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1/*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_LOG_H__
33#define __XFS_LOG_H__
34
35/* get lsn fields */
36
37#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
38#define BLOCK_LSN(lsn) ((uint)(lsn))
39/* this is used in a spot where we might otherwise double-endian-flip */
40#define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
41
42#ifdef __KERNEL__
43/*
44 * By comparing each compnent, we don't have to worry about extra
45 * endian issues in treating two 32 bit numbers as one 64 bit number
46 */
47static
48#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
49__attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
50#else
51__inline__
52#endif
53xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
54{
55 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
56 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
57
58 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
59 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
60
61 return 0;
62}
63
64#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
65
66/*
67 * Macros, structures, prototypes for interface to the log manager.
68 */
69
70/*
71 * Flags to xfs_log_mount
72 */
73#define XFS_LOG_RECOVER 0x1
74
75/*
76 * Flags to xfs_log_done()
77 */
78#define XFS_LOG_REL_PERM_RESERV 0x1
79
80
81/*
82 * Flags to xfs_log_reserve()
83 *
84 * XFS_LOG_SLEEP: If space is not available, sleep (default)
85 * XFS_LOG_NOSLEEP: If space is not available, return error
86 * XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
87 * performed against this type of reservation, the reservation
88 * is not decreased. Long running transactions should use this.
89 */
90#define XFS_LOG_SLEEP 0x0
91#define XFS_LOG_NOSLEEP 0x1
92#define XFS_LOG_PERM_RESERV 0x2
93#define XFS_LOG_RESV_ALL (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
94
95
96/*
97 * Flags to xfs_log_force()
98 *
99 * XFS_LOG_SYNC: Synchronous force in-core log to disk
100 * XFS_LOG_FORCE: Start in-core log write now.
101 * XFS_LOG_URGE: Start write within some window of time.
102 *
103 * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
104 */
105#define XFS_LOG_SYNC 0x1
106#define XFS_LOG_FORCE 0x2
107#define XFS_LOG_URGE 0x4
108
109#endif /* __KERNEL__ */
110
111
112/* Log Clients */
113#define XFS_TRANSACTION 0x69
114#define XFS_VOLUME 0x2
115#define XFS_LOG 0xaa
116
117typedef struct xfs_log_iovec {
118 xfs_caddr_t i_addr; /* beginning address of region */
119 int i_len; /* length in bytes of region */
120} xfs_log_iovec_t;
121
122typedef void* xfs_log_ticket_t;
123
124/*
125 * Structure used to pass callback function and the function's argument
126 * to the log manager.
127 */
128typedef struct xfs_log_callback {
129 struct xfs_log_callback *cb_next;
130 void (*cb_func)(void *, int);
131 void *cb_arg;
132} xfs_log_callback_t;
133
134
135#ifdef __KERNEL__
136/* Log manager interfaces */
137struct xfs_mount;
138xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
139 xfs_log_ticket_t ticket,
140 void **iclog,
141 uint flags);
142int xfs_log_force(struct xfs_mount *mp,
143 xfs_lsn_t lsn,
144 uint flags);
145int xfs_log_mount(struct xfs_mount *mp,
146 struct xfs_buftarg *log_target,
147 xfs_daddr_t start_block,
148 int num_bblocks);
149int xfs_log_mount_finish(struct xfs_mount *mp, int);
150void xfs_log_move_tail(struct xfs_mount *mp,
151 xfs_lsn_t tail_lsn);
152int xfs_log_notify(struct xfs_mount *mp,
153 void *iclog,
154 xfs_log_callback_t *callback_entry);
155int xfs_log_release_iclog(struct xfs_mount *mp,
156 void *iclog_hndl);
157int xfs_log_reserve(struct xfs_mount *mp,
158 int length,
159 int count,
160 xfs_log_ticket_t *ticket,
161 __uint8_t clientid,
162 uint flags);
163int xfs_log_write(struct xfs_mount *mp,
164 xfs_log_iovec_t region[],
165 int nentries,
166 xfs_log_ticket_t ticket,
167 xfs_lsn_t *start_lsn);
168int xfs_log_unmount(struct xfs_mount *mp);
169int xfs_log_unmount_write(struct xfs_mount *mp);
170void xfs_log_unmount_dealloc(struct xfs_mount *mp);
171int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
172int xfs_log_need_covered(struct xfs_mount *mp);
173
174void xlog_iodone(struct xfs_buf *);
175
176#endif
177
178
179extern int xlog_debug; /* set to 1 to enable real log */
180
181
182#endif /* __XFS_LOG_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-30 18:34:27 -0500