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1da177e4 LT |
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 | */ | |
47 | static | |
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 | |
53 | xfs_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 | ||
117 | typedef 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 | ||
122 | typedef 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 | */ | |
128 | typedef 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 */ | |
137 | struct xfs_mount; | |
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 xfs_log_mount(struct xfs_mount *mp, | |
146 | struct xfs_buftarg *log_target, | |
147 | xfs_daddr_t start_block, | |
148 | int num_bblocks); | |
149 | int xfs_log_mount_finish(struct xfs_mount *mp, int); | |
150 | void xfs_log_move_tail(struct xfs_mount *mp, | |
151 | xfs_lsn_t tail_lsn); | |
152 | int xfs_log_notify(struct xfs_mount *mp, | |
153 | void *iclog, | |
154 | xfs_log_callback_t *callback_entry); | |
155 | int xfs_log_release_iclog(struct xfs_mount *mp, | |
156 | void *iclog_hndl); | |
157 | int 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); | |
163 | int 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); | |
168 | int xfs_log_unmount(struct xfs_mount *mp); | |
169 | int xfs_log_unmount_write(struct xfs_mount *mp); | |
170 | void xfs_log_unmount_dealloc(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 | #endif | |
177 | ||
178 | ||
179 | extern int xlog_debug; /* set to 1 to enable real log */ | |
180 | ||
181 | ||
182 | #endif /* __XFS_LOG_H__ */ |