nfsd: Fix oops when parsing a 0 length export
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jfs / jfs_imap.c
blobb78b2f978f043dae0f18c24713532218b3201582
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * jfs_imap.c: inode allocation map manager
22 * Serialization:
23 * Each AG has a simple lock which is used to control the serialization of
24 * the AG level lists. This lock should be taken first whenever an AG
25 * level list will be modified or accessed.
27 * Each IAG is locked by obtaining the buffer for the IAG page.
29 * There is also a inode lock for the inode map inode. A read lock needs to
30 * be taken whenever an IAG is read from the map or the global level
31 * information is read. A write lock needs to be taken whenever the global
32 * level information is modified or an atomic operation needs to be used.
34 * If more than one IAG is read at one time, the read lock may not
35 * be given up until all of the IAG's are read. Otherwise, a deadlock
36 * may occur when trying to obtain the read lock while another thread
37 * holding the read lock is waiting on the IAG already being held.
39 * The control page of the inode map is read into memory by diMount().
40 * Thereafter it should only be modified in memory and then it will be
41 * written out when the filesystem is unmounted by diUnmount().
44 #include <linux/fs.h>
45 #include <linux/buffer_head.h>
46 #include <linux/pagemap.h>
47 #include <linux/quotaops.h>
48 #include <linux/slab.h>
50 #include "jfs_incore.h"
51 #include "jfs_inode.h"
52 #include "jfs_filsys.h"
53 #include "jfs_dinode.h"
54 #include "jfs_dmap.h"
55 #include "jfs_imap.h"
56 #include "jfs_metapage.h"
57 #include "jfs_superblock.h"
58 #include "jfs_debug.h"
61 * imap locks
63 /* iag free list lock */
64 #define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock)
65 #define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock)
66 #define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock)
68 /* per ag iag list locks */
69 #define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index]))
70 #define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno])
71 #define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno])
74 * forward references
76 static int diAllocAG(struct inomap *, int, bool, struct inode *);
77 static int diAllocAny(struct inomap *, int, bool, struct inode *);
78 static int diAllocBit(struct inomap *, struct iag *, int);
79 static int diAllocExt(struct inomap *, int, struct inode *);
80 static int diAllocIno(struct inomap *, int, struct inode *);
81 static int diFindFree(u32, int);
82 static int diNewExt(struct inomap *, struct iag *, int);
83 static int diNewIAG(struct inomap *, int *, int, struct metapage **);
84 static void duplicateIXtree(struct super_block *, s64, int, s64 *);
86 static int diIAGRead(struct inomap * imap, int, struct metapage **);
87 static int copy_from_dinode(struct dinode *, struct inode *);
88 static void copy_to_dinode(struct dinode *, struct inode *);
91 * NAME: diMount()
93 * FUNCTION: initialize the incore inode map control structures for
94 * a fileset or aggregate init time.
96 * the inode map's control structure (dinomap) is
97 * brought in from disk and placed in virtual memory.
99 * PARAMETERS:
100 * ipimap - pointer to inode map inode for the aggregate or fileset.
102 * RETURN VALUES:
103 * 0 - success
104 * -ENOMEM - insufficient free virtual memory.
105 * -EIO - i/o error.
107 int diMount(struct inode *ipimap)
109 struct inomap *imap;
110 struct metapage *mp;
111 int index;
112 struct dinomap_disk *dinom_le;
115 * allocate/initialize the in-memory inode map control structure
117 /* allocate the in-memory inode map control structure. */
118 imap = kmalloc(sizeof(struct inomap), GFP_KERNEL);
119 if (imap == NULL) {
120 jfs_err("diMount: kmalloc returned NULL!");
121 return -ENOMEM;
124 /* read the on-disk inode map control structure. */
126 mp = read_metapage(ipimap,
127 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
128 PSIZE, 0);
129 if (mp == NULL) {
130 kfree(imap);
131 return -EIO;
134 /* copy the on-disk version to the in-memory version. */
135 dinom_le = (struct dinomap_disk *) mp->data;
136 imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
137 imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
138 atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
139 atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
140 imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
141 imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
142 for (index = 0; index < MAXAG; index++) {
143 imap->im_agctl[index].inofree =
144 le32_to_cpu(dinom_le->in_agctl[index].inofree);
145 imap->im_agctl[index].extfree =
146 le32_to_cpu(dinom_le->in_agctl[index].extfree);
147 imap->im_agctl[index].numinos =
148 le32_to_cpu(dinom_le->in_agctl[index].numinos);
149 imap->im_agctl[index].numfree =
150 le32_to_cpu(dinom_le->in_agctl[index].numfree);
153 /* release the buffer. */
154 release_metapage(mp);
157 * allocate/initialize inode allocation map locks
159 /* allocate and init iag free list lock */
160 IAGFREE_LOCK_INIT(imap);
162 /* allocate and init ag list locks */
163 for (index = 0; index < MAXAG; index++) {
164 AG_LOCK_INIT(imap, index);
167 /* bind the inode map inode and inode map control structure
168 * to each other.
170 imap->im_ipimap = ipimap;
171 JFS_IP(ipimap)->i_imap = imap;
173 return (0);
178 * NAME: diUnmount()
180 * FUNCTION: write to disk the incore inode map control structures for
181 * a fileset or aggregate at unmount time.
183 * PARAMETERS:
184 * ipimap - pointer to inode map inode for the aggregate or fileset.
186 * RETURN VALUES:
187 * 0 - success
188 * -ENOMEM - insufficient free virtual memory.
189 * -EIO - i/o error.
191 int diUnmount(struct inode *ipimap, int mounterror)
193 struct inomap *imap = JFS_IP(ipimap)->i_imap;
196 * update the on-disk inode map control structure
199 if (!(mounterror || isReadOnly(ipimap)))
200 diSync(ipimap);
203 * Invalidate the page cache buffers
205 truncate_inode_pages(ipimap->i_mapping, 0);
208 * free in-memory control structure
210 kfree(imap);
212 return (0);
217 * diSync()
219 int diSync(struct inode *ipimap)
221 struct dinomap_disk *dinom_le;
222 struct inomap *imp = JFS_IP(ipimap)->i_imap;
223 struct metapage *mp;
224 int index;
227 * write imap global conrol page
229 /* read the on-disk inode map control structure */
230 mp = get_metapage(ipimap,
231 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
232 PSIZE, 0);
233 if (mp == NULL) {
234 jfs_err("diSync: get_metapage failed!");
235 return -EIO;
238 /* copy the in-memory version to the on-disk version */
239 dinom_le = (struct dinomap_disk *) mp->data;
240 dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
241 dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
242 dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
243 dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
244 dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
245 dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
246 for (index = 0; index < MAXAG; index++) {
247 dinom_le->in_agctl[index].inofree =
248 cpu_to_le32(imp->im_agctl[index].inofree);
249 dinom_le->in_agctl[index].extfree =
250 cpu_to_le32(imp->im_agctl[index].extfree);
251 dinom_le->in_agctl[index].numinos =
252 cpu_to_le32(imp->im_agctl[index].numinos);
253 dinom_le->in_agctl[index].numfree =
254 cpu_to_le32(imp->im_agctl[index].numfree);
257 /* write out the control structure */
258 write_metapage(mp);
261 * write out dirty pages of imap
263 filemap_write_and_wait(ipimap->i_mapping);
265 diWriteSpecial(ipimap, 0);
267 return (0);
272 * NAME: diRead()
274 * FUNCTION: initialize an incore inode from disk.
276 * on entry, the specifed incore inode should itself
277 * specify the disk inode number corresponding to the
278 * incore inode (i.e. i_number should be initialized).
280 * this routine handles incore inode initialization for
281 * both "special" and "regular" inodes. special inodes
282 * are those required early in the mount process and
283 * require special handling since much of the file system
284 * is not yet initialized. these "special" inodes are
285 * identified by a NULL inode map inode pointer and are
286 * actually initialized by a call to diReadSpecial().
288 * for regular inodes, the iag describing the disk inode
289 * is read from disk to determine the inode extent address
290 * for the disk inode. with the inode extent address in
291 * hand, the page of the extent that contains the disk
292 * inode is read and the disk inode is copied to the
293 * incore inode.
295 * PARAMETERS:
296 * ip - pointer to incore inode to be initialized from disk.
298 * RETURN VALUES:
299 * 0 - success
300 * -EIO - i/o error.
301 * -ENOMEM - insufficient memory
304 int diRead(struct inode *ip)
306 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
307 int iagno, ino, extno, rc;
308 struct inode *ipimap;
309 struct dinode *dp;
310 struct iag *iagp;
311 struct metapage *mp;
312 s64 blkno, agstart;
313 struct inomap *imap;
314 int block_offset;
315 int inodes_left;
316 unsigned long pageno;
317 int rel_inode;
319 jfs_info("diRead: ino = %ld", ip->i_ino);
321 ipimap = sbi->ipimap;
322 JFS_IP(ip)->ipimap = ipimap;
324 /* determine the iag number for this inode (number) */
325 iagno = INOTOIAG(ip->i_ino);
327 /* read the iag */
328 imap = JFS_IP(ipimap)->i_imap;
329 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
330 rc = diIAGRead(imap, iagno, &mp);
331 IREAD_UNLOCK(ipimap);
332 if (rc) {
333 jfs_err("diRead: diIAGRead returned %d", rc);
334 return (rc);
337 iagp = (struct iag *) mp->data;
339 /* determine inode extent that holds the disk inode */
340 ino = ip->i_ino & (INOSPERIAG - 1);
341 extno = ino >> L2INOSPEREXT;
343 if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) ||
344 (addressPXD(&iagp->inoext[extno]) == 0)) {
345 release_metapage(mp);
346 return -ESTALE;
349 /* get disk block number of the page within the inode extent
350 * that holds the disk inode.
352 blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);
354 /* get the ag for the iag */
355 agstart = le64_to_cpu(iagp->agstart);
357 release_metapage(mp);
359 rel_inode = (ino & (INOSPERPAGE - 1));
360 pageno = blkno >> sbi->l2nbperpage;
362 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
364 * OS/2 didn't always align inode extents on page boundaries
366 inodes_left =
367 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
369 if (rel_inode < inodes_left)
370 rel_inode += block_offset << sbi->l2niperblk;
371 else {
372 pageno += 1;
373 rel_inode -= inodes_left;
377 /* read the page of disk inode */
378 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
379 if (!mp) {
380 jfs_err("diRead: read_metapage failed");
381 return -EIO;
384 /* locate the disk inode requested */
385 dp = (struct dinode *) mp->data;
386 dp += rel_inode;
388 if (ip->i_ino != le32_to_cpu(dp->di_number)) {
389 jfs_error(ip->i_sb, "diRead: i_ino != di_number");
390 rc = -EIO;
391 } else if (le32_to_cpu(dp->di_nlink) == 0)
392 rc = -ESTALE;
393 else
394 /* copy the disk inode to the in-memory inode */
395 rc = copy_from_dinode(dp, ip);
397 release_metapage(mp);
399 /* set the ag for the inode */
400 JFS_IP(ip)->agstart = agstart;
401 JFS_IP(ip)->active_ag = -1;
403 return (rc);
408 * NAME: diReadSpecial()
410 * FUNCTION: initialize a 'special' inode from disk.
412 * this routines handles aggregate level inodes. The
413 * inode cache cannot differentiate between the
414 * aggregate inodes and the filesystem inodes, so we
415 * handle these here. We don't actually use the aggregate
416 * inode map, since these inodes are at a fixed location
417 * and in some cases the aggregate inode map isn't initialized
418 * yet.
