blob: 245eaa1fb59b2959cac3ebfb1a8a9d35c065a324 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#define MSNFS /* HACK HACK */
2/*
3 * linux/fs/nfsd/vfs.c
4 *
5 * File operations used by nfsd. Some of these have been ripped from
6 * other parts of the kernel because they weren't exported, others
7 * are partial duplicates with added or changed functionality.
8 *
9 * Note that several functions dget() the dentry upon which they want
10 * to act, most notably those that create directory entries. Response
11 * dentry's are dput()'d if necessary in the release callback.
12 * So if you notice code paths that apparently fail to dput() the
13 * dentry, don't worry--they have been taken care of.
14 *
15 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
16 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
17 */
18
19#include <linux/config.h>
20#include <linux/string.h>
21#include <linux/time.h>
22#include <linux/errno.h>
23#include <linux/fs.h>
24#include <linux/file.h>
25#include <linux/mount.h>
26#include <linux/major.h>
27#include <linux/ext2_fs.h>
28#include <linux/proc_fs.h>
29#include <linux/stat.h>
30#include <linux/fcntl.h>
31#include <linux/net.h>
32#include <linux/unistd.h>
33#include <linux/slab.h>
34#include <linux/pagemap.h>
35#include <linux/in.h>
36#include <linux/module.h>
37#include <linux/namei.h>
38#include <linux/vfs.h>
39#include <linux/delay.h>
40#include <linux/sunrpc/svc.h>
41#include <linux/nfsd/nfsd.h>
42#ifdef CONFIG_NFSD_V3
43#include <linux/nfs3.h>
44#include <linux/nfsd/xdr3.h>
45#endif /* CONFIG_NFSD_V3 */
46#include <linux/nfsd/nfsfh.h>
47#include <linux/quotaops.h>
Robert Love0eeca282005-07-12 17:06:03 -040048#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/posix_acl.h>
50#include <linux/posix_acl_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/xattr.h>
Christoph Hellwig5be196e2006-01-09 20:51:55 -080052#ifdef CONFIG_NFSD_V4
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/nfs4.h>
54#include <linux/nfs4_acl.h>
55#include <linux/nfsd_idmap.h>
56#include <linux/security.h>
57#endif /* CONFIG_NFSD_V4 */
58
59#include <asm/uaccess.h>
60
61#define NFSDDBG_FACILITY NFSDDBG_FILEOP
62#define NFSD_PARANOIA
63
64
65/* We must ignore files (but only files) which might have mandatory
66 * locks on them because there is no way to know if the accesser has
67 * the lock.
68 */
69#define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
70
71/*
72 * This is a cache of readahead params that help us choose the proper
73 * readahead strategy. Initially, we set all readahead parameters to 0
74 * and let the VFS handle things.
75 * If you increase the number of cached files very much, you'll need to
76 * add a hash table here.
77 */
78struct raparms {
79 struct raparms *p_next;
80 unsigned int p_count;
81 ino_t p_ino;
82 dev_t p_dev;
83 int p_set;
84 struct file_ra_state p_ra;
85};
86
87static struct raparms * raparml;
88static struct raparms * raparm_cache;
89
90/*
91 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
92 * a mount point.
93 * Returns -EAGAIN leaving *dpp and *expp unchanged,
94 * or nfs_ok having possibly changed *dpp and *expp
95 */
96int
97nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
98 struct svc_export **expp)
99{
100 struct svc_export *exp = *expp, *exp2 = NULL;
101 struct dentry *dentry = *dpp;
102 struct vfsmount *mnt = mntget(exp->ex_mnt);
103 struct dentry *mounts = dget(dentry);
104 int err = nfs_ok;
105
106 while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
107
108 exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
109 if (IS_ERR(exp2)) {
110 err = PTR_ERR(exp2);
111 dput(mounts);
112 mntput(mnt);
113 goto out;
114 }
115 if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
116 /* successfully crossed mount point */
117 exp_put(exp);
118 *expp = exp2;
119 dput(dentry);
120 *dpp = mounts;
121 } else {
122 if (exp2) exp_put(exp2);
123 dput(mounts);
124 }
125 mntput(mnt);
126out:
127 return err;
128}
129
130/*
131 * Look up one component of a pathname.
132 * N.B. After this call _both_ fhp and resfh need an fh_put
133 *
134 * If the lookup would cross a mountpoint, and the mounted filesystem
135 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
136 * accepted as it stands and the mounted directory is
137 * returned. Otherwise the covered directory is returned.
138 * NOTE: this mountpoint crossing is not supported properly by all
139 * clients and is explicitly disallowed for NFSv3
140 * NeilBrown <neilb@cse.unsw.edu.au>
141 */
142int
143nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
144 int len, struct svc_fh *resfh)
145{
146 struct svc_export *exp;
147 struct dentry *dparent;
148 struct dentry *dentry;
149 int err;
150
151 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
152
153 /* Obtain dentry and export. */
154 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
155 if (err)
156 return err;
157
158 dparent = fhp->fh_dentry;
159 exp = fhp->fh_export;
160 exp_get(exp);
161
162 err = nfserr_acces;
163
164 /* Lookup the name, but don't follow links */
165 if (isdotent(name, len)) {
166 if (len==1)
167 dentry = dget(dparent);
168 else if (dparent != exp->ex_dentry) {
169 dentry = dget_parent(dparent);
170 } else if (!EX_NOHIDE(exp))
171 dentry = dget(dparent); /* .. == . just like at / */
172 else {
173 /* checking mountpoint crossing is very different when stepping up */
174 struct svc_export *exp2 = NULL;
175 struct dentry *dp;
176 struct vfsmount *mnt = mntget(exp->ex_mnt);
177 dentry = dget(dparent);
178 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
179 ;
180 dp = dget_parent(dentry);
181 dput(dentry);
182 dentry = dp;
183
184 exp2 = exp_parent(exp->ex_client, mnt, dentry,
185 &rqstp->rq_chandle);
186 if (IS_ERR(exp2)) {
187 err = PTR_ERR(exp2);
188 dput(dentry);
189 mntput(mnt);
190 goto out_nfserr;
191 }
192 if (!exp2) {
193 dput(dentry);
194 dentry = dget(dparent);
195 } else {
196 exp_put(exp);
197 exp = exp2;
198 }
199 mntput(mnt);
200 }
201 } else {
202 fh_lock(fhp);
203 dentry = lookup_one_len(name, dparent, len);
204 err = PTR_ERR(dentry);
205 if (IS_ERR(dentry))
206 goto out_nfserr;
207 /*
208 * check if we have crossed a mount point ...
209 */
210 if (d_mountpoint(dentry)) {
211 if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
212 dput(dentry);
213 goto out_nfserr;
214 }
215 }
216 }
217 /*
218 * Note: we compose the file handle now, but as the
219 * dentry may be negative, it may need to be updated.
220 */
221 err = fh_compose(resfh, exp, dentry, fhp);
222 if (!err && !dentry->d_inode)
223 err = nfserr_noent;
224 dput(dentry);
225out:
226 exp_put(exp);
227 return err;
228
229out_nfserr:
230 err = nfserrno(err);
231 goto out;
232}
233
234/*
235 * Set various file attributes.
