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-rw-r--r--fs/jfs/namei.c1540
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diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
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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
34extern struct inode_operations jfs_file_inode_operations;
35extern struct inode_operations jfs_symlink_inode_operations;
36extern struct file_operations jfs_file_operations;
37extern struct address_space_operations jfs_aops;
38
39extern int jfs_fsync(struct file *, struct dentry *, int);
40extern void jfs_truncate_nolock(struct inode *, loff_t);
41extern int jfs_init_acl(struct inode *, struct inode *);
42
43/*
44 * forward references
45 */
46struct inode_operations jfs_dir_inode_operations;
47struct file_operations jfs_dir_operations;
48struct dentry_operations jfs_ci_dentry_operations;
49
50static s64 commitZeroLink(tid_t, struct inode *);
51
52/*
53 * NAME: jfs_create(dip, dentry, mode)
54 *
55 * FUNCTION: create a regular file in the parent directory <dip>
56 * with name = <from dentry> and mode = <mode>
57 *
58 * PARAMETER: dip - parent directory vnode
59 * dentry - dentry of new file
60 * mode - create mode (rwxrwxrwx).
61 * nd- nd struct
62 *
63 * RETURN: Errors from subroutines
64 *
65 */
66static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
67 struct nameidata *nd)
68{
69 int rc = 0;
70 tid_t tid; /* transaction id */
71 struct inode *ip = NULL; /* child directory inode */
72 ino_t ino;
73 struct component_name dname; /* child directory name */
74 struct btstack btstack;
75 struct inode *iplist[2];
76 struct tblock *tblk;
77
78 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
79
80 /*
81 * search parent directory for entry/freespace
82 * (dtSearch() returns parent directory page pinned)
83 */
84 if ((rc = get_UCSname(&dname, dentry)))
85 goto out1;
86
87 /*
88 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
89 * block there while holding dtree page, so we allocate the inode &
90 * begin the transaction before we search the directory.
91 */
92 ip = ialloc(dip, mode);
93 if (ip == NULL) {
94 rc = -ENOSPC;
95 goto out2;
96 }
97
98 tid = txBegin(dip->i_sb, 0);
99
100 down(&JFS_IP(dip)->commit_sem);
101 down(&JFS_IP(ip)->commit_sem);
102
103 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
104 jfs_err("jfs_create: dtSearch returned %d", rc);
105 goto out3;
106 }
107
108 tblk = tid_to_tblock(tid);
109 tblk->xflag |= COMMIT_CREATE;
110 tblk->ino = ip->i_ino;
111 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
112
113 iplist[0] = dip;
114 iplist[1] = ip;
115
116 /*
117 * initialize the child XAD tree root in-line in inode
118 */
119 xtInitRoot(tid, ip);
120
121 /*
122 * create entry in parent directory for child directory
123 * (dtInsert() releases parent directory page)
124 */
125 ino = ip->i_ino;
126 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
127 if (rc == -EIO) {
128 jfs_err("jfs_create: dtInsert returned -EIO");
129 txAbort(tid, 1); /* Marks Filesystem dirty */
130 } else
131 txAbort(tid, 0); /* Filesystem full */
132 goto out3;
133 }
134
135 ip->i_op = &jfs_file_inode_operations;
136 ip->i_fop = &jfs_file_operations;
137 ip->i_mapping->a_ops = &jfs_aops;
138
139 insert_inode_hash(ip);
140 mark_inode_dirty(ip);
141
142 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
143
144 mark_inode_dirty(dip);
145
146 rc = txCommit(tid, 2, &iplist[0], 0);
147
148 out3:
149 txEnd(tid);
150 up(&JFS_IP(dip)->commit_sem);
151 up(&JFS_IP(ip)->commit_sem);
152 if (rc) {
153 ip->i_nlink = 0;
154 iput(ip);
155 } else
156 d_instantiate(dentry, ip);
157
158 out2:
159 free_UCSname(&dname);
160
161#ifdef CONFIG_JFS_POSIX_ACL
162 if (rc == 0)
163 jfs_init_acl(ip, dip);
164#endif
165
166 out1:
167
168 jfs_info("jfs_create: rc:%d", rc);
169 return rc;
170}
171
172
173/*
174 * NAME: jfs_mkdir(dip, dentry, mode)
175 *
176 * FUNCTION: create a child directory in the parent directory <dip>
177 * with name = <from dentry> and mode = <mode>
178 *
179 * PARAMETER: dip - parent directory vnode
180 * dentry - dentry of child directory
181 * mode - create mode (rwxrwxrwx).
182 *
183 * RETURN: Errors from subroutines
184 *
185 * note:
186 * EACCESS: user needs search+write permission on the parent directory
187 */
188static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
189{
190 int rc = 0;
191 tid_t tid; /* transaction id */
192 struct inode *ip = NULL; /* child directory inode */
193 ino_t ino;
194 struct component_name dname; /* child directory name */
195 struct btstack btstack;
196 struct inode *iplist[2];
197 struct tblock *tblk;
198
199 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
200
201 /* link count overflow on parent directory ? */
202 if (dip->i_nlink == JFS_LINK_MAX) {
203 rc = -EMLINK;
204 goto out1;
205 }
206
207 /*
208 * search parent directory for entry/freespace
209 * (dtSearch() returns parent directory page pinned)
210 */
211 if ((rc = get_UCSname(&dname, dentry)))
212 goto out1;
213
214 /*
215 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
216 * block there while holding dtree page, so we allocate the inode &
217 * begin the transaction before we search the directory.
