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/filelock.h>
9 #include <linux/namei.h>
10 #include <linux/ctype.h>
11 #include <linux/quotaops.h>
12 #include <linux/exportfs.h>
13 #include "jfs_incore.h"
14 #include "jfs_superblock.h"
15 #include "jfs_inode.h"
16 #include "jfs_dinode.h"
17 #include "jfs_dmap.h"
18 #include "jfs_unicode.h"
19 #include "jfs_metapage.h"
20 #include "jfs_xattr.h"
21 #include "jfs_acl.h"
22 #include "jfs_debug.h"
23
24 /*
25 * forward references
26 */
27 const struct dentry_operations jfs_ci_dentry_operations;
28
29 static s64 commitZeroLink(tid_t, struct inode *);
30
31 /*
32 * NAME: free_ea_wmap(inode)
33 *
34 * FUNCTION: free uncommitted extended attributes from working map
35 *
36 */
free_ea_wmap(struct inode * inode)37 static inline void free_ea_wmap(struct inode *inode)
38 {
39 dxd_t *ea = &JFS_IP(inode)->ea;
40
41 if (ea->flag & DXD_EXTENT) {
42 /* free EA pages from cache */
43 invalidate_dxd_metapages(inode, *ea);
44 dbFree(inode, addressDXD(ea), lengthDXD(ea));
45 }
46 ea->flag = 0;
47 }
48
49 /*
50 * NAME: jfs_create(dip, dentry, mode)
51 *
52 * FUNCTION: create a regular file in the parent directory <dip>
53 * with name = <from dentry> and mode = <mode>
54 *
55 * PARAMETER: dip - parent directory vnode
56 * dentry - dentry of new file
57 * mode - create mode (rwxrwxrwx).
58 * nd- nd struct
59 *
60 * RETURN: Errors from subroutines
61 *
62 */
jfs_create(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,umode_t mode,bool excl)63 static int jfs_create(struct mnt_idmap *idmap, struct inode *dip,
64 struct dentry *dentry, umode_t mode, bool excl)
65 {
66 int rc = 0;
67 tid_t tid; /* transaction id */
68 struct inode *ip = NULL; /* child directory inode */
69 ino_t ino;
70 struct component_name dname; /* child directory name */
71 struct btstack btstack;
72 struct inode *iplist[2];
73 struct tblock *tblk;
74
75 jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
76
77 rc = dquot_initialize(dip);
78 if (rc)
79 goto out1;
80
81 /*
82 * search parent directory for entry/freespace
83 * (dtSearch() returns parent directory page pinned)
84 */
85 if ((rc = get_UCSname(&dname, dentry)))
86 goto out1;
87
88 /*
89 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
90 * block there while holding dtree page, so we allocate the inode &
91 * begin the transaction before we search the directory.
92 */
93 ip = ialloc(dip, mode);
94 if (IS_ERR(ip)) {
95 rc = PTR_ERR(ip);
96 goto out2;
97 }
98
99 tid = txBegin(dip->i_sb, 0);
100
101 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
102 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
103
104 rc = jfs_init_acl(tid, ip, dip);
105 if (rc)
106 goto out3;
107
108 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
109 if (rc) {
110 txAbort(tid, 0);
111 goto out3;
112 }
113
114 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
115 jfs_err("jfs_create: dtSearch returned %d", rc);
116 txAbort(tid, 0);
117 goto out3;
118 }
119
120 tblk = tid_to_tblock(tid);
121 tblk->xflag |= COMMIT_CREATE;
122 tblk->ino = ip->i_ino;
123 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
124
125 iplist[0] = dip;
126 iplist[1] = ip;
127
128 /*
129 * initialize the child XAD tree root in-line in inode
130 */
131 xtInitRoot(tid, ip);
132
133 /*
134 * create entry in parent directory for child directory
135 * (dtInsert() releases parent directory page)
136 */
137 ino = ip->i_ino;
138 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
139 if (rc == -EIO) {
140 jfs_err("jfs_create: dtInsert returned -EIO");
141 txAbort(tid, 1); /* Marks Filesystem dirty */
142 } else
143 txAbort(tid, 0); /* Filesystem full */
144 goto out3;
145 }
146
147 ip->i_op = &jfs_file_inode_operations;
148 ip->i_fop = &jfs_file_operations;
149 ip->i_mapping->a_ops = &jfs_aops;
150
151 mark_inode_dirty(ip);
152
153 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip));
154
155 mark_inode_dirty(dip);
156
157 rc = txCommit(tid, 2, &iplist[0], 0);
158
159 out3:
160 txEnd(tid);
161 mutex_unlock(&JFS_IP(ip)->commit_mutex);
162 mutex_unlock(&JFS_IP(dip)->commit_mutex);
163 if (rc) {
164 free_ea_wmap(ip);
165 clear_nlink(ip);
166 discard_new_inode(ip);
167 } else {
168 d_instantiate_new(dentry, ip);
169 }
170
171 out2:
172 free_UCSname(&dname);
173
174 out1:
175
176 jfs_info("jfs_create: rc:%d", rc);
177 return rc;
178 }
179
180
181 /*
182 * NAME: jfs_mkdir(dip, dentry, mode)
183 *
184 * FUNCTION: create a child directory in the parent directory <dip>
185 * with name = <from dentry> and mode = <mode>
186 *
187 * PARAMETER: dip - parent directory vnode
188 * dentry - dentry of child directory
189 * mode - create mode (rwxrwxrwx).
190 *
191 * RETURN: ERR_PTR() of errors from subroutines.
