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1/*
2 * bmap.c - NILFS block mapping.
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23#include <linux/fs.h>
24#include <linux/string.h>
25#include <linux/errno.h>
26#include "nilfs.h"
27#include "bmap.h"
28#include "sb.h"
29#include "btnode.h"
30#include "mdt.h"
31#include "dat.h"
32#include "alloc.h"
33
34int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
35 __u64 *ptrp)
36{
37 __u64 ptr;
38 int ret;
39
40 down_read(&bmap->b_sem);
41 ret = (*bmap->b_ops->bop_lookup)(bmap, key, level, ptrp);
42 if (ret < 0)
43 goto out;
44 if (bmap->b_pops->bpop_translate != NULL) {
45 ret = (*bmap->b_pops->bpop_translate)(bmap, *ptrp, &ptr);
46 if (ret < 0)
47 goto out;
48 *ptrp = ptr;
49 }
50
51 out:
52 up_read(&bmap->b_sem);
53 return ret;
54}
55
56
57/**
58 * nilfs_bmap_lookup - find a record
59 * @bmap: bmap
60 * @key: key
61 * @recp: pointer to record
62 *
63 * Description: nilfs_bmap_lookup() finds a record whose key matches @key in
64 * @bmap.
65 *
66 * Return Value: On success, 0 is returned and the record associated with @key
67 * is stored in the place pointed by @recp. On error, one of the following
68 * negative error codes is returned.
69 *
70 * %-EIO - I/O error.
71 *
72 * %-ENOMEM - Insufficient amount of memory available.
73 *
74 * %-ENOENT - A record associated with @key does not exist.
75 */
76int nilfs_bmap_lookup(struct nilfs_bmap *bmap,
77 unsigned long key,
78 unsigned long *recp)
79{
80 __u64 ptr;
81 int ret;
82
83 /* XXX: use macro for level 1 */
84 ret = nilfs_bmap_lookup_at_level(bmap, key, 1, &ptr);
85 if (recp != NULL)
86 *recp = ptr;
87 return ret;
88}
89
90static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
91{
92 __u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
93 __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
94 int ret, n;
95
96 if (bmap->b_ops->bop_check_insert != NULL) {
97 ret = (*bmap->b_ops->bop_check_insert)(bmap, key);
98 if (ret > 0) {
99 n = (*bmap->b_ops->bop_gather_data)(
100 bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
101 if (n < 0)
102 return n;
103 ret = nilfs_btree_convert_and_insert(
104 bmap, key, ptr, keys, ptrs, n,
105 NILFS_BMAP_LARGE_LOW, NILFS_BMAP_LARGE_HIGH);
106 if (ret == 0)
107 bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
108
109 return ret;
110 } else if (ret < 0)
111 return ret;
112 }
113
114 return (*bmap->b_ops->bop_insert)(bmap, key, ptr);
115}
116
117/**
118 * nilfs_bmap_insert - insert a new key-record pair into a bmap
119 * @bmap: bmap
120 * @key: key
121 * @rec: record
122 *
123 * Description: nilfs_bmap_insert() inserts the new key-record pair specified
124 * by @key and @rec into @bmap.
125 *
126 * Return Value: On success, 0 is returned. On error, one of the following
127 * negative error codes is returned.
128 *
129 * %-EIO - I/O error.
130 *
131 * %-ENOMEM - Insufficient amount of memory available.
132 *
133 * %-EEXIST - A record associated with @key already exist.
