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fed up with those stupid warnings
[mmotm.git] / fs / jfs / namei.c
blobc79a4270f0837a42e4f52d7e3eacf56dabe9745f
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 const 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 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(ip)->commit_mutex);
169 mutex_unlock(&JFS_IP(dip)->commit_mutex);
170 if (rc) {
171 free_ea_wmap(ip);
172 ip->i_nlink = 0;
173 unlock_new_inode(ip);
174 iput(ip);
175 } else {
176 d_instantiate(dentry, ip);
177 unlock_new_inode(ip);
178 }
179
180 out2:
181 free_UCSname(&dname);
182
183 out1:
184
185 jfs_info("jfs_create: rc:%d", rc);
186 return rc;
187 }
188
189
190 /*
191 * NAME: jfs_mkdir(dip, dentry, mode)
192 *
193 * FUNCTION: create a child directory in the parent directory <dip>
194 * with name = <from dentry> and mode = <mode>
195 *
196 * PARAMETER: dip - parent directory vnode
197 * dentry - dentry of child directory
198 * mode - create mode (rwxrwxrwx).
199 *
200 * RETURN: Errors from subroutines
201 *
202 * note:
203 * EACCESS: user needs search+write permission on the parent directory
204 */
205 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
206 {
207 int rc = 0;
208 tid_t tid; /* transaction id */
209 struct inode *ip = NULL; /* child directory inode */
210 ino_t ino;
211 struct component_name dname; /* child directory name */
212 struct btstack btstack;
213 struct inode *iplist[2];
214 struct tblock *tblk;
215
216 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
217
218 /* link count overflow on parent directory ? */
219 if (dip->i_nlink == JFS_LINK_MAX) {
220 rc = -EMLINK;
221 goto out1;
222 }
223
224 /*
225 * search parent directory for entry/freespace
226 * (dtSearch() returns parent directory page pinned)
227 */
228 if ((rc = get_UCSname(&dname, dentry)))
229 goto out1;
230
231 /*
232 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
233 * block there while holding dtree page, so we allocate the inode &
234 * begin the transaction before we search the directory.
235 */
236 ip = ialloc(dip, S_IFDIR | mode);
237 if (IS_ERR(ip)) {
238 rc = PTR_ERR(ip);
239 goto out2;
240 }
241
242 tid = txBegin(dip->i_sb, 0);
243
244 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
245 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
246
247 rc = jfs_init_acl(tid, ip, dip);
248 if (rc)
249 goto out3;
250
251 rc = jfs_init_security(tid, ip, dip);
252 if (rc) {
253 txAbort(tid, 0);
254 goto out3;
255 }
256
257 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
258 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
259 txAbort(tid, 0);
260 goto out3;
261 }
262
263 tblk = tid_to_tblock(tid);
264 tblk->xflag |= COMMIT_CREATE;
265 tblk->ino = ip->i_ino;
266 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
267
268 iplist[0] = dip;
269 iplist[1] = ip;
270
271 /*
272 * initialize the child directory in-line in inode
273 */
274 dtInitRoot(tid, ip, dip->i_ino);
275
276 /*
277 * create entry in parent directory for child directory
278 * (dtInsert() releases parent directory page)
279 */
280 ino = ip->i_ino;
281 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
282 if (rc == -EIO) {
283 jfs_err("jfs_mkdir: dtInsert returned -EIO");
284 txAbort(tid, 1); /* Marks Filesystem dirty */
285 } else
286 txAbort(tid, 0); /* Filesystem full */
287 goto out3;
288 }
289
290 ip->i_nlink = 2; /* for '.' */
291 ip->i_op = &jfs_dir_inode_operations;
292 ip->i_fop = &jfs_dir_operations;
293
294 mark_inode_dirty(ip);
295
296 /* update parent directory inode */
297 inc_nlink(dip); /* for '..' from child directory */
298 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
299 mark_inode_dirty(dip);
300
301 rc = txCommit(tid, 2, &iplist[0], 0);
302
303 out3:
304 txEnd(tid);
305 mutex_unlock(&JFS_IP(ip)->commit_mutex);
306 mutex_unlock(&JFS_IP(dip)->commit_mutex);
307 if (rc) {
308 free_ea_wmap(ip);
309 ip->i_nlink = 0;
310 unlock_new_inode(ip);
311 iput(ip);
312 } else {
313 d_instantiate(dentry, ip);
314 unlock_new_inode(ip);
315 }
316
317 out2:
318 free_UCSname(&dname);
319
320
321 out1:
322
323 jfs_info("jfs_mkdir: rc:%d", rc);
324 return rc;
325 }
326
327 /*
328 * NAME: jfs_rmdir(dip, dentry)
329 *
330 * FUNCTION: remove a link to child directory
331 *
332 * PARAMETER: dip - parent inode
333 * dentry - child directory dentry
334 *
335 * RETURN: -EINVAL - if name is . or ..
336 * -EINVAL - if . or .. exist but are invalid.