192 *
193 * note:
194 * EACCES: user needs search+write permission on the parent directory
195 */
jfs_mkdir(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,umode_t mode)196 static struct dentry *jfs_mkdir(struct mnt_idmap *idmap, struct inode *dip,
197 struct dentry *dentry, umode_t mode)
198 {
199 int rc = 0;
200 tid_t tid; /* transaction id */
201 struct inode *ip = NULL; /* child directory inode */
202 ino_t ino;
203 struct component_name dname; /* child directory name */
204 struct btstack btstack;
205 struct inode *iplist[2];
206 struct tblock *tblk;
207
208 jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
209
210 rc = dquot_initialize(dip);
211 if (rc)
212 goto out1;
213
214 /*
215 * search parent directory for entry/freespace
216 * (dtSearch() returns parent directory page pinned)
217 */
218 if ((rc = get_UCSname(&dname, dentry)))
219 goto out1;
220
221 /*
222 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
223 * block there while holding dtree page, so we allocate the inode &
224 * begin the transaction before we search the directory.
225 */
226 ip = ialloc(dip, S_IFDIR | mode);
227 if (IS_ERR(ip)) {
228 rc = PTR_ERR(ip);
229 goto out2;
230 }
231
232 tid = txBegin(dip->i_sb, 0);
233
234 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
235 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
236
237 rc = jfs_init_acl(tid, ip, dip);
238 if (rc)
239 goto out3;
240
241 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
242 if (rc) {
243 txAbort(tid, 0);
244 goto out3;
245 }
246
247 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
248 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
249 txAbort(tid, 0);
250 goto out3;
251 }
252
253 tblk = tid_to_tblock(tid);
254 tblk->xflag |= COMMIT_CREATE;
255 tblk->ino = ip->i_ino;
256 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
257
258 iplist[0] = dip;
259 iplist[1] = ip;
260
261 /*
262 * initialize the child directory in-line in inode
263 */
264 dtInitRoot(tid, ip, dip->i_ino);
265
266 /*
267 * create entry in parent directory for child directory
268 * (dtInsert() releases parent directory page)
269 */
270 ino = ip->i_ino;
271 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
272 if (rc == -EIO) {
273 jfs_err("jfs_mkdir: dtInsert returned -EIO");
274 txAbort(tid, 1); /* Marks Filesystem dirty */
275 } else
276 txAbort(tid, 0); /* Filesystem full */
277 goto out3;
278 }
279
280 set_nlink(ip, 2); /* for '.' */
281 ip->i_op = &jfs_dir_inode_operations;
282 ip->i_fop = &jfs_dir_operations;
283
284 mark_inode_dirty(ip);
285
286 /* update parent directory inode */
287 inc_nlink(dip); /* for '..' from child directory */
288 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip));
289 mark_inode_dirty(dip);
290
291 rc = txCommit(tid, 2, &iplist[0], 0);
292
293 out3:
294 txEnd(tid);
295 mutex_unlock(&JFS_IP(ip)->commit_mutex);
296 mutex_unlock(&JFS_IP(dip)->commit_mutex);
297 if (rc) {
298 free_ea_wmap(ip);
299 clear_nlink(ip);
300 discard_new_inode(ip);
301 } else {
302 d_instantiate_new(dentry, ip);
303 }
304
305 out2:
306 free_UCSname(&dname);
307
308
309 out1:
310
311 jfs_info("jfs_mkdir: rc:%d", rc);
312 return rc ? ERR_PTR(rc) : NULL;
313 }
314
315 /*
316 * NAME: jfs_rmdir(dip, dentry)
317 *
318 * FUNCTION: remove a link to child directory
319 *
320 * PARAMETER: dip - parent inode
321 * dentry - child directory dentry
322 *
323 * RETURN: -EINVAL - if name is . or ..
324 * -EINVAL - if . or .. exist but are invalid.
325 * errors from subroutines
326 *
327 * note:
328 * if other threads have the directory open when the last link
329 * is removed, the "." and ".." entries, if present, are removed before
330 * rmdir() returns and no new entries may be created in the directory,
331 * but the directory is not removed until the last reference to
332 * the directory is released (cf.unlink() of regular file).
333 */
jfs_rmdir(struct inode * dip,struct dentry * dentry)334 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
335 {
336 int rc;
337 tid_t tid; /* transaction id */
338 struct inode *ip = d_inode(dentry);
339 ino_t ino;
340 struct component_name dname;
341 struct inode *iplist[2];
342 struct tblock *tblk;
343
344 jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
345
346 /* Init inode for quota operations. */
347 rc = dquot_initialize(dip);
348 if (rc)
349 goto out;
350 rc = dquot_initialize(ip);
351 if (rc)
352 goto out;
353
354 /* directory must be empty to be removed */
355 if (!dtEmpty(ip)) {
356 rc = -ENOTEMPTY;
357 goto out;
358 }
359
360 if ((rc = get_UCSname(&dname, dentry))) {
361 goto out;
362 }
363
364 tid = txBegin(dip->i_sb, 0);
365
366 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
367 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
368
369 iplist[0] = dip;
370 iplist[1] = ip;
371
372 tblk = tid_to_tblock(tid);
373 tblk->xflag |= COMMIT_DELETE;
374 tblk->u.ip = ip;
375
376 /*
377 * delete the entry of target directory from parent directory
378 */
379 ino = ip->i_ino;
380 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
381 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
382 if (rc == -EIO)
383 txAbort(tid, 1);
384 txEnd(tid);
385 mutex_unlock(&JFS_IP(ip)->commit_mutex);
386 mutex_unlock(&JFS_IP(dip)->commit_mutex);
387
388 goto out2;
389 }
390
391 /* update parent directory's link count corresponding
392 * to ".." entry of the target directory deleted
393 */
394 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip));
395 inode_dec_link_count(dip);
396
397 /*
398 * OS/2 could have created EA and/or ACL
399 */
400 /* free EA from both persistent and working map */
401 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
402 /* free EA pages */
403 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
404 }
405 JFS_IP(ip)->ea.flag = 0;
406
407 /* free ACL from both persistent and working map */
408 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
409 /* free ACL pages */
410 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
411 }
412 JFS_IP(ip)->acl.flag = 0;
413
414 /* mark the target directory as deleted */
415 clear_nlink(ip);
416 mark_inode_dirty(ip);
417
418 rc = txCommit(tid, 2, &iplist[0], 0);
419
420 txEnd(tid);
421
422 mutex_unlock(&JFS_IP(ip)->commit_mutex);
423 mutex_unlock(&JFS_IP(dip)->commit_mutex);
424
425 /*
426 * Truncating the directory index table is not guaranteed. It
427 * may need to be done iteratively
428 */
429 if (test_cflag(COMMIT_Stale, dip)) {
430 if (dip->i_size > 1)
431 jfs_truncate_nolock(dip, 0);
432
433 clear_cflag(COMMIT_Stale, dip);
434 }
435
436 out2:
437 free_UCSname(&dname);
438
439 out:
440 jfs_info("jfs_rmdir: rc:%d", rc);
441 return rc;
442 }
443
444 /*
445 * NAME: jfs_unlink(dip, dentry)
446 *
447 * FUNCTION: remove a link to object <vp> named by <name>
448 * from parent directory <dvp>
449 *
450 * PARAMETER: dip - inode of parent directory
451 * dentry - dentry of object to be removed
452 *
453 * RETURN: errors from subroutines
454 *
455 * note:
456 * temporary file: if one or more processes have the file open
457 * when the last link is removed, the link will be removed before
458 * unlink() returns, but the removal of the file contents will be
459 * postponed until all references to the files are closed.
