843 lines
24 KiB
C
843 lines
24 KiB
C
/* $NetBSD: lfs_inode.c,v 1.79 2003/08/07 16:34:36 agc Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Konrad E. Schroder <perseant@hhhh.org>.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1986, 1989, 1991, 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. 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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* @(#)lfs_inode.c 8.9 (Berkeley) 5/8/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lfs_inode.c,v 1.79 2003/08/07 16:34:36 agc Exp $");
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#if defined(_KERNEL_OPT)
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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/proc.h>
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#include <sys/file.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/trace.h>
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#include <sys/resourcevar.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/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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static int lfs_update_seguse(struct lfs *, long, size_t);
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static int lfs_indirtrunc (struct inode *, daddr_t, daddr_t,
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daddr_t, int, long *, long *, long *, size_t *,
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struct proc *);
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static int lfs_blkfree (struct lfs *, daddr_t, size_t, long *, size_t *);
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static int lfs_vtruncbuf(struct vnode *, daddr_t, int, int);
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/* Search a block for a specific dinode. */
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struct ufs1_dinode *
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lfs_ifind(struct lfs *fs, ino_t ino, struct buf *bp)
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{
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struct ufs1_dinode *dip = (struct ufs1_dinode *)bp->b_data;
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struct ufs1_dinode *ldip, *fin;
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#ifdef LFS_IFILE_FRAG_ADDRESSING
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if (fs->lfs_version == 1)
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fin = dip + INOPB(fs);
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else
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fin = dip + INOPF(fs);
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#else
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fin = dip + INOPB(fs);
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#endif
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/*
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* Read the inode block backwards, since later versions of the
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* inode will supercede earlier ones. Though it is unlikely, it is
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* possible that the same inode will appear in the same inode block.
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*/
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for (ldip = fin - 1; ldip >= dip; --ldip)
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if (ldip->di_inumber == ino)
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return (ldip);
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printf("searched %d entries\n", (int)(fin - dip));
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printf("offset is 0x%x (seg %d)\n", fs->lfs_offset,
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dtosn(fs, fs->lfs_offset));
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printf("block is 0x%llx (seg %lld)\n",
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(unsigned long long)dbtofsb(fs, bp->b_blkno),
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(long long)dtosn(fs, dbtofsb(fs, bp->b_blkno)));
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return NULL;
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}
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int
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lfs_update(void *v)
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{
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struct vop_update_args /* {
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struct vnode *a_vp;
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struct timespec *a_access;
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struct timespec *a_modify;
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int a_flags;
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} */ *ap = v;
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struct inode *ip;
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struct vnode *vp = ap->a_vp;
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struct timespec ts;
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struct lfs *fs = VFSTOUFS(vp->v_mount)->um_lfs;
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int s;
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if (vp->v_mount->mnt_flag & MNT_RDONLY)
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return (0);
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ip = VTOI(vp);
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/*
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* If we are called from vinvalbuf, and the file's blocks have
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* already been scheduled for writing, but the writes have not
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* yet completed, lfs_vflush will not be called, and vinvalbuf
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* will cause a panic. So, we must wait until any pending write
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* for our inode completes, if we are called with UPDATE_WAIT set.
