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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 | ||
49 | #include "jfs_incore.h" | |
50 | #include "jfs_filsys.h" | |
51 | #include "jfs_dinode.h" | |
52 | #include "jfs_dmap.h" | |
53 | #include "jfs_imap.h" | |
54 | #include "jfs_metapage.h" | |
55 | #include "jfs_superblock.h" | |
56 | #include "jfs_debug.h" | |
57 | ||
58 | /* | |
59 | * imap locks | |
60 | */ | |
61 | /* iag free list lock */ | |
62 | #define IAGFREE_LOCK_INIT(imap) init_MUTEX(&imap->im_freelock) | |
63 | #define IAGFREE_LOCK(imap) down(&imap->im_freelock) | |
64 | #define IAGFREE_UNLOCK(imap) up(&imap->im_freelock) | |
65 | ||
66 | /* per ag iag list locks */ | |
67 | #define AG_LOCK_INIT(imap,index) init_MUTEX(&(imap->im_aglock[index])) | |
68 | #define AG_LOCK(imap,agno) down(&imap->im_aglock[agno]) | |
69 | #define AG_UNLOCK(imap,agno) up(&imap->im_aglock[agno]) | |
70 | ||
71 | /* | |
72 | * external references | |
73 | */ | |
74 | extern struct address_space_operations jfs_aops; | |
75 | ||
76 | /* | |
77 | * forward references | |
78 | */ | |
79 | static int diAllocAG(struct inomap *, int, boolean_t, struct inode *); | |
80 | static int diAllocAny(struct inomap *, int, boolean_t, struct inode *); | |
81 | static int diAllocBit(struct inomap *, struct iag *, int); | |
82 | static int diAllocExt(struct inomap *, int, struct inode *); | |
83 | static int diAllocIno(struct inomap *, int, struct inode *); | |
84 | static int diFindFree(u32, int); | |
85 | static int diNewExt(struct inomap *, struct iag *, int); | |
86 | static int diNewIAG(struct inomap *, int *, int, struct metapage **); | |
87 | static void duplicateIXtree(struct super_block *, s64, int, s64 *); | |
88 | ||
89 | static int diIAGRead(struct inomap * imap, int, struct metapage **); | |
90 | static int copy_from_dinode(struct dinode *, struct inode *); | |
91 | static void copy_to_dinode(struct dinode *, struct inode *); | |
92 | ||
93 | /* | |
94 | * debug code for double-checking inode map | |
95 | */ | |
96 | /* #define _JFS_DEBUG_IMAP 1 */ | |
97 | ||
98 | #ifdef _JFS_DEBUG_IMAP | |
99 | #define DBG_DIINIT(imap) DBGdiInit(imap) | |
100 | #define DBG_DIALLOC(imap, ino) DBGdiAlloc(imap, ino) | |
101 | #define DBG_DIFREE(imap, ino) DBGdiFree(imap, ino) | |
102 | ||
103 | static void *DBGdiInit(struct inomap * imap); | |
104 | static void DBGdiAlloc(struct inomap * imap, ino_t ino); | |
105 | static void DBGdiFree(struct inomap * imap, ino_t ino); | |
106 | #else | |
107 | #define DBG_DIINIT(imap) | |
108 | #define DBG_DIALLOC(imap, ino) | |
109 | #define DBG_DIFREE(imap, ino) | |
110 | #endif /* _JFS_DEBUG_IMAP */ | |
111 | ||
112 | /* | |
113 | * NAME: diMount() | |
114 | * | |
115 | * FUNCTION: initialize the incore inode map control structures for | |
116 | * a fileset or aggregate init time. | |
117 | * | |
118 | * the inode map's control structure (dinomap) is | |
119 | * brought in from disk and placed in virtual memory. | |
120 | * | |
121 | * PARAMETERS: | |
122 | * ipimap - pointer to inode map inode for the aggregate or fileset. | |
123 | * | |
124 | * RETURN VALUES: | |
125 | * 0 - success | |
126 | * -ENOMEM - insufficient free virtual memory. | |
127 | * -EIO - i/o error. | |
128 | */ | |
129 | int diMount(struct inode *ipimap) | |
130 | { | |
131 | struct inomap *imap; | |
132 | struct metapage *mp; | |
133 | int index; | |
134 | struct dinomap_disk *dinom_le; | |
135 | ||
136 | /* | |
137 | * allocate/initialize the in-memory inode map control structure | |
138 | */ | |
139 | /* allocate the in-memory inode map control structure. */ | |
140 | imap = (struct inomap *) kmalloc(sizeof(struct inomap), GFP_KERNEL); | |
141 | if (imap == NULL) { | |
142 | jfs_err("diMount: kmalloc returned NULL!"); | |
143 | return -ENOMEM; | |
144 | } | |
145 | ||
146 | /* read the on-disk inode map control structure. */ | |
147 | ||
148 | mp = read_metapage(ipimap, | |
149 | IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, | |
150 | PSIZE, 0); | |
151 | if (mp == NULL) { | |
152 | kfree(imap); | |
153 | return -EIO; | |
154 | } | |
155 | ||
156 | /* copy the on-disk version to the in-memory version. */ | |
157 | dinom_le = (struct dinomap_disk *) mp->data; | |
158 | imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag); | |
159 | imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag); | |
160 | atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos)); | |
161 | atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree)); | |
162 | imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext); | |
163 | imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext); | |
164 | for (index = 0; index < MAXAG; index++) { | |
165 | imap->im_agctl[index].inofree = | |
166 | le32_to_cpu(dinom_le->in_agctl[index].inofree); | |
167 | imap->im_agctl[index].extfree = | |
168 | le32_to_cpu(dinom_le->in_agctl[index].extfree); | |
169 | imap->im_agctl[index].numinos = | |
170 | le32_to_cpu(dinom_le->in_agctl[index].numinos); | |
171 | imap->im_agctl[index].numfree = | |
172 | le32_to_cpu(dinom_le->in_agctl[index].numfree); | |
173 | } | |
174 | ||
175 | /* release the buffer. */ | |
176 | release_metapage(mp); | |
177 | ||
178 | /* | |
179 | * allocate/initialize inode allocation map locks | |
180 | */ | |
181 | /* allocate and init iag free list lock */ | |
182 | IAGFREE_LOCK_INIT(imap); | |
183 | ||
184 | /* allocate and init ag list locks */ | |
185 | for (index = 0; index < MAXAG; index++) { | |
186 | AG_LOCK_INIT(imap, index); | |
187 | } | |
188 | ||
189 | /* bind the inode map inode and inode map control structure | |
190 | * to each other. | |
191 | */ | |
192 | imap->im_ipimap = ipimap; | |
193 | JFS_IP(ipimap)->i_imap = imap; | |
194 | ||
195 | // DBG_DIINIT(imap); | |
196 | ||
197 | return (0); | |
198 | } | |
199 | ||
200 | ||
201 | /* | |
202 | * NAME: diUnmount() | |
203 | * | |
204 | * FUNCTION: write to disk the incore inode map control structures for | |
205 | * a fileset or aggregate at unmount time. | |
206 | * | |
207 | * PARAMETERS: | |
208 | * ipimap - pointer to inode map inode for the aggregate or fileset. | |
209 | * | |
210 | * RETURN VALUES: | |
211 | * 0 - success | |
212 | * -ENOMEM - insufficient free virtual memory. | |
213 | * -EIO - i/o error. | |
214 | */ | |
215 | int diUnmount(struct inode *ipimap, int mounterror) | |
216 | { | |
217 | struct inomap *imap = JFS_IP(ipimap)->i_imap; | |
218 | ||
219 | /* | |
220 | * update the on-disk inode map control structure | |
221 | */ | |
222 | ||
223 | if (!(mounterror || isReadOnly(ipimap))) | |
224 | diSync(ipimap); | |
225 | ||
226 | /* | |
227 | * Invalidate the page cache buffers | |
228 | */ | |
229 | truncate_inode_pages(ipimap->i_mapping, 0); | |
230 | ||
231 | /* | |
232 | * free in-memory control structure | |
233 | */ | |
234 | kfree(imap); | |
235 | ||
236 | return (0); | |
237 | } | |
238 | ||
239 | ||
240 | /* | |
241 | * diSync() | |
242 | */ | |
243 | int diSync(struct inode *ipimap) | |
244 | { | |
245 | struct dinomap_disk *dinom_le; | |
246 | struct inomap *imp = JFS_IP(ipimap)->i_imap; | |
247 | struct metapage *mp; | |
248 | int index; | |
249 | ||
250 | /* | |
251 | * write imap global conrol page | |
252 | */ | |
253 | /* read the on-disk inode map control structure */ | |
254 | mp = get_metapage(ipimap, | |
255 | IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, | |
256 | PSIZE, 0); | |
257 | if (mp == NULL) { | |
258 | jfs_err("diSync: get_metapage failed!"); | |
259 | return -EIO; | |
260 | } | |
261 | ||
262 | /* copy the in-memory version to the on-disk version */ | |
263 | dinom_le = (struct dinomap_disk *) mp->data; | |
264 | dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag); | |
265 | dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag); | |
266 | dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos)); | |
267 | dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree)); | |
268 | dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext); | |
269 | dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext); | |
270 | for (index = 0; index < MAXAG; index++) { | |
271 | dinom_le->in_agctl[index].inofree = | |
272 | cpu_to_le32(imp->im_agctl[index].inofree); | |
273 | dinom_le->in_agctl[index].extfree = | |
274 | cpu_to_le32(imp->im_agctl[index].extfree); | |
275 | dinom_le->in_agctl[index].numinos = | |
276 | cpu_to_le32(imp->im_agctl[index].numinos); | |
277 | dinom_le->in_agctl[index].numfree = | |
278 | cpu_to_le32(imp->im_agctl[index].numfree); | |
279 | } | |
280 | ||
281 | /* write out the control structure */ | |
282 | write_metapage(mp); | |
283 | ||
284 | /* | |
285 | * write out dirty pages of imap | |
286 | */ | |
287 | filemap_fdatawrite(ipimap->i_mapping); | |
288 | filemap_fdatawait(ipimap->i_mapping); | |
289 | ||
290 | diWriteSpecial(ipimap, 0); | |
291 | ||
292 | return (0); | |
293 | } | |
294 | ||
295 | ||
296 | /* | |
297 | * NAME: diRead() | |
298 | * | |
299 | * FUNCTION: initialize an incore inode from disk. | |
300 | * | |
301 | * on entry, the specifed incore inode should itself | |
302 | * specify the disk inode number corresponding to the | |
303 | * incore inode (i.e. i_number should be initialized). | |
304 | * | |
305 | * this routine handles incore inode initialization for | |
306 | * both "special" and "regular" inodes. special inodes | |
307 | * are those required early in the mount process and | |
308 | * require special handling since much of the file system | |
309 | * is not yet initialized. these "special" inodes are | |
310 | * identified by a NULL inode map inode pointer and are | |
311 | * actually initialized by a call to diReadSpecial(). | |
312 | * | |
313 | * for regular inodes, the iag describing the disk inode | |
314 | * is read from disk to determine the inode extent address | |
315 | * for the disk inode. with the inode extent address in | |
316 | * hand, the page of the extent that contains the disk | |
317 | * inode is read and the disk inode is copied to the | |
318 | * incore inode. | |
319 | * | |
320 | * PARAMETERS: | |
321 | * ip - pointer to incore inode to be initialized from disk. | |
322 | * | |
323 | * RETURN VALUES: | |
324 | * 0 - success | |
325 | * -EIO - i/o error. | |
326 | * -ENOMEM - insufficient memory | |
327 | * | |
328 | */ | |
329 | int diRead(struct inode *ip) | |
330 | { | |
331 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
332 | int iagno, ino, extno, rc; | |
333 | struct inode *ipimap; | |
334 | struct dinode *dp; | |
335 | struct iag *iagp; | |
336 | struct metapage *mp; | |
337 | s64 blkno, agstart; | |
338 | struct inomap *imap; | |
339 | int block_offset; | |
340 | int inodes_left; | |
341 | uint pageno; | |
342 | int rel_inode; | |
343 | ||
344 | jfs_info("diRead: ino = %ld", ip->i_ino); | |
345 | ||
346 | ipimap = sbi->ipimap; | |
347 | JFS_IP(ip)->ipimap = ipimap; | |
348 | ||
349 | /* determine the iag number for this inode (number) */ | |
350 | iagno = INOTOIAG(ip->i_ino); | |
351 | ||
352 | /* read the iag */ | |
353 | imap = JFS_IP(ipimap)->i_imap; | |
354 | IREAD_LOCK(ipimap); | |
355 | rc = diIAGRead(imap, iagno, &mp); | |
356 | IREAD_UNLOCK(ipimap); | |
357 | if (rc) { | |
358 | jfs_err("diRead: diIAGRead returned %d", rc); | |
359 | return (rc); | |
360 | } | |
361 | ||
362 | iagp = (struct iag *) mp->data; | |
363 | ||
364 | /* determine inode extent that holds the disk inode */ | |
365 | ino = ip->i_ino & (INOSPERIAG - 1); | |
366 | extno = ino >> L2INOSPEREXT; | |
367 | ||
368 | if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) || | |
369 | (addressPXD(&iagp->inoext[extno]) == 0)) { | |
370 | release_metapage(mp); | |
371 | return -ESTALE; | |
372 | } | |
373 | ||
374 | /* get disk block number of the page within the inode extent | |
375 | * that holds the disk inode. | |
376 | */ | |
377 | blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage); | |
378 | ||
379 | /* get the ag for the iag */ | |
380 | agstart = le64_to_cpu(iagp->agstart); | |
381 | ||
382 | release_metapage(mp); | |
383 | ||
384 | rel_inode = (ino & (INOSPERPAGE - 1)); | |
385 | pageno = blkno >> sbi->l2nbperpage; | |
386 | ||
387 | if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { | |
388 | /* | |
389 | * OS/2 didn't always align inode extents on page boundaries | |
390 | */ | |
391 | inodes_left = | |
392 | (sbi->nbperpage - block_offset) << sbi->l2niperblk; | |
393 | ||
394 | if (rel_inode < inodes_left) | |
395 | rel_inode += block_offset << sbi->l2niperblk; | |
396 | else { | |
397 | pageno += 1; | |
398 | rel_inode -= inodes_left; | |
399 | } | |
400 | } | |
401 | ||
402 | /* read the page of disk inode */ | |
403 | mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); | |
404 | if (mp == 0) { | |
405 | jfs_err("diRead: read_metapage failed"); | |
406 | return -EIO; | |
407 | } | |
408 | ||
409 | /* locate the the disk inode requested */ | |
410 | dp = (struct dinode *) mp->data; | |
411 | dp += rel_inode; | |
412 | ||
413 | if (ip->i_ino != le32_to_cpu(dp->di_number)) { | |
414 | jfs_error(ip->i_sb, "diRead: i_ino != di_number"); | |
415 | rc = -EIO; | |
416 | } else if (le32_to_cpu(dp->di_nlink) == 0) | |
417 | rc = -ESTALE; | |
418 | else | |
419 | /* copy the disk inode to the in-memory inode */ | |
420 | rc = copy_from_dinode(dp, ip); | |
421 | ||
422 | release_metapage(mp); | |
423 | ||
424 | /* set the ag for the inode */ | |
425 | JFS_IP(ip)->agno = BLKTOAG(agstart, sbi); | |
426 | JFS_IP(ip)->active_ag = -1; | |
427 | ||
428 | return (rc); | |
429 | } | |
430 | ||
431 | ||
432 | /* | |
433 | * NAME: diReadSpecial() | |
434 | * | |
435 | * FUNCTION: initialize a 'special' inode from disk. | |
436 | * | |
437 | * this routines handles aggregate level inodes. The | |
438 | * inode cache cannot differentiate between the | |
439 | * aggregate inodes and the filesystem inodes, so we | |
440 | * handle these here. We don't actually use the aggregate | |
441 | * inode map, since these inodes are at a fixed location | |
442 | * and in some cases the aggregate inode map isn't initialized | |
443 | * yet. | |
444 | * | |
445 | * PARAMETERS: | |
446 | * sb - filesystem superblock | |
447 | * inum - aggregate inode number | |
448 | * secondary - 1 if secondary aggregate inode table | |
449 | * | |
450 | * RETURN VALUES: | |
451 | * new inode - success | |
452 | * NULL - i/o error. | |
453 | */ | |
454 | struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary) | |
