1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
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.
13  *
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
17  */
18 #ifndef	__XFS_LOG_H__
19 #define __XFS_LOG_H__
20 
21 /* get lsn fields */
22 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
23 #define BLOCK_LSN(lsn) ((uint)(lsn))
24 
25 /* this is used in a spot where we might otherwise double-endian-flip */
26 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
27 
28 #ifdef __KERNEL__
29 /*
30  * By comparing each component, we don't have to worry about extra
31  * endian issues in treating two 32 bit numbers as one 64 bit number
32  */
_lsn_cmp(xfs_lsn_t lsn1,xfs_lsn_t lsn2)33 static inline xfs_lsn_t	_lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
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 
50 /*
51  * Flags to xfs_log_done()
52  */
53 #define XFS_LOG_REL_PERM_RESERV	0x1
54 
55 /*
56  * Flags to xfs_log_force()
57  *
58  *	XFS_LOG_SYNC:	Synchronous force in-core log to disk
59  */
60 #define XFS_LOG_SYNC		0x1
61 
62 #endif	/* __KERNEL__ */
63 
64 
65 /* Log Clients */
66 #define XFS_TRANSACTION		0x69
67 #define XFS_VOLUME		0x2
68 #define XFS_LOG			0xaa
69 
70 
71 /* Region types for iovec's i_type */
72 #define XLOG_REG_TYPE_BFORMAT		1
73 #define XLOG_REG_TYPE_BCHUNK		2
74 #define XLOG_REG_TYPE_EFI_FORMAT	3
75 #define XLOG_REG_TYPE_EFD_FORMAT	4
76 #define XLOG_REG_TYPE_IFORMAT		5
77 #define XLOG_REG_TYPE_ICORE		6
78 #define XLOG_REG_TYPE_IEXT		7
79 #define XLOG_REG_TYPE_IBROOT		8
80 #define XLOG_REG_TYPE_ILOCAL		9
81 #define XLOG_REG_TYPE_IATTR_EXT		10
82 #define XLOG_REG_TYPE_IATTR_BROOT	11
83 #define XLOG_REG_TYPE_IATTR_LOCAL	12
84 #define XLOG_REG_TYPE_QFORMAT		13
85 #define XLOG_REG_TYPE_DQUOT		14
86 #define XLOG_REG_TYPE_QUOTAOFF		15
87 #define XLOG_REG_TYPE_LRHEADER		16
88 #define XLOG_REG_TYPE_UNMOUNT		17
89 #define XLOG_REG_TYPE_COMMIT		18
90 #define XLOG_REG_TYPE_TRANSHDR		19
91 #define XLOG_REG_TYPE_MAX		19
92 
93 typedef struct xfs_log_iovec {
94 	void		*i_addr;	/* beginning address of region */
95 	int		i_len;		/* length in bytes of region */
96 	uint		i_type;		/* type of region */
97 } xfs_log_iovec_t;
98 
99 struct xfs_log_vec {
100 	struct xfs_log_vec	*lv_next;	/* next lv in build list */
101 	int			lv_niovecs;	/* number of iovecs in lv */
102 	struct xfs_log_iovec	*lv_iovecp;	/* iovec array */
103 	struct xfs_log_item	*lv_item;	/* owner */
104 	char			*lv_buf;	/* formatted buffer */
105 	int			lv_buf_len;	/* size of formatted buffer */
106 };
107 
108 /*
109  * Structure used to pass callback function and the function's argument
110  * to the log manager.
111  */
112 typedef struct xfs_log_callback {
113 	struct xfs_log_callback	*cb_next;
114 	void			(*cb_func)(void *, int);
115 	void			*cb_arg;
116 } xfs_log_callback_t;
117 
118 
119 #ifdef __KERNEL__
120 /* Log manager interfaces */
121 struct xfs_mount;
122 struct xlog_in_core;
123 struct xlog_ticket;
124 struct xfs_log_item;
125 struct xfs_item_ops;
126 struct xfs_trans;
127 
128 void	xfs_log_item_init(struct xfs_mount	*mp,
129 			struct xfs_log_item	*item,
130 			int			type,
131 			const struct xfs_item_ops *ops);
132 
133 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
134 		       struct xlog_ticket *ticket,
135 		       struct xlog_in_core **iclog,
136 		       uint		flags);
137 int	  _xfs_log_force(struct xfs_mount *mp,
138 			 uint		flags,
139 			 int		*log_forced);
140 void	  xfs_log_force(struct xfs_mount	*mp,
141 			uint			flags);
142 int	  _xfs_log_force_lsn(struct xfs_mount *mp,
143 			     xfs_lsn_t		lsn,
144 			     uint		flags,
145 			     int		*log_forced);
146 void	  xfs_log_force_lsn(struct xfs_mount	*mp,
147 			    xfs_lsn_t		lsn,
148 			    uint		flags);
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);
153 int	  xfs_log_mount_finish(struct xfs_mount *mp);
154 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
155 void	  xfs_log_space_wake(struct xfs_mount *mp);
156 int	  xfs_log_notify(struct xfs_mount	*mp,
157 			 struct xlog_in_core	*iclog,
158 			 xfs_log_callback_t	*callback_entry);
159 int	  xfs_log_release_iclog(struct xfs_mount *mp,
160 			 struct xlog_in_core	 *iclog);
161 int	  xfs_log_reserve(struct xfs_mount *mp,
162 			  int		   length,
163 			  int		   count,
164 			  struct xlog_ticket **ticket,
165 			  __uint8_t	   clientid,
166 			  bool		   permanent,
167 			  uint		   t_type);
168 int	  xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
169 int	  xfs_log_unmount_write(struct xfs_mount *mp);
170 void      xfs_log_unmount(struct xfs_mount *mp);
171 int	  xfs_log_force_umount(struct xfs_mount *mp, int logerror);
172 int	  xfs_log_need_covered(struct xfs_mount *mp);
173 
174 void	  xlog_iodone(struct xfs_buf *);
175 
176 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
177 void	  xfs_log_ticket_put(struct xlog_ticket *ticket);
178 
179 int	xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
180 				xfs_lsn_t *commit_lsn, int flags);
181 bool	xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
182 
183 #endif
184 #endif	/* __XFS_LOG_H__ */
185