1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/affs/file.c 4 * 5 * (c) 1996 Hans-Joachim Widmaier - Rewritten 6 * 7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. 8 * 9 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. 10 * 11 * (C) 1991 Linus Torvalds - minix filesystem 12 * 13 * affs regular file handling primitives 14 */ 15 16 #include <linux/uio.h> 17 #include <linux/blkdev.h> 18 #include <linux/mpage.h> 19 #include "affs.h" 20 21 static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext); 22 23 static int 24 affs_file_open(struct inode *inode, struct file *filp) 25 { 26 pr_debug("open(%lu,%d)\n", 27 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); 28 atomic_inc(&AFFS_I(inode)->i_opencnt); 29 return 0; 30 } 31 32 static int 33 affs_file_release(struct inode *inode, struct file *filp) 34 { 35 pr_debug("release(%lu, %d)\n", 36 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); 37 38 if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) { 39 inode_lock(inode); 40 if (inode->i_size != AFFS_I(inode)->mmu_private) 41 affs_truncate(inode); 42 affs_free_prealloc(inode); 43 inode_unlock(inode); 44 } 45 46 return 0; 47 } 48 49 static int 50 affs_grow_extcache(struct inode *inode, u32 lc_idx) 51 { 52 struct super_block *sb = inode->i_sb; 53 struct buffer_head *bh; 54 u32 lc_max; 55 int i, j, key; 56 57 if (!AFFS_I(inode)->i_lc) { 58 char *ptr = (char *)get_zeroed_page(GFP_NOFS); 59 if (!ptr) 60 return -ENOMEM; 61 AFFS_I(inode)->i_lc = (u32 *)ptr; 62 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2); 63 } 64 65 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift; 66 67 if (AFFS_I(inode)->i_extcnt > lc_max) { 68 u32 lc_shift, lc_mask, tmp, off; 69 70 /* need to recalculate linear cache, start from old size */ 71 lc_shift = AFFS_I(inode)->i_lc_shift; 72 tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift; 73 for (; tmp; tmp >>= 1) 74 lc_shift++; 75 lc_mask = (1 << lc_shift) - 1; 76 77 /* fix idx and old size to new shift */ 78 lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift); 79 AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift); 80 81 /* first shrink old cache to make more space */ 82 off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift); 83 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off) 84 AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j]; 85 86 AFFS_I(inode)->i_lc_shift = lc_shift; 87 AFFS_I(inode)->i_lc_mask = lc_mask; 88 } 89 90 /* fill cache to the needed index */ 91 i = AFFS_I(inode)->i_lc_size; 92 AFFS_I(inode)->i_lc_size = lc_idx + 1; 93 for (; i <= lc_idx; i++) { 94 if (!i) { 95 AFFS_I(inode)->i_lc[0] = inode->i_ino; 96 continue; 97 } 98 key = AFFS_I(inode)->i_lc[i - 1]; 99 j = AFFS_I(inode)->i_lc_mask + 1; 100 // unlock cache 101 for (; j > 0; j--) { 102 bh = affs_bread(sb, key); 103 if (!bh) 104 goto err; 105 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); 106 affs_brelse(bh); 107 } 108 // lock cache 109 AFFS_I(inode)->i_lc[i] = key; 110 } 111 112 return 0; 113 114 err: 115 // lock cache 116 return -EIO; 117 } 118 119 static struct buffer_head * 120 affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext) 121 { 122 struct super_block *sb = inode->i_sb; 123 struct buffer_head *new_bh; 124 u32 blocknr, tmp; 125 126 blocknr = affs_alloc_block(inode, bh->b_blocknr); 127 if (!blocknr) 128 return ERR_PTR(-ENOSPC); 129 130 new_bh = affs_getzeroblk(sb, blocknr); 131 if (!new_bh) { 132 affs_free_block(sb, blocknr); 133 return ERR_PTR(-EIO); 134 } 135 136 