1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/fs.h>
21 #include <linux/namei.h>
22 #include <linux/ctype.h>
23 #include <linux/quotaops.h>
24 #include <linux/exportfs.h>
25 #include "jfs_incore.h"
26 #include "jfs_superblock.h"
27 #include "jfs_inode.h"
28 #include "jfs_dinode.h"
29 #include "jfs_dmap.h"
30 #include "jfs_unicode.h"
31 #include "jfs_metapage.h"
32 #include "jfs_xattr.h"
33 #include "jfs_acl.h"
34 #include "jfs_debug.h"
35
36 /*
37 * forward references
38 */
39 const struct dentry_operations jfs_ci_dentry_operations;
40
41 static s64 commitZeroLink(tid_t, struct inode *);
42
43 /*
44 * NAME: free_ea_wmap(inode)
45 *
46 * FUNCTION: free uncommitted extended attributes from working map
47 *
48 */
free_ea_wmap(struct inode * inode)49 static inline void free_ea_wmap(struct inode *inode)
50 {
51 dxd_t *ea = &JFS_IP(inode)->ea;
52
53 if (ea->flag & DXD_EXTENT) {
54 /* free EA pages from cache */
55 invalidate_dxd_metapages(inode, *ea);
56 dbFree(inode, addressDXD(ea), lengthDXD(ea));
57 }
58 ea->flag = 0;
59 }
60
61 /*
62 * NAME: jfs_create(dip, dentry, mode)
63 *
64 * FUNCTION: create a regular file in the parent directory <dip>
65 * with name = <from dentry> and mode = <mode>
66 *
67 * PARAMETER: dip - parent directory vnode
68 * dentry - dentry of new file
69 * mode - create mode (rwxrwxrwx).
70 * nd- nd struct
71 *
72 * RETURN: Errors from subroutines
73 *
74 */
jfs_create(struct inode * dip,struct dentry * dentry,umode_t mode,bool excl)75 static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
76 bool excl)
77 {
78 int rc = 0;
79 tid_t tid; /* transaction id */
80 struct inode *ip = NULL; /* child directory inode */
81 ino_t ino;
82 struct component_name dname; /* child directory name */
83 struct btstack btstack;
84 struct inode *iplist[2];
85 struct tblock *tblk;
86
87 jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
88
89 rc = dquot_initialize(dip);
90 if (rc)
91 goto out1;
92
93 /*
94 * search parent directory for entry/freespace
95 * (dtSearch() returns parent directory page pinned)
96 */
97 if ((rc = get_UCSname(&dname, dentry)))
98 goto out1;
99
100 /*
101 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
102 * block there while holding dtree page, so we allocate the inode &
103 * begin the transaction before we search the directory.
104 */
105 ip = ialloc(dip, mode);
106 if (IS_ERR(ip)) {
107 rc = PTR_ERR(ip);
108 goto out2;
109 }
110
111 tid = txBegin(dip->i_sb, 0);
112
113 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
114 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
115
116 rc = jfs_init_acl(tid, ip, dip);
117 if (rc)
118 goto out3;
119
120 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
121 if (rc) {
122 txAbort(tid, 0);
123 goto out3;
124 }
125
126 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
127 jfs_err("jfs_create: dtSearch returned %d", rc);
128 txAbort(tid, 0);
129 goto out3;
130 }
131
132 tblk = tid_to_tblock(tid);
133 tblk->xflag |= COMMIT_CREATE;
134 tblk->ino = ip->i_ino;
135 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
136
137 iplist[0] = dip;
138 iplist[1] = ip;
139
140 /*
141 * initialize the child XAD tree root in-line in inode
142 */
143 xtInitRoot(tid, ip);
144
145 /*
146 * create entry in parent directory for child directory
147 * (dtInsert() releases parent directory page)
148 */
149 ino = ip->i_ino;
150 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
151 if (rc == -EIO) {
152 jfs_err("jfs_create: dtInsert returned -EIO");
153 txAbort(tid, 1); /* Marks Filesystem dirty */
154 } else
155 txAbort(tid, 0); /* Filesystem full */
156 goto out3;
157 }
158
159 ip->i_op = &jfs_file_inode_operations;
160 ip->i_fop = &jfs_file_operations;
161 ip->i_mapping->a_ops = &jfs_aops;
162
163 mark_inode_dirty(ip);
164
165 dip->i_ctime = dip->i_mtime = current_time(dip);
166
167 mark_inode_dirty(dip);
168
169 rc = txCommit(tid, 2, &iplist[0], 0);
170
171 out3:
172 txEnd(tid);
173 mutex_unlock(&JFS_IP(ip)->commit_mutex);
174 mutex_unlock(&JFS_IP(dip)->commit_mutex);
175 if (rc) {
176 free_ea_wmap(ip);
177 clear_nlink(ip);
178 discard_new_inode(ip);
179 } else {
180 d_instantiate_new(dentry, ip);
181 }
182
183 out2:
184 free_UCSname(&dname);
185
186 out1:
187
188 jfs_info("jfs_create: rc:%d", rc);
189 return rc;
190 }
191
192
193 /*
194 * NAME: jfs_mkdir(dip, dentry, mode)
195 *
196 * FUNCTION: create a child directory in the parent directory <dip>
197 * with name = <from dentry> and mode = <mode>
198 *
199 * PARAMETER: dip - parent directory vnode
200 * dentry - dentry of child directory
201 * mode - create mode (rwxrwxrwx).
