1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
5 */
6
7 #include <linux/fs.h>
8 #include <linux/namei.h>
9 #include <linux/ctype.h>
10 #include <linux/quotaops.h>
11 #include <linux/exportfs.h>
12 #include "jfs_incore.h"
13 #include "jfs_superblock.h"
14 #include "jfs_inode.h"
15 #include "jfs_dinode.h"
16 #include "jfs_dmap.h"
17 #include "jfs_unicode.h"
18 #include "jfs_metapage.h"
19 #include "jfs_xattr.h"
20 #include "jfs_acl.h"
21 #include "jfs_debug.h"
22
23 /*
24 * forward references
25 */
26 const struct dentry_operations jfs_ci_dentry_operations;
27
28 static s64 commitZeroLink(tid_t, struct inode *);
29
30 /*
31 * NAME: free_ea_wmap(inode)
32 *
33 * FUNCTION: free uncommitted extended attributes from working map
34 *
35 */
free_ea_wmap(struct inode * inode)36 static inline void free_ea_wmap(struct inode *inode)
37 {
38 dxd_t *ea = &JFS_IP(inode)->ea;
39
40 if (ea->flag & DXD_EXTENT) {
41 /* free EA pages from cache */
42 invalidate_dxd_metapages(inode, *ea);
43 dbFree(inode, addressDXD(ea), lengthDXD(ea));
44 }
45 ea->flag = 0;
46 }
47
48 /*
49 * NAME: jfs_create(dip, dentry, mode)
50 *
51 * FUNCTION: create a regular file in the parent directory <dip>
52 * with name = <from dentry> and mode = <mode>
53 *
54 * PARAMETER: dip - parent directory vnode
55 * dentry - dentry of new file
56 * mode - create mode (rwxrwxrwx).
57 * nd- nd struct
58 *
59 * RETURN: Errors from subroutines
60 *
61 */
jfs_create(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,umode_t mode,bool excl)62 static int jfs_create(struct mnt_idmap *idmap, struct inode *dip,
63 struct dentry *dentry, umode_t mode, bool excl)
64 {
65 int rc = 0;
66 tid_t tid; /* transaction id */
67 struct inode *ip = NULL; /* child directory inode */
68 ino_t ino;
69 struct component_name dname; /* child directory name */
70 struct btstack btstack;
71 struct inode *iplist[2];
72 struct tblock *tblk;
73
74 jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
75
76 rc = dquot_initialize(dip);
77 if (rc)
78 goto out1;
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 (IS_ERR(ip)) {
94 rc = PTR_ERR(ip);
95 goto out2;
96 }
97
98 tid = txBegin(dip->i_sb, 0);
99
100 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
101 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
102
103 rc = jfs_init_acl(tid, ip, dip);
104 if (rc)
105 goto out3;
106
107 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
108 if (rc) {
109 txAbort(tid, 0);
110 goto out3;
111 }
112
113 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
114 jfs_err("jfs_create: dtSearch returned %d", rc);
115 txAbort(tid, 0);
116 goto out3;
117 }
118
119 tblk = tid_to_tblock(tid);
120 tblk->xflag |= COMMIT_CREATE;
121 tblk->ino = ip->i_ino;
122 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
123
124 iplist[0] = dip;
125 iplist[1] = ip;
126
127 /*
128 * initialize the child XAD tree root in-line in inode
129 */
130 xtInitRoot(tid, ip);
131
132 /*
133 * create entry in parent directory for child directory
134 * (dtInsert() releases parent directory page)
135 */
136 ino = ip->i_ino;
137 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
138 if (rc == -EIO) {
139 jfs_err("jfs_create: dtInsert returned -EIO");
140 txAbort(tid, 1); /* Marks Filesystem dirty */
141 } else
142 txAbort(tid, 0); /* Filesystem full */
143 goto out3;
144 }
145
146 ip->i_op = &jfs_file_inode_operations;
147 ip->i_fop = &jfs_file_operations;
148 ip->i_mapping->a_ops = &jfs_aops;
149
150 mark_inode_dirty(ip);
151
152 dip->i_mtime = inode_set_ctime_current(dip);
153
154 mark_inode_dirty(dip);
155
156 rc = txCommit(tid, 2, &iplist[0], 0);
157
158 out3:
159 txEnd(tid);
160 mutex_unlock(&JFS_IP(ip)->commit_mutex);
161 mutex_unlock(&JFS_IP(dip)->commit_mutex);
162 if (rc) {
163 free_ea_wmap(ip);
164 clear_nlink(ip);
165 discard_new_inode(ip);
166 } else {
167 d_instantiate_new(dentry, ip);
168 }
169
170 out2:
171 free_UCSname(&dname);
172
173 out1:
174
175 jfs_info("jfs_create: rc:%d", rc);
176 return rc;
177 }
178
179
180 /*
181 * NAME: jfs_mkdir(dip, dentry, mode)
182 *
183 * FUNCTION: create a child directory in the parent directory <dip>
184 * with name = <from dentry> and mode = <mode>
185 *
186 * PARAMETER: dip - parent directory vnode
187 * dentry - dentry of child directory
188 * mode - create mode (rwxrwxrwx).
189 *
190 * RETURN: Errors from subroutines
191 *
192 * note:
193 * EACCES: user needs search+write permission on the parent directory
194 */
jfs_mkdir(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,umode_t mode)195 static int jfs_mkdir(struct mnt_idmap *idmap, struct inode *dip,
196 struct dentry *dentry, umode_t mode)
197 {
198 int rc = 0;
199 tid_t tid; /* transaction id */
200 struct inode *ip = NULL; /* child directory inode */
201 ino_t ino;
202 struct component_name dname; /* child directory name */
203 struct btstack btstack;
204 struct inode *iplist[2];
205 struct tblock *tblk;
206
207 jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
208
209 rc = dquot_initialize(dip);
210 if (rc)
211 goto out1;
212
213 /*
214 * search parent directory for entry/freespace
215 * (dtSearch() returns parent directory page pinned)
216 */
217 if ((rc = get_UCSname(&dname, dentry)))
218 goto out1;
219
220 /*
221 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
222 * block there while holding dtree page, so we allocate the inode &
223 * begin the transaction before we search the directory.
