1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)lfs.c 5.8 (Berkeley) 04/22/92"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/uio.h> 14 #include <sys/disklabel.h> 15 #include <sys/time.h> 16 #include <sys/resource.h> 17 #include <sys/proc.h> 18 #include <sys/vnode.h> 19 #include <sys/mount.h> 20 21 #include <ufs/ufs/dir.h> 22 #include <ufs/ufs/quota.h> 23 #include <ufs/ufs/dinode.h> 24 #include <ufs/ufs/ufsmount.h> 25 #include <ufs/lfs/lfs.h> 26 27 #include <unistd.h> 28 #include <errno.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include "config.h" 32 #include "extern.h" 33 34 static struct lfs lfs_default = { 35 /* lfs_magic */ LFS_MAGIC, 36 /* lfs_version */ LFS_VERSION, 37 /* lfs_size */ 0, 38 /* lfs_ssize */ DFL_LFSSEG/DFL_LFSBLOCK, 39 /* lfs_dsize */ 0, 40 /* lfs_bsize */ DFL_LFSBLOCK, 41 /* lfs_fsize */ DFL_LFSBLOCK, 42 /* lfs_frag */ 1, 43 /* lfs_free */ LFS_FIRST_INUM, 44 /* lfs_bfree */ 0, 45 /* lfs_nfiles */ 0, 46 /* lfs_idaddr */ 0, 47 /* lfs_ifile */ LFS_IFILE_INUM, 48 /* lfs_lastseg */ 0, 49 /* lfs_nextseg */ 0, 50 /* lfs_curseg */ 0, 51 /* lfs_offset */ 0, 52 /* lfs_tstamp */ 0, 53 /* lfs_minfree */ MINFREE, 54 /* lfs_dbpseg */ DFL_LFSSEG/DEV_BSIZE, 55 /* lfs_inopb */ DFL_LFSBLOCK/sizeof(struct dinode), 56 /* lfs_ifpb */ DFL_LFSBLOCK/sizeof(IFILE), 57 /* lfs_sepb */ DFL_LFSBLOCK/sizeof(SEGUSE), 58 /* lfs_nindir */ DFL_LFSBLOCK/sizeof(daddr_t), 59 /* lfs_nseg */ 0, 60 /* lfs_nspf */ 0, 61 /* lfs_cleansz */ 0, 62 /* lfs_segtabsz */ 0, 63 /* lfs_segmask */ DFL_LFSSEG_MASK, 64 /* lfs_segshift */ DFL_LFSSEG_SHIFT, 65 /* lfs_bmask */ DFL_LFSBLOCK_MASK, 66 /* lfs_bshift */ DFL_LFSBLOCK_SHIFT, 67 /* lfs_ffmask */ 0, 68 /* lfs_ffshift */ 0, 69 /* lfs_fbmask */ 0, 70 /* lfs_fbshift */ 0, 71 /* lfs_fsbtodb */ 0, 72 /* lfs_sboffs */ { 0 }, 73 /* lfs_ivnode */ NULL, 74 /* lfs_segtab */ NULL, 75 /* lfs_seglist */ NULL, 76 /* lfs_iocount */ 0, 77 /* lfs_fmod */ 0, 78 /* lfs_clean */ 0, 79 /* lfs_ronly */ 0, 80 /* lfs_flags */ 0, 81 /* lfs_fsmnt */ { 0 }, 82 /* lfs_pad */ { 0 }, 83 /* lfs_cksum */ 0 84 }; 85 86 87 struct direct lfs_root_dir[] = { 88 { ROOTINO, sizeof(struct direct), 1, "."}, 89 { ROOTINO, sizeof(struct direct), 2, ".."}, 90 { LFS_IFILE_INUM, sizeof(struct direct), 5, "ifile"}, 91 { LOSTFOUNDINO, sizeof(struct direct), 10, "lost+found"}, 92 }; 93 94 struct direct lfs_lf_dir[] = { 95 { LOSTFOUNDINO, sizeof(struct direct), 1, "." }, 96 { ROOTINO, sizeof(struct direct), 2, ".." }, 97 }; 98 99 static daddr_t make_dinode 100 __P((ino_t, struct dinode *, int, daddr_t, struct lfs *)); 101 static void make_dir __P(( void *, struct direct *, int)); 102 static void put __P((int, off_t, void *, size_t)); 103 104 int 105 make_lfs(fd, lp, partp, minfree, block_size, seg_size) 106 int fd; 107 struct disklabel *lp; 108 