xref: /linux/fs/jfs/namei.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
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 	inode_set_mtime_to_ts(dip, 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 	inode_set_mtime_to_ts(dip, 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 	inode_set_mtime_to_ts(dip, 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 	inode_set_mtime_to_ts(dip,
516 			      inode_set_ctime_to_ts(dip, inode_set_ctime_current(ip)));
517 	mark_inode_dirty(dip);
518 
519 	/* update target's inode */
520 	inode_dec_link_count(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(&JFS_IP(ip)->commit_mutex);
532 			mutex_unlock(&JFS_IP(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(&JFS_IP(ip)->commit_mutex);
561 	mutex_unlock(&JFS_IP(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, 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(&JFS_IP(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  */
commitZeroLink(tid_t tid,struct inode * ip)623 static 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(ip)->ea.flag & DXD_EXTENT)
656 		/* acquire maplock on EA to be freed from block map */
657 		txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
658 
659 	/*
660 	 * free ACL
661 	 */
662 	if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
663 		/* acquire maplock on EA to be freed from block map */
664 		txEA(tid, ip, &JFS_IP(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, 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  */
jfs_free_zero_link(struct inode * ip)689 void 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(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(&pxdlock->pxd, xaddr);
729 		PXDlength(&pxdlock->pxd, xlen);
730 		txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
731 	}
732 
733 	/*
734 	 * free ACL
735 	 */
736 	if (JFS_IP(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(&pxdlock->pxd, xaddr);
749 		PXDlength(&pxdlock->pxd, 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(0, ip, 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  */
jfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)786 static 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(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(dir);
800 	if (rc)
801 		goto out;
802 
803 	if (isReadOnly(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(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
811 	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
812 
813 	/*
814 	 * scan parent directory for entry/freespace
815 	 */
816 	if ((rc = get_UCSname(&dname, dentry)))
817 		goto out_tx;
818 
819 	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
820 		goto free_dname;
821 
822 	/*
823 	 * create entry for new link in parent directory
824 	 */
825 	ino = ip->i_ino;
826 	if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
827 		goto free_dname;
828 
829 	/* update object inode */
830 	inc_nlink(ip);		/* for new link */
831 	inode_set_ctime_current(ip);
832 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
833 	mark_inode_dirty(dir);
834 	ihold(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(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(&JFS_IP(ip)->commit_mutex);
853 	mutex_unlock(&JFS_IP(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 
jfs_symlink(struct mnt_idmap * idmap,struct inode * dip,struct dentry * dentry,const char * name)878 static 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(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(ip)) {
919 		rc = PTR_ERR(ip);
920 		goto out2;
921 	}
922 
923 	tid = txBegin(dip->i_sb, 0);
924 
925 	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
926 	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, 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(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(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(ip)->i_inline))
964 			JFS_IP(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(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, 0, 0, xlen, &xaddr, 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, 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(dip, &dname, &ino, &btstack, JFS_CREATE);
1018 	if (rc == 0) {
1019 		ino = ip->i_ino;
1020 		rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1021 	}
1022 	if (rc) {
1023 		if (xlen)
1024 			xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1025 		txAbort(tid, 0);
1026 		/* discard new inode */
1027 		goto out3;
1028 	}
1029 
1030 	mark_inode_dirty(ip);
1031 
1032 	inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip));
1033 	mark_inode_dirty(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(&JFS_IP(ip)->commit_mutex);
1045 	mutex_unlock(&JFS_IP(dip)->commit_mutex);
1046 	if (rc) {
1047 		free_ea_wmap(ip);
1048 		clear_nlink(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  */
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)1068 static 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(old_dir);
1095 	if (rc)
1096 		goto out1;
1097 	rc = dquot_initialize(new_dir);
1098 	if (rc)
1099 		goto out1;
1100 
1101 	old_ip = d_inode(old_dentry);
1102 	new_ip = d_inode(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(old_dir, &old_dname, &ino, &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(new_dir, &new_dname, &ino, &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(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(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1163 	mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1164 	if (old_dir != new_dir)
1165 		mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1166 				  COMMIT_MUTEX_SECOND_PARENT);
1167 
1168 	if (new_ip) {
1169 		mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1170 				  COMMIT_MUTEX_VICTIM);
1171 		/*
1172 		 * Change existing directory entry to new inode number
1173 		 */
1174 		ino = new_ip->i_ino;
1175 		rc = dtModify(tid, new_dir, &new_dname, &ino,
1176 			      old_ip->i_ino, JFS_RENAME);
1177 		if (rc)
1178 			goto out_tx;
1179 		drop_nlink(new_ip);
1180 		if (S_ISDIR(new_ip->i_mode)) {
