xref: /openbmc/linux/fs/nfsd/vfs.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 #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/string.h>
20 #include <linux/time.h>
21 #include <linux/errno.h>
22 #include <linux/fs.h>
23 #include <linux/file.h>
24 #include <linux/mount.h>
25 #include <linux/major.h>
26 #include <linux/ext2_fs.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stat.h>
29 #include <linux/fcntl.h>
30 #include <linux/net.h>
31 #include <linux/unistd.h>
32 #include <linux/slab.h>
33 #include <linux/pagemap.h>
34 #include <linux/in.h>
35 #include <linux/module.h>
36 #include <linux/namei.h>
37 #include <linux/vfs.h>
38 #include <linux/delay.h>
39 #include <linux/sunrpc/svc.h>
40 #include <linux/nfsd/nfsd.h>
41 #ifdef CONFIG_NFSD_V3
42 #include <linux/nfs3.h>
43 #include <linux/nfsd/xdr3.h>
44 #endif /* CONFIG_NFSD_V3 */
45 #include <linux/nfsd/nfsfh.h>
46 #include <linux/quotaops.h>
47 #include <linux/fsnotify.h>
48 #include <linux/posix_acl.h>
49 #include <linux/posix_acl_xattr.h>
50 #include <linux/xattr.h>
51 #ifdef CONFIG_NFSD_V4
52 #include <linux/nfs4.h>
53 #include <linux/nfs4_acl.h>
54 #include <linux/nfsd_idmap.h>
55 #include <linux/security.h>
56 #endif /* CONFIG_NFSD_V4 */
57 #include <linux/jhash.h>
58 
59 #include <asm/uaccess.h>
60 
61 #define NFSDDBG_FACILITY		NFSDDBG_FILEOP
62 
63 
64 /* We must ignore files (but only files) which might have mandatory
65  * locks on them because there is no way to know if the accesser has
66  * the lock.
67  */
68 #define IS_ISMNDLK(i)	(S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
69 
70 /*
71  * This is a cache of readahead params that help us choose the proper
72  * readahead strategy. Initially, we set all readahead parameters to 0
73  * and let the VFS handle things.
74  * If you increase the number of cached files very much, you'll need to
75  * add a hash table here.
76  */
77 struct raparms {
78 	struct raparms		*p_next;
79 	unsigned int		p_count;
80 	ino_t			p_ino;
81 	dev_t			p_dev;
82 	int			p_set;
83 	struct file_ra_state	p_ra;
84 	unsigned int		p_hindex;
85 };
86 
87 struct raparm_hbucket {
88 	struct raparms		*pb_head;
89 	spinlock_t		pb_lock;
90 } ____cacheline_aligned_in_smp;
91 
92 static struct raparms *		raparml;
93 #define RAPARM_HASH_BITS	4
94 #define RAPARM_HASH_SIZE	(1<<RAPARM_HASH_BITS)
95 #define RAPARM_HASH_MASK	(RAPARM_HASH_SIZE-1)
96 static struct raparm_hbucket	raparm_hash[RAPARM_HASH_SIZE];
97 
98 /*
99  * Called from nfsd_lookup and encode_dirent. Check if we have crossed
100  * a mount point.
101  * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
102  *  or nfs_ok having possibly changed *dpp and *expp
103  */
104 int
105 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
106 		        struct svc_export **expp)
107 {
108 	struct svc_export *exp = *expp, *exp2 = NULL;
109 	struct dentry *dentry = *dpp;
110 	struct vfsmount *mnt = mntget(exp->ex_mnt);
111 	struct dentry *mounts = dget(dentry);
112 	int err = 0;
113 
114 	while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
115 
116 	exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
117 	if (IS_ERR(exp2)) {
118 		err = PTR_ERR(exp2);
119 		dput(mounts);
120 		mntput(mnt);
121 		goto out;
122 	}
123 	if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
124 		/* successfully crossed mount point */
125 		exp_put(exp);
126 		*expp = exp2;
127 		dput(dentry);
128 		*dpp = mounts;
129 	} else {
130 		if (exp2) exp_put(exp2);
131 		dput(mounts);
132 	}
133 	mntput(mnt);
134 out:
135 	return err;
136 }
137 
138 /*
139  * Look up one component of a pathname.
140  * N.B. After this call _both_ fhp and resfh need an fh_put
141  *
142  * If the lookup would cross a mountpoint, and the mounted filesystem
143  * is exported to the client with NFSEXP_NOHIDE, then the lookup is
144  * accepted as it stands and the mounted directory is
145  * returned. Otherwise the covered directory is returned.
146  * NOTE: this mountpoint crossing is not supported properly by all
147  *   clients and is explicitly disallowed for NFSv3
148  *      NeilBrown <neilb@cse.unsw.edu.au>
149  */
150 __be32
151 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
152 					int len, struct svc_fh *resfh)
153 {
154 	struct svc_export	*exp;
155 	struct dentry		*dparent;
156 	struct dentry		*dentry;
157 	__be32			err;
158 	int			host_err;
159 
160 	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
161 
162 	/* Obtain dentry and export. */
163 	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
164 	if (err)
165 		return err;
166 
167 	dparent = fhp->fh_dentry;
168 	exp  = fhp->fh_export;
169 	exp_get(exp);
170 
171 	err = nfserr_acces;
172 
173 	/* Lookup the name, but don't follow links */
174 	if (isdotent(name, len)) {
175 		if (len==1)
176 			dentry = dget(dparent);
177 		else if (dparent != exp->ex_dentry) {
178 			dentry = dget_parent(dparent);
179 		} else  if (!EX_NOHIDE(exp))
180 			dentry = dget(dparent); /* .. == . just like at / */
181 		else {
182 			/* checking mountpoint crossing is very different when stepping up */
183 			struct svc_export *exp2 = NULL;
184 			struct dentry *dp;
185 			struct vfsmount *mnt = mntget(exp->ex_mnt);
186 			dentry = dget(dparent);
187 			while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
188 				;
189 			dp = dget_parent(dentry);
190 			dput(dentry);
191 			dentry = dp;
192 
193 			exp2 = exp_parent(exp->ex_client, mnt, dentry,
194 					  &rqstp->rq_chandle);
195 			if (IS_ERR(exp2)) {
196 				host_err = PTR_ERR(exp2);
197 				dput(dentry);
198 				mntput(mnt);
199 				goto out_nfserr;
200 			}
201 			if (!exp2) {
202 				dput(dentry);
203 				dentry = dget(dparent);
204 			} else {
205 				exp_put(exp);
206 				exp = exp2;
207 			}
208 			mntput(mnt);
209 		}
210 	} else {
211 		fh_lock(fhp);
212 		dentry = lookup_one_len(name, dparent, len);
213 		host_err = PTR_ERR(dentry);
214 		if (IS_ERR(dentry))
215 			goto out_nfserr;
216 		/*
217 		 * check if we have crossed a mount point ...
218 		 */
219 		if (d_mountpoint(dentry)) {
220 			if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
221 				dput(dentry);
222 				goto out_nfserr;
223 			}
224 		}
225 	}
226 	/*
227 	 * Note: we compose the file handle now, but as the
228 	 * dentry may be negative, it may need to be updated.
229 	 */
230 	err = fh_compose(resfh, exp, dentry, fhp);
231 	if (!err && !dentry->d_inode)
232 		err = nfserr_noent;
233 	dput(dentry);
234 out:
235 	exp_put(exp);
236 	return err;
237 
238 out_nfserr:
239 	err = nfserrno(host_err);
240 	goto out;
241 }
242 
243 /*
244  * Set various file attributes.
