1#define MSNFS
2
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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/splice.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
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
57#include <linux/jhash.h>
58#include <linux/ima.h>
59
60#include <asm/uaccess.h>
61
62#define NFSDDBG_FACILITY NFSDDBG_FILEOP
63
64
65
66
67
68
69
70
71
72struct raparms {
73 struct raparms *p_next;
74 unsigned int p_count;
75 ino_t p_ino;
76 dev_t p_dev;
77 int p_set;
78 struct file_ra_state p_ra;
79 unsigned int p_hindex;
80};
81
82struct raparm_hbucket {
83 struct raparms *pb_head;
84 spinlock_t pb_lock;
85} ____cacheline_aligned_in_smp;
86
87#define RAPARM_HASH_BITS 4
88#define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
89#define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
90static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
91
92static inline int
93nfsd_v4client(struct svc_rqst *rq)
94{
95 return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
96}
97
98
99
100
101
102
103
104int
105nfsd_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 path path = {.mnt = mntget(exp->ex_path.mnt),
111 .dentry = dget(dentry)};
112 int err = 0;
113
114 while (d_mountpoint(path.dentry) && follow_down(&path))
115 ;
116
117 exp2 = rqst_exp_get_by_name(rqstp, &path);
118 if (IS_ERR(exp2)) {
119 if (PTR_ERR(exp2) != -ENOENT)
120 err = PTR_ERR(exp2);
121 path_put(&path);
122 goto out;
123 }
124 if (nfsd_v4client(rqstp) ||
125 (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
126
127
128
129
130
131
132
133 *dpp = path.dentry;
134 path.dentry = dentry;
135 *expp = exp2;
136 exp2 = exp;
137 }
138 path_put(&path);
139 exp_put(exp2);
140out:
141 return err;
142}
143
144__be32
145nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
146 const char *name, unsigned int len,
147 struct svc_export **exp_ret, struct dentry **dentry_ret)
148{
149 struct svc_export *exp;
150 struct dentry *dparent;
151 struct dentry *dentry;
152 __be32 err;
153 int host_err;
154
155 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
156
157
158 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
159 if (err)
160 return err;
161
162 dparent = fhp->fh_dentry;
163 exp = fhp->fh_export;
164 exp_get(exp);
165
166
167 if (isdotent(name, len)) {
168 if (len==1)
169 dentry = dget(dparent);
170 else if (dparent != exp->ex_path.dentry)
171 dentry = dget_parent(dparent);
172 else if (!EX_NOHIDE(exp))
173 dentry = dget(dparent);
174 else {
175
176 struct svc_export *exp2 = NULL;
177 struct dentry *dp;
178 struct path path = {.mnt = mntget(exp->ex_path.mnt),
179 .dentry = dget(dparent)};
180
181 while (path.dentry == path.mnt->mnt_root &&
182 follow_up(&path))
183 ;
184 dp = dget_parent(path.dentry);
185 dput(path.dentry);
186 path.dentry = dp;
187
188 exp2 = rqst_exp_parent(rqstp, &path);
189 if (PTR_ERR(exp2) == -ENOENT) {
190 dentry = dget(dparent);
191 } else if (IS_ERR(exp2)) {
192 host_err = PTR_ERR(exp2);
193 path_put(&path);
194 goto out_nfserr;
195 } else {
196 dentry = dget(path.dentry);
197 exp_put(exp);
198 exp = exp2;
199 }
200 path_put(&path);
201 }
202 } else {
203 fh_lock(fhp);
204 dentry = lookup_one_len(name, dparent, len);
205 host_err = PTR_ERR(dentry);
206 if (IS_ERR(dentry))
207 goto out_nfserr;
208
209
210
211 if (d_mountpoint(dentry)) {
212 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
213 dput(dentry);
214 goto out_nfserr;
215 }
216 }
217 }
218 *dentry_ret = dentry;
219 *exp_ret = exp;
220 return 0;
221
222out_nfserr:
223 exp_put(exp);
224 return nfserrno(host_err);
225}
226
227
228
229
230
231
232
233
234
235
236
237
238
239__be32
240nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
241 unsigned int len, struct svc_fh *resfh)
242{
243 struct svc_export *exp;
244 struct dentry *dentry;
245 __be32 err;
246
247 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
248 if (err)
249 return err;
250 err = check_nfsd_access(exp, rqstp);
251 if (err)
252 goto out;
253
254
255
256
257 err = fh_compose(resfh, exp, dentry, fhp);
258 if (!err && !dentry->d_inode)
259 err = nfserr_noent;
260out:
261 dput(dentry);
262 exp_put(exp);
263 return err;
264}
265
266
267
268
269
270
271__be32
272nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
273 int check_guard, time_t guardtime)
274{
275 struct dentry *dentry;
276 struct inode *inode;
277 int accmode = NFSD_MAY_SATTR;
278 int ftype = 0;
279 __be32 err;
280 int host_err;
281 int size_change = 0;
282
283 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
284 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
285 if (iap->ia_valid & ATTR_SIZE)
286 ftype = S_IFREG;
287
288
289 err = fh_verify(rqstp, fhp, ftype, accmode);
290 if (err)
291 goto out;
292
293 dentry = fhp->fh_dentry;
294 inode = dentry->d_inode;
295
296
297 if (S_ISLNK(inode->i_mode))
298 iap->ia_valid &= ~ATTR_MODE;
299
300 if (!iap->ia_valid)
301 goto out;
302
303
304
305
306
307
308
309
310
311
312
313
314
315#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
316#define MAX_TOUCH_TIME_ERROR (30*60)
317 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
318 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
319
320
321
322
323
324
325
326 time_t delta = iap->ia_atime.tv_sec - get_seconds();
327 if (delta < 0)
328 delta = -delta;
329 if (delta < MAX_TOUCH_TIME_ERROR &&
330 inode_change_ok(inode, iap) != 0) {
331
332
333
334
335
336 iap->ia_valid &= ~BOTH_TIME_SET;
337 }
338 }
339
340
341
342
343
344 if (iap->ia_valid & ATTR_SIZE) {
345 if (iap->ia_size < inode->i_size) {
346 err = nfsd_permission(rqstp, fhp->fh_export, dentry,
347 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
348 if (err)
349 goto out;
350 }
351
352
353
354
355
356 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
357 if (host_err == -EWOULDBLOCK)
358 host_err = -ETIMEDOUT;
359 if (host_err)
360 goto out_nfserr;
361
362 host_err = get_write_access(inode);
363 if (host_err)
