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 memcpy(raw_inode->i_bmap, bmap->b_u.u_data, 552 NILFS_INODE_BMAP_SIZE * sizeof(__le64)); 553 if (bmap->b_inode->i_ino == NILFS_DAT_INO) 554 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT; 555} 556 557void nilfs_bmap_init_gc(struct nilfs_bmap *bmap) 558{ 559 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE); 560 init_rwsem(&bmap->b_sem); 561 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; 562 bmap->b_ptr_type = NILFS_BMAP_PTR_U; 563 bmap->b_last_allocated_key = 0; 564 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR; 565 bmap->b_state = 0; 566 nilfs_btree_init_gc(bmap); 567} 568 569void nilfs_bmap_save(const struct nilfs_bmap *bmap, 570 struct nilfs_bmap_store *store) 571{ 572 memcpy(store->data, bmap->b_u.u_data, sizeof(store->data)); 573 store->last_allocated_key = bmap->b_last_allocated_key; 574 store->last_allocated_ptr = bmap->b_last_allocated_ptr; 575 store->state = bmap->b_state; 576} 577 578void nilfs_bmap_restore(struct nilfs_bmap *bmap, 579 const struct nilfs_bmap_store *store) 580{ 581 memcpy(bmap->b_u.u_data, store->data, sizeof(store->data)); 582 bmap->b_last_allocated_key = store->last_allocated_key; 583 bmap->b_last_allocated_ptr = store->last_allocated_ptr; 584 bmap->b_state = store->state; 585} 586