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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[pv_ops_mirror.git] / fs / jfs / namei.c
blob4e0a8493cef69c394bcab1478f0872e7268b0425
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 <linux/exportfs.h>
24 #include "jfs_incore.h"
25 #include "jfs_superblock.h"
26 #include "jfs_inode.h"
27 #include "jfs_dinode.h"
28 #include "jfs_dmap.h"
29 #include "jfs_unicode.h"
30 #include "jfs_metapage.h"
31 #include "jfs_xattr.h"
32 #include "jfs_acl.h"
33 #include "jfs_debug.h"
34
35 /*
36 * forward references
37 */
38 struct dentry_operations jfs_ci_dentry_operations;
39
40 static s64 commitZeroLink(tid_t, struct inode *);
41
42 /*
43 * NAME: free_ea_wmap(inode)
44 *
45 * FUNCTION: free uncommitted extended attributes from working map
46 *
47 */
48 static inline void free_ea_wmap(struct inode *inode)
49 {
50 dxd_t *ea = &JFS_IP(inode)->ea;
51
52 if (ea->flag & DXD_EXTENT) {
53 /* free EA pages from cache */
54 invalidate_dxd_metapages(inode, *ea);
55 dbFree(inode, addressDXD(ea), lengthDXD(ea));
56 }
57 ea->flag = 0;
58 }
59
60 /*
61 * NAME: jfs_create(dip, dentry, mode)
62 *
63 * FUNCTION: create a regular file in the parent directory <dip>
64 * with name = <from dentry> and mode = <mode>
65 *
66 * PARAMETER: dip - parent directory vnode
67 * dentry - dentry of new file
68 * mode - create mode (rwxrwxrwx).
69 * nd- nd struct
70 *
71 * RETURN: Errors from subroutines
72 *
73 */
74 static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
75 struct nameidata *nd)
76 {
77 int rc = 0;
78 tid_t tid; /* transaction id */
79 struct inode *ip = NULL; /* child directory inode */
80 ino_t ino;
81 struct component_name dname; /* child directory name */
82 struct btstack btstack;
83 struct inode *iplist[2];
84 struct tblock *tblk;
85
86 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
87
88 /*
89 * search parent directory for entry/freespace
90 * (dtSearch() returns parent directory page pinned)
91 */
92 if ((rc = get_UCSname(&dname, dentry)))
93 goto out1;
94
95 /*
96 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
97 * block there while holding dtree page, so we allocate the inode &
98 * begin the transaction before we search the directory.
99 */
100 ip = ialloc(dip, mode);
101 if (IS_ERR(ip)) {
102 rc = PTR_ERR(ip);
103 goto out2;
104 }
105
106 tid = txBegin(dip->i_sb, 0);
107
108 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
109 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
110
111 rc = jfs_init_acl(tid, ip, dip);
112 if (rc)
113 goto out3;
114
115 rc = jfs_init_security(tid, ip, dip);
116 if (rc) {
117 txAbort(tid, 0);
118 goto out3;
119 }
120
121 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
122 jfs_err("jfs_create: dtSearch returned %d", rc);
123 txAbort(tid, 0);
124 goto out3;
125 }
126
127 tblk = tid_to_tblock(tid);
128 tblk->xflag |= COMMIT_CREATE;
129 tblk->ino = ip->i_ino;
130 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
131
132 iplist[0] = dip;
133 iplist[1] = ip;
134
135 /*
136 * initialize the child XAD tree root in-line in inode
137 */
138 xtInitRoot(tid, ip);
139
140 /*
141 * create entry in parent directory for child directory
142 * (dtInsert() releases parent directory page)
143 */
144 ino = ip->i_ino;
145 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
146 if (rc == -EIO) {
147 jfs_err("jfs_create: dtInsert returned -EIO");
148 txAbort(tid, 1); /* Marks Filesystem dirty */
149 } else
150 txAbort(tid, 0); /* Filesystem full */
151 goto out3;
152 }
153
154 ip->i_op = &jfs_file_inode_operations;
155 ip->i_fop = &jfs_file_operations;
156 ip->i_mapping->a_ops = &jfs_aops;
157
158 insert_inode_hash(ip);
159 mark_inode_dirty(ip);
160
161 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
162
163 mark_inode_dirty(dip);
164
165 rc = txCommit(tid, 2, &iplist[0], 0);
166
167 out3:
168 txEnd(tid);
169 mutex_unlock(&JFS_IP(ip)->commit_mutex);
170 mutex_unlock(&JFS_IP(dip)->commit_mutex);
171 if (rc) {
172 free_ea_wmap(ip);
173 ip->i_nlink = 0;
174 iput(ip);
175 } else
176 d_instantiate(dentry, ip);
177
178 out2:
179 free_UCSname(&dname);
180
181 out1:
182
183 jfs_info("jfs_create: rc:%d", rc);
184 return rc;
185 }
186
187
188 /*
189 * NAME: jfs_mkdir(dip, dentry, mode)
190 *
191 * FUNCTION: create a child directory in the parent directory <dip>
192 * with name = <from dentry> and mode = <mode>
193 *
194 * PARAMETER: dip - parent directory vnode
195 * dentry - dentry of child directory
196 * mode - create mode (rwxrwxrwx).
