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f38f284764
Add the empty node initializing to the preinit part of the io_kiocb allocation, and reset them if they have been used. Signed-off-by: Jens Axboe <axboe@kernel.dk>
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IOU_RSRC_H
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#define IOU_RSRC_H
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#define IO_NODE_ALLOC_CACHE_MAX 32
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#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
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#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
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#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
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enum {
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IORING_RSRC_FILE = 0,
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IORING_RSRC_BUFFER = 1,
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};
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struct io_rsrc_data {
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unsigned int nr;
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struct io_rsrc_node **nodes;
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};
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struct io_rsrc_node {
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struct io_ring_ctx *ctx;
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int refs;
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u16 type;
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u64 tag;
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union {
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unsigned long file_ptr;
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struct io_mapped_ubuf *buf;
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};
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};
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struct io_mapped_ubuf {
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u64 ubuf;
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unsigned int len;
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unsigned int nr_bvecs;
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unsigned int folio_shift;
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refcount_t refs;
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unsigned long acct_pages;
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struct bio_vec bvec[] __counted_by(nr_bvecs);
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};
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struct io_imu_folio_data {
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/* Head folio can be partially included in the fixed buf */
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unsigned int nr_pages_head;
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/* For non-head/tail folios, has to be fully included */
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unsigned int nr_pages_mid;
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unsigned int folio_shift;
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};
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struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type);
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void io_free_rsrc_node(struct io_rsrc_node *node);
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int io_import_fixed(int ddir, struct iov_iter *iter,
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struct io_mapped_ubuf *imu,
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u64 buf_addr, size_t len);
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int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg);
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int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
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int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
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unsigned int nr_args, u64 __user *tags);
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int io_sqe_files_unregister(struct io_ring_ctx *ctx);
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int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
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unsigned nr_args, u64 __user *tags);
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int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
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unsigned nr_args);
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int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
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unsigned size, unsigned type);
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int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
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unsigned int size, unsigned int type);
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extern const struct io_rsrc_node empty_node;
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#define rsrc_empty_node (struct io_rsrc_node *) &empty_node
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static inline void io_put_rsrc_node(struct io_rsrc_node *node)
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{
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if (node != rsrc_empty_node && !--node->refs)
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io_free_rsrc_node(node);
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}
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static inline void io_req_put_rsrc_nodes(struct io_kiocb *req)
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{
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if (req->rsrc_nodes[IORING_RSRC_FILE] != rsrc_empty_node) {
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io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_FILE]);
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req->rsrc_nodes[IORING_RSRC_FILE] = rsrc_empty_node;
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}
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if (req->rsrc_nodes[IORING_RSRC_BUFFER] != rsrc_empty_node) {
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io_put_rsrc_node(req->rsrc_nodes[IORING_RSRC_BUFFER]);
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req->rsrc_nodes[IORING_RSRC_BUFFER] = rsrc_empty_node;
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}
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}
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static inline void io_req_assign_rsrc_node(struct io_kiocb *req,
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struct io_rsrc_node *node)
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{
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if (node != rsrc_empty_node) {
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node->refs++;
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req->rsrc_nodes[node->type] = node;
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}
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}
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int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
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int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
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static inline void __io_unaccount_mem(struct user_struct *user,
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unsigned long nr_pages)
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{
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atomic_long_sub(nr_pages, &user->locked_vm);
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}
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#endif
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