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 */
26const struct dentry_operations jfs_ci_dentry_operations;
27
28static 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 */
36static 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(ipbmap: 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 */
62static 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(inode: 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(ptr: ip)) {
94 rc = PTR_ERR(ptr: ip);
95 goto out2;
96 }
97
98 tid = txBegin(dip->i_sb, 0);
99
100 mutex_lock_nested(lock: &JFS_IP(inode: dip)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
101 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: 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(ip: dip, key: &dname, data: &ino, btstack: &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(inode: 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, ip: dip, key: &dname, ino: &ino, btstack: &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(inode: ip);
151
152 inode_set_mtime_to_ts(inode: dip, ts: inode_set_ctime_current(inode: dip));
153
154 mark_inode_dirty(inode: dip);
155
156 rc = txCommit(tid, 2, &iplist[0], 0);
157
158 out3:
159 txEnd(tid);
160 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
161 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
162 if (rc) {
163 free_ea_wmap(inode: ip);
164 clear_nlink(inode: 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: ERR_PTR() of errors from subroutines.
191 *
192 * note:
193 * EACCES: user needs search+write permission on the parent directory
194 */
195static struct dentry *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(inode: 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(ptr: ip)) {
227 rc = PTR_ERR(ptr: ip);
228 goto out2;
229 }
230
231 tid = txBegin(dip->i_sb, 0);
232
233 mutex_lock_nested(lock: &JFS_IP(inode: dip)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
234 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: 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(ip: dip, key: &dname, data: &ino, btstack: &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(inode: 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, idotdot: 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, ip: dip, key: &dname, ino: &ino, btstack: &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(inode: ip, nlink: 2); /* for '.' */
280 ip->i_op = &jfs_dir_inode_operations;
281 ip->i_fop = &jfs_dir_operations;
282
283 mark_inode_dirty(inode: ip);
284
285 /* update parent directory inode */
286 inc_nlink(inode: dip); /* for '..' from child directory */
287 inode_set_mtime_to_ts(inode: dip, ts: inode_set_ctime_current(inode: dip));
288 mark_inode_dirty(inode: dip);
289
290 rc = txCommit(tid, 2, &iplist[0], 0);
291
292 out3:
293 txEnd(tid);
294 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
295 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
296 if (rc) {
297 free_ea_wmap(inode: ip);
298 clear_nlink(inode: 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 ERR_PTR(error: 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 */
333static 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(inode: dip);
347 if (rc)
348 goto out;
349 rc = dquot_initialize(inode: 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(lock: &JFS_IP(inode: dip)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
366 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: 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, ip: dip, key: &dname, data: &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(lock: &JFS_IP(inode: ip)->commit_mutex);
385 mutex_unlock(lock: &JFS_IP(inode: 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 inode_set_mtime_to_ts(inode: dip, ts: inode_set_ctime_current(inode: dip));
394 inode_dec_link_count(inode: 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(inode: ip)->ea.flag & DXD_EXTENT) {
401 /* free EA pages */
402 txEA(tid, ip, &JFS_IP(inode: ip)->ea, NULL);
403 }
404 JFS_IP(inode: ip)->ea.flag = 0;
405
406 /* free ACL from both persistent and working map */
407 if (JFS_IP(inode: ip)->acl.flag & DXD_EXTENT) {
408 /* free ACL pages */
409 txEA(tid, ip, &JFS_IP(inode: ip)->acl, NULL);
410 }
411 JFS_IP(inode: ip)->acl.flag = 0;
412
413 /* mark the target directory as deleted */
414 clear_nlink(inode: ip);
415 mark_inode_dirty(inode: ip);
416
417 rc = txCommit(tid, 2, &iplist[0], 0);
418
419 txEnd(tid);
420
421 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
422 mutex_unlock(lock: &JFS_IP(inode: 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 */
463static 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(inode: dip);
479 if (rc)
480 goto out;
481 rc = dquot_initialize(inode: 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(lock: &JFS_IP(inode: dip)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
493 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: 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, ip: dip, key: &dname, data: &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(lock: &JFS_IP(inode: ip)->commit_mutex);
508 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
509 IWRITE_UNLOCK(ip);
510 goto out1;
511 }
512
513 ASSERT(ip->i_nlink);
514
515 inode_set_mtime_to_ts(inode: dip,
516 ts: inode_set_ctime_to_ts(inode: dip, ts: inode_set_ctime_current(inode: ip)));
517 mark_inode_dirty(inode: dip);
518
519 /* update target's inode */
520 inode_dec_link_count(inode: ip);
521
522 /*
523 * commit zero link count object
524 */
525 if (ip->i_nlink == 0) {
526 assert(!test_cflag(COMMIT_Nolink, ip));
527 /* free block resources */
528 if ((new_size = commitZeroLink(tid, ip)) < 0) {
529 txAbort(tid, 1); /* Marks FS Dirty */
530 txEnd(tid);
531 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
532 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
533 IWRITE_UNLOCK(ip);
534 rc = new_size;
535 goto out1;
536 }
537 tblk = tid_to_tblock(tid);
538 tblk->xflag |= COMMIT_DELETE;
539 tblk->u.ip = ip;
540 }
541
542 /*
543 * Incomplete truncate of file data can
544 * result in timing problems unless we synchronously commit the
545 * transaction.
