Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS block mapping.
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10#include <linux/fs.h>
11#include <linux/string.h>
12#include <linux/errno.h>
13#include "nilfs.h"
14#include "bmap.h"
15#include "btree.h"
16#include "direct.h"
17#include "btnode.h"
18#include "mdt.h"
19#include "dat.h"
20#include "alloc.h"
21
22struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
23{
24 struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info;
25
26 return nilfs->ns_dat;
27}
28
29static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap,
30 const char *fname, int err)
31{
32 struct inode *inode = bmap->b_inode;
33
34 if (err == -EINVAL) {
35 __nilfs_error(inode->i_sb, fname,
36 "broken bmap (inode number=%lu)", inode->i_ino);
37 err = -EIO;
38 }
39 return err;
40}
41
42/**
43 * nilfs_bmap_lookup_at_level - find a data block or node block
44 * @bmap: bmap
45 * @key: key
46 * @level: level
47 * @ptrp: place to store the value associated to @key
48 *
49 * Description: nilfs_bmap_lookup_at_level() finds a record whose key
50 * matches @key in the block at @level of the bmap.
51 *
52 * Return Value: On success, 0 is returned and the record associated with @key
53 * is stored in the place pointed by @ptrp. On error, one of the following
54 * negative error codes is returned.
55 *
56 * %-EIO - I/O error.
57 *
58 * %-ENOMEM - Insufficient amount of memory available.
59 *
60 * %-ENOENT - A record associated with @key does not exist.
61 */
62int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
63 __u64 *ptrp)
64{
65 sector_t blocknr;
66 int ret;
67
68 down_read(&bmap->b_sem);
69 ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
70 if (ret < 0)
71 goto out;
72
73 if (NILFS_BMAP_USE_VBN(bmap)) {
74 ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
75 &blocknr);
76 if (!ret)
77 *ptrp = blocknr;
78 else if (ret == -ENOENT) {
79 /*
80 * If there was no valid entry in DAT for the block
81 * address obtained by b_ops->bop_lookup, then pass
82 * internal code -EINVAL to nilfs_bmap_convert_error
83 * to treat it as metadata corruption.
84 */
85 ret = -EINVAL;
86 }
87 }
88
89 out:
90 up_read(&bmap->b_sem);
91 return nilfs_bmap_convert_error(bmap, __func__, ret);
92}
93
94int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
95 unsigned int maxblocks)
96{
97 int ret;
98
99 down_read(&bmap->b_sem);
100 ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
101 up_read(&bmap->b_sem);
102
103 return nilfs_bmap_convert_error(bmap, __func__, ret);
104}
105
106static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
107{
108 __u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
109 __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
110 int ret, n;
111
112 if (bmap->b_ops->bop_check_insert != NULL) {
113 ret = bmap->b_ops->bop_check_insert(bmap, key);
114 if (ret > 0) {
115 n = bmap->b_ops->bop_gather_data(
116 bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
117 if (n < 0)
118 return n;
119 ret = nilfs_btree_convert_and_insert(
120 bmap, key, ptr, keys, ptrs, n);
121 if (ret == 0)
122 bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
123
124 return ret;
125 } else if (ret < 0)
126 return ret;
127 }
128
129 return bmap->b_ops->bop_insert(bmap, key, ptr);
130}
131
132/**
133 * nilfs_bmap_insert - insert a new key-record pair into a bmap
134 * @bmap: bmap
135 * @key: key
136 * @rec: record
137 *
138 * Description: nilfs_bmap_insert() inserts the new key-record pair specified
139 * by @key and @rec into @bmap.
140 *
141 * Return Value: On success, 0 is returned. On error, one of the following
142 * negative error codes is returned.
143 *
144 * %-EIO - I/O error.
145 *
146 * %-ENOMEM - Insufficient amount of memory available.
147 *
148 * %-EEXIST - A record associated with @key already exist.
