blob: 9f1ca17293d3e0a54a42234643f250aa22c6e062 [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>
J. Bruce Fields2e8138a2007-11-15 17:05:43 -050025#include "auth.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#define NFSDDBG_FACILITY NFSDDBG_FH
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29
30static int nfsd_nr_verified;
31static int nfsd_nr_put;
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033/*
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 */
39static 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);
Jan Blunck54775492008-02-14 19:38:39 -080050 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 /* make sure parents give x permission to user */
52 int err;
53 parent = dget_parent(tdentry);
Al Virof419a2e2008-07-22 00:07:17 -040054 err = inode_permission(parent->d_inode, MAY_EXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 if (err < 0) {
56 dput(parent);
57 break;
58 }
59 dput(tdentry);
60 tdentry = parent;
61 }
Jan Blunck54775492008-02-14 19:38:39 -080062 if (tdentry != exp->ex_path.dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
Jan Blunck54775492008-02-14 19:38:39 -080064 rv = (tdentry == exp->ex_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 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 */
Al Viro83b11342006-10-19 23:28:55 -070074static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070075nfsd_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
J. Bruce Fields6fa02832007-11-12 16:05:03 -050099static __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)) {
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300104 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500105 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/*
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400116 * Use the given filehandle to look up the corresponding export and
117 * dentry. On success, the results are used to set fh_export and
118 * fh_dentry.
119 */
120static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
121{
122 struct knfsd_fh *fh = &fhp->fh_handle;
123 struct fid *fid = NULL, sfid;
124 struct svc_export *exp;
125 struct dentry *dentry;
126 int fileid_type;
127 int data_left = fh->fh_size/4;
128 __be32 error;
129
130 error = nfserr_stale;
131 if (rqstp->rq_vers > 2)
132 error = nfserr_badhandle;
133 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
134 return nfserr_nofilehandle;
135
136 if (fh->fh_version == 1) {
137 int len;
138
139 if (--data_left < 0)
140 return error;
141 if (fh->fh_auth_type != 0)
142 return error;
143 len = key_len(fh->fh_fsid_type) / 4;
144 if (len == 0)
145 return error;
146 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
147 /* deprecated, convert to type 3 */
148 len = key_len(FSID_ENCODE_DEV)/4;
149 fh->fh_fsid_type = FSID_ENCODE_DEV;
150 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
151 fh->fh_fsid[1] = fh->fh_fsid[2];
152 }
153 data_left -= len;
154 if (data_left < 0)
155 return error;
156 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
157 fid = (struct fid *)(fh->fh_auth + len);
158 } else {
159 __u32 tfh[2];
160 dev_t xdev;
161 ino_t xino;
162
163 if (fh->fh_size != NFS_FHSIZE)
164 return error;
165 /* assume old filehandle format */
166 xdev = old_decode_dev(fh->ofh_xdev);
167 xino = u32_to_ino_t(fh->ofh_xino);
168 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
169 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
170 }
171
172 error = nfserr_stale;
173 if (PTR_ERR(exp) == -ENOENT)
174 return error;
175
176 if (IS_ERR(exp))
177 return nfserrno(PTR_ERR(exp));
178
Neil Brown496d6c32008-05-08 13:03:09 +1000179 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
180 /* Elevate privileges so that the lack of 'r' or 'x'
181 * permission on some parent directory will
182 * not stop exportfs_decode_fh from being able
183 * to reconnect a directory into the dentry cache.
184 * The same problem can affect "SUBTREECHECK" exports,
185 * but as nfsd_acceptable depends on correct
186 * access control settings being in effect, we cannot
187 * fix that case easily.
188 */
David Howellsd84f4f92008-11-14 10:39:23 +1100189 struct cred *new = prepare_creds();
190 if (!new)
191 return nfserrno(-ENOMEM);
192 new->cap_effective =
193 cap_raise_nfsd_set(new->cap_effective,
194 new->cap_permitted);
195 put_cred(override_creds(new));
196 put_cred(new);
Neil Brown496d6c32008-05-08 13:03:09 +1000197 } else {
198 error = nfsd_setuser_and_check_port(rqstp, exp);
199 if (error)
200 goto out;
201 }
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400202
203 /*
204 * Look up the dentry using the NFS file handle.