546 */
547 if (new_size)
548 commit_flag = COMMIT_SYNC;
549 else
550 commit_flag = 0;
551
552 /*
553 * If xtTruncate was incomplete, commit synchronously to avoid
554 * timing complications
555 */
556 rc = txCommit(tid, 2, &iplist[0], commit_flag);
557
558 txEnd(tid);
559
560 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
561 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
562
563 while (new_size && (rc == 0)) {
564 tid = txBegin(dip->i_sb, 0);
565 mutex_lock(&JFS_IP(ip)->commit_mutex);
566 new_size = xtTruncate_pmap(tid, ip, committed_size: new_size);
567 if (new_size < 0) {
568 txAbort(tid, 1); /* Marks FS Dirty */
569 rc = new_size;
570 } else
571 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
572 txEnd(tid);
573 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
574 }
575
576 if (ip->i_nlink == 0)
577 set_cflag(COMMIT_Nolink, ip);
578
579 IWRITE_UNLOCK(ip);
580
581 /*
582 * Truncating the directory index table is not guaranteed. It
583 * may need to be done iteratively
584 */
585 if (test_cflag(COMMIT_Stale, dip)) {
586 if (dip->i_size > 1)
587 jfs_truncate_nolock(dip, 0);
588
589 clear_cflag(COMMIT_Stale, dip);
590 }
591
592 out1:
593 free_UCSname(&dname);
594 out:
595 jfs_info("jfs_unlink: rc:%d", rc);
596 return rc;
597}
598
599/*
600 * NAME: commitZeroLink()
601 *
602 * FUNCTION: for non-directory, called by jfs_remove(),
603 * truncate a regular file, directory or symbolic
604 * link to zero length. return 0 if type is not
605 * one of these.
606 *
607 * if the file is currently associated with a VM segment
608 * only permanent disk and inode map resources are freed,
609 * and neither the inode nor indirect blocks are modified
610 * so that the resources can be later freed in the work
611 * map by ctrunc1.
612 * if there is no VM segment on entry, the resources are
613 * freed in both work and permanent map.
614 * (? for temporary file - memory object is cached even
615 * after no reference:
616 * reference count > 0 - )
617 *
618 * PARAMETERS: cd - pointer to commit data structure.
619 * current inode is the one to truncate.
620 *
621 * RETURN: Errors from subroutines
622 */
623static s64 commitZeroLink(tid_t tid, struct inode *ip)
624{
625 int filetype;
626 struct tblock *tblk;
627
628 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
629
630 filetype = ip->i_mode & S_IFMT;
631 switch (filetype) {
632 case S_IFREG:
633 break;
634 case S_IFLNK:
635 /* fast symbolic link */
636 if (ip->i_size < IDATASIZE) {
637 ip->i_size = 0;
638 return 0;
639 }
640 break;
641 default:
642 assert(filetype != S_IFDIR);
643 return 0;
644 }
645
646 set_cflag(COMMIT_Freewmap, ip);
647
648 /* mark transaction of block map update type */
649 tblk = tid_to_tblock(tid);
650 tblk->xflag |= COMMIT_PMAP;
651
652 /*
653 * free EA
654 */
655 if (JFS_IP(inode: ip)->ea.flag & DXD_EXTENT)
656 /* acquire maplock on EA to be freed from block map */
657 txEA(tid, ip, &JFS_IP(inode: ip)->ea, NULL);
658
659 /*
660 * free ACL
661 */
662 if (JFS_IP(inode: ip)->acl.flag & DXD_EXTENT)
663 /* acquire maplock on EA to be freed from block map */
664 txEA(tid, ip, &JFS_IP(inode: ip)->acl, NULL);
665
666 /*
667 * free xtree/data (truncate to zero length):
668 * free xtree/data pages from cache if COMMIT_PWMAP,
669 * free xtree/data blocks from persistent block map, and
670 * free xtree/data blocks from working block map if COMMIT_PWMAP;
671 */
672 if (ip->i_size)
673 return xtTruncate_pmap(tid, ip, committed_size: 0);
674
675 return 0;
676}
677
678
679/*
680 * NAME: jfs_free_zero_link()
681 *
682 * FUNCTION: for non-directory, called by iClose(),
683 * free resources of a file from cache and WORKING map
684 * for a file previously committed with zero link count
685 * while associated with a pager object,
686 *
687 * PARAMETER: ip - pointer to inode of file.
688 */
689void jfs_free_zero_link(struct inode *ip)
690{
691 int type;
692
693 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
694
695 /* return if not reg or symbolic link or if size is
696 * already ok.