149 */
150int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec)
151{
152 int ret;
153
154 down_write(&bmap->b_sem);
155 ret = nilfs_bmap_do_insert(bmap, key, rec);
156 up_write(&bmap->b_sem);
157
158 return nilfs_bmap_convert_error(bmap, __func__, ret);
159}
160
161static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
162{
163 __u64 keys[NILFS_BMAP_LARGE_LOW + 1];
164 __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
165 int ret, n;
166
167 if (bmap->b_ops->bop_check_delete != NULL) {
168 ret = bmap->b_ops->bop_check_delete(bmap, key);
169 if (ret > 0) {
170 n = bmap->b_ops->bop_gather_data(
171 bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
172 if (n < 0)
173 return n;
174 ret = nilfs_direct_delete_and_convert(
175 bmap, key, keys, ptrs, n);
176 if (ret == 0)
177 bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
178
179 return ret;
180 } else if (ret < 0)
181 return ret;
182 }
183
184 return bmap->b_ops->bop_delete(bmap, key);
185}
186
187/**
188 * nilfs_bmap_seek_key - seek a valid entry and return its key
189 * @bmap: bmap struct
190 * @start: start key number
191 * @keyp: place to store valid key
192 *
193 * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap
194 * starting from @start, and stores it to @keyp if found.
195 *
196 * Return Value: On success, 0 is returned. On error, one of the following
197 * negative error codes is returned.
198 *
199 * %-EIO - I/O error.
200 *
201 * %-ENOMEM - Insufficient amount of memory available.
202 *
203 * %-ENOENT - No valid entry was found
204 */
205int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp)
206{
207 int ret;
208
209 down_read(&bmap->b_sem);
210 ret = bmap->b_ops->bop_seek_key(bmap, start, keyp);
211 up_read(&bmap->b_sem);
212
213 if (ret < 0)
214 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
215 return ret;
216}
217
218int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp)
219{
220 int ret;
221
222 down_read(&bmap->b_sem);
223 ret = bmap->b_ops->bop_last_key(bmap, keyp);
224 up_read(&bmap->b_sem);
225
226 if (ret < 0)
227 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
228 return ret;
229}
230
231/**
232 * nilfs_bmap_delete - delete a key-record pair from a bmap
233 * @bmap: bmap
234 * @key: key
235 *
236 * Description: nilfs_bmap_delete() deletes the key-record pair specified by
237 * @key from @bmap.
238 *
239 * Return Value: On success, 0 is returned. On error, one of the following
240 * negative error codes is returned.
241 *
242 * %-EIO - I/O error.
243 *
244 * %-ENOMEM - Insufficient amount of memory available.
245 *
246 * %-ENOENT - A record associated with @key does not exist.
247 */
248int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key)
249{
250 int ret;
251
252 down_write(&bmap->b_sem);
253 ret = nilfs_bmap_do_delete(bmap, key);
254 up_write(&bmap->b_sem);
255
256 return nilfs_bmap_convert_error(bmap, __func__, ret);
257}
258
259static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 key)
260{
261 __u64 lastkey;
262 int ret;
263
264 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
265 if (ret < 0) {
266 if (ret == -ENOENT)
267 ret = 0;
268 return ret;
269 }
270
271 while (key <= lastkey) {
272 ret = nilfs_bmap_do_delete(bmap, lastkey);
273 if (ret < 0)
274 return ret;
275 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
276 if (ret < 0) {
277 if (ret == -ENOENT)
278 ret = 0;
279 return ret;
280 }
281 }
282 return 0;
283}
284
285/**
286 * nilfs_bmap_truncate - truncate a bmap to a specified key
287 * @bmap: bmap
288 * @key: key
289 *
290 * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
291 * greater than or equal to @key from @bmap.
292 *
293 * Return Value: On success, 0 is returned. On error, one of the following
294 * negative error codes is returned.
295 *
296 * %-EIO - I/O error.
297 *
298 * %-ENOMEM - Insufficient amount of memory available.