420 * PARAMETERS:
421 * sb - filesystem superblock
422 * inum - aggregate inode number
423 * secondary - 1 if secondary aggregate inode table
425 * RETURN VALUES:
426 * new inode - success
427 * NULL - i/o error.
429 struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
431 struct jfs_sb_info *sbi = JFS_SBI(sb);
432 uint address;
433 struct dinode *dp;
434 struct inode *ip;
435 struct metapage *mp;
437 ip = new_inode(sb);
438 if (ip == NULL) {
439 jfs_err("diReadSpecial: new_inode returned NULL!");
440 return ip;
443 if (secondary) {
444 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
445 JFS_IP(ip)->ipimap = sbi->ipaimap2;
446 } else {
447 address = AITBL_OFF >> L2PSIZE;
448 JFS_IP(ip)->ipimap = sbi->ipaimap;
451 ASSERT(inum < INOSPEREXT);
453 ip->i_ino = inum;
455 address += inum >> 3; /* 8 inodes per 4K page */
457 /* read the page of fixed disk inode (AIT) in raw mode */
458 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
459 if (mp == NULL) {
460 ip->i_nlink = 1; /* Don't want iput() deleting it */
461 iput(ip);
462 return (NULL);
465 /* get the pointer to the disk inode of interest */
466 dp = (struct dinode *) (mp->data);
467 dp += inum % 8; /* 8 inodes per 4K page */
469 /* copy on-disk inode to in-memory inode */
470 if ((copy_from_dinode(dp, ip)) != 0) {
471 /* handle bad return by returning NULL for ip */
472 ip->i_nlink = 1; /* Don't want iput() deleting it */
473 iput(ip);
474 /* release the page */
475 release_metapage(mp);
476 return (NULL);
480 ip->i_mapping->a_ops = &jfs_metapage_aops;
481 mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);
483 /* Allocations to metadata inodes should not affect quotas */
484 ip->i_flags |= S_NOQUOTA;
486 if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
487 sbi->gengen = le32_to_cpu(dp->di_gengen);
488 sbi->inostamp = le32_to_cpu(dp->di_inostamp);
491 /* release the page */
492 release_metapage(mp);
495 * __mark_inode_dirty expects inodes to be hashed. Since we don't
496 * want special inodes in the fileset inode space, we make them
497 * appear hashed, but do not put on any lists. hlist_del()
498 * will work fine and require no locking.
500 hlist_add_fake(&ip->i_hash);
502 return (ip);
506 * NAME: diWriteSpecial()
508 * FUNCTION: Write the special inode to disk
510 * PARAMETERS:
511 * ip - special inode
512 * secondary - 1 if secondary aggregate inode table
514 * RETURN VALUES: none
517 void diWriteSpecial(struct inode *ip, int secondary)
519 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
520 uint address;
521 struct dinode *dp;
522 ino_t inum = ip->i_ino;
523 struct metapage *mp;
525 if (secondary)
526 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
527 else
528 address = AITBL_OFF >> L2PSIZE;
530 ASSERT(inum < INOSPEREXT);
532 address += inum >> 3; /* 8 inodes per 4K page */
534 /* read the page of fixed disk inode (AIT) in raw mode */
535 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
536 if (mp == NULL) {
537 jfs_err("diWriteSpecial: failed to read aggregate inode "
538 "extent!");
539 return;
542 /* get the pointer to the disk inode of interest */
543 dp = (struct dinode *) (mp->data);
544 dp += inum % 8; /* 8 inodes per 4K page */
546 /* copy on-disk inode to in-memory inode */
547 copy_to_dinode(dp, ip);
548 memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
550 if (inum == FILESYSTEM_I)
551 dp->di_gengen = cpu_to_le32(sbi->gengen);
553 /* write the page */
554 write_metapage(mp);
558 * NAME: diFreeSpecial()
560 * FUNCTION: Free allocated space for special inode
562 void diFreeSpecial(struct inode *ip)
564 if (ip == NULL) {
565 jfs_err("diFreeSpecial called with NULL ip!");
566 return;
568 filemap_write_and_wait(ip->i_mapping);
569 truncate_inode_pages(ip->i_mapping, 0);
570 iput(ip);
576 * NAME: diWrite()
578 * FUNCTION: write the on-disk inode portion of the in-memory inode
579 * to its corresponding on-disk inode.
581 * on entry, the specifed incore inode should itself
582 * specify the disk inode number corresponding to the
583 * incore inode (i.e. i_number should be initialized).
585 * the inode contains the inode extent address for the disk
586 * inode. with the inode extent address in hand, the
587 * page of the extent that contains the disk inode is
588 * read and the disk inode portion of the incore inode
589 * is copied to the disk inode.
591 * PARAMETERS:
592 * tid - transacation id
593 * ip - pointer to incore inode to be written to the inode extent.
595 * RETURN VALUES:
596 * 0 - success
597 * -EIO - i/o error.
599 int diWrite(tid_t tid, struct inode *ip)
601 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
602 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
603 int rc = 0;
604 s32 ino;
605 struct dinode *dp;
606 s64 blkno;
607 int block_offset;
608 int inodes_left;
609 struct metapage *mp;
610 unsigned long pageno;
611 int rel_inode;
612 int dioffset;
613 struct inode *ipimap;
614 uint type;
615 lid_t lid;
616 struct tlock *ditlck, *tlck;
617 struct linelock *dilinelock, *ilinelock;
618 struct lv *lv;
619 int n;
621 ipimap = jfs_ip->ipimap;
623 ino = ip->i_ino & (INOSPERIAG - 1);
625 if (!addressPXD(&(jfs_ip->ixpxd)) ||
626 (lengthPXD(&(jfs_ip->ixpxd)) !=
627 JFS_IP(ipimap)->i_imap->im_nbperiext)) {
628 jfs_error(ip->i_sb, "diWrite: ixpxd invalid");
629 return -EIO;
633 * read the page of disk inode containing the specified inode:
635 /* compute the block address of the page */
636 blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
638 rel_inode = (ino & (INOSPERPAGE - 1));
639 pageno = blkno >> sbi->l2nbperpage;
641 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
643 * OS/2 didn't always align inode extents on page boundaries
645 inodes_left =
646 (sbi->nbperpage - block_offset) << sbi->l2niperblk;
648 if (rel_inode < inodes_left)
649 rel_inode += block_offset << sbi->l2niperblk;
650 else {
651 pageno += 1;
652 rel_inode -= inodes_left;
655 /* read the page of disk inode */
656 retry:
657 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
658 if (!mp)
659 return -EIO;
661 /* get the pointer to the disk inode */
662 dp = (struct dinode *) mp->data;
663 dp += rel_inode;
665 dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
668 * acquire transaction lock on the on-disk inode;
669 * N.B. tlock is acquired on ipimap not ip;
671 if ((ditlck =
672 txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
673 goto retry;
674 dilinelock = (struct linelock *) & ditlck->lock;
677 * copy btree root from in-memory inode to on-disk inode
679 * (tlock is taken from inline B+-tree root in in-memory
680 * inode when the B+-tree root is updated, which is pointed
681 * by jfs_ip->blid as well as being on tx tlock list)
683 * further processing of btree root is based on the copy
684 * in in-memory inode, where txLog() will log from, and,
685 * for xtree root, txUpdateMap() will update map and reset
686 * XAD_NEW bit;
689 if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
691 * This is the special xtree inside the directory for storing
692 * the directory table
694 xtpage_t *p, *xp;
695 xad_t *xad;
697 jfs_ip->xtlid = 0;
698 tlck = lid_to_tlock(lid);
699 assert(tlck->type & tlckXTREE);
700 tlck->type |= tlckBTROOT;
701 tlck->mp = mp;
702 ilinelock = (struct linelock *) & tlck->lock;
705 * copy xtree root from inode to dinode:
707 p = &jfs_ip->i_xtroot;
708 xp = (xtpage_t *) &dp->di_dirtable;
709 lv = ilinelock->lv;
710 for (n = 0; n < ilinelock->index; n++, lv++) {
711 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
712 lv->length << L2XTSLOTSIZE);
715 /* reset on-disk (metadata page) xtree XAD_NEW bit */
716 xad = &xp->xad[XTENTRYSTART];
717 for (n = XTENTRYSTART;
718 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
719 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
720 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
723 if ((lid = jfs_ip->blid) == 0)
724 goto inlineData;
725 jfs_ip->blid = 0;
727 tlck = lid_to_tlock(lid);
728 type = tlck->type;
729 tlck->type |= tlckBTROOT;
730 tlck->mp = mp;
731 ilinelock = (struct linelock *) & tlck->lock;
734 * regular file: 16 byte (XAD slot) granularity
736 if (type & tlckXTREE) {
737 xtpage_t *p, *xp;
738 xad_t *xad;
741 * copy xtree root from inode to dinode:
743 p = &jfs_ip->i_xtroot;
744 xp = &dp->di_xtroot;
745 lv = ilinelock->lv;
746 for (n = 0; n < ilinelock->index; n++, lv++) {
747 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
748 lv->length << L2XTSLOTSIZE);
751 /* reset on-disk (metadata page) xtree XAD_NEW bit */
752 xad = &xp->xad[XTENTRYSTART];
753 for (n = XTENTRYSTART;
754 n < le16_to_cpu(xp->header.nextindex); n++, xad++)
755 if (xad->flag & (XAD_NEW | XAD_EXTENDED))
756 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
759 * directory: 32 byte (directory entry slot) granularity
761 else if (type & tlckDTREE) {
762 dtpage_t *p, *xp;
765 * copy dtree root from inode to dinode:
767 p = (dtpage_t *) &jfs_ip->i_dtroot;
768 xp = (dtpage_t *) & dp->di_dtroot;
769 lv = ilinelock->lv;
770 for (n = 0; n < ilinelock->index; n++, lv++) {
771 memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
772 lv->length << L2DTSLOTSIZE);
774 } else {
775 jfs_err("diWrite: UFO tlock");
778 inlineData:
780 * copy inline symlink from in-memory inode to on-disk inode
782 if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
783 lv = & dilinelock->lv[dilinelock->index];
784 lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
785 lv->length = 2;
786 memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
787 dilinelock->index++;
790 * copy inline data from in-memory inode to on-disk inode:
791 * 128 byte slot granularity
793 if (test_cflag(COMMIT_Inlineea, ip)) {
794 lv = & dilinelock->lv[dilinelock->index];
795 lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
796 lv->length = 1;
797 memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
798 dilinelock->index++;
800 clear_cflag(COMMIT_Inlineea, ip);
804 * lock/copy inode base: 128 byte slot granularity
806 lv = & dilinelock->lv[dilinelock->index];
807 lv->offset = dioffset >> L2INODESLOTSIZE;
808 copy_to_dinode(dp, ip);
809 if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
810 lv->length = 2;
811 memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
812 } else
813 lv->length = 1;
814 dilinelock->index++;
816 /* release the buffer holding the updated on-disk inode.
817 * the buffer will be later written by commit processing.
819 write_metapage(mp);
821 return (rc);
826 * NAME: diFree(ip)
828 * FUNCTION: free a specified inode from the inode working map
829 * for a fileset or aggregate.
831 * if the inode to be freed represents the first (only)
832 * free inode within the iag, the iag will be placed on
833 * the ag free inode list.
835 * freeing the inode will cause the inode extent to be
836 * freed if the inode is the only allocated inode within
837 * the extent. in this case all the disk resource backing
838 * up the inode extent will be freed. in addition, the iag
839 * will be placed on the ag extent free list if the extent
840 * is the first free extent in the iag. if freeing the
841 * extent also means that no free inodes will exist for
842 * the iag, the iag will also be removed from the ag free
843 * inode list.
