len(fh->fh_fsid_type) / 4;
152 if (len == 0) goto out;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800153 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 /* deprecated, convert to type 3 */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800155 len = key_len(FSID_ENCODE_DEV)/4;
156 fh->fh_fsid_type = FSID_ENCODE_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
158 fh->fh_fsid[1] = fh->fh_fsid[2];
159 }
160 if ((data_left -= len)<0) goto out;
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700161 exp = rqst_exp_find(rqstp, fh->fh_fsid_type,
162 fh->fh_auth);
163 fid = (struct fid *)(fh->fh_auth + len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 } else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700165 __u32 tfh[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 dev_t xdev;
167 ino_t xino;
168 if (fh->fh_size != NFS_FHSIZE)
169 goto out;
170 /* assume old filehandle format */
171 xdev = old_decode_dev(fh->ofh_xdev);
172 xino = u32_to_ino_t(fh->ofh_xino);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800173 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
J. Bruce Fields0989a782007-07-17 04:04:44 -0700174 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700177 error = nfserr_stale;
178 if (PTR_ERR(exp) == -ENOENT)
179 goto out;
180
181 if (IS_ERR(exp)) {
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800182 error = nfserrno(PTR_ERR(exp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 goto out;
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500186 error = nfsd_setuser_and_check_port(rqstp, exp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700187 if (error)
188 goto out;
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 /*
191 * Look up the dentry using the NFS file handle.
192 */
193 error = nfserr_stale;
194 if (rqstp->rq_vers > 2)
195 error = nfserr_badhandle;
196
197 if (fh->fh_version != 1) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700198 sfid.i32.ino = fh->ofh_ino;
199 sfid.i32.gen = fh->ofh_generation;
200 sfid.i32.parent_ino = fh->ofh_dirino;
201 fid = &sfid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 data_left = 3;
203 if (fh->ofh_dirino == 0)
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700204 fileid_type = FILEID_INO32_GEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 else
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700206 fileid_type = FILEID_INO32_GEN_PARENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 } else
208 fileid_type = fh->fh_fileid_type;
NeilBrown982aedf2007-02-14 00:33:11 -0800209
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700210 if (fileid_type == FILEID_ROOT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 dentry = dget(exp->ex_dentry);
212 else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700213 dentry = exportfs_decode_fh(exp->ex_mnt, fid,
Christoph Hellwigd37065c2007-07-17 04:04:30 -0700214 data_left, fileid_type,
215 nfsd_acceptable, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217 if (dentry == NULL)
218 goto out;
219 if (IS_ERR(dentry)) {
220 if (PTR_ERR(dentry) != -EINVAL)
221 error = nfserrno(PTR_ERR(dentry));
222 goto out;
223 }
NeilBrown34e9a632007-01-29 13:19:52 -0800224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 if (S_ISDIR(dentry->d_inode->i_mode) &&
226 (dentry->d_flags & DCACHE_DISCONNECTED)) {
227 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
228 dentry->d_parent->d_name.name, dentry->d_name.name);
229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 fhp->fh_dentry = dentry;
232 fhp->fh_export = exp;
233 nfsd_nr_verified++;
234 } else {
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500235 /*
236 * just rechecking permissions
237 * (e.g. nfsproc_create calls fh_verify, then nfsd_create
238 * does as well)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 */
240 dprintk("nfsd: fh_verify - just checking\n");
241 dentry = fhp->fh_dentry;
242 exp = fhp->fh_export;
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500243 /*
244 * Set user creds for this exportpoint; necessary even
NeilBrownd1bbf142006-07-30 03:03:16 -0700245 * in the "just checking" case because this may be a
246 * filehandle that was created by fh_compose, and that
247 * is about to be used in another nfsv4 compound
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500248 * operation.
249 */
250 error = nfsd_setuser_and_check_port(rqstp, exp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700251 if (error)
252 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254 cache_get(&exp->h);
255
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
258 if (error)
259 goto out;
260
J. Bruce Fields90912242007-07-17 04:04:52 -0700261 if (!(access & MAY_LOCK)) {
262 /*
263 * pseudoflavor restrictions are not enforced on NLM,
264 * which clients virtually always use auth_sys for,
265 * even while using RPCSEC_GSS for NFS.
266 */
267 error = check_nfsd_access(exp, rqstp);
268 if (error)
269 goto out;
270 }
Andy Adamson32c1eb02007-07-17 04:04:48 -0700271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700273 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800276 dprintk("fh_verify: %s/%s permission failure, "
277 "acc=%x, error=%d\n",
278 dentry->d_parent->d_name.name,
279 dentry->d_name.name,
Al Virofc2dd2e2007-02-01 13:52:43 +0000280 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282out:
283 if (exp && !IS_ERR(exp))
284 exp_put(exp);
285 if (error == nfserr_stale)
286 nfsdstats.fh_stale++;
287 return error;
288}
289
290
291/*
292 * Compose a file handle for an NFS reply.
