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1/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19/*
20 * jfs_imap.c: inode allocation map manager
21 *
22 * Serialization:
23 * Each AG has a simple lock which is used to control the serialization of
24 * the AG level lists. This lock should be taken first whenever an AG
25 * level list will be modified or accessed.
26 *
27 * Each IAG is locked by obtaining the buffer for the IAG page.
28 *
29 * There is also a inode lock for the inode map inode. A read lock needs to
30 * be taken whenever an IAG is read from the map or the global level
31 * information is read. A write lock needs to be taken whenever the global
32 * level information is modified or an atomic operation needs to be used.
33 *
34 * If more than one IAG is read at one time, the read lock may not
35 * be given up until all of the IAG's are read. Otherwise, a deadlock
36 * may occur when trying to obtain the read lock while another thread
37 * holding the read lock is waiting on the IAG already being held.
38 *
39 * The control page of the inode map is read into memory by diMount().
40 * Thereafter it should only be modified in memory and then it will be
41 * written out when the filesystem is unmounted by diUnmount().
42 */
43
44#include <linux/fs.h>
45#include <linux/buffer_head.h>
46#include <linux/pagemap.h>
47#include <linux/quotaops.h>
48#include <linux/slab.h>
49
50#include "jfs_incore.h"
51#include "jfs_inode.h"
52#include "jfs_filsys.h"
53#include "jfs_dinode.h"
54#include "jfs_dmap.h"
55#include "jfs_imap.h"
56#include "jfs_metapage.h"
57#include "jfs_superblock.h"
58#include "jfs_debug.h"
59
60/*
61 * imap locks
62 */
63/* iag free list lock */
64#define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock)
65#define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock)
66#define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock)
67
68/* per ag iag list locks */
69#define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index]))
70#define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno])
71#define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno])
72
73/*
74 * forward references
75 */
76static int diAllocAG(struct inomap *, int, bool, struct inode *);
77static int diAllocAny(struct inomap *, int, bool, struct inode *);
78static int diAllocBit(struct inomap *, struct iag *, int);
79static int diAllocExt(struct inomap *, int, struct inode *);
80static int diAllocIno(struct inomap *, int, struct inode *);
81static int diFindFree(u32, int);
82static int diNewExt(struct inomap *, struct iag *, int);
83static int diNewIAG(struct inomap *, int *, int, struct metapage **);
84static void duplicateIXtree(struct super_block *, s64, int, s64 *);
85
86static int diIAGRead(struct inomap * imap, int, struct metapage **);
87static int copy_from_dinode(struct dinode *, struct inode *);
88static void copy_to_dinode(struct dinode *, struct inode *);
89
90/*
91 * NAME: diMount()
92 *
93 * FUNCTION: initialize the incore inode map control structures for
94 * a fileset or aggregate init time.
95 *
96 * the inode map's control structure (dinomap) is
97 * brought in from disk and placed in virtual memory.
98 *
99 * PARAMETERS:
100 * ipimap - pointer to inode map inode for the aggregate or fileset.
101 *
102 * RETURN VALUES:
103 * 0 - success
104 * -ENOMEM - insufficient free virtual memory.
105 * -EIO - i/o error.
106 */
107int diMount(struct inode *ipimap)
108{
109 struct inomap *imap;
110 struct metapage *mp;
111 int index;
112 struct dinomap_disk *dinom_le;
113
114 /*
115 * allocate/initialize the in-memory inode map control structure
116 */
117 /* allocate the in-memory inode map control structure. */
118 imap = kmalloc(sizeof(struct inomap), GFP_KERNEL);
119 if (imap == NULL) {
120 jfs_err("diMount: kmalloc returned NULL!");
121 return -ENOMEM;
122 }
123
124 /* read the on-disk inode map control structure. */
125
126 mp = read_metapage(ipimap,
127 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
128 PSIZE, 0);
129 if (mp == NULL) {
130 kfree(imap);
131 return -EIO;
132 }
133
134 /* copy the on-disk version to the in-memory version. */
135 dinom_le = (struct dinomap_disk *) mp->data;
136 imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
137 imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
138 atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
139 atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
140 imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
141 imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
142 for (index = 0; index < MAXAG; index++) {
143 imap->im_agctl[index].inofree =
144 le32_to_cpu(dinom_le->in_agctl[index].inofree);
145 imap->im_agctl[index].extfree =
146 le32_to_cpu(dinom_le->in_agctl[index].extfree);
147 imap->im_agctl[index].numinos =
148 le32_to_cpu(dinom_le->in_agctl[index].numinos);
149 imap->im_agctl[index].numfree =
150 le32_to_cpu(dinom_le->in_agctl[index].numfree);
151 }
152
153 /* release the buffer. */
154 release_metapage(mp);
155
156 /*
157 * allocate/initialize inode allocation map locks
158 */
159 /* allocate and init iag free list lock */
160 IAGFREE_LOCK_INIT(imap);
161
162 /* allocate and init ag list locks */
163 for (index = 0; index < MAXAG; index++) {
164 AG_LOCK_INIT(imap, index);
165 }
166
167 /* bind the inode map inode and inode map control structure
168 * to each other.
169 */
170 imap->im_ipimap = ipimap;
171 JFS_IP(ipimap)->i_imap = imap;
172
173 return (0);
174}
175
176
177/*
178 * NAME: diUnmount()
179 *
180 * FUNCTION: write to disk the incore inode map control structures for
181 * a fileset or aggregate at unmount time.
182 *
183 * PARAMETERS:
184 * ipimap - pointer to inode map inode for the aggregate or fileset.
185 *
186 * RETURN VALUES:
187 * 0 - success
188 * -ENOMEM - insufficient free virtual memory.
189 * -EIO - i/o error.
190 */
191int diUnmount(struct inode *ipimap, int mounterror)
192{
193 struct inomap *imap = JFS_IP(ipimap)->i_imap;
194
195 /*
196 * update the on-disk inode map control structure
197 */
198
199 if (!(mounterror || isReadOnly(ipimap)))
200 diSync(ipimap);
201
202 /*
203 * Invalidate the page cache buffers
204 */
205 truncate_inode_pages(ipimap->i_mapping, 0);
206
207 /*
208 * free in-memory control structure
209 */
210 kfree(imap);
211
212 return (0);
213}
214
215
216/*
217 * diSync()
218 */
219int diSync(struct inode *ipimap)
220{
221 struct dinomap_disk *dinom_le;
222 struct inomap *imp = JFS_IP(ipimap)->i_imap;
223 struct metapage *mp;
224 int index;
225
226 /*
227 * write imap global conrol page
228 */
229 /* read the on-disk inode map control structure */
230 mp = get_metapage(ipimap,
231 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
232 PSIZE, 0);
233 if (mp == NULL) {
234 jfs_err("diSync: get_metapage failed!");
235 return -EIO;
236 }
237
238 /* copy the in-memory version to the on-disk version */
239 dinom_le = (struct dinomap_disk *) mp->data;
240 dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
241 dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
242 dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
243 dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
244 dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
245 dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
246 for (index = 0; index < MAXAG; index++) {
247 dinom_le->in_agctl[index].inofree =
248 cpu_to_le32(imp->im_agctl[index].inofree);
249 dinom_le->in_agctl[index].extfree =
250 cpu_to_le32(imp->im_agctl[index].extfree);
251 dinom_le->in_agctl[index].numinos =
252 cpu_to_le32(imp->im_agctl[index].numinos);
253 dinom_le->in_agctl[index].numfree =
254 cpu_to_le32(imp->im_agctl[index].numfree);
255 }
256
257 /* write out the control structure */
258 write_metapage(mp);
259
260 /*
261 * write out dirty pages of imap
262 */
263 filemap_write_and_wait(ipimap->i_mapping);
264
265 diWriteSpecial(ipimap, 0);
266
267 return (0);
268}
269
270
271/*
272 * NAME: diRead()
273 *
274 * FUNCTION: initialize an incore inode from disk.
275 *
276 * on entry, the specifed incore inode should itself
277 * specify the disk inode number corresponding to the
278 * incore inode (i.e. i_number should be initialized).
279 *
280 * this routine handles incore inode initialization for
281 * both "special" and "regular" inodes. special inodes
282 * are those required early in the mount process and
283 * require special handling since much of the file system
284 * is not yet initialized. these "special" inodes are
285 * identified by a NULL inode map inode pointer and are
286 * actually initialized by a call to diReadSpecial().
287 *
288 * for regular inodes, the iag describing the disk inode
289 * is read from disk to determine the inode extent address
290 * for the disk inode. with the inode extent address in
291 * hand, the page of the extent that contains the disk
292 * inode is read and the disk inode is copied to the
293 * incore inode.
294 *
295 * PARAMETERS:
296 * ip - pointer to incore inode to be initialized from disk.
297 *
298 * RETURN VALUES:
299 * 0 - success
300 * -EIO - i/o error.
301 * -ENOMEM - insufficient memory
302 *
303 */
304int diRead(struct inode *ip)
305{
306 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
307 int iagno, ino, extno, rc;
308 struct inode *ipimap;
309 struct dinode *dp;
310 struct iag *iagp;
311 struct metapage *mp;
312 s64 blkno, agstart;
313 struct inomap *imap;
314 int block_offset;
315 int inodes_left;
316 unsigned long pageno;
317 int rel_inode;
318
319 jfs_info("diRead: ino = %ld", ip->i_ino);
320
321 ipimap = sbi->ipimap;
322 JFS_IP(ip)->ipimap = ipimap;
323
324 /* determine the iag number for this inode (number) */
325 iagno = INOTOIAG(ip->i_ino);
326
327 /* read the iag */
328 imap = JFS_IP(ipimap)->i_imap;
329 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
330 rc = diIAGRead(imap, iagno, &mp);
331 IREAD_UNLOCK(ipimap);
332 if (rc) {
333 jfs_err("diRead: diIAGRead returned %d", rc);
334 return (rc);
335 }
336
337 iagp = (struct iag *) mp->data;
338
339 /* determine inode extent that holds the disk inode */
340 ino = ip->i_ino & (INOSPERIAG - 1);
341 extno = ino >> L2INOSPEREXT;
342
343 if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) ||
344 (addressPXD(&iagp->inoext[extno]) == 0)) {
345 release_metapage(mp);
346 return -ESTALE;
347 }
348
349 /* get disk block number of the page within the inode extent
350 * that holds the disk inode.
351 */
352 blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);
353
354 /* get the ag for the iag */
355 agstart = le64_to_cpu(iagp->agstart);
356
357 release_metapage(mp);
358
359 rel_inode = (ino & (INOSPERPAGE - 1));
360 pageno = blkno >> sbi->l2nbperpage;
361
362 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
363 /*
364 * OS/2 didn't always align inode extents on page boundaries
365 */
366 inodes_left =
367 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
368
369 if (rel_inode < inodes_left)
370 rel_inode += block_offset << sbi->l2niperblk;
371 else {
372 pageno += 1;
373 rel_inode -= inodes_left;
374 }
375 }
376
377 /* read the page of disk inode */
378 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
379 if (!mp) {
380 jfs_err("diRead: read_metapage failed");
381 return -EIO;
382 }
383
384 /* locate the disk inode requested */
385 dp = (struct dinode *) mp->data;
386 dp += rel_inode;
387
388 if (ip->i_ino != le32_to_cpu(dp->di_number)) {
389 jfs_error(ip->i_sb, "i_ino != di_number\n");
390 rc = -EIO;
391 } else if (le32_to_cpu(dp->di_nlink) == 0)
392 rc = -ESTALE;
393 else
394 /* copy the disk inode to the in-memory inode */
395 rc = copy_from_dinode(dp, ip);
396
397 release_metapage(mp);
398
399 /* set the ag for the inode */
400 JFS_IP(ip)->agstart = agstart;
401 JFS_IP(ip)->active_ag = -1;
402
403 return (rc);
404}
405
406
407/*
408 * NAME: diReadSpecial()
409 *
410 * FUNCTION: initialize a 'special' inode from disk.
411 *
412 * this routines handles aggregate level inodes. The
413 * inode cache cannot differentiate between the
414 * aggregate inodes and the filesystem inodes, so we
415 * handle these here. We don't actually use the aggregate
416 * inode map, since these inodes are at a fixed location
417 * and in some cases the aggregate inode map isn't initialized
418 * yet.
419 *
420 * PARAMETERS:
421 * sb - filesystem superblock
422 * inum - aggregate inode number
423 * secondary - 1 if secondary aggregate inode table
424 *
425 * RETURN VALUES:
426 * new inode - success
427 * NULL - i/o error.
428 */
429struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
430{
431 struct jfs_sb_info *sbi = JFS_SBI(sb);
432 uint address;
433 struct dinode *dp;
434 struct inode *ip;
435 struct metapage *mp;
436
437 ip = new_inode(sb);
438 if (ip == NULL) {
439 jfs_err("diReadSpecial: new_inode returned NULL!");
440 return ip;
441 }
442
443 if (secondary) {
444 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
445 JFS_IP(ip)->ipimap = sbi->ipaimap2;
446 } else {
447 address = AITBL_OFF >> L2PSIZE;
448 JFS_IP(ip)->ipimap = sbi->ipaimap;
449 }
450
451 ASSERT(inum < INOSPEREXT);
452
453 ip->i_ino = inum;
454
455 address += inum >> 3; /* 8 inodes per 4K page */
456
457 /* read the page of fixed disk inode (AIT) in raw mode */
458 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
459 if (mp == NULL) {
460 set_nlink(ip, 1); /* Don't want iput() deleting it */
461 iput(ip);
462 return (NULL);
463 }
464
465 /* get the pointer to the disk inode of interest */
466 dp = (struct dinode *) (mp->data);
467 dp += inum % 8; /* 8 inodes per 4K page */
468
469 /* copy on-disk inode to in-memory inode */
470 if ((copy_from_dinode(dp, ip)) != 0) {
471 /* handle bad return by returning NULL for ip */
472 set_nlink(ip, 1); /* Don't want iput() deleting it */
473 iput(ip);
474 /* release the page */
475 release_metapage(mp);
476 return (NULL);
477
478 }
479
480 ip->i_mapping->a_ops = &jfs_metapage_aops;
481 mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);
482
483 /* Allocations to metadata inodes should not affect quotas */
484 ip->i_flags |= S_NOQUOTA;
485
486 if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
487 sbi->gengen = le32_to_cpu(dp->di_gengen);
488 sbi->inostamp = le32_to_cpu(dp->di_inostamp);
489 }
490
491 /* release the page */
492 release_metapage(mp);
493
494 /*
495 * __mark_inode_dirty expects inodes to be hashed. Since we don't
496 * want special inodes in the fileset inode space, we make them
497 * appear hashed, but do not put on any lists. hlist_del()
498 * will work fine and require no locking.
499 */
500 hlist_add_fake(&ip->i_hash);
501
502 return (ip);
503}
504
505/*
506 * NAME: diWriteSpecial()
507 *
508 * FUNCTION: Write the special inode to disk
509 *
510 * PARAMETERS:
511 * ip - special inode
512 * secondary - 1 if secondary aggregate inode table
513 *
514 * RETURN VALUES: none
515 */
516
517void diWriteSpecial(struct inode *ip, int secondary)
518{
519 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
520 uint address;
521 struct dinode *dp;
522 ino_t inum = ip->i_ino;
523 struct metapage *mp;
524
525 if (secondary)
526 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
527 else
528 address = AITBL_OFF >> L2PSIZE;
529
530 ASSERT(inum < INOSPEREXT);
531
532 address += inum >> 3; /* 8 inodes per 4K page */
533
534 /* read the page of fixed disk inode (AIT) in raw mode */
535 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
536 if (mp == NULL) {
537 jfs_err("diWriteSpecial: failed to read aggregate inode extent!");
538 return;
539 }
540
541 /* get the pointer to the disk inode of interest */
542 dp = (struct dinode *) (mp->data);
543 dp += inum % 8; /* 8 inodes per 4K page */
544
545 /* copy on-disk inode to in-memory inode */
546 copy_to_dinode(dp, ip);
547 memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
548
549 if (inum == FILESYSTEM_I)
550 dp->di_gengen = cpu_to_le32(sbi->gengen);
551
552 /* write the page */
553 write_metapage(mp);
554}
555
556/*
557 * NAME: diFreeSpecial()
558 *
559 * FUNCTION: Free allocated space for special inode
560 */
561void diFreeSpecial(struct inode *ip)
562{
563 if (ip == NULL) {
564 jfs_err("diFreeSpecial called with NULL ip!");
565 return;
566 }
567 filemap_write_and_wait(ip->i_mapping);
568 truncate_inode_pages(ip->i_mapping, 0);
569 iput(ip);
570}
571
572
573
574/*
575 * NAME: diWrite()
576 *
577 * FUNCTION: write the on-disk inode portion of the in-memory inode
578 * to its corresponding on-disk inode.
579 *
580 * on entry, the specifed incore inode should itself
581 * specify the disk inode number corresponding to the
582 * incore inode (i.e. i_number should be initialized).
583 *
584 * the inode contains the inode extent address for the disk
585 * inode. with the inode extent address in hand, the
586 * page of the extent that contains the disk inode is
587 * read and the disk inode portion of the incore inode
588 * is copied to the disk inode.
589 *
590 * PARAMETERS:
591 * tid - transacation id
592 * ip - pointer to incore inode to be written to the inode extent.
593 *
594 * RETURN VALUES:
595 * 0 - success
596 * -EIO - i/o error.
597 */
598int diWrite(tid_t tid, struct inode *ip)
599{
600 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
601 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
602 int rc = 0;
603 s32 ino;
604 struct dinode *dp;
605 s64 blkno;
606 int block_offset;
607 int inodes_left;
608 struct metapage *mp;
609 unsigned long pageno;
610 int rel_inode;
611 int dioffset;
612 struct inode *ipimap;
613 uint type;
614 lid_t lid;
615 struct tlock *ditlck, *tlck;
616 struct linelock *dilinelock, *ilinelock;
617 struct lv *lv;
618 int n;
619
620 ipimap = jfs_ip->ipimap;
621
622 ino = ip->i_ino & (INOSPERIAG - 1);
623
624 if (!addressPXD(&(jfs_ip->ixpxd)) ||
625 (lengthPXD(&(jfs_ip->ixpxd)) !=
626 JFS_IP(ipimap)->i_imap->im_nbperiext)) {
627 jfs_error(ip->i_sb, "ixpxd invalid\n");
628 return -EIO;
629 }
630
631 /*
632 * read the page of disk inode containing the specified inode:
633 */
634 /* compute the block address of the page */
635 blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
636
637 rel_inode = (ino & (INOSPERPAGE - 1));
638 pageno = blkno >> sbi->l2nbperpage;
639
640 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
641 /*
642 * OS/2 didn't always align inode extents on page boundaries
643 */
644 inodes_left =
645 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
646
647 if (rel_inode < inodes_left)
648 rel_inode += block_offset << sbi->l2niperblk;
649 else {
650 pageno += 1;
651 rel_inode -= inodes_left;
652 }
653 }
654 /* read the page of disk inode */
655 retry:
656 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
657 if (!mp)
658 return -EIO;
659
660 /* get the pointer to the disk inode */
661 dp = (struct dinode *) mp->data;
662 dp += rel_inode;
663
664 dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
665
666 /*
667 * acquire transaction lock on the on-disk inode;
668 * N.B. tlock is acquired on ipimap not ip;
669 */
670 if ((ditlck =
671 txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
672 goto retry;
673 dilinelock = (struct linelock *) & ditlck->lock;
674
675 /*
676 * copy btree root from in-memory inode to on-disk inode
677 *
678 * (tlock is taken from inline B+-tree root in in-memory
679 * inode when the B+-tree root is updated, which is pointed
680 * by jfs_ip->blid as well as being on tx tlock list)
681 *
682 * further processing of btree root is based on the copy
683 * in in-memory inode, where txLog() will log from, and,
684 * for xtree root, txUpdateMap() will update map and reset
685 * XAD_NEW bit;
686 */
687
688 if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
689 /*
690 * This is the special xtree inside the directory for storing
691 * the directory table
692 */
693 xtpage_t *p, *xp;
694 xad_t *xad;
695
696 jfs_ip->xtlid = 0;
697 tlck = lid_to_tlock(lid);
698 assert(tlck->type & tlckXTREE);
699 tlck->type |= tlckBTROOT;
700 tlck->mp = mp;
701 ilinelock = (struct linelock *) & tlck->lock;
702
703 /*
704 * copy xtree root from inode to dinode:
705 */
706 p = &jfs_ip->i_xtroot;
707 xp = (xtpage_t *) &dp->di_dirtable;
708 lv = ilinelock->lv;
709 for (n = 0; n < ilinelock->index; n++, lv++) {
710 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
711 lv->length << L2XTSLOTSIZE);
712 }
713
714 /* reset on-disk (metadata page) xtree XAD_NEW bit */
715 xad = &xp->xad[XTENTRYSTART];
716 for (n = XTENTRYSTART;
717 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
718 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
719 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
720 }
721
722 if ((lid = jfs_ip->blid) == 0)
723 goto inlineData;
724 jfs_ip->blid = 0;
725
726 tlck = lid_to_tlock(lid);
727 type = tlck->type;
728 tlck->type |= tlckBTROOT;
729 tlck->mp = mp;
730 ilinelock = (struct linelock *) & tlck->lock;
731
732 /*
733 * regular file: 16 byte (XAD slot) granularity
734 */
735 if (type & tlckXTREE) {
736 xtpage_t *p, *xp;
737 xad_t *xad;
738
739 /*
740 * copy xtree root from inode to dinode:
741 */
742 p = &jfs_ip->i_xtroot;
743 xp = &dp->di_xtroot;
744 lv = ilinelock->lv;
745 for (n = 0; n < ilinelock->index; n++, lv++) {
746 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
747 lv->length << L2XTSLOTSIZE);
748 }
749
750 /* reset on-disk (metadata page) xtree XAD_NEW bit */
751 xad = &xp->xad[XTENTRYSTART];
752 for (n = XTENTRYSTART;
753 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
754 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
755 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
756 }
757 /*
758 * directory: 32 byte (directory entry slot) granularity
759 */
760 else if (type & tlckDTREE) {
761 dtpage_t *p, *xp;
762
763 /*
764 * copy dtree root from inode to dinode:
765 */
766 p = (dtpage_t *) &jfs_ip->i_dtroot;
767 xp = (dtpage_t *) & dp->di_dtroot;
768 lv = ilinelock->lv;
769 for (n = 0; n < ilinelock->index; n++, lv++) {
770 memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
771 lv->length << L2DTSLOTSIZE);
772 }
773 } else {
774 jfs_err("diWrite: UFO tlock");
775 }
776
777 inlineData:
778 /*
779 * copy inline symlink from in-memory inode to on-disk inode
780 */
781 if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
782 lv = & dilinelock->lv[dilinelock->index];
783 lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
784 lv->length = 2;
785 memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
786 dilinelock->index++;
787 }
788 /*
789 * copy inline data from in-memory inode to on-disk inode:
790 * 128 byte slot granularity
791 */
792 if (test_cflag(COMMIT_Inlineea, ip)) {
793 lv = & dilinelock->lv[dilinelock->index];
794 lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
795 lv->length = 1;
796 memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
797 dilinelock->index++;
798
799 clear_cflag(COMMIT_Inlineea, ip);
800 }
801
802 /*
803 * lock/copy inode base: 128 byte slot granularity
804 */
805 lv = & dilinelock->lv[dilinelock->index];
806 lv->offset = dioffset >> L2INODESLOTSIZE;
807 copy_to_dinode(dp, ip);
808 if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
809 lv->length = 2;
810 memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
811 } else
812 lv->length = 1;
813 dilinelock->index++;
814
815 /* release the buffer holding the updated on-disk inode.
816 * the buffer will be later written by commit processing.
817 */
818 write_metapage(mp);
819
820 return (rc);
821}
822
823
824/*
825 * NAME: diFree(ip)
826 *
827 * FUNCTION: free a specified inode from the inode working map
828 * for a fileset or aggregate.
829 *
830 * if the inode to be freed represents the first (only)
831 * free inode within the iag, the iag will be placed on
832 * the ag free inode list.
833 *
834 * freeing the inode will cause the inode extent to be
835 * freed if the inode is the only allocated inode within
836 * the extent. in this case all the disk resource backing
837 * up the inode extent will be freed. in addition, the iag
838 * will be placed on the ag extent free list if the extent
839 * is the first free extent in the iag. if freeing the
840 * extent also means that no free inodes will exist for
841 * the iag, the iag will also be removed from the ag free
842 * inode list.
843 *
844 * the iag describing the inode will be freed if the extent
845 * is to be freed and it is the only backed extent within
846 * the iag. in this case, the iag will be removed from the
847 * ag free extent list and ag free inode list and placed on
848 * the inode map's free iag list.
849 *
850 * a careful update approach is used to provide consistency
851 * in the face of updates to multiple buffers. under this
852 * approach, all required buffers are obtained before making
853 * any updates and are held until all updates are complete.
