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authorSebastian Andrzej Siewior <sebastian@breakpoint.cc>2009-06-18 12:19:12 +0400
committerPierre Ossman <pierre@ossman.eu>2009-07-31 14:28:45 +0400
commit6de7e356faf54aa75de5b624bbce28a5b776dfa8 (patch)
tree09b341b7c1371448a5ae8a9cd4009a4f81f4a3dd /include/linux
parentb592972493c38665efd7d429a01b23fcb21e331a (diff)
downloadlinux-6de7e356faf54aa75de5b624bbce28a5b776dfa8.tar.xz
lib/scatterlist: add a flags to signalize mapping direction
sg_miter_start() is currently unaware of the direction of the copy process (to or from the scatter list). It is important to know the direction because the page has to be flushed in case the data written is seen on a different mapping in user land on cache incoherent architectures. Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/scatterlist.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index e5996984ddd0..9aaf5bfdad1a 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -242,6 +242,8 @@ size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
*/
#define SG_MITER_ATOMIC (1 << 0) /* use kmap_atomic */
+#define SG_MITER_TO_SG (1 << 1) /* flush back to phys on unmap */
+#define SG_MITER_FROM_SG (1 << 2) /* nop */
struct sg_mapping_iter {
/* the following three fields can be accessed directly */