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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, "diRead: i_ino != di_number"); |
390 | rc = -EIO; |
391 | } else if (le32_to_cpu(dp->di_nlink) == 0) |
392 | rc = -ESTALE; |
393 | else |
394 | /* copy the disk inode to the in-memory inode */ |
395 | rc = copy_from_dinode(dp, ip); |
396 | |
397 | release_metapage(mp); |
398 | |
399 | /* set the ag for the inode */ |
400 | JFS_IP(ip)->agno = BLKTOAG(agstart, sbi); |
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 | ip->i_nlink = 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 | ip->i_nlink = 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 | ip->i_hash.pprev = &ip->i_hash.next; |
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, "diWrite: ixpxd invalid"); |
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, |
897 | "diFree: inum = %d, iagno = %d, nextiag = %d", |
898 | (uint) inum, iagno, imap->im_nextiag); |
899 | return -EIO; |
900 | } |
901 | |
902 | /* get the allocation group for this ino. |
903 | */ |
904 | agno = JFS_IP(ip)->agno; |
905 | |
906 | /* Lock the AG specific inode map information |
907 | */ |
908 | AG_LOCK(imap, agno); |
909 | |
910 | /* Obtain read lock in imap inode. Don't release it until we have |
911 | * read all of the IAG's that we are going to. |
912 | */ |
913 | IREAD_LOCK(ipimap, RDWRLOCK_IMAP); |
914 | |
915 | /* read the iag. |
916 | */ |
917 | if ((rc = diIAGRead(imap, iagno, &mp))) { |
918 | IREAD_UNLOCK(ipimap); |
919 | AG_UNLOCK(imap, agno); |
920 | return (rc); |
921 | } |
922 | iagp = (struct iag *) mp->data; |
923 | |
924 | /* get the inode number and extent number of the inode within |
925 | * the iag and the inode number within the extent. |
926 | */ |
927 | ino = inum & (INOSPERIAG - 1); |
928 | extno = ino >> L2INOSPEREXT; |
929 | bitno = ino & (INOSPEREXT - 1); |
930 | mask = HIGHORDER >> bitno; |
931 | |
932 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { |
933 | jfs_error(ip->i_sb, |
934 | "diFree: wmap shows inode already free"); |
935 | } |
936 | |
937 | if (!addressPXD(&iagp->inoext[extno])) { |
938 | release_metapage(mp); |
939 | IREAD_UNLOCK(ipimap); |
940 | AG_UNLOCK(imap, agno); |
941 | jfs_error(ip->i_sb, "diFree: invalid inoext"); |
942 | return -EIO; |
943 | } |
944 | |
945 | /* compute the bitmap for the extent reflecting the freed inode. |
946 | */ |
947 | bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask; |
948 | |
949 | if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) { |
950 | release_metapage(mp); |
951 | IREAD_UNLOCK(ipimap); |
952 | AG_UNLOCK(imap, agno); |
953 | jfs_error(ip->i_sb, "diFree: numfree > numinos"); |
954 | return -EIO; |
955 | } |
956 | /* |
957 | * inode extent still has some inodes or below low water mark: |
958 | * keep the inode extent; |
959 | */ |
960 | if (bitmap || |
961 | imap->im_agctl[agno].numfree < 96 || |
962 | (imap->im_agctl[agno].numfree < 288 && |
963 | (((imap->im_agctl[agno].numfree * 100) / |
964 | imap->im_agctl[agno].numinos) <= 25))) { |
965 | /* if the iag currently has no free inodes (i.e., |
966 | * the inode being freed is the first free inode of iag), |
967 | * insert the iag at head of the inode free list for the ag. |
968 | */ |
969 | if (iagp->nfreeinos == 0) { |
970 | /* check if there are any iags on the ag inode |
971 | * free list. if so, read the first one so that |
972 | * we can link the current iag onto the list at |
973 | * the head. |
974 | */ |
975 | if ((fwd = imap->im_agctl[agno].inofree) >= 0) { |
976 | /* read the iag that currently is the head |
977 | * of the list. |
978 | */ |
979 | if ((rc = diIAGRead(imap, fwd, &))) { |
980 | IREAD_UNLOCK(ipimap); |
981 | AG_UNLOCK(imap, agno); |
982 | release_metapage(mp); |
983 | return (rc); |
984 | } |
985 | aiagp = (struct iag *) amp->data; |
986 | |
987 | /* make current head point back to the iag. |
988 | */ |
989 | aiagp->inofreeback = cpu_to_le32(iagno); |
990 | |
991 | write_metapage(amp); |
992 | } |
993 | |
994 | /* iag points forward to current head and iag |
995 | * becomes the new head of the list. |
996 | */ |
997 | iagp->inofreefwd = |
998 | cpu_to_le32(imap->im_agctl[agno].inofree); |
999 | iagp->inofreeback = cpu_to_le32(-1); |
1000 | imap->im_agctl[agno].inofree = iagno; |
1001 | } |
1002 | IREAD_UNLOCK(ipimap); |
1003 | |
1004 | /* update the free inode summary map for the extent if |
1005 | * freeing the inode means the extent will now have free |
1006 | * inodes (i.e., the inode being freed is the first free |
1007 | * inode of extent), |
1008 | */ |
1009 | if (iagp->wmap[extno] == cpu_to_le32(ONES)) { |
1010 | sword = extno >> L2EXTSPERSUM; |
1011 | bitno = extno & (EXTSPERSUM - 1); |
1012 | iagp->inosmap[sword] &= |
1013 | cpu_to_le32(~(HIGHORDER >> bitno)); |
1014 | } |
1015 | |
1016 | /* update the bitmap. |
1017 | */ |
1018 | iagp->wmap[extno] = cpu_to_le32(bitmap); |
1019 | |
1020 | /* update the free inode counts at the iag, ag and |
1021 | * map level. |
1022 | */ |
1023 | le32_add_cpu(&iagp->nfreeinos, 1); |
1024 | imap->im_agctl[agno].numfree += 1; |
1025 | atomic_inc(&imap->im_numfree); |
1026 | |
1027 | /* release the AG inode map lock |
1028 | */ |
1029 | AG_UNLOCK(imap, agno); |
1030 | |
1031 | /* write the iag */ |
1032 | write_metapage(mp); |
1033 | |
1034 | return (0); |
1035 | } |
1036 | |
1037 | |
1038 | /* |
1039 | * inode extent has become free and above low water mark: |
1040 | * free the inode extent; |
1041 | */ |
1042 | |
1043 | /* |
1044 | * prepare to update iag list(s) (careful update step 1) |
1045 | */ |
1046 | amp = bmp = cmp = dmp = NULL; |
1047 | fwd = back = -1; |
1048 | |
1049 | /* check if the iag currently has no free extents. if so, |
1050 | * it will be placed on the head of the ag extent free list. |
1051 | */ |
1052 | if (iagp->nfreeexts == 0) { |
1053 | /* check if the ag extent free list has any iags. |
1054 | * if so, read the iag at the head of the list now. |
1055 | * this (head) iag will be updated later to reflect |
1056 | * the addition of the current iag at the head of |
1057 | * the list. |
1058 | */ |
1059 | if ((fwd = imap->im_agctl[agno].extfree) >= 0) { |
1060 | if ((rc = diIAGRead(imap, fwd, &))) |
1061 | goto error_out; |
1062 | aiagp = (struct iag *) amp->data; |
1063 | } |
1064 | } else { |
1065 | /* iag has free extents. check if the addition of a free |
1066 | * extent will cause all extents to be free within this |
1067 | * iag. if so, the iag will be removed from the ag extent |
1068 | * free list and placed on the inode map's free iag list. |
1069 | */ |
1070 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { |
1071 | /* in preparation for removing the iag from the |
1072 | * ag extent free list, read the iags preceeding |
1073 | * and following the iag on the ag extent free |
1074 | * list. |
1075 | */ |
1076 | if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { |
1077 | if ((rc = diIAGRead(imap, fwd, &))) |
1078 | goto error_out; |
1079 | aiagp = (struct iag *) amp->data; |
1080 | } |
1081 | |
1082 | if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { |
1083 | if ((rc = diIAGRead(imap, back, &bmp))) |
1084 | goto error_out; |
1085 | biagp = (struct iag *) bmp->data; |
1086 | } |
1087 | } |
1088 | } |
1089 | |
1090 | /* remove the iag from the ag inode free list if freeing |
1091 | * this extent cause the iag to have no free inodes. |
1092 | */ |
1093 | if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { |
1094 | int inofreeback = le32_to_cpu(iagp->inofreeback); |
1095 | int inofreefwd = le32_to_cpu(iagp->inofreefwd); |
1096 | |
1097 | /* in preparation for removing the iag from the |
1098 | * ag inode free list, read the iags preceeding |
1099 | * and following the iag on the ag inode free |
1100 | * list. before reading these iags, we must make |
1101 | * sure that we already don't have them in hand |
1102 | * from up above, since re-reading an iag (buffer) |
1103 | * we are currently holding would cause a deadlock. |
1104 | */ |
1105 | if (inofreefwd >= 0) { |
1106 | |
1107 | if (inofreefwd == fwd) |
1108 | ciagp = (struct iag *) amp->data; |
1109 | else if (inofreefwd == back) |
1110 | ciagp = (struct iag *) bmp->data; |
1111 | else { |
1112 | if ((rc = |
1113 | diIAGRead(imap, inofreefwd, &cmp))) |
1114 | goto error_out; |
1115 | ciagp = (struct iag *) cmp->data; |
1116 | } |
1117 | assert(ciagp != NULL); |
1118 | } |
1119 | |
1120 | if (inofreeback >= 0) { |
1121 | if (inofreeback == fwd) |
1122 | diagp = (struct iag *) amp->data; |
1123 | else if (inofreeback == back) |
1124 | diagp = (struct iag *) bmp->data; |
1125 | else { |
1126 | if ((rc = |
1127 | diIAGRead(imap, inofreeback, &dmp))) |
1128 | goto error_out; |
1129 | diagp = (struct iag *) dmp->data; |
1130 | } |
1131 | assert(diagp != NULL); |
1132 | } |
1133 | } |
1134 | |
1135 | IREAD_UNLOCK(ipimap); |
1136 | |
1137 | /* |
1138 | * invalidate any page of the inode extent freed from buffer cache; |
1139 | */ |
1140 | freepxd = iagp->inoext[extno]; |
1141 | invalidate_pxd_metapages(ip, freepxd); |
1142 | |
1143 | /* |
1144 | * update iag list(s) (careful update step 2) |
1145 | */ |
1146 | /* add the iag to the ag extent free list if this is the |
1147 | * first free extent for the iag. |
1148 | */ |
1149 | if (iagp->nfreeexts == 0) { |
1150 | if (fwd >= 0) |
1151 | aiagp->extfreeback = cpu_to_le32(iagno); |
1152 | |
1153 | iagp->extfreefwd = |
1154 | cpu_to_le32(imap->im_agctl[agno].extfree); |
1155 | iagp->extfreeback = cpu_to_le32(-1); |
1156 | imap->im_agctl[agno].extfree = iagno; |
1157 | } else { |
1158 | /* remove the iag from the ag extent list if all extents |
1159 | * are now free and place it on the inode map iag free list. |
1160 | */ |
1161 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { |
1162 | if (fwd >= 0) |
1163 | aiagp->extfreeback = iagp->extfreeback; |
1164 | |
1165 | if (back >= 0) |