854 *
855 * PARAMETERS:
856 * ip - inode to be freed.
857 *
858 * RETURN VALUES:
859 * 0 - success
860 * -EIO - i/o error.
861 */
862int diFree(struct inode *ip)
863{
864 int rc;
865 ino_t inum = ip->i_ino;
866 struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
867 struct metapage *mp, *amp, *bmp, *cmp, *dmp;
868 int iagno, ino, extno, bitno, sword, agno;
869 int back, fwd;
870 u32 bitmap, mask;
871 struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
872 struct inomap *imap = JFS_IP(ipimap)->i_imap;
873 pxd_t freepxd;
874 tid_t tid;
875 struct inode *iplist[3];
876 struct tlock *tlck;
877 struct pxd_lock *pxdlock;
878
879 /*
880 * This is just to suppress compiler warnings. The same logic that
881 * references these variables is used to initialize them.
882 */
883 aiagp = biagp = ciagp = diagp = NULL;
884
885 /* get the iag number containing the inode.
886 */
887 iagno = INOTOIAG(inum);
888
889 /* make sure that the iag is contained within
890 * the map.
891 */
892 if (iagno >= imap->im_nextiag) {
893 print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4,
894 imap, 32, 0);
895 jfs_error(ip->i_sb, "inum = %d, iagno = %d, nextiag = %d\n",
896 (uint) inum, iagno, imap->im_nextiag);
897 return -EIO;
898 }
899
900 /* get the allocation group for this ino.
901 */
902 agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
903
904 /* Lock the AG specific inode map information
905 */
906 AG_LOCK(imap, agno);
907
908 /* Obtain read lock in imap inode. Don't release it until we have
909 * read all of the IAG's that we are going to.
910 */
911 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
912
913 /* read the iag.
914 */
915 if ((rc = diIAGRead(imap, iagno, &mp))) {
916 IREAD_UNLOCK(ipimap);
917 AG_UNLOCK(imap, agno);
918 return (rc);
919 }
920 iagp = (struct iag *) mp->data;
921
922 /* get the inode number and extent number of the inode within
923 * the iag and the inode number within the extent.
924 */
925 ino = inum & (INOSPERIAG - 1);
926 extno = ino >> L2INOSPEREXT;
927 bitno = ino & (INOSPEREXT - 1);
928 mask = HIGHORDER >> bitno;
929
930 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
931 jfs_error(ip->i_sb, "wmap shows inode already free\n");
932 }
933
934 if (!addressPXD(&iagp->inoext[extno])) {
935 release_metapage(mp);
936 IREAD_UNLOCK(ipimap);
937 AG_UNLOCK(imap, agno);
938 jfs_error(ip->i_sb, "invalid inoext\n");
939 return -EIO;
940 }
941
942 /* compute the bitmap for the extent reflecting the freed inode.
943 */
944 bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
945
946 if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
947 release_metapage(mp);
948 IREAD_UNLOCK(ipimap);
949 AG_UNLOCK(imap, agno);
950 jfs_error(ip->i_sb, "numfree > numinos\n");
951 return -EIO;
952 }
953 /*
954 * inode extent still has some inodes or below low water mark:
955 * keep the inode extent;
956 */
957 if (bitmap ||
958 imap->im_agctl[agno].numfree < 96 ||
959 (imap->im_agctl[agno].numfree < 288 &&
960 (((imap->im_agctl[agno].numfree * 100) /
961 imap->im_agctl[agno].numinos) <= 25))) {
962 /* if the iag currently has no free inodes (i.e.,
963 * the inode being freed is the first free inode of iag),
964 * insert the iag at head of the inode free list for the ag.
965 */
966 if (iagp->nfreeinos == 0) {
967 /* check if there are any iags on the ag inode
968 * free list. if so, read the first one so that
969 * we can link the current iag onto the list at
970 * the head.
971 */
972 if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
973 /* read the iag that currently is the head
974 * of the list.
975 */
976 if ((rc = diIAGRead(imap, fwd, &))) {
977 IREAD_UNLOCK(ipimap);
978 AG_UNLOCK(imap, agno);
979 release_metapage(mp);
980 return (rc);
981 }
982 aiagp = (struct iag *) amp->data;
983
984 /* make current head point back to the iag.
985 */
986 aiagp->inofreeback = cpu_to_le32(iagno);
987
988 write_metapage(amp);
989 }
990
991 /* iag points forward to current head and iag
992 * becomes the new head of the list.
993 */
994 iagp->inofreefwd =
995 cpu_to_le32(imap->im_agctl[agno].inofree);
996 iagp->inofreeback = cpu_to_le32(-1);
997 imap->im_agctl[agno].inofree = iagno;
998 }
999 IREAD_UNLOCK(ipimap);
1000
1001 /* update the free inode summary map for the extent if
1002 * freeing the inode means the extent will now have free
1003 * inodes (i.e., the inode being freed is the first free
1004 * inode of extent),
1005 */
1006 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
1007 sword = extno >> L2EXTSPERSUM;
1008 bitno = extno & (EXTSPERSUM - 1);
1009 iagp->inosmap[sword] &=
1010 cpu_to_le32(~(HIGHORDER >> bitno));
1011 }
1012
1013 /* update the bitmap.
1014 */
1015 iagp->wmap[extno] = cpu_to_le32(bitmap);
1016
1017 /* update the free inode counts at the iag, ag and
1018 * map level.
1019 */
1020 le32_add_cpu(&iagp->nfreeinos, 1);
1021 imap->im_agctl[agno].numfree += 1;
1022 atomic_inc(&imap->im_numfree);
1023
1024 /* release the AG inode map lock
1025 */
1026 AG_UNLOCK(imap, agno);
1027
1028 /* write the iag */
1029 write_metapage(mp);
1030
1031 return (0);
1032 }
1033
1034
1035 /*
1036 * inode extent has become free and above low water mark:
1037 * free the inode extent;
1038 */
1039
1040 /*
1041 * prepare to update iag list(s) (careful update step 1)
1042 */
1043 amp = bmp = cmp = dmp = NULL;
1044 fwd = back = -1;
1045
1046 /* check if the iag currently has no free extents. if so,
1047 * it will be placed on the head of the ag extent free list.
1048 */
1049 if (iagp->nfreeexts == 0) {
1050 /* check if the ag extent free list has any iags.
1051 * if so, read the iag at the head of the list now.
1052 * this (head) iag will be updated later to reflect
1053 * the addition of the current iag at the head of
1054 * the list.
1055 */
1056 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
1057 if ((rc = diIAGRead(imap, fwd, &)))
1058 goto error_out;
1059 aiagp = (struct iag *) amp->data;
1060 }
1061 } else {
1062 /* iag has free extents. check if the addition of a free
1063 * extent will cause all extents to be free within this
1064 * iag. if so, the iag will be removed from the ag extent
1065 * free list and placed on the inode map's free iag list.
1066 */
1067 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1068 /* in preparation for removing the iag from the
1069 * ag extent free list, read the iags preceding
1070 * and following the iag on the ag extent free
1071 * list.
1072 */
1073 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
1074 if ((rc = diIAGRead(imap, fwd, &)))
1075 goto error_out;
1076 aiagp = (struct iag *) amp->data;
1077 }
1078
1079 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
1080 if ((rc = diIAGRead(imap, back, &bmp)))
1081 goto error_out;
1082 biagp = (struct iag *) bmp->data;
1083 }
1084 }
1085 }
1086
1087 /* remove the iag from the ag inode free list if freeing
1088 * this extent cause the iag to have no free inodes.
1089 */
1090 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1091 int inofreeback = le32_to_cpu(iagp->inofreeback);
1092 int inofreefwd = le32_to_cpu(iagp->inofreefwd);
1093
1094 /* in preparation for removing the iag from the
1095 * ag inode free list, read the iags preceding
1096 * and following the iag on the ag inode free
1097 * list. before reading these iags, we must make
1098 * sure that we already don't have them in hand
1099 * from up above, since re-reading an iag (buffer)
1100 * we are currently holding would cause a deadlock.
1101 */
1102 if (inofreefwd >= 0) {
1103
1104 if (inofreefwd == fwd)
1105 ciagp = (struct iag *) amp->data;
1106 else if (inofreefwd == back)
1107 ciagp = (struct iag *) bmp->data;
1108 else {
1109 if ((rc =
1110 diIAGRead(imap, inofreefwd, &cmp)))
1111 goto error_out;
1112 ciagp = (struct iag *) cmp->data;
1113 }
1114 assert(ciagp != NULL);
1115 }
1116
1117 if (inofreeback >= 0) {
1118 if (inofreeback == fwd)
1119 diagp = (struct iag *) amp->data;
1120 else if (inofreeback == back)
1121 diagp = (struct iag *) bmp->data;
1122 else {
1123 if ((rc =
1124 diIAGRead(imap, inofreeback, &dmp)))
1125 goto error_out;
1126 diagp = (struct iag *) dmp->data;
1127 }
1128 assert(diagp != NULL);
1129 }
1130 }
1131
1132 IREAD_UNLOCK(ipimap);
1133
1134 /*
1135 * invalidate any page of the inode extent freed from buffer cache;
1136 */
1137 freepxd = iagp->inoext[extno];
1138 invalidate_pxd_metapages(ip, freepxd);
1139
1140 /*
1141 * update iag list(s) (careful update step 2)
1142 */
1143 /* add the iag to the ag extent free list if this is the
1144 * first free extent for the iag.
1145 */
1146 if (iagp->nfreeexts == 0) {
1147 if (fwd >= 0)
1148 aiagp->extfreeback = cpu_to_le32(iagno);
1149
1150 iagp->extfreefwd =
1151 cpu_to_le32(imap->im_agctl[agno].extfree);
1152 iagp->extfreeback = cpu_to_le32(-1);
1153 imap->im_agctl[agno].extfree = iagno;
1154 } else {
1155 /* remove the iag from the ag extent list if all extents
1156 * are now free and place it on the inode map iag free list.
1157 */
1158 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1159 if (fwd >= 0)
1160 aiagp->extfreeback = iagp->extfreeback;
1161
1162 if (back >= 0)
1163 biagp->extfreefwd = iagp->extfreefwd;
1164 else
1165 imap->im_agctl[agno].extfree =
1166 le32_to_cpu(iagp->extfreefwd);
1167
1168 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
1169
1170 IAGFREE_LOCK(imap);
1171 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1172 imap->im_freeiag = iagno;
1173 IAGFREE_UNLOCK(imap);
1174 }
1175 }
1176
1177 /* remove the iag from the ag inode free list if freeing
1178 * this extent causes the iag to have no free inodes.
1179 */
1180 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1181 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
1182 ciagp->inofreeback = iagp->inofreeback;
1183
1184 if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
1185 diagp->inofreefwd = iagp->inofreefwd;
1186 else
1187 imap->im_agctl[agno].inofree =
1188 le32_to_cpu(iagp->inofreefwd);
1189
1190 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
1191 }
1192
1193 /* update the inode extent address and working map
1194 * to reflect the free extent.
1195 * the permanent map should have been updated already
1196 * for the inode being freed.
1197 */
1198 if (iagp->pmap[extno] != 0) {
1199 jfs_error(ip->i_sb, "the pmap does not show inode free\n");
1200 }
1201 iagp->wmap[extno] = 0;
1202 PXDlength(&iagp->inoext[extno], 0);
1203 PXDaddress(&iagp->inoext[extno], 0);
1204
1205 /* update the free extent and free inode summary maps
1206 * to reflect the freed extent.
1207 * the inode summary map is marked to indicate no inodes
1208 * available for the freed extent.
1209 */
1210 sword = extno >> L2EXTSPERSUM;
1211 bitno = extno & (EXTSPERSUM - 1);
1212 mask = HIGHORDER >> bitno;
1213 iagp->inosmap[sword] |= cpu_to_le32(mask);
1214 iagp->extsmap[sword] &= cpu_to_le32(~mask);
1215
1216 /* update the number of free inodes and number of free extents
1217 * for the iag.
1218 */
1219 le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1));
1220 le32_add_cpu(&iagp->nfreeexts, 1);
1221
1222 /* update the number of free inodes and backed inodes
1223 * at the ag and inode map level.
1224 */
1225 imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
1226 imap->im_agctl[agno].numinos -= INOSPEREXT;
1227 atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
1228 atomic_sub(INOSPEREXT, &imap->im_numinos);
1229
1230 if (amp)
1231 write_metapage(amp);
1232 if (bmp)
1233 write_metapage(bmp);
1234 if (cmp)
1235 write_metapage(cmp);
1236 if (dmp)
1237 write_metapage(dmp);
1238
1239 /*
1240 * start transaction to update block allocation map
1241 * for the inode extent freed;
1242 *
1243 * N.B. AG_LOCK is released and iag will be released below, and
1244 * other thread may allocate inode from/reusing the ixad freed
1245 * BUT with new/different backing inode extent from the extent
1246 * to be freed by the transaction;
1247 */
1248 tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
1249 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
1250
1251 /* acquire tlock of the iag page of the freed ixad
1252 * to force the page NOHOMEOK (even though no data is
1253 * logged from the iag page) until NOREDOPAGE|FREEXTENT log
1254 * for the free of the extent is committed;
1255 * write FREEXTENT|NOREDOPAGE log record
1256 * N.B. linelock is overlaid as freed extent descriptor;
1257 */
1258 tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
1259 pxdlock = (struct pxd_lock *) & tlck->lock;
1260 pxdlock->flag = mlckFREEPXD;
1261 pxdlock->pxd = freepxd;
1262 pxdlock->index = 1;
1263
1264 write_metapage(mp);
1265
1266 iplist[0] = ipimap;
1267
1268 /*
1269 * logredo needs the IAG number and IAG extent index in order
1270 * to ensure that the IMap is consistent. The least disruptive
1271 * way to pass these values through to the transaction manager
1272 * is in the iplist array.
1273 *
1274 * It's not pretty, but it works.
1275 */
1276 iplist[1] = (struct inode *) (size_t)iagno;
1277 iplist[2] = (struct inode *) (size_t)extno;
1278
1279 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
1280
1281 txEnd(tid);
1282 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
1283
1284 /* unlock the AG inode map information */
1285 AG_UNLOCK(imap, agno);
1286
1287 return (0);
1288
1289 error_out:
1290 IREAD_UNLOCK(ipimap);
1291
1292 if (amp)
1293 release_metapage(amp);
1294 if (bmp)
1295 release_metapage(bmp);
1296 if (cmp)
1297 release_metapage(cmp);
1298 if (dmp)
1299 release_metapage(dmp);
1300
1301 AG_UNLOCK(imap, agno);
1302
1303 release_metapage(mp);
1304
1305 return (rc);
1306}
1307
1308/*
1309 * There are several places in the diAlloc* routines where we initialize
1310 * the inode.
1311 */
1312static inline void
1313diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
1314{
1315 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
1316
1317 ip->i_ino = (iagno << L2INOSPERIAG) + ino;
1318 jfs_ip->ixpxd = iagp->inoext[extno];
1319 jfs_ip->agstart = le64_to_cpu(iagp->agstart);
1320 jfs_ip->active_ag = -1;
1321}
1322
1323
1324/*
1325 * NAME: diAlloc(pip,dir,ip)
1326 *
1327 * FUNCTION: allocate a disk inode from the inode working map
1328 * for a fileset or aggregate.
1329 *
1330 * PARAMETERS:
1331 * pip - pointer to incore inode for the parent inode.
1332 * dir - 'true' if the new disk inode is for a directory.
1333 * ip - pointer to a new inode
1334 *
1335 * RETURN VALUES:
1336 * 0 - success.
1337 * -ENOSPC - insufficient disk resources.
1338 * -EIO - i/o error.
1339 */
1340int diAlloc(struct inode *pip, bool dir, struct inode *ip)
1341{
1342 int rc, ino, iagno, addext, extno, bitno, sword;
1343 int nwords, rem, i, agno;
1344 u32 mask, inosmap, extsmap;
1345 struct inode *ipimap;
1346 struct metapage *mp;
1347 ino_t inum;
1348 struct iag *iagp;
1349 struct inomap *imap;
1350
1351 /* get the pointers to the inode map inode and the
1352 * corresponding imap control structure.
1353 */
1354 ipimap = JFS_SBI(pip->i_sb)->ipimap;
1355 imap = JFS_IP(ipimap)->i_imap;
1356 JFS_IP(ip)->ipimap = ipimap;
1357 JFS_IP(ip)->fileset = FILESYSTEM_I;
1358
1359 /* for a directory, the allocation policy is to start
1360 * at the ag level using the preferred ag.
1361 */
1362 if (dir) {
1363 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1364 AG_LOCK(imap, agno);
1365 goto tryag;
1366 }
1367
1368 /* for files, the policy starts off by trying to allocate from
1369 * the same iag containing the parent disk inode:
1370 * try to allocate the new disk inode close to the parent disk
1371 * inode, using parent disk inode number + 1 as the allocation
1372 * hint. (we use a left-to-right policy to attempt to avoid
1373 * moving backward on the disk.) compute the hint within the
1374 * file system and the iag.
1375 */
1376
1377 /* get the ag number of this iag */
1378 agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
1379
1380 if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
1381 /*
1382 * There is an open file actively growing. We want to
1383 * allocate new inodes from a different ag to avoid
1384 * fragmentation problems.
1385 */
1386 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1387 AG_LOCK(imap, agno);
1388 goto tryag;
1389 }
1390
1391 inum = pip->i_ino + 1;
1392 ino = inum & (INOSPERIAG - 1);
1393
1394 /* back off the hint if it is outside of the iag */
1395 if (ino == 0)
1396 inum = pip->i_ino;
1397
1398 /* lock the AG inode map information */
1399 AG_LOCK(imap, agno);
1400
1401 /* Get read lock on imap inode */
1402 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
1403
1404 /* get the iag number and read the iag */
1405 iagno = INOTOIAG(inum);
1406 if ((rc = diIAGRead(imap, iagno, &mp))) {
1407 IREAD_UNLOCK(ipimap);
1408 AG_UNLOCK(imap, agno);
1409 return (rc);
1410 }
1411 iagp = (struct iag *) mp->data;
1412
1413 /* determine if new inode extent is allowed to be added to the iag.
1414 * new inode extent can be added to the iag if the ag
1415 * has less than 32 free disk inodes and the iag has free extents.
1416 */
1417 addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
1418
1419 /*
1420 * try to allocate from the IAG
1421 */
1422 /* check if the inode may be allocated from the iag
1423 * (i.e. the inode has free inodes or new extent can be added).
1424 */
1425 if (iagp->nfreeinos || addext) {
1426 /* determine the extent number of the hint.
1427 */
1428 extno = ino >> L2INOSPEREXT;
1429
1430 /* check if the extent containing the hint has backed
1431 * inodes. if so, try to allocate within this extent.
1432 */
1433 if (addressPXD(&iagp->inoext[extno])) {
1434 bitno = ino & (INOSPEREXT - 1);
1435 if ((bitno =
1436 diFindFree(le32_to_cpu(iagp->wmap[extno]),
1437 bitno))
1438 < INOSPEREXT) {
1439 ino = (extno << L2INOSPEREXT) + bitno;
1440
1441 /* a free inode (bit) was found within this
1442 * extent, so allocate it.
1443 */
1444 rc = diAllocBit(imap, iagp, ino);
1445 IREAD_UNLOCK(ipimap);
1446 if (rc) {
1447 assert(rc == -EIO);
1448 } else {
1449 /* set the results of the allocation
1450 * and write the iag.
1451 */
1452 diInitInode(ip, iagno, ino, extno,
1453 iagp);
1454 mark_metapage_dirty(mp);
1455 }
1456 release_metapage(mp);
1457
1458 /* free the AG lock and return.
1459 */
1460 AG_UNLOCK(imap, agno);
1461 return (rc);
1462 }
1463
1464 if (!addext)
1465 extno =
1466 (extno ==
1467 EXTSPERIAG - 1) ? 0 : extno + 1;
1468 }
1469
1470 /*
1471 * no free inodes within the extent containing the hint.
1472 *
1473 * try to allocate from the backed extents following
1474 * hint or, if appropriate (i.e. addext is true), allocate
1475 * an extent of free inodes at or following the extent
1476 * containing the hint.
1477 *
1478 * the free inode and free extent summary maps are used
1479 * here, so determine the starting summary map position
1480 * and the number of words we'll have to examine. again,
1481 * the approach is to allocate following the hint, so we
1482 * might have to initially ignore prior bits of the summary
1483 * map that represent extents prior to the extent containing
1484 * the hint and later revisit these bits.
1485 */
1486 bitno = extno & (EXTSPERSUM - 1);
1487 nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
1488 sword = extno >> L2EXTSPERSUM;
1489
1490 /* mask any prior bits for the starting words of the
1491 * summary map.
1492 */
1493 mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno));
1494 inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
1495 extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
1496
1497 /* scan the free inode and free extent summary maps for
1498 * free resources.
1499 */
1500 for (i = 0; i < nwords; i++) {
1501 /* check if this word of the free inode summary
1502 * map describes an extent with free inodes.
1503 */
1504 if (~inosmap) {
1505 /* an extent with free inodes has been
1506 * found. determine the extent number
1507 * and the inode number within the extent.
1508 */
1509 rem = diFindFree(inosmap, 0);
1510 extno = (sword << L2EXTSPERSUM) + rem;
1511 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
1512 0);
1513 if (rem >= INOSPEREXT) {
1514 IREAD_UNLOCK(ipimap);
1515 release_metapage(mp);
1516 AG_UNLOCK(imap, agno);
1517 jfs_error(ip->i_sb,
1518 "can't find free bit in wmap\n");
1519 return -EIO;
1520 }
1521
1522 /* determine the inode number within the
1523 * iag and allocate the inode from the
1524 * map.
1525 */
1526 ino = (extno << L2INOSPEREXT) + rem;
1527 rc = diAllocBit(imap, iagp, ino);
1528 IREAD_UNLOCK(ipimap);
1529 if (rc)
1530 assert(rc == -EIO);
1531 else {
1532 /* set the results of the allocation
1533 * and write the iag.
1534 */
1535 diInitInode(ip, iagno, ino, extno,
1536 iagp);
1537 mark_metapage_dirty(mp);
1538 }
1539 release_metapage(mp);
1540
1541 /* free the AG lock and return.
1542 */
1543 AG_UNLOCK(imap, agno);
1544 return (rc);
1545
1546 }
1547
1548 /* check if we may allocate an extent of free
1549 * inodes and whether this word of the free
1550 * extents summary map describes a free extent.
1551 */
1552 if (addext && ~extsmap) {
1553 /* a free extent has been found. determine
1554 * the extent number.
1555 */
1556 rem = diFindFree(extsmap, 0);
1557 extno = (sword << L2EXTSPERSUM) + rem;
1558
1559 /* allocate an extent of free inodes.
1560 */
1561 if ((rc = diNewExt(imap, iagp, extno))) {
1562 /* if there is no disk space for a
1563 * new extent, try to allocate the
1564 * disk inode from somewhere else.
1565 */
1566 if (rc == -ENOSPC)
1567 break;
1568
1569 assert(rc == -EIO);
1570 } else {
1571 /* set the results of the allocation
1572 * and write the iag.
1573 */
1574 diInitInode(ip, iagno,
1575 extno << L2INOSPEREXT,
1576 extno, iagp);
1577 mark_metapage_dirty(mp);
1578 }
1579 release_metapage(mp);
1580 /* free the imap inode & the AG lock & return.
1581 */
1582 IREAD_UNLOCK(ipimap);
1583 AG_UNLOCK(imap, agno);
1584 return (rc);
1585 }
1586
1587 /* move on to the next set of summary map words.
1588 */
1589 sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
1590 inosmap = le32_to_cpu(iagp->inosmap[sword]);
1591 extsmap = le32_to_cpu(iagp->extsmap[sword]);
1592 }
1593 }
1594 /* unlock imap inode */
1595 IREAD_UNLOCK(ipimap);
1596
1597 /* nothing doing in this iag, so release it. */
1598 release_metapage(mp);
1599
1600 tryag:
1601 /*
1602 * try to allocate anywhere within the same AG as the parent inode.
1603 */
1604 rc = diAllocAG(imap, agno, dir, ip);
1605
1606 AG_UNLOCK(imap, agno);
1607
1608 if (rc != -ENOSPC)
1609 return (rc);
1610
1611 /*
1612 * try to allocate in any AG.
1613 */
1614 return (diAllocAny(imap, agno, dir, ip));
1615}
1616
1617
1618/*
1619 * NAME: diAllocAG(imap,agno,dir,ip)
1620 *
1621 * FUNCTION: allocate a disk inode from the allocation group.
1622 *
1623 * this routine first determines if a new extent of free
1624 * inodes should be added for the allocation group, with
1625 * the current request satisfied from this extent. if this
1626 * is the case, an attempt will be made to do just that. if
1627 * this attempt fails or it has been determined that a new
1628 * extent should not be added, an attempt is made to satisfy
1629 * the request by allocating an existing (backed) free inode
1630 * from the allocation group.