337 * errors from subroutines
338 *
339 * note:
340 * if other threads have the directory open when the last link
341 * is removed, the "." and ".." entries, if present, are removed before
342 * rmdir() returns and no new entries may be created in the directory,
343 * but the directory is not removed until the last reference to
344 * the directory is released (cf.unlink() of regular file).
345 */
346 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
347 {
348 int rc;
349 tid_t tid; /* transaction id */
350 struct inode *ip = dentry->d_inode;
351 ino_t ino;
352 struct component_name dname;
353 struct inode *iplist[2];
354 struct tblock *tblk;
355
356 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
357
358 /* Init inode for quota operations. */
359 vfs_dq_init(ip);
360
361 /* directory must be empty to be removed */
362 if (!dtEmpty(ip)) {
363 rc = -ENOTEMPTY;
364 goto out;
365 }
366
367 if ((rc = get_UCSname(&dname, dentry))) {
368 goto out;
369 }
370
371 tid = txBegin(dip->i_sb, 0);
372
373 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
374 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
375
376 iplist[0] = dip;
377 iplist[1] = ip;
378
379 tblk = tid_to_tblock(tid);
380 tblk->xflag |= COMMIT_DELETE;
381 tblk->u.ip = ip;
382
383 /*
384 * delete the entry of target directory from parent directory
385 */
386 ino = ip->i_ino;
387 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
388 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
389 if (rc == -EIO)
390 txAbort(tid, 1);
391 txEnd(tid);
392 mutex_unlock(&JFS_IP(ip)->commit_mutex);
393 mutex_unlock(&JFS_IP(dip)->commit_mutex);
394
395 goto out2;
396 }
397
398 /* update parent directory's link count corresponding
399 * to ".." entry of the target directory deleted
400 */
401 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
402 inode_dec_link_count(dip);
403
404 /*
405 * OS/2 could have created EA and/or ACL
406 */
407 /* free EA from both persistent and working map */
408 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
409 /* free EA pages */
410 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
411 }
412 JFS_IP(ip)->ea.flag = 0;
413
414 /* free ACL from both persistent and working map */
415 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
416 /* free ACL pages */
417 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
418 }
419 JFS_IP(ip)->acl.flag = 0;
420
421 /* mark the target directory as deleted */
422 clear_nlink(ip);
423 mark_inode_dirty(ip);
424
425 rc = txCommit(tid, 2, &iplist[0], 0);
426
427 txEnd(tid);
428
429 mutex_unlock(&JFS_IP(ip)->commit_mutex);
430 mutex_unlock(&JFS_IP(dip)->commit_mutex);
431
432 /*
433 * Truncating the directory index table is not guaranteed. It
434 * may need to be done iteratively
435 */
436 if (test_cflag(COMMIT_Stale, dip)) {
437 if (dip->i_size > 1)
438 jfs_truncate_nolock(dip, 0);
439
440 clear_cflag(COMMIT_Stale, dip);
441 }
442
443 out2:
444 free_UCSname(&dname);
445
446 out:
447 jfs_info("jfs_rmdir: rc:%d", rc);
448 return rc;
449 }
450
451 /*
452 * NAME: jfs_unlink(dip, dentry)
453 *
454 * FUNCTION: remove a link to object <vp> named by <name>
455 * from parent directory <dvp>
456 *
457 * PARAMETER: dip - inode of parent directory
458 * dentry - dentry of object to be removed
459 *
460 * RETURN: errors from subroutines
461 *
462 * note:
463 * temporary file: if one or more processes have the file open
464 * when the last link is removed, the link will be removed before
465 * unlink() returns, but the removal of the file contents will be
466 * postponed until all references to the files are closed.
467 *
468 * JFS does NOT support unlink() on directories.
469 *
470 */
471 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
472 {
473 int rc;
474 tid_t tid; /* transaction id */
475 struct inode *ip = dentry->d_inode;
476 ino_t ino;
477 struct component_name dname; /* object name */
478 struct inode *iplist[2];
479 struct tblock *tblk;
480 s64 new_size = 0;
481 int commit_flag;
482
483 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
484
485 /* Init inode for quota operations. */
486 vfs_dq_init(ip);
487
488 if ((rc = get_UCSname(&dname, dentry)))
489 goto out;
490
491 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
492
493 tid = txBegin(dip->i_sb, 0);
494
495 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
496 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
497
498 iplist[0] = dip;
499 iplist[1] = ip;
500
501 /*
502 * delete the entry of target file from parent directory
503 */
504 ino = ip->i_ino;
505 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
506 jfs_err("jfs_unlink: dtDelete returned %d", rc);
507 if (rc == -EIO)
508 txAbort(tid, 1); /* Marks FS Dirty */
509 txEnd(tid);
510 mutex_unlock(&JFS_IP(ip)->commit_mutex);
511 mutex_unlock(&JFS_IP(dip)->commit_mutex);
512 IWRITE_UNLOCK(ip);
513 goto out1;
514 }
515
516 ASSERT(ip->i_nlink);
517
518 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
519 mark_inode_dirty(dip);
520
521 /* update target's inode */
522 inode_dec_link_count(ip);
523
524 /*
525 * commit zero link count object
526 */
527 if (ip->i_nlink == 0) {
528 assert(!test_cflag(COMMIT_Nolink, ip));
529 /* free block resources */
530 if ((new_size = commitZeroLink(tid, ip)) < 0) {
531 txAbort(tid, 1); /* Marks FS Dirty */
532 txEnd(tid);
533 mutex_unlock(&JFS_IP(ip)->commit_mutex);
534 mutex_unlock(&JFS_IP(dip)->commit_mutex);
535 IWRITE_UNLOCK(ip);
536 rc = new_size;
537 goto out1;
538 }
539 tblk = tid_to_tblock(tid);
540 tblk->xflag |= COMMIT_DELETE;
541 tblk->u.ip = ip;
542 }
543
544 /*
545 * Incomplete truncate of file data can
546 * result in timing problems unless we synchronously commit the
547 * transaction.
