Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/ufs_fs.h> |
| 11 | #include <linux/stat.h> |
| 12 | #include <linux/time.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/quotaops.h> |
| 15 | #include <linux/buffer_head.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame^] | 16 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/sched.h> |
| 18 | #include <linux/bitops.h> |
| 19 | #include <asm/byteorder.h> |
| 20 | |
| 21 | #include "swab.h" |
| 22 | #include "util.h" |
| 23 | |
| 24 | #undef UFS_BALLOC_DEBUG |
| 25 | |
| 26 | #ifdef UFS_BALLOC_DEBUG |
| 27 | #define UFSD(x) printk("(%s, %d), %s:", __FILE__, __LINE__, __FUNCTION__); printk x; |
| 28 | #else |
| 29 | #define UFSD(x) |
| 30 | #endif |
| 31 | |
| 32 | static unsigned ufs_add_fragments (struct inode *, unsigned, unsigned, unsigned, int *); |
| 33 | static unsigned ufs_alloc_fragments (struct inode *, unsigned, unsigned, unsigned, int *); |
| 34 | static unsigned ufs_alloccg_block (struct inode *, struct ufs_cg_private_info *, unsigned, int *); |
| 35 | static unsigned ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, unsigned, unsigned); |
| 36 | static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[]; |
| 37 | static void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int); |
| 38 | |
| 39 | /* |
| 40 | * Free 'count' fragments from fragment number 'fragment' |
| 41 | */ |
| 42 | void ufs_free_fragments (struct inode * inode, unsigned fragment, unsigned count) { |
| 43 | struct super_block * sb; |
| 44 | struct ufs_sb_private_info * uspi; |
| 45 | struct ufs_super_block_first * usb1; |
| 46 | struct ufs_cg_private_info * ucpi; |
| 47 | struct ufs_cylinder_group * ucg; |
| 48 | unsigned cgno, bit, end_bit, bbase, blkmap, i, blkno, cylno; |
| 49 | |
| 50 | sb = inode->i_sb; |
| 51 | uspi = UFS_SB(sb)->s_uspi; |
| 52 | usb1 = ubh_get_usb_first(USPI_UBH); |
| 53 | |
| 54 | UFSD(("ENTER, fragment %u, count %u\n", fragment, count)) |
| 55 | |
| 56 | if (ufs_fragnum(fragment) + count > uspi->s_fpg) |
| 57 | ufs_error (sb, "ufs_free_fragments", "internal error"); |
| 58 | |
| 59 | lock_super(sb); |
| 60 | |
| 61 | cgno = ufs_dtog(fragment); |
| 62 | bit = ufs_dtogd(fragment); |
| 63 | if (cgno >= uspi->s_ncg) { |
| 64 | ufs_panic (sb, "ufs_free_fragments", "freeing blocks are outside device"); |
| 65 | goto failed; |
| 66 | } |
| 67 | |
| 68 | ucpi = ufs_load_cylinder (sb, cgno); |
| 69 | if (!ucpi) |
| 70 | goto failed; |
| 71 | ucg = ubh_get_ucg (UCPI_UBH); |
| 72 | if (!ufs_cg_chkmagic(sb, ucg)) { |
| 73 | ufs_panic (sb, "ufs_free_fragments", "internal error, bad magic number on cg %u", cgno); |
| 74 | goto failed; |
| 75 | } |
| 76 | |
| 77 | end_bit = bit + count; |
| 78 | bbase = ufs_blknum (bit); |
| 79 | blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase); |
| 80 | ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1); |
| 81 | for (i = bit; i < end_bit; i++) { |
| 82 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, i)) |
| 83 | ubh_setbit (UCPI_UBH, ucpi->c_freeoff, i); |
| 84 | else ufs_error (sb, "ufs_free_fragments", |
| 85 | "bit already cleared for fragment %u", i); |
| 86 | } |
| 87 | |
| 88 | DQUOT_FREE_BLOCK (inode, count); |
| 89 | |
| 90 | |
| 91 | fs32_add(sb, &ucg->cg_cs.cs_nffree, count); |
| 92 | fs32_add(sb, &usb1->fs_cstotal.cs_nffree, count); |
| 93 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); |
| 94 | blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase); |
| 95 | ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1); |
| 96 | |
| 97 | /* |
| 98 | * Trying to reassemble free fragments into block |
| 99 | */ |
| 100 | blkno = ufs_fragstoblks (bbase); |
| 101 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) { |
