Current Path : /sys/amd64/compile/hs32/modules/usr/src/sys/modules/if_tun/@/boot/common/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/if_tun/@/boot/common/ufsread.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: release/9.1.0/sys/boot/common/ufsread.c 233468 2012-03-25 16:24:42Z marius $"); #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 /* * 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 ino_t lookup(const char *); static ssize_t fsread(ino_t, void *, size_t); static uint8_t ls, dsk_meta; static uint32_t fs_off; static __inline uint8_t fsfind(const char *name, 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 ino_t lookup(const char *path) { static char name[MAXNAMLEN + 1]; const char *s; 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(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 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; }