202 *
203 * RETURN: Errors from subroutines
204 *
205 * note:
206 * EACCESS: user needs search+write permission on the parent directory
207 */
jfs_mkdir(struct inode * dip,struct dentry * dentry,umode_t mode)208 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
209 {
210 int rc = 0;
211 tid_t tid; /* transaction id */
212 struct inode *ip = NULL; /* child directory inode */
213 ino_t ino;
214 struct component_name dname; /* child directory name */
215 struct btstack btstack;
216 struct inode *iplist[2];
217 struct tblock *tblk;
218
219 jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
220
221 rc = dquot_initialize(dip);
222 if (rc)
223 goto out1;
224
225 /*
226 * search parent directory for entry/freespace
227 * (dtSearch() returns parent directory page pinned)
228 */
229 if ((rc = get_UCSname(&dname, dentry)))
230 goto out1;
231
232 /*
233 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
234 * block there while holding dtree page, so we allocate the inode &
235 * begin the transaction before we search the directory.
236 */
237 ip = ialloc(dip, S_IFDIR | mode);
238 if (IS_ERR(ip)) {
239 rc = PTR_ERR(ip);
240 goto out2;
241 }
242
243 tid = txBegin(dip->i_sb, 0);
244
245 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
246 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
247
248 rc = jfs_init_acl(tid, ip, dip);
249 if (rc)
250 goto out3;
251
252 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
253 if (rc) {
254 txAbort(tid, 0);
255 goto out3;
256 }
257
258 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
259 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
260 txAbort(tid, 0);
261 goto out3;
262 }
263
264 tblk = tid_to_tblock(tid);
265 tblk->xflag |= COMMIT_CREATE;
266 tblk->ino = ip->i_ino;
267 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
268
269 iplist[0] = dip;
270 iplist[1] = ip;
271
272 /*
273 * initialize the child directory in-line in inode
274 */
275 dtInitRoot(tid, ip, dip->i_ino);
276
277 /*
278 * create entry in parent directory for child directory
279 * (dtInsert() releases parent directory page)
280 */
281 ino = ip->i_ino;
282 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
283 if (rc == -EIO) {
284 jfs_err("jfs_mkdir: dtInsert returned -EIO");
285 txAbort(tid, 1); /* Marks Filesystem dirty */
286 } else
287 txAbort(tid, 0); /* Filesystem full */
288 goto out3;
289 }
290
291 set_nlink(ip, 2); /* for '.' */
292 ip->i_op = &jfs_dir_inode_operations;
293 ip->i_fop = &jfs_dir_operations;
294
295 mark_inode_dirty(ip);
296
297 /* update parent directory inode */
298 inc_nlink(dip); /* for '..' from child directory */
299 dip->i_ctime = dip->i_mtime = current_time(dip);
300 mark_inode_dirty(dip);
301
302 rc = txCommit(tid, 2, &iplist[0], 0);
303
304 out3:
305 txEnd(tid);
306 mutex_unlock(&JFS_IP(ip)->commit_mutex);
307 mutex_unlock(&JFS_IP(dip)->commit_mutex);
308 if (rc) {
309 free_ea_wmap(ip);
310 clear_nlink(ip);
311 discard_new_inode(ip);
312 } else {
313 d_instantiate_new(dentry, ip);
314 }
315
316 out2:
317 free_UCSname(&dname);
318
319
320 out1:
321
322 jfs_info("jfs_mkdir: rc:%d", rc);
323 return rc;
324 }
325
326 /*
327 * NAME: jfs_rmdir(dip, dentry)
328 *
329 * FUNCTION: remove a link to child directory
330 *
331 * PARAMETER: dip - parent inode
332 * dentry - child directory dentry
333 *
334 * RETURN: -EINVAL - if name is . or ..
335 * -EINVAL - if . or .. exist but are invalid.
336 * errors from subroutines
337 *
338 * note:
339 * if other threads have the directory open when the last link
340 * is removed, the "." and ".." entries, if present, are removed before
341 * rmdir() returns and no new entries may be created in the directory,
342 * but the directory is not removed until the last reference to
343 * the directory is released (cf.unlink() of regular file).
344 */
jfs_rmdir(struct inode * dip,struct dentry * dentry)345 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
346 {
347 int rc;
348 tid_t tid; /* transaction id */
349 struct inode *ip = d_inode(dentry);
350 ino_t ino;
351 struct component_name dname;
352 struct inode *iplist[2];
353 struct tblock *tblk;
354
355 jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
356
357 /* Init inode for quota operations. */
358 rc = dquot_initialize(dip);
359 if (rc)
360 goto out;
361 rc = dquot_initialize(ip);
362 if (rc)
363 goto out;
364
365 /* directory must be empty to be removed */
366 if (!dtEmpty(ip)) {
367 rc = -ENOTEMPTY;
368 goto out;
369 }
370
371 if ((rc = get_UCSname(&dname, dentry))) {
372 goto out;
373 }
374
375 tid = txBegin(dip->i_sb, 0);
376
377 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
378 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
379
380 iplist[0] = dip;
381 iplist[1] = ip;
382
383 tblk = tid_to_tblock(tid);
384 tblk->xflag |= COMMIT_DELETE;
385 tblk->u.ip = ip;
386
387 /*
388 * delete the entry of target directory from parent directory
389 */
390 ino = ip->i_ino;
391 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
392 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
393 if (rc == -EIO)
394 txAbort(tid, 1);
395 txEnd(tid);
396 mutex_unlock(&JFS_IP(ip)->commit_mutex);
397 mutex_unlock(&JFS_IP(dip)->commit_mutex);
398
399 goto out2;
400 }
401
402 /* update parent directory's link count corresponding
403 * to ".." entry of the target directory deleted
404 */
405 dip->i_ctime = dip->i_mtime = current_time(dip);
406 inode_dec_link_count(dip);
407
408 /*
409 * OS/2 could have created EA and/or ACL
410 */
411 /* free EA from both persistent and working map */
412 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
413 /* free EA pages */
414 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
415 }
416 JFS_IP(ip)->ea.flag = 0;
417
418 /* free ACL from both persistent and working map */
419 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
420 /* free ACL pages */
421 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
422 }
423 JFS_IP(ip)->acl.flag = 0;
424
425 /* mark the target directory as deleted */
426 clear_nlink(ip);
427 mark_inode_dirty(ip);
428
429 rc = txCommit(tid, 2, &iplist[0], 0);
430
431 txEnd(tid);
432
433 mutex_unlock(&JFS_IP(ip)->commit_mutex);
434 mutex_unlock(&JFS_IP(dip)->commit_mutex);
435
436 /*
437 * Truncating the directory index table is not guaranteed. It
438 * may need to be done iteratively
439 */
440 if (test_cflag(COMMIT_Stale, dip)) {
441 if (dip->i_size > 1)
442 jfs_truncate_nolock(dip, 0);
443
444 clear_cflag(COMMIT_Stale, dip);
445 }
446
447 out2:
448 free_UCSname(&dname);
449
450 out:
451 jfs_info("jfs_rmdir: rc:%d", rc);
452 return rc;
453 }
454
455 /*
456 * NAME: jfs_unlink(dip, dentry)
457 *
458 * FUNCTION: remove a link to object <vp> named by <name>
459 * from parent directory <dvp>
460 *
461 * PARAMETER: dip - inode of parent directory
462 * dentry - dentry of object to be removed
463 *
464 * RETURN: errors from subroutines
465 *
466 * note:
467 * temporary file: if one or more processes have the file open
468 * when the last link is removed, the link will be removed before
469 * unlink() returns, but the removal of the file contents will be
470 * postponed until all references to the files are closed.