455 | { | |
456 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
457 | uint address; | |
458 | struct dinode *dp; | |
459 | struct inode *ip; | |
460 | struct metapage *mp; | |
461 | ||
462 | ip = new_inode(sb); | |
463 | if (ip == NULL) { | |
464 | jfs_err("diReadSpecial: new_inode returned NULL!"); | |
465 | return ip; | |
466 | } | |
467 | ||
468 | if (secondary) { | |
469 | address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; | |
470 | JFS_IP(ip)->ipimap = sbi->ipaimap2; | |
471 | } else { | |
472 | address = AITBL_OFF >> L2PSIZE; | |
473 | JFS_IP(ip)->ipimap = sbi->ipaimap; | |
474 | } | |
475 | ||
476 | ASSERT(inum < INOSPEREXT); | |
477 | ||
478 | ip->i_ino = inum; | |
479 | ||
480 | address += inum >> 3; /* 8 inodes per 4K page */ | |
481 | ||
482 | /* read the page of fixed disk inode (AIT) in raw mode */ | |
483 | mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); | |
484 | if (mp == NULL) { | |
485 | ip->i_nlink = 1; /* Don't want iput() deleting it */ | |
486 | iput(ip); | |
487 | return (NULL); | |
488 | } | |
489 | ||
490 | /* get the pointer to the disk inode of interest */ | |
491 | dp = (struct dinode *) (mp->data); | |
492 | dp += inum % 8; /* 8 inodes per 4K page */ | |
493 | ||
494 | /* copy on-disk inode to in-memory inode */ | |
495 | if ((copy_from_dinode(dp, ip)) != 0) { | |
496 | /* handle bad return by returning NULL for ip */ | |
497 | ip->i_nlink = 1; /* Don't want iput() deleting it */ | |
498 | iput(ip); | |
499 | /* release the page */ | |
500 | release_metapage(mp); | |
501 | return (NULL); | |
502 | ||
503 | } | |
504 | ||
7fab479b | 505 | ip->i_mapping->a_ops = &jfs_metapage_aops; |
1da177e4 LT |
506 | mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS); |
507 | ||
508 | /* Allocations to metadata inodes should not affect quotas */ | |
509 | ip->i_flags |= S_NOQUOTA; | |
510 | ||
511 | if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) { | |
512 | sbi->gengen = le32_to_cpu(dp->di_gengen); | |
513 | sbi->inostamp = le32_to_cpu(dp->di_inostamp); | |
514 | } | |
515 | ||
516 | /* release the page */ | |
517 | release_metapage(mp); | |
518 | ||
519 | return (ip); | |
520 | } | |
521 | ||
522 | /* | |
523 | * NAME: diWriteSpecial() | |
524 | * | |
525 | * FUNCTION: Write the special inode to disk | |
526 | * | |
527 | * PARAMETERS: | |
528 | * ip - special inode | |
529 | * secondary - 1 if secondary aggregate inode table | |
530 | * | |
531 | * RETURN VALUES: none | |
532 | */ | |
533 | ||
534 | void diWriteSpecial(struct inode *ip, int secondary) | |
535 | { | |
536 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
537 | uint address; | |
538 | struct dinode *dp; | |
539 | ino_t inum = ip->i_ino; | |
540 | struct metapage *mp; | |
541 | ||
542 | ip->i_state &= ~I_DIRTY; | |
543 | ||
544 | if (secondary) | |
545 | address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; | |
546 | else | |
547 | address = AITBL_OFF >> L2PSIZE; | |
548 | ||
549 | ASSERT(inum < INOSPEREXT); | |
550 | ||
551 | address += inum >> 3; /* 8 inodes per 4K page */ | |
552 | ||
553 | /* read the page of fixed disk inode (AIT) in raw mode */ | |
554 | mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); | |
555 | if (mp == NULL) { | |
556 | jfs_err("diWriteSpecial: failed to read aggregate inode " | |
557 | "extent!"); | |
558 | return; | |
559 | } | |
560 | ||
561 | /* get the pointer to the disk inode of interest */ | |
562 | dp = (struct dinode *) (mp->data); | |
563 | dp += inum % 8; /* 8 inodes per 4K page */ | |
564 | ||
565 | /* copy on-disk inode to in-memory inode */ | |
566 | copy_to_dinode(dp, ip); | |
567 | memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288); | |
568 | ||
569 | if (inum == FILESYSTEM_I) | |
570 | dp->di_gengen = cpu_to_le32(sbi->gengen); | |
571 | ||
572 | /* write the page */ | |
573 | write_metapage(mp); | |
574 | } | |
575 | ||
576 | /* | |
577 | * NAME: diFreeSpecial() | |
578 | * | |
579 | * FUNCTION: Free allocated space for special inode | |
580 | */ | |
581 | void diFreeSpecial(struct inode *ip) | |
582 | { | |
583 | if (ip == NULL) { | |
584 | jfs_err("diFreeSpecial called with NULL ip!"); | |
585 | return; | |
586 | } | |
587 | filemap_fdatawrite(ip->i_mapping); | |
588 | filemap_fdatawait(ip->i_mapping); | |
589 | truncate_inode_pages(ip->i_mapping, 0); | |
590 | iput(ip); | |
591 | } | |
592 | ||
593 | ||
594 | ||
595 | /* | |
596 | * NAME: diWrite() | |
597 | * | |
598 | * FUNCTION: write the on-disk inode portion of the in-memory inode | |
599 | * to its corresponding on-disk inode. | |
600 | * | |
601 | * on entry, the specifed incore inode should itself | |
602 | * specify the disk inode number corresponding to the | |
603 | * incore inode (i.e. i_number should be initialized). | |
604 | * | |
605 | * the inode contains the inode extent address for the disk | |
606 | * inode. with the inode extent address in hand, the | |
607 | * page of the extent that contains the disk inode is | |
608 | * read and the disk inode portion of the incore inode | |
609 | * is copied to the disk inode. | |
610 | * | |
611 | * PARAMETERS: | |
612 | * tid - transacation id | |
613 | * ip - pointer to incore inode to be written to the inode extent. | |
614 | * | |
615 | * RETURN VALUES: | |
616 | * 0 - success | |
617 | * -EIO - i/o error. | |
618 | */ | |
619 | int diWrite(tid_t tid, struct inode *ip) | |
620 | { | |
621 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
622 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
623 | int rc = 0; | |
624 | s32 ino; | |
625 | struct dinode *dp; | |
626 | s64 blkno; | |
627 | int block_offset; | |
628 | int inodes_left; | |
629 | struct metapage *mp; | |
630 | uint pageno; | |
631 | int rel_inode; | |
632 | int dioffset; | |
633 | struct inode *ipimap; | |
634 | uint type; | |
635 | lid_t lid; | |
636 | struct tlock *ditlck, *tlck; | |
637 | struct linelock *dilinelock, *ilinelock; | |
638 | struct lv *lv; | |
639 | int n; | |
640 | ||
641 | ipimap = jfs_ip->ipimap; | |
642 | ||
643 | ino = ip->i_ino & (INOSPERIAG - 1); | |
644 | ||
645 | if (!addressPXD(&(jfs_ip->ixpxd)) || | |
646 | (lengthPXD(&(jfs_ip->ixpxd)) != | |
647 | JFS_IP(ipimap)->i_imap->im_nbperiext)) { | |
648 | jfs_error(ip->i_sb, "diWrite: ixpxd invalid"); | |
649 | return -EIO; | |
650 | } | |
651 | ||
652 | /* | |
653 | * read the page of disk inode containing the specified inode: | |
654 | */ | |
655 | /* compute the block address of the page */ | |
656 | blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage); | |
657 | ||
658 | rel_inode = (ino & (INOSPERPAGE - 1)); | |
659 | pageno = blkno >> sbi->l2nbperpage; | |
660 | ||
661 | if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { | |
662 | /* | |
663 | * OS/2 didn't always align inode extents on page boundaries | |
664 | */ | |
665 | inodes_left = | |
666 | (sbi->nbperpage - block_offset) << sbi->l2niperblk; | |
667 | ||
668 | if (rel_inode < inodes_left) | |
669 | rel_inode += block_offset << sbi->l2niperblk; | |
670 | else { | |
671 | pageno += 1; | |
672 | rel_inode -= inodes_left; | |
673 | } | |
674 | } | |
675 | /* read the page of disk inode */ | |
676 | retry: | |
677 | mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); | |
678 | if (mp == 0) | |
679 | return -EIO; | |
680 | ||
681 | /* get the pointer to the disk inode */ | |
682 | dp = (struct dinode *) mp->data; | |
683 | dp += rel_inode; | |
684 | ||
685 | dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE; | |
686 | ||
687 | /* | |
688 | * acquire transaction lock on the on-disk inode; | |
689 | * N.B. tlock is acquired on ipimap not ip; | |
690 | */ | |
691 | if ((ditlck = | |
692 | txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL) | |
693 | goto retry; | |
694 | dilinelock = (struct linelock *) & ditlck->lock; | |
695 | ||
696 | /* | |
697 | * copy btree root from in-memory inode to on-disk inode | |
698 | * | |
699 | * (tlock is taken from inline B+-tree root in in-memory | |
700 | * inode when the B+-tree root is updated, which is pointed | |
701 | * by jfs_ip->blid as well as being on tx tlock list) | |
702 | * | |
703 | * further processing of btree root is based on the copy | |
704 | * in in-memory inode, where txLog() will log from, and, | |
705 | * for xtree root, txUpdateMap() will update map and reset | |
706 | * XAD_NEW bit; | |
707 | */ | |
708 | ||
709 | if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) { | |
710 | /* | |
711 | * This is the special xtree inside the directory for storing | |
712 | * the directory table | |
713 | */ | |
714 | xtpage_t *p, *xp; | |
715 | xad_t *xad; | |
716 | ||
717 | jfs_ip->xtlid = 0; | |
718 | tlck = lid_to_tlock(lid); | |
719 | assert(tlck->type & tlckXTREE); | |
720 | tlck->type |= tlckBTROOT; | |
721 | tlck->mp = mp; | |
722 | ilinelock = (struct linelock *) & tlck->lock; | |
723 | ||
724 | /* | |
725 | * copy xtree root from inode to dinode: | |
726 | */ | |
727 | p = &jfs_ip->i_xtroot; | |
728 | xp = (xtpage_t *) &dp->di_dirtable; | |
729 | lv = ilinelock->lv; | |
730 | for (n = 0; n < ilinelock->index; n++, lv++) { | |
731 | memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], | |
732 | lv->length << L2XTSLOTSIZE); | |
733 | } | |
734 | ||
735 | /* reset on-disk (metadata page) xtree XAD_NEW bit */ | |
736 | xad = &xp->xad[XTENTRYSTART]; | |
737 | for (n = XTENTRYSTART; | |
738 | n < le16_to_cpu(xp->header.nextindex); n++, xad++) | |
739 | if (xad->flag & (XAD_NEW | XAD_EXTENDED)) | |
740 | xad->flag &= ~(XAD_NEW | XAD_EXTENDED); | |
741 | } | |
742 | ||
743 | if ((lid = jfs_ip->blid) == 0) | |
744 | goto inlineData; | |
745 | jfs_ip->blid = 0; | |
746 | ||
747 | tlck = lid_to_tlock(lid); | |
748 | type = tlck->type; | |
749 | tlck->type |= tlckBTROOT; | |
750 | tlck->mp = mp; | |
751 | ilinelock = (struct linelock *) & tlck->lock; | |
752 | ||
753 | /* | |
754 | * regular file: 16 byte (XAD slot) granularity | |
755 | */ | |
756 | if (type & tlckXTREE) { | |
757 | xtpage_t *p, *xp; | |
758 | xad_t *xad; | |
759 | ||
760 | /* | |
761 | * copy xtree root from inode to dinode: | |
762 | */ | |
763 | p = &jfs_ip->i_xtroot; | |
764 | xp = &dp->di_xtroot; | |
765 | lv = ilinelock->lv; | |
766 | for (n = 0; n < ilinelock->index; n++, lv++) { | |
767 | memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], | |
768 | lv->length << L2XTSLOTSIZE); | |
769 | } | |
770 | ||
771 | /* reset on-disk (metadata page) xtree XAD_NEW bit */ | |
772 | xad = &xp->xad[XTENTRYSTART]; | |
773 | for (n = XTENTRYSTART; | |
774 | n < le16_to_cpu(xp->header.nextindex); n++, xad++) | |
775 | if (xad->flag & (XAD_NEW | XAD_EXTENDED)) | |
776 | xad->flag &= ~(XAD_NEW | XAD_EXTENDED); | |
777 | } | |
778 | /* | |
779 | * directory: 32 byte (directory entry slot) granularity | |
780 | */ | |
781 | else if (type & tlckDTREE) { | |
782 | dtpage_t *p, *xp; | |
783 | ||
784 | /* | |
785 | * copy dtree root from inode to dinode: | |
786 | */ | |
787 | p = (dtpage_t *) &jfs_ip->i_dtroot; | |
788 | xp = (dtpage_t *) & dp->di_dtroot; | |
789 | lv = ilinelock->lv; | |
790 | for (n = 0; n < ilinelock->index; n++, lv++) { | |
791 | memcpy(&xp->slot[lv->offset], &p->slot[lv->offset], | |
792 | lv->length << L2DTSLOTSIZE); | |
793 | } | |
794 | } else { | |
795 | jfs_err("diWrite: UFO tlock"); | |
796 | } | |
797 | ||
798 | inlineData: | |
799 | /* | |
800 | * copy inline symlink from in-memory inode to on-disk inode | |
801 | */ | |
802 | if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) { | |
803 | lv = & dilinelock->lv[dilinelock->index]; | |
804 | lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE; | |
805 | lv->length = 2; | |
806 | memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE); | |
807 | dilinelock->index++; | |
808 | } | |
809 | /* | |
810 | * copy inline data from in-memory inode to on-disk inode: | |
811 | * 128 byte slot granularity | |
812 | */ | |
813 | if (test_cflag(COMMIT_Inlineea, ip)) { | |
814 | lv = & dilinelock->lv[dilinelock->index]; | |
815 | lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE; | |
816 | lv->length = 1; | |
817 | memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE); | |
818 | dilinelock->index++; | |
819 | ||
820 | clear_cflag(COMMIT_Inlineea, ip); | |
821 | } | |
822 | ||
823 | /* | |
824 | * lock/copy inode base: 128 byte slot granularity | |
825 | */ | |
826 | // baseDinode: | |
827 | lv = & dilinelock->lv[dilinelock->index]; | |
828 | lv->offset = dioffset >> L2INODESLOTSIZE; | |
829 | copy_to_dinode(dp, ip); | |
830 | if (test_and_clear_cflag(COMMIT_Dirtable, ip)) { | |
831 | lv->length = 2; | |
832 | memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96); | |
833 | } else | |
834 | lv->length = 1; | |
835 | dilinelock->index++; | |
836 | ||
837 | #ifdef _JFS_FASTDASD | |
838 | /* | |
839 | * We aren't logging changes to the DASD used in directory inodes, | |
840 | * but we need to write them to disk. If we don't unmount cleanly, | |
841 | * mount will recalculate the DASD used. | |
842 | */ | |
843 | if (S_ISDIR(ip->i_mode) | |
844 | && (ip->i_ipmnt->i_mntflag & JFS_DASD_ENABLED)) | |
845 | memcpy(&dp->di_DASD, &ip->i_DASD, sizeof(struct dasd)); | |
846 | #endif /* _JFS_FASTDASD */ | |
847 | ||
848 | /* release the buffer holding the updated on-disk inode. | |
849 | * the buffer will be later written by commit processing. | |
850 | */ | |
851 | write_metapage(mp); | |
852 | ||
853 | return (rc); | |
854 | } | |
855 | ||
856 | ||
857 | /* | |
858 | * NAME: diFree(ip) | |
859 | * | |
860 | * FUNCTION: free a specified inode from the inode working map | |
861 | * for a fileset or aggregate. | |
862 | * | |
863 | * if the inode to be freed represents the first (only) | |
864 | * free inode within the iag, the iag will be placed on | |
865 | * the ag free inode list. | |
866 | * | |
867 | * freeing the inode will cause the inode extent to be | |
868 | * freed if the inode is the only allocated inode within | |
869 | * the extent. in this case all the disk resource backing | |
870 | * up the inode extent will be freed. in addition, the iag | |
871 | * will be placed on the ag extent free list if the extent | |
872 | * is the first free extent in the iag. if freeing the | |
873 | * extent also means that no free inodes will exist for | |
874 | * the iag, the iag will also be removed from the ag free | |
875 | * inode list. | |
876 | * | |
877 | * the iag describing the inode will be freed if the extent | |