845 * the iag describing the inode will be freed if the extent
846 * is to be freed and it is the only backed extent within
847 * the iag. in this case, the iag will be removed from the
848 * ag free extent list and ag free inode list and placed on
849 * the inode map's free iag list.
851 * a careful update approach is used to provide consistency
852 * in the face of updates to multiple buffers. under this
853 * approach, all required buffers are obtained before making
854 * any updates and are held until all updates are complete.
856 * PARAMETERS:
857 * ip - inode to be freed.
859 * RETURN VALUES:
860 * 0 - success
861 * -EIO - i/o error.
863 int diFree(struct inode *ip)
865 int rc;
866 ino_t inum = ip->i_ino;
867 struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
868 struct metapage *mp, *amp, *bmp, *cmp, *dmp;
869 int iagno, ino, extno, bitno, sword, agno;
870 int back, fwd;
871 u32 bitmap, mask;
872 struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
873 struct inomap *imap = JFS_IP(ipimap)->i_imap;
874 pxd_t freepxd;
875 tid_t tid;
876 struct inode *iplist[3];
877 struct tlock *tlck;
878 struct pxd_lock *pxdlock;
881 * This is just to suppress compiler warnings. The same logic that
882 * references these variables is used to initialize them.
884 aiagp = biagp = ciagp = diagp = NULL;
886 /* get the iag number containing the inode.
888 iagno = INOTOIAG(inum);
890 /* make sure that the iag is contained within
891 * the map.
893 if (iagno >= imap->im_nextiag) {
894 print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4,
895 imap, 32, 0);
896 jfs_error(ip->i_sb,
897 "diFree: inum = %d, iagno = %d, nextiag = %d",
898 (uint) inum, iagno, imap->im_nextiag);
899 return -EIO;
902 /* get the allocation group for this ino.
904 agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
906 /* Lock the AG specific inode map information
908 AG_LOCK(imap, agno);
910 /* Obtain read lock in imap inode. Don't release it until we have
911 * read all of the IAG's that we are going to.
913 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
915 /* read the iag.
917 if ((rc = diIAGRead(imap, iagno, &mp))) {
918 IREAD_UNLOCK(ipimap);
919 AG_UNLOCK(imap, agno);
920 return (rc);
922 iagp = (struct iag *) mp->data;
924 /* get the inode number and extent number of the inode within
925 * the iag and the inode number within the extent.
927 ino = inum & (INOSPERIAG - 1);
928 extno = ino >> L2INOSPEREXT;
929 bitno = ino & (INOSPEREXT - 1);
930 mask = HIGHORDER >> bitno;
932 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
933 jfs_error(ip->i_sb,
934 "diFree: wmap shows inode already free");
937 if (!addressPXD(&iagp->inoext[extno])) {
938 release_metapage(mp);
939 IREAD_UNLOCK(ipimap);
940 AG_UNLOCK(imap, agno);
941 jfs_error(ip->i_sb, "diFree: invalid inoext");
942 return -EIO;
945 /* compute the bitmap for the extent reflecting the freed inode.
947 bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
949 if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
950 release_metapage(mp);
951 IREAD_UNLOCK(ipimap);
952 AG_UNLOCK(imap, agno);
953 jfs_error(ip->i_sb, "diFree: numfree > numinos");
954 return -EIO;
957 * inode extent still has some inodes or below low water mark:
958 * keep the inode extent;
960 if (bitmap ||
961 imap->im_agctl[agno].numfree < 96 ||
962 (imap->im_agctl[agno].numfree < 288 &&
963 (((imap->im_agctl[agno].numfree * 100) /
964 imap->im_agctl[agno].numinos) <= 25))) {
965 /* if the iag currently has no free inodes (i.e.,
966 * the inode being freed is the first free inode of iag),
967 * insert the iag at head of the inode free list for the ag.
969 if (iagp->nfreeinos == 0) {
970 /* check if there are any iags on the ag inode
971 * free list. if so, read the first one so that
972 * we can link the current iag onto the list at
973 * the head.
975 if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
976 /* read the iag that currently is the head
977 * of the list.
979 if ((rc = diIAGRead(imap, fwd, &amp))) {
980 IREAD_UNLOCK(ipimap);
981 AG_UNLOCK(imap, agno);
982 release_metapage(mp);
983 return (rc);
985 aiagp = (struct iag *) amp->data;
987 /* make current head point back to the iag.
989 aiagp->inofreeback = cpu_to_le32(iagno);
991 write_metapage(amp);
994 /* iag points forward to current head and iag
995 * becomes the new head of the list.
997 iagp->inofreefwd =
998 cpu_to_le32(imap->im_agctl[agno].inofree);
999 iagp->inofreeback = cpu_to_le32(-1);
1000 imap->im_agctl[agno].inofree = iagno;
1002 IREAD_UNLOCK(ipimap);
1004 /* update the free inode summary map for the extent if
1005 * freeing the inode means the extent will now have free
1006 * inodes (i.e., the inode being freed is the first free
1007 * inode of extent),
1009 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
1010 sword = extno >> L2EXTSPERSUM;
1011 bitno = extno & (EXTSPERSUM - 1);
1012 iagp->inosmap[sword] &=
1013 cpu_to_le32(~(HIGHORDER >> bitno));
1016 /* update the bitmap.
1018 iagp->wmap[extno] = cpu_to_le32(bitmap);
1020 /* update the free inode counts at the iag, ag and
1021 * map level.
1023 le32_add_cpu(&iagp->nfreeinos, 1);
1024 imap->im_agctl[agno].numfree += 1;
1025 atomic_inc(&imap->im_numfree);
1027 /* release the AG inode map lock
1029 AG_UNLOCK(imap, agno);
1031 /* write the iag */
1032 write_metapage(mp);
1034 return (0);
1039 * inode extent has become free and above low water mark:
1040 * free the inode extent;
1044 * prepare to update iag list(s) (careful update step 1)
1046 amp = bmp = cmp = dmp = NULL;
1047 fwd = back = -1;
1049 /* check if the iag currently has no free extents. if so,
1050 * it will be placed on the head of the ag extent free list.
1052 if (iagp->nfreeexts == 0) {
1053 /* check if the ag extent free list has any iags.
1054 * if so, read the iag at the head of the list now.
1055 * this (head) iag will be updated later to reflect
1056 * the addition of the current iag at the head of
1057 * the list.
1059 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
1060 if ((rc = diIAGRead(imap, fwd, &amp)))
1061 goto error_out;
1062 aiagp = (struct iag *) amp->data;
1064 } else {
1065 /* iag has free extents. check if the addition of a free
1066 * extent will cause all extents to be free within this
1067 * iag. if so, the iag will be removed from the ag extent
1068 * free list and placed on the inode map's free iag list.
1070 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1071 /* in preparation for removing the iag from the
1072 * ag extent free list, read the iags preceding
1073 * and following the iag on the ag extent free
1074 * list.
1076 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
1077 if ((rc = diIAGRead(imap, fwd, &amp)))
1078 goto error_out;
1079 aiagp = (struct iag *) amp->data;
1082 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
1083 if ((rc = diIAGRead(imap, back, &bmp)))
1084 goto error_out;
1085 biagp = (struct iag *) bmp->data;
1090 /* remove the iag from the ag inode free list if freeing
1091 * this extent cause the iag to have no free inodes.
1093 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1094 int inofreeback = le32_to_cpu(iagp->inofreeback);
1095 int inofreefwd = le32_to_cpu(iagp->inofreefwd);
1097 /* in preparation for removing the iag from the
1098 * ag inode free list, read the iags preceding
1099 * and following the iag on the ag inode free
1100 * list. before reading these iags, we must make
1101 * sure that we already don't have them in hand
1102 * from up above, since re-reading an iag (buffer)
1103 * we are currently holding would cause a deadlock.
1105 if (inofreefwd >= 0) {
1107 if (inofreefwd == fwd)
1108 ciagp = (struct iag *) amp->data;
1109 else if (inofreefwd == back)
1110 ciagp = (struct iag *) bmp->data;
1111 else {
1112 if ((rc =
1113 diIAGRead(imap, inofreefwd, &cmp)))
1114 goto error_out;
1115 ciagp = (struct iag *) cmp->data;
1117 assert(ciagp != NULL);
1120 if (inofreeback >= 0) {
1121 if (inofreeback == fwd)
1122 diagp = (struct iag *) amp->data;
1123 else if (inofreeback == back)
1124 diagp = (struct iag *) bmp->data;
1125 else {
1126 if ((rc =
1127 diIAGRead(imap, inofreeback, &dmp)))
1128 goto error_out;
1129 diagp = (struct iag *) dmp->data;
1131 assert(diagp != NULL);
1135 IREAD_UNLOCK(ipimap);
1138 * invalidate any page of the inode extent freed from buffer cache;
1140 freepxd = iagp->inoext[extno];
1141 invalidate_pxd_metapages(ip, freepxd);
1144 * update iag list(s) (careful update step 2)
1146 /* add the iag to the ag extent free list if this is the
1147 * first free extent for the iag.
1149 if (iagp->nfreeexts == 0) {
1150 if (fwd >= 0)
1151 aiagp->extfreeback = cpu_to_le32(iagno);
1153 iagp->extfreefwd =
1154 cpu_to_le32(imap->im_agctl[agno].extfree);
1155 iagp->extfreeback = cpu_to_le32(-1);
1156 imap->im_agctl[agno].extfree = iagno;
1157 } else {
1158 /* remove the iag from the ag extent list if all extents
1159 * are now free and place it on the inode map iag free list.
1161 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1162 if (fwd >= 0)
1163 aiagp->extfreeback = iagp->extfreeback;
1165 if (back >= 0)
1166 biagp->extfreefwd = iagp->extfreefwd;
1167 else
1168 imap->im_agctl[agno].extfree =
1169 le32_to_cpu(iagp->extfreefwd);
1171 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
1173 IAGFREE_LOCK(imap);
1174 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1175 imap->im_freeiag = iagno;
1176 IAGFREE_UNLOCK(imap);
1180 /* remove the iag from the ag inode free list if freeing
1181 * this extent causes the iag to have no free inodes.
1183 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1184 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
1185 ciagp->inofreeback = iagp->inofreeback;
1187 if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
1188 diagp->inofreefwd = iagp->inofreefwd;
1189 else
1190 imap->im_agctl[agno].inofree =
1191 le32_to_cpu(iagp->inofreefwd);
1193 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
1196 /* update the inode extent address and working map
1197 * to reflect the free extent.
1198 * the permanent map should have been updated already
1199 * for the inode being freed.
1201 if (iagp->pmap[extno] != 0) {
1202 jfs_error(ip->i_sb, "diFree: the pmap does not show inode free");
1204 iagp->wmap[extno] = 0;
1205 PXDlength(&iagp->inoext[extno], 0);
1206 PXDaddress(&iagp->inoext[extno], 0);
1208 /* update the free extent and free inode summary maps
1209 * to reflect the freed extent.
1210 * the inode summary map is marked to indicate no inodes
1211 * available for the freed extent.
1213 sword = extno >> L2EXTSPERSUM;
1214 bitno = extno & (EXTSPERSUM - 1);
1215 mask = HIGHORDER >> bitno;
1216 iagp->inosmap[sword] |= cpu_to_le32(mask);
1217 iagp->extsmap[sword] &= cpu_to_le32(~mask);
1219 /* update the number of free inodes and number of free extents
1220 * for the iag.
1222 le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1));
1223 le32_add_cpu(&iagp->nfreeexts, 1);
1225 /* update the number of free inodes and backed inodes
1226 * at the ag and inode map level.