1166 | biagp->extfreefwd = iagp->extfreefwd; |
1167 | else |
1168 | imap->im_agctl[agno].extfree = |
1169 | le32_to_cpu(iagp->extfreefwd); |
1170 | |
1171 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); |
1172 | |
1173 | IAGFREE_LOCK(imap); |
1174 | iagp->iagfree = cpu_to_le32(imap->im_freeiag); |
1175 | imap->im_freeiag = iagno; |
1176 | IAGFREE_UNLOCK(imap); |
1177 | } |
1178 | } |
1179 | |
1180 | /* remove the iag from the ag inode free list if freeing |
1181 | * this extent causes the iag to have no free inodes. |
1182 | */ |
1183 | if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { |
1184 | if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) |
1185 | ciagp->inofreeback = iagp->inofreeback; |
1186 | |
1187 | if ((int) le32_to_cpu(iagp->inofreeback) >= 0) |
1188 | diagp->inofreefwd = iagp->inofreefwd; |
1189 | else |
1190 | imap->im_agctl[agno].inofree = |
1191 | le32_to_cpu(iagp->inofreefwd); |
1192 | |
1193 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); |
1194 | } |
1195 | |
1196 | /* update the inode extent address and working map |
1197 | * to reflect the free extent. |
1198 | * the permanent map should have been updated already |
1199 | * for the inode being freed. |
1200 | */ |
1201 | if (iagp->pmap[extno] != 0) { |
1202 | jfs_error(ip->i_sb, "diFree: the pmap does not show inode free"); |
1203 | } |
1204 | iagp->wmap[extno] = 0; |
1205 | PXDlength(&iagp->inoext[extno], 0); |
1206 | PXDaddress(&iagp->inoext[extno], 0); |
1207 | |
1208 | /* update the free extent and free inode summary maps |
1209 | * to reflect the freed extent. |
1210 | * the inode summary map is marked to indicate no inodes |
1211 | * available for the freed extent. |
1212 | */ |
1213 | sword = extno >> L2EXTSPERSUM; |
1214 | bitno = extno & (EXTSPERSUM - 1); |
1215 | mask = HIGHORDER >> bitno; |
1216 | iagp->inosmap[sword] |= cpu_to_le32(mask); |
1217 | iagp->extsmap[sword] &= cpu_to_le32(~mask); |
1218 | |
1219 | /* update the number of free inodes and number of free extents |
1220 | * for the iag. |
1221 | */ |
1222 | le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1)); |
1223 | le32_add_cpu(&iagp->nfreeexts, 1); |
1224 | |
1225 | /* update the number of free inodes and backed inodes |
1226 | * at the ag and inode map level. |
1227 | */ |
1228 | imap->im_agctl[agno].numfree -= (INOSPEREXT - 1); |
1229 | imap->im_agctl[agno].numinos -= INOSPEREXT; |
1230 | atomic_sub(INOSPEREXT - 1, &imap->im_numfree); |
1231 | atomic_sub(INOSPEREXT, &imap->im_numinos); |
1232 | |
1233 | if (amp) |
1234 | write_metapage(amp); |
1235 | if (bmp) |
1236 | write_metapage(bmp); |
1237 | if (cmp) |
1238 | write_metapage(cmp); |
1239 | if (dmp) |
1240 | write_metapage(dmp); |
1241 | |
1242 | /* |
1243 | * start transaction to update block allocation map |
1244 | * for the inode extent freed; |
1245 | * |
1246 | * N.B. AG_LOCK is released and iag will be released below, and |
1247 | * other thread may allocate inode from/reusing the ixad freed |
1248 | * BUT with new/different backing inode extent from the extent |
1249 | * to be freed by the transaction; |
1250 | */ |
1251 | tid = txBegin(ipimap->i_sb, COMMIT_FORCE); |
1252 | mutex_lock(&JFS_IP(ipimap)->commit_mutex); |
1253 | |
1254 | /* acquire tlock of the iag page of the freed ixad |
1255 | * to force the page NOHOMEOK (even though no data is |
1256 | * logged from the iag page) until NOREDOPAGE|FREEXTENT log |
1257 | * for the free of the extent is committed; |
1258 | * write FREEXTENT|NOREDOPAGE log record |
1259 | * N.B. linelock is overlaid as freed extent descriptor; |
1260 | */ |
1261 | tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE); |
1262 | pxdlock = (struct pxd_lock *) & tlck->lock; |
1263 | pxdlock->flag = mlckFREEPXD; |
1264 | pxdlock->pxd = freepxd; |
1265 | pxdlock->index = 1; |
1266 | |
1267 | write_metapage(mp); |
1268 | |
1269 | iplist[0] = ipimap; |
1270 | |
1271 | /* |
1272 | * logredo needs the IAG number and IAG extent index in order |
1273 | * to ensure that the IMap is consistent. The least disruptive |
1274 | * way to pass these values through to the transaction manager |
1275 | * is in the iplist array. |
1276 | * |
1277 | * It's not pretty, but it works. |
1278 | */ |
1279 | iplist[1] = (struct inode *) (size_t)iagno; |
1280 | iplist[2] = (struct inode *) (size_t)extno; |
1281 | |
1282 | rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); |
1283 | |
1284 | txEnd(tid); |
1285 | mutex_unlock(&JFS_IP(ipimap)->commit_mutex); |
1286 | |
1287 | /* unlock the AG inode map information */ |
1288 | AG_UNLOCK(imap, agno); |
1289 | |
1290 | return (0); |
1291 | |
1292 | error_out: |
1293 | IREAD_UNLOCK(ipimap); |
1294 | |
1295 | if (amp) |
1296 | release_metapage(amp); |
1297 | if (bmp) |
1298 | release_metapage(bmp); |
1299 | if (cmp) |
1300 | release_metapage(cmp); |
1301 | if (dmp) |
1302 | release_metapage(dmp); |
1303 | |
1304 | AG_UNLOCK(imap, agno); |
1305 | |
1306 | release_metapage(mp); |
1307 | |
1308 | return (rc); |
1309 | } |
1310 | |
1311 | /* |
1312 | * There are several places in the diAlloc* routines where we initialize |
1313 | * the inode. |
1314 | */ |
1315 | static inline void |
1316 | diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp) |
1317 | { |
1318 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); |
1319 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); |
1320 | |
1321 | ip->i_ino = (iagno << L2INOSPERIAG) + ino; |
1322 | jfs_ip->ixpxd = iagp->inoext[extno]; |
1323 | jfs_ip->agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); |
1324 | jfs_ip->active_ag = -1; |
1325 | } |
1326 | |
1327 | |
1328 | /* |
1329 | * NAME: diAlloc(pip,dir,ip) |
1330 | * |
1331 | * FUNCTION: allocate a disk inode from the inode working map |
1332 | * for a fileset or aggregate. |
1333 | * |
1334 | * PARAMETERS: |
1335 | * pip - pointer to incore inode for the parent inode. |
1336 | * dir - 'true' if the new disk inode is for a directory. |
1337 | * ip - pointer to a new inode |
1338 | * |
1339 | * RETURN VALUES: |
1340 | * 0 - success. |
1341 | * -ENOSPC - insufficient disk resources. |
1342 | * -EIO - i/o error. |
1343 | */ |
1344 | int diAlloc(struct inode *pip, bool dir, struct inode *ip) |
1345 | { |
1346 | int rc, ino, iagno, addext, extno, bitno, sword; |
1347 | int nwords, rem, i, agno; |
1348 | u32 mask, inosmap, extsmap; |
1349 | struct inode *ipimap; |
1350 | struct metapage *mp; |
1351 | ino_t inum; |
1352 | struct iag *iagp; |
1353 | struct inomap *imap; |
1354 | |
1355 | /* get the pointers to the inode map inode and the |
1356 | * corresponding imap control structure. |
1357 | */ |
1358 | ipimap = JFS_SBI(pip->i_sb)->ipimap; |
1359 | imap = JFS_IP(ipimap)->i_imap; |
1360 | JFS_IP(ip)->ipimap = ipimap; |
1361 | JFS_IP(ip)->fileset = FILESYSTEM_I; |
1362 | |
1363 | /* for a directory, the allocation policy is to start |
1364 | * at the ag level using the preferred ag. |
1365 | */ |
1366 | if (dir) { |
1367 | agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); |
1368 | AG_LOCK(imap, agno); |
1369 | goto tryag; |
1370 | } |
1371 | |
1372 | /* for files, the policy starts off by trying to allocate from |
1373 | * the same iag containing the parent disk inode: |
1374 | * try to allocate the new disk inode close to the parent disk |
1375 | * inode, using parent disk inode number + 1 as the allocation |
1376 | * hint. (we use a left-to-right policy to attempt to avoid |
1377 | * moving backward on the disk.) compute the hint within the |
1378 | * file system and the iag. |
1379 | */ |
1380 | |
1381 | /* get the ag number of this iag */ |
1382 | agno = JFS_IP(pip)->agno; |
1383 | |
1384 | if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) { |
1385 | /* |
1386 | * There is an open file actively growing. We want to |
1387 | * allocate new inodes from a different ag to avoid |
1388 | * fragmentation problems. |
1389 | */ |
1390 | agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); |
1391 | AG_LOCK(imap, agno); |
1392 | goto tryag; |
1393 | } |
1394 | |
1395 | inum = pip->i_ino + 1; |
1396 | ino = inum & (INOSPERIAG - 1); |
1397 | |
1398 | /* back off the hint if it is outside of the iag */ |
1399 | if (ino == 0) |
1400 | inum = pip->i_ino; |
1401 | |
1402 | /* lock the AG inode map information */ |
1403 | AG_LOCK(imap, agno); |
1404 | |
1405 | /* Get read lock on imap inode */ |
1406 | IREAD_LOCK(ipimap, RDWRLOCK_IMAP); |
1407 | |
1408 | /* get the iag number and read the iag */ |
1409 | iagno = INOTOIAG(inum); |
1410 | if ((rc = diIAGRead(imap, iagno, &mp))) { |
1411 | IREAD_UNLOCK(ipimap); |
1412 | AG_UNLOCK(imap, agno); |
1413 | return (rc); |
1414 | } |
1415 | iagp = (struct iag *) mp->data; |
1416 | |
1417 | /* determine if new inode extent is allowed to be added to the iag. |
1418 | * new inode extent can be added to the iag if the ag |
1419 | * has less than 32 free disk inodes and the iag has free extents. |
1420 | */ |
1421 | addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts); |
1422 | |
1423 | /* |
1424 | * try to allocate from the IAG |
1425 | */ |
1426 | /* check if the inode may be allocated from the iag |
1427 | * (i.e. the inode has free inodes or new extent can be added). |
1428 | */ |
1429 | if (iagp->nfreeinos || addext) { |
1430 | /* determine the extent number of the hint. |
1431 | */ |
1432 | extno = ino >> L2INOSPEREXT; |
1433 | |
1434 | /* check if the extent containing the hint has backed |
1435 | * inodes. if so, try to allocate within this extent. |
1436 | */ |
1437 | if (addressPXD(&iagp->inoext[extno])) { |
1438 | bitno = ino & (INOSPEREXT - 1); |
1439 | if ((bitno = |
1440 | diFindFree(le32_to_cpu(iagp->wmap[extno]), |
1441 | bitno)) |
1442 | < INOSPEREXT) { |
1443 | ino = (extno << L2INOSPEREXT) + bitno; |
1444 | |
1445 | /* a free inode (bit) was found within this |
1446 | * extent, so allocate it. |
1447 | */ |
1448 | rc = diAllocBit(imap, iagp, ino); |
