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freebsd-dev/sbin/newfs/mkfs.c
Kirk McKusick 41e20344a2 Add some more checks to newfs so that it will not build filesystems 
that the kernel will refuse to mount. Specifically it now enforces
the MAXBSIZE blocksize limit. This update also fixes a problem where
newfs could segment fault if the selected fragment size was too large.

PR:		bin/30959
Submitted by:	Ceri Davies <setantae@submonkey.net>
Sponsored by:   DARPA & NAI Labs.
2002-11-30 18:28:26 +00:00

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/*
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Marshall
* Kirk McKusick and Network Associates Laboratories, the Security
* Research Division of Network Associates, Inc. under DARPA/SPAWAR
* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
* research program
*
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* Copyright (c) 1980, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)mkfs.c 8.11 (Berkeley) 5/3/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <err.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "newfs.h"
/*
* make file system for cylinder-group style file systems
*/
#define UMASK 0755
#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
static union {
struct fs fs;
char pad[SBLOCKSIZE];
} fsun;
#define sblock fsun.fs
static struct csum *fscs;
static union {
struct cg cg;
char pad[MAXBSIZE];
} cgun;
#define acg cgun.cg
union dinode {
struct ufs1_dinode dp1;
struct ufs2_dinode dp2;
};
#define DIP(dp, field) \
((sblock.fs_magic == FS_UFS1_MAGIC) ? \
(dp)->dp1.field : (dp)->dp2.field)
static int randinit;
static caddr_t iobuf;
static long iobufsize;
static ufs2_daddr_t alloc(int size, int mode);
static int charsperline(void);
static void clrblock(struct fs *, unsigned char *, int);
static void fsinit(time_t);
static int ilog2(int);
static void initcg(int, time_t);
static int isblock(struct fs *, unsigned char *, int);
static void iput(union dinode *, ino_t);
static int makedir(struct direct *, int);
static void rdfs(ufs2_daddr_t, int, char *);
static void setblock(struct fs *, unsigned char *, int);
static void wtfs(ufs2_daddr_t, int, char *);
static void wtfsflush(void);
void
mkfs(struct partition *pp, char *fsys)
{
int fragsperinode, optimalfpg, origdensity, minfpg, lastminfpg;
long i, j, cylno, csfrags;
time_t utime;
quad_t sizepb;
int width;
char tmpbuf[100]; /* XXX this will break in about 2,500 years */
if (Rflag)
utime = 1000000000;
else
time(&utime);
if (!Rflag && !randinit) {
randinit = 1;
srandomdev();
}
sblock.fs_old_flags = FS_FLAGS_UPDATED;
sblock.fs_flags = 0;
if (Uflag)
sblock.fs_flags |= FS_DOSOFTDEP;
/*
* 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);
/*
* 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 < 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;
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);
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 = 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
* 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)
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 ( ; 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 < 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;
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] = 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) +
(numfrags(&sblock, csfrags) > 0 ?
sblock.fs_frag - numfrags(&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
/*
* 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 = malloc(iobufsize)) == 0) {
printf("Cannot allocate I/O buffer\n");
exit(38);
}
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++) {
initcg(cylno, utime);
j = snprintf(tmpbuf, sizeof(tmpbuf), " %jd%s",
(intmax_t)fsbtodb(&sblock, cgsblock(&sblock, cylno)),
cylno < (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;
}
wtfs(sblock.fs_sblockloc / sectorsize, SBLOCKSIZE, (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);
wtfsflush();
/*
* Update information about this partion 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;
}
}
/*
* Initialize a cylinder group.
*/
void
initcg(int cylno, time_t utime)
{
long i, j, d, dlower, dupper, blkno, start;
ufs2_daddr_t cbase, dmax;
struct ufs1_dinode *dp1;
struct ufs2_dinode *dp2;
struct csum *cs;
/*
* Determine block bounds for cylinder group.
* Allow space for super block summary information in first
* cylinder group.
