| 1 | /* $NetBSD: ffs_balloc.c,v 1.62 2016/09/25 11:45:39 jdolecek Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2002 Networks Associates Technology, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This software was developed for the FreeBSD Project by Marshall |
| 8 | * Kirk McKusick and Network Associates Laboratories, the Security |
| 9 | * Research Division of Network Associates, Inc. under DARPA/SPAWAR |
| 10 | * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS |
| 11 | * research program |
| 12 | * |
| 13 | * Copyright (c) 1982, 1986, 1989, 1993 |
| 14 | * The Regents of the University of California. All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * 3. Neither the name of the University nor the names of its contributors |
| 25 | * may be used to endorse or promote products derived from this software |
| 26 | * without specific prior written permission. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 38 | * SUCH DAMAGE. |
| 39 | * |
| 40 | * @(#)ffs_balloc.c 8.8 (Berkeley) 6/16/95 |
| 41 | */ |
| 42 | |
| 43 | #include <sys/cdefs.h> |
| 44 | __KERNEL_RCSID(0, "$NetBSD: ffs_balloc.c,v 1.62 2016/09/25 11:45:39 jdolecek Exp $" ); |
| 45 | |
| 46 | #if defined(_KERNEL_OPT) |
| 47 | #include "opt_quota.h" |
| 48 | #endif |
| 49 | |
| 50 | #include <sys/param.h> |
| 51 | #include <sys/systm.h> |
| 52 | #include <sys/buf.h> |
| 53 | #include <sys/file.h> |
| 54 | #include <sys/mount.h> |
| 55 | #include <sys/vnode.h> |
| 56 | #include <sys/kauth.h> |
| 57 | #include <sys/fstrans.h> |
| 58 | |
| 59 | #include <ufs/ufs/quota.h> |
| 60 | #include <ufs/ufs/ufsmount.h> |
| 61 | #include <ufs/ufs/inode.h> |
| 62 | #include <ufs/ufs/ufs_extern.h> |
| 63 | #include <ufs/ufs/ufs_bswap.h> |
| 64 | |
| 65 | #include <ufs/ffs/fs.h> |
| 66 | #include <ufs/ffs/ffs_extern.h> |
| 67 | |
| 68 | #include <uvm/uvm.h> |
| 69 | |
| 70 | static int ffs_balloc_ufs1(struct vnode *, off_t, int, kauth_cred_t, int, |
| 71 | struct buf **); |
| 72 | static int ffs_balloc_ufs2(struct vnode *, off_t, int, kauth_cred_t, int, |
| 73 | struct buf **); |
| 74 | |
| 75 | /* |
| 76 | * Balloc defines the structure of file system storage |
| 77 | * by allocating the physical blocks on a device given |
| 78 | * the inode and the logical block number in a file. |
| 79 | */ |
| 80 | |
| 81 | int |
| 82 | ffs_balloc(struct vnode *vp, off_t off, int size, kauth_cred_t cred, int flags, |
| 83 | struct buf **bpp) |
| 84 | { |
| 85 | int error; |
| 86 | |
| 87 | if (VTOI(vp)->i_fs->fs_magic == FS_UFS2_MAGIC) |
| 88 | error = ffs_balloc_ufs2(vp, off, size, cred, flags, bpp); |
| 89 | else |
| 90 | error = ffs_balloc_ufs1(vp, off, size, cred, flags, bpp); |
| 91 | |
| 92 | if (error == 0 && bpp != NULL && (error = fscow_run(*bpp, false)) != 0) |
| 93 | brelse(*bpp, 0); |
| 94 | |
| 95 | return error; |
| 96 | } |
| 97 | |
| 98 | static int |
| 99 | ffs_balloc_ufs1(struct vnode *vp, off_t off, int size, kauth_cred_t cred, |
| 100 | int flags, struct buf **bpp) |
| 101 | { |
| 102 | daddr_t lbn, lastlbn; |
| 103 | struct buf *bp, *nbp; |
| 104 | struct inode *ip = VTOI(vp); |
| 105 | struct fs *fs = ip->i_fs; |
| 106 | struct ufsmount *ump = ip->i_ump; |
| 107 | struct indir indirs[UFS_NIADDR + 2]; |
| 108 | daddr_t newb, pref, nb; |
| 109 | int32_t *bap; /* XXX ondisk32 */ |
| 110 | int deallocated, osize, nsize, num, i, error; |
| 111 | int32_t *blkp, *allocblk, allociblk[UFS_NIADDR + 1]; |
| 112 | int32_t *allocib; |
| 113 | int unwindidx = -1; |
| 114 | const int needswap = UFS_FSNEEDSWAP(fs); |
| 115 | UVMHIST_FUNC("ffs_balloc" ); UVMHIST_CALLED(ubchist); |
| 116 | |
| 117 | lbn = ffs_lblkno(fs, off); |
| 118 | size = ffs_blkoff(fs, off) + size; |
| 119 | if (size > fs->fs_bsize) |
| 120 | panic("ffs_balloc: blk too big" ); |
| 121 | if (bpp != NULL) { |
| 122 | *bpp = NULL; |
| 123 | } |
| 124 | UVMHIST_LOG(ubchist, "vp %p lbn 0x%x size 0x%x" , vp, lbn, size,0); |
| 125 | |
| 126 | if (lbn < 0) |
| 127 | return (EFBIG); |
| 128 | |
| 129 | /* |