1449 | IREAD_UNLOCK(ipimap); |
1450 | if (rc) { |
1451 | assert(rc == -EIO); |
1452 | } else { |
1453 | /* set the results of the allocation |
1454 | * and write the iag. |
1455 | */ |
1456 | diInitInode(ip, iagno, ino, extno, |
1457 | iagp); |
1458 | mark_metapage_dirty(mp); |
1459 | } |
1460 | release_metapage(mp); |
1461 | |
1462 | /* free the AG lock and return. |
1463 | */ |
1464 | AG_UNLOCK(imap, agno); |
1465 | return (rc); |
1466 | } |
1467 | |
1468 | if (!addext) |
1469 | extno = |
1470 | (extno == |
1471 | EXTSPERIAG - 1) ? 0 : extno + 1; |
1472 | } |
1473 | |
1474 | /* |
1475 | * no free inodes within the extent containing the hint. |
1476 | * |
1477 | * try to allocate from the backed extents following |
1478 | * hint or, if appropriate (i.e. addext is true), allocate |
1479 | * an extent of free inodes at or following the extent |
1480 | * containing the hint. |
1481 | * |
1482 | * the free inode and free extent summary maps are used |
1483 | * here, so determine the starting summary map position |
1484 | * and the number of words we'll have to examine. again, |
1485 | * the approach is to allocate following the hint, so we |
1486 | * might have to initially ignore prior bits of the summary |
1487 | * map that represent extents prior to the extent containing |
1488 | * the hint and later revisit these bits. |
1489 | */ |
1490 | bitno = extno & (EXTSPERSUM - 1); |
1491 | nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1; |
1492 | sword = extno >> L2EXTSPERSUM; |
1493 | |
1494 | /* mask any prior bits for the starting words of the |
1495 | * summary map. |
1496 | */ |
1497 | mask = ONES << (EXTSPERSUM - bitno); |
1498 | inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask; |
1499 | extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask; |
1500 | |
1501 | /* scan the free inode and free extent summary maps for |
1502 | * free resources. |
1503 | */ |
1504 | for (i = 0; i < nwords; i++) { |
1505 | /* check if this word of the free inode summary |
1506 | * map describes an extent with free inodes. |
1507 | */ |
1508 | if (~inosmap) { |
1509 | /* an extent with free inodes has been |
1510 | * found. determine the extent number |
1511 | * and the inode number within the extent. |
1512 | */ |
1513 | rem = diFindFree(inosmap, 0); |
1514 | extno = (sword << L2EXTSPERSUM) + rem; |
1515 | rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), |
1516 | 0); |
1517 | if (rem >= INOSPEREXT) { |
1518 | IREAD_UNLOCK(ipimap); |
1519 | release_metapage(mp); |
1520 | AG_UNLOCK(imap, agno); |
1521 | jfs_error(ip->i_sb, |
1522 | "diAlloc: can't find free bit " |
1523 | "in wmap"); |
1524 | return -EIO; |
1525 | } |
1526 | |
1527 | /* determine the inode number within the |
1528 | * iag and allocate the inode from the |
1529 | * map. |
1530 | */ |
1531 | ino = (extno << L2INOSPEREXT) + rem; |
1532 | rc = diAllocBit(imap, iagp, ino); |
1533 | IREAD_UNLOCK(ipimap); |
1534 | if (rc) |
1535 | assert(rc == -EIO); |
1536 | else { |
1537 | /* set the results of the allocation |
1538 | * and write the iag. |
1539 | */ |
1540 | diInitInode(ip, iagno, ino, extno, |
1541 | iagp); |
1542 | mark_metapage_dirty(mp); |
1543 | } |
1544 | release_metapage(mp); |
1545 | |
1546 | /* free the AG lock and return. |
1547 | */ |
1548 | AG_UNLOCK(imap, agno); |
1549 | return (rc); |
1550 | |
1551 | } |
1552 | |
1553 | /* check if we may allocate an extent of free |
1554 | * inodes and whether this word of the free |
1555 | * extents summary map describes a free extent. |
1556 | */ |
1557 | if (addext && ~extsmap) { |
1558 | /* a free extent has been found. determine |
1559 | * the extent number. |
1560 | */ |
1561 | rem = diFindFree(extsmap, 0); |
1562 | extno = (sword << L2EXTSPERSUM) + rem; |
1563 | |
1564 | /* allocate an extent of free inodes. |
1565 | */ |
1566 | if ((rc = diNewExt(imap, iagp, extno))) { |
1567 | /* if there is no disk space for a |
1568 | * new extent, try to allocate the |
1569 | * disk inode from somewhere else. |
1570 | */ |
1571 | if (rc == -ENOSPC) |
1572 | break; |
1573 | |
1574 | assert(rc == -EIO); |
1575 | } else { |
1576 | /* set the results of the allocation |
1577 | * and write the iag. |
1578 | */ |
1579 | diInitInode(ip, iagno, |
1580 | extno << L2INOSPEREXT, |
1581 | extno, iagp); |
1582 | mark_metapage_dirty(mp); |
1583 | } |
1584 | release_metapage(mp); |
1585 | /* free the imap inode & the AG lock & return. |
1586 | */ |
1587 | IREAD_UNLOCK(ipimap); |
1588 | AG_UNLOCK(imap, agno); |
1589 | return (rc); |
1590 | } |
1591 | |
1592 | /* move on to the next set of summary map words. |
1593 | */ |
1594 | sword = (sword == SMAPSZ - 1) ? 0 : sword + 1; |
1595 | inosmap = le32_to_cpu(iagp->inosmap[sword]); |
1596 | extsmap = le32_to_cpu(iagp->extsmap[sword]); |
1597 | } |
1598 | } |
1599 | /* unlock imap inode */ |
1600 | IREAD_UNLOCK(ipimap); |
1601 | |
1602 | /* nothing doing in this iag, so release it. */ |
1603 | release_metapage(mp); |
1604 | |
1605 | tryag: |
1606 | /* |
1607 | * try to allocate anywhere within the same AG as the parent inode. |
1608 | */ |
1609 | rc = diAllocAG(imap, agno, dir, ip); |
1610 | |
1611 | AG_UNLOCK(imap, agno); |
1612 | |
1613 | if (rc != -ENOSPC) |
1614 | return (rc); |
1615 | |
1616 | /* |
1617 | * try to allocate in any AG. |
1618 | */ |
1619 | return (diAllocAny(imap, agno, dir, ip)); |
1620 | } |
1621 | |
1622 | |
1623 | /* |
1624 | * NAME: diAllocAG(imap,agno,dir,ip) |
1625 | * |
1626 | * FUNCTION: allocate a disk inode from the allocation group. |
1627 | * |
1628 | * this routine first determines if a new extent of free |
1629 | * inodes should be added for the allocation group, with |
1630 | * the current request satisfied from this extent. if this |
1631 | * is the case, an attempt will be made to do just that. if |
1632 | * this attempt fails or it has been determined that a new |
1633 | * extent should not be added, an attempt is made to satisfy |
1634 | * the request by allocating an existing (backed) free inode |
1635 | * from the allocation group. |
1636 | * |
1637 | * PRE CONDITION: Already have the AG lock for this AG. |
1638 | * |
1639 | * PARAMETERS: |
1640 | * imap - pointer to inode map control structure. |
1641 | * agno - allocation group to allocate from. |
1642 | * dir - 'true' if the new disk inode is for a directory. |
1643 | * ip - pointer to the new inode to be filled in on successful return |
1644 | * with the disk inode number allocated, its extent address |
1645 | * and the start of the ag. |
1646 | * |
1647 | * RETURN VALUES: |
1648 | * 0 - success. |
1649 | * -ENOSPC - insufficient disk resources. |
1650 | * -EIO - i/o error. |
1651 | */ |
1652 | static int |
1653 | diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip) |
1654 | { |
1655 | int rc, addext, numfree, numinos; |
1656 | |
1657 | /* get the number of free and the number of backed disk |
1658 | * inodes currently within the ag. |
1659 | */ |
1660 | numfree = imap->im_agctl[agno].numfree; |
1661 | numinos = imap->im_agctl[agno].numinos; |
1662 | |
1663 | if (numfree > numinos) { |
1664 | jfs_error(ip->i_sb, "diAllocAG: numfree > numinos"); |
1665 | return -EIO; |
1666 | } |
1667 | |
1668 | /* determine if we should allocate a new extent of free inodes |
1669 | * within the ag: for directory inodes, add a new extent |
1670 | * if there are a small number of free inodes or number of free |
1671 | * inodes is a small percentage of the number of backed inodes. |
1672 | */ |
1673 | if (dir) |
1674 | addext = (numfree < 64 || |
1675 | (numfree < 256 |
1676 | && ((numfree * 100) / numinos) <= 20)); |
1677 | else |
1678 | addext = (numfree == 0); |
1679 | |
1680 | /* |
1681 | * try to allocate a new extent of free inodes. |
1682 | */ |
1683 | if (addext) { |
1684 | /* if free space is not avaliable for this new extent, try |
1685 | * below to allocate a free and existing (already backed) |
1686 | * inode from the ag. |
1687 | */ |
1688 | if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC) |
1689 | return (rc); |
1690 | } |
1691 | |
1692 | /* |
1693 | * try to allocate an existing free inode from the ag. |
1694 | */ |
1695 | return (diAllocIno(imap, agno, ip)); |
1696 | } |
1697 | |
1698 | |
1699 | /* |
1700 | * NAME: diAllocAny(imap,agno,dir,iap) |
1701 | * |
1702 | * FUNCTION: allocate a disk inode from any other allocation group. |
1703 | * |
1704 | * this routine is called when an allocation attempt within |
1705 | * the primary allocation group has failed. if attempts to |
1706 | * allocate an inode from any allocation group other than the |
1707 | * specified primary group. |
1708 | * |
1709 | * PARAMETERS: |
1710 | * imap - pointer to inode map control structure. |
1711 | * agno - primary allocation group (to avoid). |
1712 | * dir - 'true' if the new disk inode is for a directory. |
1713 | * ip - pointer to a new inode to be filled in on successful return |
1714 | * with the disk inode number allocated, its extent address |
1715 | * and the start of the ag. |
1716 | * |
1717 | * RETURN VALUES: |
1718 | * 0 - success. |
1719 | * -ENOSPC - insufficient disk resources. |
1720 | * -EIO - i/o error. |
1721 | */ |
1722 | static int |
1723 | diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip) |
1724 | { |
1725 | int ag, rc; |
1726 | int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag; |
1727 | |
1728 | |
1729 | /* try to allocate from the ags following agno up to |
1730 | * the maximum ag number. |
1731 | */ |
1732 | for (ag = agno + 1; ag <= maxag; ag++) { |
1733 | AG_LOCK(imap, ag); |
1734 | |
1735 | rc = diAllocAG(imap, ag, dir, ip); |
1736 | |
1737 | AG_UNLOCK(imap, ag); |
1738 | |
1739 | if (rc != -ENOSPC) |
1740 | return (rc); |
1741 | } |
1742 | |
1743 | /* try to allocate from the ags in front of agno. |
1744 | */ |
1745 | for (ag = 0; ag < agno; ag++) { |
1746 | AG_LOCK(imap, ag); |
1747 | |
1748 | rc = diAllocAG(imap, ag, dir, ip); |
