f0728fdce1
a set of flags ("flags"). Two flags are defined, UPDATE_WAIT and
UPDATE_DIROP.
Under the old semantics, VOP_UPDATE would block if waitfor were set,
under the assumption that directory operations should be done
synchronously. At least LFS and FFS+softdep do not make this
assumption; FFS+softdep got around the problem by enclosing all relevant
calls to VOP_UPDATE in a "if(!DOINGSOFTDEP(vp))", while LFS simply
ignored waitfor, one of the reasons why NFS-serving an LFS filesystem
did not work properly.
Under the new semantics, the UPDATE_DIROP flag is a hint to the
fs-specific update routine that the call comes from a dirop routine, and
should be wait for, or not, accordingly.
Closes PR#8996.
562 lines
16 KiB
C
562 lines
16 KiB
C
/* $NetBSD: ffs_inode.c,v 1.31 2000/05/13 23:43:13 perseant Exp $ */
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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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* @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
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*/
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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_ffs.h"
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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 <vm/vm.h>
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#include <uvm/uvm_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/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ufs/ufs_bswap.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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static int ffs_indirtrunc __P((struct inode *, ufs_daddr_t, ufs_daddr_t,
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ufs_daddr_t, int, long *));
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/*
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* Update the access, modified, and inode change times as specified
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* by the IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively.
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* The IN_MODIFIED flag is used to specify that the inode needs to be
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* updated but that the times have already been set. The access
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* and modified times are taken from the second and third parameters;
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* the inode change time is always taken from the current time. If
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* UPDATE_WAIT flag is set, or UPDATE_DIROP is set and we are not doing
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* softupdates, then wait for the disk write of the inode to complete.
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*/
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int
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ffs_update(v)
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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 fs *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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struct timespec ts;
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caddr_t cp;
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int waitfor;
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if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
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return (0);
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ip = VTOI(ap->a_vp);
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TIMEVAL_TO_TIMESPEC(&time, &ts);
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FFS_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) == 0 && (ap->a_flags & UPDATE_WAIT) == 0)
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return (0);
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ip->i_flag &= ~IN_MODIFIED;
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fs = ip->i_fs;
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waitfor=0;
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if ((ap->a_flags & UPDATE_DIROP) && !DOINGSOFTDEP(ap->a_vp))
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waitfor = UPDATE_WAIT;
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waitfor |= ap->a_flags & UPDATE_WAIT;
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/*
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* Ensure that uid and gid are correct. This is a temporary
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* fix until fsck has been changed to do the update.
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*/
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if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
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ip->i_din.ffs_din.di_ouid = ip->i_ffs_uid; /* XXX */
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ip->i_din.ffs_din.di_ogid = ip->i_ffs_gid; /* XXX */
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} /* XXX */
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error = bread(ip->i_devvp,
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fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
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(int)fs->fs_bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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if (DOINGSOFTDEP(ap->a_vp))
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softdep_update_inodeblock(ip, bp, waitfor);
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else if (ip->i_ffs_effnlink != ip->i_ffs_nlink)
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panic("ffs_update: bad link cnt");
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cp = (caddr_t)bp->b_data +
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(ino_to_fsbo(fs, ip->i_number) * DINODE_SIZE);
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#ifdef FFS_EI
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if (UFS_FSNEEDSWAP(fs))
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ffs_dinode_swap(&ip->i_din.ffs_din, (struct dinode *)cp);
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else
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#endif
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memcpy(cp, &ip->i_din.ffs_din, DINODE_SIZE);
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if (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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bdwrite(bp);
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return (0);
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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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ffs_truncate(v)
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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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ufs_daddr_t lastblock;
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struct inode *oip;
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ufs_daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
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ufs_daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
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off_t length = ap->a_length;
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struct fs *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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int i;
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int aflags, error, allerror;
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off_t osize;
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if (length < 0)
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return (EINVAL);
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oip = VTOI(ovp);
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#if 1
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/*
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* XXX. Was in Kirk's patches. Is it good behavior to just
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* return and not update modification times?
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*/
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if (oip->i_ffs_size == length)
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return (0);
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#endif
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if (ovp->v_type == VLNK &&
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(oip->i_ffs_size < ovp->v_mount->mnt_maxsymlinklen ||
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(ovp->v_mount->mnt_maxsymlinklen == 0 &&
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oip->i_din.ffs_din.di_blocks == 0))) {
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#ifdef DIAGNOSTIC
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if (length != 0)
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panic("ffs_truncate: partial truncate of symlink");
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#endif
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memset((char *)&oip->i_ffs_shortlink, 0, (u_int)oip->i_ffs_size);
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oip->i_ffs_size = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (VOP_UPDATE(ovp, NULL, NULL, UPDATE_WAIT));
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}
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if (oip->i_ffs_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_fs;
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osize = oip->i_ffs_size;
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ovp->v_lasta = ovp->v_clen = ovp->v_cstart = ovp->v_lastw = 0;
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if (DOINGSOFTDEP(ovp)) {
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uvm_vnp_setsize(ovp, length);
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(void) uvm_vnp_uncache(ovp);
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if (length > 0) {
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/*
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* If a file is only partially truncated, then
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* we have to clean up the data structures
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* describing the allocation past the truncation
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* point. Finding and deallocating those structures
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* is a lot of work. Since partial truncation occurs
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* rarely, we solve the problem by syncing the file
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* so that it will have no data structures left.
