[net-next-2.6.git] / fs / xfs / xfs_log.h

/*
 * 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_LOG_H__
#define __XFS_LOG_H__

/* get lsn fields */

#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
#define BLOCK_LSN(lsn) ((uint)(lsn))
/* this is used in a spot where we might otherwise double-endian-flip */
#define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])

#ifdef __KERNEL__
/*
 * By comparing each component, we don't have to worry about extra
 * endian issues in treating two 32 bit numbers as one 64 bit number
 */
static inline xfs_lsn_t	_lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
{
	if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
		return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;

	if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
		return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;

	return 0;
}

#define	XFS_LSN_CMP(x,y) _lsn_cmp(x,y)

/*
 * Macros, structures, prototypes for interface to the log manager.
 */

/*
 * Flags to xfs_log_done()
 */
#define XFS_LOG_REL_PERM_RESERV	0x1

/*
 * Flags to xfs_log_reserve()
 *
 *	XFS_LOG_SLEEP:	 If space is not available, sleep (default)
 *	XFS_LOG_NOSLEEP: If space is not available, return error
 *	XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
 *		performed against this type of reservation, the reservation
 *		is not decreased.  Long running transactions should use this.
 */
#define XFS_LOG_SLEEP		0x0
#define XFS_LOG_NOSLEEP		0x1
#define XFS_LOG_PERM_RESERV	0x2

/*
 * Flags to xfs_log_force()
 *
 *	XFS_LOG_SYNC:	Synchronous force in-core log to disk
 *	XFS_LOG_FORCE:	Start in-core log write now.
 *	XFS_LOG_URGE:	Start write within some window of time.
 *
 * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
 */
#define XFS_LOG_SYNC		0x1
#define XFS_LOG_FORCE		0x2
#define XFS_LOG_URGE		0x4

#endif	/* __KERNEL__ */


/* Log Clients */
#define XFS_TRANSACTION		0x69
#define XFS_VOLUME		0x2
#define XFS_LOG			0xaa


/* Region types for iovec's i_type */
#define XLOG_REG_TYPE_BFORMAT		1
#define XLOG_REG_TYPE_BCHUNK		2
#define XLOG_REG_TYPE_EFI_FORMAT	3
#define XLOG_REG_TYPE_EFD_FORMAT	4
#define XLOG_REG_TYPE_IFORMAT		5
#define XLOG_REG_TYPE_ICORE		6
#define XLOG_REG_TYPE_IEXT		7
#define XLOG_REG_TYPE_IBROOT		8
#define XLOG_REG_TYPE_ILOCAL		9
#define XLOG_REG_TYPE_IATTR_EXT		10
#define XLOG_REG_TYPE_IATTR_BROOT	11
#define XLOG_REG_TYPE_IATTR_LOCAL	12
#define XLOG_REG_TYPE_QFORMAT		13
#define XLOG_REG_TYPE_DQUOT		14
#define XLOG_REG_TYPE_QUOTAOFF		15
#define XLOG_REG_TYPE_LRHEADER		16
#define XLOG_REG_TYPE_UNMOUNT		17
#define XLOG_REG_TYPE_COMMIT		18
#define XLOG_REG_TYPE_TRANSHDR		19
#define XLOG_REG_TYPE_MAX		19

#define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))

typedef struct xfs_log_iovec {
	xfs_caddr_t		i_addr;		/* beginning address of region */
	int		i_len;		/* length in bytes of region */
	uint		i_type;		/* type of region */
} xfs_log_iovec_t;

typedef void* xfs_log_ticket_t;

/*
 * Structure used to pass callback function and the function's argument
 * to the log manager.
 */
typedef struct xfs_log_callback {
	struct xfs_log_callback	*cb_next;
	void			(*cb_func)(void *, int);
	void			*cb_arg;
} xfs_log_callback_t;


