a2d1957bbc
Check for an uninitialed (zero valued) fs_maxbsize and set it to its minimum valid size (fs_bsize). Uninitialed fs_maxbsize were left by older versions of makefs(8) and the superblock integrity checks fail when they are found. No legitimate superblocks should fail as a result of these changes. MFC after: 1 week Sponsored by: The FreeBSD Foundation
1110 lines
34 KiB
C
1110 lines
34 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1982, 1986, 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. 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.
|
|
*
|
|
* @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/limits.h>
|
|
|
|
#ifndef _KERNEL
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <sys/errno.h>
|
|
#include <ufs/ufs/dinode.h>
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
uint32_t calculate_crc32c(uint32_t, const void *, size_t);
|
|
uint32_t ffs_calc_sbhash(struct fs *);
|
|
struct malloc_type;
|
|
#define UFS_MALLOC(size, type, flags) malloc(size)
|
|
#define UFS_FREE(ptr, type) free(ptr)
|
|
#define maxphys MAXPHYS
|
|
|
|
#else /* _KERNEL */
|
|
#include <sys/systm.h>
|
|
#include <sys/gsb_crc32.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/ucred.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/extattr.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
#include <ufs/ffs/ffs_extern.h>
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
#define UFS_MALLOC(size, type, flags) malloc(size, type, flags)
|
|
#define UFS_FREE(ptr, type) free(ptr, type)
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Verify an inode check-hash.
|
|
*/
|
|
int
|
|
ffs_verify_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
|
|
{
|
|
uint32_t ckhash, save_ckhash;
|
|
|
|
/*
|
|
* Return success if unallocated or we are not doing inode check-hash.
|
|
*/
|
|
if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
|
|
return (0);
|
|
/*
|
|
* Exclude di_ckhash from the crc32 calculation, e.g., always use
|
|
* a check-hash value of zero when calculating the check-hash.
|
|
*/
|
|
save_ckhash = dip->di_ckhash;
|
|
dip->di_ckhash = 0;
|
|
ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
|
|
dip->di_ckhash = save_ckhash;
|
|
if (save_ckhash == ckhash)
|
|
return (0);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Update an inode check-hash.
|
|
*/
|
|
void
|
|
ffs_update_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip)
|
|
{
|
|
|
|
if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0)
|
|
return;
|
|
/*
|
|
* Exclude old di_ckhash from the crc32 calculation, e.g., always use
|
|
* a check-hash value of zero when calculating the new check-hash.
|
|
*/
|
|
dip->di_ckhash = 0;
|
|
dip->di_ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip));
|
|
}
|
|
|
|
/*
|
|
* These are the low-level functions that actually read and write
|
|
* the superblock and its associated data.
|
|
*/
|
|
static off_t sblock_try[] = SBLOCKSEARCH;
|
|
static int readsuper(void *, struct fs **, off_t, int,
|
|
int (*)(void *, off_t, void **, int));
|
|
static int validate_sblock(struct fs *, int);
|
|
|
|
/*
|
|
* Read a superblock from the devfd device.
|
|
*
|
|
* If an alternate superblock is specified, it is read. Otherwise the
|
|
* set of locations given in the SBLOCKSEARCH list is searched for a
|
|
* superblock. Memory is allocated for the superblock by the readfunc and
|
|
* is returned. If filltype is non-NULL, additional memory is allocated
|
|
* of type filltype and filled in with the superblock summary information.
|
|
* All memory is freed when any error is returned.
|
|
*
|
|
* If a superblock is found, zero is returned. Otherwise one of the
|
|
* following error values is returned:
|
|
* EIO: non-existent or truncated superblock.
|
|
* EIO: error reading summary information.
|
|
* ENOENT: no usable known superblock found.
|
|
* EILSEQ: filesystem with wrong byte order found.
|
|
* ENOMEM: failed to allocate space for the superblock.
|
|
* EINVAL: The previous newfs operation on this volume did not complete.
|
|
* The administrator must complete newfs before using this volume.
|
|
*/
|
|
int
|
|
ffs_sbget(void *devfd, struct fs **fsp, off_t sblock, int flags,
|
|
struct malloc_type *filltype,
|
|
int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
|
|
{
|
|
struct fs *fs;
|
|
struct fs_summary_info *fs_si;
|
|
int i, error;
|
|
uint64_t size, blks;
|
|
uint8_t *space;
|
|
int32_t *lp;
|
|
char *buf;
|
|
|
|
fs = NULL;
|
|
*fsp = NULL;
|
|
if (sblock != UFS_STDSB) {
|
|
if ((error = readsuper(devfd, &fs, sblock,
|
|
flags | UFS_ALTSBLK, readfunc)) != 0) {
|
|
if (fs != NULL)
|
|
UFS_FREE(fs, filltype);
|
|
return (error);
|
|
}
|
|
} else {
|
|
for (i = 0; sblock_try[i] != -1; i++) {
|
|
if ((error = readsuper(devfd, &fs, sblock_try[i],
|
|
flags, readfunc)) == 0) {
|
|
if ((flags & UFS_NOCSUM) != 0) {
|
|
*fsp = fs;
|
|
return (0);
|
|
}
|
|
break;
|
|
}
|
|
if (fs != NULL) {
|
|
UFS_FREE(fs, filltype);
|
|
fs = NULL;
|
|
}
|
|
if (error == ENOENT)
|
|
continue;
|
|
return (error);
|
|
}
|
|
if (sblock_try[i] == -1)
|
|
return (ENOENT);
|
|
}
|
|
/*
|
|
* Read in the superblock summary information.
