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/* $OpenBSD: ext2fs_subr.c,v 1.35 2016/08/10 07:53:02 natano Exp $ */
/* $NetBSD: ext2fs_subr.c,v 1.1 1997/06/11 09:34:03 bouyer 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. 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/mount.h>
#include <sys/buf.h>
#include <sys/specdev.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_extern.h>
#include <ufs/ext2fs/ext2fs_extents.h>
#ifdef _KERNEL
/*
* 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_bufatoff(struct inode *ip, off_t offset, char **res, struct buf **bpp)
{
struct vnode *vp;
struct m_ext2fs *fs;
struct buf *bp;
daddr_t lbn, pos;
int error;
vp = ITOV(ip);
fs = ip->i_e2fs;
lbn = lblkno(fs, offset);
if (ip->i_e2din->e2di_flags & EXT4_EXTENTS) {
struct ext4_extent_path path;
struct ext4_extent *ep;
memset(&path, 0, sizeof path);
if (ext4_ext_find_extent(fs, ip, lbn, &path) == NULL ||
(ep = path.ep_ext) == NULL)
goto normal;
if (path.ep_bp != NULL) {
brelse(path.ep_bp);
path.ep_bp = NULL;
}
pos = lbn - ep->e_blk + (((daddr_t)ep->e_start_hi << 32) | ep->e_start_lo);
error = bread(ip->i_devvp, fsbtodb(fs, pos), fs->e2fs_bsize, &bp);
if (error) {
brelse(bp);
return (error);
}
if (res)
*res = (char *)bp->b_data + blkoff(fs, offset);
*bpp = bp;
return (0);
}
normal:
*bpp = NULL;
if ((error = bread(vp, lbn, fs->e2fs_bsize, &bp)) != 0) {
brelse(bp);
return (error);
}
if (res)
*res = (char *)bp->b_data + blkoff(fs, offset);
*bpp = bp;
return (0);
}
#endif
#if defined(_KERNEL) && defined(DIAGNOSTIC)
void
ext2fs_checkoverlap(struct buf *bp, struct inode *ip)
{
struct buf *ep;
struct vnode *vp;
daddr_t start, last;
start = bp->b_blkno;
last = start + btodb(bp->b_bcount) - 1;
LIST_FOREACH(ep, &bufhead, b_list) {
if (ep == bp || (ep->b_flags & B_INVAL) ||
ep->b_vp == NULLVP)
continue;
if (VOP_BMAP(ep->b_vp, 0, &vp, NULL, 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 %lld, end %lld overlap start %lld, end %lld\n",
start, last, (long long)ep->b_blkno,
(long long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
panic("Disk buffer overlap");
}
}
#endif /* DIAGNOSTIC */
/*
* Initialize the vnode associated with a new inode, handle aliased vnodes.
*/
int
ext2fs_vinit(struct mount *mp, struct vnode **vpp)
{
struct inode *ip;
struct vnode *vp, *nvp;
struct timeval tv;
vp = *vpp;
ip = VTOI(vp);
vp->v_type = IFTOVT(ip->i_e2fs_mode);
switch(vp->v_type) {
case VCHR:
case VBLK:
vp->v_op = &ext2fs_specvops;
nvp = checkalias(vp, letoh32(ip->i_e2din->e2di_rdev), mp);
if (nvp != NULL) {
/*
* Discard unneeded vnode, but save its inode. Note
* that the lock is carried over in the inode to the
* replacement vnode.
*/
nvp->v_data = vp->v_data;
vp->v_data = NULL;
vp->v_op = &spec_vops;
#ifdef VFSLCKDEBUG
vp->v_flag &= ~VLOCKSWORK;
#endif
vrele(vp);
vgone(vp);
/* Reinitialize aliased vnode. */
vp = nvp;
ip->i_vnode = vp;
}
break;
case VFIFO:
#ifdef FIFO
vp->v_op = &ext2fs_fifovops;
break;
#else
return (EOPNOTSUPP);
#endif /* FIFO */
default:
break;
}
if (ip->i_number == EXT2_ROOTINO)
vp->v_flag |= VROOT;
/* Initialize modrev times */
getmicrouptime(&tv);
ip->i_modrev = (u_quad_t)tv.tv_sec << 32;
ip->i_modrev |= (u_quad_t)tv.tv_usec * 4294;
*vpp = vp;
return (0);
}
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