471 *
472 * JFS does NOT support unlink() on directories.
473 *
474 */
jfs_unlink(struct inode * dip,struct dentry * dentry)475 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
476 {
477 int rc;
478 tid_t tid; /* transaction id */
479 struct inode *ip = d_inode(dentry);
480 ino_t ino;
481 struct component_name dname; /* object name */
482 struct inode *iplist[2];
483 struct tblock *tblk;
484 s64 new_size = 0;
485 int commit_flag;
486
487 jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
488
489 /* Init inode for quota operations. */
490 rc = dquot_initialize(dip);
491 if (rc)
492 goto out;
493 rc = dquot_initialize(ip);
494 if (rc)
495 goto out;
496
497 if ((rc = get_UCSname(&dname, dentry)))
498 goto out;
499
500 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
501
502 tid = txBegin(dip->i_sb, 0);
503
504 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
505 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
506
507 iplist[0] = dip;
508 iplist[1] = ip;
509
510 /*
511 * delete the entry of target file from parent directory
512 */
513 ino = ip->i_ino;
514 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
515 jfs_err("jfs_unlink: dtDelete returned %d", rc);
516 if (rc == -EIO)
517 txAbort(tid, 1); /* Marks FS Dirty */
518 txEnd(tid);
519 mutex_unlock(&JFS_IP(ip)->commit_mutex);
520 mutex_unlock(&JFS_IP(dip)->commit_mutex);
521 IWRITE_UNLOCK(ip);
522 goto out1;
523 }
524
525 ASSERT(ip->i_nlink);
526
527 ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip);
528 mark_inode_dirty(dip);
529
530 /* update target's inode */
531 inode_dec_link_count(ip);
532
533 /*
534 * commit zero link count object
535 */
536 if (ip->i_nlink == 0) {
537 assert(!test_cflag(COMMIT_Nolink, ip));
538 /* free block resources */
539 if ((new_size = commitZeroLink(tid, ip)) < 0) {
540 txAbort(tid, 1); /* Marks FS Dirty */
541 txEnd(tid);
542 mutex_unlock(&JFS_IP(ip)->commit_mutex);
543 mutex_unlock(&JFS_IP(dip)->commit_mutex);
544 IWRITE_UNLOCK(ip);
545 rc = new_size;
546 goto out1;
547 }
548 tblk = tid_to_tblock(tid);
549 tblk->xflag |= COMMIT_DELETE;
550 tblk->u.ip = ip;
551 }
552
553 /*
554 * Incomplete truncate of file data can
555 * result in timing problems unless we synchronously commit the
556 * transaction.
557 */
558 if (new_size)
559 commit_flag = COMMIT_SYNC;
560 else
561 commit_flag = 0;
562
563 /*
564 * If xtTruncate was incomplete, commit synchronously to avoid
565 * timing complications
566 */
567 rc = txCommit(tid, 2, &iplist[0], commit_flag);
568
569 txEnd(tid);
570
571 mutex_unlock(&JFS_IP(ip)->commit_mutex);
572 mutex_unlock(&JFS_IP(dip)->commit_mutex);
573
574 while (new_size && (rc == 0)) {
575 tid = txBegin(dip->i_sb, 0);
576 mutex_lock(&JFS_IP(ip)->commit_mutex);
577 new_size = xtTruncate_pmap(tid, ip, new_size);
578 if (new_size < 0) {
579 txAbort(tid, 1); /* Marks FS Dirty */
580 rc = new_size;
581 } else
582 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
583 txEnd(tid);
584 mutex_unlock(&JFS_IP(ip)->commit_mutex);
585 }
586
587 if (ip->i_nlink == 0)
588 set_cflag(COMMIT_Nolink, ip);
589
590 IWRITE_UNLOCK(ip);
591
592 /*
593 * Truncating the directory index table is not guaranteed. It
594 * may need to be done iteratively
595 */
596 if (test_cflag(COMMIT_Stale, dip)) {
597 if (dip->i_size > 1)
598 jfs_truncate_nolock(dip, 0);
599
600 clear_cflag(COMMIT_Stale, dip);
601 }
602
603 out1:
604 free_UCSname(&dname);
605 out:
606 jfs_info("jfs_unlink: rc:%d", rc);
607 return rc;
608 }
609
610 /*
611 * NAME: commitZeroLink()
612 *
613 * FUNCTION: for non-directory, called by jfs_remove(),
614 * truncate a regular file, directory or symbolic
615 * link to zero length. return 0 if type is not
616 * one of these.
