--- /dev/null
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+/*
+ * Elements of this file were originally from the FreeBSD "biosboot"
+ * bootloader file "disk.c" dated 4/12/95.
+ *
+ * The license and header comments from that file are included here.
+ */
+
+/*
+ * Mach Operating System
+ * Copyright (c) 1992, 1991 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ *
+ * from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
+ * $Id: fsys_ffs.c,v 1.10 2001/11/12 06:57:29 okuji Exp $
+ */
+
+#ifdef FSYS_FFS
+
+#include "shared.h"
+
+#include "filesys.h"
+
+#include "defs.h"
+#include "disk_inode.h"
+#include "disk_inode_ffs.h"
+#include "dir.h"
+#include "fs.h"
+
+/* used for filesystem map blocks */
+static int mapblock;
+static int mapblock_offset;
+static int mapblock_bsize;
+
+/* pointer to superblock */
+#define SUPERBLOCK ((struct fs *) ( FSYS_BUF + 8192 ))
+#define INODE ((struct icommon *) ( FSYS_BUF + 16384 ))
+#define MAPBUF ( FSYS_BUF + 24576 )
+#define MAPBUF_LEN 8192
+
+
+int
+ffs_mount (void)
+{
+ int retval = 1;
+
+ if ((((current_drive & 0x80) || (current_slice != 0))
+ && ! IS_PC_SLICE_TYPE_BSD_WITH_FS (current_slice, FS_BSDFFS))
+ || part_length < (SBLOCK + (SBSIZE / DEV_BSIZE))
+ || !devread (SBLOCK, 0, SBSIZE, (char *) SUPERBLOCK)
+ || SUPERBLOCK->fs_magic != FS_MAGIC)
+ retval = 0;
+
+ mapblock = -1;
+ mapblock_offset = -1;
+
+ return retval;
+}
+
+static int
+block_map (int file_block)
+{
+ int bnum, offset, bsize;
+
+ if (file_block < NDADDR)
+ return (INODE->i_db[file_block]);
+
+ /* If the blockmap loaded does not include FILE_BLOCK,
+ load a new blockmap. */
+ if ((bnum = fsbtodb (SUPERBLOCK, INODE->i_ib[0])) != mapblock
+ || (mapblock_offset <= bnum && bnum <= mapblock_offset + mapblock_bsize))
+ {
+ if (MAPBUF_LEN < SUPERBLOCK->fs_bsize)
+ {
+ offset = ((file_block - NDADDR) % NINDIR (SUPERBLOCK));
+ bsize = MAPBUF_LEN;
+
+ if (offset + MAPBUF_LEN > SUPERBLOCK->fs_bsize)
+ offset = (SUPERBLOCK->fs_bsize - MAPBUF_LEN) / sizeof (int);
+ }
+ else
+ {
+ bsize = SUPERBLOCK->fs_bsize;
+ offset = 0;
+ }
+
+ if (! devread (bnum, offset * sizeof (int), bsize, (char *) MAPBUF))
+ {
+ mapblock = -1;
+ mapblock_bsize = -1;
+ mapblock_offset = -1;
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+
+ mapblock = bnum;
+ mapblock_bsize = bsize;
+ mapblock_offset = offset;
+ }
+
+ return (((int *) MAPBUF)[((file_block - NDADDR) % NINDIR (SUPERBLOCK))
+ - mapblock_offset]);
+}
+
+
+int
+ffs_read (char *buf, int len)
+{
+ int logno, off, size, map, ret = 0;
+
+ while (len && !errnum)
+ {
+ off = blkoff (SUPERBLOCK, filepos);
+ logno = lblkno (SUPERBLOCK, filepos);
+ size = blksize (SUPERBLOCK, INODE, logno);
+
+ if ((map = block_map (logno)) < 0)
+ break;
+
+ size -= off;
+
+ if (size > len)
+ size = len;
+
+ disk_read_func = disk_read_hook;
+
+ devread (fsbtodb (SUPERBLOCK, map), off, size, buf);
+
