| // SPDX-License-Identifier: GPL-2.0 |
| #ifndef IOU_RSRC_H |
| #define IOU_RSRC_H |
| |
| #include <net/af_unix.h> |
| |
| #include "alloc_cache.h" |
| |
| #define IO_NODE_ALLOC_CACHE_MAX 32 |
| |
| #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
| #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
| #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) |
| |
| enum { |
| IORING_RSRC_FILE = 0, |
| IORING_RSRC_BUFFER = 1, |
| }; |
| |
| struct io_rsrc_put { |
| u64 tag; |
| union { |
| void *rsrc; |
| struct file *file; |
| struct io_mapped_ubuf *buf; |
| }; |
| }; |
| |
| typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
| |
| struct io_rsrc_data { |
| struct io_ring_ctx *ctx; |
| |
| u64 **tags; |
| unsigned int nr; |
| u16 rsrc_type; |
| bool quiesce; |
| }; |
| |
| struct io_rsrc_node { |
| union { |
| struct io_cache_entry cache; |
| struct io_ring_ctx *ctx; |
| }; |
| int refs; |
| bool empty; |
| u16 type; |
| struct list_head node; |
| struct io_rsrc_put item; |
| }; |
| |
| struct io_mapped_ubuf { |
| u64 ubuf; |
| u64 ubuf_end; |
| unsigned int nr_bvecs; |
| unsigned long acct_pages; |
| struct bio_vec bvec[] __counted_by(nr_bvecs); |
| }; |
| |
| void io_rsrc_node_ref_zero(struct io_rsrc_node *node); |
| void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node); |
| struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); |
| int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc); |
| |
| int io_import_fixed(int ddir, struct iov_iter *iter, |
| struct io_mapped_ubuf *imu, |
| u64 buf_addr, size_t len); |
| |
| void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
| int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
| int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
| unsigned int nr_args, u64 __user *tags); |
| void __io_sqe_files_unregister(struct io_ring_ctx *ctx); |
| int io_sqe_files_unregister(struct io_ring_ctx *ctx); |
| int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
| unsigned nr_args, u64 __user *tags); |
| |
| int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
| unsigned nr_args); |
| int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, |
| unsigned size, unsigned type); |
| int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
| unsigned int size, unsigned int type); |
| |
| static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node) |
| { |
| lockdep_assert_held(&ctx->uring_lock); |
| |
| if (node && !--node->refs) |
| io_rsrc_node_ref_zero(node); |
| } |
| |
| static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
| struct io_ring_ctx *ctx) |
| { |
| io_put_rsrc_node(ctx, req->rsrc_node); |
| } |
| |
| static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx, |
| struct io_rsrc_node *node) |
| { |
| node->refs++; |
| } |
| |
| static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
| struct io_ring_ctx *ctx, |
| unsigned int issue_flags) |
| { |
| if (!req->rsrc_node) { |
| io_ring_submit_lock(ctx, issue_flags); |
| |
| lockdep_assert_held(&ctx->uring_lock); |
| |
| req->rsrc_node = ctx->rsrc_node; |
| io_charge_rsrc_node(ctx, ctx->rsrc_node); |
| io_ring_submit_unlock(ctx, issue_flags); |
| } |
| } |
| |
| static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
| { |
| unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; |
| unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; |
| |
| return &data->tags[table_idx][off]; |
| } |
| |
| static inline int io_rsrc_init(struct io_ring_ctx *ctx) |
| { |
| ctx->rsrc_node = io_rsrc_node_alloc(ctx); |
| return ctx->rsrc_node ? 0 : -ENOMEM; |
| } |
| |
| int io_files_update(struct io_kiocb *req, unsigned int issue_flags); |
| int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); |
| |
| int __io_account_mem(struct user_struct *user, unsigned long nr_pages); |
| |
| static inline void __io_unaccount_mem(struct user_struct *user, |
| unsigned long nr_pages) |
| { |
| atomic_long_sub(nr_pages, &user->locked_vm); |
| } |
| |
| #endif |