Dear Linux Kernel Govers,
I have read through the LDD3 & LWN and got a fair understanding about
implementing Linux removable block driver. I made an attempt to
simulate the Removable media in a Simple block driver module.
I am doing the following when trying to simulate the Removable media:
/******* Simple block Driver request ********/
static void sbd_request(request_queue_t *q)
{
struct request *req;
int status;
while ((req = elv_next_request(q)) != NULL) {
if (! blk_fs_request(req)) {
printk (KERN_NOTICE "Skip non-CMD request\n");
end_request(req, 0);
continue;
}
/* Simple memcpy based on the request ; Returns success or
failure which is passed to end_that_request_first() */
status = sbd_transfer(&Device, req->sector, req->current_nr_sectors,
req->buffer, rq_data_dir(req));
if(!end_that_request_first(req, status, req->current_nr_sectors)) {
blkdev_dequeue_request(req);
end_that_request_last(req);
}
}
Then, I prepared an IOCTL to simulate the removable media to the kernel.
When the applications issues IOCTL, it performs the following to
notify the kernel of removed disk.
/* Simulate the Removal Media Disk */
Case REMOVE_MOUNTED_DISK:
if(Device.bdev)
invalidate_bdev(Device.bdev,1);
del_gendisk(Device.gd);
put_disk(Device.gd);
blk_cleanup_queue(Queue);
vfree(Device.data);
return 0;
when I issue #ls /mnt (mount point) ( i.e. after the application
issues the IOCTL)
the Kernel crashes,
OR
it crashes when tried to unload the module.
I have been trying hard to understand the real problem with this
module a long time from now.
What wrong am I doing in this module?
I will provide you with source code if you need it any time.
Please let me know what additional things should I handle when writing
code for removable media?
Regards,
Mukund Jampala
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