224 */
225 ip = ialloc(dip, S_IFDIR | mode);
226 if (IS_ERR(ip)) {
227 rc = PTR_ERR(ip);
228 goto out2;
229 }
230
231 tid = txBegin(dip->i_sb, 0);
232
233 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
234 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
235
236 rc = jfs_init_acl(tid, ip, dip);
237 if (rc)
238 goto out3;
239
240 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
241 if (rc) {
242 txAbort(tid, 0);
243 goto out3;
244 }
245
246 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
247 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
248 txAbort(tid, 0);
249 goto out3;
250 }
251
252 tblk = tid_to_tblock(tid);
253 tblk->xflag |= COMMIT_CREATE;
254 tblk->ino = ip->i_ino;
255 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
256
257 iplist[0] = dip;
258 iplist[1] = ip;
259
260 /*
261 * initialize the child directory in-line in inode
262 */
263 dtInitRoot(tid, ip, dip->i_ino);
264
265 /*
266 * create entry in parent directory for child directory
267 * (dtInsert() releases parent directory page)
268 */
269 ino = ip->i_ino;
270 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
271 if (rc == -EIO) {
272 jfs_err("jfs_mkdir: dtInsert returned -EIO");
273 txAbort(tid, 1); /* Marks Filesystem dirty */
274 } else
275 txAbort(tid, 0); /* Filesystem full */
276 goto out3;
277 }
278
279 set_nlink(ip, 2); /* for '.' */
280 ip->i_op = &jfs_dir_inode_operations;
281 ip->i_fop = &jfs_dir_operations;
282
283 mark_inode_dirty(ip);
284
285 /* update parent directory inode */
286 inc_nlink(dip); /* for '..' from child directory */
287 dip->i_mtime = inode_set_ctime_current(dip);
288 mark_inode_dirty(dip);
289
290 rc = txCommit(tid, 2, &iplist[0], 0);
291
292 out3:
293 txEnd(tid);
294 mutex_unlock(&JFS_IP(ip)->commit_mutex);
295 mutex_unlock(&JFS_IP(dip)->commit_mutex);
296 if (rc) {
297 free_ea_wmap(ip);
298 clear_nlink(ip);
299 discard_new_inode(ip);
300 } else {
301 d_instantiate_new(dentry, ip);
302 }
303
304 out2:
305 free_UCSname(&dname);
306
307
308 out1:
309
310 jfs_info("jfs_mkdir: rc:%d", rc);
311 return rc;
312 }
313
314 /*
315 * NAME: jfs_rmdir(dip, dentry)
316 *
317 * FUNCTION: remove a link to child directory
318 *
319 * PARAMETER: dip - parent inode
320 * dentry - child directory dentry
321 *
322 * RETURN: -EINVAL - if name is . or ..
323 * -EINVAL - if . or .. exist but are invalid.
324 * errors from subroutines
325 *
326 * note:
327 * if other threads have the directory open when the last link
328 * is removed, the "." and ".." entries, if present, are removed before
329 * rmdir() returns and no new entries may be created in the directory,
330 * but the directory is not removed until the last reference to
331 * the directory is released (cf.unlink() of regular file).
332 */
jfs_rmdir(struct inode * dip,struct dentry * dentry)333 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
334 {
335 int rc;
336 tid_t tid; /* transaction id */
337 struct inode *ip = d_inode(dentry);
338 ino_t ino;
339 struct component_name dname;
340 struct inode *iplist[2];
341 struct tblock *tblk;
342
343 jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
344
345 /* Init inode for quota operations. */
346 rc = dquot_initialize(dip);
347 if (rc)
348 goto out;
349 rc = dquot_initialize(ip);
350 if (rc)
351 goto out;
352
353 /* directory must be empty to be removed */
354 if (!dtEmpty(ip)) {
355 rc = -ENOTEMPTY;
356 goto out;
357 }
358
359 if ((rc = get_UCSname(&dname, dentry))) {
360 goto out;
361 }
362
363 tid = txBegin(dip->i_sb, 0);
364
365 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
366 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
367
368 iplist[0] = dip;
369 iplist[1] = ip;
370
371 tblk = tid_to_tblock(tid);
372 tblk->xflag |= COMMIT_DELETE;
373 tblk->u.ip = ip;
374
375 /*
376 * delete the entry of target directory from parent directory
377 */
378 ino = ip->i_ino;
379 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
380 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
381 if (rc == -EIO)
382 txAbort(tid, 1);
383 txEnd(tid);
384 mutex_unlock(&JFS_IP(ip)->commit_mutex);
385 mutex_unlock(&JFS_IP(dip)->commit_mutex);
386
387 goto out2;
388 }
389
390 /* update parent directory's link count corresponding
391 * to ".." entry of the target directory deleted
392 */
393 dip->i_mtime = inode_set_ctime_current(dip);
394 inode_dec_link_count(dip);
395
396 /*
397 * OS/2 could have created EA and/or ACL
398 */
399 /* free EA from both persistent and working map */
400 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
401 /* free EA pages */
402 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
403 }
404 JFS_IP(ip)->ea.flag = 0;
405
406 /* free ACL from both persistent and working map */
407 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
408 /* free ACL pages */
409 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
410 }
411 JFS_IP(ip)->acl.flag = 0;
412
413 /* mark the target directory as deleted */
414 clear_nlink(ip);
415 mark_inode_dirty(ip);
416
417 rc = txCommit(tid, 2, &iplist[0], 0);
418
419 txEnd(tid);
420
421 mutex_unlock(&JFS_IP(ip)->commit_mutex);
422 mutex_unlock(&JFS_IP(dip)->commit_mutex);
423
424 /*
425 * Truncating the directory index table is not guaranteed. It
426 * may need to be done iteratively
427 */
428 if (test_cflag(COMMIT_Stale, dip)) {
429 if (dip->i_size > 1)
430 jfs_truncate_nolock(dip, 0);
431
432 clear_cflag(COMMIT_Stale, dip);
433 }
434
435 out2:
436 free_UCSname(&dname);
437
438 out:
439 jfs_info("jfs_rmdir: rc:%d", rc);
440 return rc;
441 }
442
443 /*
444 * NAME: jfs_unlink(dip, dentry)
445 *
446 * FUNCTION: remove a link to object <vp> named by <name>
447 * from parent directory <dvp>
448 *
449 * PARAMETER: dip - inode of parent directory
450 * dentry - dentry of object to be removed
451 *
452 * RETURN: errors from subroutines
453 *
454 * note:
455 * temporary file: if one or more processes have the file open
456 * when the last link is removed, the link will be removed before
457 * unlink() returns, but the removal of the file contents will be
458 * postponed until all references to the files are closed.