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST); 137 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr); 138 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE); 139 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino); 140 affs_fix_checksum(sb, new_bh); 141 142 mark_buffer_dirty_inode(new_bh, inode); 143 144 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); 145 if (tmp) 146 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp); 147 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr); 148 affs_adjust_checksum(bh, blocknr - tmp); 149 mark_buffer_dirty_inode(bh, inode); 150 151 AFFS_I(inode)->i_extcnt++; 152 mark_inode_dirty(inode); 153 154 return new_bh; 155 } 156 157 static inline struct buffer_head * 158 affs_get_extblock(struct inode *inode, u32 ext) 159 { 160 /* inline the simplest case: same extended block as last time */ 161 struct buffer_head *bh = AFFS_I(inode)->i_ext_bh; 162 if (ext == AFFS_I(inode)->i_ext_last) 163 get_bh(bh); 164 else 165 /* we have to do more (not inlined) */ 166 bh = affs_get_extblock_slow(inode, ext); 167 168 return bh; 169 } 170 171 static struct buffer_head * 172 affs_get_extblock_slow(struct inode *inode, u32 ext) 173 { 174 struct super_block *sb = inode->i_sb; 175 struct buffer_head *bh; 176 u32 ext_key; 177 u32 lc_idx, lc_off, ac_idx; 178 u32 tmp, idx; 179 180 if (ext == AFFS_I(inode)->i_ext_last + 1) { 181 /* read the next extended block from the current one */ 182 bh = AFFS_I(inode)->i_ext_bh; 183 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); 184 if (ext < AFFS_I(inode)->i_extcnt) 185 goto read_ext; 186 BUG_ON(ext > AFFS_I(inode)->i_extcnt); 187 bh = affs_alloc_extblock(inode, bh, ext); 188 if (IS_ERR(bh)) 189 return bh; 190 goto store_ext; 191 } 192 193 if (ext == 0) { 194 /* we seek back to the file header block */ 195 ext_key = inode->i_ino; 196 goto read_ext; 197 } 198 199 if (ext >= AFFS_I(inode)->i_extcnt) { 200 struct buffer_head *prev_bh; 201 202 /* allocate a new extended block */ 203 BUG_ON(ext > AFFS_I(inode)->i_extcnt); 204 205 /* get previous extended block */ 206 prev_bh = affs_get_extblock(inode, ext - 1); 207 if (IS_ERR(prev_bh)) 208 return prev_bh; 209 bh = affs_alloc_extblock(inode, prev_bh, ext); 210 affs_brelse(prev_bh); 211 if (IS_ERR(bh)) 212 return bh; 213 goto store_ext; 214 } 215 216 again: 217 /* check if there is an extended cache and whether it's large enough */ 218 lc_idx = ext >> AFFS_I(inode)->i_lc_shift; 219 lc_off = ext & AFFS_I(inode)->i_lc_mask; 220 221 if (lc_idx >= AFFS_I(inode)->i_lc_size) { 222 int err; 223 224 err = affs_grow_extcache(inode, lc_idx); 225 if (err) 226 return ERR_PTR(err); 227 goto again; 228 } 229 230 /* every n'th key we find in the linear cache */ 231 if (!lc_off) { 232 ext_key = AFFS_I(inode)->i_lc[lc_idx]; 233 goto read_ext; 234 } 235 236 /* maybe it's still in the associative cache */ 237 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK; 238 if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) { 239 ext_key = AFFS_I(inode)->i_ac[ac_idx].key; 240 goto read_ext; 241 } 242 243 /* try to find one of the previous extended blocks */ 244 tmp = ext; 245 idx = ac_idx; 246 while (--tmp, --lc_off > 0) { 247 idx = (idx - 1) & AFFS_AC_MASK; 248 if (AFFS_I(inode)->i_ac[idx].ext == tmp) { 249 ext_key = AFFS_I(inode)->i_ac[idx].key; 250 goto find_ext; 251 } 252 } 253 254 /* fall back to the linear cache */ 255 ext_key = AFFS_I(inode)->i_lc[lc_idx]; 256 find_ext: 257 /* read all extended blocks until we find the one we need */ 258 //unlock cache 259 do { 260 bh = affs_bread(sb, ext_key); 