197 *
198 * RETURN: Errors from subroutines
199 *
200 * note:
201 * EACCESS: user needs search+write permission on the parent directory
202 */
203 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
204 {
205 int rc = 0;
206 tid_t tid; /* transaction id */
207 struct inode *ip = NULL; /* child directory inode */
208 ino_t ino;
209 struct component_name dname; /* child directory name */
210 struct btstack btstack;
211 struct inode *iplist[2];
212 struct tblock *tblk;
213
214 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
215
216 /* link count overflow on parent directory ? */
217 if (dip->i_nlink == JFS_LINK_MAX) {
218 rc = -EMLINK;
219 goto out1;
220 }
221
222 /*
223 * search parent directory for entry/freespace
224 * (dtSearch() returns parent directory page pinned)
225 */
226 if ((rc = get_UCSname(&dname, dentry)))
227 goto out1;
228
229 /*
230 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
231 * block there while holding dtree page, so we allocate the inode &
232 * begin the transaction before we search the directory.
233 */
234 ip = ialloc(dip, S_IFDIR | mode);
235 if (IS_ERR(ip)) {
236 rc = PTR_ERR(ip);
237 goto out2;
238 }
239
240 tid = txBegin(dip->i_sb, 0);
241
242 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
243 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
244
245 rc = jfs_init_acl(tid, ip, dip);
246 if (rc)
247 goto out3;
248
249 rc = jfs_init_security(tid, ip, dip);
250 if (rc) {
251 txAbort(tid, 0);
252 goto out3;
253 }
254
255 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
256 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
257 txAbort(tid, 0);
258 goto out3;
259 }
260
261 tblk = tid_to_tblock(tid);
262 tblk->xflag |= COMMIT_CREATE;
263 tblk->ino = ip->i_ino;
264 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
265
266 iplist[0] = dip;
267 iplist[1] = ip;
268
269 /*
270 * initialize the child directory in-line in inode
271 */
272 dtInitRoot(tid, ip, dip->i_ino);
273
274 /*
275 * create entry in parent directory for child directory
276 * (dtInsert() releases parent directory page)
277 */
278 ino = ip->i_ino;
279 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
280 if (rc == -EIO) {
281 jfs_err("jfs_mkdir: dtInsert returned -EIO");
282 txAbort(tid, 1); /* Marks Filesystem dirty */
283 } else
284 txAbort(tid, 0); /* Filesystem full */
285 goto out3;
286 }
287
288 ip->i_nlink = 2; /* for '.' */
289 ip->i_op = &jfs_dir_inode_operations;
290 ip->i_fop = &jfs_dir_operations;
291
292 insert_inode_hash(ip);
293 mark_inode_dirty(ip);
294
295 /* update parent directory inode */
296 inc_nlink(dip); /* for '..' from child directory */
297 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
298 mark_inode_dirty(dip);
299
300 rc = txCommit(tid, 2, &iplist[0], 0);
301
302 out3:
303 txEnd(tid);
304 mutex_unlock(&JFS_IP(ip)->commit_mutex);
305 mutex_unlock(&JFS_IP(dip)->commit_mutex);
306 if (rc) {
307 free_ea_wmap(ip);
308 ip->i_nlink = 0;
309 iput(ip);
310 } else
311 d_instantiate(dentry, ip);
312
313 out2:
314 free_UCSname(&dname);
315
316
317 out1:
318
319 jfs_info("jfs_mkdir: rc:%d", rc);
320 return rc;
321 }
322
323 /*
324 * NAME: jfs_rmdir(dip, dentry)
325 *
326 * FUNCTION: remove a link to child directory
327 *
328 * PARAMETER: dip - parent inode
329 * dentry - child directory dentry
330 *
331 * RETURN: -EINVAL - if name is . or ..
332 * -EINVAL - if . or .. exist but are invalid.
333 * errors from subroutines
334 *
335 * note:
336 * if other threads have the directory open when the last link
337 * is removed, the "." and ".." entries, if present, are removed before
338 * rmdir() returns and no new entries may be created in the directory,
339 * but the directory is not removed until the last reference to
340 * the directory is released (cf.unlink() of regular file).
341 */
342 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
343 {
344 int rc;
345 tid_t tid; /* transaction id */
346 struct inode *ip = dentry->d_inode;
347 ino_t ino;
348 struct component_name dname;
349 struct inode *iplist[2];
350 struct tblock *tblk;
351
352 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
353
354 /* Init inode for quota operations. */
355 DQUOT_INIT(ip);
356
357 /* directory must be empty to be removed */
358 if (!dtEmpty(ip)) {
359 rc = -ENOTEMPTY;
360 goto out;
361 }
362
363 if ((rc = get_UCSname(&dname, dentry))) {
364 goto out;
365 }
366
367 tid = txBegin(dip->i_sb, 0);
368
369 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
370 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
371
372 iplist[0] = dip;
373 iplist[1] = ip;
374
375 tblk = tid_to_tblock(tid);
376 tblk->xflag |= COMMIT_DELETE;
377 tblk->u.ip = ip;
378
379 /*
380 * delete the entry of target directory from parent directory
381 */
382 ino = ip->i_ino;
383 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
384 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
385 if (rc == -EIO)
386 txAbort(tid, 1);
387 txEnd(tid);
388 mutex_unlock(&JFS_IP(ip)->commit_mutex);
389 mutex_unlock(&JFS_IP(dip)->commit_mutex);
390
391 goto out2;
392 }
393
394 /* update parent directory's link count corresponding
395 * to ".." entry of the target directory deleted
396 */
397 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
398 inode_dec_link_count(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 clear_nlink(ip);
419 mark_inode_dirty(ip);
420
421 rc = txCommit(tid, 2, &iplist[0], 0);
422
423 txEnd(tid);
424
425 mutex_unlock(&JFS_IP(ip)->commit_mutex);
426 mutex_unlock(&JFS_IP(dip)->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, RDWRLOCK_NORMAL);
488
489 tid = txBegin(dip->i_sb, 0);
490
491 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
492 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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(ip)->commit_mutex);
507 mutex_unlock(&JFS_IP(dip)->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 inode_dec_link_count(ip);
519
520 /*
521 * commit zero link count object
522 */
523 if (ip->i_nlink == 0) {
524 assert(!test_cflag(COMMIT_Nolink, ip));
525 /* free block resources */
526 if ((new_size = commitZeroLink(tid, ip)) < 0) {
527 txAbort(tid, 1); /* Marks FS Dirty */
528 txEnd(tid);
529 mutex_unlock(&JFS_IP(ip)->commit_mutex);
530 mutex_unlock(&JFS_IP(dip)->commit_mutex);
531 IWRITE_UNLOCK(ip);
532 rc = new_size;
533 goto out1;
534 }
535 tblk = tid_to_tblock(tid);
536 tblk->xflag |= COMMIT_DELETE;
537 tblk->u.ip = ip;
538 }
539
540 /*
541 * Incomplete truncate of file data can
542 * result in timing problems unless we synchronously commit the
543 * transaction.
