예제 #1
0
파일: cgroup.c 프로젝트: hmatyschok/MeshBSD
int
cgbfree(struct uufsd *disk, ufs2_daddr_t bno, long size)
{
	u_int8_t *blksfree;
	struct fs *fs;
	struct cg *cgp;
	ufs1_daddr_t fragno, cgbno;
	int i, cg, blk, frags, bbase;

	fs = &disk->d_fs;
	cg = dtog(fs, bno);
	if (cgread1(disk, cg) != 1)
		return (-1);
	cgp = &disk->d_cg;
	cgbno = dtogd(fs, bno);
	blksfree = cg_blksfree(cgp);
	if (size == fs->fs_bsize) {
		fragno = fragstoblks(fs, cgbno);
		ffs_setblock(fs, blksfree, fragno);
		ffs_clusteracct(fs, cgp, fragno, 1);
		cgp->cg_cs.cs_nbfree++;
		fs->fs_cstotal.cs_nbfree++;
		fs->fs_cs(fs, cg).cs_nbfree++;
	} else {
		bbase = cgbno - fragnum(fs, cgbno);
		/*
		 * decrement the counts associated with the old frags
		 */
		blk = blkmap(fs, blksfree, bbase);
		ffs_fragacct(fs, blk, cgp->cg_frsum, -1);
		/*
		 * deallocate the fragment
		 */
		frags = numfrags(fs, size);
		for (i = 0; i < frags; i++)
			setbit(blksfree, cgbno + i);
		cgp->cg_cs.cs_nffree += i;
		fs->fs_cstotal.cs_nffree += i;
		fs->fs_cs(fs, cg).cs_nffree += i;
		/*
		 * add back in counts associated with the new frags
		 */
		blk = blkmap(fs, blksfree, bbase);
		ffs_fragacct(fs, blk, cgp->cg_frsum, 1);
		/*
		 * if a complete block has been reassembled, account for it
		 */
		fragno = fragstoblks(fs, bbase);
		if (ffs_isblock(fs, blksfree, fragno)) {
			cgp->cg_cs.cs_nffree -= fs->fs_frag;
			fs->fs_cstotal.cs_nffree -= fs->fs_frag;
			fs->fs_cs(fs, cg).cs_nffree -= fs->fs_frag;
			ffs_clusteracct(fs, cgp, fragno, 1);
			cgp->cg_cs.cs_nbfree++;
			fs->fs_cstotal.cs_nbfree++;
			fs->fs_cs(fs, cg).cs_nbfree++;
		}
	}
	return cgwrite(disk);
}
예제 #2
0
/*
 * Check that a block in a legal block number.
 * Return 0 if in range, 1 if out of range.
 */
int
chkrange(ufs_daddr_t blk, int cnt)
{
	int c;

	if (cnt <= 0 || blk <= 0 || blk > maxfsblock ||
	    cnt - 1 > maxfsblock - blk)
		return (1);
	if (cnt > sblock.fs_frag ||
	    fragnum(&sblock, blk) + cnt > sblock.fs_frag) {
		if (debug)
			printf("bad size: blk %ld, offset %d, size %d\n",
				(long)blk, fragnum(&sblock, blk), cnt);
		return (1);
	}
	c = dtog(&sblock, blk);
	if (blk < cgdmin(&sblock, c)) {
		if ((blk + cnt) > cgsblock(&sblock, c)) {
			if (debug) {
				printf("blk %ld < cgdmin %ld;",
				    (long)blk, (long)cgdmin(&sblock, c));
				printf(" blk + cnt %ld > cgsbase %ld\n",
				    (long)(blk + cnt),
				    (long)cgsblock(&sblock, c));
			}
			return (1);
		}
	} else {
		if ((blk + cnt) > cgbase(&sblock, c+1)) {
			if (debug)  {
				printf("blk %ld >= cgdmin %ld;",
				    (long)blk, (long)cgdmin(&sblock, c));
				printf(" blk + cnt %ld > sblock.fs_fpg %ld\n",
				    (long)(blk + cnt), (long)sblock.fs_fpg);
			}
			return (1);
		}
	}
	return (0);
}
예제 #3
0
파일: mkfs.c 프로젝트: lwhsu/freebsd-makefs
struct fs *
ffs_mkfs(const char *fsys, const fsinfo_t *fsopts, time_t tstamp)
{
	int fragsperinode, optimalfpg, origdensity, minfpg, lastminfpg;
	int32_t cylno, i, csfrags;
	long long sizepb;
	void *space;
	int size, blks;
	int nprintcols, printcolwidth;
	ffs_opt_t	*ffs_opts = fsopts->fs_specific;

	Oflag =		ffs_opts->version;
	fssize =        fsopts->size / fsopts->sectorsize;
	sectorsize =    fsopts->sectorsize;
	fsize =         ffs_opts->fsize;
	bsize =         ffs_opts->bsize;
	maxbsize =      ffs_opts->maxbsize;
	maxblkspercg =  ffs_opts->maxblkspercg;
	minfree =       ffs_opts->minfree;
	opt =           ffs_opts->optimization;
	density =       ffs_opts->density;
	maxcontig =     ffs_opts->maxcontig;
	maxbpg =        ffs_opts->maxbpg;
	avgfilesize =   ffs_opts->avgfilesize;
	avgfpdir =      ffs_opts->avgfpdir;
	bbsize =        BBSIZE;
	sbsize =        SBLOCKSIZE;

	strlcpy(sblock.fs_volname, ffs_opts->label, sizeof(sblock.fs_volname));

	if (Oflag == 0) {
		sblock.fs_old_inodefmt = FS_42INODEFMT;
		sblock.fs_maxsymlinklen = 0;
		sblock.fs_old_flags = 0;
	} else {
		sblock.fs_old_inodefmt = FS_44INODEFMT;
		sblock.fs_maxsymlinklen = (Oflag == 1 ? MAXSYMLINKLEN_UFS1 :
		    MAXSYMLINKLEN_UFS2);
		sblock.fs_old_flags = FS_FLAGS_UPDATED;
		sblock.fs_flags = 0;
	}
	/*
	 * Validate the given file system size.
	 * Verify that its last block can actually be accessed.
	 * Convert to file system fragment sized units.
	 */
	if (fssize <= 0) {
		printf("preposterous size %lld\n", (long long)fssize);
		exit(13);
	}
	ffs_wtfs(fssize - 1, sectorsize, (char *)&sblock, fsopts);

	/*
	 * collect and verify the filesystem density info
	 */
	sblock.fs_avgfilesize = avgfilesize;
	sblock.fs_avgfpdir = avgfpdir;
	if (sblock.fs_avgfilesize <= 0)
		printf("illegal expected average file size %d\n",
		    sblock.fs_avgfilesize), exit(14);
	if (sblock.fs_avgfpdir <= 0)
		printf("illegal expected number of files per directory %d\n",
		    sblock.fs_avgfpdir), exit(15);
	/*
	 * collect and verify the block and fragment sizes
	 */
	sblock.fs_bsize = bsize;
	sblock.fs_fsize = fsize;
	if (!POWEROF2(sblock.fs_bsize)) {
		printf("block size must be a power of 2, not %d\n",
		    sblock.fs_bsize);
		exit(16);
	}
	if (!POWEROF2(sblock.fs_fsize)) {
		printf("fragment size must be a power of 2, not %d\n",
		    sblock.fs_fsize);
		exit(17);
	}
	if (sblock.fs_fsize < sectorsize) {
		printf("fragment size %d is too small, minimum is %d\n",
		    sblock.fs_fsize, sectorsize);
		exit(18);
	}
	if (sblock.fs_bsize < MINBSIZE) {
		printf("block size %d is too small, minimum is %d\n",
		    sblock.fs_bsize, MINBSIZE);
		exit(19);
	}
	if (sblock.fs_bsize > FFS_MAXBSIZE) {
		printf("block size %d is too large, maximum is %d\n",
		    sblock.fs_bsize, FFS_MAXBSIZE);
		exit(19);
	}
	if (sblock.fs_bsize < sblock.fs_fsize) {
		printf("block size (%d) cannot be smaller than fragment size (%d)\n",
		    sblock.fs_bsize, sblock.fs_fsize);
		exit(20);
	}

