blob: d0d8a217a3ea903ce45fa6be1112733c2a12a534 [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 Fields0a3adad2009-11-04 18:12:35 -050025#include "vfs.h"
J. Bruce Fields2e8138a2007-11-15 17:05:43 -050026#include "auth.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#define NFSDDBG_FACILITY NFSDDBG_FH
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
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);
Jan Blunck54775492008-02-14 19:38:39 -080048 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 /* make sure parents give x permission to user */
50 int err;
51 parent = dget_parent(tdentry);
Al Virof419a2e2008-07-22 00:07:17 -040052 err = inode_permission(parent->d_inode, MAY_EXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 if (err < 0) {
54 dput(parent);
55 break;
56 }
57 dput(tdentry);
58 tdentry = parent;
59 }
Jan Blunck54775492008-02-14 19:38:39 -080060 if (tdentry != exp->ex_path.dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
Jan Blunck54775492008-02-14 19:38:39 -080062 rv = (tdentry == exp->ex_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 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
J. Bruce Fields6fa02832007-11-12 16:05:03 -050097static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
98 struct svc_export *exp)
99{
100 /* Check if the request originated from a secure port. */
101 if (!rqstp->rq_secure && EX_SECURE(exp)) {
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300102 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500103 dprintk(KERN_WARNING
104 "nfsd: request from insecure port %s!\n",
105 svc_print_addr(rqstp, buf, sizeof(buf)));
106 return nfserr_perm;
107 }
108
109 /* Set user creds for this exportpoint */
110 return nfserrno(nfsd_setuser(rqstp, exp));
111}
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400114 * Use the given filehandle to look up the corresponding export and
115 * dentry. On success, the results are used to set fh_export and
116 * fh_dentry.
117 */
118static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
119{
120 struct knfsd_fh *fh = &fhp->fh_handle;
121 struct fid *fid = NULL, sfid;
122 struct svc_export *exp;
123 struct dentry *dentry;
124 int fileid_type;
125 int data_left = fh->fh_size/4;
126 __be32 error;
127
128 error = nfserr_stale;
129 if (rqstp->rq_vers > 2)
130 error = nfserr_badhandle;
131 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
132 return nfserr_nofilehandle;
133
134 if (fh->fh_version == 1) {
135 int len;
136
137 if (--data_left < 0)
138 return error;
139 if (fh->fh_auth_type != 0)
140 return error;
141 len = key_len(fh->fh_fsid_type) / 4;
142 if (len == 0)
143 return error;
144 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
145 /* deprecated, convert to type 3 */
146 len = key_len(FSID_ENCODE_DEV)/4;
147 fh->fh_fsid_type = FSID_ENCODE_DEV;
148 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
149 fh->fh_fsid[1] = fh->fh_fsid[2];
150 }
151 data_left -= len;
152 if (data_left < 0)
153 return error;
154 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
155 fid = (struct fid *)(fh->fh_auth + len);
156 } else {
157 __u32 tfh[2];
158 dev_t xdev;
159 ino_t xino;
160
161 if (fh->fh_size != NFS_FHSIZE)
162 return error;
163 /* assume old filehandle format */
164 xdev = old_decode_dev(fh->ofh_xdev);
165 xino = u32_to_ino_t(fh->ofh_xino);
166 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
167 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
168 }
169
170 error = nfserr_stale;
171 if (PTR_ERR(exp) == -ENOENT)
172 return error;
173
174 if (IS_ERR(exp))
175 return nfserrno(PTR_ERR(exp));
176
Neil Brown496d6c32008-05-08 13:03:09 +1000177 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
178 /* Elevate privileges so that the lack of 'r' or 'x'
179 * permission on some parent directory will
180 * not stop exportfs_decode_fh from being able
181 * to reconnect a directory into the dentry cache.
182 * The same problem can affect "SUBTREECHECK" exports,
183 * but as nfsd_acceptable depends on correct
184 * access control settings being in effect, we cannot
185 * fix that case easily.
