1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* Copyright (C) International Business Machines Corp., 2000-2004
4	*/
5
6	/*
7	* jfs_imap.c: inode allocation map manager
8	*
9	* Serialization:
10	* Each AG has a simple lock which is used to control the serialization of
11	* the AG level lists. This lock should be taken first whenever an AG
12	* level list will be modified or accessed.
13	*
14	* Each IAG is locked by obtaining the buffer for the IAG page.
15	*
16	* There is also a inode lock for the inode map inode. A read lock needs to
17	* be taken whenever an IAG is read from the map or the global level
18	* information is read. A write lock needs to be taken whenever the global
19	* level information is modified or an atomic operation needs to be used.
20	*
21	* If more than one IAG is read at one time, the read lock may not
22	* be given up until all of the IAG's are read. Otherwise, a deadlock
23	* may occur when trying to obtain the read lock while another thread
24	* holding the read lock is waiting on the IAG already being held.
25	*
26	* The control page of the inode map is read into memory by diMount().
27	* Thereafter it should only be modified in memory and then it will be
28	* written out when the filesystem is unmounted by diUnmount().
29	*/
30
31	#include <linux/fs.h>
32	#include <linux/buffer_head.h>
33	#include <linux/pagemap.h>
34	#include <linux/quotaops.h>
35	#include <linux/slab.h>
36
37	#include "jfs_incore.h"
38	#include "jfs_inode.h"
39	#include "jfs_filsys.h"
40	#include "jfs_dinode.h"
41	#include "jfs_dmap.h"
42	#include "jfs_imap.h"
43	#include "jfs_metapage.h"
44	#include "jfs_superblock.h"
45	#include "jfs_debug.h"
46
47	/*
48	* imap locks
49	*/
50	/* iag free list lock */
51	#define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock)
52	#define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock)
53	#define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock)
54
55	/* per ag iag list locks */
56	#define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index]))
57	#define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno])
58	#define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno])
59
60	/*
61	* forward references
62	*/
63	static int diAllocAG(struct inomap *, int, bool, struct inode *);
64	static int diAllocAny(struct inomap *, int, bool, struct inode *);
65	static int diAllocBit(struct inomap *, struct iag *, int);
66	static int diAllocExt(struct inomap *, int, struct inode *);
67	static int diAllocIno(struct inomap *, int, struct inode *);
68	static int diFindFree(u32, int);
69	static int diNewExt(struct inomap *, struct iag *, int);
70	static int diNewIAG(struct inomap *, int *, int, struct metapage **);
71	static void duplicateIXtree(struct super_block *, s64, int, s64 *);
72
73	static int diIAGRead(struct inomap * imap, int, struct metapage **);
74	static int copy_from_dinode(struct dinode *, struct inode *);
75	static void copy_to_dinode(struct dinode *, struct inode *);
76
77	/*
78	* NAME: diMount()
79	*
80	* FUNCTION: initialize the incore inode map control structures for
81	* a fileset or aggregate init time.
82	*
83	* the inode map's control structure (dinomap) is
84	* brought in from disk and placed in virtual memory.
85	*
86	* PARAMETERS:
87	* ipimap - pointer to inode map inode for the aggregate or fileset.
88	*
89	* RETURN VALUES:
90	* 0 - success
91	* -ENOMEM - insufficient free virtual memory.
92	* -EIO - i/o error.
93	*/
94	int diMount(struct inode *ipimap)
95	{
96	struct inomap *imap;
97	struct metapage *mp;
98	int index;
99	struct dinomap_disk *dinom_le;
100
101	/*
102	* allocate/initialize the in-memory inode map control structure
103	*/
104	/* allocate the in-memory inode map control structure. */
105	imap = kmalloc(size: sizeof(struct inomap), GFP_KERNEL);
106	if (imap == NULL)
107	return -ENOMEM;
108
109	/* read the on-disk inode map control structure. */
110
111	mp = read_metapage(ipimap,
112	IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
113	PSIZE, 0);
114	if (mp == NULL) {
115	kfree(objp: imap);
116	return -EIO;
117	}
118
119	/* copy the on-disk version to the in-memory version. */
120	dinom_le = (struct dinomap_disk *) mp->data;
121	imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
122	imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
123	atomic_set(v: &imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
124	atomic_set(v: &imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
125	imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
126	imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
127	for (index = 0; index < MAXAG; index++) {
128	imap->im_agctl[index].inofree =
129	le32_to_cpu(dinom_le->in_agctl[index].inofree);
130	imap->im_agctl[index].extfree =
131	le32_to_cpu(dinom_le->in_agctl[index].extfree);
132	imap->im_agctl[index].numinos =
133	le32_to_cpu(dinom_le->in_agctl[index].numinos);
134	imap->im_agctl[index].numfree =
135	le32_to_cpu(dinom_le->in_agctl[index].numfree);
136	}
137
138	/* release the buffer. */
139	release_metapage(mp);
140
141	/*
142	* allocate/initialize inode allocation map locks
143	*/
144	/* allocate and init iag free list lock */
145	IAGFREE_LOCK_INIT(imap);
146
147	/* allocate and init ag list locks */
148	for (index = 0; index < MAXAG; index++) {
149	AG_LOCK_INIT(imap, index);
150	}
151
152	/* bind the inode map inode and inode map control structure
153	* to each other.
154	*/
155	imap->im_ipimap = ipimap;
156	JFS_IP(inode: ipimap)->i_imap = imap;
157
158	return (0);
159	}
160
161
162	/*
163	* NAME: diUnmount()
164	*
165	* FUNCTION: write to disk the incore inode map control structures for
166	* a fileset or aggregate at unmount time.
167	*
168	* PARAMETERS:
169	* ipimap - pointer to inode map inode for the aggregate or fileset.
170	*
171	* RETURN VALUES:
172	* 0 - success
173	* -ENOMEM - insufficient free virtual memory.
174	* -EIO - i/o error.
175	*/
176	int diUnmount(struct inode *ipimap, int mounterror)
177	{
178	struct inomap *imap = JFS_IP(inode: ipimap)->i_imap;
179
180	/*
181	* update the on-disk inode map control structure
182	*/
183
184	if (!(mounterror || isReadOnly(inode: ipimap)))
185	diSync(ipimap);
186
187	/*
188	* Invalidate the page cache buffers
189	*/
190	truncate_inode_pages(ipimap->i_mapping, 0);
191
192	/*
193	* free in-memory control structure
194	*/
195	kfree(objp: imap);
196	JFS_IP(inode: ipimap)->i_imap = NULL;
197
198	return (0);
199	}
200
201
202	/*
203	* diSync()
204	*/
205	int diSync(struct inode *ipimap)
206	{
207	struct dinomap_disk *dinom_le;
208	struct inomap *imp = JFS_IP(inode: ipimap)->i_imap;
209	struct metapage *mp;
210	int index;
211
212	/*
213	* write imap global conrol page
214	*/
215	/* read the on-disk inode map control structure */
216	mp = get_metapage(ipimap,
217	IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
218	PSIZE, 0);
219	if (mp == NULL) {
220	jfs_err("diSync: get_metapage failed!");
221	return -EIO;
222	}
223
224	/* copy the in-memory version to the on-disk version */
225	dinom_le = (struct dinomap_disk *) mp->data;
226	dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
227	dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
228	dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
229	dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
230	dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
231	dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
232	for (index = 0; index < MAXAG; index++) {
233	dinom_le->in_agctl[index].inofree =
234	cpu_to_le32(imp->im_agctl[index].inofree);
235	dinom_le->in_agctl[index].extfree =
236	cpu_to_le32(imp->im_agctl[index].extfree);
237	dinom_le->in_agctl[index].numinos =
238	cpu_to_le32(imp->im_agctl[index].numinos);
239	dinom_le->in_agctl[index].numfree =
240	cpu_to_le32(imp->im_agctl[index].numfree);
241	}
242
243	/* write out the control structure */
244	write_metapage(mp);
245
246	/*
247	* write out dirty pages of imap
248	*/
249	filemap_write_and_wait(mapping: ipimap->i_mapping);
250
251	diWriteSpecial(ipimap, 0);
252
253	return (0);
254	}
255
256
257	/*
258	* NAME: diRead()
259	*
260	* FUNCTION: initialize an incore inode from disk.
261	*
262	* on entry, the specifed incore inode should itself
263	* specify the disk inode number corresponding to the
264	* incore inode (i.e. i_number should be initialized).
265	*
266	* this routine handles incore inode initialization for
267	* both "special" and "regular" inodes. special inodes
268	* are those required early in the mount process and
269	* require special handling since much of the file system
270	* is not yet initialized. these "special" inodes are
271	* identified by a NULL inode map inode pointer and are
272	* actually initialized by a call to diReadSpecial().
273	*
274	* for regular inodes, the iag describing the disk inode
275	* is read from disk to determine the inode extent address
276	* for the disk inode. with the inode extent address in
277	* hand, the page of the extent that contains the disk
278	* inode is read and the disk inode is copied to the
279	* incore inode.
280	*
281	* PARAMETERS:
282	* ip - pointer to incore inode to be initialized from disk.
283	*
284	* RETURN VALUES:
285	* 0 - success
286	* -EIO - i/o error.
287	* -ENOMEM - insufficient memory
288	*
289	*/
290	int diRead(struct inode *ip)
291	{
292	struct jfs_sb_info *sbi = JFS_SBI(sb: ip->i_sb);
293	int iagno, ino, extno, rc;
294	struct inode *ipimap;
295	struct dinode *dp;
296	struct iag *iagp;
297	struct metapage *mp;
298	s64 blkno, agstart;
299	struct inomap *imap;
300	int block_offset;
301	int inodes_left;
302	unsigned long pageno;
303	int rel_inode;
304
305	jfs_info("diRead: ino = %ld", ip->i_ino);
306
307	ipimap = sbi->ipimap;
308	JFS_IP(inode: ip)->ipimap = ipimap;
309
310	/* determine the iag number for this inode (number) */
311	iagno = INOTOIAG(ip->i_ino);
312
313	/* read the iag */
314	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
315	imap = JFS_IP(inode: ipimap)->i_imap;
316	rc = diIAGRead(imap, iagno, &mp);
317	IREAD_UNLOCK(ipimap);
318	if (rc) {
319	jfs_err("diRead: diIAGRead returned %d", rc);
320	return (rc);
321	}
322
323	iagp = (struct iag *) mp->data;
324
325	/* determine inode extent that holds the disk inode */
326	ino = ip->i_ino & (INOSPERIAG - 1);
327	extno = ino >> L2INOSPEREXT;
328
329	if ((lengthPXD(pxd: &iagp->inoext[extno]) != imap->im_nbperiext) ||
330	(addressPXD(pxd: &iagp->inoext[extno]) == 0)) {
331	release_metapage(mp);
332	return -ESTALE;
333	}
334
335	/* get disk block number of the page within the inode extent
336	* that holds the disk inode.
337	*/
338	blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);
339
340	/* get the ag for the iag */
341	agstart = le64_to_cpu(iagp->agstart);
342
343	release_metapage(mp);
344
345	rel_inode = (ino & (INOSPERPAGE - 1));
346	pageno = blkno >> sbi->l2nbperpage;
347
348	if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
349	/*
350	* OS/2 didn't always align inode extents on page boundaries
351	*/
352	inodes_left =
353	(sbi->nbperpage - block_offset) << sbi->l2niperblk;
354
355	if (rel_inode < inodes_left)
356	rel_inode += block_offset << sbi->l2niperblk;
357	else {
358	pageno += 1;
359	rel_inode -= inodes_left;
360	}
361	}
362
363	/* read the page of disk inode */
364	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
365	if (!mp) {
366	jfs_err("diRead: read_metapage failed");
367	return -EIO;
368	}
369
370	/* locate the disk inode requested */
371	dp = (struct dinode *) mp->data;
372	dp += rel_inode;
373
374	if (ip->i_ino != le32_to_cpu(dp->di_number)) {
375	jfs_error(ip->i_sb, "i_ino != di_number\n");
376	rc = -EIO;
377	} else if (le32_to_cpu(dp->di_nlink) == 0)
378	rc = -ESTALE;
379	else
380	/* copy the disk inode to the in-memory inode */
381	rc = copy_from_dinode(dp, ip);
382
383	release_metapage(mp);
384
385	/* set the ag for the inode */
386	JFS_IP(inode: ip)->agstart = agstart;
387	JFS_IP(inode: ip)->active_ag = -1;
388
389	return (rc);
390	}
391
392
393	/*
394	* NAME: diReadSpecial()
395	*
396	* FUNCTION: initialize a 'special' inode from disk.
397	*
398	* this routines handles aggregate level inodes. The
399	* inode cache cannot differentiate between the
400	* aggregate inodes and the filesystem inodes, so we
401	* handle these here. We don't actually use the aggregate
402	* inode map, since these inodes are at a fixed location
403	* and in some cases the aggregate inode map isn't initialized
404	* yet.
405	*
406	* PARAMETERS:
407	* sb - filesystem superblock
408	* inum - aggregate inode number
409	* secondary - 1 if secondary aggregate inode table
410	*
411	* RETURN VALUES:
412	* new inode - success
413	* NULL - i/o error.
