ae266f893f
ext2_truncate(..) and by putting it under INVARIANTS ifdefs X-MFC with: r277354 MFC after: 2 weeks
530 lines
14 KiB
C
530 lines
14 KiB
C
/*-
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* modified for Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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 8.5 (Berkeley) 12/30/93
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* $FreeBSD$
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*/
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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/bio.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/rwlock.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <fs/ext2fs/inode.h>
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#include <fs/ext2fs/ext2_mount.h>
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#include <fs/ext2fs/ext2fs.h>
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#include <fs/ext2fs/fs.h>
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#include <fs/ext2fs/ext2_extern.h>
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static int ext2_indirtrunc(struct inode *, daddr_t, daddr_t,
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daddr_t, int, e4fs_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. If we write now, then clear both IN_MODIFIED and
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* IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
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* set, then wait for the write to complete.
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*/
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int
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ext2_update(struct vnode *vp, int waitfor)
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{
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struct m_ext2fs *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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ASSERT_VOP_ELOCKED(vp, "ext2_update");
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ext2_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 = ip->i_e2fs;
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if(fs->e2fs_ronly)
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return (0);
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if ((error = bread(ip->i_devvp,
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fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
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(int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
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brelse(bp);
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return (error);
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}
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ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
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EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
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if (waitfor && !DOINGASYNC(vp))
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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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ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
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struct thread *td)
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{
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struct vnode *ovp = vp;
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int32_t lastblock;
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struct inode *oip;
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int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
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uint32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
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struct m_ext2fs *fs;
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struct buf *bp;
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int offset, size, level;
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e4fs_daddr_t count, nblocks, blocksreleased = 0;
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int error, i, allerror;
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off_t osize;
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#ifdef INVARIANTS
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struct bufobj *bo;
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#endif
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oip = VTOI(ovp);
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#ifdef INVARIANTS
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bo = &ovp->v_bufobj;
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#endif
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ASSERT_VOP_LOCKED(vp, "ext2_truncate");
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if (length < 0)
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return (EINVAL);
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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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#ifdef INVARIANTS
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if (length != 0)
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panic("ext2_truncate: partial truncate of symlink");
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#endif
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bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
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oip->i_size = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (ext2_update(ovp, 1));
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}
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if (oip->i_size == length) {
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (ext2_update(ovp, 0));
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}
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fs = oip->i_e2fs;
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osize = oip->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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if (length > oip->i_e2fs->e2fs_maxfilesize)
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return (EFBIG);
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vnode_pager_setsize(ovp, length);
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offset = blkoff(fs, length - 1);
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lbn = lblkno(fs, length - 1);
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flags |= BA_CLRBUF;
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error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
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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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oip->i_size = length;
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if (bp->b_bufsize == fs->e2fs_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(ovp))
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bdwrite(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 (ext2_update(ovp, !DOINGASYNC(ovp)));
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}
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/*
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* Shorten the size of the file. If the file is not being
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* truncated to a block boundry, the contents of the
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* partial block following the end of the file must be
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* zero'ed in case it ever become accessible again because
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* of subsequent file growth.
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*/
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/* I don't understand the comment above */
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offset = blkoff(fs, length);
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if (offset == 0) {
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oip->i_size = length;
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} else {
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lbn = lblkno(fs, length);
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flags |= BA_CLRBUF;
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error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
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if (error)
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return (error);
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oip->i_size = length;
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size = blksize(fs, oip, lbn);
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bzero((char *)bp->b_data + offset, (u_int)(size - offset));
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allocbuf(bp, size);
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if (bp->b_bufsize == fs->e2fs_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(ovp))
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bdwrite(bp);
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else
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bawrite(bp);
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}
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/*
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* Calculate index into inode's block list of
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* last direct and indirect blocks (if any)
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* which we want to keep. Lastblock is -1 when
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* the file is truncated to 0.
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*/
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lastblock = lblkno(fs, length + fs->e2fs_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->e2fs_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 ext2_indirtrunc below.