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*/
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s = splbio();
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while ((ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) == UPDATE_WAIT &&
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WRITEINPROG(vp)) {
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#ifdef DEBUG_LFS
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printf("lfs_update: sleeping on inode %d (in-progress)\n",
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ip->i_number);
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#endif
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tsleep(vp, (PRIBIO+1), "lfs_update", 0);
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}
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splx(s);
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TIMEVAL_TO_TIMESPEC(&time, &ts);
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LFS_ITIMES(ip,
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ap->a_access ? ap->a_access : &ts,
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ap->a_modify ? ap->a_modify : &ts, &ts);
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if ((ip->i_flag & (IN_MODIFIED | IN_ACCESSED | IN_CLEANING)) == 0) {
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return (0);
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}
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/* If sync, push back the vnode and any dirty blocks it may have. */
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if ((ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) == UPDATE_WAIT) {
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/* Avoid flushing VDIROP. */
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++fs->lfs_diropwait;
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while (vp->v_flag & VDIROP) {
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#ifdef DEBUG_LFS
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printf("lfs_update: sleeping on inode %d (dirops)\n",
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ip->i_number);
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printf("lfs_update: vflags 0x%x, iflags 0x%x\n",
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vp->v_flag, ip->i_flag);
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#endif
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if (fs->lfs_dirops == 0)
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lfs_flush_fs(fs, SEGM_SYNC);
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else
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tsleep(&fs->lfs_writer, PRIBIO+1, "lfs_fsync",
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0);
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/* XXX KS - by falling out here, are we writing the vn
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twice? */
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}
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--fs->lfs_diropwait;
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return lfs_vflush(vp);
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}
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return 0;
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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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/* VOP_BWRITE 1 + NIADDR + VOP_BALLOC == 2 + 2*NIADDR times */
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int
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lfs_truncate(void *v)
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{
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struct vop_truncate_args /* {
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struct vnode *a_vp;
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off_t a_length;
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int a_flags;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *ovp = ap->a_vp;
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struct genfs_node *gp = VTOG(ovp);
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daddr_t lastblock;
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struct inode *oip;
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daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
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/* XXX ondisk32 */
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int32_t newblks[NDADDR + NIADDR];
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off_t length = ap->a_length;
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struct lfs *fs;
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struct buf *bp;
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int offset, size, level;
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long count, rcount, nblocks, blocksreleased = 0, real_released = 0;
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int i;
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int aflags, error, allerror = 0;
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off_t osize;
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voff_t eoz;
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long lastseg;
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size_t bc;
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int obufsize, odb;
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int usepc;
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if (length < 0)
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return (EINVAL);
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oip = VTOI(ovp);
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/*
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* Just return and not update modification times.
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*/
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if (oip->i_size == length)
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return (0);
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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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(ovp->v_mount->mnt_maxsymlinklen == 0 &&
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oip->i_ffs1_blocks == 0))) {
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#ifdef DIAGNOSTIC
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if (length != 0)
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panic("lfs_truncate: partial truncate of symlink");
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#endif
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memset((char *)SHORTLINK(oip), 0, (u_int)oip->i_size);
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oip->i_size = oip->i_ffs1_size = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, NULL, NULL, 0));
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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, NULL, NULL, 0));
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}
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#ifdef QUOTA
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if ((error = getinoquota(oip)) != 0)
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return (error);
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#endif
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fs = oip->i_lfs;
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lfs_imtime(fs);
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osize = oip->i_size;
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usepc = (ovp->v_type == VREG && ovp != fs->lfs_ivnode);
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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 osize is 0, length will be at least 1.
