diff options
| -rw-r--r-- | lib/scatterlist.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c index a1cf8cae60e..c35b929435f 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; |