1749 | |
1750 | AG_UNLOCK(imap, ag); |
1751 | |
1752 | if (rc != -ENOSPC) |
1753 | return (rc); |
1754 | } |
1755 | |
1756 | /* no free disk inodes. |
1757 | */ |
1758 | return -ENOSPC; |
1759 | } |
1760 | |
1761 | |
1762 | /* |
1763 | * NAME: diAllocIno(imap,agno,ip) |
1764 | * |
1765 | * FUNCTION: allocate a disk inode from the allocation group's free |
1766 | * inode list, returning an error if this free list is |
1767 | * empty (i.e. no iags on the list). |
1768 | * |
1769 | * allocation occurs from the first iag on the list using |
1770 | * the iag's free inode summary map to find the leftmost |
1771 | * free inode in the iag. |
1772 | * |
1773 | * PRE CONDITION: Already have AG lock for this AG. |
1774 | * |
1775 | * PARAMETERS: |
1776 | * imap - pointer to inode map control structure. |
1777 | * agno - allocation group. |
1778 | * ip - pointer to new inode to be filled in on successful return |
1779 | * with the disk inode number allocated, its extent address |
1780 | * and the start of the ag. |
1781 | * |
1782 | * RETURN VALUES: |
1783 | * 0 - success. |
1784 | * -ENOSPC - insufficient disk resources. |
1785 | * -EIO - i/o error. |
1786 | */ |
1787 | static int diAllocIno(struct inomap * imap, int agno, struct inode *ip) |
1788 | { |
1789 | int iagno, ino, rc, rem, extno, sword; |
1790 | struct metapage *mp; |
1791 | struct iag *iagp; |
1792 | |
1793 | /* check if there are iags on the ag's free inode list. |
1794 | */ |
1795 | if ((iagno = imap->im_agctl[agno].inofree) < 0) |
1796 | return -ENOSPC; |
1797 | |
1798 | /* obtain read lock on imap inode */ |
1799 | IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); |
1800 | |
1801 | /* read the iag at the head of the list. |
1802 | */ |
1803 | if ((rc = diIAGRead(imap, iagno, &mp))) { |
1804 | IREAD_UNLOCK(imap->im_ipimap); |
1805 | return (rc); |
1806 | } |
1807 | iagp = (struct iag *) mp->data; |
1808 | |
1809 | /* better be free inodes in this iag if it is on the |
1810 | * list. |
1811 | */ |
1812 | if (!iagp->nfreeinos) { |
1813 | IREAD_UNLOCK(imap->im_ipimap); |
1814 | release_metapage(mp); |
1815 | jfs_error(ip->i_sb, |
1816 | "diAllocIno: nfreeinos = 0, but iag on freelist"); |
1817 | return -EIO; |
1818 | } |
1819 | |
1820 | /* scan the free inode summary map to find an extent |
1821 | * with free inodes. |
1822 | */ |
1823 | for (sword = 0;; sword++) { |
1824 | if (sword >= SMAPSZ) { |
1825 | IREAD_UNLOCK(imap->im_ipimap); |
1826 | release_metapage(mp); |
1827 | jfs_error(ip->i_sb, |
1828 | "diAllocIno: free inode not found in summary map"); |
1829 | return -EIO; |
1830 | } |
1831 | |
1832 | if (~iagp->inosmap[sword]) |
1833 | break; |
1834 | } |
1835 | |
1836 | /* found a extent with free inodes. determine |
1837 | * the extent number. |
1838 | */ |
1839 | rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0); |
1840 | if (rem >= EXTSPERSUM) { |
1841 | IREAD_UNLOCK(imap->im_ipimap); |
1842 | release_metapage(mp); |
1843 | jfs_error(ip->i_sb, "diAllocIno: no free extent found"); |
1844 | return -EIO; |
1845 | } |
1846 | extno = (sword << L2EXTSPERSUM) + rem; |
1847 | |
1848 | /* find the first free inode in the extent. |
1849 | */ |
1850 | rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0); |
1851 | if (rem >= INOSPEREXT) { |
1852 | IREAD_UNLOCK(imap->im_ipimap); |
1853 | release_metapage(mp); |
1854 | jfs_error(ip->i_sb, "diAllocIno: free inode not found"); |
1855 | return -EIO; |
1856 | } |
1857 | |
1858 | /* compute the inode number within the iag. |
1859 | */ |
1860 | ino = (extno << L2INOSPEREXT) + rem; |
1861 | |
1862 | /* allocate the inode. |
1863 | */ |
1864 | rc = diAllocBit(imap, iagp, ino); |
1865 | IREAD_UNLOCK(imap->im_ipimap); |
1866 | if (rc) { |
1867 | release_metapage(mp); |
1868 | return (rc); |
1869 | } |
1870 | |
1871 | /* set the results of the allocation and write the iag. |
1872 | */ |
1873 | diInitInode(ip, iagno, ino, extno, iagp); |
1874 | write_metapage(mp); |
1875 | |
1876 | return (0); |
1877 | } |
1878 | |
1879 | |
1880 | /* |
1881 | * NAME: diAllocExt(imap,agno,ip) |
1882 | * |
1883 | * FUNCTION: add a new extent of free inodes to an iag, allocating |
1884 | * an inode from this extent to satisfy the current allocation |
1885 | * request. |
1886 | * |
1887 | * this routine first tries to find an existing iag with free |
1888 | * extents through the ag free extent list. if list is not |
1889 | * empty, the head of the list will be selected as the home |
1890 | * of the new extent of free inodes. otherwise (the list is |
1891 | * empty), a new iag will be allocated for the ag to contain |
1892 | * the extent. |
1893 | * |
1894 | * once an iag has been selected, the free extent summary map |
1895 | * is used to locate a free extent within the iag and diNewExt() |
1896 | * is called to initialize the extent, with initialization |
1897 | * including the allocation of the first inode of the extent |
1898 | * for the purpose of satisfying this request. |
1899 | * |
1900 | * PARAMETERS: |
1901 | * imap - pointer to inode map control structure. |
1902 | * agno - allocation group number. |
1903 | * ip - pointer to new inode to be filled in on successful return |
1904 | * with the disk inode number allocated, its extent address |
1905 | * and the start of the ag. |
1906 | * |
1907 | * RETURN VALUES: |
1908 | * 0 - success. |
1909 | * -ENOSPC - insufficient disk resources. |
1910 | * -EIO - i/o error. |
1911 | */ |
1912 | static int diAllocExt(struct inomap * imap, int agno, struct inode *ip) |
1913 | { |
1914 | int rem, iagno, sword, extno, rc; |
1915 | struct metapage *mp; |
1916 | struct iag *iagp; |
1917 | |
1918 | /* check if the ag has any iags with free extents. if not, |
1919 | * allocate a new iag for the ag. |
1920 | */ |
1921 | if ((iagno = imap->im_agctl[agno].extfree) < 0) { |
1922 | /* If successful, diNewIAG will obtain the read lock on the |
1923 | * imap inode. |
1924 | */ |
1925 | if ((rc = diNewIAG(imap, &iagno, agno, &mp))) { |
1926 | return (rc); |
1927 | } |
1928 | iagp = (struct iag *) mp->data; |
1929 | |
1930 | /* set the ag number if this a brand new iag |
1931 | */ |
1932 | iagp->agstart = |
1933 | cpu_to_le64(AGTOBLK(agno, imap->im_ipimap)); |
1934 | } else { |
1935 | /* read the iag. |
1936 | */ |
1937 | IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); |
1938 | if ((rc = diIAGRead(imap, iagno, &mp))) { |
1939 | IREAD_UNLOCK(imap->im_ipimap); |
1940 | jfs_error(ip->i_sb, "diAllocExt: error reading iag"); |
1941 | return rc; |
1942 | } |
1943 | iagp = (struct iag *) mp->data; |
1944 | } |
1945 | |
1946 | /* using the free extent summary map, find a free extent. |
1947 | */ |
1948 | for (sword = 0;; sword++) { |
1949 | if (sword >= SMAPSZ) { |
1950 | release_metapage(mp); |
1951 | IREAD_UNLOCK(imap->im_ipimap); |
1952 | jfs_error(ip->i_sb, |
1953 | "diAllocExt: free ext summary map not found"); |
1954 | return -EIO; |
1955 | } |
1956 | if (~iagp->extsmap[sword]) |
1957 | break; |
1958 | } |
1959 | |
1960 | /* determine the extent number of the free extent. |
1961 | */ |
1962 | rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0); |
1963 | if (rem >= EXTSPERSUM) { |
1964 | release_metapage(mp); |
1965 | IREAD_UNLOCK(imap->im_ipimap); |
1966 | jfs_error(ip->i_sb, "diAllocExt: free extent not found"); |
1967 | return -EIO; |
1968 | } |
1969 | extno = (sword << L2EXTSPERSUM) + rem; |
1970 | |
1971 | /* initialize the new extent. |
1972 | */ |
1973 | rc = diNewExt(imap, iagp, extno); |
1974 | IREAD_UNLOCK(imap->im_ipimap); |
1975 | if (rc) { |
1976 | /* something bad happened. if a new iag was allocated, |
1977 | * place it back on the inode map's iag free list, and |
1978 | * clear the ag number information. |
1979 | */ |
1980 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { |
1981 | IAGFREE_LOCK(imap); |
1982 | iagp->iagfree = cpu_to_le32(imap->im_freeiag); |
1983 | imap->im_freeiag = iagno; |
1984 | IAGFREE_UNLOCK(imap); |
1985 | } |
1986 | write_metapage(mp); |
1987 | return (rc); |
1988 | } |
1989 | |
1990 | /* set the results of the allocation and write the iag. |
1991 | */ |
1992 | diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp); |
1993 | |
1994 | write_metapage(mp); |
1995 | |
1996 | return (0); |
1997 | } |
1998 | |
1999 | |
2000 | /* |
2001 | * NAME: diAllocBit(imap,iagp,ino) |
2002 | * |
2003 | * FUNCTION: allocate a backed inode from an iag. |
2004 | * |
2005 | * this routine performs the mechanics of allocating a |
2006 | * specified inode from a backed extent. |
2007 | * |
2008 | * if the inode to be allocated represents the last free |
2009 | * inode within the iag, the iag will be removed from the |
2010 | * ag free inode list. |
2011 | * |
2012 | * a careful update approach is used to provide consistency |
2013 | * in the face of updates to multiple buffers. under this |
2014 | * approach, all required buffers are obtained before making |
2015 | * any updates and are held all are updates are complete. |
2016 | * |
2017 | * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on |
2018 | * this AG. Must have read lock on imap inode. |
2019 | * |
2020 | * PARAMETERS: |
2021 | * imap - pointer to inode map control structure. |
2022 | * iagp - pointer to iag. |
2023 | * ino - inode number to be allocated within the iag. |
2024 | * |
2025 | * RETURN VALUES: |
2026 | * 0 - success. |
2027 | * -ENOSPC - insufficient disk resources. |
2028 | * -EIO - i/o error. |
2029 | */ |
2030 | static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino) |
2031 | { |
2032 | int extno, bitno, agno, sword, rc; |
2033 | struct metapage *amp = NULL, *bmp = NULL; |
2034 | struct iag *aiagp = NULL, *biagp = NULL; |
2035 | u32 mask; |
2036 | |
2037 | /* check if this is the last free inode within the iag. |
2038 | * if so, it will have to be removed from the ag free |
2039 | * inode list, so get the iags preceeding and following |
