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1) Fastpath deletions. When a file is being deleted, check to see if it was so recently created that its inode has not yet been written to disk. If so, the delete can proceed to immediately free the inode. 2) Background writes: No file or block allocations can be done while the bitmap is being written to disk. To avoid these stalls, the bitmap is copied to another buffer which is written thus leaving the original available for futher allocations. 3) Link count tracking. Constantly track the difference in i_effnlink and i_nlink so that inodes that have had no change other than i_effnlink need not be written. 4) Identify buffers with rollback dependencies so that the buffer flushing daemon can choose to skip over them.
259 lines
5.5 KiB
C
259 lines
5.5 KiB
C
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/*
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* Copyright 1998 Marshall Kirk McKusick. All Rights Reserved.
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*
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* The soft updates code is derived from the appendix of a University
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* of Michigan technical report (Gregory R. Ganger and Yale N. Patt,
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* "Soft Updates: A Solution to the Metadata Update Problem in File
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* Systems", CSE-TR-254-95, August 1995).
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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. None of the names of McKusick, Ganger, or the University of Michigan
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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 MARSHALL KIRK MCKUSICK ``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 MARSHALL KIRK MCKUSICK 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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* from: @(#)ffs_softdep_stub.c 9.1 (McKusick) 7/10/97
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* $FreeBSD$
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*/
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/*
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* Use this file as ffs_softdep.c if you do not wish the real ffs_softdep.c
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* to be included in your system. (e.g for legal reasons )
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* The real files are in /usr/src/contrib/sys/softupdates.
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* You must copy them here before you can use soft updates.
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* Read the README for legal and technical information.
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*/
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#include "opt_ffs.h"
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#if (SOFTUPDATES == 0 ) /* SOFTUPDATES not configured in, use these stubs. */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <ufs/ufs/ufs_extern.h>
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int
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softdep_flushfiles(oldmnt, flags, p)
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struct mount *oldmnt;
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int flags;
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struct proc *p;
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{
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panic("softdep_flushfiles called");
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}
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int
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softdep_mount(devvp, mp, fs, cred)
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struct vnode *devvp;
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struct mount *mp;
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struct fs *fs;
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struct ucred *cred;
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{
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return (0);
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}
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void
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softdep_initialize()
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{
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return;
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}
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void
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softdep_setup_inomapdep(bp, ip, newinum)
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struct buf *bp;
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struct inode *ip;
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ino_t newinum;
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{
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panic("softdep_setup_inomapdep called");
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}
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void
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softdep_setup_blkmapdep(bp, fs, newblkno)
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struct buf *bp;
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struct fs *fs;
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ufs_daddr_t newblkno;
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{
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panic("softdep_setup_blkmapdep called");
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}
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void
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softdep_setup_allocdirect(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
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struct inode *ip;
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ufs_lbn_t lbn;
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ufs_daddr_t newblkno;
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ufs_daddr_t oldblkno;
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long newsize;
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long oldsize;
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struct buf *bp;
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{
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panic("softdep_setup_allocdirect called");
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}
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void
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softdep_setup_allocindir_page(ip, lbn, bp, ptrno, newblkno, oldblkno, nbp)
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struct inode *ip;
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ufs_lbn_t lbn;
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struct buf *bp;
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int ptrno;
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ufs_daddr_t newblkno;
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ufs_daddr_t oldblkno;
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struct buf *nbp;
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{
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panic("softdep_setup_allocindir_page called");
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}
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void
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softdep_setup_allocindir_meta(nbp, ip, bp, ptrno, newblkno)
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struct buf *nbp;
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struct inode *ip;
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struct buf *bp;
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int ptrno;
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ufs_daddr_t newblkno;
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{
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panic("softdep_setup_allocindir_meta called");
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}
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void
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softdep_setup_freeblocks(ip, length)
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struct inode *ip;
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off_t length;
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{
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panic("softdep_setup_freeblocks called");
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}
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/* XXX needed to change this for FreeBSD.. hit poul */
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void
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softdep_freefile(pvp, ino, mode)
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struct vnode *pvp;
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ino_t ino;
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int mode;
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{
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panic("softdep_freefile called");
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}
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void
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softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp)
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struct buf *bp;
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struct inode *dp;
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off_t diroffset;
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long newinum;
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struct buf *newdirbp;
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{
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panic("softdep_setup_directory_add called");
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}
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void
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softdep_change_directoryentry_offset(dp, base, oldloc, newloc, entrysize)
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struct inode *dp;
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caddr_t base;
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caddr_t oldloc;
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caddr_t newloc;
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int entrysize;
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{
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panic("softdep_change_directoryentry_offset called");
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}
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void
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softdep_setup_remove(bp, dp, ip, isrmdir)
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struct buf *bp;
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struct inode *dp;
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struct inode *ip;
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int isrmdir;
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{
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panic("softdep_setup_remove called");
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}
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void
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softdep_setup_directory_change(bp, dp, ip, newinum, isrmdir)
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struct buf *bp;
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struct inode *dp;
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struct inode *ip;
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long newinum;
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int isrmdir;
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{
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panic("softdep_setup_directory_change called");
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}
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void
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softdep_change_linkcnt(ip)
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struct inode *ip;
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{
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panic("softdep_change_linkcnt called");
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}
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void
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softdep_load_inodeblock(ip)
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struct inode *ip;
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{
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panic("softdep_load_inodeblock called");
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}
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void
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softdep_update_inodeblock(ip, bp, waitfor)
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struct inode *ip;
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struct buf *bp;
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int waitfor;
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{
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panic("softdep_update_inodeblock called");
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}
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void
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softdep_fsync_mountdev(vp)
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struct vnode *vp;
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{
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return;
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}
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int
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softdep_sync_metadata(ap)
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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struct ucred *a_cred;
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int a_waitfor;
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struct proc *a_p;
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} */ *ap;
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{
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return (0);
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}
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#endif /* SOFTUPDATES not configured in */
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