1 /*
2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License version 2.1 as
11 * published by the Free Software Foundation.
12 *
13 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
14 */
15
16 /*
17 * This file is just holds extra declarations of macros that would normally
18 * be providesd in the Linux kernel. These macros have been written from
19 * scratch but are functionally equivalent to the Linux ones.
20 *
21 */
22
23 #ifndef __EXTRAS_H__
24 #define __EXTRAS_H__
25
26
27 #if !(defined __KERNEL__)
28
29 /* Definition of types */
30 typedef unsigned char __u8;
31 typedef unsigned short __u16;
32 typedef unsigned __u32;
33
34 #endif
35
36 /*
37 * This is a simple doubly linked list implementation that matches the
38 * way the Linux kernel doubly linked list implementation works.
39 */
40
41 struct ylist_head {
42 struct ylist_head *next; /* next in chain */
43 struct ylist_head *prev; /* previous in chain */
44 };
45
46
47 /* Initialise a static list */
48 #define YLIST_HEAD(name) \
49 struct ylist_head name = { &(name), &(name)}
50
51
52
53 /* Initialise a list head to an empty list */
54 #define YINIT_LIST_HEAD(p) \
55 do { \
56 (p)->next = (p);\
57 (p)->prev = (p); \
58 } while (0)
59
60
61 /* Add an element to a list */
ylist_add(struct ylist_head * newEntry,struct ylist_head * list)62 static __inline__ void ylist_add(struct ylist_head *newEntry,
63 struct ylist_head *list)
64 {
65 struct ylist_head *listNext = list->next;
66
67 list->next = newEntry;
68 newEntry->prev = list;
69 newEntry->next = listNext;
70 listNext->prev = newEntry;
71
72 }
73
ylist_add_tail(struct ylist_head * newEntry,struct ylist_head * list)74 static __inline__ void ylist_add_tail(struct ylist_head *newEntry,
75 struct ylist_head *list)
76 {
77 struct ylist_head *listPrev = list->prev;
78
79 list->prev = newEntry;
80 newEntry->next = list;
81 newEntry->prev = listPrev;
82 listPrev->next = newEntry;
83
84 }
85
86
87 /* Take an element out of its current list, with or without
88 * reinitialising the links.of the entry*/
ylist_del(struct ylist_head * entry)89 static __inline__ void ylist_del(struct ylist_head *entry)
90 {
91 struct ylist_head *listNext = entry->next;
92 struct ylist_head *listPrev = entry->prev;
93
94 listNext->prev = listPrev;
95 listPrev->next = listNext;
96
97 }
98
ylist_del_init(struct ylist_head * entry)99 static __inline__ void ylist_del_init(struct ylist_head *entry)
100 {
101 ylist_del(entry);
102 entry->next = entry->prev = entry;
103 }
104
105
106 /* Test if the list is empty */
ylist_empty(struct ylist_head * entry)107 static __inline__ int ylist_empty(struct ylist_head *entry)
108 {
109 return (entry->next == entry);
110 }
111
112
113 /* ylist_entry takes a pointer to a list entry and offsets it to that
114 * we can find a pointer to the object it is embedded in.
115 */
116
117
118 #define ylist_entry(entry, type, member) \
119 ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
120
121
122 /* ylist_for_each and list_for_each_safe iterate over lists.
123 * ylist_for_each_safe uses temporary storage to make the list delete safe
124 */
125
126 #define ylist_for_each(itervar, list) \
127 for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
128
129 #define ylist_for_each_safe(itervar, saveVar, list) \
130 for (itervar = (list)->next, saveVar = (list)->next->next; \
131 itervar != (list); itervar = saveVar, saveVar = saveVar->next)
132
133
134 #if !(defined __KERNEL__)
135
136
137 #ifndef WIN32
138 #include <sys/stat.h>
139 #endif
140
141
142 #ifdef CONFIG_YAFFS_PROVIDE_DEFS
143 /* File types */
144
145
146 #define DT_UNKNOWN 0
147 #define DT_FIFO 1
148 #define DT_CHR 2
149 #define DT_DIR 4
150 #define DT_BLK 6
151 #define DT_REG 8
152 #define DT_LNK 10
153 #define DT_SOCK 12
154 #define DT_WHT 14
155
156
157 #ifndef WIN32
158 #include <sys/stat.h>
159 #endif
160
161 /*
162 * Attribute flags. These should be or-ed together to figure out what
163 * has been changed!
164 */
165 #define ATTR_MODE 1
166 #define ATTR_UID 2
167 #define ATTR_GID 4
168 #define ATTR_SIZE 8
169 #define ATTR_ATIME 16
170 #define ATTR_MTIME 32
171 #define ATTR_CTIME 64
172
173 struct iattr {
174 unsigned int ia_valid;
175 unsigned ia_mode;
176 unsigned ia_uid;
177 unsigned ia_gid;
178 unsigned ia_size;
179 unsigned ia_atime;
180 unsigned ia_mtime;
181 unsigned ia_ctime;
182 unsigned int ia_attr_flags;
183 };
184
185 #endif
186
187 #else
188
189 #include <linux/types.h>
190 #include <linux/fs.h>
191 #include <linux/stat.h>
192
193 #endif
194
195
196 #endif
197