364 goto out_nfserr;
365
366 size_change = 1;
367 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
368 if (host_err) {
369 put_write_access(inode);
370 goto out_nfserr;
371 }
372 vfs_dq_init(inode);
373 }
374
375
376 if (iap->ia_valid & ATTR_MODE) {
377 iap->ia_mode &= S_IALLUGO;
378 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
379 }
380
381
382 if (!S_ISDIR(inode->i_mode) &&
383 (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
384 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
385 iap->ia_valid |= ATTR_KILL_PRIV;
386 if (iap->ia_valid & ATTR_MODE) {
387
388 iap->ia_mode &= ~S_ISUID;
389 if (iap->ia_mode & S_IXGRP)
390 iap->ia_mode &= ~S_ISGID;
391 } else {
392
393 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
394 }
395 }
396
397
398
399 iap->ia_valid |= ATTR_CTIME;
400
401 err = nfserr_notsync;
402 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
403 fh_lock(fhp);
404 host_err = notify_change(dentry, iap);
405 err = nfserrno(host_err);
406 fh_unlock(fhp);
407 }
408 if (size_change)
409 put_write_access(inode);
410 if (!err)
411 if (EX_ISSYNC(fhp->fh_export))
412 write_inode_now(inode, 1);
413out:
414 return err;
415
416out_nfserr:
417 err = nfserrno(host_err);
418 goto out;
419}
420
421#if defined(CONFIG_NFSD_V2_ACL) || \
422 defined(CONFIG_NFSD_V3_ACL) || \
423 defined(CONFIG_NFSD_V4)
424static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
425{
426 ssize_t buflen;
427 ssize_t ret;
428
429 buflen = vfs_getxattr(dentry, key, NULL, 0);
430 if (buflen <= 0)
431 return buflen;
432
433 *buf = kmalloc(buflen, GFP_KERNEL);
434 if (!*buf)
435 return -ENOMEM;
436
437 ret = vfs_getxattr(dentry, key, *buf, buflen);
438 if (ret < 0)
439 kfree(*buf);
440 return ret;
441}
442#endif
443
444#if defined(CONFIG_NFSD_V4)
445static int
446set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
447{
448 int len;
449 size_t buflen;
450 char *buf = NULL;
451 int error = 0;
452
453 buflen = posix_acl_xattr_size(pacl->a_count);
454 buf = kmalloc(buflen, GFP_KERNEL);
455 error = -ENOMEM;
456 if (buf == NULL)
457 goto out;
458
459 len = posix_acl_to_xattr(pacl, buf, buflen);
460 if (len < 0) {
461 error = len;
462 goto out;
463 }
464
465 error = vfs_setxattr(dentry, key, buf, len, 0);
466out:
467 kfree(buf);
468 return error;
469}
470
471__be32
472nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
473 struct nfs4_acl *acl)
474{
475 __be32 error;
476 int host_error;
477 struct dentry *dentry;
478 struct inode *inode;
479 struct posix_acl *pacl = NULL, *dpacl = NULL;
480 unsigned int flags = 0;
481
482
483 error = fh_verify(rqstp, fhp, 0 , NFSD_MAY_SATTR);
484 if (error)
485 return error;
486
487 dentry = fhp->fh_dentry;
488 inode = dentry->d_inode;
489 if (S_ISDIR(inode->i_mode))
490 flags = NFS4_ACL_DIR;
491
492 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
493 if (host_error == -EINVAL) {
494 return nfserr_attrnotsupp;
495 } else if (host_error < 0)
496 goto out_nfserr;
497
498 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
499 if (host_error < 0)
500 goto out_release;
501
502 if (S_ISDIR(inode->i_mode))
503 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
504
505out_release:
506 posix_acl_release(pacl);
507 posix_acl_release(dpacl);
508out_nfserr:
509 if (host_error == -EOPNOTSUPP)
510 return nfserr_attrnotsupp;
511 else
512 return nfserrno(host_error);
513}
514
515static struct posix_acl *
516_get_posix_acl(struct dentry *dentry, char *key)
517{
518 void *buf = NULL;
519 struct posix_acl *pacl = NULL;
520 int buflen;
521
522 buflen = nfsd_getxattr(dentry, key, &buf);
523 if (!buflen)
524 buflen = -ENODATA;
525 if (buflen <= 0)
526 return ERR_PTR(buflen);
527
528 pacl = posix_acl_from_xattr(buf, buflen);
529 kfree(buf);
530 return pacl;
531}
532
533int
534nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
535{
536 struct inode *inode = dentry->d_inode;
537 int error = 0;
538 struct posix_acl *pacl = NULL, *dpacl = NULL;
539 unsigned int flags = 0;
540
541 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
542 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
543 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
544 if (IS_ERR(pacl)) {
545 error = PTR_ERR(pacl);
546 pacl = NULL;
547 goto out;
548 }
549
550 if (S_ISDIR(inode->i_mode)) {
551 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
552 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
553 dpacl = NULL;
554 else if (IS_ERR(dpacl)) {
555 error = PTR_ERR(dpacl);
556 dpacl = NULL;
557 goto out;
558 }
559 flags = NFS4_ACL_DIR;
560 }
561
562 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
563 if (IS_ERR(*acl)) {
564 error = PTR_ERR(*acl);
565 *acl = NULL;
566 }
567 out:
568 posix_acl_release(pacl);
569 posix_acl_release(dpacl);
570 return error;
571}
572
573#endif
574
575#ifdef CONFIG_NFSD_V3
576
577
578
579struct accessmap {
580 u32 access;
581 int how;
582};
583static struct accessmap nfs3_regaccess[] = {
584 { NFS3_ACCESS_READ, NFSD_MAY_READ },
585 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
586 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
587 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
588
589 { 0, 0 }
590};
591
592static struct accessmap nfs3_diraccess[] = {
593 { NFS3_ACCESS_READ, NFSD_MAY_READ },
594 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
595 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
596 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
597 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
598
599 { 0, 0 }
600};
601
602static struct accessmap nfs3_anyaccess[] = {
603
604
605
606
607
608
609
610 { NFS3_ACCESS_READ, NFSD_MAY_READ },
611 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
612 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
613 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
614
615 { 0, 0 }
616};
617
618__be32
619nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
620{
621 struct accessmap *map;
