blob: a77efb8c22437e156fd96574ecfbb22d1a438762 [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
236 if (S_ISDIR(dentry->d_inode->i_mode) &&
237 (dentry->d_flags & DCACHE_DISCONNECTED)) {
238 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
239 dentry->d_parent->d_name.name, dentry->d_name.name);
240 }
241
242 fhp->fh_dentry = dentry;
243 fhp->fh_export = exp;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400244 return 0;
245out:
246 exp_put(exp);
247 return error;
248}
249
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400250/**
251 * fh_verify - filehandle lookup and access checking
252 * @rqstp: pointer to current rpc request
253 * @fhp: filehandle to be verified
254 * @type: expected type of object pointed to by filehandle
255 * @access: type of access needed to object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400257 * Look up a dentry from the on-the-wire filehandle, check the client's
258 * access to the export, and set the current task's credentials.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400260 * Regardless of success or failure of fh_verify(), fh_put() should be
261 * called on @fhp when the caller is finished with the filehandle.
262 *
263 * fh_verify() may be called multiple times on a given filehandle, for
264 * example, when processing an NFSv4 compound. The first call will look
265 * up a dentry using the on-the-wire filehandle. Subsequent calls will
266 * skip the lookup and just perform the other checks and possibly change
267 * the current task's credentials.
268 *
269 * @type specifies the type of object expected using one of the S_IF*
270 * constants defined in include/linux/stat.h. The caller may use zero
271 * to indicate that it doesn't care, or a negative integer to indicate
272 * that it expects something not of the given type.
273 *
274 * @access is formed from the NFSD_MAY_* constants defined in
275 * include/linux/nfsd/nfsd.h.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 */
Al Viro83b11342006-10-19 23:28:55 -0700277__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
279{
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400280 struct svc_export *exp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 struct dentry *dentry;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400282 __be32 error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (!fhp->fh_dentry) {
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400287 error = nfsd_set_fh_dentry(rqstp, fhp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700288 if (error)
289 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
J. Bruce Fields864f0f62009-11-25 17:42:05 -0500291 dentry = fhp->fh_dentry;
292 exp = fhp->fh_export;
293 /*
294 * We still have to do all these permission checks, even when
295 * fh_dentry is already set:
296 * - fh_verify may be called multiple times with different
297 * "access" arguments (e.g. nfsd_proc_create calls
298 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in
299 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
300 * - in the NFSv4 case, the filehandle may have been filled
301 * in by fh_compose, and given a dentry, but further
302 * compound operations performed with that filehandle
303 * still need permissions checks. In the worst case, a
304 * mountpoint crossing may have changed the export
305 * options, and we may now need to use a different uid
306 * (for example, if different id-squashing options are in
307 * effect on the new filesystem).
308 */
309 error = nfsd_setuser_and_check_port(rqstp, exp);
310 if (error)
311 goto out;
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
314 if (error)
315 goto out;
316
J. Bruce Fields04716e62008-08-07 13:00:20 -0400317 /*
318 * pseudoflavor restrictions are not enforced on NLM,
319 * which clients virtually always use auth_sys for,
320 * even while using RPCSEC_GSS for NFS.
321 */
322 if (access & NFSD_MAY_LOCK)
323 goto skip_pseudoflavor_check;
324 /*
325 * Clients may expect to be able to use auth_sys during mount,
326 * even if they use gss for everything else; see section 2.3.2
327 * of rfc 2623.
328 */
329 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
330 && exp->ex_path.dentry == dentry)
331 goto skip_pseudoflavor_check;
Andy Adamson32c1eb02007-07-17 04:04:48 -0700332
J. Bruce Fields04716e62008-08-07 13:00:20 -0400333 error = check_nfsd_access(exp, rqstp);
334 if (error)
335 goto out;
336
337skip_pseudoflavor_check:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700339 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800342 dprintk("fh_verify: %s/%s permission failure, "
343 "acc=%x, error=%d\n",
344 dentry->d_parent->d_name.name,
345 dentry->d_name.name,
Al Virofc2dd2e2007-02-01 13:52:43 +0000346 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (error == nfserr_stale)
350 nfsdstats.fh_stale++;
351 return error;
352}
353
354
355/*
356 * Compose a file handle for an NFS reply.
357 *
358 * Note that when first composed, the dentry may not yet have
359 * an inode. In this case a call to fh_update should be made
360 * before the fh goes out on the wire ...
