1 /* 2 * linux/fs/ufs/balloc.c 3 * 4 * Copyright (C) 1998 5 * Daniel Pirkl <daniel.pirkl@email.cz> 6 * Charles University, Faculty of Mathematics and Physics 7 * 8 * UFS2 write support Evgeniy Dushistov <dushistov@mail.ru>, 2007 9 */ 10 11 #include <linux/fs.h> 12 #include <linux/stat.h> 13 #include <linux/time.h> 14 #include <linux/string.h> 15 #include <linux/buffer_head.h> 16 #include <linux/capability.h> 17 #include <linux/bitops.h> 18 #include <asm/byteorder.h> 19 20 #include "ufs_fs.h" 21 #include "ufs.h" 22 #include "swab.h" 23 #include "util.h" 24 25 #define INVBLOCK ((u64)-1L) 26 27 static u64 ufs_add_fragments(struct inode *, u64, unsigned, unsigned); 28 static u64 ufs_alloc_fragments(struct inode *, unsigned, u64, unsigned, int *); 29 static u64 ufs_alloccg_block(struct inode *, struct ufs_cg_private_info *, u64, int *); 30 static u64 ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, u64, unsigned); 31 static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[]; 32 static void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int); 33 34 /* 35 * Free 'count' fragments from fragment number 'fragment' 36 */ 37 void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count) 38 { 39 struct super_block * sb; 40 struct ufs_sb_private_info * uspi; 41 struct ufs_cg_private_info * ucpi; 42 struct ufs_cylinder_group * ucg; 43 unsigned cgno, bit, end_bit, bbase, blkmap, i; 44 u64 blkno; 45 46 sb = inode->i_sb; 47 uspi = UFS_SB(sb)->s_uspi; 48 49 UFSD("ENTER, fragment %llu, count %u\n", 50 (unsigned long long)fragment, count); 51 52 if (ufs_fragnum(fragment) + count > uspi->s_fpg) 53 ufs_error (sb, "ufs_free_fragments", "internal error"); 54 55 mutex_lock(&UFS_SB(sb)->s_lock); 56 57 cgno = ufs_dtog(uspi, fragment); 58 bit = ufs_dtogd(uspi, fragment); 59 if (cgno >= uspi->s_ncg) { 60 ufs_panic (sb, "ufs_free_fragments", "freeing blocks are outside device"); 61 goto failed; 62 } 63 64 ucpi = ufs_load_cylinder (sb, cgno); 65 if (!ucpi) 66 goto failed; 67 ucg = ubh_get_ucg (UCPI_UBH(ucpi)); 68 if (!ufs_cg_chkmagic(sb, ucg)) { 69 ufs_panic (sb, "ufs_free_fragments", "internal error, bad magic number on cg %u", cgno); 70 goto failed; 71 } 72 73 end_bit = bit + count; 74 bbase = ufs_blknum (bit); 75 blkmap = ubh_blkmap (UCPI_UBH(ucpi), ucpi->c_freeoff, bbase); 76 ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1); 77 for (i = bit; i < end_bit; i++) { 78 if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, i)) 79 ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, i); 80 else 81 ufs_error (sb, "ufs_free_fragments", 82 "bit already cleared for fragment %u", i); 83 } 84 85 fs32_add(sb, &ucg->cg_cs.cs_nffree, count); 86 uspi->cs_total.cs_nffree += count; 87 fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); 88 blkmap = ubh_blkmap (UCPI_UBH(ucpi), ucpi->c_freeoff, bbase); 89 ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1); 90 91 /* 92 * Trying to reassemble free fragments into block 93 */ 94 blkno = ufs_fragstoblks (bbase); 95 if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno)) { 96 fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb); 97 uspi->cs_total.cs_nffree -= uspi->s_fpb; 98 fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb); 99 if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) 100 ufs_clusteracct (sb, ucpi, blkno, 1); 101 fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); 102 uspi->cs_total.cs_nbfree++; 103 fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); 104 if (uspi->fs_magic != UFS2_MAGIC) { 105 unsigned cylno = ufs_cbtocylno (bbase); 