878 | * is to be freed and it is the only backed extent within | |
879 | * the iag. in this case, the iag will be removed from the | |
880 | * ag free extent list and ag free inode list and placed on | |
881 | * the inode map's free iag list. | |
882 | * | |
883 | * a careful update approach is used to provide consistency | |
884 | * in the face of updates to multiple buffers. under this | |
885 | * approach, all required buffers are obtained before making | |
886 | * any updates and are held until all updates are complete. | |
887 | * | |
888 | * PARAMETERS: | |
889 | * ip - inode to be freed. | |
890 | * | |
891 | * RETURN VALUES: | |
892 | * 0 - success | |
893 | * -EIO - i/o error. | |
894 | */ | |
895 | int diFree(struct inode *ip) | |
896 | { | |
897 | int rc; | |
898 | ino_t inum = ip->i_ino; | |
899 | struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp; | |
900 | struct metapage *mp, *amp, *bmp, *cmp, *dmp; | |
901 | int iagno, ino, extno, bitno, sword, agno; | |
902 | int back, fwd; | |
903 | u32 bitmap, mask; | |
904 | struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; | |
905 | struct inomap *imap = JFS_IP(ipimap)->i_imap; | |
906 | pxd_t freepxd; | |
907 | tid_t tid; | |
908 | struct inode *iplist[3]; | |
909 | struct tlock *tlck; | |
910 | struct pxd_lock *pxdlock; | |
911 | ||
912 | /* | |
913 | * This is just to suppress compiler warnings. The same logic that | |
914 | * references these variables is used to initialize them. | |
915 | */ | |
916 | aiagp = biagp = ciagp = diagp = NULL; | |
917 | ||
918 | /* get the iag number containing the inode. | |
919 | */ | |
920 | iagno = INOTOIAG(inum); | |
921 | ||
922 | /* make sure that the iag is contained within | |
923 | * the map. | |
924 | */ | |
925 | if (iagno >= imap->im_nextiag) { | |
926 | dump_mem("imap", imap, 32); | |
927 | jfs_error(ip->i_sb, | |
928 | "diFree: inum = %d, iagno = %d, nextiag = %d", | |
929 | (uint) inum, iagno, imap->im_nextiag); | |
930 | return -EIO; | |
931 | } | |
932 | ||
933 | /* get the allocation group for this ino. | |
934 | */ | |
935 | agno = JFS_IP(ip)->agno; | |
936 | ||
937 | /* Lock the AG specific inode map information | |
938 | */ | |
939 | AG_LOCK(imap, agno); | |
940 | ||
941 | /* Obtain read lock in imap inode. Don't release it until we have | |
942 | * read all of the IAG's that we are going to. | |
943 | */ | |
944 | IREAD_LOCK(ipimap); | |
945 | ||
946 | /* read the iag. | |
947 | */ | |
948 | if ((rc = diIAGRead(imap, iagno, &mp))) { | |
949 | IREAD_UNLOCK(ipimap); | |
950 | AG_UNLOCK(imap, agno); | |
951 | return (rc); | |
952 | } | |
953 | iagp = (struct iag *) mp->data; | |
954 | ||
955 | /* get the inode number and extent number of the inode within | |
956 | * the iag and the inode number within the extent. | |
957 | */ | |
958 | ino = inum & (INOSPERIAG - 1); | |
959 | extno = ino >> L2INOSPEREXT; | |
960 | bitno = ino & (INOSPEREXT - 1); | |
961 | mask = HIGHORDER >> bitno; | |
962 | ||
963 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { | |
964 | jfs_error(ip->i_sb, | |
965 | "diFree: wmap shows inode already free"); | |
966 | } | |
967 | ||
968 | if (!addressPXD(&iagp->inoext[extno])) { | |
969 | release_metapage(mp); | |
970 | IREAD_UNLOCK(ipimap); | |
971 | AG_UNLOCK(imap, agno); | |
972 | jfs_error(ip->i_sb, "diFree: invalid inoext"); | |
973 | return -EIO; | |
974 | } | |
975 | ||
976 | /* compute the bitmap for the extent reflecting the freed inode. | |
977 | */ | |
978 | bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask; | |
979 | ||
980 | if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) { | |
981 | release_metapage(mp); | |
982 | IREAD_UNLOCK(ipimap); | |
983 | AG_UNLOCK(imap, agno); | |
984 | jfs_error(ip->i_sb, "diFree: numfree > numinos"); | |
985 | return -EIO; | |
986 | } | |
987 | /* | |
988 | * inode extent still has some inodes or below low water mark: | |
989 | * keep the inode extent; | |
990 | */ | |
991 | if (bitmap || | |
992 | imap->im_agctl[agno].numfree < 96 || | |
993 | (imap->im_agctl[agno].numfree < 288 && | |
994 | (((imap->im_agctl[agno].numfree * 100) / | |
995 | imap->im_agctl[agno].numinos) <= 25))) { | |
996 | /* if the iag currently has no free inodes (i.e., | |
997 | * the inode being freed is the first free inode of iag), | |
998 | * insert the iag at head of the inode free list for the ag. | |
999 | */ | |
1000 | if (iagp->nfreeinos == 0) { | |
1001 | /* check if there are any iags on the ag inode | |
1002 | * free list. if so, read the first one so that | |
1003 | * we can link the current iag onto the list at | |
1004 | * the head. | |
1005 | */ | |
1006 | if ((fwd = imap->im_agctl[agno].inofree) >= 0) { | |
1007 | /* read the iag that currently is the head | |
1008 | * of the list. | |
1009 | */ | |
1010 | if ((rc = diIAGRead(imap, fwd, &))) { | |
1011 | IREAD_UNLOCK(ipimap); | |
1012 | AG_UNLOCK(imap, agno); | |
1013 | release_metapage(mp); | |
1014 | return (rc); | |
1015 | } | |
1016 | aiagp = (struct iag *) amp->data; | |
1017 | ||
1018 | /* make current head point back to the iag. | |
1019 | */ | |
1020 | aiagp->inofreeback = cpu_to_le32(iagno); | |
1021 | ||
1022 | write_metapage(amp); | |
1023 | } | |
1024 | ||
1025 | /* iag points forward to current head and iag | |
1026 | * becomes the new head of the list. | |
1027 | */ | |
1028 | iagp->inofreefwd = | |
1029 | cpu_to_le32(imap->im_agctl[agno].inofree); | |
1030 | iagp->inofreeback = cpu_to_le32(-1); | |
1031 | imap->im_agctl[agno].inofree = iagno; | |
1032 | } | |
1033 | IREAD_UNLOCK(ipimap); | |
1034 | ||
1035 | /* update the free inode summary map for the extent if | |
1036 | * freeing the inode means the extent will now have free | |
1037 | * inodes (i.e., the inode being freed is the first free | |
1038 | * inode of extent), | |
1039 | */ | |
1040 | if (iagp->wmap[extno] == cpu_to_le32(ONES)) { | |
1041 | sword = extno >> L2EXTSPERSUM; | |
1042 | bitno = extno & (EXTSPERSUM - 1); | |
1043 | iagp->inosmap[sword] &= | |
1044 | cpu_to_le32(~(HIGHORDER >> bitno)); | |
1045 | } | |
1046 | ||
1047 | /* update the bitmap. | |
1048 | */ | |
1049 | iagp->wmap[extno] = cpu_to_le32(bitmap); | |
1050 | DBG_DIFREE(imap, inum); | |
1051 | ||
1052 | /* update the free inode counts at the iag, ag and | |
1053 | * map level. | |
1054 | */ | |
1055 | iagp->nfreeinos = | |
1056 | cpu_to_le32(le32_to_cpu(iagp->nfreeinos) + 1); | |
1057 | imap->im_agctl[agno].numfree += 1; | |
1058 | atomic_inc(&imap->im_numfree); | |
1059 | ||
1060 | /* release the AG inode map lock | |
1061 | */ | |
1062 | AG_UNLOCK(imap, agno); | |
1063 | ||
1064 | /* write the iag */ | |
1065 | write_metapage(mp); | |
1066 | ||
1067 | return (0); | |
1068 | } | |
1069 | ||
1070 | ||
1071 | /* | |
1072 | * inode extent has become free and above low water mark: | |
1073 | * free the inode extent; | |
1074 | */ | |
1075 | ||
1076 | /* | |
1077 | * prepare to update iag list(s) (careful update step 1) | |
1078 | */ | |
1079 | amp = bmp = cmp = dmp = NULL; | |
1080 | fwd = back = -1; | |
1081 | ||
1082 | /* check if the iag currently has no free extents. if so, | |
1083 | * it will be placed on the head of the ag extent free list. | |
1084 | */ | |
1085 | if (iagp->nfreeexts == 0) { | |
1086 | /* check if the ag extent free list has any iags. | |
1087 | * if so, read the iag at the head of the list now. | |
1088 | * this (head) iag will be updated later to reflect | |
1089 | * the addition of the current iag at the head of | |
1090 | * the list. | |
1091 | */ | |
1092 | if ((fwd = imap->im_agctl[agno].extfree) >= 0) { | |
1093 | if ((rc = diIAGRead(imap, fwd, &))) | |
1094 | goto error_out; | |
1095 | aiagp = (struct iag *) amp->data; | |
1096 | } | |
1097 | } else { | |
1098 | /* iag has free extents. check if the addition of a free | |
1099 | * extent will cause all extents to be free within this | |
1100 | * iag. if so, the iag will be removed from the ag extent | |
1101 | * free list and placed on the inode map's free iag list. | |
1102 | */ | |
1103 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { | |
1104 | /* in preparation for removing the iag from the | |
1105 | * ag extent free list, read the iags preceeding | |
1106 | * and following the iag on the ag extent free | |
1107 | * list. | |
1108 | */ | |
1109 | if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { | |
1110 | if ((rc = diIAGRead(imap, fwd, &))) | |
1111 | goto error_out; | |
1112 | aiagp = (struct iag *) amp->data; | |
1113 | } | |
1114 | ||
1115 | if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { | |
1116 | if ((rc = diIAGRead(imap, back, &bmp))) | |
1117 | goto error_out; | |
1118 | biagp = (struct iag *) bmp->data; | |
1119 | } | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* remove the iag from the ag inode free list if freeing | |
1124 | * this extent cause the iag to have no free inodes. | |
1125 | */ | |
1126 | if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { | |
1127 | int inofreeback = le32_to_cpu(iagp->inofreeback); | |
1128 | int inofreefwd = le32_to_cpu(iagp->inofreefwd); | |
1129 | ||
1130 | /* in preparation for removing the iag from the | |
1131 | * ag inode free list, read the iags preceeding | |
1132 | * and following the iag on the ag inode free | |
1133 | * list. before reading these iags, we must make | |
1134 | * sure that we already don't have them in hand | |
1135 | * from up above, since re-reading an iag (buffer) | |
1136 | * we are currently holding would cause a deadlock. | |
1137 | */ | |
1138 | if (inofreefwd >= 0) { | |
1139 | ||
1140 | if (inofreefwd == fwd) | |
1141 | ciagp = (struct iag *) amp->data; | |
1142 | else if (inofreefwd == back) | |
1143 | ciagp = (struct iag *) bmp->data; | |
1144 | else { | |
1145 | if ((rc = | |
1146 | diIAGRead(imap, inofreefwd, &cmp))) | |
1147 | goto error_out; | |
1148 | ciagp = (struct iag *) cmp->data; | |
1149 | } | |
1150 | assert(ciagp != NULL); | |
1151 | } | |
1152 | ||
1153 | if (inofreeback >= 0) { | |
1154 | if (inofreeback == fwd) | |
1155 | diagp = (struct iag *) amp->data; | |
1156 | else if (inofreeback == back) | |
1157 | diagp = (struct iag *) bmp->data; | |
1158 | else { | |
1159 | if ((rc = | |
1160 | diIAGRead(imap, inofreeback, &dmp))) | |
1161 | goto error_out; | |
1162 | diagp = (struct iag *) dmp->data; | |
1163 | } | |
1164 | assert(diagp != NULL); | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | IREAD_UNLOCK(ipimap); | |
1169 | ||
1170 | /* | |
1171 | * invalidate any page of the inode extent freed from buffer cache; | |
1172 | */ | |
1173 | freepxd = iagp->inoext[extno]; | |
1174 | invalidate_pxd_metapages(ip, freepxd); | |
1175 | ||
1176 | /* | |
1177 | * update iag list(s) (careful update step 2) | |
1178 | */ | |
1179 | /* add the iag to the ag extent free list if this is the | |
1180 | * first free extent for the iag. | |
1181 | */ | |
1182 | if (iagp->nfreeexts == 0) { | |
1183 | if (fwd >= 0) | |
1184 | aiagp->extfreeback = cpu_to_le32(iagno); | |
1185 | ||
1186 | iagp->extfreefwd = | |
1187 | cpu_to_le32(imap->im_agctl[agno].extfree); | |
1188 | iagp->extfreeback = cpu_to_le32(-1); | |
1189 | imap->im_agctl[agno].extfree = iagno; | |
1190 | } else { | |
1191 | /* remove the iag from the ag extent list if all extents | |
1192 | * are now free and place it on the inode map iag free list. | |
1193 | */ | |
1194 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { | |
1195 | if (fwd >= 0) | |
1196 | aiagp->extfreeback = iagp->extfreeback; | |
1197 | ||
1198 | if (back >= 0) | |
1199 | biagp->extfreefwd = iagp->extfreefwd; | |
1200 | else | |
1201 | imap->im_agctl[agno].extfree = | |
1202 | le32_to_cpu(iagp->extfreefwd); | |
1203 | ||
1204 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); | |
1205 | ||
1206 | IAGFREE_LOCK(imap); | |
1207 | iagp->iagfree = cpu_to_le32(imap->im_freeiag); | |
1208 | imap->im_freeiag = iagno; | |
1209 | IAGFREE_UNLOCK(imap); | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | /* remove the iag from the ag inode free list if freeing | |
1214 | * this extent causes the iag to have no free inodes. | |
1215 | */ | |
1216 | if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { | |
1217 | if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) | |
1218 | ciagp->inofreeback = iagp->inofreeback; | |
1219 | ||
1220 | if ((int) le32_to_cpu(iagp->inofreeback) >= 0) | |
1221 | diagp->inofreefwd = iagp->inofreefwd; | |
1222 | else | |
1223 | imap->im_agctl[agno].inofree = | |
1224 | le32_to_cpu(iagp->inofreefwd); | |
1225 | ||
1226 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); | |
1227 | } | |
1228 | ||
1229 | /* update the inode extent address and working map | |
1230 | * to reflect the free extent. | |
1231 | * the permanent map should have been updated already | |
1232 | * for the inode being freed. | |
1233 | */ | |
1234 | if (iagp->pmap[extno] != 0) { | |
1235 | jfs_error(ip->i_sb, "diFree: the pmap does not show inode free"); | |
1236 | } | |
1237 | iagp->wmap[extno] = 0; | |
1238 | DBG_DIFREE(imap, inum); | |
1239 | PXDlength(&iagp->inoext[extno], 0); | |
1240 | PXDaddress(&iagp->inoext[extno], 0); | |
1241 | ||
1242 | /* update the free extent and free inode summary maps | |
1243 | * to reflect the freed extent. | |
1244 | * the inode summary map is marked to indicate no inodes | |
1245 | * available for the freed extent. | |
1246 | */ | |
1247 | sword = extno >> L2EXTSPERSUM; | |
1248 | bitno = extno & (EXTSPERSUM - 1); | |
1249 | mask = HIGHORDER >> bitno; | |
1250 | iagp->inosmap[sword] |= cpu_to_le32(mask); | |
1251 | iagp->extsmap[sword] &= cpu_to_le32(~mask); | |
1252 | ||
1253 | /* update the number of free inodes and number of free extents | |
1254 | * for the iag. | |
1255 | */ | |
1256 | iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) - | |
1257 | (INOSPEREXT - 1)); | |
1258 | iagp->nfreeexts = cpu_to_le32(le32_to_cpu(iagp->nfreeexts) + 1); | |
1259 | ||
1260 | /* update the number of free inodes and backed inodes | |
1261 | * at the ag and inode map level. | |
1262 | */ | |
1263 | imap->im_agctl[agno].numfree -= (INOSPEREXT - 1); | |
1264 | imap->im_agctl[agno].numinos -= INOSPEREXT; | |
1265 | atomic_sub(INOSPEREXT - 1, &imap->im_numfree); | |
1266 | atomic_sub(INOSPEREXT, &imap->im_numinos); | |
1267 | ||
1268 | if (amp) | |
1269 | write_metapage(amp); | |
1270 | if (bmp) | |
1271 | write_metapage(bmp); | |
1272 | if (cmp) | |
1273 | write_metapage(cmp); | |
