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[PATCH] s390: fix typo in stop_hz_timer.
[linux/fpc-iii.git] / fs / jfs / namei.c
blob09ea03f622778a0d5c568db9192eec9e2ea5ceb9
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/ctype.h>
22 #include <linux/quotaops.h>
23 #include "jfs_incore.h"
24 #include "jfs_superblock.h"
25 #include "jfs_inode.h"
26 #include "jfs_dinode.h"
27 #include "jfs_dmap.h"
28 #include "jfs_unicode.h"
29 #include "jfs_metapage.h"
30 #include "jfs_xattr.h"
31 #include "jfs_acl.h"
32 #include "jfs_debug.h"
33
34 /*
35 * forward references
36 */
37 struct dentry_operations jfs_ci_dentry_operations;
38
39 static s64 commitZeroLink(tid_t, struct inode *);
40
41 /*
42 * NAME: free_ea_wmap(inode)
43 *
44 * FUNCTION: free uncommitted extended attributes from working map
45 *
46 */
47 static inline void free_ea_wmap(struct inode *inode)
48 {
49 dxd_t *ea = &JFS_IP(inode)->ea;
50
51 if (ea->flag & DXD_EXTENT) {
52 /* free EA pages from cache */
53 invalidate_dxd_metapages(inode, *ea);
54 dbFree(inode, addressDXD(ea), lengthDXD(ea));
55 }
56 ea->flag = 0;
57 }
58
59 /*
60 * NAME: jfs_create(dip, dentry, mode)
61 *
62 * FUNCTION: create a regular file in the parent directory <dip>
63 * with name = <from dentry> and mode = <mode>
64 *
65 * PARAMETER: dip - parent directory vnode
66 * dentry - dentry of new file
67 * mode - create mode (rwxrwxrwx).
68 * nd- nd struct
69 *
70 * RETURN: Errors from subroutines
71 *
72 */
73 static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
74 struct nameidata *nd)
75 {
76 int rc = 0;
77 tid_t tid; /* transaction id */
78 struct inode *ip = NULL; /* child directory inode */
79 ino_t ino;
80 struct component_name dname; /* child directory name */
81 struct btstack btstack;
82 struct inode *iplist[2];
83 struct tblock *tblk;
84
85 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
86
87 /*
88 * search parent directory for entry/freespace
89 * (dtSearch() returns parent directory page pinned)
90 */
91 if ((rc = get_UCSname(&dname, dentry)))
92 goto out1;
93
94 /*
95 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
96 * block there while holding dtree page, so we allocate the inode &
97 * begin the transaction before we search the directory.
98 */
99 ip = ialloc(dip, mode);
100 if (ip == NULL) {
101 rc = -ENOSPC;
102 goto out2;
103 }
104
105 tid = txBegin(dip->i_sb, 0);
106
107 mutex_lock(&JFS_IP(dip)->commit_mutex);
108 mutex_lock(&JFS_IP(ip)->commit_mutex);
109
110 rc = jfs_init_acl(tid, ip, dip);
111 if (rc)
112 goto out3;
113
114 rc = jfs_init_security(tid, ip, dip);
115 if (rc) {
116 txAbort(tid, 0);
117 goto out3;
118 }
119
120 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
121 jfs_err("jfs_create: dtSearch returned %d", rc);
122 txAbort(tid, 0);
123 goto out3;
124 }
125
126 tblk = tid_to_tblock(tid);
127 tblk->xflag |= COMMIT_CREATE;
128 tblk->ino = ip->i_ino;
129 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
130
131 iplist[0] = dip;
132 iplist[1] = ip;
133
134 /*
135 * initialize the child XAD tree root in-line in inode
136 */
137 xtInitRoot(tid, ip);
138
139 /*
140 * create entry in parent directory for child directory
141 * (dtInsert() releases parent directory page)
142 */
143 ino = ip->i_ino;
144 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
145 if (rc == -EIO) {
146 jfs_err("jfs_create: dtInsert returned -EIO");
147 txAbort(tid, 1); /* Marks Filesystem dirty */
148 } else
149 txAbort(tid, 0); /* Filesystem full */
150 goto out3;
151 }
152
153 ip->i_op = &jfs_file_inode_operations;
154 ip->i_fop = &jfs_file_operations;
155 ip->i_mapping->a_ops = &jfs_aops;
156
157 insert_inode_hash(ip);
158 mark_inode_dirty(ip);
159
160 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
161
162 mark_inode_dirty(dip);
163
164 rc = txCommit(tid, 2, &iplist[0], 0);
165
166 out3:
167 txEnd(tid);
168 mutex_unlock(&JFS_IP(dip)->commit_mutex);
169 mutex_unlock(&JFS_IP(ip)->commit_mutex);
170 if (rc) {
171 free_ea_wmap(ip);
172 ip->i_nlink = 0;
173 iput(ip);
174 } else
175 d_instantiate(dentry, ip);
176
177 out2:
178 free_UCSname(&dname);
179
180 out1:
181
182 jfs_info("jfs_create: rc:%d", rc);
183 return rc;
184 }
185
186
187 /*
188 * NAME: jfs_mkdir(dip, dentry, mode)
189 *
190 * FUNCTION: create a child directory in the parent directory <dip>
191 * with name = <from dentry> and mode = <mode>
192 *
193 * PARAMETER: dip - parent directory vnode
194 * dentry - dentry of child directory
195 * mode - create mode (rwxrwxrwx).
