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Linux/fs/jfs/jfs_imap.c

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  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, &amp))) {
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, &amp)))
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, &amp)))
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                                        &amp)))
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, &amp)))
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, &amp)))
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 }
3158 

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