add more bio helper

Christoph Hellwig <[email protected]>
Newsgroups org.kernel.vger.linux-bcache,dev.linux.lists.dm-devel,dev.linux.lists.gfs2,org.kernel.vger.linux-block,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-pm,org.kernel.vger.linux-xfs
Message-ID <[email protected]>
Hi all,

this series adds more block layer helpers to remove boilerplate code when
adding memory to a bio or to even do the entire synchronous I/O.

The main aim is to avoid having to convert to a struct page in the caller
when adding kernel direct mapping or vmalloc memory.

Diffstat:
 block/bio.c                   |   57 ++++++++++++++++++++++
 block/blk-map.c               |  108 ++++++++++++++++--------------------------
 drivers/block/pktcdvd.c       |    2 
 drivers/block/rnbd/rnbd-srv.c |    7 --
 drivers/block/ublk_drv.c      |    3 -
 drivers/block/virtio_blk.c    |    4 -
 drivers/md/bcache/super.c     |    3 -
 drivers/md/dm-bufio.c         |    2 
 drivers/md/dm-integrity.c     |   16 ++----
 drivers/nvme/host/core.c      |    2 
 drivers/scsi/scsi_ioctl.c     |    2 
 drivers/scsi/scsi_lib.c       |    3 -
 fs/btrfs/scrub.c              |   10 ---
 fs/gfs2/ops_fstype.c          |   24 +++------
 fs/hfsplus/wrapper.c          |   46 +++--------------
 fs/xfs/xfs_bio_io.c           |   30 ++++-------
 fs/xfs/xfs_buf.c              |   27 +++-------
 fs/zonefs/super.c             |   34 ++++---------
 include/linux/bio.h           |   39 ++++++++++++++-
 include/linux/blk-mq.h        |    4 -
 kernel/power/swap.c           |  103 +++++++++++++++++-----------------------
 21 files changed, 253 insertions(+), 273 deletions(-)
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