HardenedBSD/lib/libufs/cgroup.c
Kirk McKusick 72f854ce8f Correct fsck journal-recovery code to update a cylinder-group
check-hash after making changes to the cylinder group. The problem
was that the journal-recovery code was calling the libufs bwrite()
function instead of the cgput() function. The cgput() function updates
the cylinder-group check-hash before writing the cylinder group.

This change required the additions of the cgget() and cgput() functions
to the libufs API to avoid a gratuitous bcopy of every cylinder group
to be read or written. These new functions have been added to the
libufs manual pages. This was the first opportunity that I have had
to use and document the use of the EDOOFUS error code.

Reviewed by: kib
Reported by: emaste and others
2018-01-17 17:58:24 +00:00

269 lines
6.6 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2003 Juli Mallett. All rights reserved.
*
* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
* FreeBSD project. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistribution 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <sys/stat.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libufs.h>
ufs2_daddr_t
cgballoc(struct uufsd *disk)
{
u_int8_t *blksfree;
struct cg *cgp;
struct fs *fs;
long bno;
fs = &disk->d_fs;
cgp = &disk->d_cg;
blksfree = cg_blksfree(cgp);
for (bno = 0; bno < fs->fs_fpg / fs->fs_frag; bno++)
if (ffs_isblock(fs, blksfree, bno))
goto gotit;
return (0);
gotit:
fs->fs_cs(fs, cgp->cg_cgx).cs_nbfree--;
ffs_clrblock(fs, blksfree, (long)bno);
ffs_clusteracct(fs, cgp, bno, -1);
cgp->cg_cs.cs_nbfree--;
fs->fs_cstotal.cs_nbfree--;
fs->fs_fmod = 1;
return (cgbase(fs, cgp->cg_cgx) + blkstofrags(fs, bno));
}
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);
}
ino_t
cgialloc(struct uufsd *disk)
{
struct ufs2_dinode *dp2;
u_int8_t *inosused;
struct cg *cgp;
struct fs *fs;
ino_t ino;
int i;
fs = &disk->d_fs;
cgp = &disk->d_cg;
inosused = cg_inosused(cgp);
for (ino = 0; ino < fs->fs_ipg; ino++)
if (isclr(inosused, ino))
goto gotit;
return (0);
gotit:
if (fs->fs_magic == FS_UFS2_MAGIC &&
ino + INOPB(fs) > cgp->cg_initediblk &&
cgp->cg_initediblk < cgp->cg_niblk) {
char block[MAXBSIZE];
bzero(block, (int)fs->fs_bsize);
dp2 = (struct ufs2_dinode *)&block;
for (i = 0; i < INOPB(fs); i++) {
dp2->di_gen = arc4random();
dp2++;
}
if (bwrite(disk, ino_to_fsba(fs,
cgp->cg_cgx * fs->fs_ipg + cgp->cg_initediblk),
block, fs->fs_bsize))
return (0);
cgp->cg_initediblk += INOPB(fs);
}
setbit(inosused, ino);
cgp->cg_irotor = ino;
cgp->cg_cs.cs_nifree--;
fs->fs_cstotal.cs_nifree--;
fs->fs_cs(fs, cgp->cg_cgx).cs_nifree--;
fs->fs_fmod = 1;
return (ino + (cgp->cg_cgx * fs->fs_ipg));
}
int
cgread(struct uufsd *disk)
{
if (disk->d_ccg >= disk->d_fs.fs_ncg)
return (0);
return (cgread1(disk, disk->d_ccg++));
}
int
cgread1(struct uufsd *disk, int c)
{
if ((cgget(disk, c, &disk->d_cg)) == 0)
return (1);
return (-1);
}
int
cgget(struct uufsd *disk, int cg, struct cg *cgp)
{
struct fs *fs;
uint32_t cghash, calchash;
fs = &disk->d_fs;
if (bread(disk, fsbtodb(fs, cgtod(fs, cg)), (void *)cgp,
fs->fs_cgsize) == -1) {
ERROR(disk, "unable to read cylinder group");
return (-1);
}
calchash = cgp->cg_ckhash;
if ((fs->fs_metackhash & CK_CYLGRP) != 0) {
cghash = cgp->cg_ckhash;
cgp->cg_ckhash = 0;
calchash = calculate_crc32c(~0L, (void *)cgp, fs->fs_cgsize);
cgp->cg_ckhash = cghash;
}
if (cgp->cg_ckhash != calchash || !cg_chkmagic(cgp) ||
cgp->cg_cgx != cg) {
ERROR(disk, "cylinder group checks failed");
errno = EIO;
return (-1);
}
disk->d_lcg = cg;
return (0);
}
int
cgwrite(struct uufsd *disk)
{
return (cgput(disk, &disk->d_cg));
}
int
cgwrite1(struct uufsd *disk, int cg)
{
static char errmsg[BUFSIZ];
if (cg == disk->d_cg.cg_cgx)
return (cgput(disk, &disk->d_cg));
snprintf(errmsg, BUFSIZ, "Cylinder group %d in buffer does not match "
"the cylinder group %d that cgwrite1 requested",
disk->d_cg.cg_cgx, cg);
ERROR(disk, errmsg);
errno = EDOOFUS;
return (-1);
}
int
cgput(struct uufsd *disk, struct cg *cgp)
{
struct fs *fs;
fs = &disk->d_fs;
if ((fs->fs_metackhash & CK_CYLGRP) != 0) {
cgp->cg_ckhash = 0;
cgp->cg_ckhash =
calculate_crc32c(~0L, (void *)cgp, fs->fs_cgsize);
}
if (bwrite(disk, fsbtodb(fs, cgtod(fs, cgp->cg_cgx)), cgp,
fs->fs_cgsize) == -1) {
ERROR(disk, "unable to write cylinder group");
return (-1);
}
return (0);
}