introduce sg_pcopy_from_buffer() and sg_pcopy_to_buffer()

This patch set introduces sg_pcopy_from_buffer() and sg_pcopy_to_buffer(), which copy data between a linear buffer and an SG list.

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.

The main reason for introducing these functions is to fix a problem in scsi_debug module. And there is a local function in crypto/talitos module, which can be replaced by sg_pcopy_to_buffer().

* Changes from v2
- Add Acked-by line
- Rename sg_miter_seek() to sg_miter_skip()
- Remove the restriction on when sg_miter_skip() can be called

* Changes from v1
- Separate the change that factors out sg_miter_get_next_page() from the patch "introduce sg_pcopy_from_buffer() and sg_pcopy_to_buffer()"
- Add function comment for internal function sg_miter_seek()
- Simplify the assignment of sdb->resid in fill_from_dev_buffer() in scsi_debug

Akinobu Mita (4):
lib/scatterlist: factor out sg_miter_get_next_page() from

    sg_miter_next()

lib/scatterlist: introduce sg_pcopy_from_buffer() and
sg_pcopy_to_buffer()
crypto: talitos: use sg_pcopy_to_buffer()
scsi_debug: fix do_device_access() with wrap around range

 drivers/crypto/talitos.c    |  60 +--------------------
 drivers/scsi/scsi_debug.c   |  48 +++++++++++++----
 include/linux/scatterlist.h |   5 ++
 lib/scatterlist.c           | 127 +++++++++++++++++++++++++++++++++++++-------
 4 files changed, 150 insertions(+), 90 deletions(-)

1.8.1.4