cec0f20ce7
1. Add new file "sys/kern/vfs_default.c" where default actions for
VOPs go. Implement proper defaults for ABORTOP, BWRITE, LEASE,
POLL, REVOKE and STRATEGY. Various stuff spread over the entire
tree belongs here.
2. Change VOP_BLKATOFF to a normal function in cd9660.
3. Kill VOP_BLKATOFF, VOP_TRUNCATE, VOP_VFREE, VOP_VALLOC. These
are private interface functions between UFS and the underlying
storage manager layer (FFS/LFS/MFS/EXT2FS). The functions now
live in struct ufsmount instead.
4. Remove a kludge of VOP_ functions in all filesystems, that did
nothing but obscure the simplicity and break the expandability.
If a filesystem doesn't implement VOP_FOO, it shouldn't have an
entry for it in its vnops table. The system will try to DTRT
if it is not implemented. There are still some cruft left, but
the bulk of it is done.
5. Fix another VCALL in vfs_cache.c (thanks Bruce!)
542 lines
15 KiB
C
542 lines
15 KiB
C
/*
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* modified for Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*
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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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* @(#)ext2_inode.c 8.5 (Berkeley) 12/30/93
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*/
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#if !defined(__FreeBSD__)
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#include "quota.h"
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#include "diagnostic.h"
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#else
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#include "opt_quota.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/time.h>
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#if !defined(__FreeBSD__)
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#include <sys/trace.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_extern.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/ufs/ufs_extern.h>
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#include <gnu/ext2fs/ext2_fs.h>
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#include <gnu/ext2fs/ext2_fs_sb.h>
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#include <gnu/ext2fs/fs.h>
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#include <gnu/ext2fs/ext2_extern.h>
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static int ext2_indirtrunc __P((struct inode *, daddr_t, daddr_t, daddr_t, int,
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long *));
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int
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ext2_init(struct vfsconf *vfsp)
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{
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return (ufs_init(vfsp));
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}
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/*
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* Update the access, modified, and inode change times as specified by the
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* IACCESS, IUPDATE, and ICHANGE flags respectively. The IMODIFIED flag is
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* used to specify that the inode needs to be updated but that the times have
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* already been set. The access and modified times are taken from the second
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* and third parameters; the inode change time is always taken from the current
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* time. If waitfor is set, then wait for the disk write of the inode to
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* complete.
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*/
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int
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ext2_update(ap)
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struct vop_update_args /* {
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struct vnode *a_vp;
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struct timeval *a_access;
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struct timeval *a_modify;
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int a_waitfor;
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} */ *ap;
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{
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register struct ext2_sb_info *fs;
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struct buf *bp;
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struct inode *ip;
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int error;
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#if !defined(__FreeBSD__)
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struct timeval time;
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#endif
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ip = VTOI(ap->a_vp);
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if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) {
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ip->i_flag &=
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~(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE);
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return (0);
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}
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if ((ip->i_flag &
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(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0)
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return (0);
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if (ip->i_flag & IN_ACCESS)
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ip->i_atime = ap->a_access->tv_sec;
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if (ip->i_flag & IN_UPDATE) {
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ip->i_mtime = ap->a_modify->tv_sec;
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ip->i_modrev++;
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}
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if (ip->i_flag & IN_CHANGE) {
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#if !defined(__FreeBSD__)
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gettime(&time);
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#endif
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ip->i_ctime = time.tv_sec;
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}
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ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE);
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fs = ip->i_e2fs;
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if (error = bread(ip->i_devvp,
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fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
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(int)fs->s_blocksize, NOCRED, &bp)) {
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brelse(bp);
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return (error);
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}
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ext2_di2ei( &ip->i_din, (struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
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ino_to_fsbo(fs, ip->i_number)));
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/*
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if (ap->a_waitfor && (ap->a_vp->v_mount->mnt_flag & MNT_ASYNC) == 0)
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return (bwrite(bp));
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else {
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*/
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bdwrite(bp);
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return (0);
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/*
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}
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*/
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}
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#define SINGLE 0 /* index of single indirect block */
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#define DOUBLE 1 /* index of double indirect block */
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#define TRIPLE 2 /* index of triple indirect block */
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/*
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* Truncate the inode oip to at most length size, freeing the
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* disk blocks.
