blob: 78d8ebf162caeb1cbf3b85f028b0375f4ee2c626 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070030/*
31 * our acceptability function.
32 * if NOSUBTREECHECK, accept anything
33 * if not, require that we can walk up to exp->ex_dentry
34 * doing some checks on the 'x' bits
35 */
36static int nfsd_acceptable(void *expv, struct dentry *dentry)
37{
38 struct svc_export *exp = expv;
39 int rv;
40 struct dentry *tdentry;
41 struct dentry *parent;
42
43 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
44 return 1;
45
46 tdentry = dget(dentry);
Jan Blunck54775492008-02-14 19:38:39 -080047 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 /* make sure parents give x permission to user */
49 int err;
50 parent = dget_parent(tdentry);
Al Virof419a2e2008-07-22 00:07:17 -040051 err = inode_permission(parent->d_inode, MAY_EXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 if (err < 0) {
53 dput(parent);
54 break;
55 }
56 dput(tdentry);
57 tdentry = parent;
58 }
Jan Blunck54775492008-02-14 19:38:39 -080059 if (tdentry != exp->ex_path.dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
Jan Blunck54775492008-02-14 19:38:39 -080061 rv = (tdentry == exp->ex_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 dput(tdentry);
63 return rv;
64}
65
66/* Type check. The correct error return for type mismatches does not seem to be
67 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
68 * comment in the NFSv3 spec says this is incorrect (implementation notes for
69 * the write call).
70 */
Al Viro83b11342006-10-19 23:28:55 -070071static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070072nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
73{
74 /* Type can be negative when creating hardlinks - not to a dir */
75 if (type > 0 && (mode & S_IFMT) != type) {
76 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
77 return nfserr_symlink;
78 else if (type == S_IFDIR)
79 return nfserr_notdir;
80 else if ((mode & S_IFMT) == S_IFDIR)
81 return nfserr_isdir;
82 else
83 return nfserr_inval;
84 }
85 if (type < 0 && (mode & S_IFMT) == -type) {
86 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
87 return nfserr_symlink;
88 else if (type == -S_IFDIR)
89 return nfserr_isdir;
90 else
91 return nfserr_notdir;
92 }
93 return 0;
94}
95
J. Bruce Fields6fa02832007-11-12 16:05:03 -050096static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
97 struct svc_export *exp)
98{
99 /* Check if the request originated from a secure port. */
100 if (!rqstp->rq_secure && EX_SECURE(exp)) {
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300101 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500102 dprintk(KERN_WARNING
103 "nfsd: request from insecure port %s!\n",
104 svc_print_addr(rqstp, buf, sizeof(buf)));
105 return nfserr_perm;
106 }
107
108 /* Set user creds for this exportpoint */
109 return nfserrno(nfsd_setuser(rqstp, exp));
110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400113 * Use the given filehandle to look up the corresponding export and
114 * dentry. On success, the results are used to set fh_export and
115 * fh_dentry.
116 */
117static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
118{
119 struct knfsd_fh *fh = &fhp->fh_handle;
120 struct fid *fid = NULL, sfid;
121 struct svc_export *exp;
122 struct dentry *dentry;
123 int fileid_type;
124 int data_left = fh->fh_size/4;
125 __be32 error;
126
127 error = nfserr_stale;
128 if (rqstp->rq_vers > 2)
129 error = nfserr_badhandle;
130 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
131 return nfserr_nofilehandle;
132
133 if (fh->fh_version == 1) {
134 int len;
135
136 if (--data_left < 0)
137 return error;
138 if (fh->fh_auth_type != 0)
139 return error;
140 len = key_len(fh->fh_fsid_type) / 4;
141 if (len == 0)
142 return error;
143 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
144 /* deprecated, convert to type 3 */
145 len = key_len(FSID_ENCODE_DEV)/4;
146 fh->fh_fsid_type = FSID_ENCODE_DEV;
147 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
148 fh->fh_fsid[1] = fh->fh_fsid[2];
149 }
150 data_left -= len;
151 if (data_left < 0)
152 return error;
153 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
154 fid = (struct fid *)(fh->fh_auth + len);
155 } else {
156 __u32 tfh[2];
157 dev_t xdev;
158 ino_t xino;
159
160 if (fh->fh_size != NFS_FHSIZE)
161 return error;
162 /* assume old filehandle format */
163 xdev = old_decode_dev(fh->ofh_xdev);
164 xino = u32_to_ino_t(fh->ofh_xino);
165 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
166 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
167 }
168
169 error = nfserr_stale;
170 if (PTR_ERR(exp) == -ENOENT)
171 return error;
172
173 if (IS_ERR(exp))
174 return nfserrno(PTR_ERR(exp));
175
Neil Brown496d6c32008-05-08 13:03:09 +1000176 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
177 /* Elevate privileges so that the lack of 'r' or 'x'
178 * permission on some parent directory will
179 * not stop exportfs_decode_fh from being able
180 * to reconnect a directory into the dentry cache.
