1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/fs.h>
17#include <linux/file.h>
18#include <linux/splice.h>
19#include <linux/fcntl.h>
20#include <linux/namei.h>
21#include <linux/delay.h>
22#include <linux/fsnotify.h>
23#include <linux/posix_acl_xattr.h>
24#include <linux/xattr.h>
25#include <linux/jhash.h>
26#include <linux/ima.h>
27#include <linux/slab.h>
28#include <asm/uaccess.h>
29#include <linux/exportfs.h>
30#include <linux/writeback.h>
31
32#ifdef CONFIG_NFSD_V3
33#include "xdr3.h"
34#endif
35
36#ifdef CONFIG_NFSD_V4
37#include "acl.h"
38#include "idmap.h"
39#endif
40
41#include "nfsd.h"
42#include "vfs.h"
43
44#define NFSDDBG_FACILITY NFSDDBG_FILEOP
45
46
47
48
49
50
51
52
53
54struct raparms {
55 struct raparms *p_next;
56 unsigned int p_count;
57 ino_t p_ino;
58 dev_t p_dev;
59 int p_set;
60 struct file_ra_state p_ra;
61 unsigned int p_hindex;
62};
63
64struct raparm_hbucket {
65 struct raparms *pb_head;
66 spinlock_t pb_lock;
67} ____cacheline_aligned_in_smp;
68
69#define RAPARM_HASH_BITS 4
70#define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
71#define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
72static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
73
74
75
76
77
78
79
80int
81nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
82 struct svc_export **expp)
83{
84 struct svc_export *exp = *expp, *exp2 = NULL;
85 struct dentry *dentry = *dpp;
86 struct path path = {.mnt = mntget(exp->ex_path.mnt),
87 .dentry = dget(dentry)};
88 int err = 0;
89
90 err = follow_down(&path);
91 if (err < 0)
92 goto out;
93
94 exp2 = rqst_exp_get_by_name(rqstp, &path);
95 if (IS_ERR(exp2)) {
96 err = PTR_ERR(exp2);
97
98
99
100
101
102
103
104 if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT))
105 err = 0;
106 path_put(&path);
107 goto out;
108 }
109 if (nfsd_v4client(rqstp) ||
110 (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
111
112
113
114
115
116
117
118 *dpp = path.dentry;
119 path.dentry = dentry;
120 *expp = exp2;
121 exp2 = exp;
122 }
123 path_put(&path);
124 exp_put(exp2);
125out:
126 return err;
127}
128
129static void follow_to_parent(struct path *path)
130{
131 struct dentry *dp;
132
133 while (path->dentry == path->mnt->mnt_root && follow_up(path))
134 ;
135 dp = dget_parent(path->dentry);
136 dput(path->dentry);
137 path->dentry = dp;
138}
139
140static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp)
141{
142 struct svc_export *exp2;
143 struct path path = {.mnt = mntget((*exp)->ex_path.mnt),
144 .dentry = dget(dparent)};
145
146 follow_to_parent(&path);
147
148 exp2 = rqst_exp_parent(rqstp, &path);
149 if (PTR_ERR(exp2) == -ENOENT) {
150 *dentryp = dget(dparent);
151 } else if (IS_ERR(exp2)) {
152 path_put(&path);
153 return PTR_ERR(exp2);
154 } else {
155 *dentryp = dget(path.dentry);
156 exp_put(*exp);
157 *exp = exp2;
158 }
159 path_put(&path);
160 return 0;
161}
162
163
164
165
166
167int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
168{
169 if (d_mountpoint(dentry))
170 return 1;
171 if (!(exp->ex_flags & NFSEXP_V4ROOT))
172 return 0;
173 return dentry->d_inode != NULL;
174}
175
176__be32
177nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
178 const char *name, unsigned int len,
179 struct svc_export **exp_ret, struct dentry **dentry_ret)
180{
181 struct svc_export *exp;
182 struct dentry *dparent;
183 struct dentry *dentry;
184 __be32 err;
185 int host_err;
186
187 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
188
189
190 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
191 if (err)
192 return err;
193
194 dparent = fhp->fh_dentry;
195 exp = fhp->fh_export;
196 exp_get(exp);
197
198
199 if (isdotent(name, len)) {
200 if (len==1)
201 dentry = dget(dparent);
202 else if (dparent != exp->ex_path.dentry)
203 dentry = dget_parent(dparent);
204 else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp))
205 dentry = dget(dparent);
206 else {
207
208 host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry);
209 if (host_err)
210 goto out_nfserr;
211 }
212 } else {
213 fh_lock(fhp);
214 dentry = lookup_one_len(name, dparent, len);
215 host_err = PTR_ERR(dentry);
216 if (IS_ERR(dentry))
217 goto out_nfserr;
218
219
220
221 if (nfsd_mountpoint(dentry, exp)) {
222 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
223 dput(dentry);
224 goto out_nfserr;
225 }
226 }
227 }
228 *dentry_ret = dentry;
229 *exp_ret = exp;
230 return 0;
231
232out_nfserr:
233 exp_put(exp);
234 return nfserrno(host_err);
235}
236
237
238
239
240
241
242
243
244
245
246
247
248
249__be32
250nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
251 unsigned int len, struct svc_fh *resfh)
252{
253 struct svc_export *exp;
254 struct dentry *dentry;
255 __be32 err;
256
257 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
258 if (err)
259 return err;
260 err = check_nfsd_access(exp, rqstp);
261 if (err)
262 goto out;
263
264
265
266
267 err = fh_compose(resfh, exp, dentry, fhp);
268 if (!err && !dentry->d_inode)
269 err = nfserr_noent;
270out:
271 dput(dentry);
272 exp_put(exp);
273 return err;
274}
275
276static int nfsd_break_lease(struct inode *inode)
277{
278 if (!S_ISREG(inode->i_mode))
279 return 0;
280 return break_lease(inode, O_WRONLY | O_NONBLOCK);
281}
282
283
284
285
286static int
287commit_metadata(struct svc_fh *fhp)
288{
289 struct inode *inode = fhp->fh_dentry->d_inode;
290 const struct export_operations *export_ops = inode->i_sb->s_export_op;
291
292 if (!EX_ISSYNC(fhp->fh_export))
293 return 0;
294
295 if (export_ops->commit_metadata)
296 return export_ops->commit_metadata(inode);
297 return sync_inode_metadata(inode, 1);
298}
299
300
301
302
303
304__be32
305nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
306 int check_guard, time_t guardtime)
307{
308 struct dentry *dentry;
309 struct inode *inode;
310 int accmode = NFSD_MAY_SATTR;
311 int ftype = 0;
312 __be32 err;
313 int host_err;
314 int size_change = 0;
315
316 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