+ disk_read_func = NULL;
+
+ buf += size;
+ len -= size;
+ filepos += size;
+ ret += size;
+ }
+
+ if (errnum)
+ ret = 0;
+
+ return ret;
+}
+
+
+int
+ffs_dir (char *dirname)
+{
+ char *rest, ch;
+ int block, off, loc, map, ino = ROOTINO;
+ struct direct *dp;
+
+/* main loop to find destination inode */
+loop:
+
+ /* load current inode (defaults to the root inode) */
+
+ if (!devread (fsbtodb (SUPERBLOCK, itod (SUPERBLOCK, ino)),
+ ino % (SUPERBLOCK->fs_inopb) * sizeof (struct dinode),
+ sizeof (struct dinode), (char *) INODE))
+ return 0; /* XXX what return value? */
+
+ /* if we have a real file (and we're not just printing possibilities),
+ then this is where we want to exit */
+
+ if (!*dirname || isspace (*dirname))
+ {
+ if ((INODE->i_mode & IFMT) != IFREG)
+ {
+ errnum = ERR_BAD_FILETYPE;
+ return 0;
+ }
+
+ filemax = INODE->i_size;
+
+ /* incomplete implementation requires this! */
+ fsmax = (NDADDR + NINDIR (SUPERBLOCK)) * SUPERBLOCK->fs_bsize;
+ return 1;
+ }
+
+ /* continue with file/directory name interpretation */
+
+ while (*dirname == '/')
+ dirname++;
+
+ if (!(INODE->i_size) || ((INODE->i_mode & IFMT) != IFDIR))
+ {
+ errnum = ERR_BAD_FILETYPE;
+ return 0;
+ }
+
+ for (rest = dirname; (ch = *rest) && !isspace (ch) && ch != '/'; rest++);
+
+ *rest = 0;
+ loc = 0;
+
+ /* loop for reading a the entries in a directory */
+
+ do
+ {
+ if (loc >= INODE->i_size)
+ {
+#if 0
+ putchar ('\n');
+#endif
+
+ if (print_possibilities < 0)
+ return 1;
+
+ errnum = ERR_FILE_NOT_FOUND;
+ *rest = ch;
+ return 0;
+ }
+
+ if (!(off = blkoff (SUPERBLOCK, loc)))
+ {
+ block = lblkno (SUPERBLOCK, loc);
+
+ if ((map = block_map (block)) < 0
+ || !devread (fsbtodb (SUPERBLOCK, map), 0,
+ blksize (SUPERBLOCK, INODE, block),
+ (char *) FSYS_BUF))
+ {
+ errnum = ERR_FSYS_CORRUPT;
+ *rest = ch;
+ return 0;
+ }
+ }
+
+ dp = (struct direct *) (FSYS_BUF + off);
+ loc += dp->d_reclen;
+
+#ifndef STAGE1_5
+ if (dp->d_ino && print_possibilities && ch != '/'
+ && (!*dirname || substring (dirname, dp->d_name) <= 0))
+ {
+ if (print_possibilities > 0)
+ print_possibilities = -print_possibilities;
+
+ print_a_completion (dp->d_name);
+ }
+#endif /* STAGE1_5 */
+ }
+ while (!dp->d_ino || (substring (dirname, dp->d_name) != 0
+ || (print_possibilities && ch != '/')));
+
+ /* only get here if we have a matching directory entry */
+
+ ino = dp->d_ino;
+ *(dirname = rest) = ch;
+
+ /* go back to main loop at top of function */
+ goto loop;
+}
+
+int
+ffs_embed (int *start_sector, int needed_sectors)
+{
+ /* XXX: I don't know if this is really correct. Someone who is
+ familiar with BSD should check for this. */
+ if (needed_sectors > 14)
+ return 0;
+
+ *start_sector = 1;
+#if 1
+ /* FIXME: Disable the embedding in FFS until someone checks if
+ the code above is correct. */
+ return 0;
+#else
+ return 1;
+#endif
+}
+
+#endif /* FSYS_FFS */
Code Review / kvmfornfv.git / blobdiff