| 130 | * If the next write will extend the file into a new block, |
| 131 | * and the file is currently composed of a fragment |
| 132 | * this fragment has to be extended to be a full block. |
| 133 | */ |
| 134 | |
| 135 | lastlbn = ffs_lblkno(fs, ip->i_size); |
| 136 | if (lastlbn < UFS_NDADDR && lastlbn < lbn) { |
| 137 | nb = lastlbn; |
| 138 | osize = ffs_blksize(fs, ip, nb); |
| 139 | if (osize < fs->fs_bsize && osize > 0) { |
| 140 | mutex_enter(&ump->um_lock); |
| 141 | error = ffs_realloccg(ip, nb, |
| 142 | ffs_blkpref_ufs1(ip, lastlbn, nb, flags, |
| 143 | &ip->i_ffs1_db[0]), |
| 144 | osize, (int)fs->fs_bsize, cred, bpp, &newb); |
| 145 | if (error) |
| 146 | return (error); |
| 147 | ip->i_size = ffs_lblktosize(fs, nb + 1); |
| 148 | ip->i_ffs1_size = ip->i_size; |
| 149 | uvm_vnp_setsize(vp, ip->i_ffs1_size); |
| 150 | ip->i_ffs1_db[nb] = ufs_rw32((u_int32_t)newb, needswap); |
| 151 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 152 | if (bpp && *bpp) { |
| 153 | if (flags & B_SYNC) |
| 154 | bwrite(*bpp); |
| 155 | else |
| 156 | bawrite(*bpp); |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * The first UFS_NDADDR blocks are direct blocks |
| 163 | */ |
| 164 | |
| 165 | if (lbn < UFS_NDADDR) { |
| 166 | nb = ufs_rw32(ip->i_ffs1_db[lbn], needswap); |
| 167 | if (nb != 0 && ip->i_size >= ffs_lblktosize(fs, lbn + 1)) { |
| 168 | |
| 169 | /* |
| 170 | * The block is an already-allocated direct block |
| 171 | * and the file already extends past this block, |
| 172 | * thus this must be a whole block. |
| 173 | * Just read the block (if requested). |
| 174 | */ |
| 175 | |
| 176 | if (bpp != NULL) { |
| 177 | error = bread(vp, lbn, fs->fs_bsize, |
| 178 | B_MODIFY, bpp); |
| 179 | if (error) { |
| 180 | return (error); |
| 181 | } |
| 182 | } |
| 183 | return (0); |
| 184 | } |
| 185 | if (nb != 0) { |
| 186 | |
| 187 | /* |
| 188 | * Consider need to reallocate a fragment. |
| 189 | */ |
| 190 | |
| 191 | osize = ffs_fragroundup(fs, ffs_blkoff(fs, ip->i_size)); |
| 192 | nsize = ffs_fragroundup(fs, size); |
| 193 | if (nsize <= osize) { |
| 194 | |
| 195 | /* |
| 196 | * The existing block is already |
| 197 | * at least as big as we want. |
| 198 | * Just read the block (if requested). |
| 199 | */ |
| 200 | |
| 201 | if (bpp != NULL) { |
| 202 | error = bread(vp, lbn, osize, |
| 203 | B_MODIFY, bpp); |
| 204 | if (error) { |
| 205 | return (error); |
| 206 | } |
| 207 | } |
| 208 | return 0; |
| 209 | } else { |
| 210 | |
| 211 | /* |
| 212 | * The existing block is smaller than we want, |
| 213 | * grow it. |
| 214 | */ |
| 215 | mutex_enter(&ump->um_lock); |
| 216 | error = ffs_realloccg(ip, lbn, |
| 217 | ffs_blkpref_ufs1(ip, lbn, (int)lbn, flags, |
| 218 | &ip->i_ffs1_db[0]), |
| 219 | osize, nsize, cred, bpp, &newb); |
| 220 | if (error) |
| 221 | return (error); |
| 222 | } |
| 223 | } else { |
| 224 | |
| 225 | /* |
| 226 | * the block was not previously allocated, |
| 227 | * allocate a new block or fragment. |
| 228 | */ |
| 229 | |
| 230 | if (ip->i_size < ffs_lblktosize(fs, lbn + 1)) |
| 231 | nsize = ffs_fragroundup(fs, size); |
| 232 | else |
| 233 | nsize = fs->fs_bsize; |
| 234 | mutex_enter(&ump->um_lock); |
| 235 | error = ffs_alloc(ip, lbn, |
| 236 | ffs_blkpref_ufs1(ip, lbn, (int)lbn, flags, |
| 237 | &ip->i_ffs1_db[0]), |
| 238 | nsize, flags, cred, &newb); |
| 239 | if (error) |
| 240 | return (error); |
| 241 | if (bpp != NULL) { |
| 242 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, newb), |
| 243 | nsize, (flags & B_CLRBUF) != 0, bpp); |
| 244 | if (error) |
| 245 | return error; |
| 246 | } |
| 247 | } |
| 248 | ip->i_ffs1_db[lbn] = ufs_rw32((u_int32_t)newb, needswap); |
| 249 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 250 | return (0); |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Determine the number of levels of indirection. |
| 255 | */ |
| 256 | |
| 257 | pref = 0; |
| 258 | if ((error = ufs_getlbns(vp, lbn, indirs, &num)) != 0) |
| 259 | return (error); |
