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lib/scatterlist: use page iterator in the mapping iterator

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For better code reuse use the newly added page iterator to iterate
through the pages.  The offset, length within the page is still
calculated by the mapping iterator as well as the actual mapping.  Idea
from Tejun Heo.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Imre Deak
2013-02-27 17:02:57 -08:00
committed by Linus Torvalds
parent a321e91b6d
commit 4225fc8555
3 changed files with 29 additions and 31 deletions
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6
include/linux/scatterlist.h
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@@ -293,11 +293,11 @@ struct sg_mapping_iter {
void *addr; /* pointer to the mapped area */
size_t length; /* length of the mapped area */
size_t consumed; /* number of consumed bytes */
struct sg_page_iter piter; /* page iterator */
/* these are internal states, keep away */
struct scatterlist *__sg; /* current entry */
unsigned int __nents; /* nr of remaining entries */
unsigned int __offset; /* offset within sg */
unsigned int __offset; /* offset within page */
unsigned int __remaining; /* remaining bytes on page */
unsigned int __flags;
};