544 */
545 if (new_size)
546 commit_flag = COMMIT_SYNC;
547 else
548 commit_flag = 0;
549
550 /*
551 * If xtTruncate was incomplete, commit synchronously to avoid
552 * timing complications
553 */
554 rc = txCommit(tid, 2, &iplist[0], commit_flag);
555
556 txEnd(tid);
557
558 mutex_unlock(&JFS_IP(ip)->commit_mutex);
559 mutex_unlock(&JFS_IP(dip)->commit_mutex);
560
561 while (new_size && (rc == 0)) {
562 tid = txBegin(dip->i_sb, 0);
563 mutex_lock(&JFS_IP(ip)->commit_mutex);
564 new_size = xtTruncate_pmap(tid, ip, new_size);
565 if (new_size < 0) {
566 txAbort(tid, 1); /* Marks FS Dirty */
567 rc = new_size;
568 } else
569 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
570 txEnd(tid);
571 mutex_unlock(&JFS_IP(ip)->commit_mutex);
572 }
573
574 if (ip->i_nlink == 0)
575 set_cflag(COMMIT_Nolink, ip);
576
577 IWRITE_UNLOCK(ip);
578
579 /*
580 * Truncating the directory index table is not guaranteed. It
581 * may need to be done iteratively
582 */
583 if (test_cflag(COMMIT_Stale, dip)) {
584 if (dip->i_size > 1)
585 jfs_truncate_nolock(dip, 0);
586
587 clear_cflag(COMMIT_Stale, dip);
588 }
589
590 out1:
591 free_UCSname(&dname);
592 out:
593 jfs_info("jfs_unlink: rc:%d", rc);
594 return rc;
595 }
596
597 /*
598 * NAME: commitZeroLink()
599 *
600 * FUNCTION: for non-directory, called by jfs_remove(),
601 * truncate a regular file, directory or symbolic
602 * link to zero length. return 0 if type is not
603 * one of these.
604 *
605 * if the file is currently associated with a VM segment
606 * only permanent disk and inode map resources are freed,
607 * and neither the inode nor indirect blocks are modified
608 * so that the resources can be later freed in the work
609 * map by ctrunc1.
610 * if there is no VM segment on entry, the resources are
611 * freed in both work and permanent map.
612 * (? for temporary file - memory object is cached even
613 * after no reference:
614 * reference count > 0 - )
615 *
616 * PARAMETERS: cd - pointer to commit data structure.
617 * current inode is the one to truncate.
618 *
619 * RETURN: Errors from subroutines
620 */
621 static s64 commitZeroLink(tid_t tid, struct inode *ip)
622 {
623 int filetype;
624 struct tblock *tblk;
625
626 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
627
628 filetype = ip->i_mode & S_IFMT;
629 switch (filetype) {
630 case S_IFREG:
631 break;
632 case S_IFLNK:
633 /* fast symbolic link */
634 if (ip->i_size < IDATASIZE) {
635 ip->i_size = 0;
636 return 0;
637 }
638 break;
639 default:
640 assert(filetype != S_IFDIR);
641 return 0;
642 }
643
644 set_cflag(COMMIT_Freewmap, ip);
645
646 /* mark transaction of block map update type */
647 tblk = tid_to_tblock(tid);
648 tblk->xflag |= COMMIT_PMAP;
649
650 /*
651 * free EA
652 */
653 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
654 /* acquire maplock on EA to be freed from block map */
655 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
656
657 /*
658 * free ACL
659 */
660 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
661 /* acquire maplock on EA to be freed from block map */
662 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
663
664 /*
665 * free xtree/data (truncate to zero length):
666 * free xtree/data pages from cache if COMMIT_PWMAP,
667 * free xtree/data blocks from persistent block map, and
668 * free xtree/data blocks from working block map if COMMIT_PWMAP;
669 */
670 if (ip->i_size)
671 return xtTruncate_pmap(tid, ip, 0);
672
673 return 0;
674 }
675
676
677 /*
678 * NAME: jfs_free_zero_link()
679 *
680 * FUNCTION: for non-directory, called by iClose(),
681 * free resources of a file from cache and WORKING map
682 * for a file previously committed with zero link count
683 * while associated with a pager object,
684 *
685 * PARAMETER: ip - pointer to inode of file.