299 */
300int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key)
301{
302 int ret;
303
304 down_write(&bmap->b_sem);
305 ret = nilfs_bmap_do_truncate(bmap, key);
306 up_write(&bmap->b_sem);
307
308 return nilfs_bmap_convert_error(bmap, __func__, ret);
309}
310
311/**
312 * nilfs_bmap_clear - free resources a bmap holds
313 * @bmap: bmap
314 *
315 * Description: nilfs_bmap_clear() frees resources associated with @bmap.
316 */
317void nilfs_bmap_clear(struct nilfs_bmap *bmap)
318{
319 down_write(&bmap->b_sem);
320 if (bmap->b_ops->bop_clear != NULL)
321 bmap->b_ops->bop_clear(bmap);
322 up_write(&bmap->b_sem);
323}
324
325/**
326 * nilfs_bmap_propagate - propagate dirty state
327 * @bmap: bmap
328 * @bh: buffer head
329 *
330 * Description: nilfs_bmap_propagate() marks the buffers that directly or
331 * indirectly refer to the block specified by @bh dirty.
332 *
333 * Return Value: On success, 0 is returned. On error, one of the following
334 * negative error codes is returned.
335 *
336 * %-EIO - I/O error.
337 *
338 * %-ENOMEM - Insufficient amount of memory available.
339 */
340int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
341{
342 int ret;
343
344 down_write(&bmap->b_sem);
345 ret = bmap->b_ops->bop_propagate(bmap, bh);
346 up_write(&bmap->b_sem);
347
348 return nilfs_bmap_convert_error(bmap, __func__, ret);
349}
350
351/**
352 * nilfs_bmap_lookup_dirty_buffers -
353 * @bmap: bmap
354 * @listp: pointer to buffer head list
355 */
356void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
357 struct list_head *listp)
358{
359 if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
360 bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);
361}
362
363/**
364 * nilfs_bmap_assign - assign a new block number to a block
365 * @bmap: bmap
366 * @bh: pointer to buffer head
367 * @blocknr: block number
368 * @binfo: block information
369 *
370 * Description: nilfs_bmap_assign() assigns the block number @blocknr to the
371 * buffer specified by @bh.
372 *
373 * Return Value: On success, 0 is returned and the buffer head of a newly
374 * create buffer and the block information associated with the buffer are
375 * stored in the place pointed by @bh and @binfo, respectively. On error, one
376 * of the following negative error codes is returned.
377 *
378 * %-EIO - I/O error.
379 *
380 * %-ENOMEM - Insufficient amount of memory available.
381 */
382int nilfs_bmap_assign(struct nilfs_bmap *bmap,
383 struct buffer_head **bh,
384 unsigned long blocknr,
385 union nilfs_binfo *binfo)
386{
387 int ret;
388
389 down_write(&bmap->b_sem);
390 ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo);
391 up_write(&bmap->b_sem);
392
393 return nilfs_bmap_convert_error(bmap, __func__, ret);
394}
395
396/**
397 * nilfs_bmap_mark - mark block dirty
398 * @bmap: bmap
399 * @key: key
400 * @level: level
401 *
402 * Description: nilfs_bmap_mark() marks the block specified by @key and @level
403 * as dirty.
404 *
405 * Return Value: On success, 0 is returned. On error, one of the following
406 * negative error codes is returned.
407 *
408 * %-EIO - I/O error.
409 *
410 * %-ENOMEM - Insufficient amount of memory available.
411 */
412int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
413{
414 int ret;
415
416 if (bmap->b_ops->bop_mark == NULL)
417 return 0;
418
419 down_write(&bmap->b_sem);
420 ret = bmap->b_ops->bop_mark(bmap, key, level);
421 up_write(&bmap->b_sem);
422
423 return nilfs_bmap_convert_error(bmap, __func__, ret);
424}
425
426/**
427 * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
428 * @bmap: bmap
429 *
430 * Description: nilfs_test_and_clear() is the atomic operation to test and
431 * clear the dirty state of @bmap.