622 struct svc_export *export;
623 struct dentry *dentry;
624 u32 query, result = 0, sresult = 0;
625 __be32 error;
626
627 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
628 if (error)
629 goto out;
630
631 export = fhp->fh_export;
632 dentry = fhp->fh_dentry;
633
634 if (S_ISREG(dentry->d_inode->i_mode))
635 map = nfs3_regaccess;
636 else if (S_ISDIR(dentry->d_inode->i_mode))
637 map = nfs3_diraccess;
638 else
639 map = nfs3_anyaccess;
640
641
642 query = *access;
643 for (; map->access; map++) {
644 if (map->access & query) {
645 __be32 err2;
646
647 sresult |= map->access;
648
649 err2 = nfsd_permission(rqstp, export, dentry, map->how);
650 switch (err2) {
651 case nfs_ok:
652 result |= map->access;
653 break;
654
655
656
657 case nfserr_rofs:
658 case nfserr_acces:
659 case nfserr_perm:
660
661 break;
662 default:
663 error = err2;
664 goto out;
665 }
666 }
667 }
668 *access = result;
669 if (supported)
670 *supported = sresult;
671
672 out:
673 return error;
674}
675#endif
676
677
678
679
680
681
682
683
684__be32
685nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
686 int access, struct file **filp)
687{
688 struct dentry *dentry;
689 struct inode *inode;
690 int flags = O_RDONLY|O_LARGEFILE;
691 __be32 err;
692 int host_err;
693
694 validate_process_creds();
695
696
697
698
699
700
701 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
702 if (err)
703 goto out;
704
705 dentry = fhp->fh_dentry;
706 inode = dentry->d_inode;
707
708
709
710
711 err = nfserr_perm;
712 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE))
713 goto out;
714
715
716
717
718
719 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
720 goto out;
721
722 if (!inode->i_fop)
723 goto out;
724
725
726
727
728
729 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0));
730 if (host_err == -EWOULDBLOCK)
731 host_err = -ETIMEDOUT;
732 if (host_err)
733 goto out_nfserr;
734
735 if (access & NFSD_MAY_WRITE) {
736 if (access & NFSD_MAY_READ)
737 flags = O_RDWR|O_LARGEFILE;
738 else
739 flags = O_WRONLY|O_LARGEFILE;
740
741 vfs_dq_init(inode);
742 }
743 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
744 flags, current_cred());
745 if (IS_ERR(*filp))
746 host_err = PTR_ERR(*filp);
747 else
748 ima_counts_get(*filp);
749out_nfserr:
750 err = nfserrno(host_err);
751out:
752 validate_process_creds();
753 return err;
754}
755
756
757
758
759void
760nfsd_close(struct file *filp)
761{
762 fput(filp);
763}
764
765
766
767
768
769
770static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
771 const struct file_operations *fop)
772{
773 struct inode *inode = dp->d_inode;
774 int (*fsync) (struct file *, struct dentry *, int);
775 int err;
776
777 err = filemap_fdatawrite(inode->i_mapping);
778 if (err == 0 && fop && (fsync = fop->fsync))
779 err = fsync(filp, dp, 0);
780 if (err == 0)
781 err = filemap_fdatawait(inode->i_mapping);
782
783 return err;
784}
785
786static int
787nfsd_sync(struct file *filp)
788{
789 int err;
790 struct inode *inode = filp->f_path.dentry->d_inode;
791 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
792 mutex_lock(&inode->i_mutex);
793 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
794 mutex_unlock(&inode->i_mutex);
795
796 return err;
797}
798
799int
800nfsd_sync_dir(struct dentry *dp)
801{
802 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
803}
804
805
806
807
808
809
810static inline struct raparms *
811nfsd_get_raparms(dev_t dev, ino_t ino)
812{
813 struct raparms *ra, **rap, **frap = NULL;
814 int depth = 0;
815 unsigned int hash;
816 struct raparm_hbucket *rab;
817
818 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
819 rab = &raparm_hash[hash];
820
821 spin_lock(&rab->pb_lock);
822 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
823 if (ra->p_ino == ino && ra->p_dev == dev)
824 goto found;
825 depth++;
826 if (ra->p_count == 0)
827 frap = rap;
828 }
829 depth = nfsdstats.ra_size*11/10;
830 if (!frap) {
831 spin_unlock(&rab->pb_lock);
832 return NULL;
833 }
834 rap = frap;
835 ra = *frap;
836 ra->p_dev = dev;
837 ra->p_ino = ino;
838 ra->p_set = 0;
839 ra->p_hindex = hash;
840found:
841 if (rap != &rab->pb_head) {
842 *rap = ra->p_next;
843 ra->p_next = rab->pb_head;
844 rab->pb_head = ra;
845 }
846 ra->p_count++;
847 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
848 spin_unlock(&rab->pb_lock);
849 return ra;
850}
851
852
853
854
855
856
857static int
858nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
859 struct splice_desc *sd)
860{
861 struct svc_rqst *rqstp = sd->u.data;
862 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
863 struct page *page = buf->page;
864 size_t size;
865 int ret;
866
867 ret = buf->ops->confirm(pipe, buf);
868 if (unlikely(ret))
869 return ret;
870
871 size = sd->len;
872
873 if (rqstp->rq_res.page_len == 0) {
874 get_page(page);
875 put_page(*pp);
876 *pp = page;
877 rqstp->rq_resused++;
878 rqstp->rq_res.page_base = buf->offset;
879 rqstp->rq_res.page_len = size;
880 } else if (page != pp[-1]) {
881 get_page(page);
882 if (*pp)
883 put_page(*pp);
884 *pp = page;
885 rqstp->rq_resused++;
886 rqstp->rq_res.page_len += size;
887 } else
888 rqstp->rq_res.page_len += size;
889
890 return size;
891}
892
893static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
894 struct splice_desc *sd)
895{
896 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
897}
898
899static inline int svc_msnfs(struct svc_fh *ffhp)
900{
901#ifdef MSNFS
902 return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
903#else
904 return 0;
905#endif
906}
907
908static __be32
909nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
910 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
911{
912 struct inode *inode;
913 struct raparms *ra;
914 mm_segment_t oldfs;
915 __be32 err;
916 int host_err;
917
918 err = nfserr_perm;
919 inode = file->f_path.dentry->d_inode;
920
921 if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
922 goto out;
923
924