414	*/
415	struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
416	{
417	struct jfs_sb_info *sbi = JFS_SBI(sb);
418	uint address;
419	struct dinode *dp;
420	struct inode *ip;
421	struct metapage *mp;
422
423	ip = new_inode(sb);
424	if (ip == NULL) {
425	jfs_err("diReadSpecial: new_inode returned NULL!");
426	return ip;
427	}
428
429	if (secondary) {
430	address = addressPXD(pxd: &sbi->ait2) >> sbi->l2nbperpage;
431	JFS_IP(inode: ip)->ipimap = sbi->ipaimap2;
432	} else {
433	address = AITBL_OFF >> L2PSIZE;
434	JFS_IP(inode: ip)->ipimap = sbi->ipaimap;
435	}
436
437	ASSERT(inum < INOSPEREXT);
438
439	ip->i_ino = inum;
440
441	address += inum >> 3; /* 8 inodes per 4K page */
442
443	/* read the page of fixed disk inode (AIT) in raw mode */
444	mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
445	if (mp == NULL) {
446	set_nlink(inode: ip, nlink: 1); /* Don't want iput() deleting it */
447	iput(ip);
448	return (NULL);
449	}
450
451	/* get the pointer to the disk inode of interest */
452	dp = (struct dinode *) (mp->data);
453	dp += inum % 8; /* 8 inodes per 4K page */
454
455	/* copy on-disk inode to in-memory inode */
456	if ((copy_from_dinode(dp, ip)) != 0) {
457	/* handle bad return by returning NULL for ip */
458	set_nlink(inode: ip, nlink: 1); /* Don't want iput() deleting it */
459	iput(ip);
460	/* release the page */
461	release_metapage(mp);
462	return (NULL);
463
464	}
465
466	ip->i_mapping->a_ops = &jfs_metapage_aops;
467	mapping_set_gfp_mask(m: ip->i_mapping, GFP_NOFS);
468
469	/* Allocations to metadata inodes should not affect quotas */
470	ip->i_flags |= S_NOQUOTA;
471
472	if ((inum == FILESYSTEM_I) && (JFS_IP(inode: ip)->ipimap == sbi->ipaimap)) {
473	sbi->gengen = le32_to_cpu(dp->di_gengen);
474	sbi->inostamp = le32_to_cpu(dp->di_inostamp);
475	}
476
477	/* release the page */
478	release_metapage(mp);
479
480	inode_fake_hash(inode: ip);
481
482	return (ip);
483	}
484
485	/*
486	* NAME: diWriteSpecial()
487	*
488	* FUNCTION: Write the special inode to disk
489	*
490	* PARAMETERS:
491	* ip - special inode
492	* secondary - 1 if secondary aggregate inode table
493	*
494	* RETURN VALUES: none
495	*/
496
497	void diWriteSpecial(struct inode *ip, int secondary)
498	{
499	struct jfs_sb_info *sbi = JFS_SBI(sb: ip->i_sb);
500	uint address;
501	struct dinode *dp;
502	ino_t inum = ip->i_ino;
503	struct metapage *mp;
504
505	if (secondary)
506	address = addressPXD(pxd: &sbi->ait2) >> sbi->l2nbperpage;
507	else
508	address = AITBL_OFF >> L2PSIZE;
509
510	ASSERT(inum < INOSPEREXT);
511
512	address += inum >> 3; /* 8 inodes per 4K page */
513
514	/* read the page of fixed disk inode (AIT) in raw mode */
515	mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
516	if (mp == NULL) {
517	jfs_err("diWriteSpecial: failed to read aggregate inode extent!");
518	return;
519	}
520
521	/* get the pointer to the disk inode of interest */
522	dp = (struct dinode *) (mp->data);
523	dp += inum % 8; /* 8 inodes per 4K page */
524
525	/* copy on-disk inode to in-memory inode */
526	copy_to_dinode(dp, ip);
527	memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
528
529	if (inum == FILESYSTEM_I)
530	dp->di_gengen = cpu_to_le32(sbi->gengen);
531
532	/* write the page */
533	write_metapage(mp);
534	}
535
536	/*
537	* NAME: diFreeSpecial()
538	*
539	* FUNCTION: Free allocated space for special inode
540	*/
541	void diFreeSpecial(struct inode *ip)
542	{
543	if (ip == NULL) {
544	jfs_err("diFreeSpecial called with NULL ip!");
545	return;
546	}
547	filemap_write_and_wait(mapping: ip->i_mapping);
548	truncate_inode_pages(ip->i_mapping, 0);
549	iput(ip);
550	}
551
552
553
554	/*
555	* NAME: diWrite()
556	*
557	* FUNCTION: write the on-disk inode portion of the in-memory inode
558	* to its corresponding on-disk inode.
559	*
560	* on entry, the specifed incore inode should itself
561	* specify the disk inode number corresponding to the
562	* incore inode (i.e. i_number should be initialized).
563	*
564	* the inode contains the inode extent address for the disk
565	* inode. with the inode extent address in hand, the
566	* page of the extent that contains the disk inode is
567	* read and the disk inode portion of the incore inode
568	* is copied to the disk inode.
569	*
570	* PARAMETERS:
571	* tid - transacation id
572	* ip - pointer to incore inode to be written to the inode extent.
573	*
574	* RETURN VALUES:
575	* 0 - success
576	* -EIO - i/o error.
577	*/
578	int diWrite(tid_t tid, struct inode *ip)
579	{
580	struct jfs_sb_info *sbi = JFS_SBI(sb: ip->i_sb);
581	struct jfs_inode_info *jfs_ip = JFS_IP(inode: ip);
582	int rc = 0;
583	s32 ino;
584	struct dinode *dp;
585	s64 blkno;
586	int block_offset;
587	int inodes_left;
588	struct metapage *mp;
589	unsigned long pageno;
590	int rel_inode;
591	int dioffset;
592	struct inode *ipimap;
593	uint type;
594	lid_t lid;
595	struct tlock *ditlck, *tlck;
596	struct linelock *dilinelock, *ilinelock;
597	struct lv *lv;
598	int n;
599
600	ipimap = jfs_ip->ipimap;
601
602	ino = ip->i_ino & (INOSPERIAG - 1);
603
604	if (!addressPXD(pxd: &(jfs_ip->ixpxd)) ||
605	(lengthPXD(pxd: &(jfs_ip->ixpxd)) !=
606	JFS_IP(inode: ipimap)->i_imap->im_nbperiext)) {
607	jfs_error(ip->i_sb, "ixpxd invalid\n");
608	return -EIO;
609	}
610
611	/*
612	* read the page of disk inode containing the specified inode:
613	*/
614	/* compute the block address of the page */
615	blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
616
617	rel_inode = (ino & (INOSPERPAGE - 1));
618	pageno = blkno >> sbi->l2nbperpage;
619
620	if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
621	/*
622	* OS/2 didn't always align inode extents on page boundaries
623	*/
624	inodes_left =
625	(sbi->nbperpage - block_offset) << sbi->l2niperblk;
626
627	if (rel_inode < inodes_left)
628	rel_inode += block_offset << sbi->l2niperblk;
629	else {
630	pageno += 1;
631	rel_inode -= inodes_left;
632	}
633	}
634	/* read the page of disk inode */
635	retry:
636	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
637	if (!mp)
638	return -EIO;
639
640	/* get the pointer to the disk inode */
641	dp = (struct dinode *) mp->data;
642	dp += rel_inode;
643
644	dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
645
646	/*
647	* acquire transaction lock on the on-disk inode;
648	* N.B. tlock is acquired on ipimap not ip;
649	*/
650	if ((ditlck =
651	txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
652	goto retry;
653	dilinelock = (struct linelock *) & ditlck->lock;
654
655	/*
656	* copy btree root from in-memory inode to on-disk inode
657	*
658	* (tlock is taken from inline B+-tree root in in-memory
659	* inode when the B+-tree root is updated, which is pointed
660	* by jfs_ip->blid as well as being on tx tlock list)
661	*
662	* further processing of btree root is based on the copy
663	* in in-memory inode, where txLog() will log from, and,
664	* for xtree root, txUpdateMap() will update map and reset
665	* XAD_NEW bit;
666	*/
667
668	if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
669	/*
670	* This is the special xtree inside the directory for storing
671	* the directory table
672	*/
673	xtroot_t *p, *xp;
674	xad_t *xad;
675
676	jfs_ip->xtlid = 0;
677	tlck = lid_to_tlock(lid);
678	assert(tlck->type & tlckXTREE);
679	tlck->type |= tlckBTROOT;
680	tlck->mp = mp;
681	ilinelock = (struct linelock *) & tlck->lock;
682
683	/*
684	* copy xtree root from inode to dinode:
685	*/
686	p = &jfs_ip->i_xtroot;
687	xp = (xtroot_t *) &dp->di_dirtable;
688	lv = ilinelock->lv;
689	for (n = 0; n < ilinelock->index; n++, lv++) {
690	memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
691	lv->length << L2XTSLOTSIZE);
692	}
693
694	/* reset on-disk (metadata page) xtree XAD_NEW bit */
695	xad = &xp->xad[XTENTRYSTART];
696	for (n = XTENTRYSTART;
697	n < le16_to_cpu(xp->header.nextindex); n++, xad++)
698	if (xad->flag & (XAD_NEW | XAD_EXTENDED))
699	xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
700	}
701
702	if ((lid = jfs_ip->blid) == 0)
703	goto inlineData;
704	jfs_ip->blid = 0;
705
706	tlck = lid_to_tlock(lid);
707	type = tlck->type;
708	tlck->type |= tlckBTROOT;
709	tlck->mp = mp;
710	ilinelock = (struct linelock *) & tlck->lock;
711
712	/*
713	* regular file: 16 byte (XAD slot) granularity
714	*/
715	if (type & tlckXTREE) {
716	xtroot_t *p, *xp;
717	xad_t *xad;
718
719	/*
720	* copy xtree root from inode to dinode:
721	*/
722	p = &jfs_ip->i_xtroot;
723	xp = &dp->di_xtroot;
724	lv = ilinelock->lv;
725	for (n = 0; n < ilinelock->index; n++, lv++) {
726	memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
727	lv->length << L2XTSLOTSIZE);
728	}
729
730	/* reset on-disk (metadata page) xtree XAD_NEW bit */
731	xad = &xp->xad[XTENTRYSTART];
732	for (n = XTENTRYSTART;
733	n < le16_to_cpu(xp->header.nextindex); n++, xad++)
734	if (xad->flag & (XAD_NEW | XAD_EXTENDED))
735	xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
736	}
737	/*
738	* directory: 32 byte (directory entry slot) granularity
739	*/
740	else if (type & tlckDTREE) {
741	dtpage_t *p, *xp;
742
743	/*
744	* copy dtree root from inode to dinode:
745	*/
746	p = (dtpage_t *) &jfs_ip->i_dtroot;
747	xp = (dtpage_t *) & dp->di_dtroot;
748	lv = ilinelock->lv;
749	for (n = 0; n < ilinelock->index; n++, lv++) {
750	memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
751	lv->length << L2DTSLOTSIZE);
752	}
753	} else {
754	jfs_err("diWrite: UFO tlock");
755	}
756
757	inlineData:
758	/*
759	* copy inline symlink from in-memory inode to on-disk inode
760	*/
761	if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
762	lv = & dilinelock->lv[dilinelock->index];
763	lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
764	lv->length = 2;
765	memcpy(&dp->di_inline_all, jfs_ip->i_inline_all, IDATASIZE);
766	dilinelock->index++;
767	}
768	/*
769	* copy inline data from in-memory inode to on-disk inode:
770	* 128 byte slot granularity
771	*/
772	if (test_cflag(COMMIT_Inlineea, ip)) {
773	lv = & dilinelock->lv[dilinelock->index];
774	lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
775	lv->length = 1;
776	memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
777	dilinelock->index++;
778
779	clear_cflag(COMMIT_Inlineea, ip);
780	}
781
782	/*
783	* lock/copy inode base: 128 byte slot granularity
784	*/
785	lv = & dilinelock->lv[dilinelock->index];
786	lv->offset = dioffset >> L2INODESLOTSIZE;
787	copy_to_dinode(dp, ip);
788	if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
789	lv->length = 2;
790	memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
791	} else
792	lv->length = 1;
793	dilinelock->index++;
794
795	/* release the buffer holding the updated on-disk inode.
796	* the buffer will be later written by commit processing.
797	*/
798	write_metapage(mp);
799
800	return (rc);
801	}
802
803
804	/*
805	* NAME: diFree(ip)
806	*
807	* FUNCTION: free a specified inode from the inode working map
808	* for a fileset or aggregate.
809	*
810	* if the inode to be freed represents the first (only)
811	* free inode within the iag, the iag will be placed on
812	* the ag free inode list.
813	*
814	* freeing the inode will cause the inode extent to be
815	* freed if the inode is the only allocated inode within
816	* the extent. in this case all the disk resource backing
817	* up the inode extent will be freed. in addition, the iag
818	* will be placed on the ag extent free list if the extent
819	* is the first free extent in the iag. if freeing the
820	* extent also means that no free inodes will exist for
821	* the iag, the iag will also be removed from the ag free
822	* inode list.
823	*
824	* the iag describing the inode will be freed if the extent
825	* is to be freed and it is the only backed extent within
826	* the iag. in this case, the iag will be removed from the
827	* ag free extent list and ag free inode list and placed on
828	* the inode map's free iag list.
829	*
830	* a careful update approach is used to provide consistency
831	* in the face of updates to multiple buffers. under this
832	* approach, all required buffers are obtained before making
833	* any updates and are held until all updates are complete.