1181 			drop_nlink(new_ip);
1182 			if (new_ip->i_nlink) {
1183 				mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1184 				if (old_dir != new_dir)
1185 					mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1186 				mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1187 				mutex_unlock(&JFS_IP(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, 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(new_ip);
1210 			mark_inode_dirty(new_ip);
1211 		}
1212 	} else {
1213 		/*
1214 		 * Add new directory entry
1215 		 */
1216 		rc = dtSearch(new_dir, &new_dname, &ino, &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, new_dir, &new_dname, &ino, &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(new_dir);
1233 	}
1234 	/*
1235 	 * Remove old directory entry
1236 	 */
1237 
1238 	ino = old_ip->i_ino;
1239 	rc = dtDelete(tid, old_dir, &old_dname, &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(old_dir);
1248 		if (old_dir != new_dir) {
1249 			/*
1250 			 * Change inode number of parent for moved directory
1251 			 */
1252 
1253 			JFS_IP(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(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(old_ip);
1273 	mark_inode_dirty(old_ip);
1274 
1275 	inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
1276 	mark_inode_dirty(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(old_dir,
1288 				      inode_set_ctime_current(old_dir));
1289 		mark_inode_dirty(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(&JFS_IP(new_ip)->commit_mutex);
1308 	if (old_dir != new_dir)
1309 		mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1310 	mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1311 	mutex_unlock(&JFS_IP(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, new_ip, 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(&JFS_IP(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  */
jfs_mknod(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)1355 static 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(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(ip)) {
1379 		rc = PTR_ERR(ip);
1380 		goto out1;
1381 	}
1382 	jfs_ip = JFS_IP(ip);
1383 
1384 	tid = txBegin(dir->i_sb, 0);
1385 
1386 	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1387 	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, 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(dir, &dname, &ino, &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(ip)->ixpxd;
1408 
1409 	ino = ip->i_ino;
1410 	if ((rc = dtInsert(tid, dir, &dname, &ino, &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(rdev);
1417 	init_special_inode(ip, ip->i_mode, rdev);
1418 
1419 	mark_inode_dirty(ip);
1420 
1421 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1422 
1423 	mark_inode_dirty(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(&JFS_IP(ip)->commit_mutex);
1432 	mutex_unlock(&JFS_IP(dir)->commit_mutex);
1433 	if (rc) {
1434 		free_ea_wmap(ip);
1435 		clear_nlink(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 
jfs_lookup(struct inode * dip,struct dentry * dentry,unsigned int flags)1449 static 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(rc);
1461 	rc = dtSearch(dip, &key, &inum, &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(rc);
1468 	} else {
1469 		ip = jfs_iget(dip->i_sb, inum);
1470 		if (IS_ERR(ip))
1471 			jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1472 	}
1473 
1474 	return d_splice_alias(ip, dentry);
1475 }
1476 
jfs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)1477 static 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(-ESTALE);
1484 	inode = jfs_iget(sb, ino);
1485 	if (IS_ERR(inode))
1486 		return ERR_CAST(inode);
1487 
1488 	if (generation && inode->i_generation != generation) {
1489 		iput(inode);
1490 		return ERR_PTR(-ESTALE);
1491 	}
1492 
1493 	return inode;
1494 }
1495 
jfs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1496 struct 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 				    jfs_nfs_get_inode);
1501 }
1502 
jfs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1503 struct 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 				    jfs_nfs_get_inode);
1508 }
1509 
jfs_get_parent(struct dentry * dentry)1510 struct 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 
1520 const 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 
1540 WRAP_DIR_ITER(jfs_readdir) // FIXME!
1541 const 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 
jfs_ci_hash(const struct dentry * dir,struct qstr * this)1550 static 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]), hash);
1558 	this->hash = end_name_hash(hash);
1559 
1560 	return 0;
1561 }
1562 
jfs_ci_compare(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)1563 static 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;
1575 out:
1576 	return result;
1577 }
1578 
jfs_ci_revalidate(struct dentry * dentry,unsigned int flags)1579 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1580 {
1581 	/*
1582 	 * This is not negative dentry. Always valid.
1583 	 *
1584 	 * Note, rename() to existing directory entry will have ->d_inode,
1585 	 * and will use existing name which isn't specified name by user.
1586 	 *
1587 	 * We may be able to drop this positive dentry here. But dropping
1588 	 * positive dentry isn't good idea. So it's unsupported like
1589 	 * rename("filename", "FILENAME") for now.
1590 	 */
1591 	if (d_really_is_positive(dentry))
1592 		return 1;
1593 
1594 	/*
1595 	 * This may be nfsd (or something), anyway, we can't see the
1596 	 * intent of this. So, since this can be for creation, drop it.
1597 	 */
1598 	if (!flags)
1599 		return 0;
1600 
1601 	/*
1602 	 * Drop the negative dentry, in order to make sure to use the
1603 	 * case sensitive name which is specified by user if this is
1604 	 * for creation.
1605 	 */
1606 	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1607 		return 0;
1608 	return 1;
1609 }
1610 
1611 const struct dentry_operations jfs_ci_dentry_operations =
1612 {
1613 	.d_hash = jfs_ci_hash,
1614 	.d_compare = jfs_ci_compare,
1615 	.d_revalidate = jfs_ci_revalidate,
1616 };
1617