548 */
549 if (new_size)
550 commit_flag = COMMIT_SYNC;
551 else
552 commit_flag = 0;
553
554 /*
555 * If xtTruncate was incomplete, commit synchronously to avoid
556 * timing complications
557 */
558 rc = txCommit(tid, 2, &iplist[0], commit_flag);
559
560 txEnd(tid);
561
562 mutex_unlock(&JFS_IP(ip)->commit_mutex);
563 mutex_unlock(&JFS_IP(dip)->commit_mutex);
564
565 while (new_size && (rc == 0)) {
566 tid = txBegin(dip->i_sb, 0);
567 mutex_lock(&JFS_IP(ip)->commit_mutex);
568 new_size = xtTruncate_pmap(tid, ip, new_size);
569 if (new_size < 0) {
570 txAbort(tid, 1); /* Marks FS Dirty */
571 rc = new_size;
572 } else
573 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
574 txEnd(tid);
575 mutex_unlock(&JFS_IP(ip)->commit_mutex);
576 }
577
578 if (ip->i_nlink == 0)
579 set_cflag(COMMIT_Nolink, ip);
580
581 IWRITE_UNLOCK(ip);
582
583 /*
584 * Truncating the directory index table is not guaranteed. It
585 * may need to be done iteratively
586 */
587 if (test_cflag(COMMIT_Stale, dip)) {
588 if (dip->i_size > 1)
589 jfs_truncate_nolock(dip, 0);
590
591 clear_cflag(COMMIT_Stale, dip);
592 }
593
594 out1:
595 free_UCSname(&dname);
596 out:
597 jfs_info("jfs_unlink: rc:%d", rc);
598 return rc;
599 }
600
601 /*
602 * NAME: commitZeroLink()
603 *
604 * FUNCTION: for non-directory, called by jfs_remove(),
605 * truncate a regular file, directory or symbolic
606 * link to zero length. return 0 if type is not
607 * one of these.
608 *
609 * if the file is currently associated with a VM segment
610 * only permanent disk and inode map resources are freed,
611 * and neither the inode nor indirect blocks are modified
612 * so that the resources can be later freed in the work
613 * map by ctrunc1.
614 * if there is no VM segment on entry, the resources are
615 * freed in both work and permanent map.
616 * (? for temporary file - memory object is cached even
617 * after no reference:
618 * reference count > 0 - )
619 *
620 * PARAMETERS: cd - pointer to commit data structure.
621 * current inode is the one to truncate.
622 *
623 * RETURN: Errors from subroutines
624 */
625 static s64 commitZeroLink(tid_t tid, struct inode *ip)
626 {
627 int filetype;
628 struct tblock *tblk;
629
630 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
631
632 filetype = ip->i_mode & S_IFMT;
633 switch (filetype) {
634 case S_IFREG:
635 break;
636 case S_IFLNK:
637 /* fast symbolic link */
638 if (ip->i_size < IDATASIZE) {
639 ip->i_size = 0;
640 return 0;
641 }
642 break;
643 default:
644 assert(filetype != S_IFDIR);
645 return 0;
646 }
647
648 set_cflag(COMMIT_Freewmap, ip);
649
650 /* mark transaction of block map update type */
651 tblk = tid_to_tblock(tid);
652 tblk->xflag |= COMMIT_PMAP;
653
654 /*
655 * free EA
656 */
657 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
658 /* acquire maplock on EA to be freed from block map */
659 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
660
661 /*
662 * free ACL
663 */
664 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
665 /* acquire maplock on EA to be freed from block map */
666 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
667
668 /*
669 * free xtree/data (truncate to zero length):
670 * free xtree/data pages from cache if COMMIT_PWMAP,
671 * free xtree/data blocks from persistent block map, and
672 * free xtree/data blocks from working block map if COMMIT_PWMAP;
673 */
674 if (ip->i_size)
675 return xtTruncate_pmap(tid, ip, 0);
676
677 return 0;
678 }
679
680
681 /*
682 * NAME: jfs_free_zero_link()
683 *
684 * FUNCTION: for non-directory, called by iClose(),
685 * free resources of a file from cache and WORKING map
686 * for a file previously committed with zero link count
687 * while associated with a pager object,
688 *
689 * PARAMETER: ip - pointer to inode of file.