317 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
318 if (iap->ia_valid & ATTR_SIZE)
319 ftype = S_IFREG;
320
321
322 err = fh_verify(rqstp, fhp, ftype, accmode);
323 if (err)
324 goto out;
325
326 dentry = fhp->fh_dentry;
327 inode = dentry->d_inode;
328
329
330 if (S_ISLNK(inode->i_mode))
331 iap->ia_valid &= ~ATTR_MODE;
332
333 if (!iap->ia_valid)
334 goto out;
335
336
337
338
339
340
341
342
343
344
345
346
347
348#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
349#define MAX_TOUCH_TIME_ERROR (30*60)
350 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
351 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
352
353
354
355
356
357
358
359 time_t delta = iap->ia_atime.tv_sec - get_seconds();
360 if (delta < 0)
361 delta = -delta;
362 if (delta < MAX_TOUCH_TIME_ERROR &&
363 inode_change_ok(inode, iap) != 0) {
364
365
366
367
368
369 iap->ia_valid &= ~BOTH_TIME_SET;
370 }
371 }
372
373
374
375
376
377 if (iap->ia_valid & ATTR_SIZE) {
378 if (iap->ia_size < inode->i_size) {
379 err = nfsd_permission(rqstp, fhp->fh_export, dentry,
380 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
381 if (err)
382 goto out;
383 }
384
385 host_err = get_write_access(inode);
386 if (host_err)
387 goto out_nfserr;
388
389 size_change = 1;
390 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
391 if (host_err) {
392 put_write_access(inode);
393 goto out_nfserr;
394 }
395 }
396
397
398 if (iap->ia_valid & ATTR_MODE) {
399 iap->ia_mode &= S_IALLUGO;
400 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
401 }
402
403
404 if (!S_ISDIR(inode->i_mode) &&
405 (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
406 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
407 iap->ia_valid |= ATTR_KILL_PRIV;
408 if (iap->ia_valid & ATTR_MODE) {
409
410 iap->ia_mode &= ~S_ISUID;
411 if (iap->ia_mode & S_IXGRP)
412 iap->ia_mode &= ~S_ISGID;
413 } else {
414
415 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
416 }
417 }
418
419
420
421 iap->ia_valid |= ATTR_CTIME;
422
423 err = nfserr_notsync;
424 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
425 host_err = nfsd_break_lease(inode);
426 if (host_err)
427 goto out_nfserr;
428 fh_lock(fhp);
429
430 host_err = notify_change(dentry, iap);
431 err = nfserrno(host_err);
432 fh_unlock(fhp);
433 }
434 if (size_change)
435 put_write_access(inode);
436 if (!err)
437 commit_metadata(fhp);
438out:
439 return err;
440
441out_nfserr:
442 err = nfserrno(host_err);
443 goto out;
444}
445
446#if defined(CONFIG_NFSD_V2_ACL) || \
447 defined(CONFIG_NFSD_V3_ACL) || \
448 defined(CONFIG_NFSD_V4)
449static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
450{
451 ssize_t buflen;
452 ssize_t ret;
453
454 buflen = vfs_getxattr(dentry, key, NULL, 0);
455 if (buflen <= 0)
456 return buflen;
457
458 *buf = kmalloc(buflen, GFP_KERNEL);
459 if (!*buf)
460 return -ENOMEM;
461
462 ret = vfs_getxattr(dentry, key, *buf, buflen);
463 if (ret < 0)
464 kfree(*buf);
465 return ret;
466}
467#endif
468
469#if defined(CONFIG_NFSD_V4)
470static int
471set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
472{
473 int len;
474 size_t buflen;
475 char *buf = NULL;
476 int error = 0;
477
478 buflen = posix_acl_xattr_size(pacl->a_count);
479 buf = kmalloc(buflen, GFP_KERNEL);
480 error = -ENOMEM;
481 if (buf == NULL)
482 goto out;
483
484 len = posix_acl_to_xattr(pacl, buf, buflen);
485 if (len < 0) {
486 error = len;
487 goto out;
488 }
489
490 error = vfs_setxattr(dentry, key, buf, len, 0);
491out:
492 kfree(buf);
493 return error;
494}
495
496__be32
497nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
498 struct nfs4_acl *acl)
499{
500 __be32 error;
501 int host_error;
502 struct dentry *dentry;
503 struct inode *inode;
504 struct posix_acl *pacl = NULL, *dpacl = NULL;
505 unsigned int flags = 0;
506
507
508 error = fh_verify(rqstp, fhp, 0 , NFSD_MAY_SATTR);
509 if (error)
510 return error;
511
512 dentry = fhp->fh_dentry;
513 inode = dentry->d_inode;
514 if (S_ISDIR(inode->i_mode))
515 flags = NFS4_ACL_DIR;
516
517 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
518 if (host_error == -EINVAL) {
519 return nfserr_attrnotsupp;
520 } else if (host_error < 0)
521 goto out_nfserr;
522
523 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
524 if (host_error < 0)
525 goto out_release;
526
527 if (S_ISDIR(inode->i_mode))
528 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
529
530out_release:
531 posix_acl_release(pacl);
532 posix_acl_release(dpacl);
533out_nfserr:
534 if (host_error == -EOPNOTSUPP)
535 return nfserr_attrnotsupp;
536 else
537 return nfserrno(host_error);
538}
539
540static struct posix_acl *
541_get_posix_acl(struct dentry *dentry, char *key)
542{
543 void *buf = NULL;
544 struct posix_acl *pacl = NULL;
545 int buflen;
546
547 buflen = nfsd_getxattr(dentry, key, &buf);
548 if (!buflen)
549 buflen = -ENODATA;
550 if (buflen <= 0)
551 return ERR_PTR(buflen);
552
553 pacl = posix_acl_from_xattr(buf, buflen);
554 kfree(buf);
555 return pacl;
556}
557
558int
559nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
560{
561 struct inode *inode = dentry->d_inode;
562 int error = 0;
563 struct posix_acl *pacl = NULL, *dpacl = NULL;
564 unsigned int flags = 0;
565
566 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
567 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
568 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
569 if (IS_ERR(pacl)) {
570 error = PTR_ERR(pacl);
571 pacl = NULL;
572 goto out;
573 }
574
575 if (S_ISDIR(inode->i_mode)) {
576 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
577 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
578 dpacl = NULL;
579 else if (IS_ERR(dpacl)) {
580 error = PTR_ERR(dpacl);
581 dpacl = NULL;
582 goto out;
583 }
584 flags = NFS4_ACL_DIR;
585 }
586
587 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
588 if (IS_ERR(*acl)) {
589 error = PTR_ERR(*acl);
590 *acl = NULL;
591 }
592 out:
593 posix_acl_release(pacl);
