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TOMOYO Linux Cross Reference
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 "
538                         "extent!");
539                 return;
540         }
541 
542         /* get the pointer to the disk inode of interest */
543         dp = (struct dinode *) (mp->data);
544         dp += inum % 8;         /* 8 inodes per 4K page */
545 
546         /* copy on-disk inode to in-memory inode */
547         copy_to_dinode(dp, ip);
548         memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
549 
550         if (inum == FILESYSTEM_I)
551                 dp->di_gengen = cpu_to_le32(sbi->gengen);
552 
553         /* write the page */
554         write_metapage(mp);
555 }
556 
557 /*
558  * NAME:        diFreeSpecial()
559  *
560  * FUNCTION:    Free allocated space for special inode
561  */
562 void diFreeSpecial(struct inode *ip)
563 {
564         if (ip == NULL) {
565                 jfs_err("diFreeSpecial called with NULL ip!");
566                 return;
567         }
568         filemap_write_and_wait(ip->i_mapping);
569         truncate_inode_pages(ip->i_mapping, 0);
570         iput(ip);
571 }
572 
573 
574 
575 /*
576  * NAME:        diWrite()
577  *
578  * FUNCTION:    write the on-disk inode portion of the in-memory inode
579  *              to its corresponding on-disk inode.
580  *
581  *              on entry, the specifed incore inode should itself
582  *              specify the disk inode number corresponding to the
583  *              incore inode (i.e. i_number should be initialized).
584  *
585  *              the inode contains the inode extent address for the disk
586  *              inode.  with the inode extent address in hand, the
587  *              page of the extent that contains the disk inode is
588  *              read and the disk inode portion of the incore inode
589  *              is copied to the disk inode.
590  *
591  * PARAMETERS:
592  *      tid -  transacation id
593  *      ip  -  pointer to incore inode to be written to the inode extent.
594  *
595  * RETURN VALUES:
596  *      0       - success
597  *      -EIO    - i/o error.
598  */
599 int diWrite(tid_t tid, struct inode *ip)
600 {
601         struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
602         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
603         int rc = 0;
604         s32 ino;
605         struct dinode *dp;
606         s64 blkno;
607         int block_offset;
608         int inodes_left;
609         struct metapage *mp;
610         unsigned long pageno;
611         int rel_inode;
612         int dioffset;
613         struct inode *ipimap;
614         uint type;
615         lid_t lid;
616         struct tlock *ditlck, *tlck;
617         struct linelock *dilinelock, *ilinelock;
618         struct lv *lv;
619         int n;
620 
621         ipimap = jfs_ip->ipimap;
622 
623         ino = ip->i_ino & (INOSPERIAG - 1);
624 
625         if (!addressPXD(&(jfs_ip->ixpxd)) ||
626             (lengthPXD(&(jfs_ip->ixpxd)) !=
627              JFS_IP(ipimap)->i_imap->im_nbperiext)) {
628                 jfs_error(ip->i_sb, "ixpxd invalid\n");
629                 return -EIO;
630         }
631 
632         /*
633          * read the page of disk inode containing the specified inode:
634          */
635         /* compute the block address of the page */
636         blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
637 
638         rel_inode = (ino & (INOSPERPAGE - 1));
639         pageno = blkno >> sbi->l2nbperpage;
640 
641         if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
642                 /*
643                  * OS/2 didn't always align inode extents on page boundaries
644                  */
645                 inodes_left =
646                     (sbi->nbperpage - block_offset) << sbi->l2niperblk;
647 
648                 if (rel_inode < inodes_left)
649                         rel_inode += block_offset << sbi->l2niperblk;
650                 else {
651                         pageno += 1;
652                         rel_inode -= inodes_left;
653                 }
654         }
655         /* read the page of disk inode */
656       retry:
657         mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
658         if (!mp)
659                 return -EIO;
660 
661         /* get the pointer to the disk inode */
662         dp = (struct dinode *) mp->data;
663         dp += rel_inode;
664 
665         dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
666 
667         /*
668          * acquire transaction lock on the on-disk inode;
669          * N.B. tlock is acquired on ipimap not ip;
670          */
671         if ((ditlck =
672              txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
673                 goto retry;
674         dilinelock = (struct linelock *) & ditlck->lock;
675 
676         /*
677          * copy btree root from in-memory inode to on-disk inode
678          *
679          * (tlock is taken from inline B+-tree root in in-memory
680          * inode when the B+-tree root is updated, which is pointed
681          * by jfs_ip->blid as well as being on tx tlock list)
682          *
683          * further processing of btree root is based on the copy
684          * in in-memory inode, where txLog() will log from, and,
685          * for xtree root, txUpdateMap() will update map and reset
686          * XAD_NEW bit;
687          */
688 
689         if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
690                 /*
691                  * This is the special xtree inside the directory for storing
692                  * the directory table
693                  */
694                 xtpage_t *p, *xp;
695                 xad_t *xad;
696 
697                 jfs_ip->xtlid = 0;
698                 tlck = lid_to_tlock(lid);
699                 assert(tlck->type & tlckXTREE);
700                 tlck->type |= tlckBTROOT;
701                 tlck->mp = mp;
702                 ilinelock = (struct linelock *) & tlck->lock;
703 
704                 /*
705                  * copy xtree root from inode to dinode:
706                  */
707                 p = &jfs_ip->i_xtroot;
708                 xp = (xtpage_t *) &dp->di_dirtable;
709                 lv = ilinelock->lv;
710                 for (n = 0; n < ilinelock->index; n++, lv++) {
711                         memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
712                                lv->length << L2XTSLOTSIZE);
713                 }
714 
715                 /* reset on-disk (metadata page) xtree XAD_NEW bit */
716                 xad = &xp->xad[XTENTRYSTART];
717                 for (n = XTENTRYSTART;
718                      n < le16_to_cpu(xp->header.nextindex); n++, xad++)
719                         if (xad->flag & (XAD_NEW | XAD_EXTENDED))
720                                 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
721         }
722 
723         if ((lid = jfs_ip->blid) == 0)
724                 goto inlineData;
725         jfs_ip->blid = 0;
726 
727         tlck = lid_to_tlock(lid);
728         type = tlck->type;
729         tlck->type |= tlckBTROOT;
730         tlck->mp = mp;
731         ilinelock = (struct linelock *) & tlck->lock;
732 
733         /*
734          *      regular file: 16 byte (XAD slot) granularity
735          */
736         if (type & tlckXTREE) {
737                 xtpage_t *p, *xp;
738                 xad_t *xad;
739 
740                 /*
741                  * copy xtree root from inode to dinode:
742                  */
743                 p = &jfs_ip->i_xtroot;
744                 xp = &dp->di_xtroot;
745                 lv = ilinelock->lv;
746                 for (n = 0; n < ilinelock->index; n++, lv++) {
747                         memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
748                                lv->length << L2XTSLOTSIZE);
749                 }
750 
751                 /* reset on-disk (metadata page) xtree XAD_NEW bit */
752                 xad = &xp->xad[XTENTRYSTART];
753                 for (n = XTENTRYSTART;
754                      n < le16_to_cpu(xp->header.nextindex); n++, xad++)
755                         if (xad->flag & (XAD_NEW | XAD_EXTENDED))
756                                 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
757         }
758         /*
759          *      directory: 32 byte (directory entry slot) granularity
760          */
761         else if (type & tlckDTREE) {
762                 dtpage_t *p, *xp;
763 
764                 /*
765                  * copy dtree root from inode to dinode:
766                  */
767                 p = (dtpage_t *) &jfs_ip->i_dtroot;
768                 xp = (dtpage_t *) & dp->di_dtroot;
769                 lv = ilinelock->lv;
770                 for (n = 0; n < ilinelock->index; n++, lv++) {
771                         memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
772                                lv->length << L2DTSLOTSIZE);
773                 }
774         } else {
775                 jfs_err("diWrite: UFO tlock");
776         }
777 
778       inlineData:
779         /*
780          * copy inline symlink from in-memory inode to on-disk inode
781          */
782         if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
783                 lv = & dilinelock->lv[dilinelock->index];
784                 lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
785                 lv->length = 2;
786                 memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
787                 dilinelock->index++;
788         }
789         /*
790          * copy inline data from in-memory inode to on-disk inode:
791          * 128 byte slot granularity
792          */
793         if (test_cflag(COMMIT_Inlineea, ip)) {
794                 lv = & dilinelock->lv[dilinelock->index];
795                 lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
796                 lv->length = 1;
797                 memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
798                 dilinelock->index++;
799 
800                 clear_cflag(COMMIT_Inlineea, ip);
801         }
802 
803         /*
804          *      lock/copy inode base: 128 byte slot granularity
805          */
806         lv = & dilinelock->lv[dilinelock->index];
807         lv->offset = dioffset >> L2INODESLOTSIZE;
808         copy_to_dinode(dp, ip);
809         if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
810                 lv->length = 2;
811                 memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
812         } else
813                 lv->length = 1;
814         dilinelock->index++;
815 
816         /* release the buffer holding the updated on-disk inode.
817          * the buffer will be later written by commit processing.
818          */
819         write_metapage(mp);
820 
821         return (rc);
822 }
823 
824 
825 /*
826  * NAME:        diFree(ip)
827  *
828  * FUNCTION:    free a specified inode from the inode working map
829  *              for a fileset or aggregate.
830  *
831  *              if the inode to be freed represents the first (only)
832  *              free inode within the iag, the iag will be placed on
833  *              the ag free inode list.
834  *
835  *              freeing the inode will cause the inode extent to be
836  *              freed if the inode is the only allocated inode within
837  *              the extent.  in this case all the disk resource backing
838  *              up the inode extent will be freed. in addition, the iag
839  *              will be placed on the ag extent free list if the extent
840  *              is the first free extent in the iag.  if freeing the
841  *              extent also means that no free inodes will exist for
842  *              the iag, the iag will also be removed from the ag free
843  *              inode list.
844  *
845  *              the iag describing the inode will be freed if the extent
846  *              is to be freed and it is the only backed extent within
847  *              the iag.  in this case, the iag will be removed from the
848  *              ag free extent list and ag free inode list and placed on
849  *              the inode map's free iag list.
850  *
851  *              a careful update approach is used to provide consistency
852  *              in the face of updates to multiple buffers.  under this
853  *              approach, all required buffers are obtained before making
854  *              any updates and are held until all updates are complete.
855  *
856  * PARAMETERS:
857  *      ip      - inode to be freed.
858  *
859  * RETURN VALUES:
860  *      0       - success
861  *      -EIO    - i/o error.
862  */
863 int diFree(struct inode *ip)
864 {
865         int rc;
866         ino_t inum = ip->i_ino;
867         struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
868         struct metapage *mp, *amp, *bmp, *cmp, *dmp;
869         int iagno, ino, extno, bitno, sword, agno;
870         int back, fwd;
871         u32 bitmap, mask;
872         struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
873         struct inomap *imap = JFS_IP(ipimap)->i_imap;
874         pxd_t freepxd;
875         tid_t tid;
876         struct inode *iplist[3];
877         struct tlock *tlck;
878         struct pxd_lock *pxdlock;
879 
880         /*
881          * This is just to suppress compiler warnings.  The same logic that
882          * references these variables is used to initialize them.
883          */
884         aiagp = biagp = ciagp = diagp = NULL;
885 
886         /* get the iag number containing the inode.