697 */
698 type = ip->i_mode & S_IFMT;
699
700 switch (type) {
701 case S_IFREG:
702 break;
703 case S_IFLNK:
704 /* if its contained in inode nothing to do */
705 if (ip->i_size < IDATASIZE)
706 return;
707 break;
708 default:
709 return;
710 }
711
712 /*
713 * free EA
714 */
715 if (JFS_IP(inode: ip)->ea.flag & DXD_EXTENT) {
716 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
717 int xlen = lengthDXD(&JFS_IP(ip)->ea);
718 struct maplock maplock; /* maplock for COMMIT_WMAP */
719 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
720
721 /* free EA pages from cache */
722 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
723
724 /* free EA extent from working block map */
725 maplock.index = 1;
726 pxdlock = (struct pxd_lock *) & maplock;
727 pxdlock->flag = mlckFREEPXD;
728 PXDaddress(pxd: &pxdlock->pxd, addr: xaddr);
729 PXDlength(pxd: &pxdlock->pxd, len: xlen);
730 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
731 }
732
733 /*
734 * free ACL
735 */
736 if (JFS_IP(inode: ip)->acl.flag & DXD_EXTENT) {
737 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
738 int xlen = lengthDXD(&JFS_IP(ip)->acl);
739 struct maplock maplock; /* maplock for COMMIT_WMAP */
740 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
741
742 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
743
744 /* free ACL extent from working block map */
745 maplock.index = 1;
746 pxdlock = (struct pxd_lock *) & maplock;
747 pxdlock->flag = mlckFREEPXD;
748 PXDaddress(pxd: &pxdlock->pxd, addr: xaddr);
749 PXDlength(pxd: &pxdlock->pxd, len: xlen);
750 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
751 }
752
753 /*
754 * free xtree/data (truncate to zero length):
755 * free xtree/data pages from cache, and
756 * free xtree/data blocks from working block map;
757 */
758 if (ip->i_size)
759 xtTruncate(tid: 0, ip, newsize: 0, COMMIT_WMAP);
760}
761
762/*
763 * NAME: jfs_link(vp, dvp, name, crp)
764 *
765 * FUNCTION: create a link to <vp> by the name = <name>
766 * in the parent directory <dvp>
767 *
768 * PARAMETER: vp - target object
769 * dvp - parent directory of new link
770 * name - name of new link to target object
771 * crp - credential
772 *
773 * RETURN: Errors from subroutines
774 *
775 * note:
776 * JFS does NOT support link() on directories (to prevent circular
777 * path in the directory hierarchy);
778 * EPERM: the target object is a directory, and either the caller
779 * does not have appropriate privileges or the implementation prohibits
780 * using link() on directories [XPG4.2].
781 *
782 * JFS does NOT support links between file systems:
783 * EXDEV: target object and new link are on different file systems and
784 * implementation does not support links between file systems [XPG4.2].
785 */
786static int jfs_link(struct dentry *old_dentry,
787 struct inode *dir, struct dentry *dentry)
788{
789 int rc;
790 tid_t tid;
791 struct inode *ip = d_inode(dentry: old_dentry);
792 ino_t ino;
793 struct component_name dname;
794 struct btstack btstack;
795 struct inode *iplist[2];
796
797 jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
798
799 rc = dquot_initialize(inode: dir);
800 if (rc)
801 goto out;
802
803 if (isReadOnly(inode: ip)) {
804 jfs_error(ip->i_sb, "read-only filesystem\n");
805 return -EROFS;
806 }
807
808 tid = txBegin(ip->i_sb, 0);
809
810 mutex_lock_nested(lock: &JFS_IP(inode: dir)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
811 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: COMMIT_MUTEX_CHILD);
812
813 /*
814 * scan parent directory for entry/freespace
815 */
816 if ((rc = get_UCSname(&dname, dentry)))
817 goto out_tx;
818
819 if ((rc = dtSearch(ip: dir, key: &dname, data: &ino, btstack: &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, ip: dir, key: &dname, ino: &ino, btstack: &btstack)))
827 goto free_dname;
828
829 /* update object inode */
830 inc_nlink(inode: ip); /* for new link */
831 inode_set_ctime_current(inode: ip);
832 inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir));
833 mark_inode_dirty(inode: dir);
834 ihold(inode: ip);
835
836 iplist[0] = ip;
