[PATCH v2] Support for write stream IDs

[Jens Axboe <axboe@fb.com>]

Hi,

v2 of this posting. Changes since v1:

- Rebased on top of current master.

- Fix EINVAL -> -EINVAL typo.

- Cleanup up BIO_STREAM_OFFSET definition.

- Pack i_streamid and f_streamid better into struct file and struct
  inode.

- Add a separate per-file hint, FADV_FILE_STREAMID. This only sets
  the write stream on the file, not the inode. FADV_STREAMID sets
  the hint both in the file and the inode.

 block/bio.c                  |    2 ++
 block/blk-core.c             |    3 +++
 fs/btrfs/extent_io.c         |    1 +
 fs/btrfs/inode.c             |    1 +
 fs/buffer.c                  |    4 ++--
 fs/direct-io.c               |    4 ++++
 fs/ext4/page-io.c            |    1 +
 fs/inode.c                   |    1 +
 fs/mpage.c                   |    1 +
 fs/open.c                    |    1 +
 fs/xfs/xfs_aops.c            |    1 +
 include/linux/blk_types.h    |   28 +++++++++++++++++++++++++++-
 include/linux/fs.h           |   22 ++++++++++++++++++++++
 include/uapi/linux/fadvise.h |    3 +++
 mm/fadvise.c                 |   25 +++++++++++++++++++++++++
 15 files changed, 95 insertions(+), 3 deletions(-)