594 posix_acl_release(dpacl);
595 return error;
596}
597
598#endif
599
600#ifdef CONFIG_NFSD_V3
601
602
603
604struct accessmap {
605 u32 access;
606 int how;
607};
608static struct accessmap nfs3_regaccess[] = {
609 { NFS3_ACCESS_READ, NFSD_MAY_READ },
610 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
611 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
612 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
613
614 { 0, 0 }
615};
616
617static struct accessmap nfs3_diraccess[] = {
618 { NFS3_ACCESS_READ, NFSD_MAY_READ },
619 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
620 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
621 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
622 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
623
624 { 0, 0 }
625};
626
627static struct accessmap nfs3_anyaccess[] = {
628
629
630
631
632
633
634
635 { NFS3_ACCESS_READ, NFSD_MAY_READ },
636 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
637 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
638 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
639
640 { 0, 0 }
641};
642
643__be32
644nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
645{
646 struct accessmap *map;
647 struct svc_export *export;
648 struct dentry *dentry;
649 u32 query, result = 0, sresult = 0;
650 __be32 error;
651
652 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
653 if (error)
654 goto out;
655
656 export = fhp->fh_export;
657 dentry = fhp->fh_dentry;
658
659 if (S_ISREG(dentry->d_inode->i_mode))
660 map = nfs3_regaccess;
661 else if (S_ISDIR(dentry->d_inode->i_mode))
662 map = nfs3_diraccess;
663 else
664 map = nfs3_anyaccess;
665
666
667 query = *access;
668 for (; map->access; map++) {
669 if (map->access & query) {
670 __be32 err2;
671
672 sresult |= map->access;
673
674 err2 = nfsd_permission(rqstp, export, dentry, map->how);
675 switch (err2) {
676 case nfs_ok:
677 result |= map->access;
678 break;
679
680
681
682 case nfserr_rofs:
683 case nfserr_acces:
684 case nfserr_perm:
685
686 break;
687 default:
688 error = err2;
689 goto out;
690 }
691 }
692 }
693 *access = result;
694 if (supported)
695 *supported = sresult;
696
697 out:
698 return error;
699}
700#endif
701
702
703
704
705
706
707
708
709__be32
710nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
711 int access, struct file **filp)
712{
713 struct dentry *dentry;
714 struct inode *inode;
715 int flags = O_RDONLY|O_LARGEFILE;
716 __be32 err;
717 int host_err = 0;
718
719 validate_process_creds();
720
721
722
723
724
725
726 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
727 if (err)
728 goto out;
729
730 dentry = fhp->fh_dentry;
731 inode = dentry->d_inode;
732
733
734
735
736 err = nfserr_perm;
737 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE))
738 goto out;
739
740
741
742
743
744 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
745 goto out;
746
747 if (!inode->i_fop)
748 goto out;
749
750
751
752
753
754 if (!(access & NFSD_MAY_NOT_BREAK_LEASE))
755 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0));
756 if (host_err)
757 goto out_nfserr;
758
759 if (access & NFSD_MAY_WRITE) {
760 if (access & NFSD_MAY_READ)
761 flags = O_RDWR|O_LARGEFILE;
762 else
763 flags = O_WRONLY|O_LARGEFILE;
764 }
765 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
766 flags, current_cred());
767 if (IS_ERR(*filp))
768 host_err = PTR_ERR(*filp);
769 else
770 host_err = ima_file_check(*filp, access);
771out_nfserr:
772 err = nfserrno(host_err);
773out:
774 validate_process_creds();
775 return err;
776}
777
778
779
780
781void
782nfsd_close(struct file *filp)
783{
784 fput(filp);
785}
786
787
788
789
790
791
792static inline struct raparms *
793nfsd_get_raparms(dev_t dev, ino_t ino)
794{
795 struct raparms *ra, **rap, **frap = NULL;
796 int depth = 0;
797 unsigned int hash;
798 struct raparm_hbucket *rab;
799
800 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
801 rab = &raparm_hash[hash];
802
803 spin_lock(&rab->pb_lock);
804 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
805 if (ra->p_ino == ino && ra->p_dev == dev)
806 goto found;
807 depth++;
808 if (ra->p_count == 0)
809 frap = rap;
810 }
811 depth = nfsdstats.ra_size;
812 if (!frap) {
813 spin_unlock(&rab->pb_lock);
814 return NULL;
815 }
816 rap = frap;
817 ra = *frap;
818 ra->p_dev = dev;
819 ra->p_ino = ino;
820 ra->p_set = 0;
821 ra->p_hindex = hash;
822found:
823 if (rap != &rab->pb_head) {
824 *rap = ra->p_next;
825 ra->p_next = rab->pb_head;
826 rab->pb_head = ra;
827 }
828 ra->p_count++;
829 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
830 spin_unlock(&rab->pb_lock);
831 return ra;
832}
833
834
835
836
837
838
839static int
840nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
841 struct splice_desc *sd)
842{
843 struct svc_rqst *rqstp = sd->u.data;
844 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
845 struct page *page = buf->page;
846 size_t size;
847
848 size = sd->len;
849
850 if (rqstp->rq_res.page_len == 0) {
851 get_page(page);
852 put_page(*pp);
853 *pp = page;
854 rqstp->rq_resused++;
855 rqstp->rq_res.page_base = buf->offset;
856 rqstp->rq_res.page_len = size;
857 } else if (page != pp[-1]) {
858 get_page(page);
859 if (*pp)
860 put_page(*pp);
861 *pp = page;
862 rqstp->rq_resused++;
863 rqstp->rq_res.page_len += size;
864 } else
865 rqstp->rq_res.page_len += size;
866
867 return size;
868}
869
870static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
871 struct splice_desc *sd)
872{
873 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
874}
875
876static __be32
877nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
878 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
879{
880 struct inode *inode;
881 mm_segment_t oldfs;
882 __be32 err;
883 int host_err;
884
885 err = nfserr_perm;
886 inode = file->f_path.dentry->d_inode;
887
888 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
889 struct splice_desc sd = {
