231 lines
7.1 KiB
C
231 lines
7.1 KiB
C
/* $NetBSD: ext2fs_bmap.c,v 1.5 2000/03/30 12:41:11 augustss Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1997 Manuel Bouyer.
|
|
* Copyright (c) 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)ufs_bmap.c 8.6 (Berkeley) 1/21/94
|
|
* Modified for ext2fs by Manuel Bouyer.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/trace.h>
|
|
|
|
#include <miscfs/specfs/specdev.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
#include <ufs/ext2fs/ext2fs.h>
|
|
#include <ufs/ext2fs/ext2fs_extern.h>
|
|
|
|
static int ext2fs_bmaparray __P((struct vnode *, ufs_daddr_t, ufs_daddr_t *,
|
|
struct indir *, int *, int *));
|
|
|
|
/*
|
|
* Bmap converts a the logical block number of a file to its physical block
|
|
* number on the disk. The conversion is done by using the logical block
|
|
* number to index into the array of block pointers described by the dinode.
|
|
*/
|
|
int
|
|
ext2fs_bmap(v)
|
|
void *v;
|
|
{
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
} */ *ap = v;
|
|
/*
|
|
* Check for underlying vnode requests and ensure that logical
|
|
* to physical mapping is requested.
|
|
*/
|
|
if (ap->a_vpp != NULL)
|
|
*ap->a_vpp = VTOI(ap->a_vp)->i_devvp;
|
|
if (ap->a_bnp == NULL)
|
|
return (0);
|
|
|
|
return (ext2fs_bmaparray(ap->a_vp, ap->a_bn, ap->a_bnp, NULL, NULL,
|
|
ap->a_runp));
|
|
}
|
|
|
|
/*
|
|
* Indirect blocks are now on the vnode for the file. They are given negative
|
|
* logical block numbers. Indirect blocks are addressed by the negative
|
|
* address of the first data block to which they point. Double indirect blocks
|
|
* are addressed by one less than the address of the first indirect block to
|
|
* which they point. Triple indirect blocks are addressed by one less than
|
|
* the address of the first double indirect block to which they point.
|
|
*
|
|
* ext2fs_bmaparray does the bmap conversion, and if requested returns the
|
|
* array of logical blocks which must be traversed to get to a block.
|
|
* Each entry contains the offset into that block that gets you to the
|
|
* next block and the disk address of the block (if it is assigned).
|
|
*/
|
|
|
|
int
|
|
ext2fs_bmaparray(vp, bn, bnp, ap, nump, runp)
|
|
struct vnode *vp;
|
|
ufs_daddr_t bn;
|
|
ufs_daddr_t *bnp;
|
|
struct indir *ap;
|
|
int *nump;
|
|
int *runp;
|
|
{
|
|
struct inode *ip;
|
|
struct buf *bp;
|
|
struct ufsmount *ump;
|
|
struct mount *mp;
|
|
struct vnode *devvp;
|
|
struct indir a[NIADDR+1], *xap;
|
|
ufs_daddr_t daddr;
|
|
long metalbn;
|
|
int error, maxrun = 0, num;
|
|
|
|
ip = VTOI(vp);
|
|
mp = vp->v_mount;
|
|
ump = VFSTOUFS(mp);
|
|
#ifdef DIAGNOSTIC
|
|
if ((ap != NULL && nump == NULL) || (ap == NULL && nump != NULL))
|
|
panic("ext2fs_bmaparray: invalid arguments");
|
|
#endif
|
|
|
|
if (runp) {
|
|
/*
|
|
* XXX
|
|
* If MAXBSIZE is the largest transfer the disks can handle,
|
|
* we probably want maxrun to be 1 block less so that we
|
|
* don't create a block larger than the device can handle.
|
|
*/
|
|
*runp = 0;
|
|
maxrun = MAXBSIZE / mp->mnt_stat.f_iosize - 1;
|
|
}
|
|
|
|
xap = ap == NULL ? a : ap;
|
|
if (!nump)
|
|
nump = #
|
|
if ((error = ufs_getlbns(vp, bn, xap, nump)) != 0)
|
|
return (error);
|
|
|
|
num = *nump;
|
|
if (num == 0) {
|
|
*bnp = blkptrtodb(ump, fs2h32(ip->i_e2fs_blocks[bn]));
|
|
if (*bnp == 0)
|
|
*bnp = -1;
|
|
else if (runp)
|
|
for (++bn; bn < NDADDR && *runp < maxrun &&
|
|
is_sequential(ump, fs2h32(ip->i_e2fs_blocks[bn - 1]),
|
|
fs2h32(ip->i_e2fs_blocks[bn]));
|
|
++bn, ++*runp);
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* Get disk address out of indirect block array */
|
|
daddr = fs2h32(ip->i_e2fs_blocks[NDADDR + xap->in_off]);
|
|
|
|
devvp = VFSTOUFS(vp->v_mount)->um_devvp;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (num > NIADDR + 1 || num < 1) {
|
|
printf("ext2fs_bmaparray: num=%d\n", num);
|
|
panic("ext2fs_bmaparray: num");
|
|
}
|
|
#endif
|
|
for (bp = NULL, ++xap; --num; ++xap) {
|
|
/*
|
|
* Exit the loop if there is no disk address assigned yet and
|
|
* the indirect block isn't in the cache, or if we were
|
|
* looking for an indirect block and we've found it.
|
|
*/
|
|
|
|
metalbn = xap->in_lbn;
|
|
if ((daddr == 0 && !incore(vp, metalbn)) || metalbn == bn)
|
|
break;
|
|
/*
|
|
* If we get here, we've either got the block in the cache
|
|
* or we have a disk address for it, go fetch it.
|
|
*/
|
|
if (bp)
|
|
brelse(bp);
|
|
|
|
xap->in_exists = 1;
|
|
bp = getblk(vp, metalbn, mp->mnt_stat.f_iosize, 0, 0);
|
|
if (bp->b_flags & (B_DONE | B_DELWRI)) {
|
|
trace(TR_BREADHIT, pack(vp, size), metalbn);
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
else if (!daddr)
|
|
panic("ext2fs_bmaparry: indirect block not in cache");
|
|
#endif
|
|
else {
|
|
trace(TR_BREADMISS, pack(vp, size), metalbn);
|
|
bp->b_blkno = blkptrtodb(ump, daddr);
|
|
bp->b_flags |= B_READ;
|
|
VOP_STRATEGY(bp);
|
|
curproc->p_stats->p_ru.ru_inblock++; /* XXX */
|
|
if ((error = biowait(bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
daddr = fs2h32(((ufs_daddr_t *)bp->b_data)[xap->in_off]);
|
|
if (num == 1 && daddr && runp)
|
|
for (bn = xap->in_off + 1;
|
|
bn < MNINDIR(ump) && *runp < maxrun &&
|
|
is_sequential(ump, ((ufs_daddr_t *)bp->b_data)[bn - 1],
|
|
((ufs_daddr_t *)bp->b_data)[bn]);
|
|
++bn, ++*runp);
|
|
}
|
|
if (bp)
|
|
brelse(bp);
|
|
|
|
daddr = blkptrtodb(ump, daddr);
|
|
*bnp = daddr == 0 ? -1 : daddr;
|
|
return (0);
|
|
}
|