| 102 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb); |
| 103 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, uspi->s_fpb); |
| 104 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb); |
| 105 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) |
| 106 | ufs_clusteracct (sb, ucpi, blkno, 1); |
| 107 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); |
| 108 | fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1); |
| 109 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); |
| 110 | cylno = ufs_cbtocylno (bbase); |
| 111 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(bbase)), 1); |
| 112 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); |
| 113 | } |
| 114 | |
| 115 | ubh_mark_buffer_dirty (USPI_UBH); |
| 116 | ubh_mark_buffer_dirty (UCPI_UBH); |
| 117 | if (sb->s_flags & MS_SYNCHRONOUS) { |
Jan Kara | 096125f | 2005-09-06 15:19:15 -0700 | [diff] [blame] | 118 | ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | ubh_wait_on_buffer (UCPI_UBH); |
| 120 | } |
| 121 | sb->s_dirt = 1; |
| 122 | |
| 123 | unlock_super (sb); |
| 124 | UFSD(("EXIT\n")) |
| 125 | return; |
| 126 | |
| 127 | failed: |
| 128 | unlock_super (sb); |
| 129 | UFSD(("EXIT (FAILED)\n")) |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Free 'count' fragments from fragment number 'fragment' (free whole blocks) |
| 135 | */ |
| 136 | void ufs_free_blocks (struct inode * inode, unsigned fragment, unsigned count) { |
| 137 | struct super_block * sb; |
| 138 | struct ufs_sb_private_info * uspi; |
| 139 | struct ufs_super_block_first * usb1; |
| 140 | struct ufs_cg_private_info * ucpi; |
| 141 | struct ufs_cylinder_group * ucg; |
| 142 | unsigned overflow, cgno, bit, end_bit, blkno, i, cylno; |
| 143 | |
| 144 | sb = inode->i_sb; |
| 145 | uspi = UFS_SB(sb)->s_uspi; |
| 146 | usb1 = ubh_get_usb_first(USPI_UBH); |
| 147 | |
| 148 | UFSD(("ENTER, fragment %u, count %u\n", fragment, count)) |
| 149 | |
| 150 | if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) { |
| 151 | ufs_error (sb, "ufs_free_blocks", "internal error, " |
| 152 | "fragment %u, count %u\n", fragment, count); |
| 153 | goto failed; |
| 154 | } |
| 155 | |
| 156 | lock_super(sb); |
| 157 | |
| 158 | do_more: |
| 159 | overflow = 0; |
| 160 | cgno = ufs_dtog (fragment); |
| 161 | bit = ufs_dtogd (fragment); |
| 162 | if (cgno >= uspi->s_ncg) { |
| 163 | ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device"); |
| 164 | goto failed; |
| 165 | } |
| 166 | end_bit = bit + count; |
| 167 | if (end_bit > uspi->s_fpg) { |
| 168 | overflow = bit + count - uspi->s_fpg; |
| 169 | count -= overflow; |
| 170 | end_bit -= overflow; |
| 171 | } |
| 172 | |
| 173 | ucpi = ufs_load_cylinder (sb, cgno); |
| 174 | if (!ucpi) |
| 175 | goto failed; |
| 176 | ucg = ubh_get_ucg (UCPI_UBH); |
| 177 | if (!ufs_cg_chkmagic(sb, ucg)) { |
| 178 | ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno); |
| 179 | goto failed; |
| 180 | } |
| 181 | |
| 182 | for (i = bit; i < end_bit; i += uspi->s_fpb) { |
| 183 | blkno = ufs_fragstoblks(i); |
| 184 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) { |
| 185 | ufs_error(sb, "ufs_free_blocks", "freeing free fragment"); |
| 186 | } |
| 187 | ubh_setblock(UCPI_UBH, ucpi->c_freeoff, blkno); |
| 188 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) |
| 189 | ufs_clusteracct (sb, ucpi, blkno, 1); |
| 190 | DQUOT_FREE_BLOCK(inode, uspi->s_fpb); |
| 191 | |
| 192 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); |
| 193 | fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1); |
| 194 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); |
| 195 | cylno = ufs_cbtocylno(i); |
| 196 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(i)), 1); |
