272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*-
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Marshall
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* Kirk McKusick and Network Associates Laboratories, the Security
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* Research Division of Network Associates, Inc. under DARPA/SPAWAR
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* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
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* research program
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*
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* Copyright (c) 1998 Robert Nordier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#ifdef __i386__
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/* XXX: Revert to old (broken for over 1.5Tb filesystems) version of cgbase
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(see sys/ufs/ffs/fs.h rev 1.39) so that i386 boot loader (boot2) can
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support both UFS1 and UFS2 again. */
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#undef cgbase
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#define cgbase(fs, c) ((ufs2_daddr_t)((fs)->fs_fpg * (c)))
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#endif
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/*
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* We use 4k `virtual' blocks for filesystem data, whatever the actual
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* filesystem block size. FFS blocks are always a multiple of 4k.
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*/
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#define VBLKSHIFT 12
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#define VBLKSIZE (1 << VBLKSHIFT)
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#define VBLKMASK (VBLKSIZE - 1)
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#define DBPERVBLK (VBLKSIZE / DEV_BSIZE)
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#define INDIRPERVBLK(fs) (NINDIR(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
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#define IPERVBLK(fs) (INOPB(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
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#define INO_TO_VBA(fs, ipervblk, x) \
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(fsbtodb(fs, cgimin(fs, ino_to_cg(fs, x))) + \
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(((x) % (fs)->fs_ipg) / (ipervblk) * DBPERVBLK))
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#define INO_TO_VBO(ipervblk, x) ((x) % ipervblk)
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#define FS_TO_VBA(fs, fsb, off) (fsbtodb(fs, fsb) + \
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((off) / VBLKSIZE) * DBPERVBLK)
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#define FS_TO_VBO(fs, fsb, off) ((off) & VBLKMASK)
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/* Buffers that must not span a 64k boundary. */
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struct dmadat {
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char blkbuf[VBLKSIZE]; /* filesystem blocks */
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char indbuf[VBLKSIZE]; /* indir blocks */
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char sbbuf[SBLOCKSIZE]; /* superblock */
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char secbuf[DEV_BSIZE]; /* for MBR/disklabel */
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};
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static struct dmadat *dmadat;
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static ino_t lookup(const char *);
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static ssize_t fsread(ino_t, void *, size_t);
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static int ls, dsk_meta;
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static uint32_t fs_off;
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static __inline__ int
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fsfind(const char *name, ino_t * ino)
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{
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char buf[DEV_BSIZE];
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struct dirent *d;
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char *s;
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ssize_t n;
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fs_off = 0;
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while ((n = fsread(*ino, buf, DEV_BSIZE)) > 0)
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for (s = buf; s < buf + DEV_BSIZE;) {
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d = (void *)s;
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if (ls)
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printf("%s ", d->d_name);
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else if (!strcmp(name, d->d_name)) {
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*ino = d->d_fileno;
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return d->d_type;
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}
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s += d->d_reclen;
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}
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if (n != -1 && ls)
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printf("\n");
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return 0;
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}
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static ino_t
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lookup(const char *path)
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{
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char name[MAXNAMLEN + 1];
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const char *s;
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ino_t ino;
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ssize_t n;
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int dt;
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ino = ROOTINO;
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dt = DT_DIR;
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name[0] = '/';
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name[1] = '\0';
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for (;;) {
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if (*path == '/')
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path++;
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if (!*path)
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break;
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for (s = path; *s && *s != '/'; s++);
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if ((n = s - path) > MAXNAMLEN)
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return 0;
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ls = *path == '?' && n == 1 && !*s;
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memcpy(name, path, n);
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name[n] = 0;
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if (dt != DT_DIR) {
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printf("%s: not a directory.\n", name);
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return (0);
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}
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if ((dt = fsfind(name, &ino)) <= 0)
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break;
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path = s;
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}
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return dt == DT_REG ? ino : 0;
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}
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/*
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* Possible superblock locations ordered from most to least likely.
