A doubt regarding submit_bio()

Durga Prasad writexdp at yahoo.com
Wed Dec 29 02:20:58 EST 2010

This works asynchronously. 
So you should __not__ expect the same ordering in execution of bio->bi_endio ()

From: Gaurav Mahajan <gauravmahajan2007 at gmail.com>
To: kernelnewbies <kernelnewbies at nl.linux.org>
Sent: Tue, December 28, 2010 12:55:12 AM
Subject: A doubt regarding submit_bio()

Hello all,

I am working on a operation in which I need to assure the order of
bio_end_io() functions.
Consider the scenario,

If I submit two bio requests using submit_bio() function one after
another, then is there any guarantee that the bio_end_io() for the
bios will be invoked in the same order in which I submitted the bios?

Basically I mean to say, would the generic block layer or I/O
scheduler maintain the order of bios submitted to them?

Hoping for some help.


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