blob: 197071de0b7f4a5090827ceab36ea258fe71215f [file] [log] [blame]
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
/* 2001-09-28...2002-04-17
* Partition stuff by James_McMechan@hotmail.com
* old style ubd by setting UBD_SHIFT to 0
*/
#define MAJOR_NR UBD_MAJOR
#define UBD_SHIFT 4
#include "linux/config.h"
#include "linux/blk.h"
#include "linux/blkdev.h"
#include "linux/hdreg.h"
#include "linux/init.h"
#include "linux/devfs_fs_kernel.h"
#include "linux/cdrom.h"
#include "linux/proc_fs.h"
#include "linux/ctype.h"
#include "linux/capability.h"
#include "linux/mm.h"
#include "linux/vmalloc.h"
#include "linux/blkpg.h"
#include "linux/genhd.h"
#include "asm/segment.h"
#include "asm/uaccess.h"
#include "asm/irq.h"
#include "asm/types.h"
#include "user_util.h"
#include "mem_user.h"
#include "kern_util.h"
#include "kern.h"
#include "mconsole_kern.h"
#include "init.h"
#include "irq_user.h"
#include "ubd_user.h"
#include "2_5compat.h"
#include "os.h"
static int ubd_open(struct inode * inode, struct file * filp);
static int ubd_release(struct inode * inode, struct file * file);
static int ubd_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg);
static int ubd_revalidate(kdev_t rdev);
#define MAX_DEV (8)
#define MAX_MINOR (MAX_DEV << UBD_SHIFT)
/* block size in bytes */
static int blk_sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = BLOCK_SIZE };
/* number of bytes per sector */
static int hardsect_sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = 512 };
/* device size in KB */
static int sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = 0 };
static struct block_device_operations ubd_blops = {
open: ubd_open,
release: ubd_release,
ioctl: ubd_ioctl,
revalidate: ubd_revalidate,
};
static struct hd_struct ubd_part[MAX_MINOR] =
{ [ 0 ... MAX_MINOR - 1 ] = { 0, 0, 0 } };
static request_queue_t *ubd_queue;
static int fake_major = 0;
#define INIT_GENDISK(maj, name, parts, shift, bsizes, max, blops) \
{ \
major : maj, \
major_name : name, \
minor_shift : shift, \
max_p : 1 << shift, \
part : parts, \
sizes : bsizes, \
nr_real : max, \
real_devices : NULL, \
next : NULL, \
fops : blops, \
de_arr : NULL, \
flags : 0 \
}
static struct gendisk ubd_gendisk = INIT_GENDISK(MAJOR_NR, "ubd", ubd_part,
UBD_SHIFT, sizes, MAX_DEV,
&ubd_blops);
static struct gendisk fake_gendisk = INIT_GENDISK(0, "ubd", ubd_part,
UBD_SHIFT, sizes, MAX_DEV,
&ubd_blops);
#ifdef CONFIG_BLK_DEV_UBD_SYNC
#define OPEN_FLAGS ((struct openflags) { r : 1, w : 1, s : 1, c : 0 })
#else
#define OPEN_FLAGS ((struct openflags) { r : 1, w : 1, s : 0, c : 0 })
#endif
static struct openflags global_openflags = OPEN_FLAGS;
struct cow {
char *file;
int fd;
unsigned long *bitmap;
unsigned long bitmap_len;
int bitmap_offset;
int data_offset;
};
struct ubd {
char *file;
int is_dir;
int count;
int fd;
__u64 size;
struct openflags boot_openflags;
struct openflags openflags;
devfs_handle_t real;
devfs_handle_t fake;
struct cow cow;
};
#define DEFAULT_COW { \
file: NULL, \
fd: -1, \
bitmap: NULL, \
bitmap_offset: 0, \
data_offset: 0, \
}
#define DEFAULT_UBD { \
file: NULL, \
is_dir: 0, \
count: 0, \
fd: -1, \
size: -1, \
boot_openflags: OPEN_FLAGS, \
openflags: OPEN_FLAGS, \
real: NULL, \
fake: NULL, \
cow: DEFAULT_COW, \
}
struct ubd ubd_dev[MAX_DEV] = {
{
file: "root_fs",
is_dir: 0,
count: 0,
fd: -1,
