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ublk: zc register/unregister bvec

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Provide new operations for the user to request mapping an active request
to an io uring instance's buf_table. The user has to provide the index
it wants to install the buffer.

A reference count is taken on the request to ensure it can't be
completed while it is active in a ring's buf_table.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20250227223916.143006-6-kbusch@meta.com
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2025-02-28 07:05:41 -07:00
committed by Jens Axboe
parent 27cb27b6d5
commit 1f6540e2aa
2 changed files with 56 additions and 7 deletions
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include/uapi/linux/ublk_cmd.h
+4
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@@ -94,6 +94,10 @@
_IOWR('u', UBLK_IO_COMMIT_AND_FETCH_REQ, struct ublksrv_io_cmd)
#define UBLK_U_IO_NEED_GET_DATA \
_IOWR('u', UBLK_IO_NEED_GET_DATA, struct ublksrv_io_cmd)
#define UBLK_U_IO_REGISTER_IO_BUF \
_IOWR('u', 0x23, struct ublksrv_io_cmd)
#define UBLK_U_IO_UNREGISTER_IO_BUF \
_IOWR('u', 0x24, struct ublksrv_io_cmd)
/* only ABORT means that no re-fetch */
#define UBLK_IO_RES_OK 0