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* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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* For further information regarding this notice, see:
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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* An on-disk allocation group header is composed of 4 structures,
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* each of which is 1 disk sector long where the sector size is at
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* least 512 bytes long (BBSIZE).
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* There's one ag_header per ag and the superblock in the first ag
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* is the contains the real data for the entire filesystem (although
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* most of the relevant data won't change anyway even on a growfs).
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* The filesystem superblock specifies the number of AG's and
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* the AG size. That splits the filesystem up into N pieces,
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* each of which is an AG and has an ag_header at the beginning.
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typedef struct ag_header {
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xfs_sb_t *xfs_sb; /* superblock for filesystem or AG */
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xfs_agf_t *xfs_agf; /* free space info */
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xfs_agi_t *xfs_agi; /* free inode info */
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xfs_agfl_t *xfs_agfl; /* AG freelist */
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* The position/buf_position, length/buf_length, data/buffer pairs
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* exist because of alignment constraints for direct I/O and dealing
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* with scenarios where either the source or target or both is a file
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* and the blocksize of the filesystem where file resides is different
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* from that of the filesystem image being duplicated. You can get
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* alignment problems resulting from things like AG's starting on
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* non-aligned points in the filesystem. So you have to be able
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* to read from points "before" the requested starting point and
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* read in more data than requested.
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int id; /* buffer ID */
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size_t size; /* size of buffer -- fixed */
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size_t min_io_size; /* for direct I/O */
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xfs_off_t position; /* requested position (bytes) */
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size_t length; /* requested length (bytes) */
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char *data; /* pointer to data buffer */
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struct t_args *owner; /* for non-parallel writes */
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typedef struct t_args {
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pthread_mutex_t mutex;
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typedef int thread_id;
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typedef int tm_index; /* index into thread mask array */
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typedef __uint32_t thread_mask; /* a thread mask */
added
removed
copy/xfs_copy.h