834	*
835	* PARAMETERS:
836	* ip - inode to be freed.
837	*
838	* RETURN VALUES:
839	* 0 - success
840	* -EIO - i/o error.
841	*/
842	int diFree(struct inode *ip)
843	{
844	int rc;
845	ino_t inum = ip->i_ino;
846	struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
847	struct metapage *mp, *amp, *bmp, *cmp, *dmp;
848	int iagno, ino, extno, bitno, sword, agno;
849	int back, fwd;
850	u32 bitmap, mask;
851	struct inode *ipimap = JFS_SBI(sb: ip->i_sb)->ipimap;
852	struct inomap *imap = JFS_IP(inode: ipimap)->i_imap;
853	pxd_t freepxd;
854	tid_t tid;
855	struct inode *iplist[3];
856	struct tlock *tlck;
857	struct pxd_lock *pxdlock;
858
859	/*
860	* This is just to suppress compiler warnings. The same logic that
861	* references these variables is used to initialize them.
862	*/
863	aiagp = biagp = ciagp = diagp = NULL;
864
865	/* get the iag number containing the inode.
866	*/
867	iagno = INOTOIAG(inum);
868
869	/* make sure that the iag is contained within
870	* the map.
871	*/
872	if (iagno >= imap->im_nextiag) {
873	print_hex_dump(KERN_ERR, prefix_str: "imap: ", prefix_type: DUMP_PREFIX_ADDRESS, rowsize: 16, groupsize: 4,
874	buf: imap, len: 32, ascii: 0);
875	jfs_error(ip->i_sb, "inum = %d, iagno = %d, nextiag = %d\n",
876	(uint) inum, iagno, imap->im_nextiag);
877	return -EIO;
878	}
879
880	/* get the allocation group for this ino.
881	*/
882	agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
883
884	/* Lock the AG specific inode map information
885	*/
886	AG_LOCK(imap, agno);
887
888	/* Obtain read lock in imap inode. Don't release it until we have
889	* read all of the IAG's that we are going to.
890	*/
891	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
892
893	/* read the iag.
894	*/
895	if ((rc = diIAGRead(imap, iagno, &mp))) {
896	IREAD_UNLOCK(ipimap);
897	AG_UNLOCK(imap, agno);
898	return (rc);
899	}
900	iagp = (struct iag *) mp->data;
901
902	/* get the inode number and extent number of the inode within
903	* the iag and the inode number within the extent.
904	*/
905	ino = inum & (INOSPERIAG - 1);
906	extno = ino >> L2INOSPEREXT;
907	bitno = ino & (INOSPEREXT - 1);
908	mask = HIGHORDER >> bitno;
909
910	if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
911	jfs_error(ip->i_sb, "wmap shows inode already free\n");
912	}
913
914	if (!addressPXD(pxd: &iagp->inoext[extno])) {
915	release_metapage(mp);
916	IREAD_UNLOCK(ipimap);
917	AG_UNLOCK(imap, agno);
918	jfs_error(ip->i_sb, "invalid inoext\n");
919	return -EIO;
920	}
921
922	/* compute the bitmap for the extent reflecting the freed inode.
923	*/
924	bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
925
926	if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
927	release_metapage(mp);
928	IREAD_UNLOCK(ipimap);
929	AG_UNLOCK(imap, agno);
930	jfs_error(ip->i_sb, "numfree > numinos\n");
931	return -EIO;
932	}
933	/*
934	* inode extent still has some inodes or below low water mark:
935	* keep the inode extent;
936	*/
937	if (bitmap ||
938	imap->im_agctl[agno].numfree < 96 ||
939	(imap->im_agctl[agno].numfree < 288 &&
940	(((imap->im_agctl[agno].numfree * 100) /
941	imap->im_agctl[agno].numinos) <= 25))) {
942	/* if the iag currently has no free inodes (i.e.,
943	* the inode being freed is the first free inode of iag),
944	* insert the iag at head of the inode free list for the ag.
945	*/
946	if (iagp->nfreeinos == 0) {
947	/* check if there are any iags on the ag inode
948	* free list. if so, read the first one so that
949	* we can link the current iag onto the list at
950	* the head.
951	*/
952	if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
953	/* read the iag that currently is the head
954	* of the list.
955	*/
956	if ((rc = diIAGRead(imap, fwd, &amp))) {
957	IREAD_UNLOCK(ipimap);
958	AG_UNLOCK(imap, agno);
959	release_metapage(mp);
960	return (rc);
961	}
962	aiagp = (struct iag *) amp->data;
963
964	/* make current head point back to the iag.
965	*/
966	aiagp->inofreeback = cpu_to_le32(iagno);
967
968	write_metapage(mp: amp);
969	}
970
971	/* iag points forward to current head and iag
972	* becomes the new head of the list.
973	*/
974	iagp->inofreefwd =
975	cpu_to_le32(imap->im_agctl[agno].inofree);
976	iagp->inofreeback = cpu_to_le32(-1);
977	imap->im_agctl[agno].inofree = iagno;
978	}
979	IREAD_UNLOCK(ipimap);
980
981	/* update the free inode summary map for the extent if
982	* freeing the inode means the extent will now have free
983	* inodes (i.e., the inode being freed is the first free
984	* inode of extent),
985	*/
986	if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
987	sword = extno >> L2EXTSPERSUM;
988	bitno = extno & (EXTSPERSUM - 1);
989	iagp->inosmap[sword] &=
990	cpu_to_le32(~(HIGHORDER >> bitno));
991	}
992
993	/* update the bitmap.
994	*/
995	iagp->wmap[extno] = cpu_to_le32(bitmap);
996
997	/* update the free inode counts at the iag, ag and
998	* map level.
999	*/
1000	le32_add_cpu(var: &iagp->nfreeinos, val: 1);
1001	imap->im_agctl[agno].numfree += 1;
1002	atomic_inc(v: &imap->im_numfree);
1003
1004	/* release the AG inode map lock
1005	*/
1006	AG_UNLOCK(imap, agno);
1007
1008	/* write the iag */
1009	write_metapage(mp);
1010
1011	return (0);
1012	}
1013
1014
1015	/*
1016	* inode extent has become free and above low water mark:
1017	* free the inode extent;
1018	*/
1019
1020	/*
1021	* prepare to update iag list(s) (careful update step 1)
1022	*/
1023	amp = bmp = cmp = dmp = NULL;
1024	fwd = back = -1;
1025
1026	/* check if the iag currently has no free extents. if so,
1027	* it will be placed on the head of the ag extent free list.
1028	*/
1029	if (iagp->nfreeexts == 0) {
1030	/* check if the ag extent free list has any iags.
1031	* if so, read the iag at the head of the list now.
1032	* this (head) iag will be updated later to reflect
1033	* the addition of the current iag at the head of
1034	* the list.
1035	*/
1036	if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
1037	if ((rc = diIAGRead(imap, fwd, &amp)))
1038	goto error_out;
1039	aiagp = (struct iag *) amp->data;
1040	}
1041	} else {
1042	/* iag has free extents. check if the addition of a free
1043	* extent will cause all extents to be free within this
1044	* iag. if so, the iag will be removed from the ag extent
1045	* free list and placed on the inode map's free iag list.
1046	*/
1047	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1048	/* in preparation for removing the iag from the
1049	* ag extent free list, read the iags preceding
1050	* and following the iag on the ag extent free
1051	* list.
1052	*/
1053	if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
1054	if ((rc = diIAGRead(imap, fwd, &amp)))
1055	goto error_out;
1056	aiagp = (struct iag *) amp->data;
1057	}
1058
1059	if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
1060	if ((rc = diIAGRead(imap, back, &bmp)))
1061	goto error_out;
1062	biagp = (struct iag *) bmp->data;
1063	}
1064	}
1065	}
1066
1067	/* remove the iag from the ag inode free list if freeing
1068	* this extent cause the iag to have no free inodes.
1069	*/
1070	if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1071	int inofreeback = le32_to_cpu(iagp->inofreeback);
1072	int inofreefwd = le32_to_cpu(iagp->inofreefwd);
1073
1074	/* in preparation for removing the iag from the
1075	* ag inode free list, read the iags preceding
1076	* and following the iag on the ag inode free
1077	* list. before reading these iags, we must make
1078	* sure that we already don't have them in hand
1079	* from up above, since re-reading an iag (buffer)
1080	* we are currently holding would cause a deadlock.
1081	*/
1082	if (inofreefwd >= 0) {
1083
1084	if (inofreefwd == fwd)
1085	ciagp = (struct iag *) amp->data;
1086	else if (inofreefwd == back)
1087	ciagp = (struct iag *) bmp->data;
1088	else {
1089	if ((rc =
1090	diIAGRead(imap, inofreefwd, &cmp)))
1091	goto error_out;
1092	ciagp = (struct iag *) cmp->data;
1093	}
1094	assert(ciagp != NULL);
1095	}
1096
1097	if (inofreeback >= 0) {
1098	if (inofreeback == fwd)
1099	diagp = (struct iag *) amp->data;
1100	else if (inofreeback == back)
1101	diagp = (struct iag *) bmp->data;
1102	else {
1103	if ((rc =
1104	diIAGRead(imap, inofreeback, &dmp)))
1105	goto error_out;
1106	diagp = (struct iag *) dmp->data;
1107	}
1108	assert(diagp != NULL);
1109	}
1110	}
1111
1112	IREAD_UNLOCK(ipimap);
1113
1114	/*
1115	* invalidate any page of the inode extent freed from buffer cache;
1116	*/
1117	freepxd = iagp->inoext[extno];
1118	invalidate_pxd_metapages(ip, freepxd);
1119
1120	/*
1121	* update iag list(s) (careful update step 2)
1122	*/
1123	/* add the iag to the ag extent free list if this is the
1124	* first free extent for the iag.
1125	*/
1126	if (iagp->nfreeexts == 0) {
1127	if (fwd >= 0)
1128	aiagp->extfreeback = cpu_to_le32(iagno);
1129
1130	iagp->extfreefwd =
1131	cpu_to_le32(imap->im_agctl[agno].extfree);
1132	iagp->extfreeback = cpu_to_le32(-1);
1133	imap->im_agctl[agno].extfree = iagno;
1134	} else {
1135	/* remove the iag from the ag extent list if all extents
1136	* are now free and place it on the inode map iag free list.
1137	*/
1138	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1139	if (fwd >= 0)
1140	aiagp->extfreeback = iagp->extfreeback;
1141
1142	if (back >= 0)
1143	biagp->extfreefwd = iagp->extfreefwd;
1144	else
1145	imap->im_agctl[agno].extfree =
1146	le32_to_cpu(iagp->extfreefwd);
1147
1148	iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
1149
1150	IAGFREE_LOCK(imap);
1151	iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1152	imap->im_freeiag = iagno;
1153	IAGFREE_UNLOCK(imap);
1154	}
1155	}
1156
1157	/* remove the iag from the ag inode free list if freeing
1158	* this extent causes the iag to have no free inodes.
1159	*/
1160	if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1161	if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
1162	ciagp->inofreeback = iagp->inofreeback;
1163
1164	if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
1165	diagp->inofreefwd = iagp->inofreefwd;
1166	else
1167	imap->im_agctl[agno].inofree =
1168	le32_to_cpu(iagp->inofreefwd);
1169
1170	iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
1171	}
1172
1173	/* update the inode extent address and working map
1174	* to reflect the free extent.
1175	* the permanent map should have been updated already
1176	* for the inode being freed.
1177	*/
1178	if (iagp->pmap[extno] != 0) {
1179	jfs_error(ip->i_sb, "the pmap does not show inode free\n");
1180	}
1181	iagp->wmap[extno] = 0;
1182	PXDlength(pxd: &iagp->inoext[extno], len: 0);
1183	PXDaddress(pxd: &iagp->inoext[extno], addr: 0);
1184
1185	/* update the free extent and free inode summary maps
1186	* to reflect the freed extent.
1187	* the inode summary map is marked to indicate no inodes
1188	* available for the freed extent.
1189	*/
1190	sword = extno >> L2EXTSPERSUM;
1191	bitno = extno & (EXTSPERSUM - 1);
1192	mask = HIGHORDER >> bitno;
1193	iagp->inosmap[sword] |= cpu_to_le32(mask);
1194	iagp->extsmap[sword] &= cpu_to_le32(~mask);
1195
1196	/* update the number of free inodes and number of free extents
1197	* for the iag.
1198	*/
1199	le32_add_cpu(var: &iagp->nfreeinos, val: -(INOSPEREXT - 1));
1200	le32_add_cpu(var: &iagp->nfreeexts, val: 1);
1201
1202	/* update the number of free inodes and backed inodes
1203	* at the ag and inode map level.
