aboutsummaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_log.h
blob: 97a24c7795a4cf11ef6c68e7e8f3ef212af62e98 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/*
 * 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
 */
#define XFS_LOG_SYNC		0x1

#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

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;

/*
 * 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_in_core;
struct xlog_ticket;

xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
		       struct xlog_ticket *ticket,
		       struct xlog_in_core **iclog,
		       uint		flags);
int	  _xfs_log_force(struct xfs_mount *mp,
			 uint		flags,
			 int		*log_forced);
void	  xfs_log_force(struct xfs_mount	*mp,
			uint			flags);
int	  _xfs_log_force_lsn(struct xfs_mount *mp,
			     xfs_lsn_t		lsn,
			     uint		flags,
			     int		*log_forced);
void	  xfs_log_force_lsn(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,
			 struct xlog_in_core	*iclog,
			 xfs_log_callback_t	*callback_entry);
int	  xfs_log_release_iclog(struct xfs_mount *mp,
			 struct xlog_in_core	 *iclog);
int	  xfs_log_reserve(struct xfs_mount *mp,
			  int		   length,
			  int		   count,
			  struct xlog_ticket **ticket,
			  __uint8_t	   clientid,
			  uint		   flags,
			  uint		   t_type);
int	  xfs_log_write(struct xfs_mount *mp,
			xfs_log_iovec_t  region[],
			int		 nentries,
			struct xlog_ticket *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__ */