460 *
461 * JFS does NOT support unlink() on directories.
462 *
463 */
jfs_unlink(struct inode * dip,struct dentry * dentry)464 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
465 {
466 int rc;
467 tid_t tid; /* transaction id */
468 struct inode *ip = d_inode(dentry);
469 ino_t ino;
470 struct component_name dname; /* object name */
471 struct inode *iplist[2];
472 struct tblock *tblk;
473 s64 new_size = 0;
474 int commit_flag;
475
476 jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
477
478 /* Init inode for quota operations. */
479 rc = dquot_initialize(dip);
480 if (rc)
481 goto out;
482 rc = dquot_initialize(ip);
483 if (rc)
484 goto out;
485
486 if ((rc = get_UCSname(&dname, dentry)))
487 goto out;
488
489 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
490
491 tid = txBegin(dip->i_sb, 0);
492
493 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
494 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
495
496 iplist[0] = dip;
497 iplist[1] = ip;
498
499 /*
500 * delete the entry of target file from parent directory
501 */
502 ino = ip->i_ino;
503 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
504 jfs_err("jfs_unlink: dtDelete returned %d", rc);
505 if (rc == -EIO)
506 txAbort(tid, 1); /* Marks FS Dirty */
507 txEnd(tid);
508 mutex_unlock(&JFS_IP(ip)->commit_mutex);
509 mutex_unlock(&JFS_IP(dip)->commit_mutex);
510 IWRITE_UNLOCK(ip);
511 goto out1;
512 }
513
514 ASSERT(ip->i_nlink);
515
516 inode_set_mtime_to_ts(dip,
517 inode_set_ctime_to_ts(dip, inode_set_ctime_current(ip)));
518 mark_inode_dirty(dip);
519
520 /* update target's inode */
521 inode_dec_link_count(ip);
522
523 /*
524 * commit zero link count object
525 */
526 if (ip->i_nlink == 0) {
527 assert(!test_cflag(COMMIT_Nolink, ip));
528 /* free block resources */
529 if ((new_size = commitZeroLink(tid, ip)) < 0) {
530 txAbort(tid, 1); /* Marks FS Dirty */
531 txEnd(tid);
532 mutex_unlock(&JFS_IP(ip)->commit_mutex);
533 mutex_unlock(&JFS_IP(dip)->commit_mutex);
534 IWRITE_UNLOCK(ip);
535 rc = new_size;
536 goto out1;
537 }
538 tblk = tid_to_tblock(tid);
539 tblk->xflag |= COMMIT_DELETE;
540 tblk->u.ip = ip;
541 }
542
543 /*
544 * Incomplete truncate of file data can
545 * result in timing problems unless we synchronously commit the
546 * transaction.
547 */
548 if (new_size)
549 commit_flag = COMMIT_SYNC;
550 else
551 commit_flag = 0;
552
553 /*
554 * If xtTruncate was incomplete, commit synchronously to avoid
555 * timing complications
556 */
557 rc = txCommit(tid, 2, &iplist[0], commit_flag);
558
559 txEnd(tid);
560
561 mutex_unlock(&JFS_IP(ip)->commit_mutex);
562 mutex_unlock(&JFS_IP(dip)->commit_mutex);
563
564 while (new_size && (rc == 0)) {
565 tid = txBegin(dip->i_sb, 0);
566 mutex_lock(&JFS_IP(ip)->commit_mutex);
567 new_size = xtTruncate_pmap(tid, ip, new_size);
568 if (new_size < 0) {
569 txAbort(tid, 1); /* Marks FS Dirty */
570 rc = new_size;
571 } else
572 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
573 txEnd(tid);
574 mutex_unlock(&JFS_IP(ip)->commit_mutex);
575 }
576
577 if (ip->i_nlink == 0)
578 set_cflag(COMMIT_Nolink, ip);
579
580 IWRITE_UNLOCK(ip);
581
582 /*
583 * Truncating the directory index table is not guaranteed. It
584 * may need to be done iteratively
585 */
586 if (test_cflag(COMMIT_Stale, dip)) {
587 if (dip->i_size > 1)
588 jfs_truncate_nolock(dip, 0);
589
590 clear_cflag(COMMIT_Stale, dip);
591 }
592
593 out1:
594 free_UCSname(&dname);
595 out:
596 jfs_info("jfs_unlink: rc:%d", rc);
597 return rc;
598 }
599
600 /*
601 * NAME: commitZeroLink()
602 *
603 * FUNCTION: for non-directory, called by jfs_remove(),
604 * truncate a regular file, directory or symbolic
605 * link to zero length. return 0 if type is not
606 * one of these.