size: 0,
boot_openflags: OPEN_FLAGS,
openflags: OPEN_FLAGS,
real: NULL,
fake: NULL,
cow: DEFAULT_COW,
},
[ 1 ... MAX_DEV - 1 ] = DEFAULT_UBD
};
static struct hd_driveid ubd_id = {
cyls: 0,
heads: 128,
sectors: 32,
};
static int fake_ide = 0;
static struct proc_dir_entry *proc_ide_root = NULL;
static struct proc_dir_entry *proc_ide = NULL;
static void make_proc_ide(void)
{
proc_ide_root = proc_mkdir("ide", 0);
proc_ide = proc_mkdir("ide0", proc_ide_root);
}
static int proc_ide_read_media(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int len;
strcpy(page, "disk\n");
len = strlen("disk\n");
len -= off;
if (len < count){
*eof = 1;
if (len <= 0) return 0;
}
else len = count;
*start = page + off;
return len;
}
static void make_ide_entries(char *dev_name)
{
struct proc_dir_entry *dir, *ent;
char name[64];
if(!fake_ide) return;
if(proc_ide_root == NULL) make_proc_ide();
dir = proc_mkdir(dev_name, proc_ide);
ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir);
if(!ent) return;
ent->nlink = 1;
ent->data = NULL;
ent->read_proc = proc_ide_read_media;
ent->write_proc = NULL;
sprintf(name,"ide0/%s", dev_name);
proc_symlink(dev_name, proc_ide_root, name);
}
static int fake_ide_setup(char *str)
{
fake_ide = 1;
return(1);
}
__setup("fake_ide", fake_ide_setup);
__uml_help(fake_ide_setup,
"fake_ide\n"
" Create ide0 entries that map onto ubd devices.\n\n"
);
static int ubd_setup_common(char *str, int *index_out)
{
struct openflags flags = global_openflags;
char *backing_file;
int n;
if(index_out) *index_out = -1;
n = *str++;
if(n == '='){
char *end;
int major;
if(!strcmp(str, "sync")){
global_openflags.s = 1;
return(0);
}
major = simple_strtoul(str, &end, 0);
if(*end != '\0'){
printk(KERN_ERR
"ubd_setup : didn't parse major number\n");
return(1);
}
fake_gendisk.major = major;
fake_major = major;
printk(KERN_INFO "Setting extra ubd major number to %d\n",
major);
return(0);
}
if(n < '0'){
printk(KERN_ERR "ubd_setup : index out of range\n"); }
if((n >= '0') && (n <= '9')) n -= '0';
else if((n >= 'a') && (n <= 'z')) n -= 'a';
else {
printk(KERN_ERR "ubd_setup : device syntax invalid\n");
return(1);
}
if(n >= MAX_DEV){
printk(KERN_ERR "ubd_setup : index out of range "
"(%d devices)\n", MAX_DEV);
return(1);
}
if(index_out) *index_out = n;
if (*str == 'r'){
flags.w = 0;
str++;
}
if (*str == 's'){
flags.s = 1;
str++;
}
if(*str++ != '='){
printk(KERN_ERR "ubd_setup : Expected '='\n");
return(1);
}
backing_file = strchr(str, ',');
if(backing_file){
*backing_file = '\0';
backing_file++;
}
ubd_dev[n].file = str;
ubd_dev[n].cow.file = backing_file;
ubd_dev[n].boot_openflags = flags;
return(0);
}
static int ubd_setup(char *str)
{
ubd_setup_common(str, NULL);
return(1);
}
__setup("ubd", ubd_setup);
__uml_help(ubd_setup,
"ubd<n>=<filename>\n"
" This is used to associate a device with a file in the underlying\n"
" filesystem. Usually, there is a filesystem in the file, but \n"
" that's not required. Swap devices containing swap files can be\n"
" specified like this. Also, a file which doesn't contain a\n"
" filesystem can have its contents read in the virtual \n"
" machine by running dd on the device. n must be in the range\n"
" 0 to 7. Appending an 'r' to the number will cause that device\n"
" to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