1274 | if (dmp) | |
1275 | write_metapage(dmp); | |
1276 | ||
1277 | /* | |
1278 | * start transaction to update block allocation map | |
1279 | * for the inode extent freed; | |
1280 | * | |
1281 | * N.B. AG_LOCK is released and iag will be released below, and | |
1282 | * other thread may allocate inode from/reusing the ixad freed | |
1283 | * BUT with new/different backing inode extent from the extent | |
1284 | * to be freed by the transaction; | |
1285 | */ | |
1286 | tid = txBegin(ipimap->i_sb, COMMIT_FORCE); | |
1287 | down(&JFS_IP(ipimap)->commit_sem); | |
1288 | ||
1289 | /* acquire tlock of the iag page of the freed ixad | |
1290 | * to force the page NOHOMEOK (even though no data is | |
1291 | * logged from the iag page) until NOREDOPAGE|FREEXTENT log | |
1292 | * for the free of the extent is committed; | |
1293 | * write FREEXTENT|NOREDOPAGE log record | |
1294 | * N.B. linelock is overlaid as freed extent descriptor; | |
1295 | */ | |
1296 | tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE); | |
1297 | pxdlock = (struct pxd_lock *) & tlck->lock; | |
1298 | pxdlock->flag = mlckFREEPXD; | |
1299 | pxdlock->pxd = freepxd; | |
1300 | pxdlock->index = 1; | |
1301 | ||
1302 | write_metapage(mp); | |
1303 | ||
1304 | iplist[0] = ipimap; | |
1305 | ||
1306 | /* | |
1307 | * logredo needs the IAG number and IAG extent index in order | |
1308 | * to ensure that the IMap is consistent. The least disruptive | |
1309 | * way to pass these values through to the transaction manager | |
1310 | * is in the iplist array. | |
1311 | * | |
1312 | * It's not pretty, but it works. | |
1313 | */ | |
1314 | iplist[1] = (struct inode *) (size_t)iagno; | |
1315 | iplist[2] = (struct inode *) (size_t)extno; | |
1316 | ||
1317 | rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); | |
1318 | ||
1319 | txEnd(tid); | |
1320 | up(&JFS_IP(ipimap)->commit_sem); | |
1321 | ||
1322 | /* unlock the AG inode map information */ | |
1323 | AG_UNLOCK(imap, agno); | |
1324 | ||
1325 | return (0); | |
1326 | ||
1327 | error_out: | |
1328 | IREAD_UNLOCK(ipimap); | |
1329 | ||
1330 | if (amp) | |
1331 | release_metapage(amp); | |
1332 | if (bmp) | |
1333 | release_metapage(bmp); | |
1334 | if (cmp) | |
1335 | release_metapage(cmp); | |
1336 | if (dmp) | |
1337 | release_metapage(dmp); | |
1338 | ||
1339 | AG_UNLOCK(imap, agno); | |
1340 | ||
1341 | release_metapage(mp); | |
1342 | ||
1343 | return (rc); | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * There are several places in the diAlloc* routines where we initialize | |
1348 | * the inode. | |
1349 | */ | |
1350 | static inline void | |
1351 | diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp) | |
1352 | { | |
1353 | struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); | |
1354 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
1355 | ||
1356 | ip->i_ino = (iagno << L2INOSPERIAG) + ino; | |
1357 | DBG_DIALLOC(JFS_IP(ipimap)->i_imap, ip->i_ino); | |
1358 | jfs_ip->ixpxd = iagp->inoext[extno]; | |
1359 | jfs_ip->agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); | |
1360 | jfs_ip->active_ag = -1; | |
1361 | } | |
1362 | ||
1363 | ||
1364 | /* | |
1365 | * NAME: diAlloc(pip,dir,ip) | |
1366 | * | |
1367 | * FUNCTION: allocate a disk inode from the inode working map | |
1368 | * for a fileset or aggregate. | |
1369 | * | |
1370 | * PARAMETERS: | |
1371 | * pip - pointer to incore inode for the parent inode. | |
1372 | * dir - TRUE if the new disk inode is for a directory. | |
1373 | * ip - pointer to a new inode | |
1374 | * | |
1375 | * RETURN VALUES: | |
1376 | * 0 - success. | |
1377 | * -ENOSPC - insufficient disk resources. | |
1378 | * -EIO - i/o error. | |
1379 | */ | |
1380 | int diAlloc(struct inode *pip, boolean_t dir, struct inode *ip) | |
1381 | { | |
1382 | int rc, ino, iagno, addext, extno, bitno, sword; | |
1383 | int nwords, rem, i, agno; | |
1384 | u32 mask, inosmap, extsmap; | |
1385 | struct inode *ipimap; | |
1386 | struct metapage *mp; | |
1387 | ino_t inum; | |
1388 | struct iag *iagp; | |
1389 | struct inomap *imap; | |
1390 | ||
1391 | /* get the pointers to the inode map inode and the | |
1392 | * corresponding imap control structure. | |
1393 | */ | |
1394 | ipimap = JFS_SBI(pip->i_sb)->ipimap; | |
1395 | imap = JFS_IP(ipimap)->i_imap; | |
1396 | JFS_IP(ip)->ipimap = ipimap; | |
1397 | JFS_IP(ip)->fileset = FILESYSTEM_I; | |
1398 | ||
1399 | /* for a directory, the allocation policy is to start | |
1400 | * at the ag level using the preferred ag. | |
1401 | */ | |
1402 | if (dir == TRUE) { | |
1403 | agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); | |
1404 | AG_LOCK(imap, agno); | |
1405 | goto tryag; | |
1406 | } | |
1407 | ||
1408 | /* for files, the policy starts off by trying to allocate from | |
1409 | * the same iag containing the parent disk inode: | |
1410 | * try to allocate the new disk inode close to the parent disk | |
1411 | * inode, using parent disk inode number + 1 as the allocation | |
1412 | * hint. (we use a left-to-right policy to attempt to avoid | |
1413 | * moving backward on the disk.) compute the hint within the | |
1414 | * file system and the iag. | |
1415 | */ | |
1416 | ||
1417 | /* get the ag number of this iag */ | |
1418 | agno = JFS_IP(pip)->agno; | |
1419 | ||
1420 | if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) { | |
1421 | /* | |
1422 | * There is an open file actively growing. We want to | |
1423 | * allocate new inodes from a different ag to avoid | |
1424 | * fragmentation problems. | |
1425 | */ | |
1426 | agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); | |
1427 | AG_LOCK(imap, agno); | |
1428 | goto tryag; | |
1429 | } | |
1430 | ||
1431 | inum = pip->i_ino + 1; | |
1432 | ino = inum & (INOSPERIAG - 1); | |
1433 | ||
1434 | /* back off the the hint if it is outside of the iag */ | |
1435 | if (ino == 0) | |
1436 | inum = pip->i_ino; | |
1437 | ||
1438 | /* lock the AG inode map information */ | |
1439 | AG_LOCK(imap, agno); | |
1440 | ||
1441 | /* Get read lock on imap inode */ | |
1442 | IREAD_LOCK(ipimap); | |
1443 | ||
1444 | /* get the iag number and read the iag */ | |
1445 | iagno = INOTOIAG(inum); | |
1446 | if ((rc = diIAGRead(imap, iagno, &mp))) { | |
1447 | IREAD_UNLOCK(ipimap); | |
1448 | AG_UNLOCK(imap, agno); | |
1449 | return (rc); | |
1450 | } | |
1451 | iagp = (struct iag *) mp->data; | |
1452 | ||
1453 | /* determine if new inode extent is allowed to be added to the iag. | |
1454 | * new inode extent can be added to the iag if the ag | |
1455 | * has less than 32 free disk inodes and the iag has free extents. | |
1456 | */ | |
1457 | addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts); | |
1458 | ||
1459 | /* | |
1460 | * try to allocate from the IAG | |
1461 | */ | |
1462 | /* check if the inode may be allocated from the iag | |
1463 | * (i.e. the inode has free inodes or new extent can be added). | |
1464 | */ | |
1465 | if (iagp->nfreeinos || addext) { | |
1466 | /* determine the extent number of the hint. | |
1467 | */ | |
1468 | extno = ino >> L2INOSPEREXT; | |
1469 | ||
1470 | /* check if the extent containing the hint has backed | |
1471 | * inodes. if so, try to allocate within this extent. | |
1472 | */ | |
1473 | if (addressPXD(&iagp->inoext[extno])) { | |
1474 | bitno = ino & (INOSPEREXT - 1); | |
1475 | if ((bitno = | |
1476 | diFindFree(le32_to_cpu(iagp->wmap[extno]), | |
1477 | bitno)) | |
1478 | < INOSPEREXT) { | |
1479 | ino = (extno << L2INOSPEREXT) + bitno; | |
1480 | ||
1481 | /* a free inode (bit) was found within this | |
1482 | * extent, so allocate it. | |
1483 | */ | |
1484 | rc = diAllocBit(imap, iagp, ino); | |
1485 | IREAD_UNLOCK(ipimap); | |
1486 | if (rc) { | |
1487 | assert(rc == -EIO); | |
1488 | } else { | |
1489 | /* set the results of the allocation | |
1490 | * and write the iag. | |
1491 | */ | |
1492 | diInitInode(ip, iagno, ino, extno, | |
1493 | iagp); | |
1494 | mark_metapage_dirty(mp); | |
1495 | } | |
1496 | release_metapage(mp); | |
1497 | ||
1498 | /* free the AG lock and return. | |
1499 | */ | |
1500 | AG_UNLOCK(imap, agno); | |
1501 | return (rc); | |
1502 | } | |
1503 | ||
1504 | if (!addext) | |
1505 | extno = | |
1506 | (extno == | |
1507 | EXTSPERIAG - 1) ? 0 : extno + 1; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * no free inodes within the extent containing the hint. | |
1512 | * | |
1513 | * try to allocate from the backed extents following | |
1514 | * hint or, if appropriate (i.e. addext is true), allocate | |
1515 | * an extent of free inodes at or following the extent | |
1516 | * containing the hint. | |
1517 | * | |
1518 | * the free inode and free extent summary maps are used | |
1519 | * here, so determine the starting summary map position | |
1520 | * and the number of words we'll have to examine. again, | |
1521 | * the approach is to allocate following the hint, so we | |
1522 | * might have to initially ignore prior bits of the summary | |
1523 | * map that represent extents prior to the extent containing | |
1524 | * the hint and later revisit these bits. | |
1525 | */ | |
1526 | bitno = extno & (EXTSPERSUM - 1); | |
1527 | nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1; | |
1528 | sword = extno >> L2EXTSPERSUM; | |
1529 | ||
1530 | /* mask any prior bits for the starting words of the | |
1531 | * summary map. | |
1532 | */ | |
1533 | mask = ONES << (EXTSPERSUM - bitno); | |
1534 | inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask; | |
1535 | extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask; | |
1536 | ||
1537 | /* scan the free inode and free extent summary maps for | |
1538 | * free resources. | |
1539 | */ | |
1540 | for (i = 0; i < nwords; i++) { | |
1541 | /* check if this word of the free inode summary | |
1542 | * map describes an extent with free inodes. | |
1543 | */ | |
1544 | if (~inosmap) { | |
1545 | /* an extent with free inodes has been | |
1546 | * found. determine the extent number | |
1547 | * and the inode number within the extent. | |
1548 | */ | |
1549 | rem = diFindFree(inosmap, 0); | |
1550 | extno = (sword << L2EXTSPERSUM) + rem; | |
1551 | rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), | |
1552 | 0); | |
1553 | if (rem >= INOSPEREXT) { | |
1554 | IREAD_UNLOCK(ipimap); | |
1555 | release_metapage(mp); | |
1556 | AG_UNLOCK(imap, agno); | |
1557 | jfs_error(ip->i_sb, | |
1558 | "diAlloc: can't find free bit " | |
1559 | "in wmap"); | |
1560 | return EIO; | |
1561 | } | |
1562 | ||
1563 | /* determine the inode number within the | |
1564 | * iag and allocate the inode from the | |
1565 | * map. | |
1566 | */ | |
1567 | ino = (extno << L2INOSPEREXT) + rem; | |
1568 | rc = diAllocBit(imap, iagp, ino); | |
1569 | IREAD_UNLOCK(ipimap); | |
1570 | if (rc) | |
1571 | assert(rc == -EIO); | |
1572 | else { | |
1573 | /* set the results of the allocation | |
1574 | * and write the iag. | |
1575 | */ | |
1576 | diInitInode(ip, iagno, ino, extno, | |
1577 | iagp); | |
1578 | mark_metapage_dirty(mp); | |
1579 | } | |
1580 | release_metapage(mp); | |
1581 | ||
1582 | /* free the AG lock and return. | |
1583 | */ | |
1584 | AG_UNLOCK(imap, agno); | |
1585 | return (rc); | |
1586 | ||
1587 | } | |
1588 | ||
1589 | /* check if we may allocate an extent of free | |
1590 | * inodes and whether this word of the free | |
1591 | * extents summary map describes a free extent. | |
1592 | */ | |
1593 | if (addext && ~extsmap) { | |
1594 | /* a free extent has been found. determine | |
1595 | * the extent number. | |
1596 | */ | |
1597 | rem = diFindFree(extsmap, 0); | |
1598 | extno = (sword << L2EXTSPERSUM) + rem; | |
1599 | ||
1600 | /* allocate an extent of free inodes. | |
1601 | */ | |
1602 | if ((rc = diNewExt(imap, iagp, extno))) { | |
1603 | /* if there is no disk space for a | |
1604 | * new extent, try to allocate the | |
1605 | * disk inode from somewhere else. | |
1606 | */ | |
1607 | if (rc == -ENOSPC) | |
1608 | break; | |
1609 | ||
1610 | assert(rc == -EIO); | |
1611 | } else { | |
1612 | /* set the results of the allocation | |
1613 | * and write the iag. | |
1614 | */ | |
1615 | diInitInode(ip, iagno, | |
1616 | extno << L2INOSPEREXT, | |
1617 | extno, iagp); | |
1618 | mark_metapage_dirty(mp); | |
1619 | } | |
1620 | release_metapage(mp); | |
1621 | /* free the imap inode & the AG lock & return. | |
1622 | */ | |
1623 | IREAD_UNLOCK(ipimap); | |
1624 | AG_UNLOCK(imap, agno); | |
1625 | return (rc); | |
1626 | } | |
1627 | ||
1628 | /* move on to the next set of summary map words. | |
1629 | */ | |
1630 | sword = (sword == SMAPSZ - 1) ? 0 : sword + 1; | |
1631 | inosmap = le32_to_cpu(iagp->inosmap[sword]); | |
1632 | extsmap = le32_to_cpu(iagp->extsmap[sword]); | |
1633 | } | |
1634 | } | |
1635 | /* unlock imap inode */ | |
1636 | IREAD_UNLOCK(ipimap); | |
1637 | ||
1638 | /* nothing doing in this iag, so release it. */ | |
1639 | release_metapage(mp); | |
1640 | ||
1641 | tryag: | |
1642 | /* | |
1643 | * try to allocate anywhere within the same AG as the parent inode. | |
1644 | */ | |
1645 | rc = diAllocAG(imap, agno, dir, ip); | |
1646 | ||
1647 | AG_UNLOCK(imap, agno); | |
1648 | ||
1649 | if (rc != -ENOSPC) | |
1650 | return (rc); | |
1651 | ||
1652 | /* | |
1653 | * try to allocate in any AG. | |
1654 | */ | |
1655 | return (diAllocAny(imap, agno, dir, ip)); | |
1656 | } | |
1657 | ||
1658 | ||
1659 | /* | |
1660 | * NAME: diAllocAG(imap,agno,dir,ip) | |
1661 | * | |
1662 | * FUNCTION: allocate a disk inode from the allocation group. | |
1663 | * | |
1664 | * this routine first determines if a new extent of free | |
1665 | * inodes should be added for the allocation group, with | |
1666 | * the current request satisfied from this extent. if this | |
1667 | * is the case, an attempt will be made to do just that. if | |
1668 | * this attempt fails or it has been determined that a new | |
1669 | * extent should not be added, an attempt is made to satisfy | |
1670 | * the request by allocating an existing (backed) free inode | |
1671 | * from the allocation group. | |
1672 | * | |
1673 | * PRE CONDITION: Already have the AG lock for this AG. | |
1674 | * | |
1675 | * PARAMETERS: | |
1676 | * imap - pointer to inode map control structure. | |
1677 | * agno - allocation group to allocate from. | |
1678 | * dir - TRUE if the new disk inode is for a directory. | |
1679 | * ip - pointer to the new inode to be filled in on successful return | |
