Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszer...

[linux-2.6-block.git] / include / crypto / scatterwalk.h

diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 35f99b68d037066b987a90ae24b6b6ba5bd00d09..880e6be9e95e1ddfae2661024227d165ad190d32 100644 (file)
--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -16,14 +16,10 @@
 #ifndef _CRYPTO_SCATTERWALK_H
 #define _CRYPTO_SCATTERWALK_H
 
-#include <asm/kmap_types.h>
 #include <crypto/algapi.h>
-#include <linux/hardirq.h>
 #include <linux/highmem.h>
 #include <linux/kernel.h>
-#include <linux/mm.h>
 #include <linux/scatterlist.h>
-#include <linux/sched.h>
 
 static inline void scatterwalk_crypto_chain(struct scatterlist *head,
                                            struct scatterlist *sg,
@@ -83,17 +79,53 @@ static inline void scatterwalk_unmap(void *vaddr)
        kunmap_atomic(vaddr);
 }
 
-void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
+static inline void scatterwalk_start(struct scatter_walk *walk,
+                                    struct scatterlist *sg)
+{
+       walk->sg = sg;
+       walk->offset = sg->offset;
+}
+
+static inline void *scatterwalk_map(struct scatter_walk *walk)
+{
+       return kmap_atomic(scatterwalk_page(walk)) +
+              offset_in_page(walk->offset);
+}
+
+static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
+                                       unsigned int more)
+{
+       if (out) {
+               struct page *page;
+
+               page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
+               /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
+                * PageSlab cannot be optimised away per se due to
+                * use of volatile pointer.
+                */
+               if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
+                       flush_dcache_page(page);
+       }
+
+       if (more && walk->offset >= walk->sg->offset + walk->sg->length)
+               scatterwalk_start(walk, sg_next(walk->sg));
+}
+
+static inline void scatterwalk_done(struct scatter_walk *walk, int out,
+                                   int more)
+{
+       if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
+           !(walk->offset & (PAGE_SIZE - 1)))
+               scatterwalk_pagedone(walk, out, more);
+}
+
 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
                            size_t nbytes, int out);
 void *scatterwalk_map(struct scatter_walk *walk);
-void scatterwalk_done(struct scatter_walk *walk, int out, int more);
 
 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
                              unsigned int start, unsigned int nbytes, int out);
 
-int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes);
-
 struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
                                     struct scatterlist *src,
                                     unsigned int len);