617 *
618 * if the file is currently associated with a VM segment
619 * only permanent disk and inode map resources are freed,
620 * and neither the inode nor indirect blocks are modified
621 * so that the resources can be later freed in the work
622 * map by ctrunc1.
623 * if there is no VM segment on entry, the resources are
624 * freed in both work and permanent map.
625 * (? for temporary file - memory object is cached even
626 * after no reference:
627 * reference count > 0 - )
628 *
629 * PARAMETERS: cd - pointer to commit data structure.
630 * current inode is the one to truncate.
631 *
632 * RETURN: Errors from subroutines
633 */
commitZeroLink(tid_t tid,struct inode * ip)634 static s64 commitZeroLink(tid_t tid, struct inode *ip)
635 {
636 int filetype;
637 struct tblock *tblk;
638
639 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
640
641 filetype = ip->i_mode & S_IFMT;
642 switch (filetype) {
643 case S_IFREG:
644 break;
645 case S_IFLNK:
646 /* fast symbolic link */
647 if (ip->i_size < IDATASIZE) {
648 ip->i_size = 0;
649 return 0;
650 }
651 break;
652 default:
653 assert(filetype != S_IFDIR);
654 return 0;
655 }
656
657 set_cflag(COMMIT_Freewmap, ip);
658
659 /* mark transaction of block map update type */
660 tblk = tid_to_tblock(tid);
661 tblk->xflag |= COMMIT_PMAP;
662
663 /*
664 * free EA
665 */
666 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
667 /* acquire maplock on EA to be freed from block map */
668 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
669
670 /*
671 * free ACL
672 */
673 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
674 /* acquire maplock on EA to be freed from block map */
675 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
676
677 /*
678 * free xtree/data (truncate to zero length):
679 * free xtree/data pages from cache if COMMIT_PWMAP,
680 * free xtree/data blocks from persistent block map, and
681 * free xtree/data blocks from working block map if COMMIT_PWMAP;
682 */
683 if (ip->i_size)
684 return xtTruncate_pmap(tid, ip, 0);
685
686 return 0;
687 }
688
689
690 /*
691 * NAME: jfs_free_zero_link()
692 *
693 * FUNCTION: for non-directory, called by iClose(),
694 * free resources of a file from cache and WORKING map
695 * for a file previously committed with zero link count
696 * while associated with a pager object,
697 *
698 * PARAMETER: ip - pointer to inode of file.
699 */
jfs_free_zero_link(struct inode * ip)700 void jfs_free_zero_link(struct inode *ip)
701 {
702 int type;
703
704 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
705
706 /* return if not reg or symbolic link or if size is
707 * already ok.
708 */
709 type = ip->i_mode & S_IFMT;
710
711 switch (type) {
712 case S_IFREG:
713 break;
714 case S_IFLNK:
715 /* if its contained in inode nothing to do */
716 if (ip->i_size < IDATASIZE)
717 return;
718 break;
719 default:
720 return;
721 }
722
723 /*
724 * free EA
725 */
726 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
727 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
728 int xlen = lengthDXD(&JFS_IP(ip)->ea);
729 struct maplock maplock; /* maplock for COMMIT_WMAP */
730 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
731
732 /* free EA pages from cache */
733 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
734
735 /* free EA extent from working block map */
736 maplock.index = 1;
737 pxdlock = (struct pxd_lock *) & maplock;
738 pxdlock->flag = mlckFREEPXD;
739 PXDaddress(&pxdlock->pxd, xaddr);
740 PXDlength(&pxdlock->pxd, xlen);
741 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
742 }
743
744 /*
745 * free ACL
746 */
747 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
748 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
749 int xlen = lengthDXD(&JFS_IP(ip)->acl);
750 struct maplock maplock; /* maplock for COMMIT_WMAP */
751 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
752
753 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
754
755 /* free ACL extent from working block map */
756 maplock.index = 1;
757 pxdlock = (struct pxd_lock *) & maplock;
758 pxdlock->flag = mlckFREEPXD;
759 PXDaddress(&pxdlock->pxd, xaddr);
760 PXDlength(&pxdlock->pxd, xlen);
761 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
762 }
763
764 /*
765 * free xtree/data (truncate to zero length):
766 * free xtree/data pages from cache, and
767 * free xtree/data blocks from working block map;
768 */
769 if (ip->i_size)
770 xtTruncate(0, ip, 0, COMMIT_WMAP);
771 }
772
773 /*
774 * NAME: jfs_link(vp, dvp, name, crp)
775 *
776 * FUNCTION: create a link to <vp> by the name = <name>
777 * in the parent directory <dvp>
778 *
779 * PARAMETER: vp - target object
780 * dvp - parent directory of new link
781 * name - name of new link to target object
782 * crp - credential
783 *
784 * RETURN: Errors from subroutines
785 *
786 * note:
787 * JFS does NOT support link() on directories (to prevent circular
788 * path in the directory hierarchy);
789 * EPERM: the target object is a directory, and either the caller
790 * does not have appropriate privileges or the implementation prohibits
791 * using link() on directories [XPG4.2].
792 *
793 * JFS does NOT support links between file systems:
794 * EXDEV: target object and new link are on different file systems and
795 * implementation does not support links between file systems [XPG4.2].