245  * N.B. After this call fhp needs an fh_put
246  */
247 __be32
248 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
249 	     int check_guard, time_t guardtime)
250 {
251 	struct dentry	*dentry;
252 	struct inode	*inode;
253 	int		accmode = MAY_SATTR;
254 	int		ftype = 0;
255 	int		imode;
256 	__be32		err;
257 	int		host_err;
258 	int		size_change = 0;
259 
260 	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
261 		accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
262 	if (iap->ia_valid & ATTR_SIZE)
263 		ftype = S_IFREG;
264 
265 	/* Get inode */
266 	err = fh_verify(rqstp, fhp, ftype, accmode);
267 	if (err)
268 		goto out;
269 
270 	dentry = fhp->fh_dentry;
271 	inode = dentry->d_inode;
272 
273 	/* Ignore any mode updates on symlinks */
274 	if (S_ISLNK(inode->i_mode))
275 		iap->ia_valid &= ~ATTR_MODE;
276 
277 	if (!iap->ia_valid)
278 		goto out;
279 
280 	/* NFSv2 does not differentiate between "set-[ac]time-to-now"
281 	 * which only requires access, and "set-[ac]time-to-X" which
282 	 * requires ownership.
283 	 * So if it looks like it might be "set both to the same time which
284 	 * is close to now", and if inode_change_ok fails, then we
285 	 * convert to "set to now" instead of "set to explicit time"
286 	 *
287 	 * We only call inode_change_ok as the last test as technically
288 	 * it is not an interface that we should be using.  It is only
289 	 * valid if the filesystem does not define it's own i_op->setattr.
290 	 */
291 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
292 #define	MAX_TOUCH_TIME_ERROR (30*60)
293 	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
294 	    && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
295 	    ) {
296 	    /* Looks probable.  Now just make sure time is in the right ballpark.
297 	     * Solaris, at least, doesn't seem to care what the time request is.
298 	     * We require it be within 30 minutes of now.
299 	     */
300 	    time_t delta = iap->ia_atime.tv_sec - get_seconds();
301 	    if (delta<0) delta = -delta;
302 	    if (delta < MAX_TOUCH_TIME_ERROR &&
303 		inode_change_ok(inode, iap) != 0) {
304 		/* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
305 		 * this will cause notify_change to set these times to "now"
306 		 */
307 		iap->ia_valid &= ~BOTH_TIME_SET;
308 	    }
309 	}
310 
311 	/* The size case is special. It changes the file as well as the attributes.  */
312 	if (iap->ia_valid & ATTR_SIZE) {
313 		if (iap->ia_size < inode->i_size) {
314 			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
315 			if (err)
316 				goto out;
317 		}
318 
319 		/*
320 		 * If we are changing the size of the file, then
321 		 * we need to break all leases.
322 		 */
323 		host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
324 		if (host_err == -EWOULDBLOCK)
325 			host_err = -ETIMEDOUT;
326 		if (host_err) /* ENOMEM or EWOULDBLOCK */
327 			goto out_nfserr;
328 
329 		host_err = get_write_access(inode);
330 		if (host_err)
331 			goto out_nfserr;
332 
333 		size_change = 1;
334 		host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
335 		if (host_err) {
336 			put_write_access(inode);
337 			goto out_nfserr;
338 		}
339 		DQUOT_INIT(inode);
340 	}
341 
342 	imode = inode->i_mode;
343 	if (iap->ia_valid & ATTR_MODE) {
344 		iap->ia_mode &= S_IALLUGO;
345 		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
346 	}
347 
348 	/* Revoke setuid/setgid bit on chown/chgrp */
349 	if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
350 		iap->ia_valid |= ATTR_KILL_SUID;
351 	if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
352 		iap->ia_valid |= ATTR_KILL_SGID;
353 
354 	/* Change the attributes. */
355 
356 	iap->ia_valid |= ATTR_CTIME;
357 
358 	err = nfserr_notsync;
359 	if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
360 		fh_lock(fhp);
361 		host_err = notify_change(dentry, iap);
362 		err = nfserrno(host_err);
363 		fh_unlock(fhp);
364 	}
365 	if (size_change)
366 		put_write_access(inode);
367 	if (!err)
368 		if (EX_ISSYNC(fhp->fh_export))
369 			write_inode_now(inode, 1);
370 out:
371 	return err;
372 
373 out_nfserr:
374 	err = nfserrno(host_err);
375 	goto out;
376 }
377 
378 #if defined(CONFIG_NFSD_V2_ACL) || \
379     defined(CONFIG_NFSD_V3_ACL) || \
380     defined(CONFIG_NFSD_V4)
381 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
382 {
383 	ssize_t buflen;
384 
385 	buflen = vfs_getxattr(dentry, key, NULL, 0);
386 	if (buflen <= 0)
387 		return buflen;
388 
389 	*buf = kmalloc(buflen, GFP_KERNEL);
390 	if (!*buf)
391 		return -ENOMEM;
392 
393 	return vfs_getxattr(dentry, key, *buf, buflen);
394 }
395 #endif
396 
397 #if defined(CONFIG_NFSD_V4)
398 static int
399 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
400 {
401 	int len;
402 	size_t buflen;
403 	char *buf = NULL;
404 	int error = 0;
405 
406 	buflen = posix_acl_xattr_size(pacl->a_count);
407 	buf = kmalloc(buflen, GFP_KERNEL);
408 	error = -ENOMEM;
409 	if (buf == NULL)
410 		goto out;
411 
412 	len = posix_acl_to_xattr(pacl, buf, buflen);
413 	if (len < 0) {
414 		error = len;
415 		goto out;
416 	}
417 
418 	error = vfs_setxattr(dentry, key, buf, len, 0);
419 out:
420 	kfree(buf);
421 	return error;
422 }
423 
424 __be32
425 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
426     struct nfs4_acl *acl)
427 {
428 	__be32 error;
429 	int host_error;
430 	struct dentry *dentry;
431 	struct inode *inode;
432 	struct posix_acl *pacl = NULL, *dpacl = NULL;
433 	unsigned int flags = 0;
434 
435 	/* Get inode */
436 	error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
437 	if (error)
438 		goto out;
439 
440 	dentry = fhp->fh_dentry;
441 	inode = dentry->d_inode;
442 	if (S_ISDIR(inode->i_mode))
443 		flags = NFS4_ACL_DIR;
444 
445 	host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
446 	if (host_error == -EINVAL) {
447 		error = nfserr_attrnotsupp;
448 		goto out;
449 	} else if (host_error < 0)
450 		goto out_nfserr;
451 
452 	host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
453 	if (host_error < 0)
454 		goto out_nfserr;
455 
456 	if (S_ISDIR(inode->i_mode)) {
457 		host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
458 		if (host_error < 0)
459 			goto out_nfserr;
460 	}
461 
462 	error = nfs_ok;
463 
464 out:
465 	posix_acl_release(pacl);
466 	posix_acl_release(dpacl);
467 	return (error);
468 out_nfserr:
469 	if (host_error == -EOPNOTSUPP)
470 		error = nfserr_attrnotsupp;
471 	else
472 		error = nfserrno(host_error);
473 	goto out;
474 }
475 
476 static struct posix_acl *
477 _get_posix_acl(struct dentry *dentry, char *key)
478 {
479 	void *buf = NULL;
480 	struct posix_acl *pacl = NULL;
481 	int buflen;
482 
483 	buflen = nfsd_getxattr(dentry, key, &buf);
484 	if (!buflen)
485 		buflen = -ENODATA;
486 	if (buflen <= 0)
487 		return ERR_PTR(buflen);
488 
489 	pacl = posix_acl_from_xattr(buf, buflen);
490 	kfree(buf);
491 	return pacl;
492 }
493 
494 int
495 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
496 {