| 260 | |
| 261 | /* |
| 262 | * Fetch the first indirect block allocating if necessary. |
| 263 | */ |
| 264 | |
| 265 | --num; |
| 266 | nb = ufs_rw32(ip->i_ffs1_ib[indirs[0].in_off], needswap); |
| 267 | allocib = NULL; |
| 268 | allocblk = allociblk; |
| 269 | if (nb == 0) { |
| 270 | mutex_enter(&ump->um_lock); |
| 271 | pref = ffs_blkpref_ufs1(ip, lbn, 0, flags | B_METAONLY, NULL); |
| 272 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, |
| 273 | flags | B_METAONLY, cred, &newb); |
| 274 | if (error) |
| 275 | goto fail; |
| 276 | nb = newb; |
| 277 | *allocblk++ = nb; |
| 278 | error = ffs_getblk(vp, indirs[1].in_lbn, FFS_FSBTODB(fs, nb), |
| 279 | fs->fs_bsize, true, &bp); |
| 280 | if (error) |
| 281 | goto fail; |
| 282 | /* |
| 283 | * Write synchronously so that indirect blocks |
| 284 | * never point at garbage. |
| 285 | */ |
| 286 | if ((error = bwrite(bp)) != 0) |
| 287 | goto fail; |
| 288 | unwindidx = 0; |
| 289 | allocib = &ip->i_ffs1_ib[indirs[0].in_off]; |
| 290 | *allocib = ufs_rw32(nb, needswap); |
| 291 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Fetch through the indirect blocks, allocating as necessary. |
| 296 | */ |
| 297 | |
| 298 | for (i = 1;;) { |
| 299 | error = bread(vp, |
| 300 | indirs[i].in_lbn, (int)fs->fs_bsize, 0, &bp); |
| 301 | if (error) { |
| 302 | goto fail; |
| 303 | } |
| 304 | bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ |
| 305 | nb = ufs_rw32(bap[indirs[i].in_off], needswap); |
| 306 | if (i == num) |
| 307 | break; |
| 308 | i++; |
| 309 | if (nb != 0) { |
| 310 | brelse(bp, 0); |
| 311 | continue; |
| 312 | } |
| 313 | if (fscow_run(bp, true) != 0) { |
| 314 | brelse(bp, 0); |
| 315 | goto fail; |
| 316 | } |
| 317 | mutex_enter(&ump->um_lock); |
| 318 | /* Try to keep snapshot indirect blocks contiguous. */ |
| 319 | if (i == num && (ip->i_flags & SF_SNAPSHOT) != 0) |
| 320 | pref = ffs_blkpref_ufs1(ip, lbn, indirs[i-1].in_off, |
| 321 | flags | B_METAONLY, &bap[0]); |
| 322 | if (pref == 0) |
| 323 | pref = ffs_blkpref_ufs1(ip, lbn, 0, flags | B_METAONLY, |
| 324 | NULL); |
| 325 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, |
| 326 | flags | B_METAONLY, cred, &newb); |
| 327 | if (error) { |
| 328 | brelse(bp, 0); |
| 329 | goto fail; |
| 330 | } |
| 331 | nb = newb; |
| 332 | *allocblk++ = nb; |
| 333 | error = ffs_getblk(vp, indirs[i].in_lbn, FFS_FSBTODB(fs, nb), |
| 334 | fs->fs_bsize, true, &nbp); |
| 335 | if (error) { |
| 336 | brelse(bp, 0); |
| 337 | goto fail; |
| 338 | } |
| 339 | /* |
| 340 | * Write synchronously so that indirect blocks |
| 341 | * never point at garbage. |
| 342 | */ |
| 343 | if ((error = bwrite(nbp)) != 0) { |
| 344 | brelse(bp, 0); |
| 345 | goto fail; |
| 346 | } |
| 347 | if (unwindidx < 0) |
| 348 | unwindidx = i - 1; |
| 349 | bap[indirs[i - 1].in_off] = ufs_rw32(nb, needswap); |
| 350 | |
| 351 | /* |
| 352 | * If required, write synchronously, otherwise use |
| 353 | * delayed write. |
| 354 | */ |
| 355 | |
| 356 | if (flags & B_SYNC) { |
| 357 | bwrite(bp); |
| 358 | } else { |
| 359 | bdwrite(bp); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | if (flags & B_METAONLY) { |
| 364 | KASSERT(bpp != NULL); |
| 365 | *bpp = bp; |
| 366 | return (0); |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Get the data block, allocating if necessary. |
| 371 | */ |
| 372 | |
| 373 | if (nb == 0) { |
| 374 | if (fscow_run(bp, true) != 0) { |
| 375 | brelse(bp, 0); |
| 376 | goto fail; |
| 377 | } |
| 378 | mutex_enter(&ump->um_lock); |
| 379 | pref = ffs_blkpref_ufs1(ip, lbn, indirs[num].in_off, flags, |
| 380 | &bap[0]); |
| 381 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, flags, cred, |
| 382 | &newb); |
| 383 | if (error) { |
| 384 | brelse(bp, 0); |
| 385 | goto fail; |
| 386 | } |
| 387 | nb = newb; |
| 388 | *allocblk++ = nb; |
| 389 | if (bpp != NULL) { |
| 390 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, nb), |
| 391 | fs->fs_bsize, (flags & B_CLRBUF) != 0, bpp); |