459 *
460 * JFS does NOT support unlink() on directories.
461 *
462 */
jfs_unlink(struct inode * dip,struct dentry * dentry)463 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
464 {
465 int rc;
466 tid_t tid; /* transaction id */
467 struct inode *ip = d_inode(dentry);
468 ino_t ino;
469 struct component_name dname; /* object name */
470 struct inode *iplist[2];
471 struct tblock *tblk;
472 s64 new_size = 0;
473 int commit_flag;
474
475 jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
476
477 /* Init inode for quota operations. */
478 rc = dquot_initialize(dip);
479 if (rc)
480 goto out;
481 rc = dquot_initialize(ip);
482 if (rc)
483 goto out;
484
485 if ((rc = get_UCSname(&dname, dentry)))
486 goto out;
487
488 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
489
490 tid = txBegin(dip->i_sb, 0);
491
492 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
493 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
494
495 iplist[0] = dip;
496 iplist[1] = ip;
497
498 /*
499 * delete the entry of target file from parent directory
500 */
501 ino = ip->i_ino;
502 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
503 jfs_err("jfs_unlink: dtDelete returned %d", rc);
504 if (rc == -EIO)
505 txAbort(tid, 1); /* Marks FS Dirty */
506 txEnd(tid);
507 mutex_unlock(&JFS_IP(ip)->commit_mutex);
508 mutex_unlock(&JFS_IP(dip)->commit_mutex);
509 IWRITE_UNLOCK(ip);
510 goto out1;
511 }
512
513 ASSERT(ip->i_nlink);
514
515 dip->i_mtime = inode_set_ctime_to_ts(dip, inode_set_ctime_current(ip));
516 mark_inode_dirty(dip);
517
518 /* update target's inode */
519 inode_dec_link_count(ip);
520
521 /*
522 * commit zero link count object
523 */
524 if (ip->i_nlink == 0) {
525 assert(!test_cflag(COMMIT_Nolink, ip));
526 /* free block resources */
527 if ((new_size = commitZeroLink(tid, ip)) < 0) {
528 txAbort(tid, 1); /* Marks FS Dirty */
529 txEnd(tid);
530 mutex_unlock(&JFS_IP(ip)->commit_mutex);
531 mutex_unlock(&JFS_IP(dip)->commit_mutex);
532 IWRITE_UNLOCK(ip);
533 rc = new_size;
534 goto out1;
535 }
536 tblk = tid_to_tblock(tid);
537 tblk->xflag |= COMMIT_DELETE;
538 tblk->u.ip = ip;
539 }
540
541 /*
542 * Incomplete truncate of file data can
543 * result in timing problems unless we synchronously commit the
544 * transaction.
545 */
546 if (new_size)
547 commit_flag = COMMIT_SYNC;
548 else
549 commit_flag = 0;
550
551 /*
552 * If xtTruncate was incomplete, commit synchronously to avoid
553 * timing complications
554 */
555 rc = txCommit(tid, 2, &iplist[0], commit_flag);
556
557 txEnd(tid);
558
559 mutex_unlock(&JFS_IP(ip)->commit_mutex);
560 mutex_unlock(&JFS_IP(dip)->commit_mutex);
561
562 while (new_size && (rc == 0)) {
563 tid = txBegin(dip->i_sb, 0);
564 mutex_lock(&JFS_IP(ip)->commit_mutex);
565 new_size = xtTruncate_pmap(tid, ip, new_size);
566 if (new_size < 0) {
567 txAbort(tid, 1); /* Marks FS Dirty */
568 rc = new_size;
569 } else
570 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
571 txEnd(tid);
572 mutex_unlock(&JFS_IP(ip)->commit_mutex);
573 }
574
575 if (ip->i_nlink == 0)
576 set_cflag(COMMIT_Nolink, ip);
577
578 IWRITE_UNLOCK(ip);
579
580 /*
581 * Truncating the directory index table is not guaranteed. It
582 * may need to be done iteratively
583 */
584 if (test_cflag(COMMIT_Stale, dip)) {
585 if (dip->i_size > 1)
586 jfs_truncate_nolock(dip, 0);
587
588 clear_cflag(COMMIT_Stale, dip);
589 }
590
591 out1:
592 free_UCSname(&dname);
593 out:
594 jfs_info("jfs_unlink: rc:%d", rc);
595 return rc;
596 }
597
598 /*
599 * NAME: commitZeroLink()
600 *
601 * FUNCTION: for non-directory, called by jfs_remove(),
602 * truncate a regular file, directory or symbolic
603 * link to zero length. return 0 if type is not
604 * one of these.