1228 imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
1229 imap->im_agctl[agno].numinos -= INOSPEREXT;
1230 atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
1231 atomic_sub(INOSPEREXT, &imap->im_numinos);
1233 if (amp)
1234 write_metapage(amp);
1235 if (bmp)
1236 write_metapage(bmp);
1237 if (cmp)
1238 write_metapage(cmp);
1239 if (dmp)
1240 write_metapage(dmp);
1243 * start transaction to update block allocation map
1244 * for the inode extent freed;
1246 * N.B. AG_LOCK is released and iag will be released below, and
1247 * other thread may allocate inode from/reusing the ixad freed
1248 * BUT with new/different backing inode extent from the extent
1249 * to be freed by the transaction;
1251 tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
1252 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
1254 /* acquire tlock of the iag page of the freed ixad
1255 * to force the page NOHOMEOK (even though no data is
1256 * logged from the iag page) until NOREDOPAGE|FREEXTENT log
1257 * for the free of the extent is committed;
1258 * write FREEXTENT|NOREDOPAGE log record
1259 * N.B. linelock is overlaid as freed extent descriptor;
1261 tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
1262 pxdlock = (struct pxd_lock *) & tlck->lock;
1263 pxdlock->flag = mlckFREEPXD;
1264 pxdlock->pxd = freepxd;
1265 pxdlock->index = 1;
1267 write_metapage(mp);
1269 iplist[0] = ipimap;
1272 * logredo needs the IAG number and IAG extent index in order
1273 * to ensure that the IMap is consistent. The least disruptive
1274 * way to pass these values through to the transaction manager
1275 * is in the iplist array.
1277 * It's not pretty, but it works.
1279 iplist[1] = (struct inode *) (size_t)iagno;
1280 iplist[2] = (struct inode *) (size_t)extno;
1282 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
1284 txEnd(tid);
1285 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
1287 /* unlock the AG inode map information */
1288 AG_UNLOCK(imap, agno);
1290 return (0);
1292 error_out:
1293 IREAD_UNLOCK(ipimap);
1295 if (amp)
1296 release_metapage(amp);
1297 if (bmp)
1298 release_metapage(bmp);
1299 if (cmp)
1300 release_metapage(cmp);
1301 if (dmp)
1302 release_metapage(dmp);
1304 AG_UNLOCK(imap, agno);
1306 release_metapage(mp);
1308 return (rc);
1312 * There are several places in the diAlloc* routines where we initialize
1313 * the inode.
1315 static inline void
1316 diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
1318 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
1320 ip->i_ino = (iagno << L2INOSPERIAG) + ino;
1321 jfs_ip->ixpxd = iagp->inoext[extno];
1322 jfs_ip->agstart = le64_to_cpu(iagp->agstart);
1323 jfs_ip->active_ag = -1;
1328 * NAME: diAlloc(pip,dir,ip)
1330 * FUNCTION: allocate a disk inode from the inode working map
1331 * for a fileset or aggregate.
1333 * PARAMETERS:
1334 * pip - pointer to incore inode for the parent inode.
1335 * dir - 'true' if the new disk inode is for a directory.
1336 * ip - pointer to a new inode
1338 * RETURN VALUES:
1339 * 0 - success.
1340 * -ENOSPC - insufficient disk resources.
1341 * -EIO - i/o error.
1343 int diAlloc(struct inode *pip, bool dir, struct inode *ip)
1345 int rc, ino, iagno, addext, extno, bitno, sword;
1346 int nwords, rem, i, agno;
1347 u32 mask, inosmap, extsmap;
1348 struct inode *ipimap;
1349 struct metapage *mp;
1350 ino_t inum;
1351 struct iag *iagp;
1352 struct inomap *imap;
1354 /* get the pointers to the inode map inode and the
1355 * corresponding imap control structure.
1357 ipimap = JFS_SBI(pip->i_sb)->ipimap;
1358 imap = JFS_IP(ipimap)->i_imap;
1359 JFS_IP(ip)->ipimap = ipimap;
1360 JFS_IP(ip)->fileset = FILESYSTEM_I;
1362 /* for a directory, the allocation policy is to start
1363 * at the ag level using the preferred ag.
1365 if (dir) {
1366 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1367 AG_LOCK(imap, agno);
1368 goto tryag;
1371 /* for files, the policy starts off by trying to allocate from
1372 * the same iag containing the parent disk inode:
1373 * try to allocate the new disk inode close to the parent disk
1374 * inode, using parent disk inode number + 1 as the allocation
1375 * hint. (we use a left-to-right policy to attempt to avoid
1376 * moving backward on the disk.) compute the hint within the
1377 * file system and the iag.
1380 /* get the ag number of this iag */
1381 agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
1383 if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
1385 * There is an open file actively growing. We want to
1386 * allocate new inodes from a different ag to avoid
1387 * fragmentation problems.
1389 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1390 AG_LOCK(imap, agno);
1391 goto tryag;
1394 inum = pip->i_ino + 1;
1395 ino = inum & (INOSPERIAG - 1);
1397 /* back off the hint if it is outside of the iag */
1398 if (ino == 0)
1399 inum = pip->i_ino;
1401 /* lock the AG inode map information */
1402 AG_LOCK(imap, agno);
1404 /* Get read lock on imap inode */
1405 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
1407 /* get the iag number and read the iag */
1408 iagno = INOTOIAG(inum);
1409 if ((rc = diIAGRead(imap, iagno, &mp))) {
1410 IREAD_UNLOCK(ipimap);
1411 AG_UNLOCK(imap, agno);
1412 return (rc);
1414 iagp = (struct iag *) mp->data;
1416 /* determine if new inode extent is allowed to be added to the iag.
1417 * new inode extent can be added to the iag if the ag
1418 * has less than 32 free disk inodes and the iag has free extents.
1420 addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
1423 * try to allocate from the IAG
1425 /* check if the inode may be allocated from the iag
1426 * (i.e. the inode has free inodes or new extent can be added).
1428 if (iagp->nfreeinos || addext) {
1429 /* determine the extent number of the hint.
1431 extno = ino >> L2INOSPEREXT;
1433 /* check if the extent containing the hint has backed
1434 * inodes. if so, try to allocate within this extent.
1436 if (addressPXD(&iagp->inoext[extno])) {
1437 bitno = ino & (INOSPEREXT - 1);
1438 if ((bitno =
1439 diFindFree(le32_to_cpu(iagp->wmap[extno]),
1440 bitno))
1441 < INOSPEREXT) {
1442 ino = (extno << L2INOSPEREXT) + bitno;
1444 /* a free inode (bit) was found within this
1445 * extent, so allocate it.
1447 rc = diAllocBit(imap, iagp, ino);
1448 IREAD_UNLOCK(ipimap);
1449 if (rc) {
1450 assert(rc == -EIO);
1451 } else {
1452 /* set the results of the allocation
1453 * and write the iag.
1455 diInitInode(ip, iagno, ino, extno,
1456 iagp);
1457 mark_metapage_dirty(mp);
1459 release_metapage(mp);
1461 /* free the AG lock and return.
1463 AG_UNLOCK(imap, agno);
1464 return (rc);
1467 if (!addext)
1468 extno =
1469 (extno ==
1470 EXTSPERIAG - 1) ? 0 : extno + 1;
1474 * no free inodes within the extent containing the hint.
1476 * try to allocate from the backed extents following
1477 * hint or, if appropriate (i.e. addext is true), allocate
1478 * an extent of free inodes at or following the extent
1479 * containing the hint.
1481 * the free inode and free extent summary maps are used
1482 * here, so determine the starting summary map position
1483 * and the number of words we'll have to examine. again,
1484 * the approach is to allocate following the hint, so we
1485 * might have to initially ignore prior bits of the summary
1486 * map that represent extents prior to the extent containing
1487 * the hint and later revisit these bits.
1489 bitno = extno & (EXTSPERSUM - 1);
1490 nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
1491 sword = extno >> L2EXTSPERSUM;
1493 /* mask any prior bits for the starting words of the
1494 * summary map.
1496 mask = ONES << (EXTSPERSUM - bitno);
1497 inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
1498 extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
1500 /* scan the free inode and free extent summary maps for
1501 * free resources.
1503 for (i = 0; i < nwords; i++) {
1504 /* check if this word of the free inode summary
1505 * map describes an extent with free inodes.
1507 if (~inosmap) {
1508 /* an extent with free inodes has been
1509 * found. determine the extent number
1510 * and the inode number within the extent.
1512 rem = diFindFree(inosmap, 0);
1513 extno = (sword << L2EXTSPERSUM) + rem;
1514 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
1516 if (rem >= INOSPEREXT) {
1517 IREAD_UNLOCK(ipimap);
1518 release_metapage(mp);
1519 AG_UNLOCK(imap, agno);
1520 jfs_error(ip->i_sb,
1521 "diAlloc: can't find free bit "
1522 "in wmap");
1523 return -EIO;
1526 /* determine the inode number within the
1527 * iag and allocate the inode from the
1528 * map.
1530 ino = (extno << L2INOSPEREXT) + rem;
1531 rc = diAllocBit(imap, iagp, ino);
1532 IREAD_UNLOCK(ipimap);
1533 if (rc)
1534 assert(rc == -EIO);
1535 else {
1536 /* set the results of the allocation
1537 * and write the iag.
1539 diInitInode(ip, iagno, ino, extno,
1540 iagp);
1541 mark_metapage_dirty(mp);
1543 release_metapage(mp);
1545 /* free the AG lock and return.
1547 AG_UNLOCK(imap, agno);
1548 return (rc);
1552 /* check if we may allocate an extent of free
1553 * inodes and whether this word of the free
1554 * extents summary map describes a free extent.
1556 if (addext && ~extsmap) {
1557 /* a free extent has been found. determine
1558 * the extent number.
1560 rem = diFindFree(extsmap, 0);
1561 extno = (sword << L2EXTSPERSUM) + rem;
1563 /* allocate an extent of free inodes.
1565 if ((rc = diNewExt(imap, iagp, extno))) {
1566 /* if there is no disk space for a
1567 * new extent, try to allocate the
1568 * disk inode from somewhere else.
1570 if (rc == -ENOSPC)
1571 break;
1573 assert(rc == -EIO);
1574 } else {
1575 /* set the results of the allocation
1576 * and write the iag.
1578 diInitInode(ip, iagno,
1579 extno << L2INOSPEREXT,
1580 extno, iagp);
1581 mark_metapage_dirty(mp);
1583 release_metapage(mp);
1584 /* free the imap inode & the AG lock & return.
1586 IREAD_UNLOCK(ipimap);
1587 AG_UNLOCK(imap, agno);
1588 return (rc);
1591 /* move on to the next set of summary map words.
1593 sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
1594 inosmap = le32_to_cpu(iagp->inosmap[sword]);
1595 extsmap = le32_to_cpu(iagp->extsmap[sword]);
1598 /* unlock imap inode */
1599 IREAD_UNLOCK(ipimap);
1601 /* nothing doing in this iag, so release it. */
1602 release_metapage(mp);
1604 tryag:
1606 * try to allocate anywhere within the same AG as the parent inode.
1608 rc = diAllocAG(imap, agno, dir, ip);
1610 AG_UNLOCK(imap, agno);
1612 if (rc != -ENOSPC)
1613 return (rc);
1616 * try to allocate in any AG.
1618 return (diAllocAny(imap, agno, dir, ip));
1623 * NAME: diAllocAG(imap,agno,dir,ip)
1625 * FUNCTION: allocate a disk inode from the allocation group.