196 *
197 * RETURN: Errors from subroutines
198 *
199 * note:
200 * EACCESS: user needs search+write permission on the parent directory
201 */
202 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
203 {
204 int rc = 0;
205 tid_t tid; /* transaction id */
206 struct inode *ip = NULL; /* child directory inode */
207 ino_t ino;
208 struct component_name dname; /* child directory name */
209 struct btstack btstack;
210 struct inode *iplist[2];
211 struct tblock *tblk;
212
213 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
214
215 /* link count overflow on parent directory ? */
216 if (dip->i_nlink == JFS_LINK_MAX) {
217 rc = -EMLINK;
218 goto out1;
219 }
220
221 /*
222 * search parent directory for entry/freespace
223 * (dtSearch() returns parent directory page pinned)
224 */
225 if ((rc = get_UCSname(&dname, dentry)))
226 goto out1;
227
228 /*
229 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
230 * block there while holding dtree page, so we allocate the inode &
231 * begin the transaction before we search the directory.
232 */
233 ip = ialloc(dip, S_IFDIR | mode);
234 if (ip == NULL) {
235 rc = -ENOSPC;
236 goto out2;
237 }
238
239 tid = txBegin(dip->i_sb, 0);
240
241 mutex_lock(&JFS_IP(dip)->commit_mutex);
242 mutex_lock(&JFS_IP(ip)->commit_mutex);
243
244 rc = jfs_init_acl(tid, ip, dip);
245 if (rc)
246 goto out3;
247
248 rc = jfs_init_security(tid, ip, dip);
249 if (rc) {
250 txAbort(tid, 0);
251 goto out3;
252 }
253
254 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
255 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
256 txAbort(tid, 0);
257 goto out3;
258 }
259
260 tblk = tid_to_tblock(tid);
261 tblk->xflag |= COMMIT_CREATE;
262 tblk->ino = ip->i_ino;
263 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
264
265 iplist[0] = dip;
266 iplist[1] = ip;
267
268 /*
269 * initialize the child directory in-line in inode
270 */
271 dtInitRoot(tid, ip, dip->i_ino);
272
273 /*
274 * create entry in parent directory for child directory
275 * (dtInsert() releases parent directory page)
276 */
277 ino = ip->i_ino;
278 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
279 if (rc == -EIO) {
280 jfs_err("jfs_mkdir: dtInsert returned -EIO");
281 txAbort(tid, 1); /* Marks Filesystem dirty */
282 } else
283 txAbort(tid, 0); /* Filesystem full */
284 goto out3;
285 }
286
287 ip->i_nlink = 2; /* for '.' */
288 ip->i_op = &jfs_dir_inode_operations;
289 ip->i_fop = &jfs_dir_operations;
290
291 insert_inode_hash(ip);
292 mark_inode_dirty(ip);
293
294 /* update parent directory inode */
295 dip->i_nlink++; /* for '..' from child directory */
296 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
297 mark_inode_dirty(dip);
298
299 rc = txCommit(tid, 2, &iplist[0], 0);
300
301 out3:
302 txEnd(tid);
303 mutex_unlock(&JFS_IP(dip)->commit_mutex);
304 mutex_unlock(&JFS_IP(ip)->commit_mutex);
305 if (rc) {
306 free_ea_wmap(ip);
307 ip->i_nlink = 0;
308 iput(ip);
309 } else
310 d_instantiate(dentry, ip);
311
312 out2:
313 free_UCSname(&dname);
314
315
316 out1:
317
318 jfs_info("jfs_mkdir: rc:%d", rc);
319 return rc;
320 }
321
322 /*
323 * NAME: jfs_rmdir(dip, dentry)
324 *
325 * FUNCTION: remove a link to child directory
326 *
327 * PARAMETER: dip - parent inode
328 * dentry - child directory dentry
329 *
330 * RETURN: -EINVAL - if name is . or ..
331 * -EINVAL - if . or .. exist but are invalid.
332 * errors from subroutines
333 *
334 * note:
335 * if other threads have the directory open when the last link
336 * is removed, the "." and ".." entries, if present, are removed before
337 * rmdir() returns and no new entries may be created in the directory,
338 * but the directory is not removed until the last reference to
339 * the directory is released (cf.unlink() of regular file).
340 */
341 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
342 {
343 int rc;
344 tid_t tid; /* transaction id */
345 struct inode *ip = dentry->d_inode;
346 ino_t ino;
347 struct component_name dname;
348 struct inode *iplist[2];
349 struct tblock *tblk;
350
351 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
352
353 /* Init inode for quota operations. */
354 DQUOT_INIT(ip);
355
356 /* directory must be empty to be removed */
357 if (!dtEmpty(ip)) {
358 rc = -ENOTEMPTY;
359 goto out;
360 }
361
362 if ((rc = get_UCSname(&dname, dentry))) {
363 goto out;
364 }
365
366 tid = txBegin(dip->i_sb, 0);
367
368 mutex_lock(&JFS_IP(dip)->commit_mutex);
369 mutex_lock(&JFS_IP(ip)->commit_mutex);
370
371 iplist[0] = dip;
372 iplist[1] = ip;
373
374 tblk = tid_to_tblock(tid);
375 tblk->xflag |= COMMIT_DELETE;
376 tblk->u.ip = ip;
377
378 /*
379 * delete the entry of target directory from parent directory
380 */
381 ino = ip->i_ino;
382 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
383 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
384 if (rc == -EIO)
385 txAbort(tid, 1);
386 txEnd(tid);
387 mutex_unlock(&JFS_IP(dip)->commit_mutex);
388 mutex_unlock(&JFS_IP(ip)->commit_mutex);
389
390 goto out2;
391 }
392
393 /* update parent directory's link count corresponding
394 * to ".." entry of the target directory deleted
395 */
396 dip->i_nlink--;
397 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
398 mark_inode_dirty(dip);
399
400 /*
401 * OS/2 could have created EA and/or ACL
402 */
403 /* free EA from both persistent and working map */
404 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
405 /* free EA pages */
406 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
407 }
408 JFS_IP(ip)->ea.flag = 0;
409
410 /* free ACL from both persistent and working map */
411 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
412 /* free ACL pages */
413 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
414 }
415 JFS_IP(ip)->acl.flag = 0;
416
417 /* mark the target directory as deleted */
418 ip->i_nlink = 0;
419 mark_inode_dirty(ip);
420
421 rc = txCommit(tid, 2, &iplist[0], 0);
422
423 txEnd(tid);
424
425 mutex_unlock(&JFS_IP(dip)->commit_mutex);
426 mutex_unlock(&JFS_IP(ip)->commit_mutex);
427
428 /*
429 * Truncating the directory index table is not guaranteed. It
430 * may need to be done iteratively
431 */
432 if (test_cflag(COMMIT_Stale, dip)) {
433 if (dip->i_size > 1)
434 jfs_truncate_nolock(dip, 0);
435
436 clear_cflag(COMMIT_Stale, dip);
437 }
438
439 out2:
440 free_UCSname(&dname);
441
442 out:
443 jfs_info("jfs_rmdir: rc:%d", rc);
444 return rc;
445 }
446
447 /*
448 * NAME: jfs_unlink(dip, dentry)
449 *
450 * FUNCTION: remove a link to object <vp> named by <name>
451 * from parent directory <dvp>
452 *
453 * PARAMETER: dip - inode of parent directory
454 * dentry - dentry of object to be removed
455 *
456 * RETURN: errors from subroutines
457 *
458 * note:
459 * temporary file: if one or more processes have the file open
460 * when the last link is removed, the link will be removed before
461 * unlink() returns, but the removal of the file contents will be
462 * postponed until all references to the files are closed.
