author: Akinobu Mita <akinobu.mita@gmail.com> 2013-07-08 16:01:52 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2013-07-09 10:33:30 -0700
commit: 1105200480b4faeb673d1b23658650b003302c06
parent: 0ea8530dcf762526459b29ac713a623b51fd691f
Commit Summary:
Diffstat:
1 file changed, 20 insertions, 13 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index a1cf8cae60e7..c35b929435f3 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -453,6 +453,28 @@ void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl,
}
EXPORT_SYMBOL(sg_miter_start);
+static bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
+{
+ if (!miter->__remaining) {
+ struct scatterlist *sg;
+ unsigned long pgoffset;
+
+ if (!__sg_page_iter_next(&miter->piter))
+ return false;
+
+ sg = miter->piter.sg;
+ pgoffset = miter->piter.sg_pgoffset;
+
+ miter->__offset = pgoffset ? 0 : sg->offset;
+ miter->__remaining = sg->offset + sg->length -
+ (pgoffset << PAGE_SHIFT) - miter->__offset;
+ miter->__remaining = min_t(unsigned long, miter->__remaining,
+ PAGE_SIZE - miter->__offset);
+ }
+
+ return true;
+}
+
/**
* sg_miter_next - proceed mapping iterator to the next mapping
* @miter: sg mapping iter to proceed
@@ -478,22 +500,9 @@ bool sg_miter_next(struct sg_mapping_iter *miter)
* Get to the next page if necessary.
* __remaining, __offset is adjusted by sg_miter_stop
*/
- if (!miter->__remaining) {
- struct scatterlist *sg;
- unsigned long pgoffset;
-
- if (!__sg_page_iter_next(&miter->piter))
- return false;
-
- sg = miter->piter.sg;
- pgoffset = miter->piter.sg_pgoffset;
+ if (!sg_miter_get_next_page(miter))
+ return false;
- miter->__offset = pgoffset ? 0 : sg->offset;
- miter->__remaining = sg->offset + sg->length -
- (pgoffset << PAGE_SHIFT) - miter->__offset;
- miter->__remaining = min_t(unsigned long, miter->__remaining,
- PAGE_SIZE - miter->__offset);
- }
miter->page = sg_page_iter_page(&miter->piter);
miter->consumed = miter->length = miter->__remaining;