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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_RW_H__
#define __XFS_RW_H__
struct bhv_desc;
struct bmapval;
struct xfs_buf;
struct cred;
struct flid;
struct uio;
struct vnode;
struct xfs_inode;
struct xfs_iocore;
struct xfs_mount;
struct xfs_trans;
struct xfs_dio;
struct pm;
/*
* Maximum count of bmaps used by read and write paths.
*/
#define XFS_MAX_RW_NBMAPS 4
/*
* Counts of readahead buffers to use based on physical memory size.
* None of these should be more than XFS_MAX_RW_NBMAPS.
*/
#define XFS_RW_NREADAHEAD_16MB 2
#define XFS_RW_NREADAHEAD_32MB 3
#define XFS_RW_NREADAHEAD_K32 4
#define XFS_RW_NREADAHEAD_K64 4
/*
* Maximum size of a buffer that we\'ll map. Making this
* too big will degrade performance due to the number of
* pages which need to be gathered. Making it too small
* will prevent us from doing large I/O\'s to hardware that
* needs it.
*
* This is currently set to 512 KB.
*/
#define XFS_MAX_BMAP_LEN_BB 1024
#define XFS_MAX_BMAP_LEN_BYTES 524288
/*
* Maximum size (in inodes) for the nfs refcache
*/
#define XFS_REFCACHE_SIZE_MAX 512
/*
* Convert the given file system block to a disk block.
* We have to treat it differently based on whether the
* file is a real time file or not, because the bmap code
* does.
*/
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_DB)
xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
#else
#define XFS_FSB_TO_DB(ip,fsb) \
(((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
(xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)))
#endif
#define XFS_FSB_TO_DB_IO(io,fsb) \
(((io)->io_flags & XFS_IOCORE_RT) ? \
XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
/*
* Defines for the trace mechanisms in xfs_rw.c.
*/
#define XFS_RW_KTRACE_SIZE 64
#define XFS_STRAT_KTRACE_SIZE 64
#define XFS_STRAT_GTRACE_SIZE 512
#define XFS_READ_ENTER 1
#define XFS_WRITE_ENTER 2
#define XFS_IOMAP_READ_ENTER 3
#define XFS_IOMAP_WRITE_ENTER 4
#define XFS_IOMAP_READ_MAP 5
#define XFS_IOMAP_WRITE_MAP 6
#define XFS_IOMAP_WRITE_NOSPACE 7
#define XFS_ITRUNC_START 8
#define XFS_ITRUNC_FINISH1 9
#define XFS_ITRUNC_FINISH2 10
#define XFS_CTRUNC1 11
#define XFS_CTRUNC2 12
#define XFS_CTRUNC3 13
#define XFS_CTRUNC4 14
#define XFS_CTRUNC5 15
#define XFS_CTRUNC6 16
#define XFS_BUNMAPI 17
#define XFS_INVAL_CACHED 18
#define XFS_DIORD_ENTER 19
#define XFS_DIOWR_ENTER 20
#if defined(XFS_ALL_TRACE)
#define XFS_RW_TRACE
#define XFS_STRAT_TRACE
#endif
#if !defined(DEBUG)
#undef XFS_RW_TRACE
#undef XFS_STRAT_TRACE
#endif
/*
* Prototypes for functions in xfs_rw.c.
*/
int
xfs_write_clear_setuid(
struct xfs_inode *ip);
int
xfs_bwrite(
struct xfs_mount *mp,
struct xfs_buf *bp);
void
xfs_inval_cached_pages(
struct vnode *vp,
struct xfs_iocore *io,
xfs_off_t offset,
xfs_off_t len,
void *dio);
void
xfs_refcache_insert(
struct xfs_inode *ip);
void
xfs_refcache_purge_ip(
struct xfs_inode *ip);
void
xfs_refcache_purge_mp(
struct xfs_mount *mp);
void
xfs_refcache_purge_some(
struct xfs_mount *mp);
void
xfs_refcache_resize(
int xfs_refcache_new_size);
int
xfs_bioerror(
struct xfs_buf *b);
/*
* XFS I/O core functions
*/
extern int xfs_bioerror_relse(struct xfs_buf *);
/*
* Needed by xfs_rw.c
*/
int
xfs_rwlock(
bhv_desc_t *bdp,
vrwlock_t write_lock);
void
xfs_rwunlock(
bhv_desc_t *bdp,
vrwlock_t write_lock);
int
xfs_read_buf(
struct xfs_mount *mp,
buftarg_t *target,
xfs_daddr_t blkno,
int len,
uint flags,
struct xfs_buf **bpp);
void
xfs_ioerror_alert(
char *func,
struct xfs_mount *mp,
xfs_buf_t *bp,
xfs_daddr_t blkno);
#endif /* __XFS_RW_H__ */
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