186 */
David Howellsd84f4f92008-11-14 10:39:23 +1100187 struct cred *new = prepare_creds();
188 if (!new)
189 return nfserrno(-ENOMEM);
190 new->cap_effective =
191 cap_raise_nfsd_set(new->cap_effective,
192 new->cap_permitted);
193 put_cred(override_creds(new));
194 put_cred(new);
Neil Brown496d6c32008-05-08 13:03:09 +1000195 } else {
196 error = nfsd_setuser_and_check_port(rqstp, exp);
197 if (error)
198 goto out;
199 }
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400200
201 /*
202 * Look up the dentry using the NFS file handle.
203 */
204 error = nfserr_stale;
205 if (rqstp->rq_vers > 2)
206 error = nfserr_badhandle;
207
208 if (fh->fh_version != 1) {
209 sfid.i32.ino = fh->ofh_ino;
210 sfid.i32.gen = fh->ofh_generation;
211 sfid.i32.parent_ino = fh->ofh_dirino;
212 fid = &sfid;
213 data_left = 3;
214 if (fh->ofh_dirino == 0)
215 fileid_type = FILEID_INO32_GEN;
216 else
217 fileid_type = FILEID_INO32_GEN_PARENT;
218 } else
219 fileid_type = fh->fh_fileid_type;
220
221 if (fileid_type == FILEID_ROOT)
222 dentry = dget(exp->ex_path.dentry);
223 else {
224 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
225 data_left, fileid_type,
226 nfsd_acceptable, exp);
227 }
228 if (dentry == NULL)
229 goto out;
230 if (IS_ERR(dentry)) {
231 if (PTR_ERR(dentry) != -EINVAL)
232 error = nfserrno(PTR_ERR(dentry));
233 goto out;
234 }
235
Neil Brown496d6c32008-05-08 13:03:09 +1000236 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
237 error = nfsd_setuser_and_check_port(rqstp, exp);
238 if (error) {
239 dput(dentry);
240 goto out;
241 }
242 }
243
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400244 if (S_ISDIR(dentry->d_inode->i_mode) &&
245 (dentry->d_flags & DCACHE_DISCONNECTED)) {
246 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
247 dentry->d_parent->d_name.name, dentry->d_name.name);
248 }
249
250 fhp->fh_dentry = dentry;
251 fhp->fh_export = exp;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400252 return 0;
253out:
254 exp_put(exp);
255 return error;
256}
257
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400258/**
259 * fh_verify - filehandle lookup and access checking
260 * @rqstp: pointer to current rpc request
261 * @fhp: filehandle to be verified
262 * @type: expected type of object pointed to by filehandle
263 * @access: type of access needed to object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400265 * Look up a dentry from the on-the-wire filehandle, check the client's
266 * access to the export, and set the current task's credentials.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400268 * Regardless of success or failure of fh_verify(), fh_put() should be
269 * called on @fhp when the caller is finished with the filehandle.
270 *
271 * fh_verify() may be called multiple times on a given filehandle, for
272 * example, when processing an NFSv4 compound. The first call will look
273 * up a dentry using the on-the-wire filehandle. Subsequent calls will
274 * skip the lookup and just perform the other checks and possibly change
275 * the current task's credentials.
276 *
277 * @type specifies the type of object expected using one of the S_IF*
278 * constants defined in include/linux/stat.h. The caller may use zero
279 * to indicate that it doesn't care, or a negative integer to indicate
280 * that it expects something not of the given type.
281 *
282 * @access is formed from the NFSD_MAY_* constants defined in
283 * include/linux/nfsd/nfsd.h.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 */
Al Viro83b11342006-10-19 23:28:55 -0700285__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
287{
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400288 struct svc_export *exp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 struct dentry *dentry;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400290 __be32 error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!fhp->fh_dentry) {
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400295 error = nfsd_set_fh_dentry(rqstp, fhp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700296 if (error)
297 goto out;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400298 dentry = fhp->fh_dentry;
299 exp = fhp->fh_export;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 } else {
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500301 /*
302 * just rechecking permissions
303 * (e.g. nfsproc_create calls fh_verify, then nfsd_create
304 * does as well)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 */
306 dprintk("nfsd: fh_verify - just checking\n");
307 dentry = fhp->fh_dentry;
308 exp = fhp->fh_export;
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500309 /*
310 * Set user creds for this exportpoint; necessary even
NeilBrownd1bbf142006-07-30 03:03:16 -0700311 * in the "just checking" case because this may be a
312 * filehandle that was created by fh_compose, and that
313 * is about to be used in another nfsv4 compound
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500314 * operation.
