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| author | Pavel Begunkov <asml.silence@gmail.com> | 2022-06-16 10:22:08 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:13 -0600 |
| commit | 97bbdc06a4446bc69d8ba71d722abae542a6b70c (patch) | |
| tree | baffdfeb97b0aedcd0a72095fd6538face7d5621 /io_uring/tctx.c | |
| parent | 0ec6dca223195aca2f7df6e432c4205b5f63305b (diff) | |
| download | linux-97bbdc06a4446bc69d8ba71d722abae542a6b70c.tar.bz2 | |
io_uring: add IORING_SETUP_SINGLE_ISSUER
Add a new IORING_SETUP_SINGLE_ISSUER flag and the userspace visible part
of it, i.e. put limitations of submitters. Also, don't allow it together
with IOPOLL as we're not going to put it to good use.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4bcc41ee467fdf04c8aab8baf6ce3ba21858c3d4.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/tctx.c')
| -rw-r--r-- | io_uring/tctx.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/io_uring/tctx.c b/io_uring/tctx.c index 5a5d4f908529..a819da8fc85c 100644 --- a/io_uring/tctx.c +++ b/io_uring/tctx.c @@ -94,12 +94,32 @@ __cold int io_uring_alloc_task_context(struct task_struct *task, return 0; } -int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) +static int io_register_submitter(struct io_ring_ctx *ctx) +{ + int ret = 0; + + mutex_lock(&ctx->uring_lock); + if (!ctx->submitter_task) + ctx->submitter_task = get_task_struct(current); + else if (ctx->submitter_task != current) + ret = -EEXIST; + mutex_unlock(&ctx->uring_lock); + + return ret; +} + +int __io_uring_add_tctx_node(struct io_ring_ctx *ctx, bool submitter) { struct io_uring_task *tctx = current->io_uring; struct io_tctx_node *node; int ret; + if ((ctx->flags & IORING_SETUP_SINGLE_ISSUER) && submitter) { + ret = io_register_submitter(ctx); + if (ret) + return ret; + } + if (unlikely(!tctx)) { ret = io_uring_alloc_task_context(current, ctx); if (unlikely(ret)) @@ -133,7 +153,8 @@ int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) list_add(&node->ctx_node, &ctx->tctx_list); mutex_unlock(&ctx->uring_lock); } - tctx->last = ctx; + if (submitter) + tctx->last = ctx; return 0; } @@ -241,7 +262,7 @@ int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, return -EINVAL; mutex_unlock(&ctx->uring_lock); - ret = io_uring_add_tctx_node(ctx); + ret = __io_uring_add_tctx_node(ctx, false); mutex_lock(&ctx->uring_lock); if (ret) return ret; |