106 107 fs16_add(sb, &ubh_cg_blks(ucpi, cylno, 108 ufs_cbtorpos(bbase)), 1); 109 fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); 110 } 111 } 112 113 ubh_mark_buffer_dirty (USPI_UBH(uspi)); 114 ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 115 if (sb->s_flags & MS_SYNCHRONOUS) 116 ubh_sync_block(UCPI_UBH(ucpi)); 117 ufs_mark_sb_dirty(sb); 118 119 mutex_unlock(&UFS_SB(sb)->s_lock); 120 UFSD("EXIT\n"); 121 return; 122 123 failed: 124 mutex_unlock(&UFS_SB(sb)->s_lock); 125 UFSD("EXIT (FAILED)\n"); 126 return; 127 } 128 129 /* 130 * Free 'count' fragments from fragment number 'fragment' (free whole blocks) 131 */ 132 void ufs_free_blocks(struct inode *inode, u64 fragment, unsigned count) 133 { 134 struct super_block * sb; 135 struct ufs_sb_private_info * uspi; 136 struct ufs_cg_private_info * ucpi; 137 struct ufs_cylinder_group * ucg; 138 unsigned overflow, cgno, bit, end_bit, i; 139 u64 blkno; 140 141 sb = inode->i_sb; 142 uspi = UFS_SB(sb)->s_uspi; 143 144 UFSD("ENTER, fragment %llu, count %u\n", 145 (unsigned long long)fragment, count); 146 147 if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) { 148 ufs_error (sb, "ufs_free_blocks", "internal error, " 149 "fragment %llu, count %u\n", 150 (unsigned long long)fragment, count); 151 goto failed; 152 } 153 154 mutex_lock(&UFS_SB(sb)->s_lock); 155 156 do_more: 157 overflow = 0; 158 cgno = ufs_dtog(uspi, fragment); 159 bit = ufs_dtogd(uspi, fragment); 160 if (cgno >= uspi->s_ncg) { 161 ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device"); 162 goto failed_unlock; 163 } 164 end_bit = bit + count; 165 if (end_bit > uspi->s_fpg) { 166 overflow = bit + count - uspi->s_fpg; 167 count -= overflow; 168 end_bit -= overflow; 169 } 170 171 ucpi = ufs_load_cylinder (sb, cgno); 172 if (!ucpi) 173 goto failed_unlock; 174 ucg = ubh_get_ucg (UCPI_UBH(ucpi)); 175 if (!ufs_cg_chkmagic(sb, ucg)) { 176 ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno); 177 goto failed_unlock; 178 } 179 180 for (i = bit; i < end_bit; i += uspi->s_fpb) { 181 blkno = ufs_fragstoblks(i); 182 if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno)) { 183 ufs_error(sb, "ufs_free_blocks", "freeing free fragment"); 184 } 185 ubh_setblock(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno); 186 if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) 187 ufs_clusteracct (sb, ucpi, blkno, 1); 188 189 fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); 190 uspi->cs_total.cs_nbfree++; 191 fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); 192 193 if (uspi->fs_magic != UFS2_MAGIC) { 194 unsigned cylno = ufs_cbtocylno(i); 195 196 fs16_add(sb, &ubh_cg_blks(ucpi, cylno, 197 ufs_cbtorpos(i)), 1); 198 fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); 199 } 200 } 201 202 ubh_mark_buffer_dirty (USPI_UBH(uspi)); 203 ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 204 if (sb->s_flags & MS_SYNCHRONOUS) 205 ubh_sync_block(UCPI_UBH(ucpi)); 206 207 if (overflow) { 208 fragment += count; 209 count = overflow; 210 goto do_more; 211 } 212 213 ufs_mark_sb_dirty(sb); 214 mutex_unlock(&UFS_SB(sb)->s_lock); 215 UFSD("EXIT\n"); 216 return; 217 218 failed_unlock: 219 mutex_unlock(&UFS_SB(sb)->s_lock); 220 failed: 221 UFSD("EXIT (FAILED)\n"); 222 return; 223 } 224 225 /* 226 * Modify inode page cache in such way: 227 * have - blocks with b_blocknr equal to oldb...oldb+count-1 228 * get - blocks with b_blocknr equal to newb...newb+count-1 229 * also we suppose that oldb...oldb+count-1 blocks 230 * situated at the end of file. 231 * 232 * We can come here from