315 */
316 error = nfsd_setuser_and_check_port(rqstp, exp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700317 if (error)
318 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
322 if (error)
323 goto out;
324
J. Bruce Fields04716e62008-08-07 13:00:20 -0400325 /*
326 * pseudoflavor restrictions are not enforced on NLM,
327 * which clients virtually always use auth_sys for,
328 * even while using RPCSEC_GSS for NFS.
329 */
330 if (access & NFSD_MAY_LOCK)
331 goto skip_pseudoflavor_check;
332 /*
333 * Clients may expect to be able to use auth_sys during mount,
334 * even if they use gss for everything else; see section 2.3.2
335 * of rfc 2623.
336 */
337 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
338 && exp->ex_path.dentry == dentry)
339 goto skip_pseudoflavor_check;
Andy Adamson32c1eb02007-07-17 04:04:48 -0700340
J. Bruce Fields04716e62008-08-07 13:00:20 -0400341 error = check_nfsd_access(exp, rqstp);
342 if (error)
343 goto out;
344
345skip_pseudoflavor_check:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700347 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800350 dprintk("fh_verify: %s/%s permission failure, "
351 "acc=%x, error=%d\n",
352 dentry->d_parent->d_name.name,
353 dentry->d_name.name,
Al Virofc2dd2e2007-02-01 13:52:43 +0000354 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (error == nfserr_stale)
358 nfsdstats.fh_stale++;
359 return error;
360}
361
362
363/*
364 * Compose a file handle for an NFS reply.
365 *
366 * Note that when first composed, the dentry may not yet have
367 * an inode. In this case a call to fh_update should be made
368 * before the fh goes out on the wire ...
369 */
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700370static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
371 struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
Jan Blunck54775492008-02-14 19:38:39 -0800373 if (dentry != exp->ex_path.dentry) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700374 struct fid *fid = (struct fid *)
375 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
376 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
377 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700379 fhp->fh_handle.fh_fileid_type =
380 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
381 fhp->fh_handle.fh_size += maxsize * 4;
382 } else {
383 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
387/*
388 * for composing old style file handles
389 */
390static inline void _fh_update_old(struct dentry *dentry,
391 struct svc_export *exp,
392 struct knfsd_fh *fh)
393{
394 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
395 fh->ofh_generation = dentry->d_inode->i_generation;
396 if (S_ISDIR(dentry->d_inode->i_mode) ||
397 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
398 fh->ofh_dirino = 0;
399}
400
J. Bruce Fields8e498752009-09-02 19:31:32 -0400401static bool is_root_export(struct svc_export *exp)
402{
403 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
404}
405
406static struct super_block *exp_sb(struct svc_export *exp)
407{
408 return exp->ex_path.dentry->d_inode->i_sb;
409}
410
411static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
412{
413 switch (fsid_type) {
414 case FSID_DEV:
415 if (!old_valid_dev(exp_sb(exp)->s_dev))
416 return 0;
417 /* FALL THROUGH */
418 case FSID_MAJOR_MINOR:
419 case FSID_ENCODE_DEV:
420 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
421 case FSID_NUM:
422 return exp->ex_flags & NFSEXP_FSID;
423 case FSID_UUID8:
424 case FSID_UUID16:
425 if (!is_root_export(exp))
426 return 0;
427 /* fall through */
428 case FSID_UUID4_INUM:
429 case FSID_UUID16_INUM:
430 return exp->ex_uuid != NULL;
431 }
432 return 1;
433}
434
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400435
436static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
NeilBrownb41eeef2007-05-09 02:34:57 -0700438 u8 version;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400439 u8 fsid_type;
440retry:
NeilBrownb41eeef2007-05-09 02:34:57 -0700441 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700442 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800443 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700444 fsid_type = ref_fh->fh_handle.fh_fsid_type;
445
NeilBrownb41eeef2007-05-09 02:34:57 -0700446 ref_fh = NULL;
447
448 switch (version) {
449 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800450 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700451 break;
452 case 1:
453 break;
454 default:
455 goto retry;
456 }
457
J. Bruce Fields8e498752009-09-02 19:31:32 -0400458 /*
459 * As the fsid -> filesystem mapping was guided by
460 * user-space, there is no guarantee that the filesystem