497 	struct inode *inode = dentry->d_inode;
498 	int error = 0;
499 	struct posix_acl *pacl = NULL, *dpacl = NULL;
500 	unsigned int flags = 0;
501 
502 	pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
503 	if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
504 		pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
505 	if (IS_ERR(pacl)) {
506 		error = PTR_ERR(pacl);
507 		pacl = NULL;
508 		goto out;
509 	}
510 
511 	if (S_ISDIR(inode->i_mode)) {
512 		dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
513 		if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
514 			dpacl = NULL;
515 		else if (IS_ERR(dpacl)) {
516 			error = PTR_ERR(dpacl);
517 			dpacl = NULL;
518 			goto out;
519 		}
520 		flags = NFS4_ACL_DIR;
521 	}
522 
523 	*acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
524 	if (IS_ERR(*acl)) {
525 		error = PTR_ERR(*acl);
526 		*acl = NULL;
527 	}
528  out:
529 	posix_acl_release(pacl);
530 	posix_acl_release(dpacl);
531 	return error;
532 }
533 
534 #endif /* defined(CONFIG_NFS_V4) */
535 
536 #ifdef CONFIG_NFSD_V3
537 /*
538  * Check server access rights to a file system object
539  */
540 struct accessmap {
541 	u32		access;
542 	int		how;
543 };
544 static struct accessmap	nfs3_regaccess[] = {
545     {	NFS3_ACCESS_READ,	MAY_READ			},
546     {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
547     {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_TRUNC		},
548     {	NFS3_ACCESS_EXTEND,	MAY_WRITE			},
549 
550     {	0,			0				}
551 };
552 
553 static struct accessmap	nfs3_diraccess[] = {
554     {	NFS3_ACCESS_READ,	MAY_READ			},
555     {	NFS3_ACCESS_LOOKUP,	MAY_EXEC			},
556     {	NFS3_ACCESS_MODIFY,	MAY_EXEC|MAY_WRITE|MAY_TRUNC	},
557     {	NFS3_ACCESS_EXTEND,	MAY_EXEC|MAY_WRITE		},
558     {	NFS3_ACCESS_DELETE,	MAY_REMOVE			},
559 
560     {	0,			0				}
561 };
562 
563 static struct accessmap	nfs3_anyaccess[] = {
564 	/* Some clients - Solaris 2.6 at least, make an access call
565 	 * to the server to check for access for things like /dev/null
566 	 * (which really, the server doesn't care about).  So
567 	 * We provide simple access checking for them, looking
568 	 * mainly at mode bits, and we make sure to ignore read-only
569 	 * filesystem checks
570 	 */
571     {	NFS3_ACCESS_READ,	MAY_READ			},
572     {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
573     {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_LOCAL_ACCESS	},
574     {	NFS3_ACCESS_EXTEND,	MAY_WRITE|MAY_LOCAL_ACCESS	},
575 
576     {	0,			0				}
577 };
578 
579 __be32
580 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
581 {
582 	struct accessmap	*map;
583 	struct svc_export	*export;
584 	struct dentry		*dentry;
585 	u32			query, result = 0, sresult = 0;
586 	__be32			error;
587 
588 	error = fh_verify(rqstp, fhp, 0, MAY_NOP);
589 	if (error)
590 		goto out;
591 
592 	export = fhp->fh_export;
593 	dentry = fhp->fh_dentry;
594 
595 	if (S_ISREG(dentry->d_inode->i_mode))
596 		map = nfs3_regaccess;
597 	else if (S_ISDIR(dentry->d_inode->i_mode))
598 		map = nfs3_diraccess;
599 	else
600 		map = nfs3_anyaccess;
601 
602 
603 	query = *access;
604 	for  (; map->access; map++) {
605 		if (map->access & query) {
606 			__be32 err2;
607 
608 			sresult |= map->access;
609 
610 			err2 = nfsd_permission(export, dentry, map->how);
611 			switch (err2) {
612 			case nfs_ok:
613 				result |= map->access;
614 				break;
615 
616 			/* the following error codes just mean the access was not allowed,
617 			 * rather than an error occurred */
618 			case nfserr_rofs:
619 			case nfserr_acces:
620 			case nfserr_perm:
621 				/* simply don't "or" in the access bit. */
622 				break;
623 			default:
624 				error = err2;
625 				goto out;
626 			}
627 		}
628 	}
629 	*access = result;
630 	if (supported)
631 		*supported = sresult;
632 
633  out:
634 	return error;
635 }
636 #endif /* CONFIG_NFSD_V3 */
637 
638 
639 
640 /*
641  * Open an existing file or directory.
642  * The access argument indicates the type of open (read/write/lock)
643  * N.B. After this call fhp needs an fh_put
644  */
645 __be32
646 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
647 			int access, struct file **filp)
648 {
649 	struct dentry	*dentry;
650 	struct inode	*inode;
651 	int		flags = O_RDONLY|O_LARGEFILE;
652 	__be32		err;
653 	int		host_err;
654 
655 	/*
656 	 * If we get here, then the client has already done an "open",
657 	 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
658 	 * in case a chmod has now revoked permission.
659 	 */
660 	err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
661 	if (err)
662 		goto out;
663 
664 	dentry = fhp->fh_dentry;
665 	inode = dentry->d_inode;
666 
667 	/* Disallow write access to files with the append-only bit set
668 	 * or any access when mandatory locking enabled
669 	 */
670 	err = nfserr_perm;
671 	if (IS_APPEND(inode) && (access & MAY_WRITE))
672 		goto out;
673 	if (IS_ISMNDLK(inode))
674 		goto out;
675 
676 	if (!inode->i_fop)
677 		goto out;
678 
679 	/*
680 	 * Check to see if there are any leases on this file.
681 	 * This may block while leases are broken.
682 	 */
683 	host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
684 	if (host_err == -EWOULDBLOCK)
685 		host_err = -ETIMEDOUT;
686 	if (host_err) /* NOMEM or WOULDBLOCK */
687 		goto out_nfserr;
688 
689 	if (access & MAY_WRITE) {
690 		if (access & MAY_READ)
691 			flags = O_RDWR|O_LARGEFILE;
692 		else
693 			flags = O_WRONLY|O_LARGEFILE;
694 
695 		DQUOT_INIT(inode);
696 	}
697 	*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
698 	if (IS_ERR(*filp))
699 		host_err = PTR_ERR(*filp);
700 out_nfserr:
701 	err = nfserrno(host_err);
702 out:
703 	return err;
704 }
705 
706 /*
707  * Close a file.
708  */
709 void
710 nfsd_close(struct file *filp)
711 {
712 	fput(filp);
713 }
714 
715 /*
716  * Sync a file
717  * As this calls fsync (not fdatasync) there is no need for a write_inode
718  * after it.
719  */
720 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
721 			      const struct file_operations *fop)
722 {
723 	struct inode *inode = dp->d_inode;
724 	int (*fsync) (struct file *, struct dentry *, int);
725 	int err;
726 
727 	err = filemap_fdatawrite(inode->i_mapping);
728 	if (err == 0 && fop && (fsync = fop->fsync))
729 		err = fsync(filp, dp, 0);
730 	if (err == 0)
731 		err = filemap_fdatawait(inode->i_mapping);
732 
733 	return err;
734 }
735 
736 
737 static int
738 nfsd_sync(struct file *filp)
739 {
740         int err;
741 	struct inode *inode = filp->f_path.dentry->d_inode;
742 	dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
743 	mutex_lock(&inode->i_mutex);
744 	err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
745 	mutex_unlock(&inode->i_mutex);
746 
747 	return err;
748 }
749 
750 int
751 nfsd_sync_dir(struct dentry *dp)
752 {
753 	return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
754 }
755 
756 /*
757  * Obtain the readahead parameters for the file
758  * specified by (dev, ino).
