1 /*
2 * JFFS -- Journaling Flash File System, Linux implementation.
3 *
4 * Copyright (C) 1999, 2000 Axis Communications AB.
5 *
6 * Created by Finn Hakansson <finn@axis.com>.
7 *
8 * This is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * $Id: intrep.h,v 1.11 2000/08/17 22:46:46 bmatthews Exp $
14 *
15 */
16
17 #ifndef __LINUX_JFFS_INTREP_H__
18 #define __LINUX_JFFS_INTREP_H__
19 #include "jffs_fm.h"
20 inline int jffs_min(int a, int b);
21 inline int jffs_max(int a, int b);
22 __u32 jffs_checksum(const void *data, int size);
23
24 void jffs_cleanup_control(struct jffs_control *c);
25 int jffs_build_fs(struct super_block *sb);
26
27 int jffs_insert_node(struct jffs_control *c, struct jffs_file *f,
28 const struct jffs_raw_inode *raw_inode,
29 const char *name, struct jffs_node *node);
30 struct jffs_file *jffs_find_file(struct jffs_control *c, __u32 ino);
31 struct jffs_file *jffs_find_child(struct jffs_file *dir, const char *name, int len);
32
33 void jffs_free_node(struct jffs_node *node);
34
35 int jffs_foreach_file(struct jffs_control *c, int (*func)(struct jffs_file *));
36 int jffs_free_node_list(struct jffs_file *f);
37 int jffs_free_file(struct jffs_file *f);
38 int jffs_possibly_delete_file(struct jffs_file *f);
39 int jffs_build_file(struct jffs_file *f);
40 int jffs_insert_file_into_hash(struct jffs_file *f);
41 int jffs_insert_file_into_tree(struct jffs_file *f);
42 int jffs_unlink_file_from_hash(struct jffs_file *f);
43 int jffs_unlink_file_from_tree(struct jffs_file *f);
44 int jffs_remove_redundant_nodes(struct jffs_file *f);
45 int jffs_file_count(struct jffs_file *f);
46
47 int jffs_write_node(struct jffs_control *c, struct jffs_node *node,
48 struct jffs_raw_inode *raw_inode,
49 const char *name, const unsigned char *buf,
50 int recoverable, struct jffs_file *f);
51 int jffs_read_data(struct jffs_file *f, unsigned char *buf, __u32 read_offset, __u32 size);
52
53 /* Garbage collection stuff. */
54 int jffs_garbage_collect_thread(void *c);
55 void jffs_garbage_collect_trigger(struct jffs_control *c);
56 int jffs_garbage_collect_now(struct jffs_control *c);
57
58 /* Is there enough space on the flash? */
59 static inline int JFFS_ENOUGH_SPACE(struct jffs_control *c, __u32 space)
60 {
61 struct jffs_fmcontrol *fmc = c->fmc;
62
63 while (1) {
64 if ((fmc->flash_size - (fmc->used_size + fmc->dirty_size))
65 >= fmc->min_free_size + space) {
66 return 1;
67 }
68 if (fmc->dirty_size < fmc->sector_size)
69 return 0;
70
71 if (jffs_garbage_collect_now(c)) {
72 D1(printk("JFFS_ENOUGH_SPACE: jffs_garbage_collect_now() failed.\n"));
73 return 0;
74 }
75 }
76 }
77
78 /* For debugging purposes. */
79 void jffs_print_node(struct jffs_node *n);
80 void jffs_print_raw_inode(struct jffs_raw_inode *raw_inode);
81 int jffs_print_file(struct jffs_file *f);
82 void jffs_print_hash_table(struct jffs_control *c);
83 void jffs_print_tree(struct jffs_file *first_file, int indent);
84
85 struct buffer_head *jffs_get_write_buffer(kdev_t dev, int block);
86 void jffs_put_write_buffer(struct buffer_head *bh);
87
88 #endif /* __LINUX_JFFS_INTREP_H__ */
89
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