236 * N.B. After this call fhp needs an fh_put
237 */
238int
239nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
240 int check_guard, time_t guardtime)
241{
242 struct dentry *dentry;
243 struct inode *inode;
244 int accmode = MAY_SATTR;
245 int ftype = 0;
246 int imode;
247 int err;
248 int size_change = 0;
249
250 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
251 accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
252 if (iap->ia_valid & ATTR_SIZE)
253 ftype = S_IFREG;
254
255 /* Get inode */
256 err = fh_verify(rqstp, fhp, ftype, accmode);
NeilBrown15b7a1b2005-11-07 01:00:23 -0800257 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 goto out;
259
260 dentry = fhp->fh_dentry;
261 inode = dentry->d_inode;
262
NeilBrown15b7a1b2005-11-07 01:00:23 -0800263 /* Ignore any mode updates on symlinks */
264 if (S_ISLNK(inode->i_mode))
265 iap->ia_valid &= ~ATTR_MODE;
266
267 if (!iap->ia_valid)
268 goto out;
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
271 * which only requires access, and "set-[ac]time-to-X" which
272 * requires ownership.
273 * So if it looks like it might be "set both to the same time which
274 * is close to now", and if inode_change_ok fails, then we
275 * convert to "set to now" instead of "set to explicit time"
276 *
277 * We only call inode_change_ok as the last test as technically
278 * it is not an interface that we should be using. It is only
279 * valid if the filesystem does not define it's own i_op->setattr.
280 */
281#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
282#define MAX_TOUCH_TIME_ERROR (30*60)
283 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
284 && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
285 ) {
286 /* Looks probable. Now just make sure time is in the right ballpark.
287 * Solaris, at least, doesn't seem to care what the time request is.
288 * We require it be within 30 minutes of now.
289 */
290 time_t delta = iap->ia_atime.tv_sec - get_seconds();
291 if (delta<0) delta = -delta;
292 if (delta < MAX_TOUCH_TIME_ERROR &&
293 inode_change_ok(inode, iap) != 0) {
294 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
295 * this will cause notify_change to set these times to "now"
296 */
297 iap->ia_valid &= ~BOTH_TIME_SET;
298 }
299 }
300
301 /* The size case is special. It changes the file as well as the attributes. */
302 if (iap->ia_valid & ATTR_SIZE) {
303 if (iap->ia_size < inode->i_size) {
304 err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
305 if (err)
306 goto out;
307 }
308
309 /*
310 * If we are changing the size of the file, then
311 * we need to break all leases.
312 */
313 err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
314 if (err == -EWOULDBLOCK)
315 err = -ETIMEDOUT;
316 if (err) /* ENOMEM or EWOULDBLOCK */
317 goto out_nfserr;
318
319 err = get_write_access(inode);
320 if (err)
321 goto out_nfserr;
322
323 size_change = 1;
324 err = locks_verify_truncate(inode, NULL, iap->ia_size);
325 if (err) {
326 put_write_access(inode);
327 goto out_nfserr;
328 }
329 DQUOT_INIT(inode);
330 }
331
332 imode = inode->i_mode;
333 if (iap->ia_valid & ATTR_MODE) {
334 iap->ia_mode &= S_IALLUGO;
335 imode = iap->ia_mode |= (imode & ~S_IALLUGO);
336 }
337
338 /* Revoke setuid/setgid bit on chown/chgrp */
339 if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
340 iap->ia_valid |= ATTR_KILL_SUID;
341 if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
342 iap->ia_valid |= ATTR_KILL_SGID;
343
344 /* Change the attributes. */
345
346 iap->ia_valid |= ATTR_CTIME;
347
348 err = nfserr_notsync;
349 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
350 fh_lock(fhp);
351 err = notify_change(dentry, iap);
352 err = nfserrno(err);
353 fh_unlock(fhp);
354 }
355 if (size_change)
356 put_write_access(inode);
357 if (!err)
358 if (EX_ISSYNC(fhp->fh_export))
359 write_inode_now(inode, 1);
360out:
361 return err;
362
363out_nfserr:
364 err = nfserrno(err);
365 goto out;
366}
367
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800368#if defined(CONFIG_NFSD_V2_ACL) || \
369 defined(CONFIG_NFSD_V3_ACL) || \
370 defined(CONFIG_NFSD_V4)
371static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
372{
373 ssize_t buflen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800375 buflen = vfs_getxattr(dentry, key, NULL, 0);
376 if (buflen <= 0)
377 return buflen;
378
379 *buf = kmalloc(buflen, GFP_KERNEL);
380 if (!*buf)
381 return -ENOMEM;
382
NeilBrownb5872b02006-04-10 22:55:26 -0700383 return vfs_getxattr(dentry, key, *buf, buflen);
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800384}
385#endif
386
387#if defined(CONFIG_NFSD_V4)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388static int
389set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
390{
391 int len;
392 size_t buflen;
393 char *buf = NULL;
394 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 buflen = posix_acl_xattr_size(pacl->a_count);
397 buf = kmalloc(buflen, GFP_KERNEL);
398 error = -ENOMEM;
399 if (buf == NULL)
400 goto out;
401
402 len = posix_acl_to_xattr(pacl, buf, buflen);
403 if (len < 0) {
404 error = len;
405 goto out;
406 }
407
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800408 error = vfs_setxattr(dentry, key, buf, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409out:
410 kfree(buf);
411 return error;
412}
413
414int
415nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
416 struct nfs4_acl *acl)
417{
418 int error;
419 struct dentry *dentry;
420 struct inode *inode;
421 struct posix_acl *pacl = NULL, *dpacl = NULL;
422 unsigned int flags = 0;
423
424 /* Get inode */
425 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
426 if (error)
427 goto out;
428
429 dentry = fhp->fh_dentry;
430 inode = dentry->d_inode;
431 if (S_ISDIR(inode->i_mode))
432 flags = NFS4_ACL_DIR;
433
434 error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
435 if (error == -EINVAL) {
436 error = nfserr_attrnotsupp;
437 goto out;
438 } else if (error < 0)
439 goto out_nfserr;
440
441 if (pacl) {
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700442 error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 if (error < 0)
444 goto out_nfserr;
445 }
446
447 if (dpacl) {
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700448 error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (error < 0)
450 goto out_nfserr;
451 }
452
453 error = nfs_ok;
454
455out:
456 posix_acl_release(pacl);
457 posix_acl_release(dpacl);
458 return (error);
459out_nfserr:
460 error = nfserrno(error);
461 goto out;
462}
463
464static struct posix_acl *
465_get_posix_acl(struct dentry *dentry, char *key)
466{
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800467 void *buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 struct posix_acl *pacl = NULL;
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800469 int buflen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Christoph Hellwig5be196e2006-01-09 20:51:55 -0800471 buflen = nfsd_getxattr(dentry, key, &buf);
472 if (!buflen)
473 buflen = -ENODATA;
474 if (buflen <= 0)
475 return ERR_PTR(buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477 pacl = posix_acl_from_xattr(buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 kfree(buf);
479 return pacl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