925 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
926
927 if (ra && ra->p_set)
928 file->f_ra = ra->p_ra;
929
930 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
931 struct splice_desc sd = {
932 .len = 0,
933 .total_len = *count,
934 .pos = offset,
935 .u.data = rqstp,
936 };
937
938 rqstp->rq_resused = 1;
939 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
940 } else {
941 oldfs = get_fs();
942 set_fs(KERNEL_DS);
943 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
944 set_fs(oldfs);
945 }
946
947
948 if (ra) {
949 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
950 spin_lock(&rab->pb_lock);
951 ra->p_ra = file->f_ra;
952 ra->p_set = 1;
953 ra->p_count--;
954 spin_unlock(&rab->pb_lock);
955 }
956
957 if (host_err >= 0) {
958 nfsdstats.io_read += host_err;
959 *count = host_err;
960 err = 0;
961 fsnotify_access(file->f_path.dentry);
962 } else
963 err = nfserrno(host_err);
964out:
965 return err;
966}
967
968static void kill_suid(struct dentry *dentry)
969{
970 struct iattr ia;
971 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
972
973 mutex_lock(&dentry->d_inode->i_mutex);
974 notify_change(dentry, &ia);
975 mutex_unlock(&dentry->d_inode->i_mutex);
976}
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992static int wait_for_concurrent_writes(struct file *file)
993{
994 struct inode *inode = file->f_path.dentry->d_inode;
995 static ino_t last_ino;
996 static dev_t last_dev;
997 int err = 0;
998
999 if (atomic_read(&inode->i_writecount) > 1
1000 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
1001 dprintk("nfsd: write defer %d\n", task_pid_nr(current));
1002 msleep(10);
1003 dprintk("nfsd: write resume %d\n", task_pid_nr(current));
1004 }
1005
1006 if (inode->i_state & I_DIRTY) {
1007 dprintk("nfsd: write sync %d\n", task_pid_nr(current));
1008 err = nfsd_sync(file);
1009 }
1010 last_ino = inode->i_ino;
1011 last_dev = inode->i_sb->s_dev;
1012 return err;
1013}
1014
1015static __be32
1016nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1017 loff_t offset, struct kvec *vec, int vlen,
1018 unsigned long *cnt, int *stablep)
1019{
1020 struct svc_export *exp;
1021 struct dentry *dentry;
1022 struct inode *inode;
1023 mm_segment_t oldfs;
1024 __be32 err = 0;
1025 int host_err;
1026 int stable = *stablep;
1027 int use_wgather;
1028
1029#ifdef MSNFS
1030 err = nfserr_perm;
1031
1032 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1033 (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt)))
1034 goto out;
1035#endif
1036
1037 dentry = file->f_path.dentry;
1038 inode = dentry->d_inode;
1039 exp = fhp->fh_export;
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049 use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
1050
1051 if (!file->f_op->fsync) {
1052 stable = 2;
1053 *stablep = 2;
1054 }
1055
1056 if (!EX_ISSYNC(exp))
1057 stable = 0;
1058 if (stable && !use_wgather) {
1059 spin_lock(&file->f_lock);
1060 file->f_flags |= O_SYNC;
1061 spin_unlock(&file->f_lock);
1062 }
1063
1064
1065 oldfs = get_fs(); set_fs(KERNEL_DS);
1066 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
1067 set_fs(oldfs);
1068 if (host_err < 0)
1069 goto out_nfserr;
1070 *cnt = host_err;
1071 nfsdstats.io_write += host_err;
1072 fsnotify_modify(file->f_path.dentry);
1073
1074
1075 if (inode->i_mode & (S_ISUID | S_ISGID))
1076 kill_suid(dentry);
1077
1078 if (stable && use_wgather)
1079 host_err = wait_for_concurrent_writes(file);
1080
1081out_nfserr:
1082 dprintk("nfsd: write complete host_err=%d\n", host_err);
1083 if (host_err >= 0)
1084 err = 0;
1085 else
1086 err = nfserrno(host_err);
1087out:
1088 return err;
1089}
1090
1091
1092
1093
1094
1095
1096__be32
1097nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1098 loff_t offset, struct kvec *vec, int vlen,
1099 unsigned long *count)
1100{
1101 __be32 err;
1102
1103 if (file) {
1104 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1105 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
1106 if (err)
1107 goto out;
1108 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1109 } else {
1110 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
1111 if (err)
1112 goto out;
1113 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1114 nfsd_close(file);
1115 }
1116out:
1117 return err;
1118}
1119
1120
1121
1122
1123
1124
1125__be32
1126nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1127 loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
1128 int *stablep)
1129{
1130 __be32 err = 0;
1131
1132 if (file) {
1133 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1134 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
1135 if (err)
1136 goto out;
1137 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1138 stablep);
1139 } else {
1140 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1141 if (err)
1142 goto out;
1143
1144 if (cnt)
1145 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1146 cnt, stablep);
1147 nfsd_close(file);
1148 }
1149out:
1150 return err;
1151}
1152
1153#ifdef CONFIG_NFSD_V3
1154
1155
1156
1157
1158
1159
1160
1161
1162__be32
1163nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1164 loff_t offset, unsigned long count)
1165{
1166 struct file *file;
1167 __be32 err;
1168
1169 if ((u64)count > ~(u64)offset)
1170 return nfserr_inval;
1171
1172 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1173 if (err)
1174 return err;
1175 if (EX_ISSYNC(fhp->fh_export)) {
1176 if (file->f_op && file->f_op->fsync) {
1177 err = nfserrno(nfsd_sync(file));
1178 } else {
1179 err = nfserr_notsupp;
1180 }
1181 }
1182
1183 nfsd_close(file);
1184 return err;
1185}
1186#endif
1187
1188static __be32
1189nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
1190 struct iattr *iap)
1191{
1192
1193
1194
1195 iap->ia_valid &= ~ATTR_MODE;
1196
1197
1198
1199
1200
1201 if (current_fsuid() != 0)
1202 iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
1203 if (iap->ia_valid)
1204 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1205 return 0;