|
|
*/
|
|
size = fs->fs_cssize;
|
|
blks = howmany(size, fs->fs_fsize);
|
|
if (fs->fs_contigsumsize > 0)
|
|
size += fs->fs_ncg * sizeof(int32_t);
|
|
size += fs->fs_ncg * sizeof(u_int8_t);
|
|
if ((fs_si = UFS_MALLOC(sizeof(*fs_si), filltype, M_NOWAIT)) == NULL) {
|
|
UFS_FREE(fs, filltype);
|
|
return (ENOMEM);
|
|
}
|
|
bzero(fs_si, sizeof(*fs_si));
|
|
fs->fs_si = fs_si;
|
|
if ((space = UFS_MALLOC(size, filltype, M_NOWAIT)) == NULL) {
|
|
UFS_FREE(fs->fs_si, filltype);
|
|
UFS_FREE(fs, filltype);
|
|
return (ENOMEM);
|
|
}
|
|
fs->fs_csp = (struct csum *)space;
|
|
for (i = 0; i < blks; i += fs->fs_frag) {
|
|
size = fs->fs_bsize;
|
|
if (i + fs->fs_frag > blks)
|
|
size = (blks - i) * fs->fs_fsize;
|
|
buf = NULL;
|
|
error = (*readfunc)(devfd,
|
|
dbtob(fsbtodb(fs, fs->fs_csaddr + i)), (void **)&buf, size);
|
|
if (error) {
|
|
if (buf != NULL)
|
|
UFS_FREE(buf, filltype);
|
|
UFS_FREE(fs->fs_csp, filltype);
|
|
UFS_FREE(fs->fs_si, filltype);
|
|
UFS_FREE(fs, filltype);
|
|
return (error);
|
|
}
|
|
memcpy(space, buf, size);
|
|
UFS_FREE(buf, filltype);
|
|
space += size;
|
|
}
|
|
if (fs->fs_contigsumsize > 0) {
|
|
fs->fs_maxcluster = lp = (int32_t *)space;
|
|
for (i = 0; i < fs->fs_ncg; i++)
|
|
*lp++ = fs->fs_contigsumsize;
|
|
space = (uint8_t *)lp;
|
|
}
|
|
size = fs->fs_ncg * sizeof(u_int8_t);
|
|
fs->fs_contigdirs = (u_int8_t *)space;
|
|
bzero(fs->fs_contigdirs, size);
|
|
*fsp = fs;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Try to read a superblock from the location specified by sblockloc.
|
|
* Return zero on success or an errno on failure.
|
|
*/
|
|
static int
|
|
readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int flags,
|
|
int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
|
|
{
|
|
struct fs *fs;
|
|
int error, res;
|
|
uint32_t ckhash;
|
|
|
|
error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE);
|
|
if (error != 0)
|
|
return (error);
|
|
fs = *fsp;
|
|
if (fs->fs_magic == FS_BAD_MAGIC)
|
|
return (EINVAL);
|
|
/*
|
|
* For UFS1 with a 65536 block size, the first backup superblock
|
|
* is at the same location as the UFS2 superblock. Since SBLOCK_UFS2
|
|
* is the first location checked, the first backup is the superblock
|
|
* that will be accessed. Here we fail the lookup so that we can
|
|
* retry with the correct location for the UFS1 superblock.
|
|
*/
|
|
if (fs->fs_magic == FS_UFS1_MAGIC && (flags & UFS_ALTSBLK) == 0 &&
|
|
fs->fs_bsize == SBLOCK_UFS2 && sblockloc == SBLOCK_UFS2)
|
|
return (ENOENT);
|
|
if ((error = validate_sblock(fs, flags)) > 0)
|
|
return (error);
|
|
/*
|
|
* If the filesystem has been run on a kernel without
|
|
* metadata check hashes, disable them.
|
|
*/
|
|
if ((fs->fs_flags & FS_METACKHASH) == 0)
|
|
fs->fs_metackhash = 0;
|
|
/*
|
|
* Clear any check-hashes that are not maintained
|
|
* by this kernel. Also clear any unsupported flags.
|
|
*/
|
|
fs->fs_metackhash &= CK_SUPPORTED;
|
|
fs->fs_flags &= FS_SUPPORTED;
|
|
if (fs->fs_ckhash != (ckhash = ffs_calc_sbhash(fs))) {
|
|
if ((flags & (UFS_NOMSG | UFS_NOHASHFAIL)) ==
|
|
(UFS_NOMSG | UFS_NOHASHFAIL))
|
|
return (0);
|
|
if ((flags & UFS_NOMSG) != 0)
|
|
return (EINTEGRITY);
|
|
#ifdef _KERNEL
|
|
res = uprintf("Superblock check-hash failed: recorded "
|
|
"check-hash 0x%x != computed check-hash 0x%x%s\n",
|
|
fs->fs_ckhash, ckhash,
|
|
(flags & UFS_NOHASHFAIL) != 0 ? " (Ignored)" : "");
|
|
#else
|
|
res = 0;
|
|
#endif
|
|
/*
|
|
* Print check-hash failure if no controlling terminal
|
|
* in kernel or always if in user-mode (libufs).
|
|
*/
|
|
if (res == 0)
|
|
printf("Superblock check-hash failed: recorded "
|
|
"check-hash 0x%x != computed check-hash "
|
|
"0x%x%s\n", fs->fs_ckhash, ckhash,
|
|
(flags & UFS_NOHASHFAIL) ? " (Ignored)" : "");
|
|
if ((flags & UFS_NOHASHFAIL) != 0)
|
|
return (0);
|
|
return (EINTEGRITY);
|
|
}
|
|
/* Have to set for old filesystems that predate this field */
|
|
fs->fs_sblockactualloc = sblockloc;
|
|
/* Not yet any summary information */
|
|
fs->fs_si = NULL;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Verify the filesystem values.