261 if (!bh) 262 goto err_bread; 263 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); 264 affs_brelse(bh); 265 tmp++; 266 } while (tmp < ext); 267 //lock cache 268 269 /* store it in the associative cache */ 270 // recalculate ac_idx? 271 AFFS_I(inode)->i_ac[ac_idx].ext = ext; 272 AFFS_I(inode)->i_ac[ac_idx].key = ext_key; 273 274 read_ext: 275 /* finally read the right extended block */ 276 //unlock cache 277 bh = affs_bread(sb, ext_key); 278 if (!bh) 279 goto err_bread; 280 //lock cache 281 282 store_ext: 283 /* release old cached extended block and store the new one */ 284 affs_brelse(AFFS_I(inode)->i_ext_bh); 285 AFFS_I(inode)->i_ext_last = ext; 286 AFFS_I(inode)->i_ext_bh = bh; 287 get_bh(bh); 288 289 return bh; 290 291 err_bread: 292 affs_brelse(bh); 293 return ERR_PTR(-EIO); 294 } 295 296 static int 297 affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) 298 { 299 struct super_block *sb = inode->i_sb; 300 struct buffer_head *ext_bh; 301 u32 ext; 302 303 pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino, 304 (unsigned long long)block); 305 306 BUG_ON(block > (sector_t)0x7fffffffUL); 307 308 if (block >= AFFS_I(inode)->i_blkcnt) { 309 if (block > AFFS_I(inode)->i_blkcnt || !create) 310 goto err_big; 311 } else 312 create = 0; 313 314 //lock cache 315 affs_lock_ext(inode); 316 317 ext = (u32)block / AFFS_SB(sb)->s_hashsize; 318 block -= ext * AFFS_SB(sb)->s_hashsize; 319 ext_bh = affs_get_extblock(inode, ext); 320 if (IS_ERR(ext_bh)) 321 goto err_ext; 322 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); 323 324 if (create) { 325 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); 326 if (!blocknr) 327 goto err_alloc; 328 set_buffer_new(bh_result); 329 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize; 330 AFFS_I(inode)->i_blkcnt++; 331 332 /* store new block */ 333 if (bh_result->b_blocknr) 334 affs_warning(sb, "get_block", 335 "block already set (%llx)", 336 (unsigned long long)bh_result->b_blocknr); 337 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); 338 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1); 339 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1); 340 bh_result->b_blocknr = blocknr; 341 342 if (!block) { 343 /* insert first block into header block */ 344 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data); 345 if (tmp) 346 affs_warning(sb, "get_block", "first block already set (%d)", tmp); 347 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr); 348 affs_adjust_checksum(ext_bh, blocknr - tmp); 349 } 350 } 351 352 affs_brelse(ext_bh); 353 //unlock cache 354 affs_unlock_ext(inode); 355 return 0; 356 357 err_big: 358 affs_error(inode->i_sb, "get_block", "strange block request %llu", 359 (unsigned long long)block); 360 return -EIO; 361 err_ext: 362 // unlock cache 363 affs_unlock_ext(inode); 364 return PTR_ERR(ext_bh); 365 err_alloc: 366 brelse(ext_bh); 367 clear_buffer_mapped(bh_result); 368 bh_result->b_bdev = NULL; 369 // unlock cache 370 affs_unlock_ext(inode); 371 return -ENOSPC; 372 } 373 374 static int affs_writepages(struct address_space *mapping, 375 struct writeback_control *wbc) 376 { 377 return mpage_writepages(mapping, wbc, affs_get_block); 378 } 379 380 static int affs_read_folio(struct file *file, struct folio *folio) 381 { 382 return block_read_full_folio(folio, affs_get_block); 383 } 384 385 static void affs_write_failed(struct address_space *mapping, loff_t to) 386 { 387 struct inode *inode = mapping->host; 388 389 if (to > inode->i_size) { 390 truncate_pagecache(inode, inode->i_size); 