887          */
888         iagno = INOTOIAG(inum);
889 
890         /* make sure that the iag is contained within
891          * the map.
892          */
893         if (iagno >= imap->im_nextiag) {
894                 print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4,
895                                imap, 32, 0);
896                 jfs_error(ip->i_sb, "inum = %d, iagno = %d, nextiag = %d\n",
897                           (uint) inum, iagno, imap->im_nextiag);
898                 return -EIO;
899         }
900 
901         /* get the allocation group for this ino.
902          */
903         agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
904 
905         /* Lock the AG specific inode map information
906          */
907         AG_LOCK(imap, agno);
908 
909         /* Obtain read lock in imap inode.  Don't release it until we have
910          * read all of the IAG's that we are going to.
911          */
912         IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
913 
914         /* read the iag.
915          */
916         if ((rc = diIAGRead(imap, iagno, &mp))) {
917                 IREAD_UNLOCK(ipimap);
918                 AG_UNLOCK(imap, agno);
919                 return (rc);
920         }
921         iagp = (struct iag *) mp->data;
922 
923         /* get the inode number and extent number of the inode within
924          * the iag and the inode number within the extent.
925          */
926         ino = inum & (INOSPERIAG - 1);
927         extno = ino >> L2INOSPEREXT;
928         bitno = ino & (INOSPEREXT - 1);
929         mask = HIGHORDER >> bitno;
930 
931         if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
932                 jfs_error(ip->i_sb, "wmap shows inode already free\n");
933         }
934 
935         if (!addressPXD(&iagp->inoext[extno])) {
936                 release_metapage(mp);
937                 IREAD_UNLOCK(ipimap);
938                 AG_UNLOCK(imap, agno);
939                 jfs_error(ip->i_sb, "invalid inoext\n");
940                 return -EIO;
941         }
942 
943         /* compute the bitmap for the extent reflecting the freed inode.
944          */
945         bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
946 
947         if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
948                 release_metapage(mp);
949                 IREAD_UNLOCK(ipimap);
950                 AG_UNLOCK(imap, agno);
951                 jfs_error(ip->i_sb, "numfree > numinos\n");
952                 return -EIO;
953         }
954         /*
955          *      inode extent still has some inodes or below low water mark:
956          *      keep the inode extent;
957          */
958         if (bitmap ||
959             imap->im_agctl[agno].numfree < 96 ||
960             (imap->im_agctl[agno].numfree < 288 &&
961              (((imap->im_agctl[agno].numfree * 100) /
962                imap->im_agctl[agno].numinos) <= 25))) {
963                 /* if the iag currently has no free inodes (i.e.,
964                  * the inode being freed is the first free inode of iag),
965                  * insert the iag at head of the inode free list for the ag.
966                  */
967                 if (iagp->nfreeinos == 0) {
968                         /* check if there are any iags on the ag inode
969                          * free list.  if so, read the first one so that
970                          * we can link the current iag onto the list at
971                          * the head.
972                          */
973                         if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
974                                 /* read the iag that currently is the head
975                                  * of the list.
976                                  */
977                                 if ((rc = diIAGRead(imap, fwd, &amp))) {
978                                         IREAD_UNLOCK(ipimap);
979                                         AG_UNLOCK(imap, agno);
980                                         release_metapage(mp);
981                                         return (rc);
982                                 }
983                                 aiagp = (struct iag *) amp->data;
984 
985                                 /* make current head point back to the iag.
986                                  */
987                                 aiagp->inofreeback = cpu_to_le32(iagno);
988 
989                                 write_metapage(amp);
990                         }
991 
992                         /* iag points forward to current head and iag
993                          * becomes the new head of the list.
994                          */
995                         iagp->inofreefwd =
996                             cpu_to_le32(imap->im_agctl[agno].inofree);
997                         iagp->inofreeback = cpu_to_le32(-1);
998                         imap->im_agctl[agno].inofree = iagno;
999                 }
1000                 IREAD_UNLOCK(ipimap);
1001 
1002                 /* update the free inode summary map for the extent if
1003                  * freeing the inode means the extent will now have free
1004                  * inodes (i.e., the inode being freed is the first free
1005                  * inode of extent),
1006                  */
1007                 if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
1008                         sword = extno >> L2EXTSPERSUM;
1009                         bitno = extno & (EXTSPERSUM - 1);
1010                         iagp->inosmap[sword] &=
1011                             cpu_to_le32(~(HIGHORDER >> bitno));
1012                 }
1013 
1014                 /* update the bitmap.
1015                  */
1016                 iagp->wmap[extno] = cpu_to_le32(bitmap);
1017 
1018                 /* update the free inode counts at the iag, ag and
1019                  * map level.
1020                  */
1021                 le32_add_cpu(&iagp->nfreeinos, 1);
1022                 imap->im_agctl[agno].numfree += 1;
1023                 atomic_inc(&imap->im_numfree);
1024 
1025                 /* release the AG inode map lock
1026                  */
1027                 AG_UNLOCK(imap, agno);
1028 
1029                 /* write the iag */
1030                 write_metapage(mp);
1031 
1032                 return (0);
1033         }
1034 
1035 
1036         /*
1037          *      inode extent has become free and above low water mark:
1038          *      free the inode extent;
1039          */
1040 
1041         /*
1042          *      prepare to update iag list(s) (careful update step 1)
1043          */
1044         amp = bmp = cmp = dmp = NULL;
1045         fwd = back = -1;
1046 
1047         /* check if the iag currently has no free extents.  if so,
1048          * it will be placed on the head of the ag extent free list.
1049          */
1050         if (iagp->nfreeexts == 0) {
1051                 /* check if the ag extent free list has any iags.
1052                  * if so, read the iag at the head of the list now.
1053                  * this (head) iag will be updated later to reflect
1054                  * the addition of the current iag at the head of
1055                  * the list.
1056                  */
1057                 if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
1058                         if ((rc = diIAGRead(imap, fwd, &amp)))
1059                                 goto error_out;
1060                         aiagp = (struct iag *) amp->data;
1061                 }
1062         } else {
1063                 /* iag has free extents. check if the addition of a free
1064                  * extent will cause all extents to be free within this
1065                  * iag.  if so, the iag will be removed from the ag extent
1066                  * free list and placed on the inode map's free iag list.
1067                  */
1068                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1069                         /* in preparation for removing the iag from the
1070                          * ag extent free list, read the iags preceding
1071                          * and following the iag on the ag extent free
1072                          * list.
1073                          */
1074                         if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
1075                                 if ((rc = diIAGRead(imap, fwd, &amp)))
1076                                         goto error_out;
1077                                 aiagp = (struct iag *) amp->data;
1078                         }
1079 
1080                         if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
1081                                 if ((rc = diIAGRead(imap, back, &bmp)))
1082                                         goto error_out;
1083                                 biagp = (struct iag *) bmp->data;
1084                         }
1085                 }
1086         }
1087 
1088         /* remove the iag from the ag inode free list if freeing
1089          * this extent cause the iag to have no free inodes.
1090          */
1091         if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1092                 int inofreeback = le32_to_cpu(iagp->inofreeback);
1093                 int inofreefwd = le32_to_cpu(iagp->inofreefwd);
1094 
1095                 /* in preparation for removing the iag from the
1096                  * ag inode free list, read the iags preceding
1097                  * and following the iag on the ag inode free
1098                  * list.  before reading these iags, we must make
1099                  * sure that we already don't have them in hand
1100                  * from up above, since re-reading an iag (buffer)
1101                  * we are currently holding would cause a deadlock.
1102                  */
1103                 if (inofreefwd >= 0) {
1104 
1105                         if (inofreefwd == fwd)
1106                                 ciagp = (struct iag *) amp->data;
1107                         else if (inofreefwd == back)
1108                                 ciagp = (struct iag *) bmp->data;
1109                         else {
1110                                 if ((rc =
1111                                      diIAGRead(imap, inofreefwd, &cmp)))
1112                                         goto error_out;
1113                                 ciagp = (struct iag *) cmp->data;
1114                         }
1115                         assert(ciagp != NULL);
1116                 }
1117 
1118                 if (inofreeback >= 0) {
1119                         if (inofreeback == fwd)
1120                                 diagp = (struct iag *) amp->data;
1121                         else if (inofreeback == back)
1122                                 diagp = (struct iag *) bmp->data;
1123                         else {
1124                                 if ((rc =
1125                                      diIAGRead(imap, inofreeback, &dmp)))
1126                                         goto error_out;
1127                                 diagp = (struct iag *) dmp->data;
1128                         }
1129                         assert(diagp != NULL);
1130                 }
1131         }
1132 
1133         IREAD_UNLOCK(ipimap);
1134 
1135         /*
1136          * invalidate any page of the inode extent freed from buffer cache;
1137          */
1138         freepxd = iagp->inoext[extno];
1139         invalidate_pxd_metapages(ip, freepxd);
1140 
1141         /*
1142          *      update iag list(s) (careful update step 2)
1143          */
1144         /* add the iag to the ag extent free list if this is the
1145          * first free extent for the iag.
1146          */
1147         if (iagp->nfreeexts == 0) {
1148                 if (fwd >= 0)
1149                         aiagp->extfreeback = cpu_to_le32(iagno);
1150 
1151                 iagp->extfreefwd =
1152                     cpu_to_le32(imap->im_agctl[agno].extfree);
1153                 iagp->extfreeback = cpu_to_le32(-1);
1154                 imap->im_agctl[agno].extfree = iagno;
1155         } else {
1156                 /* remove the iag from the ag extent list if all extents
1157                  * are now free and place it on the inode map iag free list.
1158                  */
1159                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
1160                         if (fwd >= 0)
1161                                 aiagp->extfreeback = iagp->extfreeback;
1162 
1163                         if (back >= 0)
1164                                 biagp->extfreefwd = iagp->extfreefwd;
1165                         else
1166                                 imap->im_agctl[agno].extfree =
1167                                     le32_to_cpu(iagp->extfreefwd);
1168 
1169                         iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
1170 
1171                         IAGFREE_LOCK(imap);
1172                         iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1173                         imap->im_freeiag = iagno;
1174                         IAGFREE_UNLOCK(imap);
1175                 }
1176         }
1177 
1178         /* remove the iag from the ag inode free list if freeing
1179          * this extent causes the iag to have no free inodes.
1180          */
1181         if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
1182                 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
1183                         ciagp->inofreeback = iagp->inofreeback;
1184 
1185                 if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
1186                         diagp->inofreefwd = iagp->inofreefwd;
1187                 else
1188                         imap->im_agctl[agno].inofree =
1189                             le32_to_cpu(iagp->inofreefwd);
1190 
1191                 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
1192         }
1193 
1194         /* update the inode extent address and working map
1195          * to reflect the free extent.
1196          * the permanent map should have been updated already
1197          * for the inode being freed.
1198          */
1199         if (iagp->pmap[extno] != 0) {
1200                 jfs_error(ip->i_sb, "the pmap does not show inode free\n");
1201         }
1202         iagp->wmap[extno] = 0;
1203         PXDlength(&iagp->inoext[extno], 0);
1204         PXDaddress(&iagp->inoext[extno], 0);
1205 
1206         /* update the free extent and free inode summary maps
1207          * to reflect the freed extent.
1208          * the inode summary map is marked to indicate no inodes
1209          * available for the freed extent.