| 197 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); |
| 198 | } |
| 199 | |
| 200 | ubh_mark_buffer_dirty (USPI_UBH); |
| 201 | ubh_mark_buffer_dirty (UCPI_UBH); |
| 202 | if (sb->s_flags & MS_SYNCHRONOUS) { |
Jan Kara | 096125f | 2005-09-06 15:19:15 -0700 | [diff] [blame] | 203 | ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | ubh_wait_on_buffer (UCPI_UBH); |
| 205 | } |
| 206 | |
| 207 | if (overflow) { |
| 208 | fragment += count; |
| 209 | count = overflow; |
| 210 | goto do_more; |
| 211 | } |
| 212 | |
| 213 | sb->s_dirt = 1; |
| 214 | unlock_super (sb); |
| 215 | UFSD(("EXIT\n")) |
| 216 | return; |
| 217 | |
| 218 | failed: |
| 219 | unlock_super (sb); |
| 220 | UFSD(("EXIT (FAILED)\n")) |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | |
| 225 | |
| 226 | #define NULLIFY_FRAGMENTS \ |
| 227 | for (i = oldcount; i < newcount; i++) { \ |
| 228 | bh = sb_getblk(sb, result + i); \ |
| 229 | memset (bh->b_data, 0, sb->s_blocksize); \ |
| 230 | set_buffer_uptodate(bh); \ |
| 231 | mark_buffer_dirty (bh); \ |
| 232 | if (IS_SYNC(inode)) \ |
| 233 | sync_dirty_buffer(bh); \ |
| 234 | brelse (bh); \ |
| 235 | } |
| 236 | |
| 237 | unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment, |
| 238 | unsigned goal, unsigned count, int * err ) |
| 239 | { |
| 240 | struct super_block * sb; |
| 241 | struct ufs_sb_private_info * uspi; |
| 242 | struct ufs_super_block_first * usb1; |
| 243 | struct buffer_head * bh; |
| 244 | unsigned cgno, oldcount, newcount, tmp, request, i, result; |
| 245 | |
| 246 | UFSD(("ENTER, ino %lu, fragment %u, goal %u, count %u\n", inode->i_ino, fragment, goal, count)) |
| 247 | |
| 248 | sb = inode->i_sb; |
| 249 | uspi = UFS_SB(sb)->s_uspi; |
| 250 | usb1 = ubh_get_usb_first(USPI_UBH); |
| 251 | *err = -ENOSPC; |
| 252 | |
| 253 | lock_super (sb); |
| 254 | |
| 255 | tmp = fs32_to_cpu(sb, *p); |
| 256 | if (count + ufs_fragnum(fragment) > uspi->s_fpb) { |
| 257 | ufs_warning (sb, "ufs_new_fragments", "internal warning" |
| 258 | " fragment %u, count %u", fragment, count); |
| 259 | count = uspi->s_fpb - ufs_fragnum(fragment); |
| 260 | } |
| 261 | oldcount = ufs_fragnum (fragment); |
| 262 | newcount = oldcount + count; |
| 263 | |
| 264 | /* |
| 265 | * Somebody else has just allocated our fragments |
| 266 | */ |
| 267 | if (oldcount) { |
| 268 | if (!tmp) { |
| 269 | ufs_error (sb, "ufs_new_fragments", "internal error, " |
| 270 | "fragment %u, tmp %u\n", fragment, tmp); |
| 271 | unlock_super (sb); |
| 272 | return (unsigned)-1; |
| 273 | } |
| 274 | if (fragment < UFS_I(inode)->i_lastfrag) { |
| 275 | UFSD(("EXIT (ALREADY ALLOCATED)\n")) |
| 276 | unlock_super (sb); |
| 277 | return 0; |
| 278 | } |
| 279 | } |
| 280 | else { |
| 281 | if (tmp) { |
| 282 | UFSD(("EXIT (ALREADY ALLOCATED)\n")) |
| 283 | unlock_super(sb); |
| 284 | return 0; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * There is not enough space for user on the device |
| 290 | */ |
| 291 | if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(usb1, UFS_MINFREE) <= 0) { |
| 292 | unlock_super (sb); |
| 293 | UFSD(("EXIT (FAILED)\n")) |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | if (goal >= uspi->s_size) |
| 298 | goal = 0; |
| 299 | if (goal == 0) |
| 300 | cgno = ufs_inotocg (inode->i_ino); |
| 301 | else |
| 302 | cgno = ufs_dtog (goal); |
| 303 | |
| 304 | /* |
| 305 | * allocate new fragment |
| 306 | */ |
| 307 | if (oldcount == 0) { |
| 308 | result = ufs_alloc_fragments (inode, cgno, goal, count, err); |
| 309 | if (result) { |
| 310 | *p = cpu_to_fs32(sb, result); |
| 311 | *err = 0; |
| 312 | inode->i_blocks += count << uspi->s_nspfshift; |
| 313 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); |