482int
483nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
484{
485 struct inode *inode = dentry->d_inode;
486 int error = 0;
487 struct posix_acl *pacl = NULL, *dpacl = NULL;
488 unsigned int flags = 0;
489
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700490 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
492 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
493 if (IS_ERR(pacl)) {
494 error = PTR_ERR(pacl);
495 pacl = NULL;
496 goto out;
497 }
498
499 if (S_ISDIR(inode->i_mode)) {
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700500 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
502 dpacl = NULL;
503 else if (IS_ERR(dpacl)) {
504 error = PTR_ERR(dpacl);
505 dpacl = NULL;
506 goto out;
507 }
508 flags = NFS4_ACL_DIR;
509 }
510
511 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
512 if (IS_ERR(*acl)) {
513 error = PTR_ERR(*acl);
514 *acl = NULL;
515 }
516 out:
517 posix_acl_release(pacl);
518 posix_acl_release(dpacl);
519 return error;
520}
521
522#endif /* defined(CONFIG_NFS_V4) */
523
524#ifdef CONFIG_NFSD_V3
525/*
526 * Check server access rights to a file system object
527 */
528struct accessmap {
529 u32 access;
530 int how;
531};
532static struct accessmap nfs3_regaccess[] = {
533 { NFS3_ACCESS_READ, MAY_READ },
534 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
535 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
536 { NFS3_ACCESS_EXTEND, MAY_WRITE },
537
538 { 0, 0 }
539};
540
541static struct accessmap nfs3_diraccess[] = {
542 { NFS3_ACCESS_READ, MAY_READ },
543 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
544 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
545 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
546 { NFS3_ACCESS_DELETE, MAY_REMOVE },
547
548 { 0, 0 }
549};
550
551static struct accessmap nfs3_anyaccess[] = {
552 /* Some clients - Solaris 2.6 at least, make an access call
553 * to the server to check for access for things like /dev/null
554 * (which really, the server doesn't care about). So
555 * We provide simple access checking for them, looking
556 * mainly at mode bits, and we make sure to ignore read-only
557 * filesystem checks
558 */
559 { NFS3_ACCESS_READ, MAY_READ },
560 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
561 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
562 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
563
564 { 0, 0 }
565};
566
567int
568nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
569{
570 struct accessmap *map;
571 struct svc_export *export;
572 struct dentry *dentry;
573 u32 query, result = 0, sresult = 0;
574 unsigned int error;
575
576 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
577 if (error)
578 goto out;
579
580 export = fhp->fh_export;
581 dentry = fhp->fh_dentry;
582
583 if (S_ISREG(dentry->d_inode->i_mode))
584 map = nfs3_regaccess;
585 else if (S_ISDIR(dentry->d_inode->i_mode))
586 map = nfs3_diraccess;
587 else
588 map = nfs3_anyaccess;
589
590
591 query = *access;
592 for (; map->access; map++) {
593 if (map->access & query) {
594 unsigned int err2;
595
596 sresult |= map->access;
597
598 err2 = nfsd_permission(export, dentry, map->how);
599 switch (err2) {
600 case nfs_ok:
601 result |= map->access;
602 break;
603
604 /* the following error codes just mean the access was not allowed,
605 * rather than an error occurred */
606 case nfserr_rofs:
607 case nfserr_acces:
608 case nfserr_perm:
609 /* simply don't "or" in the access bit. */
610 break;
611 default:
612 error = err2;
613 goto out;
614 }
615 }
616 }
617 *access = result;
618 if (supported)
619 *supported = sresult;
620
621 out:
622 return error;
623}
624#endif /* CONFIG_NFSD_V3 */
625
626
627
628/*
629 * Open an existing file or directory.
630 * The access argument indicates the type of open (read/write/lock)
631 * N.B. After this call fhp needs an fh_put
632 */
633int
634nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
635 int access, struct file **filp)
636{
637 struct dentry *dentry;
638 struct inode *inode;
639 int flags = O_RDONLY|O_LARGEFILE, err;
640
641 /*
642 * If we get here, then the client has already done an "open",
643 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
644 * in case a chmod has now revoked permission.
645 */
646 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
647 if (err)
648 goto out;
649
650 dentry = fhp->fh_dentry;
651 inode = dentry->d_inode;
652
653 /* Disallow write access to files with the append-only bit set
654 * or any access when mandatory locking enabled
655 */
656 err = nfserr_perm;
657 if (IS_APPEND(inode) && (access & MAY_WRITE))
658 goto out;
659 if (IS_ISMNDLK(inode))
660 goto out;
661
662 if (!inode->i_fop)
663 goto out;
664
665 /*
666 * Check to see if there are any leases on this file.
667 * This may block while leases are broken.
668 */
669 err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
670 if (err == -EWOULDBLOCK)
671 err = -ETIMEDOUT;
672 if (err) /* NOMEM or WOULDBLOCK */
673 goto out_nfserr;
674
675 if (access & MAY_WRITE) {
676 flags = O_WRONLY|O_LARGEFILE;
677
678 DQUOT_INIT(inode);
679 }
680 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
681 if (IS_ERR(*filp))
682 err = PTR_ERR(*filp);
683out_nfserr:
684 if (err)
685 err = nfserrno(err);
686out:
687 return err;
688}
689
690/*
691 * Close a file.
692 */
693void
694nfsd_close(struct file *filp)
695{
696 fput(filp);
697}
698
699/*
700 * Sync a file
701 * As this calls fsync (not fdatasync) there is no need for a write_inode
702 * after it.
703 */
David Shawa334de22006-01-06 00:19:58 -0800704static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800705 const struct file_operations *fop)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
707 struct inode *inode = dp->d_inode;
708 int (*fsync) (struct file *, struct dentry *, int);
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -0800709 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -0800711 err = filemap_fdatawrite(inode->i_mapping);
712 if (err == 0 && fop && (fsync = fop->fsync))
713 err = fsync(filp, dp, 0);
714 if (err == 0)
715 err = filemap_fdatawait(inode->i_mapping);
David Shawa334de22006-01-06 00:19:58 -0800716
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -0800717 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
719
720
David Shawa334de22006-01-06 00:19:58 -0800721static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722nfsd_sync(struct file *filp)
723{
David Shawa334de22006-01-06 00:19:58 -0800724 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 struct inode *inode = filp->f_dentry->d_inode;
726 dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800727 mutex_lock(&inode->i_mutex);
David Shawa334de22006-01-06 00:19:58 -0800728 err=nfsd_dosync(filp, filp->f_dentry, filp->f_op);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800729 mutex_unlock(&inode->i_mutex);
David Shawa334de22006-01-06 00:19:58 -0800730
731 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -0800734int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735nfsd_sync_dir(struct dentry *dp)
736{
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -0800737 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
740/*
741 * Obtain the readahead parameters for the file
742 * specified by (dev, ino).