1210          */
1211         sword = extno >> L2EXTSPERSUM;
1212         bitno = extno & (EXTSPERSUM - 1);
1213         mask = HIGHORDER >> bitno;
1214         iagp->inosmap[sword] |= cpu_to_le32(mask);
1215         iagp->extsmap[sword] &= cpu_to_le32(~mask);
1216 
1217         /* update the number of free inodes and number of free extents
1218          * for the iag.
1219          */
1220         le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1));
1221         le32_add_cpu(&iagp->nfreeexts, 1);
1222 
1223         /* update the number of free inodes and backed inodes
1224          * at the ag and inode map level.
1225          */
1226         imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
1227         imap->im_agctl[agno].numinos -= INOSPEREXT;
1228         atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
1229         atomic_sub(INOSPEREXT, &imap->im_numinos);
1230 
1231         if (amp)
1232                 write_metapage(amp);
1233         if (bmp)
1234                 write_metapage(bmp);
1235         if (cmp)
1236                 write_metapage(cmp);
1237         if (dmp)
1238                 write_metapage(dmp);
1239 
1240         /*
1241          * start transaction to update block allocation map
1242          * for the inode extent freed;
1243          *
1244          * N.B. AG_LOCK is released and iag will be released below, and
1245          * other thread may allocate inode from/reusing the ixad freed
1246          * BUT with new/different backing inode extent from the extent
1247          * to be freed by the transaction;
1248          */
1249         tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
1250         mutex_lock(&JFS_IP(ipimap)->commit_mutex);
1251 
1252         /* acquire tlock of the iag page of the freed ixad
1253          * to force the page NOHOMEOK (even though no data is
1254          * logged from the iag page) until NOREDOPAGE|FREEXTENT log
1255          * for the free of the extent is committed;
1256          * write FREEXTENT|NOREDOPAGE log record
1257          * N.B. linelock is overlaid as freed extent descriptor;
1258          */
1259         tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
1260         pxdlock = (struct pxd_lock *) & tlck->lock;
1261         pxdlock->flag = mlckFREEPXD;
1262         pxdlock->pxd = freepxd;
1263         pxdlock->index = 1;
1264 
1265         write_metapage(mp);
1266 
1267         iplist[0] = ipimap;
1268 
1269         /*
1270          * logredo needs the IAG number and IAG extent index in order
1271          * to ensure that the IMap is consistent.  The least disruptive
1272          * way to pass these values through  to the transaction manager
1273          * is in the iplist array.
1274          *
1275          * It's not pretty, but it works.
1276          */
1277         iplist[1] = (struct inode *) (size_t)iagno;
1278         iplist[2] = (struct inode *) (size_t)extno;
1279 
1280         rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
1281 
1282         txEnd(tid);
1283         mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
1284 
1285         /* unlock the AG inode map information */
1286         AG_UNLOCK(imap, agno);
1287 
1288         return (0);
1289 
1290       error_out:
1291         IREAD_UNLOCK(ipimap);
1292 
1293         if (amp)
1294                 release_metapage(amp);
1295         if (bmp)
1296                 release_metapage(bmp);
1297         if (cmp)
1298                 release_metapage(cmp);
1299         if (dmp)
1300                 release_metapage(dmp);
1301 
1302         AG_UNLOCK(imap, agno);
1303 
1304         release_metapage(mp);
1305 
1306         return (rc);
1307 }
1308 
1309 /*
1310  * There are several places in the diAlloc* routines where we initialize
1311  * the inode.
1312  */
1313 static inline void
1314 diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
1315 {
1316         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
1317 
1318         ip->i_ino = (iagno << L2INOSPERIAG) + ino;
1319         jfs_ip->ixpxd = iagp->inoext[extno];
1320         jfs_ip->agstart = le64_to_cpu(iagp->agstart);
1321         jfs_ip->active_ag = -1;
1322 }
1323 
1324 
1325 /*
1326  * NAME:        diAlloc(pip,dir,ip)
1327  *
1328  * FUNCTION:    allocate a disk inode from the inode working map
1329  *              for a fileset or aggregate.
1330  *
1331  * PARAMETERS:
1332  *      pip     - pointer to incore inode for the parent inode.
1333  *      dir     - 'true' if the new disk inode is for a directory.
1334  *      ip      - pointer to a new inode
1335  *
1336  * RETURN VALUES:
1337  *      0       - success.
1338  *      -ENOSPC - insufficient disk resources.
1339  *      -EIO    - i/o error.
1340  */
1341 int diAlloc(struct inode *pip, bool dir, struct inode *ip)
1342 {
1343         int rc, ino, iagno, addext, extno, bitno, sword;
1344         int nwords, rem, i, agno;
1345         u32 mask, inosmap, extsmap;
1346         struct inode *ipimap;
1347         struct metapage *mp;
1348         ino_t inum;
1349         struct iag *iagp;
1350         struct inomap *imap;
1351 
1352         /* get the pointers to the inode map inode and the
1353          * corresponding imap control structure.
1354          */
1355         ipimap = JFS_SBI(pip->i_sb)->ipimap;
1356         imap = JFS_IP(ipimap)->i_imap;
1357         JFS_IP(ip)->ipimap = ipimap;
1358         JFS_IP(ip)->fileset = FILESYSTEM_I;
1359 
1360         /* for a directory, the allocation policy is to start
1361          * at the ag level using the preferred ag.
1362          */
1363         if (dir) {
1364                 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1365                 AG_LOCK(imap, agno);
1366                 goto tryag;
1367         }
1368 
1369         /* for files, the policy starts off by trying to allocate from
1370          * the same iag containing the parent disk inode:
1371          * try to allocate the new disk inode close to the parent disk
1372          * inode, using parent disk inode number + 1 as the allocation
1373          * hint.  (we use a left-to-right policy to attempt to avoid
1374          * moving backward on the disk.)  compute the hint within the
1375          * file system and the iag.
1376          */
1377 
1378         /* get the ag number of this iag */
1379         agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
1380 
1381         if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
1382                 /*
1383                  * There is an open file actively growing.  We want to
1384                  * allocate new inodes from a different ag to avoid
1385                  * fragmentation problems.
1386                  */
1387                 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
1388                 AG_LOCK(imap, agno);
1389                 goto tryag;
1390         }
1391 
1392         inum = pip->i_ino + 1;
1393         ino = inum & (INOSPERIAG - 1);
1394 
1395         /* back off the hint if it is outside of the iag */
1396         if (ino == 0)
1397                 inum = pip->i_ino;
1398 
1399         /* lock the AG inode map information */
1400         AG_LOCK(imap, agno);
1401 
1402         /* Get read lock on imap inode */
1403         IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
1404 
1405         /* get the iag number and read the iag */
1406         iagno = INOTOIAG(inum);
1407         if ((rc = diIAGRead(imap, iagno, &mp))) {
1408                 IREAD_UNLOCK(ipimap);
1409                 AG_UNLOCK(imap, agno);
1410                 return (rc);
1411         }
1412         iagp = (struct iag *) mp->data;
1413 
1414         /* determine if new inode extent is allowed to be added to the iag.
1415          * new inode extent can be added to the iag if the ag
1416          * has less than 32 free disk inodes and the iag has free extents.
1417          */
1418         addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
1419 
1420         /*
1421          *      try to allocate from the IAG
1422          */
1423         /* check if the inode may be allocated from the iag
1424          * (i.e. the inode has free inodes or new extent can be added).
1425          */
1426         if (iagp->nfreeinos || addext) {
1427                 /* determine the extent number of the hint.
1428                  */
1429                 extno = ino >> L2INOSPEREXT;
1430 
1431                 /* check if the extent containing the hint has backed
1432                  * inodes.  if so, try to allocate within this extent.
1433                  */
1434                 if (addressPXD(&iagp->inoext[extno])) {
1435                         bitno = ino & (INOSPEREXT - 1);
1436                         if ((bitno =
1437                              diFindFree(le32_to_cpu(iagp->wmap[extno]),
1438                                         bitno))
1439                             < INOSPEREXT) {
1440                                 ino = (extno << L2INOSPEREXT) + bitno;
1441 
1442                                 /* a free inode (bit) was found within this
1443                                  * extent, so allocate it.
1444                                  */
1445                                 rc = diAllocBit(imap, iagp, ino);
1446                                 IREAD_UNLOCK(ipimap);
1447                                 if (rc) {
1448                                         assert(rc == -EIO);
1449                                 } else {
1450                                         /* set the results of the allocation
1451                                          * and write the iag.
1452                                          */
1453                                         diInitInode(ip, iagno, ino, extno,
1454                                                     iagp);
1455                                         mark_metapage_dirty(mp);
1456                                 }
1457                                 release_metapage(mp);
1458 
1459                                 /* free the AG lock and return.
1460                                  */
1461                                 AG_UNLOCK(imap, agno);
1462                                 return (rc);
1463                         }
1464 
1465                         if (!addext)
1466                                 extno =
1467                                     (extno ==
1468                                      EXTSPERIAG - 1) ? 0 : extno + 1;
1469                 }
1470 
1471                 /*
1472                  * no free inodes within the extent containing the hint.
1473                  *
1474                  * try to allocate from the backed extents following
1475                  * hint or, if appropriate (i.e. addext is true), allocate
1476                  * an extent of free inodes at or following the extent
1477                  * containing the hint.
1478                  *
1479                  * the free inode and free extent summary maps are used
1480                  * here, so determine the starting summary map position
1481                  * and the number of words we'll have to examine.  again,
1482                  * the approach is to allocate following the hint, so we
1483                  * might have to initially ignore prior bits of the summary
1484                  * map that represent extents prior to the extent containing
1485                  * the hint and later revisit these bits.
1486                  */
1487                 bitno = extno & (EXTSPERSUM - 1);
1488                 nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
1489                 sword = extno >> L2EXTSPERSUM;
1490 
1491                 /* mask any prior bits for the starting words of the
1492                  * summary map.
1493                  */
1494                 mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno));
1495                 inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
1496                 extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
1497 
1498                 /* scan the free inode and free extent summary maps for
1499                  * free resources.
1500                  */
1501                 for (i = 0; i < nwords; i++) {
1502                         /* check if this word of the free inode summary
1503                          * map describes an extent with free inodes.
1504                          */
1505                         if (~inosmap) {
1506                                 /* an extent with free inodes has been
1507                                  * found. determine the extent number
1508                                  * and the inode number within the extent.
1509                                  */
1510                                 rem = diFindFree(inosmap, 0);
1511                                 extno = (sword << L2EXTSPERSUM) + rem;
1512                                 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
1513                                                  0);
1514                                 if (rem >= INOSPEREXT) {
1515                                         IREAD_UNLOCK(ipimap);
1516                                         release_metapage(mp);
1517                                         AG_UNLOCK(imap, agno);
1518                                         jfs_error(ip->i_sb,
1519                                                   "can't find free bit in wmap\n");
1520                                         return -EIO;
1521                                 }
1522 
1523                                 /* determine the inode number within the
1524                                  * iag and allocate the inode from the
1525                                  * map.
1526                                  */
1527                                 ino = (extno << L2INOSPEREXT) + rem;
1528                                 rc = diAllocBit(imap, iagp, ino);
1529                                 IREAD_UNLOCK(ipimap);
1530                                 if (rc)
1531                                         assert(rc == -EIO);
1532                                 else {
1533                                         /* set the results of the allocation
1534                                          * and write the iag.