218 */
219 ip = ialloc(dip, S_IFDIR | mode);
220 if (ip == NULL) {
221 rc = -ENOSPC;
222 goto out2;
223 }
224
225 tid = txBegin(dip->i_sb, 0);
226
227 down(&JFS_IP(dip)->commit_sem);
228 down(&JFS_IP(ip)->commit_sem);
229
230 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
231 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
232 goto out3;
233 }
234
235 tblk = tid_to_tblock(tid);
236 tblk->xflag |= COMMIT_CREATE;
237 tblk->ino = ip->i_ino;
238 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
239
240 iplist[0] = dip;
241 iplist[1] = ip;
242
243 /*
244 * initialize the child directory in-line in inode
245 */
246 dtInitRoot(tid, ip, dip->i_ino);
247
248 /*
249 * create entry in parent directory for child directory
250 * (dtInsert() releases parent directory page)
251 */
252 ino = ip->i_ino;
253 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
254 if (rc == -EIO) {
255 jfs_err("jfs_mkdir: dtInsert returned -EIO");
256 txAbort(tid, 1); /* Marks Filesystem dirty */
257 } else
258 txAbort(tid, 0); /* Filesystem full */
259 goto out3;
260 }
261
262 ip->i_nlink = 2; /* for '.' */
263 ip->i_op = &jfs_dir_inode_operations;
264 ip->i_fop = &jfs_dir_operations;
265
266 insert_inode_hash(ip);
267 mark_inode_dirty(ip);
268
269 /* update parent directory inode */
270 dip->i_nlink++; /* for '..' from child directory */
271 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
272 mark_inode_dirty(dip);
273
274 rc = txCommit(tid, 2, &iplist[0], 0);
275
276 out3:
277 txEnd(tid);
278 up(&JFS_IP(dip)->commit_sem);
279 up(&JFS_IP(ip)->commit_sem);
280 if (rc) {
281 ip->i_nlink = 0;
282 iput(ip);
283 } else
284 d_instantiate(dentry, ip);
285
286 out2:
287 free_UCSname(&dname);
288
289#ifdef CONFIG_JFS_POSIX_ACL
290 if (rc == 0)
291 jfs_init_acl(ip, dip);
292#endif
293
294 out1:
295
296 jfs_info("jfs_mkdir: rc:%d", rc);
297 return rc;
298}
299
300/*
301 * NAME: jfs_rmdir(dip, dentry)
302 *
303 * FUNCTION: remove a link to child directory
304 *
305 * PARAMETER: dip - parent inode
306 * dentry - child directory dentry
307 *
308 * RETURN: -EINVAL - if name is . or ..
309 * -EINVAL - if . or .. exist but are invalid.
310 * errors from subroutines
311 *
312 * note:
313 * if other threads have the directory open when the last link
314 * is removed, the "." and ".." entries, if present, are removed before
315 * rmdir() returns and no new entries may be created in the directory,
316 * but the directory is not removed until the last reference to
317 * the directory is released (cf.unlink() of regular file).
318 */
319static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
320{
321 int rc;
322 tid_t tid; /* transaction id */
323 struct inode *ip = dentry->d_inode;
324 ino_t ino;
325 struct component_name dname;
326 struct inode *iplist[2];
327 struct tblock *tblk;
328
329 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
330
331 /* Init inode for quota operations. */
332 DQUOT_INIT(ip);
333
334 /* directory must be empty to be removed */
335 if (!dtEmpty(ip)) {
336 rc = -ENOTEMPTY;
337 goto out;
338 }
339
340 if ((rc = get_UCSname(&dname, dentry))) {
341 goto out;
342 }
343
344 tid = txBegin(dip->i_sb, 0);
345
346 down(&JFS_IP(dip)->commit_sem);
347 down(&JFS_IP(ip)->commit_sem);
348
349 iplist[0] = dip;
350 iplist[1] = ip;
351
352 tblk = tid_to_tblock(tid);
353 tblk->xflag |= COMMIT_DELETE;
354 tblk->u.ip = ip;
355
356 /*
357 * delete the entry of target directory from parent directory
358 */
359 ino = ip->i_ino;
360 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
361 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
362 if (rc == -EIO)
363 txAbort(tid, 1);
364 txEnd(tid);
365 up(&JFS_IP(dip)->commit_sem);
366 up(&JFS_IP(ip)->commit_sem);
367
368 goto out2;
369 }
370
371 /* update parent directory's link count corresponding
372 * to ".." entry of the target directory deleted
373 */
374 dip->i_nlink--;
375 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
376 mark_inode_dirty(dip);
377
378 /*
379 * OS/2 could have created EA and/or ACL
380 */
381 /* free EA from both persistent and working map */
382 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
383 /* free EA pages */
384 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
385 }
386 JFS_IP(ip)->ea.flag = 0;
387
388 /* free ACL from both persistent and working map */
389 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
390 /* free ACL pages */
391 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
392 }
393 JFS_IP(ip)->acl.flag = 0;
394
395 /* mark the target directory as deleted */
396 ip->i_nlink = 0;
397 mark_inode_dirty(ip);
398
399 rc = txCommit(tid, 2, &iplist[0], 0);
400
401 txEnd(tid);
402
403 up(&JFS_IP(dip)->commit_sem);
404 up(&JFS_IP(ip)->commit_sem);
405
406 /*
407 * Truncating the directory index table is not guaranteed. It
408 * may need to be done iteratively
409 */
410 if (test_cflag(COMMIT_Stale, dip)) {
411 if (dip->i_size > 1)
412 jfs_truncate_nolock(dip, 0);
413
414 clear_cflag(COMMIT_Stale, dip);
415 }
416
417 out2:
418 free_UCSname(&dname);
419
420 out:
421 jfs_info("jfs_rmdir: rc:%d", rc);
422 return rc;
423}
424
425/*
426 * NAME: jfs_unlink(dip, dentry)
427 *
428 * FUNCTION: remove a link to object <vp> named by <name>
429 * from parent directory <dvp>
430 *
431 * PARAMETER: dip - inode of parent directory
432 * dentry - dentry of object to be removed
433 *
434 * RETURN: errors from subroutines
435 *
436 * note:
437 * temporary file: if one or more processes have the file open
438 * when the last link is removed, the link will be removed before
439 * unlink() returns, but the removal of the file contents will be
440 * postponed until all references to the files are closed.
