struct io_msg {
struct file *file;
+ struct file *src_file;
u64 user_data;
u32 len;
u32 cmd;
u32 flags;
};
-static int io_msg_ring_data(struct io_kiocb *req)
+static void io_double_unlock_ctx(struct io_ring_ctx *octx)
{
- struct io_ring_ctx *target_ctx = req->file->private_data;
- struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
-
- if (msg->src_fd || msg->dst_fd || msg->flags)
- return -EINVAL;
-
- if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
- return 0;
-
- return -EOVERFLOW;
-}
-
-static void io_double_unlock_ctx(struct io_ring_ctx *ctx,
- struct io_ring_ctx *octx,
- unsigned int issue_flags)
-{
- if (issue_flags & IO_URING_F_UNLOCKED)
- mutex_unlock(&ctx->uring_lock);
mutex_unlock(&octx->uring_lock);
}
-static int io_double_lock_ctx(struct io_ring_ctx *ctx,
- struct io_ring_ctx *octx,
+static int io_double_lock_ctx(struct io_ring_ctx *octx,
unsigned int issue_flags)
{
/*
return -EAGAIN;
return 0;
}
+ mutex_lock(&octx->uring_lock);
+ return 0;
+}
- /* Always grab smallest value ctx first. We know ctx != octx. */
- if (ctx < octx) {
- mutex_lock(&ctx->uring_lock);
- mutex_lock(&octx->uring_lock);
- } else {
- mutex_lock(&octx->uring_lock);
- mutex_lock(&ctx->uring_lock);
- }
+void io_msg_ring_cleanup(struct io_kiocb *req)
+{
+ struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
- return 0;
+ if (WARN_ON_ONCE(!msg->src_file))
+ return;
+
+ fput(msg->src_file);
+ msg->src_file = NULL;
}
-static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags)
+static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *target_ctx = req->file->private_data;
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
- struct io_ring_ctx *ctx = req->ctx;
- unsigned long file_ptr;
- struct file *src_file;
int ret;
- if (target_ctx == ctx)
+ if (msg->src_fd || msg->dst_fd || msg->flags)
return -EINVAL;
+ if (target_ctx->flags & IORING_SETUP_R_DISABLED)
+ return -EBADFD;
- ret = io_double_lock_ctx(ctx, target_ctx, issue_flags);
- if (unlikely(ret))
- return ret;
+ ret = -EOVERFLOW;
+ if (target_ctx->flags & IORING_SETUP_IOPOLL) {
+ if (unlikely(io_double_lock_ctx(target_ctx, issue_flags)))
+ return -EAGAIN;
+ if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
+ ret = 0;
+ io_double_unlock_ctx(target_ctx);
+ } else {
+ if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
+ ret = 0;
+ }
- ret = -EBADF;
- if (unlikely(msg->src_fd >= ctx->nr_user_files))
- goto out_unlock;
+ return ret;
+}
- msg->src_fd = array_index_nospec(msg->src_fd, ctx->nr_user_files);
- file_ptr = io_fixed_file_slot(&ctx->file_table, msg->src_fd)->file_ptr;
- if (!file_ptr)
- goto out_unlock;
+static struct file *io_msg_grab_file(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
+ struct io_ring_ctx *ctx = req->ctx;
+ struct file *file = NULL;
+ unsigned long file_ptr;
+ int idx = msg->src_fd;
+
+ io_ring_submit_lock(ctx, issue_flags);
+ if (likely(idx < ctx->nr_user_files)) {
+ idx = array_index_nospec(idx, ctx->nr_user_files);
+ file_ptr = io_fixed_file_slot(&ctx->file_table, idx)->file_ptr;
+ file = (struct file *) (file_ptr & FFS_MASK);
+ if (file)
+ get_file(file);
+ }
+ io_ring_submit_unlock(ctx, issue_flags);
+ return file;
+}
- src_file = (struct file *) (file_ptr & FFS_MASK);
- get_file(src_file);
+static int io_msg_install_complete(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_ring_ctx *target_ctx = req->file->private_data;
+ struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
+ struct file *src_file = msg->src_file;
+ int ret;
+
+ if (unlikely(io_double_lock_ctx(target_ctx, issue_flags)))
+ return -EAGAIN;
ret = __io_fixed_fd_install(target_ctx, src_file, msg->dst_fd);
- if (ret < 0) {
- fput(src_file);
+ if (ret < 0)
goto out_unlock;
- }
+
+ msg->src_file = NULL;
+ req->flags &= ~REQ_F_NEED_CLEANUP;
if (msg->flags & IORING_MSG_RING_CQE_SKIP)
goto out_unlock;
-
/*
* If this fails, the target still received the file descriptor but
* wasn't notified of the fact. This means that if this request
* completes with -EOVERFLOW, then the sender must ensure that a
* later IORING_OP_MSG_RING delivers the message.
*/
- if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
+ if (!io_post_aux_cqe(target_ctx, msg->user_data, ret, 0, true))
ret = -EOVERFLOW;
out_unlock:
- io_double_unlock_ctx(ctx, target_ctx, issue_flags);
+ io_double_unlock_ctx(target_ctx);
return ret;
}
+static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_ring_ctx *target_ctx = req->file->private_data;
+ struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
+ struct io_ring_ctx *ctx = req->ctx;
+ struct file *src_file = msg->src_file;
+
+ if (target_ctx == ctx)
+ return -EINVAL;
+ if (!src_file) {
+ src_file = io_msg_grab_file(req, issue_flags);
+ if (!src_file)
+ return -EBADF;
+ msg->src_file = src_file;
+ req->flags |= REQ_F_NEED_CLEANUP;
+ }
+ return io_msg_install_complete(req, issue_flags);
+}
+
int io_msg_ring_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
if (unlikely(sqe->buf_index || sqe->personality))
return -EINVAL;
+ msg->src_file = NULL;
msg->user_data = READ_ONCE(sqe->off);
msg->len = READ_ONCE(sqe->len);
msg->cmd = READ_ONCE(sqe->addr);
switch (msg->cmd) {
case IORING_MSG_DATA:
- ret = io_msg_ring_data(req);
+ ret = io_msg_ring_data(req, issue_flags);
break;
case IORING_MSG_SEND_FD:
ret = io_msg_send_fd(req, issue_flags);
}
done:
+ if (ret == -EAGAIN)
+ return -EAGAIN;
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, ret, 0);
- /* put file to avoid an attempt to IOPOLL the req */
- if (!(req->flags & REQ_F_FIXED_FILE))
- io_put_file(req->file);
- req->file = NULL;
return IOU_OK;
}
projects / platform / kernel / linux-starfive.git / blobdiff