759  */
760 
761 static inline struct raparms *
762 nfsd_get_raparms(dev_t dev, ino_t ino)
763 {
764 	struct raparms	*ra, **rap, **frap = NULL;
765 	int depth = 0;
766 	unsigned int hash;
767 	struct raparm_hbucket *rab;
768 
769 	hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
770 	rab = &raparm_hash[hash];
771 
772 	spin_lock(&rab->pb_lock);
773 	for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
774 		if (ra->p_ino == ino && ra->p_dev == dev)
775 			goto found;
776 		depth++;
777 		if (ra->p_count == 0)
778 			frap = rap;
779 	}
780 	depth = nfsdstats.ra_size*11/10;
781 	if (!frap) {
782 		spin_unlock(&rab->pb_lock);
783 		return NULL;
784 	}
785 	rap = frap;
786 	ra = *frap;
787 	ra->p_dev = dev;
788 	ra->p_ino = ino;
789 	ra->p_set = 0;
790 	ra->p_hindex = hash;
791 found:
792 	if (rap != &rab->pb_head) {
793 		*rap = ra->p_next;
794 		ra->p_next   = rab->pb_head;
795 		rab->pb_head = ra;
796 	}
797 	ra->p_count++;
798 	nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
799 	spin_unlock(&rab->pb_lock);
800 	return ra;
801 }
802 
803 /*
804  * Grab and keep cached pages assosiated with a file in the svc_rqst
805  * so that they can be passed to the netowork sendmsg/sendpage routines
806  * directrly. They will be released after the sending has completed.
807  */
808 static int
809 nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
810 {
811 	unsigned long count = desc->count;
812 	struct svc_rqst *rqstp = desc->arg.data;
813 	struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
814 
815 	if (size > count)
816 		size = count;
817 
818 	if (rqstp->rq_res.page_len == 0) {
819 		get_page(page);
820 		put_page(*pp);
821 		*pp = page;
822 		rqstp->rq_resused++;
823 		rqstp->rq_res.page_base = offset;
824 		rqstp->rq_res.page_len = size;
825 	} else if (page != pp[-1]) {
826 		get_page(page);
827 		if (*pp)
828 			put_page(*pp);
829 		*pp = page;
830 		rqstp->rq_resused++;
831 		rqstp->rq_res.page_len += size;
832 	} else
833 		rqstp->rq_res.page_len += size;
834 
835 	desc->count = count - size;
836 	desc->written += size;
837 	return size;
838 }
839 
840 static __be32
841 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
842               loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
843 {
844 	struct inode *inode;
845 	struct raparms	*ra;
846 	mm_segment_t	oldfs;
847 	__be32		err;
848 	int		host_err;
849 
850 	err = nfserr_perm;
851 	inode = file->f_path.dentry->d_inode;
852 #ifdef MSNFS
853 	if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
854 		(!lock_may_read(inode, offset, *count)))
855 		goto out;
856 #endif
857 
858 	/* Get readahead parameters */
859 	ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
860 
861 	if (ra && ra->p_set)
862 		file->f_ra = ra->p_ra;
863 
864 	if (file->f_op->sendfile && rqstp->rq_sendfile_ok) {
865 		rqstp->rq_resused = 1;
866 		host_err = file->f_op->sendfile(file, &offset, *count,
867 						 nfsd_read_actor, rqstp);
868 	} else {
869 		oldfs = get_fs();
870 		set_fs(KERNEL_DS);
871 		host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
872 		set_fs(oldfs);
873 	}
874 
875 	/* Write back readahead params */
876 	if (ra) {
877 		struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
878 		spin_lock(&rab->pb_lock);
879 		ra->p_ra = file->f_ra;
880 		ra->p_set = 1;
881 		ra->p_count--;
882 		spin_unlock(&rab->pb_lock);
883 	}
884 
885 	if (host_err >= 0) {
886 		nfsdstats.io_read += host_err;
887 		*count = host_err;
888 		err = 0;
889 		fsnotify_access(file->f_path.dentry);
890 	} else
891 		err = nfserrno(host_err);
892 out:
893 	return err;
894 }
895 
896 static void kill_suid(struct dentry *dentry)
897 {
898 	struct iattr	ia;
899 	ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
900 
901 	mutex_lock(&dentry->d_inode->i_mutex);
902 	notify_change(dentry, &ia);
903 	mutex_unlock(&dentry->d_inode->i_mutex);
904 }
905 
906 static __be32
907 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
908 				loff_t offset, struct kvec *vec, int vlen,
909 	   			unsigned long cnt, int *stablep)
910 {
911 	struct svc_export	*exp;
912 	struct dentry		*dentry;
913 	struct inode		*inode;
914 	mm_segment_t		oldfs;
915 	__be32			err = 0;
916 	int			host_err;
917 	int			stable = *stablep;
918 
919 #ifdef MSNFS
920 	err = nfserr_perm;
921 
922 	if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
923 		(!lock_may_write(file->f_path.dentry->d_inode, offset, cnt)))
924 		goto out;
925 #endif
926 
927 	dentry = file->f_path.dentry;
928 	inode = dentry->d_inode;
929 	exp   = fhp->fh_export;
930 
931 	/*
932 	 * Request sync writes if
933 	 *  -	the sync export option has been set, or
934 	 *  -	the client requested O_SYNC behavior (NFSv3 feature).
935 	 *  -   The file system doesn't support fsync().
936 	 * When gathered writes have been configured for this volume,
937 	 * flushing the data to disk is handled separately below.
938 	 */
939 
940 	if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
941 	       stable = 2;
942 	       *stablep = 2; /* FILE_SYNC */
943 	}
944 
945 	if (!EX_ISSYNC(exp))
946 		stable = 0;
947 	if (stable && !EX_WGATHER(exp))
948 		file->f_flags |= O_SYNC;
949 
950 	/* Write the data. */
951 	oldfs = get_fs(); set_fs(KERNEL_DS);
952 	host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
953 	set_fs(oldfs);
954 	if (host_err >= 0) {
955 		nfsdstats.io_write += cnt;
956 		fsnotify_modify(file->f_path.dentry);
957 	}
958 
959 	/* clear setuid/setgid flag after write */
960 	if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
961 		kill_suid(dentry);
962 
963 	if (host_err >= 0 && stable) {
964 		static ino_t	last_ino;
965 		static dev_t	last_dev;
966 
967 		/*
968 		 * Gathered writes: If another process is currently
969 		 * writing to the file, there's a high chance
970 		 * this is another nfsd (triggered by a bulk write
971 		 * from a client's biod). Rather than syncing the
972 		 * file with each write request, we sleep for 10 msec.
973 		 *
974 		 * I don't know if this roughly approximates
975 		 * C. Juszak's idea of gathered writes, but it's a
976 		 * nice and simple solution (IMHO), and it seems to
977 		 * work:-)
978 		 */
979 		if (EX_WGATHER(exp)) {
980 			if (atomic_read(&inode->i_writecount) > 1
981 			    || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
982 				dprintk("nfsd: write defer %d\n", current->pid);
983 				msleep(10);
984 				dprintk("nfsd: write resume %d\n", current->pid);
985 			}
986 
987 			if (inode->i_state & I_DIRTY) {
988 				dprintk("nfsd: write sync %d\n", current->pid);
989 				host_err=nfsd_sync(file);
990 			}
991 #if 0
992 			wake_up(&inode->i_wait);
993 #endif
994 		}
995 		last_ino = inode->i_ino;
996 		last_dev = inode->i_sb->s_dev;
997 	}
998 
999 	dprintk("nfsd: write complete host_err=%d\n", host_err);
1000 	if (host_err >= 0)
1001 		err = 0;
1002 	else
1003 		err = nfserrno(host_err);
1004 out:
1005 	return err;
1006 }
1007 
1008 /*
1009  * Read data from a file. count must contain the requested read count
1010  * on entry. On return, *count contains the number of bytes actually read.
1011  * N.B. After this call fhp needs an fh_put
1012  */
1013 __be32
1014 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1015 		loff_t offset, struct kvec *vec, int vlen,
1016 		unsigned long *count)
1017 {
1018 	__be32		err;
1019 
1020 	if (file) {
1021 		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1022 				MAY_READ|MAY_OWNER_OVERRIDE);
1023 		if (err)
1024 			goto out;
1025 		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1026 	} else {
1027 		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
1028 		if (err)
1029 			goto out;
1030 		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1031 		nfsd_close(file);
1032 	}
1033 out:
1034 	return err;
1035 }
1036 
1037 /*
1038  * Write data to a file.