743 */
744static DEFINE_SPINLOCK(ra_lock);
745
746static inline struct raparms *
747nfsd_get_raparms(dev_t dev, ino_t ino)
748{
749 struct raparms *ra, **rap, **frap = NULL;
750 int depth = 0;
751
752 spin_lock(&ra_lock);
753 for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) {
754 if (ra->p_ino == ino && ra->p_dev == dev)
755 goto found;
756 depth++;
757 if (ra->p_count == 0)
758 frap = rap;
759 }
760 depth = nfsdstats.ra_size*11/10;
761 if (!frap) {
762 spin_unlock(&ra_lock);
763 return NULL;
764 }
765 rap = frap;
766 ra = *frap;
767 ra->p_dev = dev;
768 ra->p_ino = ino;
769 ra->p_set = 0;
770found:
771 if (rap != &raparm_cache) {
772 *rap = ra->p_next;
773 ra->p_next = raparm_cache;
774 raparm_cache = ra;
775 }
776 ra->p_count++;
777 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
778 spin_unlock(&ra_lock);
779 return ra;
780}
781
782/*
783 * Grab and keep cached pages assosiated with a file in the svc_rqst
784 * so that they can be passed to the netowork sendmsg/sendpage routines
785 * directrly. They will be released after the sending has completed.
786 */
787static int
788nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
789{
790 unsigned long count = desc->count;
791 struct svc_rqst *rqstp = desc->arg.data;
792
793 if (size > count)
794 size = count;
795
796 if (rqstp->rq_res.page_len == 0) {
797 get_page(page);
798 rqstp->rq_respages[rqstp->rq_resused++] = page;
799 rqstp->rq_res.page_base = offset;
800 rqstp->rq_res.page_len = size;
801 } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) {
802 get_page(page);
803 rqstp->rq_respages[rqstp->rq_resused++] = page;
804 rqstp->rq_res.page_len += size;
805 } else {
806 rqstp->rq_res.page_len += size;
807 }
808
809 desc->count = count - size;
810 desc->written += size;
811 return size;
812}
813
NeilBrown7e8f0592006-01-18 17:43:14 -0800814static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
816 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
817{
818 struct inode *inode;
819 struct raparms *ra;
820 mm_segment_t oldfs;
821 int err;
822
823 err = nfserr_perm;
824 inode = file->f_dentry->d_inode;
825#ifdef MSNFS
826 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
827 (!lock_may_read(inode, offset, *count)))
828 goto out;
829#endif
830
831 /* Get readahead parameters */
832 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
833
834 if (ra && ra->p_set)
835 file->f_ra = ra->p_ra;
836
837 if (file->f_op->sendfile) {
838 svc_pushback_unused_pages(rqstp);
839 err = file->f_op->sendfile(file, &offset, *count,
840 nfsd_read_actor, rqstp);
841 } else {
842 oldfs = get_fs();
843 set_fs(KERNEL_DS);
844 err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
845 set_fs(oldfs);
846 }
847
848 /* Write back readahead params */
849 if (ra) {
850 spin_lock(&ra_lock);
851 ra->p_ra = file->f_ra;
852 ra->p_set = 1;
853 ra->p_count--;
854 spin_unlock(&ra_lock);
855 }
856
857 if (err >= 0) {
858 nfsdstats.io_read += err;
859 *count = err;
860 err = 0;
Robert Love0eeca282005-07-12 17:06:03 -0400861 fsnotify_access(file->f_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 } else
863 err = nfserrno(err);
864out:
865 return err;
866}
867
Neil Brown9f708e42006-01-06 00:19:59 -0800868static void kill_suid(struct dentry *dentry)
869{
870 struct iattr ia;
871 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
872
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800873 mutex_lock(&dentry->d_inode->i_mutex);
Neil Brown9f708e42006-01-06 00:19:59 -0800874 notify_change(dentry, &ia);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800875 mutex_unlock(&dentry->d_inode->i_mutex);
Neil Brown9f708e42006-01-06 00:19:59 -0800876}
877
NeilBrown7e8f0592006-01-18 17:43:14 -0800878static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
880 loff_t offset, struct kvec *vec, int vlen,
881 unsigned long cnt, int *stablep)
882{
883 struct svc_export *exp;
884 struct dentry *dentry;
885 struct inode *inode;
886 mm_segment_t oldfs;
887 int err = 0;
888 int stable = *stablep;
889
NeilBrown45bd3b32006-01-18 17:43:50 -0800890#ifdef MSNFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 err = nfserr_perm;
892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
894 (!lock_may_write(file->f_dentry->d_inode, offset, cnt)))
895 goto out;
896#endif
897
898 dentry = file->f_dentry;
899 inode = dentry->d_inode;
900 exp = fhp->fh_export;
901
902 /*
903 * Request sync writes if
904 * - the sync export option has been set, or
905 * - the client requested O_SYNC behavior (NFSv3 feature).
906 * - The file system doesn't support fsync().
907 * When gathered writes have been configured for this volume,
908 * flushing the data to disk is handled separately below.
909 */
910
911 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
912 stable = 2;
913 *stablep = 2; /* FILE_SYNC */
914 }
915
916 if (!EX_ISSYNC(exp))
917 stable = 0;
918 if (stable && !EX_WGATHER(exp))
919 file->f_flags |= O_SYNC;
920
921 /* Write the data. */
922 oldfs = get_fs(); set_fs(KERNEL_DS);
923 err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
924 set_fs(oldfs);
925 if (err >= 0) {
926 nfsdstats.io_write += cnt;
Robert Love0eeca282005-07-12 17:06:03 -0400927 fsnotify_modify(file->f_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 }
929
930 /* clear setuid/setgid flag after write */
Neil Brown9f708e42006-01-06 00:19:59 -0800931 if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
932 kill_suid(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 if (err >= 0 && stable) {
935 static ino_t last_ino;
936 static dev_t last_dev;
937
938 /*
939 * Gathered writes: If another process is currently
940 * writing to the file, there's a high chance
941 * this is another nfsd (triggered by a bulk write
942 * from a client's biod). Rather than syncing the
943 * file with each write request, we sleep for 10 msec.
944 *
945 * I don't know if this roughly approximates
946 * C. Juszak's idea of gathered writes, but it's a
947 * nice and simple solution (IMHO), and it seems to
948 * work:-)
949 */
950 if (EX_WGATHER(exp)) {
951 if (atomic_read(&inode->i_writecount) > 1
952 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
953 dprintk("nfsd: write defer %d\n", current->pid);
954 msleep(10);
955 dprintk("nfsd: write resume %d\n", current->pid);
956 }
957
958 if (inode->i_state & I_DIRTY) {
959 dprintk("nfsd: write sync %d\n", current->pid);
David Shawa334de22006-01-06 00:19:58 -0800960 err=nfsd_sync(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 }
962#if 0
963 wake_up(&inode->i_wait);
964#endif
965 }
966 last_ino = inode->i_ino;
967 last_dev = inode->i_sb->s_dev;
968 }
969
970 dprintk("nfsd: write complete err=%d\n", err);
971 if (err >= 0)
972 err = 0;
973 else
974 err = nfserrno(err);
975out:
976 return err;
977}
978
979/*
980 * Read data from a file. count must contain the requested read count
981 * on entry. On return, *count contains the number of bytes actually read.
982 * N.B. After this call fhp needs an fh_put
983 */
984int
985nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
986 loff_t offset, struct kvec *vec, int vlen,
987 unsigned long *count)
988{
989 int err;
990
991 if (file) {
992 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
993 MAY_READ|MAY_OWNER_OVERRIDE);
994 if (err)
995 goto out;
996 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
997 } else {
998 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
999 if (err)
1000 goto out;
1001 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1002 nfsd_close(file);
1003 }
1004out:
1005 return err;
1006}
1007
1008/*
1009 * Write data to a file.
