| // SPDX-License-Identifier: GPL-2.0 |
| #ifndef IOU_RSRC_H |
| #define IOU_RSRC_H |
| |
| #include <net/af_unix.h> |
| |
| #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 { |
| struct list_head list; |
| 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; |
| rsrc_put_fn *do_put; |
| atomic_t refs; |
| struct completion done; |
| bool quiesce; |
| }; |
| |
| struct io_rsrc_node { |
| struct percpu_ref refs; |
| struct list_head node; |
| struct list_head rsrc_list; |
| struct io_rsrc_data *rsrc_data; |
| struct llist_node llist; |
| bool done; |
| }; |
| |
| struct io_mapped_ubuf { |
| u64 ubuf; |
| u64 ubuf_end; |
| unsigned int nr_bvecs; |
| unsigned long acct_pages; |
| struct bio_vec bvec[]; |
| }; |
| |
| void io_rsrc_put_work(struct work_struct *work); |
| void io_rsrc_refs_refill(struct io_ring_ctx *ctx); |
| void io_wait_rsrc_data(struct io_rsrc_data *data); |
| void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); |
| void io_rsrc_refs_drop(struct io_ring_ctx *ctx); |
| int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); |
| int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
| struct io_rsrc_node *node, void *rsrc); |
| void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
| struct io_rsrc_data *data_to_kill); |
| |
| 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_scm_file_account(struct io_ring_ctx *ctx, struct file *file); |
| |
| #if defined(CONFIG_UNIX) |
| static inline bool io_file_need_scm(struct file *filp) |
| { |
| return !!unix_get_socket(filp); |
| } |
| #else |
| static inline bool io_file_need_scm(struct file *filp) |
| { |
| return false; |
| } |
| #endif |
| |
| static inline int io_scm_file_account(struct io_ring_ctx *ctx, |
| struct file *file) |
| { |
| if (likely(!io_file_need_scm(file))) |
| return 0; |
| return __io_scm_file_account(ctx, file); |
| } |
| |
| 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_rsrc_put_node(struct io_rsrc_node *node, int nr) |
| { |
| percpu_ref_put_many(&node->refs, nr); |
| } |
| |
| static inline void io_req_put_rsrc(struct io_kiocb *req) |
| { |
| if (req->rsrc_node) |
| io_rsrc_put_node(req->rsrc_node, 1); |
| } |
| |
| static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
| struct io_ring_ctx *ctx) |
| __must_hold(&ctx->uring_lock) |
| { |
| struct io_rsrc_node *node = req->rsrc_node; |
| |
| if (node) { |
| if (node == ctx->rsrc_node) |
| ctx->rsrc_cached_refs++; |
| else |
| io_rsrc_put_node(node, 1); |
| } |
| } |
| |
| static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) |
| { |
| ctx->rsrc_cached_refs--; |
| if (unlikely(ctx->rsrc_cached_refs < 0)) |
| io_rsrc_refs_refill(ctx); |
| } |
| |
| 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); |
| 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]; |
| } |
| |
| 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 |