607 *
608 * if the file is currently associated with a VM segment
609 * only permanent disk and inode map resources are freed,
610 * and neither the inode nor indirect blocks are modified
611 * so that the resources can be later freed in the work
612 * map by ctrunc1.
613 * if there is no VM segment on entry, the resources are
614 * freed in both work and permanent map.
615 * (? for temporary file - memory object is cached even
616 * after no reference:
617 * reference count > 0 - )
618 *
619 * PARAMETERS: cd - pointer to commit data structure.
620 * current inode is the one to truncate.
621 *
622 * RETURN: Errors from subroutines
623 */
commitZeroLink(tid_t tid,struct inode * ip)624 static s64 commitZeroLink(tid_t tid, struct inode *ip)
625 {
626 int filetype;
627 struct tblock *tblk;
628
629 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
630
631 filetype = ip->i_mode & S_IFMT;
632 switch (filetype) {
633 case S_IFREG:
634 break;
635 case S_IFLNK:
636 /* fast symbolic link */
637 if (ip->i_size < IDATASIZE) {
638 ip->i_size = 0;
639 return 0;
640 }
641 break;
642 default:
643 assert(filetype != S_IFDIR);
644 return 0;
645 }
646
647 set_cflag(COMMIT_Freewmap, ip);
648
649 /* mark transaction of block map update type */
650 tblk = tid_to_tblock(tid);
651 tblk->xflag |= COMMIT_PMAP;
652
653 /*
654 * free EA
655 */
656 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
657 /* acquire maplock on EA to be freed from block map */
658 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
659
660 /*
661 * free ACL
662 */
663 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
664 /* acquire maplock on EA to be freed from block map */
665 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
666
667 /*
668 * free xtree/data (truncate to zero length):
669 * free xtree/data pages from cache if COMMIT_PWMAP,
670 * free xtree/data blocks from persistent block map, and
671 * free xtree/data blocks from working block map if COMMIT_PWMAP;
672 */
673 if (ip->i_size)
674 return xtTruncate_pmap(tid, ip, 0);
675
676 return 0;
677 }
678
679
680 /*
681 * NAME: jfs_free_zero_link()
682 *
683 * FUNCTION: for non-directory, called by iClose(),
684 * free resources of a file from cache and WORKING map
685 * for a file previously committed with zero link count
686 * while associated with a pager object,
687 *
688 * PARAMETER: ip - pointer to inode of file.
689 */
jfs_free_zero_link(struct inode * ip)690 void jfs_free_zero_link(struct inode *ip)
691 {
692 int type;
693
694 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
695
696 /* return if not reg or symbolic link or if size is
697 * already ok.
698 */
699 type = ip->i_mode & S_IFMT;
700
701 switch (type) {
702 case S_IFREG:
703 break;
704 case S_IFLNK:
705 /* if its contained in inode nothing to do */
706 if (ip->i_size < IDATASIZE)
707 return;
708 break;
709 default:
710 return;
711 }
712
713 /*
714 * free EA
715 */
716 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
717 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
718 int xlen = lengthDXD(&JFS_IP(ip)->ea);
719 struct maplock maplock; /* maplock for COMMIT_WMAP */
720 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
721
722 /* free EA pages from cache */
723 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
724
725 /* free EA 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 ACL
736 */
737 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
738 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
739 int xlen = lengthDXD(&JFS_IP(ip)->acl);
740 struct maplock maplock; /* maplock for COMMIT_WMAP */
741 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
742
743 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
744
745 /* free ACL extent from working block map */
746 maplock.index = 1;
747 pxdlock = (struct pxd_lock *) & maplock;
748 pxdlock->flag = mlckFREEPXD;
749 PXDaddress(&pxdlock->pxd, xaddr);
750 PXDlength(&pxdlock->pxd, xlen);
751 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
752 }
753
754 /*
755 * free xtree/data (truncate to zero length):
756 * free xtree/data pages from cache, and
757 * free xtree/data blocks from working block map;
758 */
759 if (ip->i_size)
760 xtTruncate(0, ip, 0, COMMIT_WMAP);
761 }
762
763 /*
764 * NAME: jfs_link(vp, dvp, name, crp)
765 *
766 * FUNCTION: create a link to <vp> by the name = <name>
767 * in the parent directory <dvp>
768 *
769 * PARAMETER: vp - target object
770 * dvp - parent directory of new link
771 * name - name of new link to target object
772 * crp - credential
773 *
774 * RETURN: Errors from subroutines
775 *
776 * note:
777 * JFS does NOT support link() on directories (to prevent circular
778 * path in the directory hierarchy);
779 * EPERM: the target object is a directory, and either the caller
780 * does not have appropriate privileges or the implementation prohibits
781 * using link() on directories [XPG4.2].
782 *
783 * JFS does NOT support links between file systems:
784 * EXDEV: target object and new link are on different file systems and
785 * implementation does not support links between file systems [XPG4.2].
