4221e284a3
piecemeal, middle-of-file writes for NFS. These hacks have caused no end of trouble, especially when combined with mmap(). I've removed them. Instead, NFS will issue a read-before-write to fully instantiate the struct buf containing the write. NFS does, however, optimize piecemeal appends to files. For most common file operations, you will not notice the difference. The sole remaining fragment in the VFS/BIO system is b_dirtyoff/end, which NFS uses to avoid cache coherency issues with read-merge-write style operations. NFS also optimizes the write-covers-entire-buffer case by avoiding the read-before-write. There is quite a bit of room for further optimization in these areas. The VM system marks pages fully-valid (AKA vm_page_t->valid = VM_PAGE_BITS_ALL) in several places, most noteably in vm_fault. This is not correct operation. The vm_pager_get_pages() code is now responsible for marking VM pages all-valid. A number of VM helper routines have been added to aid in zeroing-out the invalid portions of a VM page prior to the page being marked all-valid. This operation is necessary to properly support mmap(). The zeroing occurs most often when dealing with file-EOF situations. Several bugs have been fixed in the NFS subsystem, including bits handling file and directory EOF situations and buf->b_flags consistancy issues relating to clearing B_ERROR & B_INVAL, and handling B_DONE. getblk() and allocbuf() have been rewritten. B_CACHE operation is now formally defined in comments and more straightforward in implementation. B_CACHE for VMIO buffers is based on the validity of the backing store. B_CACHE for non-VMIO buffers is based simply on whether the buffer is B_INVAL or not (B_CACHE set if B_INVAL clear, and vise-versa). biodone() is now responsible for setting B_CACHE when a successful read completes. B_CACHE is also set when a bdwrite() is initiated and when a bwrite() is initiated. VFS VOP_BWRITE routines (there are only two - nfs_bwrite() and bwrite()) are now expected to set B_CACHE. This means that bowrite() and bawrite() also set B_CACHE indirectly. There are a number of places in the code which were previously using buf->b_bufsize (which is DEV_BSIZE aligned) when they should have been using buf->b_bcount. These have been fixed. getblk() now clears B_DONE on return because the rest of the system is so bad about dealing with B_DONE. Major fixes to NFS/TCP have been made. A server-side bug could cause requests to be lost by the server due to nfs_realign() overwriting other rpc's in the same TCP mbuf chain. The server's kernel must be recompiled to get the benefit of the fixes. Submitted by: Matthew Dillon <dillon@apollo.backplane.com>
527 lines
15 KiB
C
527 lines
15 KiB
C
/*
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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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* $Id: ffs_inode.c,v 1.53 1999/01/28 00:57:54 dillon Exp $
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*/
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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/mount.h>
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#include <sys/proc.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/resourcevar.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/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 __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 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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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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register 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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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_LAZYMOD | IN_MODIFIED);
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if (vp->v_mount->mnt_flag & MNT_RDONLY)
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return (0);
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fs = ip->i_fs;
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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.di_ouid = ip->i_uid; /* XXX */
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ip->i_din.di_ogid = ip->i_gid; /* XXX */
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} /* XXX */
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error = bread(ip->i_devvp, 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(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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*((struct dinode *)bp->b_data +
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ino_to_fsbo(fs, ip->i_number)) = ip->i_din;
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if (waitfor && (vp->v_mount->mnt_flag & MNT_ASYNC) == 0) {
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return (bwrite(bp));
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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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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(vp, length, flags, cred, p)
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struct vnode *vp;
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off_t length;
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int flags;
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struct ucred *cred;
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struct proc *p;
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{
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register struct vnode *ovp = vp;
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ufs_daddr_t lastblock;
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register 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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register 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, blocksreleased = 0;
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register int i;
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int aflags, error, allerror;
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off_t osize;
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oip = VTOI(ovp);
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if (oip->i_size == length)
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return (0);
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fs = oip->i_fs;
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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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if (ovp->v_type == VLNK &&
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(oip->i_size < ovp->v_mount->mnt_maxsymlinklen || oip->i_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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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 (UFS_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 (UFS_UPDATE(ovp, 0));
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}
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#ifdef QUOTA
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error = getinoquota(oip);
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if (error)
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return (error);
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#endif
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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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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, cred, MNT_WAIT,
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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_blocks, NOCRED, 0);
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#endif
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softdep_setup_freeblocks(oip, length);
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vinvalbuf(ovp, 0, cred, p, 0, 0);
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (ffs_update(ovp, 0));
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}
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}
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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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vnode_pager_setsize(ovp, length);
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aflags = B_CLRBUF;
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if (flags & IO_SYNC)
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aflags |= B_SYNC;
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error = VOP_BALLOC(ovp, length - 1, 1,
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cred, aflags, &bp);
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if (error)
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return (error);