134 */
135int nilfs_bmap_insert(struct nilfs_bmap *bmap,
136 unsigned long key,
137 unsigned long rec)
138{
139 int ret;
140
141 down_write(&bmap->b_sem);
142 ret = nilfs_bmap_do_insert(bmap, key, rec);
143 up_write(&bmap->b_sem);
144 return ret;
145}
146
147static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
148{
149 __u64 keys[NILFS_BMAP_LARGE_LOW + 1];
150 __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
151 int ret, n;
152
153 if (bmap->b_ops->bop_check_delete != NULL) {
154 ret = (*bmap->b_ops->bop_check_delete)(bmap, key);
155 if (ret > 0) {
156 n = (*bmap->b_ops->bop_gather_data)(
157 bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
158 if (n < 0)
159 return n;
160 ret = nilfs_direct_delete_and_convert(
161 bmap, key, keys, ptrs, n,
162 NILFS_BMAP_SMALL_LOW, NILFS_BMAP_SMALL_HIGH);
163 if (ret == 0)
164 bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
165
166 return ret;
167 } else if (ret < 0)
168 return ret;
169 }
170
171 return (*bmap->b_ops->bop_delete)(bmap, key);
172}
173
174int nilfs_bmap_last_key(struct nilfs_bmap *bmap, unsigned long *key)
175{
176 __u64 lastkey;
177 int ret;
178
179 down_read(&bmap->b_sem);
180 ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey);
181 if (!ret)
182 *key = lastkey;
183 up_read(&bmap->b_sem);
184 return ret;
185}
186
187/**
188 * nilfs_bmap_delete - delete a key-record pair from a bmap
189 * @bmap: bmap
190 * @key: key
191 *
192 * Description: nilfs_bmap_delete() deletes the key-record pair specified by
193 * @key from @bmap.
194 *
195 * Return Value: On success, 0 is returned. On error, one of the following
196 * negative error codes is returned.
197 *
198 * %-EIO - I/O error.
199 *
200 * %-ENOMEM - Insufficient amount of memory available.
201 *
202 * %-ENOENT - A record associated with @key does not exist.
203 */
204int nilfs_bmap_delete(struct nilfs_bmap *bmap, unsigned long key)
205{
206 int ret;
207
208 down_write(&bmap->b_sem);
209 ret = nilfs_bmap_do_delete(bmap, key);
210 up_write(&bmap->b_sem);
211 return ret;
212}
213
214static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, unsigned long key)
215{
216 __u64 lastkey;
217 int ret;
218
219 ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey);
220 if (ret < 0) {
221 if (ret == -ENOENT)
222 ret = 0;
223 return ret;
224 }
225
226 while (key <= lastkey) {
227 ret = nilfs_bmap_do_delete(bmap, lastkey);
228 if (ret < 0)
229 return ret;
230 ret = (*bmap->b_ops->bop_last_key)(bmap, &lastkey);
231 if (ret < 0) {
232 if (ret == -ENOENT)
233 ret = 0;
234 return ret;
235 }
236 }
237 return 0;
238}
239
240/**
241 * nilfs_bmap_truncate - truncate a bmap to a specified key
242 * @bmap: bmap
243 * @key: key
244 *
245 * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
246 * greater than or equal to @key from @bmap.
247 *
248 * Return Value: On success, 0 is returned. On error, one of the following
249 * negative error codes is returned.
250 *
251 * %-EIO - I/O error.
252 *
253 * %-ENOMEM - Insufficient amount of memory available.
254 */
255int nilfs_bmap_truncate(struct nilfs_bmap *bmap, unsigned long key)
256{
257 int ret;
258
259 down_write(&bmap->b_sem);
260 ret = nilfs_bmap_do_truncate(bmap, key);
261 up_write(&bmap->b_sem);
262 return ret;
263}
264
265/**
266 * nilfs_bmap_clear - free resources a bmap holds
267 * @bmap: bmap
268 *
269 * Description: nilfs_bmap_clear() frees resources associated with @bmap.
270 */
271void nilfs_bmap_clear(struct nilfs_bmap *bmap)
272{
273 down_write(&bmap->b_sem);
274 if (bmap->b_ops->bop_clear != NULL)
275 (*bmap->b_ops->bop_clear)(bmap);
276 up_write(&bmap->b_sem);
277}
278
279/**
280 * nilfs_bmap_propagate - propagate dirty state
281 * @bmap: bmap
282 * @bh: buffer head
283 *
284 * Description: nilfs_bmap_propagate() marks the buffers that directly or
285 * indirectly refer to the block specified by @bh dirty.
286 *
287 * Return Value: On success, 0 is returned. On error, one of the following
288 * negative error codes is returned.
289 *
290 * %-EIO - I/O error.
291 *
292 * %-ENOMEM - Insufficient amount of memory available.