1206}
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216static void
1217nfsd_check_ignore_resizing(struct iattr *iap)
1218{
1219 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
1220 iap->ia_valid &= ~ATTR_SIZE;
1221}
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231__be32
1232nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1233 char *fname, int flen, struct iattr *iap,
1234 int type, dev_t rdev, struct svc_fh *resfhp)
1235{
1236 struct dentry *dentry, *dchild = NULL;
1237 struct inode *dirp;
1238 __be32 err;
1239 __be32 err2;
1240 int host_err;
1241
1242 err = nfserr_perm;
1243 if (!flen)
1244 goto out;
1245 err = nfserr_exist;
1246 if (isdotent(fname, flen))
1247 goto out;
1248
1249 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1250 if (err)
1251 goto out;
1252
1253 dentry = fhp->fh_dentry;
1254 dirp = dentry->d_inode;
1255
1256 err = nfserr_notdir;
1257 if (!dirp->i_op->lookup)
1258 goto out;
1259
1260
1261
1262
1263 if (!resfhp->fh_dentry) {
1264
1265 fh_lock_nested(fhp, I_MUTEX_PARENT);
1266 dchild = lookup_one_len(fname, dentry, flen);
1267 host_err = PTR_ERR(dchild);
1268 if (IS_ERR(dchild))
1269 goto out_nfserr;
1270 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1271 if (err)
1272 goto out;
1273 } else {
1274
1275 dchild = dget(resfhp->fh_dentry);
1276 if (!fhp->fh_locked) {
1277
1278 printk(KERN_ERR
1279 "nfsd_create: parent %s/%s not locked!\n",
1280 dentry->d_parent->d_name.name,
1281 dentry->d_name.name);
1282 err = nfserr_io;
1283 goto out;
1284 }
1285 }
1286
1287
1288
1289 err = nfserr_exist;
1290 if (dchild->d_inode) {
1291 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1292 dentry->d_name.name, dchild->d_name.name);
1293 goto out;
1294 }
1295
1296 if (!(iap->ia_valid & ATTR_MODE))
1297 iap->ia_mode = 0;
1298 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1299
1300 err = nfserr_inval;
1301 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
1302 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
1303 type);
1304 goto out;
1305 }
1306
1307 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1308 if (host_err)
1309 goto out_nfserr;
1310
1311
1312
1313
1314 err = 0;
1315 switch (type) {
1316 case S_IFREG:
1317 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1318 if (!host_err)
1319 nfsd_check_ignore_resizing(iap);
1320 break;
1321 case S_IFDIR:
1322 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1323 break;
1324 case S_IFCHR:
1325 case S_IFBLK:
1326 case S_IFIFO:
1327 case S_IFSOCK:
1328 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1329 break;
1330 }
1331 if (host_err < 0) {
1332 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1333 goto out_nfserr;
1334 }
1335
1336 if (EX_ISSYNC(fhp->fh_export)) {
1337 err = nfserrno(nfsd_sync_dir(dentry));
1338 write_inode_now(dchild->d_inode, 1);
1339 }
1340
1341 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1342 if (err2)
1343 err = err2;
1344 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1345
1346
1347
1348 if (!err)
1349 err = fh_update(resfhp);
1350out:
1351 if (dchild && !IS_ERR(dchild))
1352 dput(dchild);
1353 return err;
1354
1355out_nfserr:
1356 err = nfserrno(host_err);
1357 goto out;
1358}
1359
1360#ifdef CONFIG_NFSD_V3
1361
1362
1363
1364__be32
1365nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1366 char *fname, int flen, struct iattr *iap,
1367 struct svc_fh *resfhp, int createmode, u32 *verifier,
1368 int *truncp, int *created)
1369{
1370 struct dentry *dentry, *dchild = NULL;
1371 struct inode *dirp;
1372 __be32 err;
1373 __be32 err2;
1374 int host_err;
1375 __u32 v_mtime=0, v_atime=0;
1376
1377 err = nfserr_perm;
1378 if (!flen)
1379 goto out;
1380 err = nfserr_exist;
1381 if (isdotent(fname, flen))
1382 goto out;
1383 if (!(iap->ia_valid & ATTR_MODE))
1384 iap->ia_mode = 0;
1385 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1386 if (err)
1387 goto out;
1388
1389 dentry = fhp->fh_dentry;
1390 dirp = dentry->d_inode;
1391
1392
1393
1394 err = nfserr_notdir;
1395 if (!dirp->i_op->lookup)
1396 goto out;
1397 fh_lock_nested(fhp, I_MUTEX_PARENT);
1398
1399
1400
1401
1402 dchild = lookup_one_len(fname, dentry, flen);
1403 host_err = PTR_ERR(dchild);
1404 if (IS_ERR(dchild))
1405 goto out_nfserr;
1406
1407 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1408 if (err)
1409 goto out;
1410
1411 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1412
1413
1414
1415
1416
1417
1418 v_mtime = verifier[0]&0x7fffffff;
1419 v_atime = verifier[1]&0x7fffffff;
1420 }
1421
1422 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1423 if (host_err)
1424 goto out_nfserr;
1425 if (dchild->d_inode) {
1426 err = 0;
1427
1428 switch (createmode) {
1429 case NFS3_CREATE_UNCHECKED:
1430 if (! S_ISREG(dchild->d_inode->i_mode))
1431 err = nfserr_exist;
1432 else if (truncp) {
1433
1434
1435
1436
1437
1438
1439
1440 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1441 }
1442 else {
1443 iap->ia_valid &= ATTR_SIZE;
1444 goto set_attr;
1445 }
1446 break;
1447 case NFS3_CREATE_EXCLUSIVE:
1448 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1449 && dchild->d_inode->i_atime.tv_sec == v_atime
1450 && dchild->d_inode->i_size == 0 )
1451 break;
1452
1453 case NFS3_CREATE_GUARDED:
1454 err = nfserr_exist;
1455 }
1456 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1457 goto out;
1458 }
1459
1460 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1461 if (host_err < 0) {
1462 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1463 goto out_nfserr;
1464 }
1465 if (created)
1466 *created = 1;
1467
1468 if (EX_ISSYNC(fhp->fh_export)) {
1469 err = nfserrno(nfsd_sync_dir(dentry));
1470
1471 }
1472
1473 nfsd_check_ignore_resizing(iap);
1474
1475 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1476
1477 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1478 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1479
1480 iap->ia_mtime.tv_sec = v_mtime;