1535                                          */
1536                                         diInitInode(ip, iagno, ino, extno,
1537                                                     iagp);
1538                                         mark_metapage_dirty(mp);
1539                                 }
1540                                 release_metapage(mp);
1541 
1542                                 /* free the AG lock and return.
1543                                  */
1544                                 AG_UNLOCK(imap, agno);
1545                                 return (rc);
1546 
1547                         }
1548 
1549                         /* check if we may allocate an extent of free
1550                          * inodes and whether this word of the free
1551                          * extents summary map describes a free extent.
1552                          */
1553                         if (addext && ~extsmap) {
1554                                 /* a free extent has been found.  determine
1555                                  * the extent number.
1556                                  */
1557                                 rem = diFindFree(extsmap, 0);
1558                                 extno = (sword << L2EXTSPERSUM) + rem;
1559 
1560                                 /* allocate an extent of free inodes.
1561                                  */
1562                                 if ((rc = diNewExt(imap, iagp, extno))) {
1563                                         /* if there is no disk space for a
1564                                          * new extent, try to allocate the
1565                                          * disk inode from somewhere else.
1566                                          */
1567                                         if (rc == -ENOSPC)
1568                                                 break;
1569 
1570                                         assert(rc == -EIO);
1571                                 } else {
1572                                         /* set the results of the allocation
1573                                          * and write the iag.
1574                                          */
1575                                         diInitInode(ip, iagno,
1576                                                     extno << L2INOSPEREXT,
1577                                                     extno, iagp);
1578                                         mark_metapage_dirty(mp);
1579                                 }
1580                                 release_metapage(mp);
1581                                 /* free the imap inode & the AG lock & return.
1582                                  */
1583                                 IREAD_UNLOCK(ipimap);
1584                                 AG_UNLOCK(imap, agno);
1585                                 return (rc);
1586                         }
1587 
1588                         /* move on to the next set of summary map words.
1589                          */
1590                         sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
1591                         inosmap = le32_to_cpu(iagp->inosmap[sword]);
1592                         extsmap = le32_to_cpu(iagp->extsmap[sword]);
1593                 }
1594         }
1595         /* unlock imap inode */
1596         IREAD_UNLOCK(ipimap);
1597 
1598         /* nothing doing in this iag, so release it. */
1599         release_metapage(mp);
1600 
1601       tryag:
1602         /*
1603          * try to allocate anywhere within the same AG as the parent inode.
1604          */
1605         rc = diAllocAG(imap, agno, dir, ip);
1606 
1607         AG_UNLOCK(imap, agno);
1608 
1609         if (rc != -ENOSPC)
1610                 return (rc);
1611 
1612         /*
1613          * try to allocate in any AG.
1614          */
1615         return (diAllocAny(imap, agno, dir, ip));
1616 }
1617 
1618 
1619 /*
1620  * NAME:        diAllocAG(imap,agno,dir,ip)
1621  *
1622  * FUNCTION:    allocate a disk inode from the allocation group.
1623  *
1624  *              this routine first determines if a new extent of free
1625  *              inodes should be added for the allocation group, with
1626  *              the current request satisfied from this extent. if this
1627  *              is the case, an attempt will be made to do just that.  if
1628  *              this attempt fails or it has been determined that a new
1629  *              extent should not be added, an attempt is made to satisfy
1630  *              the request by allocating an existing (backed) free inode
1631  *              from the allocation group.
1632  *
1633  * PRE CONDITION: Already have the AG lock for this AG.
1634  *
1635  * PARAMETERS:
1636  *      imap    - pointer to inode map control structure.
1637  *      agno    - allocation group to allocate from.
1638  *      dir     - 'true' if the new disk inode is for a directory.
1639  *      ip      - pointer to the new inode to be filled in on successful return
1640  *                with the disk inode number allocated, its extent address
1641  *                and the start of the ag.
1642  *
1643  * RETURN VALUES:
1644  *      0       - success.
1645  *      -ENOSPC - insufficient disk resources.
1646  *      -EIO    - i/o error.
1647  */
1648 static int
1649 diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
1650 {
1651         int rc, addext, numfree, numinos;
1652 
1653         /* get the number of free and the number of backed disk
1654          * inodes currently within the ag.
1655          */
1656         numfree = imap->im_agctl[agno].numfree;
1657         numinos = imap->im_agctl[agno].numinos;
1658 
1659         if (numfree > numinos) {
1660                 jfs_error(ip->i_sb, "numfree > numinos\n");
1661                 return -EIO;
1662         }
1663 
1664         /* determine if we should allocate a new extent of free inodes
1665          * within the ag: for directory inodes, add a new extent
1666          * if there are a small number of free inodes or number of free
1667          * inodes is a small percentage of the number of backed inodes.
1668          */
1669         if (dir)
1670                 addext = (numfree < 64 ||
1671                           (numfree < 256
1672                            && ((numfree * 100) / numinos) <= 20));
1673         else
1674                 addext = (numfree == 0);
1675 
1676         /*
1677          * try to allocate a new extent of free inodes.
1678          */
1679         if (addext) {
1680                 /* if free space is not available for this new extent, try
1681                  * below to allocate a free and existing (already backed)
1682                  * inode from the ag.
1683                  */
1684                 if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
1685                         return (rc);
1686         }
1687 
1688         /*
1689          * try to allocate an existing free inode from the ag.
1690          */
1691         return (diAllocIno(imap, agno, ip));
1692 }
1693 
1694 
1695 /*
1696  * NAME:        diAllocAny(imap,agno,dir,iap)
1697  *
1698  * FUNCTION:    allocate a disk inode from any other allocation group.
1699  *
1700  *              this routine is called when an allocation attempt within
1701  *              the primary allocation group has failed. if attempts to
1702  *              allocate an inode from any allocation group other than the
1703  *              specified primary group.
1704  *
1705  * PARAMETERS:
1706  *      imap    - pointer to inode map control structure.
1707  *      agno    - primary allocation group (to avoid).
1708  *      dir     - 'true' if the new disk inode is for a directory.
1709  *      ip      - pointer to a new inode to be filled in on successful return
1710  *                with the disk inode number allocated, its extent address
1711  *                and the start of the ag.
1712  *
1713  * RETURN VALUES:
1714  *      0       - success.
1715  *      -ENOSPC - insufficient disk resources.
1716  *      -EIO    - i/o error.
1717  */
1718 static int
1719 diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
1720 {
1721         int ag, rc;
1722         int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;
1723 
1724 
1725         /* try to allocate from the ags following agno up to
1726          * the maximum ag number.
1727          */
1728         for (ag = agno + 1; ag <= maxag; ag++) {
1729                 AG_LOCK(imap, ag);
1730 
1731                 rc = diAllocAG(imap, ag, dir, ip);
1732 
1733                 AG_UNLOCK(imap, ag);
1734 
1735                 if (rc != -ENOSPC)
1736                         return (rc);
1737         }
1738 
1739         /* try to allocate from the ags in front of agno.
1740          */
1741         for (ag = 0; ag < agno; ag++) {
1742                 AG_LOCK(imap, ag);
1743 
1744                 rc = diAllocAG(imap, ag, dir, ip);
1745 
1746                 AG_UNLOCK(imap, ag);
1747 
1748                 if (rc != -ENOSPC)
1749                         return (rc);
1750         }
1751 
1752         /* no free disk inodes.
1753          */
1754         return -ENOSPC;
1755 }
1756 
1757 
1758 /*
1759  * NAME:        diAllocIno(imap,agno,ip)
1760  *
1761  * FUNCTION:    allocate a disk inode from the allocation group's free
1762  *              inode list, returning an error if this free list is
1763  *              empty (i.e. no iags on the list).
1764  *
1765  *              allocation occurs from the first iag on the list using
1766  *              the iag's free inode summary map to find the leftmost
1767  *              free inode in the iag.
1768  *
1769  * PRE CONDITION: Already have AG lock for this AG.
1770  *
1771  * PARAMETERS:
1772  *      imap    - pointer to inode map control structure.
1773  *      agno    - allocation group.
1774  *      ip      - pointer to new inode to be filled in on successful return
1775  *                with the disk inode number allocated, its extent address
1776  *                and the start of the ag.
1777  *
1778  * RETURN VALUES:
1779  *      0       - success.
1780  *      -ENOSPC - insufficient disk resources.
1781  *      -EIO    - i/o error.
1782  */
1783 static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
1784 {
1785         int iagno, ino, rc, rem, extno, sword;
1786         struct metapage *mp;
1787         struct iag *iagp;
1788 
1789         /* check if there are iags on the ag's free inode list.
1790          */
1791         if ((iagno = imap->im_agctl[agno].inofree) < 0)
1792                 return -ENOSPC;
1793 
1794         /* obtain read lock on imap inode */
1795         IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1796 
1797         /* read the iag at the head of the list.
1798          */
1799         if ((rc = diIAGRead(imap, iagno, &mp))) {
1800                 IREAD_UNLOCK(imap->im_ipimap);
1801                 return (rc);
1802         }
1803         iagp = (struct iag *) mp->data;
1804 
1805         /* better be free inodes in this iag if it is on the
1806          * list.
1807          */
1808         if (!iagp->nfreeinos) {
1809                 IREAD_UNLOCK(imap->im_ipimap);
1810                 release_metapage(mp);
1811                 jfs_error(ip->i_sb, "nfreeinos = 0, but iag on freelist\n");
1812                 return -EIO;
1813         }
1814 
1815         /* scan the free inode summary map to find an extent
1816          * with free inodes.
1817          */
1818         for (sword = 0;; sword++) {
1819                 if (sword >= SMAPSZ) {
1820                         IREAD_UNLOCK(imap->im_ipimap);
1821                         release_metapage(mp);
1822                         jfs_error(ip->i_sb,
1823                                   "free inode not found in summary map\n");
1824                         return -EIO;
1825                 }
1826 
1827                 if (~iagp->inosmap[sword])
1828                         break;
1829         }
1830 
1831         /* found a extent with free inodes. determine
1832          * the extent number.
1833          */
1834         rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
1835         if (rem >= EXTSPERSUM) {
1836                 IREAD_UNLOCK(imap->im_ipimap);
1837                 release_metapage(mp);
1838                 jfs_error(ip->i_sb, "no free extent found\n");
1839                 return -EIO;
1840         }
1841         extno = (sword << L2EXTSPERSUM) + rem;
1842 
1843         /* find the first free inode in the extent.
1844          */
1845         rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
1846         if (rem >= INOSPEREXT) {
1847                 IREAD_UNLOCK(imap->im_ipimap);
1848                 release_metapage(mp);
1849                 jfs_error(ip->i_sb, "free inode not found\n");
1850                 return -EIO;
1851         }
1852 
1853         /* compute the inode number within the iag.
1854          */
1855         ino = (extno << L2INOSPEREXT) + rem;
1856 
1857         /* allocate the inode.
1858          */
1859         rc = diAllocBit(imap, iagp, ino);
1860         IREAD_UNLOCK(imap->im_ipimap);
1861         if (rc) {
1862                 release_metapage(mp);
1863                 return (rc);
1864         }
1865 
1866         /* set the results of the allocation and write the iag.
1867          */
1868         diInitInode(ip, iagno, ino, extno, iagp);
1869         write_metapage(mp);
1870 
1871         return (0);
1872 }
1873 
1874 
1875 /*
1876  * NAME:        diAllocExt(imap,agno,ip)
1877  *
1878  * FUNCTION:    add a new extent of free inodes to an iag, allocating
1879  *              an inode from this extent to satisfy the current allocation
1880  *              request.