690 */
691 void jfs_free_zero_link(struct inode *ip)
692 {
693 int type;
694
695 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
696
697 /* return if not reg or symbolic link or if size is
698 * already ok.
699 */
700 type = ip->i_mode & S_IFMT;
701
702 switch (type) {
703 case S_IFREG:
704 break;
705 case S_IFLNK:
706 /* if its contained in inode nothing to do */
707 if (ip->i_size < IDATASIZE)
708 return;
709 break;
710 default:
711 return;
712 }
713
714 /*
715 * free EA
716 */
717 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
718 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
719 int xlen = lengthDXD(&JFS_IP(ip)->ea);
720 struct maplock maplock; /* maplock for COMMIT_WMAP */
721 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
722
723 /* free EA pages from cache */
724 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
725
726 /* free EA extent from working block map */
727 maplock.index = 1;
728 pxdlock = (struct pxd_lock *) & maplock;
729 pxdlock->flag = mlckFREEPXD;
730 PXDaddress(&pxdlock->pxd, xaddr);
731 PXDlength(&pxdlock->pxd, xlen);
732 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
733 }
734
735 /*
736 * free ACL
737 */
738 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
739 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
740 int xlen = lengthDXD(&JFS_IP(ip)->acl);
741 struct maplock maplock; /* maplock for COMMIT_WMAP */
742 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
743
744 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
745
746 /* free ACL extent from working block map */
747 maplock.index = 1;
748 pxdlock = (struct pxd_lock *) & maplock;
749 pxdlock->flag = mlckFREEPXD;
750 PXDaddress(&pxdlock->pxd, xaddr);
751 PXDlength(&pxdlock->pxd, xlen);
752 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
753 }
754
755 /*
756 * free xtree/data (truncate to zero length):
757 * free xtree/data pages from cache, and
758 * free xtree/data blocks from working block map;
759 */
760 if (ip->i_size)
761 xtTruncate(0, ip, 0, COMMIT_WMAP);
762 }
763
764 /*
765 * NAME: jfs_link(vp, dvp, name, crp)
766 *
767 * FUNCTION: create a link to <vp> by the name = <name>
768 * in the parent directory <dvp>
769 *
770 * PARAMETER: vp - target object
771 * dvp - parent directory of new link
772 * name - name of new link to target object
773 * crp - credential
774 *
775 * RETURN: Errors from subroutines
776 *
777 * note:
778 * JFS does NOT support link() on directories (to prevent circular
779 * path in the directory hierarchy);
780 * EPERM: the target object is a directory, and either the caller
781 * does not have appropriate privileges or the implementation prohibits
782 * using link() on directories [XPG4.2].
783 *
784 * JFS does NOT support links between file systems:
785 * EXDEV: target object and new link are on different file systems and
786 * implementation does not support links between file systems [XPG4.2].
787 */
788 static int jfs_link(struct dentry *old_dentry,
789 struct inode *dir, struct dentry *dentry)
790 {
791 int rc;
792 tid_t tid;
793 struct inode *ip = old_dentry->d_inode;
794 ino_t ino;
795 struct component_name dname;
796 struct btstack btstack;
797 struct inode *iplist[2];
798
799 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
800 dentry->d_name.name);
801
802 if (ip->i_nlink == JFS_LINK_MAX)
803 return -EMLINK;
804
805 if (ip->i_nlink == 0)
806 return -ENOENT;
807
808 tid = txBegin(ip->i_sb, 0);
809
810 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
811 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
812
813 /*
814 * scan parent directory for entry/freespace
815 */
816 if ((rc = get_UCSname(&dname, dentry)))
817 goto out;
818
819 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
820 goto free_dname;
821
822 /*
823 * create entry for new link in parent directory
824 */
825 ino = ip->i_ino;
826 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
827 goto free_dname;
828
829 /* update object inode */
830 inc_nlink(ip); /* for new link */
831 ip->i_ctime = CURRENT_TIME;
832 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
833 mark_inode_dirty(dir);
834 atomic_inc(&ip->i_count);
835
836 iplist[0] = ip;
837 iplist[1] = dir;
838 rc = txCommit(tid, 2, &iplist[0], 0);
839
840 if (rc) {
841 ip->i_nlink--; /* never instantiated */
842 iput(ip);
843 } else
844 d_instantiate(dentry, ip);
845
846 free_dname:
847 free_UCSname(&dname);
848
849 out:
850 txEnd(tid);
851
852 mutex_unlock(&JFS_IP(ip)->commit_mutex);
853 mutex_unlock(&JFS_IP(dir)->commit_mutex);
854
