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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 09-21-2012, 12:35 AM
Tejun Heo
 
Default block: Add bio_for_each_segment_all()

Hello,

On Mon, Sep 10, 2012 at 05:22:31PM -0700, Kent Overstreet wrote:
> This is part of the immutable bvec prep work; bio_for_each_segment() is
> going to have a different implementation so these need to be split
> apart.
>
> This change is also to better document the intent of code that's using
> it - bio_for_each_segment_all() is only legal to use for code that owns
> the bio.

How about something like following?

__bio_for_each_segment() iterates bvecs from the specified index
instead of bio->bv_idx. Currently, the only usage is to walk all the
bvecs after the bio has been advanced by specifying 0 index.

To help immutable bvec implementation, replace it with
bio_for_each_segment_all() which also better documents the intent of
code that's using it. Note that bio_for_each_segment_all() should
only be used by the code which owns the bio.

--
tejun

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