890 .len = 0,
891 .total_len = *count,
892 .pos = offset,
893 .u.data = rqstp,
894 };
895
896 rqstp->rq_resused = 1;
897 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
898 } else {
899 oldfs = get_fs();
900 set_fs(KERNEL_DS);
901 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
902 set_fs(oldfs);
903 }
904
905 if (host_err >= 0) {
906 nfsdstats.io_read += host_err;
907 *count = host_err;
908 err = 0;
909 fsnotify_access(file);
910 } else
911 err = nfserrno(host_err);
912 return err;
913}
914
915static void kill_suid(struct dentry *dentry)
916{
917 struct iattr ia;
918 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
919
920 mutex_lock(&dentry->d_inode->i_mutex);
921 notify_change(dentry, &ia);
922 mutex_unlock(&dentry->d_inode->i_mutex);
923}
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939static int wait_for_concurrent_writes(struct file *file)
940{
941 struct inode *inode = file->f_path.dentry->d_inode;
942 static ino_t last_ino;
943 static dev_t last_dev;
944 int err = 0;
945
946 if (atomic_read(&inode->i_writecount) > 1
947 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
948 dprintk("nfsd: write defer %d\n", task_pid_nr(current));
949 msleep(10);
950 dprintk("nfsd: write resume %d\n", task_pid_nr(current));
951 }
952
953 if (inode->i_state & I_DIRTY) {
954 dprintk("nfsd: write sync %d\n", task_pid_nr(current));
955 err = vfs_fsync(file, 0);
956 }
957 last_ino = inode->i_ino;
958 last_dev = inode->i_sb->s_dev;
959 return err;
960}
961
962static __be32
963nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
964 loff_t offset, struct kvec *vec, int vlen,
965 unsigned long *cnt, int *stablep)
966{
967 struct svc_export *exp;
968 struct dentry *dentry;
969 struct inode *inode;
970 mm_segment_t oldfs;
971 __be32 err = 0;
972 int host_err;
973 int stable = *stablep;
974 int use_wgather;
975
976 dentry = file->f_path.dentry;
977 inode = dentry->d_inode;
978 exp = fhp->fh_export;
979
980
981
982
983
984
985
986
987
988 use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
989
990 if (!file->f_op->fsync) {
991 stable = 2;
992 *stablep = 2;
993 }
994
995 if (!EX_ISSYNC(exp))
996 stable = 0;
997 if (stable && !use_wgather) {
998 spin_lock(&file->f_lock);
999 file->f_flags |= O_SYNC;
1000 spin_unlock(&file->f_lock);
1001 }
1002
1003
1004 oldfs = get_fs(); set_fs(KERNEL_DS);
1005 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
1006 set_fs(oldfs);
1007 if (host_err < 0)
1008 goto out_nfserr;
1009 *cnt = host_err;
1010 nfsdstats.io_write += host_err;
1011 fsnotify_modify(file);
1012
1013
1014 if (inode->i_mode & (S_ISUID | S_ISGID))
1015 kill_suid(dentry);
1016
1017 if (stable && use_wgather)
1018 host_err = wait_for_concurrent_writes(file);
1019
1020out_nfserr:
1021 dprintk("nfsd: write complete host_err=%d\n", host_err);
1022 if (host_err >= 0)
1023 err = 0;
1024 else
1025 err = nfserrno(host_err);
1026 return err;
1027}
1028
1029
1030
1031
1032
1033
1034__be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
1035 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
1036{
1037 struct file *file;
1038 struct inode *inode;
1039 struct raparms *ra;
1040 __be32 err;
1041
1042 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
1043 if (err)
1044 return err;
1045
1046 inode = file->f_path.dentry->d_inode;
1047
1048
1049 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
1050
1051 if (ra && ra->p_set)
1052 file->f_ra = ra->p_ra;
1053
1054 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1055
1056
1057 if (ra) {
1058 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
1059 spin_lock(&rab->pb_lock);
1060 ra->p_ra = file->f_ra;
1061 ra->p_set = 1;
1062 ra->p_count--;
1063 spin_unlock(&rab->pb_lock);
1064 }
1065
1066 nfsd_close(file);
1067 return err;
1068}
1069
1070
1071__be32
1072nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1073 loff_t offset, struct kvec *vec, int vlen,
1074 unsigned long *count)
1075{
1076 __be32 err;
1077
1078 if (file) {
1079 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1080 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
1081 if (err)
1082 goto out;
1083 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1084 } else
1085 err = nfsd_read(rqstp, fhp, offset, vec, vlen, count);
1086out:
1087 return err;
1088}
1089
1090
1091
1092
1093
1094
1095__be32
1096nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1097 loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
1098 int *stablep)
1099{
1100 __be32 err = 0;
1101
1102 if (file) {
1103 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1104 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
1105 if (err)
1106 goto out;
1107 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1108 stablep);
1109 } else {
1110 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1111 if (err)
1112 goto out;
1113
1114 if (cnt)
1115 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1116 cnt, stablep);
1117 nfsd_close(file);
1118 }
1119out:
1120 return err;
1121}
1122
1123#ifdef CONFIG_NFSD_V3
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133__be32
1134nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1135 loff_t offset, unsigned long count)
1136{
1137 struct file *file;
1138 loff_t end = LLONG_MAX;
1139 __be32 err = nfserr_inval;
1140
1141 if (offset < 0)
1142 goto out;
1143 if (count != 0) {
1144 end = offset + (loff_t)count - 1;
1145 if (end < offset)
1146 goto out;
1147 }
1148
1149 err = nfsd_open(rqstp, fhp, S_IFREG,
1150 NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file);
1151 if (err)
1152 goto out;
1153 if (EX_ISSYNC(fhp->fh_export)) {
1154 int err2 = vfs_fsync_range(file, offset, end, 0);
1155
1156 if (err2 != -EINVAL)
1157 err = nfserrno(err2);
1158 else
1159 err = nfserr_notsupp;
1160 }
1161
1162 nfsd_close(file);
1163out:
1164 return err;
1165}
1166#endif
1167
1168static __be32
1169nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
1170 struct iattr *iap)
1171{
1172
1173
1174
1175 iap->ia_valid &= ~ATTR_MODE;