855 jfs_info("jfs_link: rc:%d", rc);
856 return rc;
857 }
858
859 /*
860 * NAME: jfs_symlink(dip, dentry, name)
861 *
862 * FUNCTION: creates a symbolic link to <symlink> by name <name>
863 * in directory <dip>
864 *
865 * PARAMETER: dip - parent directory vnode
866 * dentry - dentry of symbolic link
867 * name - the path name of the existing object
868 * that will be the source of the link
869 *
870 * RETURN: errors from subroutines
871 *
872 * note:
873 * ENAMETOOLONG: pathname resolution of a symbolic link produced
874 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
875 */
876
877 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
878 const char *name)
879 {
880 int rc;
881 tid_t tid;
882 ino_t ino = 0;
883 struct component_name dname;
884 int ssize; /* source pathname size */
885 struct btstack btstack;
886 struct inode *ip = dentry->d_inode;
887 unchar *i_fastsymlink;
888 s64 xlen = 0;
889 int bmask = 0, xsize;
890 s64 extent = 0, xaddr;
891 struct metapage *mp;
892 struct super_block *sb;
893 struct tblock *tblk;
894
895 struct inode *iplist[2];
896
897 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
898
899 ssize = strlen(name) + 1;
900
901 /*
902 * search parent directory for entry/freespace
903 * (dtSearch() returns parent directory page pinned)
904 */
905
906 if ((rc = get_UCSname(&dname, dentry)))
907 goto out1;
908
909 /*
910 * allocate on-disk/in-memory inode for symbolic link:
911 * (iAlloc() returns new, locked inode)
912 */
913 ip = ialloc(dip, S_IFLNK | 0777);
914 if (IS_ERR(ip)) {
915 rc = PTR_ERR(ip);
916 goto out2;
917 }
918
919 tid = txBegin(dip->i_sb, 0);
920
921 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
922 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
923
924 rc = jfs_init_security(tid, ip, dip);
925 if (rc)
926 goto out3;
927
928 tblk = tid_to_tblock(tid);
929 tblk->xflag |= COMMIT_CREATE;
930 tblk->ino = ip->i_ino;
931 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
932
933 /* fix symlink access permission
934 * (dir_create() ANDs in the u.u_cmask,
935 * but symlinks really need to be 777 access)
936 */
937 ip->i_mode |= 0777;
938
939 /*
940 * write symbolic link target path name
941 */
942 xtInitRoot(tid, ip);
943
944 /*
945 * write source path name inline in on-disk inode (fast symbolic link)
946 */
947
948 if (ssize <= IDATASIZE) {
949 ip->i_op = &jfs_symlink_inode_operations;
950
951 i_fastsymlink = JFS_IP(ip)->i_inline;
952 memcpy(i_fastsymlink, name, ssize);
953 ip->i_size = ssize - 1;
954
955 /*
956 * if symlink is > 128 bytes, we don't have the space to
957 * store inline extended attributes
958 */
959 if (ssize > sizeof (JFS_IP(ip)->i_inline))
960 JFS_IP(ip)->mode2 &= ~INLINEEA;
961
962 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
963 ssize, name);
964 }
965 /*
966 * write source path name in a single extent
967 */
968 else {
969 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
970
971 ip->i_op = &page_symlink_inode_operations;
972 ip->i_mapping->a_ops = &jfs_aops;
973
974 /*
975 * even though the data of symlink object (source
976 * path name) is treated as non-journaled user data,
977 * it is read/written thru buffer cache for performance.
978 */
979 sb = ip->i_sb;
980 bmask = JFS_SBI(sb)->bsize - 1;
981 xsize = (ssize + bmask) & ~bmask;
982 xaddr = 0;
983 xlen = xsize >> JFS_SBI(sb)->l2bsize;
984 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
985 txAbort(tid, 0);
986 goto out3;
987 }
988 extent = xaddr;
989 ip->i_size = ssize - 1;
990 while (ssize) {
991 /* This is kind of silly since PATH_MAX == 4K */
992 int copy_size = min(ssize, PSIZE);
993
994 mp = get_metapage(ip, xaddr, PSIZE, 1);
995
996 if (mp == NULL) {
997 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
998 rc = -EIO;
999 txAbort(tid, 0);
1000 goto out3;
1001 }
1002 memcpy(mp->data, name, copy_size);
1003 flush_metapage(mp);
1004 ssize -= copy_size;
1005 name += copy_size;
1006 xaddr += JFS_SBI(sb)->nbperpage;
1007 }
1008 }
1009
1010 /*
1011 * create entry for symbolic link in parent directory
1012 */
1013 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1014 if (rc == 0) {
1015 ino = ip->i_ino;
1016 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1017 }
1018 if (rc) {
1019 if (xlen)
1020 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1021 txAbort(tid, 0);
1022 /* discard new inode */
1023 goto out3;
1024 }
1025
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(ip)->commit_mutex);
1041 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1042 if (rc) {
1043 free_ea_wmap(ip);