686 */
687 void jfs_free_zero_link(struct inode *ip)
688 {
689 int type;
690
691 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
692
693 /* return if not reg or symbolic link or if size is
694 * already ok.
695 */
696 type = ip->i_mode & S_IFMT;
697
698 switch (type) {
699 case S_IFREG:
700 break;
701 case S_IFLNK:
702 /* if its contained in inode nothing to do */
703 if (ip->i_size < IDATASIZE)
704 return;
705 break;
706 default:
707 return;
708 }
709
710 /*
711 * free EA
712 */
713 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
714 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
715 int xlen = lengthDXD(&JFS_IP(ip)->ea);
716 struct maplock maplock; /* maplock for COMMIT_WMAP */
717 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
718
719 /* free EA pages from cache */
720 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
721
722 /* free EA extent from working block map */
723 maplock.index = 1;
724 pxdlock = (struct pxd_lock *) & maplock;
725 pxdlock->flag = mlckFREEPXD;
726 PXDaddress(&pxdlock->pxd, xaddr);
727 PXDlength(&pxdlock->pxd, xlen);
728 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
729 }
730
731 /*
732 * free ACL
733 */
734 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
735 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
736 int xlen = lengthDXD(&JFS_IP(ip)->acl);
737 struct maplock maplock; /* maplock for COMMIT_WMAP */
738 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
739
740 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
741
742 /* free ACL extent from working block map */
743 maplock.index = 1;
744 pxdlock = (struct pxd_lock *) & maplock;
745 pxdlock->flag = mlckFREEPXD;
746 PXDaddress(&pxdlock->pxd, xaddr);
747 PXDlength(&pxdlock->pxd, xlen);
748 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
749 }
750
751 /*
752 * free xtree/data (truncate to zero length):
753 * free xtree/data pages from cache, and
754 * free xtree/data blocks from working block map;
755 */
756 if (ip->i_size)
757 xtTruncate(0, ip, 0, COMMIT_WMAP);
758 }
759
760 /*
761 * NAME: jfs_link(vp, dvp, name, crp)
762 *
763 * FUNCTION: create a link to <vp> by the name = <name>
764 * in the parent directory <dvp>
765 *
766 * PARAMETER: vp - target object
767 * dvp - parent directory of new link
768 * name - name of new link to target object
769 * crp - credential
770 *
771 * RETURN: Errors from subroutines
772 *
773 * note:
774 * JFS does NOT support link() on directories (to prevent circular
775 * path in the directory hierarchy);
776 * EPERM: the target object is a directory, and either the caller
777 * does not have appropriate privileges or the implementation prohibits
778 * using link() on directories [XPG4.2].
779 *
780 * JFS does NOT support links between file systems:
781 * EXDEV: target object and new link are on different file systems and
782 * implementation does not support links between file systems [XPG4.2].
783 */
784 static int jfs_link(struct dentry *old_dentry,
785 struct inode *dir, struct dentry *dentry)
786 {
787 int rc;
788 tid_t tid;
789 struct inode *ip = old_dentry->d_inode;
790 ino_t ino;
791 struct component_name dname;
792 struct btstack btstack;
793 struct inode *iplist[2];
794
795 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
796 dentry->d_name.name);
797
798 if (ip->i_nlink == JFS_LINK_MAX)
799 return -EMLINK;
800
801 if (ip->i_nlink == 0)
802 return -ENOENT;
803
804 tid = txBegin(ip->i_sb, 0);
805
806 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
807 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
808
809 /*
810 * scan parent directory for entry/freespace
811 */
812 if ((rc = get_UCSname(&dname, dentry)))
813 goto out;
814
815 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
816 goto free_dname;
817
818 /*
819 * create entry for new link in parent directory
820 */
821 ino = ip->i_ino;
822 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
823 goto free_dname;
824
825 /* update object inode */
826 inc_nlink(ip); /* for new link */
827 ip->i_ctime = CURRENT_TIME;
828 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
829 mark_inode_dirty(dir);
830 atomic_inc(&ip->i_count);
831
832 iplist[0] = ip;
833 iplist[1] = dir;
834 rc = txCommit(tid, 2, &iplist[0], 0);
835
836 if (rc) {
837 ip->i_nlink--; /* never instantiated */
838 iput(ip);
839 } else
840 d_instantiate(dentry, ip);
841
842 free_dname:
843 free_UCSname(&dname);
844
845 out:
846 txEnd(tid);
847
848 mutex_unlock(&JFS_IP(ip)->commit_mutex);
849 mutex_unlock(&JFS_IP(dir)->commit_mutex);
850
851 jfs_info("jfs_link: rc:%d", rc);
852 return rc;
853 }
854
855 /*
856 * NAME: jfs_symlink(dip, dentry, name)
857 *
858 * FUNCTION: creates a symbolic link to <symlink> by name <name>
859 * in directory <dip>
860 *
861 * PARAMETER: dip - parent directory vnode
862 * dentry - dentry of symbolic link
863 * name - the path name of the existing object
864 * that will be the source of the link
865 *
866 * RETURN: errors from subroutines
867 *
868 * note:
869 * ENAMETOOLONG: pathname resolution of a symbolic link produced
870 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
871 */
872
873 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
874 const char *name)
875 {
876 int rc;
877 tid_t tid;
878 ino_t ino = 0;