181 * The same problem can affect "SUBTREECHECK" exports,
182 * but as nfsd_acceptable depends on correct
183 * access control settings being in effect, we cannot
184 * fix that case easily.
185 */
David Howellsd84f4f92008-11-14 10:39:23 +1100186 struct cred *new = prepare_creds();
187 if (!new)
188 return nfserrno(-ENOMEM);
189 new->cap_effective =
190 cap_raise_nfsd_set(new->cap_effective,
191 new->cap_permitted);
192 put_cred(override_creds(new));
193 put_cred(new);
Neil Brown496d6c32008-05-08 13:03:09 +1000194 } else {
195 error = nfsd_setuser_and_check_port(rqstp, exp);
196 if (error)
197 goto out;
198 }
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400199
200 /*
201 * Look up the dentry using the NFS file handle.
202 */
203 error = nfserr_stale;
204 if (rqstp->rq_vers > 2)
205 error = nfserr_badhandle;
206
207 if (fh->fh_version != 1) {
208 sfid.i32.ino = fh->ofh_ino;
209 sfid.i32.gen = fh->ofh_generation;
210 sfid.i32.parent_ino = fh->ofh_dirino;
211 fid = &sfid;
212 data_left = 3;
213 if (fh->ofh_dirino == 0)
214 fileid_type = FILEID_INO32_GEN;
215 else
216 fileid_type = FILEID_INO32_GEN_PARENT;
217 } else
218 fileid_type = fh->fh_fileid_type;
219
220 if (fileid_type == FILEID_ROOT)
221 dentry = dget(exp->ex_path.dentry);
222 else {
223 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
224 data_left, fileid_type,
225 nfsd_acceptable, exp);
226 }
227 if (dentry == NULL)
228 goto out;
229 if (IS_ERR(dentry)) {
230 if (PTR_ERR(dentry) != -EINVAL)
231 error = nfserrno(PTR_ERR(dentry));
232 goto out;
233 }
234
Neil Brown496d6c32008-05-08 13:03:09 +1000235 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
236 error = nfsd_setuser_and_check_port(rqstp, exp);
237 if (error) {
238 dput(dentry);
239 goto out;
240 }
241 }
242
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400243 if (S_ISDIR(dentry->d_inode->i_mode) &&
244 (dentry->d_flags & DCACHE_DISCONNECTED)) {
245 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
246 dentry->d_parent->d_name.name, dentry->d_name.name);
247 }
248
249 fhp->fh_dentry = dentry;
250 fhp->fh_export = exp;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400251 return 0;
252out:
253 exp_put(exp);
254 return error;
255}
256
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400257/**
258 * fh_verify - filehandle lookup and access checking
259 * @rqstp: pointer to current rpc request
260 * @fhp: filehandle to be verified
261 * @type: expected type of object pointed to by filehandle
262 * @access: type of access needed to object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400264 * Look up a dentry from the on-the-wire filehandle, check the client's
265 * access to the export, and set the current task's credentials.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 *
J. Bruce Fieldsb3d476762008-10-20 13:01:59 -0400267 * Regardless of success or failure of fh_verify(), fh_put() should be
268 * called on @fhp when the caller is finished with the filehandle.
269 *
270 * fh_verify() may be called multiple times on a given filehandle, for
271 * example, when processing an NFSv4 compound. The first call will look
272 * up a dentry using the on-the-wire filehandle. Subsequent calls will
273 * skip the lookup and just perform the other checks and possibly change
274 * the current task's credentials.
275 *
276 * @type specifies the type of object expected using one of the S_IF*
277 * constants defined in include/linux/stat.h. The caller may use zero
278 * to indicate that it doesn't care, or a negative integer to indicate
279 * that it expects something not of the given type.
280 *
281 * @access is formed from the NFSD_MAY_* constants defined in
282 * include/linux/nfsd/nfsd.h.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 */
Al Viro83b11342006-10-19 23:28:55 -0700284__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
286{
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400287 struct svc_export *exp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 struct dentry *dentry;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400289 __be32 error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (!fhp->fh_dentry) {
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400294 error = nfsd_set_fh_dentry(rqstp, fhp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700295 if (error)
296 goto out;
J. Bruce Fields03550fa2008-03-14 17:51:12 -0400297 dentry = fhp->fh_dentry;
298 exp = fhp->fh_export;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 } else {
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500300 /*
301 * just rechecking permissions
302 * (e.g. nfsproc_create calls fh_verify, then nfsd_create
303 * does as well)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 */
305 dprintk("nfsd: fh_verify - just checking\n");
306 dentry = fhp->fh_dentry;
307 exp = fhp->fh_export;
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500308 /*
309 * Set user creds for this exportpoint; necessary even
NeilBrownd1bbf142006-07-30 03:03:16 -0700310 * in the "just checking" case because this may be a