1631 *
1632 * PRE CONDITION: Already have the AG lock for this AG.
1633 *
1634 * PARAMETERS:
1635 * imap - pointer to inode map control structure.
1636 * agno - allocation group to allocate from.
1637 * dir - 'true' if the new disk inode is for a directory.
1638 * ip - pointer to the new inode to be filled in on successful return
1639 * with the disk inode number allocated, its extent address
1640 * and the start of the ag.
1641 *
1642 * RETURN VALUES:
1643 * 0 - success.
1644 * -ENOSPC - insufficient disk resources.
1645 * -EIO - i/o error.
1646 */
1647static int
1648diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
1649{
1650 int rc, addext, numfree, numinos;
1651
1652 /* get the number of free and the number of backed disk
1653 * inodes currently within the ag.
1654 */
1655 numfree = imap->im_agctl[agno].numfree;
1656 numinos = imap->im_agctl[agno].numinos;
1657
1658 if (numfree > numinos) {
1659 jfs_error(ip->i_sb, "numfree > numinos\n");
1660 return -EIO;
1661 }
1662
1663 /* determine if we should allocate a new extent of free inodes
1664 * within the ag: for directory inodes, add a new extent
1665 * if there are a small number of free inodes or number of free
1666 * inodes is a small percentage of the number of backed inodes.
1667 */
1668 if (dir)
1669 addext = (numfree < 64 ||
1670 (numfree < 256
1671 && ((numfree * 100) / numinos) <= 20));
1672 else
1673 addext = (numfree == 0);
1674
1675 /*
1676 * try to allocate a new extent of free inodes.
1677 */
1678 if (addext) {
1679 /* if free space is not available for this new extent, try
1680 * below to allocate a free and existing (already backed)
1681 * inode from the ag.
1682 */
1683 if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
1684 return (rc);
1685 }
1686
1687 /*
1688 * try to allocate an existing free inode from the ag.
1689 */
1690 return (diAllocIno(imap, agno, ip));
1691}
1692
1693
1694/*
1695 * NAME: diAllocAny(imap,agno,dir,iap)
1696 *
1697 * FUNCTION: allocate a disk inode from any other allocation group.
1698 *
1699 * this routine is called when an allocation attempt within
1700 * the primary allocation group has failed. if attempts to
1701 * allocate an inode from any allocation group other than the
1702 * specified primary group.
1703 *
1704 * PARAMETERS:
1705 * imap - pointer to inode map control structure.
1706 * agno - primary allocation group (to avoid).
1707 * dir - 'true' if the new disk inode is for a directory.
1708 * ip - pointer to a new inode to be filled in on successful return
1709 * with the disk inode number allocated, its extent address
1710 * and the start of the ag.
1711 *
1712 * RETURN VALUES:
1713 * 0 - success.
1714 * -ENOSPC - insufficient disk resources.
1715 * -EIO - i/o error.
1716 */
1717static int
1718diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
1719{
1720 int ag, rc;
1721 int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;
1722
1723
1724 /* try to allocate from the ags following agno up to
1725 * the maximum ag number.
1726 */
1727 for (ag = agno + 1; ag <= maxag; ag++) {
1728 AG_LOCK(imap, ag);
1729
1730 rc = diAllocAG(imap, ag, dir, ip);
1731
1732 AG_UNLOCK(imap, ag);
1733
1734 if (rc != -ENOSPC)
1735 return (rc);
1736 }
1737
1738 /* try to allocate from the ags in front of agno.
1739 */
1740 for (ag = 0; ag < agno; ag++) {
1741 AG_LOCK(imap, ag);
1742
1743 rc = diAllocAG(imap, ag, dir, ip);
1744
1745 AG_UNLOCK(imap, ag);
1746
1747 if (rc != -ENOSPC)
1748 return (rc);
1749 }
1750
1751 /* no free disk inodes.
1752 */
1753 return -ENOSPC;
1754}
1755
1756
1757/*
1758 * NAME: diAllocIno(imap,agno,ip)
1759 *
1760 * FUNCTION: allocate a disk inode from the allocation group's free
1761 * inode list, returning an error if this free list is
1762 * empty (i.e. no iags on the list).
1763 *
1764 * allocation occurs from the first iag on the list using
1765 * the iag's free inode summary map to find the leftmost
1766 * free inode in the iag.
1767 *
1768 * PRE CONDITION: Already have AG lock for this AG.
1769 *
1770 * PARAMETERS:
1771 * imap - pointer to inode map control structure.
1772 * agno - allocation group.
1773 * ip - pointer to new inode to be filled in on successful return
1774 * with the disk inode number allocated, its extent address
1775 * and the start of the ag.
1776 *
1777 * RETURN VALUES:
1778 * 0 - success.
1779 * -ENOSPC - insufficient disk resources.
1780 * -EIO - i/o error.
1781 */
1782static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
1783{
1784 int iagno, ino, rc, rem, extno, sword;
1785 struct metapage *mp;
1786 struct iag *iagp;
1787
1788 /* check if there are iags on the ag's free inode list.
1789 */
1790 if ((iagno = imap->im_agctl[agno].inofree) < 0)
1791 return -ENOSPC;
1792
1793 /* obtain read lock on imap inode */
1794 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1795
1796 /* read the iag at the head of the list.
1797 */
1798 if ((rc = diIAGRead(imap, iagno, &mp))) {
1799 IREAD_UNLOCK(imap->im_ipimap);
1800 return (rc);
1801 }
1802 iagp = (struct iag *) mp->data;
1803
1804 /* better be free inodes in this iag if it is on the
1805 * list.
1806 */
1807 if (!iagp->nfreeinos) {
1808 IREAD_UNLOCK(imap->im_ipimap);
1809 release_metapage(mp);
1810 jfs_error(ip->i_sb, "nfreeinos = 0, but iag on freelist\n");
1811 return -EIO;
1812 }
1813
1814 /* scan the free inode summary map to find an extent
1815 * with free inodes.
1816 */
1817 for (sword = 0;; sword++) {
1818 if (sword >= SMAPSZ) {
1819 IREAD_UNLOCK(imap->im_ipimap);
1820 release_metapage(mp);
1821 jfs_error(ip->i_sb,
1822 "free inode not found in summary map\n");
1823 return -EIO;
1824 }
1825
1826 if (~iagp->inosmap[sword])
1827 break;
1828 }
1829
1830 /* found a extent with free inodes. determine
1831 * the extent number.
1832 */
1833 rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
1834 if (rem >= EXTSPERSUM) {
1835 IREAD_UNLOCK(imap->im_ipimap);
1836 release_metapage(mp);
1837 jfs_error(ip->i_sb, "no free extent found\n");
1838 return -EIO;
1839 }
1840 extno = (sword << L2EXTSPERSUM) + rem;
1841
1842 /* find the first free inode in the extent.
1843 */
1844 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
1845 if (rem >= INOSPEREXT) {
1846 IREAD_UNLOCK(imap->im_ipimap);
1847 release_metapage(mp);
1848 jfs_error(ip->i_sb, "free inode not found\n");
1849 return -EIO;
1850 }
1851
1852 /* compute the inode number within the iag.
1853 */
1854 ino = (extno << L2INOSPEREXT) + rem;
1855
1856 /* allocate the inode.
1857 */
1858 rc = diAllocBit(imap, iagp, ino);
1859 IREAD_UNLOCK(imap->im_ipimap);
1860 if (rc) {
1861 release_metapage(mp);
1862 return (rc);
1863 }
1864
1865 /* set the results of the allocation and write the iag.
1866 */
1867 diInitInode(ip, iagno, ino, extno, iagp);
1868 write_metapage(mp);
1869
1870 return (0);
1871}
1872
1873
1874/*
1875 * NAME: diAllocExt(imap,agno,ip)
1876 *
1877 * FUNCTION: add a new extent of free inodes to an iag, allocating
1878 * an inode from this extent to satisfy the current allocation
1879 * request.
1880 *
1881 * this routine first tries to find an existing iag with free
1882 * extents through the ag free extent list. if list is not
1883 * empty, the head of the list will be selected as the home
1884 * of the new extent of free inodes. otherwise (the list is
1885 * empty), a new iag will be allocated for the ag to contain
1886 * the extent.
1887 *
1888 * once an iag has been selected, the free extent summary map
1889 * is used to locate a free extent within the iag and diNewExt()
1890 * is called to initialize the extent, with initialization
1891 * including the allocation of the first inode of the extent
1892 * for the purpose of satisfying this request.
1893 *
1894 * PARAMETERS:
1895 * imap - pointer to inode map control structure.
1896 * agno - allocation group number.
1897 * ip - pointer to new inode to be filled in on successful return
1898 * with the disk inode number allocated, its extent address
1899 * and the start of the ag.
1900 *
1901 * RETURN VALUES:
1902 * 0 - success.
1903 * -ENOSPC - insufficient disk resources.
1904 * -EIO - i/o error.
1905 */
1906static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
1907{
1908 int rem, iagno, sword, extno, rc;
1909 struct metapage *mp;
1910 struct iag *iagp;
1911
1912 /* check if the ag has any iags with free extents. if not,
1913 * allocate a new iag for the ag.
1914 */
1915 if ((iagno = imap->im_agctl[agno].extfree) < 0) {
1916 /* If successful, diNewIAG will obtain the read lock on the
1917 * imap inode.
1918 */
1919 if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
1920 return (rc);
1921 }
1922 iagp = (struct iag *) mp->data;
1923
1924 /* set the ag number if this a brand new iag
1925 */
1926 iagp->agstart =
1927 cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
1928 } else {
1929 /* read the iag.
1930 */
1931 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1932 if ((rc = diIAGRead(imap, iagno, &mp))) {
1933 IREAD_UNLOCK(imap->im_ipimap);
1934 jfs_error(ip->i_sb, "error reading iag\n");
1935 return rc;
1936 }
1937 iagp = (struct iag *) mp->data;
1938 }
1939
1940 /* using the free extent summary map, find a free extent.
1941 */
1942 for (sword = 0;; sword++) {
1943 if (sword >= SMAPSZ) {
1944 release_metapage(mp);
1945 IREAD_UNLOCK(imap->im_ipimap);
1946 jfs_error(ip->i_sb, "free ext summary map not found\n");
1947 return -EIO;
1948 }
1949 if (~iagp->extsmap[sword])
1950 break;
1951 }
1952
1953 /* determine the extent number of the free extent.
1954 */
1955 rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
1956 if (rem >= EXTSPERSUM) {
1957 release_metapage(mp);
1958 IREAD_UNLOCK(imap->im_ipimap);
1959 jfs_error(ip->i_sb, "free extent not found\n");
1960 return -EIO;
1961 }
1962 extno = (sword << L2EXTSPERSUM) + rem;
1963
1964 /* initialize the new extent.
1965 */
1966 rc = diNewExt(imap, iagp, extno);
1967 IREAD_UNLOCK(imap->im_ipimap);
1968 if (rc) {
1969 /* something bad happened. if a new iag was allocated,
1970 * place it back on the inode map's iag free list, and
1971 * clear the ag number information.
1972 */
1973 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
1974 IAGFREE_LOCK(imap);
1975 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1976 imap->im_freeiag = iagno;
1977 IAGFREE_UNLOCK(imap);
1978 }
1979 write_metapage(mp);
1980 return (rc);
1981 }
1982
1983 /* set the results of the allocation and write the iag.
1984 */
1985 diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp);
1986
1987 write_metapage(mp);
1988
1989 return (0);
1990}
1991
1992
1993/*
1994 * NAME: diAllocBit(imap,iagp,ino)
1995 *
1996 * FUNCTION: allocate a backed inode from an iag.
1997 *
1998 * this routine performs the mechanics of allocating a
1999 * specified inode from a backed extent.
2000 *
2001 * if the inode to be allocated represents the last free
2002 * inode within the iag, the iag will be removed from the
2003 * ag free inode list.
2004 *
2005 * a careful update approach is used to provide consistency
2006 * in the face of updates to multiple buffers. under this
2007 * approach, all required buffers are obtained before making
2008 * any updates and are held all are updates are complete.
2009 *
2010 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2011 * this AG. Must have read lock on imap inode.
2012 *
2013 * PARAMETERS:
2014 * imap - pointer to inode map control structure.
2015 * iagp - pointer to iag.
2016 * ino - inode number to be allocated within the iag.
2017 *
2018 * RETURN VALUES:
2019 * 0 - success.
2020 * -ENOSPC - insufficient disk resources.
2021 * -EIO - i/o error.
2022 */
2023static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
2024{
2025 int extno, bitno, agno, sword, rc;
2026 struct metapage *amp = NULL, *bmp = NULL;
2027 struct iag *aiagp = NULL, *biagp = NULL;
2028 u32 mask;
2029
2030 /* check if this is the last free inode within the iag.
2031 * if so, it will have to be removed from the ag free
2032 * inode list, so get the iags preceding and following
2033 * it on the list.
2034 */
2035 if (iagp->nfreeinos == cpu_to_le32(1)) {
2036 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
2037 if ((rc =
2038 diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
2039 &)))
2040 return (rc);
2041 aiagp = (struct iag *) amp->data;
2042 }
2043
2044 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
2045 if ((rc =
2046 diIAGRead(imap,
2047 le32_to_cpu(iagp->inofreeback),
2048 &bmp))) {
2049 if (amp)
2050 release_metapage(amp);
2051 return (rc);
2052 }
2053 biagp = (struct iag *) bmp->data;
2054 }
2055 }
2056
2057 /* get the ag number, extent number, inode number within
2058 * the extent.
2059 */
2060 agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
2061 extno = ino >> L2INOSPEREXT;
2062 bitno = ino & (INOSPEREXT - 1);
2063
2064 /* compute the mask for setting the map.
2065 */
2066 mask = HIGHORDER >> bitno;
2067
2068 /* the inode should be free and backed.
2069 */
2070 if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
2071 ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
2072 (addressPXD(&iagp->inoext[extno]) == 0)) {
2073 if (amp)
2074 release_metapage(amp);
2075 if (bmp)
2076 release_metapage(bmp);
2077
2078 jfs_error(imap->im_ipimap->i_sb, "iag inconsistent\n");
2079 return -EIO;
2080 }
2081
2082 /* mark the inode as allocated in the working map.
2083 */
2084 iagp->wmap[extno] |= cpu_to_le32(mask);
2085
2086 /* check if all inodes within the extent are now
2087 * allocated. if so, update the free inode summary
2088 * map to reflect this.
2089 */
2090 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
2091 sword = extno >> L2EXTSPERSUM;
2092 bitno = extno & (EXTSPERSUM - 1);
2093 iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
2094 }
2095
2096 /* if this was the last free inode in the iag, remove the
2097 * iag from the ag free inode list.
2098 */
2099 if (iagp->nfreeinos == cpu_to_le32(1)) {
2100 if (amp) {
2101 aiagp->inofreeback = iagp->inofreeback;
2102 write_metapage(amp);
2103 }
2104
2105 if (bmp) {
2106 biagp->inofreefwd = iagp->inofreefwd;
2107 write_metapage(bmp);
2108 } else {
2109 imap->im_agctl[agno].inofree =
2110 le32_to_cpu(iagp->inofreefwd);
2111 }
2112 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2113 }
2114
2115 /* update the free inode count at the iag, ag, inode
2116 * map levels.
2117 */
2118 le32_add_cpu(&iagp->nfreeinos, -1);
2119 imap->im_agctl[agno].numfree -= 1;
2120 atomic_dec(&imap->im_numfree);
2121
2122 return (0);
2123}
2124
2125
2126/*
2127 * NAME: diNewExt(imap,iagp,extno)
2128 *
2129 * FUNCTION: initialize a new extent of inodes for an iag, allocating
2130 * the first inode of the extent for use for the current
2131 * allocation request.
2132 *
2133 * disk resources are allocated for the new extent of inodes
2134 * and the inodes themselves are initialized to reflect their
2135 * existence within the extent (i.e. their inode numbers and
2136 * inode extent addresses are set) and their initial state
2137 * (mode and link count are set to zero).
2138 *
2139 * if the iag is new, it is not yet on an ag extent free list
2140 * but will now be placed on this list.
2141 *
2142 * if the allocation of the new extent causes the iag to
2143 * have no free extent, the iag will be removed from the
2144 * ag extent free list.
2145 *
2146 * if the iag has no free backed inodes, it will be placed
2147 * on the ag free inode list, since the addition of the new
2148 * extent will now cause it to have free inodes.
2149 *
2150 * a careful update approach is used to provide consistency
2151 * (i.e. list consistency) in the face of updates to multiple
2152 * buffers. under this approach, all required buffers are
2153 * obtained before making any updates and are held until all
2154 * updates are complete.
2155 *
2156 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2157 * this AG. Must have read lock on imap inode.
2158 *
2159 * PARAMETERS:
2160 * imap - pointer to inode map control structure.
2161 * iagp - pointer to iag.
2162 * extno - extent number.
2163 *
2164 * RETURN VALUES:
2165 * 0 - success.
2166 * -ENOSPC - insufficient disk resources.
2167 * -EIO - i/o error.
2168 */
2169static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
2170{
2171 int agno, iagno, fwd, back, freei = 0, sword, rc;
2172 struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
2173 struct metapage *amp, *bmp, *cmp, *dmp;
2174 struct inode *ipimap;
2175 s64 blkno, hint;
2176 int i, j;
2177 u32 mask;
2178 ino_t ino;
2179 struct dinode *dp;
2180 struct jfs_sb_info *sbi;
2181
2182 /* better have free extents.
2183 */
2184 if (!iagp->nfreeexts) {
2185 jfs_error(imap->im_ipimap->i_sb, "no free extents\n");
2186 return -EIO;
2187 }
2188
2189 /* get the inode map inode.
2190 */
2191 ipimap = imap->im_ipimap;
2192 sbi = JFS_SBI(ipimap->i_sb);
2193
2194 amp = bmp = cmp = NULL;
2195
2196 /* get the ag and iag numbers for this iag.
2197 */
2198 agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
2199 iagno = le32_to_cpu(iagp->iagnum);
2200
2201 /* check if this is the last free extent within the
2202 * iag. if so, the iag must be removed from the ag
2203 * free extent list, so get the iags preceding and
2204 * following the iag on this list.
2205 */
2206 if (iagp->nfreeexts == cpu_to_le32(1)) {
2207 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
2208 if ((rc = diIAGRead(imap, fwd, &)))
2209 return (rc);
2210 aiagp = (struct iag *) amp->data;
2211 }
2212
2213 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
2214 if ((rc = diIAGRead(imap, back, &bmp)))
2215 goto error_out;
2216 biagp = (struct iag *) bmp->data;
2217 }
2218 } else {
2219 /* the iag has free extents. if all extents are free
2220 * (as is the case for a newly allocated iag), the iag
2221 * must be added to the ag free extent list, so get
2222 * the iag at the head of the list in preparation for
2223 * adding this iag to this list.
2224 */
2225 fwd = back = -1;
2226 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2227 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
2228 if ((rc = diIAGRead(imap, fwd, &)))
2229 goto error_out;
2230 aiagp = (struct iag *) amp->data;
2231 }
2232 }
2233 }
2234
2235 /* check if the iag has no free inodes. if so, the iag
2236 * will have to be added to the ag free inode list, so get
2237 * the iag at the head of the list in preparation for
2238 * adding this iag to this list. in doing this, we must
2239 * check if we already have the iag at the head of
2240 * the list in hand.
2241 */
2242 if (iagp->nfreeinos == 0) {
2243 freei = imap->im_agctl[agno].inofree;
2244
2245 if (freei >= 0) {
2246 if (freei == fwd) {
2247 ciagp = aiagp;
2248 } else if (freei == back) {
2249 ciagp = biagp;
2250 } else {
2251 if ((rc = diIAGRead(imap, freei, &cmp)))
2252 goto error_out;
2253 ciagp = (struct iag *) cmp->data;
2254 }
2255 if (ciagp == NULL) {
2256 jfs_error(imap->im_ipimap->i_sb,
2257 "ciagp == NULL\n");
2258 rc = -EIO;
2259 goto error_out;
2260 }
2261 }
2262 }
2263
2264 /* allocate disk space for the inode extent.
2265 */
2266 if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0))
2267 hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
2268 else
2269 hint = addressPXD(&iagp->inoext[extno - 1]) +
2270 lengthPXD(&iagp->inoext[extno - 1]) - 1;
2271
2272 if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno)))
2273 goto error_out;
2274
2275 /* compute the inode number of the first inode within the
2276 * extent.
2277 */
2278 ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
2279
2280 /* initialize the inodes within the newly allocated extent a
2281 * page at a time.
2282 */
2283 for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
2284 /* get a buffer for this page of disk inodes.
2285 */
2286 dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
2287 if (dmp == NULL) {
2288 rc = -EIO;
2289 goto error_out;
2290 }
2291 dp = (struct dinode *) dmp->data;
2292
2293 /* initialize the inode number, mode, link count and
2294 * inode extent address.
2295 */
2296 for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
2297 dp->di_inostamp = cpu_to_le32(sbi->inostamp);
2298 dp->di_number = cpu_to_le32(ino);
2299 dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
2300 dp->di_mode = 0;
2301 dp->di_nlink = 0;
2302 PXDaddress(&(dp->di_ixpxd), blkno);
2303 PXDlength(&(dp->di_ixpxd), imap->im_nbperiext);
2304 }
2305 write_metapage(dmp);
2306 }
2307
2308 /* if this is the last free extent within the iag, remove the
2309 * iag from the ag free extent list.
2310 */
2311 if (iagp->nfreeexts == cpu_to_le32(1)) {
2312 if (fwd >= 0)
2313 aiagp->extfreeback = iagp->extfreeback;
2314
2315 if (back >= 0)
2316 biagp->extfreefwd = iagp->extfreefwd;
2317 else
2318 imap->im_agctl[agno].extfree =
2319 le32_to_cpu(iagp->extfreefwd);
2320
2321 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2322 } else {
2323 /* if the iag has all free extents (newly allocated iag),
2324 * add the iag to the ag free extent list.
2325 */
2326 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2327 if (fwd >= 0)
2328 aiagp->extfreeback = cpu_to_le32(iagno);
2329
2330 iagp->extfreefwd = cpu_to_le32(fwd);
2331 iagp->extfreeback = cpu_to_le32(-1);
2332 imap->im_agctl[agno].extfree = iagno;
2333 }
2334 }
2335
2336 /* if the iag has no free inodes, add the iag to the
2337 * ag free inode list.
2338 */
2339 if (iagp->nfreeinos == 0) {
2340 if (freei >= 0)
2341 ciagp->inofreeback = cpu_to_le32(iagno);
2342
2343 iagp->inofreefwd =
2344 cpu_to_le32(imap->im_agctl[agno].inofree);
2345 iagp->inofreeback = cpu_to_le32(-1);
2346 imap->im_agctl[agno].inofree = iagno;
2347 }
2348
2349 /* initialize the extent descriptor of the extent. */
2350 PXDlength(&iagp->inoext[extno], imap->im_nbperiext);
2351 PXDaddress(&iagp->inoext[extno], blkno);
2352
2353 /* initialize the working and persistent map of the extent.
2354 * the working map will be initialized such that
2355 * it indicates the first inode of the extent is allocated.
2356 */
2357 iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
2358 iagp->pmap[extno] = 0;
2359
2360 /* update the free inode and free extent summary maps
2361 * for the extent to indicate the extent has free inodes
2362 * and no longer represents a free extent.
2363 */
2364 sword = extno >> L2EXTSPERSUM;
2365 mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
2366 iagp->extsmap[sword] |= cpu_to_le32(mask);
2367 iagp->inosmap[sword] &= cpu_to_le32(~mask);
2368
2369 /* update the free inode and free extent counts for the
2370 * iag.
2371 */
2372 le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1));
2373 le32_add_cpu(&iagp->nfreeexts, -1);
2374
2375 /* update the free and backed inode counts for the ag.
2376 */
2377 imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
2378 imap->im_agctl[agno].numinos += INOSPEREXT;
2379
2380 /* update the free and backed inode counts for the inode map.
2381 */
2382 atomic_add(INOSPEREXT - 1, &imap->im_numfree);
2383 atomic_add(INOSPEREXT, &imap->im_numinos);
2384
2385 /* write the iags.
2386 */
2387 if (amp)
2388 write_metapage(amp);
2389 if (bmp)
2390 write_metapage(bmp);
2391 if (cmp)
2392 write_metapage(cmp);
2393
2394 return (0);
2395
2396 error_out:
2397
2398 /* release the iags.
2399 */
2400 if (amp)
2401 release_metapage(amp);
2402 if (bmp)
2403 release_metapage(bmp);
2404 if (cmp)
2405 release_metapage(cmp);
2406
2407 return (rc);
2408}
2409
2410
2411/*
2412 * NAME: diNewIAG(imap,iagnop,agno)
2413 *
2414 * FUNCTION: allocate a new iag for an allocation group.
2415 *
2416 * first tries to allocate the iag from the inode map
2417 * iagfree list:
2418 * if the list has free iags, the head of the list is removed
2419 * and returned to satisfy the request.
