621a274820
hidden bug in the file truncation code. Until that bug is tracked down and fixed, revert to the old behavior. Reported by: Peter Holm Reviewed by: kib, Chuck Silvers
772 lines
23 KiB
C
772 lines
23 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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. 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_quota.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/random.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/stat.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_object.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.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 <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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static int ffs_indirtrunc(struct inode *, ufs2_daddr_t, ufs2_daddr_t,
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ufs2_daddr_t, int, ufs2_daddr_t *);
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/*
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* Update the access, modified, and inode change times as specified by the
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* IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
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* to disk if the IN_MODIFIED flag is set (it may be set initially, or by
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* the timestamp update). The IN_LAZYMOD flag is set to force a write
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* later if not now. The IN_LAZYACCESS is set instead of IN_MODIFIED if the fs
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* is currently being suspended (or is suspended) and vnode has been accessed.
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* If we write now, then clear IN_MODIFIED, IN_LAZYACCESS and IN_LAZYMOD to
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* reflect the presumably successful write, and if waitfor is set, then wait
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* for the write to complete.
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*/
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int
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ffs_update(vp, waitfor)
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struct vnode *vp;
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int waitfor;
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{
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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 flags, error;
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ASSERT_VOP_ELOCKED(vp, "ffs_update");
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ufs_itimes(vp);
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ip = VTOI(vp);
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if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
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return (0);
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ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
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fs = ITOFS(ip);
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if (fs->fs_ronly && ITOUMP(ip)->um_fsckpid == 0)
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return (0);
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/*
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* If we are updating a snapshot and another process is currently
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* writing the buffer containing the inode for this snapshot then
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* a deadlock can occur when it tries to check the snapshot to see
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* if that block needs to be copied. Thus when updating a snapshot
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* we check to see if the buffer is already locked, and if it is
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* we drop the snapshot lock until the buffer has been written
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* and is available to us. We have to grab a reference to the
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* snapshot vnode to prevent it from being removed while we are
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* waiting for the buffer.
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*/
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flags = 0;
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if (IS_SNAPSHOT(ip))
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flags = GB_LOCK_NOWAIT;
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loop:
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error = bread_gb(ITODEVVP(ip),
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fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
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(int) fs->fs_bsize, NOCRED, flags, &bp);
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if (error != 0) {
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if (error != EBUSY)
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return (error);
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KASSERT((IS_SNAPSHOT(ip)), ("EBUSY from non-snapshot"));
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/*
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* Wait for our inode block to become available.
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*
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* Hold a reference to the vnode to protect against
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* ffs_snapgone(). Since we hold a reference, it can only
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* get reclaimed (VIRF_DOOMED flag) in a forcible downgrade
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* or unmount. For an unmount, the entire filesystem will be
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* gone, so we cannot attempt to touch anything associated
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* with it while the vnode is unlocked; all we can do is
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* pause briefly and try again. If when we relock the vnode
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* we discover that it has been reclaimed, updating it is no
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* longer necessary and we can just return an error.
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*/
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vref(vp);
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VOP_UNLOCK(vp);
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pause("ffsupd", 1);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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vrele(vp);
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if (VN_IS_DOOMED(vp))
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return (ENOENT);
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goto loop;
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}
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if (DOINGSOFTDEP(vp))
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softdep_update_inodeblock(ip, bp, waitfor);
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else if (ip->i_effnlink != ip->i_nlink)
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panic("ffs_update: bad link cnt");
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if (I_IS_UFS1(ip)) {
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*((struct ufs1_dinode *)bp->b_data +
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ino_to_fsbo(fs, ip->i_number)) = *ip->i_din1;
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/*
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* XXX: FIX? The entropy here is desirable,
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* but the harvesting may be expensive
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*/
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random_harvest_queue(&(ip->i_din1), sizeof(ip->i_din1), RANDOM_FS_ATIME);
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} else {
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ffs_update_dinode_ckhash(fs, ip->i_din2);
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*((struct ufs2_dinode *)bp->b_data +
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ino_to_fsbo(fs, ip->i_number)) = *ip->i_din2;
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/*
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* XXX: FIX? The entropy here is desirable,
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* but the harvesting may be expensive
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*/
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random_harvest_queue(&(ip->i_din2), sizeof(ip->i_din2), RANDOM_FS_ATIME);
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}
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if (waitfor)
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error = bwrite(bp);
