/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_RW_H__
#define __XFS_RW_H__
struct xfs_buf;
struct xfs_inode;
struct xfs_mount;
/*
* 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
/*
* 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.
*/
#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
static inline xfs_daddr_t
xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
{
return (((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)));
}
#define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
static inline xfs_daddr_t
xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
{
return (((io)->io_flags & XFS_IOCORE_RT) ? \
XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
}
/*
* Prototypes for functions in xfs_rw.c.
*/
extern int xfs_write_clear_setuid(struct xfs_inode *ip);
extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
extern int xfs_bioerror(struct xfs_buf *bp);
extern int xfs_bioerror_relse(struct xfs_buf *bp);
extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
xfs_daddr_t blkno, int len, uint flags,
struct xfs_buf **bpp);
extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
xfs_buf_t *bp, xfs_daddr_t blkno);
/*
* Prototypes for functions in xfs_vnodeops.c.
*/
extern int xfs_rwlock(bhv_desc_t *bdp, vrwlock_t write_lock);
extern void xfs_rwunlock(bhv_desc_t *bdp, vrwlock_t write_lock);
extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
xfs_off_t offset, cred_t *credp, int flags);
extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
cred_t *credp);
#endif /* __XFS_RW_H__ */