463 *
464 * JFS does NOT support unlink() on directories.
465 *
466 */
467 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
468 {
469 int rc;
470 tid_t tid; /* transaction id */
471 struct inode *ip = dentry->d_inode;
472 ino_t ino;
473 struct component_name dname; /* object name */
474 struct inode *iplist[2];
475 struct tblock *tblk;
476 s64 new_size = 0;
477 int commit_flag;
478
479 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
480
481 /* Init inode for quota operations. */
482 DQUOT_INIT(ip);
483
484 if ((rc = get_UCSname(&dname, dentry)))
485 goto out;
486
487 IWRITE_LOCK(ip);
488
489 tid = txBegin(dip->i_sb, 0);
490
491 mutex_lock(&JFS_IP(dip)->commit_mutex);
492 mutex_lock(&JFS_IP(ip)->commit_mutex);
493
494 iplist[0] = dip;
495 iplist[1] = ip;
496
497 /*
498 * delete the entry of target file from parent directory
499 */
500 ino = ip->i_ino;
501 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
502 jfs_err("jfs_unlink: dtDelete returned %d", rc);
503 if (rc == -EIO)
504 txAbort(tid, 1); /* Marks FS Dirty */
505 txEnd(tid);
506 mutex_unlock(&JFS_IP(dip)->commit_mutex);
507 mutex_unlock(&JFS_IP(ip)->commit_mutex);
508 IWRITE_UNLOCK(ip);
509 goto out1;
510 }
511
512 ASSERT(ip->i_nlink);
513
514 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
515 mark_inode_dirty(dip);
516
517 /* update target's inode */
518 ip->i_nlink--;
519 mark_inode_dirty(ip);
520
521 /*
522 * commit zero link count object
523 */
524 if (ip->i_nlink == 0) {
525 assert(!test_cflag(COMMIT_Nolink, ip));
526 /* free block resources */
527 if ((new_size = commitZeroLink(tid, ip)) < 0) {
528 txAbort(tid, 1); /* Marks FS Dirty */
529 txEnd(tid);
530 mutex_unlock(&JFS_IP(dip)->commit_mutex);
531 mutex_unlock(&JFS_IP(ip)->commit_mutex);
532 IWRITE_UNLOCK(ip);
533 rc = new_size;
534 goto out1;
535 }
536 tblk = tid_to_tblock(tid);
537 tblk->xflag |= COMMIT_DELETE;
538 tblk->u.ip = ip;
539 }
540
541 /*
542 * Incomplete truncate of file data can
543 * result in timing problems unless we synchronously commit the
544 * transaction.
545 */
546 if (new_size)
547 commit_flag = COMMIT_SYNC;
548 else
549 commit_flag = 0;
550
551 /*
552 * If xtTruncate was incomplete, commit synchronously to avoid
553 * timing complications
554 */
555 rc = txCommit(tid, 2, &iplist[0], commit_flag);
556
557 txEnd(tid);
558
559 mutex_unlock(&JFS_IP(dip)->commit_mutex);
560 mutex_unlock(&JFS_IP(ip)->commit_mutex);
561
562
563 while (new_size && (rc == 0)) {
564 tid = txBegin(dip->i_sb, 0);
565 mutex_lock(&JFS_IP(ip)->commit_mutex);
566 new_size = xtTruncate_pmap(tid, ip, new_size);
567 if (new_size < 0) {
568 txAbort(tid, 1); /* Marks FS Dirty */
569 rc = new_size;
570 } else
571 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
572 txEnd(tid);
573 mutex_unlock(&JFS_IP(ip)->commit_mutex);
574 }
575
576 if (ip->i_nlink == 0)
577 set_cflag(COMMIT_Nolink, ip);
578
579 IWRITE_UNLOCK(ip);
580
581 /*
582 * Truncating the directory index table is not guaranteed. It
583 * may need to be done iteratively
584 */
585 if (test_cflag(COMMIT_Stale, dip)) {
586 if (dip->i_size > 1)
587 jfs_truncate_nolock(dip, 0);
588
589 clear_cflag(COMMIT_Stale, dip);
590 }
591
592 out1:
593 free_UCSname(&dname);
594 out:
595 jfs_info("jfs_unlink: rc:%d", rc);
596 return rc;
597 }
598
599 /*
600 * NAME: commitZeroLink()
601 *
602 * FUNCTION: for non-directory, called by jfs_remove(),
603 * truncate a regular file, directory or symbolic
604 * link to zero length. return 0 if type is not
605 * one of these.