1204	*/
1205	imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
1206	imap->im_agctl[agno].numinos -= INOSPEREXT;
1207	atomic_sub(INOSPEREXT - 1, v: &imap->im_numfree);
1208	atomic_sub(INOSPEREXT, v: &imap->im_numinos);
1209
1210	if (amp)
1211	write_metapage(mp: amp);
1212	if (bmp)
1213	write_metapage(mp: bmp);
1214	if (cmp)
1215	write_metapage(mp: cmp);
1216	if (dmp)
1217	write_metapage(mp: dmp);
1218
1219	/*
1220	* start transaction to update block allocation map
1221	* for the inode extent freed;
1222	*
1223	* N.B. AG_LOCK is released and iag will be released below, and
1224	* other thread may allocate inode from/reusing the ixad freed
1225	* BUT with new/different backing inode extent from the extent
1226	* to be freed by the transaction;
1227	*/
1228	tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
1229	mutex_lock(&JFS_IP(ipimap)->commit_mutex);
1230
1231	/* acquire tlock of the iag page of the freed ixad
1232	* to force the page NOHOMEOK (even though no data is
1233	* logged from the iag page) until NOREDOPAGE|FREEXTENT log
1234	* for the free of the extent is committed;
1235	* write FREEXTENT|NOREDOPAGE log record
1236	* N.B. linelock is overlaid as freed extent descriptor;
1237	*/
1238	tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
1239	pxdlock = (struct pxd_lock *) & tlck->lock;
1240	pxdlock->flag = mlckFREEPXD;
1241	pxdlock->pxd = freepxd;
1242	pxdlock->index = 1;
1243
1244	write_metapage(mp);
1245
1246	iplist[0] = ipimap;
1247
1248	/*
1249	* logredo needs the IAG number and IAG extent index in order
1250	* to ensure that the IMap is consistent. The least disruptive
1251	* way to pass these values through to the transaction manager
1252	* is in the iplist array.
1253	*
1254	* It's not pretty, but it works.
1255	*/
1256	iplist[1] = (struct inode *) (size_t)iagno;
1257	iplist[2] = (struct inode *) (size_t)extno;
1258
1259	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
1260
1261	txEnd(tid);
1262	mutex_unlock(lock: &JFS_IP(inode: ipimap)->commit_mutex);
1263
1264	/* unlock the AG inode map information */
1265	AG_UNLOCK(imap, agno);
1266
1267	return (0);
1268
1269	error_out:
1270	IREAD_UNLOCK(ipimap);
1271
1272	if (amp)
1273	release_metapage(amp);
1274	if (bmp)
1275	release_metapage(bmp);
1276	if (cmp)
1277	release_metapage(cmp);
1278	if (dmp)
1279	release_metapage(dmp);
1280
1281	AG_UNLOCK(imap, agno);
1282
1283	release_metapage(mp);
1284
1285	return (rc);
1286	}
1287
1288	/*
1289	* There are several places in the diAlloc* routines where we initialize
1290	* the inode.
1291	*/
1292	static inline void
1293	diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
1294	{
1295	struct jfs_inode_info *jfs_ip = JFS_IP(inode: ip);
1296
1297	ip->i_ino = (iagno << L2INOSPERIAG) + ino;
1298	jfs_ip->ixpxd = iagp->inoext[extno];
1299	jfs_ip->agstart = le64_to_cpu(iagp->agstart);
1300	jfs_ip->active_ag = -1;
1301	}
1302
1303
1304	/*
1305	* NAME: diAlloc(pip,dir,ip)
1306	*
1307	* FUNCTION: allocate a disk inode from the inode working map
1308	* for a fileset or aggregate.
1309	*
1310	* PARAMETERS:
1311	* pip - pointer to incore inode for the parent inode.
1312	* dir - 'true' if the new disk inode is for a directory.
1313	* ip - pointer to a new inode
1314	*
1315	* RETURN VALUES:
1316	* 0 - success.
1317	* -ENOSPC - insufficient disk resources.
1318	* -EIO - i/o error.
1319	*/
1320	int diAlloc(struct inode *pip, bool dir, struct inode *ip)
1321	{
1322	int rc, ino, iagno, addext, extno, bitno, sword;
1323	int nwords, rem, i, agno, dn_numag;
1324	u32 mask, inosmap, extsmap;
1325	struct inode *ipimap;
1326	struct metapage *mp;
1327	ino_t inum;
1328	struct iag *iagp;
1329	struct inomap *imap;
1330
1331	/* get the pointers to the inode map inode and the
1332	* corresponding imap control structure.
1333	*/
1334	ipimap = JFS_SBI(sb: pip->i_sb)->ipimap;
1335	imap = JFS_IP(inode: ipimap)->i_imap;
1336	JFS_IP(inode: ip)->ipimap = ipimap;
1337	JFS_IP(inode: ip)->fileset = FILESYSTEM_I;
1338
1339	/* for a directory, the allocation policy is to start
1340	* at the ag level using the preferred ag.
1341	*/
1342	if (dir) {
1343	agno = dbNextAG(ipbmap: JFS_SBI(sb: pip->i_sb)->ipbmap);
1344	AG_LOCK(imap, agno);
1345	goto tryag;
1346	}
1347
1348	/* for files, the policy starts off by trying to allocate from
1349	* the same iag containing the parent disk inode:
1350	* try to allocate the new disk inode close to the parent disk
1351	* inode, using parent disk inode number + 1 as the allocation
1352	* hint. (we use a left-to-right policy to attempt to avoid
1353	* moving backward on the disk.) compute the hint within the
1354	* file system and the iag.
1355	*/
1356
1357	/* get the ag number of this iag */
1358	agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
1359	dn_numag = JFS_SBI(sb: pip->i_sb)->bmap->db_numag;
1360	if (agno < 0 || agno > dn_numag)
1361	return -EIO;
1362
1363	if (atomic_read(v: &JFS_SBI(sb: pip->i_sb)->bmap->db_active[agno])) {
1364	/*
1365	* There is an open file actively growing. We want to
1366	* allocate new inodes from a different ag to avoid
1367	* fragmentation problems.
1368	*/
1369	agno = dbNextAG(ipbmap: JFS_SBI(sb: pip->i_sb)->ipbmap);
1370	AG_LOCK(imap, agno);
1371	goto tryag;
1372	}
1373
1374	inum = pip->i_ino + 1;
1375	ino = inum & (INOSPERIAG - 1);
1376
1377	/* back off the hint if it is outside of the iag */
1378	if (ino == 0)
1379	inum = pip->i_ino;
1380
1381	/* lock the AG inode map information */
1382	AG_LOCK(imap, agno);
1383
1384	/* Get read lock on imap inode */
1385	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
1386
1387	/* get the iag number and read the iag */
1388	iagno = INOTOIAG(inum);
1389	if ((rc = diIAGRead(imap, iagno, &mp))) {
1390	IREAD_UNLOCK(ipimap);
1391	AG_UNLOCK(imap, agno);
1392	return (rc);
1393	}
1394	iagp = (struct iag *) mp->data;
1395
1396	/* determine if new inode extent is allowed to be added to the iag.
1397	* new inode extent can be added to the iag if the ag
1398	* has less than 32 free disk inodes and the iag has free extents.
1399	*/
1400	addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
1401
1402	/*
1403	* try to allocate from the IAG
1404	*/
1405	/* check if the inode may be allocated from the iag
1406	* (i.e. the inode has free inodes or new extent can be added).
1407	*/
1408	if (iagp->nfreeinos || addext) {
1409	/* determine the extent number of the hint.
1410	*/
1411	extno = ino >> L2INOSPEREXT;
1412
1413	/* check if the extent containing the hint has backed
1414	* inodes. if so, try to allocate within this extent.
1415	*/
1416	if (addressPXD(pxd: &iagp->inoext[extno])) {
1417	bitno = ino & (INOSPEREXT - 1);
1418	if ((bitno =
1419	diFindFree(le32_to_cpu(iagp->wmap[extno]),
1420	bitno))
1421	< INOSPEREXT) {
1422	ino = (extno << L2INOSPEREXT) + bitno;
1423
1424	/* a free inode (bit) was found within this
1425	* extent, so allocate it.
1426	*/
1427	rc = diAllocBit(imap, iagp, ino);
1428	IREAD_UNLOCK(ipimap);
1429	if (rc) {
1430	assert(rc == -EIO);
1431	} else {
1432	/* set the results of the allocation
1433	* and write the iag.
1434	*/
1435	diInitInode(ip, iagno, ino, extno,
1436	iagp);
1437	mark_metapage_dirty(mp);
1438	}
1439	release_metapage(mp);
1440
1441	/* free the AG lock and return.
1442	*/
1443	AG_UNLOCK(imap, agno);
1444	return (rc);
1445	}
1446
1447	if (!addext)
1448	extno =
1449	(extno ==
1450	EXTSPERIAG - 1) ? 0 : extno + 1;
1451	}
1452
1453	/*
1454	* no free inodes within the extent containing the hint.
1455	*
1456	* try to allocate from the backed extents following
1457	* hint or, if appropriate (i.e. addext is true), allocate
1458	* an extent of free inodes at or following the extent
1459	* containing the hint.
1460	*
1461	* the free inode and free extent summary maps are used
1462	* here, so determine the starting summary map position
1463	* and the number of words we'll have to examine. again,
1464	* the approach is to allocate following the hint, so we
1465	* might have to initially ignore prior bits of the summary
1466	* map that represent extents prior to the extent containing
1467	* the hint and later revisit these bits.
1468	*/
1469	bitno = extno & (EXTSPERSUM - 1);
1470	nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
1471	sword = extno >> L2EXTSPERSUM;
1472
1473	/* mask any prior bits for the starting words of the
1474	* summary map.
1475	*/
1476	mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno));
1477	inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
1478	extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
1479
1480	/* scan the free inode and free extent summary maps for
1481	* free resources.
1482	*/
1483	for (i = 0; i < nwords; i++) {
1484	/* check if this word of the free inode summary
1485	* map describes an extent with free inodes.
1486	*/
1487	if (~inosmap) {
1488	/* an extent with free inodes has been
1489	* found. determine the extent number
1490	* and the inode number within the extent.
1491	*/
1492	rem = diFindFree(inosmap, 0);
1493	extno = (sword << L2EXTSPERSUM) + rem;
1494	rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
1495	0);
1496	if (rem >= INOSPEREXT) {
1497	IREAD_UNLOCK(ipimap);
1498	release_metapage(mp);
1499	AG_UNLOCK(imap, agno);
1500	jfs_error(ip->i_sb,
1501	"can't find free bit in wmap\n");
1502	return -EIO;
1503	}
1504
1505	/* determine the inode number within the
1506	* iag and allocate the inode from the
1507	* map.
1508	*/
1509	ino = (extno << L2INOSPEREXT) + rem;
1510	rc = diAllocBit(imap, iagp, ino);
1511	IREAD_UNLOCK(ipimap);
1512	if (rc)
1513	assert(rc == -EIO);
1514	else {
1515	/* set the results of the allocation
1516	* and write the iag.
1517	*/
1518	diInitInode(ip, iagno, ino, extno,
1519	iagp);
1520	mark_metapage_dirty(mp);
1521	}
1522	release_metapage(mp);
1523
1524	/* free the AG lock and return.
1525	*/
1526	AG_UNLOCK(imap, agno);
1527	return (rc);
1528
1529	}
1530
1531	/* check if we may allocate an extent of free
1532	* inodes and whether this word of the free
1533	* extents summary map describes a free extent.
1534	*/
1535	if (addext && ~extsmap) {
1536	/* a free extent has been found. determine
1537	* the extent number.
1538	*/
1539	rem = diFindFree(extsmap, 0);
1540	extno = (sword << L2EXTSPERSUM) + rem;
1541
1542	/* allocate an extent of free inodes.
1543	*/
1544	if ((rc = diNewExt(imap, iagp, extno))) {
1545	/* if there is no disk space for a
1546	* new extent, try to allocate the
1547	* disk inode from somewhere else.
1548	*/
1549	if (rc == -ENOSPC)
1550	break;
1551
1552	assert(rc == -EIO);
1553	} else {
1554	/* set the results of the allocation
1555	* and write the iag.
1556	*/
1557	diInitInode(ip, iagno,
1558	ino: extno << L2INOSPEREXT,
1559	extno, iagp);
1560	mark_metapage_dirty(mp);
1561	}
1562	release_metapage(mp);
1563	/* free the imap inode & the AG lock & return.
1564	*/
1565	IREAD_UNLOCK(ipimap);
1566	AG_UNLOCK(imap, agno);
1567	return (rc);
1568	}
1569
1570	/* move on to the next set of summary map words.
1571	*/
1572	sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
1573	inosmap = le32_to_cpu(iagp->inosmap[sword]);
1574	extsmap = le32_to_cpu(iagp->extsmap[sword]);
1575	}
1576	}
1577	/* unlock imap inode */
1578	IREAD_UNLOCK(ipimap);
1579
1580	/* nothing doing in this iag, so release it. */
1581	release_metapage(mp);
1582
1583	tryag:
1584	/*
1585	* try to allocate anywhere within the same AG as the parent inode.
1586	*/
1587	rc = diAllocAG(imap, agno, dir, ip);
1588
1589	AG_UNLOCK(imap, agno);
1590
1591	if (rc != -ENOSPC)
1592	return (rc);
1593
1594	/*
1595	* try to allocate in any AG.
1596	*/
1597	return (diAllocAny(imap, agno, dir, ip));
1598	}
1599
1600
1601	/*
1602	* NAME: diAllocAG(imap,agno,dir,ip)
1603	*
1604	* FUNCTION: allocate a disk inode from the allocation group.
1605	*
1606	* this routine first determines if a new extent of free
1607	* inodes should be added for the allocation group, with
1608	* the current request satisfied from this extent. if this
1609	* is the case, an attempt will be made to do just that. if
1610	* this attempt fails or it has been determined that a new
1611	* extent should not be added, an attempt is made to satisfy
1612	* the request by allocating an existing (backed) free inode
1613	* from the allocation group.
1614	*
1615	* PRE CONDITION: Already have the AG lock for this AG.
1616	*
1617	* PARAMETERS:
1618	* imap - pointer to inode map control structure.