2040 | * it on the list. |
2041 | */ |
2042 | if (iagp->nfreeinos == cpu_to_le32(1)) { |
2043 | if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) { |
2044 | if ((rc = |
2045 | diIAGRead(imap, le32_to_cpu(iagp->inofreefwd), |
2046 | &))) |
2047 | return (rc); |
2048 | aiagp = (struct iag *) amp->data; |
2049 | } |
2050 | |
2051 | if ((int) le32_to_cpu(iagp->inofreeback) >= 0) { |
2052 | if ((rc = |
2053 | diIAGRead(imap, |
2054 | le32_to_cpu(iagp->inofreeback), |
2055 | &bmp))) { |
2056 | if (amp) |
2057 | release_metapage(amp); |
2058 | return (rc); |
2059 | } |
2060 | biagp = (struct iag *) bmp->data; |
2061 | } |
2062 | } |
2063 | |
2064 | /* get the ag number, extent number, inode number within |
2065 | * the extent. |
2066 | */ |
2067 | agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb)); |
2068 | extno = ino >> L2INOSPEREXT; |
2069 | bitno = ino & (INOSPEREXT - 1); |
2070 | |
2071 | /* compute the mask for setting the map. |
2072 | */ |
2073 | mask = HIGHORDER >> bitno; |
2074 | |
2075 | /* the inode should be free and backed. |
2076 | */ |
2077 | if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) || |
2078 | ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) || |
2079 | (addressPXD(&iagp->inoext[extno]) == 0)) { |
2080 | if (amp) |
2081 | release_metapage(amp); |
2082 | if (bmp) |
2083 | release_metapage(bmp); |
2084 | |
2085 | jfs_error(imap->im_ipimap->i_sb, |
2086 | "diAllocBit: iag inconsistent"); |
2087 | return -EIO; |
2088 | } |
2089 | |
2090 | /* mark the inode as allocated in the working map. |
2091 | */ |
2092 | iagp->wmap[extno] |= cpu_to_le32(mask); |
2093 | |
2094 | /* check if all inodes within the extent are now |
2095 | * allocated. if so, update the free inode summary |
2096 | * map to reflect this. |
2097 | */ |
2098 | if (iagp->wmap[extno] == cpu_to_le32(ONES)) { |
2099 | sword = extno >> L2EXTSPERSUM; |
2100 | bitno = extno & (EXTSPERSUM - 1); |
2101 | iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno); |
2102 | } |
2103 | |
2104 | /* if this was the last free inode in the iag, remove the |
2105 | * iag from the ag free inode list. |
2106 | */ |
2107 | if (iagp->nfreeinos == cpu_to_le32(1)) { |
2108 | if (amp) { |
2109 | aiagp->inofreeback = iagp->inofreeback; |
2110 | write_metapage(amp); |
2111 | } |
2112 | |
2113 | if (bmp) { |
2114 | biagp->inofreefwd = iagp->inofreefwd; |
2115 | write_metapage(bmp); |
2116 | } else { |
2117 | imap->im_agctl[agno].inofree = |
2118 | le32_to_cpu(iagp->inofreefwd); |
2119 | } |
2120 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); |
2121 | } |
2122 | |
2123 | /* update the free inode count at the iag, ag, inode |
2124 | * map levels. |
2125 | */ |
2126 | le32_add_cpu(&iagp->nfreeinos, -1); |
2127 | imap->im_agctl[agno].numfree -= 1; |
2128 | atomic_dec(&imap->im_numfree); |
2129 | |
2130 | return (0); |
2131 | } |
2132 | |
2133 | |
2134 | /* |
2135 | * NAME: diNewExt(imap,iagp,extno) |
2136 | * |
2137 | * FUNCTION: initialize a new extent of inodes for an iag, allocating |
2138 | * the first inode of the extent for use for the current |
2139 | * allocation request. |
2140 | * |
2141 | * disk resources are allocated for the new extent of inodes |
2142 | * and the inodes themselves are initialized to reflect their |
2143 | * existence within the extent (i.e. their inode numbers and |
2144 | * inode extent addresses are set) and their initial state |
2145 | * (mode and link count are set to zero). |
2146 | * |
2147 | * if the iag is new, it is not yet on an ag extent free list |
2148 | * but will now be placed on this list. |
2149 | * |
2150 | * if the allocation of the new extent causes the iag to |
2151 | * have no free extent, the iag will be removed from the |
2152 | * ag extent free list. |
2153 | * |
2154 | * if the iag has no free backed inodes, it will be placed |
2155 | * on the ag free inode list, since the addition of the new |
2156 | * extent will now cause it to have free inodes. |
2157 | * |
2158 | * a careful update approach is used to provide consistency |
2159 | * (i.e. list consistency) in the face of updates to multiple |
2160 | * buffers. under this approach, all required buffers are |
2161 | * obtained before making any updates and are held until all |
2162 | * updates are complete. |
2163 | * |
2164 | * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on |
2165 | * this AG. Must have read lock on imap inode. |
2166 | * |
2167 | * PARAMETERS: |
2168 | * imap - pointer to inode map control structure. |
2169 | * iagp - pointer to iag. |
2170 | * extno - extent number. |
2171 | * |
2172 | * RETURN VALUES: |
2173 | * 0 - success. |
2174 | * -ENOSPC - insufficient disk resources. |
2175 | * -EIO - i/o error. |
2176 | */ |
2177 | static int diNewExt(struct inomap * imap, struct iag * iagp, int extno) |
2178 | { |
2179 | int agno, iagno, fwd, back, freei = 0, sword, rc; |
2180 | struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL; |
2181 | struct metapage *amp, *bmp, *cmp, *dmp; |
2182 | struct inode *ipimap; |
2183 | s64 blkno, hint; |
2184 | int i, j; |
2185 | u32 mask; |
2186 | ino_t ino; |
2187 | struct dinode *dp; |
2188 | struct jfs_sb_info *sbi; |
2189 | |
2190 | /* better have free extents. |
2191 | */ |
2192 | if (!iagp->nfreeexts) { |
2193 | jfs_error(imap->im_ipimap->i_sb, "diNewExt: no free extents"); |
2194 | return -EIO; |
2195 | } |
2196 | |
2197 | /* get the inode map inode. |
2198 | */ |
2199 | ipimap = imap->im_ipimap; |
2200 | sbi = JFS_SBI(ipimap->i_sb); |
2201 | |
2202 | amp = bmp = cmp = NULL; |
2203 | |
2204 | /* get the ag and iag numbers for this iag. |
2205 | */ |
2206 | agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); |
2207 | iagno = le32_to_cpu(iagp->iagnum); |
2208 | |
2209 | /* check if this is the last free extent within the |
2210 | * iag. if so, the iag must be removed from the ag |
2211 | * free extent list, so get the iags preceeding and |
2212 | * following the iag on this list. |
2213 | */ |
2214 | if (iagp->nfreeexts == cpu_to_le32(1)) { |
2215 | if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { |
2216 | if ((rc = diIAGRead(imap, fwd, &))) |
2217 | return (rc); |
2218 | aiagp = (struct iag *) amp->data; |
2219 | } |
2220 | |
2221 | if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { |
2222 | if ((rc = diIAGRead(imap, back, &bmp))) |
2223 | goto error_out; |
2224 | biagp = (struct iag *) bmp->data; |
2225 | } |
2226 | } else { |
2227 | /* the iag has free extents. if all extents are free |
2228 | * (as is the case for a newly allocated iag), the iag |
2229 | * must be added to the ag free extent list, so get |
2230 | * the iag at the head of the list in preparation for |
2231 | * adding this iag to this list. |
2232 | */ |
2233 | fwd = back = -1; |
2234 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { |
2235 | if ((fwd = imap->im_agctl[agno].extfree) >= 0) { |
2236 | if ((rc = diIAGRead(imap, fwd, &))) |
2237 | goto error_out; |
2238 | aiagp = (struct iag *) amp->data; |
2239 | } |
2240 | } |
2241 | } |
2242 | |
2243 | /* check if the iag has no free inodes. if so, the iag |
2244 | * will have to be added to the ag free inode list, so get |
2245 | * the iag at the head of the list in preparation for |
2246 | * adding this iag to this list. in doing this, we must |
2247 | * check if we already have the iag at the head of |
2248 | * the list in hand. |
2249 | */ |
2250 | if (iagp->nfreeinos == 0) { |
2251 | freei = imap->im_agctl[agno].inofree; |
2252 | |
2253 | if (freei >= 0) { |
2254 | if (freei == fwd) { |
2255 | ciagp = aiagp; |
2256 | } else if (freei == back) { |
2257 | ciagp = biagp; |
2258 | } else { |
2259 | if ((rc = diIAGRead(imap, freei, &cmp))) |
2260 | goto error_out; |
2261 | ciagp = (struct iag *) cmp->data; |
2262 | } |
2263 | if (ciagp == NULL) { |
2264 | jfs_error(imap->im_ipimap->i_sb, |
2265 | "diNewExt: ciagp == NULL"); |
2266 | rc = -EIO; |
2267 | goto error_out; |
2268 | } |
2269 | } |
2270 | } |
2271 | |
2272 | /* allocate disk space for the inode extent. |
2273 | */ |
2274 | if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0)) |
2275 | hint = ((s64) agno << sbi->bmap->db_agl2size) - 1; |
2276 | else |
2277 | hint = addressPXD(&iagp->inoext[extno - 1]) + |
2278 | lengthPXD(&iagp->inoext[extno - 1]) - 1; |
2279 | |
2280 | if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno))) |
2281 | goto error_out; |
2282 | |
2283 | /* compute the inode number of the first inode within the |
2284 | * extent. |
2285 | */ |
2286 | ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT); |
2287 | |
2288 | /* initialize the inodes within the newly allocated extent a |
2289 | * page at a time. |
2290 | */ |
2291 | for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) { |
2292 | /* get a buffer for this page of disk inodes. |
2293 | */ |
2294 | dmp = get_metapage(ipimap, blkno + i, PSIZE, 1); |
2295 | if (dmp == NULL) { |
2296 | rc = -EIO; |
2297 | goto error_out; |
2298 | } |
2299 | dp = (struct dinode *) dmp->data; |
2300 | |
2301 | /* initialize the inode number, mode, link count and |
2302 | * inode extent address. |
2303 | */ |
2304 | for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) { |
2305 | dp->di_inostamp = cpu_to_le32(sbi->inostamp); |
2306 | dp->di_number = cpu_to_le32(ino); |
2307 | dp->di_fileset = cpu_to_le32(FILESYSTEM_I); |
2308 | dp->di_mode = 0; |
2309 | dp->di_nlink = 0; |
2310 | PXDaddress(&(dp->di_ixpxd), blkno); |
2311 | PXDlength(&(dp->di_ixpxd), imap->im_nbperiext); |
2312 | } |
2313 | write_metapage(dmp); |
2314 | } |
2315 | |
2316 | /* if this is the last free extent within the iag, remove the |
2317 | * iag from the ag free extent list. |
2318 | */ |
2319 | if (iagp->nfreeexts == cpu_to_le32(1)) { |
2320 | if (fwd >= 0) |
2321 | aiagp->extfreeback = iagp->extfreeback; |
2322 | |
2323 | if (back >= 0) |
2324 | biagp->extfreefwd = iagp->extfreefwd; |
2325 | else |