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*/
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int
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ext2_truncate(vp, length, flags, cred, p)
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struct vnode *vp;
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off_t length;
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int flags;
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struct ucred *cred;
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struct proc *p;
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{
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register struct vnode *ovp = vp;
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register daddr_t lastblock;
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register struct inode *oip;
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daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
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daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
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register struct ext2_sb_info *fs;
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struct buf *bp;
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int offset, size, level;
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long count, nblocks, vflags, blocksreleased = 0;
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struct timeval tv;
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register int i;
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int aflags, error, allerror;
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off_t osize;
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/*
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printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length);
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*/ /*
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* negative file sizes will totally break the code below and
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* are not meaningful anyways.
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*/
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if (length < 0)
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return EFBIG;
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oip = VTOI(ovp);
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gettime(&tv);
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if (ovp->v_type == VLNK &&
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oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
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#if DIAGNOSTIC
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if (length != 0)
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panic("ext2_truncate: partial truncate of symlink");
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#endif
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bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
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oip->i_size = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, &tv, &tv, 1));
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}
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if (oip->i_size == length) {
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, &tv, &tv, 0));
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}
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#if QUOTA
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if (error = getinoquota(oip))
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return (error);
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#endif
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fs = oip->i_e2fs;
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osize = oip->i_size;
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ext2_discard_prealloc(oip);
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/*
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* Lengthen the size of the file. We must ensure that the
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* last byte of the file is allocated. Since the smallest
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* value of oszie is 0, length will be at least 1.
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*/
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if (osize < length) {
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offset = blkoff(fs, length - 1);
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lbn = lblkno(fs, length - 1);
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aflags = B_CLRBUF;
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if (flags & IO_SYNC)
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aflags |= B_SYNC;
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vnode_pager_setsize(ovp, length);
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if (error = ext2_balloc(oip, lbn, offset + 1, cred, &bp,
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aflags))
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return (error);
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oip->i_size = length;
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#if !defined(__FreeBSD__)
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(void) vnode_pager_uncache(ovp);
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#endif
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if (aflags & IO_SYNC)
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bwrite(bp);
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else
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bawrite(bp);
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, &tv, &tv, 1));
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}
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/*
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* Shorten the size of the file. If the file is not being
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* truncated to a block boundry, the contents of the
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* partial block following the end of the file must be
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* zero'ed in case it ever become accessable again because
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* of subsequent file growth.
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*/
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/* I don't understand the comment above */
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offset = blkoff(fs, length);
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if (offset == 0) {
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oip->i_size = length;
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} else {
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lbn = lblkno(fs, length);
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aflags = B_CLRBUF;
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if (flags & IO_SYNC)
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aflags |= B_SYNC;
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if (error = ext2_balloc(oip, lbn, offset, cred, &bp,
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aflags))
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return (error);
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oip->i_size = length;
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size = blksize(fs, oip, lbn);
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#if !defined(__FreeBSD__)
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(void) vnode_pager_uncache(ovp);
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#endif
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bzero((char *)bp->b_data + offset, (u_int)(size - offset));
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allocbuf(bp, size);
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if (aflags & IO_SYNC)
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bwrite(bp);
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else
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bawrite(bp);
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}
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/*
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* Calculate index into inode's block list of
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* last direct and indirect blocks (if any)
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* which we want to keep. Lastblock is -1 when
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* the file is truncated to 0.
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*/
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lastblock = lblkno(fs, length + fs->s_blocksize - 1) - 1;
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lastiblock[SINGLE] = lastblock - NDADDR;
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lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
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lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
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nblocks = btodb(fs->s_blocksize);
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/*
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* Update file and block pointers on disk before we start freeing
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* blocks. If we crash before free'ing blocks below, the blocks
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* will be returned to the free list. lastiblock values are also
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* normalized to -1 for calls to ext2_indirtrunc below.