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else if (vm_page_count_severe() || buf_dirty_count_severe()) {
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bawrite(bp);
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error = 0;
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} else {
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if (bp->b_bufsize == fs->fs_bsize)
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bp->b_flags |= B_CLUSTEROK;
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bdwrite(bp);
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error = 0;
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}
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return (error);
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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 ip 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(vp, length, flags, cred)
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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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{
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struct inode *ip;
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ufs2_daddr_t bn, lbn, lastblock, lastiblock[UFS_NIADDR];
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ufs2_daddr_t indir_lbn[UFS_NIADDR], oldblks[UFS_NDADDR + UFS_NIADDR];
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ufs2_daddr_t newblks[UFS_NDADDR + UFS_NIADDR];
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ufs2_daddr_t count, blocksreleased = 0, datablocks, blkno;
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struct bufobj *bo;
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struct fs *fs;
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struct buf *bp;
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struct ufsmount *ump;
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int softdeptrunc, journaltrunc;
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int needextclean, extblocks;
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int offset, size, level, nblocks;
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int i, error, allerror, indiroff, waitforupdate;
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u_long key;
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off_t osize;
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ip = VTOI(vp);
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ump = VFSTOUFS(vp->v_mount);
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fs = ump->um_fs;
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bo = &vp->v_bufobj;
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ASSERT_VOP_LOCKED(vp, "ffs_truncate");
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if (length < 0)
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return (EINVAL);
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if (length > fs->fs_maxfilesize)
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return (EFBIG);
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#ifdef QUOTA
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error = getinoquota(ip);
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if (error)
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return (error);
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#endif
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/*
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* Historically clients did not have to specify which data
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* they were truncating. So, if not specified, we assume
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* traditional behavior, e.g., just the normal data.
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*/
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if ((flags & (IO_EXT | IO_NORMAL)) == 0)
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flags |= IO_NORMAL;
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if (!DOINGSOFTDEP(vp) && !DOINGASYNC(vp))
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flags |= IO_SYNC;
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waitforupdate = (flags & IO_SYNC) != 0 || !DOINGASYNC(vp);
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/*
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* If we are truncating the extended-attributes, and cannot
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* do it with soft updates, then do it slowly here. If we are
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* truncating both the extended attributes and the file contents
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* (e.g., the file is being unlinked), then pick it off with
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* soft updates below.
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*/
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allerror = 0;
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needextclean = 0;
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softdeptrunc = 0;
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journaltrunc = DOINGSUJ(vp);
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journaltrunc = 0; /* XXX temp patch until bug found */
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if (journaltrunc == 0 && DOINGSOFTDEP(vp) && length == 0)
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softdeptrunc = !softdep_slowdown(vp);
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extblocks = 0;
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datablocks = DIP(ip, i_blocks);
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if (fs->fs_magic == FS_UFS2_MAGIC && ip->i_din2->di_extsize > 0) {
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extblocks = btodb(fragroundup(fs, ip->i_din2->di_extsize));
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datablocks -= extblocks;
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}
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if ((flags & IO_EXT) && extblocks > 0) {
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if (length != 0)
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panic("ffs_truncate: partial trunc of extdata");
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if (softdeptrunc || journaltrunc) {
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if ((flags & IO_NORMAL) == 0)
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goto extclean;
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needextclean = 1;
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} else {
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if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
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return (error);
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#ifdef QUOTA
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(void) chkdq(ip, -extblocks, NOCRED, FORCE);
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#endif
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vinvalbuf(vp, V_ALT, 0, 0);
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vn_pages_remove(vp,
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OFF_TO_IDX(lblktosize(fs, -extblocks)), 0);
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osize = ip->i_din2->di_extsize;
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ip->i_din2->di_blocks -= extblocks;
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ip->i_din2->di_extsize = 0;
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for (i = 0; i < UFS_NXADDR; i++) {
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oldblks[i] = ip->i_din2->di_extb[i];
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ip->i_din2->di_extb[i] = 0;
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}
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UFS_INODE_SET_FLAG(ip, IN_CHANGE);
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if ((error = ffs_update(vp, waitforupdate)))
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return (error);
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for (i = 0; i < UFS_NXADDR; i++) {
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if (oldblks[i] == 0)
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continue;
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ffs_blkfree(ump, fs, ITODEVVP(ip), oldblks[i],
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sblksize(fs, osize, i), ip->i_number,
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vp->v_type, NULL, SINGLETON_KEY);
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}
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}
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}
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if ((flags & IO_NORMAL) == 0)
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return (0);
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if (vp->v_type == VLNK &&
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(ip->i_size < vp->v_mount->mnt_maxsymlinklen ||
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datablocks == 0)) {
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#ifdef INVARIANTS