837 iplist[1] = dir;
838 rc = txCommit(tid, 2, &iplist[0], 0);
839
840 if (rc) {
841 drop_nlink(inode: ip); /* never instantiated */
842 iput(ip);
843 } else
844 d_instantiate(dentry, ip);
845
846 free_dname:
847 free_UCSname(&dname);
848
849 out_tx:
850 txEnd(tid);
851
852 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
853 mutex_unlock(lock: &JFS_IP(inode: dir)->commit_mutex);
854
855 out:
856 jfs_info("jfs_link: rc:%d", rc);
857 return rc;
858}
859
860/*
861 * NAME: jfs_symlink(dip, dentry, name)
862 *
863 * FUNCTION: creates a symbolic link to <symlink> by name <name>
864 * in directory <dip>
865 *
866 * PARAMETER: dip - parent directory vnode
867 * dentry - dentry of symbolic link
868 * name - the path name of the existing object
869 * that will be the source of the link
870 *
871 * RETURN: errors from subroutines
872 *
873 * note:
874 * ENAMETOOLONG: pathname resolution of a symbolic link produced
875 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
876*/
877
878static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
879 struct dentry *dentry, const char *name)
880{
881 int rc;
882 tid_t tid;
883 ino_t ino = 0;
884 struct component_name dname;
885 u32 ssize; /* source pathname size */
886 struct btstack btstack;
887 struct inode *ip;
888 s64 xlen = 0;
889 int bmask = 0, xsize;
890 s64 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 rc = dquot_initialize(inode: dip);
900 if (rc)
901 goto out1;
902
903 ssize = strlen(name) + 1;
904
905 /*
906 * search parent directory for entry/freespace
907 * (dtSearch() returns parent directory page pinned)
908 */
909
910 if ((rc = get_UCSname(&dname, dentry)))
911 goto out1;
912
913 /*
914 * allocate on-disk/in-memory inode for symbolic link:
915 * (iAlloc() returns new, locked inode)
916 */
917 ip = ialloc(dip, S_IFLNK | 0777);
918 if (IS_ERR(ptr: ip)) {
919 rc = PTR_ERR(ptr: ip);
920 goto out2;
921 }
922
923 tid = txBegin(dip->i_sb, 0);
924
925 mutex_lock_nested(lock: &JFS_IP(inode: dip)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
926 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: COMMIT_MUTEX_CHILD);
927
928 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
929 if (rc)
930 goto out3;
931
932 tblk = tid_to_tblock(tid);
933 tblk->xflag |= COMMIT_CREATE;
934 tblk->ino = ip->i_ino;
935 tblk->u.ixpxd = JFS_IP(inode: ip)->ixpxd;
936
937 /* fix symlink access permission
938 * (dir_create() ANDs in the u.u_cmask,
939 * but symlinks really need to be 777 access)
940 */
941 ip->i_mode |= 0777;
942
943 /*
944 * write symbolic link target path name
945 */
946 xtInitRoot(tid, ip);
947
948 /*
949 * write source path name inline in on-disk inode (fast symbolic link)
950 */
951
952 if (ssize <= IDATASIZE) {
953 ip->i_op = &jfs_fast_symlink_inode_operations;
954
955 ip->i_link = JFS_IP(inode: ip)->i_inline_all;
956 memcpy(ip->i_link, name, ssize);
957 ip->i_size = ssize - 1;
958
959 /*
960 * if symlink is > 128 bytes, we don't have the space to
961 * store inline extended attributes
962 */
963 if (ssize > sizeof (JFS_IP(inode: ip)->i_inline))
964 JFS_IP(inode: ip)->mode2 &= ~INLINEEA;
965
966 jfs_info("jfs_symlink: fast symlink added ssize:%u name:%s ",
967 ssize, name);
968 }
969 /*
970 * write source path name in a single extent
971 */
972 else {
973 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
974
975 ip->i_op = &jfs_symlink_inode_operations;
976 inode_nohighmem(inode: ip);
977 ip->i_mapping->a_ops = &jfs_aops;
978
979 /*
980 * even though the data of symlink object (source
981 * path name) is treated as non-journaled user data,
982 * it is read/written thru buffer cache for performance.
983 */
984 sb = ip->i_sb;
985 bmask = JFS_SBI(sb)->bsize - 1;
986 xsize = (ssize + bmask) & ~bmask;
987 xaddr = 0;
988 xlen = xsize >> JFS_SBI(sb)->l2bsize;
989 if ((rc = xtInsert(tid, ip, xflag: 0, xoff: 0, xlen, xaddrp: &xaddr, flag: 0))) {
990 txAbort(tid, 0);
991 goto out3;
992 }
993 ip->i_size = ssize - 1;
994 while (ssize) {
995 /* This is kind of silly since PATH_MAX == 4K */
996 u32 copy_size = min_t(u32, ssize, PSIZE);
997