1010 * The stable flag requests synchronous writes.
1011 * N.B. After this call fhp needs an fh_put
1012 */
1013int
1014nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1015 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1016 int *stablep)
1017{
1018 int err = 0;
1019
1020 if (file) {
1021 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1022 MAY_WRITE|MAY_OWNER_OVERRIDE);
1023 if (err)
1024 goto out;
1025 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1026 stablep);
1027 } else {
1028 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1029 if (err)
1030 goto out;
1031
1032 if (cnt)
1033 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1034 cnt, stablep);
1035 nfsd_close(file);
1036 }
1037out:
1038 return err;
1039}
1040
1041#ifdef CONFIG_NFSD_V3
1042/*
1043 * Commit all pending writes to stable storage.
1044 * Strictly speaking, we could sync just the indicated file region here,
1045 * but there's currently no way we can ask the VFS to do so.
1046 *
1047 * Unfortunately we cannot lock the file to make sure we return full WCC
1048 * data to the client, as locking happens lower down in the filesystem.
1049 */
1050int
1051nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1052 loff_t offset, unsigned long count)
1053{
1054 struct file *file;
1055 int err;
1056
1057 if ((u64)count > ~(u64)offset)
1058 return nfserr_inval;
1059
1060 if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1061 return err;
1062 if (EX_ISSYNC(fhp->fh_export)) {
1063 if (file->f_op && file->f_op->fsync) {
NeilBrown45bd3b32006-01-18 17:43:50 -08001064 err = nfserrno(nfsd_sync(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 } else {
1066 err = nfserr_notsupp;
1067 }
1068 }
1069
1070 nfsd_close(file);
1071 return err;
1072}
1073#endif /* CONFIG_NFSD_V3 */
1074
1075/*
1076 * Create a file (regular, directory, device, fifo); UNIX sockets
1077 * not yet implemented.
1078 * If the response fh has been verified, the parent directory should
1079 * already be locked. Note that the parent directory is left locked.
1080 *
1081 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1082 */
1083int
1084nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1085 char *fname, int flen, struct iattr *iap,
1086 int type, dev_t rdev, struct svc_fh *resfhp)
1087{
1088 struct dentry *dentry, *dchild = NULL;
1089 struct inode *dirp;
1090 int err;
1091
1092 err = nfserr_perm;
1093 if (!flen)
1094 goto out;
1095 err = nfserr_exist;
1096 if (isdotent(fname, flen))
1097 goto out;
1098
1099 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1100 if (err)
1101 goto out;
1102
1103 dentry = fhp->fh_dentry;
1104 dirp = dentry->d_inode;
1105
1106 err = nfserr_notdir;
1107 if(!dirp->i_op || !dirp->i_op->lookup)
1108 goto out;
1109 /*
1110 * Check whether the response file handle has been verified yet.
1111 * If it has, the parent directory should already be locked.
1112 */
1113 if (!resfhp->fh_dentry) {
1114 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1115 fh_lock(fhp);
1116 dchild = lookup_one_len(fname, dentry, flen);
1117 err = PTR_ERR(dchild);
1118 if (IS_ERR(dchild))
1119 goto out_nfserr;
1120 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1121 if (err)
1122 goto out;
1123 } else {
1124 /* called from nfsd_proc_create */
1125 dchild = dget(resfhp->fh_dentry);
1126 if (!fhp->fh_locked) {
1127 /* not actually possible */
1128 printk(KERN_ERR
1129 "nfsd_create: parent %s/%s not locked!\n",
1130 dentry->d_parent->d_name.name,
1131 dentry->d_name.name);
Al Virod75f2b92006-01-18 17:43:44 -08001132 err = nfserr_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 goto out;
1134 }
1135 }
1136 /*
1137 * Make sure the child dentry is still negative ...
1138 */
1139 err = nfserr_exist;
1140 if (dchild->d_inode) {
1141 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1142 dentry->d_name.name, dchild->d_name.name);
1143 goto out;
1144 }
1145
1146 if (!(iap->ia_valid & ATTR_MODE))
1147 iap->ia_mode = 0;
1148 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1149
1150 /*
1151 * Get the dir op function pointer.
1152 */
1153 err = nfserr_perm;
1154 switch (type) {
1155 case S_IFREG:
1156 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1157 break;
1158 case S_IFDIR:
1159 err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1160 break;
1161 case S_IFCHR:
1162 case S_IFBLK:
1163 case S_IFIFO:
1164 case S_IFSOCK:
1165 err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1166 break;
1167 default:
1168 printk("nfsd: bad file type %o in nfsd_create\n", type);
1169 err = -EINVAL;
1170 }
1171 if (err < 0)
1172 goto out_nfserr;
1173
1174 if (EX_ISSYNC(fhp->fh_export)) {
NeilBrown45bd3b32006-01-18 17:43:50 -08001175 err = nfserrno(nfsd_sync_dir(dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 write_inode_now(dchild->d_inode, 1);
1177 }
1178
1179
1180 /* Set file attributes. Mode has already been set and
1181 * setting uid/gid works only for root. Irix appears to
1182 * send along the gid when it tries to implement setgid
1183 * directories via NFS.
1184 */
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001185 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1186 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1187 if (err2)
1188 err = err2;
1189 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 /*
1191 * Update the file handle to get the new inode info.
1192 */
1193 if (!err)
1194 err = fh_update(resfhp);
1195out:
1196 if (dchild && !IS_ERR(dchild))
1197 dput(dchild);
1198 return err;
1199
1200out_nfserr:
1201 err = nfserrno(err);
1202 goto out;
1203}
1204
1205#ifdef CONFIG_NFSD_V3
1206/*
1207 * NFSv3 version of nfsd_create
1208 */
1209int
1210nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1211 char *fname, int flen, struct iattr *iap,
1212 struct svc_fh *resfhp, int createmode, u32 *verifier,
1213 int *truncp)
1214{
1215 struct dentry *dentry, *dchild = NULL;
1216 struct inode *dirp;
1217 int err;
1218 __u32 v_mtime=0, v_atime=0;
1219 int v_mode=0;
1220
1221 err = nfserr_perm;
1222 if (!flen)
1223 goto out;
1224 err = nfserr_exist;
1225 if (isdotent(fname, flen))
1226 goto out;
1227 if (!(iap->ia_valid & ATTR_MODE))
1228 iap->ia_mode = 0;
1229 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1230 if (err)
1231 goto out;
1232
1233 dentry = fhp->fh_dentry;
1234 dirp = dentry->d_inode;
1235
1236 /* Get all the sanity checks out of the way before
1237 * we lock the parent. */
1238 err = nfserr_notdir;
1239 if(!dirp->i_op || !dirp->i_op->lookup)
1240 goto out;
1241 fh_lock(fhp);
1242
1243 /*
1244 * Compose the response file handle.