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*/
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if (osize < length) {
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if (length > fs->lfs_maxfilesize)
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return (EFBIG);
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aflags = B_CLRBUF;
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if (ap->a_flags & IO_SYNC)
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aflags |= B_SYNC;
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if (usepc) {
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if (lblkno(fs, osize) < NDADDR &&
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lblkno(fs, osize) != lblkno(fs, length) &&
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blkroundup(fs, osize) != osize) {
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error = ufs_balloc_range(ovp, osize,
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blkroundup(fs, osize) -
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osize, ap->a_cred,
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aflags);
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if (error) {
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return error;
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}
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if (ap->a_flags & IO_SYNC) {
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ovp->v_size = blkroundup(fs, osize);
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simple_lock(&ovp->v_interlock);
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VOP_PUTPAGES(ovp,
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trunc_page(osize & fs->lfs_bmask),
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round_page(ovp->v_size),
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PGO_CLEANIT | PGO_SYNCIO);
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}
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}
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error = ufs_balloc_range(ovp, length - 1, 1, ap->a_cred,
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aflags);
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if (error) {
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(void) VOP_TRUNCATE(ovp, osize,
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ap->a_flags & IO_SYNC,
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ap->a_cred, ap->a_p);
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return error;
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}
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uvm_vnp_setsize(ovp, length);
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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KASSERT(ovp->v_size == oip->i_size);
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return (VOP_UPDATE(ovp, NULL, NULL, 0));
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} else {
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error = lfs_reserve(fs, ovp, NULL,
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btofsb(fs, (NIADDR + 2) << fs->lfs_bshift));
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if (error)
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return (error);
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error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred,
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aflags, &bp);
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lfs_reserve(fs, ovp, NULL,
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-btofsb(fs, (NIADDR + 2) << fs->lfs_bshift));
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if (error)
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return (error);
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oip->i_ffs1_size = oip->i_size = length;
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uvm_vnp_setsize(ovp, length);
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(void) VOP_BWRITE(bp);
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, NULL, NULL, 0));
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}
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}
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if ((error = lfs_reserve(fs, ovp, NULL,
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btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift))) != 0)
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return (error);
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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 boundary, 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 becomes accessible again because
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* of subsequent file growth. Directories however are not
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* zero'ed as they should grow back initialized to empty.
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*/
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offset = blkoff(fs, length);
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lastseg = -1;
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bc = 0;
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lfs_seglock(fs, SEGM_PROT);
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if (offset == 0) {
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oip->i_size = oip->i_ffs1_size = length;
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} else if (!usepc) {
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lbn = lblkno(fs, length);
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aflags = B_CLRBUF;
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if (ap->a_flags & IO_SYNC)
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aflags |= B_SYNC;
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error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred, aflags, &bp);
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if (error) {
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lfs_reserve(fs, ovp, NULL,
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-btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift));
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goto errout;
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}
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obufsize = bp->b_bufsize;
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odb = btofsb(fs, bp->b_bcount);
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oip->i_size = oip->i_ffs1_size = length;
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size = blksize(fs, oip, lbn);
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if (ovp->v_type != VDIR)
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memset((char *)bp->b_data + offset, 0,
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(u_int)(size - offset));
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allocbuf(bp, size);
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if ((bp->b_flags & (B_LOCKED | B_CALL)) == B_LOCKED)
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locked_queue_bytes -= obufsize - bp->b_bufsize;
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if (bp->b_flags & B_DELWRI)
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fs->lfs_avail += odb - btofsb(fs, size);
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(void) VOP_BWRITE(bp);
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} else { /* vp->v_type == VREG && length < osize && offset != 0 */
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/*
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* When truncating a regular file down to a non-block-aligned
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* size, we must zero the part of last block which is past
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* the new EOF. We must synchronously flush the zeroed pages
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* to disk since the new pages will be invalidated as soon
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* as we inform the VM system of the new, smaller size.
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* We must do this before acquiring the GLOCK, since fetching
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* the pages will acquire the GLOCK internally.
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* So there is a window where another thread could see a whole
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* zeroed page past EOF, but that's life.
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*/
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aflags = ap->a_flags & IO_SYNC ? B_SYNC : 0;
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error = ufs_balloc_range(ovp, length - 1, 1, ap->a_cred,
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aflags);
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if (error) {
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goto errout;
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}
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eoz = blkroundup(fs, length);
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uvm_vnp_zerorange(ovp, length, eoz - length);
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simple_lock(&ovp->v_interlock);
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error = VOP_PUTPAGES(ovp, trunc_page(length), round_page(eoz),
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PGO_CLEANIT | PGO_DEACTIVATE | (aflags ? PGO_SYNCIO : 0));
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if (error) {
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goto errout;
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}
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}
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lockmgr(&gp->g_glock, LK_EXCLUSIVE, NULL);
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oip->i_size = oip->i_ffs1_size = length;
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uvm_vnp_setsize(ovp, length);
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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->lfs_bsize - 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 = btofsb(fs, fs->lfs_bsize);
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/*
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* Record changed file and block pointers before we start
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* freeing blocks. lastiblock values are also normalized to -1
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* for calls to lfs_indirtrunc below.