796 */
jfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)797 static int jfs_link(struct dentry *old_dentry,
798 struct inode *dir, struct dentry *dentry)
799 {
800 int rc;
801 tid_t tid;
802 struct inode *ip = d_inode(old_dentry);
803 ino_t ino;
804 struct component_name dname;
805 struct btstack btstack;
806 struct inode *iplist[2];
807
808 jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
809
810 rc = dquot_initialize(dir);
811 if (rc)
812 goto out;
813
814 if (isReadOnly(ip)) {
815 jfs_error(ip->i_sb, "read-only filesystem\n");
816 return -EROFS;
817 }
818
819 tid = txBegin(ip->i_sb, 0);
820
821 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
822 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
823
824 /*
825 * scan parent directory for entry/freespace
826 */
827 if ((rc = get_UCSname(&dname, dentry)))
828 goto out_tx;
829
830 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
831 goto free_dname;
832
833 /*
834 * create entry for new link in parent directory
835 */
836 ino = ip->i_ino;
837 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
838 goto free_dname;
839
840 /* update object inode */
841 inc_nlink(ip); /* for new link */
842 ip->i_ctime = current_time(ip);
843 dir->i_ctime = dir->i_mtime = current_time(dir);
844 mark_inode_dirty(dir);
845 ihold(ip);
846
847 iplist[0] = ip;
848 iplist[1] = dir;
849 rc = txCommit(tid, 2, &iplist[0], 0);
850
851 if (rc) {
852 drop_nlink(ip); /* never instantiated */
853 iput(ip);
854 } else
855 d_instantiate(dentry, ip);
856
857 free_dname:
858 free_UCSname(&dname);
859
860 out_tx:
861 txEnd(tid);
862
863 mutex_unlock(&JFS_IP(ip)->commit_mutex);
864 mutex_unlock(&JFS_IP(dir)->commit_mutex);
865
866 out:
867 jfs_info("jfs_link: rc:%d", rc);
868 return rc;
869 }
870
871 /*
872 * NAME: jfs_symlink(dip, dentry, name)
873 *
874 * FUNCTION: creates a symbolic link to <symlink> by name <name>
875 * in directory <dip>
876 *
877 * PARAMETER: dip - parent directory vnode
878 * dentry - dentry of symbolic link
879 * name - the path name of the existing object
880 * that will be the source of the link
881 *
882 * RETURN: errors from subroutines
883 *
884 * note:
885 * ENAMETOOLONG: pathname resolution of a symbolic link produced
886 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
887 */
888
jfs_symlink(struct inode * dip,struct dentry * dentry,const char * name)889 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
890 const char *name)
891 {
892 int rc;
893 tid_t tid;
894 ino_t ino = 0;
895 struct component_name dname;
896 int ssize; /* source pathname size */
897 struct btstack btstack;
898 struct inode *ip = d_inode(dentry);
899 s64 xlen = 0;
900 int bmask = 0, xsize;
901 s64 xaddr;
902 struct metapage *mp;
903 struct super_block *sb;
904 struct tblock *tblk;
905
906 struct inode *iplist[2];
907
908 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
909
910 rc = dquot_initialize(dip);
911 if (rc)
912 goto out1;
913
914 ssize = strlen(name) + 1;
915
916 /*
917 * search parent directory for entry/freespace
918 * (dtSearch() returns parent directory page pinned)
919 */
920
921 if ((rc = get_UCSname(&dname, dentry)))
922 goto out1;
923
924 /*
925 * allocate on-disk/in-memory inode for symbolic link:
926 * (iAlloc() returns new, locked inode)
927 */
928 ip = ialloc(dip, S_IFLNK | 0777);
929 if (IS_ERR(ip)) {
930 rc = PTR_ERR(ip);
931 goto out2;
932 }
933
934 tid = txBegin(dip->i_sb, 0);
935
936 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
937 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
938
939 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
940 if (rc)
941 goto out3;
942
943 tblk = tid_to_tblock(tid);
944 tblk->xflag |= COMMIT_CREATE;
945 tblk->ino = ip->i_ino;
946 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
947
948 /* fix symlink access permission
949 * (dir_create() ANDs in the u.u_cmask,
950 * but symlinks really need to be 777 access)
951 */
952 ip->i_mode |= 0777;
953
954 /*
955 * write symbolic link target path name
956 */
957 xtInitRoot(tid, ip);
958
959 /*
960 * write source path name inline in on-disk inode (fast symbolic link)
961 */
962
963 if (ssize <= IDATASIZE) {
964 ip->i_op = &jfs_fast_symlink_inode_operations;
965
966 ip->i_link = JFS_IP(ip)->i_inline;
967 memcpy(ip->i_link, name, ssize);
968 ip->i_size = ssize - 1;
969
970 /*
971 * if symlink is > 128 bytes, we don't have the space to
972 * store inline extended attributes
973 */
974 if (ssize > sizeof (JFS_IP(ip)->i_inline))
975 JFS_IP(ip)->mode2 &= ~INLINEEA;
976
977 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
978 ssize, name);
979 }
980 /*
981 * write source path name in a single extent
982 */
983 else {
984 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
985
986 ip->i_op = &jfs_symlink_inode_operations;
987 inode_nohighmem(ip);
988 ip->i_mapping->a_ops = &jfs_aops;
989
990 /*
991 * even though the data of symlink object (source
992 * path name) is treated as non-journaled user data,
993 * it is read/written thru buffer cache for performance.