361 */
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700362static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
363 struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
Jan Blunck54775492008-02-14 19:38:39 -0800365 if (dentry != exp->ex_path.dentry) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700366 struct fid *fid = (struct fid *)
367 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
368 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
369 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700371 fhp->fh_handle.fh_fileid_type =
372 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
373 fhp->fh_handle.fh_size += maxsize * 4;
374 } else {
375 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
379/*
380 * for composing old style file handles
381 */
382static inline void _fh_update_old(struct dentry *dentry,
383 struct svc_export *exp,
384 struct knfsd_fh *fh)
385{
386 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
387 fh->ofh_generation = dentry->d_inode->i_generation;
388 if (S_ISDIR(dentry->d_inode->i_mode) ||
389 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
390 fh->ofh_dirino = 0;
391}
392
J. Bruce Fields8e498752009-09-02 19:31:32 -0400393static bool is_root_export(struct svc_export *exp)
394{
395 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
396}
397
398static struct super_block *exp_sb(struct svc_export *exp)
399{
400 return exp->ex_path.dentry->d_inode->i_sb;
401}
402
403static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
404{
405 switch (fsid_type) {
406 case FSID_DEV:
407 if (!old_valid_dev(exp_sb(exp)->s_dev))
408 return 0;
409 /* FALL THROUGH */
410 case FSID_MAJOR_MINOR:
411 case FSID_ENCODE_DEV:
412 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
413 case FSID_NUM:
414 return exp->ex_flags & NFSEXP_FSID;
415 case FSID_UUID8:
416 case FSID_UUID16:
417 if (!is_root_export(exp))
418 return 0;
419 /* fall through */
420 case FSID_UUID4_INUM:
421 case FSID_UUID16_INUM:
422 return exp->ex_uuid != NULL;
423 }
424 return 1;
425}
426
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400427
428static 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 -0700429{
NeilBrownb41eeef2007-05-09 02:34:57 -0700430 u8 version;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400431 u8 fsid_type;
432retry:
NeilBrownb41eeef2007-05-09 02:34:57 -0700433 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700434 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800435 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700436 fsid_type = ref_fh->fh_handle.fh_fsid_type;
437
NeilBrownb41eeef2007-05-09 02:34:57 -0700438 ref_fh = NULL;
439
440 switch (version) {
441 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800442 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700443 break;
444 case 1:
445 break;
446 default:
447 goto retry;
448 }
449
J. Bruce Fields8e498752009-09-02 19:31:32 -0400450 /*
451 * As the fsid -> filesystem mapping was guided by
452 * user-space, there is no guarantee that the filesystem
453 * actually supports that fsid type. If it doesn't we
454 * loop around again without ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800455 */
J. Bruce Fields8e498752009-09-02 19:31:32 -0400456 if (!fsid_type_ok_for_exp(fsid_type, exp))
457 goto retry;
Steve Dickson30fa8c02009-01-07 16:54:30 -0500458 } else if (exp->ex_flags & NFSEXP_FSID) {
459 fsid_type = FSID_NUM;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800460 } else if (exp->ex_uuid) {
461 if (fhp->fh_maxsize >= 64) {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400462 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800463 fsid_type = FSID_UUID16;
464 else
465 fsid_type = FSID_UUID16_INUM;
466 } else {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400467 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800468 fsid_type = FSID_UUID8;
469 else
470 fsid_type = FSID_UUID4_INUM;
471 }
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400472 } else if (!old_valid_dev(exp_sb(exp)->s_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800474 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800475 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800476 fsid_type = FSID_DEV;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400477 fhp->fh_handle.fh_version = version;
478 if (version)
479 fhp->fh_handle.fh_fsid_type = fsid_type;
480}
481
482__be32
483fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
484 struct svc_fh *ref_fh)
485{
486 /* ref_fh is a reference file handle.
487 * if it is non-null and for the same filesystem, then we should compose
488 * a filehandle which is of the same version, where possible.
489 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
490 * Then create a 32byte filehandle using nfs_fhbase_old
491 *
492 */
493
494 struct inode * inode = dentry->d_inode;
495 struct dentry *parent = dentry->d_parent;
496 __u32 *datap;
497 dev_t ex_dev = exp_sb(exp)->s_dev;
498
499 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
500 MAJOR(ex_dev), MINOR(ex_dev),
501 (long) exp->ex_path.dentry->d_inode->i_ino,
502 parent->d_name.name, dentry->d_name.name,
503 (inode ? inode->i_ino : 0));
504
505 /* Choose filehandle version and fsid type based on
506 * the reference filehandle (if it is in the same export)
507 * or the export options.
