[linux-2.6-block.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) (((__be32 *)&(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;
struct xlog_ticket;
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);
void	  xfs_log_force(struct xfs_mount	*mp,
			xfs_lsn_t		lsn,
			uint			flags);
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);
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_write(struct xfs_mount *mp);
void      xfs_log_unmount(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 *);

struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
void	  xfs_log_ticket_put(struct xlog_ticket *ticket);

#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))
b53e675d	25
1da177e4	26	/* this is used in a spot where we might otherwise double-endian-flip */
b53e675d	27	#define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
1da177e4 LT	28
	29	#ifdef __KERNEL__
	30	/*
c41564b5	31	* By comparing each component, we don't have to worry about extra
1da177e4 LT	32	* endian issues in treating two 32 bit numbers as one 64 bit number
1da177e4 LT	33	*/
a1365647	34	static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
1da177e4 LT	35	{
	36	if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
	37	return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
	38
	39	if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
	40	return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
	41
	42	return 0;
	43	}
	44
	45	#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
	46
	47	/*
	48	* Macros, structures, prototypes for interface to the log manager.
	49	*/
	50
1da177e4 LT	51	/*
	52	* Flags to xfs_log_done()
	53	*/
	54	#define XFS_LOG_REL_PERM_RESERV 0x1
	55
1da177e4 LT	56	/*
	57	* Flags to xfs_log_reserve()
	58	*
	59	* XFS_LOG_SLEEP: If space is not available, sleep (default)
	60	* XFS_LOG_NOSLEEP: If space is not available, return error
	61	* XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
	62	* performed against this type of reservation, the reservation
	63	* is not decreased. Long running transactions should use this.
	64	*/
	65	#define XFS_LOG_SLEEP 0x0
	66	#define XFS_LOG_NOSLEEP 0x1
	67	#define XFS_LOG_PERM_RESERV 0x2
1da177e4 LT	68
	69	/*
	70	* Flags to xfs_log_force()
	71	*
	72	* XFS_LOG_SYNC: Synchronous force in-core log to disk
	73	* XFS_LOG_FORCE: Start in-core log write now.
	74	* XFS_LOG_URGE: Start write within some window of time.
	75	*
	76	* Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
	77	*/
	78	#define XFS_LOG_SYNC 0x1
	79	#define XFS_LOG_FORCE 0x2
	80	#define XFS_LOG_URGE 0x4
	81
	82	#endif /* __KERNEL__ */
	83
	84
	85	/* Log Clients */
	86	#define XFS_TRANSACTION 0x69
	87	#define XFS_VOLUME 0x2
	88	#define XFS_LOG 0xaa
	89
7e9c6396 TS	90
7e9c6396 TS	91	/* Region types for iovec's i_type */
7e9c6396 TS	92	#define XLOG_REG_TYPE_BFORMAT 1
	93	#define XLOG_REG_TYPE_BCHUNK 2
	94	#define XLOG_REG_TYPE_EFI_FORMAT 3
	95	#define XLOG_REG_TYPE_EFD_FORMAT 4
	96	#define XLOG_REG_TYPE_IFORMAT 5
	97	#define XLOG_REG_TYPE_ICORE 6
	98	#define XLOG_REG_TYPE_IEXT 7
	99	#define XLOG_REG_TYPE_IBROOT 8
	100	#define XLOG_REG_TYPE_ILOCAL 9
	101	#define XLOG_REG_TYPE_IATTR_EXT 10
	102	#define XLOG_REG_TYPE_IATTR_BROOT 11
	103	#define XLOG_REG_TYPE_IATTR_LOCAL 12
	104	#define XLOG_REG_TYPE_QFORMAT 13
	105	#define XLOG_REG_TYPE_DQUOT 14
	106	#define XLOG_REG_TYPE_QUOTAOFF 15
	107	#define XLOG_REG_TYPE_LRHEADER 16
	108	#define XLOG_REG_TYPE_UNMOUNT 17
	109	#define XLOG_REG_TYPE_COMMIT 18
	110	#define XLOG_REG_TYPE_TRANSHDR 19
	111	#define XLOG_REG_TYPE_MAX 19
7e9c6396	112
7e9c6396	113	#define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
7e9c6396	114
1da177e4 LT	115	typedef struct xfs_log_iovec {
	116	xfs_caddr_t i_addr; /* beginning address of region */
	117	int i_len; /* length in bytes of region */
1259845d	118	uint i_type; /* type of region */
1da177e4 LT	119	} xfs_log_iovec_t;
	120
	121	typedef void* xfs_log_ticket_t;
	122
	123	/*
	124	* Structure used to pass callback function and the function's argument
	125	* to the log manager.
	126	*/
	127	typedef struct xfs_log_callback {
	128	struct xfs_log_callback *cb_next;
	129	void (cb_func)(void , int);
	130	void *cb_arg;
	131	} xfs_log_callback_t;
	132
	133
	134	#ifdef __KERNEL__
	135	/* Log manager interfaces */
	136	struct xfs_mount;
cc09c0dc	137	struct xlog_ticket;
1da177e4 LT	138	xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
	139	xfs_log_ticket_t ticket,
	140	void **iclog,
	141	uint flags);
f538d4da CH	142	int _xfs_log_force(struct xfs_mount *mp,
	143	xfs_lsn_t lsn,
	144	uint flags,
	145	int *log_forced);
b911ca04 DC	146	void xfs_log_force(struct xfs_mount *mp,
	147	xfs_lsn_t lsn,
	148	uint flags);
1da177e4 LT	149	int xfs_log_mount(struct xfs_mount *mp,
	150	struct xfs_buftarg *log_target,
	151	xfs_daddr_t start_block,
	152	int num_bblocks);
4249023a	153	int xfs_log_mount_finish(struct xfs_mount *mp);
1da177e4 LT	154	void xfs_log_move_tail(struct xfs_mount *mp,
	155	xfs_lsn_t tail_lsn);
	156	int xfs_log_notify(struct xfs_mount *mp,
	157	void *iclog,
	158	xfs_log_callback_t *callback_entry);
	159	int xfs_log_release_iclog(struct xfs_mount *mp,
	160	void *iclog_hndl);
	161	int xfs_log_reserve(struct xfs_mount *mp,
	162	int length,
	163	int count,
	164	xfs_log_ticket_t *ticket,
	165	__uint8_t clientid,
7e9c6396 TS	166	uint flags,
7e9c6396 TS	167	uint t_type);
1da177e4 LT	168	int xfs_log_write(struct xfs_mount *mp,
	169	xfs_log_iovec_t region[],
	170	int nentries,
	171	xfs_log_ticket_t ticket,
	172	xfs_lsn_t *start_lsn);
1da177e4	173	int xfs_log_unmount_write(struct xfs_mount *mp);
21b699c8	174	void xfs_log_unmount(struct xfs_mount *mp);
1da177e4 LT	175	int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
	176	int xfs_log_need_covered(struct xfs_mount *mp);
	177
	178	void xlog_iodone(struct xfs_buf *);
	179
cc09c0dc DC	180	struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
	181	void xfs_log_ticket_put(struct xlog_ticket *ticket);
	182
1da177e4 LT	183	#endif
	184
	185
	186	extern int xlog_debug; /* set to 1 to enable real log */
	187
	188
	189	#endif /* __XFS_LOG_H__ */