| 392 | if (error) { |
| 393 | brelse(bp, 0); |
| 394 | goto fail; |
| 395 | } |
| 396 | } |
| 397 | bap[indirs[num].in_off] = ufs_rw32(nb, needswap); |
| 398 | if (allocib == NULL && unwindidx < 0) { |
| 399 | unwindidx = i - 1; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * If required, write synchronously, otherwise use |
| 404 | * delayed write. |
| 405 | */ |
| 406 | |
| 407 | if (flags & B_SYNC) { |
| 408 | bwrite(bp); |
| 409 | } else { |
| 410 | bdwrite(bp); |
| 411 | } |
| 412 | return (0); |
| 413 | } |
| 414 | brelse(bp, 0); |
| 415 | if (bpp != NULL) { |
| 416 | if (flags & B_CLRBUF) { |
| 417 | error = bread(vp, lbn, (int)fs->fs_bsize, |
| 418 | B_MODIFY, &nbp); |
| 419 | if (error) { |
| 420 | goto fail; |
| 421 | } |
| 422 | } else { |
| 423 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, nb), |
| 424 | fs->fs_bsize, true, &nbp); |
| 425 | if (error) |
| 426 | goto fail; |
| 427 | } |
| 428 | *bpp = nbp; |
| 429 | } |
| 430 | return (0); |
| 431 | |
| 432 | fail: |
| 433 | /* |
| 434 | * If we have failed part way through block allocation, we |
| 435 | * have to deallocate any indirect blocks that we have allocated. |
| 436 | */ |
| 437 | |
| 438 | if (unwindidx >= 0) { |
| 439 | |
| 440 | /* |
| 441 | * First write out any buffers we've created to resolve their |
| 442 | * softdeps. This must be done in reverse order of creation |
| 443 | * so that we resolve the dependencies in one pass. |
| 444 | * Write the cylinder group buffers for these buffers too. |
| 445 | */ |
| 446 | |
| 447 | for (i = num; i >= unwindidx; i--) { |
| 448 | if (i == 0) { |
| 449 | break; |
| 450 | } |
| 451 | if (ffs_getblk(vp, indirs[i].in_lbn, FFS_NOBLK, |
| 452 | fs->fs_bsize, false, &bp) != 0) |
| 453 | continue; |
| 454 | if (bp->b_oflags & BO_DELWRI) { |
| 455 | nb = FFS_FSBTODB(fs, cgtod(fs, dtog(fs, |
| 456 | FFS_DBTOFSB(fs, bp->b_blkno)))); |
| 457 | bwrite(bp); |
| 458 | if (ffs_getblk(ip->i_devvp, nb, FFS_NOBLK, |
| 459 | fs->fs_cgsize, false, &bp) != 0) |
| 460 | continue; |
| 461 | if (bp->b_oflags & BO_DELWRI) { |
| 462 | bwrite(bp); |
| 463 | } else { |
| 464 | brelse(bp, BC_INVAL); |
| 465 | } |
| 466 | } else { |
| 467 | brelse(bp, BC_INVAL); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * Undo the partial allocation. |
| 473 | */ |
| 474 | if (unwindidx == 0) { |
| 475 | *allocib = 0; |
| 476 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 477 | } else { |
| 478 | int r; |
| 479 | |
| 480 | r = bread(vp, indirs[unwindidx].in_lbn, |
| 481 | (int)fs->fs_bsize, 0, &bp); |
| 482 | if (r) { |
| 483 | panic("Could not unwind indirect block, error %d" , r); |
| 484 | } else { |
| 485 | bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ |
| 486 | bap[indirs[unwindidx].in_off] = 0; |
| 487 | bwrite(bp); |
| 488 | } |
| 489 | } |
| 490 | for (i = unwindidx + 1; i <= num; i++) { |
| 491 | if (ffs_getblk(vp, indirs[i].in_lbn, FFS_NOBLK, |
| 492 | fs->fs_bsize, false, &bp) == 0) |
| 493 | brelse(bp, BC_INVAL); |
| 494 | } |
| 495 | } |
| 496 | for (deallocated = 0, blkp = allociblk; blkp < allocblk; blkp++) { |
| 497 | ffs_blkfree(fs, ip->i_devvp, *blkp, fs->fs_bsize, ip->i_number); |
| 498 | deallocated += fs->fs_bsize; |
| 499 | } |
| 500 | if (deallocated) { |
| 501 | #if defined(QUOTA) || defined(QUOTA2) |
| 502 | /* |
| 503 | * Restore user's disk quota because allocation failed. |
| 504 | */ |
| 505 | (void)chkdq(ip, -btodb(deallocated), cred, FORCE); |
| 506 | #endif |
| 507 | ip->i_ffs1_blocks -= btodb(deallocated); |
| 508 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 509 | } |
| 510 | return (error); |
| 511 | } |
| 512 | |
| 513 | static int |
| 514 | ffs_balloc_ufs2(struct vnode *vp, off_t off, int size, kauth_cred_t cred, |
| 515 | int flags, struct buf **bpp) |
| 516 | { |
| 517 | daddr_t lbn, lastlbn; |
| 518 | struct buf *bp, *nbp; |
| 519 | struct inode *ip = VTOI(vp); |
| 520 | struct fs *fs = ip->i_fs; |
| 521 | struct ufsmount *ump = ip->i_ump; |
| 522 | struct indir indirs[UFS_NIADDR + 2]; |
