mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
305 lines
8.2 KiB
C
305 lines
8.2 KiB
C
/*-
|
|
* Copyright (c) 2002 McAfee, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed for the FreeBSD Project by Marshall
|
|
* Kirk McKusick and McAfee Research,, the Security Research Division of
|
|
* McAfee, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as
|
|
* part of the DARPA CHATS research program
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
/*-
|
|
* Copyright (c) 1998 Robert Nordier
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are freely
|
|
* permitted provided that the above copyright notice and this
|
|
* paragraph and the following disclaimer are duplicated in all
|
|
* such forms.
|
|
*
|
|
* This software is provided "AS IS" and without any express or
|
|
* implied warranties, including, without limitation, the implied
|
|
* warranties of merchantability and fitness for a particular
|
|
* purpose.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <ufs/ufs/dinode.h>
|
|
#include <ufs/ufs/dir.h>
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
#ifdef UFS_SMALL_CGBASE
|
|
/* XXX: Revert to old (broken for over 1.5Tb filesystems) version of cgbase
|
|
(see sys/ufs/ffs/fs.h rev 1.39) so that small boot loaders (e.g. boot2) can
|
|
support both UFS1 and UFS2. */
|
|
#undef cgbase
|
|
#define cgbase(fs, c) ((ufs2_daddr_t)((fs)->fs_fpg * (c)))
|
|
#endif
|
|
|
|
typedef uint32_t ufs_ino_t;
|
|
|
|
/*
|
|
* We use 4k `virtual' blocks for filesystem data, whatever the actual
|
|
* filesystem block size. FFS blocks are always a multiple of 4k.
|
|
*/
|
|
#define VBLKSHIFT 12
|
|
#define VBLKSIZE (1 << VBLKSHIFT)
|
|
#define VBLKMASK (VBLKSIZE - 1)
|
|
#define DBPERVBLK (VBLKSIZE / DEV_BSIZE)
|
|
#define INDIRPERVBLK(fs) (NINDIR(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
|
|
#define IPERVBLK(fs) (INOPB(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
|
|
#define INO_TO_VBA(fs, ipervblk, x) \
|
|
(fsbtodb(fs, cgimin(fs, ino_to_cg(fs, x))) + \
|
|
(((x) % (fs)->fs_ipg) / (ipervblk) * DBPERVBLK))
|
|
#define INO_TO_VBO(ipervblk, x) ((x) % ipervblk)
|
|
#define FS_TO_VBA(fs, fsb, off) (fsbtodb(fs, fsb) + \
|
|
((off) / VBLKSIZE) * DBPERVBLK)
|
|
#define FS_TO_VBO(fs, fsb, off) ((off) & VBLKMASK)
|
|
|
|
/* Buffers that must not span a 64k boundary. */
|
|
struct dmadat {
|
|
char blkbuf[VBLKSIZE]; /* filesystem blocks */
|
|
char indbuf[VBLKSIZE]; /* indir blocks */
|
|
char sbbuf[SBLOCKSIZE]; /* superblock */
|
|
char secbuf[DEV_BSIZE]; /* for MBR/disklabel */
|
|
};
|
|
static struct dmadat *dmadat;
|
|
|
|
static ufs_ino_t lookup(const char *);