2326 | imap->im_agctl[agno].extfree = |
2327 | le32_to_cpu(iagp->extfreefwd); |
2328 | |
2329 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); |
2330 | } else { |
2331 | /* if the iag has all free extents (newly allocated iag), |
2332 | * add the iag to the ag free extent list. |
2333 | */ |
2334 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { |
2335 | if (fwd >= 0) |
2336 | aiagp->extfreeback = cpu_to_le32(iagno); |
2337 | |
2338 | iagp->extfreefwd = cpu_to_le32(fwd); |
2339 | iagp->extfreeback = cpu_to_le32(-1); |
2340 | imap->im_agctl[agno].extfree = iagno; |
2341 | } |
2342 | } |
2343 | |
2344 | /* if the iag has no free inodes, add the iag to the |
2345 | * ag free inode list. |
2346 | */ |
2347 | if (iagp->nfreeinos == 0) { |
2348 | if (freei >= 0) |
2349 | ciagp->inofreeback = cpu_to_le32(iagno); |
2350 | |
2351 | iagp->inofreefwd = |
2352 | cpu_to_le32(imap->im_agctl[agno].inofree); |
2353 | iagp->inofreeback = cpu_to_le32(-1); |
2354 | imap->im_agctl[agno].inofree = iagno; |
2355 | } |
2356 | |
2357 | /* initialize the extent descriptor of the extent. */ |
2358 | PXDlength(&iagp->inoext[extno], imap->im_nbperiext); |
2359 | PXDaddress(&iagp->inoext[extno], blkno); |
2360 | |
2361 | /* initialize the working and persistent map of the extent. |
2362 | * the working map will be initialized such that |
2363 | * it indicates the first inode of the extent is allocated. |
2364 | */ |
2365 | iagp->wmap[extno] = cpu_to_le32(HIGHORDER); |
2366 | iagp->pmap[extno] = 0; |
2367 | |
2368 | /* update the free inode and free extent summary maps |
2369 | * for the extent to indicate the extent has free inodes |
2370 | * and no longer represents a free extent. |
2371 | */ |
2372 | sword = extno >> L2EXTSPERSUM; |
2373 | mask = HIGHORDER >> (extno & (EXTSPERSUM - 1)); |
2374 | iagp->extsmap[sword] |= cpu_to_le32(mask); |
2375 | iagp->inosmap[sword] &= cpu_to_le32(~mask); |
2376 | |
2377 | /* update the free inode and free extent counts for the |
2378 | * iag. |
2379 | */ |
2380 | le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1)); |
2381 | le32_add_cpu(&iagp->nfreeexts, -1); |
2382 | |
2383 | /* update the free and backed inode counts for the ag. |
2384 | */ |
2385 | imap->im_agctl[agno].numfree += (INOSPEREXT - 1); |
2386 | imap->im_agctl[agno].numinos += INOSPEREXT; |
2387 | |
2388 | /* update the free and backed inode counts for the inode map. |
2389 | */ |
2390 | atomic_add(INOSPEREXT - 1, &imap->im_numfree); |
2391 | atomic_add(INOSPEREXT, &imap->im_numinos); |
2392 | |
2393 | /* write the iags. |
2394 | */ |
2395 | if (amp) |
2396 | write_metapage(amp); |
2397 | if (bmp) |
2398 | write_metapage(bmp); |
2399 | if (cmp) |
2400 | write_metapage(cmp); |
2401 | |
2402 | return (0); |
2403 | |
2404 | error_out: |
2405 | |
2406 | /* release the iags. |
2407 | */ |
2408 | if (amp) |
2409 | release_metapage(amp); |
2410 | if (bmp) |
2411 | release_metapage(bmp); |
2412 | if (cmp) |
2413 | release_metapage(cmp); |
2414 | |
2415 | return (rc); |
2416 | } |
2417 | |
2418 | |
2419 | /* |
2420 | * NAME: diNewIAG(imap,iagnop,agno) |
2421 | * |
2422 | * FUNCTION: allocate a new iag for an allocation group. |
2423 | * |
2424 | * first tries to allocate the iag from the inode map |
2425 | * iagfree list: |
2426 | * if the list has free iags, the head of the list is removed |
2427 | * and returned to satisfy the request. |
2428 | * if the inode map's iag free list is empty, the inode map |
2429 | * is extended to hold a new iag. this new iag is initialized |
2430 | * and returned to satisfy the request. |
2431 | * |
2432 | * PARAMETERS: |
2433 | * imap - pointer to inode map control structure. |
2434 | * iagnop - pointer to an iag number set with the number of the |
2435 | * newly allocated iag upon successful return. |
2436 | * agno - allocation group number. |
2437 | * bpp - Buffer pointer to be filled in with new IAG's buffer |
2438 | * |
2439 | * RETURN VALUES: |
2440 | * 0 - success. |
2441 | * -ENOSPC - insufficient disk resources. |
2442 | * -EIO - i/o error. |
2443 | * |
2444 | * serialization: |
2445 | * AG lock held on entry/exit; |
2446 | * write lock on the map is held inside; |
2447 | * read lock on the map is held on successful completion; |
2448 | * |
2449 | * note: new iag transaction: |
2450 | * . synchronously write iag; |
2451 | * . write log of xtree and inode of imap; |
2452 | * . commit; |
2453 | * . synchronous write of xtree (right to left, bottom to top); |
2454 | * . at start of logredo(): init in-memory imap with one additional iag page; |
2455 | * . at end of logredo(): re-read imap inode to determine |
2456 | * new imap size; |
2457 | */ |
2458 | static int |
2459 | diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) |
2460 | { |
2461 | int rc; |
2462 | int iagno, i, xlen; |
2463 | struct inode *ipimap; |
2464 | struct super_block *sb; |
2465 | struct jfs_sb_info *sbi; |
2466 | struct metapage *mp; |
2467 | struct iag *iagp; |
2468 | s64 xaddr = 0; |
2469 | s64 blkno; |
2470 | tid_t tid; |
2471 | struct inode *iplist[1]; |
2472 | |
2473 | /* pick up pointers to the inode map and mount inodes */ |
2474 | ipimap = imap->im_ipimap; |
2475 | sb = ipimap->i_sb; |
2476 | sbi = JFS_SBI(sb); |
2477 | |
2478 | /* acquire the free iag lock */ |
2479 | IAGFREE_LOCK(imap); |
2480 | |
2481 | /* if there are any iags on the inode map free iag list, |
2482 | * allocate the iag from the head of the list. |
2483 | */ |
2484 | if (imap->im_freeiag >= 0) { |
2485 | /* pick up the iag number at the head of the list */ |
2486 | iagno = imap->im_freeiag; |
2487 | |
2488 | /* determine the logical block number of the iag */ |
2489 | blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); |
2490 | } else { |
2491 | /* no free iags. the inode map will have to be extented |
2492 | * to include a new iag. |
2493 | */ |
2494 | |
2495 | /* acquire inode map lock */ |
2496 | IWRITE_LOCK(ipimap, RDWRLOCK_IMAP); |
2497 | |
2498 | if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) { |
2499 | IWRITE_UNLOCK(ipimap); |
2500 | IAGFREE_UNLOCK(imap); |
2501 | jfs_error(imap->im_ipimap->i_sb, |
2502 | "diNewIAG: ipimap->i_size is wrong"); |
2503 | return -EIO; |
2504 | } |
2505 | |
2506 | |
2507 | /* get the next avaliable iag number */ |
2508 | iagno = imap->im_nextiag; |
2509 | |
2510 | /* make sure that we have not exceeded the maximum inode |
2511 | * number limit. |
2512 | */ |
2513 | if (iagno > (MAXIAGS - 1)) { |
2514 | /* release the inode map lock */ |
2515 | IWRITE_UNLOCK(ipimap); |
2516 | |
2517 | rc = -ENOSPC; |
2518 | goto out; |
2519 | } |
2520 | |
2521 | /* |
2522 | * synchronously append new iag page. |
2523 | */ |
2524 | /* determine the logical address of iag page to append */ |
2525 | blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); |
2526 | |
2527 | /* Allocate extent for new iag page */ |
2528 | xlen = sbi->nbperpage; |
2529 | if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) { |
2530 | /* release the inode map lock */ |
2531 | IWRITE_UNLOCK(ipimap); |
2532 | |
2533 | goto out; |
2534 | } |
2535 | |
2536 | /* |
2537 | * start transaction of update of the inode map |
2538 | * addressing structure pointing to the new iag page; |
2539 | */ |
2540 | tid = txBegin(sb, COMMIT_FORCE); |
2541 | mutex_lock(&JFS_IP(ipimap)->commit_mutex); |
2542 | |
2543 | /* update the inode map addressing structure to point to it */ |
2544 | if ((rc = |
2545 | xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) { |
2546 | txEnd(tid); |
2547 | mutex_unlock(&JFS_IP(ipimap)->commit_mutex); |
2548 | /* Free the blocks allocated for the iag since it was |
2549 | * not successfully added to the inode map |
2550 | */ |
2551 | dbFree(ipimap, xaddr, (s64) xlen); |
2552 | |
2553 | /* release the inode map lock */ |
2554 | IWRITE_UNLOCK(ipimap); |
2555 | |
2556 | goto out; |
2557 | } |
2558 | |
2559 | /* update the inode map's inode to reflect the extension */ |
2560 | ipimap->i_size += PSIZE; |
2561 | inode_add_bytes(ipimap, PSIZE); |
2562 | |
2563 | /* assign a buffer for the page */ |
2564 | mp = get_metapage(ipimap, blkno, PSIZE, 0); |
2565 | if (!mp) { |
2566 | /* |
2567 | * This is very unlikely since we just created the |
2568 | * extent, but let's try to handle it correctly |
2569 | */ |
2570 | xtTruncate(tid, ipimap, ipimap->i_size - PSIZE, |
2571 | COMMIT_PWMAP); |
2572 | |
2573 | txAbort(tid, 0); |
2574 | txEnd(tid); |
2575 | mutex_unlock(&JFS_IP(ipimap)->commit_mutex); |
2576 | |
2577 | /* release the inode map lock */ |
2578 | IWRITE_UNLOCK(ipimap); |
2579 | |
2580 | rc = -EIO; |
2581 | goto out; |
2582 | } |
2583 | iagp = (struct iag *) mp->data; |
2584 | |
2585 | /* init the iag */ |
2586 | memset(iagp, 0, sizeof(struct iag)); |
2587 | iagp->iagnum = cpu_to_le32(iagno); |
2588 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); |
2589 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); |
2590 | iagp->iagfree = cpu_to_le32(-1); |
2591 | iagp->nfreeinos = 0; |
2592 | iagp->nfreeexts = cpu_to_le32(EXTSPERIAG); |
2593 | |
2594 | /* initialize the free inode summary map (free extent |
2595 | * summary map initialization handled by bzero). |
2596 | */ |
2597 | for (i = 0; i < SMAPSZ; i++) |
2598 | iagp->inosmap[i] = cpu_to_le32(ONES); |
2599 | |
2600 | /* |
2601 | * Write and sync the metapage |
2602 | */ |
2603 | flush_metapage(mp); |
2604 | |
2605 | /* |
2606 | * txCommit(COMMIT_FORCE) will synchronously write address |
2607 | * index pages and inode after commit in careful update order |
2608 | * of address index pages (right to left, bottom up); |
2609 | */ |
2610 | iplist[0] = ipimap; |
2611 | rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); |
2612 | |
2613 | txEnd(tid); |
2614 | mutex_unlock(&JFS_IP(ipimap)->commit_mutex); |
2615 | |
2616 | duplicateIXtree(sb, blkno, xlen, &xaddr); |
2617 | |
2618 | /* update the next avaliable iag number */ |
2619 | imap->im_nextiag += 1; |