1245 */
1246 dchild = lookup_one_len(fname, dentry, flen);
1247 err = PTR_ERR(dchild);
1248 if (IS_ERR(dchild))
1249 goto out_nfserr;
1250
1251 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1252 if (err)
1253 goto out;
1254
1255 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1256 /* while the verifier would fit in mtime+atime,
1257 * solaris7 gets confused (bugid 4218508) if these have
1258 * the high bit set, so we use the mode as well
1259 */
1260 v_mtime = verifier[0]&0x7fffffff;
1261 v_atime = verifier[1]&0x7fffffff;
1262 v_mode = S_IFREG
1263 | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */
1264 | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */
1265 ;
1266 }
1267
1268 if (dchild->d_inode) {
1269 err = 0;
1270
1271 switch (createmode) {
1272 case NFS3_CREATE_UNCHECKED:
1273 if (! S_ISREG(dchild->d_inode->i_mode))
1274 err = nfserr_exist;
1275 else if (truncp) {
1276 /* in nfsv4, we need to treat this case a little
1277 * differently. we don't want to truncate the
1278 * file now; this would be wrong if the OPEN
1279 * fails for some other reason. furthermore,
1280 * if the size is nonzero, we should ignore it
1281 * according to spec!
1282 */
1283 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1284 }
1285 else {
1286 iap->ia_valid &= ATTR_SIZE;
1287 goto set_attr;
1288 }
1289 break;
1290 case NFS3_CREATE_EXCLUSIVE:
1291 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1292 && dchild->d_inode->i_atime.tv_sec == v_atime
1293 && dchild->d_inode->i_mode == v_mode
1294 && dchild->d_inode->i_size == 0 )
1295 break;
1296 /* fallthru */
1297 case NFS3_CREATE_GUARDED:
1298 err = nfserr_exist;
1299 }
1300 goto out;
1301 }
1302
1303 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1304 if (err < 0)
1305 goto out_nfserr;
1306
1307 if (EX_ISSYNC(fhp->fh_export)) {
NeilBrown45bd3b32006-01-18 17:43:50 -08001308 err = nfserrno(nfsd_sync_dir(dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 /* setattr will sync the child (or not) */
1310 }
1311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1313 /* Cram the verifier into atime/mtime/mode */
1314 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1315 | ATTR_MTIME_SET|ATTR_ATIME_SET
1316 | ATTR_MODE;
1317 /* XXX someone who knows this better please fix it for nsec */
1318 iap->ia_mtime.tv_sec = v_mtime;
1319 iap->ia_atime.tv_sec = v_atime;
1320 iap->ia_mtime.tv_nsec = 0;
1321 iap->ia_atime.tv_nsec = 0;
1322 iap->ia_mode = v_mode;
1323 }
1324
1325 /* Set file attributes.
1326 * Mode has already been set but we might need to reset it
1327 * for CREATE_EXCLUSIVE
1328 * Irix appears to send along the gid when it tries to
1329 * implement setgid directories via NFS. Clear out all that cruft.
1330 */
1331 set_attr:
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001332 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) {
1333 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1334 if (err2)
NeilBrown45bd3b32006-01-18 17:43:50 -08001335 err = err2;
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001336 }
1337
1338 /*
1339 * Update the filehandle to get the new inode info.
1340 */
1341 if (!err)
1342 err = fh_update(resfhp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
1344 out:
1345 fh_unlock(fhp);
1346 if (dchild && !IS_ERR(dchild))
1347 dput(dchild);
1348 return err;
1349
1350 out_nfserr:
1351 err = nfserrno(err);
1352 goto out;
1353}
1354#endif /* CONFIG_NFSD_V3 */
1355
1356/*
1357 * Read a symlink. On entry, *lenp must contain the maximum path length that
1358 * fits into the buffer. On return, it contains the true length.
1359 * N.B. After this call fhp needs an fh_put
1360 */
1361int
1362nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1363{
1364 struct dentry *dentry;
1365 struct inode *inode;
1366 mm_segment_t oldfs;
1367 int err;
1368
1369 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1370 if (err)
1371 goto out;
1372
1373 dentry = fhp->fh_dentry;
1374 inode = dentry->d_inode;
1375
1376 err = nfserr_inval;
1377 if (!inode->i_op || !inode->i_op->readlink)
1378 goto out;
1379
1380 touch_atime(fhp->fh_export->ex_mnt, dentry);
1381 /* N.B. Why does this call need a get_fs()??
1382 * Remove the set_fs and watch the fireworks:-) --okir
1383 */
1384
1385 oldfs = get_fs(); set_fs(KERNEL_DS);
1386 err = inode->i_op->readlink(dentry, buf, *lenp);
1387 set_fs(oldfs);
1388
1389 if (err < 0)
1390 goto out_nfserr;
1391 *lenp = err;
1392 err = 0;
1393out:
1394 return err;
1395
1396out_nfserr:
1397 err = nfserrno(err);
1398 goto out;
1399}
1400
1401/*
1402 * Create a symlink and look up its inode
1403 * N.B. After this call _both_ fhp and resfhp need an fh_put
1404 */
1405int
1406nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1407 char *fname, int flen,
1408 char *path, int plen,
1409 struct svc_fh *resfhp,
1410 struct iattr *iap)
1411{
1412 struct dentry *dentry, *dnew;
1413 int err, cerr;
1414 umode_t mode;
1415
1416 err = nfserr_noent;
1417 if (!flen || !plen)
1418 goto out;
1419 err = nfserr_exist;
1420 if (isdotent(fname, flen))
1421 goto out;
1422
1423 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1424 if (err)
1425 goto out;
1426 fh_lock(fhp);
1427 dentry = fhp->fh_dentry;
1428 dnew = lookup_one_len(fname, dentry, flen);
1429 err = PTR_ERR(dnew);
1430 if (IS_ERR(dnew))
1431 goto out_nfserr;
1432
1433 mode = S_IALLUGO;
1434 /* Only the MODE ATTRibute is even vaguely meaningful */
1435 if (iap && (iap->ia_valid & ATTR_MODE))
1436 mode = iap->ia_mode & S_IALLUGO;
1437
1438 if (unlikely(path[plen] != 0)) {
1439 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1440 if (path_alloced == NULL)
1441 err = -ENOMEM;
1442 else {
1443 strncpy(path_alloced, path, plen);
1444 path_alloced[plen] = 0;
1445 err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1446 kfree(path_alloced);
1447 }
1448 } else
1449 err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1450
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001451 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 if (EX_ISSYNC(fhp->fh_export))
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001453 err = nfsd_sync_dir(dentry);
1454 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 err = nfserrno(err);
1456 fh_unlock(fhp);
1457
1458 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1459 dput(dnew);
1460 if (err==0) err = cerr;
1461out:
1462 return err;
1463
1464out_nfserr:
1465 err = nfserrno(err);
1466 goto out;
1467}
1468
1469/*
1470 * Create a hardlink
1471 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1472 */
1473int
1474nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1475 char *name, int len, struct svc_fh *tfhp)
1476{
1477 struct dentry *ddir, *dnew, *dold;
1478 struct inode *dirp, *dest;
1479 int err;
1480
1481 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1482 if (err)
1483 goto out;
1484 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1485 if (err)