205 */
206 error = nfserr_stale;
207 if (rqstp->rq_vers > 2)
208 error = nfserr_badhandle;
209
210 if (fh->fh_version != 1) {
211 sfid.i32.ino = fh->ofh_ino;
212 sfid.i32.gen = fh->ofh_generation;
213 sfid.i32.parent_ino = fh->ofh_dirino;
214 fid = &sfid;
215 data_left = 3;
216 if (fh->ofh_dirino == 0)
217 fileid_type = FILEID_INO32_GEN;
218 else
219 fileid_type = FILEID_INO32_GEN_PARENT;
220 } else
221 fileid_type = fh->fh_fileid_type;
222
223 if (fileid_type == FILEID_ROOT)
224 dentry = dget(exp->ex_path.dentry);
225 else {
226 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
227 data_left, fileid_type,
228 nfsd_acceptable, exp);
229 }
230 if (dentry == NULL)
231 goto out;
232 if (IS_ERR(dentry)) {
233 if (PTR_ERR(dentry) != -EINVAL)
234 error = nfserrno(PTR_ERR(dentry));
235 goto out;
236 }
237
Neil Brown496d6c32008-05-08 13:03:09 +1000238 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
239 error = nfsd_setuser_and_check_port(rqstp, exp);
240 if (error) {
241 dput(dentry);
242 goto out;
243 }
244 }
245
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400246 if (S_ISDIR(dentry->d_inode->i_mode) &&
247 (dentry->d_flags & DCACHE_DISCONNECTED)) {
248 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
249 dentry->d_parent->d_name.name, dentry->d_name.name);
250 }
251
252 fhp->fh_dentry = dentry;
253 fhp->fh_export = exp;
254 nfsd_nr_verified++;
255 return 0;
256out:
257 exp_put(exp);
258 return error;
259}
260
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400261/**
262 * fh_verify - filehandle lookup and access checking
263 * @rqstp: pointer to current rpc request
264 * @fhp: filehandle to be verified
265 * @type: expected type of object pointed to by filehandle
266 * @access: type of access needed to object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400268 * Look up a dentry from the on-the-wire filehandle, check the client's
269 * access to the export, and set the current task's credentials.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400271 * Regardless of success or failure of fh_verify(), fh_put() should be
272 * called on @fhp when the caller is finished with the filehandle.
273 *
274 * fh_verify() may be called multiple times on a given filehandle, for
275 * example, when processing an NFSv4 compound. The first call will look
276 * up a dentry using the on-the-wire filehandle. Subsequent calls will
277 * skip the lookup and just perform the other checks and possibly change
278 * the current task's credentials.
279 *
280 * @type specifies the type of object expected using one of the S_IF*
281 * constants defined in include/linux/stat.h. The caller may use zero
282 * to indicate that it doesn't care, or a negative integer to indicate
283 * that it expects something not of the given type.
284 *
285 * @access is formed from the NFSD_MAY_* constants defined in
286 * include/linux/nfsd/nfsd.h.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 */
Al Viro83b11342006-10-19 23:28:55 -0700288__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
290{
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400291 struct svc_export *exp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 struct dentry *dentry;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400293 __be32 error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (!fhp->fh_dentry) {
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400298 error = nfsd_set_fh_dentry(rqstp, fhp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700299 if (error)
300 goto out;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400301 dentry = fhp->fh_dentry;
302 exp = fhp->fh_export;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 } else {
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500304 /*
305 * just rechecking permissions
306 * (e.g. nfsproc_create calls fh_verify, then nfsd_create
307 * does as well)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 */
309 dprintk("nfsd: fh_verify - just checking\n");
310 dentry = fhp->fh_dentry;
311 exp = fhp->fh_export;
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500312 /*
313 * Set user creds for this exportpoint; necessary even
NeilBrownd1bbf142006-07-30 03:03:16 -0700314 * in the "just checking" case because this may be a
315 * filehandle that was created by fh_compose, and that
316 * is about to be used in another nfsv4 compound
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500317 * operation.