441 *
442 * JFS does NOT support unlink() on directories.
443 *
444 */
445static int jfs_unlink(struct inode *dip, struct dentry *dentry)
446{
447 int rc;
448 tid_t tid; /* transaction id */
449 struct inode *ip = dentry->d_inode;
450 ino_t ino;
451 struct component_name dname; /* object name */
452 struct inode *iplist[2];
453 struct tblock *tblk;
454 s64 new_size = 0;
455 int commit_flag;
456
457 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
458
459 /* Init inode for quota operations. */
460 DQUOT_INIT(ip);
461
462 if ((rc = get_UCSname(&dname, dentry)))
463 goto out;
464
465 IWRITE_LOCK(ip);
466
467 tid = txBegin(dip->i_sb, 0);
468
469 down(&JFS_IP(dip)->commit_sem);
470 down(&JFS_IP(ip)->commit_sem);
471
472 iplist[0] = dip;
473 iplist[1] = ip;
474
475 /*
476 * delete the entry of target file from parent directory
477 */
478 ino = ip->i_ino;
479 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
480 jfs_err("jfs_unlink: dtDelete returned %d", rc);
481 if (rc == -EIO)
482 txAbort(tid, 1); /* Marks FS Dirty */
483 txEnd(tid);
484 up(&JFS_IP(dip)->commit_sem);
485 up(&JFS_IP(ip)->commit_sem);
486 IWRITE_UNLOCK(ip);
487 goto out1;
488 }
489
490 ASSERT(ip->i_nlink);
491
492 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
493 mark_inode_dirty(dip);
494
495 /* update target's inode */
496 ip->i_nlink--;
497 mark_inode_dirty(ip);
498
499 /*
500 * commit zero link count object
501 */
502 if (ip->i_nlink == 0) {
503 assert(!test_cflag(COMMIT_Nolink, ip));
504 /* free block resources */
505 if ((new_size = commitZeroLink(tid, ip)) < 0) {
506 txAbort(tid, 1); /* Marks FS Dirty */
507 txEnd(tid);
508 up(&JFS_IP(dip)->commit_sem);
509 up(&JFS_IP(ip)->commit_sem);
510 IWRITE_UNLOCK(ip);
511 rc = new_size;
512 goto out1;
513 }
514 tblk = tid_to_tblock(tid);
515 tblk->xflag |= COMMIT_DELETE;
516 tblk->u.ip = ip;
517 }
518
519 /*
520 * Incomplete truncate of file data can
521 * result in timing problems unless we synchronously commit the
522 * transaction.
523 */
524 if (new_size)
525 commit_flag = COMMIT_SYNC;
526 else
527 commit_flag = 0;
528
529 /*
530 * If xtTruncate was incomplete, commit synchronously to avoid
531 * timing complications
532 */
533 rc = txCommit(tid, 2, &iplist[0], commit_flag);
534
535 txEnd(tid);
536
537 up(&JFS_IP(dip)->commit_sem);
538 up(&JFS_IP(ip)->commit_sem);
539
540
541 while (new_size && (rc == 0)) {
542 tid = txBegin(dip->i_sb, 0);
543 down(&JFS_IP(ip)->commit_sem);
544 new_size = xtTruncate_pmap(tid, ip, new_size);
545 if (new_size < 0) {
546 txAbort(tid, 1); /* Marks FS Dirty */
547 rc = new_size;
548 } else
549 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
550 txEnd(tid);
551 up(&JFS_IP(ip)->commit_sem);
552 }
553
554 if (ip->i_nlink == 0)
555 set_cflag(COMMIT_Nolink, ip);
556
557 IWRITE_UNLOCK(ip);
558
559 /*
560 * Truncating the directory index table is not guaranteed. It
561 * may need to be done iteratively
562 */
563 if (test_cflag(COMMIT_Stale, dip)) {
564 if (dip->i_size > 1)
565 jfs_truncate_nolock(dip, 0);
566
567 clear_cflag(COMMIT_Stale, dip);
568 }
569
570 out1:
571 free_UCSname(&dname);
572 out:
573 jfs_info("jfs_unlink: rc:%d", rc);
574 return rc;
575}
576
577/*
578 * NAME: commitZeroLink()
579 *
580 * FUNCTION: for non-directory, called by jfs_remove(),
581 * truncate a regular file, directory or symbolic
582 * link to zero length. return 0 if type is not
583 * one of these.
584 *
585 * if the file is currently associated with a VM segment
586 * only permanent disk and inode map resources are freed,
587 * and neither the inode nor indirect blocks are modified
588 * so that the resources can be later freed in the work
589 * map by ctrunc1.
590 * if there is no VM segment on entry, the resources are
591 * freed in both work and permanent map.
592 * (? for temporary file - memory object is cached even
593 * after no reference:
594 * reference count > 0 - )
595 *
596 * PARAMETERS: cd - pointer to commit data structure.
597 * current inode is the one to truncate.