1044 ip->i_nlink = 0;
1045 unlock_new_inode(ip);
1046 iput(ip);
1047 } else {
1048 d_instantiate(dentry, ip);
1049 unlock_new_inode(ip);
1050 }
1051
1052 out2:
1053 free_UCSname(&dname);
1054
1055 out1:
1056 jfs_info("jfs_symlink: rc:%d", rc);
1057 return rc;
1058 }
1059
1060
1061 /*
1062 * NAME: jfs_rename
1063 *
1064 * FUNCTION: rename a file or directory
1065 */
1066 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1067 struct inode *new_dir, struct dentry *new_dentry)
1068 {
1069 struct btstack btstack;
1070 ino_t ino;
1071 struct component_name new_dname;
1072 struct inode *new_ip;
1073 struct component_name old_dname;
1074 struct inode *old_ip;
1075 int rc;
1076 tid_t tid;
1077 struct tlock *tlck;
1078 struct dt_lock *dtlck;
1079 struct lv *lv;
1080 int ipcount;
1081 struct inode *iplist[4];
1082 struct tblock *tblk;
1083 s64 new_size = 0;
1084 int commit_flag;
1085
1086
1087 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1088 new_dentry->d_name.name);
1089
1090 old_ip = old_dentry->d_inode;
1091 new_ip = new_dentry->d_inode;
1092
1093 if ((rc = get_UCSname(&old_dname, old_dentry)))
1094 goto out1;
1095
1096 if ((rc = get_UCSname(&new_dname, new_dentry)))
1097 goto out2;
1098
1099 /*
1100 * Make sure source inode number is what we think it is
1101 */
1102 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1103 if (rc || (ino != old_ip->i_ino)) {
1104 rc = -ENOENT;
1105 goto out3;
1106 }
1107
1108 /*
1109 * Make sure dest inode number (if any) is what we think it is
1110 */
1111 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1112 if (!rc) {
1113 if ((!new_ip) || (ino != new_ip->i_ino)) {
1114 rc = -ESTALE;
1115 goto out3;
1116 }
1117 } else if (rc != -ENOENT)
1118 goto out3;
1119 else if (new_ip) {
1120 /* no entry exists, but one was expected */
1121 rc = -ESTALE;
1122 goto out3;
1123 }
1124
1125 if (S_ISDIR(old_ip->i_mode)) {
1126 if (new_ip) {
1127 if (!dtEmpty(new_ip)) {
1128 rc = -ENOTEMPTY;
1129 goto out3;
1130 }
1131 } else if ((new_dir != old_dir) &&
1132 (new_dir->i_nlink == JFS_LINK_MAX)) {
1133 rc = -EMLINK;
1134 goto out3;
1135 }
1136 } else if (new_ip) {
1137 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1138 /* Init inode for quota operations. */
1139 vfs_dq_init(new_ip);
1140 }
1141
1142 /*
1143 * The real work starts here
1144 */
1145 tid = txBegin(new_dir->i_sb, 0);
1146
1147 /*
1148 * How do we know the locking is safe from deadlocks?
1149 * The vfs does the hard part for us. Any time we are taking nested
1150 * commit_mutexes, the vfs already has i_mutex held on the parent.
1151 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1152 */
1153 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1154 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1155 if (old_dir != new_dir)
1156 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1157 COMMIT_MUTEX_SECOND_PARENT);
1158
1159 if (new_ip) {
1160 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1161 COMMIT_MUTEX_VICTIM);
1162 /*
1163 * Change existing directory entry to new inode number
1164 */
1165 ino = new_ip->i_ino;
1166 rc = dtModify(tid, new_dir, &new_dname, &ino,
1167 old_ip->i_ino, JFS_RENAME);
1168 if (rc)
1169 goto out4;
1170 drop_nlink(new_ip);
1171 if (S_ISDIR(new_ip->i_mode)) {
1172 drop_nlink(new_ip);
1173 if (new_ip->i_nlink) {
1174 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1175 if (old_dir != new_dir)
1176 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1177 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1178 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1179 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1180 IWRITE_UNLOCK(new_ip);
1181 jfs_error(new_ip->i_sb,
1182 "jfs_rename: new_ip->i_nlink != 0");
1183 return -EIO;
1184 }
1185 tblk = tid_to_tblock(tid);
1186 tblk->xflag |= COMMIT_DELETE;
1187 tblk->u.ip = new_ip;
1188 } else if (new_ip->i_nlink == 0) {
1189 assert(!test_cflag(COMMIT_Nolink, new_ip));
1190 /* free block resources */
1191 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1192 txAbort(tid, 1); /* Marks FS Dirty */
1193 rc = new_size;
1194 goto out4;
1195 }
1196 tblk = tid_to_tblock(tid);
1197 tblk->xflag |= COMMIT_DELETE;
1198 tblk->u.ip = new_ip;
1199 } else {
1200 new_ip->i_ctime = CURRENT_TIME;
1201 mark_inode_dirty(new_ip);
1202 }
1203 } else {
1204 /*
1205 * Add new directory entry
1206 */
1207 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1208 JFS_CREATE);
1209 if (rc) {
1210 jfs_err("jfs_rename didn't expect dtSearch to fail "
1211 "w/rc = %d", rc);
1212 goto out4;
1213 }