1627 * this routine first determines if a new extent of free
1628 * inodes should be added for the allocation group, with
1629 * the current request satisfied from this extent. if this
1630 * is the case, an attempt will be made to do just that. if
1631 * this attempt fails or it has been determined that a new
1632 * extent should not be added, an attempt is made to satisfy
1633 * the request by allocating an existing (backed) free inode
1634 * from the allocation group.
1636 * PRE CONDITION: Already have the AG lock for this AG.
1638 * PARAMETERS:
1639 * imap - pointer to inode map control structure.
1640 * agno - allocation group to allocate from.
1641 * dir - 'true' if the new disk inode is for a directory.
1642 * ip - pointer to the new inode to be filled in on successful return
1643 * with the disk inode number allocated, its extent address
1644 * and the start of the ag.
1646 * RETURN VALUES:
1647 * 0 - success.
1648 * -ENOSPC - insufficient disk resources.
1649 * -EIO - i/o error.
1651 static int
1652 diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
1654 int rc, addext, numfree, numinos;
1656 /* get the number of free and the number of backed disk
1657 * inodes currently within the ag.
1659 numfree = imap->im_agctl[agno].numfree;
1660 numinos = imap->im_agctl[agno].numinos;
1662 if (numfree > numinos) {
1663 jfs_error(ip->i_sb, "diAllocAG: numfree > numinos");
1664 return -EIO;
1667 /* determine if we should allocate a new extent of free inodes
1668 * within the ag: for directory inodes, add a new extent
1669 * if there are a small number of free inodes or number of free
1670 * inodes is a small percentage of the number of backed inodes.
1672 if (dir)
1673 addext = (numfree < 64 ||
1674 (numfree < 256
1675 && ((numfree * 100) / numinos) <= 20));
1676 else
1677 addext = (numfree == 0);
1680 * try to allocate a new extent of free inodes.
1682 if (addext) {
1683 /* if free space is not available for this new extent, try
1684 * below to allocate a free and existing (already backed)
1685 * inode from the ag.
1687 if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
1688 return (rc);
1692 * try to allocate an existing free inode from the ag.
1694 return (diAllocIno(imap, agno, ip));
1699 * NAME: diAllocAny(imap,agno,dir,iap)
1701 * FUNCTION: allocate a disk inode from any other allocation group.
1703 * this routine is called when an allocation attempt within
1704 * the primary allocation group has failed. if attempts to
1705 * allocate an inode from any allocation group other than the
1706 * specified primary group.
1708 * PARAMETERS:
1709 * imap - pointer to inode map control structure.
1710 * agno - primary allocation group (to avoid).
1711 * dir - 'true' if the new disk inode is for a directory.
1712 * ip - pointer to a new inode to be filled in on successful return
1713 * with the disk inode number allocated, its extent address
1714 * and the start of the ag.
1716 * RETURN VALUES:
1717 * 0 - success.
1718 * -ENOSPC - insufficient disk resources.
1719 * -EIO - i/o error.
1721 static int
1722 diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
1724 int ag, rc;
1725 int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;
1728 /* try to allocate from the ags following agno up to
1729 * the maximum ag number.
1731 for (ag = agno + 1; ag <= maxag; ag++) {
1732 AG_LOCK(imap, ag);
1734 rc = diAllocAG(imap, ag, dir, ip);
1736 AG_UNLOCK(imap, ag);
1738 if (rc != -ENOSPC)
1739 return (rc);
1742 /* try to allocate from the ags in front of agno.
1744 for (ag = 0; ag < agno; ag++) {
1745 AG_LOCK(imap, ag);
1747 rc = diAllocAG(imap, ag, dir, ip);
1749 AG_UNLOCK(imap, ag);
1751 if (rc != -ENOSPC)
1752 return (rc);
1755 /* no free disk inodes.
1757 return -ENOSPC;
1762 * NAME: diAllocIno(imap,agno,ip)
1764 * FUNCTION: allocate a disk inode from the allocation group's free
1765 * inode list, returning an error if this free list is
1766 * empty (i.e. no iags on the list).
1768 * allocation occurs from the first iag on the list using
1769 * the iag's free inode summary map to find the leftmost
1770 * free inode in the iag.
1772 * PRE CONDITION: Already have AG lock for this AG.
1774 * PARAMETERS:
1775 * imap - pointer to inode map control structure.
1776 * agno - allocation group.
1777 * ip - pointer to new inode to be filled in on successful return
1778 * with the disk inode number allocated, its extent address
1779 * and the start of the ag.
1781 * RETURN VALUES:
1782 * 0 - success.
1783 * -ENOSPC - insufficient disk resources.
1784 * -EIO - i/o error.
1786 static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
1788 int iagno, ino, rc, rem, extno, sword;
1789 struct metapage *mp;
1790 struct iag *iagp;
1792 /* check if there are iags on the ag's free inode list.
1794 if ((iagno = imap->im_agctl[agno].inofree) < 0)
1795 return -ENOSPC;
1797 /* obtain read lock on imap inode */
1798 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1800 /* read the iag at the head of the list.
1802 if ((rc = diIAGRead(imap, iagno, &mp))) {
1803 IREAD_UNLOCK(imap->im_ipimap);
1804 return (rc);
1806 iagp = (struct iag *) mp->data;
1808 /* better be free inodes in this iag if it is on the
1809 * list.
1811 if (!iagp->nfreeinos) {
1812 IREAD_UNLOCK(imap->im_ipimap);
1813 release_metapage(mp);
1814 jfs_error(ip->i_sb,
1815 "diAllocIno: nfreeinos = 0, but iag on freelist");
1816 return -EIO;
1819 /* scan the free inode summary map to find an extent
1820 * with free inodes.
1822 for (sword = 0;; sword++) {
1823 if (sword >= SMAPSZ) {
1824 IREAD_UNLOCK(imap->im_ipimap);
1825 release_metapage(mp);
1826 jfs_error(ip->i_sb,
1827 "diAllocIno: free inode not found in summary map");
1828 return -EIO;
1831 if (~iagp->inosmap[sword])
1832 break;
1835 /* found a extent with free inodes. determine
1836 * the extent number.
1838 rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
1839 if (rem >= EXTSPERSUM) {
1840 IREAD_UNLOCK(imap->im_ipimap);
1841 release_metapage(mp);
1842 jfs_error(ip->i_sb, "diAllocIno: no free extent found");
1843 return -EIO;
1845 extno = (sword << L2EXTSPERSUM) + rem;
1847 /* find the first free inode in the extent.
1849 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
1850 if (rem >= INOSPEREXT) {
1851 IREAD_UNLOCK(imap->im_ipimap);
1852 release_metapage(mp);
1853 jfs_error(ip->i_sb, "diAllocIno: free inode not found");
1854 return -EIO;
1857 /* compute the inode number within the iag.
1859 ino = (extno << L2INOSPEREXT) + rem;
1861 /* allocate the inode.
1863 rc = diAllocBit(imap, iagp, ino);
1864 IREAD_UNLOCK(imap->im_ipimap);
1865 if (rc) {
1866 release_metapage(mp);
1867 return (rc);
1870 /* set the results of the allocation and write the iag.
1872 diInitInode(ip, iagno, ino, extno, iagp);
1873 write_metapage(mp);
1875 return (0);
1880 * NAME: diAllocExt(imap,agno,ip)
1882 * FUNCTION: add a new extent of free inodes to an iag, allocating
1883 * an inode from this extent to satisfy the current allocation
1884 * request.
1886 * this routine first tries to find an existing iag with free
1887 * extents through the ag free extent list. if list is not
1888 * empty, the head of the list will be selected as the home
1889 * of the new extent of free inodes. otherwise (the list is
1890 * empty), a new iag will be allocated for the ag to contain
1891 * the extent.
1893 * once an iag has been selected, the free extent summary map
1894 * is used to locate a free extent within the iag and diNewExt()
1895 * is called to initialize the extent, with initialization
1896 * including the allocation of the first inode of the extent
1897 * for the purpose of satisfying this request.
1899 * PARAMETERS:
1900 * imap - pointer to inode map control structure.
1901 * agno - allocation group number.
1902 * ip - pointer to new inode to be filled in on successful return
1903 * with the disk inode number allocated, its extent address
1904 * and the start of the ag.
1906 * RETURN VALUES:
1907 * 0 - success.
1908 * -ENOSPC - insufficient disk resources.
1909 * -EIO - i/o error.
1911 static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
1913 int rem, iagno, sword, extno, rc;
1914 struct metapage *mp;
1915 struct iag *iagp;
1917 /* check if the ag has any iags with free extents. if not,
1918 * allocate a new iag for the ag.
1920 if ((iagno = imap->im_agctl[agno].extfree) < 0) {
1921 /* If successful, diNewIAG will obtain the read lock on the
1922 * imap inode.
1924 if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
1925 return (rc);
1927 iagp = (struct iag *) mp->data;
1929 /* set the ag number if this a brand new iag
1931 iagp->agstart =
1932 cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
1933 } else {
1934 /* read the iag.
1936 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1937 if ((rc = diIAGRead(imap, iagno, &mp))) {
1938 IREAD_UNLOCK(imap->im_ipimap);
1939 jfs_error(ip->i_sb, "diAllocExt: error reading iag");
1940 return rc;
1942 iagp = (struct iag *) mp->data;
1945 /* using the free extent summary map, find a free extent.
1947 for (sword = 0;; sword++) {
1948 if (sword >= SMAPSZ) {
1949 release_metapage(mp);
1950 IREAD_UNLOCK(imap->im_ipimap);
1951 jfs_error(ip->i_sb,
1952 "diAllocExt: free ext summary map not found");
1953 return -EIO;
1955 if (~iagp->extsmap[sword])
1956 break;
1959 /* determine the extent number of the free extent.
1961 rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
1962 if (rem >= EXTSPERSUM) {
1963 release_metapage(mp);
1964 IREAD_UNLOCK(imap->im_ipimap);
1965 jfs_error(ip->i_sb, "diAllocExt: free extent not found");
1966 return -EIO;
1968 extno = (sword << L2EXTSPERSUM) + rem;
1970 /* initialize the new extent.
1972 rc = diNewExt(imap, iagp, extno);
1973 IREAD_UNLOCK(imap->im_ipimap);
1974 if (rc) {
1975 /* something bad happened. if a new iag was allocated,
1976 * place it back on the inode map's iag free list, and
1977 * clear the ag number information.
1979 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
1980 IAGFREE_LOCK(imap);
1981 iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1982 imap->im_freeiag = iagno;
1983 IAGFREE_UNLOCK(imap);
1985 write_metapage(mp);
1986 return (rc);
1989 /* set the results of the allocation and write the iag.
1991 diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp);
1993 write_metapage(mp);
1995 return (0);
2000 * NAME: diAllocBit(imap,iagp,ino)
2002 * FUNCTION: allocate a backed inode from an iag.
2004 * this routine performs the mechanics of allocating a
2005 * specified inode from a backed extent.
2007 * if the inode to be allocated represents the last free
2008 * inode within the iag, the iag will be removed from the
2009 * ag free inode list.
2011 * a careful update approach is used to provide consistency
2012 * in the face of updates to multiple buffers. under this
2013 * approach, all required buffers are obtained before making
2014 * any updates and are held all are updates are complete.
2016 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2017 * this AG. Must have read lock on imap inode.
2019 * PARAMETERS:
2020 * imap - pointer to inode map control structure.
2021 * iagp - pointer to iag.
2022 * ino - inode number to be allocated within the iag.
2024 * RETURN VALUES:
2025 * 0 - success.
2026 * -ENOSPC - insufficient disk resources.
2027 * -EIO - i/o error.
