V5 series, towards extending write-hint/streams infrastructure for kernel-components, and adding support for sending write-hint with Ext4/JBD2 journal. Here is the history/changelog - Changes since v4: - Removed write-hint field from request. bi_write_hint in bio is used for merging checks now. - Modified write-hint-to-stream conversion logic. Now, kernel hints are mapped to upper range of stream-ids, while user-hints continue to remain mapped to lower range of stream-ids. 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. - Stream feature is not disabled anymore if device reports less streams than a particular number (which was set as 4 earlier). - Any write-hint beyond reported stream-count 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) V4 patch: https://lkml.org/lkml/2019/4/17/870 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 | 29 ++++++++++++++++++++++++++++- block/blk-merge.c | 4 ++-- 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 | 8 ++++++-- include/linux/buffer_head.h | 3 +++ include/linux/fs.h | 2 ++ include/linux/jbd2.h | 8 ++++++++ 14 files changed, 97 insertions(+), 30 deletions(-) -- 2.7.4