598 *
599 * RETURN: Errors from subroutines
600 */
601static s64 commitZeroLink(tid_t tid, struct inode *ip)
602{
603 int filetype;
604 struct tblock *tblk;
605
606 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
607
608 filetype = ip->i_mode & S_IFMT;
609 switch (filetype) {
610 case S_IFREG:
611 break;
612 case S_IFLNK:
613 /* fast symbolic link */
614 if (ip->i_size < IDATASIZE) {
615 ip->i_size = 0;
616 return 0;
617 }
618 break;
619 default:
620 assert(filetype != S_IFDIR);
621 return 0;
622 }
623
624 set_cflag(COMMIT_Freewmap, ip);
625
626 /* mark transaction of block map update type */
627 tblk = tid_to_tblock(tid);
628 tblk->xflag |= COMMIT_PMAP;
629
630 /*
631 * free EA
632 */
633 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
634 /* acquire maplock on EA to be freed from block map */
635 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
636
637 /*
638 * free ACL
639 */
640 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
641 /* acquire maplock on EA to be freed from block map */
642 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
643
644 /*
645 * free xtree/data (truncate to zero length):
646 * free xtree/data pages from cache if COMMIT_PWMAP,
647 * free xtree/data blocks from persistent block map, and
648 * free xtree/data blocks from working block map if COMMIT_PWMAP;
649 */
650 if (ip->i_size)
651 return xtTruncate_pmap(tid, ip, 0);
652
653 return 0;
654}
655
656
657/*
658 * NAME: freeZeroLink()
659 *
660 * FUNCTION: for non-directory, called by iClose(),
661 * free resources of a file from cache and WORKING map
662 * for a file previously committed with zero link count
663 * while associated with a pager object,
664 *
665 * PARAMETER: ip - pointer to inode of file.
666 *
667 * RETURN: 0 -ok
668 */
669int freeZeroLink(struct inode *ip)
670{
671 int rc = 0;
672 int type;
673
674 jfs_info("freeZeroLink: ip = 0x%p", ip);
675
676 /* return if not reg or symbolic link or if size is
677 * already ok.
678 */
679 type = ip->i_mode & S_IFMT;
680
681 switch (type) {
682 case S_IFREG:
683 break;
684 case S_IFLNK:
685 /* if its contained in inode nothing to do */
686 if (ip->i_size < IDATASIZE)
687 return 0;
688 break;
689 default:
690 return 0;
691 }
692
693 /*
694 * free EA
695 */
696 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
697 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
698 int xlen = lengthDXD(&JFS_IP(ip)->ea);
699 struct maplock maplock; /* maplock for COMMIT_WMAP */
700 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
701
702 /* free EA pages from cache */
703 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
704
705 /* free EA extent from working block map */
706 maplock.index = 1;
707 pxdlock = (struct pxd_lock *) & maplock;
708 pxdlock->flag = mlckFREEPXD;
709 PXDaddress(&pxdlock->pxd, xaddr);
710 PXDlength(&pxdlock->pxd, xlen);
711 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
712 }
713
714 /*
715 * free ACL
716 */
717 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
718 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
719 int xlen = lengthDXD(&JFS_IP(ip)->acl);
720 struct maplock maplock; /* maplock for COMMIT_WMAP */
721 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
722
723 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
724
725 /* free ACL extent from working block map */
726 maplock.index = 1;
727 pxdlock = (struct pxd_lock *) & maplock;
728 pxdlock->flag = mlckFREEPXD;
729 PXDaddress(&pxdlock->pxd, xaddr);
730 PXDlength(&pxdlock->pxd, xlen);
731 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
732 }
733
734 /*
735 * free xtree/data (truncate to zero length):
736 * free xtree/data pages from cache, and
737 * free xtree/data blocks from working block map;
738 */
739 if (ip->i_size)
740 rc = xtTruncate(0, ip, 0, COMMIT_WMAP);
741
742 return rc;
743}
744
745/*
746 * NAME: jfs_link(vp, dvp, name, crp)
747 *
748 * FUNCTION: create a link to <vp> by the name = <name>
749 * in the parent directory <dvp>
750 *
751 * PARAMETER: vp - target object
752 * dvp - parent directory of new link
753 * name - name of new link to target object
754 * crp - credential
755 *
756 * RETURN: Errors from subroutines
757 *
758 * note:
759 * JFS does NOT support link() on directories (to prevent circular
760 * path in the directory hierarchy);
761 * EPERM: the target object is a directory, and either the caller
762 * does not have appropriate privileges or the implementation prohibits
763 * using link() on directories [XPG4.2].
764 *
765 * JFS does NOT support links between file systems:
766 * EXDEV: target object and new link are on different file systems and
767 * implementation does not support links between file systems [XPG4.2].