998 mp = get_metapage(ip, xaddr, PSIZE, 1);
999
1000 if (mp == NULL) {
1001 xtTruncate(tid, ip, newsize: 0, COMMIT_PWMAP);
1002 rc = -EIO;
1003 txAbort(tid, 0);
1004 goto out3;
1005 }
1006 memcpy(mp->data, name, copy_size);
1007 flush_metapage(mp);
1008 ssize -= copy_size;
1009 name += copy_size;
1010 xaddr += JFS_SBI(sb)->nbperpage;
1011 }
1012 }
1013
1014 /*
1015 * create entry for symbolic link in parent directory
1016 */
1017 rc = dtSearch(ip: dip, key: &dname, data: &ino, btstack: &btstack, JFS_CREATE);
1018 if (rc == 0) {
1019 ino = ip->i_ino;
1020 rc = dtInsert(tid, ip: dip, key: &dname, ino: &ino, btstack: &btstack);
1021 }
1022 if (rc) {
1023 if (xlen)
1024 xtTruncate(tid, ip, newsize: 0, COMMIT_PWMAP);
1025 txAbort(tid, 0);
1026 /* discard new inode */
1027 goto out3;
1028 }
1029
1030 mark_inode_dirty(inode: ip);
1031
1032 inode_set_mtime_to_ts(inode: dip, ts: inode_set_ctime_current(inode: dip));
1033 mark_inode_dirty(inode: dip);
1034 /*
1035 * commit update of parent directory and link object
1036 */
1037
1038 iplist[0] = dip;
1039 iplist[1] = ip;
1040 rc = txCommit(tid, 2, &iplist[0], 0);
1041
1042 out3:
1043 txEnd(tid);
1044 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
1045 mutex_unlock(lock: &JFS_IP(inode: dip)->commit_mutex);
1046 if (rc) {
1047 free_ea_wmap(inode: ip);
1048 clear_nlink(inode: ip);
1049 discard_new_inode(ip);
1050 } else {
1051 d_instantiate_new(dentry, ip);
1052 }
1053
1054 out2:
1055 free_UCSname(&dname);
1056
1057 out1:
1058 jfs_info("jfs_symlink: rc:%d", rc);
1059 return rc;
1060}
1061
1062
1063/*
1064 * NAME: jfs_rename
1065 *
1066 * FUNCTION: rename a file or directory
1067 */
1068static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
1069 struct dentry *old_dentry, struct inode *new_dir,
1070 struct dentry *new_dentry, unsigned int flags)
1071{
1072 struct btstack btstack;
1073 ino_t ino;
1074 struct component_name new_dname;
1075 struct inode *new_ip;
1076 struct component_name old_dname;
1077 struct inode *old_ip;
1078 int rc;
1079 tid_t tid;
1080 struct tlock *tlck;
1081 struct dt_lock *dtlck;
1082 struct lv *lv;
1083 int ipcount;
1084 struct inode *iplist[4];
1085 struct tblock *tblk;
1086 s64 new_size = 0;
1087 int commit_flag;
1088
1089 if (flags & ~RENAME_NOREPLACE)
1090 return -EINVAL;
1091
1092 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1093
1094 rc = dquot_initialize(inode: old_dir);
1095 if (rc)
1096 goto out1;
1097 rc = dquot_initialize(inode: new_dir);
1098 if (rc)
1099 goto out1;
1100
1101 old_ip = d_inode(dentry: old_dentry);
1102 new_ip = d_inode(dentry: new_dentry);
1103
1104 if ((rc = get_UCSname(&old_dname, old_dentry)))
1105 goto out1;
1106
1107 if ((rc = get_UCSname(&new_dname, new_dentry)))
1108 goto out2;
1109
1110 /*
1111 * Make sure source inode number is what we think it is
1112 */
1113 rc = dtSearch(ip: old_dir, key: &old_dname, data: &ino, btstack: &btstack, JFS_LOOKUP);
1114 if (rc || (ino != old_ip->i_ino)) {
1115 rc = -ENOENT;
1116 goto out3;
1117 }
1118
1119 /*
1120 * Make sure dest inode number (if any) is what we think it is
1121 */
1122 rc = dtSearch(ip: new_dir, key: &new_dname, data: &ino, btstack: &btstack, JFS_LOOKUP);
1123 if (!rc) {
1124 if ((!new_ip) || (ino != new_ip->i_ino)) {
1125 rc = -ESTALE;
1126 goto out3;
1127 }
1128 } else if (rc != -ENOENT)
1129 goto out3;
1130 else if (new_ip) {
1131 /* no entry exists, but one was expected */
1132 rc = -ESTALE;
1133 goto out3;
1134 }
1135
1136 if (S_ISDIR(old_ip->i_mode)) {
1137 if (new_ip) {
1138 if (!dtEmpty(new_ip)) {
1139 rc = -ENOTEMPTY;
1140 goto out3;
1141 }
1142 }
1143 } else if (new_ip) {
1144 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1145 /* Init inode for quota operations. */
1146 rc = dquot_initialize(inode: new_ip);
1147 if (rc)
1148 goto out_unlock;
1149 }
1150
1151 /*
1152 * The real work starts here
1153 */
1154 tid = txBegin(new_dir->i_sb, 0);
1155
1156 /*
1157 * How do we know the locking is safe from deadlocks?
1158 * The vfs does the hard part for us. Any time we are taking nested
1159 * commit_mutexes, the vfs already has i_mutex held on the parent.
