This RFC provides a rough implementation of a mechanism to allow
userspace to attach protection information (e.g. T10 DIF) data to a
disk write and to receive the information alongside a disk read.
The interface is an extension to the io_uring interface:
two new commands (IORING_OP_READV{WRITEV}_PI) are provided.
The last struct iovec in the arg list is interpreted to point to a buffer
containing the the PI data.
Patch #1 add two new commands to io_uring.
Patch #2 introduces two helper funcs in bio-integrity.
Patch #3 implement the PI passthrough in direct-io of block-dev.
(Similar extensions may add to fs/direct-io.c and fs/maps/directio.c)
Patch #4 add io_uring use space test case to liburing.
Welcome any feedbacks.
Thanks!
There was attempt before[1], but was based on AIO at that time.
[1] https://www.mail-archive.com/linux-scsi@xxxxxxxxxxxxxxx/msg27537.html
Bob Liu (3):
io_uring: add IORING_OP_READ{WRITE}V_PI cmd
bio-integrity: introduce two funcs handle protect information
block_dev: support protect information passthrough
block/bio-integrity.c | 77 +++++++++++++++++++++++++++++++++++++++++++
fs/block_dev.c | 17 ++++++++++
fs/io_uring.c | 12 +++++++
include/linux/bio.h | 14 ++++++++
include/linux/fs.h | 1 +
include/uapi/linux/io_uring.h | 2 ++
6 files changed, 123 insertions(+)
--
2.9.5