#ifdef __KERNEL__
/* Log manager interfaces */
struct xfs_mount;
xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
		       xfs_log_ticket_t ticket,
		       void		**iclog,
		       uint		flags);
int	  _xfs_log_force(struct xfs_mount *mp,
			 xfs_lsn_t	lsn,
			 uint		flags,
			 int		*log_forced);
#define xfs_log_force(mp, lsn, flags) \
	_xfs_log_force(mp, lsn, flags, NULL);
int	  xfs_log_mount(struct xfs_mount	*mp,
			struct xfs_buftarg	*log_target,
			xfs_daddr_t		start_block,
			int		 	num_bblocks);
int	  xfs_log_mount_finish(struct xfs_mount *mp, int);
void	  xfs_log_move_tail(struct xfs_mount	*mp,
			    xfs_lsn_t		tail_lsn);
int	  xfs_log_notify(struct xfs_mount	*mp,
			 void			*iclog,
			 xfs_log_callback_t	*callback_entry);
int	  xfs_log_release_iclog(struct xfs_mount *mp,
			 void			 *iclog_hndl);
int	  xfs_log_reserve(struct xfs_mount *mp,
			  int		   length,
			  int		   count,
			  xfs_log_ticket_t *ticket,
			  __uint8_t	   clientid,
			  uint		   flags,
			  uint		   t_type);
int	  xfs_log_write(struct xfs_mount *mp,
			xfs_log_iovec_t  region[],
			int		 nentries,
			xfs_log_ticket_t ticket,
			xfs_lsn_t	 *start_lsn);
int	  xfs_log_unmount(struct xfs_mount *mp);
int	  xfs_log_unmount_write(struct xfs_mount *mp);
void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
int	  xfs_log_force_umount(struct xfs_mount *mp, int logerror);
int	  xfs_log_need_covered(struct xfs_mount *mp);

void	  xlog_iodone(struct xfs_buf *);

