diff options
| author | Dylan Yudaken <dylany@fb.com> | 2022-09-26 10:09:25 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-26 11:26:18 -0600 |
| commit | 7cae596bc31f900bb72492ff40c7f5addf72fa19 (patch) | |
| tree | 9d9168b5820b727353aade8cdc9479eaefe9a344 | |
| parent | e775f93f2ab976a2cdb4a7b53063cbe890904f73 (diff) | |
| download | linux-sgx-7cae596bc31f900bb72492ff40c7f5addf72fa19.tar.gz | |
io_uring: register single issuer task at creation
Instead of picking the task from the first submitter task, rather use the
creator task or in the case of disabled (IORING_SETUP_R_DISABLED) the
enabling task.
This approach allows a lot of simplification of the logic here. This
removes init logic from the submission path, which can always be a bit
confusing, but also removes the need for locking to write (or read) the
submitter_task.
Users that want to move a ring before submitting can create the ring
disabled and then enable it on the submitting task.
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Fixes: 97bbdc06a444 ("io_uring: add IORING_SETUP_SINGLE_ISSUER")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | io_uring/io_uring.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 2965b354efc8e2..242d896c00f343 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3357,6 +3357,10 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, goto err; } + if (ctx->flags & IORING_SETUP_SINGLE_ISSUER + && !(ctx->flags & IORING_SETUP_R_DISABLED)) + ctx->submitter_task = get_task_struct(current); + file = io_uring_get_file(ctx); if (IS_ERR(file)) { ret = PTR_ERR(file); @@ -3548,6 +3552,9 @@ static int io_register_enable_rings(struct io_ring_ctx *ctx) if (!(ctx->flags & IORING_SETUP_R_DISABLED)) return -EBADFD; + if (ctx->flags & IORING_SETUP_SINGLE_ISSUER && !ctx->submitter_task) + ctx->submitter_task = get_task_struct(current); + if (ctx->restrictions.registered) ctx->restricted = 1; |