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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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bzero(SHORTLINK(ip), (u_int)ip->i_size);
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ip->i_size = 0;
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DIP_SET(ip, i_size, 0);
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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if (needextclean)
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goto extclean;
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return (ffs_update(vp, waitforupdate));
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}
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if (ip->i_size == length) {
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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if (needextclean)
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goto extclean;
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return (ffs_update(vp, 0));
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}
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if (fs->fs_ronly)
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panic("ffs_truncate: read-only filesystem");
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if (IS_SNAPSHOT(ip))
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ffs_snapremove(vp);
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vp->v_lasta = vp->v_clen = vp->v_cstart = vp->v_lastw = 0;
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osize = ip->i_size;
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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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vnode_pager_setsize(vp, length);
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flags |= BA_CLRBUF;
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error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
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if (error) {
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vnode_pager_setsize(vp, osize);
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return (error);
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}
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ip->i_size = length;
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DIP_SET(ip, i_size, length);
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if (bp->b_bufsize == fs->fs_bsize)
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bp->b_flags |= B_CLUSTEROK;
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if (flags & IO_SYNC)
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bwrite(bp);
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else if (DOINGASYNC(vp))
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bdwrite(bp);
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else
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bawrite(bp);
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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return (ffs_update(vp, waitforupdate));
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}
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/*
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* Lookup block number for a given offset. Zero length files
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* have no blocks, so return a blkno of -1.
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*/
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lbn = lblkno(fs, length - 1);
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if (length == 0) {
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blkno = -1;
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} else if (lbn < UFS_NDADDR) {
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blkno = DIP(ip, i_db[lbn]);
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} else {
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error = UFS_BALLOC(vp, lblktosize(fs, (off_t)lbn), fs->fs_bsize,
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cred, BA_METAONLY, &bp);
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if (error)
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return (error);
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indiroff = (lbn - UFS_NDADDR) % NINDIR(fs);
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if (I_IS_UFS1(ip))
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blkno = ((ufs1_daddr_t *)(bp->b_data))[indiroff];
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else
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blkno = ((ufs2_daddr_t *)(bp->b_data))[indiroff];
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/*
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* If the block number is non-zero, then the indirect block
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* must have been previously allocated and need not be written.
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* If the block number is zero, then we may have allocated
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* the indirect block and hence need to write it out.
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*/
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if (blkno != 0)
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brelse(bp);
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else if (flags & IO_SYNC)
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bwrite(bp);
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else
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bdwrite(bp);
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}
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/*
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* If the block number at the new end of the file is zero,
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* then we must allocate it to ensure that the last block of
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* the file is allocated. Soft updates does not handle this
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* case, so here we have to clean up the soft updates data
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* structures describing the allocation past the truncation
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* point. Finding and deallocating those structures is a lot of
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* work. Since partial truncation with a hole at the end occurs
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* rarely, we solve the problem by syncing the file so that it
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* will have no soft updates data structures left.
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*/
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if (blkno == 0 && (error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
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return (error);
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if (blkno != 0 && DOINGSOFTDEP(vp)) {
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if (softdeptrunc == 0 && journaltrunc == 0) {
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/*
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* If soft updates cannot handle this truncation,
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* clean up soft dependency data structures and
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* fall through to the synchronous truncation.
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*/
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if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
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return (error);
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} else {
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flags = IO_NORMAL | (needextclean ? IO_EXT: 0);
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if (journaltrunc)
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softdep_journal_freeblocks(ip, cred, length,
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flags);
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else
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softdep_setup_freeblocks(ip, length, flags);
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ASSERT_VOP_LOCKED(vp, "ffs_truncate1");
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if (journaltrunc == 0) {
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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error = ffs_update(vp, 0);
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}
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return (error);
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}
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}
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/*
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* Shorten the size of the file. If the last block of the
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* shortened file is unallocated, we must allocate it.
