ext2fs_balloc.c revision 1.25.4.3
1 /* $NetBSD: ext2fs_balloc.c,v 1.25.4.3 2007/10/27 11:36:38 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93 32 * Modified for ext2fs by Manuel Bouyer. 33 */ 34 35 /* 36 * Copyright (c) 1997 Manuel Bouyer. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by Manuel Bouyer. 49 * 4. The name of the author may not be used to endorse or promote products 50 * derived from this software without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_balloc.c,v 1.25.4.3 2007/10/27 11:36:38 yamt Exp $"); 69 70 #if defined(_KERNEL_OPT) 71 #include "opt_uvmhist.h" 72 #endif 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/buf.h> 77 #include <sys/proc.h> 78 #include <sys/file.h> 79 #include <sys/vnode.h> 80 #include <sys/mount.h> 81 #include <sys/kauth.h> 82 83 #include <uvm/uvm.h> 84 85 #include <ufs/ufs/inode.h> 86 #include <ufs/ufs/ufs_extern.h> 87 88 #include <ufs/ext2fs/ext2fs.h> 89 #include <ufs/ext2fs/ext2fs_extern.h> 90 91 /* 92 * Balloc defines the structure of file system storage 93 * by allocating the physical blocks on a device given 94 * the inode and the logical block number in a file. 95 */ 96 int 97 ext2fs_balloc(struct inode *ip, daddr_t bn, int size, 98 kauth_cred_t cred, struct buf **bpp, int flags) 99 { 100 struct m_ext2fs *fs; 101 daddr_t nb; 102 struct buf *bp, *nbp; 103 struct vnode *vp = ITOV(ip); 104 struct indir indirs[NIADDR + 2]; 105 daddr_t newb, lbn, pref; 106 int32_t *bap; /* XXX ondisk32 */ 107 int num, i, error; 108 u_int deallocated; 109 daddr_t *blkp, *allocblk, allociblk[NIADDR + 1]; 110 int32_t *allocib; /* XXX ondisk32 */ 111 int unwindidx = -1; 112 UVMHIST_FUNC("ext2fs_balloc"); UVMHIST_CALLED(ubchist); 113 114 UVMHIST_LOG(ubchist, "bn 0x%x", bn,0,0,0); 115 116 if (bpp != NULL) { 117 *bpp = NULL; 118 } 119 if (bn < 0) 120 return (EFBIG); 121 fs = ip->i_e2fs; 122 lbn = bn; 123 124 /* 125 * The first NDADDR blocks are direct blocks 126 */ 127 if (bn < NDADDR) { 128 /* XXX ondisk32 */ 129 nb = fs2h32(ip->i_e2fs_blocks[bn]); 130 if (nb != 0) { 131 132 /* 133 * the block is already allocated, just read it. 134 */ 135 136 if (bpp != NULL) { 137 error = bread(vp, bn, fs->e2fs_bsize, NOCRED, 138 &bp); 139 if (error) { 140 brelse(bp, 0); 141 return (error); 142 } 143 *bpp = bp; 144 } 145 return (0); 146 } 147 148 /* 149 * allocate a new direct block. 150 */ 151 152 error = ext2fs_alloc(ip, bn, 153 ext2fs_blkpref(ip, bn, bn, &ip->i_e2fs_blocks[0]), 154 cred, &newb); 155 if (error) 156 return (error); 157 ip->i_e2fs_last_lblk = lbn; 158 ip->i_e2fs_last_blk = newb; 159 /* XXX ondisk32 */ 160 ip->i_e2fs_blocks[bn] = h2fs32((int32_t)newb); 161 ip->i_flag |= IN_CHANGE | IN_UPDATE; 162 if (bpp != NULL) { 163 bp = getblk(vp, bn, fs->e2fs_bsize, 0, 0); 164 bp->b_blkno = fsbtodb(fs, newb); 165 if (flags & B_CLRBUF) 166 clrbuf(bp); 167 *bpp = bp; 168 } 169 return (0); 170 } 171 /* 172 * Determine the number of levels of indirection. 