318 */
319 error = nfsd_setuser_and_check_port(rqstp, exp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700320 if (error)
321 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
325 if (error)
326 goto out;
327
J. Bruce Fields04716e62008-08-07 13:00:20 -0400328 /*
329 * pseudoflavor restrictions are not enforced on NLM,
330 * which clients virtually always use auth_sys for,
331 * even while using RPCSEC_GSS for NFS.
332 */
333 if (access & NFSD_MAY_LOCK)
334 goto skip_pseudoflavor_check;
335 /*
336 * Clients may expect to be able to use auth_sys during mount,
337 * even if they use gss for everything else; see section 2.3.2
338 * of rfc 2623.
339 */
340 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
341 && exp->ex_path.dentry == dentry)
342 goto skip_pseudoflavor_check;
Andy Adamson32c1eb02007-07-17 04:04:48 -0700343
J. Bruce Fields04716e62008-08-07 13:00:20 -0400344 error = check_nfsd_access(exp, rqstp);
345 if (error)
346 goto out;
347
348skip_pseudoflavor_check:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700350 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800353 dprintk("fh_verify: %s/%s permission failure, "
354 "acc=%x, error=%d\n",
355 dentry->d_parent->d_name.name,
356 dentry->d_name.name,
Al Virofc2dd2e2007-02-01 13:52:43 +0000357 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (error == nfserr_stale)
361 nfsdstats.fh_stale++;
362 return error;
363}
364
365
366/*
367 * Compose a file handle for an NFS reply.
368 *
369 * Note that when first composed, the dentry may not yet have
370 * an inode. In this case a call to fh_update should be made
371 * before the fh goes out on the wire ...
372 */
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700373static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
374 struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Jan Blunck54775492008-02-14 19:38:39 -0800376 if (dentry != exp->ex_path.dentry) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700377 struct fid *fid = (struct fid *)
378 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
379 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
380 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700382 fhp->fh_handle.fh_fileid_type =
383 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
384 fhp->fh_handle.fh_size += maxsize * 4;
385 } else {
386 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
390/*
391 * for composing old style file handles
392 */
393static inline void _fh_update_old(struct dentry *dentry,
394 struct svc_export *exp,
395 struct knfsd_fh *fh)
396{
397 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
398 fh->ofh_generation = dentry->d_inode->i_generation;
399 if (S_ISDIR(dentry->d_inode->i_mode) ||
400 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
401 fh->ofh_dirino = 0;
402}
403
Al Viro83b11342006-10-19 23:28:55 -0700404__be32
NeilBrown982aedf2007-02-14 00:33:11 -0800405fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
406 struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407{
408 /* ref_fh is a reference file handle.
NeilBrown7e405362006-06-30 01:56:12 -0700409 * if it is non-null and for the same filesystem, then we should compose
410 * a filehandle which is of the same version, where possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
412 * Then create a 32byte filehandle using nfs_fhbase_old
413 *
414 */
415
NeilBrownb41eeef2007-05-09 02:34:57 -0700416 u8 version;
NeilBrown982aedf2007-02-14 00:33:11 -0800417 u8 fsid_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct inode * inode = dentry->d_inode;
419 struct dentry *parent = dentry->d_parent;
420 __u32 *datap;
Jan Blunck54775492008-02-14 19:38:39 -0800421 dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev;
422 int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
425 MAJOR(ex_dev), MINOR(ex_dev),
Jan Blunck54775492008-02-14 19:38:39 -0800426 (long) exp->ex_path.dentry->d_inode->i_ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 parent->d_name.name, dentry->d_name.name,
428 (inode ? inode->i_ino : 0));
429
NeilBrown982aedf2007-02-14 00:33:11 -0800430 /* Choose filehandle version and fsid type based on
431 * the reference filehandle (if it is in the same export)
432 * or the export options.
