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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2001 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_BUF_ITEM_H__ | |
33 | #define __XFS_BUF_ITEM_H__ | |
34 | ||
35 | /* | |
36 | * This is the structure used to lay out a buf log item in the | |
37 | * log. The data map describes which 128 byte chunks of the buffer | |
38 | * have been logged. This structure works only on buffers that | |
39 | * reside up to the first TB in the filesystem. These buffers are | |
40 | * generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF. | |
41 | */ | |
42 | typedef struct xfs_buf_log_format_v1 { | |
43 | unsigned short blf_type; /* buf log item type indicator */ | |
44 | unsigned short blf_size; /* size of this item */ | |
45 | __int32_t blf_blkno; /* starting blkno of this buf */ | |
46 | ushort blf_flags; /* misc state */ | |
47 | ushort blf_len; /* number of blocks in this buf */ | |
48 | unsigned int blf_map_size; /* size of data bitmap in words */ | |
49 | unsigned int blf_data_map[1];/* variable size bitmap of */ | |
50 | /* regions of buffer in this item */ | |
51 | } xfs_buf_log_format_v1_t; | |
52 | ||
53 | /* | |
54 | * This is a form of the above structure with a 64 bit blkno field. | |
55 | * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything. | |
56 | */ | |
57 | typedef struct xfs_buf_log_format_t { | |
58 | unsigned short blf_type; /* buf log item type indicator */ | |
59 | unsigned short blf_size; /* size of this item */ | |
60 | ushort blf_flags; /* misc state */ | |
61 | ushort blf_len; /* number of blocks in this buf */ | |
62 | __int64_t blf_blkno; /* starting blkno of this buf */ | |
63 | unsigned int blf_map_size; /* size of data bitmap in words */ | |
64 | unsigned int blf_data_map[1];/* variable size bitmap of */ | |
65 | /* regions of buffer in this item */ | |
66 | } xfs_buf_log_format_t; | |
67 | ||
68 | /* | |
69 | * This flag indicates that the buffer contains on disk inodes | |
70 | * and requires special recovery handling. | |
71 | */ | |
72 | #define XFS_BLI_INODE_BUF 0x1 | |
73 | /* | |
74 | * This flag indicates that the buffer should not be replayed | |
75 | * during recovery because its blocks are being freed. | |
76 | */ | |
77 | #define XFS_BLI_CANCEL 0x2 | |
78 | /* | |
79 | * This flag indicates that the buffer contains on disk | |
80 | * user or group dquots and may require special recovery handling. | |
81 | */ | |
82 | #define XFS_BLI_UDQUOT_BUF 0x4 | |
83 | /* #define XFS_BLI_PDQUOT_BUF 0x8 */ | |
84 | #define XFS_BLI_GDQUOT_BUF 0x10 | |
85 | ||
86 | #define XFS_BLI_CHUNK 128 | |
87 | #define XFS_BLI_SHIFT 7 | |
88 | #define BIT_TO_WORD_SHIFT 5 | |
89 | #define NBWORD (NBBY * sizeof(unsigned int)) | |
90 | ||
91 | /* | |
92 | * buf log item flags | |
93 | */ | |
94 | #define XFS_BLI_HOLD 0x01 | |
95 | #define XFS_BLI_DIRTY 0x02 | |
96 | #define XFS_BLI_STALE 0x04 | |
97 | #define XFS_BLI_LOGGED 0x08 | |
98 | #define XFS_BLI_INODE_ALLOC_BUF 0x10 | |
99 | #define XFS_BLI_STALE_INODE 0x20 | |
100 | ||
101 | ||
102 | #ifdef __KERNEL__ | |
103 | ||
104 | struct xfs_buf; | |
105 | struct ktrace; | |
106 | struct xfs_mount; | |
107 | struct xfs_buf_log_item; | |
108 | ||
109 | #if defined(XFS_BLI_TRACE) | |
110 | #define XFS_BLI_TRACE_SIZE 32 | |
111 | ||
112 | void xfs_buf_item_trace(char *, struct xfs_buf_log_item *); | |
113 | #else | |
114 | #define xfs_buf_item_trace(id, bip) | |
115 | #endif | |
116 | ||
117 | /* | |
118 | * This is the in core log item structure used to track information | |
119 | * needed to log buffers. It tracks how many times the lock has been | |
120 | * locked, and which 128 byte chunks of the buffer are dirty. | |
121 | */ | |
122 | typedef struct xfs_buf_log_item { | |
123 | xfs_log_item_t bli_item; /* common item structure */ | |
124 | struct xfs_buf *bli_buf; /* real buffer pointer */ | |
125 | unsigned int bli_flags; /* misc flags */ | |
126 | unsigned int bli_recur; /* lock recursion count */ | |
127 | atomic_t bli_refcount; /* cnt of tp refs */ | |
128 | #ifdef XFS_BLI_TRACE | |
129 | struct ktrace *bli_trace; /* event trace buf */ | |
130 | #endif | |
131 | #ifdef XFS_TRANS_DEBUG | |
132 | char *bli_orig; /* original buffer copy */ | |
133 | char *bli_logged; /* bytes logged (bitmap) */ | |
134 | #endif | |
135 | xfs_buf_log_format_t bli_format; /* in-log header */ | |
136 | } xfs_buf_log_item_t; | |
137 | ||
138 | /* | |
139 | * This structure is used during recovery to record the buf log | |
140 | * items which have been canceled and should not be replayed. | |
141 | */ | |
142 | typedef struct xfs_buf_cancel { | |
143 | xfs_daddr_t bc_blkno; | |
144 | uint bc_len; | |
145 | int bc_refcount; | |
146 | struct xfs_buf_cancel *bc_next; | |
147 | } xfs_buf_cancel_t; | |
148 | ||
149 | void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); | |
150 | void xfs_buf_item_relse(struct xfs_buf *); | |
151 | void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); | |
152 | uint xfs_buf_item_dirty(xfs_buf_log_item_t *); | |
153 | void xfs_buf_attach_iodone(struct xfs_buf *, | |
154 | void(*)(struct xfs_buf *, xfs_log_item_t *), | |
155 | xfs_log_item_t *); | |
156 | void xfs_buf_iodone_callbacks(struct xfs_buf *); | |
157 | void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *); | |
158 | ||
159 | #ifdef XFS_TRANS_DEBUG | |
160 | void | |
161 | xfs_buf_item_flush_log_debug( | |
162 | struct xfs_buf *bp, | |
163 | uint first, | |
164 | uint last); | |
165 | #else | |
166 | #define xfs_buf_item_flush_log_debug(bp, first, last) | |
167 | #endif | |
168 | ||
169 | #endif /* __KERNEL__ */ | |
170 | ||
171 | #endif /* __XFS_BUF_ITEM_H__ */ |