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Old 05-07-2012, 06:06 AM   #1
linux_ques
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Registered: May 2012
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Trap block level read and write request for disk


hi,

I want to develop a kernel module that can trap all the read/write requests coming for the disk.
How can i trap the read/write command issued by filesystem driver
to disk driver.
any pointers/suggestions.

thanks for help.
 
Old 05-17-2012, 12:34 AM   #2
linux_ques
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Registered: May 2012
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Trap block level read and write request for disk

I have found this driver on sourceforge.org

static int __init init_module( void )
{
//----------//
dev[0] = (dev_t)open_by_devnum (MKDEV(HOST_DISK_MAJOR_NUM,HOST_DISK_MINOR_NUM), FMODE_READ|FMODE_WRITE); // It is trying to open the Host disk
blk_queue_make_request (Queue, make_request);
blk_queue_hardsect_size(Queue, hardsect_size);
//register the function for I/O request handling
//-------------------
}

But when i perform I/O's on the disk it doesnt show me read and write request funtion being called.

Is there any way to access the I/O request queue for hard disk.

Please verify my understanding or provide some pointer to sample code doing the same.

thanks in advance
 
Old 05-17-2012, 12:44 AM   #3
chrism01
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Have you considered systemtap http://www.linuxtopia.org/online_boo...stemtap_guide/
 
  


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