struct partition *partp; 109 int minfree; 110 int block_size; 111 int seg_size; 112 { 113 struct dinode *dip; /* Pointer to a disk inode */ 114 struct dinode *dpagep; /* Pointer to page of disk inodes */ 115 CLEANERINFO *cleaninfo; /* Segment cleaner information table */ 116 FINFO file_info; /* File info structure in summary blocks */ 117 IFILE *ifile; /* Pointer to array of ifile structures */ 118 IFILE *ip; /* Pointer to array of ifile structures */ 119 struct lfs *lfsp; /* Superblock */ 120 SEGUSE *segp; /* Segment usage table */ 121 SEGUSE *segtable; /* Segment usage table */ 122 SEGSUM summary; /* Segment summary structure */ 123 SEGSUM *sp; /* Segment summary pointer */ 124 daddr_t last_sb_addr; /* Address of superblocks */ 125 daddr_t last_addr; /* Previous segment address */ 126 daddr_t sb_addr; /* Address of superblocks */ 127 daddr_t seg_addr; /* Address of current segment */ 128 void *ipagep; /* Pointer to the page we use to write stuff */ 129 void *sump; /* Used to copy stuff into segment buffer */ 130 u_long *block_array; /* Array of logical block nos to put in sum */ 131 u_long blocks_used; /* Number of blocks in first segment */ 132 u_long *dp; /* Used to computed checksum on data */ 133 u_long *datasump; /* Used to computed checksum on data */ 134 int block_array_size; /* How many entries in block array */ 135 int bsize; /* Block size */ 136 int db_per_fb; /* Disk blocks per file block */ 137 int i, j; 138 int off; /* Offset at which to write */ 139 int sb_to_sum; /* offset between superblock and summary */ 140 int sb_interval; /* number of segs between super blocks */ 141 int seg_seek; /* Seek offset for a segment */ 142 int ssize; /* Segment size */ 143 int sum_size; /* Size of the summary block */ 144 int wbytes; /* Number of bytes returned by write */ 145 146 lfsp = &lfs_default; 147 148 if (!(bsize = block_size)) 149 bsize = DFL_LFSBLOCK; 150 if (!(ssize = seg_size)) 151 ssize = DFL_LFSSEG; 152 153 /* Modify parts of superblock overridden by command line arguments */ 154 if (bsize != DFL_LFSBLOCK) { 155 lfsp->lfs_bshift = log2(bsize); 156 if (1 << lfsp->lfs_bshift != bsize) 157 fatal("%d: block size not a power of 2", bsize); 158 lfsp->lfs_bsize = bsize; 159 lfsp->lfs_fsize = bsize; 160 lfsp->lfs_bmask = bsize - 1; 161 lfsp->lfs_inopb = bsize / sizeof(struct dinode); 162 /* MIS -- should I round to power of 2 */ 163 lfsp->lfs_ifpb = bsize / sizeof(IFILE); 164 lfsp->lfs_sepb = bsize / sizeof(SEGUSE); 165 lfsp->lfs_nindir = bsize / sizeof(daddr_t); 166 } 167 168 if (ssize != DFL_LFSSEG) { 169 lfsp->lfs_segshift = log2(ssize); 170 if (1 << lfsp->lfs_segshift != ssize) 171 fatal("%d: segment size not power of 2", ssize); 172 lfsp->lfs_ssize = ssize; 173 lfsp->lfs_segmask = ssize - 1; 174 } 175 lfsp->lfs_ssize = ssize >> lfsp->lfs_bshift; 176 177 if (minfree) 178 lfsp->lfs_minfree = minfree; 179 180 /* 181 * Fill in parts of superblock that can be computed from file system 182 * size, disk geometry and current time. 183 */ 184 db_per_fb = bsize/lp->d_secsize; 185 lfsp->lfs_fsbtodb = log2(db_per_fb); 186 lfsp->lfs_size = partp->p_size >> lfsp->lfs_fsbtodb; 187 lfsp->lfs_dsize = lfsp->lfs_size - (LFS_LABELPAD >> lfsp->lfs_bshift); 188 lfsp->lfs_nseg = lfsp->lfs_dsize / lfsp->lfs_ssize; 189 190 /* 191 * The number of free blocks is set from the total data size (lfs_dsize) 192 * minus one block for each segment (for the segment summary). Then 193 * we'll subtract off the room for the superblocks, ifile entries and 194 * segment usage table. 195 */ 196 lfsp->lfs_bfree = lfsp->lfs_dsize - lfsp->lfs_nseg; 197 lfsp->lfs_segtabsz = SEGTABSIZE_SU(lfsp); 198 lfsp->lfs_cleansz = CLEANSIZE_SU(lfsp); 199 if ((lfsp->lfs_tstamp = time(NULL)) == -1) 200 fatal("time: %s", strerror(errno)); 201 if ((sb_interval = lfsp->lfs_nseg / LFS_MAXNUMSB) < LFS_MIN_SBINTERVAL) 202 sb_interval = LFS_MIN_SBINTERVAL; 203 204 /* 205 * Now, lay out the file system. We need to figure out where 206 * the superblocks go, initialize the checkpoint information 207 * for the first two superblocks, initialize the segment usage 208 * information, put the segusage information in the ifile, create 209 * the first block of IFILE structures, and link all the IFILE 210 * structures into a free list. 211 */ 212 213 /* Figure out where the superblocks are going to live */ 214 lfsp->lfs_sboffs[0] = LFS_LABELPAD/lp->d_secsize; 215 for (i = 1; i < LFS_MAXNUMSB; i++) { 216 sb_addr = ((i * sb_interval) << 217 (lfsp->lfs_segshift - lfsp->lfs_bshift + lfsp->lfs_fsbtodb)) 218 + lfsp->lfs_sboffs[0]; 219 if (sb_addr > partp->p_size) 220 break; 221 lfsp->lfs_sboffs[i] = sb_addr; 222 } 223 last_sb_addr = lfsp->lfs_sboffs[i - 1]; 224 lfsp->lfs_lastseg = lfsp->lfs_sboffs[0]; 225 lfsp->lfs_nextseg = 226 lfsp->lfs_sboffs[1] ? lfsp->lfs_sboffs[1] : lfsp->lfs_sboffs[0]; 227 lfsp->lfs_curseg = lfsp->lfs_lastseg; 228 229 /* 230 * Initialize the segment usage table. The first segment will 231 * contain the superblock, the cleanerinfo (cleansz), the segusage 232 * table * (segtabsz), 1 block's worth of IFILE entries, the root 233 * directory, the lost+found directory and one block's worth of 234 * inodes (containing the ifile, root, and l+f inodes). 235 */ 236 if (!(cleaninfo = malloc(lfsp->lfs_cleansz << lfsp->lfs_bshift))) 237 fatal("%s", strerror(errno)); 238 cleaninfo->clean = lfsp->lfs_nseg - 1; 239 cleaninfo->dirty = 1; 240 241 if (!