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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* Elements of this file were originally from the FreeBSD "biosboot"
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* bootloader file "disk.c" dated 4/12/95.
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* The license and header comments from that file are included here.
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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* Carnegie Mellon requests users of this software to return to
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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* from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
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* $Id: fsys_ffs.c,v 1.10 2001/11/12 06:57:29 okuji Exp $
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#include "disk_inode.h"
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#include "disk_inode_ffs.h"
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/* used for filesystem map blocks */
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static int mapblock_offset;
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static int mapblock_bsize;
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/* pointer to superblock */
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#define SUPERBLOCK ((struct fs *) ( FSYS_BUF + 8192 ))
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#define INODE ((struct icommon *) ( FSYS_BUF + 16384 ))
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#define MAPBUF ( FSYS_BUF + 24576 )
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#define MAPBUF_LEN 8192
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if ((((current_drive & 0x80) || (current_slice != 0))
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&& ! IS_PC_SLICE_TYPE_BSD_WITH_FS (current_slice, FS_BSDFFS))
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|| part_length < (SBLOCK + (SBSIZE / DEV_BSIZE))
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|| !devread (SBLOCK, 0, SBSIZE, (char *) SUPERBLOCK)
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|| SUPERBLOCK->fs_magic != FS_MAGIC)
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block_map (int file_block)
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int bnum, offset, bsize;
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if (file_block < NDADDR)
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return (INODE->i_db[file_block]);
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/* If the blockmap loaded does not include FILE_BLOCK,
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load a new blockmap. */
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if ((bnum = fsbtodb (SUPERBLOCK, INODE->i_ib[0])) != mapblock
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|| (mapblock_offset <= bnum && bnum <= mapblock_offset + mapblock_bsize))
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if (MAPBUF_LEN < SUPERBLOCK->fs_bsize)
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offset = ((file_block - NDADDR) % NINDIR (SUPERBLOCK));
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if (offset + MAPBUF_LEN > SUPERBLOCK->fs_bsize)
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offset = (SUPERBLOCK->fs_bsize - MAPBUF_LEN) / sizeof (int);
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bsize = SUPERBLOCK->fs_bsize;
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if (! devread (bnum, offset * sizeof (int), bsize, (char *) MAPBUF))
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mapblock_offset = -1;
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errnum = ERR_FSYS_CORRUPT;
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mapblock_bsize = bsize;
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mapblock_offset = offset;
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return (((int *) MAPBUF)[((file_block - NDADDR) % NINDIR (SUPERBLOCK))
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ffs_read (char *buf, int len)
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int logno, off, size, map, ret = 0;
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while (len && !errnum)
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off = blkoff (SUPERBLOCK, filepos);
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logno = lblkno (SUPERBLOCK, filepos);
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size = blksize (SUPERBLOCK, INODE, logno);
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if ((map = block_map (logno)) < 0)
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disk_read_func = disk_read_hook;
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devread (fsbtodb (SUPERBLOCK, map), off, size, buf);
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disk_read_func = NULL;
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ffs_dir (char *dirname)
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int block, off, loc, map, ino = ROOTINO;
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/* main loop to find destination inode */
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/* load current inode (defaults to the root inode) */
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if (!devread (fsbtodb (SUPERBLOCK, itod (SUPERBLOCK, ino)),
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ino % (SUPERBLOCK->fs_inopb) * sizeof (struct dinode),
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sizeof (struct dinode), (char *) INODE))
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return 0; /* XXX what return value? */
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/* if we have a real file (and we're not just printing possibilities),
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then this is where we want to exit */
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if (!*dirname || isspace (*dirname))
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if ((INODE->i_mode & IFMT) != IFREG)
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errnum = ERR_BAD_FILETYPE;
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filemax = INODE->i_size;
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/* incomplete implementation requires this! */
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fsmax = (NDADDR + NINDIR (SUPERBLOCK)) * SUPERBLOCK->fs_bsize;
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/* continue with file/directory name interpretation */
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while (*dirname == '/')
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if (!(INODE->i_size) || ((INODE->i_mode & IFMT) != IFDIR))
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errnum = ERR_BAD_FILETYPE;
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for (rest = dirname; (ch = *rest) && !isspace (ch) && ch != '/'; rest++);
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/* loop for reading a the entries in a directory */
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if (loc >= INODE->i_size)
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if (print_possibilities < 0)
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errnum = ERR_FILE_NOT_FOUND;
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if (!(off = blkoff (SUPERBLOCK, loc)))
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block = lblkno (SUPERBLOCK, loc);
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if ((map = block_map (block)) < 0
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|| !devread (fsbtodb (SUPERBLOCK, map), 0,
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blksize (SUPERBLOCK, INODE, block),
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errnum = ERR_FSYS_CORRUPT;
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dp = (struct direct *) (FSYS_BUF + off);
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if (dp->d_ino && print_possibilities && ch != '/'
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&& (!*dirname || substring (dirname, dp->d_name) <= 0))
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if (print_possibilities > 0)
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print_possibilities = -print_possibilities;
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print_a_completion (dp->d_name);
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#endif /* STAGE1_5 */
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while (!dp->d_ino || (substring (dirname, dp->d_name) != 0
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|| (print_possibilities && ch != '/')));
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/* only get here if we have a matching directory entry */
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*(dirname = rest) = ch;
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/* go back to main loop at top of function */
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ffs_embed (int *start_sector, int needed_sectors)
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/* XXX: I don't know if this is really correct. Someone who is
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familiar with BSD should check for this. */
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if (needed_sectors > 14)
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/* FIXME: Disable the embedding in FFS until someone checks if
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the code above is correct. */
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#endif /* FSYS_FFS */
added
removed
stage2/fsys_ffs.c