605 *
606 * if the file is currently associated with a VM segment
607 * only permanent disk and inode map resources are freed,
608 * and neither the inode nor indirect blocks are modified
609 * so that the resources can be later freed in the work
610 * map by ctrunc1.
611 * if there is no VM segment on entry, the resources are
612 * freed in both work and permanent map.
613 * (? for temporary file - memory object is cached even
614 * after no reference:
615 * reference count > 0 - )
616 *
617 * PARAMETERS: cd - pointer to commit data structure.
618 * current inode is the one to truncate.
619 *
620 * RETURN: Errors from subroutines
621 */
commitZeroLink(tid_t tid,struct inode * ip)622 static s64 commitZeroLink(tid_t tid, struct inode *ip)
623 {
624 int filetype;
625 struct tblock *tblk;
626
627 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
628
629 filetype = ip->i_mode & S_IFMT;
630 switch (filetype) {
631 case S_IFREG:
632 break;
633 case S_IFLNK:
634 /* fast symbolic link */
635 if (ip->i_size < IDATASIZE) {
636 ip->i_size = 0;
637 return 0;
638 }
639 break;
640 default:
641 assert(filetype != S_IFDIR);
642 return 0;
643 }
644
645 set_cflag(COMMIT_Freewmap, ip);
646
647 /* mark transaction of block map update type */
648 tblk = tid_to_tblock(tid);
649 tblk->xflag |= COMMIT_PMAP;
650
651 /*
652 * free EA
653 */
654 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
655 /* acquire maplock on EA to be freed from block map */
656 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
657
658 /*
659 * free ACL
660 */
661 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
662 /* acquire maplock on EA to be freed from block map */
663 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
664
665 /*
666 * free xtree/data (truncate to zero length):
667 * free xtree/data pages from cache if COMMIT_PWMAP,
668 * free xtree/data blocks from persistent block map, and
669 * free xtree/data blocks from working block map if COMMIT_PWMAP;
670 */
671 if (ip->i_size)
672 return xtTruncate_pmap(tid, ip, 0);
673
674 return 0;
675 }
676
677
678 /*
679 * NAME: jfs_free_zero_link()
680 *
681 * FUNCTION: for non-directory, called by iClose(),
682 * free resources of a file from cache and WORKING map
683 * for a file previously committed with zero link count
684 * while associated with a pager object,
685 *
686 * PARAMETER: ip - pointer to inode of file.
687 */
jfs_free_zero_link(struct inode * ip)688 void jfs_free_zero_link(struct inode *ip)
689 {
690 int type;
691
692 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
693
694 /* return if not reg or symbolic link or if size is
695 * already ok.
696 */
697 type = ip->i_mode & S_IFMT;
698
699 switch (type) {
700 case S_IFREG:
701 break;
702 case S_IFLNK:
703 /* if its contained in inode nothing to do */
704 if (ip->i_size < IDATASIZE)
705 return;
706 break;
707 default:
708 return;
709 }
710
711 /*
712 * free EA
713 */
714 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
715 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
716 int xlen = lengthDXD(&JFS_IP(ip)->ea);
717 struct maplock maplock; /* maplock for COMMIT_WMAP */
718 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
719
720 /* free EA pages from cache */
721 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
722
723 /* free EA extent from working block map */
724 maplock.index = 1;
725 pxdlock = (struct pxd_lock *) & maplock;
726 pxdlock->flag = mlckFREEPXD;
727 PXDaddress(&pxdlock->pxd, xaddr);
728 PXDlength(&pxdlock->pxd, xlen);
729 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
730 }
731
732 /*
733 * free ACL
734 */
735 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
736 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
737 int xlen = lengthDXD(&JFS_IP(ip)->acl);
738 struct maplock maplock; /* maplock for COMMIT_WMAP */
739 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
740
741 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
742
743 /* free ACL extent from working block map */
744 maplock.index = 1;
745 pxdlock = (struct pxd_lock *) & maplock;
746 pxdlock->flag = mlckFREEPXD;
747 PXDaddress(&pxdlock->pxd, xaddr);
748 PXDlength(&pxdlock->pxd, xlen);
749 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
750 }
751
752 /*
753 * free xtree/data (truncate to zero length):
754 * free xtree/data pages from cache, and
755 * free xtree/data blocks from working block map;
756 */
757 if (ip->i_size)
758 xtTruncate(0, ip, 0, COMMIT_WMAP);
759 }
760
761 /*
762 * NAME: jfs_link(vp, dvp, name, crp)
763 *
764 * FUNCTION: create a link to <vp> by the name = <name>
765 * in the parent directory <dvp>
766 *
767 * PARAMETER: vp - target object
768 * dvp - parent directory of new link
769 * name - name of new link to target object
770 * crp - credential
771 *
772 * RETURN: Errors from subroutines
773 *
774 * note:
775 * JFS does NOT support link() on directories (to prevent circular
776 * path in the directory hierarchy);
777 * EPERM: the target object is a directory, and either the caller
778 * does not have appropriate privileges or the implementation prohibits
779 * using link() on directories [XPG4.2].
780 *
781 * JFS does NOT support links between file systems:
782 * EXDEV: target object and new link are on different file systems and
783 * implementation does not support links between file systems [XPG4.2].