" an 's' (has to be _after_ 'r', if there is one) will cause data\n"
" to be written to disk on the host immediately.\n\n"
);
static int fakehd(char *str)
{
printk(KERN_INFO
"fakehd : Changing ubd_gendisk.major_name to \"hd\".\n");
ubd_gendisk.major_name = "hd";
return(1);
}
__setup("fakehd", fakehd);
__uml_help(fakehd,
"fakehd\n"
" Change the ubd device name to \"hd\".\n\n"
);
static void do_ubd_request(request_queue_t * q);
int thread_fd = -1;
int intr_count = 0;
static void ubd_finish(int error)
{
int nsect;
if(error){
end_request(0);
return;
}
nsect = CURRENT->current_nr_sectors;
CURRENT->sector += nsect;
CURRENT->buffer += nsect << 9;
CURRENT->errors = 0;
CURRENT->nr_sectors -= nsect;
CURRENT->current_nr_sectors = 0;
end_request(1);
}
static void ubd_handler(void)
{
struct io_thread_req req;
int n;
DEVICE_INTR = NULL;
intr_count++;
n = read_ubd_fs(thread_fd, &req, sizeof(req));
if(n != sizeof(req)){
printk(KERN_ERR "Pid %d - spurious interrupt in ubd_handler, "
"errno = %d\n", os_getpid(), -n);
spin_lock(&REQUEST_LOCK);
end_request(0);
spin_unlock(&REQUEST_LOCK);
return;
}
if((req.offset != ((__u64) (CURRENT->sector)) << 9) ||
(req.length != (CURRENT->current_nr_sectors) << 9))
panic("I/O op mismatch");
spin_lock(&REQUEST_LOCK);
ubd_finish(req.error);
reactivate_fd(thread_fd, UBD_IRQ);
do_ubd_request(ubd_queue);
spin_unlock(&REQUEST_LOCK);
}
static void ubd_intr(int irq, void *dev, struct pt_regs *unused)
{
ubd_handler();
}
static int io_pid = -1;
void kill_io_thread(void)
{
if(io_pid != -1) kill(io_pid, SIGKILL);
}
__uml_exitcall(kill_io_thread);
int sync = 0;
devfs_handle_t ubd_dir_handle;
devfs_handle_t ubd_fake_dir_handle;
static int ubd_add(int n)
{
char name[sizeof("nnnnnn\0")], dev_name[sizeof("ubd0x")];
if(ubd_dev[n].file == NULL) return(-1);
sprintf(name, "%d", n);
ubd_dev[n].real = devfs_register(ubd_dir_handle, name,
DEVFS_FL_REMOVABLE, MAJOR_NR,
n << UBD_SHIFT,
S_IFBLK | S_IRUSR | S_IWUSR |
S_IRGRP |S_IWGRP,
&ubd_blops, NULL);
if(fake_major != 0){
ubd_dev[n].fake = devfs_register(ubd_fake_dir_handle, name,
DEVFS_FL_REMOVABLE,
fake_major, n << UBD_SHIFT,
S_IFBLK | S_IRUSR |
S_IWUSR | S_IRGRP | S_IWGRP,
&ubd_blops, NULL);
}
if(!strcmp(ubd_gendisk.major_name, "ubd")){
sprintf(dev_name, "%s%d", ubd_gendisk.major_name, n);
}
else sprintf(dev_name, "%s%c", ubd_gendisk.major_name,
n + 'a');
make_ide_entries(dev_name);
ubd_revalidate(MKDEV(MAJOR_NR, n << UBD_SHIFT));
return(0);
}
static int ubd_config(char *str)
{
int n, err;
str = uml_strdup(str);
if(str == NULL){
printk(KERN_ERR "ubd_config failed to strdup string\n");
return(1);
}
err = ubd_setup_common(str, &n);
if(err){
kfree(str);
return(-1);
}
if(n != -1) ubd_add(n);
return(0);
}
static int ubd_remove(char *str)
{
struct ubd *dev;
int n;
if(!isdigit(*str)) return(-1);
n = *str - '0';
if(n > MAX_DEV) return(-1);
dev = &ubd_dev[n];
if(dev->file == NULL) return(0);
if(dev->count > 0) return(-1);
if(dev->real != NULL) devfs_unregister(dev->real);
if(dev->fake != NULL) devfs_unregister(dev->fake);
*dev = ((struct ubd) DEFAULT_UBD);
return(0);
}
static struct mc_device ubd_mc = {
name: "ubd",
config: ubd_config,
remove: ubd_remove,
};
int ubd_mc_init(void)
{
mconsole_register_dev(&ubd_mc);
return(0);
}
__initcall(ubd_mc_init);
static request_queue_t *ubd_get_queue(kdev_t device)
{
return(ubd_queue);
}
int ubd_init(void)