1176
1177
1178
1179
1180
1181 if (current_fsuid() != 0)
1182 iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
1183 if (iap->ia_valid)
1184 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1185 return 0;
1186}
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196static void
1197nfsd_check_ignore_resizing(struct iattr *iap)
1198{
1199 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
1200 iap->ia_valid &= ~ATTR_SIZE;
1201}
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211__be32
1212nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1213 char *fname, int flen, struct iattr *iap,
1214 int type, dev_t rdev, struct svc_fh *resfhp)
1215{
1216 struct dentry *dentry, *dchild = NULL;
1217 struct inode *dirp;
1218 __be32 err;
1219 __be32 err2;
1220 int host_err;
1221
1222 err = nfserr_perm;
1223 if (!flen)
1224 goto out;
1225 err = nfserr_exist;
1226 if (isdotent(fname, flen))
1227 goto out;
1228
1229 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1230 if (err)
1231 goto out;
1232
1233 dentry = fhp->fh_dentry;
1234 dirp = dentry->d_inode;
1235
1236 err = nfserr_notdir;
1237 if (!dirp->i_op->lookup)
1238 goto out;
1239
1240
1241
1242
1243 if (!resfhp->fh_dentry) {
1244
1245 fh_lock_nested(fhp, I_MUTEX_PARENT);
1246 dchild = lookup_one_len(fname, dentry, flen);
1247 host_err = PTR_ERR(dchild);
1248 if (IS_ERR(dchild))
1249 goto out_nfserr;
1250 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1251 if (err)
1252 goto out;
1253 } else {
1254
1255 dchild = dget(resfhp->fh_dentry);
1256 if (!fhp->fh_locked) {
1257
1258 printk(KERN_ERR
1259 "nfsd_create: parent %s/%s not locked!\n",
1260 dentry->d_parent->d_name.name,
1261 dentry->d_name.name);
1262 err = nfserr_io;
1263 goto out;
1264 }
1265 }
1266
1267
1268
1269 err = nfserr_exist;
1270 if (dchild->d_inode) {
1271 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1272 dentry->d_name.name, dchild->d_name.name);
1273 goto out;
1274 }
1275
1276 if (!(iap->ia_valid & ATTR_MODE))
1277 iap->ia_mode = 0;
1278 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1279
1280 err = nfserr_inval;
1281 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
1282 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
1283 type);
1284 goto out;
1285 }
1286
1287 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1288 if (host_err)
1289 goto out_nfserr;
1290
1291
1292
1293
1294 err = 0;
1295 switch (type) {
1296 case S_IFREG:
1297 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1298 if (!host_err)
1299 nfsd_check_ignore_resizing(iap);
1300 break;
1301 case S_IFDIR:
1302 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1303 break;
1304 case S_IFCHR:
1305 case S_IFBLK:
1306 case S_IFIFO:
1307 case S_IFSOCK:
1308 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1309 break;
1310 }
1311 if (host_err < 0) {
1312 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1313 goto out_nfserr;
1314 }
1315
1316 err = nfsd_create_setattr(rqstp, resfhp, iap);
1317
1318
1319
1320
1321
1322
1323 err2 = nfserrno(commit_metadata(fhp));
1324 if (err2)
1325 err = err2;
1326 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1327
1328
1329
1330 if (!err)
1331 err = fh_update(resfhp);
1332out:
1333 if (dchild && !IS_ERR(dchild))
1334 dput(dchild);
1335 return err;
1336
1337out_nfserr:
1338 err = nfserrno(host_err);
1339 goto out;
1340}
1341
1342#ifdef CONFIG_NFSD_V3
1343
1344
1345
1346__be32
1347nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1348 char *fname, int flen, struct iattr *iap,
1349 struct svc_fh *resfhp, int createmode, u32 *verifier,
1350 int *truncp, int *created)
1351{
1352 struct dentry *dentry, *dchild = NULL;
1353 struct inode *dirp;
1354 __be32 err;
1355 int host_err;
1356 __u32 v_mtime=0, v_atime=0;
1357
1358 err = nfserr_perm;
1359 if (!flen)
1360 goto out;
1361 err = nfserr_exist;
1362 if (isdotent(fname, flen))
1363 goto out;
1364 if (!(iap->ia_valid & ATTR_MODE))
1365 iap->ia_mode = 0;
1366 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
1367 if (err)
1368 goto out;
1369
1370 dentry = fhp->fh_dentry;
1371 dirp = dentry->d_inode;
1372
1373
1374
1375 err = nfserr_notdir;
1376 if (!dirp->i_op->lookup)
1377 goto out;
1378 fh_lock_nested(fhp, I_MUTEX_PARENT);
1379
1380
1381
1382
1383 dchild = lookup_one_len(fname, dentry, flen);
1384 host_err = PTR_ERR(dchild);
1385 if (IS_ERR(dchild))
1386 goto out_nfserr;
1387
1388
1389 if (!dchild->d_inode) {
1390 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1391 if (err)
1392 goto out;
1393 }
1394
1395 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1396 if (err)
1397 goto out;
1398
1399 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1400
1401
1402
1403
1404
1405
1406 v_mtime = verifier[0]&0x7fffffff;
1407 v_atime = verifier[1]&0x7fffffff;
1408 }
1409
1410 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1411 if (host_err)
1412 goto out_nfserr;
1413 if (dchild->d_inode) {
1414 err = 0;
1415
1416 switch (createmode) {
1417 case NFS3_CREATE_UNCHECKED:
1418 if (! S_ISREG(dchild->d_inode->i_mode))
1419 err = nfserr_exist;
1420 else if (truncp) {
1421
1422
1423
1424
1425
1426
1427
1428 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1429 }
1430 else {
1431 iap->ia_valid &= ATTR_SIZE;
1432 goto set_attr;
1433 }
1434 break;
1435 case NFS3_CREATE_EXCLUSIVE:
1436 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1437 && dchild->d_inode->i_atime.tv_sec == v_atime
1438 && dchild->d_inode->i_size == 0 )
1439 break;
1440
1441 case NFS3_CREATE_GUARDED:
1442 err = nfserr_exist;
1443 }
1444 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1445 goto out;
1446 }
1447
1448 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1449 if (host_err < 0) {
1450 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1451 goto out_nfserr;
1452 }
1453 if (created)
1454 *created = 1;
1455
1456 nfsd_check_ignore_resizing(iap);
1457
1458 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1459