461 * actually supports that fsid type. If it doesn't we
462 * loop around again without ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800463 */
J. Bruce Fields8e498752009-09-02 19:31:32 -0400464 if (!fsid_type_ok_for_exp(fsid_type, exp))
465 goto retry;
Steve Dickson30fa8c02009-01-07 16:54:30 -0500466 } else if (exp->ex_flags & NFSEXP_FSID) {
467 fsid_type = FSID_NUM;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800468 } else if (exp->ex_uuid) {
469 if (fhp->fh_maxsize >= 64) {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400470 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800471 fsid_type = FSID_UUID16;
472 else
473 fsid_type = FSID_UUID16_INUM;
474 } else {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400475 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800476 fsid_type = FSID_UUID8;
477 else
478 fsid_type = FSID_UUID4_INUM;
479 }
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400480 } else if (!old_valid_dev(exp_sb(exp)->s_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800482 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800483 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800484 fsid_type = FSID_DEV;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400485 fhp->fh_handle.fh_version = version;
486 if (version)
487 fhp->fh_handle.fh_fsid_type = fsid_type;
488}
489
490__be32
491fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
492 struct svc_fh *ref_fh)
493{
494 /* ref_fh is a reference file handle.
495 * if it is non-null and for the same filesystem, then we should compose
496 * a filehandle which is of the same version, where possible.
497 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
498 * Then create a 32byte filehandle using nfs_fhbase_old
499 *
500 */
501
502 struct inode * inode = dentry->d_inode;
503 struct dentry *parent = dentry->d_parent;
504 __u32 *datap;
505 dev_t ex_dev = exp_sb(exp)->s_dev;
506
507 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
508 MAJOR(ex_dev), MINOR(ex_dev),
509 (long) exp->ex_path.dentry->d_inode->i_ino,
510 parent->d_name.name, dentry->d_name.name,
511 (inode ? inode->i_ino : 0));
512
513 /* Choose filehandle version and fsid type based on
514 * the reference filehandle (if it is in the same export)
515 * or the export options.
516 */
517 set_version_and_fsid_type(fhp, exp, ref_fh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 if (ref_fh == fhp)
520 fh_put(ref_fh);
521
522 if (fhp->fh_locked || fhp->fh_dentry) {
523 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800524 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
526 if (fhp->fh_maxsize < NFS_FHSIZE)
527 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800528 fhp->fh_maxsize,
529 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 fhp->fh_dentry = dget(dentry); /* our internal copy */
532 fhp->fh_export = exp;
533 cache_get(&exp->h);
534
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400535 if (fhp->fh_handle.fh_version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 /* old style filehandle please */
537 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
538 fhp->fh_handle.fh_size = NFS_FHSIZE;
539 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
540 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
541 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
NeilBrown982aedf2007-02-14 00:33:11 -0800542 fhp->fh_handle.ofh_xino =
Jan Blunck54775492008-02-14 19:38:39 -0800543 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
545 if (inode)
546 _fh_update_old(dentry, exp, &fhp->fh_handle);
547 } else {
548 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 fhp->fh_handle.fh_auth_type = 0;
550 datap = fhp->fh_handle.fh_auth+0;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400551 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
Jan Blunck54775492008-02-14 19:38:39 -0800552 exp->ex_path.dentry->d_inode->i_ino,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800553 exp->ex_fsid, exp->ex_uuid);
554
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400555 len = key_len(fhp->fh_handle.fh_fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 datap += len/4;
557 fhp->fh_handle.fh_size = 4 + len;
558
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700559 if (inode)
560 _fh_update(fhp, exp, dentry);
J. Bruce Fields1be10a82009-09-04 11:59:32 -0400561 if (fhp->fh_handle.fh_fileid_type == 255) {
562 fh_put(fhp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 return nfserr_opnotsupp;
J. Bruce Fields1be10a82009-09-04 11:59:32 -0400564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return 0;
568}
569
570/*
571 * Update file handle information after changing a dentry.