173 */ 174 pref = 0; 175 if ((error = ufs_getlbns(vp, bn, indirs, &num)) != 0) 176 return(error); 177 #ifdef DIAGNOSTIC 178 if (num < 1) 179 panic ("ext2fs_balloc: ufs_getlbns returned indirect block\n"); 180 #endif 181 /* 182 * Fetch the first indirect block allocating if necessary. 183 */ 184 --num; 185 /* XXX ondisk32 */ 186 nb = fs2h32(ip->i_e2fs_blocks[NDADDR + indirs[0].in_off]); 187 allocib = NULL; 188 allocblk = allociblk; 189 if (nb == 0) { 190 pref = ext2fs_blkpref(ip, lbn, 0, (int32_t *)0); 191 error = ext2fs_alloc(ip, lbn, pref, cred, &newb); 192 if (error) 193 return (error); 194 nb = newb; 195 *allocblk++ = nb; 196 ip->i_e2fs_last_blk = newb; 197 bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0); 198 bp->b_blkno = fsbtodb(fs, newb); 199 clrbuf(bp); 200 /* 201 * Write synchronously so that indirect blocks 202 * never point at garbage. 203 */ 204 if ((error = bwrite(bp)) != 0) 205 goto fail; 206 unwindidx = 0; 207 allocib = &ip->i_e2fs_blocks[NDADDR + indirs[0].in_off]; 208 /* XXX ondisk32 */ 209 *allocib = h2fs32((int32_t)newb); 210 ip->i_flag |= IN_CHANGE | IN_UPDATE; 211 } 212 /* 213 * Fetch through the indirect blocks, allocating as necessary. 214 */ 215 for (i = 1;;) { 216 error = bread(vp, 217 indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp); 218 if (error) { 219 brelse(bp, 0); 220 goto fail; 221 } 222 bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ 223 nb = fs2h32(bap[indirs[i].in_off]); 224 if (i == num) 225 break; 226 i++; 227 if (nb != 0) { 228 brelse(bp, 0); 229 continue; 230 } 231 pref = ext2fs_blkpref(ip, lbn, 0, (int32_t *)0); 232 error = ext2fs_alloc(ip, lbn, pref, cred, &newb); 233 if (error) { 234 brelse(bp, 0); 235 goto fail; 236 } 237 nb = newb; 238 *allocblk++ = nb; 239 ip->i_e2fs_last_blk = newb; 240 nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0); 241 nbp->b_blkno = fsbtodb(fs, nb); 242 clrbuf(nbp); 243 /* 244 * Write synchronously so that indirect blocks 245 * never point at garbage. 246 */ 247 if ((error = bwrite(nbp)) != 0) { 248 brelse(bp, 0); 249 goto fail; 250 } 251 if (unwindidx < 0) 252 unwindidx = i - 1; 253 /* XXX ondisk32 */ 254 bap[indirs[i - 1].in_off] = h2fs32((int32_t)nb); 255 /* 256 * If required, write synchronously, otherwise use 257 * delayed write. 258 */ 259 if (flags & B_SYNC) { 260 bwrite(bp); 261 } else { 262 bdwrite(bp); 263 } 264 } 265 /* 266 * Get the data block, allocating if necessary. 267 */ 268 if (nb == 0) { 269 pref = ext2fs_blkpref(ip, lbn, indirs[num].in_off, &bap[0]); 270 error = ext2fs_alloc(ip, lbn, pref, cred, &newb); 271 if (error) { 272 brelse(bp, 0); 273 goto fail; 274 } 275 nb = newb; 276 *allocblk++ = nb; 277 ip->i_e2fs_last_lblk = lbn; 278 ip->i_e2fs_last_blk = newb; 279 /* XXX ondisk32 */ 280 bap[indirs[num].in_off] = h2fs32((int32_t)nb); 281 /* 282 * If required, write synchronously, otherwise use 283 * delayed write. 