| 314 | NULLIFY_FRAGMENTS |
| 315 | } |
| 316 | unlock_super(sb); |
| 317 | UFSD(("EXIT, result %u\n", result)) |
| 318 | return result; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * resize block |
| 323 | */ |
| 324 | result = ufs_add_fragments (inode, tmp, oldcount, newcount, err); |
| 325 | if (result) { |
| 326 | *err = 0; |
| 327 | inode->i_blocks += count << uspi->s_nspfshift; |
| 328 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); |
| 329 | NULLIFY_FRAGMENTS |
| 330 | unlock_super(sb); |
| 331 | UFSD(("EXIT, result %u\n", result)) |
| 332 | return result; |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * allocate new block and move data |
| 337 | */ |
| 338 | switch (fs32_to_cpu(sb, usb1->fs_optim)) { |
| 339 | case UFS_OPTSPACE: |
| 340 | request = newcount; |
| 341 | if (uspi->s_minfree < 5 || fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) |
| 342 | > uspi->s_dsize * uspi->s_minfree / (2 * 100) ) |
| 343 | break; |
| 344 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); |
| 345 | break; |
| 346 | default: |
| 347 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); |
| 348 | |
| 349 | case UFS_OPTTIME: |
| 350 | request = uspi->s_fpb; |
| 351 | if (fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) < uspi->s_dsize * |
| 352 | (uspi->s_minfree - 2) / 100) |
| 353 | break; |
| 354 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); |
| 355 | break; |
| 356 | } |
| 357 | result = ufs_alloc_fragments (inode, cgno, goal, request, err); |
| 358 | if (result) { |
| 359 | for (i = 0; i < oldcount; i++) { |
| 360 | bh = sb_bread(sb, tmp + i); |
| 361 | if(bh) |
| 362 | { |
| 363 | clear_buffer_dirty(bh); |
| 364 | bh->b_blocknr = result + i; |
| 365 | mark_buffer_dirty (bh); |
| 366 | if (IS_SYNC(inode)) |
| 367 | sync_dirty_buffer(bh); |
| 368 | brelse (bh); |
| 369 | } |
| 370 | else |
| 371 | { |
| 372 | printk(KERN_ERR "ufs_new_fragments: bread fail\n"); |
| 373 | unlock_super(sb); |
| 374 | return 0; |
| 375 | } |
| 376 | } |
| 377 | *p = cpu_to_fs32(sb, result); |
| 378 | *err = 0; |
| 379 | inode->i_blocks += count << uspi->s_nspfshift; |
| 380 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); |
| 381 | NULLIFY_FRAGMENTS |
| 382 | unlock_super(sb); |
| 383 | if (newcount < request) |
| 384 | ufs_free_fragments (inode, result + newcount, request - newcount); |
| 385 | ufs_free_fragments (inode, tmp, oldcount); |
| 386 | UFSD(("EXIT, result %u\n", result)) |
| 387 | return result; |
| 388 | } |
| 389 | |
| 390 | unlock_super(sb); |
| 391 | UFSD(("EXIT (FAILED)\n")) |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static unsigned |
| 396 | ufs_add_fragments (struct inode * inode, unsigned fragment, |
| 397 | unsigned oldcount, unsigned newcount, int * err) |
| 398 | { |
| 399 | struct super_block * sb; |
| 400 | struct ufs_sb_private_info * uspi; |
| 401 | struct ufs_super_block_first * usb1; |
| 402 | struct ufs_cg_private_info * ucpi; |
| 403 | struct ufs_cylinder_group * ucg; |
| 404 | unsigned cgno, fragno, fragoff, count, fragsize, i; |
| 405 | |
| 406 | UFSD(("ENTER, fragment %u, oldcount %u, newcount %u\n", fragment, oldcount, newcount)) |
| 407 | |
| 408 | sb = inode->i_sb; |
| 409 | uspi = UFS_SB(sb)->s_uspi; |
| 410 | usb1 = ubh_get_usb_first (USPI_UBH); |
| 411 | count = newcount - oldcount; |
| 412 | |
| 413 | cgno = ufs_dtog(fragment); |
| 414 | if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count) |
| 415 | return 0; |
| 416 | if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb) |
| 417 | return 0; |
| 418 | ucpi = ufs_load_cylinder (sb, cgno); |
| 419 | if (!ucpi) |
| 420 | return 0; |
| 421 | ucg = ubh_get_ucg (UCPI_UBH); |
| 422 | if (!ufs_cg_chkmagic(sb, ucg)) { |