391 affs_truncate(inode); 392 } 393 } 394 395 static ssize_t 396 affs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 397 { 398 struct file *file = iocb->ki_filp; 399 struct address_space *mapping = file->f_mapping; 400 struct inode *inode = mapping->host; 401 size_t count = iov_iter_count(iter); 402 loff_t offset = iocb->ki_pos; 403 ssize_t ret; 404 405 if (iov_iter_rw(iter) == WRITE) { 406 loff_t size = offset + count; 407 408 if (AFFS_I(inode)->mmu_private < size) 409 return 0; 410 } 411 412 ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block); 413 if (ret < 0 && iov_iter_rw(iter) == WRITE) 414 affs_write_failed(mapping, offset + count); 415 return ret; 416 } 417 418 static int affs_write_begin(struct file *file, struct address_space *mapping, 419 loff_t pos, unsigned len, 420 struct folio **foliop, void **fsdata) 421 { 422 int ret; 423 424 ret = cont_write_begin(file, mapping, pos, len, foliop, fsdata, 425 affs_get_block, 426 &AFFS_I(mapping->host)->mmu_private); 427 if (unlikely(ret)) 428 affs_write_failed(mapping, pos + len); 429 430 return ret; 431 } 432 433 static int affs_write_end(struct file *file, struct address_space *mapping, 434 loff_t pos, unsigned int len, unsigned int copied, 435 struct folio *folio, void *fsdata) 436 { 437 struct inode *inode = mapping->host; 438 int ret; 439 440 ret = generic_write_end(file, mapping, pos, len, copied, folio, fsdata); 441 442 /* Clear Archived bit on file writes, as AmigaOS would do */ 443 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) { 444 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED; 445 mark_inode_dirty(inode); 446 } 447 448 return ret; 449 } 450 451 static sector_t _affs_bmap(struct address_space *mapping, sector_t block) 452 { 453 return generic_block_bmap(mapping,block,affs_get_block); 454 } 455 456 const struct address_space_operations affs_aops = { 457 .dirty_folio = block_dirty_folio, 458 .invalidate_folio = block_invalidate_folio, 459 .read_folio = affs_read_folio, 460 .writepages = affs_writepages, 461 .write_begin = affs_write_begin, 462 .write_end = affs_write_end, 463 .direct_IO = affs_direct_IO, 464 .migrate_folio = buffer_migrate_folio, 465 .bmap = _affs_bmap 466 }; 467 468 static inline struct buffer_head * 469 affs_bread_ino(struct inode *inode, int block, int create) 470 { 471 struct buffer_head *bh, tmp_bh; 472 int err; 473 474 tmp_bh.b_state = 0; 475 err = affs_get_block(inode, block, &tmp_bh, create); 476 if (!err) { 477 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr); 478 if (bh) { 479 bh->b_state |= tmp_bh.b_state; 480 return bh; 481 } 482 err = -EIO; 483 } 484 return ERR_PTR(err); 485 } 486 487 static inline struct buffer_head * 488 affs_getzeroblk_ino(struct inode *inode, int block) 489 { 490 struct buffer_head *bh, tmp_bh; 491 int err; 492 493 tmp_bh.b_state = 0; 494 err = affs_get_block(inode, block, &tmp_bh, 1); 495 if (!err) { 496 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr); 497 if (bh) { 498 bh->b_state |= tmp_bh.b_state; 499 return bh; 500 } 501 err = -EIO; 502 } 503 return ERR_PTR(err); 504 } 505 506 static inline struct buffer_head * 507 affs_getemptyblk_ino(struct inode *inode, int block) 508 { 509 struct buffer_head *bh, tmp_bh; 510 int err; 511 512 tmp_bh.b_state = 0; 513 err = affs_get_block(inode, block, &tmp_bh, 1); 514 if (!err) { 515 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr); 516 if (bh) { 517 bh->b_state |= tmp_bh.b_state; 518 return bh; 519 } 520 err = -EIO; 521 } 522 return ERR_PTR(err); 523 } 524 525 static int