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io_uring/rsrc: get rid of the empty node and dummy_ubuf

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The empty node was used as a placeholder for a sparse entry, but it
didn't really solve any issues. The caller still has to check for
whether it's the empty node or not, it may as well just check for a NULL
return instead.

The dummy_ubuf was used for a sparse buffer entry, but NULL will serve
the same purpose there of ensuring an -EFAULT on attempted import.

Just use NULL for a sparse node, regardless of whether or not it's a
file or buffer resource.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2024-10-30 09:51:58 -06:00
parent 4007c3d8c2
commit d50f94d761
6 changed files with 40 additions and 50 deletions
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23
io_uring/rsrc.h
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@@ -67,9 +67,6 @@ int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
unsigned int size, unsigned int type);
extern const struct io_rsrc_node empty_node;
#define rsrc_empty_node (struct io_rsrc_node *) &empty_node
static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data,
int index)
{
@@ -80,7 +77,7 @@ static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data
static inline void io_put_rsrc_node(struct io_rsrc_node *node)
{
if (node != rsrc_empty_node && !--node->refs)
if (node && !--node->refs)
io_free_rsrc_node(node);
}
@@ -97,23 +94,17 @@ static inline bool io_reset_rsrc_node(struct io_rsrc_data *data, int index)
static inline void io_req_put_rsrc_nodes(struct io_kiocb *req)
{
if (req->rsrc_nodes[IORING_RSRC_FILE] != rsrc_empty_node) {
io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_FILE]);
req->rsrc_nodes[IORING_RSRC_FILE] = rsrc_empty_node;
}
if (req->rsrc_nodes[IORING_RSRC_BUFFER] != rsrc_empty_node) {
io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_BUFFER]);
req->rsrc_nodes[IORING_RSRC_BUFFER] = rsrc_empty_node;
}
io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_FILE]);
io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_BUFFER]);
req->rsrc_nodes[IORING_RSRC_FILE] = NULL;
req->rsrc_nodes[IORING_RSRC_BUFFER] = NULL;
}
static inline void io_req_assign_rsrc_node(struct io_kiocb *req,
struct io_rsrc_node *node)
{
if (node != rsrc_empty_node) {
node->refs++;
req->rsrc_nodes[node->type] = node;
}
node->refs++;
req->rsrc_nodes[node->type] = node;
}
int io_files_update(struct io_kiocb *req, unsigned int issue_flags);