784 */
jfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)785 static int jfs_link(struct dentry *old_dentry,
786 struct inode *dir, struct dentry *dentry)
787 {
788 int rc;
789 tid_t tid;
790 struct inode *ip = d_inode(old_dentry);
791 ino_t ino;
792 struct component_name dname;
793 struct btstack btstack;
794 struct inode *iplist[2];
795
796 jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
797
798 rc = dquot_initialize(dir);
799 if (rc)
800 goto out;
801
802 if (isReadOnly(ip)) {
803 jfs_error(ip->i_sb, "read-only filesystem\n");
804 return -EROFS;
805 }
806
807 tid = txBegin(ip->i_sb, 0);
808
809 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
810 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
811
812 /*
813 * scan parent directory for entry/freespace
814 */
815 if ((rc = get_UCSname(&dname, dentry)))
816 goto out_tx;
817
818 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
819 goto free_dname;
820
821 /*
822 * create entry for new link in parent directory
823 */
824 ino = ip->i_ino;
825 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
826 goto free_dname;
827
828 /* update object inode */
829 inc_nlink(ip); /* for new link */
830 inode_set_ctime_current(ip);
831 dir->i_mtime = inode_set_ctime_current(dir);
832 mark_inode_dirty(dir);
833 ihold(ip);
834
835 iplist[0] = ip;
836 iplist[1] = dir;
837 rc = txCommit(tid, 2, &iplist[0], 0);
838
839 if (rc) {
840 drop_nlink(ip); /* never instantiated */
841 iput(ip);
842 } else
843 d_instantiate(dentry, ip);
844
845 free_dname:
846 free_UCSname(&dname);
847
848 out_tx:
849 txEnd(tid);
850
851 mutex_unlock(&JFS_IP(ip)->commit_mutex);
852 mutex_unlock(&JFS_IP(dir)->commit_mutex);
853
854 out:
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
jfs_symlink(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,const char * name)877 static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
878 struct dentry *dentry, const char *name)
879 {
880 int rc;
881 tid_t tid;
882 ino_t ino = 0;
883 struct component_name dname;
884 u32 ssize; /* source pathname size */
885 struct btstack btstack;
886 struct inode *ip;
887 s64 xlen = 0;
888 int bmask = 0, xsize;
889 s64 xaddr;
890 struct metapage *mp;
891 struct super_block *sb;
892 struct tblock *tblk;
893
894 struct inode *iplist[2];
895
896 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
897
898 rc = dquot_initialize(dip);
899 if (rc)
900 goto out1;
901
902 ssize = strlen(name) + 1;
903
904 /*
905 * search parent directory for entry/freespace
906 * (dtSearch() returns parent directory page pinned)
907 */
908
909 if ((rc = get_UCSname(&dname, dentry)))
910 goto out1;
911
912 /*
913 * allocate on-disk/in-memory inode for symbolic link:
914 * (iAlloc() returns new, locked inode)
915 */
916 ip = ialloc(dip, S_IFLNK | 0777);
917 if (IS_ERR(ip)) {
918 rc = PTR_ERR(ip);
919 goto out2;
920 }
921
922 tid = txBegin(dip->i_sb, 0);
923
924 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
925 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
926
927 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
928 if (rc)
929 goto out3;
930
931 tblk = tid_to_tblock(tid);
932 tblk->xflag |= COMMIT_CREATE;
933 tblk->ino = ip->i_ino;
934 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
935
936 /* fix symlink access permission
937 * (dir_create() ANDs in the u.u_cmask,
938 * but symlinks really need to be 777 access)
939 */
940 ip->i_mode |= 0777;
941
942 /*
943 * write symbolic link target path name
944 */
945 xtInitRoot(tid, ip);
946
947 /*
948 * write source path name inline in on-disk inode (fast symbolic link)
949 */
950
951 if (ssize <= IDATASIZE) {
952 ip->i_op = &jfs_fast_symlink_inode_operations;
953
954 ip->i_link = JFS_IP(ip)->i_inline_all;
955 memcpy(ip->i_link, name, ssize);
956 ip->i_size = ssize - 1;
957
958 /*
959 * if symlink is > 128 bytes, we don't have the space to
960 * store inline extended attributes
961 */
962 if (ssize > sizeof (JFS_IP(ip)->i_inline))
963 JFS_IP(ip)->mode2 &= ~INLINEEA;
964
965 jfs_info("jfs_symlink: fast symlink added ssize:%u name:%s ",
966 ssize, name);
967 }
968 /*
969 * write source path name in a single extent
970 */
971 else {
972 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
973
974 ip->i_op = &jfs_symlink_inode_operations;
975 inode_nohighmem(ip);
976 ip->i_mapping->a_ops = &jfs_aops;
977
978 /*
979 * even though the data of symlink object (source
980 * path name) is treated as non-journaled user data,
981 * it is read/written thru buffer cache for performance.