1481 iap->ia_atime.tv_sec = v_atime;
1482 iap->ia_mtime.tv_nsec = 0;
1483 iap->ia_atime.tv_nsec = 0;
1484 }
1485
1486 set_attr:
1487 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1488 if (err2)
1489 err = err2;
1490
1491 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1492
1493
1494
1495 if (!err)
1496 err = fh_update(resfhp);
1497
1498 out:
1499 fh_unlock(fhp);
1500 if (dchild && !IS_ERR(dchild))
1501 dput(dchild);
1502 return err;
1503
1504 out_nfserr:
1505 err = nfserrno(host_err);
1506 goto out;
1507}
1508#endif
1509
1510
1511
1512
1513
1514
1515__be32
1516nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1517{
1518 struct dentry *dentry;
1519 struct inode *inode;
1520 mm_segment_t oldfs;
1521 __be32 err;
1522 int host_err;
1523
1524 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
1525 if (err)
1526 goto out;
1527
1528 dentry = fhp->fh_dentry;
1529 inode = dentry->d_inode;
1530
1531 err = nfserr_inval;
1532 if (!inode->i_op->readlink)
1533 goto out;
1534
1535 touch_atime(fhp->fh_export->ex_path.mnt, dentry);
1536
1537
1538
1539
1540 oldfs = get_fs(); set_fs(KERNEL_DS);
1541 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1542 set_fs(oldfs);
1543
1544 if (host_err < 0)
1545 goto out_nfserr;
1546 *lenp = host_err;
1547 err = 0;
1548out:
1549 return err;
1550
1551out_nfserr:
1552 err = nfserrno(host_err);
1553 goto out;
1554}
1555
1556
1557
1558
1559
1560__be32
1561nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1562 char *fname, int flen,
1563 char *path, int plen,
1564 struct svc_fh *resfhp,
1565 struct iattr *iap)
1566{
1567 struct dentry *dentry, *dnew;
1568 __be32 err, cerr;
1569 int host_err;
1570
1571 err = nfserr_noent;
1572 if (!flen || !plen)
1573 goto out;
1574 err = nfserr_exist;
1575 if (isdotent(fname, flen))
1576 goto out;
1577
1578 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1579 if (err)
1580 goto out;
1581 fh_lock(fhp);
1582 dentry = fhp->fh_dentry;
1583 dnew = lookup_one_len(fname, dentry, flen);
1584 host_err = PTR_ERR(dnew);
1585 if (IS_ERR(dnew))
1586 goto out_nfserr;
1587
1588 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1589 if (host_err)
1590 goto out_nfserr;
1591
1592 if (unlikely(path[plen] != 0)) {
1593 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1594 if (path_alloced == NULL)
1595 host_err = -ENOMEM;
1596 else {
1597 strncpy(path_alloced, path, plen);
1598 path_alloced[plen] = 0;
1599 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
1600 kfree(path_alloced);
1601 }
1602 } else
1603 host_err = vfs_symlink(dentry->d_inode, dnew, path);
1604
1605 if (!host_err) {
1606 if (EX_ISSYNC(fhp->fh_export))
1607 host_err = nfsd_sync_dir(dentry);
1608 }
1609 err = nfserrno(host_err);
1610 fh_unlock(fhp);
1611
1612 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1613
1614 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1615 dput(dnew);
1616 if (err==0) err = cerr;
1617out:
1618 return err;
1619
1620out_nfserr:
1621 err = nfserrno(host_err);
1622 goto out;
1623}
1624
1625
1626
1627
1628
1629__be32
1630nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1631 char *name, int len, struct svc_fh *tfhp)
1632{
1633 struct dentry *ddir, *dnew, *dold;
1634 struct inode *dirp, *dest;
1635 __be32 err;
1636 int host_err;
1637
1638 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
1639 if (err)
1640 goto out;
1641 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
1642 if (err)
1643 goto out;
1644
1645 err = nfserr_perm;
1646 if (!len)
1647 goto out;
1648 err = nfserr_exist;
1649 if (isdotent(name, len))
1650 goto out;
1651
1652 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1653 ddir = ffhp->fh_dentry;
1654 dirp = ddir->d_inode;
1655
1656 dnew = lookup_one_len(name, ddir, len);
1657 host_err = PTR_ERR(dnew);
1658 if (IS_ERR(dnew))
1659 goto out_nfserr;
1660
1661 dold = tfhp->fh_dentry;
1662 dest = dold->d_inode;
1663
1664 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
1665 if (host_err) {
1666 err = nfserrno(host_err);
1667 goto out_dput;
1668 }
1669 host_err = vfs_link(dold, dirp, dnew);
1670 if (!host_err) {
1671 if (EX_ISSYNC(ffhp->fh_export)) {
1672 err = nfserrno(nfsd_sync_dir(ddir));
1673 write_inode_now(dest, 1);
1674 }
1675 err = 0;
1676 } else {
1677 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1678 err = nfserr_acces;
1679 else
1680 err = nfserrno(host_err);
1681 }
1682 mnt_drop_write(tfhp->fh_export->ex_path.mnt);
1683out_dput:
1684 dput(dnew);
1685out_unlock:
1686 fh_unlock(ffhp);
1687out:
1688 return err;
1689
1690out_nfserr:
1691 err = nfserrno(host_err);
1692 goto out_unlock;
1693}
1694
1695
1696
1697
1698
1699__be32
1700nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1701 struct svc_fh *tfhp, char *tname, int tlen)
1702{
1703 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1704 struct inode *fdir, *tdir;
1705 __be32 err;
1706 int host_err;
1707
1708 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
1709 if (err)
1710 goto out;
1711 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
1712 if (err)
1713 goto out;
1714
1715 fdentry = ffhp->fh_dentry;
1716 fdir = fdentry->d_inode;
1717
1718 tdentry = tfhp->fh_dentry;
1719 tdir = tdentry->d_inode;
1720
1721 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1722 if (ffhp->fh_export != tfhp->fh_export)
1723 goto out;
1724
1725 err = nfserr_perm;
1726 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1727 goto out;
1728
1729
1730
1731 trap = lock_rename(tdentry, fdentry);
1732 ffhp->fh_locked = tfhp->fh_locked = 1;
1733 fill_pre_wcc(ffhp);
1734 fill_pre_wcc(tfhp);
1735
1736 odentry = lookup_one_len(fname, fdentry, flen);
1737 host_err = PTR_ERR(odentry);
1738 if (IS_ERR(odentry))
1739 goto out_nfserr;
1740
1741 host_err = -ENOENT;
1742 if (!odentry->d_inode)
1743 goto out_dput_old;
1744 host_err = -EINVAL;
1745 if (odentry == trap)
1746 goto out_dput_old;
1747
1748 ndentry = lookup_one_len(tname, tdentry, tlen);
1749 host_err = PTR_ERR(ndentry);