606 *
607 * if the file is currently associated with a VM segment
608 * only permanent disk and inode map resources are freed,
609 * and neither the inode nor indirect blocks are modified
610 * so that the resources can be later freed in the work
611 * map by ctrunc1.
612 * if there is no VM segment on entry, the resources are
613 * freed in both work and permanent map.
614 * (? for temporary file - memory object is cached even
615 * after no reference:
616 * reference count > 0 - )
617 *
618 * PARAMETERS: cd - pointer to commit data structure.
619 * current inode is the one to truncate.
620 *
621 * RETURN: Errors from subroutines
622 */
623 static s64 commitZeroLink(tid_t tid, struct inode *ip)
624 {
625 int filetype;
626 struct tblock *tblk;
627
628 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
629
630 filetype = ip->i_mode & S_IFMT;
631 switch (filetype) {
632 case S_IFREG:
633 break;
634 case S_IFLNK:
635 /* fast symbolic link */
636 if (ip->i_size < IDATASIZE) {
637 ip->i_size = 0;
638 return 0;
639 }
640 break;
641 default:
642 assert(filetype != S_IFDIR);
643 return 0;
644 }
645
646 set_cflag(COMMIT_Freewmap, ip);
647
648 /* mark transaction of block map update type */
649 tblk = tid_to_tblock(tid);
650 tblk->xflag |= COMMIT_PMAP;
651
652 /*
653 * free EA
654 */
655 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
656 /* acquire maplock on EA to be freed from block map */
657 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
658
659 /*
660 * free ACL
661 */
662 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
663 /* acquire maplock on EA to be freed from block map */
664 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
665
666 /*
667 * free xtree/data (truncate to zero length):
668 * free xtree/data pages from cache if COMMIT_PWMAP,
669 * free xtree/data blocks from persistent block map, and
670 * free xtree/data blocks from working block map if COMMIT_PWMAP;
671 */
672 if (ip->i_size)
673 return xtTruncate_pmap(tid, ip, 0);
674
675 return 0;
676 }
677
678
679 /*
680 * NAME: jfs_free_zero_link()
681 *
682 * FUNCTION: for non-directory, called by iClose(),
683 * free resources of a file from cache and WORKING map
684 * for a file previously committed with zero link count
685 * while associated with a pager object,
686 *
687 * PARAMETER: ip - pointer to inode of file.
688 */
689 void jfs_free_zero_link(struct inode *ip)
690 {
691 int type;
692
693 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
694
695 /* return if not reg or symbolic link or if size is
696 * already ok.
697 */
698 type = ip->i_mode & S_IFMT;
699
700 switch (type) {
701 case S_IFREG:
702 break;
703 case S_IFLNK:
704 /* if its contained in inode nothing to do */
705 if (ip->i_size < IDATASIZE)
706 return;
707 break;
708 default:
709 return;
710 }
711
712 /*
713 * free EA
714 */
715 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
716 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
717 int xlen = lengthDXD(&JFS_IP(ip)->ea);
718 struct maplock maplock; /* maplock for COMMIT_WMAP */
719 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
720
721 /* free EA pages from cache */
722 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
723
724 /* free EA extent from working block map */
725 maplock.index = 1;
726 pxdlock = (struct pxd_lock *) & maplock;
727 pxdlock->flag = mlckFREEPXD;
728 PXDaddress(&pxdlock->pxd, xaddr);
729 PXDlength(&pxdlock->pxd, xlen);
730 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
731 }
732
733 /*
734 * free ACL
735 */
736 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
737 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
738 int xlen = lengthDXD(&JFS_IP(ip)->acl);
739 struct maplock maplock; /* maplock for COMMIT_WMAP */
740 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
741
742 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
743
744 /* free ACL extent from working block map */
745 maplock.index = 1;
746 pxdlock = (struct pxd_lock *) & maplock;
747 pxdlock->flag = mlckFREEPXD;
748 PXDaddress(&pxdlock->pxd, xaddr);
749 PXDlength(&pxdlock->pxd, xlen);
750 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
751 }
752
753 /*
754 * free xtree/data (truncate to zero length):
755 * free xtree/data pages from cache, and
756 * free xtree/data blocks from working block map;
757 */
758 if (ip->i_size)
759 xtTruncate(0, ip, 0, COMMIT_WMAP);
760 }
761
762 /*
763 * NAME: jfs_link(vp, dvp, name, crp)
764 *
765 * FUNCTION: create a link to <vp> by the name = <name>
766 * in the parent directory <dvp>
767 *
768 * PARAMETER: vp - target object
769 * dvp - parent directory of new link
770 * name - name of new link to target object
771 * crp - credential
772 *
773 * RETURN: Errors from subroutines
774 *
775 * note:
776 * JFS does NOT support link() on directories (to prevent circular
777 * path in the directory hierarchy);
778 * EPERM: the target object is a directory, and either the caller
779 * does not have appropriate privileges or the implementation prohibits
780 * using link() on directories [XPG4.2].
781 *
782 * JFS does NOT support links between file systems:
783 * EXDEV: target object and new link are on different file systems and
784 * implementation does not support links between file systems [XPG4.2].