311 * filehandle that was created by fh_compose, and that
312 * is about to be used in another nfsv4 compound
J. Bruce Fields6fa02832007-11-12 16:05:03 -0500313 * operation.
314 */
315 error = nfsd_setuser_and_check_port(rqstp, exp);
NeilBrownd1bbf142006-07-30 03:03:16 -0700316 if (error)
317 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 }
J. Bruce Fields7fc90ec2006-06-30 01:56:14 -0700319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
321 if (error)
322 goto out;
323
J. Bruce Fields04716e62008-08-07 13:00:20 -0400324 /*
325 * pseudoflavor restrictions are not enforced on NLM,
326 * which clients virtually always use auth_sys for,
327 * even while using RPCSEC_GSS for NFS.
328 */
329 if (access & NFSD_MAY_LOCK)
330 goto skip_pseudoflavor_check;
331 /*
332 * Clients may expect to be able to use auth_sys during mount,
333 * even if they use gss for everything else; see section 2.3.2
334 * of rfc 2623.
335 */
336 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
337 && exp->ex_path.dentry == dentry)
338 goto skip_pseudoflavor_check;
Andy Adamson32c1eb02007-07-17 04:04:48 -0700339
J. Bruce Fields04716e62008-08-07 13:00:20 -0400340 error = check_nfsd_access(exp, rqstp);
341 if (error)
342 goto out;
343
344skip_pseudoflavor_check:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 /* Finally, check access permissions. */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700346 error = nfsd_permission(rqstp, exp, dentry, access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 if (error) {
NeilBrown34e9a632007-01-29 13:19:52 -0800349 dprintk("fh_verify: %s/%s permission failure, "
350 "acc=%x, error=%d\n",
351 dentry->d_parent->d_name.name,
352 dentry->d_name.name,
Al Virofc2dd2e2007-02-01 13:52:43 +0000353 access, ntohl(error));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (error == nfserr_stale)
357 nfsdstats.fh_stale++;
358 return error;
359}
360
361
362/*
363 * Compose a file handle for an NFS reply.
364 *
365 * Note that when first composed, the dentry may not yet have
366 * an inode. In this case a call to fh_update should be made
367 * before the fh goes out on the wire ...
368 */
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700369static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
370 struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Jan Blunck54775492008-02-14 19:38:39 -0800372 if (dentry != exp->ex_path.dentry) {
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700373 struct fid *fid = (struct fid *)
374 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
375 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
376 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700378 fhp->fh_handle.fh_fileid_type =
379 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
380 fhp->fh_handle.fh_size += maxsize * 4;
381 } else {
382 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384}
385
386/*
387 * for composing old style file handles
388 */
389static inline void _fh_update_old(struct dentry *dentry,
390 struct svc_export *exp,
391 struct knfsd_fh *fh)
392{
393 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
394 fh->ofh_generation = dentry->d_inode->i_generation;
395 if (S_ISDIR(dentry->d_inode->i_mode) ||
396 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
397 fh->ofh_dirino = 0;
398}
399
J. Bruce Fields8e498752009-09-02 19:31:32 -0400400static bool is_root_export(struct svc_export *exp)
401{
402 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
403}
404
405static struct super_block *exp_sb(struct svc_export *exp)
406{
407 return exp->ex_path.dentry->d_inode->i_sb;
408}
409
410static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
411{
412 switch (fsid_type) {
413 case FSID_DEV:
414 if (!old_valid_dev(exp_sb(exp)->s_dev))
415 return 0;
416 /* FALL THROUGH */
417 case FSID_MAJOR_MINOR:
418 case FSID_ENCODE_DEV:
419 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
420 case FSID_NUM:
421 return exp->ex_flags & NFSEXP_FSID;
422 case FSID_UUID8:
423 case FSID_UUID16:
424 if (!is_root_export(exp))
425 return 0;
426 /* fall through */
427 case FSID_UUID4_INUM:
428 case FSID_UUID16_INUM:
429 return exp->ex_uuid != NULL;
430 }
431 return 1;
432}
433
Al Viro83b11342006-10-19 23:28:55 -0700434__be32
NeilBrown982aedf2007-02-14 00:33:11 -0800435fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
436 struct svc_fh *ref_fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
438 /* ref_fh is a reference file handle.
