118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/* $NetBSD: ext2fs_subr.c,v 1.3 1998/03/04 06:50:25 cgd Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer.
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
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* Modified for ext2fs by Manuel Bouyer.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/buf.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_extern.h>
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/*
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* Return buffer with the contents of block "offset" from the beginning of
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* directory "ip". If "res" is non-zero, fill it in with a pointer to the
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* remaining space in the directory.
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*/
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int
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ext2fs_blkatoff(v)
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void *v;
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{
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struct vop_blkatoff_args /* {
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struct vnode *a_vp;
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off_t a_offset;
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char **a_res;
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struct buf **a_bpp;
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} */ *ap = v;
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struct inode *ip;
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register struct m_ext2fs *fs;
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struct buf *bp;
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ufs_daddr_t lbn;
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int error;
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ip = VTOI(ap->a_vp);
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fs = ip->i_e2fs;
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lbn = lblkno(fs, ap->a_offset);
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*ap->a_bpp = NULL;
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if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) {
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brelse(bp);
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return (error);
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}
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if (ap->a_res)
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*ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
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*ap->a_bpp = bp;
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return (0);
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}
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#ifdef DIAGNOSTIC
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void
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ext2fs_checkoverlap(bp, ip)
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struct buf *bp;
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struct inode *ip;
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{
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register struct buf *ebp, *ep;
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register ufs_daddr_t start, last;
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struct vnode *vp;
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ebp = &buf[nbuf];
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start = bp->b_blkno;
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last = start + btodb(bp->b_bcount) - 1;
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for (ep = buf; ep < ebp; ep++) {
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if (ep == bp || (ep->b_flags & B_INVAL) ||
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ep->b_vp == NULLVP)
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continue;
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if (VOP_BMAP(ep->b_vp, (ufs_daddr_t)0, &vp, (ufs_daddr_t)0, NULL))
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continue;
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if (vp != ip->i_devvp)
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continue;
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/* look for overlap */
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if (ep->b_bcount == 0 || ep->b_blkno > last ||
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ep->b_blkno + btodb(ep->b_bcount) <= start)
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continue;
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vprint("Disk overlap", vp);
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printf("\tstart %d, end %d overlap start %d, end %ld\n",
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start, last, ep->b_blkno,
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ep->b_blkno + btodb(ep->b_bcount) - 1);
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panic("Disk buffer overlap");
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}
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}
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#endif
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