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*/
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memcpy((caddr_t)newblks, (caddr_t)&oip->i_ffs1_db[0], sizeof newblks);
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for (level = TRIPLE; level >= SINGLE; level--)
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if (lastiblock[level] < 0) {
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newblks[NDADDR+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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newblks[i] = 0;
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oip->i_size = oip->i_ffs1_size = osize;
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error = lfs_vtruncbuf(ovp, lastblock + 1, 0, 0);
|
|
if (error && !allerror)
|
|
allerror = error;
|
|
|
|
/*
|
|
* Indirect blocks first.
|
|
*/
|
|
indir_lbn[SINGLE] = -NDADDR;
|
|
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
|
|
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
|
|
for (level = TRIPLE; level >= SINGLE; level--) {
|
|
bn = oip->i_ffs1_ib[level];
|
|
if (bn != 0) {
|
|
error = lfs_indirtrunc(oip, indir_lbn[level],
|
|
bn, lastiblock[level],
|
|
level, &count, &rcount,
|
|
&lastseg, &bc, ap->a_p);
|
|
if (error)
|
|
allerror = error;
|
|
real_released += rcount;
|
|
blocksreleased += count;
|
|
if (lastiblock[level] < 0) {
|
|
if (oip->i_ffs1_ib[level] > 0)
|
|
real_released += nblocks;
|
|
blocksreleased += nblocks;
|
|
oip->i_ffs1_ib[level] = 0;
|
|
lfs_blkfree(fs, bn, fs->lfs_bsize, &lastseg, &bc);
|
|
}
|
|
}
|
|
if (lastiblock[level] >= 0)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* All whole direct blocks or frags.
|
|
*/
|
|
for (i = NDADDR - 1; i > lastblock; i--) {
|
|
long bsize, obsize;
|
|
|
|
bn = oip->i_ffs1_db[i];
|
|
if (bn == 0)
|
|
continue;
|
|
bsize = blksize(fs, oip, i);
|
|
if (oip->i_ffs1_db[i] > 0) {
|
|
/* Check for fragment size changes */
|
|
obsize = oip->i_lfs_fragsize[i];
|
|
real_released += btofsb(fs, obsize);
|
|
oip->i_lfs_fragsize[i] = 0;
|
|
} else
|
|
obsize = 0;
|
|
blocksreleased += btofsb(fs, bsize);
|
|
oip->i_ffs1_db[i] = 0;
|
|
lfs_blkfree(fs, bn, obsize, &lastseg, &bc);
|
|
}
|
|
if (lastblock < 0)
|
|
goto done;
|
|
|
|
/*
|
|
* Finally, look for a change in size of the
|
|
* last direct block; release any frags.
|
|
*/
|
|
bn = oip->i_ffs1_db[lastblock];
|
|
if (bn != 0) {
|
|
long oldspace, newspace;
|
|
#if 0
|
|
long olddspace;
|
|
#endif
|
|
|
|
/*
|
|
* Calculate amount of space we're giving
|
|
* back as old block size minus new block size.