768 */
769static int jfs_link(struct dentry *old_dentry,
770 struct inode *dir, struct dentry *dentry)
771{
772 int rc;
773 tid_t tid;
774 struct inode *ip = old_dentry->d_inode;
775 ino_t ino;
776 struct component_name dname;
777 struct btstack btstack;
778 struct inode *iplist[2];
779
780 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
781 dentry->d_name.name);
782
783 if (ip->i_nlink == JFS_LINK_MAX)
784 return -EMLINK;
785
786 if (ip->i_nlink == 0)
787 return -ENOENT;
788
789 tid = txBegin(ip->i_sb, 0);
790
791 down(&JFS_IP(dir)->commit_sem);
792 down(&JFS_IP(ip)->commit_sem);
793
794 /*
795 * scan parent directory for entry/freespace
796 */
797 if ((rc = get_UCSname(&dname, dentry)))
798 goto out;
799
800 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
801 goto free_dname;
802
803 /*
804 * create entry for new link in parent directory
805 */
806 ino = ip->i_ino;
807 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
808 goto free_dname;
809
810 /* update object inode */
811 ip->i_nlink++; /* for new link */
812 ip->i_ctime = CURRENT_TIME;
813 mark_inode_dirty(dir);
814 atomic_inc(&ip->i_count);
815
816 iplist[0] = ip;
817 iplist[1] = dir;
818 rc = txCommit(tid, 2, &iplist[0], 0);
819
820 if (rc) {
821 ip->i_nlink--;
822 iput(ip);
823 } else
824 d_instantiate(dentry, ip);
825
826 free_dname:
827 free_UCSname(&dname);
828
829 out:
830 txEnd(tid);
831
832 up(&JFS_IP(dir)->commit_sem);
833 up(&JFS_IP(ip)->commit_sem);
834
835 jfs_info("jfs_link: rc:%d", rc);
836 return rc;
837}
838
839/*
840 * NAME: jfs_symlink(dip, dentry, name)
841 *
842 * FUNCTION: creates a symbolic link to <symlink> by name <name>
843 * in directory <dip>
844 *
845 * PARAMETER: dip - parent directory vnode
846 * dentry - dentry of symbolic link
847 * name - the path name of the existing object
848 * that will be the source of the link
849 *
850 * RETURN: errors from subroutines
851 *
852 * note:
853 * ENAMETOOLONG: pathname resolution of a symbolic link produced
854 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
855*/
856
857static int jfs_symlink(struct inode *dip, struct dentry *dentry,
858 const char *name)
859{
860 int rc;
861 tid_t tid;
862 ino_t ino = 0;
863 struct component_name dname;
864 int ssize; /* source pathname size */
865 struct btstack btstack;
866 struct inode *ip = dentry->d_inode;
867 unchar *i_fastsymlink;
868 s64 xlen = 0;
869 int bmask = 0, xsize;
870 s64 extent = 0, xaddr;
871 struct metapage *mp;
872 struct super_block *sb;
873 struct tblock *tblk;
874
875 struct inode *iplist[2];
876
877 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
878
879 ssize = strlen(name) + 1;
880
881 /*
882 * search parent directory for entry/freespace
883 * (dtSearch() returns parent directory page pinned)
884 */
885
886 if ((rc = get_UCSname(&dname, dentry)))
887 goto out1;
888
889 /*
890 * allocate on-disk/in-memory inode for symbolic link:
891 * (iAlloc() returns new, locked inode)
892 */
893 ip = ialloc(dip, S_IFLNK | 0777);
894 if (ip == NULL) {
895 rc = -ENOSPC;
896 goto out2;
897 }
898
899 tid = txBegin(dip->i_sb, 0);
900
901 down(&JFS_IP(dip)->commit_sem);
902 down(&JFS_IP(ip)->commit_sem);
903
904 tblk = tid_to_tblock(tid);
905 tblk->xflag |= COMMIT_CREATE;
906 tblk->ino = ip->i_ino;
907 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
908
909 /* fix symlink access permission
910 * (dir_create() ANDs in the u.u_cmask,
911 * but symlinks really need to be 777 access)
912 */
913 ip->i_mode |= 0777;
914
915 /*
916 * write symbolic link target path name
917 */
918 xtInitRoot(tid, ip);
919
920 /*
921 * write source path name inline in on-disk inode (fast symbolic link)
922 */
923
924 if (ssize <= IDATASIZE) {
925 ip->i_op = &jfs_symlink_inode_operations;
926
927 i_fastsymlink = JFS_IP(ip)->i_inline;
928 memcpy(i_fastsymlink, name, ssize);
929 ip->i_size = ssize - 1;
930
931 /*
932 * if symlink is > 128 bytes, we don't have the space to
933 * store inline extended attributes
934 */
935 if (ssize > sizeof (JFS_IP(ip)->i_inline))
936 JFS_IP(ip)->mode2 &= ~INLINEEA;
937
938 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
939 ssize, name);
940 }
941 /*
942 * write source path name in a single extent
943 */
944 else {
945 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
946
947 ip->i_op = &page_symlink_inode_operations;
948 ip->i_mapping->a_ops = &jfs_aops;
949
950 /*
951 * even though the data of symlink object (source
952 * path name) is treated as non-journaled user data,
953 * it is read/written thru buffer cache for performance.