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*/
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bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
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for (level = TRIPLE; level >= SINGLE; level--)
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if (lastiblock[level] < 0) {
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oip->i_ib[level] = 0;
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lastiblock[level] = -1;
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}
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for (i = NDADDR - 1; i > lastblock; i--)
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oip->i_db[i] = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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if (error = VOP_UPDATE(ovp, &tv, &tv, MNT_WAIT))
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allerror = error;
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/*
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* Having written the new inode to disk, save its new configuration
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* and put back the old block pointers long enough to process them.
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* Note that we save the new block configuration so we can check it
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* when we are done.
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*/
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bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
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bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
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oip->i_size = osize;
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vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
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allerror = vinvalbuf(ovp, vflags, cred, p, 0, 0);
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/*
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* Indirect blocks first.
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*/
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indir_lbn[SINGLE] = -NDADDR;
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indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
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indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
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for (level = TRIPLE; level >= SINGLE; level--) {
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bn = oip->i_ib[level];
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if (bn != 0) {
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error = ext2_indirtrunc(oip, indir_lbn[level],
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fsbtodb(fs, bn), lastiblock[level], level, &count);
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if (error)
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allerror = error;
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blocksreleased += count;
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if (lastiblock[level] < 0) {
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oip->i_ib[level] = 0;
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ext2_blkfree(oip, bn, fs->s_frag_size);
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blocksreleased += nblocks;
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}
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}
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if (lastiblock[level] >= 0)
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goto done;
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}
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/*
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* All whole direct blocks or frags.
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*/
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for (i = NDADDR - 1; i > lastblock; i--) {
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register long bsize;
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bn = oip->i_db[i];
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if (bn == 0)
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continue;
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oip->i_db[i] = 0;
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bsize = blksize(fs, oip, i);
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ext2_blkfree(oip, bn, bsize);
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blocksreleased += btodb(bsize);
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}
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if (lastblock < 0)
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goto done;
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/*
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* Finally, look for a change in size of the
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* last direct block; release any frags.
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*/
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bn = oip->i_db[lastblock];
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if (bn != 0) {
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long oldspace, newspace;
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/*
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* Calculate amount of space we're giving
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* back as old block size minus new block size.
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*/
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oldspace = blksize(fs, oip, lastblock);
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oip->i_size = length;
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newspace = blksize(fs, oip, lastblock);
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if (newspace == 0)
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panic("itrunc: newspace");
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if (oldspace - newspace > 0) {
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/*
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* Block number of space to be free'd is
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* the old block # plus the number of frags
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* required for the storage we're keeping.
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*/
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bn += numfrags(fs, newspace);
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ext2_blkfree(oip, bn, oldspace - newspace);
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blocksreleased += btodb(oldspace - newspace);
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}
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}
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done:
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#if DIAGNOSTIC
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for (level = SINGLE; level <= TRIPLE; level++)
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if (newblks[NDADDR + level] != oip->i_ib[level])
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panic("itrunc1");
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for (i = 0; i < NDADDR; i++)
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if (newblks[i] != oip->i_db[i])
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panic("itrunc2");
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if (length == 0 &&
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(ovp->v_dirtyblkhd.lh_first || ovp->v_cleanblkhd.lh_first))
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panic("itrunc3");
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#endif /* DIAGNOSTIC */
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/*
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* Put back the real size.
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*/
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oip->i_size = length;
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oip->i_blocks -= blocksreleased;
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if (oip->i_blocks < 0) /* sanity */
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oip->i_blocks = 0;
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oip->i_flag |= IN_CHANGE;
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vnode_pager_setsize(ovp, length);
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#if QUOTA
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(void) chkdq(oip, -blocksreleased, NOCRED, 0);
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#endif
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return (allerror);
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}
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/*
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* Release blocks associated with the inode ip and stored in the indirect
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* block bn. Blocks are free'd in LIFO order up to (but not including)
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* lastbn. If level is greater than SINGLE, the block is an indirect block
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* and recursive calls to indirtrunc must be used to cleanse other indirect
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* blocks.