1881  *
1882  *              this routine first tries to find an existing iag with free
1883  *              extents through the ag free extent list.  if list is not
1884  *              empty, the head of the list will be selected as the home
1885  *              of the new extent of free inodes.  otherwise (the list is
1886  *              empty), a new iag will be allocated for the ag to contain
1887  *              the extent.
1888  *
1889  *              once an iag has been selected, the free extent summary map
1890  *              is used to locate a free extent within the iag and diNewExt()
1891  *              is called to initialize the extent, with initialization
1892  *              including the allocation of the first inode of the extent
1893  *              for the purpose of satisfying this request.
1894  *
1895  * PARAMETERS:
1896  *      imap    - pointer to inode map control structure.
1897  *      agno    - allocation group number.
1898  *      ip      - pointer to new inode to be filled in on successful return
1899  *                with the disk inode number allocated, its extent address
1900  *                and the start of the ag.
1901  *
1902  * RETURN VALUES:
1903  *      0       - success.
1904  *      -ENOSPC - insufficient disk resources.
1905  *      -EIO    - i/o error.
1906  */
1907 static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
1908 {
1909         int rem, iagno, sword, extno, rc;
1910         struct metapage *mp;
1911         struct iag *iagp;
1912 
1913         /* check if the ag has any iags with free extents.  if not,
1914          * allocate a new iag for the ag.
1915          */
1916         if ((iagno = imap->im_agctl[agno].extfree) < 0) {
1917                 /* If successful, diNewIAG will obtain the read lock on the
1918                  * imap inode.
1919                  */
1920                 if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
1921                         return (rc);
1922                 }
1923                 iagp = (struct iag *) mp->data;
1924 
1925                 /* set the ag number if this a brand new iag
1926                  */
1927                 iagp->agstart =
1928                     cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
1929         } else {
1930                 /* read the iag.
1931                  */
1932                 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
1933                 if ((rc = diIAGRead(imap, iagno, &mp))) {
1934                         IREAD_UNLOCK(imap->im_ipimap);
1935                         jfs_error(ip->i_sb, "error reading iag\n");
1936                         return rc;
1937                 }
1938                 iagp = (struct iag *) mp->data;
1939         }
1940 
1941         /* using the free extent summary map, find a free extent.
1942          */
1943         for (sword = 0;; sword++) {
1944                 if (sword >= SMAPSZ) {
1945                         release_metapage(mp);
1946                         IREAD_UNLOCK(imap->im_ipimap);
1947                         jfs_error(ip->i_sb, "free ext summary map not found\n");
1948                         return -EIO;
1949                 }
1950                 if (~iagp->extsmap[sword])
1951                         break;
1952         }
1953 
1954         /* determine the extent number of the free extent.
1955          */
1956         rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
1957         if (rem >= EXTSPERSUM) {
1958                 release_metapage(mp);
1959                 IREAD_UNLOCK(imap->im_ipimap);
1960                 jfs_error(ip->i_sb, "free extent not found\n");
1961                 return -EIO;
1962         }
1963         extno = (sword << L2EXTSPERSUM) + rem;
1964 
1965         /* initialize the new extent.
1966          */
1967         rc = diNewExt(imap, iagp, extno);
1968         IREAD_UNLOCK(imap->im_ipimap);
1969         if (rc) {
1970                 /* something bad happened.  if a new iag was allocated,
1971                  * place it back on the inode map's iag free list, and
1972                  * clear the ag number information.
1973                  */
1974                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
1975                         IAGFREE_LOCK(imap);
1976                         iagp->iagfree = cpu_to_le32(imap->im_freeiag);
1977                         imap->im_freeiag = iagno;
1978                         IAGFREE_UNLOCK(imap);
1979                 }
1980                 write_metapage(mp);
1981                 return (rc);
1982         }
1983 
1984         /* set the results of the allocation and write the iag.
1985          */
1986         diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp);
1987 
1988         write_metapage(mp);
1989 
1990         return (0);
1991 }
1992 
1993 
1994 /*
1995  * NAME:        diAllocBit(imap,iagp,ino)
1996  *
1997  * FUNCTION:    allocate a backed inode from an iag.
1998  *
1999  *              this routine performs the mechanics of allocating a
2000  *              specified inode from a backed extent.
2001  *
2002  *              if the inode to be allocated represents the last free
2003  *              inode within the iag, the iag will be removed from the
2004  *              ag free inode list.
2005  *
2006  *              a careful update approach is used to provide consistency
2007  *              in the face of updates to multiple buffers.  under this
2008  *              approach, all required buffers are obtained before making
2009  *              any updates and are held all are updates are complete.
2010  *
2011  * PRE CONDITION: Already have buffer lock on iagp.  Already have AG lock on
2012  *      this AG.  Must have read lock on imap inode.
2013  *
2014  * PARAMETERS:
2015  *      imap    - pointer to inode map control structure.
2016  *      iagp    - pointer to iag.
2017  *      ino     - inode number to be allocated within the iag.
2018  *
2019  * RETURN VALUES:
2020  *      0       - success.
2021  *      -ENOSPC - insufficient disk resources.
2022  *      -EIO    - i/o error.
2023  */
2024 static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
2025 {
2026         int extno, bitno, agno, sword, rc;
2027         struct metapage *amp = NULL, *bmp = NULL;
2028         struct iag *aiagp = NULL, *biagp = NULL;
2029         u32 mask;
2030 
2031         /* check if this is the last free inode within the iag.
2032          * if so, it will have to be removed from the ag free
2033          * inode list, so get the iags preceding and following
2034          * it on the list.
2035          */
2036         if (iagp->nfreeinos == cpu_to_le32(1)) {
2037                 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
2038                         if ((rc =
2039                              diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
2040                                        &amp)))
2041                                 return (rc);
2042                         aiagp = (struct iag *) amp->data;
2043                 }
2044 
2045                 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
2046                         if ((rc =
2047                              diIAGRead(imap,
2048                                        le32_to_cpu(iagp->inofreeback),
2049                                        &bmp))) {
2050                                 if (amp)
2051                                         release_metapage(amp);
2052                                 return (rc);
2053                         }
2054                         biagp = (struct iag *) bmp->data;
2055                 }
2056         }
2057 
2058         /* get the ag number, extent number, inode number within
2059          * the extent.
2060          */
2061         agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
2062         extno = ino >> L2INOSPEREXT;
2063         bitno = ino & (INOSPEREXT - 1);
2064 
2065         /* compute the mask for setting the map.
2066          */
2067         mask = HIGHORDER >> bitno;
2068 
2069         /* the inode should be free and backed.
2070          */
2071         if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
2072             ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
2073             (addressPXD(&iagp->inoext[extno]) == 0)) {
2074                 if (amp)
2075                         release_metapage(amp);
2076                 if (bmp)
2077                         release_metapage(bmp);
2078 
2079                 jfs_error(imap->im_ipimap->i_sb, "iag inconsistent\n");
2080                 return -EIO;
2081         }
2082 
2083         /* mark the inode as allocated in the working map.
2084          */
2085         iagp->wmap[extno] |= cpu_to_le32(mask);
2086 
2087         /* check if all inodes within the extent are now
2088          * allocated.  if so, update the free inode summary
2089          * map to reflect this.
2090          */
2091         if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
2092                 sword = extno >> L2EXTSPERSUM;
2093                 bitno = extno & (EXTSPERSUM - 1);
2094                 iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
2095         }
2096 
2097         /* if this was the last free inode in the iag, remove the
2098          * iag from the ag free inode list.
2099          */
2100         if (iagp->nfreeinos == cpu_to_le32(1)) {
2101                 if (amp) {
2102                         aiagp->inofreeback = iagp->inofreeback;
2103                         write_metapage(amp);
2104                 }
2105 
2106                 if (bmp) {
2107                         biagp->inofreefwd = iagp->inofreefwd;
2108                         write_metapage(bmp);
2109                 } else {
2110                         imap->im_agctl[agno].inofree =
2111                             le32_to_cpu(iagp->inofreefwd);
2112                 }
2113                 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2114         }
2115 
2116         /* update the free inode count at the iag, ag, inode
2117          * map levels.
2118          */
2119         le32_add_cpu(&iagp->nfreeinos, -1);
2120         imap->im_agctl[agno].numfree -= 1;
2121         atomic_dec(&imap->im_numfree);
2122 
2123         return (0);
2124 }
2125 
2126 
2127 /*
2128  * NAME:        diNewExt(imap,iagp,extno)
2129  *
2130  * FUNCTION:    initialize a new extent of inodes for an iag, allocating
2131  *              the first inode of the extent for use for the current
2132  *              allocation request.
2133  *
2134  *              disk resources are allocated for the new extent of inodes
2135  *              and the inodes themselves are initialized to reflect their
2136  *              existence within the extent (i.e. their inode numbers and
2137  *              inode extent addresses are set) and their initial state
2138  *              (mode and link count are set to zero).
2139  *
2140  *              if the iag is new, it is not yet on an ag extent free list
2141  *              but will now be placed on this list.
2142  *
2143  *              if the allocation of the new extent causes the iag to
2144  *              have no free extent, the iag will be removed from the
2145  *              ag extent free list.
2146  *
2147  *              if the iag has no free backed inodes, it will be placed
2148  *              on the ag free inode list, since the addition of the new
2149  *              extent will now cause it to have free inodes.
2150  *
2151  *              a careful update approach is used to provide consistency
2152  *              (i.e. list consistency) in the face of updates to multiple
2153  *              buffers.  under this approach, all required buffers are
2154  *              obtained before making any updates and are held until all
2155  *              updates are complete.
2156  *
2157  * PRE CONDITION: Already have buffer lock on iagp.  Already have AG lock on
2158  *      this AG.  Must have read lock on imap inode.
2159  *
2160  * PARAMETERS:
2161  *      imap    - pointer to inode map control structure.
2162  *      iagp    - pointer to iag.
2163  *      extno   - extent number.
2164  *
2165  * RETURN VALUES:
2166  *      0       - success.
2167  *      -ENOSPC - insufficient disk resources.
2168  *      -EIO    - i/o error.
2169  */
2170 static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
2171 {
2172         int agno, iagno, fwd, back, freei = 0, sword, rc;
2173         struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
2174         struct metapage *amp, *bmp, *cmp, *dmp;
2175         struct inode *ipimap;
2176         s64 blkno, hint;
2177         int i, j;
2178         u32 mask;
2179         ino_t ino;
2180         struct dinode *dp;
2181         struct jfs_sb_info *sbi;
2182 
2183         /* better have free extents.
2184          */
2185         if (!iagp->nfreeexts) {
2186                 jfs_error(imap->im_ipimap->i_sb, "no free extents\n");
2187                 return -EIO;
2188         }
2189 
2190         /* get the inode map inode.
2191          */
2192         ipimap = imap->im_ipimap;
2193         sbi = JFS_SBI(ipimap->i_sb);
2194 
2195         amp = bmp = cmp = NULL;
2196 
2197         /* get the ag and iag numbers for this iag.
2198          */
2199         agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
2200         iagno = le32_to_cpu(iagp->iagnum);
2201 
2202         /* check if this is the last free extent within the
2203          * iag.  if so, the iag must be removed from the ag
2204          * free extent list, so get the iags preceding and
2205          * following the iag on this list.