284 */ 285 if (flags & B_SYNC) { 286 bwrite(bp); 287 } else { 288 bdwrite(bp); 289 } 290 if (bpp != NULL) { 291 nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0); 292 nbp->b_blkno = fsbtodb(fs, nb); 293 if (flags & B_CLRBUF) 294 clrbuf(nbp); 295 *bpp = nbp; 296 } 297 return (0); 298 } 299 brelse(bp, 0); 300 if (bpp != NULL) { 301 if (flags & B_CLRBUF) { 302 error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED, 303 &nbp); 304 if (error) { 305 brelse(nbp, 0); 306 goto fail; 307 } 308 } else { 309 nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0); 310 nbp->b_blkno = fsbtodb(fs, nb); 311 } 312 *bpp = nbp; 313 } 314 return (0); 315 fail: 316 /* 317 * If we have failed part way through block allocation, we 318 * have to deallocate any indirect blocks that we have allocated. 319 */ 320 for (deallocated = 0, blkp = allociblk; blkp < allocblk; blkp++) { 321 ext2fs_blkfree(ip, *blkp); 322 deallocated += fs->e2fs_bsize; 323 } 324 if (unwindidx >= 0) { 325 if (unwindidx == 0) { 326 *allocib = 0; 327 } else { 328 int r; 329 330 r = bread(vp, indirs[unwindidx].in_lbn, 331 (int)fs->e2fs_bsize, NOCRED, &bp); 332 if (r) { 333 panic("Could not unwind indirect block, error %d", r); 334 brelse(bp, 0); 335 } else { 336 bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ 337 bap[indirs[unwindidx].in_off] = 0; 338 if (flags & B_SYNC) 339 bwrite(bp); 340 else 341 bdwrite(bp); 342 } 343 } 344 for (i = unwindidx + 1; i <= num; i++) { 345 bp = getblk(vp, indirs[i].in_lbn, (int)fs->e2fs_bsize, 346 0, 0); 347 brelse(bp, BC_INVAL); 348 } 349 } 350 if (deallocated) { 351 ip->i_e2fs_nblock -= btodb(deallocated); 352 ip->i_e2fs_flags |= IN_CHANGE | IN_UPDATE; 353 } 354 return error; 355 } 356 357 int 358 ext2fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 359 kauth_cred_t cred) 360 { 361 struct inode *ip = VTOI(vp); 362 struct m_ext2fs *fs = ip->i_e2fs; 363 int error, delta, bshift, bsize; 364 UVMHIST_FUNC("ext2fs_gop_alloc"); UVMHIST_CALLED(ubchist); 365 366 bshift = fs->e2fs_bshift; 367 bsize = 1 << bshift; 368 369 delta = off & (bsize - 1); 370 off -= delta; 371 len += delta; 372 373 while (len > 0) { 374 bsize = min(bsize, len); 375 UVMHIST_LOG(ubchist, "off 0x%x len 0x%x bsize 0x%x", 376 off, len, bsize, 0); 377 378 error = ext2fs_balloc(ip, lblkno(fs, off), bsize, cred, 379 NULL, flags); 380 if (error) { 381 UVMHIST_LOG(ubchist, "error %d", error, 0,0,0); 382 return error; 383 } 384 385 /* 386 * increase file size now, ext2fs_balloc() requires that 387 * EOF be up-to-date before each call. 388 */ 389 390 if (ext2fs_size(ip) < off + bsize) { 391 UVMHIST_LOG(ubchist, "old 0x%lx%8lx new 0x%lx%8lx", 392 /* Note that arguments are always cast to u_long. */ 393 ext2fs_size(ip) >> 32, 394 ext2fs_size(ip) & 0xffffffff, 395 (off + bsize) >> 32, 396 (off + bsize) & 0xffffffff); 397 error = ext2fs_setsize(ip, off + bsize); 398 if (error) { 399 UVMHIST_LOG(ubchist, "error %d", error, 0,0,0); 400 return error; 401 } 402 } 403 404 off += bsize; 405 len -= bsize; 406 } 407 return 0; 408 } 409
Indexes created Mon Oct 20 11:09:49 GMT 2025