O_NONBLOCK with Ext3

From: Yedire, Sandeep
Date: Wed Jun 09 2010 - 07:30:56 EST

I am currently using o_nonblock flag for writing a file of 64MB over a
flash device. Flash is formatted with ext3 filesystem with default
When instrumented the driver code for collecting the erase/write count
at sector level. I noticed that o_nonblock has no effect on this
count. There is no difference in erase/write count with o_nonblock
flag or without this flag.
When selected Ext2 as filesystem I noticed a significant difference in
the erase/write count.
There were more updates with o_nonblock and test application was
faster. I could confirm this by checking the Dirty page limit in the
background. It was updating faster in case of Ext2 not incase of Ext3.

Can any one explain on o_nonblock flag in case of Ext3 filesystem?


T.Jefferson, 'Victory and defeat are each of the same price"
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