|
|
*/
|
|
oldspace = blksize(fs, oip, lastblock);
|
|
#if 0
|
|
olddspace = oip->i_lfs_fragsize[lastblock];
|
|
#endif
|
|
|
|
oip->i_size = oip->i_ffs1_size = length;
|
|
newspace = blksize(fs, oip, lastblock);
|
|
if (newspace == 0)
|
|
panic("itrunc: newspace");
|
|
if (oldspace - newspace > 0) {
|
|
blocksreleased += btofsb(fs, oldspace - newspace);
|
|
}
|
|
#if 0
|
|
if (bn > 0 && olddspace - newspace > 0) {
|
|
/* No segment accounting here, just vnode */
|
|
real_released += btofsb(fs, olddspace - newspace);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
done:
|
|
/* Finish segment accounting corrections */
|
|
lfs_update_seguse(fs, lastseg, bc);
|
|
#ifdef DIAGNOSTIC
|
|
for (level = SINGLE; level <= TRIPLE; level++)
|
|
if ((newblks[NDADDR + level] == 0) !=
|
|
(oip->i_ffs1_ib[level]) == 0) {
|
|
panic("lfs itrunc1");
|
|
}
|
|
for (i = 0; i < NDADDR; i++)
|
|
if ((newblks[i] == 0) != (oip->i_ffs1_db[i] == 0)) {
|
|
panic("lfs itrunc2");
|
|
}
|
|
if (length == 0 &&
|
|
(!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd)))
|
|
panic("lfs itrunc3");
|
|
#endif /* DIAGNOSTIC */
|
|
/*
|
|
* Put back the real size.
|
|
*/
|
|
oip->i_size = oip->i_ffs1_size = length;
|
|
oip->i_lfs_effnblks -= blocksreleased;
|
|
oip->i_ffs1_blocks -= real_released;
|
|
fs->lfs_bfree += blocksreleased;
|
|
#ifdef DIAGNOSTIC
|
|
if (oip->i_size == 0 && oip->i_ffs1_blocks != 0) {
|
|
printf("lfs_truncate: truncate to 0 but %d blocks on inode\n",
|
|
oip->i_ffs1_blocks);
|
|
panic("lfs_truncate: persistent blocks");
|
|
}
|
|
#endif
|
|
oip->i_flag |= IN_CHANGE;
|
|
#ifdef QUOTA
|
|
(void) chkdq(oip, -blocksreleased, NOCRED, 0);
|
|
#endif
|
|
lfs_reserve(fs, ovp, NULL,
|
|
-btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift));
|
|
lockmgr(&gp->g_glock, LK_RELEASE, NULL);
|
|
errout:
|
|
lfs_segunlock(fs);
|
|
return (allerror ? allerror : error);
|
|
}
|
|
|
|
/* Update segment usage information when removing a block. */
|
|
static int
|
|
lfs_blkfree(struct lfs *fs, daddr_t daddr, size_t bsize, long *lastseg,
|
|
size_t *num)
|
|
{
|
|
long seg;
|
|
int error = 0;
|
|
|
|
bsize = fragroundup(fs, bsize);
|
|
if (daddr > 0) {
|
|
if (*lastseg != (seg = dtosn(fs, daddr))) {
|
|
error = lfs_update_seguse(fs, *lastseg, *num);
|
|
*num = bsize;
|
|
*lastseg = seg;
|
|
} else
|
|
*num += bsize;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/* Finish the accounting updates for a segment. */
|
|
static int
|
|
lfs_update_seguse(struct lfs *fs, long lastseg, size_t num)
|
|
{
|
|
SEGUSE *sup;
|
|
struct buf *bp;
|
|
|
|
if (lastseg < 0 || num == 0)
|
|
return 0;
|
|
|
|
LFS_SEGENTRY(sup, fs, lastseg, bp);
|
|
if (num > sup->su_nbytes) {
|
|
printf("lfs_truncate: segment %ld short by %ld\n",
|
|
lastseg, (long)num - sup->su_nbytes);
|
|
panic("lfs_truncate: negative bytes");
|
|
sup->su_nbytes = num;
|
|
}
|
|
sup->su_nbytes -= num;
|
|
LFS_WRITESEGENTRY(sup, fs, lastseg, bp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Release blocks associated with the inode ip and stored in the indirect
|
|
* block bn. Blocks are free'd in LIFO order up to (but not including)
|
|
* lastbn. If level is greater than SINGLE, the block is an indirect block
|
|
* and recursive calls to indirtrunc must be used to cleanse other indirect
|
|
* blocks.