	if (maxbsize < bsize || !POWEROF2(maxbsize)) {
		sblock.fs_maxbsize = sblock.fs_bsize;
		printf("Extent size set to %d\n", sblock.fs_maxbsize);
	} else if (sblock.fs_maxbsize > FS_MAXCONTIG * sblock.fs_bsize) {
		sblock.fs_maxbsize = FS_MAXCONTIG * sblock.fs_bsize;
		printf("Extent size reduced to %d\n", sblock.fs_maxbsize);
	} else {
		sblock.fs_maxbsize = maxbsize;
	}
	sblock.fs_maxcontig = maxcontig;
	if (sblock.fs_maxcontig < sblock.fs_maxbsize / sblock.fs_bsize) {
		sblock.fs_maxcontig = sblock.fs_maxbsize / sblock.fs_bsize;
		printf("Maxcontig raised to %d\n", sblock.fs_maxbsize);
	}

	if (sblock.fs_maxcontig > 1)
		sblock.fs_contigsumsize = MIN(sblock.fs_maxcontig,FS_MAXCONTIG);

	sblock.fs_bmask = ~(sblock.fs_bsize - 1);
	sblock.fs_fmask = ~(sblock.fs_fsize - 1);
	sblock.fs_qbmask = ~sblock.fs_bmask;
	sblock.fs_qfmask = ~sblock.fs_fmask;
	for (sblock.fs_bshift = 0, i = sblock.fs_bsize; i > 1; i >>= 1)
		sblock.fs_bshift++;
	for (sblock.fs_fshift = 0, i = sblock.fs_fsize; i > 1; i >>= 1)
		sblock.fs_fshift++;
	sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize);
	for (sblock.fs_fragshift = 0, i = sblock.fs_frag; i > 1; i >>= 1)
		sblock.fs_fragshift++;
	if (sblock.fs_frag > MAXFRAG) {
		printf("fragment size %d is too small, "
			"minimum with block size %d is %d\n",
		    sblock.fs_fsize, sblock.fs_bsize,
		    sblock.fs_bsize / MAXFRAG);
		exit(21);
	}
	sblock.fs_fsbtodb = ilog2(sblock.fs_fsize / sectorsize);
	sblock.fs_size = sblock.fs_providersize = fssize =
	    dbtofsb(&sblock, fssize);

	if (Oflag <= 1) {
		sblock.fs_magic = FS_UFS1_MAGIC;
		sblock.fs_sblockloc = SBLOCK_UFS1;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs1_daddr_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
		sblock.fs_maxsymlinklen = ((NDADDR + NIADDR) *
		    sizeof (ufs1_daddr_t));
		sblock.fs_old_inodefmt = FS_44INODEFMT;
		sblock.fs_old_cgoffset = 0;
		sblock.fs_old_cgmask = 0xffffffff;
		sblock.fs_old_size = sblock.fs_size;
		sblock.fs_old_rotdelay = 0;
		sblock.fs_old_rps = 60;
		sblock.fs_old_nspf = sblock.fs_fsize / sectorsize;
		sblock.fs_old_cpg = 1;
		sblock.fs_old_interleave = 1;
		sblock.fs_old_trackskew = 0;
		sblock.fs_old_cpc = 0;
		sblock.fs_old_postblformat = 1;
		sblock.fs_old_nrpos = 1;
	} else {
		sblock.fs_magic = FS_UFS2_MAGIC;
		sblock.fs_sblockloc = SBLOCK_UFS2;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs2_daddr_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
		sblock.fs_maxsymlinklen = ((NDADDR + NIADDR) *
		    sizeof (ufs2_daddr_t));
	}

	sblock.fs_sblkno =
	    roundup(howmany(sblock.fs_sblockloc + SBLOCKSIZE, sblock.fs_fsize),
		sblock.fs_frag);
	sblock.fs_cblkno = (daddr_t)(sblock.fs_sblkno +
	    roundup(howmany(SBLOCKSIZE, sblock.fs_fsize), sblock.fs_frag));
	sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag;
	sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
	for (sizepb = sblock.fs_bsize, i = 0; i < NIADDR; i++) {
		sizepb *= NINDIR(&sblock);
		sblock.fs_maxfilesize += sizepb;
	}

	/*
	 * Calculate the number of blocks to put into each cylinder group.
	 *
	 * This algorithm selects the number of blocks per cylinder
	 * group. The first goal is to have at least enough data blocks
	 * in each cylinder group to meet the density requirement. Once
	 * this goal is achieved we try to expand to have at least
	 * 1 cylinder group. Once this goal is achieved, we pack as
	 * many blocks into each cylinder group map as will fit.
	 *
	 * We start by calculating the smallest number of blocks that we
	 * can put into each cylinder group. If this is too big, we reduce
	 * the density until it fits.
	 */
	origdensity = density;
	for (;;) {
		fragsperinode = MAX(numfrags(&sblock, density), 1);
		minfpg = fragsperinode * INOPB(&sblock);
		if (minfpg > sblock.fs_size)
			minfpg = sblock.fs_size;
		sblock.fs_ipg = INOPB(&sblock);
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
			break;
		density -= sblock.fs_fsize;
	}
	if (density != origdensity)
		printf("density reduced from %d to %d\n", origdensity, density);

	if (maxblkspercg <= 0 || maxblkspercg >= fssize)
		maxblkspercg = fssize - 1;
	/*
	 * Start packing more blocks into the cylinder group until
	 * it cannot grow any larger, the number of cylinder groups
	 * drops below 1, or we reach the size requested.
	 */
	for ( ; sblock.fs_fpg < maxblkspercg; sblock.fs_fpg += sblock.fs_frag) {
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		if (sblock.fs_size / sblock.fs_fpg < 1)
			break;
		if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
			continue;
		if (CGSIZE(&sblock) == (unsigned long)sblock.fs_bsize)
			break;
		sblock.fs_fpg -= sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		break;
	}
	/*
	 * Check to be sure that the last cylinder group has enough blocks
	 * to be viable. If it is too small, reduce the number of blocks
	 * per cylinder group which will have the effect of moving more
	 * blocks into the last cylinder group.
	 */
	optimalfpg = sblock.fs_fpg;
	for (;;) {
		sblock.fs_ncg = howmany(sblock.fs_size, sblock.fs_fpg);
		lastminfpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_size < lastminfpg) {
			printf("Filesystem size %lld < minimum size of %d\n",
			    (long long)sblock.fs_size, lastminfpg);
			exit(28);
		}
		if (sblock.fs_size % sblock.fs_fpg >= lastminfpg ||
		    sblock.fs_size % sblock.fs_fpg == 0)
			break;
		sblock.fs_fpg -= sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
	}
	if (optimalfpg != sblock.fs_fpg)
		printf("Reduced frags per cylinder group from %d to %d %s\n",
		   optimalfpg, sblock.fs_fpg, "to enlarge last cyl group");
	sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
	sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock);
	if (Oflag <= 1) {
		sblock.fs_old_spc = sblock.fs_fpg * sblock.fs_old_nspf;
		sblock.fs_old_nsect = sblock.fs_old_spc;
		sblock.fs_old_npsect = sblock.fs_old_spc;
		sblock.fs_old_ncyl = sblock.fs_ncg;
	}

	/*
	 * fill in remaining fields of the super block
	 */
	sblock.fs_csaddr = cgdmin(&sblock, 0);
	sblock.fs_cssize =
	    fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));