1160 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1161 */
1162 mutex_lock_nested(lock: &JFS_IP(inode: new_dir)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
1163 mutex_lock_nested(lock: &JFS_IP(inode: old_ip)->commit_mutex, subclass: COMMIT_MUTEX_CHILD);
1164 if (old_dir != new_dir)
1165 mutex_lock_nested(lock: &JFS_IP(inode: old_dir)->commit_mutex,
1166 subclass: COMMIT_MUTEX_SECOND_PARENT);
1167
1168 if (new_ip) {
1169 mutex_lock_nested(lock: &JFS_IP(inode: new_ip)->commit_mutex,
1170 subclass: COMMIT_MUTEX_VICTIM);
1171 /*
1172 * Change existing directory entry to new inode number
1173 */
1174 ino = new_ip->i_ino;
1175 rc = dtModify(tid, ip: new_dir, key: &new_dname, orig_ino: &ino,
1176 new_ino: old_ip->i_ino, JFS_RENAME);
1177 if (rc)
1178 goto out_tx;
1179 drop_nlink(inode: new_ip);
1180 if (S_ISDIR(new_ip->i_mode)) {
1181 drop_nlink(inode: new_ip);
1182 if (new_ip->i_nlink) {
1183 mutex_unlock(lock: &JFS_IP(inode: new_ip)->commit_mutex);
1184 if (old_dir != new_dir)
1185 mutex_unlock(lock: &JFS_IP(inode: old_dir)->commit_mutex);
1186 mutex_unlock(lock: &JFS_IP(inode: old_ip)->commit_mutex);
1187 mutex_unlock(lock: &JFS_IP(inode: new_dir)->commit_mutex);
1188 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1189 IWRITE_UNLOCK(new_ip);
1190 jfs_error(new_ip->i_sb,
1191 "new_ip->i_nlink != 0\n");
1192 return -EIO;
1193 }
1194 tblk = tid_to_tblock(tid);
1195 tblk->xflag |= COMMIT_DELETE;
1196 tblk->u.ip = new_ip;
1197 } else if (new_ip->i_nlink == 0) {
1198 assert(!test_cflag(COMMIT_Nolink, new_ip));
1199 /* free block resources */
1200 if ((new_size = commitZeroLink(tid, ip: new_ip)) < 0) {
1201 txAbort(tid, 1); /* Marks FS Dirty */
1202 rc = new_size;
1203 goto out_tx;
1204 }
1205 tblk = tid_to_tblock(tid);
1206 tblk->xflag |= COMMIT_DELETE;
1207 tblk->u.ip = new_ip;
1208 } else {
1209 inode_set_ctime_current(inode: new_ip);
1210 mark_inode_dirty(inode: new_ip);
1211 }
1212 } else {
1213 /*
1214 * Add new directory entry
1215 */
1216 rc = dtSearch(ip: new_dir, key: &new_dname, data: &ino, btstack: &btstack,
1217 JFS_CREATE);
1218 if (rc) {
1219 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1220 rc);
1221 goto out_tx;
1222 }
1223
1224 ino = old_ip->i_ino;
1225 rc = dtInsert(tid, ip: new_dir, key: &new_dname, ino: &ino, btstack: &btstack);
1226 if (rc) {
1227 if (rc == -EIO)
1228 jfs_err("jfs_rename: dtInsert returned -EIO");
1229 goto out_tx;
1230 }
1231 if (S_ISDIR(old_ip->i_mode))
1232 inc_nlink(inode: new_dir);
1233 }
1234 /*
1235 * Remove old directory entry
1236 */
1237
1238 ino = old_ip->i_ino;
1239 rc = dtDelete(tid, ip: old_dir, key: &old_dname, data: &ino, JFS_REMOVE);
1240 if (rc) {
1241 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1242 rc);
1243 txAbort(tid, 1); /* Marks Filesystem dirty */
1244 goto out_tx;
1245 }
1246 if (S_ISDIR(old_ip->i_mode)) {
1247 drop_nlink(inode: old_dir);
1248 if (old_dir != new_dir) {
1249 /*
1250 * Change inode number of parent for moved directory
1251 */
1252
1253 JFS_IP(inode: old_ip)->i_dtroot.header.idotdot =
1254 cpu_to_le32(new_dir->i_ino);
1255
1256 /* Linelock header of dtree */
1257 tlck = txLock(tid, old_ip,
1258 (struct metapage *) &JFS_IP(inode: old_ip)->bxflag,
1259 tlckDTREE | tlckBTROOT | tlckRELINK);
1260 dtlck = (struct dt_lock *) & tlck->lock;
1261 ASSERT(dtlck->index == 0);
1262 lv = & dtlck->lv[0];
1263 lv->offset = 0;
1264 lv->length = 1;
1265 dtlck->index++;
1266 }
1267 }
1268
1269 /*
1270 * Update ctime on changed/moved inodes & mark dirty
1271 */
1272 inode_set_ctime_current(inode: old_ip);
1273 mark_inode_dirty(inode: old_ip);
1274
1275 inode_set_mtime_to_ts(inode: new_dir, ts: inode_set_ctime_current(inode: new_dir));
1276 mark_inode_dirty(inode: new_dir);
1277
1278 /* Build list of inodes modified by this transaction */
1279 ipcount = 0;
1280 iplist[ipcount++] = old_ip;
1281 if (new_ip)
1282 iplist[ipcount++] = new_ip;
1283 iplist[ipcount++] = old_dir;
1284
1285 if (old_dir != new_dir) {
1286 iplist[ipcount++] = new_dir;
1287 inode_set_mtime_to_ts(inode: old_dir,
1288 ts: inode_set_ctime_current(inode: old_dir));
1289 mark_inode_dirty(inode: old_dir);
1290 }
1291
1292 /*
1293 * Incomplete truncate of file data can
1294 * result in timing problems unless we synchronously commit the
1295 * transaction.
