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io_uring: encapsulate extraneous wait flags into a separate struct

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Rather than need to pass in 2 or 3 separate arguments, add a struct
to encapsulate the timeout and sigset_t parts of waiting. In preparation
for adding another argument for waiting.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-08-15 16:13:32 -06:00
parent 2b8e976b98
commit f42b58e448
1 changed files with 24 additions and 21 deletions
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45
io_uring/io_uring.c
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@ -2384,13 +2384,18 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
return ret;
}
struct ext_arg {
size_t argsz;
struct __kernel_timespec __user *ts;
const sigset_t __user *sig;
};
/*
* Wait until events become available, if we don't already have some. The
* application must reap them itself, as they reside on the shared cq ring.
*/
static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
const sigset_t __user *sig, size_t sigsz,
struct __kernel_timespec __user *uts)
struct ext_arg *ext_arg)
{
struct io_wait_queue iowq;
struct io_rings *rings = ctx->rings;
@ -2415,10 +2420,10 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
iowq.timeout = KTIME_MAX;
if (uts) {
if (ext_arg->ts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
if (get_timespec64(&ts, ext_arg->ts))
return -EFAULT;
iowq.timeout = timespec64_to_ktime(ts);
@ -2426,14 +2431,14 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
iowq.timeout = ktime_add(iowq.timeout, io_get_time(ctx));
}
if (sig) {
if (ext_arg->sig) {
#ifdef CONFIG_COMPAT
if (in_compat_syscall())
ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
sigsz);
ret = set_compat_user_sigmask((const compat_sigset_t __user *)ext_arg->sig,
ext_arg->argsz);
else
#endif
ret = set_user_sigmask(sig, sigsz);
ret = set_user_sigmask(ext_arg->sig, ext_arg->argsz);
if (ret)
return ret;
@ -3112,9 +3117,8 @@ static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t a
return 0;
}
static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz,
struct __kernel_timespec __user **ts,
const sigset_t __user **sig)
static int io_get_ext_arg(unsigned flags, const void __user *argp,
struct ext_arg *ext_arg)
{
struct io_uring_getevents_arg arg;
@ -3123,8 +3127,8 @@ static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz
* is just a pointer to the sigset_t.
*/
if (!(flags & IORING_ENTER_EXT_ARG)) {
*sig = (const sigset_t __user *) argp;
*ts = NULL;
ext_arg->sig = (const sigset_t __user *) argp;
ext_arg->ts = NULL;
return 0;
}
@ -3132,15 +3136,15 @@ static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz
* EXT_ARG is set - ensure we agree on the size of it and copy in our
* timespec and sigset_t pointers if good.
*/
if (*argsz != sizeof(arg))
if (ext_arg->argsz != sizeof(arg))
return -EINVAL;
if (copy_from_user(&arg, argp, sizeof(arg)))
return -EFAULT;
if (arg.pad)
return -EINVAL;
*sig = u64_to_user_ptr(arg.sigmask);
*argsz = arg.sigmask_sz;
*ts = u64_to_user_ptr(arg.ts);
ext_arg->sig = u64_to_user_ptr(arg.sigmask);
ext_arg->argsz = arg.sigmask_sz;
ext_arg->ts = u64_to_user_ptr(arg.ts);
return 0;
}
@ -3246,15 +3250,14 @@ iopoll_locked:
}
mutex_unlock(&ctx->uring_lock);
} else {
const sigset_t __user *sig;
struct __kernel_timespec __user *ts;
struct ext_arg ext_arg = { .argsz = argsz };
ret2 = io_get_ext_arg(flags, argp, &argsz, &ts, &sig);
ret2 = io_get_ext_arg(flags, argp, &ext_arg);
if (likely(!ret2)) {
min_complete = min(min_complete,
ctx->cq_entries);
ret2 = io_cqring_wait(ctx, min_complete, flags,
sig, argsz, ts);
&ext_arg);
}
}