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
23 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
24 #define BLOCK_LSN(lsn) ((uint)(lsn))
25
26 /* this is used in a spot where we might otherwise double-endian-flip */
27 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
28
29 #ifdef __KERNEL__
30 /*
31 * By comparing each component, we don't have to worry about extra
32 * endian issues in treating two 32 bit numbers as one 64 bit number
33 */
34 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
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
51 /*
52 * Flags to xfs_log_done()
53 */
54 #define XFS_LOG_REL_PERM_RESERV 0x1
55
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
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
90
91 /* Region types for iovec's i_type */
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
112
113 #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
114
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 */
118 uint i_type; /* type of region */
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;
137 struct xlog_ticket;
138 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
139 xfs_log_ticket_t ticket,
140 void **iclog,
141 uint flags);
142 int _xfs_log_force(struct xfs_mount *mp,
143 xfs_lsn_t lsn,
144 uint flags,
145 int *log_forced);
146 void xfs_log_force(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 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,
166 uint flags,
167 uint t_type);
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);
173 int xfs_log_unmount_write(struct xfs_mount *mp);
174 void xfs_log_unmount(struct xfs_mount *mp);
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
180 struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
181 void xfs_log_ticket_put(struct xlog_ticket *ticket);
182
183 #endif
184
185
186 extern int xlog_debug; /* set to 1 to enable real log */
187
188
189 #endif /* __XFS_LOG_H__ */
190
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