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*/
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for (level = TRIPLE; level >= SINGLE; level--) {
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oldblks[NDADDR + level] = oip->i_ib[level];
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if (lastiblock[level] < 0) {
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oip->i_ib[level] = 0;
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lastiblock[level] = -1;
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}
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}
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for (i = 0; i < NDADDR; i++) {
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oldblks[i] = oip->i_db[i];
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if (i > lastblock)
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oip->i_db[i] = 0;
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}
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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allerror = ext2_update(ovp, !DOINGASYNC(ovp));
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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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for (i = 0; i < NDADDR; i++) {
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newblks[i] = oip->i_db[i];
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oip->i_db[i] = oldblks[i];
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}
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for (i = 0; i < NIADDR; i++) {
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newblks[NDADDR + i] = oip->i_ib[i];
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oip->i_ib[i] = oldblks[NDADDR + i];
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}
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oip->i_size = osize;
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error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
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if (error && (allerror == 0))
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allerror = error;
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vnode_pager_setsize(ovp, length);
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/*
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* Indirect blocks first.
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*/
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indir_lbn[SINGLE] = -NDADDR;
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indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
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indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
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for (level = TRIPLE; level >= SINGLE; level--) {
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bn = oip->i_ib[level];
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if (bn != 0) {
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error = ext2_indirtrunc(oip, indir_lbn[level],
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fsbtodb(fs, bn), lastiblock[level], level, &count);
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if (error)
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allerror = error;
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blocksreleased += count;
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if (lastiblock[level] < 0) {
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oip->i_ib[level] = 0;
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ext2_blkfree(oip, bn, fs->e2fs_fsize);
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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 = oip->i_db[i];
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if (bn == 0)
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continue;
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oip->i_db[i] = 0;
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bsize = blksize(fs, oip, i);
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ext2_blkfree(oip, bn, bsize);
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blocksreleased += btodb(bsize);
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}
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if (lastblock < 0)
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goto done;
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/*
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* Finally, look for a change in size of the
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* last direct block; release any frags.
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*/
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bn = oip->i_db[lastblock];
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if (bn != 0) {
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long oldspace, newspace;
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/*
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* Calculate amount of space we're giving
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* back as old block size minus new block size.
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*/
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oldspace = blksize(fs, oip, lastblock);
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oip->i_size = length;
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newspace = blksize(fs, oip, lastblock);
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if (newspace == 0)
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panic("ext2_truncate: newspace");
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if (oldspace - newspace > 0) {
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/*
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* Block number of space to be free'd is
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* the old block # plus the number of frags
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* required for the storage we're keeping.
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*/
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bn += numfrags(fs, newspace);
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ext2_blkfree(oip, bn, oldspace - newspace);
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blocksreleased += btodb(oldspace - newspace);
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}
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}
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done:
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#ifdef INVARIANTS
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for (level = SINGLE; level <= TRIPLE; level++)
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if (newblks[NDADDR + level] != oip->i_ib[level])
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panic("itrunc1");
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for (i = 0; i < NDADDR; i++)
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if (newblks[i] != oip->i_db[i])
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panic("itrunc2");
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BO_LOCK(bo);
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if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
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bo->bo_clean.bv_cnt != 0))
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panic("itrunc3");
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BO_UNLOCK(bo);
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#endif /* INVARIANTS */
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/*
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* Put back the real size.
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*/
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oip->i_size = length;
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if (oip->i_blocks >= blocksreleased)
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oip->i_blocks -= blocksreleased;
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else /* sanity */
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oip->i_blocks = 0;
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oip->i_flag |= IN_CHANGE;
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vnode_pager_setsize(ovp, length);
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return (allerror);
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}
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/*
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* Release blocks associated with the inode ip and stored in the indirect
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* block bn. Blocks are free'd in LIFO order up to (but not including)
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* lastbn. If level is greater than SINGLE, the block is an indirect block
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* and recursive calls to indirtrunc must be used to cleanse other indirect
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* blocks.
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*
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* NB: triple indirect blocks are untested.
