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/*
* xl_segment_proc.c
*
* XenoLinux virtual disk proc interface .
*/
#include "xl_block.h"
#include <linux/proc_fs.h>
#include <linux/delay.h>
static struct proc_dir_entry *vhd;
static int proc_read_vhd(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
return 0;
}
#define isdelim(c) \
(c==' '||c==','||c=='\n'||c=='\r'||c=='\t'||c==':'||c=='('||c==')' ? 1 : 0)
char *get_string(char *string) /* a bit like strtok */
{
static char *temp;
int loop = 0;
if (string != NULL)
temp = string;
else
string = temp;
try_again:
while (!isdelim(string[loop]))
{
if (string[loop] == '\0')
return NULL;
loop++;
}
string[loop] = '\0';
temp = (string + loop + 1);
if (loop == 0)
{
string = temp;
goto try_again;
}
return string;
}
#define isdigit(c) (c >= '0' && c <= '9' ? 1 : 0)
unsigned long to_number(char *string) /* atoi */
{
unsigned long value = 0;
if (string == NULL) return 0;
while (!isdigit(*string) && *string != '\0') string++;
while (isdigit(*string))
{
value = value * 10 + (*string - '0');
string++;
}
return value;
}
static int proc_write_vhd(struct file *file, const char *buffer,
unsigned long count, void *data)
{
char *local = kmalloc((count + 1) * sizeof(char), GFP_KERNEL);
char *string;
int loop;
xv_disk_t xvd;
memset (&xvd, 0, sizeof(xvd));
if (copy_from_user(local, buffer, count))
{
return -EFAULT;
}
local[count] = '\0';
string = get_string(local); /* domain specifier */
if (string == NULL)
{
return count;
}
if (*string != 'd' && *string != 'D')
{
printk (KERN_ALERT
"error: domain specifier missing [%s]. should be \"domain\".\n",
string);
return count;
}
string = get_string(NULL); /* domain number */
if (string == NULL)
{
printk (KERN_ALERT "error: domain number missing\n");
return count;
}
xvd.domain = (int) to_number(string);
string = get_string(NULL);
if (string && (strcmp(string, "RO") == 0 || strcmp(string, "ro") == 0))
{
xvd.mode = XEN_DISK_READ_ONLY;
}
else if (string && (strcmp(string, "RW") == 0 || strcmp(string, "rw") == 0))
{
xvd.mode = XEN_DISK_READ_WRITE;
}
else
{
printk (KERN_ALERT
"error: bad mode [%s]. should be \"rw\" or \"ro\".\n",
string);
return count;
}
string = get_string(NULL); /* look for Segment */
if (string == NULL || (*string != 's' && *string != 'S'))
{
printk (KERN_ALERT
"error: segment specifier missing [%s]. should be \"segment\".\n",
string);
return count;
}
string = get_string(NULL); /* segment number */
if (string == NULL)
{
printk (KERN_ALERT "error: segment number missing\n");
return count;
}
xvd.segment = (int) to_number(string);
string = get_string(NULL); /* look for Extents */
if (string == NULL || (*string != 'e' && *string != 'E'))
{
printk (KERN_ALERT
"error: extents specifier missing [%s]. should be \"extents\".\n",
string);
return count;
}
string = get_string(NULL); /* number of extents */
if (string == NULL)
{
printk (KERN_ALERT "error: number of extents missing\n");
return count;
}
xvd.ext_count = (int) to_number(string);
/* ignore parenthesis */
for (loop = 0; loop < xvd.ext_count; loop++)
{
string = get_string(NULL); /* look for Disk */
if (string == NULL || (*string != 'd' && *string != 'D'))
{
printk (KERN_ALERT
"hmm, extent disk specifier missing [%s]. should be \"disk\".\n",
string);
return count;
}
string = get_string(NULL); /* disk number */
if (string == NULL)
{
printk (KERN_ALERT "error: disk number missing\n");
return count;
}
xvd.extents[loop].disk = xldev_to_physdev((int) to_number(string));
string = get_string(NULL); /* look for Offset */
if (string == NULL || (*string != 'o' && *string != 'O'))
{
printk (KERN_ALERT
"error: disk offset missing [%s]. should be \"offset\".\n",
string);
return count;
}
string = get_string(NULL); /* offset */
if (string == NULL)
{
printk (KERN_ALERT "error: offset missing\n");
return count;
}
xvd.extents[loop].offset = to_number(string);
string = get_string(NULL); /* look for Size */
if (string == NULL || (*string != 's' && *string != 'S'))
{
printk (KERN_ALERT
"error: extent size missing [%s]. should be \"size\".\n",
string);
return count;
}
string = get_string(NULL); /* size */
if (string == NULL)
{
printk (KERN_ALERT "error: extent size missing\n");
return count;
}
xvd.extents[loop].size = to_number(string);
}
xenolinux_control_msg(XEN_BLOCK_SEG_CREATE, (char *)&xvd, sizeof(xvd));
return count;
}
/******************************************************************/
int __init xlseg_proc_init(void)
{
vhd = create_proc_entry("xeno/dom0/vhd", 0644, NULL);
if (vhd == NULL)
{
panic ("xlseg_init: unable to create vhd proc entry\n");
}
vhd->data = NULL;
vhd->read_proc = proc_read_vhd;
vhd->write_proc = proc_write_vhd;
vhd->owner = THIS_MODULE;
printk(KERN_ALERT "XenoLinux Virtual Disk Device Monitor installed\n");
return 0;
}
static void __exit xlseg_proc_cleanup(void)
{
printk(KERN_ALERT "XenoLinux Virtual Disk Device Monitor uninstalled\n");
}
#ifdef MODULE
module_init(xlseg_proc_init);
module_exit(xlseg_proc_cleanup);
#endif
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