785 */
786 static int jfs_link(struct dentry *old_dentry,
787 struct inode *dir, struct dentry *dentry)
788 {
789 int rc;
790 tid_t tid;
791 struct inode *ip = old_dentry->d_inode;
792 ino_t ino;
793 struct component_name dname;
794 struct btstack btstack;
795 struct inode *iplist[2];
796
797 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
798 dentry->d_name.name);
799
800 if (ip->i_nlink == JFS_LINK_MAX)
801 return -EMLINK;
802
803 if (ip->i_nlink == 0)
804 return -ENOENT;
805
806 tid = txBegin(ip->i_sb, 0);
807
808 mutex_lock(&JFS_IP(dir)->commit_mutex);
809 mutex_lock(&JFS_IP(ip)->commit_mutex);
810
811 /*
812 * scan parent directory for entry/freespace
813 */
814 if ((rc = get_UCSname(&dname, dentry)))
815 goto out;
816
817 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
818 goto free_dname;
819
820 /*
821 * create entry for new link in parent directory
822 */
823 ino = ip->i_ino;
824 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
825 goto free_dname;
826
827 /* update object inode */
828 ip->i_nlink++; /* for new link */
829 ip->i_ctime = CURRENT_TIME;
830 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
831 mark_inode_dirty(dir);
832 atomic_inc(&ip->i_count);
833
834 iplist[0] = ip;
835 iplist[1] = dir;
836 rc = txCommit(tid, 2, &iplist[0], 0);
837
838 if (rc) {
839 ip->i_nlink--;
840 iput(ip);
841 } else
842 d_instantiate(dentry, ip);
843
844 free_dname:
845 free_UCSname(&dname);
846
847 out:
848 txEnd(tid);
849
850 mutex_unlock(&JFS_IP(dir)->commit_mutex);
851 mutex_unlock(&JFS_IP(ip)->commit_mutex);
852
853 jfs_info("jfs_link: rc:%d", rc);
854 return rc;
855 }
856
857 /*
858 * NAME: jfs_symlink(dip, dentry, name)
859 *
860 * FUNCTION: creates a symbolic link to <symlink> by name <name>
861 * in directory <dip>
862 *
863 * PARAMETER: dip - parent directory vnode
864 * dentry - dentry of symbolic link
865 * name - the path name of the existing object
866 * that will be the source of the link
867 *
868 * RETURN: errors from subroutines
869 *
870 * note:
871 * ENAMETOOLONG: pathname resolution of a symbolic link produced
872 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
873 */
874
875 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
876 const char *name)
877 {
878 int rc;
879 tid_t tid;
880 ino_t ino = 0;
881 struct component_name dname;
882 int ssize; /* source pathname size */
883 struct btstack btstack;
884 struct inode *ip = dentry->d_inode;
885 unchar *i_fastsymlink;
886 s64 xlen = 0;
887 int bmask = 0, xsize;
888 s64 extent = 0, xaddr;
889 struct metapage *mp;
890 struct super_block *sb;
891 struct tblock *tblk;
892
893 struct inode *iplist[2];
894
895 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
896
897 ssize = strlen(name) + 1;
898
899 /*
900 * search parent directory for entry/freespace
901 * (dtSearch() returns parent directory page pinned)
902 */
903
904 if ((rc = get_UCSname(&dname, dentry)))
905 goto out1;
906
907 /*
908 * allocate on-disk/in-memory inode for symbolic link:
909 * (iAlloc() returns new, locked inode)
910 */
911 ip = ialloc(dip, S_IFLNK | 0777);
912 if (ip == NULL) {
913 rc = -ENOSPC;
914 goto out2;
915 }
916
917 tid = txBegin(dip->i_sb, 0);
918
919 mutex_lock(&JFS_IP(dip)->commit_mutex);
920 mutex_lock(&JFS_IP(ip)->commit_mutex);
921
922 rc = jfs_init_security(tid, ip, dip);
923 if (rc)
924 goto out3;
925
926 tblk = tid_to_tblock(tid);
927 tblk->xflag |= COMMIT_CREATE;
928 tblk->ino = ip->i_ino;
929 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
930
931 /* fix symlink access permission
932 * (dir_create() ANDs in the u.u_cmask,
933 * but symlinks really need to be 777 access)
934 */
935 ip->i_mode |= 0777;
936
937 /*
938 * write symbolic link target path name
939 */
940 xtInitRoot(tid, ip);
941
942 /*
943 * write source path name inline in on-disk inode (fast symbolic link)
944 */
945
946 if (ssize <= IDATASIZE) {
947 ip->i_op = &jfs_symlink_inode_operations;
948
949 i_fastsymlink = JFS_IP(ip)->i_inline;
950 memcpy(i_fastsymlink, name, ssize);
951 ip->i_size = ssize - 1;
952
953 /*
954 * if symlink is > 128 bytes, we don't have the space to
955 * store inline extended attributes
956 */
957 if (ssize > sizeof (JFS_IP(ip)->i_inline))
958 JFS_IP(ip)->mode2 &= ~INLINEEA;
959
960 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
961 ssize, name);
962 }
963 /*
964 * write source path name in a single extent
965 */
966 else {
967 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
968
969 ip->i_op = &page_symlink_inode_operations;
970 ip->i_mapping->a_ops = &jfs_aops;
971
972 /*
973 * even though the data of symlink object (source
974 * path name) is treated as non-journaled user data,
975 * it is read/written thru buffer cache for performance.