*/
cbase = cgbase(&sblock, cylno);
dmax = cbase + sblock.fs_fpg;
if (dmax > sblock.fs_size)
dmax = sblock.fs_size;
dlower = cgsblock(&sblock, cylno) - cbase;
dupper = cgdmin(&sblock, cylno) - cbase;
if (cylno == 0)
dupper += howmany(sblock.fs_cssize, sblock.fs_fsize);
cs = &fscs[cylno];
memset(&acg, 0, sblock.fs_cgsize);
acg.cg_time = utime;
acg.cg_magic = CG_MAGIC;
acg.cg_cgx = cylno;
acg.cg_niblk = sblock.fs_ipg;
acg.cg_initediblk = sblock.fs_ipg < 2 * INOPB(&sblock) ?
sblock.fs_ipg : 2 * INOPB(&sblock);
acg.cg_ndblk = dmax - cbase;
if (sblock.fs_contigsumsize > 0)
acg.cg_nclusterblks = acg.cg_ndblk / sblock.fs_frag;
start = &acg.cg_space[0] - (u_char *)(&acg.cg_firstfield);
if (Oflag == 2) {
acg.cg_iusedoff = start;
} else {
acg.cg_old_ncyl = sblock.fs_old_cpg;
acg.cg_old_time = acg.cg_time;
acg.cg_time = 0;
acg.cg_old_niblk = acg.cg_niblk;
acg.cg_niblk = 0;
acg.cg_initediblk = 0;
acg.cg_old_btotoff = start;
acg.cg_old_boff = acg.cg_old_btotoff +
sblock.fs_old_cpg * sizeof(int32_t);
acg.cg_iusedoff = acg.cg_old_boff +
sblock.fs_old_cpg * sizeof(u_int16_t);
}
acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
acg.cg_nextfreeoff = acg.cg_freeoff + howmany(sblock.fs_fpg, CHAR_BIT);
if (sblock.fs_contigsumsize > 0) {
acg.cg_clustersumoff =
roundup(acg.cg_nextfreeoff, sizeof(u_int32_t));
acg.cg_clustersumoff -= sizeof(u_int32_t);
acg.cg_clusteroff = acg.cg_clustersumoff +
(sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
acg.cg_nextfreeoff = acg.cg_clusteroff +
howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
}
if (acg.cg_nextfreeoff > sblock.fs_cgsize) {
printf("Panic: cylinder group too big\n");
exit(37);
}
acg.cg_cs.cs_nifree += sblock.fs_ipg;
if (cylno == 0)
for (i = 0; i < (long)ROOTINO; i++) {
setbit(cg_inosused(&acg), i);
acg.cg_cs.cs_nifree--;
}
if (cylno > 0) {
/*
* In cylno 0, beginning space is reserved
* for boot and super blocks.
*/
for (d = 0; d < dlower; d += sblock.fs_frag) {
blkno = d / sblock.fs_frag;
setblock(&sblock, cg_blksfree(&acg), blkno);
if (sblock.fs_contigsumsize > 0)
setbit(cg_clustersfree(&acg), blkno);
acg.cg_cs.cs_nbfree++;
}
}
if ((i = dupper % sblock.fs_frag)) {
acg.cg_frsum[sblock.fs_frag - i]++;
for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) {
setbit(cg_blksfree(&acg), dupper);
acg.cg_cs.cs_nffree++;
}
}
for (d = dupper; d + sblock.fs_frag <= acg.cg_ndblk;
d += sblock.fs_frag) {
blkno = d / sblock.fs_frag;
setblock(&sblock, cg_blksfree(&acg), blkno);
if (sblock.fs_contigsumsize > 0)
setbit(cg_clustersfree(&acg), blkno);
acg.cg_cs.cs_nbfree++;
}
if (d < acg.cg_ndblk) {
acg.cg_frsum[acg.cg_ndblk - d]++;
for (; d < acg.cg_ndblk; d++) {
setbit(cg_blksfree(&acg), d);
acg.cg_cs.cs_nffree++;
}
}
if (sblock.fs_contigsumsize > 0) {
int32_t *sump = cg_clustersum(&acg);
u_char *mapp = cg_clustersfree(&acg);
int map = *mapp++;
int bit = 1;
int run = 0;
for (i = 0; i < acg.cg_nclusterblks; i++) {
if ((map & bit) != 0)
run++;
else if (run != 0) {
if (run > sblock.fs_contigsumsize)
run = sblock.fs_contigsumsize;
sump[run]++;
run = 0;
}
if ((i & (CHAR_BIT - 1)) != CHAR_BIT - 1)
bit <<= 1;
else {
map = *mapp++;
bit = 1;
}
}
if (run != 0) {
if (run > sblock.fs_contigsumsize)
run = sblock.fs_contigsumsize;
sump[run]++;
}
}
*cs = acg.cg_cs;
/*
* Write out the duplicate super block, the cylinder group map
* and two blocks worth of inodes in a single write.
