[linux-lvm] Re: raid 1 on a single disk
ashwin chaugule
ashwin.chaugule at gmail.com
Sun Nov 14 19:02:53 UTC 2004
>Because your code, like your description, is an uncontrolled mess,
>probably.
WHAT !!!!!
>Registers? What registers? Do you mean "fields"?
yes i mean fields, my bad.
>This sounds like stuff you do in the driver , on receipt of your special
>request. Is that so and how do you recognize it
by checking the MAJOR and MINOR num of my disk !!!!! ?
>Default interrupt handler?
remember i said , i set a different intr. handler if its my disk !?
well, after its handled there, i dont call end_request , simple.
eg.
mult_write is the default intr. handler for multiple writes ?
i set mult_write_withoutend as the handler, then after the handling is
done , i again set
mult_write as the handler.... this will call the end_request.
>or whether you only have one request hit the
>driver and when it hits you simply treat it twice
bingo !
>Probably because some stuff is returned to kernel pools and messes them
>up completely.
what stuff ? im not returning anything to any queue whatsoever !
>Because your code, like your description, is an uncontrolled mess,
>probably.
about the code .. umm , maybe not , coz the write is duplicated alright ..
my description , a mess ?... nope , what im doing is really simple ,
as i stated in the very first mail , im doing something similar to
RAID 1 !! , what s so hard to understand in that ?
I also said , why im continuing with the IDE modifications inspite of
the RAID 1 drivers.
--snipped--
However, in my driver (modified IDE) I have to take care of the writes
and reads individualy.
The advantage here is that, i dont need to make 4 partitions of the
disk, one is good enough, and the remaining can be unallocated. I make
the write at fixed offsets into the unallocated space, and when read
is requested, I read em one by one, and check.
--snipped--
So now ( after im done with the read requests ) i have two options for them...
RAID 1 and the modified the IDE driver.
Ashwin
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