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Linux/fs/jfs/jfs_imap.c

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

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