293 */
294int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
295{
296 int ret;
297
298 down_write(&bmap->b_sem);
299 ret = (*bmap->b_ops->bop_propagate)(bmap, bh);
300 up_write(&bmap->b_sem);
301 return ret;
302}
303
304/**
305 * nilfs_bmap_lookup_dirty_buffers -
306 * @bmap: bmap
307 * @listp: pointer to buffer head list
308 */
309void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
310 struct list_head *listp)
311{
312 if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
313 (*bmap->b_ops->bop_lookup_dirty_buffers)(bmap, listp);
314}
315
316/**
317 * nilfs_bmap_assign - assign a new block number to a block
318 * @bmap: bmap
319 * @bhp: pointer to buffer head
320 * @blocknr: block number
321 * @binfo: block information
322 *
323 * Description: nilfs_bmap_assign() assigns the block number @blocknr to the
324 * buffer specified by @bh.
325 *
326 * Return Value: On success, 0 is returned and the buffer head of a newly
327 * create buffer and the block information associated with the buffer are
328 * stored in the place pointed by @bh and @binfo, respectively. On error, one
329 * of the following negative error codes is returned.
330 *
331 * %-EIO - I/O error.
332 *
333 * %-ENOMEM - Insufficient amount of memory available.
334 */
335int nilfs_bmap_assign(struct nilfs_bmap *bmap,
336 struct buffer_head **bh,
337 unsigned long blocknr,
338 union nilfs_binfo *binfo)
339{
340 int ret;
341
342 down_write(&bmap->b_sem);
343 ret = (*bmap->b_ops->bop_assign)(bmap, bh, blocknr, binfo);
344 up_write(&bmap->b_sem);
345 return ret;
346}
347
348/**
349 * nilfs_bmap_mark - mark block dirty
350 * @bmap: bmap
351 * @key: key
352 * @level: level
353 *
354 * Description: nilfs_bmap_mark() marks the block specified by @key and @level
355 * as dirty.
356 *
357 * Return Value: On success, 0 is returned. On error, one of the following
358 * negative error codes is returned.
359 *
360 * %-EIO - I/O error.
361 *
362 * %-ENOMEM - Insufficient amount of memory available.
363 */
364int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
365{
366 int ret;
367
368 if (bmap->b_ops->bop_mark == NULL)
369 return 0;
370
371 down_write(&bmap->b_sem);
372 ret = (*bmap->b_ops->bop_mark)(bmap, key, level);
373 up_write(&bmap->b_sem);
374 return ret;
375}
376
377/**
378 * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
379 * @bmap: bmap
380 *
381 * Description: nilfs_test_and_clear() is the atomic operation to test and
382 * clear the dirty state of @bmap.
383 *
384 * Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
385 */
386int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
387{
388 int ret;
389
390 down_write(&bmap->b_sem);
391 ret = nilfs_bmap_dirty(bmap);
392 nilfs_bmap_clear_dirty(bmap);
393 up_write(&bmap->b_sem);
394 return ret;
395}
396
397
398/*
399 * Internal use only
400 */
401
402void nilfs_bmap_add_blocks(const struct nilfs_bmap *bmap, int n)
403{
404 inode_add_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n);
405 if (NILFS_MDT(bmap->b_inode))
406 nilfs_mdt_mark_dirty(bmap->b_inode);
407 else
408 mark_inode_dirty(bmap->b_inode);
409}
410
411void nilfs_bmap_sub_blocks(const struct nilfs_bmap *bmap, int n)
412{
413 inode_sub_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n);
414 if (NILFS_MDT(bmap->b_inode))
415 nilfs_mdt_mark_dirty(bmap->b_inode);
416 else
417 mark_inode_dirty(bmap->b_inode);
418}
419
420int nilfs_bmap_get_block(const struct nilfs_bmap *bmap, __u64 ptr,
421 struct buffer_head **bhp)
422{
423 return nilfs_btnode_get(&NILFS_BMAP_I(bmap)->i_btnode_cache,
424 ptr, 0, bhp, 0);
425}
426
427void nilfs_bmap_put_block(const struct nilfs_bmap *bmap,
428 struct buffer_head *bh)
429{