1619	* agno - allocation group to allocate from.
1620	* dir - 'true' if the new disk inode is for a directory.
1621	* ip - pointer to the new inode to be filled in on successful return
1622	* with the disk inode number allocated, its extent address
1623	* and the start of the ag.
1624	*
1625	* RETURN VALUES:
1626	* 0 - success.
1627	* -ENOSPC - insufficient disk resources.
1628	* -EIO - i/o error.
1629	*/
1630	static int
1631	diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
1632	{
1633	int rc, addext, numfree, numinos;
1634
1635	/* get the number of free and the number of backed disk
1636	* inodes currently within the ag.
1637	*/
1638	numfree = imap->im_agctl[agno].numfree;
1639	numinos = imap->im_agctl[agno].numinos;
1640
1641	if (numfree > numinos) {
1642	jfs_error(ip->i_sb, "numfree > numinos\n");
1643	return -EIO;
1644	}
1645
1646	/* determine if we should allocate a new extent of free inodes
1647	* within the ag: for directory inodes, add a new extent
1648	* if there are a small number of free inodes or number of free
1649	* inodes is a small percentage of the number of backed inodes.
1650	*/
1651	if (dir)
1652	addext = (numfree < 64 ||
1653	(numfree < 256
1654	&& ((numfree * 100) / numinos) <= 20));
1655	else
1656	addext = (numfree == 0);
1657
1658	/*
1659	* try to allocate a new extent of free inodes.
1660	*/
1661	if (addext) {
1662	/* if free space is not available for this new extent, try
1663	* below to allocate a free and existing (already backed)
1664	* inode from the ag.
1665	*/
1666	if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
1667	return (rc);
1668	}
1669
1670	/*
1671	* try to allocate an existing free inode from the ag.
1672	*/
1673	return (diAllocIno(imap, agno, ip));
1674	}
1675
1676
1677	/*
1678	* NAME: diAllocAny(imap,agno,dir,iap)
1679	*
1680	* FUNCTION: allocate a disk inode from any other allocation group.
1681	*
1682	* this routine is called when an allocation attempt within
1683	* the primary allocation group has failed. if attempts to
1684	* allocate an inode from any allocation group other than the
1685	* specified primary group.
1686	*
1687	* PARAMETERS:
1688	* imap - pointer to inode map control structure.
1689	* agno - primary allocation group (to avoid).
1690	* dir - 'true' if the new disk inode is for a directory.
1691	* ip - pointer to a new inode to be filled in on successful return
1692	* with the disk inode number allocated, its extent address
1693	* and the start of the ag.
1694	*
1695	* RETURN VALUES:
1696	* 0 - success.
1697	* -ENOSPC - insufficient disk resources.
1698	* -EIO - i/o error.
1699	*/
1700	static int
1701	diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
1702	{
1703	int ag, rc;
1704	int maxag = JFS_SBI(sb: imap->im_ipimap->i_sb)->bmap->db_maxag;
1705
1706
1707	/* try to allocate from the ags following agno up to
1708	* the maximum ag number.
1709	*/
1710	for (ag = agno + 1; ag <= maxag; ag++) {
1711	AG_LOCK(imap, ag);
1712
1713	rc = diAllocAG(imap, agno: ag, dir, ip);
1714
1715	AG_UNLOCK(imap, ag);
1716
1717	if (rc != -ENOSPC)
1718	return (rc);
1719	}
1720
1721	/* try to allocate from the ags in front of agno.
1722	*/
1723	for (ag = 0; ag < agno; ag++) {
1724	AG_LOCK(imap, ag);
1725
1726	rc = diAllocAG(imap, agno: ag, dir, ip);
1727
1728	AG_UNLOCK(imap, ag);
1729
1730	if (rc != -ENOSPC)
1731	return (rc);
1732	}
1733
1734	/* no free disk inodes.
1735	*/
1736	return -ENOSPC;
1737	}
1738
1739
1740	/*
1741	* NAME: diAllocIno(imap,agno,ip)
1742	*
1743	* FUNCTION: allocate a disk inode from the allocation group's free
1744	* inode list, returning an error if this free list is
1745	* empty (i.e. no iags on the list).
1746	*
1747	* allocation occurs from the first iag on the list using
1748	* the iag's free inode summary map to find the leftmost
1749	* free inode in the iag.
1750	*
1751	* PRE CONDITION: Already have AG lock for this AG.
1752	*
1753	* PARAMETERS:
1754	* imap - pointer to inode map control structure.
1755	* agno - allocation group.
1756	* ip - pointer to new inode to be filled in on successful return
1757	* with the disk inode number allocated, its extent address
1758	* and the start of the ag.
1759	*
1760	* RETURN VALUES:
1761	* 0 - success.
1762	* -ENOSPC - insufficient disk resources.
1763	* -EIO - i/o error.
1764	*/
1765	static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
1766	{
1767	int iagno, ino, rc, rem, extno, sword;
1768	struct metapage *mp;
1769	struct iag *iagp;
1770
1771	/* check if there are iags on the ag's free inode list.
1772	*/
1773	if ((iagno = imap->im_agctl[agno].inofree) < 0)
1774	return -ENOSPC;
1775
1776	/* obtain read lock on imap inode */
1777	IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1778
1779	/* read the iag at the head of the list.
1780	*/
1781	if ((rc = diIAGRead(imap, iagno, &mp))) {
1782	IREAD_UNLOCK(imap->im_ipimap);
1783	return (rc);
1784	}
1785	iagp = (struct iag *) mp->data;
1786
1787	/* better be free inodes in this iag if it is on the
1788	* list.
1789	*/
1790	if (!iagp->nfreeinos) {
1791	IREAD_UNLOCK(imap->im_ipimap);
1792	release_metapage(mp);
1793	jfs_error(ip->i_sb, "nfreeinos = 0, but iag on freelist\n");
1794	return -EIO;
1795	}
1796
1797	/* scan the free inode summary map to find an extent
1798	* with free inodes.
1799	*/
1800	for (sword = 0;; sword++) {
1801	if (sword >= SMAPSZ) {
1802	IREAD_UNLOCK(imap->im_ipimap);
1803	release_metapage(mp);
1804	jfs_error(ip->i_sb,
1805	"free inode not found in summary map\n");
1806	return -EIO;
1807	}
1808
1809	if (~iagp->inosmap[sword])
1810	break;
1811	}
1812
1813	/* found a extent with free inodes. determine
1814	* the extent number.
1815	*/
1816	rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
1817	if (rem >= EXTSPERSUM) {
1818	IREAD_UNLOCK(imap->im_ipimap);
1819	release_metapage(mp);
1820	jfs_error(ip->i_sb, "no free extent found\n");
1821	return -EIO;
1822	}
1823	extno = (sword << L2EXTSPERSUM) + rem;
1824
1825	/* find the first free inode in the extent.
1826	*/
1827	rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
1828	if (rem >= INOSPEREXT) {
1829	IREAD_UNLOCK(imap->im_ipimap);
1830	release_metapage(mp);
1831	jfs_error(ip->i_sb, "free inode not found\n");
1832	return -EIO;
1833	}
1834
1835	/* compute the inode number within the iag.
1836	*/
1837	ino = (extno << L2INOSPEREXT) + rem;
1838
1839	/* allocate the inode.
1840	*/
1841	rc = diAllocBit(imap, iagp, ino);
1842	IREAD_UNLOCK(imap->im_ipimap);
1843	if (rc) {
1844	release_metapage(mp);
1845	return (rc);
1846	}
1847
1848	/* set the results of the allocation and write the iag.
1849	*/
1850	diInitInode(ip, iagno, ino, extno, iagp);
1851	write_metapage(mp);
1852
1853	return (0);
1854	}
1855
1856
1857	/*
1858	* NAME: diAllocExt(imap,agno,ip)
1859	*
1860	* FUNCTION: add a new extent of free inodes to an iag, allocating
1861	* an inode from this extent to satisfy the current allocation
1862	* request.
1863	*
1864	* this routine first tries to find an existing iag with free
1865	* extents through the ag free extent list. if list is not
1866	* empty, the head of the list will be selected as the home
1867	* of the new extent of free inodes. otherwise (the list is
1868	* empty), a new iag will be allocated for the ag to contain
1869	* the extent.
1870	*
1871	* once an iag has been selected, the free extent summary map
1872	* is used to locate a free extent within the iag and diNewExt()
1873	* is called to initialize the extent, with initialization
1874	* including the allocation of the first inode of the extent
1875	* for the purpose of satisfying this request.
1876	*
1877	* PARAMETERS:
1878	* imap - pointer to inode map control structure.
1879	* agno - allocation group number.
1880	* ip - pointer to new inode to be filled in on successful return
1881	* with the disk inode number allocated, its extent address
1882	* and the start of the ag.
1883	*
1884	* RETURN VALUES:
1885	* 0 - success.
1886	* -ENOSPC - insufficient disk resources.
1887	* -EIO - i/o error.
1888	*/
1889	static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
1890	{
1891	int rem, iagno, sword, extno, rc;
1892	struct metapage *mp;
1893	struct iag *iagp;
1894
1895	/* check if the ag has any iags with free extents. if not,
1896	* allocate a new iag for the ag.
1897	*/
1898	if ((iagno = imap->im_agctl[agno].extfree) < 0) {
1899	/* If successful, diNewIAG will obtain the read lock on the
1900	* imap inode.
1901	*/
1902	if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
1903	return (rc);
1904	}
1905	iagp = (struct iag *) mp->data;
1906
1907	/* set the ag number if this a brand new iag
1908	*/
1909	iagp->agstart =
1910	cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
1911	} else {
1912	/* read the iag.
1913	*/
1914	IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1915	if ((rc = diIAGRead(imap, iagno, &mp))) {
1916	IREAD_UNLOCK(imap->im_ipimap);
1917	jfs_error(ip->i_sb, "error reading iag\n");
1918	return rc;
1919	}
1920	iagp = (struct iag *) mp->data;
1921	}
1922
1923	/* using the free extent summary map, find a free extent.
1924	*/
1925	for (sword = 0;; sword++) {
1926	if (sword >= SMAPSZ) {
1927	release_metapage(mp);
1928	IREAD_UNLOCK(imap->im_ipimap);
1929	jfs_error(ip->i_sb, "free ext summary map not found\n");
1930	return -EIO;
1931	}
1932	if (~iagp->extsmap[sword])
1933	break;
1934	}
1935
1936	/* determine the extent number of the free extent.
1937	*/
1938	rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
1939	if (rem >= EXTSPERSUM) {
1940	release_metapage(mp);
1941	IREAD_UNLOCK(imap->im_ipimap);
1942	jfs_error(ip->i_sb, "free extent not found\n");
1943	return -EIO;
1944	}
1945	extno = (sword << L2EXTSPERSUM) + rem;
1946
1947	/* initialize the new extent.
1948	*/
1949	rc = diNewExt(imap, iagp, extno);
1950	IREAD_UNLOCK(imap->im_ipimap);
1951	if (rc) {
1952	/* something bad happened. if a new iag was allocated,
1953	* place it back on the inode map's iag free list, and
1954	* clear the ag number information.
1955	*/
1956	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
1957	IAGFREE_LOCK(imap);
1958	iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1959	imap->im_freeiag = iagno;
1960	IAGFREE_UNLOCK(imap);
1961	}
1962	write_metapage(mp);
1963	return (rc);
1964	}
1965
1966	/* set the results of the allocation and write the iag.
1967	*/
1968	diInitInode(ip, iagno, ino: extno << L2INOSPEREXT, extno, iagp);
1969
1970	write_metapage(mp);
1971
1972	return (0);
1973	}
1974
1975
1976	/*
1977	* NAME: diAllocBit(imap,iagp,ino)
1978	*
1979	* FUNCTION: allocate a backed inode from an iag.
1980	*
1981	* this routine performs the mechanics of allocating a
1982	* specified inode from a backed extent.
1983	*
1984	* if the inode to be allocated represents the last free
1985	* inode within the iag, the iag will be removed from the
1986	* ag free inode list.
1987	*
1988	* a careful update approach is used to provide consistency
1989	* in the face of updates to multiple buffers. under this
1990	* approach, all required buffers are obtained before making
1991	* any updates and are held all are updates are complete.
1992	*
1993	* PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
1994	* this AG. Must have read lock on imap inode.
1995	*
1996	* PARAMETERS:
1997	* imap - pointer to inode map control structure.
1998	* iagp - pointer to iag.
1999	* ino - inode number to be allocated within the iag.
2000	*
2001	* RETURN VALUES:
2002	* 0 - success.
2003	* -ENOSPC - insufficient disk resources.
2004	* -EIO - i/o error.
2005	*/
2006	static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
2007	{
2008	int extno, bitno, agno, sword, rc;
2009	struct metapage *amp = NULL, *bmp = NULL;
2010	struct iag *aiagp = NULL, *biagp = NULL;
2011	u32 mask;
2012
2013	/* check if this is the last free inode within the iag.
2014	* if so, it will have to be removed from the ag free
2015	* inode list, so get the iags preceding and following
2016	* it on the list.
2017	*/
2018	if (iagp->nfreeinos == cpu_to_le32(1)) {
2019	if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
2020	if ((rc =
2021	diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
2022	&amp)))
2023	return (rc);
2024	aiagp = (struct iag *) amp->data;
2025	}
2026
2027	if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
2028	if ((rc =
2029	diIAGRead(imap,
2030	le32_to_cpu(iagp->inofreeback),
2031	&bmp))) {
2032	if (amp)
2033	release_metapage(amp);
2034	return (rc);
2035	}
2036	biagp = (struct iag *) bmp->data;
2037	}
2038	}
2039
2040	/* get the ag number, extent number, inode number within
2041	* the extent.