954 */
955 sb = ip->i_sb;
956 bmask = JFS_SBI(sb)->bsize - 1;
957 xsize = (ssize + bmask) & ~bmask;
958 xaddr = 0;
959 xlen = xsize >> JFS_SBI(sb)->l2bsize;
960 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
961 txAbort(tid, 0);
962 rc = -ENOSPC;
963 goto out3;
964 }
965 extent = xaddr;
966 ip->i_size = ssize - 1;
967 while (ssize) {
968 /* This is kind of silly since PATH_MAX == 4K */
969 int copy_size = min(ssize, PSIZE);
970
971 mp = get_metapage(ip, xaddr, PSIZE, 1);
972
973 if (mp == NULL) {
974 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
975 rc = -EIO;
976 txAbort(tid, 0);
977 goto out3;
978 }
979 memcpy(mp->data, name, copy_size);
980 flush_metapage(mp);
981 ssize -= copy_size;
982 name += copy_size;
983 xaddr += JFS_SBI(sb)->nbperpage;
984 }
985 }
986
987 /*
988 * create entry for symbolic link in parent directory
989 */
990 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
991 if (rc == 0) {
992 ino = ip->i_ino;
993 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
994 }
995 if (rc) {
996 if (xlen)
997 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
998 txAbort(tid, 0);
999 /* discard new inode */
1000 goto out3;
1001 }
1002
1003 insert_inode_hash(ip);
1004 mark_inode_dirty(ip);
1005
1006 /*
1007 * commit update of parent directory and link object
1008 */
1009
1010 iplist[0] = dip;
1011 iplist[1] = ip;
1012 rc = txCommit(tid, 2, &iplist[0], 0);
1013
1014 out3:
1015 txEnd(tid);
1016 up(&JFS_IP(dip)->commit_sem);
1017 up(&JFS_IP(ip)->commit_sem);
1018 if (rc) {
1019 ip->i_nlink = 0;
1020 iput(ip);
1021 } else
1022 d_instantiate(dentry, ip);
1023
1024 out2:
1025 free_UCSname(&dname);
1026
1027#ifdef CONFIG_JFS_POSIX_ACL
1028 if (rc == 0)
1029 jfs_init_acl(ip, dip);
1030#endif
1031
1032 out1:
1033 jfs_info("jfs_symlink: rc:%d", rc);
1034 return rc;
1035}
1036
1037
1038/*
1039 * NAME: jfs_rename
1040 *
1041 * FUNCTION: rename a file or directory
1042 */
1043static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1044 struct inode *new_dir, struct dentry *new_dentry)
1045{
1046 struct btstack btstack;
1047 ino_t ino;
1048 struct component_name new_dname;
1049 struct inode *new_ip;
1050 struct component_name old_dname;
1051 struct inode *old_ip;
1052 int rc;
1053 tid_t tid;
1054 struct tlock *tlck;
1055 struct dt_lock *dtlck;
1056 struct lv *lv;
1057 int ipcount;
1058 struct inode *iplist[4];
1059 struct tblock *tblk;
1060 s64 new_size = 0;
1061 int commit_flag;
1062
1063
1064 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1065 new_dentry->d_name.name);
1066
1067 old_ip = old_dentry->d_inode;
1068 new_ip = new_dentry->d_inode;
1069
1070 if ((rc = get_UCSname(&old_dname, old_dentry)))
1071 goto out1;
1072
1073 if ((rc = get_UCSname(&new_dname, new_dentry)))
1074 goto out2;
1075
1076 /*
1077 * Make sure source inode number is what we think it is
1078 */
1079 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1080 if (rc || (ino != old_ip->i_ino)) {
1081 rc = -ENOENT;
1082 goto out3;
1083 }
1084
1085 /*
1086 * Make sure dest inode number (if any) is what we think it is
1087 */
1088 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1089 if (rc == 0) {
1090 if ((new_ip == 0) || (ino != new_ip->i_ino)) {
1091 rc = -ESTALE;
1092 goto out3;
1093 }
1094 } else if (rc != -ENOENT)
1095 goto out3;
1096 else if (new_ip) {
1097 /* no entry exists, but one was expected */
1098 rc = -ESTALE;
1099 goto out3;
1100 }
1101
1102 if (S_ISDIR(old_ip->i_mode)) {
1103 if (new_ip) {
1104 if (!dtEmpty(new_ip)) {
1105 rc = -ENOTEMPTY;
1106 goto out3;
1107 }
1108 } else if ((new_dir != old_dir) &&
1109 (new_dir->i_nlink == JFS_LINK_MAX)) {
1110 rc = -EMLINK;
1111 goto out3;
1112 }
1113 } else if (new_ip) {
1114 IWRITE_LOCK(new_ip);
1115 /* Init inode for quota operations. */
1116 DQUOT_INIT(new_ip);
1117 }
1118
1119 /*
1120 * The real work starts here
1121 */
1122 tid = txBegin(new_dir->i_sb, 0);
1123
1124 down(&JFS_IP(new_dir)->commit_sem);
1125 down(&JFS_IP(old_ip)->commit_sem);
1126 if (old_dir != new_dir)
1127 down(&JFS_IP(old_dir)->commit_sem);
1128
1129 if (new_ip) {
1130 down(&JFS_IP(new_ip)->commit_sem);
1131 /*
1132 * Change existing directory entry to new inode number
1133 */
1134 ino = new_ip->i_ino;
1135 rc = dtModify(tid, new_dir, &new_dname, &ino,
1136 old_ip->i_ino, JFS_RENAME);
1137 if (rc)
1138 goto out4;
1139 new_ip->i_nlink--;
1140 if (S_ISDIR(new_ip->i_mode)) {
1141 new_ip->i_nlink--;
1142 if (new_ip->i_nlink) {
1143 up(&JFS_IP(new_dir)->commit_sem);
1144 up(&JFS_IP(old_ip)->commit_sem);
1145 if (old_dir != new_dir)
1146 up(&JFS_IP(old_dir)->commit_sem);
1147 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1148 IWRITE_UNLOCK(new_ip);
1149 jfs_error(new_ip->i_sb,
1150 "jfs_rename: new_ip->i_nlink != 0");
1151 return -EIO;
1152 }
1153 tblk = tid_to_tblock(tid);
1154 tblk->xflag |= COMMIT_DELETE;
1155 tblk->u.ip = new_ip;
1156 } else if (new_ip->i_nlink == 0) {