430 brelse(bh);
431}
432
433int nilfs_bmap_get_new_block(const struct nilfs_bmap *bmap, __u64 ptr,
434 struct buffer_head **bhp)
435{
436 int ret;
437
438 ret = nilfs_btnode_get(&NILFS_BMAP_I(bmap)->i_btnode_cache,
439 ptr, 0, bhp, 1);
440 if (ret < 0)
441 return ret;
442 set_buffer_nilfs_volatile(*bhp);
443 return 0;
444}
445
446void nilfs_bmap_delete_block(const struct nilfs_bmap *bmap,
447 struct buffer_head *bh)
448{
449 nilfs_btnode_delete(bh);
450}
451
452__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
453 const struct buffer_head *bh)
454{
455 struct buffer_head *pbh;
456 __u64 key;
457
458 key = page_index(bh->b_page) << (PAGE_CACHE_SHIFT -
459 bmap->b_inode->i_blkbits);
460 for (pbh = page_buffers(bh->b_page); pbh != bh;
461 pbh = pbh->b_this_page, key++);
462
463 return key;
464}
465
466__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
467{
468 __s64 diff;
469
470 diff = key - bmap->b_last_allocated_key;
471 if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
472 (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
473 (bmap->b_last_allocated_ptr + diff > 0))
474 return bmap->b_last_allocated_ptr + diff;
475 else
476 return NILFS_BMAP_INVALID_PTR;
477}
478
479static struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
480{
481 return nilfs_dat_inode(NILFS_I_NILFS(bmap->b_inode));
482}
483
484#define NILFS_BMAP_GROUP_DIV 8
485__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
486{
487 struct inode *dat = nilfs_bmap_get_dat(bmap);
488 unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
489 unsigned long group = bmap->b_inode->i_ino / entries_per_group;
490
491 return group * entries_per_group +
492 (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
493 (entries_per_group / NILFS_BMAP_GROUP_DIV);
494}
495
496static int nilfs_bmap_prepare_alloc_v(struct nilfs_bmap *bmap,
497 union nilfs_bmap_ptr_req *req)
498{
499 return nilfs_dat_prepare_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req);
500}
501
502static void nilfs_bmap_commit_alloc_v(struct nilfs_bmap *bmap,
503 union nilfs_bmap_ptr_req *req)
504{
505 nilfs_dat_commit_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req);
506}
507
508static void nilfs_bmap_abort_alloc_v(struct nilfs_bmap *bmap,
509 union nilfs_bmap_ptr_req *req)
510{
511 nilfs_dat_abort_alloc(nilfs_bmap_get_dat(bmap), &req->bpr_req);
512}
513
514static int nilfs_bmap_prepare_start_v(struct nilfs_bmap *bmap,
515 union nilfs_bmap_ptr_req *req)
516{
517 return nilfs_dat_prepare_start(nilfs_bmap_get_dat(bmap), &req->bpr_req);
518}
519
520static void nilfs_bmap_commit_start_v(struct nilfs_bmap *bmap,
521 union nilfs_bmap_ptr_req *req,
522 sector_t blocknr)
523{
524 nilfs_dat_commit_start(nilfs_bmap_get_dat(bmap), &req->bpr_req,
525 blocknr);
526}
527
528static void nilfs_bmap_abort_start_v(struct nilfs_bmap *bmap,
529 union nilfs_bmap_ptr_req *req)
530{
531 nilfs_dat_abort_start(nilfs_bmap_get_dat(bmap), &req->bpr_req);
532}
533
534static int nilfs_bmap_prepare_end_v(struct nilfs_bmap *bmap,
535 union nilfs_bmap_ptr_req *req)
536{
537 return nilfs_dat_prepare_end(nilfs_bmap_get_dat(bmap), &req->bpr_req);
538}
539
540static void nilfs_bmap_commit_end_v(struct nilfs_bmap *bmap,
541 union nilfs_bmap_ptr_req *req)
542{
543 nilfs_dat_commit_end(nilfs_bmap_get_dat(bmap), &req->bpr_req, 0);
544}
545
546static void nilfs_bmap_commit_end_vmdt(struct nilfs_bmap *bmap,
547 union nilfs_bmap_ptr_req *req)
548{
549 nilfs_dat_commit_end(nilfs_bmap_get_dat(bmap), &req->bpr_req, 1);
550}
551
552static void nilfs_bmap_abort_end_v(struct nilfs_bmap *bmap,
553 union nilfs_bmap_ptr_req *req)
554{
555 nilfs_dat_abort_end(nilfs_bmap_get_dat(bmap), &req->bpr_req);