| 423 | ufs_panic (sb, "ufs_add_fragments", |
| 424 | "internal error, bad magic number on cg %u", cgno); |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | fragno = ufs_dtogd (fragment); |
| 429 | fragoff = ufs_fragnum (fragno); |
| 430 | for (i = oldcount; i < newcount; i++) |
| 431 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i)) |
| 432 | return 0; |
| 433 | /* |
| 434 | * Block can be extended |
| 435 | */ |
| 436 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); |
| 437 | for (i = newcount; i < (uspi->s_fpb - fragoff); i++) |
| 438 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i)) |
| 439 | break; |
| 440 | fragsize = i - oldcount; |
| 441 | if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize])) |
| 442 | ufs_panic (sb, "ufs_add_fragments", |
| 443 | "internal error or corrupted bitmap on cg %u", cgno); |
| 444 | fs32_sub(sb, &ucg->cg_frsum[fragsize], 1); |
| 445 | if (fragsize != count) |
| 446 | fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1); |
| 447 | for (i = oldcount; i < newcount; i++) |
| 448 | ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, fragno + i); |
| 449 | if(DQUOT_ALLOC_BLOCK(inode, count)) { |
| 450 | *err = -EDQUOT; |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); |
| 455 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); |
| 456 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count); |
| 457 | |
| 458 | ubh_mark_buffer_dirty (USPI_UBH); |
| 459 | ubh_mark_buffer_dirty (UCPI_UBH); |
| 460 | if (sb->s_flags & MS_SYNCHRONOUS) { |
Jan Kara | 096125f | 2005-09-06 15:19:15 -0700 | [diff] [blame] | 461 | ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | ubh_wait_on_buffer (UCPI_UBH); |
| 463 | } |
| 464 | sb->s_dirt = 1; |
| 465 | |
| 466 | UFSD(("EXIT, fragment %u\n", fragment)) |
| 467 | |
| 468 | return fragment; |
| 469 | } |
| 470 | |
| 471 | #define UFS_TEST_FREE_SPACE_CG \ |
| 472 | ucg = (struct ufs_cylinder_group *) UFS_SB(sb)->s_ucg[cgno]->b_data; \ |
| 473 | if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree)) \ |
| 474 | goto cg_found; \ |
| 475 | for (k = count; k < uspi->s_fpb; k++) \ |
| 476 | if (fs32_to_cpu(sb, ucg->cg_frsum[k])) \ |
| 477 | goto cg_found; |
| 478 | |
| 479 | static unsigned ufs_alloc_fragments (struct inode * inode, unsigned cgno, |
| 480 | unsigned goal, unsigned count, int * err) |
| 481 | { |
| 482 | struct super_block * sb; |
| 483 | struct ufs_sb_private_info * uspi; |
| 484 | struct ufs_super_block_first * usb1; |
| 485 | struct ufs_cg_private_info * ucpi; |
| 486 | struct ufs_cylinder_group * ucg; |
| 487 | unsigned oldcg, i, j, k, result, allocsize; |
| 488 | |
| 489 | UFSD(("ENTER, ino %lu, cgno %u, goal %u, count %u\n", inode->i_ino, cgno, goal, count)) |
| 490 | |
| 491 | sb = inode->i_sb; |
| 492 | uspi = UFS_SB(sb)->s_uspi; |
| 493 | usb1 = ubh_get_usb_first(USPI_UBH); |
| 494 | oldcg = cgno; |
| 495 | |
| 496 | /* |
| 497 | * 1. searching on preferred cylinder group |
| 498 | */ |
| 499 | UFS_TEST_FREE_SPACE_CG |
| 500 | |
| 501 | /* |
| 502 | * 2. quadratic rehash |
| 503 | */ |
| 504 | for (j = 1; j < uspi->s_ncg; j *= 2) { |
| 505 | cgno += j; |
| 506 | if (cgno >= uspi->s_ncg) |
| 507 | cgno -= uspi->s_ncg; |
| 508 | UFS_TEST_FREE_SPACE_CG |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * 3. brute force search |
| 513 | * We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step ) |
| 514 | */ |
| 515 | cgno = (oldcg + 1) % uspi->s_ncg; |
| 516 | for (j = 2; j < uspi->s_ncg; j++) { |
| 517 | cgno++; |
| 518 | if (cgno >= uspi->s_ncg) |
| 519 | cgno = 0; |
| 520 | UFS_TEST_FREE_SPACE_CG |
| 521 | } |
| 522 | |
| 523 | UFSD(("EXIT (FAILED)\n")) |
| 524 | return 0; |
| 525 | |
| 526 | cg_found: |
| 527 | ucpi = ufs_load_cylinder (sb, cgno); |