ufs_writepage or ufs_prepare_write, 233 * locked_page is argument of these functions, so we already lock it. 234 */ 235 static void ufs_change_blocknr(struct inode *inode, sector_t beg, 236 unsigned int count, sector_t oldb, 237 sector_t newb, struct page *locked_page) 238 { 239 const unsigned blks_per_page = 240 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits); 241 const unsigned mask = blks_per_page - 1; 242 struct address_space * const mapping = inode->i_mapping; 243 pgoff_t index, cur_index, last_index; 244 unsigned pos, j, lblock; 245 sector_t end, i; 246 struct page *page; 247 struct buffer_head *head, *bh; 248 249 UFSD("ENTER, ino %lu, count %u, oldb %llu, newb %llu\n", 250 inode->i_ino, count, 251 (unsigned long long)oldb, (unsigned long long)newb); 252 253 BUG_ON(!locked_page); 254 BUG_ON(!PageLocked(locked_page)); 255 256 cur_index = locked_page->index; 257 end = count + beg; 258 last_index = end >> (PAGE_CACHE_SHIFT - inode->i_blkbits); 259 for (i = beg; i < end; i = (i | mask) + 1) { 260 index = i >> (PAGE_CACHE_SHIFT - inode->i_blkbits); 261 262 if (likely(cur_index != index)) { 263 page = ufs_get_locked_page(mapping, index); 264 if (!page)/* it was truncated */ 265 continue; 266 if (IS_ERR(page)) {/* or EIO */ 267 ufs_error(inode->i_sb, __func__, 268 "read of page %llu failed\n", 269 (unsigned long long)index); 270 continue; 271 } 272 } else 273 page = locked_page; 274 275 head = page_buffers(page); 276 bh = head; 277 pos = i & mask; 278 for (j = 0; j < pos; ++j) 279 bh = bh->b_this_page; 280 281 282 if (unlikely(index == last_index)) 283 lblock = end & mask; 284 else 285 lblock = blks_per_page; 286 287 do { 288 if (j >= lblock) 289 break; 290 pos = (i - beg) + j; 291 292 if (!buffer_mapped(bh)) 293 map_bh(bh, inode->i_sb, oldb + pos); 294 if (!buffer_uptodate(bh)) { 295 ll_rw_block(READ, 1, &bh); 296 wait_on_buffer(bh); 297 if (!buffer_uptodate(bh)) { 298 ufs_error(inode->i_sb, __func__, 299 "read of block failed\n"); 300 break; 301 } 302 } 303 304 UFSD(" change from %llu to %llu, pos %u\n", 305 (unsigned long long)(pos + oldb), 306 (unsigned long long)(pos + newb), pos); 307 308 bh->b_blocknr = newb + pos; 309 unmap_underlying_metadata(bh->b_bdev, 310 bh->b_blocknr); 311 mark_buffer_dirty(bh); 312 ++j; 313 bh = bh->b_this_page; 314 } while (bh != head); 315 316 if (likely(cur_index != index)) 317 ufs_put_locked_page(page); 318 } 319 UFSD("EXIT\n"); 320 } 321 322 static void ufs_clear_frags(struct inode *inode, sector_t beg, unsigned int n, 323 int sync) 324 { 325 struct buffer_head *bh; 326 sector_t end = beg + n; 327 328 for (; beg < end; ++beg) { 329 bh = sb_getblk(inode->i_sb, beg); 330 lock_buffer(bh); 331 memset(bh->b_data, 0, inode->i_sb->s_blocksize); 332 set_buffer_uptodate(bh); 333 mark_buffer_dirty(bh); 334 unlock_buffer(bh); 335 if (IS_SYNC(inode) || sync) 336 sync_dirty_buffer(bh); 337 brelse(bh); 338 } 339 } 340 341 u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment, 342 u64 goal, unsigned count, int *err, 343 struct page *locked_page) 344 { 345 struct super_block * sb; 346 struct ufs_sb_private_info * uspi; 347 struct ufs_super_block_first * usb1; 348 unsigned cgno, oldcount, newcount; 349 u64 tmp, request, result; 350 351 UFSD("ENTER, ino %lu, fragment %llu, goal %llu, count %u\n", 352 inode->i_ino, (unsigned long long)fragment, 353 (unsigned long long)goal, count); 354 355 sb = inode->i_sb; 356 uspi = UFS_SB(sb)->s_uspi; 357 usb1 = ubh_get_usb_first(uspi); 358 *err = -ENOSPC; 359 360 mutex_lock(&UFS_SB(sb)->s_lock); 361 tmp = ufs_data_ptr_to_cpu(sb, p); 362 363 