From: Keith Busch <kbusch@xxxxxxxxxx> Previous version was discussed here: https://lore.kernel.org/linux-block/20250203154517.937623-1-kbusch@xxxxxxxx/ The same ublksrv reference code in that link was used to test the kernel side changes. Before listing what has changed, I want to mention what is the same: the reliance on the ring ctx lock to serialize the register ahead of any use. I'm not ignoring the feedback; I just don't have a solid answer right now, and want to progress on the other fronts in the meantime. Here's what's different from the previous: - Introduced an optional 'release' callback when the resource node is no longer referenced. The callback addresses any buggy applications that may complete their request and unregister their index while IO is in flight. This obviates any need to take extra page references since it prevents the request from completing. - Removed peeking into the io_cache element size and instead use a more intuitive bvec segment count limit to decide if we're caching the imu (suggested by Pavel). - Dropped the const request changes; it's not needed. - Merged up to latest block uring branch Jens Axboe (1): io_uring: use node for import Keith Busch (5): io_uring: create resource release callback io_uring: add support for kernel registered bvecs ublk: zc register/unregister bvec io_uring: add abstraction for buf_table rsrc data io_uring: cache nodes and mapped buffers drivers/block/ublk_drv.c | 145 ++++++++++++++----- include/linux/io_uring.h | 1 + include/linux/io_uring_types.h | 28 ++-- include/uapi/linux/ublk_cmd.h | 4 + io_uring/fdinfo.c | 8 +- io_uring/filetable.c | 2 +- io_uring/net.c | 5 +- io_uring/nop.c | 2 +- io_uring/register.c | 2 +- io_uring/rsrc.c | 252 ++++++++++++++++++++++++++------- io_uring/rsrc.h | 11 +- io_uring/rw.c | 4 +- io_uring/uring_cmd.c | 4 +- 13 files changed, 355 insertions(+), 113 deletions(-) -- 2.43.5