|
|
static ssize_t fsread(ufs_ino_t, void *, size_t);
|
|
|
|
static uint8_t ls, dsk_meta;
|
|
static uint32_t fs_off;
|
|
|
|
static __inline uint8_t
|
|
fsfind(const char *name, ufs_ino_t * ino)
|
|
{
|
|
static char buf[DEV_BSIZE];
|
|
struct direct *d;
|
|
char *s;
|
|
ssize_t n;
|
|
|
|
fs_off = 0;
|
|
while ((n = fsread(*ino, buf, DEV_BSIZE)) > 0)
|
|
for (s = buf; s < buf + DEV_BSIZE;) {
|
|
d = (void *)s;
|
|
if (ls)
|
|
printf("%s ", d->d_name);
|
|
else if (!strcmp(name, d->d_name)) {
|
|
*ino = d->d_ino;
|
|
return d->d_type;
|
|
}
|
|
s += d->d_reclen;
|
|
}
|
|
if (n != -1 && ls)
|
|
printf("\n");
|
|
return 0;
|
|
}
|
|
|
|
static ufs_ino_t
|
|
lookup(const char *path)
|
|
{
|
|
static char name[MAXNAMLEN + 1];
|
|
const char *s;
|
|
ufs_ino_t ino;
|
|
ssize_t n;
|
|
uint8_t dt;
|
|
|
|
ino = ROOTINO;
|
|
dt = DT_DIR;
|
|
for (;;) {
|
|
if (*path == '/')
|
|
path++;
|
|
if (!*path)
|
|
break;
|
|
for (s = path; *s && *s != '/'; s++);
|
|
if ((n = s - path) > MAXNAMLEN)
|
|
return 0;
|
|
ls = *path == '?' && n == 1 && !*s;
|
|
memcpy(name, path, n);
|
|
name[n] = 0;
|
|
if (dt != DT_DIR) {
|
|
printf("%s: not a directory.\n", name);
|
|
return (0);
|
|
}
|
|
if ((dt = fsfind(name, &ino)) <= 0)
|
|
break;
|
|
path = s;
|
|
}
|
|
return dt == DT_REG ? ino : 0;
|
|
}
|
|
|
|
/*
|
|
* Possible superblock locations ordered from most to least likely.
|
|
*/
|
|
static int sblock_try[] = SBLOCKSEARCH;
|
|
|
|
#if defined(UFS2_ONLY)
|
|
#define DIP(field) dp2.field
|
|
#elif defined(UFS1_ONLY)
|
|
#define DIP(field) dp1.field
|
|
#else
|
|
#define DIP(field) fs.fs_magic == FS_UFS1_MAGIC ? dp1.field : dp2.field
|
|
#endif
|
|
|
|
static ssize_t
|
|
fsread(ufs_ino_t inode, void *buf, size_t nbyte)
|
|
{
|
|
#ifndef UFS2_ONLY
|
|
static struct ufs1_dinode dp1;
|
|
ufs1_daddr_t addr1;
|
|
#endif
|
|
#ifndef UFS1_ONLY
|
|
static struct ufs2_dinode dp2;
|
|
#endif
|
|
static struct fs fs;
|
|
static ufs_ino_t inomap;
|
|
char *blkbuf;
|
|
void *indbuf;
|
|
char *s;
|
|
size_t n, nb, size, off, vboff;
|
|
ufs_lbn_t lbn;
|
|
ufs2_daddr_t addr2, vbaddr;
|
|
static ufs2_daddr_t blkmap, indmap;
|
|
u_int u;
|
|
|
|
blkbuf = dmadat->blkbuf;
|
|
indbuf = dmadat->indbuf;
|
|
if (!dsk_meta) {
|
|
inomap = 0;
|
|
for (n = 0; sblock_try[n] != -1; n++) {
|
|
if (dskread(dmadat->sbbuf, sblock_try[n] / DEV_BSIZE,
|
|
SBLOCKSIZE / DEV_BSIZE))
|
|
return -1;
|
|
memcpy(&fs, dmadat->sbbuf, sizeof(struct fs));
|
|
if ((
|
|
#if defined(UFS1_ONLY)
|
|
fs.fs_magic == FS_UFS1_MAGIC
|
|
#elif defined(UFS2_ONLY)
|
|
(fs.fs_magic == FS_UFS2_MAGIC &&
|
|
fs.fs_sblockloc == sblock_try[n])