976 */
977 sb = ip->i_sb;
978 bmask = JFS_SBI(sb)->bsize - 1;
979 xsize = (ssize + bmask) & ~bmask;
980 xaddr = 0;
981 xlen = xsize >> JFS_SBI(sb)->l2bsize;
982 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
983 txAbort(tid, 0);
984 rc = -ENOSPC;
985 goto out3;
986 }
987 extent = xaddr;
988 ip->i_size = ssize - 1;
989 while (ssize) {
990 /* This is kind of silly since PATH_MAX == 4K */
991 int copy_size = min(ssize, PSIZE);
992
993 mp = get_metapage(ip, xaddr, PSIZE, 1);
994
995 if (mp == NULL) {
996 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
997 rc = -EIO;
998 txAbort(tid, 0);
999 goto out3;
1000 }
1001 memcpy(mp->data, name, copy_size);
1002 flush_metapage(mp);
1003 ssize -= copy_size;
1004 name += copy_size;
1005 xaddr += JFS_SBI(sb)->nbperpage;
1006 }
1007 }
1008
1009 /*
1010 * create entry for symbolic link in parent directory
1011 */
1012 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1013 if (rc == 0) {
1014 ino = ip->i_ino;
1015 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1016 }
1017 if (rc) {
1018 if (xlen)
1019 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1020 txAbort(tid, 0);
1021 /* discard new inode */
1022 goto out3;
1023 }
1024
1025 insert_inode_hash(ip);
1026 mark_inode_dirty(ip);
1027
1028 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1029 mark_inode_dirty(dip);
1030 /*
1031 * commit update of parent directory and link object
1032 */
1033
1034 iplist[0] = dip;
1035 iplist[1] = ip;
1036 rc = txCommit(tid, 2, &iplist[0], 0);
1037
1038 out3:
1039 txEnd(tid);
1040 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1041 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1042 if (rc) {
1043 free_ea_wmap(ip);
1044 ip->i_nlink = 0;
1045 iput(ip);
1046 } else
1047 d_instantiate(dentry, ip);
1048
1049 out2:
1050 free_UCSname(&dname);
1051
1052 out1:
1053 jfs_info("jfs_symlink: rc:%d", rc);
1054 return rc;
1055 }
1056
1057
1058 /*
1059 * NAME: jfs_rename
1060 *
1061 * FUNCTION: rename a file or directory
1062 */
1063 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1064 struct inode *new_dir, struct dentry *new_dentry)
1065 {
1066 struct btstack btstack;
1067 ino_t ino;
1068 struct component_name new_dname;
1069 struct inode *new_ip;
1070 struct component_name old_dname;
1071 struct inode *old_ip;
1072 int rc;
1073 tid_t tid;
1074 struct tlock *tlck;
1075 struct dt_lock *dtlck;
1076 struct lv *lv;
1077 int ipcount;
1078 struct inode *iplist[4];
1079 struct tblock *tblk;
1080 s64 new_size = 0;
1081 int commit_flag;
1082
1083
1084 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1085 new_dentry->d_name.name);
1086
1087 old_ip = old_dentry->d_inode;
1088 new_ip = new_dentry->d_inode;
1089
1090 if ((rc = get_UCSname(&old_dname, old_dentry)))
1091 goto out1;
1092
1093 if ((rc = get_UCSname(&new_dname, new_dentry)))
1094 goto out2;
1095
1096 /*
1097 * Make sure source inode number is what we think it is
1098 */
1099 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1100 if (rc || (ino != old_ip->i_ino)) {
1101 rc = -ENOENT;
1102 goto out3;
1103 }
1104
1105 /*
1106 * Make sure dest inode number (if any) is what we think it is
1107 */
1108 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1109 if (rc == 0) {
1110 if ((new_ip == 0) || (ino != new_ip->i_ino)) {
1111 rc = -ESTALE;
1112 goto out3;
1113 }
1114 } else if (rc != -ENOENT)
1115 goto out3;
1116 else if (new_ip) {
1117 /* no entry exists, but one was expected */
1118 rc = -ESTALE;
1119 goto out3;
1120 }
1121
1122 if (S_ISDIR(old_ip->i_mode)) {
1123 if (new_ip) {
1124 if (!dtEmpty(new_ip)) {
1125 rc = -ENOTEMPTY;
1126 goto out3;
1127 }
1128 } else if ((new_dir != old_dir) &&
1129 (new_dir->i_nlink == JFS_LINK_MAX)) {
1130 rc = -EMLINK;
1131 goto out3;
1132 }
1133 } else if (new_ip) {
1134 IWRITE_LOCK(new_ip);
1135 /* Init inode for quota operations. */
1136 DQUOT_INIT(new_ip);
1137 }
1138
1139 /*
1140 * The real work starts here
1141 */
1142 tid = txBegin(new_dir->i_sb, 0);
1143
1144 mutex_lock(&JFS_IP(new_dir)->commit_mutex);
1145 mutex_lock(&JFS_IP(old_ip)->commit_mutex);
1146 if (old_dir != new_dir)
1147 mutex_lock(&JFS_IP(old_dir)->commit_mutex);
1148
1149 if (new_ip) {
1150 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1151 /*
1152 * Change existing directory entry to new inode number
1153 */
1154 ino = new_ip->i_ino;
1155 rc = dtModify(tid, new_dir, &new_dname, &ino,
1156 old_ip->i_ino, JFS_RENAME);
1157 if (rc)
1158 goto out4;
1159 new_ip->i_nlink--;
1160 if (S_ISDIR(new_ip->i_mode)) {
1161 new_ip->i_nlink--;
1162 if (new_ip->i_nlink) {
1163 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1164 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1165 if (old_dir != new_dir)
1166 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1167 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1168 IWRITE_UNLOCK(new_ip);
1169 jfs_error(new_ip->i_sb,
1170 "jfs_rename: new_ip->i_nlink != 0");
1171 return -EIO;
1172 }
1173 tblk = tid_to_tblock(tid);
1174 tblk->xflag |= COMMIT_DELETE;
1175 tblk->u.ip = new_ip;
1176 } else if (new_ip->i_nlink == 0) {