1680 | * with the disk inode number allocated, its extent address | |
1681 | * and the start of the ag. | |
1682 | * | |
1683 | * RETURN VALUES: | |
1684 | * 0 - success. | |
1685 | * -ENOSPC - insufficient disk resources. | |
1686 | * -EIO - i/o error. | |
1687 | */ | |
1688 | static int | |
1689 | diAllocAG(struct inomap * imap, int agno, boolean_t dir, struct inode *ip) | |
1690 | { | |
1691 | int rc, addext, numfree, numinos; | |
1692 | ||
1693 | /* get the number of free and the number of backed disk | |
1694 | * inodes currently within the ag. | |
1695 | */ | |
1696 | numfree = imap->im_agctl[agno].numfree; | |
1697 | numinos = imap->im_agctl[agno].numinos; | |
1698 | ||
1699 | if (numfree > numinos) { | |
1700 | jfs_error(ip->i_sb, "diAllocAG: numfree > numinos"); | |
1701 | return -EIO; | |
1702 | } | |
1703 | ||
1704 | /* determine if we should allocate a new extent of free inodes | |
1705 | * within the ag: for directory inodes, add a new extent | |
1706 | * if there are a small number of free inodes or number of free | |
1707 | * inodes is a small percentage of the number of backed inodes. | |
1708 | */ | |
1709 | if (dir == TRUE) | |
1710 | addext = (numfree < 64 || | |
1711 | (numfree < 256 | |
1712 | && ((numfree * 100) / numinos) <= 20)); | |
1713 | else | |
1714 | addext = (numfree == 0); | |
1715 | ||
1716 | /* | |
1717 | * try to allocate a new extent of free inodes. | |
1718 | */ | |
1719 | if (addext) { | |
1720 | /* if free space is not avaliable for this new extent, try | |
1721 | * below to allocate a free and existing (already backed) | |
1722 | * inode from the ag. | |
1723 | */ | |
1724 | if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC) | |
1725 | return (rc); | |
1726 | } | |
1727 | ||
1728 | /* | |
1729 | * try to allocate an existing free inode from the ag. | |
1730 | */ | |
1731 | return (diAllocIno(imap, agno, ip)); | |
1732 | } | |
1733 | ||
1734 | ||
1735 | /* | |
1736 | * NAME: diAllocAny(imap,agno,dir,iap) | |
1737 | * | |
1738 | * FUNCTION: allocate a disk inode from any other allocation group. | |
1739 | * | |
1740 | * this routine is called when an allocation attempt within | |
1741 | * the primary allocation group has failed. if attempts to | |
1742 | * allocate an inode from any allocation group other than the | |
1743 | * specified primary group. | |
1744 | * | |
1745 | * PARAMETERS: | |
1746 | * imap - pointer to inode map control structure. | |
1747 | * agno - primary allocation group (to avoid). | |
1748 | * dir - TRUE if the new disk inode is for a directory. | |
1749 | * ip - pointer to a new inode to be filled in on successful return | |
1750 | * with the disk inode number allocated, its extent address | |
1751 | * and the start of the ag. | |
1752 | * | |
1753 | * RETURN VALUES: | |
1754 | * 0 - success. | |
1755 | * -ENOSPC - insufficient disk resources. | |
1756 | * -EIO - i/o error. | |
1757 | */ | |
1758 | static int | |
1759 | diAllocAny(struct inomap * imap, int agno, boolean_t dir, struct inode *ip) | |
1760 | { | |
1761 | int ag, rc; | |
1762 | int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag; | |
1763 | ||
1764 | ||
1765 | /* try to allocate from the ags following agno up to | |
1766 | * the maximum ag number. | |
1767 | */ | |
1768 | for (ag = agno + 1; ag <= maxag; ag++) { | |
1769 | AG_LOCK(imap, ag); | |
1770 | ||
1771 | rc = diAllocAG(imap, ag, dir, ip); | |
1772 | ||
1773 | AG_UNLOCK(imap, ag); | |
1774 | ||
1775 | if (rc != -ENOSPC) | |
1776 | return (rc); | |
1777 | } | |
1778 | ||
1779 | /* try to allocate from the ags in front of agno. | |
1780 | */ | |
1781 | for (ag = 0; ag < agno; ag++) { | |
1782 | AG_LOCK(imap, ag); | |
1783 | ||
1784 | rc = diAllocAG(imap, ag, dir, ip); | |
1785 | ||
1786 | AG_UNLOCK(imap, ag); | |
1787 | ||
1788 | if (rc != -ENOSPC) | |
1789 | return (rc); | |
1790 | } | |
1791 | ||
1792 | /* no free disk inodes. | |
1793 | */ | |
1794 | return -ENOSPC; | |
1795 | } | |
1796 | ||
1797 | ||
1798 | /* | |
1799 | * NAME: diAllocIno(imap,agno,ip) | |
1800 | * | |
1801 | * FUNCTION: allocate a disk inode from the allocation group's free | |
1802 | * inode list, returning an error if this free list is | |
1803 | * empty (i.e. no iags on the list). | |
1804 | * | |
1805 | * allocation occurs from the first iag on the list using | |
1806 | * the iag's free inode summary map to find the leftmost | |
1807 | * free inode in the iag. | |
1808 | * | |
1809 | * PRE CONDITION: Already have AG lock for this AG. | |
1810 | * | |
1811 | * PARAMETERS: | |
1812 | * imap - pointer to inode map control structure. | |
1813 | * agno - allocation group. | |
1814 | * ip - pointer to new inode to be filled in on successful return | |
1815 | * with the disk inode number allocated, its extent address | |
1816 | * and the start of the ag. | |
1817 | * | |
1818 | * RETURN VALUES: | |
1819 | * 0 - success. | |
1820 | * -ENOSPC - insufficient disk resources. | |
1821 | * -EIO - i/o error. | |
1822 | */ | |
1823 | static int diAllocIno(struct inomap * imap, int agno, struct inode *ip) | |
1824 | { | |
1825 | int iagno, ino, rc, rem, extno, sword; | |
1826 | struct metapage *mp; | |
1827 | struct iag *iagp; | |
1828 | ||
1829 | /* check if there are iags on the ag's free inode list. | |
1830 | */ | |
1831 | if ((iagno = imap->im_agctl[agno].inofree) < 0) | |
1832 | return -ENOSPC; | |
1833 | ||
1834 | /* obtain read lock on imap inode */ | |
1835 | IREAD_LOCK(imap->im_ipimap); | |
1836 | ||
1837 | /* read the iag at the head of the list. | |
1838 | */ | |
1839 | if ((rc = diIAGRead(imap, iagno, &mp))) { | |
1840 | IREAD_UNLOCK(imap->im_ipimap); | |
1841 | return (rc); | |
1842 | } | |
1843 | iagp = (struct iag *) mp->data; | |
1844 | ||
1845 | /* better be free inodes in this iag if it is on the | |
1846 | * list. | |
1847 | */ | |
1848 | if (!iagp->nfreeinos) { | |
1849 | IREAD_UNLOCK(imap->im_ipimap); | |
1850 | release_metapage(mp); | |
1851 | jfs_error(ip->i_sb, | |
1852 | "diAllocIno: nfreeinos = 0, but iag on freelist"); | |
1853 | return -EIO; | |
1854 | } | |
1855 | ||
1856 | /* scan the free inode summary map to find an extent | |
1857 | * with free inodes. | |
1858 | */ | |
1859 | for (sword = 0;; sword++) { | |
1860 | if (sword >= SMAPSZ) { | |
1861 | IREAD_UNLOCK(imap->im_ipimap); | |
1862 | release_metapage(mp); | |
1863 | jfs_error(ip->i_sb, | |
1864 | "diAllocIno: free inode not found in summary map"); | |
1865 | return -EIO; | |
1866 | } | |
1867 | ||
1868 | if (~iagp->inosmap[sword]) | |
1869 | break; | |
1870 | } | |
1871 | ||
1872 | /* found a extent with free inodes. determine | |
1873 | * the extent number. | |
1874 | */ | |
1875 | rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0); | |
1876 | if (rem >= EXTSPERSUM) { | |
1877 | IREAD_UNLOCK(imap->im_ipimap); | |
1878 | release_metapage(mp); | |
1879 | jfs_error(ip->i_sb, "diAllocIno: no free extent found"); | |
1880 | return -EIO; | |
1881 | } | |
1882 | extno = (sword << L2EXTSPERSUM) + rem; | |
1883 | ||
1884 | /* find the first free inode in the extent. | |
1885 | */ | |
1886 | rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0); | |
1887 | if (rem >= INOSPEREXT) { | |
1888 | IREAD_UNLOCK(imap->im_ipimap); | |
1889 | release_metapage(mp); | |
1890 | jfs_error(ip->i_sb, "diAllocIno: free inode not found"); | |
1891 | return -EIO; | |
1892 | } | |
1893 | ||
1894 | /* compute the inode number within the iag. | |
1895 | */ | |
1896 | ino = (extno << L2INOSPEREXT) + rem; | |
1897 | ||
1898 | /* allocate the inode. | |
1899 | */ | |
1900 | rc = diAllocBit(imap, iagp, ino); | |
1901 | IREAD_UNLOCK(imap->im_ipimap); | |
1902 | if (rc) { | |
1903 | release_metapage(mp); | |
1904 | return (rc); | |
1905 | } | |
1906 | ||
1907 | /* set the results of the allocation and write the iag. | |
1908 | */ | |
1909 | diInitInode(ip, iagno, ino, extno, iagp); | |
1910 | write_metapage(mp); | |
1911 | ||
1912 | return (0); | |
1913 | } | |
1914 | ||
1915 | ||
1916 | /* | |
1917 | * NAME: diAllocExt(imap,agno,ip) | |
1918 | * | |
1919 | * FUNCTION: add a new extent of free inodes to an iag, allocating | |
1920 | * an inode from this extent to satisfy the current allocation | |
1921 | * request. | |
1922 | * | |
1923 | * this routine first tries to find an existing iag with free | |
1924 | * extents through the ag free extent list. if list is not | |
1925 | * empty, the head of the list will be selected as the home | |
1926 | * of the new extent of free inodes. otherwise (the list is | |
1927 | * empty), a new iag will be allocated for the ag to contain | |
1928 | * the extent. | |
1929 | * | |
1930 | * once an iag has been selected, the free extent summary map | |
1931 | * is used to locate a free extent within the iag and diNewExt() | |
1932 | * is called to initialize the extent, with initialization | |
1933 | * including the allocation of the first inode of the extent | |
1934 | * for the purpose of satisfying this request. | |
1935 | * | |
1936 | * PARAMETERS: | |
1937 | * imap - pointer to inode map control structure. | |
1938 | * agno - allocation group number. | |
1939 | * ip - pointer to new inode to be filled in on successful return | |
1940 | * with the disk inode number allocated, its extent address | |
1941 | * and the start of the ag. | |
1942 | * | |
1943 | * RETURN VALUES: | |
1944 | * 0 - success. | |
1945 | * -ENOSPC - insufficient disk resources. | |
1946 | * -EIO - i/o error. | |
1947 | */ | |
1948 | static int diAllocExt(struct inomap * imap, int agno, struct inode *ip) | |
1949 | { | |
1950 | int rem, iagno, sword, extno, rc; | |
1951 | struct metapage *mp; | |
1952 | struct iag *iagp; | |
1953 | ||
1954 | /* check if the ag has any iags with free extents. if not, | |
1955 | * allocate a new iag for the ag. | |
1956 | */ | |
1957 | if ((iagno = imap->im_agctl[agno].extfree) < 0) { | |
1958 | /* If successful, diNewIAG will obtain the read lock on the | |
1959 | * imap inode. | |
1960 | */ | |
1961 | if ((rc = diNewIAG(imap, &iagno, agno, &mp))) { | |
1962 | return (rc); | |
1963 | } | |
1964 | iagp = (struct iag *) mp->data; | |
1965 | ||
1966 | /* set the ag number if this a brand new iag | |
1967 | */ | |
1968 | iagp->agstart = | |
1969 | cpu_to_le64(AGTOBLK(agno, imap->im_ipimap)); | |
1970 | } else { | |
1971 | /* read the iag. | |
1972 | */ | |
1973 | IREAD_LOCK(imap->im_ipimap); | |
1974 | if ((rc = diIAGRead(imap, iagno, &mp))) { | |
1975 | IREAD_UNLOCK(imap->im_ipimap); | |
1976 | jfs_error(ip->i_sb, "diAllocExt: error reading iag"); | |
1977 | return rc; | |
1978 | } | |
1979 | iagp = (struct iag *) mp->data; | |
1980 | } | |
1981 | ||
1982 | /* using the free extent summary map, find a free extent. | |
1983 | */ | |
1984 | for (sword = 0;; sword++) { | |
1985 | if (sword >= SMAPSZ) { | |
1986 | release_metapage(mp); | |
1987 | IREAD_UNLOCK(imap->im_ipimap); | |
1988 | jfs_error(ip->i_sb, | |
1989 | "diAllocExt: free ext summary map not found"); | |
1990 | return -EIO; | |
1991 | } | |
1992 | if (~iagp->extsmap[sword]) | |
1993 | break; | |
1994 | } | |
1995 | ||
1996 | /* determine the extent number of the free extent. | |
1997 | */ | |
1998 | rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0); | |
1999 | if (rem >= EXTSPERSUM) { | |
2000 | release_metapage(mp); | |
2001 | IREAD_UNLOCK(imap->im_ipimap); | |
2002 | jfs_error(ip->i_sb, "diAllocExt: free extent not found"); | |
2003 | return -EIO; | |
2004 | } | |
2005 | extno = (sword << L2EXTSPERSUM) + rem; | |
2006 | ||
2007 | /* initialize the new extent. | |
2008 | */ | |
2009 | rc = diNewExt(imap, iagp, extno); | |
2010 | IREAD_UNLOCK(imap->im_ipimap); | |
2011 | if (rc) { | |
2012 | /* something bad happened. if a new iag was allocated, | |
2013 | * place it back on the inode map's iag free list, and | |
2014 | * clear the ag number information. | |
2015 | */ | |
2016 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { | |
2017 | IAGFREE_LOCK(imap); | |
2018 | iagp->iagfree = cpu_to_le32(imap->im_freeiag); | |
2019 | imap->im_freeiag = iagno; | |
2020 | IAGFREE_UNLOCK(imap); | |
2021 | } | |
2022 | write_metapage(mp); | |
2023 | return (rc); | |
2024 | } | |
2025 | ||
2026 | /* set the results of the allocation and write the iag. | |
2027 | */ | |
2028 | diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp); | |
2029 | ||
2030 | write_metapage(mp); | |
2031 | ||
2032 | return (0); | |
2033 | } | |
2034 | ||
2035 | ||
2036 | /* | |
2037 | * NAME: diAllocBit(imap,iagp,ino) | |
2038 | * | |
2039 | * FUNCTION: allocate a backed inode from an iag. | |
2040 | * | |
2041 | * this routine performs the mechanics of allocating a | |
2042 | * specified inode from a backed extent. | |
2043 | * | |
2044 | * if the inode to be allocated represents the last free | |
2045 | * inode within the iag, the iag will be removed from the | |
2046 | * ag free inode list. | |
2047 | * | |
2048 | * a careful update approach is used to provide consistency | |
2049 | * in the face of updates to multiple buffers. under this | |
2050 | * approach, all required buffers are obtained before making | |
2051 | * any updates and are held all are updates are complete. | |
2052 | * | |
2053 | * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on | |
2054 | * this AG. Must have read lock on imap inode. | |
2055 | * | |
2056 | * PARAMETERS: | |
2057 | * imap - pointer to inode map control structure. | |
2058 | * iagp - pointer to iag. | |
2059 | * ino - inode number to be allocated within the iag. | |
2060 | * | |
2061 | * RETURN VALUES: | |
2062 | * 0 - success. | |
2063 | * -ENOSPC - insufficient disk resources. | |
2064 | * -EIO - i/o error. | |
2065 | */ | |
2066 | static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino) | |
2067 | { | |
2068 | int extno, bitno, agno, sword, rc; | |
2069 | struct metapage *amp = NULL, *bmp = NULL; | |
2070 | struct iag *aiagp = NULL, *biagp = NULL; | |
2071 | u32 mask; | |
2072 | ||
2073 | /* check if this is the last free inode within the iag. | |
2074 | * if so, it will have to be removed from the ag free | |
2075 | * inode list, so get the iags preceeding and following | |
2076 | * it on the list. | |
2077 | */ | |
2078 | if (iagp->nfreeinos == cpu_to_le32(1)) { | |
2079 | if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) { | |
2080 | if ((rc = | |
2081 | diIAGRead(imap, le32_to_cpu(iagp->inofreefwd), | |
2082 | &))) | |
2083 | return (rc); | |
2084 | aiagp = (struct iag *) amp->data; | |
2085 | } | |