2420 * if the inode map's iag free list is empty, the inode map
2421 * is extended to hold a new iag. this new iag is initialized
2422 * and returned to satisfy the request.
2423 *
2424 * PARAMETERS:
2425 * imap - pointer to inode map control structure.
2426 * iagnop - pointer to an iag number set with the number of the
2427 * newly allocated iag upon successful return.
2428 * agno - allocation group number.
2429 * bpp - Buffer pointer to be filled in with new IAG's buffer
2430 *
2431 * RETURN VALUES:
2432 * 0 - success.
2433 * -ENOSPC - insufficient disk resources.
2434 * -EIO - i/o error.
2435 *
2436 * serialization:
2437 * AG lock held on entry/exit;
2438 * write lock on the map is held inside;
2439 * read lock on the map is held on successful completion;
2440 *
2441 * note: new iag transaction:
2442 * . synchronously write iag;
2443 * . write log of xtree and inode of imap;
2444 * . commit;
2445 * . synchronous write of xtree (right to left, bottom to top);
2446 * . at start of logredo(): init in-memory imap with one additional iag page;
2447 * . at end of logredo(): re-read imap inode to determine
2448 * new imap size;
2449 */
2450static int
2451diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
2452{
2453 int rc;
2454 int iagno, i, xlen;
2455 struct inode *ipimap;
2456 struct super_block *sb;
2457 struct jfs_sb_info *sbi;
2458 struct metapage *mp;
2459 struct iag *iagp;
2460 s64 xaddr = 0;
2461 s64 blkno;
2462 tid_t tid;
2463 struct inode *iplist[1];
2464
2465 /* pick up pointers to the inode map and mount inodes */
2466 ipimap = imap->im_ipimap;
2467 sb = ipimap->i_sb;
2468 sbi = JFS_SBI(sb);
2469
2470 /* acquire the free iag lock */
2471 IAGFREE_LOCK(imap);
2472
2473 /* if there are any iags on the inode map free iag list,
2474 * allocate the iag from the head of the list.
2475 */
2476 if (imap->im_freeiag >= 0) {
2477 /* pick up the iag number at the head of the list */
2478 iagno = imap->im_freeiag;
2479
2480 /* determine the logical block number of the iag */
2481 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2482 } else {
2483 /* no free iags. the inode map will have to be extented
2484 * to include a new iag.
2485 */
2486
2487 /* acquire inode map lock */
2488 IWRITE_LOCK(ipimap, RDWRLOCK_IMAP);
2489
2490 if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
2491 IWRITE_UNLOCK(ipimap);
2492 IAGFREE_UNLOCK(imap);
2493 jfs_error(imap->im_ipimap->i_sb,
2494 "ipimap->i_size is wrong\n");
2495 return -EIO;
2496 }
2497
2498
2499 /* get the next available iag number */
2500 iagno = imap->im_nextiag;
2501
2502 /* make sure that we have not exceeded the maximum inode
2503 * number limit.
2504 */
2505 if (iagno > (MAXIAGS - 1)) {
2506 /* release the inode map lock */
2507 IWRITE_UNLOCK(ipimap);
2508
2509 rc = -ENOSPC;
2510 goto out;
2511 }
2512
2513 /*
2514 * synchronously append new iag page.
2515 */
2516 /* determine the logical address of iag page to append */
2517 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2518
2519 /* Allocate extent for new iag page */
2520 xlen = sbi->nbperpage;
2521 if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) {
2522 /* release the inode map lock */
2523 IWRITE_UNLOCK(ipimap);
2524
2525 goto out;
2526 }
2527
2528 /*
2529 * start transaction of update of the inode map
2530 * addressing structure pointing to the new iag page;
2531 */
2532 tid = txBegin(sb, COMMIT_FORCE);
2533 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
2534
2535 /* update the inode map addressing structure to point to it */
2536 if ((rc =
2537 xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) {
2538 txEnd(tid);
2539 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2540 /* Free the blocks allocated for the iag since it was
2541 * not successfully added to the inode map
2542 */
2543 dbFree(ipimap, xaddr, (s64) xlen);
2544
2545 /* release the inode map lock */
2546 IWRITE_UNLOCK(ipimap);
2547
2548 goto out;
2549 }
2550
2551 /* update the inode map's inode to reflect the extension */
2552 ipimap->i_size += PSIZE;
2553 inode_add_bytes(ipimap, PSIZE);
2554
2555 /* assign a buffer for the page */
2556 mp = get_metapage(ipimap, blkno, PSIZE, 0);
2557 if (!mp) {
2558 /*
2559 * This is very unlikely since we just created the
2560 * extent, but let's try to handle it correctly
2561 */
2562 xtTruncate(tid, ipimap, ipimap->i_size - PSIZE,
2563 COMMIT_PWMAP);
2564
2565 txAbort(tid, 0);
2566 txEnd(tid);
2567 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2568
2569 /* release the inode map lock */
2570 IWRITE_UNLOCK(ipimap);
2571
2572 rc = -EIO;
2573 goto out;
2574 }
2575 iagp = (struct iag *) mp->data;
2576
2577 /* init the iag */
2578 memset(iagp, 0, sizeof(struct iag));
2579 iagp->iagnum = cpu_to_le32(iagno);
2580 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2581 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2582 iagp->iagfree = cpu_to_le32(-1);
2583 iagp->nfreeinos = 0;
2584 iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
2585
2586 /* initialize the free inode summary map (free extent
2587 * summary map initialization handled by bzero).
2588 */
2589 for (i = 0; i < SMAPSZ; i++)
2590 iagp->inosmap[i] = cpu_to_le32(ONES);
2591
2592 /*
2593 * Write and sync the metapage
2594 */
2595 flush_metapage(mp);
2596
2597 /*
2598 * txCommit(COMMIT_FORCE) will synchronously write address
2599 * index pages and inode after commit in careful update order
2600 * of address index pages (right to left, bottom up);
2601 */
2602 iplist[0] = ipimap;
2603 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
2604
2605 txEnd(tid);
2606 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2607
2608 duplicateIXtree(sb, blkno, xlen, &xaddr);
2609
2610 /* update the next available iag number */
2611 imap->im_nextiag += 1;
2612
2613 /* Add the iag to the iag free list so we don't lose the iag
2614 * if a failure happens now.
2615 */
2616 imap->im_freeiag = iagno;
2617
2618 /* Until we have logredo working, we want the imap inode &
2619 * control page to be up to date.
2620 */
2621 diSync(ipimap);
2622
2623 /* release the inode map lock */
2624 IWRITE_UNLOCK(ipimap);
2625 }
2626
2627 /* obtain read lock on map */
2628 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2629
2630 /* read the iag */
2631 if ((rc = diIAGRead(imap, iagno, &mp))) {
2632 IREAD_UNLOCK(ipimap);
2633 rc = -EIO;
2634 goto out;
2635 }
2636 iagp = (struct iag *) mp->data;
2637
2638 /* remove the iag from the iag free list */
2639 imap->im_freeiag = le32_to_cpu(iagp->iagfree);
2640 iagp->iagfree = cpu_to_le32(-1);
2641
2642 /* set the return iag number and buffer pointer */
2643 *iagnop = iagno;
2644 *mpp = mp;
2645
2646 out:
2647 /* release the iag free lock */
2648 IAGFREE_UNLOCK(imap);
2649
2650 return (rc);
2651}
2652
2653/*
2654 * NAME: diIAGRead()
2655 *
2656 * FUNCTION: get the buffer for the specified iag within a fileset
2657 * or aggregate inode map.
2658 *
2659 * PARAMETERS:
2660 * imap - pointer to inode map control structure.
2661 * iagno - iag number.
2662 * bpp - point to buffer pointer to be filled in on successful
2663 * exit.
2664 *
2665 * SERIALIZATION:
2666 * must have read lock on imap inode
2667 * (When called by diExtendFS, the filesystem is quiesced, therefore
2668 * the read lock is unnecessary.)
2669 *
2670 * RETURN VALUES:
2671 * 0 - success.
2672 * -EIO - i/o error.
2673 */
2674static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
2675{
2676 struct inode *ipimap = imap->im_ipimap;
2677 s64 blkno;
2678
2679 /* compute the logical block number of the iag. */
2680 blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
2681
2682 /* read the iag. */
2683 *mpp = read_metapage(ipimap, blkno, PSIZE, 0);
2684 if (*mpp == NULL) {
2685 return -EIO;
2686 }
2687
2688 return (0);
2689}
2690
2691/*
2692 * NAME: diFindFree()
2693 *
2694 * FUNCTION: find the first free bit in a word starting at
2695 * the specified bit position.
2696 *
2697 * PARAMETERS:
2698 * word - word to be examined.
2699 * start - starting bit position.
2700 *
2701 * RETURN VALUES:
2702 * bit position of first free bit in the word or 32 if
2703 * no free bits were found.
2704 */
2705static int diFindFree(u32 word, int start)
2706{
2707 int bitno;
2708 assert(start < 32);
2709 /* scan the word for the first free bit. */
2710 for (word <<= start, bitno = start; bitno < 32;
2711 bitno++, word <<= 1) {
2712 if ((word & HIGHORDER) == 0)
2713 break;
2714 }
2715 return (bitno);
2716}
2717
2718/*
2719 * NAME: diUpdatePMap()
2720 *
2721 * FUNCTION: Update the persistent map in an IAG for the allocation or
2722 * freeing of the specified inode.
2723 *
2724 * PRE CONDITIONS: Working map has already been updated for allocate.
2725 *
2726 * PARAMETERS:
2727 * ipimap - Incore inode map inode
2728 * inum - Number of inode to mark in permanent map
2729 * is_free - If 'true' indicates inode should be marked freed, otherwise
2730 * indicates inode should be marked allocated.
2731 *
2732 * RETURN VALUES:
2733 * 0 for success
2734 */
2735int
2736diUpdatePMap(struct inode *ipimap,
2737 unsigned long inum, bool is_free, struct tblock * tblk)
2738{
2739 int rc;
2740 struct iag *iagp;
2741 struct metapage *mp;
2742 int iagno, ino, extno, bitno;
2743 struct inomap *imap;
2744 u32 mask;
2745 struct jfs_log *log;
2746 int lsn, difft, diffp;
2747 unsigned long flags;
2748
2749 imap = JFS_IP(ipimap)->i_imap;
2750 /* get the iag number containing the inode */
2751 iagno = INOTOIAG(inum);
2752 /* make sure that the iag is contained within the map */
2753 if (iagno >= imap->im_nextiag) {
2754 jfs_error(ipimap->i_sb, "the iag is outside the map\n");
2755 return -EIO;
2756 }
2757 /* read the iag */
2758 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2759 rc = diIAGRead(imap, iagno, &mp);
2760 IREAD_UNLOCK(ipimap);
2761 if (rc)
2762 return (rc);
2763 metapage_wait_for_io(mp);
2764 iagp = (struct iag *) mp->data;
2765 /* get the inode number and extent number of the inode within
2766 * the iag and the inode number within the extent.
2767 */
2768 ino = inum & (INOSPERIAG - 1);
2769 extno = ino >> L2INOSPEREXT;
2770 bitno = ino & (INOSPEREXT - 1);
2771 mask = HIGHORDER >> bitno;
2772 /*
2773 * mark the inode free in persistent map:
2774 */
2775 if (is_free) {
2776 /* The inode should have been allocated both in working
2777 * map and in persistent map;
2778 * the inode will be freed from working map at the release
2779 * of last reference release;
2780 */
2781 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2782 jfs_error(ipimap->i_sb,
2783 "inode %ld not marked as allocated in wmap!\n",
2784 inum);
2785 }
2786 if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
2787 jfs_error(ipimap->i_sb,
2788 "inode %ld not marked as allocated in pmap!\n",
2789 inum);
2790 }
2791 /* update the bitmap for the extent of the freed inode */
2792 iagp->pmap[extno] &= cpu_to_le32(~mask);
2793 }
2794 /*
2795 * mark the inode allocated in persistent map:
2796 */
2797 else {
2798 /* The inode should be already allocated in the working map
2799 * and should be free in persistent map;
2800 */
2801 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2802 release_metapage(mp);
2803 jfs_error(ipimap->i_sb,
2804 "the inode is not allocated in the working map\n");
2805 return -EIO;
2806 }
2807 if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
2808 release_metapage(mp);
2809 jfs_error(ipimap->i_sb,
2810 "the inode is not free in the persistent map\n");
2811 return -EIO;
2812 }
2813 /* update the bitmap for the extent of the allocated inode */
2814 iagp->pmap[extno] |= cpu_to_le32(mask);
2815 }
2816 /*
2817 * update iag lsn
2818 */
2819 lsn = tblk->lsn;
2820 log = JFS_SBI(tblk->sb)->log;
2821 LOGSYNC_LOCK(log, flags);
2822 if (mp->lsn != 0) {
2823 /* inherit older/smaller lsn */
2824 logdiff(difft, lsn, log);
2825 logdiff(diffp, mp->lsn, log);
2826 if (difft < diffp) {
2827 mp->lsn = lsn;
2828 /* move mp after tblock in logsync list */
2829 list_move(&mp->synclist, &tblk->synclist);
2830 }
2831 /* inherit younger/larger clsn */
2832 assert(mp->clsn);
2833 logdiff(difft, tblk->clsn, log);
2834 logdiff(diffp, mp->clsn, log);
2835 if (difft > diffp)
2836 mp->clsn = tblk->clsn;
2837 } else {
2838 mp->log = log;
2839 mp->lsn = lsn;
2840 /* insert mp after tblock in logsync list */
2841 log->count++;
2842 list_add(&mp->synclist, &tblk->synclist);
2843 mp->clsn = tblk->clsn;
2844 }
2845 LOGSYNC_UNLOCK(log, flags);
2846 write_metapage(mp);
2847 return (0);
2848}
2849
2850/*
2851 * diExtendFS()
2852 *
2853 * function: update imap for extendfs();
2854 *
2855 * note: AG size has been increased s.t. each k old contiguous AGs are
2856 * coalesced into a new AG;
2857 */
2858int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
2859{
2860 int rc, rcx = 0;
2861 struct inomap *imap = JFS_IP(ipimap)->i_imap;
2862 struct iag *iagp = NULL, *hiagp = NULL;
2863 struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap;
2864 struct metapage *bp, *hbp;
2865 int i, n, head;
2866 int numinos, xnuminos = 0, xnumfree = 0;
2867 s64 agstart;
2868
2869 jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
2870 imap->im_nextiag, atomic_read(&imap->im_numinos),
2871 atomic_read(&imap->im_numfree));
2872
2873 /*
2874 * reconstruct imap
2875 *
2876 * coalesce contiguous k (newAGSize/oldAGSize) AGs;
2877 * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
2878 * note: new AG size = old AG size * (2**x).
2879 */
2880
2881 /* init per AG control information im_agctl[] */
2882 for (i = 0; i < MAXAG; i++) {
2883 imap->im_agctl[i].inofree = -1;
2884 imap->im_agctl[i].extfree = -1;
2885 imap->im_agctl[i].numinos = 0; /* number of backed inodes */
2886 imap->im_agctl[i].numfree = 0; /* number of free backed inodes */
2887 }
2888
2889 /*
2890 * process each iag page of the map.
2891 *
2892 * rebuild AG Free Inode List, AG Free Inode Extent List;
2893 */
2894 for (i = 0; i < imap->im_nextiag; i++) {
2895 if ((rc = diIAGRead(imap, i, &bp))) {
2896 rcx = rc;
2897 continue;
2898 }
2899 iagp = (struct iag *) bp->data;
2900 if (le32_to_cpu(iagp->iagnum) != i) {
2901 release_metapage(bp);
2902 jfs_error(ipimap->i_sb, "unexpected value of iagnum\n");
2903 return -EIO;
2904 }
2905
2906 /* leave free iag in the free iag list */
2907 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2908 release_metapage(bp);
2909 continue;
2910 }
2911
2912 agstart = le64_to_cpu(iagp->agstart);
2913 n = agstart >> mp->db_agl2size;
2914 iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
2915
2916 /* compute backed inodes */
2917 numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
2918 << L2INOSPEREXT;
2919 if (numinos > 0) {
2920 /* merge AG backed inodes */
2921 imap->im_agctl[n].numinos += numinos;
2922 xnuminos += numinos;
2923 }
2924
2925 /* if any backed free inodes, insert at AG free inode list */
2926 if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
2927 if ((head = imap->im_agctl[n].inofree) == -1) {
2928 iagp->inofreefwd = cpu_to_le32(-1);
2929 iagp->inofreeback = cpu_to_le32(-1);
2930 } else {
2931 if ((rc = diIAGRead(imap, head, &hbp))) {
2932 rcx = rc;
2933 goto nextiag;
2934 }
2935 hiagp = (struct iag *) hbp->data;
2936 hiagp->inofreeback = iagp->iagnum;
2937 iagp->inofreefwd = cpu_to_le32(head);
2938 iagp->inofreeback = cpu_to_le32(-1);
2939 write_metapage(hbp);
2940 }
2941
2942 imap->im_agctl[n].inofree =
2943 le32_to_cpu(iagp->iagnum);
2944
2945 /* merge AG backed free inodes */
2946 imap->im_agctl[n].numfree +=
2947 le32_to_cpu(iagp->nfreeinos);
2948 xnumfree += le32_to_cpu(iagp->nfreeinos);
2949 }
2950
2951 /* if any free extents, insert at AG free extent list */
2952 if (le32_to_cpu(iagp->nfreeexts) > 0) {
2953 if ((head = imap->im_agctl[n].extfree) == -1) {
2954 iagp->extfreefwd = cpu_to_le32(-1);
2955 iagp->extfreeback = cpu_to_le32(-1);
2956 } else {
2957 if ((rc = diIAGRead(imap, head, &hbp))) {
2958 rcx = rc;
2959 goto nextiag;
2960 }
2961 hiagp = (struct iag *) hbp->data;
2962 hiagp->extfreeback = iagp->iagnum;
2963 iagp->extfreefwd = cpu_to_le32(head);
2964 iagp->extfreeback = cpu_to_le32(-1);
2965 write_metapage(hbp);
2966 }
2967
2968 imap->im_agctl[n].extfree =
2969 le32_to_cpu(iagp->iagnum);
2970 }
2971
2972 nextiag:
2973 write_metapage(bp);
2974 }
2975
2976 if (xnuminos != atomic_read(&imap->im_numinos) ||
2977 xnumfree != atomic_read(&imap->im_numfree)) {
2978 jfs_error(ipimap->i_sb, "numinos or numfree incorrect\n");
2979 return -EIO;
2980 }
2981
2982 return rcx;
2983}
2984
2985
2986/*
2987 * duplicateIXtree()
2988 *
2989 * serialization: IWRITE_LOCK held on entry/exit
2990 *
2991 * note: shadow page with regular inode (rel.2);
2992 */
2993static void duplicateIXtree(struct super_block *sb, s64 blkno,
2994 int xlen, s64 *xaddr)
2995{
2996 struct jfs_superblock *j_sb;
2997 struct buffer_head *bh;
2998 struct inode *ip;
2999 tid_t tid;
3000
3001 /* if AIT2 ipmap2 is bad, do not try to update it */
3002 if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */
3003 return;
3004 ip = diReadSpecial(sb, FILESYSTEM_I, 1);
3005 if (ip == NULL) {
3006 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3007 if (readSuper(sb, &bh))
3008 return;
3009 j_sb = (struct jfs_superblock *)bh->b_data;
3010 j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
3011
3012 mark_buffer_dirty(bh);
3013 sync_dirty_buffer(bh);
3014 brelse(bh);
3015 return;
3016 }
3017
3018 /* start transaction */
3019 tid = txBegin(sb, COMMIT_FORCE);
3020 /* update the inode map addressing structure to point to it */
3021 if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) {
3022 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3023 txAbort(tid, 1);
3024 goto cleanup;
3025
3026 }
3027 /* update the inode map's inode to reflect the extension */
3028 ip->i_size += PSIZE;
3029 inode_add_bytes(ip, PSIZE);
3030 txCommit(tid, 1, &ip, COMMIT_FORCE);
3031 cleanup:
3032 txEnd(tid);
3033 diFreeSpecial(ip);
3034}
3035
3036/*
3037 * NAME: copy_from_dinode()
3038 *
3039 * FUNCTION: Copies inode info from disk inode to in-memory inode
3040 *
3041 * RETURN VALUES:
3042 * 0 - success
3043 * -ENOMEM - insufficient memory
3044 */
3045static int copy_from_dinode(struct dinode * dip, struct inode *ip)
3046{
3047 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3048 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3049
3050 jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
3051 jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
3052 jfs_set_inode_flags(ip);
3053
3054 ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
3055 if (sbi->umask != -1) {
3056 ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask);
3057 /* For directories, add x permission if r is allowed by umask */
3058 if (S_ISDIR(ip->i_mode)) {
3059 if (ip->i_mode & 0400)
3060 ip->i_mode |= 0100;
3061 if (ip->i_mode & 0040)
3062 ip->i_mode |= 0010;
3063 if (ip->i_mode & 0004)
3064 ip->i_mode |= 0001;
3065 }
3066 }
3067 set_nlink(ip, le32_to_cpu(dip->di_nlink));
3068
3069 jfs_ip->saved_uid = make_kuid(&init_user_ns, le32_to_cpu(dip->di_uid));
3070 if (!uid_valid(sbi->uid))
3071 ip->i_uid = jfs_ip->saved_uid;
3072 else {
3073 ip->i_uid = sbi->uid;
3074 }
3075
3076 jfs_ip->saved_gid = make_kgid(&init_user_ns, le32_to_cpu(dip->di_gid));
3077 if (!gid_valid(sbi->gid))
3078 ip->i_gid = jfs_ip->saved_gid;
3079 else {
3080 ip->i_gid = sbi->gid;
3081 }
3082
3083 ip->i_size = le64_to_cpu(dip->di_size);
3084 ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec);
3085 ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec);
3086 ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec);
3087 ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec);
3088 ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec);
3089 ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec);
3090 ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
3091 ip->i_generation = le32_to_cpu(dip->di_gen);
3092
3093 jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */
3094 jfs_ip->acl = dip->di_acl; /* as are dxd's */
3095 jfs_ip->ea = dip->di_ea;
3096 jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
3097 jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
3098 jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
3099
3100 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
3101 jfs_ip->dev = le32_to_cpu(dip->di_rdev);
3102 ip->i_rdev = new_decode_dev(jfs_ip->dev);
3103 }
3104
3105 if (S_ISDIR(ip->i_mode)) {
3106 memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384);
3107 } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
3108 memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
3109 } else
3110 memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
3111
3112 /* Zero the in-memory-only stuff */
3113 jfs_ip->cflag = 0;
3114 jfs_ip->btindex = 0;
3115 jfs_ip->btorder = 0;
3116 jfs_ip->bxflag = 0;
3117 jfs_ip->blid = 0;
3118 jfs_ip->atlhead = 0;
3119 jfs_ip->atltail = 0;
3120 jfs_ip->xtlid = 0;
3121 return (0);
3122}
3123
3124/*
3125 * NAME: copy_to_dinode()
3126 *
3127 * FUNCTION: Copies inode info from in-memory inode to disk inode
3128 */
3129static void copy_to_dinode(struct dinode * dip, struct inode *ip)
3130{
3131 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3132 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3133
3134 dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
3135 dip->di_inostamp = cpu_to_le32(sbi->inostamp);
3136 dip->di_number = cpu_to_le32(ip->i_ino);
3137 dip->di_gen = cpu_to_le32(ip->i_generation);
3138 dip->di_size = cpu_to_le64(ip->i_size);
3139 dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
3140 dip->di_nlink = cpu_to_le32(ip->i_nlink);
3141 if (!uid_valid(sbi->uid))
3142 dip->di_uid = cpu_to_le32(i_uid_read(ip));
3143 else
3144 dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns,
3145 jfs_ip->saved_uid));
3146 if (!gid_valid(sbi->gid))
3147 dip->di_gid = cpu_to_le32(i_gid_read(ip));
3148 else
3149 dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns,
3150 jfs_ip->saved_gid));
3151 /*
3152 * mode2 is only needed for storing the higher order bits.
3153 * Trust i_mode for the lower order ones
3154 */
3155 if (sbi->umask == -1)
3156 dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) |
3157 ip->i_mode);
3158 else /* Leave the original permissions alone */
3159 dip->di_mode = cpu_to_le32(jfs_ip->mode2);
3160
3161 dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec);
3162 dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec);
3163 dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec);
3164 dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec);
3165 dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec);
3166 dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec);
3167 dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */
3168 dip->di_acl = jfs_ip->acl; /* as are dxd's */
3169 dip->di_ea = jfs_ip->ea;
3170 dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
3171 dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
3172 dip->di_otime.tv_nsec = 0;
3173 dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
3174 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
3175 dip->di_rdev = cpu_to_le32(jfs_ip->dev);
3176}
1/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19/*
20 * jfs_imap.c: inode allocation map manager
21 *
22 * Serialization:
23 * Each AG has a simple lock which is used to control the serialization of
24 * the AG level lists. This lock should be taken first whenever an AG
25 * level list will be modified or accessed.
