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/*
* MBUFF kernel virtual memory driver for Linux,
* Proc filesystem interface
*
* Copyright (C) 1999, David Edwards <wavefrnt@tampabay.rr.com>
*
*
* Much of this code is based on linux/drivers/block/ide-proc.c
*
* Copyright (C) 1997-1998, Mark Lord
*
*/
#include <linux/proc_fs.h>
#include "mbuff.h"
#include "kernel_compat.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
static struct proc_dir_entry *root, *regions;
/*
* Helper function to compute buffer pointers and sizes
*/
static int proc_mbuff_read_return(char *page, char **start, off_t off,
int count, int *eof, int len)
{
len -= off;
if (len < count)
{
*eof = 1;
if (len <= 0)
return 0;
}
else
len = count;
*start = page + off;
return len;
}
/*
* Read proc to display mbuff version
*/
static int proc_mbuff_read_version(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
out += sprintf(out, "%s\n", MBUFF_VERSION);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Read proc to display size for a region
*/
static int proc_mbuff_read_size(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
struct mbuff *mbuff = (struct mbuff *) data;
out += sprintf(out, "%ld\n", mbuff->size);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Read proc to display user space allocation count for a region
*/
static int proc_mbuff_read_count(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
struct mbuff *mbuff = (struct mbuff *) data;
out += sprintf(out, "%d\n", mbuff->count);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Read proc to display kernal space allocation count for a region
*/
static int proc_mbuff_read_kcount(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
struct mbuff *mbuff = (struct mbuff *) data;
out += sprintf(out, "%d\n", mbuff->kcount);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Read proc to display open count for a region
*/
static int proc_mbuff_read_opencnt(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
struct mbuff *mbuff = (struct mbuff *) data;
out += sprintf(out, "%d\n", mbuff->open_cnt);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Read proc to display open mode for a region
*/
static int proc_mbuff_read_openmode(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *out = page;
int len;
struct mbuff *mbuff = (struct mbuff *) data;
out += sprintf(out, "%d\n", mbuff->open_mode);
len = out - page;
return proc_mbuff_read_return(page, start, off, count, eof, len);
}
/*
* Create an mbuff region's proc entry, called from mbuff_list_add
*/
void proc_mbuff_add_mbuff(struct mbuff *mbuff)
{
struct proc_dir_entry *region, *ent;
region = create_proc_entry(mbuff->name, S_IFDIR, regions);
ent = create_proc_entry("size", 0, region);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_size;
ent->data = mbuff;
ent = create_proc_entry("count", 0, region);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_count;
ent->data = mbuff;
ent = create_proc_entry("kcount", 0, region);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_kcount;
ent->data = mbuff;
ent = create_proc_entry("open_cnt", 0, region);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_opencnt;
ent->data = mbuff;
ent = create_proc_entry("open_mode", 0, region);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_openmode;
ent->data = mbuff;
}
/*
* Remove an mbuff region's proc entry, called from mbuff_list_remove
*/
void proc_mbuff_remove_mbuff(struct mbuff *mbuff)
{
remove_proc_entry(mbuff->name, regions);
}
/*
* Create a "directory" in the /proc file system for mbuff
*/
void proc_mbuff_create(void)
{
struct proc_dir_entry *ent;
root = create_proc_entry("mbuff", S_IFDIR, 0);
if (!root)
return;
/* regions is a directory containing a directory for each region */
regions = create_proc_entry("regions", S_IFDIR, root);
/* regions is a directory containing a directory for each region */
ent = create_proc_entry("version", 0, root);
if (!ent)
return;
ent->read_proc = proc_mbuff_read_version;
}
/*
* Remove the mbuff hierarchy from the /proc file system for mbuff
*/
void proc_mbuff_destroy(void)
{
remove_proc_entry("mbuff/regions", 0);
remove_proc_entry("mbuff/version", 0);
remove_proc_entry("mbuff", 0);
}
#else
void proc_mbuff_create(void)
{
}
void proc_mbuff_destroy(void)
{
}
void proc_mbuff_add_mbuff(struct mbuff *mbuff)
{
}
void proc_mbuff_remove_mbuff(struct mbuff *mbuff)
{
}
#endif
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