2086 | ||
2087 | if ((int) le32_to_cpu(iagp->inofreeback) >= 0) { | |
2088 | if ((rc = | |
2089 | diIAGRead(imap, | |
2090 | le32_to_cpu(iagp->inofreeback), | |
2091 | &bmp))) { | |
2092 | if (amp) | |
2093 | release_metapage(amp); | |
2094 | return (rc); | |
2095 | } | |
2096 | biagp = (struct iag *) bmp->data; | |
2097 | } | |
2098 | } | |
2099 | ||
2100 | /* get the ag number, extent number, inode number within | |
2101 | * the extent. | |
2102 | */ | |
2103 | agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb)); | |
2104 | extno = ino >> L2INOSPEREXT; | |
2105 | bitno = ino & (INOSPEREXT - 1); | |
2106 | ||
2107 | /* compute the mask for setting the map. | |
2108 | */ | |
2109 | mask = HIGHORDER >> bitno; | |
2110 | ||
2111 | /* the inode should be free and backed. | |
2112 | */ | |
2113 | if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) || | |
2114 | ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) || | |
2115 | (addressPXD(&iagp->inoext[extno]) == 0)) { | |
2116 | if (amp) | |
2117 | release_metapage(amp); | |
2118 | if (bmp) | |
2119 | release_metapage(bmp); | |
2120 | ||
2121 | jfs_error(imap->im_ipimap->i_sb, | |
2122 | "diAllocBit: iag inconsistent"); | |
2123 | return -EIO; | |
2124 | } | |
2125 | ||
2126 | /* mark the inode as allocated in the working map. | |
2127 | */ | |
2128 | iagp->wmap[extno] |= cpu_to_le32(mask); | |
2129 | ||
2130 | /* check if all inodes within the extent are now | |
2131 | * allocated. if so, update the free inode summary | |
2132 | * map to reflect this. | |
2133 | */ | |
2134 | if (iagp->wmap[extno] == cpu_to_le32(ONES)) { | |
2135 | sword = extno >> L2EXTSPERSUM; | |
2136 | bitno = extno & (EXTSPERSUM - 1); | |
2137 | iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno); | |
2138 | } | |
2139 | ||
2140 | /* if this was the last free inode in the iag, remove the | |
2141 | * iag from the ag free inode list. | |
2142 | */ | |
2143 | if (iagp->nfreeinos == cpu_to_le32(1)) { | |
2144 | if (amp) { | |
2145 | aiagp->inofreeback = iagp->inofreeback; | |
2146 | write_metapage(amp); | |
2147 | } | |
2148 | ||
2149 | if (bmp) { | |
2150 | biagp->inofreefwd = iagp->inofreefwd; | |
2151 | write_metapage(bmp); | |
2152 | } else { | |
2153 | imap->im_agctl[agno].inofree = | |
2154 | le32_to_cpu(iagp->inofreefwd); | |
2155 | } | |
2156 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); | |
2157 | } | |
2158 | ||
2159 | /* update the free inode count at the iag, ag, inode | |
2160 | * map levels. | |
2161 | */ | |
2162 | iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) - 1); | |
2163 | imap->im_agctl[agno].numfree -= 1; | |
2164 | atomic_dec(&imap->im_numfree); | |
2165 | ||
2166 | return (0); | |
2167 | } | |
2168 | ||
2169 | ||
2170 | /* | |
2171 | * NAME: diNewExt(imap,iagp,extno) | |
2172 | * | |
2173 | * FUNCTION: initialize a new extent of inodes for an iag, allocating | |
2174 | * the first inode of the extent for use for the current | |
2175 | * allocation request. | |
2176 | * | |
2177 | * disk resources are allocated for the new extent of inodes | |
2178 | * and the inodes themselves are initialized to reflect their | |
2179 | * existence within the extent (i.e. their inode numbers and | |
2180 | * inode extent addresses are set) and their initial state | |
2181 | * (mode and link count are set to zero). | |
2182 | * | |
2183 | * if the iag is new, it is not yet on an ag extent free list | |
2184 | * but will now be placed on this list. | |
2185 | * | |
2186 | * if the allocation of the new extent causes the iag to | |
2187 | * have no free extent, the iag will be removed from the | |
2188 | * ag extent free list. | |
2189 | * | |
2190 | * if the iag has no free backed inodes, it will be placed | |
2191 | * on the ag free inode list, since the addition of the new | |
2192 | * extent will now cause it to have free inodes. | |
2193 | * | |
2194 | * a careful update approach is used to provide consistency | |
2195 | * (i.e. list consistency) in the face of updates to multiple | |
2196 | * buffers. under this approach, all required buffers are | |
2197 | * obtained before making any updates and are held until all | |
2198 | * updates are complete. | |
2199 | * | |
2200 | * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on | |
2201 | * this AG. Must have read lock on imap inode. | |
2202 | * | |
2203 | * PARAMETERS: | |
2204 | * imap - pointer to inode map control structure. | |
2205 | * iagp - pointer to iag. | |
2206 | * extno - extent number. | |
2207 | * | |
2208 | * RETURN VALUES: | |
2209 | * 0 - success. | |
2210 | * -ENOSPC - insufficient disk resources. | |
2211 | * -EIO - i/o error. | |
2212 | */ | |
2213 | static int diNewExt(struct inomap * imap, struct iag * iagp, int extno) | |
2214 | { | |
2215 | int agno, iagno, fwd, back, freei = 0, sword, rc; | |
2216 | struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL; | |
2217 | struct metapage *amp, *bmp, *cmp, *dmp; | |
2218 | struct inode *ipimap; | |
2219 | s64 blkno, hint; | |
2220 | int i, j; | |
2221 | u32 mask; | |
2222 | ino_t ino; | |
2223 | struct dinode *dp; | |
2224 | struct jfs_sb_info *sbi; | |
2225 | ||
2226 | /* better have free extents. | |
2227 | */ | |
2228 | if (!iagp->nfreeexts) { | |
2229 | jfs_error(imap->im_ipimap->i_sb, "diNewExt: no free extents"); | |
2230 | return -EIO; | |
2231 | } | |
2232 | ||
2233 | /* get the inode map inode. | |
2234 | */ | |
2235 | ipimap = imap->im_ipimap; | |
2236 | sbi = JFS_SBI(ipimap->i_sb); | |
2237 | ||
2238 | amp = bmp = cmp = NULL; | |
2239 | ||
2240 | /* get the ag and iag numbers for this iag. | |
2241 | */ | |
2242 | agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); | |
2243 | iagno = le32_to_cpu(iagp->iagnum); | |
2244 | ||
2245 | /* check if this is the last free extent within the | |
2246 | * iag. if so, the iag must be removed from the ag | |
2247 | * free extent list, so get the iags preceeding and | |
2248 | * following the iag on this list. | |
2249 | */ | |
2250 | if (iagp->nfreeexts == cpu_to_le32(1)) { | |
2251 | if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { | |
2252 | if ((rc = diIAGRead(imap, fwd, &))) | |
2253 | return (rc); | |
2254 | aiagp = (struct iag *) amp->data; | |
2255 | } | |
2256 | ||
2257 | if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { | |
2258 | if ((rc = diIAGRead(imap, back, &bmp))) | |
2259 | goto error_out; | |
2260 | biagp = (struct iag *) bmp->data; | |
2261 | } | |
2262 | } else { | |
2263 | /* the iag has free extents. if all extents are free | |
2264 | * (as is the case for a newly allocated iag), the iag | |
2265 | * must be added to the ag free extent list, so get | |
2266 | * the iag at the head of the list in preparation for | |
2267 | * adding this iag to this list. | |
2268 | */ | |
2269 | fwd = back = -1; | |
2270 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { | |
2271 | if ((fwd = imap->im_agctl[agno].extfree) >= 0) { | |
2272 | if ((rc = diIAGRead(imap, fwd, &))) | |
2273 | goto error_out; | |
2274 | aiagp = (struct iag *) amp->data; | |
2275 | } | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | /* check if the iag has no free inodes. if so, the iag | |
2280 | * will have to be added to the ag free inode list, so get | |
2281 | * the iag at the head of the list in preparation for | |
2282 | * adding this iag to this list. in doing this, we must | |
2283 | * check if we already have the iag at the head of | |
2284 | * the list in hand. | |
2285 | */ | |
2286 | if (iagp->nfreeinos == 0) { | |
2287 | freei = imap->im_agctl[agno].inofree; | |
2288 | ||
2289 | if (freei >= 0) { | |
2290 | if (freei == fwd) { | |
2291 | ciagp = aiagp; | |
2292 | } else if (freei == back) { | |
2293 | ciagp = biagp; | |
2294 | } else { | |
2295 | if ((rc = diIAGRead(imap, freei, &cmp))) | |
2296 | goto error_out; | |
2297 | ciagp = (struct iag *) cmp->data; | |
2298 | } | |
2299 | if (ciagp == NULL) { | |
2300 | jfs_error(imap->im_ipimap->i_sb, | |
2301 | "diNewExt: ciagp == NULL"); | |
2302 | rc = -EIO; | |
2303 | goto error_out; | |
2304 | } | |
2305 | } | |
2306 | } | |
2307 | ||
2308 | /* allocate disk space for the inode extent. | |
2309 | */ | |
2310 | if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0)) | |
2311 | hint = ((s64) agno << sbi->bmap->db_agl2size) - 1; | |
2312 | else | |
2313 | hint = addressPXD(&iagp->inoext[extno - 1]) + | |
2314 | lengthPXD(&iagp->inoext[extno - 1]) - 1; | |
2315 | ||
2316 | if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno))) | |
2317 | goto error_out; | |
2318 | ||
2319 | /* compute the inode number of the first inode within the | |
2320 | * extent. | |
2321 | */ | |
2322 | ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT); | |
2323 | ||
2324 | /* initialize the inodes within the newly allocated extent a | |
2325 | * page at a time. | |
2326 | */ | |
2327 | for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) { | |
2328 | /* get a buffer for this page of disk inodes. | |
2329 | */ | |
2330 | dmp = get_metapage(ipimap, blkno + i, PSIZE, 1); | |
2331 | if (dmp == NULL) { | |
2332 | rc = -EIO; | |
2333 | goto error_out; | |
2334 | } | |
2335 | dp = (struct dinode *) dmp->data; | |
2336 | ||
2337 | /* initialize the inode number, mode, link count and | |
2338 | * inode extent address. | |
2339 | */ | |
2340 | for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) { | |
2341 | dp->di_inostamp = cpu_to_le32(sbi->inostamp); | |
2342 | dp->di_number = cpu_to_le32(ino); | |
2343 | dp->di_fileset = cpu_to_le32(FILESYSTEM_I); | |
2344 | dp->di_mode = 0; | |
2345 | dp->di_nlink = 0; | |
2346 | PXDaddress(&(dp->di_ixpxd), blkno); | |
2347 | PXDlength(&(dp->di_ixpxd), imap->im_nbperiext); | |
2348 | } | |
2349 | write_metapage(dmp); | |
2350 | } | |
2351 | ||
2352 | /* if this is the last free extent within the iag, remove the | |
2353 | * iag from the ag free extent list. | |
2354 | */ | |
2355 | if (iagp->nfreeexts == cpu_to_le32(1)) { | |
2356 | if (fwd >= 0) | |
2357 | aiagp->extfreeback = iagp->extfreeback; | |
2358 | ||
2359 | if (back >= 0) | |
2360 | biagp->extfreefwd = iagp->extfreefwd; | |
2361 | else | |
2362 | imap->im_agctl[agno].extfree = | |
2363 | le32_to_cpu(iagp->extfreefwd); | |
2364 | ||
2365 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); | |
2366 | } else { | |
2367 | /* if the iag has all free extents (newly allocated iag), | |
2368 | * add the iag to the ag free extent list. | |
2369 | */ | |
2370 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { | |
2371 | if (fwd >= 0) | |
2372 | aiagp->extfreeback = cpu_to_le32(iagno); | |
2373 | ||
2374 | iagp->extfreefwd = cpu_to_le32(fwd); | |
2375 | iagp->extfreeback = cpu_to_le32(-1); | |
2376 | imap->im_agctl[agno].extfree = iagno; | |
2377 | } | |
2378 | } | |
2379 | ||
2380 | /* if the iag has no free inodes, add the iag to the | |
2381 | * ag free inode list. | |
2382 | */ | |
2383 | if (iagp->nfreeinos == 0) { | |
2384 | if (freei >= 0) | |
2385 | ciagp->inofreeback = cpu_to_le32(iagno); | |
2386 | ||
2387 | iagp->inofreefwd = | |
2388 | cpu_to_le32(imap->im_agctl[agno].inofree); | |
2389 | iagp->inofreeback = cpu_to_le32(-1); | |
2390 | imap->im_agctl[agno].inofree = iagno; | |
2391 | } | |
2392 | ||
2393 | /* initialize the extent descriptor of the extent. */ | |
2394 | PXDlength(&iagp->inoext[extno], imap->im_nbperiext); | |
2395 | PXDaddress(&iagp->inoext[extno], blkno); | |
2396 | ||
2397 | /* initialize the working and persistent map of the extent. | |
2398 | * the working map will be initialized such that | |
2399 | * it indicates the first inode of the extent is allocated. | |
2400 | */ | |
2401 | iagp->wmap[extno] = cpu_to_le32(HIGHORDER); | |
2402 | iagp->pmap[extno] = 0; | |
2403 | ||
2404 | /* update the free inode and free extent summary maps | |
2405 | * for the extent to indicate the extent has free inodes | |
2406 | * and no longer represents a free extent. | |
2407 | */ | |
2408 | sword = extno >> L2EXTSPERSUM; | |
2409 | mask = HIGHORDER >> (extno & (EXTSPERSUM - 1)); | |
2410 | iagp->extsmap[sword] |= cpu_to_le32(mask); | |
2411 | iagp->inosmap[sword] &= cpu_to_le32(~mask); | |
2412 | ||
2413 | /* update the free inode and free extent counts for the | |
2414 | * iag. | |
2415 | */ | |
2416 | iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) + | |
2417 | (INOSPEREXT - 1)); | |
2418 | iagp->nfreeexts = cpu_to_le32(le32_to_cpu(iagp->nfreeexts) - 1); | |
2419 | ||
2420 | /* update the free and backed inode counts for the ag. | |
2421 | */ | |
2422 | imap->im_agctl[agno].numfree += (INOSPEREXT - 1); | |
2423 | imap->im_agctl[agno].numinos += INOSPEREXT; | |
2424 | ||
2425 | /* update the free and backed inode counts for the inode map. | |
2426 | */ | |
2427 | atomic_add(INOSPEREXT - 1, &imap->im_numfree); | |
2428 | atomic_add(INOSPEREXT, &imap->im_numinos); | |
2429 | ||
2430 | /* write the iags. | |
2431 | */ | |
2432 | if (amp) | |
2433 | write_metapage(amp); | |
2434 | if (bmp) | |
2435 | write_metapage(bmp); | |
2436 | if (cmp) | |
2437 | write_metapage(cmp); | |
2438 | ||
2439 | return (0); | |
2440 | ||
2441 | error_out: | |
2442 | ||
2443 | /* release the iags. | |
2444 | */ | |
2445 | if (amp) | |
2446 | release_metapage(amp); | |
2447 | if (bmp) | |
2448 | release_metapage(bmp); | |
2449 | if (cmp) | |
2450 | release_metapage(cmp); | |
2451 | ||
2452 | return (rc); | |
2453 | } | |
2454 | ||
2455 | ||
2456 | /* | |
2457 | * NAME: diNewIAG(imap,iagnop,agno) | |
2458 | * | |
2459 | * FUNCTION: allocate a new iag for an allocation group. | |
2460 | * | |
2461 | * first tries to allocate the iag from the inode map | |
2462 | * iagfree list: | |
2463 | * if the list has free iags, the head of the list is removed | |
2464 | * and returned to satisfy the request. | |
2465 | * if the inode map's iag free list is empty, the inode map | |
2466 | * is extended to hold a new iag. this new iag is initialized | |
2467 | * and returned to satisfy the request. | |
2468 | * | |
2469 | * PARAMETERS: | |
2470 | * imap - pointer to inode map control structure. | |
2471 | * iagnop - pointer to an iag number set with the number of the | |
2472 | * newly allocated iag upon successful return. | |
2473 | * agno - allocation group number. | |
2474 | * bpp - Buffer pointer to be filled in with new IAG's buffer | |
2475 | * | |
2476 | * RETURN VALUES: | |
2477 | * 0 - success. | |
2478 | * -ENOSPC - insufficient disk resources. | |
2479 | * -EIO - i/o error. | |