433 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700434 retry:
435 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700436 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800437 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700438 fsid_type = ref_fh->fh_handle.fh_fsid_type;
439
440 if (ref_fh == fhp)
441 fh_put(ref_fh);
442 ref_fh = NULL;
443
444 switch (version) {
445 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800446 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700447 break;
448 case 1:
449 break;
450 default:
451 goto retry;
452 }
453
454 /* Need to check that this type works for this
455 * export point. As the fsid -> filesystem mapping
456 * was guided by user-space, there is no guarantee
457 * that the filesystem actually supports that fsid
458 * type. If it doesn't we loop around again without
459 * ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800460 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700461 switch(fsid_type) {
462 case FSID_DEV:
463 if (!old_valid_dev(ex_dev))
464 goto retry;
465 /* FALL THROUGH */
466 case FSID_MAJOR_MINOR:
467 case FSID_ENCODE_DEV:
Jan Blunck54775492008-02-14 19:38:39 -0800468 if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
NeilBrownb41eeef2007-05-09 02:34:57 -0700469 & FS_REQUIRES_DEV))
470 goto retry;
471 break;
472 case FSID_NUM:
473 if (! (exp->ex_flags & NFSEXP_FSID))
474 goto retry;
475 break;
476 case FSID_UUID8:
477 case FSID_UUID16:
478 if (!root_export)
479 goto retry;
480 /* fall through */
481 case FSID_UUID4_INUM:
482 case FSID_UUID16_INUM:
483 if (exp->ex_uuid == NULL)
484 goto retry;
485 break;
486 }
Steve Dickson30fa8c02009-01-07 16:54:30 -0500487 } else if (exp->ex_flags & NFSEXP_FSID) {
488 fsid_type = FSID_NUM;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800489 } else if (exp->ex_uuid) {
490 if (fhp->fh_maxsize >= 64) {
491 if (root_export)
492 fsid_type = FSID_UUID16;
493 else
494 fsid_type = FSID_UUID16_INUM;
495 } else {
496 if (root_export)
497 fsid_type = FSID_UUID8;
498 else
499 fsid_type = FSID_UUID4_INUM;
500 }
Steve Dickson30fa8c02009-01-07 16:54:30 -0500501 } else if (!old_valid_dev(ex_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800503 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800504 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800505 fsid_type = FSID_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 if (ref_fh == fhp)
508 fh_put(ref_fh);
509
510 if (fhp->fh_locked || fhp->fh_dentry) {
511 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800512 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
514 if (fhp->fh_maxsize < NFS_FHSIZE)
515 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800516 fhp->fh_maxsize,
517 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 fhp->fh_dentry = dget(dentry); /* our internal copy */
520 fhp->fh_export = exp;
521 cache_get(&exp->h);
522
NeilBrown982aedf2007-02-14 00:33:11 -0800523 if (version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 /* old style filehandle please */
525 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
526 fhp->fh_handle.fh_size = NFS_FHSIZE;
527 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
528 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
529 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
NeilBrown982aedf2007-02-14 00:33:11 -0800530 fhp->fh_handle.ofh_xino =
Jan Blunck54775492008-02-14 19:38:39 -0800531 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
533 if (inode)
534 _fh_update_old(dentry, exp, &fhp->fh_handle);
535 } else {
536 int len;
537 fhp->fh_handle.fh_version = 1;
538 fhp->fh_handle.fh_auth_type = 0;
539 datap = fhp->fh_handle.fh_auth+0;
NeilBrown982aedf2007-02-14 00:33:11 -0800540 fhp->fh_handle.fh_fsid_type = fsid_type;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800541 mk_fsid(fsid_type, datap, ex_dev,
Jan Blunck54775492008-02-14 19:38:39 -0800542 exp->ex_path.dentry->d_inode->i_ino,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800543 exp->ex_fsid, exp->ex_uuid);
544
NeilBrown982aedf2007-02-14 00:33:11 -0800545 len = key_len(fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 datap += len/4;
547 fhp->fh_handle.fh_size = 4 + len;
548
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700549 if (inode)
550 _fh_update(fhp, exp, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (fhp->fh_handle.fh_fileid_type == 255)
552 return nfserr_opnotsupp;
553 }
554
555 nfsd_nr_verified++;
556 return 0;
557}
558
559/*
560 * Update file handle information after changing a dentry.
