7aca6291e3
As this code is not actually used by any of the existing
interfaces, it seems unlikely to break anything (famous
last words).
The internal kernel interface to manipulate these attributes
is invoked using two new IO_ flags: IO_NORMAL and IO_EXT.
These flags may be specified in the ioflags word of VOP_READ,
VOP_WRITE, and VOP_TRUNCATE. Specifying IO_NORMAL means that
you want to do I/O to the normal data part of the file and
IO_EXT means that you want to do I/O to the extended attributes
part of the file. IO_NORMAL and IO_EXT are mutually exclusive
for VOP_READ and VOP_WRITE, but may be specified individually
or together in the case of VOP_TRUNCATE. For example, when
removing a file, VOP_TRUNCATE is called with both IO_NORMAL
and IO_EXT set. For backward compatibility, if neither IO_NORMAL
nor IO_EXT is set, then IO_NORMAL is assumed.
Note that the BA_ and IO_ flags have been `merged' so that they
may both be used in the same flags word. This merger is possible
by assigning the IO_ flags to the low sixteen bits and the BA_
flags the high sixteen bits. This works because the high sixteen
bits of the IO_ word is reserved for read-ahead and help with
write clustering so will never be used for flags. This merge
lets us get away from code of the form:
if (ioflags & IO_SYNC)
flags |= BA_SYNC;
For the future, I have considered adding a new field to the
vattr structure, va_extsize. This addition could then be
exported through the stat structure to allow applications to
find out the size of the extended attribute storage and also
would provide a more standard interface for truncating them
(via VOP_SETATTR rather than VOP_TRUNCATE).
I am also contemplating adding a pathconf parameter (for
concreteness, lets call it _PC_MAX_EXTSIZE) which would
let an application determine the maximum size of the extended
atribute storage.
Sponsored by: DARPA & NAI Labs.
316 lines
6.2 KiB
C
316 lines
6.2 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/vnode.h>
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#include <sys/mount.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, td)
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struct mount *oldmnt;
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int flags;
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struct thread *td;
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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_uninitialize()
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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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ufs2_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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ufs2_daddr_t newblkno;
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ufs2_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_allocext(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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ufs2_daddr_t newblkno;
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ufs2_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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ufs2_daddr_t newblkno;
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ufs2_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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ufs2_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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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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int
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softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp, isnewblk)
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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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ino_t newinum;
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struct buf *newdirbp;
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int isnewblk;
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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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ino_t 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_flushworklist(oldmnt, countp, td)
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struct mount *oldmnt;
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int *countp;
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struct thread *td;
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{
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*countp = 0;
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return (0);
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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 thread *a_td;
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} */ *ap;
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{
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return (0);
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}
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int
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softdep_slowdown(vp)
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struct vnode *vp;
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{
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panic("softdep_slowdown called");
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}
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void
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softdep_releasefile(ip)
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struct inode *ip; /* inode with the zero effective link count */
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{
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panic("softdep_releasefile called");
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}
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int
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softdep_request_cleanup(fs, vp)
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struct fs *fs;
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struct vnode *vp;
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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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