affs_do_read_folio_ofs(struct folio *folio, size_t to, int create) 526 { 527 struct inode *inode = folio->mapping->host; 528 struct super_block *sb = inode->i_sb; 529 struct buffer_head *bh; 530 size_t pos = 0; 531 size_t bidx, boff, bsize; 532 u32 tmp; 533 534 pr_debug("%s(%lu, %ld, 0, %zu)\n", __func__, inode->i_ino, 535 folio->index, to); 536 BUG_ON(to > folio_size(folio)); 537 bsize = AFFS_SB(sb)->s_data_blksize; 538 tmp = folio_pos(folio); 539 bidx = tmp / bsize; 540 boff = tmp % bsize; 541 542 while (pos < to) { 543 bh = affs_bread_ino(inode, bidx, create); 544 if (IS_ERR(bh)) 545 return PTR_ERR(bh); 546 tmp = min(bsize - boff, to - pos); 547 BUG_ON(pos + tmp > to || tmp > bsize); 548 memcpy_to_folio(folio, pos, AFFS_DATA(bh) + boff, tmp); 549 affs_brelse(bh); 550 bidx++; 551 pos += tmp; 552 boff = 0; 553 } 554 return 0; 555 } 556 557 static int 558 affs_extent_file_ofs(struct inode *inode, u32 newsize) 559 { 560 struct super_block *sb = inode->i_sb; 561 struct buffer_head *bh, *prev_bh; 562 u32 bidx, boff; 563 u32 size, bsize; 564 u32 tmp; 565 566 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize); 567 bsize = AFFS_SB(sb)->s_data_blksize; 568 bh = NULL; 569 size = AFFS_I(inode)->mmu_private; 570 bidx = size / bsize; 571 boff = size % bsize; 572 if (boff) { 573 bh = affs_bread_ino(inode, bidx, 0); 574 if (IS_ERR(bh)) 575 return PTR_ERR(bh); 576 tmp = min(bsize - boff, newsize - size); 577 BUG_ON(boff + tmp > bsize || tmp > bsize); 578 memset(AFFS_DATA(bh) + boff, 0, tmp); 579 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); 580 affs_fix_checksum(sb, bh); 581 mark_buffer_dirty_inode(bh, inode); 582 size += tmp; 583 bidx++; 584 } else if (bidx) { 585 bh = affs_bread_ino(inode, bidx - 1, 0); 586 if (IS_ERR(bh)) 587 return PTR_ERR(bh); 588 } 589 590 while (size < newsize) { 591 prev_bh = bh; 592 bh = affs_getzeroblk_ino(inode, bidx); 593 if (IS_ERR(bh)) 594 goto out; 595 tmp = min(bsize, newsize - size); 596 BUG_ON(tmp > bsize); 597 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); 598 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); 599 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); 600 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); 601 affs_fix_checksum(sb, bh); 602 bh->b_state &= ~(1UL << BH_New); 603 mark_buffer_dirty_inode(bh, inode); 604 if (prev_bh) { 605 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); 606 607 if (tmp_next) 608 affs_warning(sb, "extent_file_ofs", 609 "next block already set for %d (%d)", 610 bidx, tmp_next); 611 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); 612 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); 613 mark_buffer_dirty_inode(prev_bh, inode); 614 affs_brelse(prev_bh); 615 } 616 size += bsize; 617 bidx++; 618 } 619 affs_brelse(bh); 620 inode->i_size = AFFS_I(inode)->mmu_private = newsize; 621 return 0; 622 623 out: 624 inode->i_size = AFFS_I(inode)->mmu_private = newsize; 625 return PTR_ERR(bh); 626 } 627 628 static int affs_read_folio_ofs(struct file *file, struct folio *folio) 629 { 630 struct inode *inode = folio->mapping->host; 631 size_t to; 632 int err; 633 634 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, folio->index); 635 to = folio_size(folio); 636 if (folio_pos(folio) + to > inode->i_size) { 637 to = inode->i_size - folio_pos(folio); 638 folio_zero_segment(folio, to, folio_size(folio)); 639 } 640 641 err = affs_do_read_folio_ofs(folio, to, 0); 642 if (!err) 643 folio_mark_uptodate(folio); 644 folio_unlock(folio); 645 return err; 646 } 647 648 