diff options
| -rw-r--r-- | fs/io_uring.c | 17 | ||||
| -rw-r--r-- | include/uapi/linux/io_uring.h | 1 |
2 files changed, 15 insertions, 3 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 1fbe3eb78d08..7c44b0ef10d7 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6234,8 +6234,13 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) bool account_mem; int ret; - if (!entries || entries > IORING_MAX_ENTRIES) + if (!entries) return -EINVAL; + if (entries > IORING_MAX_ENTRIES) { + if (!(p->flags & IORING_SETUP_CLAMP)) + return -EINVAL; + entries = IORING_MAX_ENTRIES; + } /* * Use twice as many entries for the CQ ring. It's possible for the @@ -6252,8 +6257,13 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) * to a power-of-two, if it isn't already. We do NOT impose * any cq vs sq ring sizing. */ - if (p->cq_entries < p->sq_entries || p->cq_entries > IORING_MAX_CQ_ENTRIES) + if (p->cq_entries < p->sq_entries) return -EINVAL; + if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { + if (!(p->flags & IORING_SETUP_CLAMP)) + return -EINVAL; + p->cq_entries = IORING_MAX_CQ_ENTRIES; + } p->cq_entries = roundup_pow_of_two(p->cq_entries); } else { p->cq_entries = 2 * p->sq_entries; @@ -6345,7 +6355,8 @@ static long io_uring_setup(u32 entries, struct io_uring_params __user *params) } if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | - IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE)) + IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | + IORING_SETUP_CLAMP)) return -EINVAL; ret = io_uring_create(entries, &p); diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 8ad3cece5440..29fae13395a8 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -61,6 +61,7 @@ struct io_uring_sqe { #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ +#define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ enum { IORING_OP_NOP, |