| 523 | daddr_t newb, pref, nb; |
| 524 | int64_t *bap; |
| 525 | int deallocated, osize, nsize, num, i, error; |
| 526 | daddr_t *blkp, *allocblk, allociblk[UFS_NIADDR + 1]; |
| 527 | int64_t *allocib; |
| 528 | int unwindidx = -1; |
| 529 | const int needswap = UFS_FSNEEDSWAP(fs); |
| 530 | UVMHIST_FUNC("ffs_balloc" ); UVMHIST_CALLED(ubchist); |
| 531 | |
| 532 | lbn = ffs_lblkno(fs, off); |
| 533 | size = ffs_blkoff(fs, off) + size; |
| 534 | if (size > fs->fs_bsize) |
| 535 | panic("ffs_balloc: blk too big" ); |
| 536 | if (bpp != NULL) { |
| 537 | *bpp = NULL; |
| 538 | } |
| 539 | UVMHIST_LOG(ubchist, "vp %p lbn 0x%x size 0x%x" , vp, lbn, size,0); |
| 540 | |
| 541 | if (lbn < 0) |
| 542 | return (EFBIG); |
| 543 | |
| 544 | #ifdef notyet |
| 545 | /* |
| 546 | * Check for allocating external data. |
| 547 | */ |
| 548 | if (flags & IO_EXT) { |
| 549 | if (lbn >= UFS_NXADDR) |
| 550 | return (EFBIG); |
| 551 | /* |
| 552 | * If the next write will extend the data into a new block, |
| 553 | * and the data is currently composed of a fragment |
| 554 | * this fragment has to be extended to be a full block. |
| 555 | */ |
| 556 | lastlbn = ffs_lblkno(fs, dp->di_extsize); |
| 557 | if (lastlbn < lbn) { |
| 558 | nb = lastlbn; |
| 559 | osize = ffs_sblksize(fs, dp->di_extsize, nb); |
| 560 | if (osize < fs->fs_bsize && osize > 0) { |
| 561 | mutex_enter(&ump->um_lock); |
| 562 | error = ffs_realloccg(ip, -1 - nb, |
| 563 | dp->di_extb[nb], |
| 564 | ffs_blkpref_ufs2(ip, lastlbn, (int)nb, |
| 565 | flags, &dp->di_extb[0]), |
| 566 | osize, |
| 567 | (int)fs->fs_bsize, cred, &bp); |
| 568 | if (error) |
| 569 | return (error); |
| 570 | dp->di_extsize = smalllblktosize(fs, nb + 1); |
| 571 | dp->di_extb[nb] = FFS_DBTOFSB(fs, bp->b_blkno); |
| 572 | bp->b_xflags |= BX_ALTDATA; |
| 573 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 574 | if (flags & IO_SYNC) |
| 575 | bwrite(bp); |
| 576 | else |
| 577 | bawrite(bp); |
| 578 | } |
| 579 | } |
| 580 | /* |
| 581 | * All blocks are direct blocks |
| 582 | */ |
| 583 | if (flags & BA_METAONLY) |
| 584 | panic("ffs_balloc_ufs2: BA_METAONLY for ext block" ); |
| 585 | nb = dp->di_extb[lbn]; |
| 586 | if (nb != 0 && dp->di_extsize >= smalllblktosize(fs, lbn + 1)) { |
| 587 | error = bread(vp, -1 - lbn, fs->fs_bsize, |
| 588 | 0, &bp); |
| 589 | if (error) { |
| 590 | return (error); |
| 591 | } |
| 592 | mutex_enter(&bp->b_interlock); |
| 593 | bp->b_blkno = FFS_FSBTODB(fs, nb); |
| 594 | bp->b_xflags |= BX_ALTDATA; |
| 595 | mutex_exit(&bp->b_interlock); |
| 596 | *bpp = bp; |
| 597 | return (0); |
| 598 | } |
| 599 | if (nb != 0) { |
| 600 | /* |
| 601 | * Consider need to reallocate a fragment. |
| 602 | */ |
| 603 | osize = ffs_fragroundup(fs, ffs_blkoff(fs, dp->di_extsize)); |
| 604 | nsize = ffs_fragroundup(fs, size); |
| 605 | if (nsize <= osize) { |
| 606 | error = bread(vp, -1 - lbn, osize, |
| 607 | 0, &bp); |
| 608 | if (error) { |
| 609 | return (error); |
| 610 | } |
| 611 | mutex_enter(&bp->b_interlock); |
| 612 | bp->b_blkno = FFS_FSBTODB(fs, nb); |
| 613 | bp->b_xflags |= BX_ALTDATA; |
| 614 | mutex_exit(&bp->b_interlock); |
| 615 | } else { |
| 616 | mutex_enter(&ump->um_lock); |
| 617 | error = ffs_realloccg(ip, -1 - lbn, |
| 618 | dp->di_extb[lbn], |
| 619 | ffs_blkpref_ufs2(ip, lbn, (int)lbn, flags, |
| 620 | &dp->di_extb[0]), |
| 621 | osize, nsize, cred, &bp); |
| 622 | if (error) |
| 623 | return (error); |
| 624 | bp->b_xflags |= BX_ALTDATA; |
| 625 | } |
| 626 | } else { |
| 627 | if (dp->di_extsize < smalllblktosize(fs, lbn + 1)) |
| 628 | nsize = ffs_fragroundup(fs, size); |
| 629 | else |
| 630 | nsize = fs->fs_bsize; |
| 631 | mutex_enter(&ump->um_lock); |
| 632 | error = ffs_alloc(ip, lbn, |
| 633 | ffs_blkpref_ufs2(ip, lbn, (int)lbn, flags, |
| 634 | &dp->di_extb[0]), |
| 635 | nsize, flags, cred, &newb); |
| 636 | if (error) |
| 637 | return (error); |
| 638 | error = ffs_getblk(vp, -1 - lbn, FFS_FSBTODB(fs, newb), |