432 *
433 * Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
434 */
435int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
436{
437 int ret;
438
439 down_write(&bmap->b_sem);
440 ret = nilfs_bmap_dirty(bmap);
441 nilfs_bmap_clear_dirty(bmap);
442 up_write(&bmap->b_sem);
443 return ret;
444}
445
446
447/*
448 * Internal use only
449 */
450__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
451 const struct buffer_head *bh)
452{
453 struct buffer_head *pbh;
454 __u64 key;
455
456 key = page_index(bh->b_page) << (PAGE_SHIFT -
457 bmap->b_inode->i_blkbits);
458 for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
459 key++;
460
461 return key;
462}
463
464__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
465{
466 __s64 diff;
467
468 diff = key - bmap->b_last_allocated_key;
469 if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
470 (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
471 (bmap->b_last_allocated_ptr + diff > 0))
472 return bmap->b_last_allocated_ptr + diff;
473 else
474 return NILFS_BMAP_INVALID_PTR;
475}
476
477#define NILFS_BMAP_GROUP_DIV 8
478__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
479{
480 struct inode *dat = nilfs_bmap_get_dat(bmap);
481 unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
482 unsigned long group = bmap->b_inode->i_ino / entries_per_group;
483
484 return group * entries_per_group +
485 (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
486 (entries_per_group / NILFS_BMAP_GROUP_DIV);
487}
488
489static struct lock_class_key nilfs_bmap_dat_lock_key;
490static struct lock_class_key nilfs_bmap_mdt_lock_key;
491
492/**
493 * nilfs_bmap_read - read a bmap from an inode
494 * @bmap: bmap
495 * @raw_inode: on-disk inode
496 *
497 * Description: nilfs_bmap_read() initializes the bmap @bmap.
498 *
499 * Return Value: On success, 0 is returned. On error, the following negative
500 * error code is returned.
501 *
502 * %-ENOMEM - Insufficient amount of memory available.
503 */
504int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
505{
506 if (raw_inode == NULL)
507 memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
508 else
509 memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
510
511 init_rwsem(&bmap->b_sem);
512 bmap->b_state = 0;
513 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
514 switch (bmap->b_inode->i_ino) {
515 case NILFS_DAT_INO:
516 bmap->b_ptr_type = NILFS_BMAP_PTR_P;
517 bmap->b_last_allocated_key = 0;
518 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
519 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
520 break;
521 case NILFS_CPFILE_INO:
522 case NILFS_SUFILE_INO:
523 bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
524 bmap->b_last_allocated_key = 0;
525 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
526 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
527 break;
528 case NILFS_IFILE_INO:
529 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
530 fallthrough;
531 default:
532 bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
533 bmap->b_last_allocated_key = 0;
534 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
535 break;
536 }
537
538 return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
539 nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
540}
541
542/**
543 * nilfs_bmap_write - write back a bmap to an inode
544 * @bmap: bmap
545 * @raw_inode: on-disk inode
546 *
547 * Description: nilfs_bmap_write() stores @bmap in @raw_inode.