1750 if (IS_ERR(ndentry))
1751 goto out_dput_old;
1752 host_err = -ENOTEMPTY;
1753 if (ndentry == trap)
1754 goto out_dput_new;
1755
1756 if (svc_msnfs(ffhp) &&
1757 ((atomic_read(&odentry->d_count) > 1)
1758 || (atomic_read(&ndentry->d_count) > 1))) {
1759 host_err = -EPERM;
1760 goto out_dput_new;
1761 }
1762
1763 host_err = -EXDEV;
1764 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
1765 goto out_dput_new;
1766 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
1767 if (host_err)
1768 goto out_dput_new;
1769
1770 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1771 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1772 host_err = nfsd_sync_dir(tdentry);
1773 if (!host_err)
1774 host_err = nfsd_sync_dir(fdentry);
1775 }
1776
1777 mnt_drop_write(ffhp->fh_export->ex_path.mnt);
1778
1779 out_dput_new:
1780 dput(ndentry);
1781 out_dput_old:
1782 dput(odentry);
1783 out_nfserr:
1784 err = nfserrno(host_err);
1785
1786
1787
1788
1789
1790 fill_post_wcc(ffhp);
1791 fill_post_wcc(tfhp);
1792 unlock_rename(tdentry, fdentry);
1793 ffhp->fh_locked = tfhp->fh_locked = 0;
1794
1795out:
1796 return err;
1797}
1798
1799
1800
1801
1802
1803__be32
1804nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1805 char *fname, int flen)
1806{
1807 struct dentry *dentry, *rdentry;
1808 struct inode *dirp;
1809 __be32 err;
1810 int host_err;
1811
1812 err = nfserr_acces;
1813 if (!flen || isdotent(fname, flen))
1814 goto out;
1815 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE);
1816 if (err)
1817 goto out;
1818
1819 fh_lock_nested(fhp, I_MUTEX_PARENT);
1820 dentry = fhp->fh_dentry;
1821 dirp = dentry->d_inode;
1822
1823 rdentry = lookup_one_len(fname, dentry, flen);
1824 host_err = PTR_ERR(rdentry);
1825 if (IS_ERR(rdentry))
1826 goto out_nfserr;
1827
1828 if (!rdentry->d_inode) {
1829 dput(rdentry);
1830 err = nfserr_noent;
1831 goto out;
1832 }
1833
1834 if (!type)
1835 type = rdentry->d_inode->i_mode & S_IFMT;
1836
1837 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1838 if (host_err)
1839 goto out_nfserr;
1840
1841 if (type != S_IFDIR) {
1842#ifdef MSNFS
1843 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1844 (atomic_read(&rdentry->d_count) > 1)) {
1845 host_err = -EPERM;
1846 } else
1847#endif
1848 host_err = vfs_unlink(dirp, rdentry);
1849 } else {
1850 host_err = vfs_rmdir(dirp, rdentry);
1851 }
1852
1853 dput(rdentry);
1854
1855 if (host_err)
1856 goto out_drop;
1857 if (EX_ISSYNC(fhp->fh_export))
1858 host_err = nfsd_sync_dir(dentry);
1859
1860out_drop:
1861 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1862out_nfserr:
1863 err = nfserrno(host_err);
1864out:
1865 return err;
1866}
1867
1868
1869
1870
1871
1872
1873
1874
1875struct buffered_dirent {
1876 u64 ino;
1877 loff_t offset;
1878 int namlen;
1879 unsigned int d_type;
1880 char name[];
1881};
1882
1883struct readdir_data {
1884 char *dirent;
1885 size_t used;
1886 int full;
1887};
1888
1889static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
1890 loff_t offset, u64 ino, unsigned int d_type)
1891{
1892 struct readdir_data *buf = __buf;
1893 struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
1894 unsigned int reclen;
1895
1896 reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
1897 if (buf->used + reclen > PAGE_SIZE) {
1898 buf->full = 1;
1899 return -EINVAL;
1900 }
1901
1902 de->namlen = namlen;
1903 de->offset = offset;
1904 de->ino = ino;
1905 de->d_type = d_type;
1906 memcpy(de->name, name, namlen);
1907 buf->used += reclen;
1908
1909 return 0;
1910}
1911
1912static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
1913 struct readdir_cd *cdp, loff_t *offsetp)
1914{
1915 struct readdir_data buf;
1916 struct buffered_dirent *de;
1917 int host_err;
1918 int size;
1919 loff_t offset;
1920
1921 buf.dirent = (void *)__get_free_page(GFP_KERNEL);
1922 if (!buf.dirent)
1923 return nfserrno(-ENOMEM);
1924
1925 offset = *offsetp;
1926
1927 while (1) {
1928 struct inode *dir_inode = file->f_path.dentry->d_inode;
1929 unsigned int reclen;
1930
1931 cdp->err = nfserr_eof;
1932 buf.used = 0;
1933 buf.full = 0;
1934
1935 host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
1936 if (buf.full)
1937 host_err = 0;
1938
1939 if (host_err < 0)
1940 break;
1941
1942 size = buf.used;
1943
1944 if (!size)
1945 break;
1946
1947
1948
1949
1950
1951
1952 host_err = mutex_lock_killable(&dir_inode->i_mutex);
1953 if (host_err)
1954 break;
1955
1956 de = (struct buffered_dirent *)buf.dirent;
1957 while (size > 0) {
1958 offset = de->offset;
1959
1960 if (func(cdp, de->name, de->namlen, de->offset,
1961 de->ino, de->d_type))
1962 break;
1963
1964 if (cdp->err != nfs_ok)
1965 break;
1966
1967 reclen = ALIGN(sizeof(*de) + de->namlen,
1968 sizeof(u64));
1969 size -= reclen;
1970 de = (struct buffered_dirent *)((char *)de + reclen);
1971 }
1972 mutex_unlock(&dir_inode->i_mutex);
1973 if (size > 0)
1974 break;
1975
1976 offset = vfs_llseek(file, 0, SEEK_CUR);
1977 }
1978
1979 free_page((unsigned long)(buf.dirent));
1980
1981 if (host_err)
1982 return nfserrno(host_err);
1983
1984 *offsetp = offset;
1985 return cdp->err;
1986}
1987
1988
1989
1990
1991
1992__be32
1993nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1994 struct readdir_cd *cdp, filldir_t func)
1995{
1996 __be32 err;
1997 struct file *file;
1998 loff_t offset = *offsetp;
1999
2000 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
2001 if (err)
2002 goto out;
2003
2004 offset = vfs_llseek(file, offset, 0);
2005 if (offset < 0) {
2006 err = nfserrno((int)offset);
2007 goto out_close;
2008 }
2009
2010 err = nfsd_buffered_readdir(file, func, cdp, offsetp);
2011
2012 if (err == nfserr_eof || err == nfserr_toosmall)
2013 err = nfs_ok;
2014out_close:
2015 nfsd_close(file);
2016out:
2017 return err;
2018}
2019
2020
2021
2022
2023
2024__be32
2025nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
2026{
2027 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