|
|
#else
|
|
fs.fs_magic == FS_UFS1_MAGIC ||
|
|
(fs.fs_magic == FS_UFS2_MAGIC &&
|
|
fs.fs_sblockloc == sblock_try[n])
|
|
#endif
|
|
) &&
|
|
fs.fs_bsize <= MAXBSIZE &&
|
|
fs.fs_bsize >= sizeof(struct fs))
|
|
break;
|
|
}
|
|
if (sblock_try[n] == -1) {
|
|
printf("Not ufs\n");
|
|
return -1;
|
|
}
|
|
dsk_meta++;
|
|
} else
|
|
memcpy(&fs, dmadat->sbbuf, sizeof(struct fs));
|
|
if (!inode)
|
|
return 0;
|
|
if (inomap != inode) {
|
|
n = IPERVBLK(&fs);
|
|
if (dskread(blkbuf, INO_TO_VBA(&fs, n, inode), DBPERVBLK))
|
|
return -1;
|
|
n = INO_TO_VBO(n, inode);
|
|
#if defined(UFS1_ONLY)
|
|
memcpy(&dp1, (struct ufs1_dinode *)blkbuf + n,
|
|
sizeof(struct ufs1_dinode));
|
|
#elif defined(UFS2_ONLY)
|
|
memcpy(&dp2, (struct ufs2_dinode *)blkbuf + n,
|
|
sizeof(struct ufs2_dinode));
|
|
#else
|
|
if (fs.fs_magic == FS_UFS1_MAGIC)
|
|
memcpy(&dp1, (struct ufs1_dinode *)blkbuf + n,
|
|
sizeof(struct ufs1_dinode));
|
|
else
|
|
memcpy(&dp2, (struct ufs2_dinode *)blkbuf + n,
|
|
sizeof(struct ufs2_dinode));
|
|
#endif
|
|
inomap = inode;
|
|
fs_off = 0;
|
|
blkmap = indmap = 0;
|
|
}
|
|
s = buf;
|
|
size = DIP(di_size);
|
|
n = size - fs_off;
|
|
if (nbyte > n)
|
|
nbyte = n;
|
|
nb = nbyte;
|
|
while (nb) {
|
|
lbn = lblkno(&fs, fs_off);
|
|
off = blkoff(&fs, fs_off);
|
|
if (lbn < NDADDR) {
|
|
addr2 = DIP(di_db[lbn]);
|
|
} else if (lbn < NDADDR + NINDIR(&fs)) {
|
|
n = INDIRPERVBLK(&fs);
|
|
addr2 = DIP(di_ib[0]);
|
|
u = (u_int)(lbn - NDADDR) / n * DBPERVBLK;
|
|
vbaddr = fsbtodb(&fs, addr2) + u;
|
|
if (indmap != vbaddr) {
|
|
if (dskread(indbuf, vbaddr, DBPERVBLK))
|
|
return -1;
|
|
indmap = vbaddr;
|
|
}
|
|
n = (lbn - NDADDR) & (n - 1);
|
|
#if defined(UFS1_ONLY)
|
|
memcpy(&addr1, (ufs1_daddr_t *)indbuf + n,
|
|
sizeof(ufs1_daddr_t));
|
|
addr2 = addr1;
|
|
#elif defined(UFS2_ONLY)
|
|
memcpy(&addr2, (ufs2_daddr_t *)indbuf + n,
|
|
sizeof(ufs2_daddr_t));
|
|
#else
|
|
if (fs.fs_magic == FS_UFS1_MAGIC) {
|
|
memcpy(&addr1, (ufs1_daddr_t *)indbuf + n,
|
|
sizeof(ufs1_daddr_t));
|
|
addr2 = addr1;
|
|
} else
|
|
memcpy(&addr2, (ufs2_daddr_t *)indbuf + n,
|
|
sizeof(ufs2_daddr_t));
|
|
#endif
|
|
} else
|
|
return -1;
|
|
vbaddr = fsbtodb(&fs, addr2) + (off >> VBLKSHIFT) * DBPERVBLK;
|
|
vboff = off & VBLKMASK;
|
|
n = sblksize(&fs, size, lbn) - (off & ~VBLKMASK);
|
|
if (n > VBLKSIZE)
|
|
n = VBLKSIZE;
|
|
if (blkmap != vbaddr) {
|
|
if (dskread(blkbuf, vbaddr, n >> DEV_BSHIFT))
|
|
return -1;
|
|
blkmap = vbaddr;
|
|
}
|
|
n -= vboff;
|
|
if (n > nb)
|
|
n = nb;
|
|
memcpy(s, blkbuf + vboff, n);
|
|
s += n;
|
|
fs_off += n;
|
|
nb -= n;
|
|
}
|
|
return nbyte;
|
|
}
|