2042	*/
2043	agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
2044	extno = ino >> L2INOSPEREXT;
2045	bitno = ino & (INOSPEREXT - 1);
2046
2047	/* compute the mask for setting the map.
2048	*/
2049	mask = HIGHORDER >> bitno;
2050
2051	/* the inode should be free and backed.
2052	*/
2053	if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
2054	((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
2055	(addressPXD(pxd: &iagp->inoext[extno]) == 0)) {
2056	if (amp)
2057	release_metapage(amp);
2058	if (bmp)
2059	release_metapage(bmp);
2060
2061	jfs_error(imap->im_ipimap->i_sb, "iag inconsistent\n");
2062	return -EIO;
2063	}
2064
2065	/* mark the inode as allocated in the working map.
2066	*/
2067	iagp->wmap[extno] |= cpu_to_le32(mask);
2068
2069	/* check if all inodes within the extent are now
2070	* allocated. if so, update the free inode summary
2071	* map to reflect this.
2072	*/
2073	if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
2074	sword = extno >> L2EXTSPERSUM;
2075	bitno = extno & (EXTSPERSUM - 1);
2076	iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
2077	}
2078
2079	/* if this was the last free inode in the iag, remove the
2080	* iag from the ag free inode list.
2081	*/
2082	if (iagp->nfreeinos == cpu_to_le32(1)) {
2083	if (amp) {
2084	aiagp->inofreeback = iagp->inofreeback;
2085	write_metapage(mp: amp);
2086	}
2087
2088	if (bmp) {
2089	biagp->inofreefwd = iagp->inofreefwd;
2090	write_metapage(mp: bmp);
2091	} else {
2092	imap->im_agctl[agno].inofree =
2093	le32_to_cpu(iagp->inofreefwd);
2094	}
2095	iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2096	}
2097
2098	/* update the free inode count at the iag, ag, inode
2099	* map levels.
2100	*/
2101	le32_add_cpu(var: &iagp->nfreeinos, val: -1);
2102	imap->im_agctl[agno].numfree -= 1;
2103	atomic_dec(v: &imap->im_numfree);
2104
2105	return (0);
2106	}
2107
2108
2109	/*
2110	* NAME: diNewExt(imap,iagp,extno)
2111	*
2112	* FUNCTION: initialize a new extent of inodes for an iag, allocating
2113	* the first inode of the extent for use for the current
2114	* allocation request.
2115	*
2116	* disk resources are allocated for the new extent of inodes
2117	* and the inodes themselves are initialized to reflect their
2118	* existence within the extent (i.e. their inode numbers and
2119	* inode extent addresses are set) and their initial state
2120	* (mode and link count are set to zero).
2121	*
2122	* if the iag is new, it is not yet on an ag extent free list
2123	* but will now be placed on this list.
2124	*
2125	* if the allocation of the new extent causes the iag to
2126	* have no free extent, the iag will be removed from the
2127	* ag extent free list.
2128	*
2129	* if the iag has no free backed inodes, it will be placed
2130	* on the ag free inode list, since the addition of the new
2131	* extent will now cause it to have free inodes.
2132	*
2133	* a careful update approach is used to provide consistency
2134	* (i.e. list consistency) in the face of updates to multiple
2135	* buffers. under this approach, all required buffers are
2136	* obtained before making any updates and are held until all
2137	* updates are complete.
2138	*
2139	* PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2140	* this AG. Must have read lock on imap inode.
2141	*
2142	* PARAMETERS:
2143	* imap - pointer to inode map control structure.
2144	* iagp - pointer to iag.
2145	* extno - extent number.
2146	*
2147	* RETURN VALUES:
2148	* 0 - success.
2149	* -ENOSPC - insufficient disk resources.
2150	* -EIO - i/o error.
2151	*/
2152	static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
2153	{
2154	int agno, iagno, fwd, back, freei = 0, sword, rc;
2155	struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
2156	struct metapage *amp, *bmp, *cmp, *dmp;
2157	struct inode *ipimap;
2158	s64 blkno, hint;
2159	int i, j;
2160	u32 mask;
2161	ino_t ino;
2162	struct dinode *dp;
2163	struct jfs_sb_info *sbi;
2164
2165	/* better have free extents.
2166	*/
2167	if (!iagp->nfreeexts) {
2168	jfs_error(imap->im_ipimap->i_sb, "no free extents\n");
2169	return -EIO;
2170	}
2171
2172	/* get the inode map inode.
2173	*/
2174	ipimap = imap->im_ipimap;
2175	sbi = JFS_SBI(sb: ipimap->i_sb);
2176
2177	amp = bmp = cmp = NULL;
2178
2179	/* get the ag and iag numbers for this iag.
2180	*/
2181	agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
2182	iagno = le32_to_cpu(iagp->iagnum);
2183
2184	/* check if this is the last free extent within the
2185	* iag. if so, the iag must be removed from the ag
2186	* free extent list, so get the iags preceding and
2187	* following the iag on this list.
2188	*/
2189	if (iagp->nfreeexts == cpu_to_le32(1)) {
2190	if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
2191	if ((rc = diIAGRead(imap, fwd, &amp)))
2192	return (rc);
2193	aiagp = (struct iag *) amp->data;
2194	}
2195
2196	if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
2197	if ((rc = diIAGRead(imap, back, &bmp)))
2198	goto error_out;
2199	biagp = (struct iag *) bmp->data;
2200	}
2201	} else {
2202	/* the iag has free extents. if all extents are free
2203	* (as is the case for a newly allocated iag), the iag
2204	* must be added to the ag free extent list, so get
2205	* the iag at the head of the list in preparation for
2206	* adding this iag to this list.
2207	*/
2208	fwd = back = -1;
2209	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2210	if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
2211	if ((rc = diIAGRead(imap, fwd, &amp)))
2212	goto error_out;
2213	aiagp = (struct iag *) amp->data;
2214	}
2215	}
2216	}
2217
2218	/* check if the iag has no free inodes. if so, the iag
2219	* will have to be added to the ag free inode list, so get
2220	* the iag at the head of the list in preparation for
2221	* adding this iag to this list. in doing this, we must
2222	* check if we already have the iag at the head of
2223	* the list in hand.
2224	*/
2225	if (iagp->nfreeinos == 0) {
2226	freei = imap->im_agctl[agno].inofree;
2227
2228	if (freei >= 0) {
2229	if (freei == fwd) {
2230	ciagp = aiagp;
2231	} else if (freei == back) {
2232	ciagp = biagp;
2233	} else {
2234	if ((rc = diIAGRead(imap, freei, &cmp)))
2235	goto error_out;
2236	ciagp = (struct iag *) cmp->data;
2237	}
2238	if (ciagp == NULL) {
2239	jfs_error(imap->im_ipimap->i_sb,
2240	"ciagp == NULL\n");
2241	rc = -EIO;
2242	goto error_out;
2243	}
2244	}
2245	}
2246
2247	/* allocate disk space for the inode extent.
2248	*/
2249	if ((extno == 0) || (addressPXD(pxd: &iagp->inoext[extno - 1]) == 0))
2250	hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
2251	else
2252	hint = addressPXD(pxd: &iagp->inoext[extno - 1]) +
2253	lengthPXD(pxd: &iagp->inoext[extno - 1]) - 1;
2254
2255	if ((rc = dbAlloc(ipbmap: ipimap, hint, nblocks: (s64) imap->im_nbperiext, results: &blkno)))
2256	goto error_out;
2257
2258	/* compute the inode number of the first inode within the
2259	* extent.
2260	*/
2261	ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
2262
2263	/* initialize the inodes within the newly allocated extent a
2264	* page at a time.
2265	*/
2266	for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
2267	/* get a buffer for this page of disk inodes.
2268	*/
2269	dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
2270	if (dmp == NULL) {
2271	rc = -EIO;
2272	goto error_out;
2273	}
2274	dp = (struct dinode *) dmp->data;
2275
2276	/* initialize the inode number, mode, link count and
2277	* inode extent address.
2278	*/
2279	for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
2280	dp->di_inostamp = cpu_to_le32(sbi->inostamp);
2281	dp->di_number = cpu_to_le32(ino);
2282	dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
2283	dp->di_mode = 0;
2284	dp->di_nlink = 0;
2285	PXDaddress(pxd: &(dp->di_ixpxd), addr: blkno);
2286	PXDlength(pxd: &(dp->di_ixpxd), len: imap->im_nbperiext);
2287	}
2288	write_metapage(mp: dmp);
2289	}
2290
2291	/* if this is the last free extent within the iag, remove the
2292	* iag from the ag free extent list.
2293	*/
2294	if (iagp->nfreeexts == cpu_to_le32(1)) {
2295	if (fwd >= 0)
2296	aiagp->extfreeback = iagp->extfreeback;
2297
2298	if (back >= 0)
2299	biagp->extfreefwd = iagp->extfreefwd;
2300	else
2301	imap->im_agctl[agno].extfree =
2302	le32_to_cpu(iagp->extfreefwd);
2303
2304	iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2305	} else {
2306	/* if the iag has all free extents (newly allocated iag),
2307	* add the iag to the ag free extent list.
2308	*/
2309	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2310	if (fwd >= 0)
2311	aiagp->extfreeback = cpu_to_le32(iagno);
2312
2313	iagp->extfreefwd = cpu_to_le32(fwd);
2314	iagp->extfreeback = cpu_to_le32(-1);
2315	imap->im_agctl[agno].extfree = iagno;
2316	}
2317	}
2318
2319	/* if the iag has no free inodes, add the iag to the
2320	* ag free inode list.
2321	*/
2322	if (iagp->nfreeinos == 0) {
2323	if (freei >= 0)
2324	ciagp->inofreeback = cpu_to_le32(iagno);
2325
2326	iagp->inofreefwd =
2327	cpu_to_le32(imap->im_agctl[agno].inofree);
2328	iagp->inofreeback = cpu_to_le32(-1);
2329	imap->im_agctl[agno].inofree = iagno;
2330	}
2331
2332	/* initialize the extent descriptor of the extent. */
2333	PXDlength(pxd: &iagp->inoext[extno], len: imap->im_nbperiext);
2334	PXDaddress(pxd: &iagp->inoext[extno], addr: blkno);
2335
2336	/* initialize the working and persistent map of the extent.
2337	* the working map will be initialized such that
2338	* it indicates the first inode of the extent is allocated.
2339	*/
2340	iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
2341	iagp->pmap[extno] = 0;
2342
2343	/* update the free inode and free extent summary maps
2344	* for the extent to indicate the extent has free inodes
2345	* and no longer represents a free extent.
2346	*/
2347	sword = extno >> L2EXTSPERSUM;
2348	mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
2349	iagp->extsmap[sword] |= cpu_to_le32(mask);
2350	iagp->inosmap[sword] &= cpu_to_le32(~mask);
2351
2352	/* update the free inode and free extent counts for the
2353	* iag.
2354	*/
2355	le32_add_cpu(var: &iagp->nfreeinos, val: (INOSPEREXT - 1));
2356	le32_add_cpu(var: &iagp->nfreeexts, val: -1);
2357
2358	/* update the free and backed inode counts for the ag.
2359	*/
2360	imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
2361	imap->im_agctl[agno].numinos += INOSPEREXT;
2362
2363	/* update the free and backed inode counts for the inode map.
2364	*/
2365	atomic_add(INOSPEREXT - 1, v: &imap->im_numfree);
2366	atomic_add(INOSPEREXT, v: &imap->im_numinos);
2367
2368	/* write the iags.
2369	*/
2370	if (amp)
2371	write_metapage(mp: amp);
2372	if (bmp)
2373	write_metapage(mp: bmp);
2374	if (cmp)
2375	write_metapage(mp: cmp);
2376
2377	return (0);
2378
2379	error_out:
2380
2381	/* release the iags.
2382	*/
2383	if (amp)
2384	release_metapage(amp);
2385	if (bmp)
2386	release_metapage(bmp);
2387	if (cmp)
2388	release_metapage(cmp);
2389
2390	return (rc);
2391	}
2392
2393
2394	/*
2395	* NAME: diNewIAG(imap,iagnop,agno)
2396	*
2397	* FUNCTION: allocate a new iag for an allocation group.
2398	*
2399	* first tries to allocate the iag from the inode map
2400	* iagfree list:
2401	* if the list has free iags, the head of the list is removed
2402	* and returned to satisfy the request.
2403	* if the inode map's iag free list is empty, the inode map
2404	* is extended to hold a new iag. this new iag is initialized
2405	* and returned to satisfy the request.
2406	*
2407	* PARAMETERS:
2408	* imap - pointer to inode map control structure.
2409	* iagnop - pointer to an iag number set with the number of the
2410	* newly allocated iag upon successful return.
2411	* agno - allocation group number.
2412	* bpp - Buffer pointer to be filled in with new IAG's buffer
2413	*
2414	* RETURN VALUES:
2415	* 0 - success.
2416	* -ENOSPC - insufficient disk resources.
2417	* -EIO - i/o error.