982 */
983 sb = ip->i_sb;
984 bmask = JFS_SBI(sb)->bsize - 1;
985 xsize = (ssize + bmask) & ~bmask;
986 xaddr = 0;
987 xlen = xsize >> JFS_SBI(sb)->l2bsize;
988 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
989 txAbort(tid, 0);
990 goto out3;
991 }
992 ip->i_size = ssize - 1;
993 while (ssize) {
994 /* This is kind of silly since PATH_MAX == 4K */
995 u32 copy_size = min_t(u32, ssize, PSIZE);
996
997 mp = get_metapage(ip, xaddr, PSIZE, 1);
998
999 if (mp == NULL) {
1000 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1001 rc = -EIO;
1002 txAbort(tid, 0);
1003 goto out3;
1004 }
1005 memcpy(mp->data, name, copy_size);
1006 flush_metapage(mp);
1007 ssize -= copy_size;
1008 name += copy_size;
1009 xaddr += JFS_SBI(sb)->nbperpage;
1010 }
1011 }
1012
1013 /*
1014 * create entry for symbolic link in parent directory
1015 */
1016 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1017 if (rc == 0) {
1018 ino = ip->i_ino;
1019 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1020 }
1021 if (rc) {
1022 if (xlen)
1023 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1024 txAbort(tid, 0);
1025 /* discard new inode */
1026 goto out3;
1027 }
1028
1029 mark_inode_dirty(ip);
1030
1031 dip->i_mtime = inode_set_ctime_current(dip);
1032 mark_inode_dirty(dip);
1033 /*
1034 * commit update of parent directory and link object
1035 */
1036
1037 iplist[0] = dip;
1038 iplist[1] = ip;
1039 rc = txCommit(tid, 2, &iplist[0], 0);
1040
1041 out3:
1042 txEnd(tid);
1043 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1044 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1045 if (rc) {
1046 free_ea_wmap(ip);
1047 clear_nlink(ip);
1048 discard_new_inode(ip);
1049 } else {
1050 d_instantiate_new(dentry, ip);
1051 }
1052
1053 out2:
1054 free_UCSname(&dname);
1055
1056 out1:
1057 jfs_info("jfs_symlink: rc:%d", rc);
1058 return rc;
1059 }
1060
1061
1062 /*
1063 * NAME: jfs_rename
1064 *
1065 * FUNCTION: rename a file or directory
1066 */
jfs_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1067 static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
1068 struct dentry *old_dentry, struct inode *new_dir,
1069 struct dentry *new_dentry, unsigned int flags)
1070 {
1071 struct btstack btstack;
1072 ino_t ino;
1073 struct component_name new_dname;
1074 struct inode *new_ip;
1075 struct component_name old_dname;
1076 struct inode *old_ip;
1077 int rc;
1078 tid_t tid;
1079 struct tlock *tlck;
1080 struct dt_lock *dtlck;
1081 struct lv *lv;
1082 int ipcount;
1083 struct inode *iplist[4];
1084 struct tblock *tblk;
1085 s64 new_size = 0;
1086 int commit_flag;
1087
1088 if (flags & ~RENAME_NOREPLACE)
1089 return -EINVAL;
1090
1091 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1092
1093 rc = dquot_initialize(old_dir);
1094 if (rc)
1095 goto out1;
1096 rc = dquot_initialize(new_dir);
1097 if (rc)
1098 goto out1;
1099
1100 old_ip = d_inode(old_dentry);
1101 new_ip = d_inode(new_dentry);
1102
1103 if ((rc = get_UCSname(&old_dname, old_dentry)))
1104 goto out1;
1105
1106 if ((rc = get_UCSname(&new_dname, new_dentry)))
1107 goto out2;
1108
1109 /*
1110 * Make sure source inode number is what we think it is
1111 */
1112 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1113 if (rc || (ino != old_ip->i_ino)) {
1114 rc = -ENOENT;
1115 goto out3;
1116 }
1117
1118 /*
1119 * Make sure dest inode number (if any) is what we think it is
1120 */
1121 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1122 if (!rc) {
1123 if ((!new_ip) || (ino != new_ip->i_ino)) {
1124 rc = -ESTALE;
1125 goto out3;
1126 }
1127 } else if (rc != -ENOENT)
1128 goto out3;
1129 else if (new_ip) {
1130 /* no entry exists, but one was expected */
1131 rc = -ESTALE;
1132 goto out3;
1133 }
1134
1135 if (S_ISDIR(old_ip->i_mode)) {
1136 if (new_ip) {
1137 if (!dtEmpty(new_ip)) {
1138 rc = -ENOTEMPTY;
1139 goto out3;
1140 }
1141 }
1142 } else if (new_ip) {
1143 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1144 /* Init inode for quota operations. */
1145 rc = dquot_initialize(new_ip);
1146 if (rc)
1147 goto out_unlock;
1148 }
1149
1150 /*
1151 * The real work starts here
1152 */
1153 tid = txBegin(new_dir->i_sb, 0);
1154
1155 /*
1156 * How do we know the locking is safe from deadlocks?
1157 * The vfs does the hard part for us. Any time we are taking nested
1158 * commit_mutexes, the vfs already has i_mutex held on the parent.
1159 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1160 */
1161 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1162 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1163 if (old_dir != new_dir)
1164 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1165 COMMIT_MUTEX_SECOND_PARENT);
1166
1167 if (new_ip) {
1168 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1169 COMMIT_MUTEX_VICTIM);
1170 /*
1171 * Change existing directory entry to new inode number
1172 */
1173 ino = new_ip->i_ino;
1174 rc = dtModify(tid, new_dir, &new_dname, &ino,
1175 old_ip->i_ino, JFS_RENAME);
1176 if (rc)
1177 goto out_tx;
1178 drop_nlink(new_ip);
1179 if (S_ISDIR(new_ip->i_mode)) {
1180 drop_nlink(new_ip);
1181 if (new_ip->i_nlink) {
1182 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1183 if (old_dir != new_dir)
1184 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1185 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1186 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1187 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1188 IWRITE_UNLOCK(new_ip);
1189 jfs_error(new_ip->i_sb,
1190 "new_ip->i_nlink != 0\n");
1191 return -EIO;
1192 }
1193 tblk = tid_to_tblock(tid);
1194 tblk->xflag |= COMMIT_DELETE;
1195 tblk->u.ip = new_ip;
1196 } else if (new_ip->i_nlink == 0) {