1460 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1461 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1462
1463 iap->ia_mtime.tv_sec = v_mtime;
1464 iap->ia_atime.tv_sec = v_atime;
1465 iap->ia_mtime.tv_nsec = 0;
1466 iap->ia_atime.tv_nsec = 0;
1467 }
1468
1469 set_attr:
1470 err = nfsd_create_setattr(rqstp, resfhp, iap);
1471
1472
1473
1474
1475 if (!err)
1476 err = nfserrno(commit_metadata(fhp));
1477
1478 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1479
1480
1481
1482 if (!err)
1483 err = fh_update(resfhp);
1484
1485 out:
1486 fh_unlock(fhp);
1487 if (dchild && !IS_ERR(dchild))
1488 dput(dchild);
1489 return err;
1490
1491 out_nfserr:
1492 err = nfserrno(host_err);
1493 goto out;
1494}
1495#endif
1496
1497
1498
1499
1500
1501
1502__be32
1503nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1504{
1505 struct dentry *dentry;
1506 struct inode *inode;
1507 mm_segment_t oldfs;
1508 __be32 err;
1509 int host_err;
1510
1511 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
1512 if (err)
1513 goto out;
1514
1515 dentry = fhp->fh_dentry;
1516 inode = dentry->d_inode;
1517
1518 err = nfserr_inval;
1519 if (!inode->i_op->readlink)
1520 goto out;
1521
1522 touch_atime(fhp->fh_export->ex_path.mnt, dentry);
1523
1524
1525
1526
1527 oldfs = get_fs(); set_fs(KERNEL_DS);
1528 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1529 set_fs(oldfs);
1530
1531 if (host_err < 0)
1532 goto out_nfserr;
1533 *lenp = host_err;
1534 err = 0;
1535out:
1536 return err;
1537
1538out_nfserr:
1539 err = nfserrno(host_err);
1540 goto out;
1541}
1542
1543
1544
1545
1546
1547__be32
1548nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1549 char *fname, int flen,
1550 char *path, int plen,
1551 struct svc_fh *resfhp,
1552 struct iattr *iap)
1553{
1554 struct dentry *dentry, *dnew;
1555 __be32 err, cerr;
1556 int host_err;
1557
1558 err = nfserr_noent;
1559 if (!flen || !plen)
1560 goto out;
1561 err = nfserr_exist;
1562 if (isdotent(fname, flen))
1563 goto out;
1564
1565 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1566 if (err)
1567 goto out;
1568 fh_lock(fhp);
1569 dentry = fhp->fh_dentry;
1570 dnew = lookup_one_len(fname, dentry, flen);
1571 host_err = PTR_ERR(dnew);
1572 if (IS_ERR(dnew))
1573 goto out_nfserr;
1574
1575 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1576 if (host_err)
1577 goto out_nfserr;
1578
1579 if (unlikely(path[plen] != 0)) {
1580 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1581 if (path_alloced == NULL)
1582 host_err = -ENOMEM;
1583 else {
1584 strncpy(path_alloced, path, plen);
1585 path_alloced[plen] = 0;
1586 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
1587 kfree(path_alloced);
1588 }
1589 } else
1590 host_err = vfs_symlink(dentry->d_inode, dnew, path);
1591 err = nfserrno(host_err);
1592 if (!err)
1593 err = nfserrno(commit_metadata(fhp));
1594 fh_unlock(fhp);
1595
1596 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1597
1598 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1599 dput(dnew);
1600 if (err==0) err = cerr;
1601out:
1602 return err;
1603
1604out_nfserr:
1605 err = nfserrno(host_err);
1606 goto out;
1607}
1608
1609
1610
1611
1612
1613__be32
1614nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1615 char *name, int len, struct svc_fh *tfhp)
1616{
1617 struct dentry *ddir, *dnew, *dold;
1618 struct inode *dirp;
1619 __be32 err;
1620 int host_err;
1621
1622 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
1623 if (err)
1624 goto out;
1625 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
1626 if (err)
1627 goto out;
1628
1629 err = nfserr_perm;
1630 if (!len)
1631 goto out;
1632 err = nfserr_exist;
1633 if (isdotent(name, len))
1634 goto out;
1635
1636 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1637 ddir = ffhp->fh_dentry;
1638 dirp = ddir->d_inode;
1639
1640 dnew = lookup_one_len(name, ddir, len);
1641 host_err = PTR_ERR(dnew);
1642 if (IS_ERR(dnew))
1643 goto out_nfserr;
1644
1645 dold = tfhp->fh_dentry;
1646
1647 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
1648 if (host_err) {
1649 err = nfserrno(host_err);
1650 goto out_dput;
1651 }
1652 err = nfserr_noent;
1653 if (!dold->d_inode)
1654 goto out_drop_write;
1655 host_err = nfsd_break_lease(dold->d_inode);
1656 if (host_err)
1657 goto out_drop_write;
1658 host_err = vfs_link(dold, dirp, dnew);
1659 if (!host_err) {
1660 err = nfserrno(commit_metadata(ffhp));
1661 if (!err)
1662 err = nfserrno(commit_metadata(tfhp));
1663 } else {
1664 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1665 err = nfserr_acces;
1666 else
1667 err = nfserrno(host_err);
1668 }
1669out_drop_write:
1670 mnt_drop_write(tfhp->fh_export->ex_path.mnt);
1671out_dput:
1672 dput(dnew);
1673out_unlock:
1674 fh_unlock(ffhp);
1675out:
1676 return err;
1677
1678out_nfserr:
1679 err = nfserrno(host_err);
1680 goto out_unlock;
1681}
1682
1683
1684
1685
1686
1687__be32
1688nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1689 struct svc_fh *tfhp, char *tname, int tlen)
1690{
1691 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1692 struct inode *fdir, *tdir;
1693 __be32 err;
1694 int host_err;
1695
1696 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
1697 if (err)
1698 goto out;
1699 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
1700 if (err)
1701 goto out;
1702
1703 fdentry = ffhp->fh_dentry;
1704 fdir = fdentry->d_inode;
1705
1706 tdentry = tfhp->fh_dentry;
1707 tdir = tdentry->d_inode;
1708
1709 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1710 if (ffhp->fh_export != tfhp->fh_export)
1711 goto out;
1712
1713 err = nfserr_perm;
1714 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1715 goto out;
1716
1717
1718
1719 trap = lock_rename(tdentry, fdentry);
1720 ffhp->fh_locked = tfhp->fh_locked = 1;
1721 fill_pre_wcc(ffhp);
1722 fill_pre_wcc(tfhp);
1723
1724 odentry = lookup_one_len(fname, fdentry, flen);
1725 host_err = PTR_ERR(odentry);
1726 if (IS_ERR(odentry))
1727 goto out_nfserr;
1728