2620 | |
2621 | /* Add the iag to the iag free list so we don't lose the iag |
2622 | * if a failure happens now. |
2623 | */ |
2624 | imap->im_freeiag = iagno; |
2625 | |
2626 | /* Until we have logredo working, we want the imap inode & |
2627 | * control page to be up to date. |
2628 | */ |
2629 | diSync(ipimap); |
2630 | |
2631 | /* release the inode map lock */ |
2632 | IWRITE_UNLOCK(ipimap); |
2633 | } |
2634 | |
2635 | /* obtain read lock on map */ |
2636 | IREAD_LOCK(ipimap, RDWRLOCK_IMAP); |
2637 | |
2638 | /* read the iag */ |
2639 | if ((rc = diIAGRead(imap, iagno, &mp))) { |
2640 | IREAD_UNLOCK(ipimap); |
2641 | rc = -EIO; |
2642 | goto out; |
2643 | } |
2644 | iagp = (struct iag *) mp->data; |
2645 | |
2646 | /* remove the iag from the iag free list */ |
2647 | imap->im_freeiag = le32_to_cpu(iagp->iagfree); |
2648 | iagp->iagfree = cpu_to_le32(-1); |
2649 | |
2650 | /* set the return iag number and buffer pointer */ |
2651 | *iagnop = iagno; |
2652 | *mpp = mp; |
2653 | |
2654 | out: |
2655 | /* release the iag free lock */ |
2656 | IAGFREE_UNLOCK(imap); |
2657 | |
2658 | return (rc); |
2659 | } |
2660 | |
2661 | /* |
2662 | * NAME: diIAGRead() |
2663 | * |
2664 | * FUNCTION: get the buffer for the specified iag within a fileset |
2665 | * or aggregate inode map. |
2666 | * |
2667 | * PARAMETERS: |
2668 | * imap - pointer to inode map control structure. |
2669 | * iagno - iag number. |
2670 | * bpp - point to buffer pointer to be filled in on successful |
2671 | * exit. |
2672 | * |
2673 | * SERIALIZATION: |
2674 | * must have read lock on imap inode |
2675 | * (When called by diExtendFS, the filesystem is quiesced, therefore |
2676 | * the read lock is unnecessary.) |
2677 | * |
2678 | * RETURN VALUES: |
2679 | * 0 - success. |
2680 | * -EIO - i/o error. |
2681 | */ |
2682 | static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp) |
2683 | { |
2684 | struct inode *ipimap = imap->im_ipimap; |
2685 | s64 blkno; |
2686 | |
2687 | /* compute the logical block number of the iag. */ |
2688 | blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage); |
2689 | |
2690 | /* read the iag. */ |
2691 | *mpp = read_metapage(ipimap, blkno, PSIZE, 0); |
2692 | if (*mpp == NULL) { |
2693 | return -EIO; |
2694 | } |
2695 | |
2696 | return (0); |
2697 | } |
2698 | |
2699 | /* |
2700 | * NAME: diFindFree() |
2701 | * |
2702 | * FUNCTION: find the first free bit in a word starting at |
2703 | * the specified bit position. |
2704 | * |
2705 | * PARAMETERS: |
2706 | * word - word to be examined. |
2707 | * start - starting bit position. |
2708 | * |
2709 | * RETURN VALUES: |
2710 | * bit position of first free bit in the word or 32 if |
2711 | * no free bits were found. |
2712 | */ |
2713 | static int diFindFree(u32 word, int start) |
2714 | { |
2715 | int bitno; |
2716 | assert(start < 32); |
2717 | /* scan the word for the first free bit. */ |
2718 | for (word <<= start, bitno = start; bitno < 32; |
2719 | bitno++, word <<= 1) { |
2720 | if ((word & HIGHORDER) == 0) |
2721 | break; |
2722 | } |
2723 | return (bitno); |
2724 | } |
2725 | |
2726 | /* |
2727 | * NAME: diUpdatePMap() |
2728 | * |
2729 | * FUNCTION: Update the persistent map in an IAG for the allocation or |
2730 | * freeing of the specified inode. |
2731 | * |
2732 | * PRE CONDITIONS: Working map has already been updated for allocate. |
2733 | * |
2734 | * PARAMETERS: |
2735 | * ipimap - Incore inode map inode |
2736 | * inum - Number of inode to mark in permanent map |
2737 | * is_free - If 'true' indicates inode should be marked freed, otherwise |
2738 | * indicates inode should be marked allocated. |
2739 | * |
2740 | * RETURN VALUES: |
2741 | * 0 for success |
2742 | */ |
2743 | int |
2744 | diUpdatePMap(struct inode *ipimap, |
2745 | unsigned long inum, bool is_free, struct tblock * tblk) |
2746 | { |
2747 | int rc; |
2748 | struct iag *iagp; |
2749 | struct metapage *mp; |
2750 | int iagno, ino, extno, bitno; |
2751 | struct inomap *imap; |
2752 | u32 mask; |
2753 | struct jfs_log *log; |
2754 | int lsn, difft, diffp; |
2755 | unsigned long flags; |
2756 | |
2757 | imap = JFS_IP(ipimap)->i_imap; |
2758 | /* get the iag number containing the inode */ |
2759 | iagno = INOTOIAG(inum); |
2760 | /* make sure that the iag is contained within the map */ |
2761 | if (iagno >= imap->im_nextiag) { |
2762 | jfs_error(ipimap->i_sb, |
2763 | "diUpdatePMap: the iag is outside the map"); |
2764 | return -EIO; |
2765 | } |
2766 | /* read the iag */ |
2767 | IREAD_LOCK(ipimap, RDWRLOCK_IMAP); |
2768 | rc = diIAGRead(imap, iagno, &mp); |
2769 | IREAD_UNLOCK(ipimap); |
2770 | if (rc) |
2771 | return (rc); |
2772 | metapage_wait_for_io(mp); |
2773 | iagp = (struct iag *) mp->data; |
2774 | /* get the inode number and extent number of the inode within |
2775 | * the iag and the inode number within the extent. |
2776 | */ |
2777 | ino = inum & (INOSPERIAG - 1); |
2778 | extno = ino >> L2INOSPEREXT; |
2779 | bitno = ino & (INOSPEREXT - 1); |
2780 | mask = HIGHORDER >> bitno; |
2781 | /* |
2782 | * mark the inode free in persistent map: |
2783 | */ |
2784 | if (is_free) { |
2785 | /* The inode should have been allocated both in working |
2786 | * map and in persistent map; |
2787 | * the inode will be freed from working map at the release |
2788 | * of last reference release; |
2789 | */ |
2790 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { |
2791 | jfs_error(ipimap->i_sb, |
2792 | "diUpdatePMap: inode %ld not marked as " |
2793 | "allocated in wmap!", inum); |
2794 | } |
2795 | if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) { |
2796 | jfs_error(ipimap->i_sb, |
2797 | "diUpdatePMap: inode %ld not marked as " |
2798 | "allocated in pmap!", inum); |
2799 | } |
2800 | /* update the bitmap for the extent of the freed inode */ |
2801 | iagp->pmap[extno] &= cpu_to_le32(~mask); |
2802 | } |
2803 | /* |
2804 | * mark the inode allocated in persistent map: |
2805 | */ |
2806 | else { |
2807 | /* The inode should be already allocated in the working map |
2808 | * and should be free in persistent map; |
2809 | */ |
2810 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { |
2811 | release_metapage(mp); |
2812 | jfs_error(ipimap->i_sb, |
2813 | "diUpdatePMap: the inode is not allocated in " |
2814 | "the working map"); |
2815 | return -EIO; |
2816 | } |
2817 | if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) { |
2818 | release_metapage(mp); |
2819 | jfs_error(ipimap->i_sb, |
2820 | "diUpdatePMap: the inode is not free in the " |
2821 | "persistent map"); |
2822 | return -EIO; |
2823 | } |
2824 | /* update the bitmap for the extent of the allocated inode */ |
2825 | iagp->pmap[extno] |= cpu_to_le32(mask); |
2826 | } |
2827 | /* |
2828 | * update iag lsn |
2829 | */ |
2830 | lsn = tblk->lsn; |
2831 | log = JFS_SBI(tblk->sb)->log; |
2832 | LOGSYNC_LOCK(log, flags); |
2833 | if (mp->lsn != 0) { |
2834 | /* inherit older/smaller lsn */ |
2835 | logdiff(difft, lsn, log); |
2836 | logdiff(diffp, mp->lsn, log); |
2837 | if (difft < diffp) { |
2838 | mp->lsn = lsn; |
2839 | /* move mp after tblock in logsync list */ |
2840 | list_move(&mp->synclist, &tblk->synclist); |
2841 | } |
2842 | /* inherit younger/larger clsn */ |
2843 | assert(mp->clsn); |
2844 | logdiff(difft, tblk->clsn, log); |
2845 | logdiff(diffp, mp->clsn, log); |
2846 | if (difft > diffp) |
2847 | mp->clsn = tblk->clsn; |
2848 | } else { |
2849 | mp->log = log; |
2850 | mp->lsn = lsn; |
2851 | /* insert mp after tblock in logsync list */ |
2852 | log->count++; |
2853 | list_add(&mp->synclist, &tblk->synclist); |
2854 | mp->clsn = tblk->clsn; |
2855 | } |
2856 | LOGSYNC_UNLOCK(log, flags); |
2857 | write_metapage(mp); |
2858 | return (0); |
2859 | } |
2860 | |
2861 | /* |
2862 | * diExtendFS() |
2863 | * |
2864 | * function: update imap for extendfs(); |
2865 | * |
2866 | * note: AG size has been increased s.t. each k old contiguous AGs are |
2867 | * coalesced into a new AG; |
2868 | */ |
2869 | int diExtendFS(struct inode *ipimap, struct inode *ipbmap) |
2870 | { |
2871 | int rc, rcx = 0; |
2872 | struct inomap *imap = JFS_IP(ipimap)->i_imap; |
2873 | struct iag *iagp = NULL, *hiagp = NULL; |
2874 | struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap; |
2875 | struct metapage *bp, *hbp; |
2876 | int i, n, head; |
2877 | int numinos, xnuminos = 0, xnumfree = 0; |
2878 | s64 agstart; |
2879 | |
2880 | jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d", |
2881 | imap->im_nextiag, atomic_read(&imap->im_numinos), |
2882 | atomic_read(&imap->im_numfree)); |
2883 | |
2884 | /* |
2885 | * reconstruct imap |
2886 | * |
2887 | * coalesce contiguous k (newAGSize/oldAGSize) AGs; |
2888 | * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn; |
2889 | * note: new AG size = old AG size * (2**x). |
2890 | */ |
2891 | |
2892 | /* init per AG control information im_agctl[] */ |
2893 | for (i = 0; i < MAXAG; i++) { |
2894 | imap->im_agctl[i].inofree = -1; |
2895 | imap->im_agctl[i].extfree = -1; |
2896 | imap->im_agctl[i].numinos = 0; /* number of backed inodes */ |
2897 | imap->im_agctl[i].numfree = 0; /* number of free backed inodes */ |
2898 | } |
2899 | |
2900 | /* |
2901 | * process each iag page of the map. |
2902 | * |
2903 | * rebuild AG Free Inode List, AG Free Inode Extent List; |
2904 | */ |
2905 | for (i = 0; i < imap->im_nextiag; i++) { |
2906 | if ((rc = diIAGRead(imap, i, &bp))) { |
2907 | rcx = rc; |
2908 | continue; |
2909 | } |
2910 | iagp = (struct iag *) bp->data; |
2911 | if (le32_to_cpu(iagp->iagnum) != i) { |
2912 | release_metapage(bp); |
2913 | jfs_error(ipimap->i_sb, |
2914 | "diExtendFs: unexpected value of iagnum"); |
2915 | return -EIO; |
2916 | } |
2917 | |
2918 | /* leave free iag in the free iag list */ |
2919 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { |
2920 | release_metapage(bp); |
2921 | continue; |
2922 | } |
2923 | |
