X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=crypto%2Fscatterwalk.h;h=f1592cc2d0f42bb76132667fe69cf3f5e61bb8cb;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=b16446519017f3509ad17209fa6ccbfffa2d1584;hpb=9213980e6a70d8473e0ffd4b39ab5b6caaba9ff5;p=linux-2.6.git

diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h
index b16446519..f1592cc2d 100644
--- a/crypto/scatterwalk.h
+++ b/crypto/scatterwalk.h
@@ -14,38 +14,64 @@
 
 #ifndef _CRYPTO_SCATTERWALK_H
 #define _CRYPTO_SCATTERWALK_H
+
 #include <linux/mm.h>
-#include <asm/scatterlist.h>
-
-struct scatter_walk {
-	struct scatterlist	*sg;
-	struct page		*page;
-	void			*data;
-	unsigned int		len_this_page;
-	unsigned int		len_this_segment;
-	unsigned int		offset;
-};
-
-/* Define sg_next is an inline routine now in case we want to change
-   scatterlist to a linked list later. */
+#include <linux/scatterlist.h>
+
+#include "internal.h"
+
 static inline struct scatterlist *sg_next(struct scatterlist *sg)
 {
-	return sg + 1;
+	return (++sg)->length ? sg : (void *)sg->page;
+}
+
+static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
+						struct scatter_walk *walk_out)
+{
+	return !(((walk_in->sg->page - walk_out->sg->page) << PAGE_SHIFT) +
+		 (int)(walk_in->offset - walk_out->offset));
+}
+
+static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
+{
+	unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
+	unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
+	return len_this_page > len ? len : len_this_page;
+}
+
+static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
+					     unsigned int nbytes)
+{
+	unsigned int len_this_page = scatterwalk_pagelen(walk);
+	return nbytes > len_this_page ? len_this_page : nbytes;
+}
+
+static inline void scatterwalk_advance(struct scatter_walk *walk,
+				       unsigned int nbytes)
+{
+	walk->offset += nbytes;
+}
+
+static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
+					       unsigned int alignmask)
+{
+	return !(walk->offset & alignmask);
+}
+
+static inline struct page *scatterwalk_page(struct scatter_walk *walk)
+{
+	return walk->sg->page + (walk->offset >> PAGE_SHIFT);
 }
 
-static inline int scatterwalk_samebuf(struct scatter_walk *walk_in,
-				      struct scatter_walk *walk_out,
-				      void *src_p, void *dst_p)
+static inline void scatterwalk_unmap(void *vaddr, int out)
 {
-	return walk_in->page == walk_out->page &&
-	       walk_in->offset == walk_out->offset &&
-	       walk_in->data == src_p && walk_out->data == dst_p;
+	crypto_kunmap(vaddr, out);
 }
 
-void *scatterwalk_whichbuf(struct scatter_walk *walk, unsigned int nbytes, void *scratch);
 void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
-int scatterwalk_copychunks(void *buf, struct scatter_walk *walk, size_t nbytes, int out);
-void scatterwalk_map(struct scatter_walk *walk, int out);
+void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
+			    size_t nbytes, int out);
+void *scatterwalk_map(struct scatter_walk *walk, int out);
 void scatterwalk_done(struct scatter_walk *walk, int out, int more);
 
 #endif  /* _CRYPTO_SCATTERWALK_H */