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io_uring: consolidate *_check_overflow accounting

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Add a helper to mark ctx->{cq,sq}_check_overflow to get rid of
duplicates, and it's clearer to check cq_overflow_list directly anyway.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-30 18:43:49 +03:00 committed by Jens Axboe
parent dd9dfcdf5a
commit 4693014340
1 changed files with 13 additions and 10 deletions
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23
fs/io_uring.c
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@ -1303,6 +1303,15 @@ static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
eventfd_signal(ctx->cq_ev_fd, 1);
}
static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
{
if (list_empty(&ctx->cq_overflow_list)) {
clear_bit(0, &ctx->sq_check_overflow);
clear_bit(0, &ctx->cq_check_overflow);
ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
}
}
/* Returns true if there are no backlogged entries after the flush */
static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
{
@ -1347,11 +1356,8 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
}
io_commit_cqring(ctx);
if (cqe) {
clear_bit(0, &ctx->sq_check_overflow);
clear_bit(0, &ctx->cq_check_overflow);
ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
}
io_cqring_mark_overflow(ctx);
spin_unlock_irqrestore(&ctx->completion_lock, flags);
io_cqring_ev_posted(ctx);
@ -7842,11 +7848,8 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
spin_lock_irq(&ctx->completion_lock);
list_del(&cancel_req->compl.list);
cancel_req->flags &= ~REQ_F_OVERFLOW;
if (list_empty(&ctx->cq_overflow_list)) {
clear_bit(0, &ctx->sq_check_overflow);
clear_bit(0, &ctx->cq_check_overflow);
ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
}
io_cqring_mark_overflow(ctx);
WRITE_ONCE(ctx->rings->cq_overflow,
atomic_inc_return(&ctx->cached_cq_overflow));
io_commit_cqring(ctx);