994 */
995 sb = ip->i_sb;
996 bmask = JFS_SBI(sb)->bsize - 1;
997 xsize = (ssize + bmask) & ~bmask;
998 xaddr = 0;
999 xlen = xsize >> JFS_SBI(sb)->l2bsize;
1000 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
1001 txAbort(tid, 0);
1002 goto out3;
1003 }
1004 ip->i_size = ssize - 1;
1005 while (ssize) {
1006 /* This is kind of silly since PATH_MAX == 4K */
1007 int copy_size = min(ssize, PSIZE);
1008
1009 mp = get_metapage(ip, xaddr, PSIZE, 1);
1010
1011 if (mp == NULL) {
1012 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1013 rc = -EIO;
1014 txAbort(tid, 0);
1015 goto out3;
1016 }
1017 memcpy(mp->data, name, copy_size);
1018 flush_metapage(mp);
1019 ssize -= copy_size;
1020 name += copy_size;
1021 xaddr += JFS_SBI(sb)->nbperpage;
1022 }
1023 }
1024
1025 /*
1026 * create entry for symbolic link in parent directory
1027 */
1028 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1029 if (rc == 0) {
1030 ino = ip->i_ino;
1031 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1032 }
1033 if (rc) {
1034 if (xlen)
1035 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1036 txAbort(tid, 0);
1037 /* discard new inode */
1038 goto out3;
1039 }
1040
1041 mark_inode_dirty(ip);
1042
1043 dip->i_ctime = dip->i_mtime = current_time(dip);
1044 mark_inode_dirty(dip);
1045 /*
1046 * commit update of parent directory and link object
1047 */
1048
1049 iplist[0] = dip;
1050 iplist[1] = ip;
1051 rc = txCommit(tid, 2, &iplist[0], 0);
1052
1053 out3:
1054 txEnd(tid);
1055 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1056 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1057 if (rc) {
1058 free_ea_wmap(ip);
1059 clear_nlink(ip);
1060 discard_new_inode(ip);
1061 } else {
1062 d_instantiate_new(dentry, ip);
1063 }
1064
1065 out2:
1066 free_UCSname(&dname);
1067
1068 out1:
1069 jfs_info("jfs_symlink: rc:%d", rc);
1070 return rc;
1071 }
1072
1073
1074 /*
1075 * NAME: jfs_rename
1076 *
1077 * FUNCTION: rename a file or directory
1078 */
jfs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1079 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1080 struct inode *new_dir, struct dentry *new_dentry,
1081 unsigned int flags)
1082 {
1083 struct btstack btstack;
1084 ino_t ino;
1085 struct component_name new_dname;
1086 struct inode *new_ip;
1087 struct component_name old_dname;
1088 struct inode *old_ip;
1089 int rc;
1090 tid_t tid;
1091 struct tlock *tlck;
1092 struct dt_lock *dtlck;
1093 struct lv *lv;
1094 int ipcount;
1095 struct inode *iplist[4];
1096 struct tblock *tblk;
1097 s64 new_size = 0;
1098 int commit_flag;
1099
1100 if (flags & ~RENAME_NOREPLACE)
1101 return -EINVAL;
1102
1103 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1104
1105 rc = dquot_initialize(old_dir);
1106 if (rc)
1107 goto out1;
1108 rc = dquot_initialize(new_dir);
1109 if (rc)
1110 goto out1;
1111
1112 old_ip = d_inode(old_dentry);
1113 new_ip = d_inode(new_dentry);
1114
1115 if ((rc = get_UCSname(&old_dname, old_dentry)))
1116 goto out1;
1117
1118 if ((rc = get_UCSname(&new_dname, new_dentry)))
1119 goto out2;
1120
1121 /*
1122 * Make sure source inode number is what we think it is
1123 */
1124 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1125 if (rc || (ino != old_ip->i_ino)) {
1126 rc = -ENOENT;
1127 goto out3;
1128 }
1129
1130 /*
1131 * Make sure dest inode number (if any) is what we think it is
1132 */
1133 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1134 if (!rc) {
1135 if ((!new_ip) || (ino != new_ip->i_ino)) {
1136 rc = -ESTALE;
1137 goto out3;
1138 }
1139 } else if (rc != -ENOENT)
1140 goto out3;
1141 else if (new_ip) {
1142 /* no entry exists, but one was expected */
1143 rc = -ESTALE;
1144 goto out3;
1145 }
1146
1147 if (S_ISDIR(old_ip->i_mode)) {
1148 if (new_ip) {
1149 if (!dtEmpty(new_ip)) {
1150 rc = -ENOTEMPTY;
1151 goto out3;
1152 }
1153 }
1154 } else if (new_ip) {
1155 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1156 /* Init inode for quota operations. */
1157 rc = dquot_initialize(new_ip);
1158 if (rc)
1159 goto out_unlock;
1160 }
1161
1162 /*
1163 * The real work starts here
1164 */
1165 tid = txBegin(new_dir->i_sb, 0);
1166
1167 /*
1168 * How do we know the locking is safe from deadlocks?
1169 * The vfs does the hard part for us. Any time we are taking nested
1170 * commit_mutexes, the vfs already has i_mutex held on the parent.
1171 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1172 */
1173 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1174 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1175 if (old_dir != new_dir)
1176 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1177 COMMIT_MUTEX_SECOND_PARENT);
1178
1179 if (new_ip) {
1180 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1181 COMMIT_MUTEX_VICTIM);
1182 /*
1183 * Change existing directory entry to new inode number
1184 */
1185 ino = new_ip->i_ino;
1186 rc = dtModify(tid, new_dir, &new_dname, &ino,
1187 old_ip->i_ino, JFS_RENAME);
1188 if (rc)
1189 goto out_tx;
1190 drop_nlink(new_ip);
1191 if (S_ISDIR(new_ip->i_mode)) {
1192 drop_nlink(new_ip);
1193 if (new_ip->i_nlink) {
1194 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1195 if (old_dir != new_dir)
1196 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1197 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1198 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1199 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1200 IWRITE_UNLOCK(new_ip);
1201 jfs_error(new_ip->i_sb,
1202 "new_ip->i_nlink != 0\n");
1203 return -EIO;
1204 }
1205 tblk = tid_to_tblock(tid);
1206 tblk->xflag |= COMMIT_DELETE;
1207 tblk->u.ip = new_ip;
1208 } else if (new_ip->i_nlink == 0) {