561 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
562 */
Al Viro83b11342006-10-19 23:28:55 -0700563__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564fh_update(struct svc_fh *fhp)
565{
566 struct dentry *dentry;
NeilBrown982aedf2007-02-14 00:33:11 -0800567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if (!fhp->fh_dentry)
569 goto out_bad;
570
571 dentry = fhp->fh_dentry;
572 if (!dentry->d_inode)
573 goto out_negative;
574 if (fhp->fh_handle.fh_version != 1) {
575 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
576 } else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700577 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
NeilBrown4c9608b2006-06-30 01:56:11 -0700578 goto out;
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700579
580 _fh_update(fhp, fhp->fh_export, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 if (fhp->fh_handle.fh_fileid_type == 255)
582 return nfserr_opnotsupp;
583 }
584out:
585 return 0;
586
587out_bad:
588 printk(KERN_ERR "fh_update: fh not verified!\n");
589 goto out;
590out_negative:
591 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
592 dentry->d_parent->d_name.name, dentry->d_name.name);
593 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596/*
597 * Release a file handle.
598 */
599void
600fh_put(struct svc_fh *fhp)
601{
602 struct dentry * dentry = fhp->fh_dentry;
603 struct svc_export * exp = fhp->fh_export;
604 if (dentry) {
605 fh_unlock(fhp);
606 fhp->fh_dentry = NULL;
607 dput(dentry);
608#ifdef CONFIG_NFSD_V3
609 fhp->fh_pre_saved = 0;
610 fhp->fh_post_saved = 0;
611#endif
612 nfsd_nr_put++;
613 }
614 if (exp) {
NeilBrownbaab9352006-03-27 01:15:09 -0800615 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 fhp->fh_export = NULL;
617 }
618 return;
619}
620
621/*
622 * Shorthand for dprintk()'s
623 */
624char * SVCFH_fmt(struct svc_fh *fhp)
625{
626 struct knfsd_fh *fh = &fhp->fh_handle;
627
628 static char buf[80];
629 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
630 fh->fh_size,
631 fh->fh_base.fh_pad[0],
632 fh->fh_base.fh_pad[1],
633 fh->fh_base.fh_pad[2],
634 fh->fh_base.fh_pad[3],
635 fh->fh_base.fh_pad[4],
636 fh->fh_base.fh_pad[5]);
637 return buf;
638}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800639
640enum fsid_source fsid_source(struct svc_fh *fhp)
641{
642 if (fhp->fh_handle.fh_version != 1)
643 return FSIDSOURCE_DEV;
644 switch(fhp->fh_handle.fh_fsid_type) {
645 case FSID_DEV:
646 case FSID_ENCODE_DEV:
647 case FSID_MAJOR_MINOR:
Jan Blunck54775492008-02-14 19:38:39 -0800648 if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
Neil Brownb8da0d12007-09-05 17:22:13 -0400649 & FS_REQUIRES_DEV)
650 return FSIDSOURCE_DEV;
651 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800652 case FSID_NUM:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800653 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
654 return FSIDSOURCE_FSID;
Neil Brownb8da0d12007-09-05 17:22:13 -0400655 break;
656 default:
657 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800658 }
Neil Brownb8da0d12007-09-05 17:22:13 -0400659 /* either a UUID type filehandle, or the filehandle doesn't
660 * match the export.
661 */
662 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
663 return FSIDSOURCE_FSID;
664 if (fhp->fh_export->ex_uuid)
665 return FSIDSOURCE_UUID;
666 return FSIDSOURCE_DEV;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800667}