2028 if (!err && vfs_statfs(fhp->fh_dentry,stat))
2029 err = nfserr_io;
2030 return err;
2031}
2032
2033static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
2034{
2035 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
2036}
2037
2038
2039
2040
2041__be32
2042nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
2043 struct dentry *dentry, int acc)
2044{
2045 struct inode *inode = dentry->d_inode;
2046 struct path path;
2047 int err;
2048
2049 if (acc == NFSD_MAY_NOP)
2050 return 0;
2051#if 0
2052 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2053 acc,
2054 (acc & NFSD_MAY_READ)? " read" : "",
2055 (acc & NFSD_MAY_WRITE)? " write" : "",
2056 (acc & NFSD_MAY_EXEC)? " exec" : "",
2057 (acc & NFSD_MAY_SATTR)? " sattr" : "",
2058 (acc & NFSD_MAY_TRUNC)? " trunc" : "",
2059 (acc & NFSD_MAY_LOCK)? " lock" : "",
2060 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
2061 inode->i_mode,
2062 IS_IMMUTABLE(inode)? " immut" : "",
2063 IS_APPEND(inode)? " append" : "",
2064 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
2065 dprintk(" owner %d/%d user %d/%d\n",
2066 inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
2067#endif
2068
2069
2070
2071
2072
2073 if (!(acc & NFSD_MAY_LOCAL_ACCESS))
2074 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
2075 if (exp_rdonly(rqstp, exp) ||
2076 __mnt_is_readonly(exp->ex_path.mnt))
2077 return nfserr_rofs;
2078 if ( IS_IMMUTABLE(inode))
2079 return nfserr_perm;
2080 }
2081 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
2082 return nfserr_perm;
2083
2084 if (acc & NFSD_MAY_LOCK) {
2085
2086
2087
2088
2089 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
2090 return 0;
2091 else
2092 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE;
2093 }
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108 if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
2109 inode->i_uid == current_fsuid())
2110 return 0;
2111
2112
2113 err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
2114
2115
2116 if (err == -EACCES && S_ISREG(inode->i_mode) &&
2117 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE))
2118 err = inode_permission(inode, MAY_EXEC);
2119 if (err)
2120 goto nfsd_out;
2121
2122
2123
2124
2125 path.mnt = exp->ex_path.mnt;
2126 path.dentry = dentry;
2127 err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
2128 IMA_COUNT_LEAVE);
2129nfsd_out:
2130 return err? nfserrno(err) : 0;
2131}
2132
2133void
2134nfsd_racache_shutdown(void)
2135{
2136 struct raparms *raparm, *last_raparm;
2137 unsigned int i;
2138
2139 dprintk("nfsd: freeing readahead buffers.\n");
2140
2141 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2142 raparm = raparm_hash[i].pb_head;
2143 while(raparm) {
2144 last_raparm = raparm;
2145 raparm = raparm->p_next;
2146 kfree(last_raparm);
2147 }
2148 raparm_hash[i].pb_head = NULL;
2149 }
2150}
2151
2152
2153
2154int
2155nfsd_racache_init(int cache_size)
2156{
2157 int i;
2158 int j = 0;
2159 int nperbucket;
2160 struct raparms **raparm = NULL;
2161
2162
2163 if (raparm_hash[0].pb_head)
2164 return 0;
2165 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
2166 if (nperbucket < 2)
2167 nperbucket = 2;
2168 cache_size = nperbucket * RAPARM_HASH_SIZE;
2169
2170 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
2171
2172 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2173 spin_lock_init(&raparm_hash[i].pb_lock);
2174
2175 raparm = &raparm_hash[i].pb_head;
2176 for (j = 0; j < nperbucket; j++) {
2177 *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
2178 if (!*raparm)
2179 goto out_nomem;
2180 raparm = &(*raparm)->p_next;
2181 }
2182 *raparm = NULL;
2183 }
2184
2185 nfsdstats.ra_size = cache_size;
2186 return 0;
2187
2188out_nomem:
2189 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2190 nfsd_racache_shutdown();
2191 return -ENOMEM;
2192}
2193
2194#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2195struct posix_acl *
2196nfsd_get_posix_acl(struct svc_fh *fhp, int type)
2197{
2198 struct inode *inode = fhp->fh_dentry->d_inode;
2199 char *name;
2200 void *value = NULL;
2201 ssize_t size;
2202 struct posix_acl *acl;
2203
2204 if (!IS_POSIXACL(inode))
2205 return ERR_PTR(-EOPNOTSUPP);
2206
2207 switch (type) {
2208 case ACL_TYPE_ACCESS:
2209 name = POSIX_ACL_XATTR_ACCESS;
2210 break;
2211 case ACL_TYPE_DEFAULT:
2212 name = POSIX_ACL_XATTR_DEFAULT;
2213 break;
2214 default:
2215 return ERR_PTR(-EOPNOTSUPP);
2216 }
2217
2218 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
2219 if (size < 0)
2220 return ERR_PTR(size);
2221
2222 acl = posix_acl_from_xattr(value, size);
2223 kfree(value);
2224 return acl;
2225}
2226
2227int
2228nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2229{
2230 struct inode *inode = fhp->fh_dentry->d_inode;
2231 char *name;
2232 void *value = NULL;
2233 size_t size;
2234 int error;
2235
2236 if (!IS_POSIXACL(inode) ||
2237 !inode->i_op->setxattr || !inode->i_op->removexattr)
2238 return -EOPNOTSUPP;
2239 switch(type) {
2240 case ACL_TYPE_ACCESS:
2241 name = POSIX_ACL_XATTR_ACCESS;
2242 break;
2243 case ACL_TYPE_DEFAULT:
2244 name = POSIX_ACL_XATTR_DEFAULT;
2245 break;
2246 default:
2247 return -EOPNOTSUPP;
2248 }
2249
2250 if (acl && acl->a_count) {
2251 size = posix_acl_xattr_size(acl->a_count);
2252 value = kmalloc(size, GFP_KERNEL);
2253 if (!value)
2254 return -ENOMEM;
2255 error = posix_acl_to_xattr(acl, value, size);
2256 if (error < 0)
2257 goto getout;
2258 size = error;
2259 } else
2260 size = 0;
2261
2262 error = mnt_want_write(fhp->fh_export->ex_path.mnt);
2263 if (error)
2264 goto getout;
2265 if (size)
2266 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2267 else {
2268 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2269 error = 0;
2270 else {
2271 error = vfs_removexattr(fhp->fh_dentry, name);
2272 if (error == -ENODATA)
2273 error = 0;
2274 }
2275 }
2276 mnt_drop_write(fhp->fh_export->ex_path.mnt);
2277
2278getout:
2279 kfree(value);
2280 return error;
2281}
2282#endif
2283