2480 | * | |
2481 | * serialization: | |
2482 | * AG lock held on entry/exit; | |
2483 | * write lock on the map is held inside; | |
2484 | * read lock on the map is held on successful completion; | |
2485 | * | |
2486 | * note: new iag transaction: | |
2487 | * . synchronously write iag; | |
2488 | * . write log of xtree and inode of imap; | |
2489 | * . commit; | |
2490 | * . synchronous write of xtree (right to left, bottom to top); | |
2491 | * . at start of logredo(): init in-memory imap with one additional iag page; | |
2492 | * . at end of logredo(): re-read imap inode to determine | |
2493 | * new imap size; | |
2494 | */ | |
2495 | static int | |
2496 | diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) | |
2497 | { | |
2498 | int rc; | |
2499 | int iagno, i, xlen; | |
2500 | struct inode *ipimap; | |
2501 | struct super_block *sb; | |
2502 | struct jfs_sb_info *sbi; | |
2503 | struct metapage *mp; | |
2504 | struct iag *iagp; | |
2505 | s64 xaddr = 0; | |
2506 | s64 blkno; | |
2507 | tid_t tid; | |
2508 | #ifdef _STILL_TO_PORT | |
2509 | xad_t xad; | |
2510 | #endif /* _STILL_TO_PORT */ | |
2511 | struct inode *iplist[1]; | |
2512 | ||
2513 | /* pick up pointers to the inode map and mount inodes */ | |
2514 | ipimap = imap->im_ipimap; | |
2515 | sb = ipimap->i_sb; | |
2516 | sbi = JFS_SBI(sb); | |
2517 | ||
2518 | /* acquire the free iag lock */ | |
2519 | IAGFREE_LOCK(imap); | |
2520 | ||
2521 | /* if there are any iags on the inode map free iag list, | |
2522 | * allocate the iag from the head of the list. | |
2523 | */ | |
2524 | if (imap->im_freeiag >= 0) { | |
2525 | /* pick up the iag number at the head of the list */ | |
2526 | iagno = imap->im_freeiag; | |
2527 | ||
2528 | /* determine the logical block number of the iag */ | |
2529 | blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); | |
2530 | } else { | |
2531 | /* no free iags. the inode map will have to be extented | |
2532 | * to include a new iag. | |
2533 | */ | |
2534 | ||
2535 | /* acquire inode map lock */ | |
2536 | IWRITE_LOCK(ipimap); | |
2537 | ||
2538 | if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) { | |
2539 | IWRITE_UNLOCK(ipimap); | |
2540 | IAGFREE_UNLOCK(imap); | |
2541 | jfs_error(imap->im_ipimap->i_sb, | |
2542 | "diNewIAG: ipimap->i_size is wrong"); | |
2543 | return -EIO; | |
2544 | } | |
2545 | ||
2546 | ||
2547 | /* get the next avaliable iag number */ | |
2548 | iagno = imap->im_nextiag; | |
2549 | ||
2550 | /* make sure that we have not exceeded the maximum inode | |
2551 | * number limit. | |
2552 | */ | |
2553 | if (iagno > (MAXIAGS - 1)) { | |
2554 | /* release the inode map lock */ | |
2555 | IWRITE_UNLOCK(ipimap); | |
2556 | ||
2557 | rc = -ENOSPC; | |
2558 | goto out; | |
2559 | } | |
2560 | ||
2561 | /* | |
2562 | * synchronously append new iag page. | |
2563 | */ | |
2564 | /* determine the logical address of iag page to append */ | |
2565 | blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); | |
2566 | ||
2567 | /* Allocate extent for new iag page */ | |
2568 | xlen = sbi->nbperpage; | |
2569 | if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) { | |
2570 | /* release the inode map lock */ | |
2571 | IWRITE_UNLOCK(ipimap); | |
2572 | ||
2573 | goto out; | |
2574 | } | |
2575 | ||
d2e83707 DK |
2576 | /* |
2577 | * start transaction of update of the inode map | |
2578 | * addressing structure pointing to the new iag page; | |
2579 | */ | |
2580 | tid = txBegin(sb, COMMIT_FORCE); | |
2581 | down(&JFS_IP(ipimap)->commit_sem); | |
2582 | ||
2583 | /* update the inode map addressing structure to point to it */ | |
2584 | if ((rc = | |
2585 | xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) { | |
2586 | txEnd(tid); | |
2587 | up(&JFS_IP(ipimap)->commit_sem); | |
1da177e4 LT |
2588 | /* Free the blocks allocated for the iag since it was |
2589 | * not successfully added to the inode map | |
2590 | */ | |
2591 | dbFree(ipimap, xaddr, (s64) xlen); | |
2592 | ||
2593 | /* release the inode map lock */ | |
2594 | IWRITE_UNLOCK(ipimap); | |
2595 | ||
d2e83707 DK |
2596 | goto out; |
2597 | } | |
2598 | ||
2599 | /* update the inode map's inode to reflect the extension */ | |
2600 | ipimap->i_size += PSIZE; | |
2601 | inode_add_bytes(ipimap, PSIZE); | |
2602 | ||
2603 | /* assign a buffer for the page */ | |
2604 | mp = get_metapage(ipimap, blkno, PSIZE, 0); | |
2605 | if (!mp) { | |
2606 | /* | |
2607 | * This is very unlikely since we just created the | |
2608 | * extent, but let's try to handle it correctly | |
2609 | */ | |
2610 | xtTruncate(tid, ipimap, ipimap->i_size - PSIZE, | |
2611 | COMMIT_PWMAP); | |
2612 | ||
2613 | txAbort(tid, 0); | |
2614 | txEnd(tid); | |
2615 | ||
2616 | /* release the inode map lock */ | |
2617 | IWRITE_UNLOCK(ipimap); | |
2618 | ||
1da177e4 LT |
2619 | rc = -EIO; |
2620 | goto out; | |
2621 | } | |
2622 | iagp = (struct iag *) mp->data; | |
2623 | ||
2624 | /* init the iag */ | |
2625 | memset(iagp, 0, sizeof(struct iag)); | |
2626 | iagp->iagnum = cpu_to_le32(iagno); | |
2627 | iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); | |
2628 | iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); | |
2629 | iagp->iagfree = cpu_to_le32(-1); | |
2630 | iagp->nfreeinos = 0; | |
2631 | iagp->nfreeexts = cpu_to_le32(EXTSPERIAG); | |
2632 | ||
2633 | /* initialize the free inode summary map (free extent | |
2634 | * summary map initialization handled by bzero). | |
2635 | */ | |
2636 | for (i = 0; i < SMAPSZ; i++) | |
2637 | iagp->inosmap[i] = cpu_to_le32(ONES); | |
2638 | ||
2639 | /* | |
d2e83707 | 2640 | * Write and sync the metapage |
1da177e4 | 2641 | */ |
1da177e4 LT |
2642 | flush_metapage(mp); |
2643 | ||
1da177e4 LT |
2644 | /* |
2645 | * txCommit(COMMIT_FORCE) will synchronously write address | |
2646 | * index pages and inode after commit in careful update order | |
2647 | * of address index pages (right to left, bottom up); | |
2648 | */ | |
2649 | iplist[0] = ipimap; | |
2650 | rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); | |
2651 | ||
2652 | txEnd(tid); | |
2653 | up(&JFS_IP(ipimap)->commit_sem); | |
2654 | ||
2655 | duplicateIXtree(sb, blkno, xlen, &xaddr); | |
2656 | ||
2657 | /* update the next avaliable iag number */ | |
2658 | imap->im_nextiag += 1; | |
2659 | ||
2660 | /* Add the iag to the iag free list so we don't lose the iag | |
2661 | * if a failure happens now. | |
2662 | */ | |
2663 | imap->im_freeiag = iagno; | |
2664 | ||
2665 | /* Until we have logredo working, we want the imap inode & | |
2666 | * control page to be up to date. | |
2667 | */ | |
2668 | diSync(ipimap); | |
2669 | ||
2670 | /* release the inode map lock */ | |
2671 | IWRITE_UNLOCK(ipimap); | |
2672 | } | |
2673 | ||
2674 | /* obtain read lock on map */ | |
2675 | IREAD_LOCK(ipimap); | |
2676 | ||
2677 | /* read the iag */ | |
2678 | if ((rc = diIAGRead(imap, iagno, &mp))) { | |
2679 | IREAD_UNLOCK(ipimap); | |
2680 | rc = -EIO; | |
2681 | goto out; | |
2682 | } | |
2683 | iagp = (struct iag *) mp->data; | |
2684 | ||
2685 | /* remove the iag from the iag free list */ | |
2686 | imap->im_freeiag = le32_to_cpu(iagp->iagfree); | |
2687 | iagp->iagfree = cpu_to_le32(-1); | |
2688 | ||
2689 | /* set the return iag number and buffer pointer */ | |
2690 | *iagnop = iagno; | |
2691 | *mpp = mp; | |
2692 | ||
2693 | out: | |
2694 | /* release the iag free lock */ | |
2695 | IAGFREE_UNLOCK(imap); | |
2696 | ||
2697 | return (rc); | |
2698 | } | |
2699 | ||
2700 | /* | |
2701 | * NAME: diIAGRead() | |
2702 | * | |
2703 | * FUNCTION: get the buffer for the specified iag within a fileset | |
2704 | * or aggregate inode map. | |
2705 | * | |
2706 | * PARAMETERS: | |
2707 | * imap - pointer to inode map control structure. | |
2708 | * iagno - iag number. | |
2709 | * bpp - point to buffer pointer to be filled in on successful | |
2710 | * exit. | |
2711 | * | |
2712 | * SERIALIZATION: | |
2713 | * must have read lock on imap inode | |
2714 | * (When called by diExtendFS, the filesystem is quiesced, therefore | |
2715 | * the read lock is unnecessary.) | |
2716 | * | |
2717 | * RETURN VALUES: | |
2718 | * 0 - success. | |
2719 | * -EIO - i/o error. | |
2720 | */ | |
2721 | static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp) | |
2722 | { | |
2723 | struct inode *ipimap = imap->im_ipimap; | |
2724 | s64 blkno; | |
2725 | ||
2726 | /* compute the logical block number of the iag. */ | |
2727 | blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage); | |
2728 | ||
2729 | /* read the iag. */ | |
2730 | *mpp = read_metapage(ipimap, blkno, PSIZE, 0); | |
2731 | if (*mpp == NULL) { | |
2732 | return -EIO; | |
2733 | } | |
2734 | ||
2735 | return (0); | |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * NAME: diFindFree() | |
2740 | * | |
2741 | * FUNCTION: find the first free bit in a word starting at | |
2742 | * the specified bit position. | |
2743 | * | |
2744 | * PARAMETERS: | |
2745 | * word - word to be examined. | |
2746 | * start - starting bit position. | |
2747 | * | |
2748 | * RETURN VALUES: | |
2749 | * bit position of first free bit in the word or 32 if | |
2750 | * no free bits were found. | |
2751 | */ | |
2752 | static int diFindFree(u32 word, int start) | |
2753 | { | |
2754 | int bitno; | |
2755 | assert(start < 32); | |
2756 | /* scan the word for the first free bit. */ | |
2757 | for (word <<= start, bitno = start; bitno < 32; | |
2758 | bitno++, word <<= 1) { | |
2759 | if ((word & HIGHORDER) == 0) | |
2760 | break; | |
2761 | } | |
2762 | return (bitno); | |
2763 | } | |
2764 | ||
2765 | /* | |
2766 | * NAME: diUpdatePMap() | |
2767 | * | |
2768 | * FUNCTION: Update the persistent map in an IAG for the allocation or | |
2769 | * freeing of the specified inode. | |
2770 | * | |
2771 | * PRE CONDITIONS: Working map has already been updated for allocate. | |
2772 | * | |
2773 | * PARAMETERS: | |
2774 | * ipimap - Incore inode map inode | |
2775 | * inum - Number of inode to mark in permanent map | |
2776 | * is_free - If TRUE indicates inode should be marked freed, otherwise | |
2777 | * indicates inode should be marked allocated. | |
2778 | * | |
2779 | * RETURN VALUES: | |
2780 | * 0 for success | |
2781 | */ | |
2782 | int | |
2783 | diUpdatePMap(struct inode *ipimap, | |
2784 | unsigned long inum, boolean_t is_free, struct tblock * tblk) | |
2785 | { | |
2786 | int rc; | |
2787 | struct iag *iagp; | |
2788 | struct metapage *mp; | |
2789 | int iagno, ino, extno, bitno; | |
2790 | struct inomap *imap; | |
2791 | u32 mask; | |
2792 | struct jfs_log *log; | |
2793 | int lsn, difft, diffp; | |
7fab479b | 2794 | unsigned long flags; |
1da177e4 LT |
2795 | |
2796 | imap = JFS_IP(ipimap)->i_imap; | |
2797 | /* get the iag number containing the inode */ | |
2798 | iagno = INOTOIAG(inum); | |
2799 | /* make sure that the iag is contained within the map */ | |
2800 | if (iagno >= imap->im_nextiag) { | |
2801 | jfs_error(ipimap->i_sb, | |
2802 | "diUpdatePMap: the iag is outside the map"); | |
2803 | return -EIO; | |
2804 | } | |
2805 | /* read the iag */ | |
2806 | IREAD_LOCK(ipimap); | |
2807 | rc = diIAGRead(imap, iagno, &mp); | |
2808 | IREAD_UNLOCK(ipimap); | |
2809 | if (rc) | |
2810 | return (rc); | |
7fab479b | 2811 | metapage_wait_for_io(mp); |
1da177e4 LT |
2812 | iagp = (struct iag *) mp->data; |
2813 | /* get the inode number and extent number of the inode within | |
2814 | * the iag and the inode number within the extent. | |
2815 | */ | |
2816 | ino = inum & (INOSPERIAG - 1); | |
2817 | extno = ino >> L2INOSPEREXT; | |
2818 | bitno = ino & (INOSPEREXT - 1); | |
2819 | mask = HIGHORDER >> bitno; | |
2820 | /* | |
2821 | * mark the inode free in persistent map: | |
2822 | */ | |
2823 | if (is_free == TRUE) { | |
2824 | /* The inode should have been allocated both in working | |
2825 | * map and in persistent map; | |
2826 | * the inode will be freed from working map at the release | |
2827 | * of last reference release; | |
2828 | */ | |
2829 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { | |
2830 | jfs_error(ipimap->i_sb, | |
2831 | "diUpdatePMap: inode %ld not marked as " | |
2832 | "allocated in wmap!", inum); | |
2833 | } | |
2834 | if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) { | |
2835 | jfs_error(ipimap->i_sb, | |
2836 | "diUpdatePMap: inode %ld not marked as " | |
2837 | "allocated in pmap!", inum); | |
2838 | } | |
2839 | /* update the bitmap for the extent of the freed inode */ | |
2840 | iagp->pmap[extno] &= cpu_to_le32(~mask); | |
2841 | } | |
2842 | /* | |
2843 | * mark the inode allocated in persistent map: | |
2844 | */ | |
2845 | else { | |
2846 | /* The inode should be already allocated in the working map | |
2847 | * and should be free in persistent map; | |
2848 | */ | |
2849 | if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { | |
2850 | release_metapage(mp); | |
2851 | jfs_error(ipimap->i_sb, | |
2852 | "diUpdatePMap: the inode is not allocated in " | |
2853 | "the working map"); | |
2854 | return -EIO; | |
2855 | } | |
2856 | if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) { | |
2857 | release_metapage(mp); | |
2858 | jfs_error(ipimap->i_sb, | |
2859 | "diUpdatePMap: the inode is not free in the " | |
2860 | "persistent map"); | |
2861 | return -EIO; | |
2862 | } | |
2863 | /* update the bitmap for the extent of the allocated inode */ | |
2864 | iagp->pmap[extno] |= cpu_to_le32(mask); | |
2865 | } | |
2866 | /* | |
2867 | * update iag lsn | |
2868 | */ | |
2869 | lsn = tblk->lsn; | |
2870 | log = JFS_SBI(tblk->sb)->log; | |
2871 | if (mp->lsn != 0) { | |
2872 | /* inherit older/smaller lsn */ | |
2873 | logdiff(difft, lsn, log); | |
2874 | logdiff(diffp, mp->lsn, log); | |
7fab479b | 2875 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
2876 | if (difft < diffp) { |
2877 | mp->lsn = lsn; | |
2878 | /* move mp after tblock in logsync list */ | |
1da177e4 | 2879 | list_move(&mp->synclist, &tblk->synclist); |
1da177e4 LT |
2880 | } |
2881 | /* inherit younger/larger clsn */ | |
1da177e4 LT |
2882 | assert(mp->clsn); |
2883 | logdiff(difft, tblk->clsn, log); | |
2884 | logdiff(diffp, mp->clsn, log); | |
2885 | if (difft > diffp) | |
2886 | mp->clsn = tblk->clsn; | |
7fab479b | 2887 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
2888 | } else { |
2889 | mp->log = log; | |
2890 | mp->lsn = lsn; | |
2891 | /* insert mp after tblock in logsync list */ | |
7fab479b | 2892 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