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*/
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static int
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ext2_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
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daddr_t lastbn, int level, e4fs_daddr_t *countp)
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{
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struct buf *bp;
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struct m_ext2fs *fs = ip->i_e2fs;
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struct vnode *vp;
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e2fs_daddr_t *bap, *copy;
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int i, nblocks, error = 0, allerror = 0;
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e2fs_lbn_t nb, nlbn, last;
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e4fs_daddr_t blkcount, factor, blocksreleased = 0;
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/*
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* Calculate index in current block of last
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* block to be kept. -1 indicates the entire
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* block so we need not calculate the index.
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*/
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factor = 1;
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for (i = SINGLE; i < level; i++)
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factor *= NINDIR(fs);
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last = lastbn;
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if (lastbn > 0)
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last /= factor;
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nblocks = btodb(fs->e2fs_bsize);
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/*
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* Get buffer of block pointers, zero those entries corresponding
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* to blocks to be free'd, and update on disk copy first. Since
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* double(triple) indirect before single(double) indirect, calls
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* to bmap on these blocks will fail. However, we already have
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* the on disk address, so we have to set the b_blkno field
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* explicitly instead of letting bread do everything for us.
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*/
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vp = ITOV(ip);
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bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
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if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
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bp->b_iocmd = BIO_READ;
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if (bp->b_bcount > bp->b_bufsize)
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panic("ext2_indirtrunc: bad buffer size");
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bp->b_blkno = dbn;
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vfs_busy_pages(bp, 0);
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bp->b_iooffset = dbtob(bp->b_blkno);
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bstrategy(bp);
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error = bufwait(bp);
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}
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if (error) {
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brelse(bp);
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*countp = 0;
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return (error);
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}
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bap = (e2fs_daddr_t *)bp->b_data;
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copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
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bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
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bzero((caddr_t)&bap[last + 1],
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(NINDIR(fs) - (last + 1)) * sizeof(e2fs_daddr_t));
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if (last == -1)
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bp->b_flags |= B_INVAL;
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if (DOINGASYNC(vp)) {
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bdwrite(bp);
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} else {
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error = bwrite(bp);
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if (error)
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allerror = error;
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}
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bap = copy;
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/*
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* Recursively free totally unused blocks.
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*/
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for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
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i--, nlbn += factor) {
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nb = bap[i];
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if (nb == 0)
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continue;
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if (level > SINGLE) {
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if ((error = ext2_indirtrunc(ip, nlbn,
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fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
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allerror = error;
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blocksreleased += blkcount;
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}
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ext2_blkfree(ip, nb, fs->e2fs_bsize);
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blocksreleased += nblocks;
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}
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/*
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* Recursively free last partial block.
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*/
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if (level > SINGLE && lastbn >= 0) {
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last = lastbn % factor;
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nb = bap[i];
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if (nb != 0) {
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if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
last, level - 1, &blkcount)) != 0)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
free(copy, M_TEMP);
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* discard preallocated blocks
|
|
*/
|
|
int
|
|
ext2_inactive(struct vop_inactive_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
struct thread *td = ap->a_td;
|
|
int mode, error = 0;
|
|
|
|
/*
|
|
* Ignore inodes related to stale file handles.
|
|
*/
|
|
if (ip->i_mode == 0)
|
|
goto out;
|
|
if (ip->i_nlink <= 0) {
|
|
error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
|
|
ip->i_rdev = 0;
|
|
mode = ip->i_mode;
|
|
ip->i_mode = 0;
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
ext2_vfree(vp, ip->i_number, mode);
|
|
}
|
|
if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
|
|
ext2_update(vp, 0);
|
|
out:
|
|
/*
|
|
* If we are done with the inode, reclaim it
|
|
* so that it can be reused immediately.
|
|
*/
|
|
if (ip->i_mode == 0)
|
|
vrecycle(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Reclaim an inode so that it can be used for other purposes.
|
|
*/
|
|
int
|
|
ext2_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct inode *ip;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
ip = VTOI(vp);
|
|
if (ip->i_flag & IN_LAZYMOD) {
|
|
ip->i_flag |= IN_MODIFIED;
|
|
ext2_update(vp, 0);
|
|
}
|
|
vfs_hash_remove(vp);
|
|
free(vp->v_data, M_EXT2NODE);
|
|
vp->v_data = 0;
|
|
vnode_destroy_vobject(vp);
|
|
return (0);
|
|
}
|