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oip->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 (aflags & B_SYNC)
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bwrite(bp);
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else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
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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 (UFS_UPDATE(ovp, 1));
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}
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/*
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* Shorten the size of the file. If the file is not being
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* truncated to a block 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_size = length;
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} else {
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lbn = lblkno(fs, length);
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aflags = B_CLRBUF;
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if (flags & IO_SYNC)
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aflags |= B_SYNC;
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error = VOP_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
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if (error) {
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return (error);
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}
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oip->i_size = length;
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size = blksize(fs, oip, lbn);
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if (ovp->v_type != VDIR)
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bzero((char *)bp->b_data + offset,
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(u_int)(size - offset));
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/* Kirk's code has reallocbuf(bp, size, 1) here */
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allocbuf(bp, size);
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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 (aflags & B_SYNC)
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bwrite(bp);
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else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
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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->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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bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
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for (level = TRIPLE; level >= SINGLE; level--)
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if (lastiblock[level] < 0) {
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oip->i_ib[level] = 0;
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lastiblock[level] = -1;
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}
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for (i = NDADDR - 1; i > lastblock; i--)
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oip->i_db[i] = 0;
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oip->i_flag |= IN_CHANGE | IN_UPDATE;
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allerror = UFS_UPDATE(ovp, ((length > 0) ? 0 : 1));
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/*
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* Having written the new inode to disk, save its new configuration
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* and put back the old block pointers long enough to process them.
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* Note that we save the new block configuration so we can check it
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* when we are done.
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*/
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bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
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bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
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oip->i_size = osize;
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error = vtruncbuf(ovp, cred, p, length, fs->fs_bsize);
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if (error && (allerror == 0))
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allerror = error;
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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 = 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_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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register long bsize;
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bn = oip->i_db[i];
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if (bn == 0)
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continue;
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oip->i_db[i] = 0;
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bsize = blksize(fs, oip, i);
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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 = 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("ffs_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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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_ib[level])
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panic("ffs_truncate1");
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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("ffs_truncate2");
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if (length == 0 &&
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(!TAILQ_EMPTY(&ovp->v_dirtyblkhd) ||
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!TAILQ_EMPTY(&ovp->v_cleanblkhd)))
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panic("ffs_truncate3");
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#endif /* DIAGNOSTIC */
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/*
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* Put back the real size.
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*/
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oip->i_size = length;
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oip->i_blocks -= blocksreleased;
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if (oip->i_blocks < 0) /* sanity */
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oip->i_blocks = 0;
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oip->i_flag |= IN_CHANGE;
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#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)
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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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ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
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register struct inode *ip;
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ufs_daddr_t lbn, lastbn;
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ufs_daddr_t dbn;
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int level;
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long *countp;
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{
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register int i;
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struct buf *bp;
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register struct fs *fs = ip->i_fs;
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register ufs_daddr_t *bap;
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struct vnode *vp;
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|
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_CACHE) == 0) {
|
|
curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
|
|
bp->b_flags |= B_READ;
|
|
bp->b_flags &= ~(B_ERROR|B_INVAL);
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("ffs_indirtrunc: bad buffer size");
|
|
bp->b_blkno = dbn;
|
|
vfs_busy_pages(bp, 0);
|
|
VOP_STRATEGY(bp->b_vp, 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);
|
|
bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize);
|
|
bzero((caddr_t)&bap[last + 1],
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t));
|
|
if ((vp->v_mount->mnt_flag & MNT_ASYNC) == 0) {
|
|
error = bwrite(bp);
|
|
if (error)
|
|
allerror = error;
|
|
} else {
|
|
bawrite(bp);
|
|
}
|
|
bap = copy;
|
|
}
|
|
|
|
/*
|
|
* Recursively free totally unused blocks.
|
|
*/
|
|
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
|
|
i--, nlbn += factor) {
|
|
nb = bap[i];
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
(ufs_daddr_t)-1, level - 1, &blkcount)) != 0)
|
|
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 = bap[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);
|
|
}
|