| 639 | nsize, (flags & B_CLRBUF) != 0, &bp); |
| 640 | if (error) |
| 641 | return error; |
| 642 | bp->b_xflags |= BX_ALTDATA; |
| 643 | } |
| 644 | dp->di_extb[lbn] = FFS_DBTOFSB(fs, bp->b_blkno); |
| 645 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 646 | *bpp = bp; |
| 647 | return (0); |
| 648 | } |
| 649 | #endif |
| 650 | /* |
| 651 | * If the next write will extend the file into a new block, |
| 652 | * and the file is currently composed of a fragment |
| 653 | * this fragment has to be extended to be a full block. |
| 654 | */ |
| 655 | |
| 656 | lastlbn = ffs_lblkno(fs, ip->i_size); |
| 657 | if (lastlbn < UFS_NDADDR && lastlbn < lbn) { |
| 658 | nb = lastlbn; |
| 659 | osize = ffs_blksize(fs, ip, nb); |
| 660 | if (osize < fs->fs_bsize && osize > 0) { |
| 661 | mutex_enter(&ump->um_lock); |
| 662 | error = ffs_realloccg(ip, nb, |
| 663 | ffs_blkpref_ufs2(ip, lastlbn, nb, flags, |
| 664 | &ip->i_ffs2_db[0]), |
| 665 | osize, (int)fs->fs_bsize, cred, bpp, &newb); |
| 666 | if (error) |
| 667 | return (error); |
| 668 | ip->i_size = ffs_lblktosize(fs, nb + 1); |
| 669 | ip->i_ffs2_size = ip->i_size; |
| 670 | uvm_vnp_setsize(vp, ip->i_size); |
| 671 | ip->i_ffs2_db[nb] = ufs_rw64(newb, needswap); |
| 672 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 673 | if (bpp) { |
| 674 | if (flags & B_SYNC) |
| 675 | bwrite(*bpp); |
| 676 | else |
| 677 | bawrite(*bpp); |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * The first UFS_NDADDR blocks are direct blocks |
| 684 | */ |
| 685 | |
| 686 | if (lbn < UFS_NDADDR) { |
| 687 | nb = ufs_rw64(ip->i_ffs2_db[lbn], needswap); |
| 688 | if (nb != 0 && ip->i_size >= ffs_lblktosize(fs, lbn + 1)) { |
| 689 | |
| 690 | /* |
| 691 | * The block is an already-allocated direct block |
| 692 | * and the file already extends past this block, |
| 693 | * thus this must be a whole block. |
| 694 | * Just read the block (if requested). |
| 695 | */ |
| 696 | |
| 697 | if (bpp != NULL) { |
| 698 | error = bread(vp, lbn, fs->fs_bsize, |
| 699 | B_MODIFY, bpp); |
| 700 | if (error) { |
| 701 | return (error); |
| 702 | } |
| 703 | } |
| 704 | return (0); |
| 705 | } |
| 706 | if (nb != 0) { |
| 707 | |
| 708 | /* |
| 709 | * Consider need to reallocate a fragment. |
| 710 | */ |
| 711 | |
| 712 | osize = ffs_fragroundup(fs, ffs_blkoff(fs, ip->i_size)); |
| 713 | nsize = ffs_fragroundup(fs, size); |
| 714 | if (nsize <= osize) { |
| 715 | |
| 716 | /* |
| 717 | * The existing block is already |
| 718 | * at least as big as we want. |
| 719 | * Just read the block (if requested). |
| 720 | */ |
| 721 | |
| 722 | if (bpp != NULL) { |
| 723 | error = bread(vp, lbn, osize, |
| 724 | B_MODIFY, bpp); |
| 725 | if (error) { |
| 726 | return (error); |
| 727 | } |
| 728 | } |
| 729 | return 0; |
| 730 | } else { |
| 731 | |
| 732 | /* |
| 733 | * The existing block is smaller than we want, |
| 734 | * grow it. |
| 735 | */ |
| 736 | mutex_enter(&ump->um_lock); |
| 737 | error = ffs_realloccg(ip, lbn, |
| 738 | ffs_blkpref_ufs2(ip, lbn, (int)lbn, flags, |
| 739 | &ip->i_ffs2_db[0]), |
| 740 | osize, nsize, cred, bpp, &newb); |
| 741 | if (error) |
| 742 | return (error); |
| 743 | } |
| 744 | } else { |
| 745 | |
| 746 | /* |
| 747 | * the block was not previously allocated, |
| 748 | * allocate a new block or fragment. |
| 749 | */ |
| 750 | |
| 751 | if (ip->i_size < ffs_lblktosize(fs, lbn + 1)) |
| 752 | nsize = ffs_fragroundup(fs, size); |
| 753 | else |
| 754 | nsize = fs->fs_bsize; |
| 755 | mutex_enter(&ump->um_lock); |
| 756 | error = ffs_alloc(ip, lbn, |
| 757 | ffs_blkpref_ufs2(ip, lbn, (int)lbn, flags, |
| 758 | &ip->i_ffs2_db[0]), |
| 759 | nsize, flags, cred, &newb); |
| 760 | if (error) |
| 761 | return (error); |
| 762 | if (bpp != NULL) { |
| 763 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, newb), |
| 764 | nsize, (flags & B_CLRBUF) != 0, bpp); |
| 765 | if (error) |
| 766 | return error; |
| 767 | } |
| 768 | } |
| 769 | ip->i_ffs2_db[lbn] = ufs_rw64(newb, needswap); |