2924 | /* agstart that computes to the same ag is treated as same; */ |
2925 | agstart = le64_to_cpu(iagp->agstart); |
2926 | /* iagp->agstart = agstart & ~(mp->db_agsize - 1); */ |
2927 | n = agstart >> mp->db_agl2size; |
2928 | |
2929 | /* compute backed inodes */ |
2930 | numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts)) |
2931 | << L2INOSPEREXT; |
2932 | if (numinos > 0) { |
2933 | /* merge AG backed inodes */ |
2934 | imap->im_agctl[n].numinos += numinos; |
2935 | xnuminos += numinos; |
2936 | } |
2937 | |
2938 | /* if any backed free inodes, insert at AG free inode list */ |
2939 | if ((int) le32_to_cpu(iagp->nfreeinos) > 0) { |
2940 | if ((head = imap->im_agctl[n].inofree) == -1) { |
2941 | iagp->inofreefwd = cpu_to_le32(-1); |
2942 | iagp->inofreeback = cpu_to_le32(-1); |
2943 | } else { |
2944 | if ((rc = diIAGRead(imap, head, &hbp))) { |
2945 | rcx = rc; |
2946 | goto nextiag; |
2947 | } |
2948 | hiagp = (struct iag *) hbp->data; |
2949 | hiagp->inofreeback = iagp->iagnum; |
2950 | iagp->inofreefwd = cpu_to_le32(head); |
2951 | iagp->inofreeback = cpu_to_le32(-1); |
2952 | write_metapage(hbp); |
2953 | } |
2954 | |
2955 | imap->im_agctl[n].inofree = |
2956 | le32_to_cpu(iagp->iagnum); |
2957 | |
2958 | /* merge AG backed free inodes */ |
2959 | imap->im_agctl[n].numfree += |
2960 | le32_to_cpu(iagp->nfreeinos); |
2961 | xnumfree += le32_to_cpu(iagp->nfreeinos); |
2962 | } |
2963 | |
2964 | /* if any free extents, insert at AG free extent list */ |
2965 | if (le32_to_cpu(iagp->nfreeexts) > 0) { |
2966 | if ((head = imap->im_agctl[n].extfree) == -1) { |
2967 | iagp->extfreefwd = cpu_to_le32(-1); |
2968 | iagp->extfreeback = cpu_to_le32(-1); |
2969 | } else { |
2970 | if ((rc = diIAGRead(imap, head, &hbp))) { |
2971 | rcx = rc; |
2972 | goto nextiag; |
2973 | } |
2974 | hiagp = (struct iag *) hbp->data; |
2975 | hiagp->extfreeback = iagp->iagnum; |
2976 | iagp->extfreefwd = cpu_to_le32(head); |
2977 | iagp->extfreeback = cpu_to_le32(-1); |
2978 | write_metapage(hbp); |
2979 | } |
2980 | |
2981 | imap->im_agctl[n].extfree = |
2982 | le32_to_cpu(iagp->iagnum); |
2983 | } |
2984 | |
2985 | nextiag: |
2986 | write_metapage(bp); |
2987 | } |
2988 | |
2989 | if (xnuminos != atomic_read(&imap->im_numinos) || |
2990 | xnumfree != atomic_read(&imap->im_numfree)) { |
2991 | jfs_error(ipimap->i_sb, |
2992 | "diExtendFs: numinos or numfree incorrect"); |
2993 | return -EIO; |
2994 | } |
2995 | |
2996 | return rcx; |
2997 | } |
2998 | |
2999 | |
3000 | /* |
3001 | * duplicateIXtree() |
3002 | * |
3003 | * serialization: IWRITE_LOCK held on entry/exit |
3004 | * |
3005 | * note: shadow page with regular inode (rel.2); |
3006 | */ |
3007 | static void duplicateIXtree(struct super_block *sb, s64 blkno, |
3008 | int xlen, s64 *xaddr) |
3009 | { |
3010 | struct jfs_superblock *j_sb; |
3011 | struct buffer_head *bh; |
3012 | struct inode *ip; |
3013 | tid_t tid; |
3014 | |
3015 | /* if AIT2 ipmap2 is bad, do not try to update it */ |
3016 | if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */ |
3017 | return; |
3018 | ip = diReadSpecial(sb, FILESYSTEM_I, 1); |
3019 | if (ip == NULL) { |
3020 | JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; |
3021 | if (readSuper(sb, &bh)) |
3022 | return; |
3023 | j_sb = (struct jfs_superblock *)bh->b_data; |
3024 | j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); |
3025 | |
3026 | mark_buffer_dirty(bh); |
3027 | sync_dirty_buffer(bh); |
3028 | brelse(bh); |
3029 | return; |
3030 | } |
3031 | |
3032 | /* start transaction */ |
3033 | tid = txBegin(sb, COMMIT_FORCE); |
3034 | /* update the inode map addressing structure to point to it */ |
3035 | if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) { |
3036 | JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; |
3037 | txAbort(tid, 1); |
3038 | goto cleanup; |
3039 | |
3040 | } |
3041 | /* update the inode map's inode to reflect the extension */ |
3042 | ip->i_size += PSIZE; |
3043 | inode_add_bytes(ip, PSIZE); |
3044 | txCommit(tid, 1, &ip, COMMIT_FORCE); |
3045 | cleanup: |
3046 | txEnd(tid); |
3047 | diFreeSpecial(ip); |
3048 | } |
3049 | |
3050 | /* |
3051 | * NAME: copy_from_dinode() |
3052 | * |
3053 | * FUNCTION: Copies inode info from disk inode to in-memory inode |
3054 | * |
3055 | * RETURN VALUES: |
3056 | * 0 - success |
3057 | * -ENOMEM - insufficient memory |
3058 | */ |
3059 | static int copy_from_dinode(struct dinode * dip, struct inode *ip) |
3060 | { |
3061 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); |
3062 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); |
3063 | |
3064 | jfs_ip->fileset = le32_to_cpu(dip->di_fileset); |
3065 | jfs_ip->mode2 = le32_to_cpu(dip->di_mode); |
3066 | jfs_set_inode_flags(ip); |
3067 | |
3068 | ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff; |
3069 | if (sbi->umask != -1) { |
3070 | ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask); |
3071 | /* For directories, add x permission if r is allowed by umask */ |
3072 | if (S_ISDIR(ip->i_mode)) { |
3073 | if (ip->i_mode & 0400) |
3074 | ip->i_mode |= 0100; |
3075 | if (ip->i_mode & 0040) |
3076 | ip->i_mode |= 0010; |
3077 | if (ip->i_mode & 0004) |
3078 | ip->i_mode |= 0001; |
3079 | } |
3080 | } |
3081 | ip->i_nlink = le32_to_cpu(dip->di_nlink); |
3082 | |
3083 | jfs_ip->saved_uid = le32_to_cpu(dip->di_uid); |
3084 | if (sbi->uid == -1) |
3085 | ip->i_uid = jfs_ip->saved_uid; |
3086 | else { |
3087 | ip->i_uid = sbi->uid; |
3088 | } |
3089 | |
3090 | jfs_ip->saved_gid = le32_to_cpu(dip->di_gid); |
3091 | if (sbi->gid == -1) |
3092 | ip->i_gid = jfs_ip->saved_gid; |
3093 | else { |
3094 | ip->i_gid = sbi->gid; |
3095 | } |
3096 | |
3097 | ip->i_size = le64_to_cpu(dip->di_size); |
3098 | ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec); |
3099 | ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec); |
3100 | ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec); |
3101 | ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec); |
3102 | ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec); |
3103 | ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec); |
3104 | ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks)); |
3105 | ip->i_generation = le32_to_cpu(dip->di_gen); |
3106 | |
3107 | jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */ |
3108 | jfs_ip->acl = dip->di_acl; /* as are dxd's */ |
3109 | jfs_ip->ea = dip->di_ea; |
3110 | jfs_ip->next_index = le32_to_cpu(dip->di_next_index); |
3111 | jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec); |
3112 | jfs_ip->acltype = le32_to_cpu(dip->di_acltype); |
3113 | |
3114 | if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) { |
3115 | jfs_ip->dev = le32_to_cpu(dip->di_rdev); |
3116 | ip->i_rdev = new_decode_dev(jfs_ip->dev); |
3117 | } |
3118 | |
3119 | if (S_ISDIR(ip->i_mode)) { |
3120 | memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384); |
3121 | } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) { |
3122 | memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288); |
3123 | } else |
3124 | memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128); |
3125 | |
3126 | /* Zero the in-memory-only stuff */ |
3127 | jfs_ip->cflag = 0; |
3128 | jfs_ip->btindex = 0; |
3129 | jfs_ip->btorder = 0; |
3130 | jfs_ip->bxflag = 0; |
3131 | jfs_ip->blid = 0; |
3132 | jfs_ip->atlhead = 0; |
3133 | jfs_ip->atltail = 0; |
3134 | jfs_ip->xtlid = 0; |
3135 | return (0); |
3136 | } |
3137 | |
3138 | /* |
3139 | * NAME: copy_to_dinode() |
3140 | * |
3141 | * FUNCTION: Copies inode info from in-memory inode to disk inode |
3142 | */ |
3143 | static void copy_to_dinode(struct dinode * dip, struct inode *ip) |
3144 | { |
3145 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); |
3146 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); |
3147 | |
3148 | dip->di_fileset = cpu_to_le32(jfs_ip->fileset); |
3149 | dip->di_inostamp = cpu_to_le32(sbi->inostamp); |
3150 | dip->di_number = cpu_to_le32(ip->i_ino); |
3151 | dip->di_gen = cpu_to_le32(ip->i_generation); |
3152 | dip->di_size = cpu_to_le64(ip->i_size); |
3153 | dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks)); |
3154 | dip->di_nlink = cpu_to_le32(ip->i_nlink); |
3155 | if (sbi->uid == -1) |
3156 | dip->di_uid = cpu_to_le32(ip->i_uid); |
3157 | else |
3158 | dip->di_uid = cpu_to_le32(jfs_ip->saved_uid); |
3159 | if (sbi->gid == -1) |
3160 | dip->di_gid = cpu_to_le32(ip->i_gid); |
3161 | else |
3162 | dip->di_gid = cpu_to_le32(jfs_ip->saved_gid); |
3163 | jfs_get_inode_flags(jfs_ip); |
3164 | /* |
3165 | * mode2 is only needed for storing the higher order bits. |
3166 | * Trust i_mode for the lower order ones |
3167 | */ |
3168 | if (sbi->umask == -1) |
3169 | dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) | |
3170 | ip->i_mode); |
3171 | else /* Leave the original permissions alone */ |
3172 | dip->di_mode = cpu_to_le32(jfs_ip->mode2); |
3173 | |
3174 | dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec); |
3175 | dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec); |
3176 | dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec); |
3177 | dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec); |
3178 | dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec); |
3179 | dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec); |
3180 | dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */ |
3181 | dip->di_acl = jfs_ip->acl; /* as are dxd's */ |
3182 | dip->di_ea = jfs_ip->ea; |
3183 | dip->di_next_index = cpu_to_le32(jfs_ip->next_index); |
3184 | dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime); |
3185 | dip->di_otime.tv_nsec = 0; |
3186 | dip->di_acltype = cpu_to_le32(jfs_ip->acltype); |
3187 | if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) |
3188 | dip->di_rdev = cpu_to_le32(jfs_ip->dev); |
3189 | } |
3190 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9