2029 static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
2031 int extno, bitno, agno, sword, rc;
2032 struct metapage *amp = NULL, *bmp = NULL;
2033 struct iag *aiagp = NULL, *biagp = NULL;
2034 u32 mask;
2036 /* check if this is the last free inode within the iag.
2037 * if so, it will have to be removed from the ag free
2038 * inode list, so get the iags preceding and following
2039 * it on the list.
2041 if (iagp->nfreeinos == cpu_to_le32(1)) {
2042 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
2043 if ((rc =
2044 diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
2045 &amp)))
2046 return (rc);
2047 aiagp = (struct iag *) amp->data;
2050 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
2051 if ((rc =
2052 diIAGRead(imap,
2053 le32_to_cpu(iagp->inofreeback),
2054 &bmp))) {
2055 if (amp)
2056 release_metapage(amp);
2057 return (rc);
2059 biagp = (struct iag *) bmp->data;
2063 /* get the ag number, extent number, inode number within
2064 * the extent.
2066 agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
2067 extno = ino >> L2INOSPEREXT;
2068 bitno = ino & (INOSPEREXT - 1);
2070 /* compute the mask for setting the map.
2072 mask = HIGHORDER >> bitno;
2074 /* the inode should be free and backed.
2076 if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
2077 ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
2078 (addressPXD(&iagp->inoext[extno]) == 0)) {
2079 if (amp)
2080 release_metapage(amp);
2081 if (bmp)
2082 release_metapage(bmp);
2084 jfs_error(imap->im_ipimap->i_sb,
2085 "diAllocBit: iag inconsistent");
2086 return -EIO;
2089 /* mark the inode as allocated in the working map.
2091 iagp->wmap[extno] |= cpu_to_le32(mask);
2093 /* check if all inodes within the extent are now
2094 * allocated. if so, update the free inode summary
2095 * map to reflect this.
2097 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
2098 sword = extno >> L2EXTSPERSUM;
2099 bitno = extno & (EXTSPERSUM - 1);
2100 iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
2103 /* if this was the last free inode in the iag, remove the
2104 * iag from the ag free inode list.
2106 if (iagp->nfreeinos == cpu_to_le32(1)) {
2107 if (amp) {
2108 aiagp->inofreeback = iagp->inofreeback;
2109 write_metapage(amp);
2112 if (bmp) {
2113 biagp->inofreefwd = iagp->inofreefwd;
2114 write_metapage(bmp);
2115 } else {
2116 imap->im_agctl[agno].inofree =
2117 le32_to_cpu(iagp->inofreefwd);
2119 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2122 /* update the free inode count at the iag, ag, inode
2123 * map levels.
2125 le32_add_cpu(&iagp->nfreeinos, -1);
2126 imap->im_agctl[agno].numfree -= 1;
2127 atomic_dec(&imap->im_numfree);
2129 return (0);
2134 * NAME: diNewExt(imap,iagp,extno)
2136 * FUNCTION: initialize a new extent of inodes for an iag, allocating
2137 * the first inode of the extent for use for the current
2138 * allocation request.
2140 * disk resources are allocated for the new extent of inodes
2141 * and the inodes themselves are initialized to reflect their
2142 * existence within the extent (i.e. their inode numbers and
2143 * inode extent addresses are set) and their initial state
2144 * (mode and link count are set to zero).
2146 * if the iag is new, it is not yet on an ag extent free list
2147 * but will now be placed on this list.
2149 * if the allocation of the new extent causes the iag to
2150 * have no free extent, the iag will be removed from the
2151 * ag extent free list.
2153 * if the iag has no free backed inodes, it will be placed
2154 * on the ag free inode list, since the addition of the new
2155 * extent will now cause it to have free inodes.
2157 * a careful update approach is used to provide consistency
2158 * (i.e. list consistency) in the face of updates to multiple
2159 * buffers. under this approach, all required buffers are
2160 * obtained before making any updates and are held until all
2161 * updates are complete.
2163 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
2164 * this AG. Must have read lock on imap inode.
2166 * PARAMETERS:
2167 * imap - pointer to inode map control structure.
2168 * iagp - pointer to iag.
2169 * extno - extent number.
2171 * RETURN VALUES:
2172 * 0 - success.
2173 * -ENOSPC - insufficient disk resources.
2174 * -EIO - i/o error.
2176 static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
2178 int agno, iagno, fwd, back, freei = 0, sword, rc;
2179 struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
2180 struct metapage *amp, *bmp, *cmp, *dmp;
2181 struct inode *ipimap;
2182 s64 blkno, hint;
2183 int i, j;
2184 u32 mask;
2185 ino_t ino;
2186 struct dinode *dp;
2187 struct jfs_sb_info *sbi;
2189 /* better have free extents.
2191 if (!iagp->nfreeexts) {
2192 jfs_error(imap->im_ipimap->i_sb, "diNewExt: no free extents");
2193 return -EIO;
2196 /* get the inode map inode.
2198 ipimap = imap->im_ipimap;
2199 sbi = JFS_SBI(ipimap->i_sb);
2201 amp = bmp = cmp = NULL;
2203 /* get the ag and iag numbers for this iag.
2205 agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
2206 iagno = le32_to_cpu(iagp->iagnum);
2208 /* check if this is the last free extent within the
2209 * iag. if so, the iag must be removed from the ag
2210 * free extent list, so get the iags preceding and
2211 * following the iag on this list.
2213 if (iagp->nfreeexts == cpu_to_le32(1)) {
2214 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
2215 if ((rc = diIAGRead(imap, fwd, &amp)))
2216 return (rc);
2217 aiagp = (struct iag *) amp->data;
2220 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
2221 if ((rc = diIAGRead(imap, back, &bmp)))
2222 goto error_out;
2223 biagp = (struct iag *) bmp->data;
2225 } else {
2226 /* the iag has free extents. if all extents are free
2227 * (as is the case for a newly allocated iag), the iag
2228 * must be added to the ag free extent list, so get
2229 * the iag at the head of the list in preparation for
2230 * adding this iag to this list.
2232 fwd = back = -1;
2233 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2234 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
2235 if ((rc = diIAGRead(imap, fwd, &amp)))
2236 goto error_out;
2237 aiagp = (struct iag *) amp->data;
2242 /* check if the iag has no free inodes. if so, the iag
2243 * will have to be added to the ag free inode list, so get
2244 * the iag at the head of the list in preparation for
2245 * adding this iag to this list. in doing this, we must
2246 * check if we already have the iag at the head of
2247 * the list in hand.
2249 if (iagp->nfreeinos == 0) {
2250 freei = imap->im_agctl[agno].inofree;
2252 if (freei >= 0) {
2253 if (freei == fwd) {
2254 ciagp = aiagp;
2255 } else if (freei == back) {
2256 ciagp = biagp;
2257 } else {
2258 if ((rc = diIAGRead(imap, freei, &cmp)))
2259 goto error_out;
2260 ciagp = (struct iag *) cmp->data;
2262 if (ciagp == NULL) {
2263 jfs_error(imap->im_ipimap->i_sb,
2264 "diNewExt: ciagp == NULL");
2265 rc = -EIO;
2266 goto error_out;
2271 /* allocate disk space for the inode extent.
2273 if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0))
2274 hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
2275 else
2276 hint = addressPXD(&iagp->inoext[extno - 1]) +
2277 lengthPXD(&iagp->inoext[extno - 1]) - 1;
2279 if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno)))
2280 goto error_out;
2282 /* compute the inode number of the first inode within the
2283 * extent.
2285 ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
2287 /* initialize the inodes within the newly allocated extent a
2288 * page at a time.
2290 for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
2291 /* get a buffer for this page of disk inodes.
2293 dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
2294 if (dmp == NULL) {
2295 rc = -EIO;
2296 goto error_out;
2298 dp = (struct dinode *) dmp->data;
2300 /* initialize the inode number, mode, link count and
2301 * inode extent address.
2303 for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
2304 dp->di_inostamp = cpu_to_le32(sbi->inostamp);
2305 dp->di_number = cpu_to_le32(ino);
2306 dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
2307 dp->di_mode = 0;
2308 dp->di_nlink = 0;
2309 PXDaddress(&(dp->di_ixpxd), blkno);
2310 PXDlength(&(dp->di_ixpxd), imap->im_nbperiext);
2312 write_metapage(dmp);
2315 /* if this is the last free extent within the iag, remove the
2316 * iag from the ag free extent list.
2318 if (iagp->nfreeexts == cpu_to_le32(1)) {
2319 if (fwd >= 0)
2320 aiagp->extfreeback = iagp->extfreeback;
2322 if (back >= 0)
2323 biagp->extfreefwd = iagp->extfreefwd;
2324 else
2325 imap->im_agctl[agno].extfree =
2326 le32_to_cpu(iagp->extfreefwd);
2328 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2329 } else {
2330 /* if the iag has all free extents (newly allocated iag),
2331 * add the iag to the ag free extent list.
2333 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2334 if (fwd >= 0)
2335 aiagp->extfreeback = cpu_to_le32(iagno);
2337 iagp->extfreefwd = cpu_to_le32(fwd);
2338 iagp->extfreeback = cpu_to_le32(-1);
2339 imap->im_agctl[agno].extfree = iagno;
2343 /* if the iag has no free inodes, add the iag to the
2344 * ag free inode list.
2346 if (iagp->nfreeinos == 0) {
2347 if (freei >= 0)
2348 ciagp->inofreeback = cpu_to_le32(iagno);
2350 iagp->inofreefwd =
2351 cpu_to_le32(imap->im_agctl[agno].inofree);
2352 iagp->inofreeback = cpu_to_le32(-1);
2353 imap->im_agctl[agno].inofree = iagno;
2356 /* initialize the extent descriptor of the extent. */
2357 PXDlength(&iagp->inoext[extno], imap->im_nbperiext);
2358 PXDaddress(&iagp->inoext[extno], blkno);
2360 /* initialize the working and persistent map of the extent.
2361 * the working map will be initialized such that
2362 * it indicates the first inode of the extent is allocated.
2364 iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
2365 iagp->pmap[extno] = 0;
2367 /* update the free inode and free extent summary maps
2368 * for the extent to indicate the extent has free inodes
2369 * and no longer represents a free extent.
2371 sword = extno >> L2EXTSPERSUM;
2372 mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
2373 iagp->extsmap[sword] |= cpu_to_le32(mask);
2374 iagp->inosmap[sword] &= cpu_to_le32(~mask);
2376 /* update the free inode and free extent counts for the
2377 * iag.
2379 le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1));
2380 le32_add_cpu(&iagp->nfreeexts, -1);
2382 /* update the free and backed inode counts for the ag.
2384 imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
2385 imap->im_agctl[agno].numinos += INOSPEREXT;
2387 /* update the free and backed inode counts for the inode map.
2389 atomic_add(INOSPEREXT - 1, &imap->im_numfree);
2390 atomic_add(INOSPEREXT, &imap->im_numinos);
2392 /* write the iags.
2394 if (amp)
2395 write_metapage(amp);
2396 if (bmp)
2397 write_metapage(bmp);
2398 if (cmp)
2399 write_metapage(cmp);
2401 return (0);
2403 error_out:
2405 /* release the iags.
2407 if (amp)
2408 release_metapage(amp);
2409 if (bmp)
2410 release_metapage(bmp);
2411 if (cmp)
2412 release_metapage(cmp);
2414 return (rc);
2419 * NAME: diNewIAG(imap,iagnop,agno)
2421 * FUNCTION: allocate a new iag for an allocation group.
2423 * first tries to allocate the iag from the inode map
2424 * iagfree list:
2425 * if the list has free iags, the head of the list is removed
2426 * and returned to satisfy the request.