556}
557
558int nilfs_bmap_move_v(const struct nilfs_bmap *bmap, __u64 vblocknr,
559 sector_t blocknr)
560{
561 return nilfs_dat_move(nilfs_bmap_get_dat(bmap), vblocknr, blocknr);
562}
563
564int nilfs_bmap_mark_dirty(const struct nilfs_bmap *bmap, __u64 vblocknr)
565{
566 return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(bmap), vblocknr);
567}
568
569int nilfs_bmap_prepare_update(struct nilfs_bmap *bmap,
570 union nilfs_bmap_ptr_req *oldreq,
571 union nilfs_bmap_ptr_req *newreq)
572{
573 int ret;
574
575 ret = (*bmap->b_pops->bpop_prepare_end_ptr)(bmap, oldreq);
576 if (ret < 0)
577 return ret;
578 ret = (*bmap->b_pops->bpop_prepare_alloc_ptr)(bmap, newreq);
579 if (ret < 0)
580 (*bmap->b_pops->bpop_abort_end_ptr)(bmap, oldreq);
581
582 return ret;
583}
584
585void nilfs_bmap_commit_update(struct nilfs_bmap *bmap,
586 union nilfs_bmap_ptr_req *oldreq,
587 union nilfs_bmap_ptr_req *newreq)
588{
589 (*bmap->b_pops->bpop_commit_end_ptr)(bmap, oldreq);
590 (*bmap->b_pops->bpop_commit_alloc_ptr)(bmap, newreq);
591}
592
593void nilfs_bmap_abort_update(struct nilfs_bmap *bmap,
594 union nilfs_bmap_ptr_req *oldreq,
595 union nilfs_bmap_ptr_req *newreq)
596{
597 (*bmap->b_pops->bpop_abort_end_ptr)(bmap, oldreq);
598 (*bmap->b_pops->bpop_abort_alloc_ptr)(bmap, newreq);
599}
600
601static int nilfs_bmap_translate_v(const struct nilfs_bmap *bmap, __u64 ptr,
602 __u64 *ptrp)
603{
604 sector_t blocknr;
605 int ret;
606
607 ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), ptr, &blocknr);
608 if (ret < 0)
609 return ret;
610 if (ptrp != NULL)
611 *ptrp = blocknr;
612 return 0;
613}
614
615static int nilfs_bmap_prepare_alloc_p(struct nilfs_bmap *bmap,
616 union nilfs_bmap_ptr_req *req)
617{
618 /* ignore target ptr */
619 req->bpr_ptr = bmap->b_last_allocated_ptr++;
620 return 0;
621}
622
623static void nilfs_bmap_commit_alloc_p(struct nilfs_bmap *bmap,
624 union nilfs_bmap_ptr_req *req)
625{
626 /* do nothing */
627}
628
629static void nilfs_bmap_abort_alloc_p(struct nilfs_bmap *bmap,
630 union nilfs_bmap_ptr_req *req)
631{
632 bmap->b_last_allocated_ptr--;
633}
634
635static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_v = {
636 .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_v,
637 .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_v,
638 .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_v,
639 .bpop_prepare_start_ptr = nilfs_bmap_prepare_start_v,
640 .bpop_commit_start_ptr = nilfs_bmap_commit_start_v,
641 .bpop_abort_start_ptr = nilfs_bmap_abort_start_v,
642 .bpop_prepare_end_ptr = nilfs_bmap_prepare_end_v,
643 .bpop_commit_end_ptr = nilfs_bmap_commit_end_v,
644 .bpop_abort_end_ptr = nilfs_bmap_abort_end_v,
645
646 .bpop_translate = nilfs_bmap_translate_v,
647};
648
649static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_vmdt = {
650 .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_v,
651 .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_v,
652 .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_v,
653 .bpop_prepare_start_ptr = nilfs_bmap_prepare_start_v,
654 .bpop_commit_start_ptr = nilfs_bmap_commit_start_v,
655 .bpop_abort_start_ptr = nilfs_bmap_abort_start_v,
656 .bpop_prepare_end_ptr = nilfs_bmap_prepare_end_v,
657 .bpop_commit_end_ptr = nilfs_bmap_commit_end_vmdt,
658 .bpop_abort_end_ptr = nilfs_bmap_abort_end_v,
659
660 .bpop_translate = nilfs_bmap_translate_v,
661};
662
663static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_p = {
664 .bpop_prepare_alloc_ptr = nilfs_bmap_prepare_alloc_p,
665 .bpop_commit_alloc_ptr = nilfs_bmap_commit_alloc_p,
666 .bpop_abort_alloc_ptr = nilfs_bmap_abort_alloc_p,
667 .bpop_prepare_start_ptr = NULL,