|
|
*/
|
|
#define ILOG2(num) (fls(num) - 1)
|
|
#ifdef STANDALONE_SMALL
|
|
#define MPRINT(...) do { } while (0)
|
|
#else
|
|
#define MPRINT(...) if (prtmsg) printf(__VA_ARGS__)
|
|
#endif
|
|
#define FCHK(lhs, op, rhs, fmt) \
|
|
if (lhs op rhs) { \
|
|
MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \
|
|
#fmt ")\n", fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2, \
|
|
#lhs, (intmax_t)lhs, #op, #rhs, (intmax_t)rhs); \
|
|
if (error < 0) \
|
|
return (ENOENT); \
|
|
if (error == 0) \
|
|
error = ENOENT; \
|
|
}
|
|
#define WCHK(lhs, op, rhs, fmt) \
|
|
if (lhs op rhs) { \
|
|
MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \
|
|
#fmt ")%s\n", fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2,\
|
|
#lhs, (intmax_t)lhs, #op, #rhs, (intmax_t)rhs, wmsg);\
|
|
if (error == 0) \
|
|
error = warnerr; \
|
|
if (warnerr == 0) \
|
|
lhs = rhs; \
|
|
}
|
|
#define FCHK2(lhs1, op1, rhs1, lhs2, op2, rhs2, fmt) \
|
|
if (lhs1 op1 rhs1 && lhs2 op2 rhs2) { \
|
|
MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \
|
|
#fmt ") && %s (" #fmt ") %s %s (" #fmt ")\n", \
|
|
fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2, #lhs1, \
|
|
(intmax_t)lhs1, #op1, #rhs1, (intmax_t)rhs1, #lhs2, \
|
|
(intmax_t)lhs2, #op2, #rhs2, (intmax_t)rhs2); \
|
|
if (error < 0) \
|
|
return (ENOENT); \
|
|
if (error == 0) \
|
|
error = ENOENT; \
|
|
}
|
|
|
|
static int
|
|
validate_sblock(struct fs *fs, int flags)
|
|
{
|
|
u_long i, sectorsize;
|
|
u_int64_t maxfilesize, sizepb;
|
|
int error, prtmsg, warnerr;
|
|
char *wmsg;
|
|
|
|
error = 0;
|
|
sectorsize = dbtob(1);
|
|
prtmsg = ((flags & UFS_NOMSG) == 0);
|
|
warnerr = (flags & UFS_NOWARNFAIL) == UFS_NOWARNFAIL ? 0 : ENOENT;
|
|
wmsg = warnerr ? "" : " (Ignored)";
|
|
/*
|
|
* Check for endian mismatch between machine and filesystem.
|
|
*/
|
|
if (((fs->fs_magic != FS_UFS2_MAGIC) &&
|
|
(bswap32(fs->fs_magic) == FS_UFS2_MAGIC)) ||
|
|
((fs->fs_magic != FS_UFS1_MAGIC) &&
|
|
(bswap32(fs->fs_magic) == FS_UFS1_MAGIC))) {
|
|
MPRINT("UFS superblock failed due to endian mismatch "
|
|
"between machine and filesystem\n");
|
|
return(EILSEQ);
|
|
}
|
|
/*
|
|
* If just validating for recovery, then do just the minimal
|
|
* checks needed for the superblock fields needed to find
|
|
* alternate superblocks.
|
|
*/
|
|
if ((flags & UFS_FSRONLY) == UFS_FSRONLY &&
|
|
(fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC)) {
|
|
error = -1; /* fail on first error */
|
|
if (fs->fs_magic == FS_UFS2_MAGIC) {
|
|
FCHK(fs->fs_sblockloc, !=, SBLOCK_UFS2, %#jx);
|
|
} else if (fs->fs_magic == FS_UFS1_MAGIC) {
|
|
FCHK(fs->fs_sblockloc, <, 0, %jd);
|
|
FCHK(fs->fs_sblockloc, >, SBLOCK_UFS1, %jd);
|
|
FCHK(fs->fs_old_ncyl, !=, fs->fs_ncg, %jd);
|
|
}
|
|
FCHK(fs->fs_frag, <, 1, %jd);
|
|
FCHK(fs->fs_frag, >, MAXFRAG, %jd);
|
|
FCHK(fs->fs_bsize, <, MINBSIZE, %jd);
|
|
FCHK(fs->fs_bsize, >, MAXBSIZE, %jd);
|
|
FCHK(fs->fs_bsize, <, roundup(sizeof(struct fs), DEV_BSIZE),
|
|
%jd);
|
|
FCHK(fs->fs_fsize, <, sectorsize, %jd);
|
|
FCHK(fs->fs_fsize * fs->fs_frag, !=, fs->fs_bsize, %jd);
|
|
FCHK(powerof2(fs->fs_fsize), ==, 0, %jd);
|
|
FCHK(fs->fs_sbsize, >, SBLOCKSIZE, %jd);
|
|
FCHK(fs->fs_sbsize, <, (signed)sizeof(struct fs), %jd);
|
|
FCHK(fs->fs_sbsize % sectorsize, !=, 0, %jd);
|
|
FCHK(fs->fs_fpg, <, 3 * fs->fs_frag, %jd);
|
|
FCHK(fs->fs_ncg, <, 1, %jd);
|
|
FCHK(fs->fs_fsbtodb, !=, ILOG2(fs->fs_fsize / sectorsize), %jd);
|
|
FCHK(fs->fs_old_cgoffset, <, 0, %jd);
|
|
FCHK2(fs->fs_old_cgoffset, >, 0, ~fs->fs_old_cgmask, <, 0, %jd);
|
|
FCHK(fs->fs_old_cgoffset * (~fs->fs_old_cgmask), >, fs->fs_fpg,
|
|
%jd);
|
|
FCHK(fs->fs_sblkno, !=, roundup(
|
|
howmany(fs->fs_sblockloc + SBLOCKSIZE, fs->fs_fsize),