1039  * The stable flag requests synchronous writes.
1040  * N.B. After this call fhp needs an fh_put
1041  */
1042 __be32
1043 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1044 		loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1045 		int *stablep)
1046 {
1047 	__be32			err = 0;
1048 
1049 	if (file) {
1050 		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1051 				MAY_WRITE|MAY_OWNER_OVERRIDE);
1052 		if (err)
1053 			goto out;
1054 		err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1055 				stablep);
1056 	} else {
1057 		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1058 		if (err)
1059 			goto out;
1060 
1061 		if (cnt)
1062 			err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1063 					     cnt, stablep);
1064 		nfsd_close(file);
1065 	}
1066 out:
1067 	return err;
1068 }
1069 
1070 #ifdef CONFIG_NFSD_V3
1071 /*
1072  * Commit all pending writes to stable storage.
1073  * Strictly speaking, we could sync just the indicated file region here,
1074  * but there's currently no way we can ask the VFS to do so.
1075  *
1076  * Unfortunately we cannot lock the file to make sure we return full WCC
1077  * data to the client, as locking happens lower down in the filesystem.
1078  */
1079 __be32
1080 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1081                loff_t offset, unsigned long count)
1082 {
1083 	struct file	*file;
1084 	__be32		err;
1085 
1086 	if ((u64)count > ~(u64)offset)
1087 		return nfserr_inval;
1088 
1089 	if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1090 		return err;
1091 	if (EX_ISSYNC(fhp->fh_export)) {
1092 		if (file->f_op && file->f_op->fsync) {
1093 			err = nfserrno(nfsd_sync(file));
1094 		} else {
1095 			err = nfserr_notsupp;
1096 		}
1097 	}
1098 
1099 	nfsd_close(file);
1100 	return err;
1101 }
1102 #endif /* CONFIG_NFSD_V3 */
1103 
1104 /*
1105  * Create a file (regular, directory, device, fifo); UNIX sockets
1106  * not yet implemented.
1107  * If the response fh has been verified, the parent directory should
1108  * already be locked. Note that the parent directory is left locked.
1109  *
1110  * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1111  */
1112 __be32
1113 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1114 		char *fname, int flen, struct iattr *iap,
1115 		int type, dev_t rdev, struct svc_fh *resfhp)
1116 {
1117 	struct dentry	*dentry, *dchild = NULL;
1118 	struct inode	*dirp;
1119 	__be32		err;
1120 	int		host_err;
1121 
1122 	err = nfserr_perm;
1123 	if (!flen)
1124 		goto out;
1125 	err = nfserr_exist;
1126 	if (isdotent(fname, flen))
1127 		goto out;
1128 
1129 	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1130 	if (err)
1131 		goto out;
1132 
1133 	dentry = fhp->fh_dentry;
1134 	dirp = dentry->d_inode;
1135 
1136 	err = nfserr_notdir;
1137 	if(!dirp->i_op || !dirp->i_op->lookup)
1138 		goto out;
1139 	/*
1140 	 * Check whether the response file handle has been verified yet.
1141 	 * If it has, the parent directory should already be locked.
1142 	 */
1143 	if (!resfhp->fh_dentry) {
1144 		/* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1145 		fh_lock_nested(fhp, I_MUTEX_PARENT);
1146 		dchild = lookup_one_len(fname, dentry, flen);
1147 		host_err = PTR_ERR(dchild);
1148 		if (IS_ERR(dchild))
1149 			goto out_nfserr;
1150 		err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1151 		if (err)
1152 			goto out;
1153 	} else {
1154 		/* called from nfsd_proc_create */
1155 		dchild = dget(resfhp->fh_dentry);
1156 		if (!fhp->fh_locked) {
1157 			/* not actually possible */
1158 			printk(KERN_ERR
1159 				"nfsd_create: parent %s/%s not locked!\n",
1160 				dentry->d_parent->d_name.name,
1161 				dentry->d_name.name);
1162 			err = nfserr_io;
1163 			goto out;
1164 		}
1165 	}
1166 	/*
1167 	 * Make sure the child dentry is still negative ...
1168 	 */
1169 	err = nfserr_exist;
1170 	if (dchild->d_inode) {
1171 		dprintk("nfsd_create: dentry %s/%s not negative!\n",
1172 			dentry->d_name.name, dchild->d_name.name);
1173 		goto out;
1174 	}
1175 
1176 	if (!(iap->ia_valid & ATTR_MODE))
1177 		iap->ia_mode = 0;
1178 	iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1179 
1180 	/*
1181 	 * Get the dir op function pointer.
1182 	 */
1183 	err = 0;
1184 	switch (type) {
1185 	case S_IFREG:
1186 		host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1187 		break;
1188 	case S_IFDIR:
1189 		host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1190 		break;
1191 	case S_IFCHR:
1192 	case S_IFBLK:
1193 	case S_IFIFO:
1194 	case S_IFSOCK:
1195 		host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1196 		break;
1197 	default:
1198 	        printk("nfsd: bad file type %o in nfsd_create\n", type);
1199 		host_err = -EINVAL;
1200 	}
1201 	if (host_err < 0)
1202 		goto out_nfserr;
1203 
1204 	if (EX_ISSYNC(fhp->fh_export)) {
1205 		err = nfserrno(nfsd_sync_dir(dentry));
1206 		write_inode_now(dchild->d_inode, 1);
1207 	}
1208 
1209 
1210 	/* Set file attributes. Mode has already been set and
1211 	 * setting uid/gid works only for root. Irix appears to
1212 	 * send along the gid when it tries to implement setgid
1213 	 * directories via NFS.
1214 	 */
1215 	if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1216 		__be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1217 		if (err2)
1218 			err = err2;
1219 	}
1220 	/*
1221 	 * Update the file handle to get the new inode info.
1222 	 */
1223 	if (!err)
1224 		err = fh_update(resfhp);
1225 out:
1226 	if (dchild && !IS_ERR(dchild))
1227 		dput(dchild);
1228 	return err;
1229 
1230 out_nfserr:
1231 	err = nfserrno(host_err);
1232 	goto out;
1233 }
1234 
1235 #ifdef CONFIG_NFSD_V3
1236 /*
1237  * NFSv3 version of nfsd_create
1238  */
1239 __be32
1240 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1241 		char *fname, int flen, struct iattr *iap,
1242 		struct svc_fh *resfhp, int createmode, u32 *verifier,
1243 	        int *truncp, int *created)
1244 {
1245 	struct dentry	*dentry, *dchild = NULL;
1246 	struct inode	*dirp;
1247 	__be32		err;
1248 	int		host_err;
1249 	__u32		v_mtime=0, v_atime=0;
1250 
1251 	err = nfserr_perm;
1252 	if (!flen)
1253 		goto out;
1254 	err = nfserr_exist;
1255 	if (isdotent(fname, flen))
1256 		goto out;
1257 	if (!(iap->ia_valid & ATTR_MODE))
1258 		iap->ia_mode = 0;
1259 	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1260 	if (err)
1261 		goto out;
1262 
1263 	dentry = fhp->fh_dentry;
1264 	dirp = dentry->d_inode;
1265 
1266 	/* Get all the sanity checks out of the way before
1267 	 * we lock the parent. */
1268 	err = nfserr_notdir;
1269 	if(!dirp->i_op || !dirp->i_op->lookup)
1270 		goto out;
1271 	fh_lock_nested(fhp, I_MUTEX_PARENT);
1272 
1273 	/*
1274 	 * Compose the response file handle.
1275 	 */
1276 	dchild = lookup_one_len(fname, dentry, flen);
1277 	host_err = PTR_ERR(dchild);
1278 	if (IS_ERR(dchild))
1279 		goto out_nfserr;
1280 
1281 	err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1282 	if (err)
1283 		goto out;
1284 
1285 	if (createmode == NFS3_CREATE_EXCLUSIVE) {
1286 		/* solaris7 gets confused (bugid 4218508) if these have
1287 		 * the high bit set, so just clear the high bits.
