2 * Copyright (c) 2002 Networks Associates Technology, Inc.
5 * This software was developed for the FreeBSD Project by Marshall
6 * Kirk McKusick and Network Associates Laboratories, the Security
7 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
8 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
11 * Copyright (c) 1998 Robert Nordier
12 * All rights reserved.
14 * Redistribution and use in source and binary forms are freely
15 * permitted provided that the above copyright notice and this
16 * paragraph and the following disclaimer are duplicated in all
19 * This software is provided "AS IS" and without any express or
20 * implied warranties, including, without limitation, the implied
21 * warranties of merchantability and fitness for a particular
24 * $FreeBSD: src/sys/boot/common/ufsread.c,v 1.12 2003/08/25 23:30:41 obrien Exp $
25 * $DragonFly: src/sys/boot/common/ufsread.c,v 1.5 2008/09/13 11:46:28 corecode Exp $
28 #include <vfs/ufs/dir.h>
32 /* XXX: Revert to old (broken for over 1.5Tb filesystems) version of cgbase
33 (see sys/ufs/ffs/fs.h rev 1.39) so that i386 boot loader (boot2) can
34 support both UFS1 and UFS2 again. */
36 #define cgbase(fs, c) ((ufs2_daddr_t)((fs)->fs_fpg * (c)))
40 * We use 4k `virtual' blocks for filesystem data, whatever the actual
41 * filesystem block size. FFS blocks are always a multiple of 4k.
44 #define VBLKSIZE (1 << VBLKSHIFT)
45 #define VBLKMASK (VBLKSIZE - 1)
46 #define DBPERVBLK (VBLKSIZE / DEV_BSIZE)
47 #define INDIRPERVBLK(fs) (NINDIR(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
48 #define IPERVBLK(fs) (INOPB(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
49 #define INO_TO_VBA(fs, ipervblk, x) \
50 (fsbtodb(fs, cgimin(fs, ino_to_cg(fs, x))) + \
51 (((x) % (fs)->fs_ipg) / (ipervblk) * DBPERVBLK))
52 #define INO_TO_VBO(ipervblk, x) ((x) % ipervblk)
53 #define FS_TO_VBA(fs, fsb, off) (fsbtodb(fs, fsb) + \
54 ((off) / VBLKSIZE) * DBPERVBLK)
55 #define FS_TO_VBO(fs, fsb, off) ((off) & VBLKMASK)
57 /* Buffers that must not span a 64k boundary. */
59 char blkbuf[VBLKSIZE]; /* filesystem blocks */
60 char indbuf[VBLKSIZE]; /* indir blocks */
61 char sbbuf[SBLOCKSIZE]; /* superblock */
62 char secbuf[DEV_BSIZE]; /* for MBR/disklabel */
64 static struct dmadat *dmadat;
66 static ino_t lookup(const char *);
67 static ssize_t fsread(ino_t, void *, size_t);
70 fsfind(const char *name, ino_t * ino)
78 while ((n = fsread(*ino, buf, DEV_BSIZE)) > 0)
79 for (s = buf; s < buf + DEV_BSIZE;) {
82 printf("%s ", d->d_name);
83 else if (!strcmp(name, d->d_name)) {
95 lookup(const char *path)
97 char name[MAXNAMLEN + 1];
112 for (s = path; *s && *s != '/'; s++);
113 if ((n = s - path) > MAXNAMLEN)
115 ls = *path == '?' && n == 1 && !*s;
116 memcpy(name, path, n);
119 printf("%s: not a directory.\n", name);
122 if ((dt = fsfind(name, &ino)) <= 0)
126 return dt == DT_REG ? ino : 0;
130 * Possible superblock locations ordered from most to least likely.
132 static int sblock_try[] = SBLOCKSEARCH;
134 #if defined(UFS2_ONLY)
135 #define DIP(field) dp2.field
136 #elif defined(UFS1_ONLY)
137 #define DIP(field) dp1.field
139 #define DIP(field) fs->fs_magic == FS_UFS1_MAGIC ? dp1.field : dp2.field
143 fsread(ino_t inode, void *buf, size_t nbyte)
146 static struct ufs1_dinode dp1;
149 static struct ufs2_dinode dp2;
156 size_t n, nb, size, off, vboff;
158 ufs2_daddr_t addr, vbaddr;
159 static ufs2_daddr_t blkmap, indmap;
163 blkbuf = dmadat->blkbuf;
164 indbuf = dmadat->indbuf;
165 fs = (struct fs *)dmadat->sbbuf;
168 for (n = 0; sblock_try[n] != -1; n++) {
169 if (dskread(fs, sblock_try[n] / DEV_BSIZE,
170 SBLOCKSIZE / DEV_BSIZE))
173 #if defined(UFS1_ONLY)
174 fs->fs_magic == FS_UFS1_MAGIC
175 #elif defined(UFS2_ONLY)
176 (fs->fs_magic == FS_UFS2_MAGIC &&
177 fs->fs_sblockloc == sblock_try[n])
179 fs->fs_magic == FS_UFS1_MAGIC ||
180 (fs->fs_magic == FS_UFS2_MAGIC &&
181 fs->fs_sblockloc == sblock_try[n])
184 fs->fs_bsize <= MAXBSIZE &&
185 fs->fs_bsize >= sizeof(struct fs))
188 if (sblock_try[n] == -1) {
196 if (inomap != inode) {
198 if (dskread(blkbuf, INO_TO_VBA(fs, n, inode), DBPERVBLK))
200 n = INO_TO_VBO(n, inode);
201 #if defined(UFS1_ONLY)
202 dp1 = ((struct ufs1_dinode *)blkbuf)[n];
203 #elif defined(UFS2_ONLY)
204 dp2 = ((struct ufs2_dinode *)blkbuf)[n];
206 if (fs->fs_magic == FS_UFS1_MAGIC)
207 dp1 = ((struct ufs1_dinode *)blkbuf)[n];
209 dp2 = ((struct ufs2_dinode *)blkbuf)[n];
222 lbn = lblkno(fs, fs_off);
223 off = blkoff(fs, fs_off);
225 addr = DIP(di_db[lbn]);
226 } else if (lbn < NDADDR + NINDIR(fs)) {
227 n = INDIRPERVBLK(fs);
228 addr = DIP(di_ib[0]);
229 u = (u_int)(lbn - NDADDR) / n * DBPERVBLK;
230 vbaddr = fsbtodb(fs, addr) + u;
231 if (indmap != vbaddr) {
232 if (dskread(indbuf, vbaddr, DBPERVBLK))
236 n = (lbn - NDADDR) & (n - 1);
237 #if defined(UFS1_ONLY)
238 addr = ((ufs1_daddr_t *)indbuf)[n];
239 #elif defined(UFS2_ONLY)
240 addr = ((ufs2_daddr_t *)indbuf)[n];
242 if (fs->fs_magic == FS_UFS1_MAGIC)
243 addr = ((ufs1_daddr_t *)indbuf)[n];
245 addr = ((ufs2_daddr_t *)indbuf)[n];
250 vbaddr = fsbtodb(fs, addr) + (off >> VBLKSHIFT) * DBPERVBLK;
251 vboff = off & VBLKMASK;
252 n = sblksize(fs, size, lbn) - (off & ~VBLKMASK);
255 if (blkmap != vbaddr) {
256 if (dskread(blkbuf, vbaddr, n >> DEV_BSHIFT))
263 memcpy(s, blkbuf + vboff, n);