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* Additionally, if the file is not being truncated to a
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* block boundary, the contents of the partial block
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* following the end of the file must be zero'ed in
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* case it ever becomes accessible again because of
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* 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 (blkno != 0 && offset == 0) {
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ip->i_size = length;
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DIP_SET(ip, i_size, length);
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} else {
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lbn = lblkno(fs, length);
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flags |= BA_CLRBUF;
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error = UFS_BALLOC(vp, length - 1, 1, cred, flags, &bp);
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if (error)
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return (error);
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/*
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* When we are doing soft updates and the UFS_BALLOC
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* above fills in a direct block hole with a full sized
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* block that will be truncated down to a fragment below,
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* we must flush out the block dependency with an FSYNC
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* so that we do not get a soft updates inconsistency
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* when we create the fragment below.
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*/
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if (DOINGSOFTDEP(vp) && lbn < UFS_NDADDR &&
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fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize &&
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(error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0)
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return (error);
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ip->i_size = length;
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DIP_SET(ip, i_size, length);
|
|
size = blksize(fs, ip, lbn);
|
|
if (vp->v_type != VDIR && offset != 0)
|
|
bzero((char *)bp->b_data + offset,
|
|
(u_int)(size - offset));
|
|
/* Kirk's code has reallocbuf(bp, size, 1) here */
|
|
allocbuf(bp, size);
|
|
if (bp->b_bufsize == fs->fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
if (flags & IO_SYNC)
|
|
bwrite(bp);
|
|
else if (DOINGASYNC(vp))
|
|
bdwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
}
|
|
/*
|
|
* Calculate index into inode's block list of
|
|
* last direct and indirect blocks (if any)
|
|
* which we want to keep. Lastblock is -1 when
|
|
* the file is truncated to 0.
|
|
*/
|
|
lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
|
|
lastiblock[SINGLE] = lastblock - UFS_NDADDR;
|
|
lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
|
|
lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
|
|
nblocks = btodb(fs->fs_bsize);
|
|
/*
|
|
* Update file and block pointers on disk before we start freeing
|
|
* blocks. If we crash before free'ing blocks below, the blocks
|
|
* will be returned to the free list. lastiblock values are also
|
|
* normalized to -1 for calls to ffs_indirtrunc below.
|
|
*/
|
|
for (level = TRIPLE; level >= SINGLE; level--) {
|
|
oldblks[UFS_NDADDR + level] = DIP(ip, i_ib[level]);
|
|
if (lastiblock[level] < 0) {
|
|
DIP_SET(ip, i_ib[level], 0);
|
|
lastiblock[level] = -1;
|
|
}
|
|
}
|
|
for (i = 0; i < UFS_NDADDR; i++) {
|
|
oldblks[i] = DIP(ip, i_db[i]);
|
|
if (i > lastblock)
|
|
DIP_SET(ip, i_db[i], 0);
|
|
}
|
|
UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
|
|
allerror = ffs_update(vp, waitforupdate);
|
|
|
|
/*
|
|
* Having written the new inode to disk, save its new configuration
|
|
* and put back the old block pointers long enough to process them.
|
|
* Note that we save the new block configuration so we can check it
|
|
* when we are done.
|
|
*/
|
|
for (i = 0; i < UFS_NDADDR; i++) {
|
|
newblks[i] = DIP(ip, i_db[i]);
|
|
DIP_SET(ip, i_db[i], oldblks[i]);
|
|
}
|
|
for (i = 0; i < UFS_NIADDR; i++) {
|
|
newblks[UFS_NDADDR + i] = DIP(ip, i_ib[i]);
|
|
DIP_SET(ip, i_ib[i], oldblks[UFS_NDADDR + i]);
|
|
}
|
|
ip->i_size = osize;
|
|
DIP_SET(ip, i_size, osize);
|
|
|
|
error = vtruncbuf(vp, length, fs->fs_bsize);
|
|
if (error && (allerror == 0))
|
|
allerror = error;
|
|
|
|
/*
|
|
* Indirect blocks first.