|
|
*
|
|
* NB: triple indirect blocks are untested.
|
|
*/
|
|
static int
|
|
lfs_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
|
|
daddr_t lastbn, int level, long *countp,
|
|
long *rcountp, long *lastsegp, size_t *bcp, struct proc *p)
|
|
{
|
|
int i;
|
|
struct buf *bp;
|
|
struct lfs *fs = ip->i_lfs;
|
|
int32_t *bap; /* XXX ondisk32 */
|
|
struct vnode *vp;
|
|
daddr_t nb, nlbn, last;
|
|
int32_t *copy = NULL; /* XXX ondisk32 */
|
|
long blkcount, rblkcount, factor;
|
|
int nblocks, blocksreleased = 0, real_released = 0;
|
|
int error = 0, allerror = 0;
|
|
|
|
/*
|
|
* Calculate index in current block of last
|
|
* block to be kept. -1 indicates the entire
|
|
* block so we need not calculate the index.
|
|
*/
|
|
factor = 1;
|
|
for (i = SINGLE; i < level; i++)
|
|
factor *= NINDIR(fs);
|
|
last = lastbn;
|
|
if (lastbn > 0)
|
|
last /= factor;
|
|
nblocks = btofsb(fs, fs->lfs_bsize);
|
|
/*
|
|
* Get buffer of block pointers, zero those entries corresponding
|
|
* to blocks to be free'd, and update on disk copy first. Since
|
|
* double(triple) indirect before single(double) indirect, calls
|
|
* to bmap on these blocks will fail. However, we already have
|
|
* the on disk address, so we have to set the b_blkno field
|
|
* explicitly instead of letting bread do everything for us.
|
|
*/
|
|
vp = ITOV(ip);
|
|
bp = getblk(vp, lbn, (int)fs->lfs_bsize, 0, 0);
|
|
if (bp->b_flags & (B_DONE | B_DELWRI)) {
|
|
/* Braces must be here in case trace evaluates to nothing. */
|
|
trace(TR_BREADHIT, pack(vp, fs->lfs_bsize), lbn);
|
|
} else {
|
|
trace(TR_BREADMISS, pack(vp, fs->lfs_bsize), lbn);
|
|
p->p_stats->p_ru.ru_inblock++; /* pay for read */
|
|
bp->b_flags |= B_READ;
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("lfs_indirtrunc: bad buffer size");
|
|
bp->b_blkno = fsbtodb(fs, dbn);
|
|
VOP_STRATEGY(bp);
|
|
error = biowait(bp);
|
|
}
|
|
if (error) {
|
|
brelse(bp);
|
|
*countp = *rcountp = 0;
|
|
return (error);
|
|
}
|
|
|
|
bap = (int32_t *)bp->b_data; /* XXX ondisk32 */
|
|
if (lastbn >= 0) {
|
|
MALLOC(copy, int32_t *, fs->lfs_bsize, M_TEMP, M_WAITOK);
|
|
memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->lfs_bsize);
|
|
memset((caddr_t)&bap[last + 1], 0,
|
|
/* XXX ondisk32 */
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (int32_t));
|
|
error = VOP_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) {
|
|
error = lfs_indirtrunc(ip, nlbn, nb,
|
|
(daddr_t)-1, level - 1,
|
|
&blkcount, &rblkcount,
|
|
lastsegp, bcp, p);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
real_released += rblkcount;
|
|
}
|
|
lfs_blkfree(fs, nb, fs->lfs_bsize, lastsegp, bcp);
|
|
if (bap[i] > 0)
|
|
real_released += nblocks;
|
|
blocksreleased += nblocks;
|
|
}
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = bap[i];
|
|
if (nb != 0) {
|
|
error = lfs_indirtrunc(ip, nlbn, nb,
|
|
last, level - 1, &blkcount,
|
|
&rblkcount, lastsegp, bcp, p);
|
|
if (error)
|
|
allerror = error;
|
|
real_released += rblkcount;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
|
|
if (copy != NULL) {
|
|
FREE(copy, M_TEMP);
|
|
} else {
|
|
if (bp->b_flags & B_DELWRI) {
|
|
LFS_UNLOCK_BUF(bp);
|
|
fs->lfs_avail += btofsb(fs, bp->b_bcount);
|
|
wakeup(&fs->lfs_avail);
|
|
}
|
|
bp->b_flags |= B_INVAL;
|
|
brelse(bp);
|
|
}
|
|
|
|
*countp = blocksreleased;
|
|
*rcountp = real_released;
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* Destroy any in core blocks past the truncation length.