	/*
	 * Setup memory for temporary in-core cylgroup summaries.
	 * Cribbed from ffs_mountfs().
	 */
	size = sblock.fs_cssize;
	blks = howmany(size, sblock.fs_fsize);
	if (sblock.fs_contigsumsize > 0)
		size += sblock.fs_ncg * sizeof(int32_t);
	if ((space = (char *)calloc(1, size)) == NULL)
		err(1, "memory allocation error for cg summaries");
	sblock.fs_csp = space;
	space = (char *)space + sblock.fs_cssize;
	if (sblock.fs_contigsumsize > 0) {
		int32_t *lp;

		sblock.fs_maxcluster = lp = space;
		for (i = 0; i < sblock.fs_ncg; i++)
		*lp++ = sblock.fs_contigsumsize;
	}

	sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs));
	if (sblock.fs_sbsize > SBLOCKSIZE)
		sblock.fs_sbsize = SBLOCKSIZE;
	sblock.fs_minfree = minfree;
	sblock.fs_maxcontig = maxcontig;
	sblock.fs_maxbpg = maxbpg;
	sblock.fs_optim = opt;
	sblock.fs_cgrotor = 0;
	sblock.fs_pendingblocks = 0;
	sblock.fs_pendinginodes = 0;
	sblock.fs_cstotal.cs_ndir = 0;
	sblock.fs_cstotal.cs_nbfree = 0;
	sblock.fs_cstotal.cs_nifree = 0;
	sblock.fs_cstotal.cs_nffree = 0;
	sblock.fs_fmod = 0;
	sblock.fs_ronly = 0;
	sblock.fs_state = 0;
	sblock.fs_clean = FS_ISCLEAN;
	sblock.fs_ronly = 0;
	sblock.fs_id[0] = tstamp;
	sblock.fs_id[1] = random();
	sblock.fs_fsmnt[0] = '\0';
	csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize);
	sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno -
	    sblock.fs_ncg * (sblock.fs_dblkno - sblock.fs_sblkno);
	sblock.fs_cstotal.cs_nbfree =
	    fragstoblks(&sblock, sblock.fs_dsize) -
	    howmany(csfrags, sblock.fs_frag);
	sblock.fs_cstotal.cs_nffree =
	    fragnum(&sblock, sblock.fs_size) +
	    (fragnum(&sblock, csfrags) > 0 ?
	    sblock.fs_frag - fragnum(&sblock, csfrags) : 0);
	sblock.fs_cstotal.cs_nifree = sblock.fs_ncg * sblock.fs_ipg - ROOTINO;
	sblock.fs_cstotal.cs_ndir = 0;
	sblock.fs_dsize -= csfrags;
	sblock.fs_time = tstamp;
	if (Oflag <= 1) {
		sblock.fs_old_time = tstamp;
		sblock.fs_old_dsize = sblock.fs_dsize;
		sblock.fs_old_csaddr = sblock.fs_csaddr;
		sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	}
	/*
	 * Dump out summary information about file system.
	 */
#define	B2MBFACTOR (1 / (1024.0 * 1024.0))
	printf("%s: %.1fMB (%lld sectors) block size %d, "
	       "fragment size %d\n",
	    fsys, (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
	    (long long)fsbtodb(&sblock, sblock.fs_size),
	    sblock.fs_bsize, sblock.fs_fsize);
	printf("\tusing %d cylinder groups of %.2fMB, %d blks, "
	       "%d inodes.\n",
	    sblock.fs_ncg,
	    (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
	    sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg);
#undef B2MBFACTOR
	/*
	 * Now determine how wide each column will be, and calculate how
	 * many columns will fit in a 76 char line. 76 is the width of the
	 * subwindows in sysinst.
	 */
	printcolwidth = count_digits(
			fsbtodb(&sblock, cgsblock(&sblock, sblock.fs_ncg -1)));
	nprintcols = 76 / (printcolwidth + 2);

	/*
	 * allocate space for superblock, cylinder group map, and
	 * two sets of inode blocks.
	 */
	if (sblock.fs_bsize < SBLOCKSIZE)
		iobufsize = SBLOCKSIZE + 3 * sblock.fs_bsize;
	else
		iobufsize = 4 * sblock.fs_bsize;
	if ((iobuf = malloc(iobufsize)) == NULL) {
		printf("Cannot allocate I/O buffer\n");
		exit(38);
	}
	memset(iobuf, 0, iobufsize);
	/*
	 * Make a copy of the superblock into the buffer that we will be
	 * writing out in each cylinder group.
	 */
	memcpy(writebuf, &sblock, sbsize);
	if (fsopts->needswap)
		ffs_sb_swap(&sblock, (struct fs*)writebuf);
	memcpy(iobuf, writebuf, SBLOCKSIZE);

	printf("super-block backups (for fsck -b #) at:");
	for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
		initcg(cylno, tstamp, fsopts);
		if (cylno % nprintcols == 0)
			printf("\n");
		printf(" %*lld,", printcolwidth,
			(long long)fsbtodb(&sblock, cgsblock(&sblock, cylno)));
		fflush(stdout);
	}
	printf("\n");

	/*
	 * Now construct the initial file system,
	 * then write out the super-block.
	 */
	sblock.fs_time = tstamp;
	if (Oflag <= 1) {
		sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	}
	if (fsopts->needswap)
		sblock.fs_flags |= FS_SWAPPED;
	ffs_write_superblock(&sblock, fsopts);
	return (&sblock);
}
예제 #4
0
void
mkfs(struct partition *pp, char *fsys)
{
	int fragsperinode, optimalfpg, origdensity, minfpg, lastminfpg;
	long i, j, csfrags;
	uint cg;
	time_t utime;
	quad_t sizepb;
	int width;
	ino_t maxinum;
	int minfragsperinode;	/* minimum ratio of frags to inodes */
	char tmpbuf[100];	/* XXX this will break in about 2,500 years */
	union {
		struct fs fdummy;
		char cdummy[SBLOCKSIZE];
	} dummy;
#define fsdummy dummy.fdummy
#define chdummy dummy.cdummy

	/*
	 * Our blocks == sector size, and the version of UFS we are using is
	 * specified by Oflag.
	 */
	disk.d_bsize = sectorsize;
	disk.d_ufs = Oflag;
	if (Rflag) {
		utime = 1000000000;
	} else {
		time(&utime);
		arc4random_stir();
	}
	sblock.fs_old_flags = FS_FLAGS_UPDATED;
	sblock.fs_flags = 0;
	if (Uflag)
		sblock.fs_flags |= FS_DOSOFTDEP;
	if (Lflag)
		strlcpy(sblock.fs_volname, volumelabel, MAXVOLLEN);
	if (Jflag)
		sblock.fs_flags |= FS_GJOURNAL;
	if (lflag)
		sblock.fs_flags |= FS_MULTILABEL;
	if (tflag)
		sblock.fs_flags |= FS_TRIM;
	/*
	 * Validate the given file system size.
	 * Verify that its last block can actually be accessed.
	 * Convert to file system fragment sized units.
	 */
	if (fssize <= 0) {
		printf("preposterous size %jd\n", (intmax_t)fssize);
		exit(13);
	}
	wtfs(fssize - (realsectorsize / DEV_BSIZE), realsectorsize,
	    (char *)&sblock);
	/*
	 * collect and verify the file system density info
	 */
	sblock.fs_avgfilesize = avgfilesize;
	sblock.fs_avgfpdir = avgfilesperdir;
	if (sblock.fs_avgfilesize <= 0)
		printf("illegal expected average file size %d\n",
		    sblock.fs_avgfilesize), exit(14);
	if (sblock.fs_avgfpdir <= 0)
		printf("illegal expected number of files per directory %d\n",
		    sblock.fs_avgfpdir), exit(15);