1177 assert(!test_cflag(COMMIT_Nolink, new_ip));
1178 /* free block resources */
1179 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1180 txAbort(tid, 1); /* Marks FS Dirty */
1181 rc = new_size;
1182 goto out4;
1183 }
1184 tblk = tid_to_tblock(tid);
1185 tblk->xflag |= COMMIT_DELETE;
1186 tblk->u.ip = new_ip;
1187 } else {
1188 new_ip->i_ctime = CURRENT_TIME;
1189 mark_inode_dirty(new_ip);
1190 }
1191 } else {
1192 /*
1193 * Add new directory entry
1194 */
1195 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1196 JFS_CREATE);
1197 if (rc) {
1198 jfs_err("jfs_rename didn't expect dtSearch to fail "
1199 "w/rc = %d", rc);
1200 goto out4;
1201 }
1202
1203 ino = old_ip->i_ino;
1204 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1205 if (rc) {
1206 if (rc == -EIO)
1207 jfs_err("jfs_rename: dtInsert returned -EIO");
1208 goto out4;
1209 }
1210 if (S_ISDIR(old_ip->i_mode))
1211 new_dir->i_nlink++;
1212 }
1213 /*
1214 * Remove old directory entry
1215 */
1216
1217 ino = old_ip->i_ino;
1218 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1219 if (rc) {
1220 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1221 rc);
1222 txAbort(tid, 1); /* Marks Filesystem dirty */
1223 goto out4;
1224 }
1225 if (S_ISDIR(old_ip->i_mode)) {
1226 old_dir->i_nlink--;
1227 if (old_dir != new_dir) {
1228 /*
1229 * Change inode number of parent for moved directory
1230 */
1231
1232 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1233 cpu_to_le32(new_dir->i_ino);
1234
1235 /* Linelock header of dtree */
1236 tlck = txLock(tid, old_ip,
1237 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1238 tlckDTREE | tlckBTROOT | tlckRELINK);
1239 dtlck = (struct dt_lock *) & tlck->lock;
1240 ASSERT(dtlck->index == 0);
1241 lv = & dtlck->lv[0];
1242 lv->offset = 0;
1243 lv->length = 1;
1244 dtlck->index++;
1245 }
1246 }
1247
1248 /*
1249 * Update ctime on changed/moved inodes & mark dirty
1250 */
1251 old_ip->i_ctime = CURRENT_TIME;
1252 mark_inode_dirty(old_ip);
1253
1254 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1255 mark_inode_dirty(new_dir);
1256
1257 /* Build list of inodes modified by this transaction */
1258 ipcount = 0;
1259 iplist[ipcount++] = old_ip;
1260 if (new_ip)
1261 iplist[ipcount++] = new_ip;
1262 iplist[ipcount++] = old_dir;
1263
1264 if (old_dir != new_dir) {
1265 iplist[ipcount++] = new_dir;
1266 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1267 mark_inode_dirty(old_dir);
1268 }
1269
1270 /*
1271 * Incomplete truncate of file data can
1272 * result in timing problems unless we synchronously commit the
1273 * transaction.
1274 */
1275 if (new_size)
1276 commit_flag = COMMIT_SYNC;
1277 else
1278 commit_flag = 0;
1279
1280 rc = txCommit(tid, ipcount, iplist, commit_flag);
1281
1282 out4:
1283 txEnd(tid);
1284
1285 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1286 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1287 if (old_dir != new_dir)
1288 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1289 if (new_ip)
1290 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1291
1292 while (new_size && (rc == 0)) {
1293 tid = txBegin(new_ip->i_sb, 0);
1294 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1295 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1296 if (new_size < 0) {
1297 txAbort(tid, 1);
1298 rc = new_size;
1299 } else
1300 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1301 txEnd(tid);
1302 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1303 }
1304 if (new_ip && (new_ip->i_nlink == 0))
1305 set_cflag(COMMIT_Nolink, new_ip);
1306 out3:
1307 free_UCSname(&new_dname);
1308 out2:
1309 free_UCSname(&old_dname);
1310 out1:
1311 if (new_ip && !S_ISDIR(new_ip->i_mode))
1312 IWRITE_UNLOCK(new_ip);
1313 /*
1314 * Truncating the directory index table is not guaranteed. It
1315 * may need to be done iteratively
1316 */
1317 if (test_cflag(COMMIT_Stale, old_dir)) {
1318 if (old_dir->i_size > 1)
1319 jfs_truncate_nolock(old_dir, 0);
1320
1321 clear_cflag(COMMIT_Stale, old_dir);
1322 }
1323
1324 jfs_info("jfs_rename: returning %d", rc);
1325 return rc;
1326 }
1327
1328
1329 /*
1330 * NAME: jfs_mknod
1331 *
1332 * FUNCTION: Create a special file (device)
1333 */
1334 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1335 int mode, dev_t rdev)
1336 {
1337 struct jfs_inode_info *jfs_ip;
1338 struct btstack btstack;
1339 struct component_name dname;
1340 ino_t ino;
1341 struct inode *ip;
1342 struct inode *iplist[2];
1343 int rc;
1344 tid_t tid;
1345 struct tblock *tblk;
1346
1347 if (!new_valid_dev(rdev))
1348 return -EINVAL;
1349
1350 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1351
1352 if ((rc = get_UCSname(&dname, dentry)))
1353 goto out;
1354
1355 ip = ialloc(dir, mode);
1356 if (ip == NULL) {
1357 rc = -ENOSPC;
1358 goto out1;
1359 }
1360 jfs_ip = JFS_IP(ip);
1361
1362 tid = txBegin(dir->i_sb, 0);
1363
1364 mutex_lock(&JFS_IP(dir)->commit_mutex);
1365 mutex_lock(&JFS_IP(ip)->commit_mutex);
1366
1367 rc = jfs_init_acl(tid, ip, dir);
1368 if (rc)
1369 goto out3;
1370
1371 rc = jfs_init_security(tid, ip, dir);
