155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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*
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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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*
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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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*
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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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*
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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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*
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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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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_RW_H__
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#define __XFS_RW_H__
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struct xfs_buf;
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struct xfs_inode;
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struct xfs_mount;
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/*
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* Maximum count of bmaps used by read and write paths.
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*/
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#define XFS_MAX_RW_NBMAPS 4
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/*
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* Counts of readahead buffers to use based on physical memory size.
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* None of these should be more than XFS_MAX_RW_NBMAPS.
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*/
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#define XFS_RW_NREADAHEAD_16MB 2
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#define XFS_RW_NREADAHEAD_32MB 3
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#define XFS_RW_NREADAHEAD_K32 4
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#define XFS_RW_NREADAHEAD_K64 4
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/*
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* Maximum size of a buffer that we\'ll map. Making this
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* too big will degrade performance due to the number of
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* pages which need to be gathered. Making it too small
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* will prevent us from doing large I/O\'s to hardware that
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* needs it.
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*
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* This is currently set to 512 KB.
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*/
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#define XFS_MAX_BMAP_LEN_BB 1024
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#define XFS_MAX_BMAP_LEN_BYTES 524288
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/*
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* Convert the given file system block to a disk block.
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* We have to treat it differently based on whether the
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* file is a real time file or not, because the bmap code
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* does.
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*/
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_DB)
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xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
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#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
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#else
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#define XFS_FSB_TO_DB(ip,fsb) \
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(((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
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(xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
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XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)))
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#endif
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#define XFS_FSB_TO_DB_IO(io,fsb) \
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(((io)->io_flags & XFS_IOCORE_RT) ? \
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XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
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XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
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/*
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* Prototypes for functions in xfs_rw.c.
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*/
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int
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xfs_write_clear_setuid(
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struct xfs_inode *ip);
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int
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xfs_bwrite(
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struct xfs_mount *mp,
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struct xfs_buf *bp);
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int
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xfs_bioerror(
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struct xfs_buf *b);
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int
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xfs_bioerror_relse(
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struct xfs_buf *b);
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int
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xfs_read_buf(
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struct xfs_mount *mp,
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xfs_buftarg_t *target,
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xfs_daddr_t blkno,
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int len,
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uint flags,
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struct xfs_buf **bpp);
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void
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xfs_ioerror_alert(
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char *func,
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struct xfs_mount *mp,
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xfs_buf_t *bp,
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xfs_daddr_t blkno);
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/*
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* Prototypes for functions in xfs_vnodeops.c.
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*/
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int
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xfs_rwlock(
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bhv_desc_t *bdp,
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vrwlock_t write_lock);
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void
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xfs_rwunlock(
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bhv_desc_t *bdp,
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vrwlock_t write_lock);
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int
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xfs_change_file_space(
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bhv_desc_t *bdp,
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int cmd,
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xfs_flock64_t *bf,
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xfs_off_t offset,
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cred_t *credp,
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int flags);
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int
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xfs_set_dmattrs(
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bhv_desc_t *bdp,
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u_int evmask,
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u_int16_t state,
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cred_t *credp);
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#endif /* __XFS_RW_H__ */
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