2427 * if the inode map's iag free list is empty, the inode map
2428 * is extended to hold a new iag. this new iag is initialized
2429 * and returned to satisfy the request.
2431 * PARAMETERS:
2432 * imap - pointer to inode map control structure.
2433 * iagnop - pointer to an iag number set with the number of the
2434 * newly allocated iag upon successful return.
2435 * agno - allocation group number.
2436 * bpp - Buffer pointer to be filled in with new IAG's buffer
2438 * RETURN VALUES:
2439 * 0 - success.
2440 * -ENOSPC - insufficient disk resources.
2441 * -EIO - i/o error.
2443 * serialization:
2444 * AG lock held on entry/exit;
2445 * write lock on the map is held inside;
2446 * read lock on the map is held on successful completion;
2448 * note: new iag transaction:
2449 * . synchronously write iag;
2450 * . write log of xtree and inode of imap;
2451 * . commit;
2452 * . synchronous write of xtree (right to left, bottom to top);
2453 * . at start of logredo(): init in-memory imap with one additional iag page;
2454 * . at end of logredo(): re-read imap inode to determine
2455 * new imap size;
2457 static int
2458 diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
2460 int rc;
2461 int iagno, i, xlen;
2462 struct inode *ipimap;
2463 struct super_block *sb;
2464 struct jfs_sb_info *sbi;
2465 struct metapage *mp;
2466 struct iag *iagp;
2467 s64 xaddr = 0;
2468 s64 blkno;
2469 tid_t tid;
2470 struct inode *iplist[1];
2472 /* pick up pointers to the inode map and mount inodes */
2473 ipimap = imap->im_ipimap;
2474 sb = ipimap->i_sb;
2475 sbi = JFS_SBI(sb);
2477 /* acquire the free iag lock */
2478 IAGFREE_LOCK(imap);
2480 /* if there are any iags on the inode map free iag list,
2481 * allocate the iag from the head of the list.
2483 if (imap->im_freeiag >= 0) {
2484 /* pick up the iag number at the head of the list */
2485 iagno = imap->im_freeiag;
2487 /* determine the logical block number of the iag */
2488 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2489 } else {
2490 /* no free iags. the inode map will have to be extented
2491 * to include a new iag.
2494 /* acquire inode map lock */
2495 IWRITE_LOCK(ipimap, RDWRLOCK_IMAP);
2497 if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
2498 IWRITE_UNLOCK(ipimap);
2499 IAGFREE_UNLOCK(imap);
2500 jfs_error(imap->im_ipimap->i_sb,
2501 "diNewIAG: ipimap->i_size is wrong");
2502 return -EIO;
2506 /* get the next available iag number */
2507 iagno = imap->im_nextiag;
2509 /* make sure that we have not exceeded the maximum inode
2510 * number limit.
2512 if (iagno > (MAXIAGS - 1)) {
2513 /* release the inode map lock */
2514 IWRITE_UNLOCK(ipimap);
2516 rc = -ENOSPC;
2517 goto out;
2521 * synchronously append new iag page.
2523 /* determine the logical address of iag page to append */
2524 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2526 /* Allocate extent for new iag page */
2527 xlen = sbi->nbperpage;
2528 if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) {
2529 /* release the inode map lock */
2530 IWRITE_UNLOCK(ipimap);
2532 goto out;
2536 * start transaction of update of the inode map
2537 * addressing structure pointing to the new iag page;
2539 tid = txBegin(sb, COMMIT_FORCE);
2540 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
2542 /* update the inode map addressing structure to point to it */
2543 if ((rc =
2544 xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) {
2545 txEnd(tid);
2546 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2547 /* Free the blocks allocated for the iag since it was
2548 * not successfully added to the inode map
2550 dbFree(ipimap, xaddr, (s64) xlen);
2552 /* release the inode map lock */
2553 IWRITE_UNLOCK(ipimap);
2555 goto out;
2558 /* update the inode map's inode to reflect the extension */
2559 ipimap->i_size += PSIZE;
2560 inode_add_bytes(ipimap, PSIZE);
2562 /* assign a buffer for the page */
2563 mp = get_metapage(ipimap, blkno, PSIZE, 0);
2564 if (!mp) {
2566 * This is very unlikely since we just created the
2567 * extent, but let's try to handle it correctly
2569 xtTruncate(tid, ipimap, ipimap->i_size - PSIZE,
2570 COMMIT_PWMAP);
2572 txAbort(tid, 0);
2573 txEnd(tid);
2574 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2576 /* release the inode map lock */
2577 IWRITE_UNLOCK(ipimap);
2579 rc = -EIO;
2580 goto out;
2582 iagp = (struct iag *) mp->data;
2584 /* init the iag */
2585 memset(iagp, 0, sizeof(struct iag));
2586 iagp->iagnum = cpu_to_le32(iagno);
2587 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2588 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2589 iagp->iagfree = cpu_to_le32(-1);
2590 iagp->nfreeinos = 0;
2591 iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
2593 /* initialize the free inode summary map (free extent
2594 * summary map initialization handled by bzero).
2596 for (i = 0; i < SMAPSZ; i++)
2597 iagp->inosmap[i] = cpu_to_le32(ONES);
2600 * Write and sync the metapage
2602 flush_metapage(mp);
2605 * txCommit(COMMIT_FORCE) will synchronously write address
2606 * index pages and inode after commit in careful update order
2607 * of address index pages (right to left, bottom up);
2609 iplist[0] = ipimap;
2610 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
2612 txEnd(tid);
2613 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2615 duplicateIXtree(sb, blkno, xlen, &xaddr);
2617 /* update the next available iag number */
2618 imap->im_nextiag += 1;
2620 /* Add the iag to the iag free list so we don't lose the iag
2621 * if a failure happens now.
2623 imap->im_freeiag = iagno;
2625 /* Until we have logredo working, we want the imap inode &
2626 * control page to be up to date.
2628 diSync(ipimap);
2630 /* release the inode map lock */
2631 IWRITE_UNLOCK(ipimap);
2634 /* obtain read lock on map */
2635 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2637 /* read the iag */
2638 if ((rc = diIAGRead(imap, iagno, &mp))) {
2639 IREAD_UNLOCK(ipimap);
2640 rc = -EIO;
2641 goto out;
2643 iagp = (struct iag *) mp->data;
2645 /* remove the iag from the iag free list */
2646 imap->im_freeiag = le32_to_cpu(iagp->iagfree);
2647 iagp->iagfree = cpu_to_le32(-1);
2649 /* set the return iag number and buffer pointer */
2650 *iagnop = iagno;
2651 *mpp = mp;
2653 out:
2654 /* release the iag free lock */
2655 IAGFREE_UNLOCK(imap);
2657 return (rc);
2661 * NAME: diIAGRead()
2663 * FUNCTION: get the buffer for the specified iag within a fileset
2664 * or aggregate inode map.
2666 * PARAMETERS:
2667 * imap - pointer to inode map control structure.
2668 * iagno - iag number.
2669 * bpp - point to buffer pointer to be filled in on successful
2670 * exit.
2672 * SERIALIZATION:
2673 * must have read lock on imap inode
2674 * (When called by diExtendFS, the filesystem is quiesced, therefore
2675 * the read lock is unnecessary.)
2677 * RETURN VALUES:
2678 * 0 - success.
2679 * -EIO - i/o error.
2681 static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
2683 struct inode *ipimap = imap->im_ipimap;
2684 s64 blkno;
2686 /* compute the logical block number of the iag. */
2687 blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
2689 /* read the iag. */
2690 *mpp = read_metapage(ipimap, blkno, PSIZE, 0);
2691 if (*mpp == NULL) {
2692 return -EIO;
2695 return (0);
2699 * NAME: diFindFree()
2701 * FUNCTION: find the first free bit in a word starting at
2702 * the specified bit position.
2704 * PARAMETERS:
2705 * word - word to be examined.
2706 * start - starting bit position.
2708 * RETURN VALUES:
2709 * bit position of first free bit in the word or 32 if
2710 * no free bits were found.
2712 static int diFindFree(u32 word, int start)
2714 int bitno;
2715 assert(start < 32);
2716 /* scan the word for the first free bit. */
2717 for (word <<= start, bitno = start; bitno < 32;
2718 bitno++, word <<= 1) {
2719 if ((word & HIGHORDER) == 0)
2720 break;
2722 return (bitno);
2726 * NAME: diUpdatePMap()
2728 * FUNCTION: Update the persistent map in an IAG for the allocation or
2729 * freeing of the specified inode.
2731 * PRE CONDITIONS: Working map has already been updated for allocate.
2733 * PARAMETERS:
2734 * ipimap - Incore inode map inode
2735 * inum - Number of inode to mark in permanent map
2736 * is_free - If 'true' indicates inode should be marked freed, otherwise
2737 * indicates inode should be marked allocated.
2739 * RETURN VALUES:
2740 * 0 for success
2743 diUpdatePMap(struct inode *ipimap,
2744 unsigned long inum, bool is_free, struct tblock * tblk)
2746 int rc;
2747 struct iag *iagp;
2748 struct metapage *mp;
2749 int iagno, ino, extno, bitno;
2750 struct inomap *imap;
2751 u32 mask;
2752 struct jfs_log *log;
2753 int lsn, difft, diffp;
2754 unsigned long flags;
2756 imap = JFS_IP(ipimap)->i_imap;
2757 /* get the iag number containing the inode */
2758 iagno = INOTOIAG(inum);
2759 /* make sure that the iag is contained within the map */
2760 if (iagno >= imap->im_nextiag) {
2761 jfs_error(ipimap->i_sb,
2762 "diUpdatePMap: the iag is outside the map");
2763 return -EIO;
2765 /* read the iag */
2766 IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2767 rc = diIAGRead(imap, iagno, &mp);
2768 IREAD_UNLOCK(ipimap);
2769 if (rc)
2770 return (rc);
2771 metapage_wait_for_io(mp);
2772 iagp = (struct iag *) mp->data;
2773 /* get the inode number and extent number of the inode within
2774 * the iag and the inode number within the extent.