restart:
	/*
	 * collect and verify the block and fragment sizes
	 */
	sblock.fs_bsize = bsize;
	sblock.fs_fsize = fsize;
	if (!POWEROF2(sblock.fs_bsize)) {
		printf("block size must be a power of 2, not %d\n",
		    sblock.fs_bsize);
		exit(16);
	}
	if (!POWEROF2(sblock.fs_fsize)) {
		printf("fragment size must be a power of 2, not %d\n",
		    sblock.fs_fsize);
		exit(17);
	}
	if (sblock.fs_fsize < sectorsize) {
		printf("increasing fragment size from %d to sector size (%d)\n",
		    sblock.fs_fsize, sectorsize);
		sblock.fs_fsize = sectorsize;
	}
	if (sblock.fs_bsize > MAXBSIZE) {
		printf("decreasing block size from %d to maximum (%d)\n",
		    sblock.fs_bsize, MAXBSIZE);
		sblock.fs_bsize = MAXBSIZE;
	}
	if (sblock.fs_bsize < MINBSIZE) {
		printf("increasing block size from %d to minimum (%d)\n",
		    sblock.fs_bsize, MINBSIZE);
		sblock.fs_bsize = MINBSIZE;
	}
	if (sblock.fs_fsize > MAXBSIZE) {
		printf("decreasing fragment size from %d to maximum (%d)\n",
		    sblock.fs_fsize, MAXBSIZE);
		sblock.fs_fsize = MAXBSIZE;
	}
	if (sblock.fs_bsize < sblock.fs_fsize) {
		printf("increasing block size from %d to fragment size (%d)\n",
		    sblock.fs_bsize, sblock.fs_fsize);
		sblock.fs_bsize = sblock.fs_fsize;
	}
	if (sblock.fs_fsize * MAXFRAG < sblock.fs_bsize) {
		printf(
		"increasing fragment size from %d to block size / %d (%d)\n",
		    sblock.fs_fsize, MAXFRAG, sblock.fs_bsize / MAXFRAG);
		sblock.fs_fsize = sblock.fs_bsize / MAXFRAG;
	}
	if (maxbsize == 0)
		maxbsize = bsize;
	if (maxbsize < bsize || !POWEROF2(maxbsize)) {
		sblock.fs_maxbsize = sblock.fs_bsize;
		printf("Extent size set to %d\n", sblock.fs_maxbsize);
	} else if (sblock.fs_maxbsize > FS_MAXCONTIG * sblock.fs_bsize) {
		sblock.fs_maxbsize = FS_MAXCONTIG * sblock.fs_bsize;
		printf("Extent size reduced to %d\n", sblock.fs_maxbsize);
	} else {
		sblock.fs_maxbsize = maxbsize;
	}
	/*
	 * Maxcontig sets the default for the maximum number of blocks
	 * that may be allocated sequentially. With file system clustering
	 * it is possible to allocate contiguous blocks up to the maximum
	 * transfer size permitted by the controller or buffering.
	 */
	if (maxcontig == 0)
		maxcontig = MAX(1, MAXPHYS / bsize);
	sblock.fs_maxcontig = maxcontig;
	if (sblock.fs_maxcontig < sblock.fs_maxbsize / sblock.fs_bsize) {
		sblock.fs_maxcontig = sblock.fs_maxbsize / sblock.fs_bsize;
		printf("Maxcontig raised to %d\n", sblock.fs_maxbsize);
	}
	if (sblock.fs_maxcontig > 1)
		sblock.fs_contigsumsize = MIN(sblock.fs_maxcontig,FS_MAXCONTIG);
	sblock.fs_bmask = ~(sblock.fs_bsize - 1);
	sblock.fs_fmask = ~(sblock.fs_fsize - 1);
	sblock.fs_qbmask = ~sblock.fs_bmask;
	sblock.fs_qfmask = ~sblock.fs_fmask;
	sblock.fs_bshift = ilog2(sblock.fs_bsize);
	sblock.fs_fshift = ilog2(sblock.fs_fsize);
	sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize);
	sblock.fs_fragshift = ilog2(sblock.fs_frag);
	if (sblock.fs_frag > MAXFRAG) {
		printf("fragment size %d is still too small (can't happen)\n",
		    sblock.fs_bsize / MAXFRAG);
		exit(21);
	}
	sblock.fs_fsbtodb = ilog2(sblock.fs_fsize / sectorsize);
	sblock.fs_size = fssize = dbtofsb(&sblock, fssize);
	sblock.fs_providersize = dbtofsb(&sblock, mediasize / sectorsize);

	/*
	 * Before the filesystem is finally initialized, mark it
	 * as incompletely initialized.
	 */
	sblock.fs_magic = FS_BAD_MAGIC;

	if (Oflag == 1) {
		sblock.fs_sblockloc = SBLOCK_UFS1;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs1_daddr_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
		sblock.fs_maxsymlinklen = ((NDADDR + NIADDR) *
		    sizeof(ufs1_daddr_t));
		sblock.fs_old_inodefmt = FS_44INODEFMT;
		sblock.fs_old_cgoffset = 0;
		sblock.fs_old_cgmask = 0xffffffff;
		sblock.fs_old_size = sblock.fs_size;
		sblock.fs_old_rotdelay = 0;
		sblock.fs_old_rps = 60;
		sblock.fs_old_nspf = sblock.fs_fsize / sectorsize;
		sblock.fs_old_cpg = 1;
		sblock.fs_old_interleave = 1;
		sblock.fs_old_trackskew = 0;
		sblock.fs_old_cpc = 0;
		sblock.fs_old_postblformat = 1;
		sblock.fs_old_nrpos = 1;
	} else {
		sblock.fs_sblockloc = SBLOCK_UFS2;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs2_daddr_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
		sblock.fs_maxsymlinklen = ((NDADDR + NIADDR) *
		    sizeof(ufs2_daddr_t));
	}
	sblock.fs_sblkno =
	    roundup(howmany(sblock.fs_sblockloc + SBLOCKSIZE, sblock.fs_fsize),
		sblock.fs_frag);
	sblock.fs_cblkno = sblock.fs_sblkno +
	    roundup(howmany(SBLOCKSIZE, sblock.fs_fsize), sblock.fs_frag);
	sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag;
	sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
	for (sizepb = sblock.fs_bsize, i = 0; i < NIADDR; i++) {
		sizepb *= NINDIR(&sblock);
		sblock.fs_maxfilesize += sizepb;
	}

	/*
	 * It's impossible to create a snapshot in case that fs_maxfilesize
	 * is smaller than the fssize.
	 */
	if (sblock.fs_maxfilesize < (u_quad_t)fssize) {
		warnx("WARNING: You will be unable to create snapshots on this "
		      "file system.  Correct by using a larger blocksize.");
	}