{
unsigned long stack;
int i, err;
ubd_dir_handle = devfs_mk_dir (NULL, "ubd", NULL);
if (devfs_register_blkdev(MAJOR_NR, "ubd", &ubd_blops)) {
printk(KERN_ERR "ubd: unable to get major %d\n", MAJOR_NR);
return -1;
}
ubd_queue = BLK_DEFAULT_QUEUE(MAJOR_NR);
INIT_QUEUE(ubd_queue, DEVICE_REQUEST, &ubd_lock);
INIT_ELV(ubd_queue, &ubd_queue->elevator);
read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
blksize_size[MAJOR_NR] = blk_sizes;
blk_size[MAJOR_NR] = sizes;
INIT_HARDSECT(hardsect_size, MAJOR_NR, hardsect_sizes);
add_gendisk(&ubd_gendisk);
if (fake_major != 0){
char name[sizeof("ubd_nnn\0")];
snprintf(name, sizeof(name), "ubd_%d", fake_major);
ubd_fake_dir_handle = devfs_mk_dir(NULL, name, NULL);
if(devfs_register_blkdev(fake_major, "ubd", &ubd_blops)) {
printk(KERN_ERR "ubd: unable to get major %d\n",
fake_major);
return -1;
}
blk_dev[fake_major].queue = ubd_get_queue;
read_ahead[fake_major] = 8; /* 8 sector (4kB) read-ahead */
blksize_size[fake_major] = blk_sizes;
blk_size[fake_major] = sizes;
INIT_HARDSECT(hardsect_size, fake_major, hardsect_sizes);
add_gendisk(&fake_gendisk);
}
for(i=0;i<MAX_DEV;i++) ubd_add(i);
if(sync){
printk(KERN_INFO "ubd : Synchronous mode\n");
return(0);
}
stack = alloc_stack(0);
io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *),
&thread_fd);
if(io_pid < 0){
printk(KERN_ERR
"ubd : Failed to start I/O thread (errno = %d) - "
"falling back to synchronous I/O\n", -io_pid);
return(0);
}
err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
SA_INTERRUPT, "ubd", ubd_dev);
if(err != 0) printk(KERN_ERR
"um_request_irq failed - errno = %d\n", -err);
return(err);
}
__initcall(ubd_init);
static void ubd_close(struct ubd *dev)
{
close_fd(dev->fd);
if(dev->cow.file != NULL) {
close_fd(dev->cow.fd);
vfree(dev->cow.bitmap);
dev->cow.bitmap = NULL;
}
}
static int ubd_open_dev(struct ubd *dev)
{
struct openflags flags;
int err, n, create_cow, *create_ptr;
create_cow = 0;
create_ptr = (dev->cow.file != NULL) ? &create_cow : NULL;
dev->fd = open_ubd_file(dev->file, &dev->openflags, &dev->cow.file,
&dev->cow.bitmap_offset, &dev->cow.bitmap_len,
&dev->cow.data_offset, create_ptr);
if((dev->fd == -ENOENT) && create_cow){
n = dev - ubd_dev;
dev->fd = create_cow_file(dev->file, dev->cow.file,
dev->openflags, 1 << 9,
&dev->cow.bitmap_offset,
&dev->cow.bitmap_len,
&dev->cow.data_offset);
if(dev->fd >= 0){
printk(KERN_INFO "Creating \"%s\" as COW file for "
"\"%s\"\n", dev->file, dev->cow.file);
}
}
if(dev->fd < 0) return(dev->fd);
if(dev->cow.file != NULL){
err = -ENOMEM;
dev->cow.bitmap = (void *) vmalloc(dev->cow.bitmap_len);
if(dev->cow.bitmap == NULL) goto error;
flush_tlb_kernel_vm();
err = read_cow_bitmap(dev->fd, dev->cow.bitmap,
dev->cow.bitmap_offset,
dev->cow.bitmap_len);
if(err) goto error;
flags = dev->openflags;
flags.w = 0;
err = open_ubd_file(dev->cow.file, &flags, NULL, NULL, NULL,
NULL, NULL);
if(err < 0) goto error;
dev->cow.fd = err;
}
return(0);
error:
close_fd(dev->fd);
return(err);
}
static int ubd_file_size(struct ubd *dev, __u64 *size_out)
{
char *file;
file = dev->cow.file ? dev->cow.file : dev->file;
return(os_file_size(file, size_out));
}
static int ubd_open(struct inode *inode, struct file *filp)
{
struct ubd *dev;
int n, offset, err;
n = DEVICE_NR(inode->i_rdev);
dev = &ubd_dev[n];
if(n > MAX_DEV)