1288 		 */
1289 		v_mtime = verifier[0]&0x7fffffff;
1290 		v_atime = verifier[1]&0x7fffffff;
1291 	}
1292 
1293 	if (dchild->d_inode) {
1294 		err = 0;
1295 
1296 		switch (createmode) {
1297 		case NFS3_CREATE_UNCHECKED:
1298 			if (! S_ISREG(dchild->d_inode->i_mode))
1299 				err = nfserr_exist;
1300 			else if (truncp) {
1301 				/* in nfsv4, we need to treat this case a little
1302 				 * differently.  we don't want to truncate the
1303 				 * file now; this would be wrong if the OPEN
1304 				 * fails for some other reason.  furthermore,
1305 				 * if the size is nonzero, we should ignore it
1306 				 * according to spec!
1307 				 */
1308 				*truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1309 			}
1310 			else {
1311 				iap->ia_valid &= ATTR_SIZE;
1312 				goto set_attr;
1313 			}
1314 			break;
1315 		case NFS3_CREATE_EXCLUSIVE:
1316 			if (   dchild->d_inode->i_mtime.tv_sec == v_mtime
1317 			    && dchild->d_inode->i_atime.tv_sec == v_atime
1318 			    && dchild->d_inode->i_size  == 0 )
1319 				break;
1320 			 /* fallthru */
1321 		case NFS3_CREATE_GUARDED:
1322 			err = nfserr_exist;
1323 		}
1324 		goto out;
1325 	}
1326 
1327 	host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1328 	if (host_err < 0)
1329 		goto out_nfserr;
1330 	if (created)
1331 		*created = 1;
1332 
1333 	if (EX_ISSYNC(fhp->fh_export)) {
1334 		err = nfserrno(nfsd_sync_dir(dentry));
1335 		/* setattr will sync the child (or not) */
1336 	}
1337 
1338 	if (createmode == NFS3_CREATE_EXCLUSIVE) {
1339 		/* Cram the verifier into atime/mtime */
1340 		iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1341 			| ATTR_MTIME_SET|ATTR_ATIME_SET;
1342 		/* XXX someone who knows this better please fix it for nsec */
1343 		iap->ia_mtime.tv_sec = v_mtime;
1344 		iap->ia_atime.tv_sec = v_atime;
1345 		iap->ia_mtime.tv_nsec = 0;
1346 		iap->ia_atime.tv_nsec = 0;
1347 	}
1348 
1349 	/* Set file attributes.
1350 	 * Irix appears to send along the gid when it tries to
1351 	 * implement setgid directories via NFS. Clear out all that cruft.
1352 	 */
1353  set_attr:
1354 	if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1355  		__be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1356 		if (err2)
1357 			err = err2;
1358 	}
1359 
1360 	/*
1361 	 * Update the filehandle to get the new inode info.
1362 	 */
1363 	if (!err)
1364 		err = fh_update(resfhp);
1365 
1366  out:
1367 	fh_unlock(fhp);
1368 	if (dchild && !IS_ERR(dchild))
1369 		dput(dchild);
1370  	return err;
1371 
1372  out_nfserr:
1373 	err = nfserrno(host_err);
1374 	goto out;
1375 }
1376 #endif /* CONFIG_NFSD_V3 */
1377 
1378 /*
1379  * Read a symlink. On entry, *lenp must contain the maximum path length that
1380  * fits into the buffer. On return, it contains the true length.
1381  * N.B. After this call fhp needs an fh_put
1382  */
1383 __be32
1384 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1385 {
1386 	struct dentry	*dentry;
1387 	struct inode	*inode;
1388 	mm_segment_t	oldfs;
1389 	__be32		err;
1390 	int		host_err;
1391 
1392 	err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1393 	if (err)
1394 		goto out;
1395 
1396 	dentry = fhp->fh_dentry;
1397 	inode = dentry->d_inode;
1398 
1399 	err = nfserr_inval;
1400 	if (!inode->i_op || !inode->i_op->readlink)
1401 		goto out;
1402 
1403 	touch_atime(fhp->fh_export->ex_mnt, dentry);
1404 	/* N.B. Why does this call need a get_fs()??
1405 	 * Remove the set_fs and watch the fireworks:-) --okir
1406 	 */
1407 
1408 	oldfs = get_fs(); set_fs(KERNEL_DS);
1409 	host_err = inode->i_op->readlink(dentry, buf, *lenp);
1410 	set_fs(oldfs);
1411 
1412 	if (host_err < 0)
1413 		goto out_nfserr;
1414 	*lenp = host_err;
1415 	err = 0;
1416 out:
1417 	return err;
1418 
1419 out_nfserr:
1420 	err = nfserrno(host_err);
1421 	goto out;
1422 }
1423 
1424 /*
1425  * Create a symlink and look up its inode
1426  * N.B. After this call _both_ fhp and resfhp need an fh_put
1427  */
1428 __be32
1429 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1430 				char *fname, int flen,
1431 				char *path,  int plen,
1432 				struct svc_fh *resfhp,
1433 				struct iattr *iap)
1434 {
1435 	struct dentry	*dentry, *dnew;
1436 	__be32		err, cerr;
1437 	int		host_err;
1438 	umode_t		mode;
1439 
1440 	err = nfserr_noent;
1441 	if (!flen || !plen)
1442 		goto out;
1443 	err = nfserr_exist;
1444 	if (isdotent(fname, flen))
1445 		goto out;
1446 
1447 	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1448 	if (err)
1449 		goto out;
1450 	fh_lock(fhp);
1451 	dentry = fhp->fh_dentry;
1452 	dnew = lookup_one_len(fname, dentry, flen);
1453 	host_err = PTR_ERR(dnew);
1454 	if (IS_ERR(dnew))
1455 		goto out_nfserr;
1456 
1457 	mode = S_IALLUGO;
1458 	/* Only the MODE ATTRibute is even vaguely meaningful */
1459 	if (iap && (iap->ia_valid & ATTR_MODE))
1460 		mode = iap->ia_mode & S_IALLUGO;
1461 
1462 	if (unlikely(path[plen] != 0)) {
1463 		char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1464 		if (path_alloced == NULL)
1465 			host_err = -ENOMEM;
1466 		else {
1467 			strncpy(path_alloced, path, plen);
1468 			path_alloced[plen] = 0;
1469 			host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1470 			kfree(path_alloced);
1471 		}
1472 	} else
1473 		host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1474 
1475 	if (!host_err) {
1476 		if (EX_ISSYNC(fhp->fh_export))
1477 			host_err = nfsd_sync_dir(dentry);
1478 	}
1479 	err = nfserrno(host_err);
1480 	fh_unlock(fhp);
1481 
1482 	cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1483 	dput(dnew);
1484 	if (err==0) err = cerr;
1485 out:
1486 	return err;
1487 
1488 out_nfserr:
1489 	err = nfserrno(host_err);
1490 	goto out;
1491 }
1492 
1493 /*
1494  * Create a hardlink
1495  * N.B. After this call _both_ ffhp and tfhp need an fh_put
1496  */
1497 __be32
1498 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1499 				char *name, int len, struct svc_fh *tfhp)
1500 {
1501 	struct dentry	*ddir, *dnew, *dold;
1502 	struct inode	*dirp, *dest;
1503 	__be32		err;
1504 	int		host_err;
1505 
1506 	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1507 	if (err)
1508 		goto out;
1509 	err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1510 	if (err)
1511 		goto out;
1512 
1513 	err = nfserr_perm;
1514 	if (!len)
1515 		goto out;
1516 	err = nfserr_exist;
1517 	if (isdotent(name, len))
1518 		goto out;
1519 
1520 	fh_lock_nested(ffhp, I_MUTEX_PARENT);
1521 	ddir = ffhp->fh_dentry;
1522 	dirp = ddir->d_inode;
1523 
1524 	dnew = lookup_one_len(name, ddir, len);
1525 	host_err = PTR_ERR(dnew);
1526 	if (IS_ERR(dnew))
