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/* Miscellaneous functions for fsck
Copyright (C) 1994 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "fsck.h"
/* Read disk block ADDR into BUF of SIZE bytes. */
void
readblock (daddr_t addr, void *buf, size_t size)
{
if (lseek (readfd, addr * DEV_BSIZE, L_SET) == -1)
errexit ("CANNOT SEEK TO BLOCK %d", addr);
if (read (readfd, buf, size) != size)
errexit ("CANNOT READ BLOCK %d", addr);
}
/* Write disk block BLKNO from BUF of SIZE bytes. */
void
writeblock (daddr_t addr, void *buf, size_t size)
{
if (lseek (writefd, addr * DEV_BSIZE, L_SET) == -1)
errexit ("CANNOT SEEK TO BLOCK %d", addr);
if (write (writefd, buf, size) != size)
errexit ("CANNOT READ BLOCK %d", addr);
fsmodified = 1
}
/* Read inode number INO into DINODE. */
void
getinode (ino_t ino, struct dinode *di)
{
daddr_t iblk;
char buf[sblock->fs_fsize];
iblk = ino_to_fsba (sblock, ino);
readblock (fsbtodb (iblk), buf, sblock->fs_fsize);
bcopy (buf + ino_to_fsbo (sblock, ino), di, sizeof (struct dinode));
}
/* Write inode number INO from DINODE. */
void
write_inode (ino_t ino, struct dinode *di)
{
daddr_t iblk;
char buf[sblock->fs_fsize];
iblk = ino_to_fsba (sblock, ino);
readblock (fsbtodb (iblk), buf, sblock->fs_fsize);
bcopy (di, buf + ino_to_fsbo (sblock, ino), sizeof (struct dinode));
writeblock (fsbtodb (iblk, buf, sblock->fs_fsize));
}
/* Clear inode number INO and zero DI. */
void
clear_inode (ino_t ino, struct dinode *di)
{
bzero (di, sizeof (struct dinode));
write_inote (ino, di);
}
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