786 */
jfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)787 static int jfs_link(struct dentry *old_dentry,
788 struct inode *dir, struct dentry *dentry)
789 {
790 int rc;
791 tid_t tid;
792 struct inode *ip = d_inode(old_dentry);
793 ino_t ino;
794 struct component_name dname;
795 struct btstack btstack;
796 struct inode *iplist[2];
797
798 jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
799
800 rc = dquot_initialize(dir);
801 if (rc)
802 goto out;
803
804 if (isReadOnly(ip)) {
805 jfs_error(ip->i_sb, "read-only filesystem\n");
806 return -EROFS;
807 }
808
809 tid = txBegin(ip->i_sb, 0);
810
811 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
812 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
813
814 /*
815 * scan parent directory for entry/freespace
816 */
817 if ((rc = get_UCSname(&dname, dentry)))
818 goto out_tx;
819
820 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
821 goto free_dname;
822
823 /*
824 * create entry for new link in parent directory
825 */
826 ino = ip->i_ino;
827 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
828 goto free_dname;
829
830 /* update object inode */
831 inc_nlink(ip); /* for new link */
832 inode_set_ctime_current(ip);
833 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
834 mark_inode_dirty(dir);
835 ihold(ip);
836
837 iplist[0] = ip;
838 iplist[1] = dir;
839 rc = txCommit(tid, 2, &iplist[0], 0);
840
841 if (rc) {
842 drop_nlink(ip); /* never instantiated */
843 iput(ip);
844 } else
845 d_instantiate(dentry, ip);
846
847 free_dname:
848 free_UCSname(&dname);
849
850 out_tx:
851 txEnd(tid);
852
853 mutex_unlock(&JFS_IP(ip)->commit_mutex);
854 mutex_unlock(&JFS_IP(dir)->commit_mutex);
855
856 out:
857 jfs_info("jfs_link: rc:%d", rc);
858 return rc;
859 }
860
861 /*
862 * NAME: jfs_symlink(dip, dentry, name)
863 *
864 * FUNCTION: creates a symbolic link to <symlink> by name <name>
865 * in directory <dip>
866 *
867 * PARAMETER: dip - parent directory vnode
868 * dentry - dentry of symbolic link
869 * name - the path name of the existing object
870 * that will be the source of the link
871 *
872 * RETURN: errors from subroutines
873 *
874 * note:
875 * ENAMETOOLONG: pathname resolution of a symbolic link produced
876 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
877 */
878
jfs_symlink(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,const char * name)879 static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
880 struct dentry *dentry, const char *name)
881 {
882 int rc;
883 tid_t tid;
884 ino_t ino = 0;
885 struct component_name dname;
886 u32 ssize; /* source pathname size */
887 struct btstack btstack;
888 struct inode *ip;
889 s64 xlen = 0;
890 int bmask = 0, xsize;
891 s64 xaddr;
892 struct metapage *mp;
893 struct super_block *sb;
894 struct tblock *tblk;
895
896 struct inode *iplist[2];
897
898 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
899
900 rc = dquot_initialize(dip);
901 if (rc)
902 goto out1;
903
904 ssize = strlen(name) + 1;
905
906 /*
907 * search parent directory for entry/freespace
908 * (dtSearch() returns parent directory page pinned)
909 */
910
911 if ((rc = get_UCSname(&dname, dentry)))
912 goto out1;
913
914 /*
915 * allocate on-disk/in-memory inode for symbolic link:
916 * (iAlloc() returns new, locked inode)
917 */
918 ip = ialloc(dip, S_IFLNK | 0777);
919 if (IS_ERR(ip)) {
920 rc = PTR_ERR(ip);
921 goto out2;
922 }
923
924 tid = txBegin(dip->i_sb, 0);
925
926 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
927 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
928
929 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
930 if (rc)
931 goto out3;
932
933 tblk = tid_to_tblock(tid);
934 tblk->xflag |= COMMIT_CREATE;
935 tblk->ino = ip->i_ino;
936 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
937
938 /* fix symlink access permission
939 * (dir_create() ANDs in the u.u_cmask,
940 * but symlinks really need to be 777 access)
941 */
942 ip->i_mode |= 0777;
943
944 /*
945 * write symbolic link target path name
946 */
947 xtInitRoot(tid, ip);
948
949 /*
950 * write source path name inline in on-disk inode (fast symbolic link)
951 */
952
953 if (ssize <= IDATASIZE) {
954 ip->i_op = &jfs_fast_symlink_inode_operations;
955
956 ip->i_link = JFS_IP(ip)->i_inline_all;
957 memcpy(ip->i_link, name, ssize);
958 ip->i_size = ssize - 1;
959
960 /*
961 * if symlink is > 128 bytes, we don't have the space to
962 * store inline extended attributes
963 */
964 if (ssize > sizeof (JFS_IP(ip)->i_inline))
965 JFS_IP(ip)->mode2 &= ~INLINEEA;
966
967 jfs_info("jfs_symlink: fast symlink added ssize:%u name:%s ",
968 ssize, name);
969 }
970 /*
971 * write source path name in a single extent
972 */
973 else {
974 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
975
976 ip->i_op = &jfs_symlink_inode_operations;
977 inode_nohighmem(ip);
978 ip->i_mapping->a_ops = &jfs_aops;
979
980 /*
981 * even though the data of symlink object (source
982 * path name) is treated as non-journaled user data,
983 * it is read/written thru buffer cache for performance.