1157 assert(!test_cflag(COMMIT_Nolink, new_ip));
1158 /* free block resources */
1159 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1160 txAbort(tid, 1); /* Marks FS Dirty */
1161 rc = new_size;
1162 goto out4;
1163 }
1164 tblk = tid_to_tblock(tid);
1165 tblk->xflag |= COMMIT_DELETE;
1166 tblk->u.ip = new_ip;
1167 } else {
1168 new_ip->i_ctime = CURRENT_TIME;
1169 mark_inode_dirty(new_ip);
1170 }
1171 } else {
1172 /*
1173 * Add new directory entry
1174 */
1175 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1176 JFS_CREATE);
1177 if (rc) {
1178 jfs_err("jfs_rename didn't expect dtSearch to fail "
1179 "w/rc = %d", rc);
1180 goto out4;
1181 }
1182
1183 ino = old_ip->i_ino;
1184 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1185 if (rc) {
1186 if (rc == -EIO)
1187 jfs_err("jfs_rename: dtInsert returned -EIO");
1188 goto out4;
1189 }
1190 if (S_ISDIR(old_ip->i_mode))
1191 new_dir->i_nlink++;
1192 }
1193 /*
1194 * Remove old directory entry
1195 */
1196
1197 ino = old_ip->i_ino;
1198 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1199 if (rc) {
1200 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1201 rc);
1202 txAbort(tid, 1); /* Marks Filesystem dirty */
1203 goto out4;
1204 }
1205 if (S_ISDIR(old_ip->i_mode)) {
1206 old_dir->i_nlink--;
1207 if (old_dir != new_dir) {
1208 /*
1209 * Change inode number of parent for moved directory
1210 */
1211
1212 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1213 cpu_to_le32(new_dir->i_ino);
1214
1215 /* Linelock header of dtree */
1216 tlck = txLock(tid, old_ip,
1217 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1218 tlckDTREE | tlckBTROOT | tlckRELINK);
1219 dtlck = (struct dt_lock *) & tlck->lock;
1220 ASSERT(dtlck->index == 0);
1221 lv = & dtlck->lv[0];
1222 lv->offset = 0;
1223 lv->length = 1;
1224 dtlck->index++;
1225 }
1226 }
1227
1228 /*
1229 * Update ctime on changed/moved inodes & mark dirty
1230 */
1231 old_ip->i_ctime = CURRENT_TIME;
1232 mark_inode_dirty(old_ip);
1233
1234 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1235 mark_inode_dirty(new_dir);
1236
1237 /* Build list of inodes modified by this transaction */
1238 ipcount = 0;
1239 iplist[ipcount++] = old_ip;
1240 if (new_ip)
1241 iplist[ipcount++] = new_ip;
1242 iplist[ipcount++] = old_dir;
1243
1244 if (old_dir != new_dir) {
1245 iplist[ipcount++] = new_dir;
1246 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1247 mark_inode_dirty(old_dir);
1248 }
1249
1250 /*
1251 * Incomplete truncate of file data can
1252 * result in timing problems unless we synchronously commit the
1253 * transaction.
1254 */
1255 if (new_size)
1256 commit_flag = COMMIT_SYNC;
1257 else
1258 commit_flag = 0;
1259
1260 rc = txCommit(tid, ipcount, iplist, commit_flag);
1261
1262 out4:
1263 txEnd(tid);
1264
1265 up(&JFS_IP(new_dir)->commit_sem);
1266 up(&JFS_IP(old_ip)->commit_sem);
1267 if (old_dir != new_dir)
1268 up(&JFS_IP(old_dir)->commit_sem);
1269 if (new_ip)
1270 up(&JFS_IP(new_ip)->commit_sem);
1271
1272 while (new_size && (rc == 0)) {
1273 tid = txBegin(new_ip->i_sb, 0);
1274 down(&JFS_IP(new_ip)->commit_sem);
1275 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1276 if (new_size < 0) {
1277 txAbort(tid, 1);
1278 rc = new_size;
1279 } else
1280 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1281 txEnd(tid);
1282 up(&JFS_IP(new_ip)->commit_sem);
1283 }
1284 if (new_ip && (new_ip->i_nlink == 0))
1285 set_cflag(COMMIT_Nolink, new_ip);
1286 out3:
1287 free_UCSname(&new_dname);
1288 out2:
1289 free_UCSname(&old_dname);
1290 out1:
1291 if (new_ip && !S_ISDIR(new_ip->i_mode))
1292 IWRITE_UNLOCK(new_ip);
1293 /*
1294 * Truncating the directory index table is not guaranteed. It
1295 * may need to be done iteratively
1296 */
1297 if (test_cflag(COMMIT_Stale, old_dir)) {
1298 if (old_dir->i_size > 1)
1299 jfs_truncate_nolock(old_dir, 0);
1300
1301 clear_cflag(COMMIT_Stale, old_dir);
1302 }
1303
1304 jfs_info("jfs_rename: returning %d", rc);
1305 return rc;
1306}
1307
1308
1309/*
1310 * NAME: jfs_mknod
1311 *
1312 * FUNCTION: Create a special file (device)
1313 */
1314static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1315 int mode, dev_t rdev)
1316{
1317 struct jfs_inode_info *jfs_ip;
1318 struct btstack btstack;
1319 struct component_name dname;
1320 ino_t ino;
1321 struct inode *ip;
1322 struct inode *iplist[2];
1323 int rc;
1324 tid_t tid;
1325 struct tblock *tblk;
1326
1327 if (!new_valid_dev(rdev))
1328 return -EINVAL;
1329
1330 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1331
1332 if ((rc = get_UCSname(&dname, dentry)))
1333 goto out;
1334
1335 ip = ialloc(dir, mode);
1336 if (ip == NULL) {
1337 rc = -ENOSPC;
1338 goto out1;
1339 }
1340 jfs_ip = JFS_IP(ip);
1341
1342 tid = txBegin(dir->i_sb, 0);
1343
1344 down(&JFS_IP(dir)->commit_sem);
1345 down(&JFS_IP(ip)->commit_sem);
1346
1347 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
1348 goto out3;