|
|
fs->fs_frag), %jd);
|
|
FCHK(CGSIZE(fs), >, fs->fs_bsize, %jd);
|
|
/* Only need to validate these if reading in csum data */
|
|
if ((flags & UFS_NOCSUM) != 0)
|
|
return (error);
|
|
FCHK((u_int64_t)fs->fs_ipg * fs->fs_ncg, >,
|
|
(((int64_t)(1)) << 32) - INOPB(fs), %jd);
|
|
FCHK(fs->fs_cstotal.cs_nifree, <, 0, %jd);
|
|
FCHK(fs->fs_cstotal.cs_nifree, >,
|
|
(u_int64_t)fs->fs_ipg * fs->fs_ncg, %jd);
|
|
FCHK(fs->fs_cstotal.cs_ndir, >,
|
|
((u_int64_t)fs->fs_ipg * fs->fs_ncg) -
|
|
fs->fs_cstotal.cs_nifree, %jd);
|
|
FCHK(fs->fs_size, <, 8 * fs->fs_frag, %jd);
|
|
FCHK(fs->fs_size, <=, ((int64_t)fs->fs_ncg - 1) * fs->fs_fpg,
|
|
%jd);
|
|
FCHK(fs->fs_size, >, (int64_t)fs->fs_ncg * fs->fs_fpg, %jd);
|
|
FCHK(fs->fs_csaddr, <, 0, %jd);
|
|
FCHK(fs->fs_cssize, !=,
|
|
fragroundup(fs, fs->fs_ncg * sizeof(struct csum)), %jd);
|
|
FCHK(dtog(fs, fs->fs_csaddr), >, fs->fs_ncg, %jd);
|
|
FCHK(fs->fs_csaddr, <, cgdmin(fs, dtog(fs, fs->fs_csaddr)),
|
|
%jd);
|
|
FCHK(dtog(fs, fs->fs_csaddr + howmany(fs->fs_cssize,
|
|
fs->fs_fsize)), >, dtog(fs, fs->fs_csaddr), %jd);
|
|
return (error);
|
|
}
|
|
if (fs->fs_magic == FS_UFS2_MAGIC) {
|
|
if ((flags & UFS_ALTSBLK) == 0)
|
|
FCHK2(fs->fs_sblockactualloc, !=, SBLOCK_UFS2,
|
|
fs->fs_sblockactualloc, !=, 0, %jd);
|
|
FCHK(fs->fs_sblockloc, !=, SBLOCK_UFS2, %#jx);
|
|
FCHK(fs->fs_maxsymlinklen, !=, ((UFS_NDADDR + UFS_NIADDR) *
|
|
sizeof(ufs2_daddr_t)), %jd);
|
|
FCHK(fs->fs_nindir, !=, fs->fs_bsize / sizeof(ufs2_daddr_t),
|
|
%jd);
|
|
FCHK(fs->fs_inopb, !=,
|
|
fs->fs_bsize / sizeof(struct ufs2_dinode), %jd);
|
|
} else if (fs->fs_magic == FS_UFS1_MAGIC) {
|
|
if ((flags & UFS_ALTSBLK) == 0)
|
|
FCHK(fs->fs_sblockactualloc, >, SBLOCK_UFS1, %jd);
|
|
FCHK(fs->fs_sblockloc, <, 0, %jd);
|
|
FCHK(fs->fs_sblockloc, >, SBLOCK_UFS1, %jd);
|
|
FCHK(fs->fs_nindir, !=, fs->fs_bsize / sizeof(ufs1_daddr_t),
|
|
%jd);
|
|
FCHK(fs->fs_inopb, !=,
|
|
fs->fs_bsize / sizeof(struct ufs1_dinode), %jd);
|
|
FCHK(fs->fs_maxsymlinklen, !=, ((UFS_NDADDR + UFS_NIADDR) *
|
|
sizeof(ufs1_daddr_t)), %jd);
|
|
WCHK(fs->fs_old_inodefmt, !=, FS_44INODEFMT, %jd);
|
|
WCHK(fs->fs_old_rotdelay, !=, 0, %jd);
|
|
WCHK(fs->fs_old_rps, !=, 60, %jd);
|
|
WCHK(fs->fs_old_nspf, !=, fs->fs_fsize / sectorsize, %jd);
|
|
FCHK(fs->fs_old_cpg, !=, 1, %jd);
|
|
WCHK(fs->fs_old_interleave, !=, 1, %jd);
|
|
WCHK(fs->fs_old_trackskew, !=, 0, %jd);
|
|
WCHK(fs->fs_old_cpc, !=, 0, %jd);
|
|
WCHK(fs->fs_old_postblformat, !=, 1, %jd);
|
|
FCHK(fs->fs_old_nrpos, !=, 1, %jd);
|
|
WCHK(fs->fs_old_spc, !=, fs->fs_fpg * fs->fs_old_nspf, %jd);
|
|
WCHK(fs->fs_old_nsect, !=, fs->fs_old_spc, %jd);
|
|
WCHK(fs->fs_old_npsect, !=, fs->fs_old_spc, %jd);
|
|
FCHK(fs->fs_old_ncyl, !=, fs->fs_ncg, %jd);
|
|
} else {
|
|
/* Bad magic number, so assume not a superblock */
|
|
return (ENOENT);
|
|
}
|
|
FCHK(fs->fs_bsize, <, MINBSIZE, %jd);
|
|
FCHK(fs->fs_bsize, >, MAXBSIZE, %jd);
|
|
FCHK(fs->fs_bsize, <, roundup(sizeof(struct fs), DEV_BSIZE), %jd);
|
|
FCHK(powerof2(fs->fs_bsize), ==, 0, %jd);
|
|
FCHK(fs->fs_frag, <, 1, %jd);
|
|
FCHK(fs->fs_frag, >, MAXFRAG, %jd);
|
|
FCHK(fs->fs_frag, !=, numfrags(fs, fs->fs_bsize), %jd);
|
|
FCHK(fs->fs_fsize, <, sectorsize, %jd);
|
|
FCHK(fs->fs_fsize * fs->fs_frag, !=, fs->fs_bsize, %jd);
|
|
FCHK(powerof2(fs->fs_fsize), ==, 0, %jd);
|
|
FCHK(fs->fs_fpg, <, 3 * fs->fs_frag, %jd);
|
|
FCHK(fs->fs_ncg, <, 1, %jd);
|
|
FCHK(fs->fs_ipg, <, fs->fs_inopb, %jd);
|
|
FCHK((u_int64_t)fs->fs_ipg * fs->fs_ncg, >,
|
|
(((int64_t)(1)) << 32) - INOPB(fs), %jd);
|
|
FCHK(fs->fs_cstotal.cs_nifree, <, 0, %jd);
|
|
FCHK(fs->fs_cstotal.cs_nifree, >, (u_int64_t)fs->fs_ipg * fs->fs_ncg,
|
|
%jd);
|
|
FCHK(fs->fs_cstotal.cs_ndir, <, 0, %jd);
