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-rw-r--r--fs/jffs2/summary.h183
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diff --git a/fs/jffs2/summary.h b/fs/jffs2/summary.h
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1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * Zoltan Sogor <weth@inf.u-szeged.hu>,
6 * Patrik Kluba <pajko@halom.u-szeged.hu>,
7 * University of Szeged, Hungary
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 * $Id: summary.h,v 1.1 2005/09/07 08:34:54 havasi Exp $
12 *
13 */
14
15#ifndef JFFS2_SUMMARY_H
16#define JFFS2_SUMMARY_H
17
18#include <linux/uio.h>
19#include <linux/jffs2.h>
20
21#define DIRTY_SPACE(x) do { typeof(x) _x = (x); \
22 c->free_size -= _x; c->dirty_size += _x; \
23 jeb->free_size -= _x ; jeb->dirty_size += _x; \
24 }while(0)
25#define USED_SPACE(x) do { typeof(x) _x = (x); \
26 c->free_size -= _x; c->used_size += _x; \
27 jeb->free_size -= _x ; jeb->used_size += _x; \
28 }while(0)
29#define WASTED_SPACE(x) do { typeof(x) _x = (x); \
30 c->free_size -= _x; c->wasted_size += _x; \
31 jeb->free_size -= _x ; jeb->wasted_size += _x; \
32 }while(0)
33#define UNCHECKED_SPACE(x) do { typeof(x) _x = (x); \
34 c->free_size -= _x; c->unchecked_size += _x; \
35 jeb->free_size -= _x ; jeb->unchecked_size += _x; \
36 }while(0)
37
38#define BLK_STATE_ALLFF 0
39#define BLK_STATE_CLEAN 1
40#define BLK_STATE_PARTDIRTY 2
41#define BLK_STATE_CLEANMARKER 3
42#define BLK_STATE_ALLDIRTY 4
43#define BLK_STATE_BADBLOCK 5
44
45#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
46#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
47#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
48
49/* Summary structures used on flash */
50
51struct jffs2_sum_unknown_flash
52{
53 jint16_t nodetype; /* node type */
54};
55
56struct jffs2_sum_inode_flash
57{
58 jint16_t nodetype; /* node type */
59 jint32_t inode; /* inode number */
60 jint32_t version; /* inode version */
61 jint32_t offset; /* offset on jeb */
62 jint32_t totlen; /* record length */
63} __attribute__((packed));
64
65struct jffs2_sum_dirent_flash
66{
67 jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
68 jint32_t totlen; /* record length */
69 jint32_t offset; /* offset on jeb */
70 jint32_t pino; /* parent inode */
71 jint32_t version; /* dirent version */
72 jint32_t ino; /* == zero for unlink */
73 uint8_t nsize; /* dirent name size */
74 uint8_t type; /* dirent type */
75 uint8_t name[0]; /* dirent name */
76} __attribute__((packed));
77
78union jffs2_sum_flash
79{
80 struct jffs2_sum_unknown_flash u;
81 struct jffs2_sum_inode_flash i;
82 struct jffs2_sum_dirent_flash d;
83};
84
85/* Summary structures used in the memory */
86
87struct jffs2_sum_unknown_mem
88{
89 union jffs2_sum_mem *next;
90 jint16_t nodetype; /* node type */
91};
92
93struct jffs2_sum_inode_mem
94{
95 union jffs2_sum_mem *next;
96 jint16_t nodetype; /* node type */
97 jint32_t inode; /* inode number */
98 jint32_t version; /* inode version */
99 jint32_t offset; /* offset on jeb */
100 jint32_t totlen; /* record length */
101} __attribute__((packed));
102
103struct jffs2_sum_dirent_mem
104{
105 union jffs2_sum_mem *next;
106 jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
107 jint32_t totlen; /* record length */
108 jint32_t offset; /* ofset on jeb */
109 jint32_t pino; /* parent inode */
110 jint32_t version; /* dirent version */
111 jint32_t ino; /* == zero for unlink */
112 uint8_t nsize; /* dirent name size */
113 uint8_t type; /* dirent type */
114 uint8_t name[0]; /* dirent name */
115} __attribute__((packed));
116
117union jffs2_sum_mem
118{
119 struct jffs2_sum_unknown_mem u;
120 struct jffs2_sum_inode_mem i;
121 struct jffs2_sum_dirent_mem d;
122};
123
124/* Summary related information stored in superblock */
125
126struct jffs2_summary
127{
128 uint32_t sum_size; /* collected summary information for nextblock */
129 uint32_t sum_num;
130 uint32_t sum_padded;
131 union jffs2_sum_mem *sum_list_head;
132 union jffs2_sum_mem *sum_list_tail;
133
134 jint32_t *sum_buf; /* buffer for writing out summary */
135};
136
137/* Summary marker is stored at the end of every sumarized erase block */
138
139struct jffs2_sum_marker
140{
141 jint32_t offset; /* offset of the summary node in the jeb */
142 jint32_t magic; /* == JFFS2_SUM_MAGIC */
143};
144
145#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_summary_node) + sizeof(struct jffs2_sum_marker))
146
147#ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */
148
149#define jffs2_sum_active() (1)
150int jffs2_sum_init(struct jffs2_sb_info *c);
151void jffs2_sum_exit(struct jffs2_sb_info *c);
152void jffs2_sum_disable_collecting(struct jffs2_summary *s);
153int jffs2_sum_is_disabled(struct jffs2_summary *s);
154void jffs2_sum_reset_collected(struct jffs2_summary *s);
155void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
156int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
157 unsigned long count, uint32_t to);
158int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
159int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
160int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
161int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
162int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
163 uint32_t ofs, uint32_t *pseudo_random);
164
165#else /* SUMMARY DISABLED */
166
167#define jffs2_sum_active() (0)
168#define jffs2_sum_init(a) (0)
169#define jffs2_sum_exit(a)
170#define jffs2_sum_disable_collecting(a)
171#define jffs2_sum_is_disabled(a) (0)
172#define jffs2_sum_reset_collected(a)
173#define jffs2_sum_add_kvec(a,b,c,d) (0)
174#define jffs2_sum_move_collected(a,b)
175#define jffs2_sum_write_sumnode(a) (0)
176#define jffs2_sum_add_padding_mem(a,b)
177#define jffs2_sum_add_inode_mem(a,b,c)
178#define jffs2_sum_add_dirent_mem(a,b,c)
179#define jffs2_sum_scan_sumnode(a,b,c,d) (0)
180
181#endif /* CONFIG_JFFS2_SUMMARY */
182
183#endif /* JFFS2_SUMMARY_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 18:15:38 -0500