293 *
294 * Note that when first composed, the dentry may not yet have
295 * an inode. In this case a call to fh_update should be made
296 * before the fh goes out on the wire ...
297 */
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700298static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
299 struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700301 if (dentry != exp->ex_dentry) {
302 struct fid *fid = (struct fid *)
303 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
304 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
305 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700307 fhp->fh_handle.fh_fileid_type =
308 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
309 fhp->fh_handle.fh_size += maxsize * 4;
310 } else {
311 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
315/*
316 * for composing old style file handles
317 */
318static inline void _fh_update_old(struct dentry *dentry,
319 struct svc_export *exp,
320 struct knfsd_fh *fh)
321{
322 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
323 fh->ofh_generation = dentry->d_inode->i_generation;
324 if (S_ISDIR(dentry->d_inode->i_mode) ||
325 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
326 fh->ofh_dirino = 0;
327}
328
Al Viro83b11342006-10-19 23:28:55 -0700329__be32
NeilBrown982aedf2007-02-14 00:33:11 -0800330fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
331 struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
333 /* ref_fh is a reference file handle.
NeilBrown7e405362006-06-30 01:56:12 -0700334 * if it is non-null and for the same filesystem, then we should compose
335 * a filehandle which is of the same version, where possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
337 * Then create a 32byte filehandle using nfs_fhbase_old
338 *
339 */
340
NeilBrownb41eeef2007-05-09 02:34:57 -0700341 u8 version;
NeilBrown982aedf2007-02-14 00:33:11 -0800342 u8 fsid_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 struct inode * inode = dentry->d_inode;
344 struct dentry *parent = dentry->d_parent;
345 __u32 *datap;
346 dev_t ex_dev = exp->ex_dentry->d_inode->i_sb->s_dev;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800347 int root_export = (exp->ex_dentry == exp->ex_dentry->d_sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
350 MAJOR(ex_dev), MINOR(ex_dev),
351 (long) exp->ex_dentry->d_inode->i_ino,
352 parent->d_name.name, dentry->d_name.name,
353 (inode ? inode->i_ino : 0));
354
NeilBrown982aedf2007-02-14 00:33:11 -0800355 /* Choose filehandle version and fsid type based on
356 * the reference filehandle (if it is in the same export)
357 * or the export options.
358 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700359 retry:
360 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700361 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800362 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700363 fsid_type = ref_fh->fh_handle.fh_fsid_type;
364
365 if (ref_fh == fhp)
366 fh_put(ref_fh);
367 ref_fh = NULL;
368
369 switch (version) {
370 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800371 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700372 break;
373 case 1:
374 break;
375 default:
376 goto retry;
377 }
378
379 /* Need to check that this type works for this
380 * export point. As the fsid -> filesystem mapping
381 * was guided by user-space, there is no guarantee
382 * that the filesystem actually supports that fsid
383 * type. If it doesn't we loop around again without
384 * ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800385 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700386 switch(fsid_type) {
387 case FSID_DEV:
388 if (!old_valid_dev(ex_dev))
389 goto retry;
390 /* FALL THROUGH */
391 case FSID_MAJOR_MINOR:
392 case FSID_ENCODE_DEV:
393 if (!(exp->ex_dentry->d_inode->i_sb->s_type->fs_flags
394 & FS_REQUIRES_DEV))
395 goto retry;
396 break;
397 case FSID_NUM:
398 if (! (exp->ex_flags & NFSEXP_FSID))
399 goto retry;
400 break;
401 case FSID_UUID8:
402 case FSID_UUID16:
403 if (!root_export)
404 goto retry;
405 /* fall through */
406 case FSID_UUID4_INUM:
407 case FSID_UUID16_INUM:
408 if (exp->ex_uuid == NULL)
409 goto retry;
410 break;
411 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800412 } else if (exp->ex_uuid) {
413 if (fhp->fh_maxsize >= 64) {
414 if (root_export)
415 fsid_type = FSID_UUID16;
416 else
417 fsid_type = FSID_UUID16_INUM;
418 } else {
419 if (root_export)
420 fsid_type = FSID_UUID8;
421 else
422 fsid_type = FSID_UUID4_INUM;
423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 } else if (exp->ex_flags & NFSEXP_FSID)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800425 fsid_type = FSID_NUM;
NeilBrown982aedf2007-02-14 00:33:11 -0800426 else if (!old_valid_dev(ex_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800428 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800429 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800430 fsid_type = FSID_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 if (ref_fh == fhp)
433 fh_put(ref_fh);
434
435 if (fhp->fh_locked || fhp->fh_dentry) {
436 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800437 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439 if (fhp->fh_maxsize < NFS_FHSIZE)
440 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800441 fhp->fh_maxsize,
442 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 fhp->fh_dentry = dget(dentry); /* our internal copy */
445 fhp->fh_export = exp;
446 cache_get(&exp->h);
447
NeilBrown982aedf2007-02-14 00:33:11 -0800448 if (version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 /* old style filehandle please */
450 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
451 fhp->fh_handle.fh_size = NFS_FHSIZE;
452 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
453 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
454 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
NeilBrown982aedf2007-02-14 00:33:11 -0800455 fhp->fh_handle.ofh_xino =
456 ino_t_to_u32(exp->ex_dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
458 if (inode)
459 _fh_update_old(dentry, exp, &fhp->fh_handle);
460 } else {
461 int len;
462 fhp->fh_handle.fh_version = 1;
463 fhp->fh_handle.fh_auth_type = 0;
464 datap = fhp->fh_handle.fh_auth+0;
NeilBrown982aedf2007-02-14 00:33:11 -0800465 fhp->fh_handle.fh_fsid_type = fsid_type;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800466 mk_fsid(fsid_type, datap, ex_dev,
467 exp->ex_dentry->d_inode->i_ino,
468 exp->ex_fsid, exp->ex_uuid);
469
NeilBrown982aedf2007-02-14 00:33:11 -0800470 len = key_len(fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 datap += len/4;
472 fhp->fh_handle.fh_size = 4 + len;
473
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700474 if (inode)
475 _fh_update(fhp, exp, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (fhp->fh_handle.fh_fileid_type == 255)
477 return nfserr_opnotsupp;
478 }
479
480 nfsd_nr_verified++;
481 return 0;
482}
483
484/*
485 * Update file handle information after changing a dentry.