|
|
FCHK(fs->fs_cstotal.cs_ndir, >,
|
|
((u_int64_t)fs->fs_ipg * fs->fs_ncg) - fs->fs_cstotal.cs_nifree,
|
|
%jd);
|
|
FCHK(fs->fs_sbsize, >, SBLOCKSIZE, %jd);
|
|
FCHK(fs->fs_sbsize, <, (signed)sizeof(struct fs), %jd);
|
|
/* fix for misconfigured filesystems */
|
|
if (fs->fs_maxbsize == 0)
|
|
fs->fs_maxbsize = fs->fs_bsize;
|
|
FCHK(fs->fs_maxbsize, <, fs->fs_bsize, %jd);
|
|
FCHK(powerof2(fs->fs_maxbsize), ==, 0, %jd);
|
|
FCHK(fs->fs_maxbsize, >, FS_MAXCONTIG * fs->fs_bsize, %jd);
|
|
FCHK(fs->fs_bmask, !=, ~(fs->fs_bsize - 1), %#jx);
|
|
FCHK(fs->fs_fmask, !=, ~(fs->fs_fsize - 1), %#jx);
|
|
FCHK(fs->fs_qbmask, !=, ~fs->fs_bmask, %#jx);
|
|
FCHK(fs->fs_qfmask, !=, ~fs->fs_fmask, %#jx);
|
|
FCHK(fs->fs_bshift, !=, ILOG2(fs->fs_bsize), %jd);
|
|
FCHK(fs->fs_fshift, !=, ILOG2(fs->fs_fsize), %jd);
|
|
FCHK(fs->fs_fragshift, !=, ILOG2(fs->fs_frag), %jd);
|
|
FCHK(fs->fs_fsbtodb, !=, ILOG2(fs->fs_fsize / sectorsize), %jd);
|
|
FCHK(fs->fs_old_cgoffset, <, 0, %jd);
|
|
FCHK2(fs->fs_old_cgoffset, >, 0, ~fs->fs_old_cgmask, <, 0, %jd);
|
|
FCHK(fs->fs_old_cgoffset * (~fs->fs_old_cgmask), >, fs->fs_fpg, %jd);
|
|
FCHK(CGSIZE(fs), >, fs->fs_bsize, %jd);
|
|
/*
|
|
* If anything has failed up to this point, it is usafe to proceed
|
|
* as checks below may divide by zero or make other fatal calculations.
|
|
* So if we have any errors at this point, give up.
|
|
*/
|
|
if (error)
|
|
return (error);
|
|
FCHK(fs->fs_sbsize % sectorsize, !=, 0, %jd);
|
|
FCHK(fs->fs_ipg % fs->fs_inopb, !=, 0, %jd);
|
|
FCHK(fs->fs_sblkno, !=, roundup(
|
|
howmany(fs->fs_sblockloc + SBLOCKSIZE, fs->fs_fsize),
|
|
fs->fs_frag), %jd);
|
|
FCHK(fs->fs_cblkno, !=, fs->fs_sblkno +
|
|
roundup(howmany(SBLOCKSIZE, fs->fs_fsize), fs->fs_frag), %jd);
|
|
FCHK(fs->fs_iblkno, !=, fs->fs_cblkno + fs->fs_frag, %jd);
|
|
FCHK(fs->fs_dblkno, !=, fs->fs_iblkno + fs->fs_ipg / INOPF(fs), %jd);
|
|
FCHK(fs->fs_cgsize, >, fs->fs_bsize, %jd);
|
|
FCHK(fs->fs_cgsize, <, fs->fs_fsize, %jd);
|
|
FCHK(fs->fs_cgsize % fs->fs_fsize, !=, 0, %jd);
|
|
/*
|
|
* This test is valid, however older versions of growfs failed
|
|
* to correctly update fs_dsize so will fail this test. Thus we
|
|
* exclude it from the requirements.
|
|
*/
|
|
#ifdef notdef
|
|
WCHK(fs->fs_dsize, !=, fs->fs_size - fs->fs_sblkno -
|
|
fs->fs_ncg * (fs->fs_dblkno - fs->fs_sblkno) -
|
|
howmany(fs->fs_cssize, fs->fs_fsize), %jd);
|
|
#endif
|
|
WCHK(fs->fs_metaspace, <, 0, %jd);
|
|
WCHK(fs->fs_metaspace, >, fs->fs_fpg / 2, %jd);
|
|
WCHK(fs->fs_minfree, >, 99, %jd%%);
|
|
maxfilesize = fs->fs_bsize * UFS_NDADDR - 1;
|
|
for (sizepb = fs->fs_bsize, i = 0; i < UFS_NIADDR; i++) {
|
|
sizepb *= NINDIR(fs);
|
|
maxfilesize += sizepb;
|
|
}
|
|
WCHK(fs->fs_maxfilesize, !=, maxfilesize, %jd);
|
|
/*
|
|
* These values have a tight interaction with each other that
|
|
* makes it hard to tightly bound them. So we can only check
|
|
* that they are within a broader possible range.
|
|
*
|
|
* The size cannot always be accurately determined, but ensure
|
|
* that it is consistent with the number of cylinder groups (fs_ncg)
|
|
* and the number of fragments per cylinder group (fs_fpg). Ensure
|
|
* that the summary information size is correct and that it starts
|
|
* and ends in the data area of the same cylinder group.
|
|
*/
|
|
FCHK(fs->fs_size, <, 8 * fs->fs_frag, %jd);
|
|
FCHK(fs->fs_size, <=, ((int64_t)fs->fs_ncg - 1) * fs->fs_fpg, %jd);
|
|
FCHK(fs->fs_size, >, (int64_t)fs->fs_ncg * fs->fs_fpg, %jd);
|
|
/*
|
|
* If we are not requested to read in the csum data stop here
|
|
* as the correctness of the remaining values is only important
|
|
* to bound the space needed to be allocated to hold the csum data.
