118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/* $NetBSD: ext2fs_subr.c,v 1.4 2000/03/30 12:41:11 augustss Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1997 Manuel Bouyer.
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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
|
|
* Modified for ext2fs by Manuel Bouyer.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/buf.h>
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ext2fs/ext2fs.h>
|
|
#include <ufs/ext2fs/ext2fs_extern.h>
|
|
|
|
/*
|
|
* 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
|
|
ext2fs_blkatoff(v)
|
|
void *v;
|
|
{
|
|
struct vop_blkatoff_args /* {
|
|
struct vnode *a_vp;
|
|
off_t a_offset;
|
|
char **a_res;
|
|
struct buf **a_bpp;
|
|
} */ *ap = v;
|
|
struct inode *ip;
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
ufs_daddr_t lbn;
|
|
int error;
|
|
|
|
ip = VTOI(ap->a_vp);
|
|
fs = ip->i_e2fs;
|
|
lbn = lblkno(fs, ap->a_offset);
|
|
|
|
*ap->a_bpp = NULL;
|
|
if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (ap->a_res)
|
|
*ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
|
|
*ap->a_bpp = bp;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
void
|
|
ext2fs_checkoverlap(bp, ip)
|
|
struct buf *bp;
|
|
struct inode *ip;
|
|
{
|
|
struct buf *ebp, *ep;
|
|
ufs_daddr_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) ||
|
|
ep->b_vp == NULLVP)
|
|
continue;
|
|
if (VOP_BMAP(ep->b_vp, (ufs_daddr_t)0, &vp, (ufs_daddr_t)0, NULL))
|
|
continue;
|
|
if (vp != ip->i_devvp)
|
|
continue;
|
|
/* 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);
|
|
printf("\tstart %d, end %d overlap start %d, end %ld\n",
|
|
start, last, ep->b_blkno,
|
|
ep->b_blkno + btodb(ep->b_bcount) - 1);
|
|
panic("Disk buffer overlap");
|
|
}
|
|
}
|
|
#endif
|