548 */
549void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
550{
551 down_write(&bmap->b_sem);
552 memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
553 NILFS_INODE_BMAP_SIZE * sizeof(__le64));
554 if (bmap->b_inode->i_ino == NILFS_DAT_INO)
555 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
556
557 up_write(&bmap->b_sem);
558}
559
560void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
561{
562 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
563 init_rwsem(&bmap->b_sem);
564 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
565 bmap->b_ptr_type = NILFS_BMAP_PTR_U;
566 bmap->b_last_allocated_key = 0;
567 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
568 bmap->b_state = 0;
569 nilfs_btree_init_gc(bmap);
570}
571
572void nilfs_bmap_save(const struct nilfs_bmap *bmap,
573 struct nilfs_bmap_store *store)
574{
575 memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
576 store->last_allocated_key = bmap->b_last_allocated_key;
577 store->last_allocated_ptr = bmap->b_last_allocated_ptr;
578 store->state = bmap->b_state;
579}
580
581void nilfs_bmap_restore(struct nilfs_bmap *bmap,
582 const struct nilfs_bmap_store *store)
583{
584 memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
585 bmap->b_last_allocated_key = store->last_allocated_key;
586 bmap->b_last_allocated_ptr = store->last_allocated_ptr;
587 bmap->b_state = store->state;
588}
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 "btree.h"
29#include "direct.h"
30#include "btnode.h"
31#include "mdt.h"
32#include "dat.h"
33#include "alloc.h"
34
35struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
36{
37 struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info;
38
39 return nilfs->ns_dat;
40}
41
42static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap,
43 const char *fname, int err)
44{
45 struct inode *inode = bmap->b_inode;
46
47 if (err == -EINVAL) {
48 nilfs_error(inode->i_sb, fname,
49 "broken bmap (inode number=%lu)\n", inode->i_ino);
50 err = -EIO;
51 }
52 return err;
53}
54
55/**
56 * nilfs_bmap_lookup_at_level - find a data block or node block
57 * @bmap: bmap
58 * @key: key
59 * @level: level
60 * @ptrp: place to store the value associated to @key
61 *
62 * Description: nilfs_bmap_lookup_at_level() finds a record whose key
63 * matches @key in the block at @level of the bmap.
64 *
65 * Return Value: On success, 0 is returned and the record associated with @key
66 * is stored in the place pointed by @ptrp. On error, one of the following
67 * negative error codes is returned.
68 *
69 * %-EIO - I/O error.
70 *
71 * %-ENOMEM - Insufficient amount of memory available.
72 *
73 * %-ENOENT - A record associated with @key does not exist.
74 */
75int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
76 __u64 *ptrp)
77{
78 sector_t blocknr;
79 int ret;
80
81 down_read(&bmap->b_sem);
82 ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
83 if (ret < 0) {
84 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
85 goto out;
86 }
87 if (NILFS_BMAP_USE_VBN(bmap)) {
88 ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
89 &blocknr);
90 if (!ret)
91 *ptrp = blocknr;
92 }
93
94 out:
95 up_read(&bmap->b_sem);
96 return ret;
97}
98
99int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
100 unsigned maxblocks)
101{
102 int ret;
103
104 down_read(&bmap->b_sem);
105 ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
106 up_read(&bmap->b_sem);
107
108 return nilfs_bmap_convert_error(bmap, __func__, ret);
109}
110
111static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
112{
113 __u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
114 __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
115 int ret, n;
116
117 if (bmap->b_ops->bop_check_insert != NULL) {
118 ret = bmap->b_ops->bop_check_insert(bmap, key);
119 if (ret > 0) {
120 n = bmap->b_ops->bop_gather_data(
121 bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
122 if (n < 0)
123 return n;
124 ret = nilfs_btree_convert_and_insert(
125 bmap, key, ptr, keys, ptrs, n);
126 if (ret == 0)
127 bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
128
129 return ret;
130 } else if (ret < 0)
131 return ret;
132 }
133
134 return bmap->b_ops->bop_insert(bmap, key, ptr);
135}
136
137/**
138 * nilfs_bmap_insert - insert a new key-record pair into a bmap
139 * @bmap: bmap
140 * @key: key
141 * @rec: record
142 *
143 * Description: nilfs_bmap_insert() inserts the new key-record pair specified
144 * by @key and @rec into @bmap.
145 *
146 * Return Value: On success, 0 is returned. On error, one of the following
147 * negative error codes is returned.
148 *
149 * %-EIO - I/O error.
150 *
151 * %-ENOMEM - Insufficient amount of memory available.
152 *
153 * %-EEXIST - A record associated with @key already exist.