1527 		goto out_nfserr;
1528 
1529 	dold = tfhp->fh_dentry;
1530 	dest = dold->d_inode;
1531 
1532 	host_err = vfs_link(dold, dirp, dnew);
1533 	if (!host_err) {
1534 		if (EX_ISSYNC(ffhp->fh_export)) {
1535 			err = nfserrno(nfsd_sync_dir(ddir));
1536 			write_inode_now(dest, 1);
1537 		}
1538 		err = 0;
1539 	} else {
1540 		if (host_err == -EXDEV && rqstp->rq_vers == 2)
1541 			err = nfserr_acces;
1542 		else
1543 			err = nfserrno(host_err);
1544 	}
1545 
1546 	dput(dnew);
1547 out_unlock:
1548 	fh_unlock(ffhp);
1549 out:
1550 	return err;
1551 
1552 out_nfserr:
1553 	err = nfserrno(host_err);
1554 	goto out_unlock;
1555 }
1556 
1557 /*
1558  * Rename a file
1559  * N.B. After this call _both_ ffhp and tfhp need an fh_put
1560  */
1561 __be32
1562 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1563 			    struct svc_fh *tfhp, char *tname, int tlen)
1564 {
1565 	struct dentry	*fdentry, *tdentry, *odentry, *ndentry, *trap;
1566 	struct inode	*fdir, *tdir;
1567 	__be32		err;
1568 	int		host_err;
1569 
1570 	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1571 	if (err)
1572 		goto out;
1573 	err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1574 	if (err)
1575 		goto out;
1576 
1577 	fdentry = ffhp->fh_dentry;
1578 	fdir = fdentry->d_inode;
1579 
1580 	tdentry = tfhp->fh_dentry;
1581 	tdir = tdentry->d_inode;
1582 
1583 	err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1584 	if (ffhp->fh_export != tfhp->fh_export)
1585 		goto out;
1586 
1587 	err = nfserr_perm;
1588 	if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1589 		goto out;
1590 
1591 	/* cannot use fh_lock as we need deadlock protective ordering
1592 	 * so do it by hand */
1593 	trap = lock_rename(tdentry, fdentry);
1594 	ffhp->fh_locked = tfhp->fh_locked = 1;
1595 	fill_pre_wcc(ffhp);
1596 	fill_pre_wcc(tfhp);
1597 
1598 	odentry = lookup_one_len(fname, fdentry, flen);
1599 	host_err = PTR_ERR(odentry);
1600 	if (IS_ERR(odentry))
1601 		goto out_nfserr;
1602 
1603 	host_err = -ENOENT;
1604 	if (!odentry->d_inode)
1605 		goto out_dput_old;
1606 	host_err = -EINVAL;
1607 	if (odentry == trap)
1608 		goto out_dput_old;
1609 
1610 	ndentry = lookup_one_len(tname, tdentry, tlen);
1611 	host_err = PTR_ERR(ndentry);
1612 	if (IS_ERR(ndentry))
1613 		goto out_dput_old;
1614 	host_err = -ENOTEMPTY;
1615 	if (ndentry == trap)
1616 		goto out_dput_new;
1617 
1618 #ifdef MSNFS
1619 	if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1620 		((atomic_read(&odentry->d_count) > 1)
1621 		 || (atomic_read(&ndentry->d_count) > 1))) {
1622 			host_err = -EPERM;
1623 	} else
1624 #endif
1625 	host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1626 	if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1627 		host_err = nfsd_sync_dir(tdentry);
1628 		if (!host_err)
1629 			host_err = nfsd_sync_dir(fdentry);
1630 	}
1631 
1632  out_dput_new:
1633 	dput(ndentry);
1634  out_dput_old:
1635 	dput(odentry);
1636  out_nfserr:
1637 	err = nfserrno(host_err);
1638 
1639 	/* we cannot reply on fh_unlock on the two filehandles,
1640 	 * as that would do the wrong thing if the two directories
1641 	 * were the same, so again we do it by hand
1642 	 */
1643 	fill_post_wcc(ffhp);
1644 	fill_post_wcc(tfhp);
1645 	unlock_rename(tdentry, fdentry);
1646 	ffhp->fh_locked = tfhp->fh_locked = 0;
1647 
1648 out:
1649 	return err;
1650 }
1651 
1652 /*
1653  * Unlink a file or directory
1654  * N.B. After this call fhp needs an fh_put
1655  */
1656 __be32
1657 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1658 				char *fname, int flen)
1659 {
1660 	struct dentry	*dentry, *rdentry;
1661 	struct inode	*dirp;
1662 	__be32		err;
1663 	int		host_err;
1664 
1665 	err = nfserr_acces;
1666 	if (!flen || isdotent(fname, flen))
1667 		goto out;
1668 	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1669 	if (err)
1670 		goto out;
1671 
1672 	fh_lock_nested(fhp, I_MUTEX_PARENT);
1673 	dentry = fhp->fh_dentry;
1674 	dirp = dentry->d_inode;
1675 
1676 	rdentry = lookup_one_len(fname, dentry, flen);
1677 	host_err = PTR_ERR(rdentry);
1678 	if (IS_ERR(rdentry))
1679 		goto out_nfserr;
1680 
1681 	if (!rdentry->d_inode) {
1682 		dput(rdentry);
1683 		err = nfserr_noent;
1684 		goto out;
1685 	}
1686 
1687 	if (!type)
1688 		type = rdentry->d_inode->i_mode & S_IFMT;
1689 
1690 	if (type != S_IFDIR) { /* It's UNLINK */
1691 #ifdef MSNFS
1692 		if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1693 			(atomic_read(&rdentry->d_count) > 1)) {
1694 			host_err = -EPERM;
1695 		} else
1696 #endif
1697 		host_err = vfs_unlink(dirp, rdentry);
1698 	} else { /* It's RMDIR */
1699 		host_err = vfs_rmdir(dirp, rdentry);
1700 	}
1701 
1702 	dput(rdentry);
1703 
1704 	if (host_err)
1705 		goto out_nfserr;
1706 	if (EX_ISSYNC(fhp->fh_export))
1707 		host_err = nfsd_sync_dir(dentry);
1708 
1709 out_nfserr:
1710 	err = nfserrno(host_err);
1711 out:
1712 	return err;
1713 }
1714 
1715 /*
1716  * Read entries from a directory.
1717  * The  NFSv3/4 verifier we ignore for now.
1718  */
1719 __be32
1720 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1721 	     struct readdir_cd *cdp, filldir_t func)
1722 {
1723 	__be32		err;
1724 	int 		host_err;
1725 	struct file	*file;
1726 	loff_t		offset = *offsetp;
1727 
1728 	err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1729 	if (err)
1730 		goto out;
1731 
1732 	offset = vfs_llseek(file, offset, 0);
1733 	if (offset < 0) {
1734 		err = nfserrno((int)offset);
1735 		goto out_close;
1736 	}
1737 
1738 	/*
1739 	 * Read the directory entries. This silly loop is necessary because
1740 	 * readdir() is not guaranteed to fill up the entire buffer, but
1741 	 * may choose to do less.
1742 	 */
1743 
1744 	do {
1745 		cdp->err = nfserr_eof; /* will be cleared on successful read */
1746 		host_err = vfs_readdir(file, func, cdp);
1747 	} while (host_err >=0 && cdp->err == nfs_ok);
1748 	if (host_err)
1749 		err = nfserrno(host_err);
1750 	else
1751 		err = cdp->err;
1752 	*offsetp = vfs_llseek(file, 0, 1);
1753 
1754 	if (err == nfserr_eof || err == nfserr_toosmall)
1755 		err = nfs_ok; /* can still be found in ->err */
1756 out_close:
1757 	nfsd_close(file);
1758 out:
1759 	return err;
1760 }
1761 
1762 /*
1763  * Get file system stats
1764  * N.B. After this call fhp needs an fh_put
1765  */
1766 __be32
1767 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1768 {
1769 	__be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1770 	if (!err && vfs_statfs(fhp->fh_dentry,stat))
1771 		err = nfserr_io;
1772 	return err;
1773 }
1774 
1775 /*
1776  * Check for a user's access permissions to this inode.
