lib/scatterlist: introduce sg_pcopy_from_buffer() and sg_pcopy_to_buffer()

The only difference between sg_pcopy_{from,to}_buffer() and
sg_copy_{from,to}_buffer() is an additional argument that specifies the
number of bytes to skip the SG list before copying.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Horia Geanta <horia.geanta@freescale.com>
Cc: Imre Deak <imre.deak@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 2680677..adae88f 100644 (file)
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -244,6 +244,11 @@ size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
 size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
                         void *buf, size_t buflen);
 
+size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+                           void *buf, size_t buflen, off_t skip);
+size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
+                         void *buf, size_t buflen, off_t skip);
+
 /*
  * Maximum number of entries that will be allocated in one piece, if
  * a list larger than this is required then chaining will be utilized.

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index c35b929..129a82f 100644 (file)
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -475,6 +475,43 @@ static bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
        return true;
 }
 
+/**
+ * sg_miter_skip - reposition mapping iterator
+ * @miter: sg mapping iter to be skipped
+ * @offset: number of bytes to plus the current location
+ *
+ * Description:
+ *   Sets the offset of @miter to its current location plus @offset bytes.
+ *   If mapping iterator @miter has been proceeded by sg_miter_next(), this
+ *   stops @miter.
+ *
+ * Context:
+ *   Don't care if @miter is stopped, or not proceeded yet.
+ *   Otherwise, preemption disabled if the SG_MITER_ATOMIC is set.
+ *
+ * Returns:
+ *   true if @miter contains the valid mapping.  false if end of sg
+ *   list is reached.
+ */
+static bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
+{
+       sg_miter_stop(miter);
+
+       while (offset) {
+               off_t consumed;
+
+               if (!sg_miter_get_next_page(miter))
+                       return false;
+
+               consumed = min_t(off_t, offset, miter->__remaining);
+               miter->__offset += consumed;
+               miter->__remaining -= consumed;
+               offset -= consumed;
+       }
+
+       return true;
+}
+
 /**
  * sg_miter_next - proceed mapping iterator to the next mapping
  * @miter: sg mapping iter to proceed
@@ -561,14 +598,16 @@ EXPORT_SYMBOL(sg_miter_stop);
  * @nents:              Number of SG entries
  * @buf:                Where to copy from
  * @buflen:             The number of bytes to copy
- * @to_buffer:                  transfer direction (non zero == from an sg list to a
- *                      buffer, 0 == from a buffer to an sg list
+ * @skip:               Number of bytes to skip before copying
+ * @to_buffer:          transfer direction (true == from an sg list to a
+ *                      buffer, false == from a buffer to an sg list
  *
  * Returns the number of copied bytes.
  *
  **/
 static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
-                            void *buf, size_t buflen, int to_buffer)
+                            void *buf, size_t buflen, off_t skip,
+                            bool to_buffer)
 {
        unsigned int offset = 0;
        struct sg_mapping_iter miter;
@@ -582,6 +621,9 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
 
        sg_miter_start(&miter, sgl, nents, sg_flags);
 
+       if (!sg_miter_skip(&miter, skip))
+               return false;
+
        local_irq_save(flags);
 
        while (sg_miter_next(&miter) && offset < buflen) {
@@ -616,7 +658,7 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
 size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
                           void *buf, size_t buflen)
 {
-       return sg_copy_buffer(sgl, nents, buf, buflen, 0);
+       return sg_copy_buffer(sgl, nents, buf, buflen, 0, false);
 }
 EXPORT_SYMBOL(sg_copy_from_buffer);
 
@@ -633,6 +675,42 @@ EXPORT_SYMBOL(sg_copy_from_buffer);
 size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
                         void *buf, size_t buflen)
 {
-       return sg_copy_buffer(sgl, nents, buf, buflen, 1);
+       return sg_copy_buffer(sgl, nents, buf, buflen, 0, true);
 }
 EXPORT_SYMBOL(sg_copy_to_buffer);
+
+/**
+ * sg_pcopy_from_buffer - Copy from a linear buffer to an SG list
+ * @sgl:                The SG list
+ * @nents:              Number of SG entries
+ * @buf:                Where to copy from
+ * @skip:               Number of bytes to skip before copying
+ * @buflen:             The number of bytes to copy
+ *
+ * Returns the number of copied bytes.
+ *
+ **/
+size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+                           void *buf, size_t buflen, off_t skip)
+{
+       return sg_copy_buffer(sgl, nents, buf, buflen, skip, false);
+}
+EXPORT_SYMBOL(sg_pcopy_from_buffer);
+
+/**
+ * sg_pcopy_to_buffer - Copy from an SG list to a linear buffer
+ * @sgl:                The SG list
+ * @nents:              Number of SG entries
+ * @buf:                Where to copy to
+ * @skip:               Number of bytes to skip before copying
+ * @buflen:             The number of bytes to copy
+ *
+ * Returns the number of copied bytes.
+ *
+ **/
+size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
+                         void *buf, size_t buflen, off_t skip)
+{
+       return sg_copy_buffer(sgl, nents, buf, buflen, skip, true);
+}
+EXPORT_SYMBOL(sg_pcopy_to_buffer);