154 */
155int nilfs_bmap_insert(struct nilfs_bmap *bmap,
156 unsigned long key,
157 unsigned long rec)
158{
159 int ret;
160
161 down_write(&bmap->b_sem);
162 ret = nilfs_bmap_do_insert(bmap, key, rec);
163 up_write(&bmap->b_sem);
164
165 return nilfs_bmap_convert_error(bmap, __func__, ret);
166}
167
168static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
169{
170 __u64 keys[NILFS_BMAP_LARGE_LOW + 1];
171 __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
172 int ret, n;
173
174 if (bmap->b_ops->bop_check_delete != NULL) {
175 ret = bmap->b_ops->bop_check_delete(bmap, key);
176 if (ret > 0) {
177 n = bmap->b_ops->bop_gather_data(
178 bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
179 if (n < 0)
180 return n;
181 ret = nilfs_direct_delete_and_convert(
182 bmap, key, keys, ptrs, n);
183 if (ret == 0)
184 bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
185
186 return ret;
187 } else if (ret < 0)
188 return ret;
189 }
190
191 return bmap->b_ops->bop_delete(bmap, key);
192}
193
194int nilfs_bmap_last_key(struct nilfs_bmap *bmap, unsigned long *key)
195{
196 __u64 lastkey;
197 int ret;
198
199 down_read(&bmap->b_sem);
200 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
201 up_read(&bmap->b_sem);
202
203 if (ret < 0)
204 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
205 else
206 *key = lastkey;
207 return ret;
208}
209
210/**
211 * nilfs_bmap_delete - delete a key-record pair from a bmap
212 * @bmap: bmap
213 * @key: key
214 *
215 * Description: nilfs_bmap_delete() deletes the key-record pair specified by
216 * @key from @bmap.
217 *
218 * Return Value: On success, 0 is returned. On error, one of the following
219 * negative error codes is returned.
220 *
221 * %-EIO - I/O error.
222 *
223 * %-ENOMEM - Insufficient amount of memory available.
224 *
225 * %-ENOENT - A record associated with @key does not exist.
226 */
227int nilfs_bmap_delete(struct nilfs_bmap *bmap, unsigned long key)
228{
229 int ret;
230
231 down_write(&bmap->b_sem);
232 ret = nilfs_bmap_do_delete(bmap, key);
233 up_write(&bmap->b_sem);
234
235 return nilfs_bmap_convert_error(bmap, __func__, ret);
236}
237
238static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, unsigned long key)
239{
240 __u64 lastkey;
241 int ret;
242
243 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
244 if (ret < 0) {
245 if (ret == -ENOENT)
246 ret = 0;
247 return ret;
248 }
249
250 while (key <= lastkey) {
251 ret = nilfs_bmap_do_delete(bmap, lastkey);
252 if (ret < 0)
253 return ret;
254 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
255 if (ret < 0) {
256 if (ret == -ENOENT)
257 ret = 0;
258 return ret;
259 }
260 }
261 return 0;
262}
263
264/**
265 * nilfs_bmap_truncate - truncate a bmap to a specified key
266 * @bmap: bmap
267 * @key: key
268 *
269 * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
270 * greater than or equal to @key from @bmap.
271 *
272 * Return Value: On success, 0 is returned. On error, one of the following
273 * negative error codes is returned.
274 *
275 * %-EIO - I/O error.
276 *
277 * %-ENOMEM - Insufficient amount of memory available.
278 */
279int nilfs_bmap_truncate(struct nilfs_bmap *bmap, unsigned long key)
280{
281 int ret;
282
283 down_write(&bmap->b_sem);
284 ret = nilfs_bmap_do_truncate(bmap, key);
285 up_write(&bmap->b_sem);
286
287 return nilfs_bmap_convert_error(bmap, __func__, ret);
288}
289
290/**
291 * nilfs_bmap_clear - free resources a bmap holds
292 * @bmap: bmap
293 *
294 * Description: nilfs_bmap_clear() frees resources associated with @bmap.