1296 */
1297 if (new_size)
1298 commit_flag = COMMIT_SYNC;
1299 else
1300 commit_flag = 0;
1301
1302 rc = txCommit(tid, ipcount, iplist, commit_flag);
1303
1304 out_tx:
1305 txEnd(tid);
1306 if (new_ip)
1307 mutex_unlock(lock: &JFS_IP(inode: new_ip)->commit_mutex);
1308 if (old_dir != new_dir)
1309 mutex_unlock(lock: &JFS_IP(inode: old_dir)->commit_mutex);
1310 mutex_unlock(lock: &JFS_IP(inode: old_ip)->commit_mutex);
1311 mutex_unlock(lock: &JFS_IP(inode: new_dir)->commit_mutex);
1312
1313 while (new_size && (rc == 0)) {
1314 tid = txBegin(new_ip->i_sb, 0);
1315 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1316 new_size = xtTruncate_pmap(tid, ip: new_ip, committed_size: new_size);
1317 if (new_size < 0) {
1318 txAbort(tid, 1);
1319 rc = new_size;
1320 } else
1321 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1322 txEnd(tid);
1323 mutex_unlock(lock: &JFS_IP(inode: new_ip)->commit_mutex);
1324 }
1325 if (new_ip && (new_ip->i_nlink == 0))
1326 set_cflag(COMMIT_Nolink, new_ip);
1327 /*
1328 * Truncating the directory index table is not guaranteed. It
1329 * may need to be done iteratively
1330 */
1331 if (test_cflag(COMMIT_Stale, old_dir)) {
1332 if (old_dir->i_size > 1)
1333 jfs_truncate_nolock(old_dir, 0);
1334
1335 clear_cflag(COMMIT_Stale, old_dir);
1336 }
1337 out_unlock:
1338 if (new_ip && !S_ISDIR(new_ip->i_mode))
1339 IWRITE_UNLOCK(new_ip);
1340 out3:
1341 free_UCSname(&new_dname);
1342 out2:
1343 free_UCSname(&old_dname);
1344 out1:
1345 jfs_info("jfs_rename: returning %d", rc);
1346 return rc;
1347}
1348
1349
1350/*
1351 * NAME: jfs_mknod
1352 *
1353 * FUNCTION: Create a special file (device)
1354 */
1355static int jfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1356 struct dentry *dentry, umode_t mode, dev_t rdev)
1357{
1358 struct jfs_inode_info *jfs_ip;
1359 struct btstack btstack;
1360 struct component_name dname;
1361 ino_t ino;
1362 struct inode *ip;
1363 struct inode *iplist[2];
1364 int rc;
1365 tid_t tid;
1366 struct tblock *tblk;
1367
1368 jfs_info("jfs_mknod: %pd", dentry);
1369
1370 rc = dquot_initialize(inode: dir);
1371 if (rc)
1372 goto out;
1373
1374 if ((rc = get_UCSname(&dname, dentry)))
1375 goto out;
1376
1377 ip = ialloc(dir, mode);
1378 if (IS_ERR(ptr: ip)) {
1379 rc = PTR_ERR(ptr: ip);
1380 goto out1;
1381 }
1382 jfs_ip = JFS_IP(inode: ip);
1383
1384 tid = txBegin(dir->i_sb, 0);
1385
1386 mutex_lock_nested(lock: &JFS_IP(inode: dir)->commit_mutex, subclass: COMMIT_MUTEX_PARENT);
1387 mutex_lock_nested(lock: &JFS_IP(inode: ip)->commit_mutex, subclass: COMMIT_MUTEX_CHILD);
1388
1389 rc = jfs_init_acl(tid, ip, dir);
1390 if (rc)
1391 goto out3;
1392
1393 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1394 if (rc) {
1395 txAbort(tid, 0);
1396 goto out3;
1397 }
1398
1399 if ((rc = dtSearch(ip: dir, key: &dname, data: &ino, btstack: &btstack, JFS_CREATE))) {
1400 txAbort(tid, 0);
1401 goto out3;
1402 }
1403
1404 tblk = tid_to_tblock(tid);
1405 tblk->xflag |= COMMIT_CREATE;
1406 tblk->ino = ip->i_ino;
1407 tblk->u.ixpxd = JFS_IP(inode: ip)->ixpxd;
1408
1409 ino = ip->i_ino;
1410 if ((rc = dtInsert(tid, ip: dir, key: &dname, ino: &ino, btstack: &btstack))) {
1411 txAbort(tid, 0);
1412 goto out3;
1413 }
1414
1415 ip->i_op = &jfs_file_inode_operations;
1416 jfs_ip->dev = new_encode_dev(dev: rdev);
1417 init_special_inode(ip, ip->i_mode, rdev);
1418
1419 mark_inode_dirty(inode: ip);
1420
1421 inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir));
1422
1423 mark_inode_dirty(inode: dir);
1424
1425 iplist[0] = dir;
1426 iplist[1] = ip;
1427 rc = txCommit(tid, 2, iplist, 0);
1428
1429 out3:
1430 txEnd(tid);
1431 mutex_unlock(lock: &JFS_IP(inode: ip)->commit_mutex);
1432 mutex_unlock(lock: &JFS_IP(inode: dir)->commit_mutex);
1433 if (rc) {
1434 free_ea_wmap(inode: ip);
1435 clear_nlink(inode: ip);
1436 discard_new_inode(ip);
1437 } else {
1438 d_instantiate_new(dentry, ip);
1439 }
1440
1441 out1:
1442 free_UCSname(&dname);
1443
1444 out:
1445 jfs_info("jfs_mknod: returning %d", rc);
1446 return rc;
1447}
1448
1449static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1450{
1451 struct btstack btstack;
1452 ino_t inum;
1453 struct inode *ip;
1454 struct component_name key;
1455 int rc;
1456
1457 jfs_info("jfs_lookup: name = %pd", dentry);
1458
1459 if ((rc = get_UCSname(&key, dentry)))
1460 return ERR_PTR(error: rc);