879 struct component_name dname;
880 int ssize; /* source pathname size */
881 struct btstack btstack;
882 struct inode *ip = dentry->d_inode;
883 unchar *i_fastsymlink;
884 s64 xlen = 0;
885 int bmask = 0, xsize;
886 s64 extent = 0, xaddr;
887 struct metapage *mp;
888 struct super_block *sb;
889 struct tblock *tblk;
890
891 struct inode *iplist[2];
892
893 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
894
895 ssize = strlen(name) + 1;
896
897 /*
898 * search parent directory for entry/freespace
899 * (dtSearch() returns parent directory page pinned)
900 */
901
902 if ((rc = get_UCSname(&dname, dentry)))
903 goto out1;
904
905 /*
906 * allocate on-disk/in-memory inode for symbolic link:
907 * (iAlloc() returns new, locked inode)
908 */
909 ip = ialloc(dip, S_IFLNK | 0777);
910 if (IS_ERR(ip)) {
911 rc = PTR_ERR(ip);
912 goto out2;
913 }
914
915 tid = txBegin(dip->i_sb, 0);
916
917 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
918 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
919
920 rc = jfs_init_security(tid, ip, dip);
921 if (rc)
922 goto out3;
923
924 tblk = tid_to_tblock(tid);
925 tblk->xflag |= COMMIT_CREATE;
926 tblk->ino = ip->i_ino;
927 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
928
929 /* fix symlink access permission
930 * (dir_create() ANDs in the u.u_cmask,
931 * but symlinks really need to be 777 access)
932 */
933 ip->i_mode |= 0777;
934
935 /*
936 * write symbolic link target path name
937 */
938 xtInitRoot(tid, ip);
939
940 /*
941 * write source path name inline in on-disk inode (fast symbolic link)
942 */
943
944 if (ssize <= IDATASIZE) {
945 ip->i_op = &jfs_symlink_inode_operations;
946
947 i_fastsymlink = JFS_IP(ip)->i_inline;
948 memcpy(i_fastsymlink, name, ssize);
949 ip->i_size = ssize - 1;
950
951 /*
952 * if symlink is > 128 bytes, we don't have the space to
953 * store inline extended attributes
954 */
955 if (ssize > sizeof (JFS_IP(ip)->i_inline))
956 JFS_IP(ip)->mode2 &= ~INLINEEA;
957
958 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
959 ssize, name);
960 }
961 /*
962 * write source path name in a single extent
963 */
964 else {
965 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
966
967 ip->i_op = &page_symlink_inode_operations;
968 ip->i_mapping->a_ops = &jfs_aops;
969
970 /*
971 * even though the data of symlink object (source
972 * path name) is treated as non-journaled user data,
973 * it is read/written thru buffer cache for performance.
974 */
975 sb = ip->i_sb;
976 bmask = JFS_SBI(sb)->bsize - 1;
977 xsize = (ssize + bmask) & ~bmask;
978 xaddr = 0;
979 xlen = xsize >> JFS_SBI(sb)->l2bsize;
980 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
981 txAbort(tid, 0);
982 goto out3;
983 }
984 extent = xaddr;
985 ip->i_size = ssize - 1;
986 while (ssize) {
987 /* This is kind of silly since PATH_MAX == 4K */
988 int copy_size = min(ssize, PSIZE);
989
990 mp = get_metapage(ip, xaddr, PSIZE, 1);
991
992 if (mp == NULL) {
993 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
994 rc = -EIO;
995 txAbort(tid, 0);
996 goto out3;
997 }
998 memcpy(mp->data, name, copy_size);
999 flush_metapage(mp);
1000 ssize -= copy_size;
1001 name += copy_size;
1002 xaddr += JFS_SBI(sb)->nbperpage;
1003 }
1004 }
1005
1006 /*
1007 * create entry for symbolic link in parent directory
1008 */
1009 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1010 if (rc == 0) {
1011 ino = ip->i_ino;
1012 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1013 }
1014 if (rc) {
1015 if (xlen)
1016 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1017 txAbort(tid, 0);
1018 /* discard new inode */
1019 goto out3;
1020 }
1021
1022 insert_inode_hash(ip);
1023 mark_inode_dirty(ip);
1024
1025 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1026 mark_inode_dirty(dip);
1027 /*
1028 * commit update of parent directory and link object
1029 */
1030
1031 iplist[0] = dip;
1032 iplist[1] = ip;
1033 rc = txCommit(tid, 2, &iplist[0], 0);
1034
1035 out3:
1036 txEnd(tid);
1037 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1038 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1039 if (rc) {
1040 free_ea_wmap(ip);
1041 ip->i_nlink = 0;
1042 iput(ip);
1043 } else
1044 d_instantiate(dentry, ip);
1045
1046 out2:
1047 free_UCSname(&dname);
1048
1049 out1:
1050 jfs_info("jfs_symlink: rc:%d", rc);
1051 return rc;
1052 }
1053
1054
1055 /*
1056 * NAME: jfs_rename
1057 *
1058 * FUNCTION: rename a file or directory
1059 */
1060 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1061 struct inode *new_dir, struct dentry *new_dentry)
1062 {
1063 struct btstack btstack;
1064 ino_t ino;
1065 struct component_name new_dname;
1066 struct inode *new_ip;
1067 struct component_name old_dname;
1068 struct inode *old_ip;
1069 int rc;
1070 tid_t tid;
1071 struct tlock *tlck;
1072 struct dt_lock *dtlck;
1073 struct lv *lv;
1074 int ipcount;
1075 struct inode *iplist[4];
1076 struct tblock *tblk;
1077 s64 new_size = 0;
1078 int commit_flag;
1079
1080
1081 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1082 new_dentry->d_name.name);
1083
1084 old_ip = old_dentry->d_inode;
1085 new_ip = new_dentry->d_inode;
1086
1087 if ((rc = get_UCSname(&old_dname, old_dentry)))
1088 goto out1;
1089
1090 if ((rc = get_UCSname(&new_dname, new_dentry)))
1091 goto out2;
1092
