[PATCH v4 00/15] Pass data lifetime information to SCSI disk devices

Bart Van Assche
2023-11-14T21:41:48Z

Hi Martin,

UFS vendors need the data lifetime information to achieve good performance.
Providing data lifetime information to UFS devices can result in up to 40%
lower write amplification. Hence this patch series that adds support in F2FS
and also in the block layer for data lifetime information. The SCSI disk (sd)
driver is modified such that it passes write hint information to SCSI devices
via the GROUP NUMBER field.

Please consider this patch series for the next merge window.

Thank you,

Bart.

Changes compared to v3:
- Renamed the data lifetime constants (WRITE_LIFE_*).
- Fixed a checkpatch complaint by changing "unsigned" into "unsigned int".
- Rebased this patch series on top of kernel v6.7-rc1.

Changes compared to v2:
- Instead of storing data lifetime information in bi_ioprio, introduce the
new struct bio member bi_lifetime and also the struct request member
'lifetime'.
- Removed the bio_set_data_lifetime() and bio_get_data_lifetime() functions
and replaced these with direct assignments.
- Dropped all changes related to I/O priority.
- Improved patch descriptions.

Changes compared to v1:
- Use six bits from the ioprio field for data lifetime information. The
bio->bi_write_hint / req->write_hint / iocb->ki_hint members that were
introduced in v1 have been removed again.
- The F_GET_FILE_RW_HINT and F_SET_FILE_RW_HINT fcntls have been removed.
- In the SCSI disk (sd) driver, query the stream status and check the PERM bit.
- The GET STREAM STATUS command has been implemented in the scsi_debug driver.

Bart Van Assche (15):
fs: Rename the kernel-internal data lifetime constants
fs: Move enum rw_hint into a new header file
block: Restore data lifetime support in struct bio and struct request
fs: Restore write hint support
fs/f2fs: Restore data lifetime support
scsi: core: Query the Block Limits Extension VPD page
scsi_proto: Add structures and constants related to I/O groups and
streams
sd: Translate data lifetime information
scsi_debug: Reduce code duplication
scsi_debug: Support the block limits extension VPD page
scsi_debug: Rework page code error handling
scsi_debug: Rework subpage code error handling
scsi_debug: Implement the IO Advice Hints Grouping mode page
scsi_debug: Implement GET STREAM STATUS
scsi_debug: Maintain write statistics per group number

Documentation/filesystems/f2fs.rst | 70 ++++++++
block/bio.c | 2 +
block/blk-crypto-fallback.c | 1 +
block/blk-merge.c | 6 +
block/blk-mq.c | 1 +
block/bounce.c | 1 +
block/fops.c | 3 +
drivers/scsi/scsi.c | 2 +
drivers/scsi/scsi_debug.c | 247 +++++++++++++++++++++--------
drivers/scsi/scsi_sysfs.c | 10 ++
drivers/scsi/sd.c | 111 ++++++++++++-
drivers/scsi/sd.h | 3 +
fs/f2fs/data.c | 2 +
fs/f2fs/f2fs.h | 10 ++
fs/f2fs/segment.c | 99 +++++++++++-
fs/f2fs/super.c | 32 +++-
fs/fcntl.c | 1 +
fs/inode.c | 3 +-
fs/iomap/buffered-io.c | 2 +
fs/iomap/direct-io.c | 1 +
fs/mpage.c | 1 +
include/linux/blk-mq.h | 2 +
include/linux/blk_types.h | 2 +
include/linux/fs.h | 16 +-
include/linux/rw_hint.h | 20 +++
include/scsi/scsi_device.h | 1 +
include/scsi/scsi_proto.h | 75 +++++++++
27 files changed, 638 insertions(+), 86 deletions(-)
create mode 100644 include/linux/rw_hint.h