diff options
Diffstat (limited to 'fs/jffs/jffs_proc.c')
| -rw-r--r-- | fs/jffs/jffs_proc.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/fs/jffs/jffs_proc.c b/fs/jffs/jffs_proc.c new file mode 100644 index 000000000000..9bdd99a557c2 --- /dev/null +++ b/fs/jffs/jffs_proc.c @@ -0,0 +1,261 @@ +/* + * 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; +} |