984 */
985 sb = ip->i_sb;
986 bmask = JFS_SBI(sb)->bsize - 1;
987 xsize = (ssize + bmask) & ~bmask;
988 xaddr = 0;
989 xlen = xsize >> JFS_SBI(sb)->l2bsize;
990 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
991 txAbort(tid, 0);
992 goto out3;
993 }
994 ip->i_size = ssize - 1;
995 while (ssize) {
996 /* This is kind of silly since PATH_MAX == 4K */
997 u32 copy_size = min_t(u32, ssize, PSIZE);
998
999 mp = get_metapage(ip, xaddr, PSIZE, 1);
1000
1001 if (mp == NULL) {
1002 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1003 rc = -EIO;
1004 txAbort(tid, 0);
1005 goto out3;
1006 }
1007 memcpy(mp->data, name, copy_size);
1008 flush_metapage(mp);
1009 ssize -= copy_size;
1010 name += copy_size;
1011 xaddr += JFS_SBI(sb)->nbperpage;
1012 }
1013 }
1014
1015 /*
1016 * create entry for symbolic link in parent directory
1017 */
1018 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1019 if (rc == 0) {
1020 ino = ip->i_ino;
1021 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1022 }
1023 if (rc) {
1024 if (xlen)
1025 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1026 txAbort(tid, 0);
1027 /* discard new inode */
1028 goto out3;
1029 }
1030
1031 mark_inode_dirty(ip);
1032
1033 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip));
1034 mark_inode_dirty(dip);
1035 /*
1036 * commit update of parent directory and link object
1037 */
1038
1039 iplist[0] = dip;
1040 iplist[1] = ip;
1041 rc = txCommit(tid, 2, &iplist[0], 0);
1042
1043 out3:
1044 txEnd(tid);
1045 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1046 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1047 if (rc) {
1048 free_ea_wmap(ip);
1049 clear_nlink(ip);
1050 discard_new_inode(ip);
1051 } else {
1052 d_instantiate_new(dentry, ip);
1053 }
1054
1055 out2:
1056 free_UCSname(&dname);
1057
1058 out1:
1059 jfs_info("jfs_symlink: rc:%d", rc);
1060 return rc;
1061 }
1062
1063
1064 /*
1065 * NAME: jfs_rename
1066 *
1067 * FUNCTION: rename a file or directory
1068 */
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)1069 static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
1070 struct dentry *old_dentry, struct inode *new_dir,
1071 struct dentry *new_dentry, unsigned int flags)
1072 {
1073 struct btstack btstack;
1074 ino_t ino;
1075 struct component_name new_dname;
1076 struct inode *new_ip;
1077 struct component_name old_dname;
1078 struct inode *old_ip;
1079 int rc;
1080 tid_t tid;
1081 struct tlock *tlck;
1082 struct dt_lock *dtlck;
1083 struct lv *lv;
1084 int ipcount;
1085 struct inode *iplist[4];
1086 struct tblock *tblk;
1087 s64 new_size = 0;
1088 int commit_flag;
1089
1090 if (flags & ~RENAME_NOREPLACE)
1091 return -EINVAL;
1092
1093 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1094
1095 rc = dquot_initialize(old_dir);
1096 if (rc)
1097 goto out1;
1098 rc = dquot_initialize(new_dir);
1099 if (rc)
1100 goto out1;
1101
1102 old_ip = d_inode(old_dentry);
1103 new_ip = d_inode(new_dentry);
1104
1105 if ((rc = get_UCSname(&old_dname, old_dentry)))
1106 goto out1;
1107
1108 if ((rc = get_UCSname(&new_dname, new_dentry)))
1109 goto out2;
1110
1111 /*
1112 * Make sure source inode number is what we think it is
1113 */
1114 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1115 if (rc || (ino != old_ip->i_ino)) {
1116 rc = -ENOENT;
1117 goto out3;
1118 }
1119
1120 /*
1121 * Make sure dest inode number (if any) is what we think it is
1122 */
1123 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1124 if (!rc) {
1125 if ((!new_ip) || (ino != new_ip->i_ino)) {
1126 rc = -ESTALE;
1127 goto out3;
1128 }
1129 } else if (rc != -ENOENT)
1130 goto out3;
1131 else if (new_ip) {
1132 /* no entry exists, but one was expected */
1133 rc = -ESTALE;
1134 goto out3;
1135 }
1136
1137 if (S_ISDIR(old_ip->i_mode)) {
1138 if (new_ip) {
1139 if (!dtEmpty(new_ip)) {
1140 rc = -ENOTEMPTY;
1141 goto out3;
1142 }
1143 }
1144 } else if (new_ip) {
1145 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1146 /* Init inode for quota operations. */
1147 rc = dquot_initialize(new_ip);
1148 if (rc)
1149 goto out_unlock;
1150 }
1151
1152 /*
1153 * The real work starts here
1154 */
1155 tid = txBegin(new_dir->i_sb, 0);
1156
1157 /*
1158 * How do we know the locking is safe from deadlocks?
1159 * The vfs does the hard part for us. Any time we are taking nested
1160 * commit_mutexes, the vfs already has i_mutex held on the parent.
1161 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1162 */
1163 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1164 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1165 if (old_dir != new_dir)
1166 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1167 COMMIT_MUTEX_SECOND_PARENT);
1168
1169 if (new_ip) {
1170 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1171 COMMIT_MUTEX_VICTIM);
1172 /*
1173 * Change existing directory entry to new inode number
1174 */
1175 ino = new_ip->i_ino;
1176 rc = dtModify(tid, new_dir, &new_dname, &ino,
1177 old_ip->i_ino, JFS_RENAME);
1178 if (rc)
1179 goto out_tx;
1180 drop_nlink(new_ip);
1181 if (S_ISDIR(new_ip->i_mode)) {
1182 drop_nlink(new_ip);
1183 if (new_ip->i_nlink) {
1184 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1185 if (old_dir != new_dir)
1186 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1187 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1188 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1189 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1190 IWRITE_UNLOCK(new_ip);
1191 jfs_error(new_ip->i_sb,
1192 "new_ip->i_nlink != 0\n");
1193 return -EIO;
1194 }
1195 tblk = tid_to_tblock(tid);
1196 tblk->xflag |= COMMIT_DELETE;
1197 tblk->u.ip = new_ip;
1198 } else if (new_ip->i_nlink == 0) {
1199 assert(!test_cflag(COMMIT_Nolink, new_ip));
1200 /* free block resources */
