121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/*-
|
|
* modified for Lites 1.1
|
|
*
|
|
* Aug 1995, Godmar Back (gback@cs.utah.edu)
|
|
* University of Utah, Department of Computer Science
|
|
*/
|
|
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/ucred.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <gnu/fs/ext2fs/inode.h>
|
|
#include <gnu/fs/ext2fs/ext2_extern.h>
|
|
#include <gnu/fs/ext2fs/ext2_fs_sb.h>
|
|
#include <gnu/fs/ext2fs/fs.h>
|
|
|
|
#ifdef KDB
|
|
void ext2_checkoverlap(struct buf *, struct inode *);
|
|
#endif
|
|
|
|
/*
|
|
* Return buffer with the contents of block "offset" from the beginning of
|
|
* directory "ip". If "res" is non-zero, fill it in with a pointer to the
|
|
* remaining space in the directory.
|
|
*/
|
|
int
|
|
ext2_blkatoff(vp, offset, res, bpp)
|
|
struct vnode *vp;
|
|
off_t offset;
|
|
char **res;
|
|
struct buf **bpp;
|
|
{
|
|
struct inode *ip;
|
|
struct ext2_sb_info *fs;
|
|
struct buf *bp;
|
|
int32_t lbn;
|
|
int bsize, error;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_e2fs;
|
|
lbn = lblkno(fs, offset);
|
|
bsize = blksize(fs, ip, lbn);
|
|
|
|
*bpp = NULL;
|
|
if ((error = bread(vp, lbn, bsize, NOCRED, &bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (res)
|
|
*res = (char *)bp->b_data + blkoff(fs, offset);
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef KDB
|
|
void
|
|
ext2_checkoverlap(bp, ip)
|
|
struct buf *bp;
|
|
struct inode *ip;
|
|
{
|
|
struct buf *ebp, *ep;
|
|
int32_t start, last;
|
|
struct vnode *vp;
|
|
|
|
ebp = &buf[nbuf];
|
|
start = bp->b_blkno;
|
|
last = start + btodb(bp->b_bcount) - 1;
|
|
for (ep = buf; ep < ebp; ep++) {
|
|
if (ep == bp || (ep->b_flags & B_INVAL))
|
|
continue;
|
|
vp = ip->i_devvp;
|
|
/* look for overlap */
|
|
if (ep->b_bcount == 0 || ep->b_blkno > last ||
|
|
ep->b_blkno + btodb(ep->b_bcount) <= start)
|
|
continue;
|
|
vprint("Disk overlap", vp);
|
|
(void)printf("\tstart %d, end %d overlap start %lld, end %ld\n",
|
|
start, last, (long long)ep->b_blkno,
|
|
(long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
|
|
panic("Disk buffer overlap");
|
|
}
|
|
}
|
|
#endif /* KDB */
|