return -ENODEV;
offset = n << UBD_SHIFT;
if(ubd_is_dir(dev->file)){
dev->is_dir = 1;
return(0);
}
if(dev->count == 0){
dev->openflags = dev->boot_openflags;
/* XXX This error is wrong when errno isn't stored in
* dev->fd
*/
if(ubd_open_dev(dev) < 0){
printk(KERN_ERR "ubd%d: Can't open \"%s\": "
"errno = %d\n", n, dev->file, -dev->fd);
}
if(dev->fd < 0)
return -ENODEV;
err = ubd_file_size(dev, &dev->size);
if(err) return(err);
sizes[offset] = dev->size / BLOCK_SIZE;
ubd_part[offset].nr_sects = dev->size / hardsect_sizes[offset];
}
dev->count++;
if((filp->f_mode & FMODE_WRITE) && !dev->openflags.w){
if(--dev->count == 0) ubd_close(dev);
return -EROFS;
}
return(0);
}
static int ubd_release(struct inode * inode, struct file * file)
{
int n, offset;
n = DEVICE_NR(inode->i_rdev);
offset = n << UBD_SHIFT;
if(n > MAX_DEV)
return -ENODEV;
if(--ubd_dev[n].count == 0){
ubd_close(&ubd_dev[n]);
sizes[offset] = 0;
ubd_part[offset].nr_sects = 0;
}
return(0);
}
int cow_read = 0;
int cow_write = 0;
void cowify_req(struct io_thread_req *req, struct ubd *dev)
{
int i, update_bitmap, sector = req->offset >> 9;
if(req->length > (sizeof(req->sector_mask) * 8) << 9)
panic("Operation too long");
if(req->op == UBD_READ) {
for(i = 0; i < req->length >> 9; i++){
if(ubd_test_bit(sector + i, (unsigned char *)
dev->cow.bitmap)){
ubd_set_bit(i, (unsigned char *)
&req->sector_mask);
cow_read++;
}
}
}
else {
update_bitmap = 0;
for(i = 0; i < req->length >> 9; i++){
cow_write++;
ubd_set_bit(i, (unsigned char *)
&req->sector_mask);
if(!ubd_test_bit(sector + i, (unsigned char *)
dev->cow.bitmap))
update_bitmap = 1;
ubd_set_bit(sector + i, (unsigned char *)
dev->cow.bitmap);
}
if(update_bitmap){
req->cow_offset = sector / (sizeof(unsigned long) * 8);
req->bitmap_words[0] =
dev->cow.bitmap[req->cow_offset];
req->bitmap_words[1] =
dev->cow.bitmap[req->cow_offset + 1];
req->cow_offset *= sizeof(unsigned long);
req->cow_offset += dev->cow.bitmap_offset;
}
}
}
static int prepare_request(struct request *req, struct io_thread_req *io_req)
{
struct ubd *dev;
__u64 block;
int nsect, minor, n;
if(req->rq_status == RQ_INACTIVE) return(1);
minor = MINOR(req->rq_dev);
n = minor >> UBD_SHIFT;
dev = &ubd_dev[n];
if(dev->is_dir){
strcpy(req->buffer, "HOSTFS:");
strcat(req->buffer, dev->file);
end_request(1);
return(1);
}
if(IS_WRITE(req) && !dev->openflags.w){
printk("Write attempted on readonly ubd device %d\n", n);
end_request(0);
return(1);
}
req->sector += ubd_part[minor].start_sect;
block = req->sector;
nsect = req->current_nr_sectors;
io_req->op = (req->cmd == READ) ? UBD_READ : UBD_WRITE;
io_req->fds[0] = (dev->cow.file != NULL) ? dev->cow.fd : dev->fd;
io_req->fds[1] = dev->fd;
io_req->offsets[0] = 0;
io_req->offsets[1] = dev->cow.data_offset;
io_req->offset = ((__u64) block) << 9;
io_req->length = nsect << 9;
io_req->buffer = req->buffer;
io_req->sectorsize = 1 << 9;
io_req->sector_mask = 0;
io_req->cow_offset = -1;
io_req->error = 0;
if(dev->cow.file != NULL) cowify_req(io_req, dev);
return(0);
}
static void do_ubd_request(request_queue_t *q)
{
struct io_thread_req io_req;
struct request *req;
int err, n;
if(thread_fd == -1){
while(!list_empty(&q->queue_head)){
req = blkdev_entry_next_request(&q->queue_head);
err = prepare_request(req, &io_req);
if(!err){
do_io(&io_req);
ubd_finish(io_req.error);
}
}
}