|
|
*/
|
|
indir_lbn[SINGLE] = -UFS_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 = DIP(ip, i_ib[level]);
|
|
if (bn != 0) {
|
|
error = ffs_indirtrunc(ip, indir_lbn[level],
|
|
fsbtodb(fs, bn), lastiblock[level], level, &count);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += count;
|
|
if (lastiblock[level] < 0) {
|
|
DIP_SET(ip, i_ib[level], 0);
|
|
ffs_blkfree(ump, fs, ump->um_devvp, bn,
|
|
fs->fs_bsize, ip->i_number,
|
|
vp->v_type, NULL, SINGLETON_KEY);
|
|
blocksreleased += nblocks;
|
|
}
|
|
}
|
|
if (lastiblock[level] >= 0)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* All whole direct blocks or frags.
|
|
*/
|
|
key = ffs_blkrelease_start(ump, ump->um_devvp, ip->i_number);
|
|
for (i = UFS_NDADDR - 1; i > lastblock; i--) {
|
|
long bsize;
|
|
|
|
bn = DIP(ip, i_db[i]);
|
|
if (bn == 0)
|
|
continue;
|
|
DIP_SET(ip, i_db[i], 0);
|
|
bsize = blksize(fs, ip, i);
|
|
ffs_blkfree(ump, fs, ump->um_devvp, bn, bsize, ip->i_number,
|
|
vp->v_type, NULL, key);
|
|
blocksreleased += btodb(bsize);
|
|
}
|
|
ffs_blkrelease_finish(ump, key);
|
|
if (lastblock < 0)
|
|
goto done;
|
|
|
|
/*
|
|
* Finally, look for a change in size of the
|
|
* last direct block; release any frags.
|
|
*/
|
|
bn = DIP(ip, i_db[lastblock]);
|
|
if (bn != 0) {
|
|
long oldspace, newspace;
|
|
|
|
/*
|
|
* Calculate amount of space we're giving
|
|
* back as old block size minus new block size.
|
|
*/
|
|
oldspace = blksize(fs, ip, lastblock);
|
|
ip->i_size = length;
|
|
DIP_SET(ip, i_size, length);
|
|
newspace = blksize(fs, ip, lastblock);
|
|
if (newspace == 0)
|
|
panic("ffs_truncate: newspace");
|
|
if (oldspace - newspace > 0) {
|
|
/*
|
|
* Block number of space to be free'd is
|
|
* the old block # plus the number of frags
|
|
* required for the storage we're keeping.
|
|
*/
|
|
bn += numfrags(fs, newspace);
|
|
ffs_blkfree(ump, fs, ump->um_devvp, bn,
|
|
oldspace - newspace, ip->i_number, vp->v_type,
|
|
NULL, SINGLETON_KEY);
|
|
blocksreleased += btodb(oldspace - newspace);
|
|
}
|
|
}
|
|
done:
|
|
#ifdef INVARIANTS
|
|
for (level = SINGLE; level <= TRIPLE; level++)
|
|
if (newblks[UFS_NDADDR + level] != DIP(ip, i_ib[level]))
|
|
panic("ffs_truncate1: level %d newblks %jd != i_ib %jd",
|
|
level, (intmax_t)newblks[UFS_NDADDR + level],
|
|
(intmax_t)DIP(ip, i_ib[level]));
|
|
for (i = 0; i < UFS_NDADDR; i++)
|
|
if (newblks[i] != DIP(ip, i_db[i]))
|
|
panic("ffs_truncate2: blkno %d newblks %jd != i_db %jd",
|
|
i, (intmax_t)newblks[UFS_NDADDR + level],
|
|
(intmax_t)DIP(ip, i_ib[level]));
|
|
BO_LOCK(bo);
|
|
if (length == 0 &&
|
|
(fs->fs_magic != FS_UFS2_MAGIC || ip->i_din2->di_extsize == 0) &&
|
|
(bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0))
|
|
panic("ffs_truncate3: vp = %p, buffers: dirty = %d, clean = %d",
|
|
vp, bo->bo_dirty.bv_cnt, bo->bo_clean.bv_cnt);
|
|
BO_UNLOCK(bo);
|
|
#endif /* INVARIANTS */
|
|
/*
|
|
* Put back the real size.
