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Hi, I am writing a block virtual driver on the lines of Linux
Device Drivers book 3rd Edition.which is the sbull one. What I have
done in my code is my open function call implementation has just a printk
statement. I have done the initializiation of the request queue as well by
calling blk_init_queue() function. At the end I have added add_disk() in the
init function. However I get the following error :- Buffer I/O on logical block 0 . Unable to
read the partition table etc. However if I comment the
add_disk it doesn’t throw me an error. According to the book, I
understand that the disk is live , which means even before add_disk() function
returns , the kernel tries to read the partition table and also there could be
requests taking place. So how can I get rid of this problem. I create a mknod by
hand from the command-line mknod –m 666 /dev/<name> b <major>
<minor>. The major number I get from register_blkdev and the minor
no. I give from the first_minor which is in struct gendisk , which I have set
it to 0. I test this using dd if=/dev/<name> of=/dev/null bs=512
count=1. It gives me the same error. Can you please help me out. It’s urgent. http://www.patni.com World-Wide Partnerships. World-Class Solutions. _____________________________________________________________________ This e-mail message may contain proprietary, confidential or legally privileged information for the sole use of the person or entity to whom this message was originally addressed. Any review, e-transmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this e-mail in error kindly delete this e-mail from your records. If it appears that this mail has been forwarded to you without proper authority, please notify us immediately at netadmin@xxxxxxxxx and delete this mail. _____________________________________________________________________ |