	/*
	 * Calculate the number of blocks to put into each cylinder group.
	 *
	 * This algorithm selects the number of blocks per cylinder
	 * group. The first goal is to have at least enough data blocks
	 * in each cylinder group to meet the density requirement. Once
	 * this goal is achieved we try to expand to have at least
	 * MINCYLGRPS cylinder groups. Once this goal is achieved, we
	 * pack as many blocks into each cylinder group map as will fit.
	 *
	 * We start by calculating the smallest number of blocks that we
	 * can put into each cylinder group. If this is too big, we reduce
	 * the density until it fits.
	 */
	maxinum = (((int64_t)(1)) << 32) - INOPB(&sblock);
	minfragsperinode = 1 + fssize / maxinum;
	if (density == 0) {
		density = MAX(NFPI, minfragsperinode) * fsize;
	} else if (density < minfragsperinode * fsize) {
		origdensity = density;
		density = minfragsperinode * fsize;
		fprintf(stderr, "density increased from %d to %d\n",
		    origdensity, density);
	}
	origdensity = density;
	for (;;) {
		fragsperinode = MAX(numfrags(&sblock, density), 1);
		if (fragsperinode < minfragsperinode) {
			bsize <<= 1;
			fsize <<= 1;
			printf("Block size too small for a file system %s %d\n",
			     "of this size. Increasing blocksize to", bsize);
			goto restart;
		}
		minfpg = fragsperinode * INOPB(&sblock);
		if (minfpg > sblock.fs_size)
			minfpg = sblock.fs_size;
		sblock.fs_ipg = INOPB(&sblock);
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
			break;
		density -= sblock.fs_fsize;
	}
	if (density != origdensity)
		printf("density reduced from %d to %d\n", origdensity, density);
	/*
	 * Start packing more blocks into the cylinder group until
	 * it cannot grow any larger, the number of cylinder groups
	 * drops below MINCYLGRPS, or we reach the size requested.
	 * For UFS1 inodes per cylinder group are stored in an int16_t
	 * so fs_ipg is limited to 2^15 - 1.
	 */
	for ( ; sblock.fs_fpg < maxblkspercg; sblock.fs_fpg += sblock.fs_frag) {
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		if (Oflag > 1 || (Oflag == 1 && sblock.fs_ipg <= 0x7fff)) {
			if (sblock.fs_size / sblock.fs_fpg < MINCYLGRPS)
				break;
			if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
				continue;
			if (CGSIZE(&sblock) == (unsigned long)sblock.fs_bsize)
				break;
		}
		sblock.fs_fpg -= sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		break;
	}
	/*
	 * Check to be sure that the last cylinder group has enough blocks
	 * to be viable. If it is too small, reduce the number of blocks
	 * per cylinder group which will have the effect of moving more
	 * blocks into the last cylinder group.
	 */
	optimalfpg = sblock.fs_fpg;
	for (;;) {
		sblock.fs_ncg = howmany(sblock.fs_size, sblock.fs_fpg);
		lastminfpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_size < lastminfpg) {
			printf("Filesystem size %jd < minimum size of %d\n",
			    (intmax_t)sblock.fs_size, lastminfpg);
			exit(28);
		}
		if (sblock.fs_size % sblock.fs_fpg >= lastminfpg ||
		    sblock.fs_size % sblock.fs_fpg == 0)
			break;
		sblock.fs_fpg -= sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
	}
	if (optimalfpg != sblock.fs_fpg)
		printf("Reduced frags per cylinder group from %d to %d %s\n",
		   optimalfpg, sblock.fs_fpg, "to enlarge last cyl group");
	sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
	sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock);
	if (Oflag == 1) {
		sblock.fs_old_spc = sblock.fs_fpg * sblock.fs_old_nspf;
		sblock.fs_old_nsect = sblock.fs_old_spc;
		sblock.fs_old_npsect = sblock.fs_old_spc;
		sblock.fs_old_ncyl = sblock.fs_ncg;
	}
	/*
	 * fill in remaining fields of the super block
	 */
	sblock.fs_csaddr = cgdmin(&sblock, 0);
	sblock.fs_cssize =
	    fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));
	fscs = (struct csum *)calloc(1, sblock.fs_cssize);
	if (fscs == NULL)
		errx(31, "calloc failed");
	sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs));
	if (sblock.fs_sbsize > SBLOCKSIZE)
		sblock.fs_sbsize = SBLOCKSIZE;
	sblock.fs_minfree = minfree;
	if (metaspace > 0 && metaspace < sblock.fs_fpg / 2)
		sblock.fs_metaspace = blknum(&sblock, metaspace);
	else if (metaspace != -1)
		/* reserve half of minfree for metadata blocks */
		sblock.fs_metaspace = blknum(&sblock,
		    (sblock.fs_fpg * minfree) / 200);
	if (maxbpg == 0)
		sblock.fs_maxbpg = MAXBLKPG(sblock.fs_bsize);
	else
		sblock.fs_maxbpg = maxbpg;
	sblock.fs_optim = opt;
	sblock.fs_cgrotor = 0;
	sblock.fs_pendingblocks = 0;
	sblock.fs_pendinginodes = 0;
	sblock.fs_fmod = 0;
	sblock.fs_ronly = 0;
	sblock.fs_state = 0;
	sblock.fs_clean = 1;
	sblock.fs_id[0] = (long)utime;
	sblock.fs_id[1] = newfs_random();
	sblock.fs_fsmnt[0] = '\0';
	csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize);
	sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno -
	    sblock.fs_ncg * (sblock.fs_dblkno - sblock.fs_sblkno);
	sblock.fs_cstotal.cs_nbfree =
	    fragstoblks(&sblock, sblock.fs_dsize) -
	    howmany(csfrags, sblock.fs_frag);
	sblock.fs_cstotal.cs_nffree =
	    fragnum(&sblock, sblock.fs_size) +
	    (fragnum(&sblock, csfrags) > 0 ?
	     sblock.fs_frag - fragnum(&sblock, csfrags) : 0);
	sblock.fs_cstotal.cs_nifree = sblock.fs_ncg * sblock.fs_ipg - ROOTINO;
	sblock.fs_cstotal.cs_ndir = 0;
	sblock.fs_dsize -= csfrags;
	sblock.fs_time = utime;
	if (Oflag == 1) {
		sblock.fs_old_time = utime;
		sblock.fs_old_dsize = sblock.fs_dsize;
		sblock.fs_old_csaddr = sblock.fs_csaddr;
		sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	}

	/*
	 * Dump out summary information about file system.
	 */
#	define B2MBFACTOR (1 / (1024.0 * 1024.0))
	printf("%s: %.1fMB (%jd sectors) block size %d, fragment size %d\n",
	    fsys, (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
	    (intmax_t)fsbtodb(&sblock, sblock.fs_size), sblock.fs_bsize,
	    sblock.fs_fsize);
	printf("\tusing %d cylinder groups of %.2fMB, %d blks, %d inodes.\n",
	    sblock.fs_ncg, (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
	    sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg);
	if (sblock.fs_flags & FS_DOSOFTDEP)
		printf("\twith soft updates\n");
#	undef B2MBFACTOR

	if (Eflag && !Nflag) {
		printf("Erasing sectors [%jd...%jd]\n", 
		    sblock.fs_sblockloc / disk.d_bsize,
		    fsbtodb(&sblock, sblock.fs_size) - 1);
		berase(&disk, sblock.fs_sblockloc / disk.d_bsize,
		    sblock.fs_size * sblock.fs_fsize - sblock.fs_sblockloc);
	}
	/*
	 * Wipe out old UFS1 superblock(s) if necessary.
	 */
	if (!Nflag && Oflag != 1) {
		i = bread(&disk, part_ofs + SBLOCK_UFS1 / disk.d_bsize, chdummy, SBLOCKSIZE);
		if (i == -1)
			err(1, "can't read old UFS1 superblock: %s", disk.d_error);

		if (fsdummy.fs_magic == FS_UFS1_MAGIC) {
			fsdummy.fs_magic = 0;
			bwrite(&disk, part_ofs + SBLOCK_UFS1 / disk.d_bsize,
			    chdummy, SBLOCKSIZE);
			for (cg = 0; cg < fsdummy.fs_ncg; cg++) {
				if (fsbtodb(&fsdummy, cgsblock(&fsdummy, cg)) > fssize)
					break;
				bwrite(&disk, part_ofs + fsbtodb(&fsdummy,
				  cgsblock(&fsdummy, cg)), chdummy, SBLOCKSIZE);
			}
		}
	}
	if (!Nflag)
		do_sbwrite(&disk);
	if (Xflag == 1) {
		printf("** Exiting on Xflag 1\n");
		exit(0);
	}
	if (Xflag == 2)
		printf("** Leaving BAD MAGIC on Xflag 2\n");
	else
		sblock.fs_magic = (Oflag != 1) ? FS_UFS2_MAGIC : FS_UFS1_MAGIC;