| 770 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 771 | return (0); |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Determine the number of levels of indirection. |
| 776 | */ |
| 777 | |
| 778 | pref = 0; |
| 779 | if ((error = ufs_getlbns(vp, lbn, indirs, &num)) != 0) |
| 780 | return (error); |
| 781 | |
| 782 | /* |
| 783 | * Fetch the first indirect block allocating if necessary. |
| 784 | */ |
| 785 | |
| 786 | --num; |
| 787 | nb = ufs_rw64(ip->i_ffs2_ib[indirs[0].in_off], needswap); |
| 788 | allocib = NULL; |
| 789 | allocblk = allociblk; |
| 790 | if (nb == 0) { |
| 791 | mutex_enter(&ump->um_lock); |
| 792 | pref = ffs_blkpref_ufs2(ip, lbn, 0, flags | B_METAONLY, NULL); |
| 793 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, |
| 794 | flags | B_METAONLY, cred, &newb); |
| 795 | if (error) |
| 796 | goto fail; |
| 797 | nb = newb; |
| 798 | *allocblk++ = nb; |
| 799 | error = ffs_getblk(vp, indirs[1].in_lbn, FFS_FSBTODB(fs, nb), |
| 800 | fs->fs_bsize, true, &bp); |
| 801 | if (error) |
| 802 | goto fail; |
| 803 | /* |
| 804 | * Write synchronously so that indirect blocks |
| 805 | * never point at garbage. |
| 806 | */ |
| 807 | if ((error = bwrite(bp)) != 0) |
| 808 | goto fail; |
| 809 | unwindidx = 0; |
| 810 | allocib = &ip->i_ffs2_ib[indirs[0].in_off]; |
| 811 | *allocib = ufs_rw64(nb, needswap); |
| 812 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * Fetch through the indirect blocks, allocating as necessary. |
| 817 | */ |
| 818 | |
| 819 | for (i = 1;;) { |
| 820 | error = bread(vp, |
| 821 | indirs[i].in_lbn, (int)fs->fs_bsize, 0, &bp); |
| 822 | if (error) { |
| 823 | goto fail; |
| 824 | } |
| 825 | bap = (int64_t *)bp->b_data; |
| 826 | nb = ufs_rw64(bap[indirs[i].in_off], needswap); |
| 827 | if (i == num) |
| 828 | break; |
| 829 | i++; |
| 830 | if (nb != 0) { |
| 831 | brelse(bp, 0); |
| 832 | continue; |
| 833 | } |
| 834 | if (fscow_run(bp, true) != 0) { |
| 835 | brelse(bp, 0); |
| 836 | goto fail; |
| 837 | } |
| 838 | mutex_enter(&ump->um_lock); |
| 839 | /* Try to keep snapshot indirect blocks contiguous. */ |
| 840 | if (i == num && (ip->i_flags & SF_SNAPSHOT) != 0) |
| 841 | pref = ffs_blkpref_ufs2(ip, lbn, indirs[i-1].in_off, |
| 842 | flags | B_METAONLY, &bap[0]); |
| 843 | if (pref == 0) |
| 844 | pref = ffs_blkpref_ufs2(ip, lbn, 0, flags | B_METAONLY, |
| 845 | NULL); |
| 846 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, |
| 847 | flags | B_METAONLY, cred, &newb); |
| 848 | if (error) { |
| 849 | brelse(bp, 0); |
| 850 | goto fail; |
| 851 | } |
| 852 | nb = newb; |
| 853 | *allocblk++ = nb; |
| 854 | error = ffs_getblk(vp, indirs[i].in_lbn, FFS_FSBTODB(fs, nb), |
| 855 | fs->fs_bsize, true, &nbp); |
| 856 | if (error) { |
| 857 | brelse(bp, 0); |
| 858 | goto fail; |
| 859 | } |
| 860 | /* |
| 861 | * Write synchronously so that indirect blocks |
| 862 | * never point at garbage. |
| 863 | */ |
| 864 | if ((error = bwrite(nbp)) != 0) { |
| 865 | brelse(bp, 0); |
| 866 | goto fail; |
| 867 | } |
| 868 | if (unwindidx < 0) |
| 869 | unwindidx = i - 1; |
| 870 | bap[indirs[i - 1].in_off] = ufs_rw64(nb, needswap); |
| 871 | |
| 872 | /* |
| 873 | * If required, write synchronously, otherwise use |
| 874 | * delayed write. |
| 875 | */ |
| 876 | |
| 877 | if (flags & B_SYNC) { |
| 878 | bwrite(bp); |
| 879 | } else { |
| 880 | bdwrite(bp); |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | if (flags & B_METAONLY) { |
| 885 | KASSERT(bpp != NULL); |
| 886 | *bpp = bp; |
| 887 | return (0); |
| 888 | } |
| 889 | |
| 890 | /* |
| 891 | * Get the data block, allocating if necessary. |
| 892 | */ |
| 893 | |
| 894 | if (nb == 0) { |
| 895 | if (fscow_run(bp, true) != 0) { |
| 896 | brelse(bp, 0); |
| 897 | goto fail; |
| 898 | } |
| 899 | mutex_enter(&ump->um_lock); |
| 900 | pref = ffs_blkpref_ufs2(ip, lbn, indirs[num].in_off, flags, |
| 901 | &bap[0]); |
| 902 | error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, flags, cred, |
| 903 | &newb); |
| 904 | if (error) { |