1372 if (rc) {
1373 txAbort(tid, 0);
1374 goto out3;
1375 }
1376
1377 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1378 txAbort(tid, 0);
1379 goto out3;
1380 }
1381
1382 tblk = tid_to_tblock(tid);
1383 tblk->xflag |= COMMIT_CREATE;
1384 tblk->ino = ip->i_ino;
1385 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1386
1387 ino = ip->i_ino;
1388 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1389 txAbort(tid, 0);
1390 goto out3;
1391 }
1392
1393 ip->i_op = &jfs_file_inode_operations;
1394 jfs_ip->dev = new_encode_dev(rdev);
1395 init_special_inode(ip, ip->i_mode, rdev);
1396
1397 insert_inode_hash(ip);
1398 mark_inode_dirty(ip);
1399
1400 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1401
1402 mark_inode_dirty(dir);
1403
1404 iplist[0] = dir;
1405 iplist[1] = ip;
1406 rc = txCommit(tid, 2, iplist, 0);
1407
1408 out3:
1409 txEnd(tid);
1410 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1411 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1412 if (rc) {
1413 free_ea_wmap(ip);
1414 ip->i_nlink = 0;
1415 iput(ip);
1416 } else
1417 d_instantiate(dentry, ip);
1418
1419 out1:
1420 free_UCSname(&dname);
1421
1422 out:
1423 jfs_info("jfs_mknod: returning %d", rc);
1424 return rc;
1425 }
1426
1427 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1428 {
1429 struct btstack btstack;
1430 ino_t inum;
1431 struct inode *ip;
1432 struct component_name key;
1433 const char *name = dentry->d_name.name;
1434 int len = dentry->d_name.len;
1435 int rc;
1436
1437 jfs_info("jfs_lookup: name = %s", name);
1438
1439 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1440 dentry->d_op = &jfs_ci_dentry_operations;
1441
1442 if ((name[0] == '.') && (len == 1))
1443 inum = dip->i_ino;
1444 else if (strcmp(name, "..") == 0)
1445 inum = PARENT(dip);
1446 else {
1447 if ((rc = get_UCSname(&key, dentry)))
1448 return ERR_PTR(rc);
1449 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1450 free_UCSname(&key);
1451 if (rc == -ENOENT) {
1452 d_add(dentry, NULL);
1453 return ERR_PTR(0);
1454 } else if (rc) {
1455 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1456 return ERR_PTR(rc);
1457 }
1458 }
1459
1460 ip = iget(dip->i_sb, inum);
1461 if (ip == NULL || is_bad_inode(ip)) {
1462 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1463 if (ip)
1464 iput(ip);
1465 return ERR_PTR(-EACCES);
1466 }
1467
1468 dentry = d_splice_alias(ip, dentry);
1469
1470 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1471 dentry->d_op = &jfs_ci_dentry_operations;
1472
1473 return dentry;
1474 }
1475
1476 struct dentry *jfs_get_parent(struct dentry *dentry)
1477 {
1478 struct super_block *sb = dentry->d_inode->i_sb;
1479 struct dentry *parent = ERR_PTR(-ENOENT);
1480 struct inode *inode;
1481 unsigned long parent_ino;
1482
1483 parent_ino =
1484 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1485 inode = iget(sb, parent_ino);
1486 if (inode) {
1487 if (is_bad_inode(inode)) {
1488 iput(inode);
1489 parent = ERR_PTR(-EACCES);
1490 } else {
1491 parent = d_alloc_anon(inode);
1492 if (!parent) {
1493 parent = ERR_PTR(-ENOMEM);
1494 iput(inode);
1495 }
1496 }
1497 }
1498
1499 return parent;
1500 }
1501
1502 struct inode_operations jfs_dir_inode_operations = {
1503 .create = jfs_create,
1504 .lookup = jfs_lookup,
1505 .link = jfs_link,
1506 .unlink = jfs_unlink,
1507 .symlink = jfs_symlink,
1508 .mkdir = jfs_mkdir,
1509 .rmdir = jfs_rmdir,
1510 .mknod = jfs_mknod,
1511 .rename = jfs_rename,
1512 .setxattr = jfs_setxattr,
1513 .getxattr = jfs_getxattr,
1514 .listxattr = jfs_listxattr,
1515 .removexattr = jfs_removexattr,
1516 #ifdef CONFIG_JFS_POSIX_ACL
1517 .setattr = jfs_setattr,
1518 .permission = jfs_permission,
1519 #endif
1520 };
1521
1522 const struct file_operations jfs_dir_operations = {
1523 .read = generic_read_dir,
1524 .readdir = jfs_readdir,
1525 .fsync = jfs_fsync,
1526 .ioctl = jfs_ioctl,
1527 };
1528
1529 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1530 {
1531 unsigned long hash;
1532 int i;
1533
1534 hash = init_name_hash();
1535 for (i=0; i < this->len; i++)
1536 hash = partial_name_hash(tolower(this->name[i]), hash);
1537 this->hash = end_name_hash(hash);
1538
1539 return 0;
1540 }
1541
1542 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1543 {
1544 int i, result = 1;
1545
1546 if (a->len != b->len)
1547 goto out;
1548 for (i=0; i < a->len; i++) {
1549 if (tolower(a->name[i]) != tolower(b->name[i]))
1550 goto out;
1551 }
1552 result = 0;
1553
1554 /*
1555 * We want creates to preserve case. A negative dentry, a, that
1556 * has a different case than b may cause a new entry to be created
1557 * with the wrong case. Since we can't tell if a comes from a negative
1558 * dentry, we blindly replace it with b. This should be harmless if
1559 * a is not a negative dentry.
1560 */
1561 memcpy((unsigned char *)a->name, b->name, a->len);
1562 out:
1563 return result;
1564 }
1565
1566 struct dentry_operations jfs_ci_dentry_operations =
1567 {
1568 .d_hash = jfs_ci_hash,
1569 .d_compare = jfs_ci_compare,
1570 };
Linux with added FPC-III support