1214
1215 ino = old_ip->i_ino;
1216 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1217 if (rc) {
1218 if (rc == -EIO)
1219 jfs_err("jfs_rename: dtInsert returned -EIO");
1220 goto out4;
1221 }
1222 if (S_ISDIR(old_ip->i_mode))
1223 inc_nlink(new_dir);
1224 }
1225 /*
1226 * Remove old directory entry
1227 */
1228
1229 ino = old_ip->i_ino;
1230 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1231 if (rc) {
1232 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1233 rc);
1234 txAbort(tid, 1); /* Marks Filesystem dirty */
1235 goto out4;
1236 }
1237 if (S_ISDIR(old_ip->i_mode)) {
1238 drop_nlink(old_dir);
1239 if (old_dir != new_dir) {
1240 /*
1241 * Change inode number of parent for moved directory
1242 */
1243
1244 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1245 cpu_to_le32(new_dir->i_ino);
1246
1247 /* Linelock header of dtree */
1248 tlck = txLock(tid, old_ip,
1249 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1250 tlckDTREE | tlckBTROOT | tlckRELINK);
1251 dtlck = (struct dt_lock *) & tlck->lock;
1252 ASSERT(dtlck->index == 0);
1253 lv = & dtlck->lv[0];
1254 lv->offset = 0;
1255 lv->length = 1;
1256 dtlck->index++;
1257 }
1258 }
1259
1260 /*
1261 * Update ctime on changed/moved inodes & mark dirty
1262 */
1263 old_ip->i_ctime = CURRENT_TIME;
1264 mark_inode_dirty(old_ip);
1265
1266 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1267 mark_inode_dirty(new_dir);
1268
1269 /* Build list of inodes modified by this transaction */
1270 ipcount = 0;
1271 iplist[ipcount++] = old_ip;
1272 if (new_ip)
1273 iplist[ipcount++] = new_ip;
1274 iplist[ipcount++] = old_dir;
1275
1276 if (old_dir != new_dir) {
1277 iplist[ipcount++] = new_dir;
1278 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1279 mark_inode_dirty(old_dir);
1280 }
1281
1282 /*
1283 * Incomplete truncate of file data can
1284 * result in timing problems unless we synchronously commit the
1285 * transaction.
1286 */
1287 if (new_size)
1288 commit_flag = COMMIT_SYNC;
1289 else
1290 commit_flag = 0;
1291
1292 rc = txCommit(tid, ipcount, iplist, commit_flag);
1293
1294 out4:
1295 txEnd(tid);
1296 if (new_ip)
1297 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1298 if (old_dir != new_dir)
1299 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1300 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1301 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1302
1303 while (new_size && (rc == 0)) {
1304 tid = txBegin(new_ip->i_sb, 0);
1305 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1306 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1307 if (new_size < 0) {
1308 txAbort(tid, 1);
1309 rc = new_size;
1310 } else
1311 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1312 txEnd(tid);
1313 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1314 }
1315 if (new_ip && (new_ip->i_nlink == 0))
1316 set_cflag(COMMIT_Nolink, new_ip);
1317 out3:
1318 free_UCSname(&new_dname);
1319 out2:
1320 free_UCSname(&old_dname);
1321 out1:
1322 if (new_ip && !S_ISDIR(new_ip->i_mode))
1323 IWRITE_UNLOCK(new_ip);
1324 /*
1325 * Truncating the directory index table is not guaranteed. It
1326 * may need to be done iteratively
1327 */
1328 if (test_cflag(COMMIT_Stale, old_dir)) {
1329 if (old_dir->i_size > 1)
1330 jfs_truncate_nolock(old_dir, 0);
1331
1332 clear_cflag(COMMIT_Stale, old_dir);
1333 }
1334
1335 jfs_info("jfs_rename: returning %d", rc);
1336 return rc;
1337 }
1338
1339
1340 /*
1341 * NAME: jfs_mknod
1342 *
1343 * FUNCTION: Create a special file (device)
1344 */
1345 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1346 int mode, dev_t rdev)
1347 {
1348 struct jfs_inode_info *jfs_ip;
1349 struct btstack btstack;
1350 struct component_name dname;
1351 ino_t ino;
1352 struct inode *ip;
1353 struct inode *iplist[2];
1354 int rc;
1355 tid_t tid;
1356 struct tblock *tblk;
1357
1358 if (!new_valid_dev(rdev))
1359 return -EINVAL;
1360
1361 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1362
1363 if ((rc = get_UCSname(&dname, dentry)))
1364 goto out;
1365
1366 ip = ialloc(dir, mode);
1367 if (IS_ERR(ip)) {
1368 rc = PTR_ERR(ip);
1369 goto out1;
1370 }
1371 jfs_ip = JFS_IP(ip);
1372
1373 tid = txBegin(dir->i_sb, 0);
1374
1375 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1376 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1377
1378 rc = jfs_init_acl(tid, ip, dir);
1379 if (rc)
1380 goto out3;
1381
1382 rc = jfs_init_security(tid, ip, dir);
1383 if (rc) {
1384 txAbort(tid, 0);
1385 goto out3;
1386 }
1387
1388 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1389 txAbort(tid, 0);