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping, 649 loff_t pos, unsigned len, 650 struct folio **foliop, void **fsdata) 651 { 652 struct inode *inode = mapping->host; 653 struct folio *folio; 654 pgoff_t index; 655 int err = 0; 656 657 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, 658 pos + len); 659 if (pos > AFFS_I(inode)->mmu_private) { 660 /* XXX: this probably leaves a too-big i_size in case of 661 * failure. Should really be updating i_size at write_end time 662 */ 663 err = affs_extent_file_ofs(inode, pos); 664 if (err) 665 return err; 666 } 667 668 index = pos >> PAGE_SHIFT; 669 folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN, 670 mapping_gfp_mask(mapping)); 671 if (IS_ERR(folio)) 672 return PTR_ERR(folio); 673 *foliop = folio; 674 675 if (folio_test_uptodate(folio)) 676 return 0; 677 678 /* XXX: inefficient but safe in the face of short writes */ 679 err = affs_do_read_folio_ofs(folio, folio_size(folio), 1); 680 if (err) { 681 folio_unlock(folio); 682 folio_put(folio); 683 } 684 return err; 685 } 686 687 static int affs_write_end_ofs(struct file *file, struct address_space *mapping, 688 loff_t pos, unsigned len, unsigned copied, 689 struct folio *folio, void *fsdata) 690 { 691 struct inode *inode = mapping->host; 692 struct super_block *sb = inode->i_sb; 693 struct buffer_head *bh, *prev_bh; 694 char *data; 695 u32 bidx, boff, bsize; 696 unsigned from, to; 697 u32 tmp; 698 int written; 699 700 from = pos & (PAGE_SIZE - 1); 701 to = from + len; 702 /* 703 * XXX: not sure if this can handle short copies (len < copied), but 704 * we don't have to, because the folio should always be uptodate here, 705 * due to write_begin. 706 */ 707 708 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, 709 pos + len); 710 bsize = AFFS_SB(sb)->s_data_blksize; 711 data = folio_address(folio); 712 713 bh = NULL; 714 written = 0; 715 tmp = (folio->index << PAGE_SHIFT) + from; 716 bidx = tmp / bsize; 717 boff = tmp % bsize; 718 if (boff) { 719 bh = affs_bread_ino(inode, bidx, 0); 720 if (IS_ERR(bh)) { 721 written = PTR_ERR(bh); 722 goto err_first_bh; 723 } 724 tmp = min(bsize - boff, to - from); 725 BUG_ON(boff + tmp > bsize || tmp > bsize); 726 memcpy(AFFS_DATA(bh) + boff, data + from, tmp); 727 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); 728 affs_fix_checksum(sb, bh); 729 mark_buffer_dirty_inode(bh, inode); 730 written += tmp; 731 from += tmp; 732 bidx++; 733 } else if (bidx) { 734 bh = affs_bread_ino(inode, bidx - 1, 0); 735 if (IS_ERR(bh)) { 736 written = PTR_ERR(bh); 737 goto err_first_bh; 738 } 739 } 740 while (from + bsize <= to) { 741 prev_bh = bh; 742 bh = affs_getemptyblk_ino(inode, bidx); 743 if (IS_ERR(bh)) 744 goto err_bh; 745 memcpy(AFFS_DATA(bh), data + from, bsize); 746 if (buffer_new(bh)) { 747 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); 748 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); 749 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); 750 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize); 751 AFFS_DATA_HEAD(bh)->next = 0; 752 bh->b_state &= ~(1UL << BH_New); 753 if (prev_bh) { 754 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); 755 756 if (tmp_next) 757 affs_warning(sb, "commit_write_ofs", 758 "next block already set for %d (%d)", 759 bidx, tmp_next); 760 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); 761 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); 762 mark_buffer_dirty_inode(prev_bh, inode); 763 } 764 } 765 affs_brelse(prev_bh); 766 affs_fix_checksum(sb, bh); 767 mark_buffer_dirty_inode(bh, inode); 