26 *
27 * Each IAG is locked by obtaining the buffer for the IAG page.
28 *
29 * There is also a inode lock for the inode map inode. A read lock needs to
30 * be taken whenever an IAG is read from the map or the global level
31 * information is read. A write lock needs to be taken whenever the global
32 * level information is modified or an atomic operation needs to be used.
33 *
34 * If more than one IAG is read at one time, the read lock may not
35 * be given up until all of the IAG's are read. Otherwise, a deadlock
36 * may occur when trying to obtain the read lock while another thread
37 * holding the read lock is waiting on the IAG already being held.
38 *
39 * The control page of the inode map is read into memory by diMount().
40 * Thereafter it should only be modified in memory and then it will be
41 * written out when the filesystem is unmounted by diUnmount().
42 */
43
44#include <linux/fs.h>
45#include <linux/buffer_head.h>
46#include <linux/pagemap.h>
47#include <linux/quotaops.h>
48#include <linux/slab.h>
49
50#include "jfs_incore.h"
51#include "jfs_inode.h"
52#include "jfs_filsys.h"
53#include "jfs_dinode.h"
54#include "jfs_dmap.h"
55#include "jfs_imap.h"
56#include "jfs_metapage.h"
57#include "jfs_superblock.h"
58#include "jfs_debug.h"
59
60/*
61 * imap locks
62 */
63/* iag free list lock */
64#define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock)
65#define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock)
66#define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock)
67
68/* per ag iag list locks */
69#define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index]))
70#define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno])
71#define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno])
72
73/*
74 * forward references
75 */
76static int diAllocAG(struct inomap *, int, bool, struct inode *);
77static int diAllocAny(struct inomap *, int, bool, struct inode *);
78static int diAllocBit(struct inomap *, struct iag *, int);
79static int diAllocExt(struct inomap *, int, struct inode *);
80static int diAllocIno(struct inomap *, int, struct inode *);
81static int diFindFree(u32, int);
82static int diNewExt(struct inomap *, struct iag *, int);
83static int diNewIAG(struct inomap *, int *, int, struct metapage **);
84static void duplicateIXtree(struct super_block *, s64, int, s64 *);
85
86static int diIAGRead(struct inomap * imap, int, struct metapage **);
87static int copy_from_dinode(struct dinode *, struct inode *);
88static void copy_to_dinode(struct dinode *, struct inode *);
89
90/*
91 * NAME: diMount()
92 *
93 * FUNCTION: initialize the incore inode map control structures for
94 * a fileset or aggregate init time.
95 *
96 * the inode map's control structure (dinomap) is
97 * brought in from disk and placed in virtual memory.
98 *
99 * PARAMETERS:
100 * ipimap - pointer to inode map inode for the aggregate or fileset.
101 *
102 * RETURN VALUES:
103 * 0 - success
104 * -ENOMEM - insufficient free virtual memory.
105 * -EIO - i/o error.
106 */
107int diMount(struct inode *ipimap)
108{
109 struct inomap *imap;
110 struct metapage *mp;
111 int index;
112 struct dinomap_disk *dinom_le;
113
114 /*
115 * allocate/initialize the in-memory inode map control structure
116 */
117 /* allocate the in-memory inode map control structure. */
118 imap = kmalloc(sizeof(struct inomap), GFP_KERNEL);
119 if (imap == NULL) {
120 jfs_err("diMount: kmalloc returned NULL!");
121 return -ENOMEM;
122 }
123
124 /* read the on-disk inode map control structure. */
125
126 mp = read_metapage(ipimap,
127 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
128 PSIZE, 0);
129 if (mp == NULL) {
130 kfree(imap);
131 return -EIO;
132 }
133
134 /* copy the on-disk version to the in-memory version. */
135 dinom_le = (struct dinomap_disk *) mp->data;
136 imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
137 imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
138 atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
139 atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
140 imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
141 imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
142 for (index = 0; index < MAXAG; index++) {
143 imap->im_agctl[index].inofree =
144 le32_to_cpu(dinom_le->in_agctl[index].inofree);
145 imap->im_agctl[index].extfree =
146 le32_to_cpu(dinom_le->in_agctl[index].extfree);
147 imap->im_agctl[index].numinos =
148 le32_to_cpu(dinom_le->in_agctl[index].numinos);
149 imap->im_agctl[index].numfree =
150 le32_to_cpu(dinom_le->in_agctl[index].numfree);
151 }
152
153 /* release the buffer. */
154 release_metapage(mp);
155
156 /*
157 * allocate/initialize inode allocation map locks
158 */
159 /* allocate and init iag free list lock */
160 IAGFREE_LOCK_INIT(imap);
161
162 /* allocate and init ag list locks */
163 for (index = 0; index < MAXAG; index++) {
164 AG_LOCK_INIT(imap, index);
165 }
166
167 /* bind the inode map inode and inode map control structure
168 * to each other.
169 */
170 imap->im_ipimap = ipimap;
171 JFS_IP(ipimap)->i_imap = imap;
172
173 return (0);
174}
175
176
177/*
178 * NAME: diUnmount()
179 *
180 * FUNCTION: write to disk the incore inode map control structures for
181 * a fileset or aggregate at unmount time.
182 *
183 * PARAMETERS:
184 * ipimap - pointer to inode map inode for the aggregate or fileset.
185 *
186 * RETURN VALUES:
187 * 0 - success
188 * -ENOMEM - insufficient free virtual memory.
189 * -EIO - i/o error.
190 */
191int diUnmount(struct inode *ipimap, int mounterror)
192{
193 struct inomap *imap = JFS_IP(ipimap)->i_imap;
194
195 /*
196 * update the on-disk inode map control structure
197 */
198
199 if (!(mounterror || isReadOnly(ipimap)))
200 diSync(ipimap);
201
202 /*
203 * Invalidate the page cache buffers
204 */
205 truncate_inode_pages(ipimap->i_mapping, 0);
206
207 /*
208 * free in-memory control structure
209 */
210 kfree(imap);
211
212 return (0);
213}
214
215
216/*
217 * diSync()
218 */
219int diSync(struct inode *ipimap)
220{
221 struct dinomap_disk *dinom_le;
222 struct inomap *imp = JFS_IP(ipimap)->i_imap;
223 struct metapage *mp;
224 int index;
225
226 /*
227 * write imap global conrol page
228 */
229 /* read the on-disk inode map control structure */
230 mp = get_metapage(ipimap,
231 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
232 PSIZE, 0);
233 if (mp == NULL) {
234 jfs_err("diSync: get_metapage failed!");
235 return -EIO;
236 }
237
238 /* copy the in-memory version to the on-disk version */
239 dinom_le = (struct dinomap_disk *) mp->data;
240 dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
241 dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
242 dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
243 dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
244 dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
245 dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
246 for (index = 0; index < MAXAG; index++) {
247 dinom_le->in_agctl[index].inofree =
248 cpu_to_le32(imp->im_agctl[index].inofree);
249 dinom_le->in_agctl[index].extfree =
250 cpu_to_le32(imp->im_agctl[index].extfree);
251 dinom_le->in_agctl[index].numinos =
252 cpu_to_le32(imp->im_agctl[index].numinos);
253 dinom_le->in_agctl[index].numfree =
254 cpu_to_le32(imp->im_agctl[index].numfree);
255 }
256
257 /* write out the control structure */
258 write_metapage(mp);
259
260 /*
261 * write out dirty pages of imap
262 */
263 filemap_write_and_wait(ipimap->i_mapping);
264
265 diWriteSpecial(ipimap, 0);
266
267 return (0);
268}
269
270
271/*
272 * NAME: diRead()
273 *
274 * FUNCTION: initialize an incore inode from disk.
275 *
276 * on entry, the specifed incore inode should itself
277 * specify the disk inode number corresponding to the
278 * incore inode (i.e. i_number should be initialized).
279 *
280 * this routine handles incore inode initialization for
281 * both "special" and "regular" inodes. special inodes
282 * are those required early in the mount process and
283 * require special handling since much of the file system
284 * is not yet initialized. these "special" inodes are
285 * identified by a NULL inode map inode pointer and are
286 * actually initialized by a call to diReadSpecial().
287 *
288 * for regular inodes, the iag describing the disk inode
289 * is read from disk to determine the inode extent address
290 * for the disk inode. with the inode extent address in
291 * hand, the page of the extent that contains the disk
292 * inode is read and the disk inode is copied to the
293 * incore inode.
294 *
295 * PARAMETERS:
296 * ip - pointer to incore inode to be initialized from disk.
297 *
298 * RETURN VALUES:
299 * 0 - success
300 * -EIO - i/o error.
301 * -ENOMEM - insufficient memory
302 *
303 */
304int diRead(struct inode *ip)
305{
306 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
307 int iagno, ino, extno, rc;
308 struct inode *ipimap;
309 struct dinode *dp;
310 struct iag *iagp;
311 struct metapage *mp;
312 s64 blkno, agstart;
313 struct inomap *imap;
314 int block_offset;
315 int inodes_left;
316 unsigned long pageno;
317 int rel_inode;
318
319 jfs_info("diRead: ino = %ld", ip->i_ino);
320
321 ipimap = sbi->ipimap;
322 JFS_IP(ip)->ipimap = ipimap;
323
324 /* determine the iag number for this inode (number) */
325 iagno = INOTOIAG(ip->i_ino);
326
327 /* read the iag */
328 imap = JFS_IP(ipimap)->i_imap;
329 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
330 rc = diIAGRead(imap, iagno, &mp);
331 IREAD_UNLOCK(ipimap);
332 if (rc) {
333 jfs_err("diRead: diIAGRead returned %d", rc);
334 return (rc);
335 }
336
337 iagp = (struct iag *) mp->data;
338
339 /* determine inode extent that holds the disk inode */
340 ino = ip->i_ino & (INOSPERIAG - 1);
341 extno = ino >> L2INOSPEREXT;
342
343 if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) ||
344 (addressPXD(&iagp->inoext[extno]) == 0)) {
345 release_metapage(mp);
346 return -ESTALE;
347 }
348
349 /* get disk block number of the page within the inode extent
350 * that holds the disk inode.
351 */
352 blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);
353
354 /* get the ag for the iag */
355 agstart = le64_to_cpu(iagp->agstart);
356
357 release_metapage(mp);
358
359 rel_inode = (ino & (INOSPERPAGE - 1));
360 pageno = blkno >> sbi->l2nbperpage;
361
362 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
363 /*
364 * OS/2 didn't always align inode extents on page boundaries
365 */
366 inodes_left =
367 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
368
369 if (rel_inode < inodes_left)
370 rel_inode += block_offset << sbi->l2niperblk;
371 else {
372 pageno += 1;
373 rel_inode -= inodes_left;
374 }
375 }
376
377 /* read the page of disk inode */
378 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
379 if (!mp) {
380 jfs_err("diRead: read_metapage failed");
381 return -EIO;
382 }
383
384 /* locate the disk inode requested */
385 dp = (struct dinode *) mp->data;
386 dp += rel_inode;
387
388 if (ip->i_ino != le32_to_cpu(dp->di_number)) {
389 jfs_error(ip->i_sb, "i_ino != di_number\n");
390 rc = -EIO;
391 } else if (le32_to_cpu(dp->di_nlink) == 0)
392 rc = -ESTALE;
393 else
394 /* copy the disk inode to the in-memory inode */
395 rc = copy_from_dinode(dp, ip);
396
397 release_metapage(mp);
398
399 /* set the ag for the inode */
400 JFS_IP(ip)->agstart = agstart;
401 JFS_IP(ip)->active_ag = -1;
402
403 return (rc);
404}
405
406
407/*
408 * NAME: diReadSpecial()
409 *
410 * FUNCTION: initialize a 'special' inode from disk.
411 *
412 * this routines handles aggregate level inodes. The
413 * inode cache cannot differentiate between the
414 * aggregate inodes and the filesystem inodes, so we
415 * handle these here. We don't actually use the aggregate
416 * inode map, since these inodes are at a fixed location
417 * and in some cases the aggregate inode map isn't initialized
418 * yet.
419 *
420 * PARAMETERS:
421 * sb - filesystem superblock
422 * inum - aggregate inode number
423 * secondary - 1 if secondary aggregate inode table
424 *
425 * RETURN VALUES:
426 * new inode - success
427 * NULL - i/o error.
428 */
429struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
430{
431 struct jfs_sb_info *sbi = JFS_SBI(sb);
432 uint address;
433 struct dinode *dp;
434 struct inode *ip;
435 struct metapage *mp;
436
437 ip = new_inode(sb);
438 if (ip == NULL) {
439 jfs_err("diReadSpecial: new_inode returned NULL!");
440 return ip;
441 }
442
443 if (secondary) {
444 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
445 JFS_IP(ip)->ipimap = sbi->ipaimap2;
446 } else {
447 address = AITBL_OFF >> L2PSIZE;
448 JFS_IP(ip)->ipimap = sbi->ipaimap;
449 }
450
451 ASSERT(inum < INOSPEREXT);
452
453 ip->i_ino = inum;
454
455 address += inum >> 3; /* 8 inodes per 4K page */
456
457 /* read the page of fixed disk inode (AIT) in raw mode */
458 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
459 if (mp == NULL) {
460 set_nlink(ip, 1); /* Don't want iput() deleting it */
461 iput(ip);
462 return (NULL);
463 }
464
465 /* get the pointer to the disk inode of interest */
466 dp = (struct dinode *) (mp->data);
467 dp += inum % 8; /* 8 inodes per 4K page */
468
469 /* copy on-disk inode to in-memory inode */
470 if ((copy_from_dinode(dp, ip)) != 0) {
471 /* handle bad return by returning NULL for ip */
472 set_nlink(ip, 1); /* Don't want iput() deleting it */
473 iput(ip);
474 /* release the page */
475 release_metapage(mp);
476 return (NULL);
477
478 }
479
480 ip->i_mapping->a_ops = &jfs_metapage_aops;
481 mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);
482
483 /* Allocations to metadata inodes should not affect quotas */
484 ip->i_flags |= S_NOQUOTA;
485
486 if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
487 sbi->gengen = le32_to_cpu(dp->di_gengen);
488 sbi->inostamp = le32_to_cpu(dp->di_inostamp);
489 }
490
491 /* release the page */
492 release_metapage(mp);
493
494 /*
495 * __mark_inode_dirty expects inodes to be hashed. Since we don't
496 * want special inodes in the fileset inode space, we make them
497 * appear hashed, but do not put on any lists. hlist_del()
498 * will work fine and require no locking.
499 */
500 hlist_add_fake(&ip->i_hash);
501
502 return (ip);
503}
504
505/*
506 * NAME: diWriteSpecial()
507 *
508 * FUNCTION: Write the special inode to disk
509 *
510 * PARAMETERS:
511 * ip - special inode
512 * secondary - 1 if secondary aggregate inode table
513 *
514 * RETURN VALUES: none
515 */
516
517void diWriteSpecial(struct inode *ip, int secondary)
518{
519 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
520 uint address;
521 struct dinode *dp;
522 ino_t inum = ip->i_ino;
523 struct metapage *mp;
524
525 if (secondary)
526 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
527 else
528 address = AITBL_OFF >> L2PSIZE;
529
530 ASSERT(inum < INOSPEREXT);
531
532 address += inum >> 3; /* 8 inodes per 4K page */
533
534 /* read the page of fixed disk inode (AIT) in raw mode */
535 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
536 if (mp == NULL) {
537 jfs_err("diWriteSpecial: failed to read aggregate inode "
538 "extent!");
539 return;
540 }
541
542 /* get the pointer to the disk inode of interest */
543 dp = (struct dinode *) (mp->data);
544 dp += inum % 8; /* 8 inodes per 4K page */
545
546 /* copy on-disk inode to in-memory inode */
547 copy_to_dinode(dp, ip);
548 memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
549
550 if (inum == FILESYSTEM_I)
551 dp->di_gengen = cpu_to_le32(sbi->gengen);
552
553 /* write the page */
554 write_metapage(mp);
555}
556
557/*
558 * NAME: diFreeSpecial()
559 *
560 * FUNCTION: Free allocated space for special inode
561 */
562void diFreeSpecial(struct inode *ip)
563{
564 if (ip == NULL) {
565 jfs_err("diFreeSpecial called with NULL ip!");
566 return;
567 }
568 filemap_write_and_wait(ip->i_mapping);
569 truncate_inode_pages(ip->i_mapping, 0);
570 iput(ip);
571}
572
573
574
575/*
576 * NAME: diWrite()
577 *
578 * FUNCTION: write the on-disk inode portion of the in-memory inode
579 * to its corresponding on-disk inode.
580 *
581 * on entry, the specifed incore inode should itself
582 * specify the disk inode number corresponding to the
583 * incore inode (i.e. i_number should be initialized).
584 *
585 * the inode contains the inode extent address for the disk
586 * inode. with the inode extent address in hand, the
587 * page of the extent that contains the disk inode is
588 * read and the disk inode portion of the incore inode
589 * is copied to the disk inode.
590 *
591 * PARAMETERS:
592 * tid - transacation id
593 * ip - pointer to incore inode to be written to the inode extent.
594 *
595 * RETURN VALUES:
596 * 0 - success
597 * -EIO - i/o error.
598 */
599int diWrite(tid_t tid, struct inode *ip)
600{
601 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
602 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
603 int rc = 0;
604 s32 ino;
605 struct dinode *dp;
606 s64 blkno;
607 int block_offset;
608 int inodes_left;
609 struct metapage *mp;
610 unsigned long pageno;
611 int rel_inode;
612 int dioffset;
613 struct inode *ipimap;
614 uint type;
615 lid_t lid;
616 struct tlock *ditlck, *tlck;
617 struct linelock *dilinelock, *ilinelock;
618 struct lv *lv;
619 int n;
620
621 ipimap = jfs_ip->ipimap;
622
623 ino = ip->i_ino & (INOSPERIAG - 1);
624
625 if (!addressPXD(&(jfs_ip->ixpxd)) ||
626 (lengthPXD(&(jfs_ip->ixpxd)) !=
627 JFS_IP(ipimap)->i_imap->im_nbperiext)) {
628 jfs_error(ip->i_sb, "ixpxd invalid\n");
629 return -EIO;
630 }
631
632 /*
633 * read the page of disk inode containing the specified inode:
634 */
635 /* compute the block address of the page */
636 blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
637
638 rel_inode = (ino & (INOSPERPAGE - 1));
639 pageno = blkno >> sbi->l2nbperpage;
640
641 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
642 /*
643 * OS/2 didn't always align inode extents on page boundaries
644 */
645 inodes_left =
646 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
647
648 if (rel_inode < inodes_left)
649 rel_inode += block_offset << sbi->l2niperblk;
650 else {
651 pageno += 1;
652 rel_inode -= inodes_left;
653 }
654 }
655 /* read the page of disk inode */
656 retry:
657 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
658 if (!mp)
659 return -EIO;
660
661 /* get the pointer to the disk inode */
662 dp = (struct dinode *) mp->data;
663 dp += rel_inode;
664
665 dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
666
667 /*
668 * acquire transaction lock on the on-disk inode;
669 * N.B. tlock is acquired on ipimap not ip;
670 */
671 if ((ditlck =
672 txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
673 goto retry;
674 dilinelock = (struct linelock *) & ditlck->lock;
675
676 /*
677 * copy btree root from in-memory inode to on-disk inode
678 *
679 * (tlock is taken from inline B+-tree root in in-memory
680 * inode when the B+-tree root is updated, which is pointed
681 * by jfs_ip->blid as well as being on tx tlock list)
682 *
683 * further processing of btree root is based on the copy
684 * in in-memory inode, where txLog() will log from, and,
685 * for xtree root, txUpdateMap() will update map and reset
686 * XAD_NEW bit;
687 */
688
689 if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
690 /*
691 * This is the special xtree inside the directory for storing
692 * the directory table
693 */
694 xtpage_t *p, *xp;
695 xad_t *xad;
696
697 jfs_ip->xtlid = 0;
698 tlck = lid_to_tlock(lid);
699 assert(tlck->type & tlckXTREE);
700 tlck->type |= tlckBTROOT;
701 tlck->mp = mp;
702 ilinelock = (struct linelock *) & tlck->lock;
703
704 /*
705 * copy xtree root from inode to dinode:
706 */
707 p = &jfs_ip->i_xtroot;
708 xp = (xtpage_t *) &dp->di_dirtable;
709 lv = ilinelock->lv;
710 for (n = 0; n < ilinelock->index; n++, lv++) {
711 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
712 lv->length << L2XTSLOTSIZE);
713 }
714
715 /* reset on-disk (metadata page) xtree XAD_NEW bit */
716 xad = &xp->xad[XTENTRYSTART];
717 for (n = XTENTRYSTART;
718 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
719 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
720 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
721 }
722
723 if ((lid = jfs_ip->blid) == 0)
724 goto inlineData;
725 jfs_ip->blid = 0;
726
727 tlck = lid_to_tlock(lid);
728 type = tlck->type;
729 tlck->type |= tlckBTROOT;
730 tlck->mp = mp;
731 ilinelock = (struct linelock *) & tlck->lock;
732
733 /*
734 * regular file: 16 byte (XAD slot) granularity
735 */
736 if (type & tlckXTREE) {
737 xtpage_t *p, *xp;
738 xad_t *xad;
739
740 /*
741 * copy xtree root from inode to dinode:
742 */
743 p = &jfs_ip->i_xtroot;
744 xp = &dp->di_xtroot;
745 lv = ilinelock->lv;
746 for (n = 0; n < ilinelock->index; n++, lv++) {
747 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
748 lv->length << L2XTSLOTSIZE);
749 }
750
751 /* reset on-disk (metadata page) xtree XAD_NEW bit */
752 xad = &xp->xad[XTENTRYSTART];
753 for (n = XTENTRYSTART;
754 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
755 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
756 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
757 }
758 /*
759 * directory: 32 byte (directory entry slot) granularity
760 */
761 else if (type & tlckDTREE) {
762 dtpage_t *p, *xp;
763
764 /*
765 * copy dtree root from inode to dinode:
766 */
767 p = (dtpage_t *) &jfs_ip->i_dtroot;
768 xp = (dtpage_t *) & dp->di_dtroot;
769 lv = ilinelock->lv;
770 for (n = 0; n < ilinelock->index; n++, lv++) {
771 memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
772 lv->length << L2DTSLOTSIZE);
773 }
774 } else {
775 jfs_err("diWrite: UFO tlock");
776 }
777
778 inlineData:
779 /*
780 * copy inline symlink from in-memory inode to on-disk inode
781 */
782 if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
783 lv = & dilinelock->lv[dilinelock->index];
784 lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
785 lv->length = 2;
786 memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
787 dilinelock->index++;
788 }
789 /*
790 * copy inline data from in-memory inode to on-disk inode:
791 * 128 byte slot granularity
792 */
793 if (test_cflag(COMMIT_Inlineea, ip)) {
794 lv = & dilinelock->lv[dilinelock->index];
795 lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
796 lv->length = 1;
797 memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
798 dilinelock->index++;
799
800 clear_cflag(COMMIT_Inlineea, ip);
801 }
802
803 /*
804 * lock/copy inode base: 128 byte slot granularity
805 */
806 lv = & dilinelock->lv[dilinelock->index];
807 lv->offset = dioffset >> L2INODESLOTSIZE;
808 copy_to_dinode(dp, ip);
809 if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
810 lv->length = 2;
811 memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
812 } else
813 lv->length = 1;
814 dilinelock->index++;
815
816 /* release the buffer holding the updated on-disk inode.
817 * the buffer will be later written by commit processing.
818 */
819 write_metapage(mp);
820
821 return (rc);
822}
823
824
825/*
826 * NAME: diFree(ip)
827 *
828 * FUNCTION: free a specified inode from the inode working map
829 * for a fileset or aggregate.
830 *
831 * if the inode to be freed represents the first (only)
832 * free inode within the iag, the iag will be placed on
833 * the ag free inode list.
834 *
835 * freeing the inode will cause the inode extent to be
836 * freed if the inode is the only allocated inode within
837 * the extent. in this case all the disk resource backing
838 * up the inode extent will be freed. in addition, the iag
839 * will be placed on the ag extent free list if the extent
840 * is the first free extent in the iag. if freeing the
841 * extent also means that no free inodes will exist for
842 * the iag, the iag will also be removed from the ag free
843 * inode list.
844 *
845 * the iag describing the inode will be freed if the extent
846 * is to be freed and it is the only backed extent within
847 * the iag. in this case, the iag will be removed from the
848 * ag free extent list and ag free inode list and placed on
849 * the inode map's free iag list.
850 *
851 * a careful update approach is used to provide consistency
852 * in the face of updates to multiple buffers. under this
853 * approach, all required buffers are obtained before making
854 * any updates and are held until all updates are complete.