486 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
487 */
Al Viro83b11342006-10-19 23:28:55 -0700488__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489fh_update(struct svc_fh *fhp)
490{
491 struct dentry *dentry;
NeilBrown982aedf2007-02-14 00:33:11 -0800492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (!fhp->fh_dentry)
494 goto out_bad;
495
496 dentry = fhp->fh_dentry;
497 if (!dentry->d_inode)
498 goto out_negative;
499 if (fhp->fh_handle.fh_version != 1) {
500 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
501 } else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700502 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
NeilBrown4c9608b2006-06-30 01:56:11 -0700503 goto out;
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700504
505 _fh_update(fhp, fhp->fh_export, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 if (fhp->fh_handle.fh_fileid_type == 255)
507 return nfserr_opnotsupp;
508 }
509out:
510 return 0;
511
512out_bad:
513 printk(KERN_ERR "fh_update: fh not verified!\n");
514 goto out;
515out_negative:
516 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
517 dentry->d_parent->d_name.name, dentry->d_name.name);
518 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519}
520
521/*
522 * Release a file handle.
523 */
524void
525fh_put(struct svc_fh *fhp)
526{
527 struct dentry * dentry = fhp->fh_dentry;
528 struct svc_export * exp = fhp->fh_export;
529 if (dentry) {
530 fh_unlock(fhp);
531 fhp->fh_dentry = NULL;
532 dput(dentry);
533#ifdef CONFIG_NFSD_V3
534 fhp->fh_pre_saved = 0;
535 fhp->fh_post_saved = 0;
536#endif
537 nfsd_nr_put++;
538 }
539 if (exp) {
NeilBrownbaab9352006-03-27 01:15:09 -0800540 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 fhp->fh_export = NULL;
542 }
543 return;
544}
545
546/*
547 * Shorthand for dprintk()'s
548 */
549char * SVCFH_fmt(struct svc_fh *fhp)
550{
551 struct knfsd_fh *fh = &fhp->fh_handle;
552
553 static char buf[80];
554 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
555 fh->fh_size,
556 fh->fh_base.fh_pad[0],
557 fh->fh_base.fh_pad[1],
558 fh->fh_base.fh_pad[2],
559 fh->fh_base.fh_pad[3],
560 fh->fh_base.fh_pad[4],
561 fh->fh_base.fh_pad[5]);
562 return buf;
563}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800564
565enum fsid_source fsid_source(struct svc_fh *fhp)
566{
567 if (fhp->fh_handle.fh_version != 1)
568 return FSIDSOURCE_DEV;
569 switch(fhp->fh_handle.fh_fsid_type) {
570 case FSID_DEV:
571 case FSID_ENCODE_DEV:
572 case FSID_MAJOR_MINOR:
Neil Brownb8da0d12007-09-05 17:22:13 -0400573 if (fhp->fh_export->ex_dentry->d_inode->i_sb->s_type->fs_flags
574 & FS_REQUIRES_DEV)
575 return FSIDSOURCE_DEV;
576 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800577 case FSID_NUM:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800578 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
579 return FSIDSOURCE_FSID;
Neil Brownb8da0d12007-09-05 17:22:13 -0400580 break;
581 default:
582 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800583 }
Neil Brownb8da0d12007-09-05 17:22:13 -0400584 /* either a UUID type filehandle, or the filehandle doesn't
585 * match the export.
586 */
587 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
588 return FSIDSOURCE_FSID;
589 if (fhp->fh_export->ex_uuid)
590 return FSIDSOURCE_UUID;
591 return FSIDSOURCE_DEV;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800592}