668 .bpop_commit_start_ptr = NULL,
669 .bpop_abort_start_ptr = NULL,
670 .bpop_prepare_end_ptr = NULL,
671 .bpop_commit_end_ptr = NULL,
672 .bpop_abort_end_ptr = NULL,
673
674 .bpop_translate = NULL,
675};
676
677static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_gc = {
678 .bpop_prepare_alloc_ptr = NULL,
679 .bpop_commit_alloc_ptr = NULL,
680 .bpop_abort_alloc_ptr = NULL,
681 .bpop_prepare_start_ptr = NULL,
682 .bpop_commit_start_ptr = NULL,
683 .bpop_abort_start_ptr = NULL,
684 .bpop_prepare_end_ptr = NULL,
685 .bpop_commit_end_ptr = NULL,
686 .bpop_abort_end_ptr = NULL,
687
688 .bpop_translate = NULL,
689};
690
691/**
692 * nilfs_bmap_read - read a bmap from an inode
693 * @bmap: bmap
694 * @raw_inode: on-disk inode
695 *
696 * Description: nilfs_bmap_read() initializes the bmap @bmap.
697 *
698 * Return Value: On success, 0 is returned. On error, the following negative
699 * error code is returned.
700 *
701 * %-ENOMEM - Insufficient amount of memory available.
702 */
703int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
704{
705 if (raw_inode == NULL)
706 memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
707 else
708 memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
709
710 init_rwsem(&bmap->b_sem);
711 bmap->b_state = 0;
712 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
713 switch (bmap->b_inode->i_ino) {
714 case NILFS_DAT_INO:
715 bmap->b_pops = &nilfs_bmap_ptr_ops_p;
716 bmap->b_last_allocated_key = 0; /* XXX: use macro */
717 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
718 break;
719 case NILFS_CPFILE_INO:
720 case NILFS_SUFILE_INO:
721 bmap->b_pops = &nilfs_bmap_ptr_ops_vmdt;
722 bmap->b_last_allocated_key = 0; /* XXX: use macro */
723 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
724 break;
725 default:
726 bmap->b_pops = &nilfs_bmap_ptr_ops_v;
727 bmap->b_last_allocated_key = 0; /* XXX: use macro */
728 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
729 break;
730 }
731
732 return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
733 nilfs_btree_init(bmap,
734 NILFS_BMAP_LARGE_LOW,
735 NILFS_BMAP_LARGE_HIGH) :
736 nilfs_direct_init(bmap,
737 NILFS_BMAP_SMALL_LOW,
738 NILFS_BMAP_SMALL_HIGH);
739}
740
741/**
742 * nilfs_bmap_write - write back a bmap to an inode
743 * @bmap: bmap
744 * @raw_inode: on-disk inode
745 *
746 * Description: nilfs_bmap_write() stores @bmap in @raw_inode.
747 */
748void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
749{
750 down_write(&bmap->b_sem);
751 memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
752 NILFS_INODE_BMAP_SIZE * sizeof(__le64));
753 if (bmap->b_inode->i_ino == NILFS_DAT_INO)
754 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
755
756 up_write(&bmap->b_sem);
757}
758
759void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
760{
761 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
762 init_rwsem(&bmap->b_sem);
763 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
764 bmap->b_pops = &nilfs_bmap_ptr_ops_gc;
765 bmap->b_last_allocated_key = 0;
766 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
767 bmap->b_state = 0;
768 nilfs_btree_init_gc(bmap);
769}
770
771void nilfs_bmap_init_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
772{
773 memcpy(gcbmap, bmap, sizeof(union nilfs_bmap_union));
774 init_rwsem(&gcbmap->b_sem);
775 gcbmap->b_inode = &NILFS_BMAP_I(gcbmap)->vfs_inode;
776}
777
778void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
779{
780 memcpy(bmap, gcbmap, sizeof(union nilfs_bmap_union));
781 init_rwsem(&bmap->b_sem);
782 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
783}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 15:20:22 -0500