bio_endio error codes

[Alvin Abitria]

Hello Gurus,

Please disregard my earlier mail due to poor formatting 
and readability.

I'm developing a block driver using the make_request 
method, effectively bypassing existing scsi or request 
stack in block layer.  So that means im directly 
working with bios.  As prescribed in linux 
documentation and from referring to similar 
drivers in kernel, you close a session with a 
bio with the bio_endio function.

I usually invoke bio_endio during successful 
I/O completion, meaning with an error code 
of zero.  But there are cases that this is not 
fulfilled or there are error cases.  My question
 is, what are the valid error codes that can be 
used with it?  My initial impression is that 
other than zero as error code, bio_endio will 
fail.  I've read somewhere that -EBUSY is not 
recognized, and I tried -EIO but my driver 
crashed.  I got a panic in some dio_xxx function 
leading from bio_endio(bio,-EIO). I would 
like to block subsequent bios sent to me after 
reaching my queue depth and with no tags left, 
and so I want to use bio_endio with an error 
code.

What are those error codes, and will they work 
for my intended function?  Or is there a better 
way aside from bio_endio? Thanks!



Sent from Samsung Mobile
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