| 905 | brelse(bp, 0); |
| 906 | goto fail; |
| 907 | } |
| 908 | nb = newb; |
| 909 | *allocblk++ = nb; |
| 910 | if (bpp != NULL) { |
| 911 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, nb), |
| 912 | fs->fs_bsize, (flags & B_CLRBUF) != 0, bpp); |
| 913 | if (error) { |
| 914 | brelse(bp, 0); |
| 915 | goto fail; |
| 916 | } |
| 917 | } |
| 918 | bap[indirs[num].in_off] = ufs_rw64(nb, needswap); |
| 919 | if (allocib == NULL && unwindidx < 0) { |
| 920 | unwindidx = i - 1; |
| 921 | } |
| 922 | |
| 923 | /* |
| 924 | * If required, write synchronously, otherwise use |
| 925 | * delayed write. |
| 926 | */ |
| 927 | |
| 928 | if (flags & B_SYNC) { |
| 929 | bwrite(bp); |
| 930 | } else { |
| 931 | bdwrite(bp); |
| 932 | } |
| 933 | return (0); |
| 934 | } |
| 935 | brelse(bp, 0); |
| 936 | if (bpp != NULL) { |
| 937 | if (flags & B_CLRBUF) { |
| 938 | error = bread(vp, lbn, (int)fs->fs_bsize, |
| 939 | B_MODIFY, &nbp); |
| 940 | if (error) { |
| 941 | goto fail; |
| 942 | } |
| 943 | } else { |
| 944 | error = ffs_getblk(vp, lbn, FFS_FSBTODB(fs, nb), |
| 945 | fs->fs_bsize, true, &nbp); |
| 946 | if (error) |
| 947 | goto fail; |
| 948 | } |
| 949 | *bpp = nbp; |
| 950 | } |
| 951 | return (0); |
| 952 | |
| 953 | fail: |
| 954 | /* |
| 955 | * If we have failed part way through block allocation, we |
| 956 | * have to deallocate any indirect blocks that we have allocated. |
| 957 | */ |
| 958 | |
| 959 | if (unwindidx >= 0) { |
| 960 | |
| 961 | /* |
| 962 | * First write out any buffers we've created to resolve their |
| 963 | * softdeps. This must be done in reverse order of creation |
| 964 | * so that we resolve the dependencies in one pass. |
| 965 | * Write the cylinder group buffers for these buffers too. |
| 966 | */ |
| 967 | |
| 968 | for (i = num; i >= unwindidx; i--) { |
| 969 | if (i == 0) { |
| 970 | break; |
| 971 | } |
| 972 | if (ffs_getblk(vp, indirs[i].in_lbn, FFS_NOBLK, |
| 973 | fs->fs_bsize, false, &bp) != 0) |
| 974 | continue; |
| 975 | if (bp->b_oflags & BO_DELWRI) { |
| 976 | nb = FFS_FSBTODB(fs, cgtod(fs, dtog(fs, |
| 977 | FFS_DBTOFSB(fs, bp->b_blkno)))); |
| 978 | bwrite(bp); |
| 979 | if (ffs_getblk(ip->i_devvp, nb, FFS_NOBLK, |
| 980 | fs->fs_cgsize, false, &bp) != 0) |
| 981 | continue; |
| 982 | if (bp->b_oflags & BO_DELWRI) { |
| 983 | bwrite(bp); |
| 984 | } else { |
| 985 | brelse(bp, BC_INVAL); |
| 986 | } |
| 987 | } else { |
| 988 | brelse(bp, BC_INVAL); |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | /* |
| 993 | * Now that any dependencies that we created have been |
| 994 | * resolved, we can undo the partial allocation. |
| 995 | */ |
| 996 | |
| 997 | if (unwindidx == 0) { |
| 998 | *allocib = 0; |
| 999 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 1000 | } else { |
| 1001 | int r; |
| 1002 | |
| 1003 | r = bread(vp, indirs[unwindidx].in_lbn, |
| 1004 | (int)fs->fs_bsize, 0, &bp); |
| 1005 | if (r) { |
| 1006 | panic("Could not unwind indirect block, error %d" , r); |
| 1007 | } else { |
| 1008 | bap = (int64_t *)bp->b_data; |
| 1009 | bap[indirs[unwindidx].in_off] = 0; |
| 1010 | bwrite(bp); |
| 1011 | } |
| 1012 | } |
| 1013 | for (i = unwindidx + 1; i <= num; i++) { |
| 1014 | if (ffs_getblk(vp, indirs[i].in_lbn, FFS_NOBLK, |
| 1015 | fs->fs_bsize, false, &bp) == 0) |
| 1016 | brelse(bp, BC_INVAL); |
| 1017 | } |
| 1018 | } |
| 1019 | for (deallocated = 0, blkp = allociblk; blkp < allocblk; blkp++) { |
| 1020 | ffs_blkfree(fs, ip->i_devvp, *blkp, fs->fs_bsize, ip->i_number); |
| 1021 | deallocated += fs->fs_bsize; |
| 1022 | } |
| 1023 | if (deallocated) { |
| 1024 | #if defined(QUOTA) || defined(QUOTA2) |
| 1025 | /* |
| 1026 | * Restore user's disk quota because allocation failed. |
| 1027 | */ |
| 1028 | (void)chkdq(ip, -btodb(deallocated), cred, FORCE); |
| 1029 | #endif |
| 1030 | ip->i_ffs2_blocks -= btodb(deallocated); |
| 1031 | ip->i_flag |= IN_CHANGE | IN_UPDATE; |
| 1032 | } |
| 1033 | |
| 1034 | return (error); |
| 1035 | } |
| 1036 | |