1197 assert(!test_cflag(COMMIT_Nolink, new_ip));
1198 /* free block resources */
1199 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1200 txAbort(tid, 1); /* Marks FS Dirty */
1201 rc = new_size;
1202 goto out_tx;
1203 }
1204 tblk = tid_to_tblock(tid);
1205 tblk->xflag |= COMMIT_DELETE;
1206 tblk->u.ip = new_ip;
1207 } else {
1208 inode_set_ctime_current(new_ip);
1209 mark_inode_dirty(new_ip);
1210 }
1211 } else {
1212 /*
1213 * Add new directory entry
1214 */
1215 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1216 JFS_CREATE);
1217 if (rc) {
1218 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1219 rc);
1220 goto out_tx;
1221 }
1222
1223 ino = old_ip->i_ino;
1224 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1225 if (rc) {
1226 if (rc == -EIO)
1227 jfs_err("jfs_rename: dtInsert returned -EIO");
1228 goto out_tx;
1229 }
1230 if (S_ISDIR(old_ip->i_mode))
1231 inc_nlink(new_dir);
1232 }
1233 /*
1234 * Remove old directory entry
1235 */
1236
1237 ino = old_ip->i_ino;
1238 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1239 if (rc) {
1240 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1241 rc);
1242 txAbort(tid, 1); /* Marks Filesystem dirty */
1243 goto out_tx;
1244 }
1245 if (S_ISDIR(old_ip->i_mode)) {
1246 drop_nlink(old_dir);
1247 if (old_dir != new_dir) {
1248 /*
1249 * Change inode number of parent for moved directory
1250 */
1251
1252 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1253 cpu_to_le32(new_dir->i_ino);
1254
1255 /* Linelock header of dtree */
1256 tlck = txLock(tid, old_ip,
1257 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1258 tlckDTREE | tlckBTROOT | tlckRELINK);
1259 dtlck = (struct dt_lock *) & tlck->lock;
1260 ASSERT(dtlck->index == 0);
1261 lv = & dtlck->lv[0];
1262 lv->offset = 0;
1263 lv->length = 1;
1264 dtlck->index++;
1265 }
1266 }
1267
1268 /*
1269 * Update ctime on changed/moved inodes & mark dirty
1270 */
1271 inode_set_ctime_current(old_ip);
1272 mark_inode_dirty(old_ip);
1273
1274 new_dir->i_mtime = inode_set_ctime_current(new_dir);
1275 mark_inode_dirty(new_dir);
1276
1277 /* Build list of inodes modified by this transaction */
1278 ipcount = 0;
1279 iplist[ipcount++] = old_ip;
1280 if (new_ip)
1281 iplist[ipcount++] = new_ip;
1282 iplist[ipcount++] = old_dir;
1283
1284 if (old_dir != new_dir) {
1285 iplist[ipcount++] = new_dir;
1286 old_dir->i_mtime = inode_set_ctime_current(old_dir);
1287 mark_inode_dirty(old_dir);
1288 }
1289
1290 /*
1291 * Incomplete truncate of file data can
1292 * result in timing problems unless we synchronously commit the
1293 * transaction.
1294 */
1295 if (new_size)
1296 commit_flag = COMMIT_SYNC;
1297 else
1298 commit_flag = 0;
1299
1300 rc = txCommit(tid, ipcount, iplist, commit_flag);
1301
1302 out_tx:
1303 txEnd(tid);
1304 if (new_ip)
1305 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1306 if (old_dir != new_dir)
1307 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1308 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1309 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1310
1311 while (new_size && (rc == 0)) {
1312 tid = txBegin(new_ip->i_sb, 0);
1313 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1314 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1315 if (new_size < 0) {
1316 txAbort(tid, 1);
1317 rc = new_size;
1318 } else
1319 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1320 txEnd(tid);
1321 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1322 }
1323 if (new_ip && (new_ip->i_nlink == 0))
1324 set_cflag(COMMIT_Nolink, new_ip);
1325 /*
1326 * Truncating the directory index table is not guaranteed. It
1327 * may need to be done iteratively
1328 */
1329 if (test_cflag(COMMIT_Stale, old_dir)) {
1330 if (old_dir->i_size > 1)
1331 jfs_truncate_nolock(old_dir, 0);
1332
1333 clear_cflag(COMMIT_Stale, old_dir);
1334 }
1335 out_unlock:
1336 if (new_ip && !S_ISDIR(new_ip->i_mode))
1337 IWRITE_UNLOCK(new_ip);
1338 out3:
1339 free_UCSname(&new_dname);
1340 out2:
1341 free_UCSname(&old_dname);
1342 out1:
1343 jfs_info("jfs_rename: returning %d", rc);
1344 return rc;
1345 }
1346
1347
1348 /*
1349 * NAME: jfs_mknod
1350 *
1351 * FUNCTION: Create a special file (device)
1352 */
jfs_mknod(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)1353 static int jfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1354 struct dentry *dentry, umode_t mode, dev_t rdev)
1355 {
1356 struct jfs_inode_info *jfs_ip;
1357 struct btstack btstack;
1358 struct component_name dname;
1359 ino_t ino;
1360 struct inode *ip;
1361 struct inode *iplist[2];
1362 int rc;
1363 tid_t tid;
1364 struct tblock *tblk;
1365
1366 jfs_info("jfs_mknod: %pd", dentry);
1367
1368 rc = dquot_initialize(dir);
1369 if (rc)
1370 goto out;
1371
1372 if ((rc = get_UCSname(&dname, dentry)))
1373 goto out;
1374
1375 ip = ialloc(dir, mode);
1376 if (IS_ERR(ip)) {
1377 rc = PTR_ERR(ip);
1378 goto out1;
1379 }
1380 jfs_ip = JFS_IP(ip);
1381
1382 tid = txBegin(dir->i_sb, 0);
1383
1384 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1385 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1386
1387 rc = jfs_init_acl(tid, ip, dir);
1388 if (rc)
1389 goto out3;
1390
1391 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1392 if (rc) {
1393 txAbort(tid, 0);
1394 goto out3;
1395 }
1396
1397 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1398 txAbort(tid, 0);
1399 goto out3;
1400 }
1401
1402 tblk = tid_to_tblock(tid);
1403 tblk->xflag |= COMMIT_CREATE;
1404 tblk->ino = ip->i_ino;
1405 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1406
1407 ino = ip->i_ino;
1408 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1409 txAbort(tid, 0);
1410 goto out3;
1411 }
1412
1413 ip->i_op = &jfs_file_inode_operations;
