138 lines
4.4 KiB
Groff
138 lines
4.4 KiB
Groff
.\" $NetBSD: lfs_markv.2,v 1.1 2000/05/24 21:54:59 perseant Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Konrad Schroder.
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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 NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 23, 2000
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.Dt LFS_MARKV 2
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.Os
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.Sh NAME
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.Nm lfs_markv
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.Nd rewrite disk blocks to new disk locations
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <ufs/lfs/lfs.h>
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.Ft int
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.Fn lfs_markv "fsid_t *fsidp" "BLOCK_INFO *blkiov" "int blkcnt"
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.Sh DESCRIPTION
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.Fn lfs_markv
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rewrites the blocks specified in
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.Fa blkiov
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to new disk locations, for the purposes of grouping them next to one
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another, or to move them out of a segment to clean it. All fields of
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the BLOCK_INFO structure must be filled in, except for
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.Fa bi_segcreate.
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If
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.Fa bi_daddr
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is not the correct current address for logical block
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.Fa bi_lbn
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of the file with inode number
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.Fa bi_inode,
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or if the file's version number does not match
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.Fa bi_version,
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the block will not be written to disk, but no error will be returned.
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.Pp
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The
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.Fa fsidp
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argument contains the id of the filesystem to which the inodes and
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blocks belong.
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The
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.Fa bi_bp
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field contains
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.Fa bi_size
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bytes of data to be written into the appropriate block.
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If
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.Fa bi_lbn
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is specified as LFS_UNUSED_LBN, the inode itself will be rewritten.
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.Pp
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The
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.Fa blkiov
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argument is an array of BLOCK_INFO structures (see below). The
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.Fa blkcnt
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argument determines the size of the
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.Fa blkiov
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array.
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.Bd -literal
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typedef struct block_info {
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ino_t bi_inode; /* inode # */
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ufs_daddr_t bi_lbn; /* logical block w/in file */
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ufs_daddr_t bi_daddr; /* disk address of block */
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time_t bi_segcreate; /* origin segment create time */
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int bi_version; /* file version number */
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void *bi_bp; /* data buffer */
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int bi_size; /* size of the block (if fragment) */
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} BLOCK_INFO;
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.Ed
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.Sh RETURN VALUES
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.Fn lfs_markv
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returns 0 on success, or -1 on error.
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.Sh ERRORS
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An error return from
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.Fn lfs_markv
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indicates:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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.Fa fsidp
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points outside the process's allocated address space.
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.It Bq Er EINVAL
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.Fa *fsidp
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does not specify a valid filesystem.
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.It Bq Er EBUSY
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One or more of the inodes whose blocks were to be written was locked,
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and its blocks were not rewritten.
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.El
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.Sh SEE ALSO
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.Xr lfs_cleanerd 8 ,
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.Xr lfs_markv 2 ,
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.Xr lfs_segclean 2 ,
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.Xr lfs_segwait 2
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.Sh BUGS
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The functionality of
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.Fn lfs_markv
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does not really belong in user space. Among other things it could be
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used to work around the
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SF_IMMUTABLE
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and
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SF_APPEND
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file flags (see
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.Xr chflags 2
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).
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.Sh HISTORY
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The
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.Fn lfs_bmapv
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function call appeared in
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.Bx 4.4 .
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