1093 /*
1094 * Make sure source inode number is what we think it is
1095 */
1096 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1097 if (rc || (ino != old_ip->i_ino)) {
1098 rc = -ENOENT;
1099 goto out3;
1100 }
1101
1102 /*
1103 * Make sure dest inode number (if any) is what we think it is
1104 */
1105 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1106 if (rc == 0) {
1107 if ((new_ip == 0) || (ino != new_ip->i_ino)) {
1108 rc = -ESTALE;
1109 goto out3;
1110 }
1111 } else if (rc != -ENOENT)
1112 goto out3;
1113 else if (new_ip) {
1114 /* no entry exists, but one was expected */
1115 rc = -ESTALE;
1116 goto out3;
1117 }
1118
1119 if (S_ISDIR(old_ip->i_mode)) {
1120 if (new_ip) {
1121 if (!dtEmpty(new_ip)) {
1122 rc = -ENOTEMPTY;
1123 goto out3;
1124 }
1125 } else if ((new_dir != old_dir) &&
1126 (new_dir->i_nlink == JFS_LINK_MAX)) {
1127 rc = -EMLINK;
1128 goto out3;
1129 }
1130 } else if (new_ip) {
1131 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1132 /* Init inode for quota operations. */
1133 DQUOT_INIT(new_ip);
1134 }
1135
1136 /*
1137 * The real work starts here
1138 */
1139 tid = txBegin(new_dir->i_sb, 0);
1140
1141 /*
1142 * How do we know the locking is safe from deadlocks?
1143 * The vfs does the hard part for us. Any time we are taking nested
1144 * commit_mutexes, the vfs already has i_mutex held on the parent.
1145 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1146 */
1147 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1148 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1149 if (old_dir != new_dir)
1150 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1151 COMMIT_MUTEX_SECOND_PARENT);
1152
1153 if (new_ip) {
1154 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1155 COMMIT_MUTEX_VICTIM);
1156 /*
1157 * Change existing directory entry to new inode number
1158 */
1159 ino = new_ip->i_ino;
1160 rc = dtModify(tid, new_dir, &new_dname, &ino,
1161 old_ip->i_ino, JFS_RENAME);
1162 if (rc)
1163 goto out4;
1164 drop_nlink(new_ip);
1165 if (S_ISDIR(new_ip->i_mode)) {
1166 drop_nlink(new_ip);
1167 if (new_ip->i_nlink) {
1168 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1169 if (old_dir != new_dir)
1170 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1171 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1172 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1173 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1174 IWRITE_UNLOCK(new_ip);
1175 jfs_error(new_ip->i_sb,
1176 "jfs_rename: new_ip->i_nlink != 0");
1177 return -EIO;
1178 }
1179 tblk = tid_to_tblock(tid);
1180 tblk->xflag |= COMMIT_DELETE;
1181 tblk->u.ip = new_ip;
1182 } else if (new_ip->i_nlink == 0) {
1183 assert(!test_cflag(COMMIT_Nolink, new_ip));
1184 /* free block resources */
1185 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1186 txAbort(tid, 1); /* Marks FS Dirty */
1187 rc = new_size;
1188 goto out4;
1189 }
1190 tblk = tid_to_tblock(tid);
1191 tblk->xflag |= COMMIT_DELETE;
1192 tblk->u.ip = new_ip;
1193 } else {
1194 new_ip->i_ctime = CURRENT_TIME;
1195 mark_inode_dirty(new_ip);
1196 }
1197 } else {
1198 /*
1199 * Add new directory entry
1200 */
1201 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1202 JFS_CREATE);
1203 if (rc) {
1204 jfs_err("jfs_rename didn't expect dtSearch to fail "
1205 "w/rc = %d", rc);
1206 goto out4;
1207 }
1208
1209 ino = old_ip->i_ino;
1210 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1211 if (rc) {
1212 if (rc == -EIO)
1213 jfs_err("jfs_rename: dtInsert returned -EIO");
1214 goto out4;
1215 }
1216 if (S_ISDIR(old_ip->i_mode))
1217 inc_nlink(new_dir);
1218 }
1219 /*
1220 * Remove old directory entry
1221 */
1222
1223 ino = old_ip->i_ino;
1224 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1225 if (rc) {
1226 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1227 rc);
1228 txAbort(tid, 1); /* Marks Filesystem dirty */
1229 goto out4;
1230 }
1231 if (S_ISDIR(old_ip->i_mode)) {
1232 drop_nlink(old_dir);
1233 if (old_dir != new_dir) {
1234 /*
1235 * Change inode number of parent for moved directory
1236 */
1237
1238 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1239 cpu_to_le32(new_dir->i_ino);
1240
1241 /* Linelock header of dtree */
1242 tlck = txLock(tid, old_ip,
1243 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1244 tlckDTREE | tlckBTROOT | tlckRELINK);
1245 dtlck = (struct dt_lock *) & tlck->lock;
1246 ASSERT(dtlck->index == 0);
1247 lv = & dtlck->lv[0];
1248 lv->offset = 0;
1249 lv->length = 1;
1250 dtlck->index++;
1251 }
1252 }
1253
1254 /*
1255 * Update ctime on changed/moved inodes & mark dirty
1256 */
1257 old_ip->i_ctime = CURRENT_TIME;
1258 mark_inode_dirty(old_ip);
1259
1260 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1261 mark_inode_dirty(new_dir);
1262
1263 /* Build list of inodes modified by this transaction */
1264 ipcount = 0;
1265 iplist[ipcount++] = old_ip;
1266 if (new_ip)
1267 iplist[ipcount++] = new_ip;
1268 iplist[ipcount++] = old_dir;
1269
1270 if (old_dir != new_dir) {
1271 iplist[ipcount++] = new_dir;
1272 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1273 mark_inode_dirty(old_dir);
1274 }
1275
1276 /*
1277 * Incomplete truncate of file data can
1278 * result in timing problems unless we synchronously commit the
1279 * transaction.
