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Subject[PATCH for-next] io_uring: return EBADFD when ring isn't in the right state
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This patch uniforms the returned error (EBADFD) when the ring state
(enabled/disabled) is not the expected one.

The changes affect io_uring_enter() and io_uring_register() syscalls.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---

Hi Jens,
I also updated the test/register-restrictions in liburing here:

https://github.com/stefano-garzarella/liburing (branch: fix-disabled-ring-error)

Thanks,
Stefano
---
fs/io_uring.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0490edfcdd88..cf5992e79d88 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8642,6 +8642,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
if (!percpu_ref_tryget(&ctx->refs))
goto out_fput;

+ ret = -EBADFD;
if (ctx->flags & IORING_SETUP_R_DISABLED)
goto out_fput;

@@ -9137,7 +9138,7 @@ static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,

/* Restrictions allowed only if rings started disabled */
if (!(ctx->flags & IORING_SETUP_R_DISABLED))
- return -EINVAL;
+ return -EBADFD;

/* We allow only a single restrictions registration */
if (ctx->restrictions.registered)
@@ -9201,7 +9202,7 @@ static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,
static int io_register_enable_rings(struct io_ring_ctx *ctx)
{
if (!(ctx->flags & IORING_SETUP_R_DISABLED))
- return -EINVAL;
+ return -EBADFD;

if (ctx->restrictions.registered)
ctx->restricted = 1;
--
2.26.2
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