|
|
* Inlined from vtruncbuf, so that lfs_avail could be updated.
|
|
* We take the seglock to prevent cleaning from occurring while we are
|
|
* invalidating blocks.
|
|
*/
|
|
static int
|
|
lfs_vtruncbuf(struct vnode *vp, daddr_t lbn, int slpflag, int slptimeo)
|
|
{
|
|
struct buf *bp, *nbp;
|
|
int s, error;
|
|
struct lfs *fs;
|
|
voff_t off;
|
|
|
|
off = round_page((voff_t)lbn << vp->v_mount->mnt_fs_bshift);
|
|
simple_lock(&vp->v_interlock);
|
|
error = VOP_PUTPAGES(vp, off, 0, PGO_FREE | PGO_SYNCIO);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
|
|
fs = VTOI(vp)->i_lfs;
|
|
s = splbio();
|
|
|
|
restart:
|
|
for (bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) {
|
|
nbp = LIST_NEXT(bp, b_vnbufs);
|
|
if (bp->b_lblkno < lbn)
|
|
continue;
|
|
simple_lock(&bp->b_interlock);
|
|
if (bp->b_flags & B_BUSY) {
|
|
bp->b_flags |= B_WANTED;
|
|
error = ltsleep(bp, slpflag | (PRIBIO + 1) | PNORELOCK,
|
|
"lfs_vtruncbuf", slptimeo, &bp->b_interlock);
|
|
if (error) {
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
goto restart;
|
|
}
|
|
bp->b_flags |= B_BUSY | B_INVAL | B_VFLUSH;
|
|
if (bp->b_flags & B_DELWRI) {
|
|
bp->b_flags &= ~B_DELWRI;
|
|
fs->lfs_avail += btofsb(fs, bp->b_bcount);
|
|
wakeup(&fs->lfs_avail);
|
|
}
|
|
LFS_UNLOCK_BUF(bp);
|
|
simple_unlock(&bp->b_interlock);
|
|
brelse(bp);
|
|
}
|
|
|
|
for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
|
|
nbp = LIST_NEXT(bp, b_vnbufs);
|
|
if (bp->b_lblkno < lbn)
|
|
continue;
|
|
simple_lock(&bp->b_interlock);
|
|
if (bp->b_flags & B_BUSY) {
|
|
bp->b_flags |= B_WANTED;
|
|
error = ltsleep(bp, slpflag | (PRIBIO + 1) | PNORELOCK,
|
|
"lfs_vtruncbuf", slptimeo, &bp->b_interlock);
|
|
if (error) {
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
goto restart;
|
|
}
|
|
bp->b_flags |= B_BUSY | B_INVAL | B_VFLUSH;
|
|
if (bp->b_flags & B_DELWRI) {
|
|
bp->b_flags &= ~B_DELWRI;
|
|
fs->lfs_avail += btofsb(fs, bp->b_bcount);
|
|
wakeup(&fs->lfs_avail);
|
|
}
|
|
LFS_UNLOCK_BUF(bp);
|
|
simple_unlock(&bp->b_interlock);
|
|
brelse(bp);
|
|
}
|
|
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|