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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-03-17 18:15:03 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-04-07 21:15:45 +0400
commitb1adaf65ba0398c9a1adc8f3a274533165a4df61 (patch)
tree70c6c5944eb978c6eff55eab1e1b1df7049477ec /include/linux/scatterlist.h
parent78b4b05db57b04b3ed17dc71259bf1402c04abfa (diff)
downloadlinux-b1adaf65ba0398c9a1adc8f3a274533165a4df61.tar.xz
[SCSI] block: add sg buffer copy helper functions
This patch adds new three helper functions to copy data between an SG list and a linear buffer. - sg_copy_from_buffer copies data from linear buffer to an SG list - sg_copy_to_buffer copies data from an SG list to a linear buffer When the APIs copy data from a linear buffer to an SG list, flush_kernel_dcache_page is called. It's not necessary for everyone but it's a no-op on most architectures and in general the API is not used in performance critical path. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'include/linux/scatterlist.h')
-rw-r--r--include/linux/scatterlist.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index a3d567a974e8..71fc81360048 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -213,6 +213,11 @@ int __sg_alloc_table(struct sg_table *, unsigned int, unsigned int, gfp_t,
sg_alloc_fn *);
int sg_alloc_table(struct sg_table *, unsigned int, gfp_t);
+size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+ void *buf, size_t buflen);
+size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
+ void *buf, size_t buflen);
+
/*
* Maximum number of entries that will be allocated in one piece, if
* a list larger than this is required then chaining will be utilized.