|
|
*/
|
|
if ((flags & UFS_NOCSUM) != 0)
|
|
return (error);
|
|
FCHK(fs->fs_csaddr, <, 0, %jd);
|
|
FCHK(fs->fs_cssize, !=,
|
|
fragroundup(fs, fs->fs_ncg * sizeof(struct csum)), %jd);
|
|
FCHK(dtog(fs, fs->fs_csaddr), >, fs->fs_ncg, %jd);
|
|
FCHK(fs->fs_csaddr, <, cgdmin(fs, dtog(fs, fs->fs_csaddr)), %jd);
|
|
FCHK(dtog(fs, fs->fs_csaddr + howmany(fs->fs_cssize, fs->fs_fsize)), >,
|
|
dtog(fs, fs->fs_csaddr), %jd);
|
|
/*
|
|
* With file system clustering it is possible to allocate
|
|
* many contiguous blocks. The kernel variable maxphys defines
|
|
* the maximum transfer size permitted by the controller and/or
|
|
* buffering. The fs_maxcontig parameter controls the maximum
|
|
* number of blocks that the filesystem will read or write
|
|
* in a single transfer. It is calculated when the filesystem
|
|
* is created as maxphys / fs_bsize. The loader uses a maxphys
|
|
* of 128K even when running on a system that supports larger
|
|
* values. If the filesystem was built on a system that supports
|
|
* a larger maxphys (1M is typical) it will have configured
|
|
* fs_maxcontig for that larger system. So we bound the upper
|
|
* allowable limit for fs_maxconfig to be able to at least
|
|
* work with a 1M maxphys on the smallest block size filesystem:
|
|
* 1M / 4096 == 256. There is no harm in allowing the mounting of
|
|
* filesystems that make larger than maxphys I/O requests because
|
|
* those (mostly 32-bit machines) can (very slowly) handle I/O
|
|
* requests that exceed maxphys.
|
|
*/
|
|
WCHK(fs->fs_maxcontig, <, 0, %jd);
|
|
WCHK(fs->fs_maxcontig, >, MAX(256, maxphys / fs->fs_bsize), %jd);
|
|
FCHK2(fs->fs_maxcontig, ==, 0, fs->fs_contigsumsize, !=, 0, %jd);
|
|
FCHK2(fs->fs_maxcontig, >, 1, fs->fs_contigsumsize, !=,
|
|
MIN(fs->fs_maxcontig, FS_MAXCONTIG), %jd);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Make an extensive search to find a superblock. If the superblock
|
|
* in the standard place cannot be used, try looking for one of the
|
|
* backup superblocks.
|
|
*
|
|
* Flags are made up of the following or'ed together options:
|
|
*
|
|
* UFS_NOMSG indicates that superblock inconsistency error messages
|
|
* should not be printed.
|
|
*
|
|
* UFS_NOCSUM causes only the superblock itself to be returned, but does
|
|
* not read in any auxillary data structures like the cylinder group
|
|
* summary information.
|
|
*/
|
|
int
|
|
ffs_sbsearch(void *devfd, struct fs **fsp, int reqflags,
|
|
struct malloc_type *filltype,
|
|
int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
|
|
{
|
|
struct fsrecovery *fsr;
|
|
struct fs *protofs;
|
|
void *fsrbuf;
|
|
char *cp;
|
|
long nocsum, flags, msg, cg;
|
|
off_t sblk, secsize;
|
|
int error;
|
|
|
|
msg = (reqflags & UFS_NOMSG) == 0;
|
|
nocsum = reqflags & UFS_NOCSUM;
|
|
/*
|
|
* Try normal superblock read and return it if it works.
|
|
*
|
|
* Suppress messages if it fails until we find out if
|
|
* failure can be avoided.
|
|
*/
|
|
flags = UFS_NOMSG | nocsum;
|
|
error = ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc);
|
|
/*
|
|
* If successful or endian error, no need to try further.
|
|
*/
|
|
if (error == 0 || error == EILSEQ) {
|
|
if (msg && error == EILSEQ)
|
|
printf("UFS superblock failed due to endian mismatch "
|
|
"between machine and filesystem\n");
|
|
return (error);
|
|
}
|
|
/*
|
|
* First try: ignoring hash failures.
|
|
*/
|
|
flags |= UFS_NOHASHFAIL;
|
|
if (msg)
|
|
flags &= ~UFS_NOMSG;
|
|
if (ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc) == 0)
|
|
return (0);
|
|
/*
|
|
* Next up is to check if fields of the superblock that are
|
|
* needed to find backup superblocks are usable.
|
|
*/
|
|
if (msg)
|
|
printf("Attempted recovery for standard superblock: failed\n");
|
|
flags = UFS_FSRONLY | UFS_NOHASHFAIL | UFS_NOCSUM | UFS_NOMSG;
|
|
if (ffs_sbget(devfd, &protofs, UFS_STDSB, flags, filltype,
|
|
readfunc) == 0) {
|
|
if (msg)
|
|
printf("Attempt extraction of recovery data from "
|
|
"standard superblock.\n");
|
|
} else {
|
|
/*
|
|
* Final desperation is to see if alternate superblock
|
|
* parameters have been saved in the boot area.
|
|
*/
|
|
if (msg)
|
|
printf("Attempted extraction of recovery data from "
|
|
"standard superblock: failed\nAttempt to find "
|
|
"boot zone recovery data.\n");
|
|
/*
|
|
* Look to see if recovery information has been saved.
|
|
* If so we can generate a prototype superblock based
|
|
* on that information.
|
|
*
|
|
* We need fragments-per-group, number of cylinder groups,
|
|
* location of the superblock within the cylinder group, and
|
|
* the conversion from filesystem fragments to disk blocks.
|
|
*
|
|
* When building a UFS2 filesystem, newfs(8) stores these
|
|
* details at the end of the boot block area at the start
|
|
* of the filesystem partition. If they have been overwritten
|
|
* by a boot block, we fail. But usually they are there
|
|
* and we can use them.
|
|
*
|
|
* We could ask the underlying device for its sector size,
|
|
* but some devices lie. So we just try a plausible range.