*/
start = sblock.fs_bsize > SBLOCKSIZE ? sblock.fs_bsize : SBLOCKSIZE;
bcopy((char *)&acg, &iobuf[start], sblock.fs_cgsize);
start += sblock.fs_bsize;
dp1 = (struct ufs1_dinode *)(&iobuf[start]);
dp2 = (struct ufs2_dinode *)(&iobuf[start]);
for (i = 0; i < acg.cg_initediblk; i++) {
if (sblock.fs_magic == FS_UFS1_MAGIC) {
dp1->di_gen = random();
dp1++;
} else {
dp2->di_gen = random();
dp2++;
}
}
wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)), iobufsize, iobuf);
/*
* For the old file system, we have to initialize all the inodes.
*/
if (Oflag == 1) {
for (i = 2 * sblock.fs_frag;
i < sblock.fs_ipg / INOPF(&sblock);
i += sblock.fs_frag) {
dp1 = (struct ufs1_dinode *)(&iobuf[start]);
for (j = 0; j < INOPB(&sblock); j++) {
dp1->di_gen = random();
dp1++;
}
wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i),
sblock.fs_bsize, &iobuf[start]);
}
}
}
/*
* initialize the file system
*/
#define PREDEFDIR 2
struct direct root_dir[] = {
{ ROOTINO, sizeof(struct direct), DT_DIR, 1, "." },
{ ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
};
void
fsinit(time_t utime)
{
union dinode node;
memset(&node, 0, sizeof node);
if (sblock.fs_magic == FS_UFS1_MAGIC) {
/*
* initialize the node
*/
node.dp1.di_atime = utime;
node.dp1.di_mtime = utime;
node.dp1.di_ctime = utime;
/*
* create the root directory
*/
node.dp1.di_mode = IFDIR | UMASK;
node.dp1.di_nlink = PREDEFDIR;
node.dp1.di_size = makedir(root_dir, PREDEFDIR);
node.dp1.di_db[0] = alloc(sblock.fs_fsize, node.dp1.di_mode);
node.dp1.di_blocks =
btodb(fragroundup(&sblock, node.dp1.di_size));
wtfs(fsbtodb(&sblock, node.dp1.di_db[0]), sblock.fs_fsize,
iobuf);
} else {
/*
* initialize the node
*/
node.dp2.di_atime = utime;
node.dp2.di_mtime = utime;
node.dp2.di_ctime = utime;
node.dp2.di_birthtime = utime;
/*
* create the root directory
*/
node.dp2.di_mode = IFDIR | UMASK;
node.dp2.di_nlink = PREDEFDIR;
node.dp2.di_size = makedir(root_dir, PREDEFDIR);
node.dp2.di_db[0] = alloc(sblock.fs_fsize, node.dp2.di_mode);
node.dp2.di_blocks =
btodb(fragroundup(&sblock, node.dp2.di_size));
wtfs(fsbtodb(&sblock, node.dp2.di_db[0]), sblock.fs_fsize,
iobuf);
}
iput(&node, ROOTINO);
}
/*
* construct a set of directory entries in "iobuf".
