[linux-2.6-block.git] / fs / xfs / xfs_rw.h

/*
 * Copyright (c) 2000-2006 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)));
}

/*
 * Flags for xfs_free_eofblocks
 */
#define XFS_FREE_EOF_LOCK	(1<<0)
#define XFS_FREE_EOF_NOLOCK	(1<<1)


/*
 * helper function to extract extent size hint from inode
 */
STATIC_INLINE xfs_extlen_t
xfs_get_extsz_hint(
	xfs_inode_t	*ip)
{
	xfs_extlen_t	extsz;

	if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
		extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
				? ip->i_d.di_extsize
				: ip->i_mount->m_sb.sb_rextsize;
		ASSERT(extsz);
	} else {
		extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
				? ip->i_d.di_extsize : 0;
	}
	return extsz;
}

/*
 * Prototypes for functions in xfs_rw.c.
 */
extern int xfs_write_clear_setuid(struct xfs_inode *ip);
extern int xfs_write_sync_logforce(struct xfs_mount *mp, 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, bhv_vrwlock_t write_lock);
extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
extern int xfs_setattr(bhv_desc_t *, bhv_vattr_t *vap, int flags,
			cred_t *credp);
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);
extern int xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
			int flags);

#endif /* __XFS_RW_H__ */
Commit	Line	Data
1da177e4	1	/*
1e69dd0e	2	* Copyright (c) 2000-2006 Silicon Graphics, Inc.
7b718769	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_RW_H__
	19	#define __XFS_RW_H__
	20
	21	struct xfs_buf;
	22	struct xfs_inode;
	23	struct xfs_mount;
	24
	25	/*
	26	* Maximum count of bmaps used by read and write paths.
	27	*/
	28	#define XFS_MAX_RW_NBMAPS 4
	29
	30	/*
	31	* Counts of readahead buffers to use based on physical memory size.
	32	* None of these should be more than XFS_MAX_RW_NBMAPS.
	33	*/
	34	#define XFS_RW_NREADAHEAD_16MB 2
	35	#define XFS_RW_NREADAHEAD_32MB 3
	36	#define XFS_RW_NREADAHEAD_K32 4
	37	#define XFS_RW_NREADAHEAD_K64 4
	38
	39	/*
	40	* Maximum size of a buffer that we\'ll map. Making this
	41	* too big will degrade performance due to the number of
	42	* pages which need to be gathered. Making it too small
	43	* will prevent us from doing large I/O\'s to hardware that
	44	* needs it.
	45	*
	46	* This is currently set to 512 KB.
	47	*/
	48	#define XFS_MAX_BMAP_LEN_BB 1024
	49	#define XFS_MAX_BMAP_LEN_BYTES 524288
	50
	51	/*
	52	* Convert the given file system block to a disk block.
	53	* We have to treat it differently based on whether the
	54	* file is a real time file or not, because the bmap code
	55	* does.
	56	*/
1da177e4	57	#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
a844f451 NS	58	static inline xfs_daddr_t
	59	xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
	60	{
	61	return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
1da177e4	62	(xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
a844f451 NS	63	XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
	64	}
	65	#define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
	66	static inline xfs_daddr_t
	67	xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
	68	{
	69	return (((io)->io_flags & XFS_IOCORE_RT) ? \
1da177e4	70	XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
a844f451 NS	71	XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
a844f451 NS	72	}
1da177e4	73
92dfe8d2 DC	74	/*
	75	* Flags for xfs_free_eofblocks
	76	*/
	77	#define XFS_FREE_EOF_LOCK (1<<0)
	78	#define XFS_FREE_EOF_NOLOCK (1<<1)
	79
957d0ebe DC	80
	81	/*
	82	* helper function to extract extent size hint from inode
	83	*/
	84	STATIC_INLINE xfs_extlen_t
	85	xfs_get_extsz_hint(
	86	xfs_inode_t *ip)
	87	{
	88	xfs_extlen_t extsz;
	89
	90	if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
	91	extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
	92	? ip->i_d.di_extsize
	93	: ip->i_mount->m_sb.sb_rextsize;
	94	ASSERT(extsz);
	95	} else {
	96	extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
	97	? ip->i_d.di_extsize : 0;
	98	}
	99	return extsz;
	100	}
	101
1da177e4 LT	102	/*
	103	* Prototypes for functions in xfs_rw.c.
	104	*/
a844f451	105	extern int xfs_write_clear_setuid(struct xfs_inode *ip);
1e69dd0e	106	extern int xfs_write_sync_logforce(struct xfs_mount mp, struct xfs_inode ip);
a844f451 NS	107	extern int xfs_bwrite(struct xfs_mount mp, struct xfs_buf bp);
	108	extern int xfs_bioerror(struct xfs_buf *bp);
	109	extern int xfs_bioerror_relse(struct xfs_buf *bp);
	110	extern int xfs_read_buf(struct xfs_mount mp, xfs_buftarg_t btp,
	111	xfs_daddr_t blkno, int len, uint flags,
	112	struct xfs_buf **bpp);
	113	extern void xfs_ioerror_alert(char func, struct xfs_mount mp,
	114	xfs_buf_t *bp, xfs_daddr_t blkno);
1da177e4 LT	115
	116	/*
	117	* Prototypes for functions in xfs_vnodeops.c.
	118	*/
8285fb58 NS	119	extern int xfs_rwlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
	120	extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
	121	extern int xfs_setattr(bhv_desc_t , bhv_vattr_t vap, int flags,
92dfe8d2	122	cred_t *credp);
a844f451	123	extern int xfs_change_file_space(bhv_desc_t bdp, int cmd, xfs_flock64_t bf,
92dfe8d2	124	xfs_off_t offset, cred_t *credp, int flags);
a844f451	125	extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
92dfe8d2 DC	126	cred_t *credp);
	127	extern int xfs_free_eofblocks(struct xfs_mount mp, struct xfs_inode ip,
	128	int flags);
1da177e4 LT	129
1da177e4 LT	130	#endif /* __XFS_RW_H__ */