|
|
*/
|
|
error = ENOENT;
|
|
fsrbuf = NULL;
|
|
for (secsize = dbtob(1); secsize <= SBLOCKSIZE; secsize *= 2)
|
|
if ((error = (*readfunc)(devfd, (SBLOCK_UFS2 - secsize),
|
|
&fsrbuf, secsize)) == 0)
|
|
break;
|
|
if (error != 0)
|
|
goto trynowarn;
|
|
cp = fsrbuf; /* type change to keep compiler happy */
|
|
fsr = (struct fsrecovery *)&cp[secsize - sizeof *fsr];
|
|
if (fsr->fsr_magic != FS_UFS2_MAGIC ||
|
|
(protofs = UFS_MALLOC(SBLOCKSIZE, filltype, M_NOWAIT))
|
|
== NULL) {
|
|
UFS_FREE(fsrbuf, filltype);
|
|
goto trynowarn;
|
|
}
|
|
memset(protofs, 0, sizeof(struct fs));
|
|
protofs->fs_fpg = fsr->fsr_fpg;
|
|
protofs->fs_fsbtodb = fsr->fsr_fsbtodb;
|
|
protofs->fs_sblkno = fsr->fsr_sblkno;
|
|
protofs->fs_magic = fsr->fsr_magic;
|
|
protofs->fs_ncg = fsr->fsr_ncg;
|
|
UFS_FREE(fsrbuf, filltype);
|
|
}
|
|
/*
|
|
* Scan looking for alternative superblocks.
|
|
*/
|
|
flags = nocsum;
|
|
if (!msg)
|
|
flags |= UFS_NOMSG;
|
|
for (cg = 0; cg < protofs->fs_ncg; cg++) {
|
|
sblk = fsbtodb(protofs, cgsblock(protofs, cg));
|
|
if (msg)
|
|
printf("Try cg %ld at sblock loc %jd\n", cg,
|
|
(intmax_t)sblk);
|
|
if (ffs_sbget(devfd, fsp, dbtob(sblk), flags, filltype,
|
|
readfunc) == 0) {
|
|
if (msg)
|
|
printf("Succeeded with alternate superblock "
|
|
"at %jd\n", (intmax_t)sblk);
|
|
UFS_FREE(protofs, filltype);
|
|
return (0);
|
|
}
|
|
}
|
|
UFS_FREE(protofs, filltype);
|
|
/*
|
|
* Our alternate superblock strategies failed. Our last ditch effort
|
|
* is to see if the standard superblock has only non-critical errors.
|
|
*/
|
|
trynowarn:
|
|
flags = UFS_NOWARNFAIL | UFS_NOMSG | nocsum;
|
|
if (msg) {
|
|
printf("Finding an alternate superblock failed.\nCheck for "
|
|
"only non-critical errors in standard superblock\n");
|
|
flags &= ~UFS_NOMSG;
|
|
}
|
|
if (ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc) != 0) {
|
|
if (msg)
|
|
printf("Failed, superblock has critical errors\n");
|
|
return (ENOENT);
|
|
}
|
|
if (msg)
|
|
printf("Success, using standard superblock with "
|
|
"non-critical errors.\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write a superblock to the devfd device from the memory pointed to by fs.
|
|
* Write out the superblock summary information if it is present.
|
|
*
|
|
* If the write is successful, zero is returned. Otherwise one of the
|
|
* following error values is returned:
|
|
* EIO: failed to write superblock.
|
|
* EIO: failed to write superblock summary information.
|
|
*/
|
|
int
|
|
ffs_sbput(void *devfd, struct fs *fs, off_t loc,
|
|
int (*writefunc)(void *devfd, off_t loc, void *buf, int size))
|
|
{
|
|
int i, error, blks, size;
|
|
uint8_t *space;
|
|
|
|
/*
|
|
* If there is summary information, write it first, so if there
|
|
* is an error, the superblock will not be marked as clean.
|
|
*/
|
|
if (fs->fs_si != NULL && fs->fs_csp != NULL) {
|
|
blks = howmany(fs->fs_cssize, fs->fs_fsize);
|
|
space = (uint8_t *)fs->fs_csp;
|
|
for (i = 0; i < blks; i += fs->fs_frag) {
|
|
size = fs->fs_bsize;
|
|
if (i + fs->fs_frag > blks)
|
|
size = (blks - i) * fs->fs_fsize;
|
|
if ((error = (*writefunc)(devfd,
|
|
dbtob(fsbtodb(fs, fs->fs_csaddr + i)),
|
|
space, size)) != 0)
|
|
return (error);
|
|
space += size;
|
|
}
|
|
}
|
|
fs->fs_fmod = 0;
|
|
#ifndef _KERNEL
|
|
{
|
|
struct fs_summary_info *fs_si;
|
|
|
|
fs->fs_time = time(NULL);
|
|
/* Clear the pointers for the duration of writing. */
|
|
fs_si = fs->fs_si;
|
|
fs->fs_si = NULL;
|
|
fs->fs_ckhash = ffs_calc_sbhash(fs);
|
|
error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize);
|
|
fs->fs_si = fs_si;
|
|
}
|
|
#else /* _KERNEL */
|
|
fs->fs_time = time_second;
|
|
fs->fs_ckhash = ffs_calc_sbhash(fs);
|
|
error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize);
|
|
#endif /* _KERNEL */
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Calculate the check-hash for a superblock.
|
|
*/
|
|
uint32_t
|
|
ffs_calc_sbhash(struct fs *fs)
|
|
{
|
|
uint32_t ckhash, save_ckhash;
|
|
|
|
/*
|
|
* A filesystem that was using a superblock ckhash may be moved
|
|
* to an older kernel that does not support ckhashes. The
|
|
* older kernel will clear the FS_METACKHASH flag indicating
|
|
* that it does not update hashes. When the disk is moved back
|
|
* to a kernel capable of ckhashes it disables them on mount:
|
|
*
|
|
* if ((fs->fs_flags & FS_METACKHASH) == 0)
|
|
* fs->fs_metackhash = 0;
|
|
*
|
|
* This leaves (fs->fs_metackhash & CK_SUPERBLOCK) == 0) with an
|
|
* old stale value in the fs->fs_ckhash field. Thus the need to
|
|
* just accept what is there.