if (count + ufs_fragnum(fragment) > uspi->s_fpb) { 364 ufs_warning(sb, "ufs_new_fragments", "internal warning" 365 " fragment %llu, count %u", 366 (unsigned long long)fragment, count); 367 count = uspi->s_fpb - ufs_fragnum(fragment); 368 } 369 oldcount = ufs_fragnum (fragment); 370 newcount = oldcount + count; 371 372 /* 373 * Somebody else has just allocated our fragments 374 */ 375 if (oldcount) { 376 if (!tmp) { 377 ufs_error(sb, "ufs_new_fragments", "internal error, " 378 "fragment %llu, tmp %llu\n", 379 (unsigned long long)fragment, 380 (unsigned long long)tmp); 381 mutex_unlock(&UFS_SB(sb)->s_lock); 382 return INVBLOCK; 383 } 384 if (fragment < UFS_I(inode)->i_lastfrag) { 385 UFSD("EXIT (ALREADY ALLOCATED)\n"); 386 mutex_unlock(&UFS_SB(sb)->s_lock); 387 return 0; 388 } 389 } 390 else { 391 if (tmp) { 392 UFSD("EXIT (ALREADY ALLOCATED)\n"); 393 mutex_unlock(&UFS_SB(sb)->s_lock); 394 return 0; 395 } 396 } 397 398 /* 399 * There is not enough space for user on the device 400 */ 401 if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(uspi, UFS_MINFREE) <= 0) { 402 mutex_unlock(&UFS_SB(sb)->s_lock); 403 UFSD("EXIT (FAILED)\n"); 404 return 0; 405 } 406 407 if (goal >= uspi->s_size) 408 goal = 0; 409 if (goal == 0) 410 cgno = ufs_inotocg (inode->i_ino); 411 else 412 cgno = ufs_dtog(uspi, goal); 413 414 /* 415 * allocate new fragment 416 */ 417 if (oldcount == 0) { 418 result = ufs_alloc_fragments (inode, cgno, goal, count, err); 419 if (result) { 420 ufs_cpu_to_data_ptr(sb, p, result); 421 *err = 0; 422 UFS_I(inode)->i_lastfrag = 423 max(UFS_I(inode)->i_lastfrag, fragment + count); 424 ufs_clear_frags(inode, result + oldcount, 425 newcount - oldcount, locked_page != NULL); 426 } 427 mutex_unlock(&UFS_SB(sb)->s_lock); 428 UFSD("EXIT, result %llu\n", (unsigned long long)result); 429 return result; 430 } 431 432 /* 433 * resize block 434 */ 435 result = ufs_add_fragments(inode, tmp, oldcount, newcount); 436 if (result) { 437 *err = 0; 438 UFS_I(inode)->i_lastfrag = max(UFS_I(inode)->i_lastfrag, 439 fragment + count); 440 ufs_clear_frags(inode, result + oldcount, newcount - oldcount, 441 locked_page != NULL); 442 mutex_unlock(&UFS_SB(sb)->s_lock); 443 UFSD("EXIT, result %llu\n", (unsigned long long)result); 444 return result; 445 } 446 447 /* 448 * allocate new block and move data 449 */ 450 switch (fs32_to_cpu(sb, usb1->fs_optim)) { 451 case UFS_OPTSPACE: 452 request = newcount; 453 if (uspi->s_minfree < 5 || uspi->cs_total.cs_nffree 454 > uspi->s_dsize * uspi->s_minfree / (2 * 100)) 455 break; 456 usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); 457 break; 458 default: 459 usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); 460 461 case UFS_OPTTIME: 462 request = uspi->s_fpb; 463 if (uspi->cs_total.cs_nffree < uspi->s_dsize * 464 (uspi->s_minfree - 2) / 100) 465 break; 466 usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); 467 break; 468 } 469 result = ufs_alloc_fragments (inode, cgno, goal, request, err); 470 if (result) { 471 ufs_clear_frags(inode, result + oldcount, newcount - oldcount, 472 locked_page != NULL); 473 ufs_change_blocknr(inode, fragment - oldcount, oldcount, 474 uspi->s_sbbase + tmp, 475 uspi->s_sbbase + result, locked_page); 476 ufs_cpu_to_data_ptr(sb, p, result); 477 *err = 0; 478 UFS_I(inode)->i_lastfrag = max(UFS_I(inode)->i_lastfrag, 479 fragment + count); 480 mutex_unlock(&UFS_SB(sb)->s_lock); 481 if (newcount < request) 482 ufs_free_fragments (inode, result + newcount, request - newcount); 483 ufs_free_fragments (inode, tmp, oldcount); 484 UFSD("EXIT, result %llu\n", (unsigned long long)result); 485 return result; 486 } 487 488 mutex_unlock(&UFS_SB(sb)->s_lock); 489 UFSD("EXIT (FAILED)\n"); 490 return 0; 491 } 492 493 static u64 ufs_add_fragments(struct inode *inode, u64 fragment, 494 unsigned oldcount, unsigned newcount) 495 { 496 struct super_block * sb; 497 struct ufs_sb_private_info * uspi; 498 struct ufs_cg_private_info * ucpi; 499 struct ufs_cylinder_group * ucg; 500 unsigned cgno, fragno, fragoff, count, fragsize, i; 501 502 UFSD("ENTER, fragment %llu, oldcount %u, newcount %u\n", 503 (unsigned long long)fragment, oldcount, newcount); 504 505 sb = inode->i_sb; 506 uspi = UFS_SB(sb)->s_uspi; 507 count = newcount - oldcount; 508 509 cgno = ufs_dtog(uspi, fragment); 510 if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count) 511 return 0; 512 if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb) 513 return 0; 514 ucpi = ufs_load_cylinder (sb, cgno); 515 if (!ucpi) 516 return 0; 517 ucg = ubh_get_ucg (UCPI_UBH(ucpi)); 518 if (!ufs_cg_chkmagic(sb, ucg)) { 519 ufs_panic (sb, "ufs_add_fragments", 520 "internal error, bad magic number on cg %u", cgno); 521 return 0; 522 } 523 524 fragno = ufs_dtogd(uspi, fragment); 525 fragoff = ufs_fragnum (fragno); 526 for (i = oldcount; i < newcount; i++) 527 if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i)) 528 return 0; 529 /* 530 * Block can be extended 531 */ 532 ucg->cg_time = cpu_to_fs32(sb, get_seconds()); 533 for (i = newcount; i < (uspi->s_fpb - fragoff); i++) 534 if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i)) 535 break; 536 fragsize = i - oldcount; 537 if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize])) 538 ufs_panic (sb, "ufs_add_fragments", 539 "internal error or corrupted bitmap on cg %u", cgno); 540 fs32_sub(sb, &ucg->cg_frsum[fragsize], 1); 541 if (fragsize != count) 542 fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1); 543 for (i = oldcount; i < newcount; i++) 544 ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i); 545 546 fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); 547 fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); 548 uspi->cs_total.cs_nffree -= count; 549 550 ubh_mark_buffer_dirty (USPI_UBH(uspi)); 551 ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 552 if (sb->s_flags & MS_SYNCHRONOUS) 553 ubh_sync_block(UCPI_UBH(ucpi)); 554 ufs_mark_sb_dirty(sb); 555 556 UFSD("EXIT, fragment %llu\n", (unsigned long long)fragment); 557 558 return fragment; 559 } 560 561 #define UFS_TEST_FREE_SPACE_CG \ 562 ucg = (struct ufs_cylinder_group *) UFS_SB(sb)->s_ucg[cgno]->b_data; \ 563 if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree)) \ 564 goto cg_found; \ 565 for (k = count; k < uspi->s_fpb; k++) \ 566 if (fs32_to_cpu(sb, ucg->cg_frsum[k])) \ 567 goto cg_found; 568 569 static u64 ufs_alloc_fragments(struct inode *inode, unsigned cgno, 570 u64 goal, unsigned count, int *err) 571 { 572 struct super_block * sb; 573 struct ufs_sb_private_info * uspi; 574 struct ufs_cg_private_info * ucpi; 575 struct ufs_cylinder_group * ucg; 576 unsigned oldcg, i, j, k, allocsize; 577 u64 result; 578 579 UFSD("ENTER, ino %lu, cgno %u, goal %llu, count %u\n", 580 inode->i_ino, cgno, (unsigned long long)goal, count); 581 582 sb = inode->i_sb; 583 uspi = UFS_SB(sb)->s_uspi; 584 oldcg = cgno; 585 586 /* 587 * 1. searching on preferred cylinder group 588 */ 589 UFS_TEST_FREE_SPACE_CG 590 591 /* 592 * 2. quadratic rehash 593 */ 594 for (j = 1; j < uspi->s_ncg; j *= 2) { 595 cgno += j; 596 if (cgno >= uspi->s_ncg) 597 cgno -= uspi->s_ncg; 598 UFS_TEST_FREE_SPACE_CG 