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Subject[PATCH v4 0/7] Extend write-hint/stream infrastructure
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V4 series, towards extending write-hint/streams infrastucture so that file-systems
and other kernel-mode components can use write-hints which are separate from
user-space ones. Also this introduces support for sending write-hint with
Ext4/JBD2 journal.

Here is the changelog/history -

Changes since v3:
- Correction in grouping related changes into patches
- Rectification in commit text at places

Changes since v2:
- Introduce API in block layer so that drivers can register stream info. Added
new limit in request queue for this purpose.
- Block layer does the conversion from write-hint to stream-id.
- Any write-hint beyond registered limit turn to 0.
- New macro "WRITE_LIFE_KERN_MIN" can be used as base by kernel mode components.

Changes since v1:
- introduce four more hints for in-kernel use, as recommended by Dave chinner
& Jens axboe. This isolates kernel-mode hints from user-mode ones.
- remove mount-option to specify write-hint, as recommended by Jan kara &
Dave chinner. Rather, FS always sets write-hint for journal. This gets ignored
if device does not support stream.
- Removed code-redundancy for write_dirty_buffer (Jan kara's review comment)

V3 patch:
https://marc.info/?l=linux-block&m=155384631909082&w=2

V2 patch:
https://patchwork.kernel.org/cover/10754405/

V1 patch:
https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2

Kanchan Joshi (7):
fs: introduce write-hint start point for in-kernel hints
block: increase stream count for in-kernel use
block: introduce API to register stream information with block-layer
block: introduce write-hint to stream-id conversion
nvme: register stream info with block layer
fs: introduce APIs to enable passing write-hint with buffer-head
fs/ext4,jbd2: add support for sending write-hint with journal

block/blk-core.c | 20 ++++++++++++++++++++
block/blk-settings.c | 12 ++++++++++++
drivers/nvme/host/core.c | 23 ++++++-----------------
fs/buffer.c | 18 ++++++++++++++++--
fs/ext4/ext4_jbd2.h | 1 +
fs/ext4/super.c | 2 ++
fs/jbd2/commit.c | 11 +++++++----
fs/jbd2/journal.c | 3 ++-
fs/jbd2/revoke.c | 3 ++-
include/linux/blkdev.h | 7 ++++++-
include/linux/buffer_head.h | 3 +++
include/linux/fs.h | 2 ++
include/linux/jbd2.h | 8 ++++++++
13 files changed, 87 insertions(+), 26 deletions(-)

--
2.7.4

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