508 */
509 set_version_and_fsid_type(fhp, exp, ref_fh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 if (ref_fh == fhp)
512 fh_put(ref_fh);
513
514 if (fhp->fh_locked || fhp->fh_dentry) {
515 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800516 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518 if (fhp->fh_maxsize < NFS_FHSIZE)
519 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
NeilBrown982aedf2007-02-14 00:33:11 -0800520 fhp->fh_maxsize,
521 parent->d_name.name, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 fhp->fh_dentry = dget(dentry); /* our internal copy */
524 fhp->fh_export = exp;
525 cache_get(&exp->h);
526
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400527 if (fhp->fh_handle.fh_version == 0xca) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 /* old style filehandle please */
529 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
530 fhp->fh_handle.fh_size = NFS_FHSIZE;
531 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
532 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
533 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
NeilBrown982aedf2007-02-14 00:33:11 -0800534 fhp->fh_handle.ofh_xino =
Jan Blunck54775492008-02-14 19:38:39 -0800535 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
537 if (inode)
538 _fh_update_old(dentry, exp, &fhp->fh_handle);
539 } else {
540 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 fhp->fh_handle.fh_auth_type = 0;
542 datap = fhp->fh_handle.fh_auth+0;
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400543 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
Jan Blunck54775492008-02-14 19:38:39 -0800544 exp->ex_path.dentry->d_inode->i_ino,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800545 exp->ex_fsid, exp->ex_uuid);
546
J. Bruce Fieldsbc6c53d2009-09-02 19:50:40 -0400547 len = key_len(fhp->fh_handle.fh_fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 datap += len/4;
549 fhp->fh_handle.fh_size = 4 + len;
550
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700551 if (inode)
552 _fh_update(fhp, exp, dentry);
J. Bruce Fields1be10a82009-09-04 11:59:32 -0400553 if (fhp->fh_handle.fh_fileid_type == 255) {
554 fh_put(fhp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 return nfserr_opnotsupp;
J. Bruce Fields1be10a82009-09-04 11:59:32 -0400556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return 0;
560}
561
562/*
563 * Update file handle information after changing a dentry.
564 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
565 */
Al Viro83b11342006-10-19 23:28:55 -0700566__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567fh_update(struct svc_fh *fhp)
568{
569 struct dentry *dentry;
NeilBrown982aedf2007-02-14 00:33:11 -0800570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if (!fhp->fh_dentry)
572 goto out_bad;
573
574 dentry = fhp->fh_dentry;
575 if (!dentry->d_inode)
576 goto out_negative;
577 if (fhp->fh_handle.fh_version != 1) {
578 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
579 } else {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700580 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
NeilBrown4c9608b2006-06-30 01:56:11 -0700581 goto out;
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700582
583 _fh_update(fhp, fhp->fh_export, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 if (fhp->fh_handle.fh_fileid_type == 255)
585 return nfserr_opnotsupp;
586 }
587out:
588 return 0;
589
590out_bad:
591 printk(KERN_ERR "fh_update: fh not verified!\n");
592 goto out;
593out_negative:
594 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
595 dentry->d_parent->d_name.name, dentry->d_name.name);
596 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599/*
600 * Release a file handle.
601 */
602void
603fh_put(struct svc_fh *fhp)
604{
605 struct dentry * dentry = fhp->fh_dentry;
606 struct svc_export * exp = fhp->fh_export;
607 if (dentry) {
608 fh_unlock(fhp);
609 fhp->fh_dentry = NULL;
610 dput(dentry);
611#ifdef CONFIG_NFSD_V3
612 fhp->fh_pre_saved = 0;
613 fhp->fh_post_saved = 0;
614#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
616 if (exp) {
NeilBrownbaab9352006-03-27 01:15:09 -0800617 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 fhp->fh_export = NULL;
619 }
620 return;
621}
622
623/*
624 * Shorthand for dprintk()'s
625 */
626char * SVCFH_fmt(struct svc_fh *fhp)
627{
628 struct knfsd_fh *fh = &fhp->fh_handle;
629
630 static char buf[80];
631 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
632 fh->fh_size,
633 fh->fh_base.fh_pad[0],
634 fh->fh_base.fh_pad[1],
635 fh->fh_base.fh_pad[2],
636 fh->fh_base.fh_pad[3],
637 fh->fh_base.fh_pad[4],
638 fh->fh_base.fh_pad[5]);
639 return buf;
640}
NeilBrownaf6a4e22007-02-14 00:33:12 -0800641
642enum fsid_source fsid_source(struct svc_fh *fhp)
643{
644 if (fhp->fh_handle.fh_version != 1)
645 return FSIDSOURCE_DEV;
646 switch(fhp->fh_handle.fh_fsid_type) {
647 case FSID_DEV:
648 case FSID_ENCODE_DEV:
649 case FSID_MAJOR_MINOR:
J. Bruce Fields8e498752009-09-02 19:31:32 -0400650 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
Neil Brownb8da0d12007-09-05 17:22:13 -0400651 return FSIDSOURCE_DEV;
652 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800653 case FSID_NUM:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800654 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
655 return FSIDSOURCE_FSID;
Neil Brownb8da0d12007-09-05 17:22:13 -0400656 break;
657 default:
658 break;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800659 }
Neil Brownb8da0d12007-09-05 17:22:13 -0400660 /* either a UUID type filehandle, or the filehandle doesn't
661 * match the export.
662 */
663 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
664 return FSIDSOURCE_FSID;
665 if (fhp->fh_export->ex_uuid)
666 return FSIDSOURCE_UUID;
667 return FSIDSOURCE_DEV;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800668}