Hi Jens,
UFS vendors need the data lifetime information to achieve good performance.
Without this information there is significantly higher write amplification due
to garbage collection. Hence this patch series that add 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.
Thanks,
Bart.
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):
block: Make bio_set_ioprio() modify fewer bio->bi_ioprio bits
blk-ioprio: Modify fewer bio->bi_ioprio bits
block: Support data lifetime in the I/O priority bitfield
fs: Restore write hint support
fs/f2fs: Restore the whint_mode mount option
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/blk-ioprio.c | 9 +-
block/blk-mq.c | 3 +-
drivers/scsi/scsi.c | 2 +
drivers/scsi/scsi_debug.c | 247 +++++++++++++++++++++--------
drivers/scsi/scsi_sysfs.c | 10 ++
drivers/scsi/sd.c | 112 ++++++++++++-
drivers/scsi/sd.h | 3 +
fs/f2fs/data.c | 3 +
fs/f2fs/f2fs.h | 9 ++
fs/f2fs/segment.c | 95 +++++++++++
fs/f2fs/super.c | 32 +++-
fs/iomap/buffered-io.c | 3 +
fs/mpage.c | 2 +
include/linux/fs-lifetime.h | 20 +++
include/linux/ioprio.h | 10 ++
include/scsi/scsi_device.h | 1 +
include/scsi/scsi_proto.h | 75 +++++++++
include/uapi/linux/ioprio.h | 8 +-
19 files changed, 639 insertions(+), 75 deletions(-)
create mode 100644 include/linux/fs-lifetime.h