(segtable = malloc(lfsp->lfs_segtabsz << lfsp->lfs_bshift))) 242 fatal("%s", strerror(errno)); 243 segp = segtable; 244 blocks_used = lfsp->lfs_segtabsz + lfsp->lfs_cleansz + 4; 245 segp->su_nbytes = blocks_used << lfsp->lfs_bshift; 246 segp->su_lastmod = lfsp->lfs_tstamp; 247 segp->su_flags = SEGUSE_SUPERBLOCK | SEGUSE_DIRTY; 248 lfsp->lfs_bfree -= lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 4; 249 250 /* 251 * Now figure out the address of the ifile inode. The inode block 252 * appears immediately after the segment summary. 253 */ 254 lfsp->lfs_idaddr = (LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE) / 255 lp->d_secsize; 256 257 for (segp = segtable + 1, i = 1; i < lfsp->lfs_nseg; i++, segp++) { 258 if ((i % sb_interval) == 0) { 259 segp->su_flags = SEGUSE_SUPERBLOCK; 260 lfsp->lfs_bfree -= (LFS_SBPAD >> lfsp->lfs_bshift); 261 } else 262 segp->su_flags = 0; 263 segp->su_lastmod = 0; 264 segp->su_nbytes = 0; 265 } 266 267 /* 268 * Ready to start writing segments. The first segment is different 269 * because it contains the segment usage table and the ifile inode 270 * as well as a superblock. For the rest of the segments, set the 271 * time stamp to be 0 so that the first segment is the most recent. 272 * For each segment that is supposed to contain a copy of the super 273 * block, initialize its first few blocks and its segment summary 274 * to indicate this. 275 */ 276 lfsp->lfs_nfiles = LFS_FIRST_INUM - 1; 277 lfsp->lfs_cksum = 278 cksum(lfsp, sizeof(struct lfs) - sizeof(lfsp->lfs_cksum)); 279 280 /* Now create a block of disk inodes */ 281 if (!(dpagep = malloc(lfsp->lfs_bsize))) 282 fatal("%s", strerror(errno)); 283 dip = (struct dinode *)dpagep; 284 bzero(dip, lfsp->lfs_bsize); 285 286 /* Create a block of IFILE structures. */ 287 if (!(ipagep = malloc(lfsp->lfs_bsize))) 288 fatal("%s", strerror(errno)); 289 ifile = (IFILE *)ipagep; 290 291 /* 292 * Initialize IFILE. It is the next block following the 293 * block of inodes (whose address has been calculated in 294 * lfsp->lfs_idaddr; 295 */ 296 sb_addr = lfsp->lfs_idaddr + lfsp->lfs_bsize / lp->d_secsize; 297 sb_addr = make_dinode(LFS_IFILE_INUM, dip, 298 lfsp->lfs_cleansz + lfsp->lfs_segtabsz+1, sb_addr, lfsp); 299 dip->di_mode = IFREG|IREAD|IWRITE; 300 ip = &ifile[LFS_IFILE_INUM]; 301 ip->if_version = 1; 302 ip->if_daddr = lfsp->lfs_idaddr; 303 304 /* Initialize the ROOT Directory */ 305 sb_addr = make_dinode(ROOTINO, ++dip, 1, sb_addr, lfsp); 306 dip->di_mode = IFDIR|IREAD|IWRITE|IEXEC; 307 dip->di_size = DIRBLKSIZ; 308 dip->di_nlink = 3; 309 ip = &ifile[ROOTINO]; 310 ip->if_version = 1; 311 ip->if_daddr = lfsp->lfs_idaddr; 312 313 /* Initialize the lost+found Directory */ 314 sb_addr = make_dinode(LOSTFOUNDINO, ++dip, 1, sb_addr, lfsp); 315 dip->di_mode = IFDIR|IREAD|IWRITE|IEXEC; 316 dip->di_size = DIRBLKSIZ; 317 dip->di_nlink = 2; 318 ip = &ifile[LOSTFOUNDINO]; 319 ip->if_version = 1; 320 ip->if_daddr = lfsp->lfs_idaddr; 321 322 /* Make all the other