1777  */
1778 __be32
1779 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1780 {
1781 	struct inode	*inode = dentry->d_inode;
1782 	int		err;
1783 
1784 	if (acc == MAY_NOP)
1785 		return 0;
1786 #if 0
1787 	dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1788 		acc,
1789 		(acc & MAY_READ)?	" read"  : "",
1790 		(acc & MAY_WRITE)?	" write" : "",
1791 		(acc & MAY_EXEC)?	" exec"  : "",
1792 		(acc & MAY_SATTR)?	" sattr" : "",
1793 		(acc & MAY_TRUNC)?	" trunc" : "",
1794 		(acc & MAY_LOCK)?	" lock"  : "",
1795 		(acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1796 		inode->i_mode,
1797 		IS_IMMUTABLE(inode)?	" immut" : "",
1798 		IS_APPEND(inode)?	" append" : "",
1799 		IS_RDONLY(inode)?	" ro" : "");
1800 	dprintk("      owner %d/%d user %d/%d\n",
1801 		inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1802 #endif
1803 
1804 	/* Normally we reject any write/sattr etc access on a read-only file
1805 	 * system.  But if it is IRIX doing check on write-access for a
1806 	 * device special file, we ignore rofs.
1807 	 */
1808 	if (!(acc & MAY_LOCAL_ACCESS))
1809 		if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1810 			if (EX_RDONLY(exp) || IS_RDONLY(inode))
1811 				return nfserr_rofs;
1812 			if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1813 				return nfserr_perm;
1814 		}
1815 	if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1816 		return nfserr_perm;
1817 
1818 	if (acc & MAY_LOCK) {
1819 		/* If we cannot rely on authentication in NLM requests,
1820 		 * just allow locks, otherwise require read permission, or
1821 		 * ownership
1822 		 */
1823 		if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1824 			return 0;
1825 		else
1826 			acc = MAY_READ | MAY_OWNER_OVERRIDE;
1827 	}
1828 	/*
1829 	 * The file owner always gets access permission for accesses that
1830 	 * would normally be checked at open time. This is to make
1831 	 * file access work even when the client has done a fchmod(fd, 0).
1832 	 *
1833 	 * However, `cp foo bar' should fail nevertheless when bar is
1834 	 * readonly. A sensible way to do this might be to reject all
1835 	 * attempts to truncate a read-only file, because a creat() call
1836 	 * always implies file truncation.
1837 	 * ... but this isn't really fair.  A process may reasonably call
1838 	 * ftruncate on an open file descriptor on a file with perm 000.
1839 	 * We must trust the client to do permission checking - using "ACCESS"
1840 	 * with NFSv3.
1841 	 */
1842 	if ((acc & MAY_OWNER_OVERRIDE) &&
1843 	    inode->i_uid == current->fsuid)
1844 		return 0;
1845 
1846 	err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1847 
1848 	/* Allow read access to binaries even when mode 111 */
1849 	if (err == -EACCES && S_ISREG(inode->i_mode) &&
1850 	    acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1851 		err = permission(inode, MAY_EXEC, NULL);
1852 
1853 	return err? nfserrno(err) : 0;
1854 }
1855 
1856 void
1857 nfsd_racache_shutdown(void)
1858 {
1859 	if (!raparml)
1860 		return;
1861 	dprintk("nfsd: freeing readahead buffers.\n");
1862 	kfree(raparml);
1863 	raparml = NULL;
1864 }
1865 /*
1866  * Initialize readahead param cache
1867  */
1868 int
1869 nfsd_racache_init(int cache_size)
1870 {
1871 	int	i;
1872 	int	j = 0;
1873 	int	nperbucket;
1874 
1875 
1876 	if (raparml)
1877 		return 0;
1878 	if (cache_size < 2*RAPARM_HASH_SIZE)
1879 		cache_size = 2*RAPARM_HASH_SIZE;
1880 	raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL);
1881 
1882 	if (!raparml) {
1883 		printk(KERN_WARNING
1884 			"nfsd: Could not allocate memory read-ahead cache.\n");
1885 		return -ENOMEM;
1886 	}
1887 
1888 	dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
1889 	for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) {
1890 		raparm_hash[i].pb_head = NULL;
1891 		spin_lock_init(&raparm_hash[i].pb_lock);
1892 	}
1893 	nperbucket = cache_size >> RAPARM_HASH_BITS;
1894 	for (i = 0; i < cache_size - 1; i++) {
1895 		if (i % nperbucket == 0)
1896 			raparm_hash[j++].pb_head = raparml + i;
1897 		if (i % nperbucket < nperbucket-1)
1898 			raparml[i].p_next = raparml + i + 1;
1899 	}
1900 
1901 	nfsdstats.ra_size = cache_size;
1902 	return 0;
1903 }
1904 
1905 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1906 struct posix_acl *
1907 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1908 {
1909 	struct inode *inode = fhp->fh_dentry->d_inode;
1910 	char *name;
1911 	void *value = NULL;
1912 	ssize_t size;
1913 	struct posix_acl *acl;
1914 
1915 	if (!IS_POSIXACL(inode))
1916 		return ERR_PTR(-EOPNOTSUPP);
1917 
1918 	switch (type) {
1919 	case ACL_TYPE_ACCESS:
1920 		name = POSIX_ACL_XATTR_ACCESS;
1921 		break;
1922 	case ACL_TYPE_DEFAULT:
1923 		name = POSIX_ACL_XATTR_DEFAULT;
1924 		break;
1925 	default:
1926 		return ERR_PTR(-EOPNOTSUPP);
1927 	}
1928 
1929 	size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1930 	if (size < 0)
1931 		return ERR_PTR(size);
1932 
1933 	acl = posix_acl_from_xattr(value, size);
1934 	kfree(value);
1935 	return acl;
1936 }
1937 
1938 int
1939 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1940 {
1941 	struct inode *inode = fhp->fh_dentry->d_inode;
1942 	char *name;
1943 	void *value = NULL;
1944 	size_t size;
1945 	int error;
1946 
1947 	if (!IS_POSIXACL(inode) || !inode->i_op ||
1948 	    !inode->i_op->setxattr || !inode->i_op->removexattr)
1949 		return -EOPNOTSUPP;
1950 	switch(type) {
1951 		case ACL_TYPE_ACCESS:
1952 			name = POSIX_ACL_XATTR_ACCESS;
1953 			break;
1954 		case ACL_TYPE_DEFAULT:
1955 			name = POSIX_ACL_XATTR_DEFAULT;
1956 			break;
1957 		default:
1958 			return -EOPNOTSUPP;
1959 	}
1960 
1961 	if (acl && acl->a_count) {
1962 		size = posix_acl_xattr_size(acl->a_count);
1963 		value = kmalloc(size, GFP_KERNEL);
1964 		if (!value)
1965 			return -ENOMEM;
1966 		error = posix_acl_to_xattr(acl, value, size);
1967 		if (error < 0)
1968 			goto getout;
1969 		size = error;
1970 	} else
1971 		size = 0;
1972 
1973 	if (size)
1974 		error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1975 	else {
1976 		if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1977 			error = 0;
1978 		else {
1979 			error = vfs_removexattr(fhp->fh_dentry, name);
1980 			if (error == -ENODATA)
1981 				error = 0;
1982 		}
1983 	}
1984 
1985 getout:
1986 	kfree(value);
1987 	return error;
1988 }
1989 #endif  /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
1990