else {
if(DEVICE_INTR || list_empty(&q->queue_head)) return;
req = blkdev_entry_next_request(&q->queue_head);
err = prepare_request(req, &io_req);
if(!err){
SET_INTR(ubd_handler);
n = write_ubd_fs(thread_fd, (char *) &io_req,
sizeof(io_req));
if(n != sizeof(io_req))
printk("write to io thread failed, "
"errno = %d\n", -n);
}
}
}
static int ubd_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct hd_geometry *loc = (struct hd_geometry *) arg;
struct ubd *dev;
int n, minor, err;
if(!inode) return(-EINVAL);
minor = MINOR(inode->i_rdev);
n = minor >> UBD_SHIFT;
if(n > MAX_DEV)
return(-EINVAL);
dev = &ubd_dev[n];
switch (cmd) {
struct hd_geometry g;
struct cdrom_volctrl volume;
case HDIO_GETGEO:
if(!loc) return(-EINVAL);
g.heads = 128;
g.sectors = 32;
g.cylinders = dev->size / (128 * 32 * hardsect_sizes[minor]);
g.start = 2;
return(copy_to_user(loc, &g, sizeof(g)) ? -EFAULT : 0);
case BLKGETSIZE: /* Return device size */
if(!arg) return(-EINVAL);
err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
if(err)
return(err);
put_user(ubd_part[minor].nr_sects, (long *) arg);
return(0);
case BLKRRPART: /* Re-read partition tables */
return(ubd_revalidate(inode->i_rdev));
case HDIO_SET_UNMASKINTR:
if(!capable(CAP_SYS_ADMIN)) return(-EACCES);
if((arg > 1) || (minor & 0x3F)) return(-EINVAL);
return(0);
case HDIO_GET_UNMASKINTR:
if(!arg) return(-EINVAL);
err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
if(err)
return(err);
return(0);
case HDIO_GET_MULTCOUNT:
if(!arg) return(-EINVAL);
err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
if(err)
return(err);
return(0);
case HDIO_SET_MULTCOUNT:
if(!capable(CAP_SYS_ADMIN)) return(-EACCES);
if(MINOR(inode->i_rdev) & 0x3F) return(-EINVAL);
return(0);
case HDIO_GET_IDENTITY:
ubd_id.cyls = dev->size / (128 * 32 * hardsect_sizes[minor]);
if(copy_to_user((char *) arg, (char *) &ubd_id,
sizeof(ubd_id)))
return(-EFAULT);
return(0);
case CDROMVOLREAD:
if(copy_from_user(&volume, (char *) arg, sizeof(volume)))
return(-EFAULT);
volume.channel0 = 255;
volume.channel1 = 255;
volume.channel2 = 255;
volume.channel3 = 255;
if(copy_to_user((char *) arg, &volume, sizeof(volume)))
return(-EFAULT);
return(0);
default:
return blk_ioctl(inode->i_rdev, cmd, arg);
}
}
static int ubd_revalidate(kdev_t rdev)
{
int i, n, offset, err, pcount = 1 << UBD_SHIFT;
struct ubd *dev;
struct hd_struct *part;
n = DEVICE_NR(rdev);
offset = n << UBD_SHIFT;
dev = &ubd_dev[n];
part = &ubd_part[offset];
/* clear all old partition counts */
for(i = 1; i < pcount; i++) {
part[i].start_sect = 0;
part[i].nr_sects = 0;
}
/* If it already has been opened we can check the partitions
* directly
*/
if(dev->count){
part->start_sect = 0;
register_disk(&ubd_gendisk, MKDEV(MAJOR_NR, offset), pcount,
&ubd_blops, part->nr_sects);
}
else if(dev->file){
if(ubd_open_dev(dev) < 0){
printk(KERN_ERR "unable to open %s for validation\n",
dev->file);
return 1;
}
/* have to recompute sizes since we opened it */
err = ubd_file_size(dev, &dev->size);
if(err) {
ubd_close(dev);
return 1;
}
part->start_sect = 0;
part->nr_sects = dev->size / hardsect_sizes[offset];
register_disk(&ubd_gendisk, MKDEV(MAJOR_NR, offset), pcount,
&ubd_blops, part->nr_sects);
/* we are done so close it */
ubd_close(dev);
}
else return(1);
return(0);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/