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*/
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if ((error = VOP_FSYNC(ovp, ap->a_cred, FSYNC_WAIT,
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ap->a_p)) != 0)
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return (error);
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} else {
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#ifdef QUOTA
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(void) chkdq(oip, -oip->i_ffs_blocks, NOCRED, 0);
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#endif
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softdep_setup_freeblocks(oip, length);
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(void) vinvalbuf(ovp, 0, ap->a_cred, ap->a_p, 0, 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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}
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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->fs_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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error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred, aflags, &bp);
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if (error)
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return (error);
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oip->i_ffs_size = length;
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uvm_vnp_setsize(ovp, length);
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(void) uvm_vnp_uncache(ovp);
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if (aflags & B_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, NULL, NULL, UPDATE_WAIT));
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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 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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if (offset == 0) {
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oip->i_ffs_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 (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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return (error);
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oip->i_ffs_size = length;
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size = blksize(fs, oip, lbn);
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(void) uvm_vnp_uncache(ovp);
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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 (aflags & B_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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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->fs_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 = btodb(fs->fs_bsize);
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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 ffs_indirtrunc below.
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*/
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memcpy((caddr_t)oldblks, (caddr_t)&oip->i_ffs_db[0], 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_ffs_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_ffs_db[i] = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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if ((error = VOP_UPDATE(ovp, NULL, NULL, UPDATE_WAIT)) != 0)
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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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memcpy((caddr_t)newblks, (caddr_t)&oip->i_ffs_db[0], sizeof newblks);
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memcpy((caddr_t)&oip->i_ffs_db[0], (caddr_t)oldblks, sizeof oldblks);
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oip->i_ffs_size = osize;
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vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
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allerror = vinvalbuf(ovp, vflags, ap->a_cred, ap->a_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 = ufs_rw32(oip->i_ffs_ib[level], UFS_FSNEEDSWAP(fs));
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if (bn != 0) {
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error = ffs_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_ffs_ib[level] = 0;
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ffs_blkfree(oip, bn, fs->fs_bsize);
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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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long bsize;
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bn = ufs_rw32(oip->i_ffs_db[i], UFS_FSNEEDSWAP(fs));
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if (bn == 0)
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continue;
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oip->i_ffs_db[i] = 0;
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bsize = blksize(fs, oip, i);
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ffs_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 = ufs_rw32(oip->i_ffs_db[lastblock], UFS_FSNEEDSWAP(fs));
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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_ffs_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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ffs_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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#ifdef DIAGNOSTIC
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for (level = SINGLE; level <= TRIPLE; level++)
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if (newblks[NDADDR + level] != oip->i_ffs_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_ffs_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_ffs_size = length;
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oip->i_ffs_blocks -= blocksreleased;
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if (oip->i_ffs_blocks < 0) /* sanity */
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oip->i_ffs_blocks = 0;
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oip->i_flag |= IN_CHANGE;
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#ifdef 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)
|
|
* 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
|
|
ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
|
|
struct inode *ip;
|
|
ufs_daddr_t lbn, lastbn;
|
|
ufs_daddr_t dbn;
|
|
int level;
|
|
long *countp;
|
|
{
|
|
int i;
|
|
struct buf *bp;
|
|
struct fs *fs = ip->i_fs;
|
|
ufs_daddr_t *bap;
|
|
struct vnode *vp;
|
|
ufs_daddr_t *copy = NULL, nb, nlbn, last;
|
|
long blkcount, factor;
|
|
int nblocks, blocksreleased = 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 = btodb(fs->fs_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->fs_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->fs_bsize), lbn);
|
|
} else {
|
|
trace(TR_BREADMISS, pack(vp, fs->fs_bsize), lbn);
|
|
curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
|
|
bp->b_flags |= B_READ;
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("ffs_indirtrunc: bad buffer size");
|
|
bp->b_blkno = dbn;
|
|
VOP_STRATEGY(bp);
|
|
error = biowait(bp);
|
|
}
|
|
if (error) {
|
|
brelse(bp);
|
|
*countp = 0;
|
|
return (error);
|
|
}
|
|
|
|
bap = (ufs_daddr_t *)bp->b_data;
|
|
if (lastbn != -1) {
|
|
MALLOC(copy, ufs_daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK);
|
|
memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->fs_bsize);
|
|
memset((caddr_t)&bap[last + 1], 0,
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t));
|
|
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 = ufs_rw32(bap[i], UFS_FSNEEDSWAP(fs));
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
(ufs_daddr_t)-1, level - 1,
|
|
&blkcount);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
ffs_blkfree(ip, nb, fs->fs_bsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = ufs_rw32(bap[i], UFS_FSNEEDSWAP(fs));
|
|
if (nb != 0) {
|
|
error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
last, level - 1, &blkcount);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
|
|
if (copy != NULL) {
|
|
FREE(copy, M_TEMP);
|
|
} else {
|
|
bp->b_flags |= B_INVAL;
|
|
brelse(bp);
|
|
}
|
|
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|