In MD's resync I/O path, there are lots of direct access to bio's
bvec table. This patchset kills almost all, and the conversion
is quite straightforward. One root cause of direct access to bvec
table is that resync I/O uses the bio's bvec to manage pages.
In V1, as suggested by Shaohua, a new approach is used to manage
these pages for resync I/O, turns out code becomes more clean
and readable.
Once direct access to bvec table in MD is cleaned up, we may make
multipage bvec moving on.
V1:
- allocate page array to manage resync pages
Thanks,
Ming
Ming Lei (14):
block: introduce bio_segments_all()
block: introduce bio_remove_last_page()
md: raid1/raid10: use bio_remove_last_page()
md: move two macros into md.h
md: prepare for managing resync I/O pages in clean way
md: raid1: simplify r1buf_pool_free()
md: raid1: don't use bio's vec table to manage resync pages
md: raid1: retrieve page from pre-allocated resync page array
md: raid1: use bio helper in process_checks()
md: raid1: use bio_segments_all()
md: raid10: refactor code of read reshape's .bi_end_io
md: raid10: don't use bio's vec table to manage resync pages
md: raid10: retrieve page from preallocated resync page array
md: raid10: avoid direct access to bvec table in
handle_reshape_read_error
block/bio.c | 23 +++++++
drivers/md/md.h | 66 +++++++++++++++++++
drivers/md/raid1.c | 125 +++++++++++++++++++++--------------
drivers/md/raid10.c | 187 +++++++++++++++++++++++++++++++---------------------
include/linux/bio.h | 8 +++
5 files changed, 285 insertions(+), 124 deletions(-)
--
2.7.4