768 written += bsize; 769 from += bsize; 770 bidx++; 771 } 772 if (from < to) { 773 prev_bh = bh; 774 bh = affs_bread_ino(inode, bidx, 1); 775 if (IS_ERR(bh)) 776 goto err_bh; 777 tmp = min(bsize, to - from); 778 BUG_ON(tmp > bsize); 779 memcpy(AFFS_DATA(bh), data + from, tmp); 780 if (buffer_new(bh)) { 781 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); 782 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); 783 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); 784 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); 785 AFFS_DATA_HEAD(bh)->next = 0; 786 bh->b_state &= ~(1UL << BH_New); 787 if (prev_bh) { 788 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); 789 790 if (tmp_next) 791 affs_warning(sb, "commit_write_ofs", 792 "next block already set for %d (%d)", 793 bidx, tmp_next); 794 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); 795 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); 796 mark_buffer_dirty_inode(prev_bh, inode); 797 } 798 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp) 799 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); 800 affs_brelse(prev_bh); 801 affs_fix_checksum(sb, bh); 802 mark_buffer_dirty_inode(bh, inode); 803 written += tmp; 804 from += tmp; 805 bidx++; 806 } 807 folio_mark_uptodate(folio); 808 809 done: 810 affs_brelse(bh); 811 tmp = (folio->index << PAGE_SHIFT) + from; 812 if (tmp > inode->i_size) 813 inode->i_size = AFFS_I(inode)->mmu_private = tmp; 814 815 /* Clear Archived bit on file writes, as AmigaOS would do */ 816 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) { 817 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED; 818 mark_inode_dirty(inode); 819 } 820 821 err_first_bh: 822 folio_unlock(folio); 823 folio_put(folio); 824 825 return written; 826 827 err_bh: 828 bh = prev_bh; 829 if (!written) 830 written = PTR_ERR(bh); 831 goto done; 832 } 833 834 const struct address_space_operations affs_aops_ofs = { 835 .dirty_folio = block_dirty_folio, 836 .invalidate_folio = block_invalidate_folio, 837 .read_folio = affs_read_folio_ofs, 838 //.writepages = affs_writepages_ofs, 839 .write_begin = affs_write_begin_ofs, 840 .write_end = affs_write_end_ofs, 841 .migrate_folio = filemap_migrate_folio, 842 }; 843 844 /* Free any preallocated blocks. */ 845 846 void 847 affs_free_prealloc(struct inode *inode) 848 { 849 struct super_block *sb = inode->i_sb; 850 851 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino); 852 853 while (AFFS_I(inode)->i_pa_cnt) { 854 AFFS_I(inode)->i_pa_cnt--; 855 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc); 856 } 857 } 858 859 /* Truncate (or enlarge) a file to the requested size. */ 860 861 void 862 affs_truncate(struct inode *inode) 863 { 864 struct super_block *sb = inode->i_sb; 865 u32 ext, ext_key; 866 u32 last_blk, blkcnt, blk; 867 u32 size; 868 struct buffer_head *ext_bh; 869 int i; 870 871 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n", 872 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size); 873 874 last_blk = 0; 875 ext = 0; 876 if (inode->i_size) { 877 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize; 878 ext = last_blk / AFFS_SB(sb)->s_hashsize; 879 } 880 881 if (inode->i_size > AFFS_I(inode)->mmu_private) { 882 struct address_space *mapping = inode->i_mapping; 883 struct folio *folio; 884 void *fsdata = NULL; 885 loff_t isize = inode->i_size; 886 int res; 887 888 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, &folio, &fsdata); 889 if (!res) 890 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, folio, fsdata); 