| 528 | if (!ucpi) |
| 529 | return 0; |
| 530 | ucg = ubh_get_ucg (UCPI_UBH); |
| 531 | if (!ufs_cg_chkmagic(sb, ucg)) |
| 532 | ufs_panic (sb, "ufs_alloc_fragments", |
| 533 | "internal error, bad magic number on cg %u", cgno); |
| 534 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); |
| 535 | |
| 536 | if (count == uspi->s_fpb) { |
| 537 | result = ufs_alloccg_block (inode, ucpi, goal, err); |
| 538 | if (result == (unsigned)-1) |
| 539 | return 0; |
| 540 | goto succed; |
| 541 | } |
| 542 | |
| 543 | for (allocsize = count; allocsize < uspi->s_fpb; allocsize++) |
| 544 | if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0) |
| 545 | break; |
| 546 | |
| 547 | if (allocsize == uspi->s_fpb) { |
| 548 | result = ufs_alloccg_block (inode, ucpi, goal, err); |
| 549 | if (result == (unsigned)-1) |
| 550 | return 0; |
| 551 | goal = ufs_dtogd (result); |
| 552 | for (i = count; i < uspi->s_fpb; i++) |
| 553 | ubh_setbit (UCPI_UBH, ucpi->c_freeoff, goal + i); |
| 554 | i = uspi->s_fpb - count; |
| 555 | DQUOT_FREE_BLOCK(inode, i); |
| 556 | |
| 557 | fs32_add(sb, &ucg->cg_cs.cs_nffree, i); |
| 558 | fs32_add(sb, &usb1->fs_cstotal.cs_nffree, i); |
| 559 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i); |
| 560 | fs32_add(sb, &ucg->cg_frsum[i], 1); |
| 561 | goto succed; |
| 562 | } |
| 563 | |
| 564 | result = ufs_bitmap_search (sb, ucpi, goal, allocsize); |
| 565 | if (result == (unsigned)-1) |
| 566 | return 0; |
| 567 | if(DQUOT_ALLOC_BLOCK(inode, count)) { |
| 568 | *err = -EDQUOT; |
| 569 | return 0; |
| 570 | } |
| 571 | for (i = 0; i < count; i++) |
| 572 | ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, result + i); |
| 573 | |
| 574 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); |
| 575 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count); |
| 576 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); |
| 577 | fs32_sub(sb, &ucg->cg_frsum[allocsize], 1); |
| 578 | |
| 579 | if (count != allocsize) |
| 580 | fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1); |
| 581 | |
| 582 | succed: |
| 583 | ubh_mark_buffer_dirty (USPI_UBH); |
| 584 | ubh_mark_buffer_dirty (UCPI_UBH); |
| 585 | if (sb->s_flags & MS_SYNCHRONOUS) { |
Jan Kara | 096125f | 2005-09-06 15:19:15 -0700 | [diff] [blame] | 586 | ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | ubh_wait_on_buffer (UCPI_UBH); |
| 588 | } |
| 589 | sb->s_dirt = 1; |
| 590 | |
| 591 | result += cgno * uspi->s_fpg; |
| 592 | UFSD(("EXIT3, result %u\n", result)) |
| 593 | return result; |
| 594 | } |
| 595 | |
| 596 | static unsigned ufs_alloccg_block (struct inode * inode, |
| 597 | struct ufs_cg_private_info * ucpi, unsigned goal, int * err) |
| 598 | { |
| 599 | struct super_block * sb; |
| 600 | struct ufs_sb_private_info * uspi; |
| 601 | struct ufs_super_block_first * usb1; |
| 602 | struct ufs_cylinder_group * ucg; |
| 603 | unsigned result, cylno, blkno; |
| 604 | |
| 605 | UFSD(("ENTER, goal %u\n", goal)) |
| 606 | |
| 607 | sb = inode->i_sb; |
| 608 | uspi = UFS_SB(sb)->s_uspi; |
| 609 | usb1 = ubh_get_usb_first(USPI_UBH); |
| 610 | ucg = ubh_get_ucg(UCPI_UBH); |
| 611 | |
| 612 | if (goal == 0) { |
| 613 | goal = ucpi->c_rotor; |
| 614 | goto norot; |
| 615 | } |
| 616 | goal = ufs_blknum (goal); |
| 617 | goal = ufs_dtogd (goal); |
| 618 | |
| 619 | /* |
| 620 | * If the requested block is available, use it. |
| 621 | */ |
| 622 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, ufs_fragstoblks(goal))) { |
| 623 | result = goal; |
| 624 | goto gotit; |
| 625 | } |
| 626 | |
| 627 | norot: |
| 628 | result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb); |
| 629 | if (result == (unsigned)-1) |
| 630 | return (unsigned)-1; |