1349
1350 tblk = tid_to_tblock(tid);
1351 tblk->xflag |= COMMIT_CREATE;
1352 tblk->ino = ip->i_ino;
1353 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1354
1355 ino = ip->i_ino;
1356 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
1357 goto out3;
1358
1359 ip->i_op = &jfs_file_inode_operations;
1360 jfs_ip->dev = new_encode_dev(rdev);
1361 init_special_inode(ip, ip->i_mode, rdev);
1362
1363 insert_inode_hash(ip);
1364 mark_inode_dirty(ip);
1365
1366 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1367
1368 mark_inode_dirty(dir);
1369
1370 iplist[0] = dir;
1371 iplist[1] = ip;
1372 rc = txCommit(tid, 2, iplist, 0);
1373
1374 out3:
1375 txEnd(tid);
1376 up(&JFS_IP(ip)->commit_sem);
1377 up(&JFS_IP(dir)->commit_sem);
1378 if (rc) {
1379 ip->i_nlink = 0;
1380 iput(ip);
1381 } else
1382 d_instantiate(dentry, ip);
1383
1384 out1:
1385 free_UCSname(&dname);
1386
1387#ifdef CONFIG_JFS_POSIX_ACL
1388 if (rc == 0)
1389 jfs_init_acl(ip, dir);
1390#endif
1391
1392 out:
1393 jfs_info("jfs_mknod: returning %d", rc);
1394 return rc;
1395}
1396
1397static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1398{
1399 struct btstack btstack;
1400 ino_t inum;
1401 struct inode *ip;
1402 struct component_name key;
1403 const char *name = dentry->d_name.name;
1404 int len = dentry->d_name.len;
1405 int rc;
1406
1407 jfs_info("jfs_lookup: name = %s", name);
1408
1409
1410 if ((name[0] == '.') && (len == 1))
1411 inum = dip->i_ino;
1412 else if (strcmp(name, "..") == 0)
1413 inum = PARENT(dip);
1414 else {
1415 if ((rc = get_UCSname(&key, dentry)))
1416 return ERR_PTR(rc);
1417 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1418 free_UCSname(&key);
1419 if (rc == -ENOENT) {
1420 d_add(dentry, NULL);
1421 return ERR_PTR(0);
1422 } else if (rc) {
1423 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1424 return ERR_PTR(rc);
1425 }
1426 }
1427
1428 ip = iget(dip->i_sb, inum);
1429 if (ip == NULL || is_bad_inode(ip)) {
1430 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1431 if (ip)
1432 iput(ip);
1433 return ERR_PTR(-EACCES);
1434 }
1435
1436 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1437 dentry->d_op = &jfs_ci_dentry_operations;
1438
1439 dentry = d_splice_alias(ip, dentry);
1440
1441 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1442 dentry->d_op = &jfs_ci_dentry_operations;
1443
1444 return dentry;
1445}
1446
1447struct dentry *jfs_get_parent(struct dentry *dentry)
1448{
1449 struct super_block *sb = dentry->d_inode->i_sb;
1450 struct dentry *parent = ERR_PTR(-ENOENT);
1451 struct inode *inode;
1452 unsigned long parent_ino;
1453
1454 parent_ino =
1455 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1456 inode = iget(sb, parent_ino);
1457 if (inode) {
1458 if (is_bad_inode(inode)) {
1459 iput(inode);
1460 parent = ERR_PTR(-EACCES);
1461 } else {
1462 parent = d_alloc_anon(inode);
1463 if (!parent) {
1464 parent = ERR_PTR(-ENOMEM);
1465 iput(inode);
1466 }
1467 }
1468 }
1469
1470 return parent;
1471}
1472
1473struct inode_operations jfs_dir_inode_operations = {
1474 .create = jfs_create,
1475 .lookup = jfs_lookup,
1476 .link = jfs_link,
1477 .unlink = jfs_unlink,
1478 .symlink = jfs_symlink,
1479 .mkdir = jfs_mkdir,
1480 .rmdir = jfs_rmdir,
1481 .mknod = jfs_mknod,
1482 .rename = jfs_rename,
1483 .setxattr = jfs_setxattr,
1484 .getxattr = jfs_getxattr,
1485 .listxattr = jfs_listxattr,
1486 .removexattr = jfs_removexattr,
1487#ifdef CONFIG_JFS_POSIX_ACL
1488 .setattr = jfs_setattr,
1489 .permission = jfs_permission,
1490#endif
1491};
1492
1493struct file_operations jfs_dir_operations = {
1494 .read = generic_read_dir,
1495 .readdir = jfs_readdir,
1496 .fsync = jfs_fsync,
1497};
1498
1499static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1500{
1501 unsigned long hash;
1502 int i;
1503
1504 hash = init_name_hash();
1505 for (i=0; i < this->len; i++)
1506 hash = partial_name_hash(tolower(this->name[i]), hash);
1507 this->hash = end_name_hash(hash);
1508
1509 return 0;
1510}
1511
1512static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1513{
1514 int i, result = 1;
1515
1516 if (a->len != b->len)
1517 goto out;
1518 for (i=0; i < a->len; i++) {
1519 if (tolower(a->name[i]) != tolower(b->name[i]))
1520 goto out;
1521 }
1522 result = 0;
1523
1524 /*
1525 * We want creates to preserve case. A negative dentry, a, that
1526 * has a different case than b may cause a new entry to be created
1527 * with the wrong case. Since we can't tell if a comes from a negative
1528 * dentry, we blindly replace it with b. This should be harmless if
1529 * a is not a negative dentry.
1530 */
1531 memcpy((unsigned char *)a->name, b->name, a->len);
1532out:
1533 return result;
1534}
1535
1536struct dentry_operations jfs_ci_dentry_operations =
1537{
1538 .d_hash = jfs_ci_hash,
1539 .d_compare = jfs_ci_compare,
1540};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 08:26:52 -0500