295 */
296void nilfs_bmap_clear(struct nilfs_bmap *bmap)
297{
298 down_write(&bmap->b_sem);
299 if (bmap->b_ops->bop_clear != NULL)
300 bmap->b_ops->bop_clear(bmap);
301 up_write(&bmap->b_sem);
302}
303
304/**
305 * nilfs_bmap_propagate - propagate dirty state
306 * @bmap: bmap
307 * @bh: buffer head
308 *
309 * Description: nilfs_bmap_propagate() marks the buffers that directly or
310 * indirectly refer to the block specified by @bh dirty.
311 *
312 * Return Value: On success, 0 is returned. On error, one of the following
313 * negative error codes is returned.
314 *
315 * %-EIO - I/O error.
316 *
317 * %-ENOMEM - Insufficient amount of memory available.
318 */
319int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
320{
321 int ret;
322
323 down_write(&bmap->b_sem);
324 ret = bmap->b_ops->bop_propagate(bmap, bh);
325 up_write(&bmap->b_sem);
326
327 return nilfs_bmap_convert_error(bmap, __func__, ret);
328}
329
330/**
331 * nilfs_bmap_lookup_dirty_buffers -
332 * @bmap: bmap
333 * @listp: pointer to buffer head list
334 */
335void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
336 struct list_head *listp)
337{
338 if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
339 bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);
340}
341
342/**
343 * nilfs_bmap_assign - assign a new block number to a block
344 * @bmap: bmap
345 * @bhp: pointer to buffer head
346 * @blocknr: block number
347 * @binfo: block information
348 *
349 * Description: nilfs_bmap_assign() assigns the block number @blocknr to the
350 * buffer specified by @bh.
351 *
352 * Return Value: On success, 0 is returned and the buffer head of a newly
353 * create buffer and the block information associated with the buffer are
354 * stored in the place pointed by @bh and @binfo, respectively. On error, one
355 * of the following negative error codes is returned.
356 *
357 * %-EIO - I/O error.
358 *
359 * %-ENOMEM - Insufficient amount of memory available.
360 */
361int nilfs_bmap_assign(struct nilfs_bmap *bmap,
362 struct buffer_head **bh,
363 unsigned long blocknr,
364 union nilfs_binfo *binfo)
365{
366 int ret;
367
368 down_write(&bmap->b_sem);
369 ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo);
370 up_write(&bmap->b_sem);
371
372 return nilfs_bmap_convert_error(bmap, __func__, ret);
373}
374
375/**
376 * nilfs_bmap_mark - mark block dirty
377 * @bmap: bmap
378 * @key: key
379 * @level: level
380 *
381 * Description: nilfs_bmap_mark() marks the block specified by @key and @level
382 * as dirty.
383 *
384 * Return Value: On success, 0 is returned. On error, one of the following
385 * negative error codes is returned.
386 *
387 * %-EIO - I/O error.
388 *
389 * %-ENOMEM - Insufficient amount of memory available.
390 */
391int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
392{
393 int ret;
394
395 if (bmap->b_ops->bop_mark == NULL)
396 return 0;
397
398 down_write(&bmap->b_sem);
399 ret = bmap->b_ops->bop_mark(bmap, key, level);
400 up_write(&bmap->b_sem);
401
402 return nilfs_bmap_convert_error(bmap, __func__, ret);
403}
404
405/**
406 * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
407 * @bmap: bmap
408 *
409 * Description: nilfs_test_and_clear() is the atomic operation to test and
410 * clear the dirty state of @bmap.