1729 host_err = -ENOENT;
1730 if (!odentry->d_inode)
1731 goto out_dput_old;
1732 host_err = -EINVAL;
1733 if (odentry == trap)
1734 goto out_dput_old;
1735
1736 ndentry = lookup_one_len(tname, tdentry, tlen);
1737 host_err = PTR_ERR(ndentry);
1738 if (IS_ERR(ndentry))
1739 goto out_dput_old;
1740 host_err = -ENOTEMPTY;
1741 if (ndentry == trap)
1742 goto out_dput_new;
1743
1744 host_err = -EXDEV;
1745 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
1746 goto out_dput_new;
1747 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
1748 if (host_err)
1749 goto out_dput_new;
1750
1751 host_err = nfsd_break_lease(odentry->d_inode);
1752 if (host_err)
1753 goto out_drop_write;
1754 if (ndentry->d_inode) {
1755 host_err = nfsd_break_lease(ndentry->d_inode);
1756 if (host_err)
1757 goto out_drop_write;
1758 }
1759 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1760 if (!host_err) {
1761 host_err = commit_metadata(tfhp);
1762 if (!host_err)
1763 host_err = commit_metadata(ffhp);
1764 }
1765out_drop_write:
1766 mnt_drop_write(ffhp->fh_export->ex_path.mnt);
1767 out_dput_new:
1768 dput(ndentry);
1769 out_dput_old:
1770 dput(odentry);
1771 out_nfserr:
1772 err = nfserrno(host_err);
1773
1774
1775
1776
1777
1778 fill_post_wcc(ffhp);
1779 fill_post_wcc(tfhp);
1780 unlock_rename(tdentry, fdentry);
1781 ffhp->fh_locked = tfhp->fh_locked = 0;
1782
1783out:
1784 return err;
1785}
1786
1787
1788
1789
1790
1791__be32
1792nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1793 char *fname, int flen)
1794{
1795 struct dentry *dentry, *rdentry;
1796 struct inode *dirp;
1797 __be32 err;
1798 int host_err;
1799
1800 err = nfserr_acces;
1801 if (!flen || isdotent(fname, flen))
1802 goto out;
1803 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE);
1804 if (err)
1805 goto out;
1806
1807 fh_lock_nested(fhp, I_MUTEX_PARENT);
1808 dentry = fhp->fh_dentry;
1809 dirp = dentry->d_inode;
1810
1811 rdentry = lookup_one_len(fname, dentry, flen);
1812 host_err = PTR_ERR(rdentry);
1813 if (IS_ERR(rdentry))
1814 goto out_nfserr;
1815
1816 if (!rdentry->d_inode) {
1817 dput(rdentry);
1818 err = nfserr_noent;
1819 goto out;
1820 }
1821
1822 if (!type)
1823 type = rdentry->d_inode->i_mode & S_IFMT;
1824
1825 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1826 if (host_err)
1827 goto out_put;
1828
1829 host_err = nfsd_break_lease(rdentry->d_inode);
1830 if (host_err)
1831 goto out_drop_write;
1832 if (type != S_IFDIR)
1833 host_err = vfs_unlink(dirp, rdentry);
1834 else
1835 host_err = vfs_rmdir(dirp, rdentry);
1836 if (!host_err)
1837 host_err = commit_metadata(fhp);
1838out_drop_write:
1839 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1840out_put:
1841 dput(rdentry);
1842
1843out_nfserr:
1844 err = nfserrno(host_err);
1845out:
1846 return err;
1847}
1848
1849
1850
1851
1852
1853
1854
1855
1856struct buffered_dirent {
1857 u64 ino;
1858 loff_t offset;
1859 int namlen;
1860 unsigned int d_type;
1861 char name[];
1862};
1863
1864struct readdir_data {
1865 char *dirent;
1866 size_t used;
1867 int full;
1868};
1869
1870static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
1871 loff_t offset, u64 ino, unsigned int d_type)
1872{
1873 struct readdir_data *buf = __buf;
1874 struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
1875 unsigned int reclen;
1876
1877 reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
1878 if (buf->used + reclen > PAGE_SIZE) {
1879 buf->full = 1;
1880 return -EINVAL;
1881 }
1882
1883 de->namlen = namlen;
1884 de->offset = offset;
1885 de->ino = ino;
1886 de->d_type = d_type;
1887 memcpy(de->name, name, namlen);
1888 buf->used += reclen;
1889
1890 return 0;
1891}
1892
1893static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
1894 struct readdir_cd *cdp, loff_t *offsetp)
1895{
1896 struct readdir_data buf;
1897 struct buffered_dirent *de;
1898 int host_err;
1899 int size;
1900 loff_t offset;
1901
1902 buf.dirent = (void *)__get_free_page(GFP_KERNEL);
1903 if (!buf.dirent)
1904 return nfserrno(-ENOMEM);
1905
1906 offset = *offsetp;
1907
1908 while (1) {
1909 struct inode *dir_inode = file->f_path.dentry->d_inode;
1910 unsigned int reclen;
1911
1912 cdp->err = nfserr_eof;
1913 buf.used = 0;
1914 buf.full = 0;
1915
1916 host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
1917 if (buf.full)
1918 host_err = 0;
1919
1920 if (host_err < 0)
1921 break;
1922
1923 size = buf.used;
1924
1925 if (!size)
1926 break;
1927
1928
1929
1930
1931
1932
1933 host_err = mutex_lock_killable(&dir_inode->i_mutex);
1934 if (host_err)
1935 break;
1936
1937 de = (struct buffered_dirent *)buf.dirent;
1938 while (size > 0) {
1939 offset = de->offset;
1940
1941 if (func(cdp, de->name, de->namlen, de->offset,
1942 de->ino, de->d_type))
1943 break;
1944
1945 if (cdp->err != nfs_ok)
1946 break;
1947
1948 reclen = ALIGN(sizeof(*de) + de->namlen,
1949 sizeof(u64));
1950 size -= reclen;
1951 de = (struct buffered_dirent *)((char *)de + reclen);
1952 }
1953 mutex_unlock(&dir_inode->i_mutex);
1954 if (size > 0)
1955 break;
1956
1957 offset = vfs_llseek(file, 0, SEEK_CUR);
1958 }
1959
1960 free_page((unsigned long)(buf.dirent));
1961
1962 if (host_err)
1963 return nfserrno(host_err);
1964
1965 *offsetp = offset;
1966 return cdp->err;
1967}
1968
1969
1970
1971
1972
1973__be32
1974nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1975 struct readdir_cd *cdp, filldir_t func)
1976{
1977 __be32 err;
1978 struct file *file;
1979 loff_t offset = *offsetp;
1980
1981 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
1982 if (err)
1983 goto out;
1984
1985 offset = vfs_llseek(file, offset, 0);
1986 if (offset < 0) {
1987 err = nfserrno((int)offset);
1988 goto out_close;
1989 }
1990
1991 err = nfsd_buffered_readdir(file, func, cdp, offsetp);
1992
1993 if (err == nfserr_eof || err == nfserr_toosmall)
1994 err = nfs_ok;
1995out_close:
1996 nfsd_close(file);
1997out:
1998 return err;
1999}
2000
2001
2002
2003
2004
2005__be32
2006nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