1280 */
1281 if (new_size)
1282 commit_flag = COMMIT_SYNC;
1283 else
1284 commit_flag = 0;
1285
1286 rc = txCommit(tid, ipcount, iplist, commit_flag);
1287
1288 out4:
1289 txEnd(tid);
1290 if (new_ip)
1291 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1292 if (old_dir != new_dir)
1293 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1294 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1295 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1296
1297 while (new_size && (rc == 0)) {
1298 tid = txBegin(new_ip->i_sb, 0);
1299 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1300 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1301 if (new_size < 0) {
1302 txAbort(tid, 1);
1303 rc = new_size;
1304 } else
1305 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1306 txEnd(tid);
1307 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1308 }
1309 if (new_ip && (new_ip->i_nlink == 0))
1310 set_cflag(COMMIT_Nolink, new_ip);
1311 out3:
1312 free_UCSname(&new_dname);
1313 out2:
1314 free_UCSname(&old_dname);
1315 out1:
1316 if (new_ip && !S_ISDIR(new_ip->i_mode))
1317 IWRITE_UNLOCK(new_ip);
1318 /*
1319 * Truncating the directory index table is not guaranteed. It
1320 * may need to be done iteratively
1321 */
1322 if (test_cflag(COMMIT_Stale, old_dir)) {
1323 if (old_dir->i_size > 1)
1324 jfs_truncate_nolock(old_dir, 0);
1325
1326 clear_cflag(COMMIT_Stale, old_dir);
1327 }
1328
1329 jfs_info("jfs_rename: returning %d", rc);
1330 return rc;
1331 }
1332
1333
1334 /*
1335 * NAME: jfs_mknod
1336 *
1337 * FUNCTION: Create a special file (device)
1338 */
1339 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1340 int mode, dev_t rdev)
1341 {
1342 struct jfs_inode_info *jfs_ip;
1343 struct btstack btstack;
1344 struct component_name dname;
1345 ino_t ino;
1346 struct inode *ip;
1347 struct inode *iplist[2];
1348 int rc;
1349 tid_t tid;
1350 struct tblock *tblk;
1351
1352 if (!new_valid_dev(rdev))
1353 return -EINVAL;
1354
1355 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1356
1357 if ((rc = get_UCSname(&dname, dentry)))
1358 goto out;
1359
1360 ip = ialloc(dir, mode);
1361 if (IS_ERR(ip)) {
1362 rc = PTR_ERR(ip);
1363 goto out1;
1364 }
1365 jfs_ip = JFS_IP(ip);
1366
1367 tid = txBegin(dir->i_sb, 0);
1368
1369 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1370 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1371
1372 rc = jfs_init_acl(tid, ip, dir);
1373 if (rc)
1374 goto out3;
1375
1376 rc = jfs_init_security(tid, ip, dir);
1377 if (rc) {
1378 txAbort(tid, 0);
1379 goto out3;
1380 }
1381
1382 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1383 txAbort(tid, 0);
1384 goto out3;
1385 }
1386
1387 tblk = tid_to_tblock(tid);
1388 tblk->xflag |= COMMIT_CREATE;
1389 tblk->ino = ip->i_ino;
1390 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1391
1392 ino = ip->i_ino;
1393 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1394 txAbort(tid, 0);
1395 goto out3;
1396 }
1397
1398 ip->i_op = &jfs_file_inode_operations;
1399 jfs_ip->dev = new_encode_dev(rdev);
1400 init_special_inode(ip, ip->i_mode, rdev);
1401
1402 insert_inode_hash(ip);
1403 mark_inode_dirty(ip);
1404
1405 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1406
1407 mark_inode_dirty(dir);
1408
1409 iplist[0] = dir;
1410 iplist[1] = ip;
1411 rc = txCommit(tid, 2, iplist, 0);
1412
1413 out3:
1414 txEnd(tid);
1415 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1416 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1417 if (rc) {
1418 free_ea_wmap(ip);
1419 ip->i_nlink = 0;
1420 iput(ip);
1421 } else
1422 d_instantiate(dentry, ip);
1423
1424 out1:
1425 free_UCSname(&dname);
1426
1427 out:
1428 jfs_info("jfs_mknod: returning %d", rc);
1429 return rc;
1430 }
1431
1432 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1433 {
1434 struct btstack btstack;
1435 ino_t inum;
1436 struct inode *ip;
1437 struct component_name key;
1438 const char *name = dentry->d_name.name;
1439 int len = dentry->d_name.len;
1440 int rc;
1441
1442 jfs_info("jfs_lookup: name = %s", name);
1443
1444 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1445 dentry->d_op = &jfs_ci_dentry_operations;
1446
1447 if ((name[0] == '.') && (len == 1))