dinodes invalid */ 323 for (i = INOPB(lfsp)-3, dip++; i; i--, dip++) 324 dip->di_inum = LFS_UNUSED_INUM; 325 326 327 /* Link remaining IFILE entries in free list */ 328 for (ip = &ifile[LFS_FIRST_INUM], i = LFS_FIRST_INUM; 329 i < lfsp->lfs_ifpb; ++ip) { 330 ip->if_version = 1; 331 ip->if_daddr = LFS_UNUSED_DADDR; 332 ip->if_nextfree = ++i; 333 } 334 ifile[lfsp->lfs_ifpb - 1].if_nextfree = LFS_UNUSED_INUM; 335 336 /* Now, write the segment */ 337 338 /* Compute a checksum across all the data you're writing */ 339 dp = datasump = malloc (blocks_used * sizeof(u_long)); 340 *dp++ = ((u_long *)dip)[0]; /* inode block */ 341 for (i = 0; i < lfsp->lfs_cleansz; i++) 342 *dp++ = ((u_long *)cleaninfo)[(i << lfsp->lfs_bshift) / 343 sizeof(u_long)]; /* Cleaner info */ 344 for (i = 0; i < lfsp->lfs_segtabsz; i++) 345 *dp++ = ((u_long *)segtable)[(i << lfsp->lfs_bshift) / 346 sizeof(u_long)]; /* Segusage table */ 347 *dp++ = ((u_long *)ifile)[0]; /* Ifile */ 348 349 /* Still need the root and l+f bytes; get them later */ 350 351 /* Write out the inode block */ 352 off = LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE; 353 put(fd, off, dpagep, lfsp->lfs_bsize); 354 free(dpagep); 355 off += lfsp->lfs_bsize; 356 357 /* Write out the ifile */ 358 359 put(fd, off, cleaninfo, lfsp->lfs_cleansz << lfsp->lfs_bshift); 360 off += (lfsp->lfs_cleansz << lfsp->lfs_bshift); 361 (void)free(cleaninfo); 362 363 put(fd, off, segtable, lfsp->lfs_segtabsz << lfsp->lfs_bshift); 364 off += (lfsp->lfs_segtabsz << lfsp->lfs_bshift); 365 (void)free(segtable); 366 367 put(fd, off, ifile, lfsp->lfs_bsize); 368 off += lfsp->lfs_bsize; 369 370 /* 371 * use ipagep for space for writing out other stuff. It used to 372 * contain the ifile, but we're done with it. 373 */ 374 375 /* Write out the root and lost and found directories */ 376 bzero(ipagep, lfsp->lfs_bsize); 377 make_dir(ipagep, lfs_root_dir, 378 sizeof(lfs_root_dir) / sizeof(struct direct)); 379 *dp++ = ((u_long *)ipagep)[0]; 380 put(fd, off, ipagep, lfsp->lfs_bsize); 381 off += lfsp->lfs_bsize; 382 383 bzero(ipagep, lfsp->lfs_bsize); 384 make_dir(ipagep, lfs_lf_dir, 385 sizeof(lfs_lf_dir) / sizeof(struct direct)); 386 *dp++ = ((u_long *)ipagep)[0]; 387 put(fd, off, ipagep, lfsp->lfs_bsize); 388 389 /* Write Supberblock */ 390 lfsp->lfs_offset = (off + lfsp->lfs_bsize) / lp->d_secsize; 391 put(fd, LFS_LABELPAD, lfsp, sizeof(struct lfs)); 392 393 /* 394 * Finally, calculate all the fields for the summary structure 395 * and write it. 396 */ 397 398 summary.ss_next = lfsp->lfs_nextseg; 399 summary.ss_create = lfsp->lfs_tstamp; 400 summary.ss_nfinfo = 3; 401 summary.ss_ninos = 3; 402 summary.ss_datasum = cksum(datasump, sizeof(u_long) * blocks_used); 403 404 /* 405 * Make sure that we don't overflow a summary block. We