[PATCH v2 0/4] Write-hint for FS journal

Kanchan Joshi
2019-01-09T15:30:57Z

Towards supporing write-hints/streams for filesystem journal.

Here is the v1 patch for background -
https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2

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)

Kanchan Joshi (4):
block: Increase count of supported write-hints
fs: introduce four macros for in-kernel hints
fs: introduce APIs to enable sending write-hint with buffer-head
fs/ext4,jbd2: add support for passing write-hint with journal.

fs/buffer.c | 18 ++++++++++++++++--
fs/ext4/super.c | 2 ++
fs/jbd2/commit.c | 11 +++++++----
fs/jbd2/journal.c | 3 ++-
fs/jbd2/revoke.c | 3 ++-
include/linux/blkdev.h | 5 ++++-
include/linux/buffer_head.h | 3 +++
include/linux/fs.h | 5 +++++
include/linux/jbd2.h | 8 ++++++++
9 files changed, 49 insertions(+), 9 deletions(-)

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2.7.4