mirror of
https://github.com/torvalds/linux
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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
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static inline xfs_daddr_t
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xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
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{
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return (((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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}
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#define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
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static inline xfs_daddr_t
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xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
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{
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return (((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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/*
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* Prototypes for functions in xfs_rw.c.
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*/
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extern int xfs_write_clear_setuid(struct xfs_inode *ip);
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extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
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extern int xfs_bioerror(struct xfs_buf *bp);
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extern int xfs_bioerror_relse(struct xfs_buf *bp);
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extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
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xfs_daddr_t blkno, int len, uint flags,
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struct xfs_buf **bpp);
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extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
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xfs_buf_t *bp, 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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extern int xfs_rwlock(bhv_desc_t *bdp, vrwlock_t write_lock);
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extern void xfs_rwunlock(bhv_desc_t *bdp, vrwlock_t write_lock);
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extern int xfs_setattr(bhv_desc_t *bdp, vattr_t *vap, int flags, cred_t *credp);
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extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
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xfs_off_t offset, cred_t *credp, int flags);
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extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
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cred_t *credp);
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#endif /* __XFS_RW_H__ */
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