1209 assert(!test_cflag(COMMIT_Nolink, new_ip));
1210 /* free block resources */
1211 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1212 txAbort(tid, 1); /* Marks FS Dirty */
1213 rc = new_size;
1214 goto out_tx;
1215 }
1216 tblk = tid_to_tblock(tid);
1217 tblk->xflag |= COMMIT_DELETE;
1218 tblk->u.ip = new_ip;
1219 } else {
1220 new_ip->i_ctime = current_time(new_ip);
1221 mark_inode_dirty(new_ip);
1222 }
1223 } else {
1224 /*
1225 * Add new directory entry
1226 */
1227 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1228 JFS_CREATE);
1229 if (rc) {
1230 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1231 rc);
1232 goto out_tx;
1233 }
1234
1235 ino = old_ip->i_ino;
1236 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1237 if (rc) {
1238 if (rc == -EIO)
1239 jfs_err("jfs_rename: dtInsert returned -EIO");
1240 goto out_tx;
1241 }
1242 if (S_ISDIR(old_ip->i_mode))
1243 inc_nlink(new_dir);
1244 }
1245 /*
1246 * Remove old directory entry
1247 */
1248
1249 ino = old_ip->i_ino;
1250 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1251 if (rc) {
1252 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1253 rc);
1254 txAbort(tid, 1); /* Marks Filesystem dirty */
1255 goto out_tx;
1256 }
1257 if (S_ISDIR(old_ip->i_mode)) {
1258 drop_nlink(old_dir);
1259 if (old_dir != new_dir) {
1260 /*
1261 * Change inode number of parent for moved directory
1262 */
1263
1264 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1265 cpu_to_le32(new_dir->i_ino);
1266
1267 /* Linelock header of dtree */
1268 tlck = txLock(tid, old_ip,
1269 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1270 tlckDTREE | tlckBTROOT | tlckRELINK);
1271 dtlck = (struct dt_lock *) & tlck->lock;
1272 ASSERT(dtlck->index == 0);
1273 lv = & dtlck->lv[0];
1274 lv->offset = 0;
1275 lv->length = 1;
1276 dtlck->index++;
1277 }
1278 }
1279
1280 /*
1281 * Update ctime on changed/moved inodes & mark dirty
1282 */
1283 old_ip->i_ctime = current_time(old_ip);
1284 mark_inode_dirty(old_ip);
1285
1286 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1287 mark_inode_dirty(new_dir);
1288
1289 /* Build list of inodes modified by this transaction */
1290 ipcount = 0;
1291 iplist[ipcount++] = old_ip;
1292 if (new_ip)
1293 iplist[ipcount++] = new_ip;
1294 iplist[ipcount++] = old_dir;
1295
1296 if (old_dir != new_dir) {
1297 iplist[ipcount++] = new_dir;
1298 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1299 mark_inode_dirty(old_dir);
1300 }
1301
1302 /*
1303 * Incomplete truncate of file data can
1304 * result in timing problems unless we synchronously commit the
1305 * transaction.
1306 */
1307 if (new_size)
1308 commit_flag = COMMIT_SYNC;
1309 else
1310 commit_flag = 0;
1311
1312 rc = txCommit(tid, ipcount, iplist, commit_flag);
1313
1314 out_tx:
1315 txEnd(tid);
1316 if (new_ip)
1317 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1318 if (old_dir != new_dir)
1319 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1320 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1321 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1322
1323 while (new_size && (rc == 0)) {
1324 tid = txBegin(new_ip->i_sb, 0);
1325 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1326 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1327 if (new_size < 0) {
1328 txAbort(tid, 1);
1329 rc = new_size;
1330 } else
1331 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1332 txEnd(tid);
1333 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1334 }
1335 if (new_ip && (new_ip->i_nlink == 0))
1336 set_cflag(COMMIT_Nolink, new_ip);
1337 /*
1338 * Truncating the directory index table is not guaranteed. It
1339 * may need to be done iteratively
1340 */
1341 if (test_cflag(COMMIT_Stale, old_dir)) {
1342 if (old_dir->i_size > 1)
1343 jfs_truncate_nolock(old_dir, 0);
1344
1345 clear_cflag(COMMIT_Stale, old_dir);
1346 }
1347 out_unlock:
1348 if (new_ip && !S_ISDIR(new_ip->i_mode))
1349 IWRITE_UNLOCK(new_ip);
1350 out3:
1351 free_UCSname(&new_dname);
1352 out2:
1353 free_UCSname(&old_dname);
1354 out1:
1355 jfs_info("jfs_rename: returning %d", rc);
1356 return rc;
1357 }
1358
1359
1360 /*
1361 * NAME: jfs_mknod
1362 *
1363 * FUNCTION: Create a special file (device)
1364 */
jfs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)1365 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1366 umode_t mode, dev_t rdev)
1367 {
1368 struct jfs_inode_info *jfs_ip;
1369 struct btstack btstack;
1370 struct component_name dname;
1371 ino_t ino;
1372 struct inode *ip;
1373 struct inode *iplist[2];
1374 int rc;
1375 tid_t tid;
1376 struct tblock *tblk;
1377
1378 jfs_info("jfs_mknod: %pd", dentry);
1379
1380 rc = dquot_initialize(dir);
1381 if (rc)
1382 goto out;
1383
1384 if ((rc = get_UCSname(&dname, dentry)))
1385 goto out;
1386
1387 ip = ialloc(dir, mode);
1388 if (IS_ERR(ip)) {
1389 rc = PTR_ERR(ip);
1390 goto out1;
1391 }
1392 jfs_ip = JFS_IP(ip);
1393
1394 tid = txBegin(dir->i_sb, 0);
1395
1396 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1397 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1398
1399 rc = jfs_init_acl(tid, ip, dir);
1400 if (rc)
1401 goto out3;
1402
1403 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1404 if (rc) {
1405 txAbort(tid, 0);
1406 goto out3;
1407 }
1408
1409 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1410 txAbort(tid, 0);
1411 goto out3;
1412 }
1413
1414 tblk = tid_to_tblock(tid);
1415 tblk->xflag |= COMMIT_CREATE;
1416 tblk->ino = ip->i_ino;
1417 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1418
1419 ino = ip->i_ino;
1420 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1421 txAbort(tid, 0);
1422 goto out3;
