Hello,everyone, I have some questions about Linux file
system and block device.
First, you know for the block device there is a
blk_dev table which is indexed by the major number of
the block device. The register_blkdev() function is
used to insert a new entry into this blk_dev table.
How can I access to this table in my kernel module?
The reason why I want to access to this table is I
want to access some specific Block Device Driver
Descriptor so that I can access to the request queue
of that block device, such as floppy disk device. This
table is a global variable?
Second, whether two kernel modules can communicate
with each other or not? For example, can my own kernel
module communicate with the floppy block device? And
how? I want to intercept the read/write operations to
the floppy block device. I mean I want to hook all the
read/write operations to the floppy block device in my
Third, I know that the kernel statically allocates a
fixed number of request descriptors to handle all the
requests for block devices. There are NR_REQUEST
descriptors (usually 128) stored in the all_requests
array (This is from the book "Understanding the Linux
Kernel" by Daniel P. Bovet&Marco Cesati. P403). How
can I access this all_requests array? I need to access
the request descriptor of the floppy disk device.
Last one, about the ll_rw_block() function. How can I
intercept this function in my kernel module? Can I get
the function pointer of this function in my module?
Any idea will be appreciated.
Send your holiday cheer with http://greetings.yahoo.ca
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to email@example.com
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:25 EST