[PATCHv5 00/11] direct-io dma alignment

[Keith Busch]

From: Keith Busch <kbusch at kernel.org>

The most significant change from v4 is the alignment is now checked
prior to building the bio. This gets the expected EINVAL error for
misaligned userspace iovecs in all cases now (Eric Biggers).

I've removed the legacy fs change, so only iomap filesystems get to use
this alignement capability (Christoph Hellwig).

The block fops check for alignment returns a bool now (Damien).

Adjusted some comments, docs, and other minor style issues.

Reviews added for unchanged or trivially changed patches, removed
reviews for ones that changed more significantly.

As before, I tested using 'fio' with forced misaligned user buffers on
raw block, xfs, and ext4 (example raw block profile below).

  [global]
  filename=/dev/nvme0n1
  ioengine=io_uring
  verify=crc32c
  rw=randwrite
  iodepth=64
  direct=1

  [small]
  stonewall
  bsrange=4k-64k
  iomem_align=4

  [large]
  stonewall
  bsrange=512k-4M
  iomem_align=100

Keith Busch (11):
  block: fix infinite loop for invalid zone append
  block/bio: remove duplicate append pages code
  block: export dma_alignment attribute
  block: introduce bdev_dma_alignment helper
  block: add a helper function for dio alignment
  block/merge: count bytes instead of sectors
  block/bounce: count bytes instead of sectors
  iov: introduce iov_iter_aligned
  block: introduce bdev_iter_is_aligned helper
  block: relax direct io memory alignment
  fs: add support for dma aligned direct-io

 Documentation/ABI/stable/sysfs-block |   9 +++
 block/bio.c                          | 114 ++++++++++++---------------
 block/blk-merge.c                    |  41 ++++++----
 block/blk-sysfs.c                    |   7 ++
 block/bounce.c                       |  13 ++-
 block/fops.c                         |  16 ++--
 fs/iomap/direct-io.c                 |   4 +-
 include/linux/blkdev.h               |  12 +++
 include/linux/uio.h                  |   2 +
 lib/iov_iter.c                       |  92 +++++++++++++++++++++
 10 files changed, 219 insertions(+), 91 deletions(-)

-- 
2.30.2