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