|
|
*/
|
|
if ((fs->fs_metackhash & CK_SUPERBLOCK) == 0)
|
|
return (fs->fs_ckhash);
|
|
|
|
save_ckhash = fs->fs_ckhash;
|
|
fs->fs_ckhash = 0;
|
|
/*
|
|
* If newly read from disk, the caller is responsible for
|
|
* verifying that fs->fs_sbsize <= SBLOCKSIZE.
|
|
*/
|
|
ckhash = calculate_crc32c(~0L, (void *)fs, fs->fs_sbsize);
|
|
fs->fs_ckhash = save_ckhash;
|
|
return (ckhash);
|
|
}
|
|
|
|
/*
|
|
* Update the frsum fields to reflect addition or deletion
|
|
* of some frags.
|
|
*/
|
|
void
|
|
ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt)
|
|
{
|
|
int inblk;
|
|
int field, subfield;
|
|
int siz, pos;
|
|
|
|
inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
|
|
fragmap <<= 1;
|
|
for (siz = 1; siz < fs->fs_frag; siz++) {
|
|
if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
|
|
continue;
|
|
field = around[siz];
|
|
subfield = inside[siz];
|
|
for (pos = siz; pos <= fs->fs_frag; pos++) {
|
|
if ((fragmap & field) == subfield) {
|
|
fraglist[siz] += cnt;
|
|
pos += siz;
|
|
field <<= siz;
|
|
subfield <<= siz;
|
|
}
|
|
field <<= 1;
|
|
subfield <<= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* block operations
|
|
*
|
|
* check if a block is available
|
|
*/
|
|
int
|
|
ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
|
|
{
|
|
unsigned char mask;
|
|
|
|
switch ((int)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:
|
|
#ifdef _KERNEL
|
|
panic("ffs_isblock");
|
|
#endif
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* check if a block is free
|
|
*/
|
|
int
|
|
ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
|
|
{
|
|
|
|
switch ((int)fs->fs_frag) {
|
|
case 8:
|
|
return (cp[h] == 0);
|
|
case 4:
|
|
return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
|
|
case 2:
|
|
return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
|
|
case 1:
|
|
return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
|
|
default:
|
|
#ifdef _KERNEL
|
|
panic("ffs_isfreeblock");
|
|
#endif
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* take a block out of the map
|
|
*/
|
|
void
|
|
ffs_clrblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
|
|
{
|
|
|
|
switch ((int)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:
|
|
#ifdef _KERNEL
|
|
panic("ffs_clrblock");
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* put a block into the map
|
|
*/
|
|
void
|
|
ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
|
|
{
|
|
|
|
switch ((int)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:
|
|
#ifdef _KERNEL
|
|
panic("ffs_setblock");
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update the cluster map because of an allocation or free.
|
|
*
|
|
* Cnt == 1 means free; cnt == -1 means allocating.
|
|
*/
|
|
void
|
|
ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt)
|
|
{
|
|
int32_t *sump;
|
|
int32_t *lp;
|
|
u_char *freemapp, *mapp;
|
|
int i, start, end, forw, back, map;
|
|
u_int bit;
|
|
|
|
if (fs->fs_contigsumsize <= 0)
|
|
return;
|
|
freemapp = cg_clustersfree(cgp);
|
|
sump = cg_clustersum(cgp);
|
|
/*
|
|
* Allocate or clear the actual block.
|
|
*/
|
|
if (cnt > 0)
|
|
setbit(freemapp, blkno);
|
|
else
|
|
clrbit(freemapp, blkno);
|
|
/*
|
|
* Find the size of the cluster going forward.
|
|
*/
|
|
start = blkno + 1;
|
|
end = start + fs->fs_contigsumsize;
|
|
if (end >= cgp->cg_nclusterblks)
|
|
end = cgp->cg_nclusterblks;
|
|
mapp = &freemapp[start / NBBY];
|
|
map = *mapp++;
|
|
bit = 1U << (start % NBBY);
|
|
for (i = start; i < end; i++) {
|
|
if ((map & bit) == 0)
|
|
break;
|
|
if ((i & (NBBY - 1)) != (NBBY - 1)) {
|
|
bit <<= 1;
|
|
} else {
|
|
map = *mapp++;
|
|
bit = 1;
|
|
}
|
|
}
|
|
forw = i - start;
|
|
/*
|
|
* Find the size of the cluster going backward.
|
|
*/
|
|
start = blkno - 1;
|
|
end = start - fs->fs_contigsumsize;
|
|
if (end < 0)
|
|
end = -1;
|
|
mapp = &freemapp[start / NBBY];
|
|
map = *mapp--;
|
|
bit = 1U << (start % NBBY);
|
|
for (i = start; i > end; i--) {
|
|
if ((map & bit) == 0)
|
|
break;
|
|
if ((i & (NBBY - 1)) != 0) {
|
|
bit >>= 1;
|
|
} else {
|
|
map = *mapp--;
|
|
bit = 1U << (NBBY - 1);
|
|
}
|
|
}
|
|
back = start - i;
|
|
/*
|
|
* Account for old cluster and the possibly new forward and
|
|
* back clusters.
|
|
*/
|
|
i = back + forw + 1;
|
|
if (i > fs->fs_contigsumsize)
|
|
i = fs->fs_contigsumsize;
|
|
sump[i] += cnt;
|
|
if (back > 0)
|
|
sump[back] -= cnt;
|
|
if (forw > 0)
|
|
sump[forw] -= cnt;
|
|
/*
|
|
* Update cluster summary information.
|
|
*/
|
|
lp = &sump[fs->fs_contigsumsize];
|
|
for (i = fs->fs_contigsumsize; i > 0; i--)
|
|
if (*lp-- > 0)
|
|
break;
|
|
fs->fs_maxcluster[cgp->cg_cgx] = i;
|
|
}
|