599 } 600 601 /* 602 * 3. brute force search 603 * We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step ) 604 */ 605 cgno = (oldcg + 1) % uspi->s_ncg; 606 for (j = 2; j < uspi->s_ncg; j++) { 607 cgno++; 608 if (cgno >= uspi->s_ncg) 609 cgno = 0; 610 UFS_TEST_FREE_SPACE_CG 611 } 612 613 UFSD("EXIT (FAILED)\n"); 614 return 0; 615 616 cg_found: 617 ucpi = ufs_load_cylinder (sb, cgno); 618 if (!ucpi) 619 return 0; 620 ucg = ubh_get_ucg (UCPI_UBH(ucpi)); 621 if (!ufs_cg_chkmagic(sb, ucg)) 622 ufs_panic (sb, "ufs_alloc_fragments", 623 "internal error, bad magic number on cg %u", cgno); 624 ucg->cg_time = cpu_to_fs32(sb, get_seconds()); 625 626 if (count == uspi->s_fpb) { 627 result = ufs_alloccg_block (inode, ucpi, goal, err); 628 if (result == INVBLOCK) 629 return 0; 630 goto succed; 631 } 632 633 for (allocsize = count; allocsize < uspi->s_fpb; allocsize++) 634 if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0) 635 break; 636 637 if (allocsize == uspi->s_fpb) { 638 result = ufs_alloccg_block (inode, ucpi, goal, err); 639 if (result == INVBLOCK) 640 return 0; 641 goal = ufs_dtogd(uspi, result); 642 for (i = count; i < uspi->s_fpb; i++) 643 ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, goal + i); 644 i = uspi->s_fpb - count; 645 646 fs32_add(sb, &ucg->cg_cs.cs_nffree, i); 647 uspi->cs_total.cs_nffree += i; 648 fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i); 649 fs32_add(sb, &ucg->cg_frsum[i], 1); 650 goto succed; 651 } 652 653 result = ufs_bitmap_search (sb, ucpi, goal, allocsize); 654 if (result == INVBLOCK) 655 return 0; 656 for (i = 0; i < count; i++) 657 ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, result + i); 658 659 fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); 660 uspi->cs_total.cs_nffree -= count; 661 fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); 662 fs32_sub(sb, &ucg->cg_frsum[allocsize], 1); 663 664 if (count != allocsize) 665 fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1); 666 667 succed: 668 ubh_mark_buffer_dirty (USPI_UBH(uspi)); 669 ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); 670 if (sb->s_flags & MS_SYNCHRONOUS) 671 ubh_sync_block(UCPI_UBH(ucpi)); 672 ufs_mark_sb_dirty(sb); 673 674 result += cgno * uspi->s_fpg; 675 UFSD("EXIT3, result %llu\n", (unsigned long long)result); 676 return result; 677 } 678 679 static u64 ufs_alloccg_block(struct inode *inode, 680 struct ufs_cg_private_info *ucpi, 681 u64 goal, int *err) 682 { 683 struct super_block * sb; 684 struct ufs_sb_private_info * uspi; 685 struct ufs_cylinder_group * ucg; 686 u64 result, blkno; 687 688 UFSD("ENTER, goal %llu\n", (unsigned long long)goal); 689 690 sb = inode->i_sb; 691 uspi = UFS_SB(sb)->s_uspi; 692 ucg = ubh_get_ucg(UCPI_UBH(ucpi)); 693 694 if (goal == 0) { 695 goal = ucpi->c_rotor; 696 goto norot; 697 } 698 goal = ufs_blknum (goal); 699 goal = ufs_dtogd(uspi, goal); 700 701 /* 702 * If the requested block is available, use it. 703 */ 704 if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, ufs_fragstoblks(goal))) { 705 result = goal; 706 goto gotit; 707 } 708 709 norot: 710 result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb); 711 if (result == INVBLOCK) 712 return INVBLOCK; 713 ucpi->c_rotor = result; 714 gotit: 715 blkno = ufs_fragstoblks(result); 716 ubh_clrblock (UCPI_UBH(ucpi), ucpi->c_freeoff, blkno); 717 if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) 718 ufs_clusteracct (sb, ucpi, blkno, -1); 719 720 fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1); 721 uspi->cs_total.cs_nbfree--; 722 fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1); 723 724 if (uspi->fs_magic != UFS2_MAGIC) { 725 unsigned cylno = ufs_cbtocylno((unsigned)result); 726 727 fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, 728 ufs_cbtorpos((unsigned)result)), 1); 729 fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1); 730 } 731 732 UFSD("EXIT, result %llu\n", (unsigned long long)result); 733 734 return result; 735 } 736 737 static unsigned ubh_scanc(struct ufs_sb_private_info *uspi, 738 struct ufs_buffer_head *ubh, 739 unsigned begin, unsigned size, 740 unsigned char *table, unsigned char mask) 741 { 742 unsigned rest, offset; 743 unsigned char *cp; 744 745 746 offset = begin & ~uspi->s_fmask; 747 begin >>= uspi->s_fshift; 748 for (;;) { 749 if ((offset + size) < uspi->s_fsize) 750 rest = size; 751 else 752 rest = uspi->s_fsize - offset; 753 size -= rest; 754 cp = ubh->bh[begin]->b_data + offset; 755 while ((table[*cp++] & mask) == 0 && --rest) 756 ; 757 if (rest || !size) 758 break; 759 begin++; 760 offset = 0; 761 } 762 return (size + rest); 763 } 764 765 /* 766 * Find a block of the specified size in the specified cylinder group. 767 * @sp: pointer to super block 768 * @ucpi: pointer to cylinder group info 769 * @goal: near which block we want find new one 770 * @count: specified size 771 */ 772 static u64 ufs_bitmap_search(struct super_block *sb, 773 struct ufs_cg_private_info *ucpi, 774 u64 goal, unsigned count) 775 { 776 /* 777 * Bit patterns for identifying fragments in the block map 778 * used as ((map & mask_arr) == want_arr) 779 */ 780 static const int mask_arr[9] = { 781 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff 782 }; 783 static const int want_arr[9] = { 784 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe 785 }; 786 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; 787 unsigned start, length, loc; 788 unsigned pos, want, blockmap, mask, end; 789 u64 result; 790 791 UFSD("ENTER, cg %u, goal %llu, count %u\n", ucpi->c_cgx, 792 (unsigned long long)goal, count); 793 794 if (goal) 795 start = ufs_dtogd(uspi, goal) >> 3; 796 else 797 start = ucpi->c_frotor >> 3; 798 799 length = ((uspi->s_fpg + 7) >> 3) - start; 800 loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff + start, length, 801 (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, 802 1 << (count - 1 + (uspi->s_fpb & 7))); 803 if (loc == 0) { 804 length = start + 1; 805 loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff, length, 806 (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : 807 ufs_fragtable_other, 808 1 << (count - 1 + (uspi->s_fpb & 7))); 809 if (loc == 0) { 810 ufs_error(sb, "ufs_bitmap_search", 811 "bitmap corrupted on cg %u, start %u," 812 " length %u, count %u, freeoff %u\n", 813 ucpi->c_cgx, start, length, count, 814 ucpi->c_freeoff); 815 return INVBLOCK; 816 } 817 start = 0; 818 } 819 result = (start + length - loc) << 3; 820 ucpi->c_frotor = result; 821 822 /* 823 * found the byte in the map 824 */ 825 826 for (end = result + 8; result < end; result += uspi->s_fpb) { 827 blockmap = ubh_blkmap(UCPI_UBH(ucpi), ucpi->c_freeoff, result); 828 blockmap <<= 1; 829 mask = mask_arr[count]; 830 want = want_arr[count]; 831 for (pos = 0; pos <= uspi->s_fpb - count; pos++) { 832 if ((blockmap & mask) == want) { 833 UFSD("EXIT, result %llu\n", 834 (unsigned long long)result); 835 return result + pos; 836 } 837 mask <<= 1; 838 want <<= 1; 839 } 840 } 841 842 ufs_error(sb, "ufs_bitmap_search", "block not in map on cg %u\n", 843 ucpi->c_cgx); 844 UFSD("EXIT (FAILED)\n"); 845 return INVBLOCK; 846 } 847 848 static void ufs_clusteracct(struct super_block * sb, 849 struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt) 850 { 851 struct ufs_sb_private_info * uspi; 852 int i, start, end, forw, back; 853 854 uspi = UFS_SB(sb)->s_uspi; 855 if (uspi->s_contigsumsize <= 0) 856 return; 857 858 if (cnt > 0) 859 ubh_setbit(UCPI_UBH(ucpi), ucpi->c_clusteroff, blkno); 860 else 861 ubh_clrbit(UCPI_UBH(ucpi), ucpi->c_clusteroff, blkno); 862 863 /* 864 * Find the size of the cluster going forward. 