| 631 | ucpi->c_rotor = result; |
| 632 | gotit: |
| 633 | blkno = ufs_fragstoblks(result); |
| 634 | ubh_clrblock (UCPI_UBH, ucpi->c_freeoff, blkno); |
| 635 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) |
| 636 | ufs_clusteracct (sb, ucpi, blkno, -1); |
| 637 | if(DQUOT_ALLOC_BLOCK(inode, uspi->s_fpb)) { |
| 638 | *err = -EDQUOT; |
| 639 | return (unsigned)-1; |
| 640 | } |
| 641 | |
| 642 | fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1); |
| 643 | fs32_sub(sb, &usb1->fs_cstotal.cs_nbfree, 1); |
| 644 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1); |
| 645 | cylno = ufs_cbtocylno(result); |
| 646 | fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(result)), 1); |
| 647 | fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1); |
| 648 | |
| 649 | UFSD(("EXIT, result %u\n", result)) |
| 650 | |
| 651 | return result; |
| 652 | } |
| 653 | |
| 654 | static unsigned ufs_bitmap_search (struct super_block * sb, |
| 655 | struct ufs_cg_private_info * ucpi, unsigned goal, unsigned count) |
| 656 | { |
| 657 | struct ufs_sb_private_info * uspi; |
| 658 | struct ufs_super_block_first * usb1; |
| 659 | struct ufs_cylinder_group * ucg; |
| 660 | unsigned start, length, location, result; |
| 661 | unsigned possition, fragsize, blockmap, mask; |
| 662 | |
| 663 | UFSD(("ENTER, cg %u, goal %u, count %u\n", ucpi->c_cgx, goal, count)) |
| 664 | |
| 665 | uspi = UFS_SB(sb)->s_uspi; |
| 666 | usb1 = ubh_get_usb_first (USPI_UBH); |
| 667 | ucg = ubh_get_ucg(UCPI_UBH); |
| 668 | |
| 669 | if (goal) |
| 670 | start = ufs_dtogd(goal) >> 3; |
| 671 | else |
| 672 | start = ucpi->c_frotor >> 3; |
| 673 | |
| 674 | length = ((uspi->s_fpg + 7) >> 3) - start; |
| 675 | location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff + start, length, |
| 676 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, |
| 677 | 1 << (count - 1 + (uspi->s_fpb & 7))); |
| 678 | if (location == 0) { |
| 679 | length = start + 1; |
| 680 | location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff, length, |
| 681 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, |
| 682 | 1 << (count - 1 + (uspi->s_fpb & 7))); |
| 683 | if (location == 0) { |
| 684 | ufs_error (sb, "ufs_bitmap_search", |
| 685 | "bitmap corrupted on cg %u, start %u, length %u, count %u, freeoff %u\n", |
| 686 | ucpi->c_cgx, start, length, count, ucpi->c_freeoff); |
| 687 | return (unsigned)-1; |
| 688 | } |
| 689 | start = 0; |
| 690 | } |
| 691 | result = (start + length - location) << 3; |
| 692 | ucpi->c_frotor = result; |
| 693 | |
| 694 | /* |
| 695 | * found the byte in the map |
| 696 | */ |
| 697 | blockmap = ubh_blkmap(UCPI_UBH, ucpi->c_freeoff, result); |
| 698 | fragsize = 0; |
| 699 | for (possition = 0, mask = 1; possition < 8; possition++, mask <<= 1) { |
| 700 | if (blockmap & mask) { |
| 701 | if (!(possition & uspi->s_fpbmask)) |
| 702 | fragsize = 1; |
| 703 | else |
| 704 | fragsize++; |
| 705 | } |
| 706 | else { |
| 707 | if (fragsize == count) { |
| 708 | result += possition - count; |
| 709 | UFSD(("EXIT, result %u\n", result)) |
| 710 | return result; |
| 711 | } |
| 712 | fragsize = 0; |
| 713 | } |
| 714 | } |
| 715 | if (fragsize == count) { |
| 716 | result += possition - count; |
| 717 | UFSD(("EXIT, result %u\n", result)) |
| 718 | return result; |
| 719 | } |
| 720 | ufs_error (sb, "ufs_bitmap_search", "block not in map on cg %u\n", ucpi->c_cgx); |
| 721 | UFSD(("EXIT (FAILED)\n")) |
| 722 | return (unsigned)-1; |
| 723 | } |
| 724 | |
| 725 | static void ufs_clusteracct(struct super_block * sb, |
| 726 | struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt) |
| 727 | { |
| 728 | struct ufs_sb_private_info * uspi; |
| 729 | int i, start, end, forw, back; |
| 730 | |