1448 inum = dip->i_ino;
1449 else if (strcmp(name, "..") == 0)
1450 inum = PARENT(dip);
1451 else {
1452 if ((rc = get_UCSname(&key, dentry)))
1453 return ERR_PTR(rc);
1454 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1455 free_UCSname(&key);
1456 if (rc == -ENOENT) {
1457 d_add(dentry, NULL);
1458 return ERR_PTR(0);
1459 } else if (rc) {
1460 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1461 return ERR_PTR(rc);
1462 }
1463 }
1464
1465 ip = iget(dip->i_sb, inum);
1466 if (ip == NULL || is_bad_inode(ip)) {
1467 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1468 if (ip)
1469 iput(ip);
1470 return ERR_PTR(-EACCES);
1471 }
1472
1473 dentry = d_splice_alias(ip, dentry);
1474
1475 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1476 dentry->d_op = &jfs_ci_dentry_operations;
1477
1478 return dentry;
1479 }
1480
1481 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1482 u64 ino, u32 generation)
1483 {
1484 struct inode *inode;
1485
1486 if (ino == 0)
1487 return ERR_PTR(-ESTALE);
1488 inode = iget(sb, ino);
1489 if (inode == NULL)
1490 return ERR_PTR(-ENOMEM);
1491
1492 if (is_bad_inode(inode) ||
1493 (generation && inode->i_generation != generation)) {
1494 iput(inode);
1495 return ERR_PTR(-ESTALE);
1496 }
1497
1498 return inode;
1499 }
1500
1501 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1502 int fh_len, int fh_type)
1503 {
1504 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1505 jfs_nfs_get_inode);
1506 }
1507
1508 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1509 int fh_len, int fh_type)
1510 {
1511 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1512 jfs_nfs_get_inode);
1513 }
1514
1515 struct dentry *jfs_get_parent(struct dentry *dentry)
1516 {
1517 struct super_block *sb = dentry->d_inode->i_sb;
1518 struct dentry *parent = ERR_PTR(-ENOENT);
1519 struct inode *inode;
1520 unsigned long parent_ino;
1521
1522 parent_ino =
1523 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1524 inode = iget(sb, parent_ino);
1525 if (inode) {
1526 if (is_bad_inode(inode)) {
1527 iput(inode);
1528 parent = ERR_PTR(-EACCES);
1529 } else {
1530 parent = d_alloc_anon(inode);
1531 if (!parent) {
1532 parent = ERR_PTR(-ENOMEM);
1533 iput(inode);
1534 }
1535 }
1536 }
1537
1538 return parent;
1539 }
1540
1541 const struct inode_operations jfs_dir_inode_operations = {
1542 .create = jfs_create,
1543 .lookup = jfs_lookup,
1544 .link = jfs_link,
1545 .unlink = jfs_unlink,
1546 .symlink = jfs_symlink,
1547 .mkdir = jfs_mkdir,
1548 .rmdir = jfs_rmdir,
1549 .mknod = jfs_mknod,
1550 .rename = jfs_rename,
1551 .setxattr = jfs_setxattr,
1552 .getxattr = jfs_getxattr,
1553 .listxattr = jfs_listxattr,
1554 .removexattr = jfs_removexattr,
1555 #ifdef CONFIG_JFS_POSIX_ACL
1556 .setattr = jfs_setattr,
1557 .permission = jfs_permission,
1558 #endif
1559 };
1560
1561 const struct file_operations jfs_dir_operations = {
1562 .read = generic_read_dir,
1563 .readdir = jfs_readdir,
1564 .fsync = jfs_fsync,
1565 .ioctl = jfs_ioctl,
1566 };
1567
1568 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1569 {
1570 unsigned long hash;
1571 int i;
1572
1573 hash = init_name_hash();
1574 for (i=0; i < this->len; i++)
1575 hash = partial_name_hash(tolower(this->name[i]), hash);
1576 this->hash = end_name_hash(hash);
1577
1578 return 0;
1579 }
1580
1581 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1582 {
1583 int i, result = 1;
1584
1585 if (a->len != b->len)
1586 goto out;
1587 for (i=0; i < a->len; i++) {
1588 if (tolower(a->name[i]) != tolower(b->name[i]))
1589 goto out;
1590 }
1591 result = 0;
1592
1593 /*
1594 * We want creates to preserve case. A negative dentry, a, that
1595 * has a different case than b may cause a new entry to be created
1596 * with the wrong case. Since we can't tell if a comes from a negative
1597 * dentry, we blindly replace it with b. This should be harmless if
1598 * a is not a negative dentry.
1599 */
1600 memcpy((unsigned char *)a->name, b->name, a->len);
1601 out:
1602 return result;
1603 }
1604
1605 struct dentry_operations jfs_ci_dentry_operations =
1606 {
1607 .d_hash = jfs_ci_hash,
1608 .d_compare = jfs_ci_compare,
1609 };
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