	/*
	 * Now build the cylinders group blocks and
	 * then print out indices of cylinder groups.
	 */
	printf("super-block backups (for fsck -b #) at:\n");
	i = 0;
	width = charsperline();
	/*
	 * allocate space for superblock, cylinder group map, and
	 * two sets of inode blocks.
	 */
	if (sblock.fs_bsize < SBLOCKSIZE)
		iobufsize = SBLOCKSIZE + 3 * sblock.fs_bsize;
	else
		iobufsize = 4 * sblock.fs_bsize;
	if ((iobuf = calloc(1, iobufsize)) == 0) {
		printf("Cannot allocate I/O buffer\n");
		exit(38);
	}
	/*
	 * Make a copy of the superblock into the buffer that we will be
	 * writing out in each cylinder group.
	 */
	bcopy((char *)&sblock, iobuf, SBLOCKSIZE);
	for (cg = 0; cg < sblock.fs_ncg; cg++) {
		initcg(cg, utime);
		j = snprintf(tmpbuf, sizeof(tmpbuf), " %jd%s",
		    (intmax_t)fsbtodb(&sblock, cgsblock(&sblock, cg)),
		    cg < (sblock.fs_ncg-1) ? "," : "");
		if (j < 0)
			tmpbuf[j = 0] = '\0';
		if (i + j >= width) {
			printf("\n");
			i = 0;
		}
		i += j;
		printf("%s", tmpbuf);
		fflush(stdout);
	}
	printf("\n");
	if (Nflag)
		exit(0);
	/*
	 * Now construct the initial file system,
	 * then write out the super-block.
	 */
	fsinit(utime);
	if (Oflag == 1) {
		sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	}
	if (Xflag == 3) {
		printf("** Exiting on Xflag 3\n");
		exit(0);
	}
	if (!Nflag) {
		do_sbwrite(&disk);
		/*
		 * For UFS1 filesystems with a blocksize of 64K, the first
		 * alternate superblock resides at the location used for
		 * the default UFS2 superblock. As there is a valid
		 * superblock at this location, the boot code will use
		 * it as its first choice. Thus we have to ensure that
		 * all of its statistcs on usage are correct.
		 */
		if (Oflag == 1 && sblock.fs_bsize == 65536)
			wtfs(fsbtodb(&sblock, cgsblock(&sblock, 0)),
			    sblock.fs_bsize, (char *)&sblock);
	}
	for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize)
		wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)),
			sblock.fs_cssize - i < sblock.fs_bsize ?
			sblock.fs_cssize - i : sblock.fs_bsize,
			((char *)fscs) + i);
	/*
	 * Update information about this partition in pack
	 * label, to that it may be updated on disk.
	 */
	if (pp != NULL) {
		pp->p_fstype = FS_BSDFFS;
		pp->p_fsize = sblock.fs_fsize;
		pp->p_frag = sblock.fs_frag;
		pp->p_cpg = sblock.fs_fpg;
	}
}
예제 #5
0
void
mkfs(struct partition *pp, char *fsys, int fi, int fo, mode_t mfsmode,
    uid_t mfsuid, gid_t mfsgid)
{
	time_t utime;
	quad_t sizepb;
	int i, j, width, origdensity, fragsperinode, minfpg, optimalfpg;
	int lastminfpg, mincylgrps;
	long cylno, csfrags;
	char tmpbuf[100];	/* XXX this will break in about 2,500 years */

	if ((fsun = calloc(1, sizeof (union fs_u))) == NULL ||
	    (cgun = calloc(1, sizeof (union cg_u))) == NULL)
		err(1, "calloc");

#ifndef STANDALONE
	time(&utime);
#endif
	if (mfs) {
		quad_t sz = (quad_t)fssize * sectorsize;
		if (sz > SIZE_T_MAX) {
			errno = ENOMEM;
			err(12, "mmap");
		}
		membase = mmap(NULL, sz, PROT_READ|PROT_WRITE,
		    MAP_ANON|MAP_PRIVATE, -1, (off_t)0);
		if (membase == MAP_FAILED)
			err(12, "mmap");
		madvise(membase, sz, MADV_RANDOM);
	}
	fsi = fi;
	fso = fo;
	/*
	 * Validate the given file system size.
	 * Verify that its last block can actually be accessed.
	 */
	if (Oflag <= 1 && fssize > INT_MAX)
		errx(13, "preposterous size %lld, max is %d", fssize, INT_MAX);
	if (Oflag == 2 && fssize > MAXDISKSIZE)
		errx(13, "preposterous size %lld, max is %lld", fssize,
		    MAXDISKSIZE);

	wtfs(fssize - 1, sectorsize, (char *)&sblock);

	sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
	sblock.fs_avgfilesize = avgfilesize;
	sblock.fs_avgfpdir = avgfilesperdir;

	/*
	 * Collect and verify the block and fragment sizes.
	 */
	if (!POWEROF2(bsize)) {
		errx(16, "block size must be a power of 2, not %d", bsize);
	}
	if (!POWEROF2(fsize)) {
		errx(17, "fragment size must be a power of 2, not %d",
		     fsize);
	}
	if (fsize < sectorsize) {
		errx(18, "fragment size %d is too small, minimum is %d",
		     fsize, sectorsize);
	}
	if (bsize < MINBSIZE) {
		errx(19, "block size %d is too small, minimum is %d",
		     bsize, MINBSIZE);
	}
	if (bsize > MAXBSIZE) {
		errx(19, "block size %d is too large, maximum is %d",
		     bsize, MAXBSIZE);
	}
	if (bsize < fsize) {
		errx(20, "block size (%d) cannot be smaller than fragment size (%d)",
		     bsize, fsize);
	}
	sblock.fs_bsize = bsize;
	sblock.fs_fsize = fsize;

	/*
	 * Calculate the superblock bitmasks and shifts.
	 */
	sblock.fs_bmask = ~(sblock.fs_bsize - 1);
	sblock.fs_fmask = ~(sblock.fs_fsize - 1);
	sblock.fs_qbmask = ~sblock.fs_bmask;
	sblock.fs_qfmask = ~sblock.fs_fmask;
	sblock.fs_bshift = ilog2(sblock.fs_bsize);
	sblock.fs_fshift = ilog2(sblock.fs_fsize);
	sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize);
	if (sblock.fs_frag > MAXFRAG) {
		errx(21, "fragment size %d is too small, minimum with block "
		    "size %d is %d", sblock.fs_fsize, sblock.fs_bsize,
		    sblock.fs_bsize / MAXFRAG);
	}
	sblock.fs_fragshift = ilog2(sblock.fs_frag);
	sblock.fs_fsbtodb = ilog2(sblock.fs_fsize / sectorsize);
	sblock.fs_size = dbtofsb(&sblock, fssize);
	sblock.fs_nspf = sblock.fs_fsize / sectorsize;
	sblock.fs_maxcontig = 1;
	sblock.fs_nrpos = 1;
	sblock.fs_cpg = 1;

	/*
	 * Before the file system is fully initialized, mark it as invalid.
	 */
	sblock.fs_magic = FS_BAD_MAGIC;