2418	*
2419	* serialization:
2420	* AG lock held on entry/exit;
2421	* write lock on the map is held inside;
2422	* read lock on the map is held on successful completion;
2423	*
2424	* note: new iag transaction:
2425	* . synchronously write iag;
2426	* . write log of xtree and inode of imap;
2427	* . commit;
2428	* . synchronous write of xtree (right to left, bottom to top);
2429	* . at start of logredo(): init in-memory imap with one additional iag page;
2430	* . at end of logredo(): re-read imap inode to determine
2431	* new imap size;
2432	*/
2433	static int
2434	diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
2435	{
2436	int rc;
2437	int iagno, i, xlen;
2438	struct inode *ipimap;
2439	struct super_block *sb;
2440	struct jfs_sb_info *sbi;
2441	struct metapage *mp;
2442	struct iag *iagp;
2443	s64 xaddr = 0;
2444	s64 blkno;
2445	tid_t tid;
2446	struct inode *iplist[1];
2447
2448	/* pick up pointers to the inode map and mount inodes */
2449	ipimap = imap->im_ipimap;
2450	sb = ipimap->i_sb;
2451	sbi = JFS_SBI(sb);
2452
2453	/* acquire the free iag lock */
2454	IAGFREE_LOCK(imap);
2455
2456	/* if there are any iags on the inode map free iag list,
2457	* allocate the iag from the head of the list.
2458	*/
2459	if (imap->im_freeiag >= 0) {
2460	/* pick up the iag number at the head of the list */
2461	iagno = imap->im_freeiag;
2462
2463	/* determine the logical block number of the iag */
2464	blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2465	} else {
2466	/* no free iags. the inode map will have to be extented
2467	* to include a new iag.
2468	*/
2469
2470	/* acquire inode map lock */
2471	IWRITE_LOCK(ipimap, RDWRLOCK_IMAP);
2472
2473	if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
2474	IWRITE_UNLOCK(ipimap);
2475	IAGFREE_UNLOCK(imap);
2476	jfs_error(imap->im_ipimap->i_sb,
2477	"ipimap->i_size is wrong\n");
2478	return -EIO;
2479	}
2480
2481
2482	/* get the next available iag number */
2483	iagno = imap->im_nextiag;
2484
2485	/* make sure that we have not exceeded the maximum inode
2486	* number limit.
2487	*/
2488	if (iagno > (MAXIAGS - 1)) {
2489	/* release the inode map lock */
2490	IWRITE_UNLOCK(ipimap);
2491
2492	rc = -ENOSPC;
2493	goto out;
2494	}
2495
2496	/*
2497	* synchronously append new iag page.
2498	*/
2499	/* determine the logical address of iag page to append */
2500	blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2501
2502	/* Allocate extent for new iag page */
2503	xlen = sbi->nbperpage;
2504	if ((rc = dbAlloc(ipbmap: ipimap, hint: 0, nblocks: (s64) xlen, results: &xaddr))) {
2505	/* release the inode map lock */
2506	IWRITE_UNLOCK(ipimap);
2507
2508	goto out;
2509	}
2510
2511	/*
2512	* start transaction of update of the inode map
2513	* addressing structure pointing to the new iag page;
2514	*/
2515	tid = txBegin(sb, COMMIT_FORCE);
2516	mutex_lock(&JFS_IP(ipimap)->commit_mutex);
2517
2518	/* update the inode map addressing structure to point to it */
2519	if ((rc =
2520	xtInsert(tid, ip: ipimap, xflag: 0, xoff: blkno, xlen, xaddrp: &xaddr, flag: 0))) {
2521	txEnd(tid);
2522	mutex_unlock(lock: &JFS_IP(inode: ipimap)->commit_mutex);
2523	/* Free the blocks allocated for the iag since it was
2524	* not successfully added to the inode map
2525	*/
2526	dbFree(ipbmap: ipimap, blkno: xaddr, nblocks: (s64) xlen);
2527
2528	/* release the inode map lock */
2529	IWRITE_UNLOCK(ipimap);
2530
2531	goto out;
2532	}
2533
2534	/* update the inode map's inode to reflect the extension */
2535	ipimap->i_size += PSIZE;
2536	inode_add_bytes(inode: ipimap, PSIZE);
2537
2538	/* assign a buffer for the page */
2539	mp = get_metapage(ipimap, blkno, PSIZE, 0);
2540	if (!mp) {
2541	/*
2542	* This is very unlikely since we just created the
2543	* extent, but let's try to handle it correctly
2544	*/
2545	xtTruncate(tid, ip: ipimap, newsize: ipimap->i_size - PSIZE,
2546	COMMIT_PWMAP);
2547
2548	txAbort(tid, 0);
2549	txEnd(tid);
2550	mutex_unlock(lock: &JFS_IP(inode: ipimap)->commit_mutex);
2551
2552	/* release the inode map lock */
2553	IWRITE_UNLOCK(ipimap);
2554
2555	rc = -EIO;
2556	goto out;
2557	}
2558	iagp = (struct iag *) mp->data;
2559
2560	/* init the iag */
2561	memset(iagp, 0, sizeof(struct iag));
2562	iagp->iagnum = cpu_to_le32(iagno);
2563	iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2564	iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2565	iagp->iagfree = cpu_to_le32(-1);
2566	iagp->nfreeinos = 0;
2567	iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
2568
2569	/* initialize the free inode summary map (free extent
2570	* summary map initialization handled by bzero).
2571	*/
2572	for (i = 0; i < SMAPSZ; i++)
2573	iagp->inosmap[i] = cpu_to_le32(ONES);
2574
2575	/*
2576	* Write and sync the metapage
2577	*/
2578	flush_metapage(mp);
2579
2580	/*
2581	* txCommit(COMMIT_FORCE) will synchronously write address
2582	* index pages and inode after commit in careful update order
2583	* of address index pages (right to left, bottom up);
2584	*/
2585	iplist[0] = ipimap;
2586	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
2587
2588	txEnd(tid);
2589	mutex_unlock(lock: &JFS_IP(inode: ipimap)->commit_mutex);
2590
2591	duplicateIXtree(sb, blkno, xlen, &xaddr);
2592
2593	/* update the next available iag number */
2594	imap->im_nextiag += 1;
2595
2596	/* Add the iag to the iag free list so we don't lose the iag
2597	* if a failure happens now.
2598	*/
2599	imap->im_freeiag = iagno;
2600
2601	/* Until we have logredo working, we want the imap inode &
2602	* control page to be up to date.
2603	*/
2604	diSync(ipimap);
2605
2606	/* release the inode map lock */
2607	IWRITE_UNLOCK(ipimap);
2608	}
2609
2610	/* obtain read lock on map */
2611	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2612
2613	/* read the iag */
2614	if ((rc = diIAGRead(imap, iagno, &mp))) {
2615	IREAD_UNLOCK(ipimap);
2616	rc = -EIO;
2617	goto out;
2618	}
2619	iagp = (struct iag *) mp->data;
2620
2621	/* remove the iag from the iag free list */
2622	imap->im_freeiag = le32_to_cpu(iagp->iagfree);
2623	iagp->iagfree = cpu_to_le32(-1);
2624
2625	/* set the return iag number and buffer pointer */
2626	*iagnop = iagno;
2627	*mpp = mp;
2628
2629	out:
2630	/* release the iag free lock */
2631	IAGFREE_UNLOCK(imap);
2632
2633	return (rc);
2634	}
2635
2636	/*
2637	* NAME: diIAGRead()
2638	*
2639	* FUNCTION: get the buffer for the specified iag within a fileset
2640	* or aggregate inode map.
2641	*
2642	* PARAMETERS:
2643	* imap - pointer to inode map control structure.
2644	* iagno - iag number.
2645	* bpp - point to buffer pointer to be filled in on successful
2646	* exit.
2647	*
2648	* SERIALIZATION:
2649	* must have read lock on imap inode
2650	* (When called by diExtendFS, the filesystem is quiesced, therefore
2651	* the read lock is unnecessary.)
2652	*
2653	* RETURN VALUES:
2654	* 0 - success.
2655	* -EIO - i/o error.
2656	*/
2657	static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
2658	{
2659	struct inode *ipimap = imap->im_ipimap;
2660	s64 blkno;
2661
2662	/* compute the logical block number of the iag. */
2663	blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
2664
2665	/* read the iag. */
2666	*mpp = read_metapage(ipimap, blkno, PSIZE, 0);
2667	if (*mpp == NULL) {
2668	return -EIO;
2669	}
2670
2671	return (0);
2672	}
2673
2674	/*
2675	* NAME: diFindFree()
2676	*
2677	* FUNCTION: find the first free bit in a word starting at
2678	* the specified bit position.
2679	*
2680	* PARAMETERS:
2681	* word - word to be examined.
2682	* start - starting bit position.
2683	*
2684	* RETURN VALUES:
2685	* bit position of first free bit in the word or 32 if
2686	* no free bits were found.
2687	*/
2688	static int diFindFree(u32 word, int start)
2689	{
2690	int bitno;
2691	assert(start < 32);
2692	/* scan the word for the first free bit. */
2693	for (word <<= start, bitno = start; bitno < 32;
2694	bitno++, word <<= 1) {
2695	if ((word & HIGHORDER) == 0)
2696	break;
2697	}
2698	return (bitno);
2699	}
2700
2701	/*
2702	* NAME: diUpdatePMap()
2703	*
2704	* FUNCTION: Update the persistent map in an IAG for the allocation or
2705	* freeing of the specified inode.
2706	*
2707	* PRE CONDITIONS: Working map has already been updated for allocate.
2708	*
2709	* PARAMETERS:
2710	* ipimap - Incore inode map inode
2711	* inum - Number of inode to mark in permanent map
2712	* is_free - If 'true' indicates inode should be marked freed, otherwise
2713	* indicates inode should be marked allocated.
2714	*
2715	* RETURN VALUES:
2716	* 0 for success
2717	*/
2718	int
2719	diUpdatePMap(struct inode *ipimap,
2720	unsigned long inum, bool is_free, struct tblock * tblk)
2721	{
2722	int rc;
2723	struct iag *iagp;
2724	struct metapage *mp;
2725	int iagno, ino, extno, bitno;
2726	struct inomap *imap;
2727	u32 mask;
2728	struct jfs_log *log;
2729	int lsn, difft, diffp;
2730	unsigned long flags;
2731
2732	imap = JFS_IP(inode: ipimap)->i_imap;
2733	/* get the iag number containing the inode */
2734	iagno = INOTOIAG(inum);
2735	/* make sure that the iag is contained within the map */
2736	if (iagno >= imap->im_nextiag) {
2737	jfs_error(ipimap->i_sb, "the iag is outside the map\n");
2738	return -EIO;
2739	}
2740	/* read the iag */
2741	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2742	rc = diIAGRead(imap, iagno, mpp: &mp);
2743	IREAD_UNLOCK(ipimap);
2744	if (rc)
2745	return (rc);
2746	metapage_wait_for_io(mp);
2747	iagp = (struct iag *) mp->data;
2748	/* get the inode number and extent number of the inode within
2749	* the iag and the inode number within the extent.
2750	*/
2751	ino = inum & (INOSPERIAG - 1);
2752	extno = ino >> L2INOSPEREXT;
2753	bitno = ino & (INOSPEREXT - 1);
2754	mask = HIGHORDER >> bitno;
2755	/*
2756	* mark the inode free in persistent map:
2757	*/
2758	if (is_free) {
2759	/* The inode should have been allocated both in working
2760	* map and in persistent map;
2761	* the inode will be freed from working map at the release
2762	* of last reference release;
2763	*/
2764	if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2765	jfs_error(ipimap->i_sb,
2766	"inode %ld not marked as allocated in wmap!\n",
2767	inum);
2768	}
2769	if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
2770	jfs_error(ipimap->i_sb,
2771	"inode %ld not marked as allocated in pmap!\n",
2772	inum);
2773	}
2774	/* update the bitmap for the extent of the freed inode */
2775	iagp->pmap[extno] &= cpu_to_le32(~mask);
2776	}
2777	/*
2778	* mark the inode allocated in persistent map:
2779	*/
2780	else {
2781	/* The inode should be already allocated in the working map
2782	* and should be free in persistent map;
2783	*/
2784	if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2785	release_metapage(mp);
2786	jfs_error(ipimap->i_sb,
2787	"the inode is not allocated in the working map\n");
2788	return -EIO;
2789	}
2790	if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
2791	release_metapage(mp);
2792	jfs_error(ipimap->i_sb,
2793	"the inode is not free in the persistent map\n");
2794	return -EIO;
2795	}
2796	/* update the bitmap for the extent of the allocated inode */
2797	iagp->pmap[extno] |= cpu_to_le32(mask);
2798	}
2799	/*
2800	* update iag lsn
2801	*/
2802	lsn = tblk->lsn;
2803	log = JFS_SBI(sb: tblk->sb)->log;
2804	LOGSYNC_LOCK(log, flags);
2805	if (mp->lsn != 0) {
2806	/* inherit older/smaller lsn */
2807	logdiff(difft, lsn, log);
2808	logdiff(diffp, mp->lsn, log);
2809	if (difft < diffp) {
2810	mp->lsn = lsn;
2811	/* move mp after tblock in logsync list */
2812	list_move(list: &mp->synclist, head: &tblk->synclist);
2813	}
2814	/* inherit younger/larger clsn */
2815	assert(mp->clsn);
2816	logdiff(difft, tblk->clsn, log);
2817	logdiff(diffp, mp->clsn, log);
2818	if (difft > diffp)
2819	mp->clsn = tblk->clsn;
2820	} else {
2821	mp->log = log;
2822	mp->lsn = lsn;
2823	/* insert mp after tblock in logsync list */
2824	log->count++;
2825	list_add(new: &mp->synclist, head: &tblk->synclist);
2826	mp->clsn = tblk->clsn;
2827	}
2828	LOGSYNC_UNLOCK(log, flags);
2829	write_metapage(mp);
2830	return (0);
2831	}
2832
2833	/*
2834	* diExtendFS()
2835	*
2836	* function: update imap for extendfs();
2837	*
2838	* note: AG size has been increased s.t. each k old contiguous AGs are
2839	* coalesced into a new AG;
2840	*/
2841	int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
2842	{
2843	int rc, rcx = 0;
2844	struct inomap *imap = JFS_IP(inode: ipimap)->i_imap;
2845	struct iag *iagp = NULL, *hiagp = NULL;
2846	struct bmap *mp = JFS_SBI(sb: ipbmap->i_sb)->bmap;
2847	struct metapage *bp, *hbp;
2848	int i, n, head;
2849	int numinos, xnuminos = 0, xnumfree = 0;
2850	s64 agstart;
2851
2852	jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
2853	imap->im_nextiag, atomic_read(&imap->im_numinos),
2854	atomic_read(&imap->im_numfree));
2855
2856	/*
2857	* reconstruct imap
2858	*
2859	* coalesce contiguous k (newAGSize/oldAGSize) AGs;
2860	* i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
2861	* note: new AG size = old AG size * (2**x).