| 731 | uspi = UFS_SB(sb)->s_uspi; |
| 732 | if (uspi->s_contigsumsize <= 0) |
| 733 | return; |
| 734 | |
| 735 | if (cnt > 0) |
| 736 | ubh_setbit(UCPI_UBH, ucpi->c_clusteroff, blkno); |
| 737 | else |
| 738 | ubh_clrbit(UCPI_UBH, ucpi->c_clusteroff, blkno); |
| 739 | |
| 740 | /* |
| 741 | * Find the size of the cluster going forward. |
| 742 | */ |
| 743 | start = blkno + 1; |
| 744 | end = start + uspi->s_contigsumsize; |
| 745 | if ( end >= ucpi->c_nclusterblks) |
| 746 | end = ucpi->c_nclusterblks; |
| 747 | i = ubh_find_next_zero_bit (UCPI_UBH, ucpi->c_clusteroff, end, start); |
| 748 | if (i > end) |
| 749 | i = end; |
| 750 | forw = i - start; |
| 751 | |
| 752 | /* |
| 753 | * Find the size of the cluster going backward. |
| 754 | */ |
| 755 | start = blkno - 1; |
| 756 | end = start - uspi->s_contigsumsize; |
| 757 | if (end < 0 ) |
| 758 | end = -1; |
| 759 | i = ubh_find_last_zero_bit (UCPI_UBH, ucpi->c_clusteroff, start, end); |
| 760 | if ( i < end) |
| 761 | i = end; |
| 762 | back = start - i; |
| 763 | |
| 764 | /* |
| 765 | * Account for old cluster and the possibly new forward and |
| 766 | * back clusters. |
| 767 | */ |
| 768 | i = back + forw + 1; |
| 769 | if (i > uspi->s_contigsumsize) |
| 770 | i = uspi->s_contigsumsize; |
| 771 | fs32_add(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (i << 2)), cnt); |
| 772 | if (back > 0) |
| 773 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (back << 2)), cnt); |
| 774 | if (forw > 0) |
| 775 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (forw << 2)), cnt); |
| 776 | } |
| 777 | |
| 778 | |
| 779 | static unsigned char ufs_fragtable_8fpb[] = { |
| 780 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, |
| 781 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, |
| 782 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 783 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, |
| 784 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 785 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, |
| 786 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, |
| 787 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40, |
| 788 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 789 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, |
| 790 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 791 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, |
| 792 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, |
| 793 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12, |
| 794 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C, |
| 795 | 0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, |
| 796 | }; |
| 797 | |
| 798 | static unsigned char ufs_fragtable_other[] = { |
| 799 | 0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A, |
| 800 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 801 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 802 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, |
| 803 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 804 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 805 | 0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE, |
| 806 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, |
| 807 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 808 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 809 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, |
| 810 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, |
| 811 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, |
| 812 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, |
| 813 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, |
| 814 | 0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A, |
| 815 | }; |