1201 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1202 txAbort(tid, 1); /* Marks FS Dirty */
1203 rc = new_size;
1204 goto out_tx;
1205 }
1206 tblk = tid_to_tblock(tid);
1207 tblk->xflag |= COMMIT_DELETE;
1208 tblk->u.ip = new_ip;
1209 } else {
1210 inode_set_ctime_current(new_ip);
1211 mark_inode_dirty(new_ip);
1212 }
1213 } else {
1214 /*
1215 * Add new directory entry
1216 */
1217 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1218 JFS_CREATE);
1219 if (rc) {
1220 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1221 rc);
1222 goto out_tx;
1223 }
1224
1225 ino = old_ip->i_ino;
1226 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1227 if (rc) {
1228 if (rc == -EIO)
1229 jfs_err("jfs_rename: dtInsert returned -EIO");
1230 goto out_tx;
1231 }
1232 if (S_ISDIR(old_ip->i_mode) && old_dir != new_dir)
1233 inc_nlink(new_dir);
1234 }
1235 /*
1236 * Remove old directory entry
1237 */
1238
1239 ino = old_ip->i_ino;
1240 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1241 if (rc) {
1242 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1243 rc);
1244 txAbort(tid, 1); /* Marks Filesystem dirty */
1245 goto out_tx;
1246 }
1247 if (S_ISDIR(old_ip->i_mode)) {
1248 if (new_ip || old_dir != new_dir)
1249 drop_nlink(old_dir);
1250
1251 if (old_dir != new_dir) {
1252 /*
1253 * Change inode number of parent for moved directory
1254 */
1255
1256 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1257 cpu_to_le32(new_dir->i_ino);
1258
1259 /* Linelock header of dtree */
1260 tlck = txLock(tid, old_ip,
1261 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1262 tlckDTREE | tlckBTROOT | tlckRELINK);
1263 dtlck = (struct dt_lock *) & tlck->lock;
1264 ASSERT(dtlck->index == 0);
1265 lv = & dtlck->lv[0];
1266 lv->offset = 0;
1267 lv->length = 1;
1268 dtlck->index++;
1269 }
1270 }
1271
1272 /*
1273 * Update ctime on changed/moved inodes & mark dirty
1274 */
1275 inode_set_ctime_current(old_ip);
1276 mark_inode_dirty(old_ip);
1277
1278 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
1279 mark_inode_dirty(new_dir);
1280
1281 /* Build list of inodes modified by this transaction */
1282 ipcount = 0;
1283 iplist[ipcount++] = old_ip;
1284 if (new_ip)
1285 iplist[ipcount++] = new_ip;
1286 iplist[ipcount++] = old_dir;
1287
1288 if (old_dir != new_dir) {
1289 iplist[ipcount++] = new_dir;
1290 inode_set_mtime_to_ts(old_dir,
1291 inode_set_ctime_current(old_dir));
1292 mark_inode_dirty(old_dir);
1293 }
1294
1295 /*
1296 * Incomplete truncate of file data can
1297 * result in timing problems unless we synchronously commit the
1298 * transaction.
1299 */
1300 if (new_size)
1301 commit_flag = COMMIT_SYNC;
1302 else
1303 commit_flag = 0;
1304
1305 rc = txCommit(tid, ipcount, iplist, commit_flag);
1306
1307 out_tx:
1308 txEnd(tid);
1309 if (new_ip)
1310 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1311 if (old_dir != new_dir)
1312 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1313 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1314 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1315
1316 while (new_size && (rc == 0)) {
1317 tid = txBegin(new_ip->i_sb, 0);
1318 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1319 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1320 if (new_size < 0) {
1321 txAbort(tid, 1);
1322 rc = new_size;
1323 } else
1324 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1325 txEnd(tid);
1326 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1327 }
1328 if (new_ip && (new_ip->i_nlink == 0))
1329 set_cflag(COMMIT_Nolink, new_ip);
1330 /*
1331 * Truncating the directory index table is not guaranteed. It
1332 * may need to be done iteratively
1333 */
1334 if (test_cflag(COMMIT_Stale, old_dir)) {
1335 if (old_dir->i_size > 1)
1336 jfs_truncate_nolock(old_dir, 0);
1337
1338 clear_cflag(COMMIT_Stale, old_dir);
1339 }
1340 out_unlock:
1341 if (new_ip && !S_ISDIR(new_ip->i_mode))
1342 IWRITE_UNLOCK(new_ip);
1343 out3:
1344 free_UCSname(&new_dname);
1345 out2:
1346 free_UCSname(&old_dname);
1347 out1:
1348 jfs_info("jfs_rename: returning %d", rc);
1349 return rc;
1350 }
1351
1352
1353 /*
1354 * NAME: jfs_mknod
1355 *
1356 * FUNCTION: Create a special file (device)
1357 */
jfs_mknod(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)1358 static int jfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1359 struct dentry *dentry, umode_t mode, dev_t rdev)
1360 {
1361 struct jfs_inode_info *jfs_ip;
1362 struct btstack btstack;
1363 struct component_name dname;
1364 ino_t ino;
1365 struct inode *ip;
1366 struct inode *iplist[2];
1367 int rc;
1368 tid_t tid;
1369 struct tblock *tblk;
1370
1371 jfs_info("jfs_mknod: %pd", dentry);
1372
1373 rc = dquot_initialize(dir);
1374 if (rc)
1375 goto out;
1376
1377 if ((rc = get_UCSname(&dname, dentry)))
1378 goto out;
1379
1380 ip = ialloc(dir, mode);
1381 if (IS_ERR(ip)) {
1382 rc = PTR_ERR(ip);
1383 goto out1;
1384 }
1385 jfs_ip = JFS_IP(ip);
1386
1387 tid = txBegin(dir->i_sb, 0);
1388
1389 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1390 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1391
1392 rc = jfs_init_acl(tid, ip, dir);
1393 if (rc)
1394 goto out3;
1395
1396 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1397 if (rc) {
1398 txAbort(tid, 0);
1399 goto out3;
1400 }
1401
1402 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1403 txAbort(tid, 0);
1404 goto out3;
1405 }
1406
1407 tblk = tid_to_tblock(tid);
1408 tblk->xflag |= COMMIT_CREATE;
1409 tblk->ino = ip->i_ino;
1410 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1411
1412 ino = ip->i_ino;
1413 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1414 txAbort(tid, 0);
1415 goto out3;
1416 }
1417
1418 ip->i_op = &jfs_file_inode_operations;
1419 jfs_ip->dev = new_encode_dev(rdev);