#endif


extern int xlog_debug;		/* set to 1 to enable real log */


#endif	/* __XFS_LOG_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
7b718769 NS	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_LOG_H__
	19	#define __XFS_LOG_H__
	20
	21	/* get lsn fields */
	22
	23	#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
	24	#define BLOCK_LSN(lsn) ((uint)(lsn))
	25	/* this is used in a spot where we might otherwise double-endian-flip */
	26	#define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
	27
	28	#ifdef __KERNEL__
	29	/*
c41564b5	30	* By comparing each component, we don't have to worry about extra
1da177e4 LT	31	* endian issues in treating two 32 bit numbers as one 64 bit number
1da177e4 LT	32	*/
a1365647	33	static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
1da177e4 LT	34	{
	35	if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
	36	return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
	37
	38	if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
	39	return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
	40
	41	return 0;
	42	}
	43
	44	#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
	45
	46	/*
	47	* Macros, structures, prototypes for interface to the log manager.
	48	*/
	49
1da177e4 LT	50	/*
	51	* Flags to xfs_log_done()
	52	*/
	53	#define XFS_LOG_REL_PERM_RESERV 0x1
	54
1da177e4 LT	55	/*
	56	* Flags to xfs_log_reserve()
	57	*
	58	* XFS_LOG_SLEEP: If space is not available, sleep (default)
	59	* XFS_LOG_NOSLEEP: If space is not available, return error
	60	* XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
	61	* performed against this type of reservation, the reservation
	62	* is not decreased. Long running transactions should use this.
	63	*/
	64	#define XFS_LOG_SLEEP 0x0
	65	#define XFS_LOG_NOSLEEP 0x1
	66	#define XFS_LOG_PERM_RESERV 0x2
1da177e4 LT	67
	68	/*
	69	* Flags to xfs_log_force()
	70	*
	71	* XFS_LOG_SYNC: Synchronous force in-core log to disk
	72	* XFS_LOG_FORCE: Start in-core log write now.
	73	* XFS_LOG_URGE: Start write within some window of time.
	74	*
	75	* Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
	76	*/
	77	#define XFS_LOG_SYNC 0x1
	78	#define XFS_LOG_FORCE 0x2
	79	#define XFS_LOG_URGE 0x4
	80
	81	#endif /* __KERNEL__ */
	82
	83
	84	/* Log Clients */
	85	#define XFS_TRANSACTION 0x69
	86	#define XFS_VOLUME 0x2
	87	#define XFS_LOG 0xaa
	88
7e9c6396 TS	89
7e9c6396 TS	90	/* Region types for iovec's i_type */
7e9c6396 TS	91	#define XLOG_REG_TYPE_BFORMAT 1
	92	#define XLOG_REG_TYPE_BCHUNK 2
	93	#define XLOG_REG_TYPE_EFI_FORMAT 3
	94	#define XLOG_REG_TYPE_EFD_FORMAT 4
	95	#define XLOG_REG_TYPE_IFORMAT 5
	96	#define XLOG_REG_TYPE_ICORE 6
	97	#define XLOG_REG_TYPE_IEXT 7
	98	#define XLOG_REG_TYPE_IBROOT 8
	99	#define XLOG_REG_TYPE_ILOCAL 9
	100	#define XLOG_REG_TYPE_IATTR_EXT 10
	101	#define XLOG_REG_TYPE_IATTR_BROOT 11
	102	#define XLOG_REG_TYPE_IATTR_LOCAL 12
	103	#define XLOG_REG_TYPE_QFORMAT 13
	104	#define XLOG_REG_TYPE_DQUOT 14
	105	#define XLOG_REG_TYPE_QUOTAOFF 15
	106	#define XLOG_REG_TYPE_LRHEADER 16
	107	#define XLOG_REG_TYPE_UNMOUNT 17
	108	#define XLOG_REG_TYPE_COMMIT 18
	109	#define XLOG_REG_TYPE_TRANSHDR 19
	110	#define XLOG_REG_TYPE_MAX 19
7e9c6396	111
7e9c6396	112	#define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
7e9c6396	113
1da177e4 LT	114	typedef struct xfs_log_iovec {
	115	xfs_caddr_t i_addr; /* beginning address of region */
	116	int i_len; /* length in bytes of region */
1259845d	117	uint i_type; /* type of region */
1da177e4 LT	118	} xfs_log_iovec_t;
	119
	120	typedef void* xfs_log_ticket_t;
	121
	122	/*
	123	* Structure used to pass callback function and the function's argument
	124	* to the log manager.
	125	*/
	126	typedef struct xfs_log_callback {
	127	struct xfs_log_callback *cb_next;
	128	void (cb_func)(void , int);
	129	void *cb_arg;
	130	} xfs_log_callback_t;
	131
	132
	133	#ifdef __KERNEL__
	134	/* Log manager interfaces */
	135	struct xfs_mount;
	136	xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
	137	xfs_log_ticket_t ticket,
	138	void **iclog,
	139	uint flags);
f538d4da CH	140	int _xfs_log_force(struct xfs_mount *mp,
	141	xfs_lsn_t lsn,
	142	uint flags,
	143	int *log_forced);
	144	#define xfs_log_force(mp, lsn, flags) \
	145	_xfs_log_force(mp, lsn, flags, NULL);
1da177e4 LT	146	int xfs_log_mount(struct xfs_mount *mp,
	147	struct xfs_buftarg *log_target,
	148	xfs_daddr_t start_block,
	149	int num_bblocks);
	150	int xfs_log_mount_finish(struct xfs_mount *mp, int);
	151	void xfs_log_move_tail(struct xfs_mount *mp,
	152	xfs_lsn_t tail_lsn);
	153	int xfs_log_notify(struct xfs_mount *mp,
	154	void *iclog,
	155	xfs_log_callback_t *callback_entry);
	156	int xfs_log_release_iclog(struct xfs_mount *mp,
	157	void *iclog_hndl);
	158	int xfs_log_reserve(struct xfs_mount *mp,
	159	int length,
	160	int count,
	161	xfs_log_ticket_t *ticket,
	162	__uint8_t clientid,
7e9c6396 TS	163	uint flags,
7e9c6396 TS	164	uint t_type);
1da177e4 LT	165	int xfs_log_write(struct xfs_mount *mp,
	166	xfs_log_iovec_t region[],
	167	int nentries,
	168	xfs_log_ticket_t ticket,
	169	xfs_lsn_t *start_lsn);
	170	int xfs_log_unmount(struct xfs_mount *mp);
	171	int xfs_log_unmount_write(struct xfs_mount *mp);
	172	void xfs_log_unmount_dealloc(struct xfs_mount *mp);
	173	int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
	174	int xfs_log_need_covered(struct xfs_mount *mp);
	175
	176	void xlog_iodone(struct xfs_buf *);
	177
	178	#endif
	179
	180
	181	extern int xlog_debug; /* set to 1 to enable real log */
	182
	183
	184	#endif /* __XFS_LOG_H__ */