2893 | log->count++; |
2894 | list_add(&mp->synclist, &tblk->synclist); | |
2895 | mp->clsn = tblk->clsn; | |
7fab479b | 2896 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
2897 | } |
2898 | write_metapage(mp); | |
2899 | return (0); | |
2900 | } | |
2901 | ||
2902 | /* | |
2903 | * diExtendFS() | |
2904 | * | |
2905 | * function: update imap for extendfs(); | |
2906 | * | |
2907 | * note: AG size has been increased s.t. each k old contiguous AGs are | |
2908 | * coalesced into a new AG; | |
2909 | */ | |
2910 | int diExtendFS(struct inode *ipimap, struct inode *ipbmap) | |
2911 | { | |
2912 | int rc, rcx = 0; | |
2913 | struct inomap *imap = JFS_IP(ipimap)->i_imap; | |
2914 | struct iag *iagp = NULL, *hiagp = NULL; | |
2915 | struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap; | |
2916 | struct metapage *bp, *hbp; | |
2917 | int i, n, head; | |
2918 | int numinos, xnuminos = 0, xnumfree = 0; | |
2919 | s64 agstart; | |
2920 | ||
2921 | jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d", | |
2922 | imap->im_nextiag, atomic_read(&imap->im_numinos), | |
2923 | atomic_read(&imap->im_numfree)); | |
2924 | ||
2925 | /* | |
2926 | * reconstruct imap | |
2927 | * | |
2928 | * coalesce contiguous k (newAGSize/oldAGSize) AGs; | |
2929 | * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn; | |
2930 | * note: new AG size = old AG size * (2**x). | |
2931 | */ | |
2932 | ||
2933 | /* init per AG control information im_agctl[] */ | |
2934 | for (i = 0; i < MAXAG; i++) { | |
2935 | imap->im_agctl[i].inofree = -1; | |
2936 | imap->im_agctl[i].extfree = -1; | |
2937 | imap->im_agctl[i].numinos = 0; /* number of backed inodes */ | |
2938 | imap->im_agctl[i].numfree = 0; /* number of free backed inodes */ | |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * process each iag page of the map. | |
2943 | * | |
2944 | * rebuild AG Free Inode List, AG Free Inode Extent List; | |
2945 | */ | |
2946 | for (i = 0; i < imap->im_nextiag; i++) { | |
2947 | if ((rc = diIAGRead(imap, i, &bp))) { | |
2948 | rcx = rc; | |
2949 | continue; | |
2950 | } | |
2951 | iagp = (struct iag *) bp->data; | |
2952 | if (le32_to_cpu(iagp->iagnum) != i) { | |
2953 | release_metapage(bp); | |
2954 | jfs_error(ipimap->i_sb, | |
2955 | "diExtendFs: unexpected value of iagnum"); | |
2956 | return -EIO; | |
2957 | } | |
2958 | ||
2959 | /* leave free iag in the free iag list */ | |
2960 | if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { | |
2961 | release_metapage(bp); | |
2962 | continue; | |
2963 | } | |
2964 | ||
2965 | /* agstart that computes to the same ag is treated as same; */ | |
2966 | agstart = le64_to_cpu(iagp->agstart); | |
2967 | /* iagp->agstart = agstart & ~(mp->db_agsize - 1); */ | |
2968 | n = agstart >> mp->db_agl2size; | |
2969 | ||
2970 | /* compute backed inodes */ | |
2971 | numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts)) | |
2972 | << L2INOSPEREXT; | |
2973 | if (numinos > 0) { | |
2974 | /* merge AG backed inodes */ | |
2975 | imap->im_agctl[n].numinos += numinos; | |
2976 | xnuminos += numinos; | |
2977 | } | |
2978 | ||
2979 | /* if any backed free inodes, insert at AG free inode list */ | |
2980 | if ((int) le32_to_cpu(iagp->nfreeinos) > 0) { | |
2981 | if ((head = imap->im_agctl[n].inofree) == -1) { | |
2982 | iagp->inofreefwd = cpu_to_le32(-1); | |
2983 | iagp->inofreeback = cpu_to_le32(-1); | |
2984 | } else { | |
2985 | if ((rc = diIAGRead(imap, head, &hbp))) { | |
2986 | rcx = rc; | |
2987 | goto nextiag; | |
2988 | } | |
2989 | hiagp = (struct iag *) hbp->data; | |
2990 | hiagp->inofreeback = iagp->iagnum; | |
2991 | iagp->inofreefwd = cpu_to_le32(head); | |
2992 | iagp->inofreeback = cpu_to_le32(-1); | |
2993 | write_metapage(hbp); | |
2994 | } | |
2995 | ||
2996 | imap->im_agctl[n].inofree = | |
2997 | le32_to_cpu(iagp->iagnum); | |
2998 | ||
2999 | /* merge AG backed free inodes */ | |
3000 | imap->im_agctl[n].numfree += | |
3001 | le32_to_cpu(iagp->nfreeinos); | |
3002 | xnumfree += le32_to_cpu(iagp->nfreeinos); | |
3003 | } | |
3004 | ||
3005 | /* if any free extents, insert at AG free extent list */ | |
3006 | if (le32_to_cpu(iagp->nfreeexts) > 0) { | |
3007 | if ((head = imap->im_agctl[n].extfree) == -1) { | |
3008 | iagp->extfreefwd = cpu_to_le32(-1); | |
3009 | iagp->extfreeback = cpu_to_le32(-1); | |
3010 | } else { | |
3011 | if ((rc = diIAGRead(imap, head, &hbp))) { | |
3012 | rcx = rc; | |
3013 | goto nextiag; | |
3014 | } | |
3015 | hiagp = (struct iag *) hbp->data; | |
3016 | hiagp->extfreeback = iagp->iagnum; | |
3017 | iagp->extfreefwd = cpu_to_le32(head); | |
3018 | iagp->extfreeback = cpu_to_le32(-1); | |
3019 | write_metapage(hbp); | |
3020 | } | |
3021 | ||
3022 | imap->im_agctl[n].extfree = | |
3023 | le32_to_cpu(iagp->iagnum); | |
3024 | } | |
3025 | ||
3026 | nextiag: | |
3027 | write_metapage(bp); | |
3028 | } | |
3029 | ||
3030 | if (xnuminos != atomic_read(&imap->im_numinos) || | |
3031 | xnumfree != atomic_read(&imap->im_numfree)) { | |
3032 | jfs_error(ipimap->i_sb, | |
3033 | "diExtendFs: numinos or numfree incorrect"); | |
3034 | return -EIO; | |
3035 | } | |
3036 | ||
3037 | return rcx; | |
3038 | } | |
3039 | ||
3040 | ||
3041 | /* | |
3042 | * duplicateIXtree() | |
3043 | * | |
3044 | * serialization: IWRITE_LOCK held on entry/exit | |
3045 | * | |
3046 | * note: shadow page with regular inode (rel.2); | |
3047 | */ | |
3048 | static void duplicateIXtree(struct super_block *sb, s64 blkno, | |
3049 | int xlen, s64 *xaddr) | |
3050 | { | |
3051 | struct jfs_superblock *j_sb; | |
3052 | struct buffer_head *bh; | |
3053 | struct inode *ip; | |
3054 | tid_t tid; | |
3055 | ||
3056 | /* if AIT2 ipmap2 is bad, do not try to update it */ | |
3057 | if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */ | |
3058 | return; | |
3059 | ip = diReadSpecial(sb, FILESYSTEM_I, 1); | |
3060 | if (ip == NULL) { | |
3061 | JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; | |
3062 | if (readSuper(sb, &bh)) | |
3063 | return; | |
3064 | j_sb = (struct jfs_superblock *)bh->b_data; | |
3065 | j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); | |
3066 | ||
3067 | mark_buffer_dirty(bh); | |
3068 | sync_dirty_buffer(bh); | |
3069 | brelse(bh); | |
3070 | return; | |
3071 | } | |
3072 | ||
3073 | /* start transaction */ | |
3074 | tid = txBegin(sb, COMMIT_FORCE); | |
3075 | /* update the inode map addressing structure to point to it */ | |
3076 | if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) { | |
3077 | JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; | |
3078 | txAbort(tid, 1); | |
3079 | goto cleanup; | |
3080 | ||
3081 | } | |
3082 | /* update the inode map's inode to reflect the extension */ | |
3083 | ip->i_size += PSIZE; | |
3084 | inode_add_bytes(ip, PSIZE); | |
3085 | txCommit(tid, 1, &ip, COMMIT_FORCE); | |
3086 | cleanup: | |
3087 | txEnd(tid); | |
3088 | diFreeSpecial(ip); | |
3089 | } | |
3090 | ||
3091 | /* | |
3092 | * NAME: copy_from_dinode() | |
3093 | * | |
3094 | * FUNCTION: Copies inode info from disk inode to in-memory inode | |
3095 | * | |
3096 | * RETURN VALUES: | |
3097 | * 0 - success | |
3098 | * -ENOMEM - insufficient memory | |
3099 | */ | |
3100 | static int copy_from_dinode(struct dinode * dip, struct inode *ip) | |
3101 | { | |
3102 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
3103 | ||
3104 | jfs_ip->fileset = le32_to_cpu(dip->di_fileset); | |
3105 | jfs_ip->mode2 = le32_to_cpu(dip->di_mode); | |
3106 | ||
3107 | ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff; | |
3108 | ip->i_nlink = le32_to_cpu(dip->di_nlink); | |
3109 | ip->i_uid = le32_to_cpu(dip->di_uid); | |
3110 | ip->i_gid = le32_to_cpu(dip->di_gid); | |
3111 | ip->i_size = le64_to_cpu(dip->di_size); | |
3112 | ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec); | |
3113 | ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec); | |
3114 | ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec); | |
3115 | ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec); | |
3116 | ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec); | |
3117 | ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec); | |
3118 | ip->i_blksize = ip->i_sb->s_blocksize; | |
3119 | ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks)); | |
3120 | ip->i_generation = le32_to_cpu(dip->di_gen); | |
3121 | ||
3122 | jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */ | |
3123 | jfs_ip->acl = dip->di_acl; /* as are dxd's */ | |
3124 | jfs_ip->ea = dip->di_ea; | |
3125 | jfs_ip->next_index = le32_to_cpu(dip->di_next_index); | |
3126 | jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec); | |
3127 | jfs_ip->acltype = le32_to_cpu(dip->di_acltype); | |
3128 | ||
3129 | if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) { | |
3130 | jfs_ip->dev = le32_to_cpu(dip->di_rdev); | |
3131 | ip->i_rdev = new_decode_dev(jfs_ip->dev); | |
3132 | } | |
3133 | ||
3134 | if (S_ISDIR(ip->i_mode)) { | |
3135 | memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384); | |
3136 | } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) { | |
3137 | memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288); | |
3138 | } else | |
3139 | memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128); | |
3140 | ||
3141 | /* Zero the in-memory-only stuff */ | |
3142 | jfs_ip->cflag = 0; | |
3143 | jfs_ip->btindex = 0; | |
3144 | jfs_ip->btorder = 0; | |
3145 | jfs_ip->bxflag = 0; | |
3146 | jfs_ip->blid = 0; | |
3147 | jfs_ip->atlhead = 0; | |
3148 | jfs_ip->atltail = 0; | |
3149 | jfs_ip->xtlid = 0; | |
3150 | return (0); | |
3151 | } | |
3152 | ||
3153 | /* | |
3154 | * NAME: copy_to_dinode() | |
3155 | * | |
3156 | * FUNCTION: Copies inode info from in-memory inode to disk inode | |
3157 | */ | |
3158 | static void copy_to_dinode(struct dinode * dip, struct inode *ip) | |
3159 | { | |
3160 | struct jfs_inode_info *jfs_ip = JFS_IP(ip); | |
3161 | ||
3162 | dip->di_fileset = cpu_to_le32(jfs_ip->fileset); | |
3163 | dip->di_inostamp = cpu_to_le32(JFS_SBI(ip->i_sb)->inostamp); | |
3164 | dip->di_number = cpu_to_le32(ip->i_ino); | |
3165 | dip->di_gen = cpu_to_le32(ip->i_generation); | |
3166 | dip->di_size = cpu_to_le64(ip->i_size); | |
3167 | dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks)); | |
3168 | dip->di_nlink = cpu_to_le32(ip->i_nlink); | |
3169 | dip->di_uid = cpu_to_le32(ip->i_uid); | |
3170 | dip->di_gid = cpu_to_le32(ip->i_gid); | |
3171 | /* | |
3172 | * mode2 is only needed for storing the higher order bits. | |
3173 | * Trust i_mode for the lower order ones | |
3174 | */ | |
3175 | dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) | ip->i_mode); | |
3176 | dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec); | |
3177 | dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec); | |
3178 | dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec); | |
3179 | dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec); | |
3180 | dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec); | |
3181 | dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec); | |
3182 | dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */ | |
3183 | dip->di_acl = jfs_ip->acl; /* as are dxd's */ | |
3184 | dip->di_ea = jfs_ip->ea; | |
3185 | dip->di_next_index = cpu_to_le32(jfs_ip->next_index); | |
3186 | dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime); | |
3187 | dip->di_otime.tv_nsec = 0; | |
3188 | dip->di_acltype = cpu_to_le32(jfs_ip->acltype); | |
3189 | if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) | |
3190 | dip->di_rdev = cpu_to_le32(jfs_ip->dev); | |
3191 | } | |
3192 | ||
3193 | #ifdef _JFS_DEBUG_IMAP | |
3194 | /* | |
3195 | * DBGdiInit() | |
3196 | */ | |
3197 | static void *DBGdiInit(struct inomap * imap) | |
3198 | { | |
3199 | u32 *dimap; | |
3200 | int size; | |
3201 | size = 64 * 1024; | |
3202 | if ((dimap = (u32 *) xmalloc(size, L2PSIZE, kernel_heap)) == NULL) | |
3203 | assert(0); | |
3204 | bzero((void *) dimap, size); | |
3205 | imap->im_DBGdimap = dimap; | |
3206 | } | |
3207 | ||
3208 | /* | |
3209 | * DBGdiAlloc() | |
3210 | */ | |
3211 | static void DBGdiAlloc(struct inomap * imap, ino_t ino) | |
3212 | { | |
3213 | u32 *dimap = imap->im_DBGdimap; | |
3214 | int w, b; | |
3215 | u32 m; | |
3216 | w = ino >> 5; | |
3217 | b = ino & 31; | |
3218 | m = 0x80000000 >> b; | |
3219 | assert(w < 64 * 256); | |
3220 | if (dimap[w] & m) { | |
3221 | printk("DEBUG diAlloc: duplicate alloc ino:0x%x\n", ino); | |
3222 | } | |
3223 | dimap[w] |= m; | |
3224 | } | |
3225 | ||
3226 | /* | |
3227 | * DBGdiFree() | |
3228 | */ | |
3229 | static void DBGdiFree(struct inomap * imap, ino_t ino) | |
3230 | { | |
3231 | u32 *dimap = imap->im_DBGdimap; | |
3232 | int w, b; | |
3233 | u32 m; | |
3234 | w = ino >> 5; | |
3235 | b = ino & 31; | |
3236 | m = 0x80000000 >> b; | |
3237 | assert(w < 64 * 256); | |
3238 | if ((dimap[w] & m) == 0) { | |
3239 | printk("DEBUG diFree: duplicate free ino:0x%x\n", ino); | |
3240 | } | |
3241 | dimap[w] &= ~m; | |
3242 | } | |
3243 | ||
3244 | static void dump_cp(struct inomap * ipimap, char *function, int line) | |
3245 | { | |
3246 | printk("\n* ********* *\nControl Page %s %d\n", function, line); | |
3247 | printk("FreeIAG %d\tNextIAG %d\n", ipimap->im_freeiag, | |
3248 | ipimap->im_nextiag); | |
3249 | printk("NumInos %d\tNumFree %d\n", | |
3250 | atomic_read(&ipimap->im_numinos), | |
3251 | atomic_read(&ipimap->im_numfree)); | |
3252 | printk("AG InoFree %d\tAG ExtFree %d\n", | |
3253 | ipimap->im_agctl[0].inofree, ipimap->im_agctl[0].extfree); | |
3254 | printk("AG NumInos %d\tAG NumFree %d\n", | |
3255 | ipimap->im_agctl[0].numinos, ipimap->im_agctl[0].numfree); | |
3256 | } | |
3257 | ||
3258 | static void dump_iag(struct iag * iag, char *function, int line) | |
3259 | { | |
3260 | printk("\n* ********* *\nIAG %s %d\n", function, line); | |
3261 | printk("IagNum %d\tIAG Free %d\n", le32_to_cpu(iag->iagnum), | |
3262 | le32_to_cpu(iag->iagfree)); | |
3263 | printk("InoFreeFwd %d\tInoFreeBack %d\n", | |
3264 | le32_to_cpu(iag->inofreefwd), | |
3265 | le32_to_cpu(iag->inofreeback)); | |
3266 | printk("ExtFreeFwd %d\tExtFreeBack %d\n", | |
3267 | le32_to_cpu(iag->extfreefwd), | |
3268 | le32_to_cpu(iag->extfreeback)); | |
3269 | printk("NFreeInos %d\tNFreeExts %d\n", le32_to_cpu(iag->nfreeinos), | |
3270 | le32_to_cpu(iag->nfreeexts)); | |
3271 | } | |
3272 | #endif /* _JFS_DEBUG_IMAP */ |