* return size of directory.
*/
int
makedir(struct direct *protodir, int entries)
{
char *cp;
int i, spcleft;
spcleft = DIRBLKSIZ;
memset(iobuf, 0, DIRBLKSIZ);
for (cp = iobuf, i = 0; i < entries - 1; i++) {
protodir[i].d_reclen = DIRSIZ(0, &protodir[i]);
memmove(cp, &protodir[i], protodir[i].d_reclen);
cp += protodir[i].d_reclen;
spcleft -= protodir[i].d_reclen;
}
protodir[i].d_reclen = spcleft;
memmove(cp, &protodir[i], DIRSIZ(0, &protodir[i]));
return (DIRBLKSIZ);
}
/*
* allocate a block or frag
*/
ufs2_daddr_t
alloc(int size, int mode)
{
int i, d, blkno, frag;
rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
(char *)&acg);
if (acg.cg_magic != CG_MAGIC) {
printf("cg 0: bad magic number\n");
return (0);
}
if (acg.cg_cs.cs_nbfree == 0) {
printf("first cylinder group ran out of space\n");
return (0);
}
for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag)
if (isblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag))
goto goth;
printf("internal error: can't find block in cyl 0\n");
return (0);
goth:
blkno = fragstoblks(&sblock, d);
clrblock(&sblock, cg_blksfree(&acg), blkno);
if (sblock.fs_contigsumsize > 0)
clrbit(cg_clustersfree(&acg), blkno);
acg.cg_cs.cs_nbfree--;
sblock.fs_cstotal.cs_nbfree--;
fscs[0].cs_nbfree--;
if (mode & IFDIR) {
acg.cg_cs.cs_ndir++;
sblock.fs_cstotal.cs_ndir++;
fscs[0].cs_ndir++;
}
if (size != sblock.fs_bsize) {
frag = howmany(size, sblock.fs_fsize);
fscs[0].cs_nffree += sblock.fs_frag - frag;
sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag;
acg.cg_cs.cs_nffree += sblock.fs_frag - frag;
acg.cg_frsum[sblock.fs_frag - frag]++;
for (i = frag; i < sblock.fs_frag; i++)
setbit(cg_blksfree(&acg), d + i);
}
wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
(char *)&acg);
return ((ufs2_daddr_t)d);
}
/*
* Allocate an inode on the disk
*/
void
iput(union dinode *ip, ino_t ino)
{
ufs2_daddr_t d;
int c;
c = ino_to_cg(&sblock, ino);
rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
(char *)&acg);
if (acg.cg_magic != CG_MAGIC) {
printf("cg 0: bad magic number\n");
exit(31);
}
acg.cg_cs.cs_nifree--;
setbit(cg_inosused(&acg), ino);
wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
(char *)&acg);
sblock.fs_cstotal.cs_nifree--;
fscs[0].cs_nifree--;
if (ino >= (unsigned long)sblock.fs_ipg * sblock.fs_ncg) {
printf("fsinit: inode value out of range (%d).\n", ino);
exit(32);
}
d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino));
rdfs(d, sblock.fs_bsize, (char *)iobuf);
if (sblock.fs_magic == FS_UFS1_MAGIC)
((struct ufs1_dinode *)iobuf)[ino_to_fsbo(&sblock, ino)] =
ip->dp1;
else
((struct ufs2_dinode *)iobuf)[ino_to_fsbo(&sblock, ino)] =
ip->dp2;
wtfs(d, sblock.fs_bsize, (char *)iobuf);
}
/*
* read a block from the file system
*/
void
rdfs(ufs2_daddr_t bno, int size, char *bf)
{
int n;
wtfsflush();
if (lseek(fso, (off_t)bno * sectorsize, 0) < 0) {
printf("seek error: %ld\n", (long)bno);
err(33, "rdfs");
}
n = read(fso, bf, size);
if (n != size) {
printf("read error: %ld\n", (long)bno);
err(34, "rdfs");
}
}
#define WCSIZE (128 * 1024)
ufs2_daddr_t wc_sect; /* units of sectorsize */
int wc_end; /* bytes */
static char wc[WCSIZE]; /* bytes */
/*
* Flush dirty write behind buffer.