411 *
412 * Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
413 */
414int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
415{
416 int ret;
417
418 down_write(&bmap->b_sem);
419 ret = nilfs_bmap_dirty(bmap);
420 nilfs_bmap_clear_dirty(bmap);
421 up_write(&bmap->b_sem);
422 return ret;
423}
424
425
426/*
427 * Internal use only
428 */
429__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
430 const struct buffer_head *bh)
431{
432 struct buffer_head *pbh;
433 __u64 key;
434
435 key = page_index(bh->b_page) << (PAGE_CACHE_SHIFT -
436 bmap->b_inode->i_blkbits);
437 for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
438 key++;
439
440 return key;
441}
442
443__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
444{
445 __s64 diff;
446
447 diff = key - bmap->b_last_allocated_key;
448 if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
449 (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
450 (bmap->b_last_allocated_ptr + diff > 0))
451 return bmap->b_last_allocated_ptr + diff;
452 else
453 return NILFS_BMAP_INVALID_PTR;
454}
455
456#define NILFS_BMAP_GROUP_DIV 8
457__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
458{
459 struct inode *dat = nilfs_bmap_get_dat(bmap);
460 unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
461 unsigned long group = bmap->b_inode->i_ino / entries_per_group;
462
463 return group * entries_per_group +
464 (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
465 (entries_per_group / NILFS_BMAP_GROUP_DIV);
466}
467
468static struct lock_class_key nilfs_bmap_dat_lock_key;
469static struct lock_class_key nilfs_bmap_mdt_lock_key;
470
471/**
472 * nilfs_bmap_read - read a bmap from an inode
473 * @bmap: bmap
474 * @raw_inode: on-disk inode
475 *
476 * Description: nilfs_bmap_read() initializes the bmap @bmap.
477 *
478 * Return Value: On success, 0 is returned. On error, the following negative
479 * error code is returned.
480 *
481 * %-ENOMEM - Insufficient amount of memory available.
482 */
483int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
484{
485 if (raw_inode == NULL)
486 memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
487 else
488 memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
489
490 init_rwsem(&bmap->b_sem);
491 bmap->b_state = 0;
492 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
493 switch (bmap->b_inode->i_ino) {
494 case NILFS_DAT_INO:
495 bmap->b_ptr_type = NILFS_BMAP_PTR_P;
496 bmap->b_last_allocated_key = 0;
497 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
498 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
499 break;
500 case NILFS_CPFILE_INO:
501 case NILFS_SUFILE_INO:
502 bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
503 bmap->b_last_allocated_key = 0;
504 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
505 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
506 break;
507 case NILFS_IFILE_INO:
508 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
509 /* Fall through */
510 default:
511 bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
512 bmap->b_last_allocated_key = 0;
513 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
514 break;
515 }
516
517 return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
518 nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
519}
520
521/**
522 * nilfs_bmap_write - write back a bmap to an inode
523 * @bmap: bmap
524 * @raw_inode: on-disk inode
525 *
526 * Description: nilfs_bmap_write() stores @bmap in @raw_inode.
527 */
528void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
529{
530 down_write(&bmap->b_sem);
531 memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
532 NILFS_INODE_BMAP_SIZE * sizeof(__le64));
533 if (bmap->b_inode->i_ino == NILFS_DAT_INO)
534 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
535
536 up_write(&bmap->b_sem);
537}
538
539void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
540{
541 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
542 init_rwsem(&bmap->b_sem);
543 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
544 bmap->b_ptr_type = NILFS_BMAP_PTR_U;
545 bmap->b_last_allocated_key = 0;
546 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
547 bmap->b_state = 0;
548 nilfs_btree_init_gc(bmap);
549}
550
551void nilfs_bmap_save(const struct nilfs_bmap *bmap,
552 struct nilfs_bmap_store *store)
553{
554 memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
555 store->last_allocated_key = bmap->b_last_allocated_key;
556 store->last_allocated_ptr = bmap->b_last_allocated_ptr;
557 store->state = bmap->b_state;
558}
559
560void nilfs_bmap_restore(struct nilfs_bmap *bmap,
561 const struct nilfs_bmap_store *store)
562{
563 memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
564 bmap->b_last_allocated_key = store->last_allocated_key;
565 bmap->b_last_allocated_ptr = store->last_allocated_ptr;
566 bmap->b_state = store->state;
567}