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*/
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static int sblock_try[] = SBLOCKSEARCH;
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#if defined(UFS2_ONLY)
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#define DIP(field) dp2.field
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#elif defined(UFS1_ONLY)
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#define DIP(field) dp1.field
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#else
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#define DIP(field) fs->fs_magic == FS_UFS1_MAGIC ? dp1.field : dp2.field
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#endif
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static ssize_t
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fsread(ino_t inode, void *buf, size_t nbyte)
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{
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#ifndef UFS2_ONLY
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static struct ufs1_dinode dp1;
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#endif
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#ifndef UFS1_ONLY
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static struct ufs2_dinode dp2;
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#endif
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static ino_t inomap;
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char *blkbuf;
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void *indbuf;
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struct fs *fs;
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char *s;
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size_t n, nb, size, off, vboff;
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ufs_lbn_t lbn;
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ufs2_daddr_t addr, vbaddr;
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static ufs2_daddr_t blkmap, indmap;
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u_int u;
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blkbuf = dmadat->blkbuf;
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indbuf = dmadat->indbuf;
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fs = (struct fs *)dmadat->sbbuf;
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if (!dsk_meta) {
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inomap = 0;
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for (n = 0; sblock_try[n] != -1; n++) {
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if (dskread(fs, sblock_try[n] / DEV_BSIZE,
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SBLOCKSIZE / DEV_BSIZE))
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return -1;
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if ((
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#if defined(UFS1_ONLY)
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fs->fs_magic == FS_UFS1_MAGIC
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#elif defined(UFS2_ONLY)
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(fs->fs_magic == FS_UFS2_MAGIC &&
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fs->fs_sblockloc == sblock_try[n])
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#else
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fs->fs_magic == FS_UFS1_MAGIC ||
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(fs->fs_magic == FS_UFS2_MAGIC &&
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fs->fs_sblockloc == sblock_try[n])
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#endif
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) &&
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fs->fs_bsize <= MAXBSIZE &&
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fs->fs_bsize >= sizeof(struct fs))
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break;
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}
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if (sblock_try[n] == -1) {
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printf("Not ufs\n");
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return -1;
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}
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dsk_meta++;
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}
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if (!inode)
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return 0;
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if (inomap != inode) {
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n = IPERVBLK(fs);
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if (dskread(blkbuf, INO_TO_VBA(fs, n, inode), DBPERVBLK))
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return -1;
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n = INO_TO_VBO(n, inode);
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#if defined(UFS1_ONLY)
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dp1 = ((struct ufs1_dinode *)blkbuf)[n];
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#elif defined(UFS2_ONLY)
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dp2 = ((struct ufs2_dinode *)blkbuf)[n];
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#else
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if (fs->fs_magic == FS_UFS1_MAGIC)
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dp1 = ((struct ufs1_dinode *)blkbuf)[n];
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else
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dp2 = ((struct ufs2_dinode *)blkbuf)[n];
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#endif
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inomap = inode;
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fs_off = 0;
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blkmap = indmap = 0;
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}
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s = buf;
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size = DIP(di_size);
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n = size - fs_off;
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if (nbyte > n)
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nbyte = n;
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nb = nbyte;
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while (nb) {
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lbn = lblkno(fs, fs_off);
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off = blkoff(fs, fs_off);
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if (lbn < NDADDR) {
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addr = DIP(di_db[lbn]);
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} else if (lbn < NDADDR + NINDIR(fs)) {
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n = INDIRPERVBLK(fs);
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addr = DIP(di_ib[0]);
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u = (u_int)(lbn - NDADDR) / (n * DBPERVBLK);
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vbaddr = fsbtodb(fs, addr) + u;
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if (indmap != vbaddr) {
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if (dskread(indbuf, vbaddr, DBPERVBLK))
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return -1;
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indmap = vbaddr;
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}
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n = (lbn - NDADDR) & (n - 1);
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#if defined(UFS1_ONLY)
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addr = ((ufs1_daddr_t *)indbuf)[n];
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#elif defined(UFS2_ONLY)
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addr = ((ufs2_daddr_t *)indbuf)[n];
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#else
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if (fs->fs_magic == FS_UFS1_MAGIC)
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addr = ((ufs1_daddr_t *)indbuf)[n];
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else
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addr = ((ufs2_daddr_t *)indbuf)[n];
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#endif
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} else {
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return -1;
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}
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vbaddr = fsbtodb(fs, addr) + (off >> VBLKSHIFT) * DBPERVBLK;
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vboff = off & VBLKMASK;
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n = sblksize(fs, size, lbn) - (off & ~VBLKMASK);
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if (n > VBLKSIZE)
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n = VBLKSIZE;
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if (blkmap != vbaddr) {
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if (dskread(blkbuf, vbaddr, n >> DEV_BSHIFT))
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return -1;
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blkmap = vbaddr;
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}
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n -= vboff;
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if (n > nb)
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n = nb;
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memcpy(s, blkbuf + vboff, n);
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s += n;
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fs_off += n;
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nb -= n;
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}
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return nbyte;
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}
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