1390 goto out3;
1391 }
1392
1393 tblk = tid_to_tblock(tid);
1394 tblk->xflag |= COMMIT_CREATE;
1395 tblk->ino = ip->i_ino;
1396 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1397
1398 ino = ip->i_ino;
1399 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1400 txAbort(tid, 0);
1401 goto out3;
1402 }
1403
1404 ip->i_op = &jfs_file_inode_operations;
1405 jfs_ip->dev = new_encode_dev(rdev);
1406 init_special_inode(ip, ip->i_mode, rdev);
1407
1408 mark_inode_dirty(ip);
1409
1410 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1411
1412 mark_inode_dirty(dir);
1413
1414 iplist[0] = dir;
1415 iplist[1] = ip;
1416 rc = txCommit(tid, 2, iplist, 0);
1417
1418 out3:
1419 txEnd(tid);
1420 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1421 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1422 if (rc) {
1423 free_ea_wmap(ip);
1424 ip->i_nlink = 0;
1425 unlock_new_inode(ip);
1426 iput(ip);
1427 } else {
1428 d_instantiate(dentry, ip);
1429 unlock_new_inode(ip);
1430 }
1431
1432 out1:
1433 free_UCSname(&dname);
1434
1435 out:
1436 jfs_info("jfs_mknod: returning %d", rc);
1437 return rc;
1438 }
1439
1440 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1441 {
1442 struct btstack btstack;
1443 ino_t inum;
1444 struct inode *ip;
1445 struct component_name key;
1446 const char *name = dentry->d_name.name;
1447 int len = dentry->d_name.len;
1448 int rc;
1449
1450 jfs_info("jfs_lookup: name = %s", name);
1451
1452 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1453 dentry->d_op = &jfs_ci_dentry_operations;
1454
1455 if ((name[0] == '.') && (len == 1))
1456 inum = dip->i_ino;
1457 else if (strcmp(name, "..") == 0)
1458 inum = PARENT(dip);
1459 else {
1460 if ((rc = get_UCSname(&key, dentry)))
1461 return ERR_PTR(rc);
1462 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1463 free_UCSname(&key);
1464 if (rc == -ENOENT) {
1465 d_add(dentry, NULL);
1466 return NULL;
1467 } else if (rc) {
1468 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1469 return ERR_PTR(rc);
1470 }
1471 }
1472
1473 ip = jfs_iget(dip->i_sb, inum);
1474 if (IS_ERR(ip)) {
1475 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1476 return ERR_CAST(ip);
1477 }
1478
1479 dentry = d_splice_alias(ip, dentry);
1480
1481 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1482 dentry->d_op = &jfs_ci_dentry_operations;
1483
1484 return dentry;
1485 }
1486
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
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
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
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(dentry->d_inode)->i_dtroot.header.idotdot);
1526
1527 return d_obtain_alias(jfs_iget(dentry->d_inode->i_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 .setxattr = jfs_setxattr,
1541 .getxattr = jfs_getxattr,
1542 .listxattr = jfs_listxattr,
1543 .removexattr = jfs_removexattr,
1544 #ifdef CONFIG_JFS_POSIX_ACL
1545 .setattr = jfs_setattr,
1546 .check_acl = jfs_check_acl,
1547 #endif
1548 };
1549
1550 const struct file_operations jfs_dir_operations = {
1551 .read = generic_read_dir,
1552 .readdir = jfs_readdir,
1553 .fsync = jfs_fsync,
1554 .unlocked_ioctl = jfs_ioctl,
1555 #ifdef CONFIG_COMPAT
1556 .compat_ioctl = jfs_compat_ioctl,
1557 #endif
1558 .llseek = generic_file_llseek,
1559 };
1560
1561 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1562 {
1563 unsigned long hash;
1564 int i;
1565
1566 hash = init_name_hash();
1567 for (i=0; i < this->len; i++)
1568 hash = partial_name_hash(tolower(this->name[i]), hash);
1569 this->hash = end_name_hash(hash);
1570
1571 return 0;
1572 }
1573
1574 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1575 {
1576 int i, result = 1;
1577
1578 if (a->len != b->len)
1579 goto out;
1580 for (i=0; i < a->len; i++) {
1581 if (tolower(a->name[i]) != tolower(b->name[i]))
1582 goto out;
1583 }
1584 result = 0;
1585
1586 /*
1587 * We want creates to preserve case. A negative dentry, a, that
1588 * has a different case than b may cause a new entry to be created
1589 * with the wrong case. Since we can't tell if a comes from a negative
1590 * dentry, we blindly replace it with b. This should be harmless if
1591 * a is not a negative dentry.
1592 */
1593 memcpy((unsigned char *)a->name, b->name, a->len);
1594 out:
1595 return result;
1596 }
1597
1598 const struct dentry_operations jfs_ci_dentry_operations =
1599 {
1600 .d_hash = jfs_ci_hash,
1601 .d_compare = jfs_ci_compare,
1602 };
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