2007{
2008 __be32 err;
2009
2010 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
2011 if (!err) {
2012 struct path path = {
2013 .mnt = fhp->fh_export->ex_path.mnt,
2014 .dentry = fhp->fh_dentry,
2015 };
2016 if (vfs_statfs(&path, stat))
2017 err = nfserr_io;
2018 }
2019 return err;
2020}
2021
2022static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
2023{
2024 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
2025}
2026
2027
2028
2029
2030__be32
2031nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
2032 struct dentry *dentry, int acc)
2033{
2034 struct inode *inode = dentry->d_inode;
2035 int err;
2036
2037 if (acc == NFSD_MAY_NOP)
2038 return 0;
2039#if 0
2040 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2041 acc,
2042 (acc & NFSD_MAY_READ)? " read" : "",
2043 (acc & NFSD_MAY_WRITE)? " write" : "",
2044 (acc & NFSD_MAY_EXEC)? " exec" : "",
2045 (acc & NFSD_MAY_SATTR)? " sattr" : "",
2046 (acc & NFSD_MAY_TRUNC)? " trunc" : "",
2047 (acc & NFSD_MAY_LOCK)? " lock" : "",
2048 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
2049 inode->i_mode,
2050 IS_IMMUTABLE(inode)? " immut" : "",
2051 IS_APPEND(inode)? " append" : "",
2052 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
2053 dprintk(" owner %d/%d user %d/%d\n",
2054 inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
2055#endif
2056
2057
2058
2059
2060
2061 if (!(acc & NFSD_MAY_LOCAL_ACCESS))
2062 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
2063 if (exp_rdonly(rqstp, exp) ||
2064 __mnt_is_readonly(exp->ex_path.mnt))
2065 return nfserr_rofs;
2066 if ( IS_IMMUTABLE(inode))
2067 return nfserr_perm;
2068 }
2069 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
2070 return nfserr_perm;
2071
2072 if (acc & NFSD_MAY_LOCK) {
2073
2074
2075
2076
2077 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
2078 return 0;
2079 else
2080 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE;
2081 }
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096 if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
2097 inode->i_uid == current_fsuid())
2098 return 0;
2099
2100
2101 err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
2102
2103
2104 if (err == -EACCES && S_ISREG(inode->i_mode) &&
2105 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE))
2106 err = inode_permission(inode, MAY_EXEC);
2107
2108 return err? nfserrno(err) : 0;
2109}
2110
2111void
2112nfsd_racache_shutdown(void)
2113{
2114 struct raparms *raparm, *last_raparm;
2115 unsigned int i;
2116
2117 dprintk("nfsd: freeing readahead buffers.\n");
2118
2119 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2120 raparm = raparm_hash[i].pb_head;
2121 while(raparm) {
2122 last_raparm = raparm;
2123 raparm = raparm->p_next;
2124 kfree(last_raparm);
2125 }
2126 raparm_hash[i].pb_head = NULL;
2127 }
2128}
2129
2130
2131
2132int
2133nfsd_racache_init(int cache_size)
2134{
2135 int i;
2136 int j = 0;
2137 int nperbucket;
2138 struct raparms **raparm = NULL;
2139
2140
2141 if (raparm_hash[0].pb_head)
2142 return 0;
2143 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
2144 if (nperbucket < 2)
2145 nperbucket = 2;
2146 cache_size = nperbucket * RAPARM_HASH_SIZE;
2147
2148 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
2149
2150 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2151 spin_lock_init(&raparm_hash[i].pb_lock);
2152
2153 raparm = &raparm_hash[i].pb_head;
2154 for (j = 0; j < nperbucket; j++) {
2155 *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
2156 if (!*raparm)
2157 goto out_nomem;
2158 raparm = &(*raparm)->p_next;
2159 }
2160 *raparm = NULL;
2161 }
2162
2163 nfsdstats.ra_size = cache_size;
2164 return 0;
2165
2166out_nomem:
2167 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2168 nfsd_racache_shutdown();
2169 return -ENOMEM;
2170}
2171
2172#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2173struct posix_acl *
2174nfsd_get_posix_acl(struct svc_fh *fhp, int type)
2175{
2176 struct inode *inode = fhp->fh_dentry->d_inode;
2177 char *name;
2178 void *value = NULL;
2179 ssize_t size;
2180 struct posix_acl *acl;
2181
2182 if (!IS_POSIXACL(inode))
2183 return ERR_PTR(-EOPNOTSUPP);
2184
2185 switch (type) {
2186 case ACL_TYPE_ACCESS:
2187 name = POSIX_ACL_XATTR_ACCESS;
2188 break;
2189 case ACL_TYPE_DEFAULT:
2190 name = POSIX_ACL_XATTR_DEFAULT;
2191 break;
2192 default:
2193 return ERR_PTR(-EOPNOTSUPP);
2194 }
2195
2196 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
2197 if (size < 0)
2198 return ERR_PTR(size);
2199
2200 acl = posix_acl_from_xattr(value, size);
2201 kfree(value);
2202 return acl;
2203}
2204
2205int
2206nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2207{
2208 struct inode *inode = fhp->fh_dentry->d_inode;
2209 char *name;
2210 void *value = NULL;
2211 size_t size;
2212 int error;
2213
2214 if (!IS_POSIXACL(inode) ||
2215 !inode->i_op->setxattr || !inode->i_op->removexattr)
2216 return -EOPNOTSUPP;
2217 switch(type) {
2218 case ACL_TYPE_ACCESS:
2219 name = POSIX_ACL_XATTR_ACCESS;
2220 break;
2221 case ACL_TYPE_DEFAULT:
2222 name = POSIX_ACL_XATTR_DEFAULT;
2223 break;
2224 default:
2225 return -EOPNOTSUPP;
2226 }
2227
2228 if (acl && acl->a_count) {
2229 size = posix_acl_xattr_size(acl->a_count);
2230 value = kmalloc(size, GFP_KERNEL);
2231 if (!value)
2232 return -ENOMEM;
2233 error = posix_acl_to_xattr(acl, value, size);
2234 if (error < 0)
2235 goto getout;
2236 size = error;
2237 } else
2238 size = 0;
2239
2240 error = mnt_want_write(fhp->fh_export->ex_path.mnt);
2241 if (error)
2242 goto getout;
2243 if (size)
2244 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2245 else {
2246 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2247 error = 0;
2248 else {
2249 error = vfs_removexattr(fhp->fh_dentry, name);
2250 if (error == -ENODATA)
2251 error = 0;
2252 }
2253 }
2254 mnt_drop_write(fhp->fh_export->ex_path.mnt);
2255
2256getout:
2257 kfree(value);
2258 return error;
2259}
2260#endif
2261