1420 init_special_inode(ip, ip->i_mode, rdev);
1421
1422 mark_inode_dirty(ip);
1423
1424 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1425
1426 mark_inode_dirty(dir);
1427
1428 iplist[0] = dir;
1429 iplist[1] = ip;
1430 rc = txCommit(tid, 2, iplist, 0);
1431
1432 out3:
1433 txEnd(tid);
1434 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1435 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1436 if (rc) {
1437 free_ea_wmap(ip);
1438 clear_nlink(ip);
1439 discard_new_inode(ip);
1440 } else {
1441 d_instantiate_new(dentry, ip);
1442 }
1443
1444 out1:
1445 free_UCSname(&dname);
1446
1447 out:
1448 jfs_info("jfs_mknod: returning %d", rc);
1449 return rc;
1450 }
1451
jfs_lookup(struct inode * dip,struct dentry * dentry,unsigned int flags)1452 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1453 {
1454 struct btstack btstack;
1455 ino_t inum;
1456 struct inode *ip;
1457 struct component_name key;
1458 int rc;
1459
1460 jfs_info("jfs_lookup: name = %pd", dentry);
1461
1462 if ((rc = get_UCSname(&key, dentry)))
1463 return ERR_PTR(rc);
1464 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1465 free_UCSname(&key);
1466 if (rc == -ENOENT) {
1467 ip = NULL;
1468 } else if (rc) {
1469 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1470 ip = ERR_PTR(rc);
1471 } else {
1472 ip = jfs_iget(dip->i_sb, inum);
1473 if (IS_ERR(ip))
1474 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1475 }
1476
1477 return d_splice_alias(ip, dentry);
1478 }
1479
jfs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)1480 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1481 u64 ino, u32 generation)
1482 {
1483 struct inode *inode;
1484
1485 if (ino == 0)
1486 return ERR_PTR(-ESTALE);
1487 inode = jfs_iget(sb, ino);
1488 if (IS_ERR(inode))
1489 return ERR_CAST(inode);
1490
1491 if (generation && inode->i_generation != generation) {
1492 iput(inode);
1493 return ERR_PTR(-ESTALE);
1494 }
1495
1496 return inode;
1497 }
1498
jfs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1499 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1500 int fh_len, int fh_type)
1501 {
1502 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1503 jfs_nfs_get_inode);
1504 }
1505
jfs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1506 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1507 int fh_len, int fh_type)
1508 {
1509 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1510 jfs_nfs_get_inode);
1511 }
1512
jfs_get_parent(struct dentry * dentry)1513 struct dentry *jfs_get_parent(struct dentry *dentry)
1514 {
1515 unsigned long parent_ino;
1516
1517 parent_ino =
1518 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1519
1520 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1521 }
1522
1523 const struct inode_operations jfs_dir_inode_operations = {
1524 .create = jfs_create,
1525 .lookup = jfs_lookup,
1526 .link = jfs_link,
1527 .unlink = jfs_unlink,
1528 .symlink = jfs_symlink,
1529 .mkdir = jfs_mkdir,
1530 .rmdir = jfs_rmdir,
1531 .mknod = jfs_mknod,
1532 .rename = jfs_rename,
1533 .listxattr = jfs_listxattr,
1534 .setattr = jfs_setattr,
1535 .fileattr_get = jfs_fileattr_get,
1536 .fileattr_set = jfs_fileattr_set,
1537 #ifdef CONFIG_JFS_POSIX_ACL
1538 .get_inode_acl = jfs_get_acl,
1539 .set_acl = jfs_set_acl,
1540 #endif
1541 };
1542
1543 WRAP_DIR_ITER(jfs_readdir) // FIXME!
1544 const struct file_operations jfs_dir_operations = {
1545 .read = generic_read_dir,
1546 .iterate_shared = shared_jfs_readdir,
1547 .fsync = jfs_fsync,
1548 .unlocked_ioctl = jfs_ioctl,
1549 .compat_ioctl = compat_ptr_ioctl,
1550 .llseek = generic_file_llseek,
1551 .setlease = generic_setlease,
1552 };
1553
jfs_ci_hash(const struct dentry * dir,struct qstr * this)1554 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1555 {
1556 unsigned long hash;
1557 int i;
1558
1559 hash = init_name_hash(dir);
1560 for (i=0; i < this->len; i++)
1561 hash = partial_name_hash(tolower(this->name[i]), hash);
1562 this->hash = end_name_hash(hash);
1563
1564 return 0;
1565 }
1566
jfs_ci_compare(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)1567 static int jfs_ci_compare(const struct dentry *dentry,
1568 unsigned int len, const char *str, const struct qstr *name)
1569 {
1570 int i, result = 1;
1571
1572 if (len != name->len)
1573 goto out;
1574 for (i=0; i < len; i++) {
1575 if (tolower(str[i]) != tolower(name->name[i]))
1576 goto out;
1577 }
1578 result = 0;
1579 out:
1580 return result;
1581 }
1582
jfs_ci_revalidate(struct inode * dir,const struct qstr * name,struct dentry * dentry,unsigned int flags)1583 static int jfs_ci_revalidate(struct inode *dir, const struct qstr *name,
1584 struct dentry *dentry, unsigned int flags)
1585 {
1586 /*
1587 * This is not negative dentry. Always valid.
1588 *
1589 * Note, rename() to existing directory entry will have ->d_inode,
1590 * and will use existing name which isn't specified name by user.
1591 *
1592 * We may be able to drop this positive dentry here. But dropping
1593 * positive dentry isn't good idea. So it's unsupported like
1594 * rename("filename", "FILENAME") for now.
1595 */
1596 if (d_really_is_positive(dentry))
1597 return 1;
1598
1599 /*
1600 * This may be nfsd (or something), anyway, we can't see the
1601 * intent of this. So, since this can be for creation, drop it.
1602 */
1603 if (!flags)
1604 return 0;
1605
1606 /*
1607 * Drop the negative dentry, in order to make sure to use the
1608 * case sensitive name which is specified by user if this is
1609 * for creation.
1610 */
1611 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1612 return 0;
1613 return 1;
1614 }
1615
1616 const struct dentry_operations jfs_ci_dentry_operations =
1617 {
1618 .d_hash = jfs_ci_hash,
1619 .d_compare = jfs_ci_compare,
1620 .d_revalidate = jfs_ci_revalidate,
1621 };
1622