	/*
	 * Set the remaining superblock fields.  Note that for FFS1, media
	 * geometry fields are set to fake values.  This is for compatibility
	 * with really ancient kernels that might still inspect these values.
	 */
	if (Oflag <= 1) {
		sblock.fs_sblockloc = SBLOCK_UFS1;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(int32_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
		if (Oflag == 0) {
			sblock.fs_maxsymlinklen = 0;
			sblock.fs_inodefmt = FS_42INODEFMT;
		} else {
			sblock.fs_maxsymlinklen = MAXSYMLINKLEN_UFS1;
			sblock.fs_inodefmt = FS_44INODEFMT;
		}
		sblock.fs_cgoffset = 0;
		sblock.fs_cgmask = 0xffffffff;
		sblock.fs_ffs1_size = sblock.fs_size;
		sblock.fs_rotdelay = 0;
		sblock.fs_rps = 60;
		sblock.fs_interleave = 1;
		sblock.fs_trackskew = 0;
		sblock.fs_cpc = 0;
	} else {
		sblock.fs_inodefmt = FS_44INODEFMT;
		sblock.fs_sblockloc = SBLOCK_UFS2;
		sblock.fs_nindir = sblock.fs_bsize / sizeof(int64_t);
		sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
		sblock.fs_maxsymlinklen = MAXSYMLINKLEN_UFS2;
	}
	sblock.fs_sblkno =
	    roundup(howmany(sblock.fs_sblockloc + SBLOCKSIZE, sblock.fs_fsize),
		sblock.fs_frag);
	sblock.fs_cblkno = (int32_t)(sblock.fs_sblkno +
	    roundup(howmany(SBSIZE, sblock.fs_fsize), sblock.fs_frag));
	sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag;
	sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
	for (sizepb = sblock.fs_bsize, i = 0; i < NIADDR; i++) {
		sizepb *= NINDIR(&sblock);
		sblock.fs_maxfilesize += sizepb;
	}
#ifdef notyet
	/*
	 * It is impossible to create a snapshot in case fs_maxfilesize is
	 * smaller than fssize.
	 */
	if (sblock.fs_maxfilesize < (u_quad_t)fssize)
		warnx("WARNING: You will be unable to create snapshots on this "
		    "file system. Correct by using a larger blocksize.");
#endif
	/*
	 * Calculate the number of blocks to put into each cylinder group. The
	 * first goal is to have at least enough data blocks in each cylinder
	 * group to meet the density requirement. Once this goal is achieved
	 * we try to expand to have at least mincylgrps cylinder groups. Once
	 * this goal is achieved, we pack as many blocks into each cylinder
	 * group map as will fit.
	 *
	 * We start by calculating the smallest number of blocks that we can
	 * put into each cylinder group. If this is too big, we reduce the
	 * density until it fits.
	 */
	origdensity = density;
	for (;;) {
		fragsperinode = MAX(numfrags(&sblock, density), 1);

		minfpg = fragsperinode * INOPB(&sblock);
		if (minfpg > sblock.fs_size)
			minfpg = sblock.fs_size;

		sblock.fs_ipg = INOPB(&sblock);
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;

		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
		sblock.fs_fpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_fpg < minfpg)
			sblock.fs_fpg = minfpg;

		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));

		if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize)
			break;

		density -= sblock.fs_fsize;
	}
	if (density != origdensity)
		warnx("density reduced from %d to %d bytes per inode",
		    origdensity, density);

	/*
	 * Use a lower value for mincylgrps if the user specified a large
	 * number of blocks per cylinder group.  This is needed for, e.g. the
	 * install media which needs to pack 2 files very tightly.
	 */
	mincylgrps = MINCYLGRPS;
	if (maxfrgspercg != INT_MAX) {
		i = sblock.fs_size / maxfrgspercg;
		if (i < MINCYLGRPS)
			mincylgrps = i <= 0 ? 1 : i;
	}

	/*
	 * Start packing more blocks into the cylinder group until it cannot
	 * grow any larger, the number of cylinder groups drops below
	 * mincylgrps, or we reach the requested size.
	 */
	for (;;) {
		sblock.fs_fpg += sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));

		if (sblock.fs_fpg > maxfrgspercg ||
		    sblock.fs_size / sblock.fs_fpg < mincylgrps ||
		    CGSIZE(&sblock) > (unsigned long)sblock.fs_bsize)
			break;
	}
	sblock.fs_fpg -= sblock.fs_frag;
	sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
	    INOPB(&sblock));
	if (sblock.fs_fpg > maxfrgspercg)
		warnx("can't honour -c: minimum is %d", sblock.fs_fpg);

	/*
	 * Check to be sure that the last cylinder group has enough blocks to
	 * be viable. If it is too small, reduce the number of blocks per
	 * cylinder group which will have the effect of moving more blocks into
	 * the last cylinder group.
	 */
	optimalfpg = sblock.fs_fpg;
	for (;;) {
		sblock.fs_ncg = howmany(sblock.fs_size, sblock.fs_fpg);
		lastminfpg = roundup(sblock.fs_iblkno +
		    sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag);
		if (sblock.fs_size < lastminfpg)
			errx(28, "file system size %jd < minimum size of %d",
			    (intmax_t)sblock.fs_size, lastminfpg);

		if (sblock.fs_size % sblock.fs_fpg >= lastminfpg ||
		    sblock.fs_size % sblock.fs_fpg == 0)
			break;

		sblock.fs_fpg -= sblock.fs_frag;
		sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode),
		    INOPB(&sblock));
	}

	if (optimalfpg != sblock.fs_fpg)
		warnx("reduced number of fragments per cylinder group from %d"
		    " to %d to enlarge last cylinder group", optimalfpg,
		    sblock.fs_fpg);

	/*
	 * Back to filling superblock fields.
	 */
	if (Oflag <= 1) {
		sblock.fs_spc = sblock.fs_fpg * sblock.fs_nspf;
		sblock.fs_nsect = sblock.fs_spc;
		sblock.fs_npsect = sblock.fs_spc;
		sblock.fs_ncyl = sblock.fs_ncg;
	}
	sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
	sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock);
	sblock.fs_csaddr = cgdmin(&sblock, 0);
	sblock.fs_cssize =
	    fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));

	fscs = (struct csum *)calloc(1, sblock.fs_cssize);
	if (fscs == NULL)
		errx(31, "calloc failed");

	sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs));
	if (sblock.fs_sbsize > SBLOCKSIZE)
		sblock.fs_sbsize = SBLOCKSIZE;

	sblock.fs_minfree = minfree;
	sblock.fs_maxbpg = maxbpg;
	sblock.fs_optim = opt;
	sblock.fs_cgrotor = 0;
	sblock.fs_pendingblocks = 0;
	sblock.fs_pendinginodes = 0;
	sblock.fs_fmod = 0;
	sblock.fs_ronly = 0;
	sblock.fs_state = 0;
	sblock.fs_clean = 1;
	sblock.fs_id[0] = (u_int32_t)utime;
	sblock.fs_id[1] = (u_int32_t)arc4random();
	sblock.fs_fsmnt[0] = '\0';

	csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize);
	sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno -
	    sblock.fs_ncg * (sblock.fs_dblkno - sblock.fs_sblkno);

	sblock.fs_cstotal.cs_nbfree = fragstoblks(&sblock, sblock.fs_dsize) -
	    howmany(csfrags, sblock.fs_frag);
	sblock.fs_cstotal.cs_nffree = fragnum(&sblock, sblock.fs_size) +
	    (fragnum(&sblock, csfrags) > 0 ?
	    sblock.fs_frag - fragnum(&sblock, csfrags) : 0);
	sblock.fs_cstotal.cs_nifree = sblock.fs_ncg * sblock.fs_ipg - ROOTINO;
	sblock.fs_cstotal.cs_ndir = 0;

	sblock.fs_dsize -= csfrags;
	sblock.fs_time = utime;

	if (Oflag <= 1) {
		sblock.fs_ffs1_time = sblock.fs_time;
		sblock.fs_ffs1_dsize = sblock.fs_dsize;
		sblock.fs_ffs1_csaddr = sblock.fs_csaddr;
		sblock.fs_ffs1_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_ffs1_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_ffs1_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_ffs1_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	}

	/*
	 * Dump out summary information about file system.
	 */
	if (!mfs) {
#define B2MBFACTOR (1 / (1024.0 * 1024.0))
		printf("%s: %.1fMB in %jd sectors of %d bytes\n", fsys,
		    (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
		    (intmax_t)fsbtodb(&sblock, sblock.fs_size), sectorsize);
		printf("%d cylinder groups of %.2fMB, %d blocks, %d"
		    " inodes each\n", sblock.fs_ncg,
		    (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
		    sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg);
#undef B2MBFACTOR
	}