*/
static void
wtfsflush()
{
int n;
if (wc_end) {
if (lseek(fso, (off_t)wc_sect * sectorsize, SEEK_SET) < 0) {
printf("seek error: %ld\n", (long)wc_sect);
err(35, "wtfs - writecombine");
}
n = write(fso, wc, wc_end);
if (n != wc_end) {
printf("write error: %ld\n", (long)wc_sect);
err(36, "wtfs - writecombine");
}
wc_end = 0;
}
}
/*
* write a block to the file system
*/
static void
wtfs(ufs2_daddr_t bno, int size, char *bf)
{
int done, n;
if (Nflag)
return;
done = 0;
if (wc_end == 0 && size <= WCSIZE) {
wc_sect = bno;
bcopy(bf, wc, size);
wc_end = size;
if (wc_end < WCSIZE)
return;
done = 1;
}
if ((off_t)wc_sect * sectorsize + wc_end == (off_t)bno * sectorsize &&
wc_end + size <= WCSIZE) {
bcopy(bf, wc + wc_end, size);
wc_end += size;
if (wc_end < WCSIZE)
return;
done = 1;
}
wtfsflush();
if (done)
return;
if (lseek(fso, (off_t)bno * sectorsize, SEEK_SET) < 0) {
printf("seek error: %ld\n", (long)bno);
err(35, "wtfs");
}
n = write(fso, bf, size);
if (n != size) {
printf("write error: %ld\n", (long)bno);
err(36, "wtfs");
}
}
/*
* check if a block is available
*/
static int
isblock(struct fs *fs, unsigned char *cp, int h)
{
unsigned char mask;
switch (fs->fs_frag) {
case 8:
return (cp[h] == 0xff);
case 4:
mask = 0x0f << ((h & 0x1) << 2);
return ((cp[h >> 1] & mask) == mask);
case 2:
mask = 0x03 << ((h & 0x3) << 1);
return ((cp[h >> 2] & mask) == mask);
case 1:
mask = 0x01 << (h & 0x7);
return ((cp[h >> 3] & mask) == mask);
default:
fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag);
return (0);
}
}
/*
* take a block out of the map
*/
static void
clrblock(struct fs *fs, unsigned char *cp, int h)
{
switch ((fs)->fs_frag) {
case 8:
cp[h] = 0;
return;
case 4:
cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
return;
case 2:
cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
return;
case 1:
cp[h >> 3] &= ~(0x01 << (h & 0x7));
return;
default:
fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag);
return;
}
}
/*
* put a block into the map
*/
static void
setblock(struct fs *fs, unsigned char *cp, int h)
{
switch (fs->fs_frag) {
case 8:
cp[h] = 0xff;
return;
case 4:
cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
return;
case 2:
cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
return;
case 1:
cp[h >> 3] |= (0x01 << (h & 0x7));
return;
default:
fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag);
return;
}
}
/*
* Determine the number of characters in a
* single line.
*/
static int
charsperline(void)
{
int columns;
char *cp;
struct winsize ws;
columns = 0;
if (ioctl(0, TIOCGWINSZ, &ws) != -1)
columns = ws.ws_col;
if (columns == 0 && (cp = getenv("COLUMNS")))
columns = atoi(cp);
if (columns == 0)
columns = 80; /* last resort */
return (columns);
}
static int
ilog2(int val)
{
u_int n;
for (n = 0; n < sizeof(n) * CHAR_BIT; n++)
if (1 << n == val)
return (n);
errx(1, "ilog2: %d is not a power of 2\n", val);
}
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