2862	*/
2863
2864	/* init per AG control information im_agctl[] */
2865	for (i = 0; i < MAXAG; i++) {
2866	imap->im_agctl[i].inofree = -1;
2867	imap->im_agctl[i].extfree = -1;
2868	imap->im_agctl[i].numinos = 0; /* number of backed inodes */
2869	imap->im_agctl[i].numfree = 0; /* number of free backed inodes */
2870	}
2871
2872	/*
2873	* process each iag page of the map.
2874	*
2875	* rebuild AG Free Inode List, AG Free Inode Extent List;
2876	*/
2877	for (i = 0; i < imap->im_nextiag; i++) {
2878	if ((rc = diIAGRead(imap, iagno: i, mpp: &bp))) {
2879	rcx = rc;
2880	continue;
2881	}
2882	iagp = (struct iag *) bp->data;
2883	if (le32_to_cpu(iagp->iagnum) != i) {
2884	release_metapage(bp);
2885	jfs_error(ipimap->i_sb, "unexpected value of iagnum\n");
2886	return -EIO;
2887	}
2888
2889	/* leave free iag in the free iag list */
2890	if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2891	release_metapage(bp);
2892	continue;
2893	}
2894
2895	agstart = le64_to_cpu(iagp->agstart);
2896	n = agstart >> mp->db_agl2size;
2897	iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
2898
2899	/* compute backed inodes */
2900	numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
2901	<< L2INOSPEREXT;
2902	if (numinos > 0) {
2903	/* merge AG backed inodes */
2904	imap->im_agctl[n].numinos += numinos;
2905	xnuminos += numinos;
2906	}
2907
2908	/* if any backed free inodes, insert at AG free inode list */
2909	if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
2910	if ((head = imap->im_agctl[n].inofree) == -1) {
2911	iagp->inofreefwd = cpu_to_le32(-1);
2912	iagp->inofreeback = cpu_to_le32(-1);
2913	} else {
2914	if ((rc = diIAGRead(imap, iagno: head, mpp: &hbp))) {
2915	rcx = rc;
2916	goto nextiag;
2917	}
2918	hiagp = (struct iag *) hbp->data;
2919	hiagp->inofreeback = iagp->iagnum;
2920	iagp->inofreefwd = cpu_to_le32(head);
2921	iagp->inofreeback = cpu_to_le32(-1);
2922	write_metapage(mp: hbp);
2923	}
2924
2925	imap->im_agctl[n].inofree =
2926	le32_to_cpu(iagp->iagnum);
2927
2928	/* merge AG backed free inodes */
2929	imap->im_agctl[n].numfree +=
2930	le32_to_cpu(iagp->nfreeinos);
2931	xnumfree += le32_to_cpu(iagp->nfreeinos);
2932	}
2933
2934	/* if any free extents, insert at AG free extent list */
2935	if (le32_to_cpu(iagp->nfreeexts) > 0) {
2936	if ((head = imap->im_agctl[n].extfree) == -1) {
2937	iagp->extfreefwd = cpu_to_le32(-1);
2938	iagp->extfreeback = cpu_to_le32(-1);
2939	} else {
2940	if ((rc = diIAGRead(imap, iagno: head, mpp: &hbp))) {
2941	rcx = rc;
2942	goto nextiag;
2943	}
2944	hiagp = (struct iag *) hbp->data;
2945	hiagp->extfreeback = iagp->iagnum;
2946	iagp->extfreefwd = cpu_to_le32(head);
2947	iagp->extfreeback = cpu_to_le32(-1);
2948	write_metapage(mp: hbp);
2949	}
2950
2951	imap->im_agctl[n].extfree =
2952	le32_to_cpu(iagp->iagnum);
2953	}
2954
2955	nextiag:
2956	write_metapage(mp: bp);
2957	}
2958
2959	if (xnuminos != atomic_read(v: &imap->im_numinos) ||
2960	xnumfree != atomic_read(v: &imap->im_numfree)) {
2961	jfs_error(ipimap->i_sb, "numinos or numfree incorrect\n");
2962	return -EIO;
2963	}
2964
2965	return rcx;
2966	}
2967
2968
2969	/*
2970	* duplicateIXtree()
2971	*
2972	* serialization: IWRITE_LOCK held on entry/exit
2973	*
2974	* note: shadow page with regular inode (rel.2);
2975	*/
2976	static void duplicateIXtree(struct super_block *sb, s64 blkno,
2977	int xlen, s64 *xaddr)
2978	{
2979	struct jfs_superblock *j_sb;
2980	struct buffer_head *bh;
2981	struct inode *ip;
2982	tid_t tid;
2983
2984	/* if AIT2 ipmap2 is bad, do not try to update it */
2985	if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */
2986	return;
2987	ip = diReadSpecial(sb, FILESYSTEM_I, secondary: 1);
2988	if (ip == NULL) {
2989	JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
2990	if (readSuper(sb, &bh))
2991	return;
2992	j_sb = (struct jfs_superblock *)bh->b_data;
2993	j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
2994
2995	mark_buffer_dirty(bh);
2996	sync_dirty_buffer(bh);
2997	brelse(bh);
2998	return;
2999	}
3000
3001	/* start transaction */
3002	tid = txBegin(sb, COMMIT_FORCE);
3003	/* update the inode map addressing structure to point to it */
3004	if (xtInsert(tid, ip, xflag: 0, xoff: blkno, xlen, xaddrp: xaddr, flag: 0)) {
3005	JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3006	txAbort(tid, 1);
3007	goto cleanup;
3008
3009	}
3010	/* update the inode map's inode to reflect the extension */
3011	ip->i_size += PSIZE;
3012	inode_add_bytes(inode: ip, PSIZE);
3013	txCommit(tid, 1, &ip, COMMIT_FORCE);
3014	cleanup:
3015	txEnd(tid);
3016	diFreeSpecial(ip);
3017	}
3018
3019	/*
3020	* NAME: copy_from_dinode()
3021	*
3022	* FUNCTION: Copies inode info from disk inode to in-memory inode
3023	*
3024	* RETURN VALUES:
3025	* 0 - success
3026	* -ENOMEM - insufficient memory
3027	*/
3028	static int copy_from_dinode(struct dinode * dip, struct inode *ip)
3029	{
3030	struct jfs_inode_info *jfs_ip = JFS_IP(inode: ip);
3031	struct jfs_sb_info *sbi = JFS_SBI(sb: ip->i_sb);
3032
3033	jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
3034	jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
3035	jfs_set_inode_flags(ip);
3036
3037	ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
3038	if (sbi->umask != -1) {
3039	ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask);
3040	/* For directories, add x permission if r is allowed by umask */
3041	if (S_ISDIR(ip->i_mode)) {
3042	if (ip->i_mode & 0400)
3043	ip->i_mode |= 0100;
3044	if (ip->i_mode & 0040)
3045	ip->i_mode |= 0010;
3046	if (ip->i_mode & 0004)
3047	ip->i_mode |= 0001;
3048	}
3049	}
3050	set_nlink(inode: ip, le32_to_cpu(dip->di_nlink));
3051
3052	jfs_ip->saved_uid = make_kuid(from: &init_user_ns, le32_to_cpu(dip->di_uid));
3053	if (!uid_valid(uid: sbi->uid))
3054	ip->i_uid = jfs_ip->saved_uid;
3055	else {
3056	ip->i_uid = sbi->uid;
3057	}
3058
3059	jfs_ip->saved_gid = make_kgid(from: &init_user_ns, le32_to_cpu(dip->di_gid));
3060	if (!gid_valid(gid: sbi->gid))
3061	ip->i_gid = jfs_ip->saved_gid;
3062	else {
3063	ip->i_gid = sbi->gid;
3064	}
3065
3066	ip->i_size = le64_to_cpu(dip->di_size);
3067	inode_set_atime(inode: ip, le32_to_cpu(dip->di_atime.tv_sec),
3068	le32_to_cpu(dip->di_atime.tv_nsec));
3069	inode_set_mtime(inode: ip, le32_to_cpu(dip->di_mtime.tv_sec),
3070	le32_to_cpu(dip->di_mtime.tv_nsec));
3071	inode_set_ctime(inode: ip, le32_to_cpu(dip->di_ctime.tv_sec),
3072	le32_to_cpu(dip->di_ctime.tv_nsec));
3073	ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
3074	ip->i_generation = le32_to_cpu(dip->di_gen);
3075
3076	jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */
3077	jfs_ip->acl = dip->di_acl; /* as are dxd's */
3078	jfs_ip->ea = dip->di_ea;
3079	jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
3080	jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
3081	jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
3082
3083	if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
3084	jfs_ip->dev = le32_to_cpu(dip->di_rdev);
3085	ip->i_rdev = new_decode_dev(dev: jfs_ip->dev);
3086	}
3087
3088	if (S_ISDIR(ip->i_mode)) {
3089	memcpy(&jfs_ip->u.dir, &dip->u._dir, 384);
3090	} else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
3091	memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
3092	} else
3093	memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
3094
3095	/* Zero the in-memory-only stuff */
3096	jfs_ip->cflag = 0;
3097	jfs_ip->btindex = 0;
3098	jfs_ip->btorder = 0;
3099	jfs_ip->bxflag = 0;
3100	jfs_ip->blid = 0;
3101	jfs_ip->atlhead = 0;
3102	jfs_ip->atltail = 0;
3103	jfs_ip->xtlid = 0;
3104	return (0);
3105	}
3106
3107	/*
3108	* NAME: copy_to_dinode()
3109	*
3110	* FUNCTION: Copies inode info from in-memory inode to disk inode
3111	*/
3112	static void copy_to_dinode(struct dinode * dip, struct inode *ip)
3113	{
3114	struct jfs_inode_info *jfs_ip = JFS_IP(inode: ip);
3115	struct jfs_sb_info *sbi = JFS_SBI(sb: ip->i_sb);
3116
3117	dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
3118	dip->di_inostamp = cpu_to_le32(sbi->inostamp);
3119	dip->di_number = cpu_to_le32(ip->i_ino);
3120	dip->di_gen = cpu_to_le32(ip->i_generation);
3121	dip->di_size = cpu_to_le64(ip->i_size);
3122	dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
3123	dip->di_nlink = cpu_to_le32(ip->i_nlink);
3124	if (!uid_valid(uid: sbi->uid))
3125	dip->di_uid = cpu_to_le32(i_uid_read(ip));
3126	else
3127	dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns,
3128	jfs_ip->saved_uid));
3129	if (!gid_valid(gid: sbi->gid))
3130	dip->di_gid = cpu_to_le32(i_gid_read(ip));
3131	else
3132	dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns,
3133	jfs_ip->saved_gid));
3134	/*
3135	* mode2 is only needed for storing the higher order bits.
3136	* Trust i_mode for the lower order ones
3137	*/
3138	if (sbi->umask == -1)
3139	dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) |
3140	ip->i_mode);
3141	else /* Leave the original permissions alone */
3142	dip->di_mode = cpu_to_le32(jfs_ip->mode2);
3143
3144	dip->di_atime.tv_sec = cpu_to_le32(inode_get_atime_sec(ip));
3145	dip->di_atime.tv_nsec = cpu_to_le32(inode_get_atime_nsec(ip));
3146	dip->di_ctime.tv_sec = cpu_to_le32(inode_get_ctime_sec(ip));
3147	dip->di_ctime.tv_nsec = cpu_to_le32(inode_get_ctime_nsec(ip));
3148	dip->di_mtime.tv_sec = cpu_to_le32(inode_get_mtime_sec(ip));
3149	dip->di_mtime.tv_nsec = cpu_to_le32(inode_get_mtime_nsec(ip));
3150	dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */
3151	dip->di_acl = jfs_ip->acl; /* as are dxd's */
3152	dip->di_ea = jfs_ip->ea;
3153	dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
3154	dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
3155	dip->di_otime.tv_nsec = 0;
3156	dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
3157	if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
3158	dip->di_rdev = cpu_to_le32(jfs_ip->dev);
3159	}
3160