865 */ 866 start = blkno + 1; 867 end = start + uspi->s_contigsumsize; 868 if ( end >= ucpi->c_nclusterblks) 869 end = ucpi->c_nclusterblks; 870 i = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_clusteroff, end, start); 871 if (i > end) 872 i = end; 873 forw = i - start; 874 875 /* 876 * Find the size of the cluster going backward. 877 */ 878 start = blkno - 1; 879 end = start - uspi->s_contigsumsize; 880 if (end < 0 ) 881 end = -1; 882 i = ubh_find_last_zero_bit (UCPI_UBH(ucpi), ucpi->c_clusteroff, start, end); 883 if ( i < end) 884 i = end; 885 back = start - i; 886 887 /* 888 * Account for old cluster and the possibly new forward and 889 * back clusters. 890 */ 891 i = back + forw + 1; 892 if (i > uspi->s_contigsumsize) 893 i = uspi->s_contigsumsize; 894 fs32_add(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (i << 2)), cnt); 895 if (back > 0) 896 fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (back << 2)), cnt); 897 if (forw > 0) 898 fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (forw << 2)), cnt); 899 } 900 901 902 static unsigned char ufs_fragtable_8fpb[] = { 903 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, 904 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, 905 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, 906 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, 907 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, 908 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, 909 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, 910 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40, 911 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, 912 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, 913 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, 914 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, 915 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, 916 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12, 917 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C, 918 0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, 919 }; 920 921 static unsigned char ufs_fragtable_other[] = { 922 0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A, 923 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 924 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 925 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, 926 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 927 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 928 0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE, 929 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, 930 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 931 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 932 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, 933 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, 934 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, 935 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, 936 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, 937 0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A, 938 }; 939