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io_uring: use constants for cq_overflow bitfield

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Prepare to use this bitfield for more flags by using constants instead of
magic value 0

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220421091345.2115755-5-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken 2022-04-21 02:13:43 -07:00 committed by Jens Axboe
parent 3e813c9026
commit 10988a0a67
1 changed files with 14 additions and 8 deletions
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22
fs/io_uring.c
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@ -431,7 +431,7 @@ struct io_ring_ctx {
struct wait_queue_head sqo_sq_wait;
struct list_head sqd_list;
unsigned long check_cq_overflow;
unsigned long check_cq;
struct {
/*
@ -903,6 +903,10 @@ struct io_cqe {
};
};
enum {
IO_CHECK_CQ_OVERFLOW_BIT,
};
/*
* NOTE! Each of the iocb union members has the file pointer
* as the first entry in their struct definition. So you can
@ -2024,7 +2028,7 @@ static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
all_flushed = list_empty(&ctx->cq_overflow_list);
if (all_flushed) {
clear_bit(0, &ctx->check_cq_overflow);
clear_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq);
WRITE_ONCE(ctx->rings->sq_flags,
ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW);
}
@ -2040,7 +2044,7 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx)
{
bool ret = true;
if (test_bit(0, &ctx->check_cq_overflow)) {
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) {
/* iopoll syncs against uring_lock, not completion_lock */
if (ctx->flags & IORING_SETUP_IOPOLL)
mutex_lock(&ctx->uring_lock);
@ -2118,7 +2122,7 @@ static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
return false;
}
if (list_empty(&ctx->cq_overflow_list)) {
set_bit(0, &ctx->check_cq_overflow);
set_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq);
WRITE_ONCE(ctx->rings->sq_flags,
ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW);
@ -2960,7 +2964,7 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
* If we do, we can potentially be spinning for commands that
* already triggered a CQE (eg in error).
*/
if (test_bit(0, &ctx->check_cq_overflow))
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
__io_cqring_overflow_flush(ctx, false);
if (io_cqring_events(ctx))
return 0;
@ -8300,7 +8304,8 @@ static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
* Cannot safely flush overflowed CQEs from here, ensure we wake up
* the task, and the next invocation will do it.
*/
if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow))
if (io_should_wake(iowq) ||
test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &iowq->ctx->check_cq))
return autoremove_wake_function(curr, mode, wake_flags, key);
return -1;
}
@ -8328,7 +8333,7 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
if (ret || io_should_wake(iowq))
return ret;
/* let the caller flush overflows, retry */
if (test_bit(0, &ctx->check_cq_overflow))
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
return 1;
if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS))
@ -10123,7 +10128,8 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
* Users may get EPOLLIN meanwhile seeing nothing in cqring, this
* pushs them to do the flush.
*/
if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow))
if (io_cqring_events(ctx) ||
test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;