891 else 892 inode->i_size = AFFS_I(inode)->mmu_private; 893 mark_inode_dirty(inode); 894 return; 895 } else if (inode->i_size == AFFS_I(inode)->mmu_private) 896 return; 897 898 // lock cache 899 ext_bh = affs_get_extblock(inode, ext); 900 if (IS_ERR(ext_bh)) { 901 affs_warning(sb, "truncate", 902 "unexpected read error for ext block %u (%ld)", 903 ext, PTR_ERR(ext_bh)); 904 return; 905 } 906 if (AFFS_I(inode)->i_lc) { 907 /* clear linear cache */ 908 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift; 909 if (AFFS_I(inode)->i_lc_size > i) { 910 AFFS_I(inode)->i_lc_size = i; 911 for (; i < AFFS_LC_SIZE; i++) 912 AFFS_I(inode)->i_lc[i] = 0; 913 } 914 /* clear associative cache */ 915 for (i = 0; i < AFFS_AC_SIZE; i++) 916 if (AFFS_I(inode)->i_ac[i].ext >= ext) 917 AFFS_I(inode)->i_ac[i].ext = 0; 918 } 919 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); 920 921 blkcnt = AFFS_I(inode)->i_blkcnt; 922 i = 0; 923 blk = last_blk; 924 if (inode->i_size) { 925 i = last_blk % AFFS_SB(sb)->s_hashsize + 1; 926 blk++; 927 } else 928 AFFS_HEAD(ext_bh)->first_data = 0; 929 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i); 930 size = AFFS_SB(sb)->s_hashsize; 931 if (size > blkcnt - blk + i) 932 size = blkcnt - blk + i; 933 for (; i < size; i++, blk++) { 934 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); 935 AFFS_BLOCK(sb, ext_bh, i) = 0; 936 } 937 AFFS_TAIL(sb, ext_bh)->extension = 0; 938 affs_fix_checksum(sb, ext_bh); 939 mark_buffer_dirty_inode(ext_bh, inode); 940 affs_brelse(ext_bh); 941 942 if (inode->i_size) { 943 AFFS_I(inode)->i_blkcnt = last_blk + 1; 944 AFFS_I(inode)->i_extcnt = ext + 1; 945 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) { 946 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); 947 u32 tmp; 948 if (IS_ERR(bh)) { 949 affs_warning(sb, "truncate", 950 "unexpected read error for last block %u (%ld)", 951 ext, PTR_ERR(bh)); 952 return; 953 } 954 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next); 955 AFFS_DATA_HEAD(bh)->next = 0; 956 affs_adjust_checksum(bh, -tmp); 957 affs_brelse(bh); 958 } 959 } else { 960 AFFS_I(inode)->i_blkcnt = 0; 961 AFFS_I(inode)->i_extcnt = 1; 962 } 963 AFFS_I(inode)->mmu_private = inode->i_size; 964 // unlock cache 965 966 while (ext_key) { 967 ext_bh = affs_bread(sb, ext_key); 968 size = AFFS_SB(sb)->s_hashsize; 969 if (size > blkcnt - blk) 970 size = blkcnt - blk; 971 for (i = 0; i < size; i++, blk++) 972 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); 973 affs_free_block(sb, ext_key); 974 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); 975 affs_brelse(ext_bh); 976 } 977 affs_free_prealloc(inode); 978 } 979 980 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) 981 { 982 struct inode *inode = filp->f_mapping->host; 983 int ret, err; 984 985 err = file_write_and_wait_range(filp, start, end); 986 if (err) 987 return err; 988 989 inode_lock(inode); 990 ret = write_inode_now(inode, 0); 991 err = sync_blockdev(inode->i_sb->s_bdev); 992 if (!ret) 993 ret = err; 994 inode_unlock(inode); 995 return ret; 996 } 997 const struct file_operations affs_file_operations = { 998 .llseek = generic_file_llseek, 999 .read_iter = generic_file_read_iter, 1000 .write_iter = generic_file_write_iter, 1001 .mmap = generic_file_mmap, 1002 .open = affs_file_open, 1003 .release = affs_file_release, 1004 .fsync = affs_file_fsync, 1005 .splice_read = filemap_splice_read, 1006 }; 1007 1008 const struct inode_operations affs_file_inode_operations = { 1009 .setattr = affs_notify_change, 1010 }; 1011