572 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
573 */
Al Viro83b11342006-10-19 23:28:55 -0700574__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575fh_update(struct svc_fh *fhp)
576{
577 struct dentry *dentry;
NeilBrown982aedf2007-02-14 00:33:11 -0800578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (!fhp->fh_dentry)
580 goto out_bad;
581
582 dentry = fhp->fh_dentry;
583 if (!dentry->d_inode)
584 goto out_negative;
585 if (fhp->fh_handle.fh_version != 1) {
586 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
587 } else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700588 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
NeilBrown4c9608b2006-06-30 01:56:11 -0700589 goto out;
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700590
591 _fh_update(fhp, fhp->fh_export, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (fhp->fh_handle.fh_fileid_type == 255)
593 return nfserr_opnotsupp;
594 }
595out:
596 return 0;
597
598out_bad:
599 printk(KERN_ERR "fh_update: fh not verified!\n");
600 goto out;
601out_negative:
602 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
603 dentry->d_parent->d_name.name, dentry->d_name.name);
604 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605}
606
607/*
608 * Release a file handle.
609 */
610void
611fh_put(struct svc_fh *fhp)
612{
613 struct dentry * dentry = fhp->fh_dentry;
614 struct svc_export * exp = fhp->fh_export;
615 if (dentry) {
616 fh_unlock(fhp);
617 fhp->fh_dentry = NULL;
618 dput(dentry);
619#ifdef CONFIG_NFSD_V3
620 fhp->fh_pre_saved = 0;
621 fhp->fh_post_saved = 0;
622#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 }
624 if (exp) {
NeilBrownbaab9352006-03-27 01:15:09 -0800625 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 fhp->fh_export = NULL;
627 }
628 return;
629}
630
631/*
632 * Shorthand for dprintk()'s
633 */
634char * SVCFH_fmt(struct svc_fh *fhp)
635{
636 struct knfsd_fh *fh = &fhp->fh_handle;
637
638 static char buf[80];
639 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
640 fh->fh_size,
641 fh->fh_base.fh_pad[0],
642 fh->fh_base.fh_pad[1],
643 fh->fh_base.fh_pad[2],
644 fh->fh_base.fh_pad[3],
645 fh->fh_base.fh_pad[4],
646 fh->fh_base.fh_pad[5]);
647 return buf;
648}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800649
650enum fsid_source fsid_source(struct svc_fh *fhp)
651{
652 if (fhp->fh_handle.fh_version != 1)
653 return FSIDSOURCE_DEV;
654 switch(fhp->fh_handle.fh_fsid_type) {
655 case FSID_DEV:
656 case FSID_ENCODE_DEV:
657 case FSID_MAJOR_MINOR:
J. Bruce Fields8e498752009-09-02 19:31:32 -0400658 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
Neil Brownb8da0d12007-09-05 17:22:13 -0400659 return FSIDSOURCE_DEV;
660 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800661 case FSID_NUM:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800662 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
663 return FSIDSOURCE_FSID;
Neil Brownb8da0d12007-09-05 17:22:13 -0400664 break;
665 default:
666 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800667 }
Neil Brownb8da0d12007-09-05 17:22:13 -0400668 /* either a UUID type filehandle, or the filehandle doesn't
669 * match the export.
670 */
671 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
672 return FSIDSOURCE_FSID;
673 if (fhp->fh_export->ex_uuid)
674 return FSIDSOURCE_UUID;
675 return FSIDSOURCE_DEV;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800676}