1423 }
1424
1425 ip->i_op = &jfs_file_inode_operations;
1426 jfs_ip->dev = new_encode_dev(rdev);
1427 init_special_inode(ip, ip->i_mode, rdev);
1428
1429 mark_inode_dirty(ip);
1430
1431 dir->i_ctime = dir->i_mtime = current_time(dir);
1432
1433 mark_inode_dirty(dir);
1434
1435 iplist[0] = dir;
1436 iplist[1] = ip;
1437 rc = txCommit(tid, 2, iplist, 0);
1438
1439 out3:
1440 txEnd(tid);
1441 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1442 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1443 if (rc) {
1444 free_ea_wmap(ip);
1445 clear_nlink(ip);
1446 discard_new_inode(ip);
1447 } else {
1448 d_instantiate_new(dentry, ip);
1449 }
1450
1451 out1:
1452 free_UCSname(&dname);
1453
1454 out:
1455 jfs_info("jfs_mknod: returning %d", rc);
1456 return rc;
1457 }
1458
jfs_lookup(struct inode * dip,struct dentry * dentry,unsigned int flags)1459 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1460 {
1461 struct btstack btstack;
1462 ino_t inum;
1463 struct inode *ip;
1464 struct component_name key;
1465 int rc;
1466
1467 jfs_info("jfs_lookup: name = %pd", dentry);
1468
1469 if ((rc = get_UCSname(&key, dentry)))
1470 return ERR_PTR(rc);
1471 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1472 free_UCSname(&key);
1473 if (rc == -ENOENT) {
1474 ip = NULL;
1475 } else if (rc) {
1476 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1477 ip = ERR_PTR(rc);
1478 } else {
1479 ip = jfs_iget(dip->i_sb, inum);
1480 if (IS_ERR(ip))
1481 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1482 }
1483
1484 return d_splice_alias(ip, dentry);
1485 }
1486
jfs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)1487 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1488 u64 ino, u32 generation)
1489 {
1490 struct inode *inode;
1491
1492 if (ino == 0)
1493 return ERR_PTR(-ESTALE);
1494 inode = jfs_iget(sb, ino);
1495 if (IS_ERR(inode))
1496 return ERR_CAST(inode);
1497
1498 if (generation && inode->i_generation != generation) {
1499 iput(inode);
1500 return ERR_PTR(-ESTALE);
1501 }
1502
1503 return inode;
1504 }
1505
jfs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1506 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1507 int fh_len, int fh_type)
1508 {
1509 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1510 jfs_nfs_get_inode);
1511 }
1512
jfs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1513 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1514 int fh_len, int fh_type)
1515 {
1516 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1517 jfs_nfs_get_inode);
1518 }
1519
jfs_get_parent(struct dentry * dentry)1520 struct dentry *jfs_get_parent(struct dentry *dentry)
1521 {
1522 unsigned long parent_ino;
1523
1524 parent_ino =
1525 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1526
1527 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1528 }
1529
1530 const struct inode_operations jfs_dir_inode_operations = {
1531 .create = jfs_create,
1532 .lookup = jfs_lookup,
1533 .link = jfs_link,
1534 .unlink = jfs_unlink,
1535 .symlink = jfs_symlink,
1536 .mkdir = jfs_mkdir,
1537 .rmdir = jfs_rmdir,
1538 .mknod = jfs_mknod,
1539 .rename = jfs_rename,
1540 .listxattr = jfs_listxattr,
1541 .setattr = jfs_setattr,
1542 #ifdef CONFIG_JFS_POSIX_ACL
1543 .get_acl = jfs_get_acl,
1544 .set_acl = jfs_set_acl,
1545 #endif
1546 };
1547
1548 const struct file_operations jfs_dir_operations = {
1549 .read = generic_read_dir,
1550 .iterate = jfs_readdir,
1551 .fsync = jfs_fsync,
1552 .unlocked_ioctl = jfs_ioctl,
1553 #ifdef CONFIG_COMPAT
1554 .compat_ioctl = jfs_compat_ioctl,
1555 #endif
1556 .llseek = generic_file_llseek,
1557 };
1558
jfs_ci_hash(const struct dentry * dir,struct qstr * this)1559 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1560 {
1561 unsigned long hash;
1562 int i;
1563
1564 hash = init_name_hash(dir);
1565 for (i=0; i < this->len; i++)
1566 hash = partial_name_hash(tolower(this->name[i]), hash);
1567 this->hash = end_name_hash(hash);
1568
1569 return 0;
1570 }
1571
jfs_ci_compare(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)1572 static int jfs_ci_compare(const struct dentry *dentry,
1573 unsigned int len, const char *str, const struct qstr *name)
1574 {
1575 int i, result = 1;
1576
1577 if (len != name->len)
1578 goto out;
1579 for (i=0; i < len; i++) {
1580 if (tolower(str[i]) != tolower(name->name[i]))
1581 goto out;
1582 }
1583 result = 0;
1584 out:
1585 return result;
1586 }
1587
jfs_ci_revalidate(struct dentry * dentry,unsigned int flags)1588 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1589 {
1590 /*
1591 * This is not negative dentry. Always valid.
1592 *
1593 * Note, rename() to existing directory entry will have ->d_inode,
1594 * and will use existing name which isn't specified name by user.
1595 *
1596 * We may be able to drop this positive dentry here. But dropping
1597 * positive dentry isn't good idea. So it's unsupported like
1598 * rename("filename", "FILENAME") for now.
1599 */
1600 if (d_really_is_positive(dentry))
1601 return 1;
1602
1603 /*
1604 * This may be nfsd (or something), anyway, we can't see the
1605 * intent of this. So, since this can be for creation, drop it.
1606 */
1607 if (!flags)
1608 return 0;
1609
1610 /*
1611 * Drop the negative dentry, in order to make sure to use the
1612 * case sensitive name which is specified by user if this is
1613 * for creation.
1614 */
1615 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1616 return 0;
1617 return 1;
1618 }
1619
1620 const struct dentry_operations jfs_ci_dentry_operations =
1621 {
1622 .d_hash = jfs_ci_hash,
1623 .d_compare = jfs_ci_compare,
1624 .d_revalidate = jfs_ci_revalidate,
1625 };
1626