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io_uring: introduce struct io_ctx_config 

There will be more information needed during ctx setup, and instead of
passing a handful of pointers around, wrap them all into a new
structure. Add a helper for encapsulating all configuration checks and
preparation, that's also reused for ring resizing.

Note, it indirectly adds a io_uring_sanitise_params() check to ring
resizing, which is a good thing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1354/merge
Pavel Begunkov 2025-11-12 12:45:56 +00:00 committed by Jens Axboe
parent 929dbbb699
commit 0f4b537363
3 changed files with 40 additions and 16 deletions
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41
io_uring/io_uring.c
View File

@ -3480,7 +3480,7 @@ static int io_uring_sanitise_params(struct io_uring_params *p)
return 0;
}
int io_uring_fill_params(struct io_uring_params *p)
static int io_uring_fill_params(struct io_uring_params *p)
{
unsigned entries = p->sq_entries;
@ -3545,12 +3545,9 @@ int io_uring_fill_params(struct io_uring_params *p)
return 0;
}
static __cold int io_uring_create(struct io_uring_params *p,
struct io_uring_params __user *params)
int io_prepare_config(struct io_ctx_config *config)
{
struct io_ring_ctx *ctx;
struct io_uring_task *tctx;
struct file *file;
struct io_uring_params *p = &config->p;
int ret;
ret = io_uring_sanitise_params(p);
@ -3558,7 +3555,22 @@ static __cold int io_uring_create(struct io_uring_params *p,
return ret;
ret = io_uring_fill_params(p);
if (unlikely(ret))
if (ret)
return ret;
return 0;
}
static __cold int io_uring_create(struct io_ctx_config *config)
{
struct io_uring_params *p = &config->p;
struct io_ring_ctx *ctx;
struct io_uring_task *tctx;
struct file *file;
int ret;
ret = io_prepare_config(config);
if (ret)
return ret;
ctx = io_ring_ctx_alloc(p);
@ -3631,7 +3643,7 @@ static __cold int io_uring_create(struct io_uring_params *p,
p->features = IORING_FEAT_FLAGS;
if (copy_to_user(params, p, sizeof(*p))) {
if (copy_to_user(config->uptr, p, sizeof(*p))) {
ret = -EFAULT;
goto err;
}
@ -3684,16 +3696,19 @@ err_fput:
*/
static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
{
struct io_uring_params p;
struct io_ctx_config config;
if (copy_from_user(&p, params, sizeof(p)))
memset(&config, 0, sizeof(config));
if (copy_from_user(&config.p, params, sizeof(config.p)))
return -EFAULT;
if (!mem_is_zero(&p.resv, sizeof(p.resv)))
if (!mem_is_zero(&config.p.resv, sizeof(config.p.resv)))
return -EINVAL;
p.sq_entries = entries;
return io_uring_create(&p, params);
config.p.sq_entries = entries;
config.uptr = params;
return io_uring_create(&config);
}
static inline int io_uring_allowed(void)

8
io_uring/io_uring.h
View File

@ -17,6 +17,11 @@
#include <trace/events/io_uring.h>
#endif
struct io_ctx_config {
struct io_uring_params p;
struct io_uring_params __user *uptr;
};
#define IORING_FEAT_FLAGS (IORING_FEAT_SINGLE_MMAP |\
IORING_FEAT_NODROP |\
IORING_FEAT_SUBMIT_STABLE |\
@ -136,7 +141,8 @@ static inline bool io_should_wake(struct io_wait_queue *iowq)
unsigned long rings_size(unsigned int flags, unsigned int sq_entries,
unsigned int cq_entries, size_t *sq_offset);
int io_uring_fill_params(struct io_uring_params *p);
int io_prepare_config(struct io_ctx_config *config);
bool io_cqe_cache_refill(struct io_ring_ctx *ctx, bool overflow, bool cqe32);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
int io_run_local_work(struct io_ring_ctx *ctx, int min_events, int max_events);

7
io_uring/register.c
View File

@ -398,13 +398,16 @@ static void io_register_free_rings(struct io_ring_ctx *ctx,
static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
{
struct io_ctx_config config;
struct io_uring_region_desc rd;
struct io_ring_ctx_rings o = { }, n = { }, *to_free = NULL;
size_t size, sq_array_offset;
unsigned i, tail, old_head;
struct io_uring_params __p, *p = &__p;
struct io_uring_params *p = &config.p;
int ret;
memset(&config, 0, sizeof(config));
/* limited to DEFER_TASKRUN for now */
if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
return -EINVAL;
@ -416,7 +419,7 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
/* properties that are always inherited */
p->flags |= (ctx->flags & COPY_FLAGS);
ret = io_uring_fill_params(p);
ret = io_prepare_config(&config);
if (unlikely(ret))
return ret;