1461 rc = dtSearch(ip: dip, key: &key, data: &inum, btstack: &btstack, JFS_LOOKUP);
1462 free_UCSname(&key);
1463 if (rc == -ENOENT) {
1464 ip = NULL;
1465 } else if (rc) {
1466 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1467 ip = ERR_PTR(error: rc);
1468 } else {
1469 ip = jfs_iget(dip->i_sb, inum);
1470 if (IS_ERR(ptr: ip))
1471 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1472 }
1473
1474 return d_splice_alias(ip, dentry);
1475}
1476
1477static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1478 u64 ino, u32 generation)
1479{
1480 struct inode *inode;
1481
1482 if (ino == 0)
1483 return ERR_PTR(error: -ESTALE);
1484 inode = jfs_iget(sb, ino);
1485 if (IS_ERR(ptr: inode))
1486 return ERR_CAST(ptr: inode);
1487
1488 if (generation && inode->i_generation != generation) {
1489 iput(inode);
1490 return ERR_PTR(error: -ESTALE);
1491 }
1492
1493 return inode;
1494}
1495
1496struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1497 int fh_len, int fh_type)
1498{
1499 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1500 get_inode: jfs_nfs_get_inode);
1501}
1502
1503struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1504 int fh_len, int fh_type)
1505{
1506 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1507 get_inode: jfs_nfs_get_inode);
1508}
1509
1510struct dentry *jfs_get_parent(struct dentry *dentry)
1511{
1512 unsigned long parent_ino;
1513
1514 parent_ino =
1515 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1516
1517 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1518}
1519
1520const struct inode_operations jfs_dir_inode_operations = {
1521 .create = jfs_create,
1522 .lookup = jfs_lookup,
1523 .link = jfs_link,
1524 .unlink = jfs_unlink,
1525 .symlink = jfs_symlink,
1526 .mkdir = jfs_mkdir,
1527 .rmdir = jfs_rmdir,
1528 .mknod = jfs_mknod,
1529 .rename = jfs_rename,
1530 .listxattr = jfs_listxattr,
1531 .setattr = jfs_setattr,
1532 .fileattr_get = jfs_fileattr_get,
1533 .fileattr_set = jfs_fileattr_set,
1534#ifdef CONFIG_JFS_POSIX_ACL
1535 .get_inode_acl = jfs_get_acl,
1536 .set_acl = jfs_set_acl,
1537#endif
1538};
1539
1540WRAP_DIR_ITER(jfs_readdir) // FIXME!
1541const struct file_operations jfs_dir_operations = {
1542 .read = generic_read_dir,
1543 .iterate_shared = shared_jfs_readdir,
1544 .fsync = jfs_fsync,
1545 .unlocked_ioctl = jfs_ioctl,
1546 .compat_ioctl = compat_ptr_ioctl,
1547 .llseek = generic_file_llseek,
1548};
1549
1550static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1551{
1552 unsigned long hash;
1553 int i;
1554
1555 hash = init_name_hash(dir);
1556 for (i=0; i < this->len; i++)
1557 hash = partial_name_hash(tolower(this->name[i]), prevhash: hash);
1558 this->hash = end_name_hash(hash);
1559
1560 return 0;
1561}
1562
1563static int jfs_ci_compare(const struct dentry *dentry,
1564 unsigned int len, const char *str, const struct qstr *name)
1565{
1566 int i, result = 1;
1567
1568 if (len != name->len)
1569 goto out;
1570 for (i=0; i < len; i++) {
1571 if (tolower(str[i]) != tolower(name->name[i]))
1572 goto out;
1573 }
1574 result = 0;
1575out:
1576 return result;
1577}
1578
1579static int jfs_ci_revalidate(struct inode *dir, const struct qstr *name,
1580 struct dentry *dentry, unsigned int flags)
1581{
1582 /*
1583 * This is not negative dentry. Always valid.
1584 *
1585 * Note, rename() to existing directory entry will have ->d_inode,
1586 * and will use existing name which isn't specified name by user.
1587 *
1588 * We may be able to drop this positive dentry here. But dropping
1589 * positive dentry isn't good idea. So it's unsupported like
1590 * rename("filename", "FILENAME") for now.
1591 */
1592 if (d_really_is_positive(dentry))
1593 return 1;
1594
1595 /*
1596 * This may be nfsd (or something), anyway, we can't see the
1597 * intent of this. So, since this can be for creation, drop it.
1598 */
1599 if (!flags)
1600 return 0;
1601
1602 /*
1603 * Drop the negative dentry, in order to make sure to use the
1604 * case sensitive name which is specified by user if this is
1605 * for creation.
1606 */
1607 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1608 return 0;
1609 return 1;
1610}
1611
1612const struct dentry_operations jfs_ci_dentry_operations =
1613{
1614 .d_hash = jfs_ci_hash,
1615 .d_compare = jfs_ci_compare,
1616 .d_revalidate = jfs_ci_revalidate,
1617};
1618

source code of linux/fs/jfs/namei.c