2776 ino = inum & (INOSPERIAG - 1);
2777 extno = ino >> L2INOSPEREXT;
2778 bitno = ino & (INOSPEREXT - 1);
2779 mask = HIGHORDER >> bitno;
2781 * mark the inode free in persistent map:
2783 if (is_free) {
2784 /* The inode should have been allocated both in working
2785 * map and in persistent map;
2786 * the inode will be freed from working map at the release
2787 * of last reference release;
2789 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2790 jfs_error(ipimap->i_sb,
2791 "diUpdatePMap: inode %ld not marked as "
2792 "allocated in wmap!", inum);
2794 if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
2795 jfs_error(ipimap->i_sb,
2796 "diUpdatePMap: inode %ld not marked as "
2797 "allocated in pmap!", inum);
2799 /* update the bitmap for the extent of the freed inode */
2800 iagp->pmap[extno] &= cpu_to_le32(~mask);
2803 * mark the inode allocated in persistent map:
2805 else {
2806 /* The inode should be already allocated in the working map
2807 * and should be free in persistent map;
2809 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2810 release_metapage(mp);
2811 jfs_error(ipimap->i_sb,
2812 "diUpdatePMap: the inode is not allocated in "
2813 "the working map");
2814 return -EIO;
2816 if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
2817 release_metapage(mp);
2818 jfs_error(ipimap->i_sb,
2819 "diUpdatePMap: the inode is not free in the "
2820 "persistent map");
2821 return -EIO;
2823 /* update the bitmap for the extent of the allocated inode */
2824 iagp->pmap[extno] |= cpu_to_le32(mask);
2827 * update iag lsn
2829 lsn = tblk->lsn;
2830 log = JFS_SBI(tblk->sb)->log;
2831 LOGSYNC_LOCK(log, flags);
2832 if (mp->lsn != 0) {
2833 /* inherit older/smaller lsn */
2834 logdiff(difft, lsn, log);
2835 logdiff(diffp, mp->lsn, log);
2836 if (difft < diffp) {
2837 mp->lsn = lsn;
2838 /* move mp after tblock in logsync list */
2839 list_move(&mp->synclist, &tblk->synclist);
2841 /* inherit younger/larger clsn */
2842 assert(mp->clsn);
2843 logdiff(difft, tblk->clsn, log);
2844 logdiff(diffp, mp->clsn, log);
2845 if (difft > diffp)
2846 mp->clsn = tblk->clsn;
2847 } else {
2848 mp->log = log;
2849 mp->lsn = lsn;
2850 /* insert mp after tblock in logsync list */
2851 log->count++;
2852 list_add(&mp->synclist, &tblk->synclist);
2853 mp->clsn = tblk->clsn;
2855 LOGSYNC_UNLOCK(log, flags);
2856 write_metapage(mp);
2857 return (0);
2861 * diExtendFS()
2863 * function: update imap for extendfs();
2865 * note: AG size has been increased s.t. each k old contiguous AGs are
2866 * coalesced into a new AG;
2868 int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
2870 int rc, rcx = 0;
2871 struct inomap *imap = JFS_IP(ipimap)->i_imap;
2872 struct iag *iagp = NULL, *hiagp = NULL;
2873 struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap;
2874 struct metapage *bp, *hbp;
2875 int i, n, head;
2876 int numinos, xnuminos = 0, xnumfree = 0;
2877 s64 agstart;
2879 jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
2880 imap->im_nextiag, atomic_read(&imap->im_numinos),
2881 atomic_read(&imap->im_numfree));
2884 * reconstruct imap
2886 * coalesce contiguous k (newAGSize/oldAGSize) AGs;
2887 * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
2888 * note: new AG size = old AG size * (2**x).
2891 /* init per AG control information im_agctl[] */
2892 for (i = 0; i < MAXAG; i++) {
2893 imap->im_agctl[i].inofree = -1;
2894 imap->im_agctl[i].extfree = -1;
2895 imap->im_agctl[i].numinos = 0; /* number of backed inodes */
2896 imap->im_agctl[i].numfree = 0; /* number of free backed inodes */
2900 * process each iag page of the map.
2902 * rebuild AG Free Inode List, AG Free Inode Extent List;
2904 for (i = 0; i < imap->im_nextiag; i++) {
2905 if ((rc = diIAGRead(imap, i, &bp))) {
2906 rcx = rc;
2907 continue;
2909 iagp = (struct iag *) bp->data;
2910 if (le32_to_cpu(iagp->iagnum) != i) {
2911 release_metapage(bp);
2912 jfs_error(ipimap->i_sb,
2913 "diExtendFs: unexpected value of iagnum");
2914 return -EIO;
2917 /* leave free iag in the free iag list */
2918 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2919 release_metapage(bp);
2920 continue;
2923 agstart = le64_to_cpu(iagp->agstart);
2924 n = agstart >> mp->db_agl2size;
2925 iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
2927 /* compute backed inodes */
2928 numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
2929 << L2INOSPEREXT;
2930 if (numinos > 0) {
2931 /* merge AG backed inodes */
2932 imap->im_agctl[n].numinos += numinos;
2933 xnuminos += numinos;
2936 /* if any backed free inodes, insert at AG free inode list */
2937 if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
2938 if ((head = imap->im_agctl[n].inofree) == -1) {
2939 iagp->inofreefwd = cpu_to_le32(-1);
2940 iagp->inofreeback = cpu_to_le32(-1);
2941 } else {
2942 if ((rc = diIAGRead(imap, head, &hbp))) {
2943 rcx = rc;
2944 goto nextiag;
2946 hiagp = (struct iag *) hbp->data;
2947 hiagp->inofreeback = iagp->iagnum;
2948 iagp->inofreefwd = cpu_to_le32(head);
2949 iagp->inofreeback = cpu_to_le32(-1);
2950 write_metapage(hbp);
2953 imap->im_agctl[n].inofree =
2954 le32_to_cpu(iagp->iagnum);
2956 /* merge AG backed free inodes */
2957 imap->im_agctl[n].numfree +=
2958 le32_to_cpu(iagp->nfreeinos);
2959 xnumfree += le32_to_cpu(iagp->nfreeinos);
2962 /* if any free extents, insert at AG free extent list */
2963 if (le32_to_cpu(iagp->nfreeexts) > 0) {
2964 if ((head = imap->im_agctl[n].extfree) == -1) {
2965 iagp->extfreefwd = cpu_to_le32(-1);
2966 iagp->extfreeback = cpu_to_le32(-1);
2967 } else {
2968 if ((rc = diIAGRead(imap, head, &hbp))) {
2969 rcx = rc;
2970 goto nextiag;
2972 hiagp = (struct iag *) hbp->data;
2973 hiagp->extfreeback = iagp->iagnum;
2974 iagp->extfreefwd = cpu_to_le32(head);
2975 iagp->extfreeback = cpu_to_le32(-1);
2976 write_metapage(hbp);
2979 imap->im_agctl[n].extfree =
2980 le32_to_cpu(iagp->iagnum);
2983 nextiag:
2984 write_metapage(bp);
2987 if (xnuminos != atomic_read(&imap->im_numinos) ||
2988 xnumfree != atomic_read(&imap->im_numfree)) {
2989 jfs_error(ipimap->i_sb,
2990 "diExtendFs: numinos or numfree incorrect");
2991 return -EIO;
2994 return rcx;
2999 * duplicateIXtree()
3001 * serialization: IWRITE_LOCK held on entry/exit
3003 * note: shadow page with regular inode (rel.2);
3005 static void duplicateIXtree(struct super_block *sb, s64 blkno,
3006 int xlen, s64 *xaddr)
3008 struct jfs_superblock *j_sb;
3009 struct buffer_head *bh;
3010 struct inode *ip;
3011 tid_t tid;
3013 /* if AIT2 ipmap2 is bad, do not try to update it */
3014 if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */
3015 return;
3016 ip = diReadSpecial(sb, FILESYSTEM_I, 1);
3017 if (ip == NULL) {
3018 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3019 if (readSuper(sb, &bh))
3020 return;
3021 j_sb = (struct jfs_superblock *)bh->b_data;
3022 j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
3024 mark_buffer_dirty(bh);
3025 sync_dirty_buffer(bh);
3026 brelse(bh);
3027 return;
3030 /* start transaction */
3031 tid = txBegin(sb, COMMIT_FORCE);
3032 /* update the inode map addressing structure to point to it */
3033 if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) {
3034 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3035 txAbort(tid, 1);
3036 goto cleanup;
3039 /* update the inode map's inode to reflect the extension */
3040 ip->i_size += PSIZE;
3041 inode_add_bytes(ip, PSIZE);
3042 txCommit(tid, 1, &ip, COMMIT_FORCE);
3043 cleanup:
3044 txEnd(tid);
3045 diFreeSpecial(ip);
3049 * NAME: copy_from_dinode()
3051 * FUNCTION: Copies inode info from disk inode to in-memory inode
3053 * RETURN VALUES:
3054 * 0 - success
3055 * -ENOMEM - insufficient memory
3057 static int copy_from_dinode(struct dinode * dip, struct inode *ip)
3059 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3060 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3062 jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
3063 jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
3064 jfs_set_inode_flags(ip);
3066 ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
3067 if (sbi->umask != -1) {
3068 ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask);
3069 /* For directories, add x permission if r is allowed by umask */
3070 if (S_ISDIR(ip->i_mode)) {
3071 if (ip->i_mode & 0400)
3072 ip->i_mode |= 0100;
3073 if (ip->i_mode & 0040)
3074 ip->i_mode |= 0010;
3075 if (ip->i_mode & 0004)
3076 ip->i_mode |= 0001;
3079 ip->i_nlink = le32_to_cpu(dip->di_nlink);
3081 jfs_ip->saved_uid = le32_to_cpu(dip->di_uid);
3082 if (sbi->uid == -1)
3083 ip->i_uid = jfs_ip->saved_uid;
3084 else {
3085 ip->i_uid = sbi->uid;
3088 jfs_ip->saved_gid = le32_to_cpu(dip->di_gid);
3089 if (sbi->gid == -1)
3090 ip->i_gid = jfs_ip->saved_gid;
3091 else {
3092 ip->i_gid = sbi->gid;
3095 ip->i_size = le64_to_cpu(dip->di_size);
3096 ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec);
3097 ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec);
3098 ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec);
3099 ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec);
3100 ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec);
3101 ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec);
3102 ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
3103 ip->i_generation = le32_to_cpu(dip->di_gen);
3105 jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */
3106 jfs_ip->acl = dip->di_acl; /* as are dxd's */
3107 jfs_ip->ea = dip->di_ea;
3108 jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
3109 jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
3110 jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
3112 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
3113 jfs_ip->dev = le32_to_cpu(dip->di_rdev);
3114 ip->i_rdev = new_decode_dev(jfs_ip->dev);
3117 if (S_ISDIR(ip->i_mode)) {
3118 memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384);
3119 } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
3120 memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
3121 } else
3122 memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
3124 /* Zero the in-memory-only stuff */
3125 jfs_ip->cflag = 0;
3126 jfs_ip->btindex = 0;
3127 jfs_ip->btorder = 0;
3128 jfs_ip->bxflag = 0;
3129 jfs_ip->blid = 0;
3130 jfs_ip->atlhead = 0;
3131 jfs_ip->atltail = 0;
3132 jfs_ip->xtlid = 0;
3133 return (0);
3137 * NAME: copy_to_dinode()
3139 * FUNCTION: Copies inode info from in-memory inode to disk inode
3141 static void copy_to_dinode(struct dinode * dip, struct inode *ip)
3143 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3144 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3146 dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
3147 dip->di_inostamp = cpu_to_le32(sbi->inostamp);
3148 dip->di_number = cpu_to_le32(ip->i_ino);
3149 dip->di_gen = cpu_to_le32(ip->i_generation);
3150 dip->di_size = cpu_to_le64(ip->i_size);
3151 dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
3152 dip->di_nlink = cpu_to_le32(ip->i_nlink);
3153 if (sbi->uid == -1)
3154 dip->di_uid = cpu_to_le32(ip->i_uid);
3155 else
3156 dip->di_uid = cpu_to_le32(jfs_ip->saved_uid);
3157 if (sbi->gid == -1)
3158 dip->di_gid = cpu_to_le32(ip->i_gid);
3159 else
3160 dip->di_gid = cpu_to_le32(jfs_ip->saved_gid);
3161 jfs_get_inode_flags(jfs_ip);
3163 * mode2 is only needed for storing the higher order bits.
3164 * Trust i_mode for the lower order ones
3166 if (sbi->umask == -1)
3167 dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) |
3168 ip->i_mode);
3169 else /* Leave the original permissions alone */
3170 dip->di_mode = cpu_to_le32(jfs_ip->mode2);
3172 dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec);
3173 dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec);
3174 dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec);
3175 dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec);
3176 dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec);
3177 dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec);
3178 dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */
3179 dip->di_acl = jfs_ip->acl; /* as are dxd's */
3180 dip->di_ea = jfs_ip->ea;
3181 dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
3182 dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
3183 dip->di_otime.tv_nsec = 0;
3184 dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
3185 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
3186 dip->di_rdev = cpu_to_le32(jfs_ip->dev);