Hi, Interests[1] have been shown in multipage bvecs, so this patchset try to prepare for the support and do two things: 1) the 1st 4 patches use bvec iterator to implement iterate_bvec(), then we can drop the non-standard way for iterating bvec, which can be thought as a good cleanup for lib/iov_iter.c 2) remove BIO_MAX_SECTORS and makre BIO_MAX_SIZE as obsolete, and now there is only one user for each. Once multipage bvecs is introduced, one bio may hold lots of sectors, and we should always use sort of BIO_MAX_VECS which should be introduced in future and is similiar with current BIO_MAX_PAGES. The only functional change is iterate_bvec():lib/iov_iter.c xfstests(-a auto) over loop aio is run for ext4/xfs to verify the change and no regression found with this patchset. V6: - rebased on v4.7-rc1 - add reviewed-by tag - mark BIO_MAX_SIZE as obsolete instead of removing because dm-tree adds one usage now V5: - use bvec's iterator to figure new base vec address and update 'skip' correctly - run xfstests(-a auto) on loop aio/dio for verifying the change in iterate_bvec(), and no regression reported - use stree-ng to trigger heavy swap over swapfile to verify change in iterate_bvec() too, looks everything is fine V4: - make xfstests cover xfs - rebase on for-next of block tree V3: - include kenrel.h & bug.h in bvec.h for fix comiling failure on arm as reported by 0day ktest - build test on arm & arm64 V2: - rename bvec_iter.h as bvec.h - always include bvec.h into blk_types.h as suggested by Christoph V1: - don't move BIO_MAX_* to bvec_iter.h as pointed out by Christoph - run xfstests against v4.6-rc1-next-20160329 - add Reviewed-by - for 1,4 and 5, Reviewd-by not added, Christoph still expressed 'this looks fine to me.' Ming Lei (8): block: move bvec iterator into include/linux/bvec.h block: move two bvec structure into bvec.h block: mark 1st parameter of bvec_iter_advance as const iov_iter: use bvec iterator to implement iterate_bvec() fs: xfs: replace BIO_MAX_SECTORS with BIO_MAX_PAGES block: bio: remove BIO_MAX_SECTORS block: drbd: avoid to use BIO_MAX_SIZE block: mark BIO_MAX_SIZE as obsolete drivers/block/drbd/drbd_int.h | 4 +- fs/xfs/xfs_buf.c | 4 +- include/linux/bio.h | 58 ++++---------------------- include/linux/blk_types.h | 22 +--------- include/linux/bvec.h | 96 +++++++++++++++++++++++++++++++++++++++++++ lib/iov_iter.c | 45 +++++++------------- 6 files changed, 122 insertions(+), 107 deletions(-) create mode 100644 include/linux/bvec.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
