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/*
* 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/sched.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 = 0;
/*
* 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(kdev_t dev, struct jffs_control *c)
{
struct jffs_partition_dir *part_dir;
struct proc_dir_entry *part_info = 0;
struct proc_dir_entry *part_layout = 0;
struct proc_dir_entry *part_root = 0;
/* Allocate structure for local JFFS partition table */
if (!(part_dir = (struct jffs_partition_dir *)
kmalloc (sizeof (struct jffs_partition_dir), GFP_KERNEL))) {
return -ENOMEM;
}
/* Create entry for this partition */
if ((part_root = create_proc_entry (kdevname(dev),
S_IFDIR | S_IRUGO | S_IXUGO, jffs_proc_root))) {
part_root->read_proc = jffs_proc_info_read;
part_root->data = (void *) c;
}
else {
kfree (part_dir);
return -ENOMEM;
}
/* Create entry for 'info' file */
if ((part_info = create_proc_entry ("info", 0, part_root))) {
part_info->read_proc = jffs_proc_info_read;
part_info->data = (void *) c;
}
else {
remove_proc_entry (part_root->name, jffs_proc_root);
kfree (part_dir);
return -ENOMEM;
}
/* Create entry for 'layout' file */
if ((part_layout = create_proc_entry ("layout", 0, part_root))) {
part_layout->read_proc = jffs_proc_layout_read;
part_layout->data = (void *) c;
}
else {
remove_proc_entry (part_info->name, part_root);
remove_proc_entry (part_root->name, jffs_proc_root);
kfree (part_dir);
return -ENOMEM;
}
/* 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;
}
/*
* 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 = 0;
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)
#if LINUX_VERSION_CODE < 0x020300
remove_proc_entry ("jffs", &proc_root_fs);
#else
remove_proc_entry ("jffs", proc_root_fs);
#endif
/* 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 = 0;
struct jffs_fm *last_fm = 0;
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;
}
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