have to 406 * record: FINFO structures for ifile, root, and l+f. The number 407 * of blocks recorded for the ifile is determined by the size of 408 * the cleaner info and the segments usage table. There is room 409 * for one block included in sizeof(FINFO) so we don't need to add 410 * any extra space for the ROOT and L+F, and one block of the ifile 411 * is already counted. Finally, we leave room for 1 inode block 412 * address. 413 */ 414 sum_size = 3*sizeof(FINFO) + sizeof(SEGSUM) + sizeof(daddr_t) + 415 (lfsp->lfs_cleansz + lfsp->lfs_segtabsz) * sizeof(u_long); 416 #define SUMERR \ 417 "Multiple summary blocks in segment 1 not yet implemented\nsummary is %d bytes." 418 if (sum_size > LFS_SUMMARY_SIZE) 419 fatal(SUMERR, sum_size); 420 421 block_array_size = lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 1; 422 423 if (!(block_array = malloc(block_array_size *sizeof(int)))) 424 fatal("%s: %s", special, strerror(errno)); 425 426 /* fill in the array */ 427 for (i = 0; i < block_array_size; i++) 428 block_array[i] = i; 429 430 /* copy into segment */ 431 sump = ipagep; 432 bcopy(&summary, sump, sizeof(SEGSUM)); 433 sump += sizeof(SEGSUM); 434 435 /* Now, add the ifile */ 436 file_info.fi_nblocks = block_array_size; 437 file_info.fi_version = 1; 438 file_info.fi_ino = LFS_IFILE_INUM; 439 440 bcopy(&file_info, sump, sizeof(FINFO) - sizeof(u_long)); 441 sump += sizeof(FINFO) - sizeof(u_long); 442 bcopy(block_array, sump, sizeof(u_long) * file_info.fi_nblocks); 443 sump += sizeof(u_long) * file_info.fi_nblocks; 444 445 /* Now, add the root directory */ 446 file_info.fi_nblocks = 1; 447 file_info.fi_version = 1; 448 file_info.fi_ino = ROOTINO; 449 file_info.fi_blocks[0] = 0; 450 bcopy(&file_info, sump, sizeof(FINFO)); 451 sump += sizeof(FINFO); 452 453 /* Now, add the lost and found */ 454 file_info.fi_ino = LOSTFOUNDINO; 455 bcopy(&file_info, sump, sizeof(FINFO)); 456 457 ((daddr_t *)ipagep)[LFS_SUMMARY_SIZE / sizeof(daddr_t) - 1] = 458 lfsp->lfs_idaddr; 459 ((SEGSUM *)ipagep)->ss_sumsum = cksum(ipagep+sizeof(summary.ss_sumsum), 460 LFS_SUMMARY_SIZE - sizeof(summary.ss_sumsum)); 461 put(fd, LFS_LABELPAD + LFS_SBPAD, ipagep, LFS_SUMMARY_SIZE); 462 463 sp = (SEGSUM *)ipagep; 464 sp->ss_create = 0; 465 sp->ss_nfinfo = 0; 466 sp->ss_ninos = 0; 467 sp->ss_datasum = 0; 468 469 /* Now, write rest of segments containing superblocks */ 470 lfsp->lfs_tstamp = 0; 471 lfsp->lfs_cksum = 472 cksum(lfsp, sizeof(struct lfs) - sizeof(lfsp->lfs_cksum)); 473 for (seg_addr = last_addr = lfsp->lfs_sboffs[0], j = 1, i = 1; 474 i < lfsp->lfs_nseg; i++) { 475 476 seg_addr += lfsp->lfs_ssize << lfsp->lfs_fsbtodb; 477 sp->ss_next = last_addr; 478 last_addr = seg_addr; 479 seg_seek = seg_addr * lp->d_secsize; 480 481 if (seg_addr == lfsp->lfs_sboffs[j]) { 482 if (j < (LFS_MAXNUMSB - 2)) 483 j++; 484 put(fd, seg_seek, lfsp, sizeof(struct lfs)); 485 seg_seek += LFS_SBPAD; 486 } 487 488 /* Summary */ 489 sp->ss_sumsum = cksum(&sp->ss_datasum, 490 LFS_SUMMARY_SIZE - sizeof(sp->ss_sumsum)); 491 put(fd, seg_seek, sp, LFS_SUMMARY_SIZE); 492 } 493 free(ipagep); 494 close(fd); 495 return (0); 496 } 497 498 static void 499 put(fd, off, p, len) 500 int fd; 501 off_t off; 502 void *p; 503 size_t len; 504 { 505 int wbytes; 506 507 if (lseek(fd, off, SEEK_SET) < 0) 508 fatal("%s: %s", special, strerror(errno)); 509 if ((wbytes = write(fd, p, len)) < 0) 510 fatal("%s: %s", special, strerror(errno)); 511 if (wbytes != len) 512 fatal("%s: short write (%d, not %d)", special, wbytes, len); 513 } 514 515 /* 516 * Create the root directory for this file system and the lost+found 517 * directory. 518 */ 519 520 u_long d_ino; /* inode number of entry */ 521 u_short d_reclen; /* length of this record */ 522 u_short d_namlen; /* length of string in d_name */ 523 char d_name[MAXNAMLEN + 1]; /* name with length <= MAXNAMLEN */ 524 lfsinit() 525 { 526 } 527 528 static daddr_t 529 make_dinode(ino, dip, nblocks, saddr, lfsp) 530 ino_t ino; /* inode we're creating */ 531 struct dinode *dip; /* disk inode */ 532 int nblocks; /* number of blocks in file */ 533 daddr_t saddr; /* starting block address */ 534 struct lfs *lfsp; /* superblock */ 535 { 536 int db_per_fb, i; 537 538 dip->di_nlink = 1; 539 dip->di_blocks = nblocks; 540 541 /* If we ever need something longer than 32 bits, this changes */ 542 dip->di_size = (dip->di_blocks << lfsp->lfs_bshift); 543 dip->di_atime = dip->di_mtime = dip->di_ctime = lfsp->lfs_tstamp; 544 dip->di_inum = ino; 545 546 #define SEGERR \ 547 "File requires more than the number of direct blocks; increase block or segment size." 548 if (NDADDR < nblocks) 549 fatal("%s", SEGERR); 550 551 /* Assign the block addresses for the ifile */ 552 db_per_fb = 1 << lfsp->lfs_fsbtodb; 553 for (i = 0; i < dip->di_blocks; i++, saddr += db_per_fb) 554 dip->di_db[i] = saddr; 555 556 return (saddr); 557 } 558 559 560 /* 561 * Construct a set of directory entries in "bufp". We assume that all the 562 * entries in protodir fir in the first DIRBLKSIZ. 563 */ 564 static void 565 make_dir(bufp, protodir, entries) 566 void *bufp; 567 register struct direct *protodir; 568 int entries; 569 { 570 char *cp; 571 int i, spcleft; 572 573 spcleft = DIRBLKSIZ; 574 for (cp = bufp, i = 0; i < entries - 1; i++) { 575 protodir[i].d_reclen = DIRSIZ(&protodir[i]); 576 bcopy(&protodir[i], cp, protodir[i].d_reclen); 577 cp += protodir[i].d_reclen; 578 if ((spcleft -= protodir[i].d_reclen) < 0) 579 fatal("%s: %s", special, "directory too big"); 580 } 581 protodir[i].d_reclen = spcleft; 582 bcopy(&protodir[i], cp, DIRSIZ(&protodir[i])); 583 } 584