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Update API

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- io_uring_sqe added a data field that's passed back at completion
- io_uring_sqe added an index field, for fixed buffer locations
- io_uring_setup(2) system call added a 'nr_iovecs' field

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-01-10 09:32:41 -07:00
parent 7bf7e8e8e5
commit 6cdce17753
6 changed files with 40 additions and 30 deletions
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30
test/io_uring-cp.c
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@@ -18,6 +18,11 @@ static struct io_uring in_ring;
static struct io_uring out_ring;
static struct iovec iovecs[QD];
struct io_data {
off_t offset;
struct iovec *iov;
};
static int setup_context(unsigned entries, struct io_uring *ring, int offload)
{
struct io_uring_params p;
@@ -27,7 +32,7 @@ static int setup_context(unsigned entries, struct io_uring *ring, int offload)
if (offload)
p.flags = IORING_SETUP_SQWQ;
ret = io_uring_queue_init(entries, &p, NULL, ring);
ret = io_uring_queue_init(entries, &p, NULL, 0, ring);
if (ret < 0) {
fprintf(stderr, "queue_init: %s\n", strerror(-ret));
return -1;
@@ -58,17 +63,23 @@ static unsigned sqe_index(struct io_uring_sqe *sqe)
static int queue_read(int fd, off_t size, off_t offset)
{
struct io_uring_sqe *sqe;
struct io_data *data;
sqe = io_uring_get_sqe(&in_ring);
if (!sqe)
return 1;
data = malloc(sizeof(*data));
data->offset = offset;
data->iov = &iovecs[sqe_index(sqe)];
sqe->opcode = IORING_OP_READV;
sqe->flags = 0;
sqe->ioprio = 0;
sqe->fd = fd;
sqe->off = offset;
sqe->addr = &iovecs[sqe_index(sqe)];
sqe->addr = data->iov;
sqe->data = (unsigned long) data;
iovecs[sqe_index(sqe)].iov_len = size;
sqe->len = 1;
return 0;
@@ -105,8 +116,9 @@ static int complete_writes(unsigned *writes)
return 0;
}
static void queue_write(int fd, off_t size, off_t offset, unsigned index)
static void queue_write(int fd, struct io_uring_cqe *cqe)
{
struct io_data *data = (struct io_data *) cqe->data;
struct io_uring_sqe *sqe;
sqe = io_uring_get_sqe(&out_ring);
@@ -114,10 +126,12 @@ static void queue_write(int fd, off_t size, off_t offset, unsigned index)
sqe->flags = 0;
sqe->ioprio = 0;
sqe->fd = fd;
sqe->off = offset;
sqe->addr = &iovecs[index];
iovecs[index].iov_len = size;
sqe->off = data->offset;
sqe->addr = data->iov;
sqe->data = 0;
data->iov->iov_len = cqe->res;
sqe->len = 1;
free(data);
}
int main(int argc, char *argv[])
@@ -164,7 +178,6 @@ int main(int argc, char *argv[])
write_left = read_left;
while (read_left || write_left) {
off_t this_size = read_left;
struct io_uring_sqe *sqe;
if (this_size > BS)
this_size = BS;
@@ -209,8 +222,7 @@ skip_read:
strerror(-cqe->res));
return 1;
}
sqe = io_uring_sqe_from_cqe(&in_ring, cqe);
queue_write(outfd, cqe->res, sqe->off, cqe->index);
queue_write(outfd, cqe);
write_left -= cqe->res;
writes++;
};