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*
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* NB: triple indirect blocks are untested.
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*/
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static int
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ext2_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
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register struct inode *ip;
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daddr_t lbn, lastbn;
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daddr_t dbn;
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int level;
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long *countp;
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{
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register int i;
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struct buf *bp;
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register struct ext2_sb_info *fs = ip->i_e2fs;
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register daddr_t *bap;
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struct vnode *vp;
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daddr_t *copy, nb, nlbn, last;
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long blkcount, factor;
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int nblocks, blocksreleased = 0;
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int error = 0, allerror = 0;
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|
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/*
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* Calculate index in current block of last
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* block to be kept. -1 indicates the entire
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* block so we need not calculate the index.
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*/
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factor = 1;
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for (i = SINGLE; i < level; i++)
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factor *= NINDIR(fs);
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last = lastbn;
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if (lastbn > 0)
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last /= factor;
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nblocks = btodb(fs->s_blocksize);
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/*
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* Get buffer of block pointers, zero those entries corresponding
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* to blocks to be free'd, and update on disk copy first. Since
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* double(triple) indirect before single(double) indirect, calls
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* to bmap on these blocks will fail. However, we already have
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* the on disk address, so we have to set the b_blkno field
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* explicitly instead of letting bread do everything for us.
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*/
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vp = ITOV(ip);
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bp = getblk(vp, lbn, (int)fs->s_blocksize, 0, 0);
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if (bp->b_flags & (B_DONE | B_DELWRI)) {
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/* Braces must be here in case trace evaluates to nothing. */
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#if !defined(__FreeBSD__)
|
|
trace(TR_BREADHIT, pack(vp, fs->s_blocksize), lbn);
|
|
#endif
|
|
} else {
|
|
#if !defined(__FreeBSD__)
|
|
trace(TR_BREADMISS, pack(vp, fs->s_blocksize), lbn);
|
|
get_proc()->p_stats->p_ru.ru_inblock++; /* pay for read */
|
|
#endif
|
|
bp->b_flags |= B_READ;
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("ext2_indirtrunc: bad buffer size");
|
|
bp->b_blkno = dbn;
|
|
#if defined(__FreeBSD__)
|
|
vfs_busy_pages(bp, 0);
|
|
#endif
|
|
VOP_STRATEGY(bp);
|
|
error = biowait(bp);
|
|
}
|
|
if (error) {
|
|
brelse(bp);
|
|
*countp = 0;
|
|
return (error);
|
|
}
|
|
|
|
bap = (daddr_t *)bp->b_data;
|
|
MALLOC(copy, daddr_t *, fs->s_blocksize, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->s_blocksize);
|
|
bzero((caddr_t)&bap[last + 1],
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t));
|
|
if (last == -1)
|
|
bp->b_flags |= B_INVAL;
|
|
error = bwrite(bp);
|
|
if (error)
|
|
allerror = error;
|
|
bap = copy;
|
|
|
|
/*
|
|
* Recursively free totally unused blocks.
|
|
*/
|
|
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
|
|
i--, nlbn += factor) {
|
|
nb = bap[i];
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
if (error = ext2_indirtrunc(ip, nlbn,
|
|
fsbtodb(fs, nb), (daddr_t)-1, level - 1, &blkcount))
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
ext2_blkfree(ip, nb, fs->s_blocksize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = bap[i];
|
|
if (nb != 0) {
|
|
if (error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
last, level - 1, &blkcount))
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
FREE(copy, M_TEMP);
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* discard preallocated blocks
|
|
*/
|
|
int
|
|
ext2_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
ext2_discard_prealloc(VTOI(ap->a_vp));
|
|
return ufs_inactive(ap);
|
|
}
|
|
|