2206          */
2207         if (iagp->nfreeexts == cpu_to_le32(1)) {
2208                 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
2209                         if ((rc = diIAGRead(imap, fwd, &amp)))
2210                                 return (rc);
2211                         aiagp = (struct iag *) amp->data;
2212                 }
2213 
2214                 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
2215                         if ((rc = diIAGRead(imap, back, &bmp)))
2216                                 goto error_out;
2217                         biagp = (struct iag *) bmp->data;
2218                 }
2219         } else {
2220                 /* the iag has free extents.  if all extents are free
2221                  * (as is the case for a newly allocated iag), the iag
2222                  * must be added to the ag free extent list, so get
2223                  * the iag at the head of the list in preparation for
2224                  * adding this iag to this list.
2225                  */
2226                 fwd = back = -1;
2227                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2228                         if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
2229                                 if ((rc = diIAGRead(imap, fwd, &amp)))
2230                                         goto error_out;
2231                                 aiagp = (struct iag *) amp->data;
2232                         }
2233                 }
2234         }
2235 
2236         /* check if the iag has no free inodes.  if so, the iag
2237          * will have to be added to the ag free inode list, so get
2238          * the iag at the head of the list in preparation for
2239          * adding this iag to this list.  in doing this, we must
2240          * check if we already have the iag at the head of
2241          * the list in hand.
2242          */
2243         if (iagp->nfreeinos == 0) {
2244                 freei = imap->im_agctl[agno].inofree;
2245 
2246                 if (freei >= 0) {
2247                         if (freei == fwd) {
2248                                 ciagp = aiagp;
2249                         } else if (freei == back) {
2250                                 ciagp = biagp;
2251                         } else {
2252                                 if ((rc = diIAGRead(imap, freei, &cmp)))
2253                                         goto error_out;
2254                                 ciagp = (struct iag *) cmp->data;
2255                         }
2256                         if (ciagp == NULL) {
2257                                 jfs_error(imap->im_ipimap->i_sb,
2258                                           "ciagp == NULL\n");
2259                                 rc = -EIO;
2260                                 goto error_out;
2261                         }
2262                 }
2263         }
2264 
2265         /* allocate disk space for the inode extent.
2266          */
2267         if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0))
2268                 hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
2269         else
2270                 hint = addressPXD(&iagp->inoext[extno - 1]) +
2271                     lengthPXD(&iagp->inoext[extno - 1]) - 1;
2272 
2273         if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno)))
2274                 goto error_out;
2275 
2276         /* compute the inode number of the first inode within the
2277          * extent.
2278          */
2279         ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
2280 
2281         /* initialize the inodes within the newly allocated extent a
2282          * page at a time.
2283          */
2284         for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
2285                 /* get a buffer for this page of disk inodes.
2286                  */
2287                 dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
2288                 if (dmp == NULL) {
2289                         rc = -EIO;
2290                         goto error_out;
2291                 }
2292                 dp = (struct dinode *) dmp->data;
2293 
2294                 /* initialize the inode number, mode, link count and
2295                  * inode extent address.
2296                  */
2297                 for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
2298                         dp->di_inostamp = cpu_to_le32(sbi->inostamp);
2299                         dp->di_number = cpu_to_le32(ino);
2300                         dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
2301                         dp->di_mode = 0;
2302                         dp->di_nlink = 0;
2303                         PXDaddress(&(dp->di_ixpxd), blkno);
2304                         PXDlength(&(dp->di_ixpxd), imap->im_nbperiext);
2305                 }
2306                 write_metapage(dmp);
2307         }
2308 
2309         /* if this is the last free extent within the iag, remove the
2310          * iag from the ag free extent list.
2311          */
2312         if (iagp->nfreeexts == cpu_to_le32(1)) {
2313                 if (fwd >= 0)
2314                         aiagp->extfreeback = iagp->extfreeback;
2315 
2316                 if (back >= 0)
2317                         biagp->extfreefwd = iagp->extfreefwd;
2318                 else
2319                         imap->im_agctl[agno].extfree =
2320                             le32_to_cpu(iagp->extfreefwd);
2321 
2322                 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2323         } else {
2324                 /* if the iag has all free extents (newly allocated iag),
2325                  * add the iag to the ag free extent list.
2326                  */
2327                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2328                         if (fwd >= 0)
2329                                 aiagp->extfreeback = cpu_to_le32(iagno);
2330 
2331                         iagp->extfreefwd = cpu_to_le32(fwd);
2332                         iagp->extfreeback = cpu_to_le32(-1);
2333                         imap->im_agctl[agno].extfree = iagno;
2334                 }
2335         }
2336 
2337         /* if the iag has no free inodes, add the iag to the
2338          * ag free inode list.
2339          */
2340         if (iagp->nfreeinos == 0) {
2341                 if (freei >= 0)
2342                         ciagp->inofreeback = cpu_to_le32(iagno);
2343 
2344                 iagp->inofreefwd =
2345                     cpu_to_le32(imap->im_agctl[agno].inofree);
2346                 iagp->inofreeback = cpu_to_le32(-1);
2347                 imap->im_agctl[agno].inofree = iagno;
2348         }
2349 
2350         /* initialize the extent descriptor of the extent. */
2351         PXDlength(&iagp->inoext[extno], imap->im_nbperiext);
2352         PXDaddress(&iagp->inoext[extno], blkno);
2353 
2354         /* initialize the working and persistent map of the extent.
2355          * the working map will be initialized such that
2356          * it indicates the first inode of the extent is allocated.
2357          */
2358         iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
2359         iagp->pmap[extno] = 0;
2360 
2361         /* update the free inode and free extent summary maps
2362          * for the extent to indicate the extent has free inodes
2363          * and no longer represents a free extent.
2364          */
2365         sword = extno >> L2EXTSPERSUM;
2366         mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
2367         iagp->extsmap[sword] |= cpu_to_le32(mask);
2368         iagp->inosmap[sword] &= cpu_to_le32(~mask);
2369 
2370         /* update the free inode and free extent counts for the
2371          * iag.
2372          */
2373         le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1));
2374         le32_add_cpu(&iagp->nfreeexts, -1);
2375 
2376         /* update the free and backed inode counts for the ag.
2377          */
2378         imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
2379         imap->im_agctl[agno].numinos += INOSPEREXT;
2380 
2381         /* update the free and backed inode counts for the inode map.
2382          */
2383         atomic_add(INOSPEREXT - 1, &imap->im_numfree);
2384         atomic_add(INOSPEREXT, &imap->im_numinos);
2385 
2386         /* write the iags.
2387          */
2388         if (amp)
2389                 write_metapage(amp);
2390         if (bmp)
2391                 write_metapage(bmp);
2392         if (cmp)
2393                 write_metapage(cmp);
2394 
2395         return (0);
2396 
2397       error_out:
2398 
2399         /* release the iags.
2400          */
2401         if (amp)
2402                 release_metapage(amp);
2403         if (bmp)
2404                 release_metapage(bmp);
2405         if (cmp)
2406                 release_metapage(cmp);
2407 
2408         return (rc);
2409 }
2410 
2411 
2412 /*
2413  * NAME:        diNewIAG(imap,iagnop,agno)
2414  *
2415  * FUNCTION:    allocate a new iag for an allocation group.
2416  *
2417  *              first tries to allocate the iag from the inode map
2418  *              iagfree list:
2419  *              if the list has free iags, the head of the list is removed
2420  *              and returned to satisfy the request.
2421  *              if the inode map's iag free list is empty, the inode map
2422  *              is extended to hold a new iag. this new iag is initialized
2423  *              and returned to satisfy the request.
2424  *
2425  * PARAMETERS:
2426  *      imap    - pointer to inode map control structure.
2427  *      iagnop  - pointer to an iag number set with the number of the
2428  *                newly allocated iag upon successful return.
2429  *      agno    - allocation group number.
2430  *      bpp     - Buffer pointer to be filled in with new IAG's buffer
2431  *
2432  * RETURN VALUES:
2433  *      0       - success.
2434  *      -ENOSPC - insufficient disk resources.
2435  *      -EIO    - i/o error.
2436  *
2437  * serialization:
2438  *      AG lock held on entry/exit;
2439  *      write lock on the map is held inside;
2440  *      read lock on the map is held on successful completion;
2441  *
2442  * note: new iag transaction:
2443  * . synchronously write iag;
2444  * . write log of xtree and inode of imap;
2445  * . commit;
2446  * . synchronous write of xtree (right to left, bottom to top);
2447  * . at start of logredo(): init in-memory imap with one additional iag page;
2448  * . at end of logredo(): re-read imap inode to determine
2449  *   new imap size;
2450  */
2451 static int
2452 diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
2453 {
2454         int rc;
2455         int iagno, i, xlen;
2456         struct inode *ipimap;
2457         struct super_block *sb;
2458         struct jfs_sb_info *sbi;
2459         struct metapage *mp;
2460         struct iag *iagp;
2461         s64 xaddr = 0;
2462         s64 blkno;
2463         tid_t tid;
2464         struct inode *iplist[1];
2465 
2466         /* pick up pointers to the inode map and mount inodes */
2467         ipimap = imap->im_ipimap;
2468         sb = ipimap->i_sb;
2469         sbi = JFS_SBI(sb);
2470 
2471         /* acquire the free iag lock */
2472         IAGFREE_LOCK(imap);
2473 
2474         /* if there are any iags on the inode map free iag list,
2475          * allocate the iag from the head of the list.
2476          */
2477         if (imap->im_freeiag >= 0) {
2478                 /* pick up the iag number at the head of the list */
2479                 iagno = imap->im_freeiag;
2480 
2481                 /* determine the logical block number of the iag */
2482                 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2483         } else {
2484                 /* no free iags. the inode map will have to be extented
2485                  * to include a new iag.
2486                  */
2487 
2488                 /* acquire inode map lock */
2489                 IWRITE_LOCK(ipimap, RDWRLOCK_IMAP);
2490 
2491                 if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
2492                         IWRITE_UNLOCK(ipimap);
2493                         IAGFREE_UNLOCK(imap);
2494                         jfs_error(imap->im_ipimap->i_sb,
2495                                   "ipimap->i_size is wrong\n");
2496                         return -EIO;
2497                 }
2498 
2499 
2500                 /* get the next available iag number */
2501                 iagno = imap->im_nextiag;
2502 
2503                 /* make sure that we have not exceeded the maximum inode
2504                  * number limit.
2505                  */
2506                 if (iagno > (MAXIAGS - 1)) {
2507                         /* release the inode map lock */
2508                         IWRITE_UNLOCK(ipimap);
2509 
2510                         rc = -ENOSPC;
2511                         goto out;
2512                 }
2513 
2514                 /*
2515                  * synchronously append new iag page.