1486 goto out;
1487
1488 err = nfserr_perm;
1489 if (!len)
1490 goto out;
1491 err = nfserr_exist;
1492 if (isdotent(name, len))
1493 goto out;
1494
1495 fh_lock(ffhp);
1496 ddir = ffhp->fh_dentry;
1497 dirp = ddir->d_inode;
1498
1499 dnew = lookup_one_len(name, ddir, len);
1500 err = PTR_ERR(dnew);
1501 if (IS_ERR(dnew))
1502 goto out_nfserr;
1503
1504 dold = tfhp->fh_dentry;
1505 dest = dold->d_inode;
1506
1507 err = vfs_link(dold, dirp, dnew);
1508 if (!err) {
1509 if (EX_ISSYNC(ffhp->fh_export)) {
NeilBrown45bd3b32006-01-18 17:43:50 -08001510 err = nfserrno(nfsd_sync_dir(ddir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 write_inode_now(dest, 1);
1512 }
1513 } else {
1514 if (err == -EXDEV && rqstp->rq_vers == 2)
1515 err = nfserr_acces;
1516 else
1517 err = nfserrno(err);
1518 }
1519
1520 fh_unlock(ffhp);
1521 dput(dnew);
1522out:
1523 return err;
1524
1525out_nfserr:
1526 err = nfserrno(err);
1527 goto out;
1528}
1529
1530/*
1531 * Rename a file
1532 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1533 */
1534int
1535nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1536 struct svc_fh *tfhp, char *tname, int tlen)
1537{
1538 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1539 struct inode *fdir, *tdir;
1540 int err;
1541
1542 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1543 if (err)
1544 goto out;
1545 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1546 if (err)
1547 goto out;
1548
1549 fdentry = ffhp->fh_dentry;
1550 fdir = fdentry->d_inode;
1551
1552 tdentry = tfhp->fh_dentry;
1553 tdir = tdentry->d_inode;
1554
1555 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1556 if (fdir->i_sb != tdir->i_sb)
1557 goto out;
1558
1559 err = nfserr_perm;
1560 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1561 goto out;
1562
1563 /* cannot use fh_lock as we need deadlock protective ordering
1564 * so do it by hand */
1565 trap = lock_rename(tdentry, fdentry);
1566 ffhp->fh_locked = tfhp->fh_locked = 1;
1567 fill_pre_wcc(ffhp);
1568 fill_pre_wcc(tfhp);
1569
1570 odentry = lookup_one_len(fname, fdentry, flen);
1571 err = PTR_ERR(odentry);
1572 if (IS_ERR(odentry))
1573 goto out_nfserr;
1574
1575 err = -ENOENT;
1576 if (!odentry->d_inode)
1577 goto out_dput_old;
1578 err = -EINVAL;
1579 if (odentry == trap)
1580 goto out_dput_old;
1581
1582 ndentry = lookup_one_len(tname, tdentry, tlen);
1583 err = PTR_ERR(ndentry);
1584 if (IS_ERR(ndentry))
1585 goto out_dput_old;
1586 err = -ENOTEMPTY;
1587 if (ndentry == trap)
1588 goto out_dput_new;
1589
1590#ifdef MSNFS
1591 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1592 ((atomic_read(&odentry->d_count) > 1)
1593 || (atomic_read(&ndentry->d_count) > 1))) {
Al Virod75f2b92006-01-18 17:43:44 -08001594 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 } else
1596#endif
1597 err = vfs_rename(fdir, odentry, tdir, ndentry);
1598 if (!err && EX_ISSYNC(tfhp->fh_export)) {
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001599 err = nfsd_sync_dir(tdentry);
1600 if (!err)
1601 err = nfsd_sync_dir(fdentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 }
1603
1604 out_dput_new:
1605 dput(ndentry);
1606 out_dput_old:
1607 dput(odentry);
1608 out_nfserr:
1609 if (err)
1610 err = nfserrno(err);
1611
1612 /* we cannot reply on fh_unlock on the two filehandles,
1613 * as that would do the wrong thing if the two directories
1614 * were the same, so again we do it by hand
1615 */
1616 fill_post_wcc(ffhp);
1617 fill_post_wcc(tfhp);
1618 unlock_rename(tdentry, fdentry);
1619 ffhp->fh_locked = tfhp->fh_locked = 0;
1620
1621out:
1622 return err;
1623}
1624
1625/*
1626 * Unlink a file or directory
1627 * N.B. After this call fhp needs an fh_put
1628 */
1629int
1630nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1631 char *fname, int flen)
1632{
1633 struct dentry *dentry, *rdentry;
1634 struct inode *dirp;
1635 int err;
1636
1637 err = nfserr_acces;
1638 if (!flen || isdotent(fname, flen))
1639 goto out;
1640 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1641 if (err)
1642 goto out;
1643
1644 fh_lock(fhp);
1645 dentry = fhp->fh_dentry;
1646 dirp = dentry->d_inode;
1647
1648 rdentry = lookup_one_len(fname, dentry, flen);
1649 err = PTR_ERR(rdentry);
1650 if (IS_ERR(rdentry))
1651 goto out_nfserr;
1652
1653 if (!rdentry->d_inode) {
1654 dput(rdentry);
1655 err = nfserr_noent;
1656 goto out;
1657 }
1658
1659 if (!type)
1660 type = rdentry->d_inode->i_mode & S_IFMT;
1661
1662 if (type != S_IFDIR) { /* It's UNLINK */
1663#ifdef MSNFS
1664 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1665 (atomic_read(&rdentry->d_count) > 1)) {
Al Virod75f2b92006-01-18 17:43:44 -08001666 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 } else
1668#endif
1669 err = vfs_unlink(dirp, rdentry);
1670 } else { /* It's RMDIR */
1671 err = vfs_rmdir(dirp, rdentry);
1672 }
1673
1674 dput(rdentry);
1675
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001676 if (err == 0 &&
1677 EX_ISSYNC(fhp->fh_export))
1678 err = nfsd_sync_dir(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679
1680out_nfserr:
1681 err = nfserrno(err);
YAMAMOTO Takashif193fba2006-01-18 17:43:13 -08001682out:
1683 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684}
1685
1686/*
1687 * Read entries from a directory.
1688 * The NFSv3/4 verifier we ignore for now.
1689 */
1690int
1691nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1692 struct readdir_cd *cdp, encode_dent_fn func)
1693{
1694 int err;
1695 struct file *file;
1696 loff_t offset = *offsetp;
1697
1698 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1699 if (err)
1700 goto out;
1701
1702 offset = vfs_llseek(file, offset, 0);
1703 if (offset < 0) {
1704 err = nfserrno((int)offset);
1705 goto out_close;
1706 }
1707
1708 /*
1709 * Read the directory entries. This silly loop is necessary because
1710 * readdir() is not guaranteed to fill up the entire buffer, but
1711 * may choose to do less.
1712 */
1713
1714 do {
1715 cdp->err = nfserr_eof; /* will be cleared on successful read */
1716 err = vfs_readdir(file, (filldir_t) func, cdp);
1717 } while (err >=0 && cdp->err == nfs_ok);
1718 if (err)
1719 err = nfserrno(err);
1720 else
1721 err = cdp->err;
1722 *offsetp = vfs_llseek(file, 0, 1);
1723
1724 if (err == nfserr_eof || err == nfserr_toosmall)
1725 err = nfs_ok; /* can still be found in ->err */
1726out_close:
1727 nfsd_close(file);
1728out:
1729 return err;
1730}
1731
1732/*
1733 * Get file system stats
1734 * N.B. After this call fhp needs an fh_put
1735 */
1736int
1737nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1738{
1739 int err = fh_verify(rqstp, fhp, 0, MAY_NOP);
David Howells726c3342006-06-23 02:02:58 -07001740 if (!err && vfs_statfs(fhp->fh_dentry,stat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 err = nfserr_io;
1742 return err;
1743}
1744
1745/*
1746 * Check for a user's access permissions to this inode.