855 *
856 * PARAMETERS:
857 * ip - inode to be freed.
858 *
859 * RETURN VALUES:
860 * 0 - success
861 * -EIO - i/o error.
862 */
863int diFree(struct inode *ip)
864{
865 int rc;
866 ino_t inum = ip->i_ino;
867 struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
868 struct metapage *mp, *amp, *bmp, *cmp, *dmp;
869 int iagno, ino, extno, bitno, sword, agno;
870 int back, fwd;
871 u32 bitmap, mask;
872 struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
873 struct inomap *imap = JFS_IP(ipimap)->i_imap;
874 pxd_t freepxd;
875 tid_t tid;
876 struct inode *iplist[3];
877 struct tlock *tlck;
878 struct pxd_lock *pxdlock;
879
880 /*
881 * This is just to suppress compiler warnings. The same logic that
882 * references these variables is used to initialize them.
883 */
884 aiagp = biagp = ciagp = diagp = NULL;
885
886 /* get the iag number containing the inode.
887 */
888 iagno = INOTOIAG(inum);
889
890 /* make sure that the iag is contained within
891 * the map.
892 */
893 if (iagno >= imap->im_nextiag) {
894 print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4,
895 imap, 32, 0);
896 jfs_error(ip->i_sb, "inum = %d, iagno = %d, nextiag = %d\n",
897 (uint) inum, iagno, imap->im_nextiag);
898 return -EIO;
899 }
900
901 /* get the allocation group for this ino.
902 */
903 agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
904
905 /* Lock the AG specific inode map information
906 */
907 AG_LOCK(imap, agno);
908
909 /* Obtain read lock in imap inode. Don't release it until we have
910 * read all of the IAG's that we are going to.
911 */
912 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
913
914 /* read the iag.
915 */
916 if ((rc = diIAGRead(imap, iagno, &mp))) {
917 IREAD_UNLOCK(ipimap);
918 AG_UNLOCK(imap, agno);
919 return (rc);
920 }
921 iagp = (struct iag *) mp->data;
922
923 /* get the inode number and extent number of the inode within
924 * the iag and the inode number within the extent.
925 */
926 ino = inum & (INOSPERIAG - 1);
927 extno = ino >> L2INOSPEREXT;
928 bitno = ino & (INOSPEREXT - 1);
929 mask = HIGHORDER >> bitno;
930
931 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
932 jfs_error(ip->i_sb, "wmap shows inode already free\n");
933 }
934
935 if (!addressPXD(&iagp->inoext[extno])) {
936 release_metapage(mp);
937 IREAD_UNLOCK(ipimap);
938 AG_UNLOCK(imap, agno);
939 jfs_error(ip->i_sb, "invalid inoext\n");
940 return -EIO;
941 }
942
943 /* compute the bitmap for the extent reflecting the freed inode.
944 */
945 bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
946
947 if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
948 release_metapage(mp);
949 IREAD_UNLOCK(ipimap);
950 AG_UNLOCK(imap, agno);
951 jfs_error(ip->i_sb, "numfree > numinos\n");
952 return -EIO;
953 }
954 /*
955 * inode extent still has some inodes or below low water mark:
956 * keep the inode extent;
957 */
958 if (bitmap ||
959 imap->im_agctl[agno].numfree < 96 ||
960 (imap->im_agctl[agno].numfree < 288 &&
961 (((imap->im_agctl[agno].numfree * 100) /
962 imap->im_agctl[agno].numinos) <= 25))) {
963 /* if the iag currently has no free inodes (i.e.,
964 * the inode being freed is the first free inode of iag),
965 * insert the iag at head of the inode free list for the ag.
966 */
967 if (iagp->nfreeinos == 0) {
968 /* check if there are any iags on the ag inode
969 * free list. if so, read the first one so that
970 * we can link the current iag onto the list at
971 * the head.
972 */
973 if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
974 /* read the iag that currently is the head
975 * of the list.
976 */
977 if ((rc = diIAGRead(imap, fwd, &))) {
978 IREAD_UNLOCK(ipimap);
979 AG_UNLOCK(imap, agno);
980 release_metapage(mp);
981 return (rc);
982 }
983 aiagp = (struct iag *) amp->data;
984
985 /* make current head point back to the iag.
986 */
987 aiagp->inofreeback = cpu_to_le32(iagno);
988
989 write_metapage(amp);
990 }
991
992 /* iag points forward to current head and iag
993 * becomes the new head of the list.
994 */
995 iagp->inofreefwd =
996 cpu_to_le32(imap->im_agctl[agno].inofree);
997 iagp->inofreeback = cpu_to_le32(-1);
998 imap->im_agctl[agno].inofree = iagno;
999 }
1000 IREAD_UNLOCK(ipimap);
1001
1002 /* update the free inode summary map for the extent if
1003 * freeing the inode means the extent will now have free
1004 * inodes (i.e., the inode being freed is the first free
1005 * inode of extent),
1006 */
1007 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
1008 sword = extno >> L2EXTSPERSUM;
1009 bitno = extno & (EXTSPERSUM - 1);
1010 iagp->inosmap[sword] &=
1011 cpu_to_le32(~(HIGHORDER >> bitno));
1012 }
1013
1014 /* update the bitmap.
1015 */
1016 iagp->wmap[extno] = cpu_to_le32(bitmap);
1017
1018 /* update the free inode counts at the iag, ag and
1019 * map level.
1020 */
1021 le32_add_cpu(&iagp->nfreeinos, 1);
1022 imap->im_agctl[agno].numfree += 1;
1023 atomic_inc(&imap->im_numfree);
1024
1025 /* release the AG inode map lock
1026 */
1027 AG_UNLOCK(imap, agno);
1028
1029 /* write the iag */
1030 write_metapage(mp);
1031
1032 return (0);
1033 }
1034
1035
1036 /*
1037 * inode extent has become free and above low water mark:
1038 * free the inode extent;
1039 */
1040
1041 /*
1042 * prepare to update iag list(s) (careful update step 1)
1043 */
1044 amp = bmp = cmp = dmp = NULL;
1045 fwd = back = -1;
1046
1047 /* check if the iag currently has no free extents. if so,
1048 * it will be placed on the head of the ag extent free list.
1049 */
1050 if (iagp->nfreeexts == 0) {
1051 /* check if the ag extent free list has any iags.
1052 * if so, read the iag at the head of the list now.
1053 * this (head) iag will be updated later to reflect
1054 * the addition of the current iag at the head of
1055 * the list.
1056 */
1057 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
1058 if ((rc = diIAGRead(imap, fwd, &)))
1059 goto error_out;
1060 aiagp = (struct iag *) amp->data;
1061 }
1062 } else {
1063 /* iag has free extents. check if the addition of a free
1064 * extent will cause all extents to be free within this
1065 * iag. if so, the iag will be removed from the ag extent
1066 * free list and placed on the inode map's free iag list.
1067 */
1068 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1069 /* in preparation for removing the iag from the
1070 * ag extent free list, read the iags preceding
1071 * and following the iag on the ag extent free
1072 * list.
1073 */
1074 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
1075 if ((rc = diIAGRead(imap, fwd, &)))
1076 goto error_out;
1077 aiagp = (struct iag *) amp->data;
1078 }
1079
1080 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
1081 if ((rc = diIAGRead(imap, back, &bmp)))
1082 goto error_out;
1083 biagp = (struct iag *) bmp->data;
1084 }
1085 }
1086 }
1087
1088 /* remove the iag from the ag inode free list if freeing
1089 * this extent cause the iag to have no free inodes.
1090 */
1091 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1092 int inofreeback = le32_to_cpu(iagp->inofreeback);
1093 int inofreefwd = le32_to_cpu(iagp->inofreefwd);
1094
1095 /* in preparation for removing the iag from the
1096 * ag inode free list, read the iags preceding
1097 * and following the iag on the ag inode free
1098 * list. before reading these iags, we must make
1099 * sure that we already don't have them in hand
1100 * from up above, since re-reading an iag (buffer)
1101 * we are currently holding would cause a deadlock.
1102 */
1103 if (inofreefwd >= 0) {
1104
1105 if (inofreefwd == fwd)
1106 ciagp = (struct iag *) amp->data;
1107 else if (inofreefwd == back)
1108 ciagp = (struct iag *) bmp->data;
1109 else {
1110 if ((rc =
1111 diIAGRead(imap, inofreefwd, &cmp)))
1112 goto error_out;
1113 ciagp = (struct iag *) cmp->data;
1114 }
1115 assert(ciagp != NULL);
1116 }
1117
1118 if (inofreeback >= 0) {
1119 if (inofreeback == fwd)
1120 diagp = (struct iag *) amp->data;
1121 else if (inofreeback == back)
1122 diagp = (struct iag *) bmp->data;
1123 else {
1124 if ((rc =
1125 diIAGRead(imap, inofreeback, &dmp)))
1126 goto error_out;
1127 diagp = (struct iag *) dmp->data;
1128 }
1129 assert(diagp != NULL);
1130 }
1131 }
1132
1133 IREAD_UNLOCK(ipimap);
1134
1135 /*
1136 * invalidate any page of the inode extent freed from buffer cache;
1137 */
1138 freepxd = iagp->inoext[extno];
1139 invalidate_pxd_metapages(ip, freepxd);
1140
1141 /*
1142 * update iag list(s) (careful update step 2)
1143 */
1144 /* add the iag to the ag extent free list if this is the
1145 * first free extent for the iag.
1146 */
1147 if (iagp->nfreeexts == 0) {
1148 if (fwd >= 0)
1149 aiagp->extfreeback = cpu_to_le32(iagno);
1150
1151 iagp->extfreefwd =
1152 cpu_to_le32(imap->im_agctl[agno].extfree);
1153 iagp->extfreeback = cpu_to_le32(-1);
1154 imap->im_agctl[agno].extfree = iagno;
1155 } else {
1156 /* remove the iag from the ag extent list if all extents
1157 * are now free and place it on the inode map iag free list.
1158 */
1159 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1160 if (fwd >= 0)
1161 aiagp->extfreeback = iagp->extfreeback;
1162
1163 if (back >= 0)
1164 biagp->extfreefwd = iagp->extfreefwd;
1165 else
1166 imap->im_agctl[agno].extfree =
1167 le32_to_cpu(iagp->extfreefwd);
1168
1169 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
1170
1171 IAGFREE_LOCK(imap);
1172 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1173 imap->im_freeiag = iagno;
1174 IAGFREE_UNLOCK(imap);
1175 }
1176 }
1177
1178 /* remove the iag from the ag inode free list if freeing
1179 * this extent causes the iag to have no free inodes.
1180 */
1181 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1182 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
1183 ciagp->inofreeback = iagp->inofreeback;
1184
1185 if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
1186 diagp->inofreefwd = iagp->inofreefwd;
1187 else
1188 imap->im_agctl[agno].inofree =
1189 le32_to_cpu(iagp->inofreefwd);
1190
1191 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
1192 }
1193
1194 /* update the inode extent address and working map
1195 * to reflect the free extent.
1196 * the permanent map should have been updated already
1197 * for the inode being freed.
1198 */
1199 if (iagp->pmap[extno] != 0) {
1200 jfs_error(ip->i_sb, "the pmap does not show inode free\n");
1201 }
1202 iagp->wmap[extno] = 0;
1203 PXDlength(&iagp->inoext[extno], 0);
1204 PXDaddress(&iagp->inoext[extno], 0);
1205
1206 /* update the free extent and free inode summary maps
1207 * to reflect the freed extent.
1208 * the inode summary map is marked to indicate no inodes
1209 * available for the freed extent.
1210 */
1211 sword = extno >> L2EXTSPERSUM;
1212 bitno = extno & (EXTSPERSUM - 1);
1213 mask = HIGHORDER >> bitno;
1214 iagp->inosmap[sword] |= cpu_to_le32(mask);
1215 iagp->extsmap[sword] &= cpu_to_le32(~mask);
1216
1217 /* update the number of free inodes and number of free extents
1218 * for the iag.
1219 */
1220 le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1));
1221 le32_add_cpu(&iagp->nfreeexts, 1);
1222
1223 /* update the number of free inodes and backed inodes
1224 * at the ag and inode map level.
1225 */
1226 imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
1227 imap->im_agctl[agno].numinos -= INOSPEREXT;
1228 atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
1229 atomic_sub(INOSPEREXT, &imap->im_numinos);
1230
1231 if (amp)
1232 write_metapage(amp);
1233 if (bmp)
1234 write_metapage(bmp);
1235 if (cmp)
1236 write_metapage(cmp);
1237 if (dmp)
1238 write_metapage(dmp);
1239
1240 /*
1241 * start transaction to update block allocation map
1242 * for the inode extent freed;
1243 *
1244 * N.B. AG_LOCK is released and iag will be released below, and
1245 * other thread may allocate inode from/reusing the ixad freed
1246 * BUT with new/different backing inode extent from the extent
1247 * to be freed by the transaction;
1248 */
1249 tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
1250 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
1251
1252 /* acquire tlock of the iag page of the freed ixad
1253 * to force the page NOHOMEOK (even though no data is
1254 * logged from the iag page) until NOREDOPAGE|FREEXTENT log
1255 * for the free of the extent is committed;
1256 * write FREEXTENT|NOREDOPAGE log record
1257 * N.B. linelock is overlaid as freed extent descriptor;
1258 */
1259 tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
1260 pxdlock = (struct pxd_lock *) & tlck->lock;
1261 pxdlock->flag = mlckFREEPXD;
1262 pxdlock->pxd = freepxd;
1263 pxdlock->index = 1;
1264
1265 write_metapage(mp);
1266
1267 iplist[0] = ipimap;
1268
1269 /*
1270 * logredo needs the IAG number and IAG extent index in order
1271 * to ensure that the IMap is consistent. The least disruptive
1272 * way to pass these values through to the transaction manager
1273 * is in the iplist array.
1274 *
1275 * It's not pretty, but it works.
1276 */
1277 iplist[1] = (struct inode *) (size_t)iagno;
1278 iplist[2] = (struct inode *) (size_t)extno;
1279
1280 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
1281
1282 txEnd(tid);
1283 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
1284
1285 /* unlock the AG inode map information */
1286 AG_UNLOCK(imap, agno);
1287
1288 return (0);
1289
1290 error_out:
1291 IREAD_UNLOCK(ipimap);
1292
1293 if (amp)
1294 release_metapage(amp);
1295 if (bmp)
1296 release_metapage(bmp);
1297 if (cmp)
1298 release_metapage(cmp);
1299 if (dmp)
1300 release_metapage(dmp);
1301
1302 AG_UNLOCK(imap, agno);
1303
1304 release_metapage(mp);
1305
1306 return (rc);
1307}
1308
1309/*
1310 * There are several places in the diAlloc* routines where we initialize
1311 * the inode.
1312 */
1313static inline void
1314diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
1315{
1316 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
1317
1318 ip->i_ino = (iagno << L2INOSPERIAG) + ino;
1319 jfs_ip->ixpxd = iagp->inoext[extno];
1320 jfs_ip->agstart = le64_to_cpu(iagp->agstart);
1321 jfs_ip->active_ag = -1;
1322}
1323
1324
1325/*
1326 * NAME: diAlloc(pip,dir,ip)
1327 *
1328 * FUNCTION: allocate a disk inode from the inode working map
1329 * for a fileset or aggregate.
1330 *
1331 * PARAMETERS:
1332 * pip - pointer to incore inode for the parent inode.
1333 * dir - 'true' if the new disk inode is for a directory.
1334 * ip - pointer to a new inode
1335 *
1336 * RETURN VALUES:
1337 * 0 - success.
1338 * -ENOSPC - insufficient disk resources.
1339 * -EIO - i/o error.
1340 */
1341int diAlloc(struct inode *pip, bool dir, struct inode *ip)
1342{
1343 int rc, ino, iagno, addext, extno, bitno, sword;
1344 int nwords, rem, i, agno;
1345 u32 mask, inosmap, extsmap;
1346 struct inode *ipimap;
1347 struct metapage *mp;
1348 ino_t inum;
1349 struct iag *iagp;
1350 struct inomap *imap;
1351
1352 /* get the pointers to the inode map inode and the
1353 * corresponding imap control structure.
1354 */
1355 ipimap = JFS_SBI(pip->i_sb)->ipimap;
1356 imap = JFS_IP(ipimap)->i_imap;
1357 JFS_IP(ip)->ipimap = ipimap;
1358 JFS_IP(ip)->fileset = FILESYSTEM_I;
1359
1360 /* for a directory, the allocation policy is to start
1361 * at the ag level using the preferred ag.
1362 */
1363 if (dir) {
1364 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1365 AG_LOCK(imap, agno);
1366 goto tryag;
1367 }
1368
1369 /* for files, the policy starts off by trying to allocate from
1370 * the same iag containing the parent disk inode:
1371 * try to allocate the new disk inode close to the parent disk
1372 * inode, using parent disk inode number + 1 as the allocation
1373 * hint. (we use a left-to-right policy to attempt to avoid
1374 * moving backward on the disk.) compute the hint within the
1375 * file system and the iag.
1376 */
1377
1378 /* get the ag number of this iag */
1379 agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
1380
1381 if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
1382 /*
1383 * There is an open file actively growing. We want to
1384 * allocate new inodes from a different ag to avoid
1385 * fragmentation problems.
1386 */
1387 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1388 AG_LOCK(imap, agno);
1389 goto tryag;
1390 }
1391
1392 inum = pip->i_ino + 1;
1393 ino = inum & (INOSPERIAG - 1);
1394
1395 /* back off the hint if it is outside of the iag */
1396 if (ino == 0)
1397 inum = pip->i_ino;
1398
1399 /* lock the AG inode map information */
1400 AG_LOCK(imap, agno);
1401
1402 /* Get read lock on imap inode */
1403 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
1404
1405 /* get the iag number and read the iag */
1406 iagno = INOTOIAG(inum);
1407 if ((rc = diIAGRead(imap, iagno, &mp))) {
1408 IREAD_UNLOCK(ipimap);
1409 AG_UNLOCK(imap, agno);
1410 return (rc);
1411 }
1412 iagp = (struct iag *) mp->data;
1413
1414 /* determine if new inode extent is allowed to be added to the iag.
1415 * new inode extent can be added to the iag if the ag
1416 * has less than 32 free disk inodes and the iag has free extents.
1417 */
1418 addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
1419
1420 /*
1421 * try to allocate from the IAG
1422 */
1423 /* check if the inode may be allocated from the iag
1424 * (i.e. the inode has free inodes or new extent can be added).
1425 */
1426 if (iagp->nfreeinos || addext) {
1427 /* determine the extent number of the hint.
1428 */
1429 extno = ino >> L2INOSPEREXT;
1430
1431 /* check if the extent containing the hint has backed
1432 * inodes. if so, try to allocate within this extent.
1433 */
1434 if (addressPXD(&iagp->inoext[extno])) {
1435 bitno = ino & (INOSPEREXT - 1);
1436 if ((bitno =
1437 diFindFree(le32_to_cpu(iagp->wmap[extno]),
1438 bitno))
1439 < INOSPEREXT) {
1440 ino = (extno << L2INOSPEREXT) + bitno;
1441
1442 /* a free inode (bit) was found within this
1443 * extent, so allocate it.
1444 */
1445 rc = diAllocBit(imap, iagp, ino);
1446 IREAD_UNLOCK(ipimap);
1447 if (rc) {
1448 assert(rc == -EIO);
1449 } else {
1450 /* set the results of the allocation
1451 * and write the iag.
1452 */
1453 diInitInode(ip, iagno, ino, extno,
1454 iagp);
1455 mark_metapage_dirty(mp);
1456 }
1457 release_metapage(mp);
1458
1459 /* free the AG lock and return.
1460 */
1461 AG_UNLOCK(imap, agno);
1462 return (rc);
1463 }
1464
1465 if (!addext)
1466 extno =
1467 (extno ==
1468 EXTSPERIAG - 1) ? 0 : extno + 1;
1469 }
1470
1471 /*
1472 * no free inodes within the extent containing the hint.
1473 *
1474 * try to allocate from the backed extents following
1475 * hint or, if appropriate (i.e. addext is true), allocate
1476 * an extent of free inodes at or following the extent
1477 * containing the hint.
1478 *
1479 * the free inode and free extent summary maps are used
1480 * here, so determine the starting summary map position
1481 * and the number of words we'll have to examine. again,
1482 * the approach is to allocate following the hint, so we
1483 * might have to initially ignore prior bits of the summary
1484 * map that represent extents prior to the extent containing
1485 * the hint and later revisit these bits.
1486 */
1487 bitno = extno & (EXTSPERSUM - 1);
1488 nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
1489 sword = extno >> L2EXTSPERSUM;
1490
1491 /* mask any prior bits for the starting words of the
1492 * summary map.
1493 */
1494 mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno));
1495 inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
1496 extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
1497
1498 /* scan the free inode and free extent summary maps for
1499 * free resources.
1500 */
1501 for (i = 0; i < nwords; i++) {
1502 /* check if this word of the free inode summary
1503 * map describes an extent with free inodes.
1504 */
1505 if (~inosmap) {
1506 /* an extent with free inodes has been
1507 * found. determine the extent number
1508 * and the inode number within the extent.
1509 */
1510 rem = diFindFree(inosmap, 0);
1511 extno = (sword << L2EXTSPERSUM) + rem;
1512 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
1513 0);
1514 if (rem >= INOSPEREXT) {
1515 IREAD_UNLOCK(ipimap);
1516 release_metapage(mp);
1517 AG_UNLOCK(imap, agno);
1518 jfs_error(ip->i_sb,
1519 "can't find free bit in wmap\n");
1520 return -EIO;
1521 }
1522
1523 /* determine the inode number within the
1524 * iag and allocate the inode from the
1525 * map.
1526 */
1527 ino = (extno << L2INOSPEREXT) + rem;
1528 rc = diAllocBit(imap, iagp, ino);
1529 IREAD_UNLOCK(ipimap);
1530 if (rc)
1531 assert(rc == -EIO);
1532 else {
1533 /* set the results of the allocation
1534 * and write the iag.
1535 */
1536 diInitInode(ip, iagno, ino, extno,
1537 iagp);
1538 mark_metapage_dirty(mp);
1539 }
1540 release_metapage(mp);
1541
1542 /* free the AG lock and return.
1543 */
1544 AG_UNLOCK(imap, agno);
1545 return (rc);
1546
1547 }
1548
1549 /* check if we may allocate an extent of free
1550 * inodes and whether this word of the free
1551 * extents summary map describes a free extent.
1552 */
1553 if (addext && ~extsmap) {
1554 /* a free extent has been found. determine
1555 * the extent number.
1556 */
1557 rem = diFindFree(extsmap, 0);
1558 extno = (sword << L2EXTSPERSUM) + rem;
1559
1560 /* allocate an extent of free inodes.
1561 */
1562 if ((rc = diNewExt(imap, iagp, extno))) {
1563 /* if there is no disk space for a
1564 * new extent, try to allocate the
1565 * disk inode from somewhere else.
1566 */
1567 if (rc == -ENOSPC)
1568 break;
1569
1570 assert(rc == -EIO);
1571 } else {
1572 /* set the results of the allocation
1573 * and write the iag.
1574 */
1575 diInitInode(ip, iagno,
1576 extno << L2INOSPEREXT,
1577 extno, iagp);
1578 mark_metapage_dirty(mp);
1579 }
1580 release_metapage(mp);
1581 /* free the imap inode & the AG lock & return.
1582 */
1583 IREAD_UNLOCK(ipimap);
1584 AG_UNLOCK(imap, agno);
1585 return (rc);
1586 }
1587
1588 /* move on to the next set of summary map words.
1589 */
1590 sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
1591 inosmap = le32_to_cpu(iagp->inosmap[sword]);
1592 extsmap = le32_to_cpu(iagp->extsmap[sword]);
1593 }
1594 }
1595 /* unlock imap inode */
1596 IREAD_UNLOCK(ipimap);
1597
1598 /* nothing doing in this iag, so release it. */
1599 release_metapage(mp);
1600
1601 tryag:
1602 /*
1603 * try to allocate anywhere within the same AG as the parent inode.
1604 */
1605 rc = diAllocAG(imap, agno, dir, ip);
1606
1607 AG_UNLOCK(imap, agno);
1608
1609 if (rc != -ENOSPC)
1610 return (rc);
1611
1612 /*
1613 * try to allocate in any AG.
1614 */
1615 return (diAllocAny(imap, agno, dir, ip));
1616}
1617
1618
1619/*
1620 * NAME: diAllocAG(imap,agno,dir,ip)
1621 *
1622 * FUNCTION: allocate a disk inode from the allocation group.
1623 *
1624 * this routine first determines if a new extent of free
1625 * inodes should be added for the allocation group, with
1626 * the current request satisfied from this extent. if this
1627 * is the case, an attempt will be made to do just that. if
1628 * this attempt fails or it has been determined that a new
1629 * extent should not be added, an attempt is made to satisfy
1630 * the request by allocating an existing (backed) free inode
1631 * from the allocation group.
