aboutsummaryrefslogtreecommitdiffstats
path: root/fs/jffs/jffs_proc.c
blob: 9bdd99a557c27dde4659f46ec0f180f2a58ddf52 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/*
 * JFFS -- Journaling Flash File System, Linux implementation.
 *
 * Copyright (C) 2000  Axis Communications AB.
 *
 * Created by Simon Kagstrom <simonk@axis.com>.
 *
 * $Id: jffs_proc.c,v 1.5 2001/06/02 14:34:55 dwmw2 Exp $
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 *  Overview:
 *   This file defines JFFS partition entries in the proc file system.
 *
 *  TODO:
 *   Create some more proc files for different kinds of info, i.e. statistics
 *   about written and read bytes, number of calls to different routines,
 *   reports about failures.
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/jffs.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/time.h>
#include <linux/types.h>
#include "jffs_fm.h"
#include "jffs_proc.h"

/*
 * Structure for a JFFS partition in the system
 */
struct jffs_partition_dir {
	struct jffs_control *c;
	struct proc_dir_entry *part_root;
	struct proc_dir_entry *part_info;
	struct proc_dir_entry *part_layout;
	struct jffs_partition_dir *next;
};

/*
 * Structure for top-level entry in '/proc/fs' directory
 */
struct proc_dir_entry *jffs_proc_root;

/*
 * Linked list of 'jffs_partition_dirs' to help us track
 * the mounted JFFS partitions in the system
 */
static struct jffs_partition_dir *jffs_part_dirs;

/*
 * Read functions for entries
 */
static int jffs_proc_info_read(char *page, char **start, off_t off,
		int count, int *eof, void *data);
static int jffs_proc_layout_read (char *page, char **start, off_t off,
		int count, int *eof, void *data);


/*
 * Register a JFFS partition directory (called upon mount)
 */
int jffs_register_jffs_proc_dir(int mtd, struct jffs_control *c)
{
	struct jffs_partition_dir *part_dir;
	struct proc_dir_entry *part_info = NULL;
	struct proc_dir_entry *part_layout = NULL;
	struct proc_dir_entry *part_root = NULL;
	char name[10];

	sprintf(name, "%d", mtd);
	/* Allocate structure for local JFFS partition table */
	part_dir = (struct jffs_partition_dir *)
		kmalloc(sizeof (struct jffs_partition_dir), GFP_KERNEL);
	if (!part_dir)
		goto out;

	/* Create entry for this partition */
	part_root = proc_mkdir(name, jffs_proc_root);
	if (!part_root)
		goto out1;

	/* Create entry for 'info' file */
	part_info = create_proc_entry ("info", 0, part_root);
	if (!part_info)
		goto out2;
	part_info->read_proc = jffs_proc_info_read;
	part_info->data = (void *) c;

	/* Create entry for 'layout' file */
	part_layout = create_proc_entry ("layout", 0, part_root);
	if (!part_layout)
		goto out3;
	part_layout->read_proc = jffs_proc_layout_read;
	part_layout->data = (void *) c;

	/* Fill in structure for table and insert in the list */
	part_dir->c = c;
	part_dir->part_root = part_root;
	part_dir->part_info = part_info;
	part_dir->part_layout = part_layout;
	part_dir->next = jffs_part_dirs;
	jffs_part_dirs = part_dir;

	/* Return happy */
	return 0;

out3:
	remove_proc_entry("info", part_root);
out2:
	remove_proc_entry(name, jffs_proc_root);
out1:
	kfree(part_dir);
out:
	return -ENOMEM;
}


/*
 * Unregister a JFFS partition directory (called at umount)
 */
int jffs_unregister_jffs_proc_dir(struct jffs_control *c)
{
	struct jffs_partition_dir *part_dir = jffs_part_dirs;
	struct jffs_partition_dir *prev_part_dir = NULL;

	while (part_dir) {
		if (part_dir->c == c) {
			/* Remove entries for partition */
			remove_proc_entry (part_dir->part_info->name,
				part_dir->part_root);
			remove_proc_entry (part_dir->part_layout->name,
				part_dir->part_root);
			remove_proc_entry (part_dir->part_root->name,
				jffs_proc_root);

			/* Remove entry from list */
			if (prev_part_dir)
				prev_part_dir->next = part_dir->next;
			else
				jffs_part_dirs = part_dir->next;

			/*
			 * Check to see if this is the last one
			 * and remove the entry from '/proc/fs'
			 * if it is.
			 */
			if (jffs_part_dirs == part_dir->next)
				remove_proc_entry ("jffs", proc_root_fs);

			/* Free memory for entry */
			kfree(part_dir);

			/* Return happy */
			return 0;
		}

		/* Move to next entry */
		prev_part_dir = part_dir;
		part_dir = part_dir->next;
	}

	/* Return unhappy */
	return -1;
}


/*
 * Read a JFFS partition's `info' file
 */
static int jffs_proc_info_read (char *page, char **start, off_t off,
		int count, int *eof, void *data)
{
	struct jffs_control *c = (struct jffs_control *) data;
	int len = 0;

	/* Get information on the parition */
	len += sprintf (page,
		"partition size:     %08lX (%u)\n"
		"sector size:        %08lX (%u)\n"
		"used size:          %08lX (%u)\n"
		"dirty size:         %08lX (%u)\n"
		"free size:          %08lX (%u)\n\n",
		(unsigned long) c->fmc->flash_size, c->fmc->flash_size,
		(unsigned long) c->fmc->sector_size, c->fmc->sector_size,
		(unsigned long) c->fmc->used_size, c->fmc->used_size,
		(unsigned long) c->fmc->dirty_size, c->fmc->dirty_size,
		(unsigned long) (c->fmc->flash_size -
			(c->fmc->used_size + c->fmc->dirty_size)),
		c->fmc->flash_size - (c->fmc->used_size + c->fmc->dirty_size));

	/* We're done */
	*eof = 1;

	/* Return length */
	return len;
}


/*
 * Read a JFFS partition's `layout' file
 */
static int jffs_proc_layout_read (char *page, char **start, off_t off,
		int count, int *eof, void *data)
{
	struct jffs_control *c = (struct jffs_control *) data;
	struct jffs_fm *fm = NULL;
	struct jffs_fm *last_fm = NULL;
	int len = 0;

	/* Get the first item in the list */
 	fm = c->fmc->head;

	/* Print free space */
	if (fm && fm->offset) {
		len += sprintf (page, "00000000 %08lX free\n",
			(unsigned long) fm->offset);
	}

	/* Loop through all of the flash control structures */
	while (fm && (len < (off + count))) {
		if (fm->nodes) {
			len += sprintf (page + len,
				"%08lX %08lX ino=%08lX, ver=%08lX\n",
				(unsigned long) fm->offset,
				(unsigned long) fm->size,
				(unsigned long) fm->nodes->node->ino,
				(unsigned long) fm->nodes->node->version);
		}
		else {
			len += sprintf (page + len,
				"%08lX %08lX dirty\n",
				(unsigned long) fm->offset,
				(unsigned long) fm->size);
		}
		last_fm = fm;
		fm = fm->next;
	}

	/* Print free space */
	if ((len < (off + count)) && last_fm
	    && (last_fm->offset < c->fmc->flash_size)) {
		len += sprintf (page + len,
			       "%08lX %08lX free\n",
			       (unsigned long) last_fm->offset + 
				last_fm->size,
			       (unsigned long) (c->fmc->flash_size -
						    (last_fm->offset + last_fm->size)));
	}

	/* We're done */
	*eof = 1;

	/* Return length */
	return len;
}