|
|
*/
|
|
ip->i_size = length;
|
|
DIP_SET(ip, i_size, length);
|
|
if (DIP(ip, i_blocks) >= blocksreleased)
|
|
DIP_SET(ip, i_blocks, DIP(ip, i_blocks) - blocksreleased);
|
|
else /* sanity */
|
|
DIP_SET(ip, i_blocks, 0);
|
|
UFS_INODE_SET_FLAG(ip, IN_CHANGE);
|
|
#ifdef QUOTA
|
|
(void) chkdq(ip, -blocksreleased, NOCRED, FORCE);
|
|
#endif
|
|
return (allerror);
|
|
|
|
extclean:
|
|
if (journaltrunc)
|
|
softdep_journal_freeblocks(ip, cred, length, IO_EXT);
|
|
else
|
|
softdep_setup_freeblocks(ip, length, IO_EXT);
|
|
return (ffs_update(vp, waitforupdate));
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
|
|
struct inode *ip;
|
|
ufs2_daddr_t lbn, lastbn;
|
|
ufs2_daddr_t dbn;
|
|
int level;
|
|
ufs2_daddr_t *countp;
|
|
{
|
|
struct buf *bp;
|
|
struct fs *fs;
|
|
struct ufsmount *ump;
|
|
struct vnode *vp;
|
|
caddr_t copy = NULL;
|
|
u_long key;
|
|
int i, nblocks, error = 0, allerror = 0;
|
|
ufs2_daddr_t nb, nlbn, last;
|
|
ufs2_daddr_t blkcount, factor, blocksreleased = 0;
|
|
ufs1_daddr_t *bap1 = NULL;
|
|
ufs2_daddr_t *bap2 = NULL;
|
|
#define BAP(ip, i) (I_IS_UFS1(ip) ? bap1[i] : bap2[i])
|
|
|
|
fs = ITOFS(ip);
|
|
ump = ITOUMP(ip);
|
|
|
|
/*
|
|
* Calculate index in current block of last
|
|
* block to be kept. -1 indicates the entire
|
|
* block so we need not calculate the index.
|
|
*/
|
|
factor = lbn_offset(fs, level);
|
|
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 VOP_BMAP() on these blocks will fail. However, we already
|
|
* have the on-disk address, so we just pass it to bread() instead
|
|
* of having bread() attempt to calculate it using VOP_BMAP().
|
|
*/
|
|
vp = ITOV(ip);
|
|
error = breadn_flags(vp, lbn, dbn, (int)fs->fs_bsize, NULL, NULL, 0,
|
|
NOCRED, 0, NULL, &bp);
|
|
if (error) {
|
|
*countp = 0;
|
|
return (error);
|
|
}
|
|
|
|
if (I_IS_UFS1(ip))
|
|
bap1 = (ufs1_daddr_t *)bp->b_data;
|
|
else
|
|
bap2 = (ufs2_daddr_t *)bp->b_data;
|
|
if (lastbn != -1) {
|
|
copy = malloc(fs->fs_bsize, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)bp->b_data, copy, (u_int)fs->fs_bsize);
|
|
for (i = last + 1; i < NINDIR(fs); i++)
|
|
if (I_IS_UFS1(ip))
|
|
bap1[i] = 0;
|
|
else
|
|
bap2[i] = 0;
|
|
if (DOINGASYNC(vp)) {
|
|
bdwrite(bp);
|
|
} else {
|
|
error = bwrite(bp);
|
|
if (error)
|
|
allerror = error;
|
|
}
|
|
if (I_IS_UFS1(ip))
|
|
bap1 = (ufs1_daddr_t *)copy;
|
|
else
|
|
bap2 = (ufs2_daddr_t *)copy;
|
|
}
|
|
|
|
/*
|
|
* Recursively free totally unused blocks.
|
|
*/
|
|
key = ffs_blkrelease_start(ump, ITODEVVP(ip), ip->i_number);
|
|
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
|
|
i--, nlbn += factor) {
|
|
nb = BAP(ip, i);
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
(ufs2_daddr_t)-1, level - 1, &blkcount)) != 0)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
ffs_blkfree(ump, fs, ITODEVVP(ip), nb, fs->fs_bsize,
|
|
ip->i_number, vp->v_type, NULL, key);
|
|
blocksreleased += nblocks;
|
|
}
|
|
ffs_blkrelease_finish(ump, key);
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = BAP(ip, i);
|
|
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 | B_NOCACHE;
|
|
brelse(bp);
|
|
}
|
|
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|
|
|
|
int
|
|
ffs_rdonly(struct inode *ip)
|
|
{
|
|
|
|
return (ITOFS(ip)->fs_ronly != 0);
|
|
}
|
|
|