1632 *
1633 * PRE CONDITION: Already have the AG lock for this AG.
1634 *
1635 * PARAMETERS:
1636 * imap - pointer to inode map control structure.
1637 * agno - allocation group to allocate from.
1638 * dir - 'true' if the new disk inode is for a directory.
1639 * ip - pointer to the new inode to be filled in on successful return
1640 * with the disk inode number allocated, its extent address
1641 * and the start of the ag.
1642 *
1643 * RETURN VALUES:
1644 * 0 - success.
1645 * -ENOSPC - insufficient disk resources.
1646 * -EIO - i/o error.
1647 */
1648static int
1649diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
1650{
1651 int rc, addext, numfree, numinos;
1652
1653 /* get the number of free and the number of backed disk
1654 * inodes currently within the ag.
1655 */
1656 numfree = imap->im_agctl[agno].numfree;
1657 numinos = imap->im_agctl[agno].numinos;
1658
1659 if (numfree > numinos) {
1660 jfs_error(ip->i_sb, "numfree > numinos\n");
1661 return -EIO;
1662 }
1663
1664 /* determine if we should allocate a new extent of free inodes
1665 * within the ag: for directory inodes, add a new extent
1666 * if there are a small number of free inodes or number of free
1667 * inodes is a small percentage of the number of backed inodes.
1668 */
1669 if (dir)
1670 addext = (numfree < 64 ||
1671 (numfree < 256
1672 && ((numfree * 100) / numinos) <= 20));
1673 else
1674 addext = (numfree == 0);
1675
1676 /*
1677 * try to allocate a new extent of free inodes.
1678 */
1679 if (addext) {
1680 /* if free space is not available for this new extent, try
1681 * below to allocate a free and existing (already backed)
1682 * inode from the ag.
1683 */
1684 if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
1685 return (rc);
1686 }
1687
1688 /*
1689 * try to allocate an existing free inode from the ag.
1690 */
1691 return (diAllocIno(imap, agno, ip));
1692}
1693
1694
1695/*
1696 * NAME: diAllocAny(imap,agno,dir,iap)
1697 *
1698 * FUNCTION: allocate a disk inode from any other allocation group.
1699 *
1700 * this routine is called when an allocation attempt within
1701 * the primary allocation group has failed. if attempts to
1702 * allocate an inode from any allocation group other than the
1703 * specified primary group.
1704 *
1705 * PARAMETERS:
1706 * imap - pointer to inode map control structure.
1707 * agno - primary allocation group (to avoid).
1708 * dir - 'true' if the new disk inode is for a directory.
1709 * ip - pointer to a new inode to be filled in on successful return
1710 * with the disk inode number allocated, its extent address
1711 * and the start of the ag.
1712 *
1713 * RETURN VALUES:
1714 * 0 - success.
1715 * -ENOSPC - insufficient disk resources.
1716 * -EIO - i/o error.
1717 */
1718static int
1719diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
1720{
1721 int ag, rc;
1722 int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;
1723
1724
1725 /* try to allocate from the ags following agno up to
1726 * the maximum ag number.
1727 */
1728 for (ag = agno + 1; ag <= maxag; ag++) {
1729 AG_LOCK(imap, ag);
1730
1731 rc = diAllocAG(imap, ag, dir, ip);
1732
1733 AG_UNLOCK(imap, ag);
1734
1735 if (rc != -ENOSPC)
1736 return (rc);
1737 }
1738
1739 /* try to allocate from the ags in front of agno.
1740 */
1741 for (ag = 0; ag < agno; ag++) {
1742 AG_LOCK(imap, ag);
1743
1744 rc = diAllocAG(imap, ag, dir, ip);
1745
1746 AG_UNLOCK(imap, ag);
1747
1748 if (rc != -ENOSPC)
1749 return (rc);
1750 }
1751
1752 /* no free disk inodes.
1753 */
1754 return -ENOSPC;
1755}
1756
1757
1758/*
1759 * NAME: diAllocIno(imap,agno,ip)
1760 *
1761 * FUNCTION: allocate a disk inode from the allocation group's free
1762 * inode list, returning an error if this free list is
1763 * empty (i.e. no iags on the list).
1764 *
1765 * allocation occurs from the first iag on the list using
1766 * the iag's free inode summary map to find the leftmost
1767 * free inode in the iag.
1768 *
1769 * PRE CONDITION: Already have AG lock for this AG.
1770 *
1771 * PARAMETERS:
1772 * imap - pointer to inode map control structure.
1773 * agno - allocation group.
1774 * ip - pointer to new inode to be filled in on successful return
1775 * with the disk inode number allocated, its extent address
1776 * and the start of the ag.
1777 *
1778 * RETURN VALUES:
1779 * 0 - success.
1780 * -ENOSPC - insufficient disk resources.
1781 * -EIO - i/o error.
1782 */
1783static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
1784{
1785 int iagno, ino, rc, rem, extno, sword;
1786 struct metapage *mp;
1787 struct iag *iagp;
1788
1789 /* check if there are iags on the ag's free inode list.
1790 */
1791 if ((iagno = imap->im_agctl[agno].inofree) < 0)
1792 return -ENOSPC;
1793
1794 /* obtain read lock on imap inode */
1795 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1796
1797 /* read the iag at the head of the list.
1798 */
1799 if ((rc = diIAGRead(imap, iagno, &mp))) {
1800 IREAD_UNLOCK(imap->im_ipimap);
1801 return (rc);
1802 }
1803 iagp = (struct iag *) mp->data;
1804
1805 /* better be free inodes in this iag if it is on the
1806 * list.
1807 */
1808 if (!iagp->nfreeinos) {
1809 IREAD_UNLOCK(imap->im_ipimap);
1810 release_metapage(mp);
1811 jfs_error(ip->i_sb, "nfreeinos = 0, but iag on freelist\n");
1812 return -EIO;
1813 }
1814
1815 /* scan the free inode summary map to find an extent
1816 * with free inodes.
1817 */
1818 for (sword = 0;; sword++) {
1819 if (sword >= SMAPSZ) {
1820 IREAD_UNLOCK(imap->im_ipimap);
1821 release_metapage(mp);
1822 jfs_error(ip->i_sb,
1823 "free inode not found in summary map\n");
1824 return -EIO;
1825 }
1826
1827 if (~iagp->inosmap[sword])
1828 break;
1829 }
1830
1831 /* found a extent with free inodes. determine
1832 * the extent number.
1833 */
1834 rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
1835 if (rem >= EXTSPERSUM) {
1836 IREAD_UNLOCK(imap->im_ipimap);
1837 release_metapage(mp);
1838 jfs_error(ip->i_sb, "no free extent found\n");
1839 return -EIO;
1840 }
1841 extno = (sword << L2EXTSPERSUM) + rem;
1842
1843 /* find the first free inode in the extent.
1844 */
1845 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
1846 if (rem >= INOSPEREXT) {
1847 IREAD_UNLOCK(imap->im_ipimap);
1848 release_metapage(mp);
1849 jfs_error(ip->i_sb, "free inode not found\n");
1850 return -EIO;
1851 }
1852
1853 /* compute the inode number within the iag.
1854 */
1855 ino = (extno << L2INOSPEREXT) + rem;
1856
1857 /* allocate the inode.
1858 */
1859 rc = diAllocBit(imap, iagp, ino);
1860 IREAD_UNLOCK(imap->im_ipimap);
1861 if (rc) {
1862 release_metapage(mp);
1863 return (rc);
1864 }
1865
1866 /* set the results of the allocation and write the iag.
1867 */
1868 diInitInode(ip, iagno, ino, extno, iagp);
1869 write_metapage(mp);
1870
1871 return (0);
1872}
1873
1874
1875/*
1876 * NAME: diAllocExt(imap,agno,ip)
1877 *
1878 * FUNCTION: add a new extent of free inodes to an iag, allocating
1879 * an inode from this extent to satisfy the current allocation
1880 * request.
1881 *
1882 * this routine first tries to find an existing iag with free
1883 * extents through the ag free extent list. if list is not
1884 * empty, the head of the list will be selected as the home
1885 * of the new extent of free inodes. otherwise (the list is
1886 * empty), a new iag will be allocated for the ag to contain
1887 * the extent.
1888 *
1889 * once an iag has been selected, the free extent summary map
1890 * is used to locate a free extent within the iag and diNewExt()
1891 * is called to initialize the extent, with initialization
1892 * including the allocation of the first inode of the extent
1893 * for the purpose of satisfying this request.
1894 *
1895 * PARAMETERS:
1896 * imap - pointer to inode map control structure.
1897 * agno - allocation group number.
1898 * ip - pointer to new inode to be filled in on successful return
1899 * with the disk inode number allocated, its extent address
1900 * and the start of the ag.
1901 *
1902 * RETURN VALUES:
1903 * 0 - success.
1904 * -ENOSPC - insufficient disk resources.
1905 * -EIO - i/o error.
1906 */
1907static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
1908{
1909 int rem, iagno, sword, extno, rc;
1910 struct metapage *mp;
1911 struct iag *iagp;
1912
1913 /* check if the ag has any iags with free extents. if not,
1914 * allocate a new iag for the ag.
1915 */
1916 if ((iagno = imap->im_agctl[agno].extfree) < 0) {
1917 /* If successful, diNewIAG will obtain the read lock on the
1918 * imap inode.
1919 */
1920 if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
1921 return (rc);
1922 }
1923 iagp = (struct iag *) mp->data;
1924
1925 /* set the ag number if this a brand new iag
1926 */
1927 iagp->agstart =
1928 cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
1929 } else {
1930 /* read the iag.
1931 */
1932 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1933 if ((rc = diIAGRead(imap, iagno, &mp))) {
1934 IREAD_UNLOCK(imap->im_ipimap);
1935 jfs_error(ip->i_sb, "error reading iag\n");
1936 return rc;
1937 }
1938 iagp = (struct iag *) mp->data;
1939 }
1940
1941 /* using the free extent summary map, find a free extent.
1942 */
1943 for (sword = 0;; sword++) {
1944 if (sword >= SMAPSZ) {
1945 release_metapage(mp);
1946 IREAD_UNLOCK(imap->im_ipimap);
1947 jfs_error(ip->i_sb, "free ext summary map not found\n");
1948 return -EIO;
1949 }
1950 if (~iagp->extsmap[sword])
1951 break;
1952 }
1953
1954 /* determine the extent number of the free extent.
1955 */
1956 rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
1957 if (rem >= EXTSPERSUM) {
1958 release_metapage(mp);
1959 IREAD_UNLOCK(imap->im_ipimap);
1960 jfs_error(ip->i_sb, "free extent not found\n");
1961 return -EIO;
1962 }
1963 extno = (sword << L2EXTSPERSUM) + rem;
1964
1965 /* initialize the new extent.
1966 */
1967 rc = diNewExt(imap, iagp, extno);
1968 IREAD_UNLOCK(imap->im_ipimap);
1969 if (rc) {
1970 /* something bad happened. if a new iag was allocated,
1971 * place it back on the inode map's iag free list, and
1972 * clear the ag number information.
1973 */
1974 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
1975 IAGFREE_LOCK(imap);
1976 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1977 imap->im_freeiag = iagno;
1978 IAGFREE_UNLOCK(imap);
1979 }
1980 write_metapage(mp);
1981 return (rc);
1982 }
1983
1984 /* set the results of the allocation and write the iag.
1985 */
1986 diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp);
1987
1988 write_metapage(mp);
1989
1990 return (0);
1991}
1992
1993
1994/*
1995 * NAME: diAllocBit(imap,iagp,ino)
1996 *
1997 * FUNCTION: allocate a backed inode from an iag.
1998 *
1999 * this routine performs the mechanics of allocating a
2000 * specified inode from a backed extent.
2001 *
2002 * if the inode to be allocated represents the last free
2003 * inode within the iag, the iag will be removed from the
2004 * ag free inode list.
2005 *
2006 * a careful update approach is used to provide consistency
2007 * in the face of updates to multiple buffers. under this
2008 * approach, all required buffers are obtained before making
2009 * any updates and are held all are updates are complete.
2010 *
2011 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2012 * this AG. Must have read lock on imap inode.
2013 *
2014 * PARAMETERS:
2015 * imap - pointer to inode map control structure.
2016 * iagp - pointer to iag.
2017 * ino - inode number to be allocated within the iag.
2018 *
2019 * RETURN VALUES:
2020 * 0 - success.
2021 * -ENOSPC - insufficient disk resources.
2022 * -EIO - i/o error.
2023 */
2024static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
2025{
2026 int extno, bitno, agno, sword, rc;
2027 struct metapage *amp = NULL, *bmp = NULL;
2028 struct iag *aiagp = NULL, *biagp = NULL;
2029 u32 mask;
2030
2031 /* check if this is the last free inode within the iag.
2032 * if so, it will have to be removed from the ag free
2033 * inode list, so get the iags preceding and following
2034 * it on the list.
2035 */
2036 if (iagp->nfreeinos == cpu_to_le32(1)) {
2037 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
2038 if ((rc =
2039 diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
2040 &)))
2041 return (rc);
2042 aiagp = (struct iag *) amp->data;
2043 }
2044
2045 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
2046 if ((rc =
2047 diIAGRead(imap,
2048 le32_to_cpu(iagp->inofreeback),
2049 &bmp))) {
2050 if (amp)
2051 release_metapage(amp);
2052 return (rc);
2053 }
2054 biagp = (struct iag *) bmp->data;
2055 }
2056 }
2057
2058 /* get the ag number, extent number, inode number within
2059 * the extent.
2060 */
2061 agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
2062 extno = ino >> L2INOSPEREXT;
2063 bitno = ino & (INOSPEREXT - 1);
2064
2065 /* compute the mask for setting the map.
2066 */
2067 mask = HIGHORDER >> bitno;
2068
2069 /* the inode should be free and backed.
2070 */
2071 if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
2072 ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
2073 (addressPXD(&iagp->inoext[extno]) == 0)) {
2074 if (amp)
2075 release_metapage(amp);
2076 if (bmp)
2077 release_metapage(bmp);
2078
2079 jfs_error(imap->im_ipimap->i_sb, "iag inconsistent\n");
2080 return -EIO;
2081 }
2082
2083 /* mark the inode as allocated in the working map.
2084 */
2085 iagp->wmap[extno] |= cpu_to_le32(mask);
2086
2087 /* check if all inodes within the extent are now
2088 * allocated. if so, update the free inode summary
2089 * map to reflect this.
2090 */
2091 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
2092 sword = extno >> L2EXTSPERSUM;
2093 bitno = extno & (EXTSPERSUM - 1);
2094 iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
2095 }
2096
2097 /* if this was the last free inode in the iag, remove the
2098 * iag from the ag free inode list.
2099 */
2100 if (iagp->nfreeinos == cpu_to_le32(1)) {
2101 if (amp) {
2102 aiagp->inofreeback = iagp->inofreeback;
2103 write_metapage(amp);
2104 }
2105
2106 if (bmp) {
2107 biagp->inofreefwd = iagp->inofreefwd;
2108 write_metapage(bmp);
2109 } else {
2110 imap->im_agctl[agno].inofree =
2111 le32_to_cpu(iagp->inofreefwd);
2112 }
2113 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2114 }
2115
2116 /* update the free inode count at the iag, ag, inode
2117 * map levels.
2118 */
2119 le32_add_cpu(&iagp->nfreeinos, -1);
2120 imap->im_agctl[agno].numfree -= 1;
2121 atomic_dec(&imap->im_numfree);
2122
2123 return (0);
2124}
2125
2126
2127/*
2128 * NAME: diNewExt(imap,iagp,extno)
2129 *
2130 * FUNCTION: initialize a new extent of inodes for an iag, allocating
2131 * the first inode of the extent for use for the current
2132 * allocation request.
2133 *
2134 * disk resources are allocated for the new extent of inodes
2135 * and the inodes themselves are initialized to reflect their
2136 * existence within the extent (i.e. their inode numbers and
2137 * inode extent addresses are set) and their initial state
2138 * (mode and link count are set to zero).
2139 *
2140 * if the iag is new, it is not yet on an ag extent free list
2141 * but will now be placed on this list.
2142 *
2143 * if the allocation of the new extent causes the iag to
2144 * have no free extent, the iag will be removed from the
2145 * ag extent free list.
2146 *
2147 * if the iag has no free backed inodes, it will be placed
2148 * on the ag free inode list, since the addition of the new
2149 * extent will now cause it to have free inodes.
2150 *
2151 * a careful update approach is used to provide consistency
2152 * (i.e. list consistency) in the face of updates to multiple
2153 * buffers. under this approach, all required buffers are
2154 * obtained before making any updates and are held until all
2155 * updates are complete.
2156 *
2157 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2158 * this AG. Must have read lock on imap inode.
2159 *
2160 * PARAMETERS:
2161 * imap - pointer to inode map control structure.
2162 * iagp - pointer to iag.
2163 * extno - extent number.
2164 *
2165 * RETURN VALUES:
2166 * 0 - success.
2167 * -ENOSPC - insufficient disk resources.
2168 * -EIO - i/o error.
2169 */
2170static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
2171{
2172 int agno, iagno, fwd, back, freei = 0, sword, rc;
2173 struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
2174 struct metapage *amp, *bmp, *cmp, *dmp;
2175 struct inode *ipimap;
2176 s64 blkno, hint;
2177 int i, j;
2178 u32 mask;
2179 ino_t ino;
2180 struct dinode *dp;
2181 struct jfs_sb_info *sbi;
2182
2183 /* better have free extents.
2184 */
2185 if (!iagp->nfreeexts) {
2186 jfs_error(imap->im_ipimap->i_sb, "no free extents\n");
2187 return -EIO;
2188 }
2189
2190 /* get the inode map inode.
2191 */
2192 ipimap = imap->im_ipimap;
2193 sbi = JFS_SBI(ipimap->i_sb);
2194
2195 amp = bmp = cmp = NULL;
2196
2197 /* get the ag and iag numbers for this iag.
2198 */
2199 agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
2200 iagno = le32_to_cpu(iagp->iagnum);
2201
2202 /* check if this is the last free extent within the
2203 * iag. if so, the iag must be removed from the ag
2204 * free extent list, so get the iags preceding and
2205 * following the iag on this list.
2206 */
2207 if (iagp->nfreeexts == cpu_to_le32(1)) {
2208 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
2209 if ((rc = diIAGRead(imap, fwd, &)))
2210 return (rc);
2211 aiagp = (struct iag *) amp->data;
2212 }
2213
2214 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
2215 if ((rc = diIAGRead(imap, back, &bmp)))
2216 goto error_out;
2217 biagp = (struct iag *) bmp->data;
2218 }
2219 } else {
2220 /* the iag has free extents. if all extents are free
2221 * (as is the case for a newly allocated iag), the iag
2222 * must be added to the ag free extent list, so get
2223 * the iag at the head of the list in preparation for
2224 * adding this iag to this list.
2225 */
2226 fwd = back = -1;
2227 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2228 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
2229 if ((rc = diIAGRead(imap, fwd, &)))
2230 goto error_out;
2231 aiagp = (struct iag *) amp->data;
2232 }
2233 }
2234 }
2235
2236 /* check if the iag has no free inodes. if so, the iag
2237 * will have to be added to the ag free inode list, so get
2238 * the iag at the head of the list in preparation for
2239 * adding this iag to this list. in doing this, we must
2240 * check if we already have the iag at the head of
2241 * the list in hand.
2242 */
2243 if (iagp->nfreeinos == 0) {
2244 freei = imap->im_agctl[agno].inofree;
2245
2246 if (freei >= 0) {
2247 if (freei == fwd) {
2248 ciagp = aiagp;
2249 } else if (freei == back) {
2250 ciagp = biagp;
2251 } else {
2252 if ((rc = diIAGRead(imap, freei, &cmp)))
2253 goto error_out;
2254 ciagp = (struct iag *) cmp->data;
2255 }
2256 if (ciagp == NULL) {
2257 jfs_error(imap->im_ipimap->i_sb,
2258 "ciagp == NULL\n");
2259 rc = -EIO;
2260 goto error_out;
2261 }
2262 }
2263 }
2264
2265 /* allocate disk space for the inode extent.
2266 */
2267 if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0))
2268 hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
2269 else
2270 hint = addressPXD(&iagp->inoext[extno - 1]) +
2271 lengthPXD(&iagp->inoext[extno - 1]) - 1;
2272
2273 if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno)))
2274 goto error_out;
2275
2276 /* compute the inode number of the first inode within the
2277 * extent.
2278 */
2279 ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
2280
2281 /* initialize the inodes within the newly allocated extent a
2282 * page at a time.
2283 */
2284 for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
2285 /* get a buffer for this page of disk inodes.
2286 */
2287 dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
2288 if (dmp == NULL) {
2289 rc = -EIO;
2290 goto error_out;
2291 }
2292 dp = (struct dinode *) dmp->data;
2293
2294 /* initialize the inode number, mode, link count and
2295 * inode extent address.
2296 */
2297 for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
2298 dp->di_inostamp = cpu_to_le32(sbi->inostamp);
2299 dp->di_number = cpu_to_le32(ino);
2300 dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
2301 dp->di_mode = 0;
2302 dp->di_nlink = 0;
2303 PXDaddress(&(dp->di_ixpxd), blkno);
2304 PXDlength(&(dp->di_ixpxd), imap->im_nbperiext);
2305 }
2306 write_metapage(dmp);
2307 }
2308
2309 /* if this is the last free extent within the iag, remove the
2310 * iag from the ag free extent list.
2311 */
2312 if (iagp->nfreeexts == cpu_to_le32(1)) {
2313 if (fwd >= 0)
2314 aiagp->extfreeback = iagp->extfreeback;
2315
2316 if (back >= 0)
2317 biagp->extfreefwd = iagp->extfreefwd;
2318 else
2319 imap->im_agctl[agno].extfree =
2320 le32_to_cpu(iagp->extfreefwd);
2321
2322 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2323 } else {
2324 /* if the iag has all free extents (newly allocated iag),
2325 * add the iag to the ag free extent list.
2326 */
2327 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2328 if (fwd >= 0)
2329 aiagp->extfreeback = cpu_to_le32(iagno);
2330
2331 iagp->extfreefwd = cpu_to_le32(fwd);
2332 iagp->extfreeback = cpu_to_le32(-1);
2333 imap->im_agctl[agno].extfree = iagno;
2334 }
2335 }
2336
2337 /* if the iag has no free inodes, add the iag to the
2338 * ag free inode list.
2339 */
2340 if (iagp->nfreeinos == 0) {
2341 if (freei >= 0)
2342 ciagp->inofreeback = cpu_to_le32(iagno);
2343
2344 iagp->inofreefwd =
2345 cpu_to_le32(imap->im_agctl[agno].inofree);
2346 iagp->inofreeback = cpu_to_le32(-1);
2347 imap->im_agctl[agno].inofree = iagno;
2348 }
2349
2350 /* initialize the extent descriptor of the extent. */
2351 PXDlength(&iagp->inoext[extno], imap->im_nbperiext);
2352 PXDaddress(&iagp->inoext[extno], blkno);
2353
2354 /* initialize the working and persistent map of the extent.
2355 * the working map will be initialized such that
2356 * it indicates the first inode of the extent is allocated.
2357 */
2358 iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
2359 iagp->pmap[extno] = 0;
2360
2361 /* update the free inode and free extent summary maps
2362 * for the extent to indicate the extent has free inodes
2363 * and no longer represents a free extent.
2364 */
2365 sword = extno >> L2EXTSPERSUM;
2366 mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
2367 iagp->extsmap[sword] |= cpu_to_le32(mask);
2368 iagp->inosmap[sword] &= cpu_to_le32(~mask);
2369
2370 /* update the free inode and free extent counts for the
2371 * iag.
2372 */
2373 le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1));
2374 le32_add_cpu(&iagp->nfreeexts, -1);
2375
2376 /* update the free and backed inode counts for the ag.
2377 */
2378 imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
2379 imap->im_agctl[agno].numinos += INOSPEREXT;
2380
2381 /* update the free and backed inode counts for the inode map.
2382 */
2383 atomic_add(INOSPEREXT - 1, &imap->im_numfree);
2384 atomic_add(INOSPEREXT, &imap->im_numinos);
2385
2386 /* write the iags.
2387 */
2388 if (amp)
2389 write_metapage(amp);
2390 if (bmp)
2391 write_metapage(bmp);
2392 if (cmp)
2393 write_metapage(cmp);
2394
2395 return (0);
2396
2397 error_out:
2398
2399 /* release the iags.
2400 */
2401 if (amp)
2402 release_metapage(amp);
2403 if (bmp)
2404 release_metapage(bmp);
2405 if (cmp)
2406 release_metapage(cmp);
2407
2408 return (rc);
2409}
2410
2411
2412/*
2413 * NAME: diNewIAG(imap,iagnop,agno)
2414 *
2415 * FUNCTION: allocate a new iag for an allocation group.
2416 *
2417 * first tries to allocate the iag from the inode map
2418 * iagfree list:
2419 * if the list has free iags, the head of the list is removed
2420 * and returned to satisfy the request.