2516                  */
2517                 /* determine the logical address of iag page to append */
2518                 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
2519 
2520                 /* Allocate extent for new iag page */
2521                 xlen = sbi->nbperpage;
2522                 if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) {
2523                         /* release the inode map lock */
2524                         IWRITE_UNLOCK(ipimap);
2525 
2526                         goto out;
2527                 }
2528 
2529                 /*
2530                  * start transaction of update of the inode map
2531                  * addressing structure pointing to the new iag page;
2532                  */
2533                 tid = txBegin(sb, COMMIT_FORCE);
2534                 mutex_lock(&JFS_IP(ipimap)->commit_mutex);
2535 
2536                 /* update the inode map addressing structure to point to it */
2537                 if ((rc =
2538                      xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) {
2539                         txEnd(tid);
2540                         mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2541                         /* Free the blocks allocated for the iag since it was
2542                          * not successfully added to the inode map
2543                          */
2544                         dbFree(ipimap, xaddr, (s64) xlen);
2545 
2546                         /* release the inode map lock */
2547                         IWRITE_UNLOCK(ipimap);
2548 
2549                         goto out;
2550                 }
2551 
2552                 /* update the inode map's inode to reflect the extension */
2553                 ipimap->i_size += PSIZE;
2554                 inode_add_bytes(ipimap, PSIZE);
2555 
2556                 /* assign a buffer for the page */
2557                 mp = get_metapage(ipimap, blkno, PSIZE, 0);
2558                 if (!mp) {
2559                         /*
2560                          * This is very unlikely since we just created the
2561                          * extent, but let's try to handle it correctly
2562                          */
2563                         xtTruncate(tid, ipimap, ipimap->i_size - PSIZE,
2564                                    COMMIT_PWMAP);
2565 
2566                         txAbort(tid, 0);
2567                         txEnd(tid);
2568                         mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2569 
2570                         /* release the inode map lock */
2571                         IWRITE_UNLOCK(ipimap);
2572 
2573                         rc = -EIO;
2574                         goto out;
2575                 }
2576                 iagp = (struct iag *) mp->data;
2577 
2578                 /* init the iag */
2579                 memset(iagp, 0, sizeof(struct iag));
2580                 iagp->iagnum = cpu_to_le32(iagno);
2581                 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
2582                 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
2583                 iagp->iagfree = cpu_to_le32(-1);
2584                 iagp->nfreeinos = 0;
2585                 iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
2586 
2587                 /* initialize the free inode summary map (free extent
2588                  * summary map initialization handled by bzero).
2589                  */
2590                 for (i = 0; i < SMAPSZ; i++)
2591                         iagp->inosmap[i] = cpu_to_le32(ONES);
2592 
2593                 /*
2594                  * Write and sync the metapage
2595                  */
2596                 flush_metapage(mp);
2597 
2598                 /*
2599                  * txCommit(COMMIT_FORCE) will synchronously write address
2600                  * index pages and inode after commit in careful update order
2601                  * of address index pages (right to left, bottom up);
2602                  */
2603                 iplist[0] = ipimap;
2604                 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
2605 
2606                 txEnd(tid);
2607                 mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
2608 
2609                 duplicateIXtree(sb, blkno, xlen, &xaddr);
2610 
2611                 /* update the next available iag number */
2612                 imap->im_nextiag += 1;
2613 
2614                 /* Add the iag to the iag free list so we don't lose the iag
2615                  * if a failure happens now.
2616                  */
2617                 imap->im_freeiag = iagno;
2618 
2619                 /* Until we have logredo working, we want the imap inode &
2620                  * control page to be up to date.
2621                  */
2622                 diSync(ipimap);
2623 
2624                 /* release the inode map lock */
2625                 IWRITE_UNLOCK(ipimap);
2626         }
2627 
2628         /* obtain read lock on map */
2629         IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2630 
2631         /* read the iag */
2632         if ((rc = diIAGRead(imap, iagno, &mp))) {
2633                 IREAD_UNLOCK(ipimap);
2634                 rc = -EIO;
2635                 goto out;
2636         }
2637         iagp = (struct iag *) mp->data;
2638 
2639         /* remove the iag from the iag free list */
2640         imap->im_freeiag = le32_to_cpu(iagp->iagfree);
2641         iagp->iagfree = cpu_to_le32(-1);
2642 
2643         /* set the return iag number and buffer pointer */
2644         *iagnop = iagno;
2645         *mpp = mp;
2646 
2647       out:
2648         /* release the iag free lock */
2649         IAGFREE_UNLOCK(imap);
2650 
2651         return (rc);
2652 }
2653 
2654 /*
2655  * NAME:        diIAGRead()
2656  *
2657  * FUNCTION:    get the buffer for the specified iag within a fileset
2658  *              or aggregate inode map.
2659  *
2660  * PARAMETERS:
2661  *      imap    - pointer to inode map control structure.
2662  *      iagno   - iag number.
2663  *      bpp     - point to buffer pointer to be filled in on successful
2664  *                exit.
2665  *
2666  * SERIALIZATION:
2667  *      must have read lock on imap inode
2668  *      (When called by diExtendFS, the filesystem is quiesced, therefore
2669  *       the read lock is unnecessary.)
2670  *
2671  * RETURN VALUES:
2672  *      0       - success.
2673  *      -EIO    - i/o error.
2674  */
2675 static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
2676 {
2677         struct inode *ipimap = imap->im_ipimap;
2678         s64 blkno;
2679 
2680         /* compute the logical block number of the iag. */
2681         blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
2682 
2683         /* read the iag. */
2684         *mpp = read_metapage(ipimap, blkno, PSIZE, 0);
2685         if (*mpp == NULL) {
2686                 return -EIO;
2687         }
2688 
2689         return (0);
2690 }
2691 
2692 /*
2693  * NAME:        diFindFree()
2694  *
2695  * FUNCTION:    find the first free bit in a word starting at
2696  *              the specified bit position.
2697  *
2698  * PARAMETERS:
2699  *      word    - word to be examined.
2700  *      start   - starting bit position.
2701  *
2702  * RETURN VALUES:
2703  *      bit position of first free bit in the word or 32 if
2704  *      no free bits were found.
2705  */
2706 static int diFindFree(u32 word, int start)
2707 {
2708         int bitno;
2709         assert(start < 32);
2710         /* scan the word for the first free bit. */
2711         for (word <<= start, bitno = start; bitno < 32;
2712              bitno++, word <<= 1) {
2713                 if ((word & HIGHORDER) == 0)
2714                         break;
2715         }
2716         return (bitno);
2717 }
2718 
2719 /*
2720  * NAME:        diUpdatePMap()
2721  *
2722  * FUNCTION: Update the persistent map in an IAG for the allocation or
2723  *      freeing of the specified inode.
2724  *
2725  * PRE CONDITIONS: Working map has already been updated for allocate.
2726  *
2727  * PARAMETERS:
2728  *      ipimap  - Incore inode map inode
2729  *      inum    - Number of inode to mark in permanent map
2730  *      is_free - If 'true' indicates inode should be marked freed, otherwise
2731  *                indicates inode should be marked allocated.
2732  *
2733  * RETURN VALUES:
2734  *              0 for success
2735  */
2736 int
2737 diUpdatePMap(struct inode *ipimap,
2738              unsigned long inum, bool is_free, struct tblock * tblk)
2739 {
2740         int rc;
2741         struct iag *iagp;
2742         struct metapage *mp;
2743         int iagno, ino, extno, bitno;
2744         struct inomap *imap;
2745         u32 mask;
2746         struct jfs_log *log;
2747         int lsn, difft, diffp;
2748         unsigned long flags;
2749 
2750         imap = JFS_IP(ipimap)->i_imap;
2751         /* get the iag number containing the inode */
2752         iagno = INOTOIAG(inum);
2753         /* make sure that the iag is contained within the map */
2754         if (iagno >= imap->im_nextiag) {
2755                 jfs_error(ipimap->i_sb, "the iag is outside the map\n");
2756                 return -EIO;
2757         }
2758         /* read the iag */
2759         IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
2760         rc = diIAGRead(imap, iagno, &mp);
2761         IREAD_UNLOCK(ipimap);
2762         if (rc)
2763                 return (rc);
2764         metapage_wait_for_io(mp);
2765         iagp = (struct iag *) mp->data;
2766         /* get the inode number and extent number of the inode within
2767          * the iag and the inode number within the extent.
2768          */
2769         ino = inum & (INOSPERIAG - 1);
2770         extno = ino >> L2INOSPEREXT;
2771         bitno = ino & (INOSPEREXT - 1);
2772         mask = HIGHORDER >> bitno;
2773         /*
2774          * mark the inode free in persistent map:
2775          */
2776         if (is_free) {
2777                 /* The inode should have been allocated both in working
2778                  * map and in persistent map;
2779                  * the inode will be freed from working map at the release
2780                  * of last reference release;
2781                  */
2782                 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2783                         jfs_error(ipimap->i_sb,
2784                                   "inode %ld not marked as allocated in wmap!\n",
2785                                   inum);
2786                 }
2787                 if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
2788                         jfs_error(ipimap->i_sb,
2789                                   "inode %ld not marked as allocated in pmap!\n",
2790                                   inum);
2791                 }
2792                 /* update the bitmap for the extent of the freed inode */
2793                 iagp->pmap[extno] &= cpu_to_le32(~mask);
2794         }
2795         /*
2796          * mark the inode allocated in persistent map:
2797          */
2798         else {
2799                 /* The inode should be already allocated in the working map
2800                  * and should be free in persistent map;
2801                  */
2802                 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
2803                         release_metapage(mp);
2804                         jfs_error(ipimap->i_sb,
2805                                   "the inode is not allocated in the working map\n");
2806                         return -EIO;
2807                 }
2808                 if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
2809                         release_metapage(mp);
2810                         jfs_error(ipimap->i_sb,
2811                                   "the inode is not free in the persistent map\n");
2812                         return -EIO;
2813                 }
2814                 /* update the bitmap for the extent of the allocated inode */
2815                 iagp->pmap[extno] |= cpu_to_le32(mask);
2816         }
2817         /*
2818          * update iag lsn
2819          */
2820         lsn = tblk->lsn;
2821         log = JFS_SBI(tblk->sb)->log;
2822         LOGSYNC_LOCK(log, flags);
2823         if (mp->lsn != 0) {
2824                 /* inherit older/smaller lsn */
2825                 logdiff(difft, lsn, log);
2826                 logdiff(diffp, mp->lsn, log);
2827                 if (difft < diffp) {
2828                         mp->lsn = lsn;
2829                         /* move mp after tblock in logsync list */
2830                         list_move(&mp->synclist, &tblk->synclist);
2831                 }
2832                 /* inherit younger/larger clsn */
2833                 assert(mp->clsn);
2834                 logdiff(difft, tblk->clsn, log);
2835                 logdiff(diffp, mp->clsn, log);
2836                 if (difft > diffp)
2837                         mp->clsn = tblk->clsn;
2838         } else {
2839                 mp->log = log;
2840                 mp->lsn = lsn;
2841                 /* insert mp after tblock in logsync list */
2842                 log->count++;
2843                 list_add(&mp->synclist, &tblk->synclist);
2844                 mp->clsn = tblk->clsn;
2845         }
2846         LOGSYNC_UNLOCK(log, flags);
2847         write_metapage(mp);
2848         return (0);
2849 }
2850 
2851 /*
2852  *      diExtendFS()
2853  *
2854  * function: update imap for extendfs();
2855  *
2856  * note: AG size has been increased s.t. each k old contiguous AGs are
2857  * coalesced into a new AG;
2858  */
2859 int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
2860 {
2861         int rc, rcx = 0;
2862         struct inomap *imap = JFS_IP(ipimap)->i_imap;
2863         struct iag *iagp = NULL, *hiagp = NULL;
2864         struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap;
2865         struct metapage *bp, *hbp;
2866         int i, n, head;
2867         int numinos, xnuminos = 0, xnumfree = 0;
2868         s64 agstart;
2869 
2870         jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
2871                    imap->im_nextiag, atomic_read(&imap->im_numinos),
2872                    atomic_read(&imap->im_numfree));
2873 
2874         /*
2875          *      reconstruct imap
2876          *
2877          * coalesce contiguous k (newAGSize/oldAGSize) AGs;
2878          * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
2879          * note: new AG size = old AG size * (2**x).