NeilBrown7e405362006-06-30 01:56:12 -0700439 * if it is non-null and for the same filesystem, then we should compose
440 * a filehandle which is of the same version, where possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
442 * Then create a 32byte filehandle using nfs_fhbase_old
443 *
444 */
445
NeilBrownb41eeef2007-05-09 02:34:57 -0700446 u8 version;
NeilBrown982aedf2007-02-14 00:33:11 -0800447 u8 fsid_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct inode * inode = dentry->d_inode;
449 struct dentry *parent = dentry->d_parent;
450 __u32 *datap;
J. Bruce Fields8e498752009-09-02 19:31:32 -0400451 dev_t ex_dev = exp_sb(exp)->s_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
454 MAJOR(ex_dev), MINOR(ex_dev),
Jan Blunck54775492008-02-14 19:38:39 -0800455 (long) exp->ex_path.dentry->d_inode->i_ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 parent->d_name.name, dentry->d_name.name,
457 (inode ? inode->i_ino : 0));
458
NeilBrown982aedf2007-02-14 00:33:11 -0800459 /* Choose filehandle version and fsid type based on
460 * the reference filehandle (if it is in the same export)
461 * or the export options.
462 */
NeilBrownb41eeef2007-05-09 02:34:57 -0700463 retry:
464 version = 1;
NeilBrown7e405362006-06-30 01:56:12 -0700465 if (ref_fh && ref_fh->fh_export == exp) {
NeilBrown982aedf2007-02-14 00:33:11 -0800466 version = ref_fh->fh_handle.fh_version;
NeilBrownb41eeef2007-05-09 02:34:57 -0700467 fsid_type = ref_fh->fh_handle.fh_fsid_type;
468
469 if (ref_fh == fhp)
470 fh_put(ref_fh);
471 ref_fh = NULL;
472
473 switch (version) {
474 case 0xca:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800475 fsid_type = FSID_DEV;
NeilBrownb41eeef2007-05-09 02:34:57 -0700476 break;
477 case 1:
478 break;
479 default:
480 goto retry;
481 }
482
J. Bruce Fields8e498752009-09-02 19:31:32 -0400483 /*
484 * As the fsid -> filesystem mapping was guided by
485 * user-space, there is no guarantee that the filesystem
486 * actually supports that fsid type. If it doesn't we
487 * loop around again without ref_fh set.
NeilBrown982aedf2007-02-14 00:33:11 -0800488 */
J. Bruce Fields8e498752009-09-02 19:31:32 -0400489 if (!fsid_type_ok_for_exp(fsid_type, exp))
490 goto retry;
Steve Dickson30fa8c02009-01-07 16:54:30 -0500491 } else if (exp->ex_flags & NFSEXP_FSID) {
492 fsid_type = FSID_NUM;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800493 } else if (exp->ex_uuid) {
494 if (fhp->fh_maxsize >= 64) {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400495 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800496 fsid_type = FSID_UUID16;
497 else
498 fsid_type = FSID_UUID16_INUM;
499 } else {
J. Bruce Fields8e498752009-09-02 19:31:32 -0400500 if (is_root_export(exp))
NeilBrownaf6a4e22007-02-14 00:33:12 -0800501 fsid_type = FSID_UUID8;
502 else
503 fsid_type = FSID_UUID4_INUM;
504 }
Steve Dickson30fa8c02009-01-07 16:54:30 -0500505 } else if (!old_valid_dev(ex_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 /* for newer device numbers, we must use a newer fsid format */
NeilBrownaf6a4e22007-02-14 00:33:12 -0800507 fsid_type = FSID_ENCODE_DEV;
NeilBrown982aedf2007-02-14 00:33:11 -0800508 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800509 fsid_type = FSID_DEV;
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
NeilBrown982aedf2007-02-14 00:33:11 -0800527 if (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;
541 fhp->fh_handle.fh_version = 1;
542 fhp->fh_handle.fh_auth_type = 0;
543 datap = fhp->fh_handle.fh_auth+0;
NeilBrown982aedf2007-02-14 00:33:11 -0800544 fhp->fh_handle.fh_fsid_type = fsid_type;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800545 mk_fsid(fsid_type, datap, ex_dev,
Jan Blunck54775492008-02-14 19:38:39 -0800546 exp->ex_path.dentry->d_inode->i_ino,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800547 exp->ex_fsid, exp->ex_uuid);
548
NeilBrown982aedf2007-02-14 00:33:11 -0800549 len = key_len(fsid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 datap += len/4;
551 fhp->fh_handle.fh_size = 4 + len;
552
Christoph Hellwig6e91ea22007-10-21 16:42:03 -0700553 if (inode)
554 _fh_update(fhp, exp, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (fhp->fh_handle.fh_fileid_type == 255)
556 return nfserr_opnotsupp;
557 }
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}