2421 * if the inode map's iag free list is empty, the inode map
2422 * is extended to hold a new iag. this new iag is initialized
2423 * and returned to satisfy the request.
2424 *
2425 * PARAMETERS:
2426 * imap - pointer to inode map control structure.
2427 * iagnop - pointer to an iag number set with the number of the
2428 * newly allocated iag upon successful return.
2429 * agno - allocation group number.
2430 * bpp - Buffer pointer to be filled in with new IAG's buffer
2431 *
2432 * RETURN VALUES:
2433 * 0 - success.
2434 * -ENOSPC - insufficient disk resources.
2435 * -EIO - i/o error.
2436 *
2437 * serialization:
2438 * AG lock held on entry/exit;
2439 * write lock on the map is held inside;
2440 * read lock on the map is held on successful completion;
2441 *
2442 * note: new iag transaction:
2443 * . synchronously write iag;
2444 * . write log of xtree and inode of imap;
2445 * . commit;
2446 * . synchronous write of xtree (right to left, bottom to top);
2447 * . at start of logredo(): init in-memory imap with one additional iag page;
2448 * . at end of logredo(): re-read imap inode to determine
2449 * new imap size;
2450 */
2451static int
2452diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
2453{
2454 int rc;
2455 int iagno, i, xlen;
2456 struct inode *ipimap;
2457 struct super_block *sb;
2458 struct jfs_sb_info *sbi;
2459 struct metapage *mp;
2460 struct iag *iagp;
2461 s64 xaddr = 0;
2462 s64 blkno;
2463 tid_t tid;
2464 struct inode *iplist[1];
2465
2466 /* pick up pointers to the inode map and mount inodes */
2467 ipimap = imap->im_ipimap;
2468 sb = ipimap->i_sb;
2469 sbi = JFS_SBI(sb);
2470
2471 /* acquire the free iag lock */
2472 IAGFREE_LOCK(imap);
2473
2474 /* if there are any iags on the inode map free iag list,
2475 * allocate the iag from the head of the list.
2476 */
2477 if (imap->im_freeiag >= 0) {
2478 /* pick up the iag number at the head of the list */
2479 iagno = imap->im_freeiag;
2480
2481 /* determine the logical block number of the iag */
2482 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2483 } else {
2484 /* no free iags. the inode map will have to be extented
2485 * to include a new iag.
2486 */
2487
2488 /* acquire inode map lock */
2489 IWRITE_LOCK(ipimap, RDWRLOCK_IMAP);
2490
2491 if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
2492 IWRITE_UNLOCK(ipimap);
2493 IAGFREE_UNLOCK(imap);
2494 jfs_error(imap->im_ipimap->i_sb,
2495 "ipimap->i_size is wrong\n");
2496 return -EIO;
2497 }
2498
2499
2500 /* get the next available iag number */
2501 iagno = imap->im_nextiag;
2502
2503 /* make sure that we have not exceeded the maximum inode
2504 * number limit.
2505 */
2506 if (iagno > (MAXIAGS - 1)) {
2507 /* release the inode map lock */
2508 IWRITE_UNLOCK(ipimap);
2509
2510 rc = -ENOSPC;
2511 goto out;
2512 }
2513
2514 /*
2515 * synchronously append new iag page.
2516 */
2517 /* determine the logical address of iag page to append */
2518 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2519
2520 /* Allocate extent for new iag page */
2521 xlen = sbi->nbperpage;
2522 if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) {
2523 /* release the inode map lock */
2524 IWRITE_UNLOCK(ipimap);
2525
2526 goto out;
2527 }
2528
2529 /*
2530 * start transaction of update of the inode map
2531 * addressing structure pointing to the new iag page;
2532 */
2533 tid = txBegin(sb, COMMIT_FORCE);
2534 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
2535
2536 /* update the inode map addressing structure to point to it */
2537 if ((rc =
2538 xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) {
2539 txEnd(tid);
2540 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2541 /* Free the blocks allocated for the iag since it was
2542 * not successfully added to the inode map
2543 */
2544 dbFree(ipimap, xaddr, (s64) xlen);
2545
2546 /* release the inode map lock */
2547 IWRITE_UNLOCK(ipimap);
2548
2549 goto out;
2550 }
2551
2552 /* update the inode map's inode to reflect the extension */
2553 ipimap->i_size += PSIZE;
2554 inode_add_bytes(ipimap, PSIZE);
2555
2556 /* assign a buffer for the page */
2557 mp = get_metapage(ipimap, blkno, PSIZE, 0);
2558 if (!mp) {
2559 /*
2560 * This is very unlikely since we just created the
2561 * extent, but let's try to handle it correctly
2562 */
2563 xtTruncate(tid, ipimap, ipimap->i_size - PSIZE,
2564 COMMIT_PWMAP);
2565
2566 txAbort(tid, 0);
2567 txEnd(tid);
2568 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2569
2570 /* release the inode map lock */
2571 IWRITE_UNLOCK(ipimap);
2572
2573 rc = -EIO;
2574 goto out;
2575 }
2576 iagp = (struct iag *) mp->data;
2577
2578 /* init the iag */
2579 memset(iagp, 0, sizeof(struct iag));
2580 iagp->iagnum = cpu_to_le32(iagno);
2581 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2582 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2583 iagp->iagfree = cpu_to_le32(-1);
2584 iagp->nfreeinos = 0;
2585 iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
2586
2587 /* initialize the free inode summary map (free extent
2588 * summary map initialization handled by bzero).
2589 */
2590 for (i = 0; i < SMAPSZ; i++)
2591 iagp->inosmap[i] = cpu_to_le32(ONES);
2592
2593 /*
2594 * Write and sync the metapage
2595 */
2596 flush_metapage(mp);
2597
2598 /*
2599 * txCommit(COMMIT_FORCE) will synchronously write address
2600 * index pages and inode after commit in careful update order
2601 * of address index pages (right to left, bottom up);
2602 */
2603 iplist[0] = ipimap;
2604 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
2605
2606 txEnd(tid);
2607 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2608
2609 duplicateIXtree(sb, blkno, xlen, &xaddr);
2610
2611 /* update the next available iag number */
2612 imap->im_nextiag += 1;
2613
2614 /* Add the iag to the iag free list so we don't lose the iag
2615 * if a failure happens now.
2616 */
2617 imap->im_freeiag = iagno;
2618
2619 /* Until we have logredo working, we want the imap inode &
2620 * control page to be up to date.
2621 */
2622 diSync(ipimap);
2623
2624 /* release the inode map lock */
2625 IWRITE_UNLOCK(ipimap);
2626 }
2627
2628 /* obtain read lock on map */
2629 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2630
2631 /* read the iag */
2632 if ((rc = diIAGRead(imap, iagno, &mp))) {
2633 IREAD_UNLOCK(ipimap);
2634 rc = -EIO;
2635 goto out;
2636 }
2637 iagp = (struct iag *) mp->data;
2638
2639 /* remove the iag from the iag free list */
2640 imap->im_freeiag = le32_to_cpu(iagp->iagfree);
2641 iagp->iagfree = cpu_to_le32(-1);
2642
2643 /* set the return iag number and buffer pointer */
2644 *iagnop = iagno;
2645 *mpp = mp;
2646
2647 out:
2648 /* release the iag free lock */
2649 IAGFREE_UNLOCK(imap);
2650
2651 return (rc);
2652}
2653
2654/*
2655 * NAME: diIAGRead()
2656 *
2657 * FUNCTION: get the buffer for the specified iag within a fileset
2658 * or aggregate inode map.
2659 *
2660 * PARAMETERS:
2661 * imap - pointer to inode map control structure.
2662 * iagno - iag number.
2663 * bpp - point to buffer pointer to be filled in on successful
2664 * exit.
2665 *
2666 * SERIALIZATION:
2667 * must have read lock on imap inode
2668 * (When called by diExtendFS, the filesystem is quiesced, therefore
2669 * the read lock is unnecessary.)
2670 *
2671 * RETURN VALUES:
2672 * 0 - success.
2673 * -EIO - i/o error.
2674 */
2675static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
2676{
2677 struct inode *ipimap = imap->im_ipimap;
2678 s64 blkno;
2679
2680 /* compute the logical block number of the iag. */
2681 blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
2682
2683 /* read the iag. */
2684 *mpp = read_metapage(ipimap, blkno, PSIZE, 0);
2685 if (*mpp == NULL) {
2686 return -EIO;
2687 }
2688
2689 return (0);
2690}
2691
2692/*
2693 * NAME: diFindFree()
2694 *
2695 * FUNCTION: find the first free bit in a word starting at
2696 * the specified bit position.
2697 *
2698 * PARAMETERS:
2699 * word - word to be examined.
2700 * start - starting bit position.
2701 *
2702 * RETURN VALUES:
2703 * bit position of first free bit in the word or 32 if
2704 * no free bits were found.
2705 */
2706static int diFindFree(u32 word, int start)
2707{
2708 int bitno;
2709 assert(start < 32);
2710 /* scan the word for the first free bit. */
2711 for (word <<= start, bitno = start; bitno < 32;
2712 bitno++, word <<= 1) {
2713 if ((word & HIGHORDER) == 0)
2714 break;
2715 }
2716 return (bitno);
2717}
2718
2719/*
2720 * NAME: diUpdatePMap()
2721 *
2722 * FUNCTION: Update the persistent map in an IAG for the allocation or
2723 * freeing of the specified inode.
2724 *
2725 * PRE CONDITIONS: Working map has already been updated for allocate.
2726 *
2727 * PARAMETERS:
2728 * ipimap - Incore inode map inode
2729 * inum - Number of inode to mark in permanent map
2730 * is_free - If 'true' indicates inode should be marked freed, otherwise
2731 * indicates inode should be marked allocated.
2732 *
2733 * RETURN VALUES:
2734 * 0 for success
2735 */
2736int
2737diUpdatePMap(struct inode *ipimap,
2738 unsigned long inum, bool is_free, struct tblock * tblk)
2739{
2740 int rc;
2741 struct iag *iagp;
2742 struct metapage *mp;
2743 int iagno, ino, extno, bitno;
2744 struct inomap *imap;
2745 u32 mask;
2746 struct jfs_log *log;
2747 int lsn, difft, diffp;
2748 unsigned long flags;
2749
2750 imap = JFS_IP(ipimap)->i_imap;
2751 /* get the iag number containing the inode */
2752 iagno = INOTOIAG(inum);
2753 /* make sure that the iag is contained within the map */
2754 if (iagno >= imap->im_nextiag) {
2755 jfs_error(ipimap->i_sb, "the iag is outside the map\n");
2756 return -EIO;
2757 }
2758 /* read the iag */
2759 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2760 rc = diIAGRead(imap, iagno, &mp);
2761 IREAD_UNLOCK(ipimap);
2762 if (rc)
2763 return (rc);
2764 metapage_wait_for_io(mp);
2765 iagp = (struct iag *) mp->data;
2766 /* get the inode number and extent number of the inode within
2767 * the iag and the inode number within the extent.
2768 */
2769 ino = inum & (INOSPERIAG - 1);
2770 extno = ino >> L2INOSPEREXT;
2771 bitno = ino & (INOSPEREXT - 1);
2772 mask = HIGHORDER >> bitno;
2773 /*
2774 * mark the inode free in persistent map:
2775 */
2776 if (is_free) {
2777 /* The inode should have been allocated both in working
2778 * map and in persistent map;
2779 * the inode will be freed from working map at the release
2780 * of last reference release;
2781 */
2782 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2783 jfs_error(ipimap->i_sb,
2784 "inode %ld not marked as allocated in wmap!\n",
2785 inum);
2786 }
2787 if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
2788 jfs_error(ipimap->i_sb,
2789 "inode %ld not marked as allocated in pmap!\n",
2790 inum);
2791 }
2792 /* update the bitmap for the extent of the freed inode */
2793 iagp->pmap[extno] &= cpu_to_le32(~mask);
2794 }
2795 /*
2796 * mark the inode allocated in persistent map:
2797 */
2798 else {
2799 /* The inode should be already allocated in the working map
2800 * and should be free in persistent map;
2801 */
2802 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2803 release_metapage(mp);
2804 jfs_error(ipimap->i_sb,
2805 "the inode is not allocated in the working map\n");
2806 return -EIO;
2807 }
2808 if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
2809 release_metapage(mp);
2810 jfs_error(ipimap->i_sb,
2811 "the inode is not free in the persistent map\n");
2812 return -EIO;
2813 }
2814 /* update the bitmap for the extent of the allocated inode */
2815 iagp->pmap[extno] |= cpu_to_le32(mask);
2816 }
2817 /*
2818 * update iag lsn
2819 */
2820 lsn = tblk->lsn;
2821 log = JFS_SBI(tblk->sb)->log;
2822 LOGSYNC_LOCK(log, flags);
2823 if (mp->lsn != 0) {
2824 /* inherit older/smaller lsn */
2825 logdiff(difft, lsn, log);
2826 logdiff(diffp, mp->lsn, log);
2827 if (difft < diffp) {
2828 mp->lsn = lsn;
2829 /* move mp after tblock in logsync list */
2830 list_move(&mp->synclist, &tblk->synclist);
2831 }
2832 /* inherit younger/larger clsn */
2833 assert(mp->clsn);
2834 logdiff(difft, tblk->clsn, log);
2835 logdiff(diffp, mp->clsn, log);
2836 if (difft > diffp)
2837 mp->clsn = tblk->clsn;
2838 } else {
2839 mp->log = log;
2840 mp->lsn = lsn;
2841 /* insert mp after tblock in logsync list */
2842 log->count++;
2843 list_add(&mp->synclist, &tblk->synclist);
2844 mp->clsn = tblk->clsn;
2845 }
2846 LOGSYNC_UNLOCK(log, flags);
2847 write_metapage(mp);
2848 return (0);
2849}
2850
2851/*
2852 * diExtendFS()
2853 *
2854 * function: update imap for extendfs();
2855 *
2856 * note: AG size has been increased s.t. each k old contiguous AGs are
2857 * coalesced into a new AG;
2858 */
2859int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
2860{
2861 int rc, rcx = 0;
2862 struct inomap *imap = JFS_IP(ipimap)->i_imap;
2863 struct iag *iagp = NULL, *hiagp = NULL;
2864 struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap;
2865 struct metapage *bp, *hbp;
2866 int i, n, head;
2867 int numinos, xnuminos = 0, xnumfree = 0;
2868 s64 agstart;
2869
2870 jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
2871 imap->im_nextiag, atomic_read(&imap->im_numinos),
2872 atomic_read(&imap->im_numfree));
2873
2874 /*
2875 * reconstruct imap
2876 *
2877 * coalesce contiguous k (newAGSize/oldAGSize) AGs;
2878 * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
2879 * note: new AG size = old AG size * (2**x).
2880 */
2881
2882 /* init per AG control information im_agctl[] */
2883 for (i = 0; i < MAXAG; i++) {
2884 imap->im_agctl[i].inofree = -1;
2885 imap->im_agctl[i].extfree = -1;
2886 imap->im_agctl[i].numinos = 0; /* number of backed inodes */
2887 imap->im_agctl[i].numfree = 0; /* number of free backed inodes */
2888 }
2889
2890 /*
2891 * process each iag page of the map.
2892 *
2893 * rebuild AG Free Inode List, AG Free Inode Extent List;
2894 */
2895 for (i = 0; i < imap->im_nextiag; i++) {
2896 if ((rc = diIAGRead(imap, i, &bp))) {
2897 rcx = rc;
2898 continue;
2899 }
2900 iagp = (struct iag *) bp->data;
2901 if (le32_to_cpu(iagp->iagnum) != i) {
2902 release_metapage(bp);
2903 jfs_error(ipimap->i_sb, "unexpected value of iagnum\n");
2904 return -EIO;
2905 }
2906
2907 /* leave free iag in the free iag list */
2908 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2909 release_metapage(bp);
2910 continue;
2911 }
2912
2913 agstart = le64_to_cpu(iagp->agstart);
2914 n = agstart >> mp->db_agl2size;
2915 iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
2916
2917 /* compute backed inodes */
2918 numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
2919 << L2INOSPEREXT;
2920 if (numinos > 0) {
2921 /* merge AG backed inodes */
2922 imap->im_agctl[n].numinos += numinos;
2923 xnuminos += numinos;
2924 }
2925
2926 /* if any backed free inodes, insert at AG free inode list */
2927 if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
2928 if ((head = imap->im_agctl[n].inofree) == -1) {
2929 iagp->inofreefwd = cpu_to_le32(-1);
2930 iagp->inofreeback = cpu_to_le32(-1);
2931 } else {
2932 if ((rc = diIAGRead(imap, head, &hbp))) {
2933 rcx = rc;
2934 goto nextiag;
2935 }
2936 hiagp = (struct iag *) hbp->data;
2937 hiagp->inofreeback = iagp->iagnum;
2938 iagp->inofreefwd = cpu_to_le32(head);
2939 iagp->inofreeback = cpu_to_le32(-1);
2940 write_metapage(hbp);
2941 }
2942
2943 imap->im_agctl[n].inofree =
2944 le32_to_cpu(iagp->iagnum);
2945
2946 /* merge AG backed free inodes */
2947 imap->im_agctl[n].numfree +=
2948 le32_to_cpu(iagp->nfreeinos);
2949 xnumfree += le32_to_cpu(iagp->nfreeinos);
2950 }
2951
2952 /* if any free extents, insert at AG free extent list */
2953 if (le32_to_cpu(iagp->nfreeexts) > 0) {
2954 if ((head = imap->im_agctl[n].extfree) == -1) {
2955 iagp->extfreefwd = cpu_to_le32(-1);
2956 iagp->extfreeback = cpu_to_le32(-1);
2957 } else {
2958 if ((rc = diIAGRead(imap, head, &hbp))) {
2959 rcx = rc;
2960 goto nextiag;
2961 }
2962 hiagp = (struct iag *) hbp->data;
2963 hiagp->extfreeback = iagp->iagnum;
2964 iagp->extfreefwd = cpu_to_le32(head);
2965 iagp->extfreeback = cpu_to_le32(-1);
2966 write_metapage(hbp);
2967 }
2968
2969 imap->im_agctl[n].extfree =
2970 le32_to_cpu(iagp->iagnum);
2971 }
2972
2973 nextiag:
2974 write_metapage(bp);
2975 }
2976
2977 if (xnuminos != atomic_read(&imap->im_numinos) ||
2978 xnumfree != atomic_read(&imap->im_numfree)) {
2979 jfs_error(ipimap->i_sb, "numinos or numfree incorrect\n");
2980 return -EIO;
2981 }
2982
2983 return rcx;
2984}
2985
2986
2987/*
2988 * duplicateIXtree()
2989 *
2990 * serialization: IWRITE_LOCK held on entry/exit
2991 *
2992 * note: shadow page with regular inode (rel.2);
2993 */
2994static void duplicateIXtree(struct super_block *sb, s64 blkno,
2995 int xlen, s64 *xaddr)
2996{
2997 struct jfs_superblock *j_sb;
2998 struct buffer_head *bh;
2999 struct inode *ip;
3000 tid_t tid;
3001
3002 /* if AIT2 ipmap2 is bad, do not try to update it */
3003 if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */
3004 return;
3005 ip = diReadSpecial(sb, FILESYSTEM_I, 1);
3006 if (ip == NULL) {
3007 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3008 if (readSuper(sb, &bh))
3009 return;
3010 j_sb = (struct jfs_superblock *)bh->b_data;
3011 j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
3012
3013 mark_buffer_dirty(bh);
3014 sync_dirty_buffer(bh);
3015 brelse(bh);
3016 return;
3017 }
3018
3019 /* start transaction */
3020 tid = txBegin(sb, COMMIT_FORCE);
3021 /* update the inode map addressing structure to point to it */
3022 if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) {
3023 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3024 txAbort(tid, 1);
3025 goto cleanup;
3026
3027 }
3028 /* update the inode map's inode to reflect the extension */
3029 ip->i_size += PSIZE;
3030 inode_add_bytes(ip, PSIZE);
3031 txCommit(tid, 1, &ip, COMMIT_FORCE);
3032 cleanup:
3033 txEnd(tid);
3034 diFreeSpecial(ip);
3035}
3036
3037/*
3038 * NAME: copy_from_dinode()
3039 *
3040 * FUNCTION: Copies inode info from disk inode to in-memory inode
3041 *
3042 * RETURN VALUES:
3043 * 0 - success
3044 * -ENOMEM - insufficient memory
3045 */
3046static int copy_from_dinode(struct dinode * dip, struct inode *ip)
3047{
3048 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3049 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3050
3051 jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
3052 jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
3053 jfs_set_inode_flags(ip);
3054
3055 ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
3056 if (sbi->umask != -1) {
3057 ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask);
3058 /* For directories, add x permission if r is allowed by umask */
3059 if (S_ISDIR(ip->i_mode)) {
3060 if (ip->i_mode & 0400)
3061 ip->i_mode |= 0100;
3062 if (ip->i_mode & 0040)
3063 ip->i_mode |= 0010;
3064 if (ip->i_mode & 0004)
3065 ip->i_mode |= 0001;
3066 }
3067 }
3068 set_nlink(ip, le32_to_cpu(dip->di_nlink));
3069
3070 jfs_ip->saved_uid = make_kuid(&init_user_ns, le32_to_cpu(dip->di_uid));
3071 if (!uid_valid(sbi->uid))
3072 ip->i_uid = jfs_ip->saved_uid;
3073 else {
3074 ip->i_uid = sbi->uid;
3075 }
3076
3077 jfs_ip->saved_gid = make_kgid(&init_user_ns, le32_to_cpu(dip->di_gid));
3078 if (!gid_valid(sbi->gid))
3079 ip->i_gid = jfs_ip->saved_gid;
3080 else {
3081 ip->i_gid = sbi->gid;
3082 }
3083
3084 ip->i_size = le64_to_cpu(dip->di_size);
3085 ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec);
3086 ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec);
3087 ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec);
3088 ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec);
3089 ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec);
3090 ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec);
3091 ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
3092 ip->i_generation = le32_to_cpu(dip->di_gen);
3093
3094 jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */
3095 jfs_ip->acl = dip->di_acl; /* as are dxd's */
3096 jfs_ip->ea = dip->di_ea;
3097 jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
3098 jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
3099 jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
3100
3101 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
3102 jfs_ip->dev = le32_to_cpu(dip->di_rdev);
3103 ip->i_rdev = new_decode_dev(jfs_ip->dev);
3104 }
3105
3106 if (S_ISDIR(ip->i_mode)) {
3107 memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384);
3108 } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
3109 memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
3110 } else
3111 memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
3112
3113 /* Zero the in-memory-only stuff */
3114 jfs_ip->cflag = 0;
3115 jfs_ip->btindex = 0;
3116 jfs_ip->btorder = 0;
3117 jfs_ip->bxflag = 0;
3118 jfs_ip->blid = 0;
3119 jfs_ip->atlhead = 0;
3120 jfs_ip->atltail = 0;
3121 jfs_ip->xtlid = 0;
3122 return (0);
3123}
3124
3125/*
3126 * NAME: copy_to_dinode()
3127 *
3128 * FUNCTION: Copies inode info from in-memory inode to disk inode
3129 */
3130static void copy_to_dinode(struct dinode * dip, struct inode *ip)
3131{
3132 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3133 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3134
3135 dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
3136 dip->di_inostamp = cpu_to_le32(sbi->inostamp);
3137 dip->di_number = cpu_to_le32(ip->i_ino);
3138 dip->di_gen = cpu_to_le32(ip->i_generation);
3139 dip->di_size = cpu_to_le64(ip->i_size);
3140 dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
3141 dip->di_nlink = cpu_to_le32(ip->i_nlink);
3142 if (!uid_valid(sbi->uid))
3143 dip->di_uid = cpu_to_le32(i_uid_read(ip));
3144 else
3145 dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns,
3146 jfs_ip->saved_uid));
3147 if (!gid_valid(sbi->gid))
3148 dip->di_gid = cpu_to_le32(i_gid_read(ip));
3149 else
3150 dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns,
3151 jfs_ip->saved_gid));
3152 jfs_get_inode_flags(jfs_ip);
3153 /*
3154 * mode2 is only needed for storing the higher order bits.
3155 * Trust i_mode for the lower order ones
3156 */
3157 if (sbi->umask == -1)
3158 dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) |
3159 ip->i_mode);
3160 else /* Leave the original permissions alone */
3161 dip->di_mode = cpu_to_le32(jfs_ip->mode2);
3162
3163 dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec);
3164 dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec);
3165 dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec);
3166 dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec);
3167 dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec);
3168 dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec);
3169 dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */
3170 dip->di_acl = jfs_ip->acl; /* as are dxd's */
3171 dip->di_ea = jfs_ip->ea;
3172 dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
3173 dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
3174 dip->di_otime.tv_nsec = 0;
3175 dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
3176 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
3177 dip->di_rdev = cpu_to_le32(jfs_ip->dev);
3178}