1414 jfs_ip->dev = new_encode_dev(rdev);
1415 init_special_inode(ip, ip->i_mode, rdev);
1416
1417 mark_inode_dirty(ip);
1418
1419 dir->i_mtime = inode_set_ctime_current(dir);
1420
1421 mark_inode_dirty(dir);
1422
1423 iplist[0] = dir;
1424 iplist[1] = ip;
1425 rc = txCommit(tid, 2, iplist, 0);
1426
1427 out3:
1428 txEnd(tid);
1429 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1430 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1431 if (rc) {
1432 free_ea_wmap(ip);
1433 clear_nlink(ip);
1434 discard_new_inode(ip);
1435 } else {
1436 d_instantiate_new(dentry, ip);
1437 }
1438
1439 out1:
1440 free_UCSname(&dname);
1441
1442 out:
1443 jfs_info("jfs_mknod: returning %d", rc);
1444 return rc;
1445 }
1446
jfs_lookup(struct inode * dip,struct dentry * dentry,unsigned int flags)1447 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1448 {
1449 struct btstack btstack;
1450 ino_t inum;
1451 struct inode *ip;
1452 struct component_name key;
1453 int rc;
1454
1455 jfs_info("jfs_lookup: name = %pd", dentry);
1456
1457 if ((rc = get_UCSname(&key, dentry)))
1458 return ERR_PTR(rc);
1459 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1460 free_UCSname(&key);
1461 if (rc == -ENOENT) {
1462 ip = NULL;
1463 } else if (rc) {
1464 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1465 ip = ERR_PTR(rc);
1466 } else {
1467 ip = jfs_iget(dip->i_sb, inum);
1468 if (IS_ERR(ip))
1469 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1470 }
1471
1472 return d_splice_alias(ip, dentry);
1473 }
1474
jfs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)1475 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1476 u64 ino, u32 generation)
1477 {
1478 struct inode *inode;
1479
1480 if (ino == 0)
1481 return ERR_PTR(-ESTALE);
1482 inode = jfs_iget(sb, ino);
1483 if (IS_ERR(inode))
1484 return ERR_CAST(inode);
1485
1486 if (generation && inode->i_generation != generation) {
1487 iput(inode);
1488 return ERR_PTR(-ESTALE);
1489 }
1490
1491 return inode;
1492 }
1493
jfs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1494 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1495 int fh_len, int fh_type)
1496 {
1497 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1498 jfs_nfs_get_inode);
1499 }
1500
jfs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1501 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1502 int fh_len, int fh_type)
1503 {
1504 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1505 jfs_nfs_get_inode);
1506 }
1507
jfs_get_parent(struct dentry * dentry)1508 struct dentry *jfs_get_parent(struct dentry *dentry)
1509 {
1510 unsigned long parent_ino;
1511
1512 parent_ino =
1513 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1514
1515 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1516 }
1517
1518 const struct inode_operations jfs_dir_inode_operations = {
1519 .create = jfs_create,
1520 .lookup = jfs_lookup,
1521 .link = jfs_link,
1522 .unlink = jfs_unlink,
1523 .symlink = jfs_symlink,
1524 .mkdir = jfs_mkdir,
1525 .rmdir = jfs_rmdir,
1526 .mknod = jfs_mknod,
1527 .rename = jfs_rename,
1528 .listxattr = jfs_listxattr,
1529 .setattr = jfs_setattr,
1530 .fileattr_get = jfs_fileattr_get,
1531 .fileattr_set = jfs_fileattr_set,
1532 #ifdef CONFIG_JFS_POSIX_ACL
1533 .get_inode_acl = jfs_get_acl,
1534 .set_acl = jfs_set_acl,
1535 #endif
1536 };
1537
1538 WRAP_DIR_ITER(jfs_readdir) // FIXME!
1539 const struct file_operations jfs_dir_operations = {
1540 .read = generic_read_dir,
1541 .iterate_shared = shared_jfs_readdir,
1542 .fsync = jfs_fsync,
1543 .unlocked_ioctl = jfs_ioctl,
1544 .compat_ioctl = compat_ptr_ioctl,
1545 .llseek = generic_file_llseek,
1546 };
1547
jfs_ci_hash(const struct dentry * dir,struct qstr * this)1548 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1549 {
1550 unsigned long hash;
1551 int i;
1552
1553 hash = init_name_hash(dir);
1554 for (i=0; i < this->len; i++)
1555 hash = partial_name_hash(tolower(this->name[i]), hash);
1556 this->hash = end_name_hash(hash);
1557
1558 return 0;
1559 }
1560
jfs_ci_compare(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)1561 static int jfs_ci_compare(const struct dentry *dentry,
1562 unsigned int len, const char *str, const struct qstr *name)
1563 {
1564 int i, result = 1;
1565
1566 if (len != name->len)
1567 goto out;
1568 for (i=0; i < len; i++) {
1569 if (tolower(str[i]) != tolower(name->name[i]))
1570 goto out;
1571 }
1572 result = 0;
1573 out:
1574 return result;
1575 }
1576
jfs_ci_revalidate(struct dentry * dentry,unsigned int flags)1577 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1578 {
1579 /*
1580 * This is not negative dentry. Always valid.
1581 *
1582 * Note, rename() to existing directory entry will have ->d_inode,
1583 * and will use existing name which isn't specified name by user.
1584 *
1585 * We may be able to drop this positive dentry here. But dropping
1586 * positive dentry isn't good idea. So it's unsupported like
1587 * rename("filename", "FILENAME") for now.
1588 */
1589 if (d_really_is_positive(dentry))
1590 return 1;
1591
1592 /*
1593 * This may be nfsd (or something), anyway, we can't see the
1594 * intent of this. So, since this can be for creation, drop it.
1595 */
1596 if (!flags)
1597 return 0;
1598
1599 /*
1600 * Drop the negative dentry, in order to make sure to use the
1601 * case sensitive name which is specified by user if this is
1602 * for creation.
1603 */
1604 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1605 return 0;
1606 return 1;
1607 }
1608
1609 const struct dentry_operations jfs_ci_dentry_operations =
1610 {
1611 .d_hash = jfs_ci_hash,
1612 .d_compare = jfs_ci_compare,
1613 .d_revalidate = jfs_ci_revalidate,
1614 };
1615