2880          */
2881 
2882         /* init per AG control information im_agctl[] */
2883         for (i = 0; i < MAXAG; i++) {
2884                 imap->im_agctl[i].inofree = -1;
2885                 imap->im_agctl[i].extfree = -1;
2886                 imap->im_agctl[i].numinos = 0;  /* number of backed inodes */
2887                 imap->im_agctl[i].numfree = 0;  /* number of free backed inodes */
2888         }
2889 
2890         /*
2891          *      process each iag page of the map.
2892          *
2893          * rebuild AG Free Inode List, AG Free Inode Extent List;
2894          */
2895         for (i = 0; i < imap->im_nextiag; i++) {
2896                 if ((rc = diIAGRead(imap, i, &bp))) {
2897                         rcx = rc;
2898                         continue;
2899                 }
2900                 iagp = (struct iag *) bp->data;
2901                 if (le32_to_cpu(iagp->iagnum) != i) {
2902                         release_metapage(bp);
2903                         jfs_error(ipimap->i_sb, "unexpected value of iagnum\n");
2904                         return -EIO;
2905                 }
2906 
2907                 /* leave free iag in the free iag list */
2908                 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
2909                         release_metapage(bp);
2910                         continue;
2911                 }
2912 
2913                 agstart = le64_to_cpu(iagp->agstart);
2914                 n = agstart >> mp->db_agl2size;
2915                 iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
2916 
2917                 /* compute backed inodes */
2918                 numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
2919                     << L2INOSPEREXT;
2920                 if (numinos > 0) {
2921                         /* merge AG backed inodes */
2922                         imap->im_agctl[n].numinos += numinos;
2923                         xnuminos += numinos;
2924                 }
2925 
2926                 /* if any backed free inodes, insert at AG free inode list */
2927                 if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
2928                         if ((head = imap->im_agctl[n].inofree) == -1) {
2929                                 iagp->inofreefwd = cpu_to_le32(-1);
2930                                 iagp->inofreeback = cpu_to_le32(-1);
2931                         } else {
2932                                 if ((rc = diIAGRead(imap, head, &hbp))) {
2933                                         rcx = rc;
2934                                         goto nextiag;
2935                                 }
2936                                 hiagp = (struct iag *) hbp->data;
2937                                 hiagp->inofreeback = iagp->iagnum;
2938                                 iagp->inofreefwd = cpu_to_le32(head);
2939                                 iagp->inofreeback = cpu_to_le32(-1);
2940                                 write_metapage(hbp);
2941                         }
2942 
2943                         imap->im_agctl[n].inofree =
2944                             le32_to_cpu(iagp->iagnum);
2945 
2946                         /* merge AG backed free inodes */
2947                         imap->im_agctl[n].numfree +=
2948                             le32_to_cpu(iagp->nfreeinos);
2949                         xnumfree += le32_to_cpu(iagp->nfreeinos);
2950                 }
2951 
2952                 /* if any free extents, insert at AG free extent list */
2953                 if (le32_to_cpu(iagp->nfreeexts) > 0) {
2954                         if ((head = imap->im_agctl[n].extfree) == -1) {
2955                                 iagp->extfreefwd = cpu_to_le32(-1);
2956                                 iagp->extfreeback = cpu_to_le32(-1);
2957                         } else {
2958                                 if ((rc = diIAGRead(imap, head, &hbp))) {
2959                                         rcx = rc;
2960                                         goto nextiag;
2961                                 }
2962                                 hiagp = (struct iag *) hbp->data;
2963                                 hiagp->extfreeback = iagp->iagnum;
2964                                 iagp->extfreefwd = cpu_to_le32(head);
2965                                 iagp->extfreeback = cpu_to_le32(-1);
2966                                 write_metapage(hbp);
2967                         }
2968 
2969                         imap->im_agctl[n].extfree =
2970                             le32_to_cpu(iagp->iagnum);
2971                 }
2972 
2973               nextiag:
2974                 write_metapage(bp);
2975         }
2976 
2977         if (xnuminos != atomic_read(&imap->im_numinos) ||
2978             xnumfree != atomic_read(&imap->im_numfree)) {
2979                 jfs_error(ipimap->i_sb, "numinos or numfree incorrect\n");
2980                 return -EIO;
2981         }
2982 
2983         return rcx;
2984 }
2985 
2986 
2987 /*
2988  *      duplicateIXtree()
2989  *
2990  * serialization: IWRITE_LOCK held on entry/exit
2991  *
2992  * note: shadow page with regular inode (rel.2);
2993  */
2994 static void duplicateIXtree(struct super_block *sb, s64 blkno,
2995                             int xlen, s64 *xaddr)
2996 {
2997         struct jfs_superblock *j_sb;
2998         struct buffer_head *bh;
2999         struct inode *ip;
3000         tid_t tid;
3001 
3002         /* if AIT2 ipmap2 is bad, do not try to update it */
3003         if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT)        /* s_flag */
3004                 return;
3005         ip = diReadSpecial(sb, FILESYSTEM_I, 1);
3006         if (ip == NULL) {
3007                 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3008                 if (readSuper(sb, &bh))
3009                         return;
3010                 j_sb = (struct jfs_superblock *)bh->b_data;
3011                 j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
3012 
3013                 mark_buffer_dirty(bh);
3014                 sync_dirty_buffer(bh);
3015                 brelse(bh);
3016                 return;
3017         }
3018 
3019         /* start transaction */
3020         tid = txBegin(sb, COMMIT_FORCE);
3021         /* update the inode map addressing structure to point to it */
3022         if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) {
3023                 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
3024                 txAbort(tid, 1);
3025                 goto cleanup;
3026 
3027         }
3028         /* update the inode map's inode to reflect the extension */
3029         ip->i_size += PSIZE;
3030         inode_add_bytes(ip, PSIZE);
3031         txCommit(tid, 1, &ip, COMMIT_FORCE);
3032       cleanup:
3033         txEnd(tid);
3034         diFreeSpecial(ip);
3035 }
3036 
3037 /*
3038  * NAME:        copy_from_dinode()
3039  *
3040  * FUNCTION:    Copies inode info from disk inode to in-memory inode
3041  *
3042  * RETURN VALUES:
3043  *      0       - success
3044  *      -ENOMEM - insufficient memory
3045  */
3046 static int copy_from_dinode(struct dinode * dip, struct inode *ip)
3047 {
3048         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3049         struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3050 
3051         jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
3052         jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
3053         jfs_set_inode_flags(ip);
3054 
3055         ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
3056         if (sbi->umask != -1) {
3057                 ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask);
3058                 /* For directories, add x permission if r is allowed by umask */
3059                 if (S_ISDIR(ip->i_mode)) {
3060                         if (ip->i_mode & 0400)
3061                                 ip->i_mode |= 0100;
3062                         if (ip->i_mode & 0040)
3063                                 ip->i_mode |= 0010;
3064                         if (ip->i_mode & 0004)
3065                                 ip->i_mode |= 0001;
3066                 }
3067         }
3068         set_nlink(ip, le32_to_cpu(dip->di_nlink));
3069 
3070         jfs_ip->saved_uid = make_kuid(&init_user_ns, le32_to_cpu(dip->di_uid));
3071         if (!uid_valid(sbi->uid))
3072                 ip->i_uid = jfs_ip->saved_uid;
3073         else {
3074                 ip->i_uid = sbi->uid;
3075         }
3076 
3077         jfs_ip->saved_gid = make_kgid(&init_user_ns, le32_to_cpu(dip->di_gid));
3078         if (!gid_valid(sbi->gid))
3079                 ip->i_gid = jfs_ip->saved_gid;
3080         else {
3081                 ip->i_gid = sbi->gid;
3082         }
3083 
3084         ip->i_size = le64_to_cpu(dip->di_size);
3085         ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec);
3086         ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec);
3087         ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec);
3088         ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec);
3089         ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec);
3090         ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec);
3091         ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
3092         ip->i_generation = le32_to_cpu(dip->di_gen);
3093 
3094         jfs_ip->ixpxd = dip->di_ixpxd;  /* in-memory pxd's are little-endian */
3095         jfs_ip->acl = dip->di_acl;      /* as are dxd's */
3096         jfs_ip->ea = dip->di_ea;
3097         jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
3098         jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
3099         jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
3100 
3101         if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
3102                 jfs_ip->dev = le32_to_cpu(dip->di_rdev);
3103                 ip->i_rdev = new_decode_dev(jfs_ip->dev);
3104         }
3105 
3106         if (S_ISDIR(ip->i_mode)) {
3107                 memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384);
3108         } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
3109                 memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
3110         } else
3111                 memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
3112 
3113         /* Zero the in-memory-only stuff */
3114         jfs_ip->cflag = 0;
3115         jfs_ip->btindex = 0;
3116         jfs_ip->btorder = 0;
3117         jfs_ip->bxflag = 0;
3118         jfs_ip->blid = 0;
3119         jfs_ip->atlhead = 0;
3120         jfs_ip->atltail = 0;
3121         jfs_ip->xtlid = 0;
3122         return (0);
3123 }
3124 
3125 /*
3126  * NAME:        copy_to_dinode()
3127  *
3128  * FUNCTION:    Copies inode info from in-memory inode to disk inode
3129  */
3130 static void copy_to_dinode(struct dinode * dip, struct inode *ip)
3131 {
3132         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
3133         struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
3134 
3135         dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
3136         dip->di_inostamp = cpu_to_le32(sbi->inostamp);
3137         dip->di_number = cpu_to_le32(ip->i_ino);
3138         dip->di_gen = cpu_to_le32(ip->i_generation);
3139         dip->di_size = cpu_to_le64(ip->i_size);
3140         dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
3141         dip->di_nlink = cpu_to_le32(ip->i_nlink);
3142         if (!uid_valid(sbi->uid))
3143                 dip->di_uid = cpu_to_le32(i_uid_read(ip));
3144         else
3145                 dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns,
3146                                                    jfs_ip->saved_uid));
3147         if (!gid_valid(sbi->gid))
3148                 dip->di_gid = cpu_to_le32(i_gid_read(ip));
3149         else
3150                 dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns,
3151                                                     jfs_ip->saved_gid));
3152         jfs_get_inode_flags(jfs_ip);
3153         /*
3154          * mode2 is only needed for storing the higher order bits.
3155          * Trust i_mode for the lower order ones
3156          */
3157         if (sbi->umask == -1)
3158                 dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) |
3159                                            ip->i_mode);
3160         else /* Leave the original permissions alone */
3161                 dip->di_mode = cpu_to_le32(jfs_ip->mode2);
3162 
3163         dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec);
3164         dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec);
3165         dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec);
3166         dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec);
3167         dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec);
3168         dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec);
3169         dip->di_ixpxd = jfs_ip->ixpxd;  /* in-memory pxd's are little-endian */
3170         dip->di_acl = jfs_ip->acl;      /* as are dxd's */
3171         dip->di_ea = jfs_ip->ea;
3172         dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
3173         dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
3174         dip->di_otime.tv_nsec = 0;
3175         dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
3176         if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
3177                 dip->di_rdev = cpu_to_le32(jfs_ip->dev);
3178 }
3179 

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