	/*
	 * Wipe out old FFS1 superblock if necessary.
	 */
	if (Oflag >= 2) {
		union fs_u *fsun1;
		struct fs *fs1;

		fsun1 = calloc(1, sizeof(union fs_u));
		if (fsun1 == NULL)
			err(39, "calloc");
		fs1 = &fsun1->fs;
		rdfs(SBLOCK_UFS1 / sectorsize, SBSIZE, (char *)fs1);
		if (fs1->fs_magic == FS_UFS1_MAGIC) {
			fs1->fs_magic = FS_BAD_MAGIC;
			wtfs(SBLOCK_UFS1 / sectorsize, SBSIZE, (char *)fs1);
		}
		free(fsun1);
	}

	wtfs((int)sblock.fs_sblockloc / sectorsize, SBSIZE, (char *)&sblock);
	sblock.fs_magic = (Oflag <= 1) ? FS_UFS1_MAGIC : FS_UFS2_MAGIC;

	/*
	 * Now build the cylinders group blocks and
	 * then print out indices of cylinder groups.
	 */
	if (!quiet)
		printf("super-block backups (for fsck -b #) at:\n");
#ifndef STANDALONE
	else if (!mfs && isatty(STDIN_FILENO)) {
		signal(SIGINFO, siginfo);
		cur_fsys = fsys;
	}
#endif
	i = 0;
	width = charsperline();
	/*
	* Allocate space for superblock, cylinder group map, and two sets of
	* inode blocks.
	*/
	if (sblock.fs_bsize < SBLOCKSIZE)
		iobufsize = SBLOCKSIZE + 3 * sblock.fs_bsize;
	else
		iobufsize = 4 * sblock.fs_bsize;
	if ((iobuf = malloc(iobufsize)) == 0)
		errx(38, "cannot allocate I/O buffer");
	bzero(iobuf, iobufsize);
	/*
	 * Make a copy of the superblock into the buffer that we will be
	 * writing out in each cylinder group.
	 */
	bcopy((char *)&sblock, iobuf, SBLOCKSIZE);
	for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
		cur_cylno = (sig_atomic_t)cylno;
		initcg(cylno, utime);
		if (quiet)
			continue;
		j = snprintf(tmpbuf, sizeof tmpbuf, " %lld,",
		    fsbtodb(&sblock, cgsblock(&sblock, cylno)));
		if (j >= sizeof tmpbuf)
			j = sizeof tmpbuf - 1;
		if (j == -1 || i+j >= width) {
			printf("\n");
			i = 0;
		}
		i += j;
		printf("%s", tmpbuf);
		fflush(stdout);
	}
	if (!quiet)
		printf("\n");
	if (Nflag && !mfs)
		exit(0);
	/*
	 * Now construct the initial file system, then write out the superblock.
	 */
	if (Oflag <= 1) {
		if (fsinit1(utime, mfsmode, mfsuid, mfsgid))
			errx(32, "fsinit1 failed");
		sblock.fs_ffs1_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
		sblock.fs_ffs1_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
		sblock.fs_ffs1_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
		sblock.fs_ffs1_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
	} else {
		if (fsinit2(utime))
			errx(32, "fsinit2 failed");
	}

	wtfs((int)sblock.fs_sblockloc / sectorsize, SBSIZE, (char *)&sblock);

	for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize)
		wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)),
		    sblock.fs_cssize - i < sblock.fs_bsize ?
		    sblock.fs_cssize - i : sblock.fs_bsize,
		    ((char *)fscs) + i);

	/*
	 * Update information about this partion in pack label, to that it may
	 * be updated on disk.
	 */
	pp->p_fstype = FS_BSDFFS;
	pp->p_fragblock =
	    DISKLABELV1_FFS_FRAGBLOCK(sblock.fs_fsize, sblock.fs_frag);
	pp->p_cpg = sblock.fs_cpg;
}
예제 #6
0
/*
 * Free a block or fragment.
 *
 * The specified block or fragment is placed back in the
 * free map. If a fragment is deallocated, a possible 
 * block reassembly is checked.
 */
void
ffs_blkfree(struct inode *ip, daddr_t bno, long size)
{
	struct cg *cgp;
	struct buf *bp;
	int32_t fragno, cgbno;
	int i, error, cg, blk, frags, bbase;
	struct fs *fs = ip->i_fs;
	const int needswap = UFS_FSNEEDSWAP(fs);

	if (size > fs->fs_bsize || fragoff(fs, size) != 0 ||
	    fragnum(fs, bno) + numfrags(fs, size) > fs->fs_frag) {
		errx(1, "blkfree: bad size: bno %lld bsize %d size %ld",
		    (long long)bno, fs->fs_bsize, size);
	}
	cg = dtog(fs, bno);
	if (bno >= fs->fs_size) {
		warnx("bad block %lld, ino %ju", (long long)bno,
		    (uintmax_t)ip->i_number);
		return;
	}
	error = bread(ip->i_fd, ip->i_fs, fsbtodb(fs, cgtod(fs, cg)),
		(int)fs->fs_cgsize, &bp);
	if (error) {
		brelse(bp);
		return;
	}
	cgp = (struct cg *)bp->b_data;
	if (!cg_chkmagic_swap(cgp, needswap)) {
		brelse(bp);
		return;
	}
	cgbno = dtogd(fs, bno);
	if (size == fs->fs_bsize) {
		fragno = fragstoblks(fs, cgbno);
		if (!ffs_isfreeblock(fs, cg_blksfree_swap(cgp, needswap), fragno)) {
			errx(1, "blkfree: freeing free block %lld",
			    (long long)bno);
		}
		ffs_setblock(fs, cg_blksfree_swap(cgp, needswap), fragno);
		ffs_clusteracct(fs, cgp, fragno, 1);
		ufs_add32(cgp->cg_cs.cs_nbfree, 1, needswap);
		fs->fs_cstotal.cs_nbfree++;
		fs->fs_cs(fs, cg).cs_nbfree++;
	} else {
		bbase = cgbno - fragnum(fs, cgbno);
		/*
		 * decrement the counts associated with the old frags
		 */
		blk = blkmap(fs, cg_blksfree_swap(cgp, needswap), bbase);
		ffs_fragacct_swap(fs, blk, cgp->cg_frsum, -1, needswap);
		/*
		 * deallocate the fragment
		 */
		frags = numfrags(fs, size);
		for (i = 0; i < frags; i++) {
			if (isset(cg_blksfree_swap(cgp, needswap), cgbno + i)) {
				errx(1, "blkfree: freeing free frag: block %lld",
				    (long long)(cgbno + i));
			}
			setbit(cg_blksfree_swap(cgp, needswap), cgbno + i);
		}
		ufs_add32(cgp->cg_cs.cs_nffree, i, needswap);
		fs->fs_cstotal.cs_nffree += i;
		fs->fs_cs(fs, cg).cs_nffree += i;
		/*
		 * add back in counts associated with the new frags
		 */
		blk = blkmap(fs, cg_blksfree_swap(cgp, needswap), bbase);
		ffs_fragacct_swap(fs, blk, cgp->cg_frsum, 1, needswap);
		/*
		 * if a complete block has been reassembled, account for it
		 */
		fragno = fragstoblks(fs, bbase);
		if (ffs_isblock(fs, cg_blksfree_swap(cgp, needswap), fragno)) {
			ufs_add32(cgp->cg_cs.cs_nffree, -fs->fs_frag, needswap);
			fs->fs_cstotal.cs_nffree -= fs->fs_frag;
			fs->fs_cs(fs, cg).cs_nffree -= fs->fs_frag;
			ffs_clusteracct(fs, cgp, fragno, 1);
			ufs_add32(cgp->cg_cs.cs_nbfree, 1, needswap);
			fs->fs_cstotal.cs_nbfree++;
			fs->fs_cs(fs, cg).cs_nbfree++;
		}
	}
	fs->fs_fmod = 1;
	bdwrite(bp);
}