1747 */
1748int
1749nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1750{
1751 struct inode *inode = dentry->d_inode;
1752 int err;
1753
1754 if (acc == MAY_NOP)
1755 return 0;
1756#if 0
1757 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1758 acc,
1759 (acc & MAY_READ)? " read" : "",
1760 (acc & MAY_WRITE)? " write" : "",
1761 (acc & MAY_EXEC)? " exec" : "",
1762 (acc & MAY_SATTR)? " sattr" : "",
1763 (acc & MAY_TRUNC)? " trunc" : "",
1764 (acc & MAY_LOCK)? " lock" : "",
1765 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1766 inode->i_mode,
1767 IS_IMMUTABLE(inode)? " immut" : "",
1768 IS_APPEND(inode)? " append" : "",
1769 IS_RDONLY(inode)? " ro" : "");
1770 dprintk(" owner %d/%d user %d/%d\n",
1771 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1772#endif
1773
1774 /* Normally we reject any write/sattr etc access on a read-only file
1775 * system. But if it is IRIX doing check on write-access for a
1776 * device special file, we ignore rofs.
1777 */
1778 if (!(acc & MAY_LOCAL_ACCESS))
1779 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1780 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1781 return nfserr_rofs;
1782 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1783 return nfserr_perm;
1784 }
1785 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1786 return nfserr_perm;
1787
1788 if (acc & MAY_LOCK) {
1789 /* If we cannot rely on authentication in NLM requests,
1790 * just allow locks, otherwise require read permission, or
1791 * ownership
1792 */
1793 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1794 return 0;
1795 else
1796 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1797 }
1798 /*
1799 * The file owner always gets access permission for accesses that
1800 * would normally be checked at open time. This is to make
1801 * file access work even when the client has done a fchmod(fd, 0).
1802 *
1803 * However, `cp foo bar' should fail nevertheless when bar is
1804 * readonly. A sensible way to do this might be to reject all
1805 * attempts to truncate a read-only file, because a creat() call
1806 * always implies file truncation.
1807 * ... but this isn't really fair. A process may reasonably call
1808 * ftruncate on an open file descriptor on a file with perm 000.
1809 * We must trust the client to do permission checking - using "ACCESS"
1810 * with NFSv3.
1811 */
1812 if ((acc & MAY_OWNER_OVERRIDE) &&
1813 inode->i_uid == current->fsuid)
1814 return 0;
1815
1816 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1817
1818 /* Allow read access to binaries even when mode 111 */
1819 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1820 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1821 err = permission(inode, MAY_EXEC, NULL);
1822
1823 return err? nfserrno(err) : 0;
1824}
1825
1826void
1827nfsd_racache_shutdown(void)
1828{
1829 if (!raparm_cache)
1830 return;
1831 dprintk("nfsd: freeing readahead buffers.\n");
1832 kfree(raparml);
1833 raparm_cache = raparml = NULL;
1834}
1835/*
1836 * Initialize readahead param cache
1837 */
1838int
1839nfsd_racache_init(int cache_size)
1840{
1841 int i;
1842
1843 if (raparm_cache)
1844 return 0;
1845 raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL);
1846
1847 if (raparml != NULL) {
1848 dprintk("nfsd: allocating %d readahead buffers.\n",
1849 cache_size);
1850 memset(raparml, 0, sizeof(struct raparms) * cache_size);
1851 for (i = 0; i < cache_size - 1; i++) {
1852 raparml[i].p_next = raparml + i + 1;
1853 }
1854 raparm_cache = raparml;
1855 } else {
1856 printk(KERN_WARNING
1857 "nfsd: Could not allocate memory read-ahead cache.\n");
1858 return -ENOMEM;
1859 }
1860 nfsdstats.ra_size = cache_size;
1861 return 0;
1862}
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001863
1864#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1865struct posix_acl *
1866nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1867{
1868 struct inode *inode = fhp->fh_dentry->d_inode;
1869 char *name;
1870 void *value = NULL;
1871 ssize_t size;
1872 struct posix_acl *acl;
1873
Christoph Hellwig5be196e2006-01-09 20:51:55 -08001874 if (!IS_POSIXACL(inode))
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001875 return ERR_PTR(-EOPNOTSUPP);
Christoph Hellwig5be196e2006-01-09 20:51:55 -08001876
1877 switch (type) {
1878 case ACL_TYPE_ACCESS:
1879 name = POSIX_ACL_XATTR_ACCESS;
1880 break;
1881 case ACL_TYPE_DEFAULT:
1882 name = POSIX_ACL_XATTR_DEFAULT;
1883 break;
1884 default:
1885 return ERR_PTR(-EOPNOTSUPP);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001886 }
1887
Christoph Hellwig5be196e2006-01-09 20:51:55 -08001888 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1889 if (size < 0)
1890 return ERR_PTR(size);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001891
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001892 acl = posix_acl_from_xattr(value, size);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001893 kfree(value);
1894 return acl;
1895}
1896
1897int
1898nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1899{
1900 struct inode *inode = fhp->fh_dentry->d_inode;
1901 char *name;
1902 void *value = NULL;
1903 size_t size;
1904 int error;
1905
1906 if (!IS_POSIXACL(inode) || !inode->i_op ||
1907 !inode->i_op->setxattr || !inode->i_op->removexattr)
1908 return -EOPNOTSUPP;
1909 switch(type) {
1910 case ACL_TYPE_ACCESS:
Christoph Hellwig334a13e2005-06-28 20:44:58 -07001911 name = POSIX_ACL_XATTR_ACCESS;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001912 break;
1913 case ACL_TYPE_DEFAULT:
Christoph Hellwig334a13e2005-06-28 20:44:58 -07001914 name = POSIX_ACL_XATTR_DEFAULT;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001915 break;
1916 default:
1917 return -EOPNOTSUPP;
1918 }
1919
1920 if (acl && acl->a_count) {
Christoph Hellwig334a13e2005-06-28 20:44:58 -07001921 size = posix_acl_xattr_size(acl->a_count);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001922 value = kmalloc(size, GFP_KERNEL);
1923 if (!value)
1924 return -ENOMEM;
Florin Malita9ccfc292006-05-20 14:59:58 -07001925 error = posix_acl_to_xattr(acl, value, size);
1926 if (error < 0)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001927 goto getout;
Florin Malita9ccfc292006-05-20 14:59:58 -07001928 size = error;
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001929 } else
1930 size = 0;
1931
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001932 if (size)
Christoph Hellwig5be196e2006-01-09 20:51:55 -08001933 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001934 else {
1935 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1936 error = 0;
1937 else {
Christoph Hellwig5be196e2006-01-09 20:51:55 -08001938 error = vfs_removexattr(fhp->fh_dentry, name);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +00001939 if (error == -ENODATA)
1940 error = 0;
1941 }
1942 }
1943
1944getout:
1945 kfree(value);
1946 return error;
1947}
1948#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */