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177 lines
4.5 KiB
177 lines
4.5 KiB
// 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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#include <net/af_unix.h> |
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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_put { |
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struct list_head list; |
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u64 tag; |
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union { |
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void *rsrc; |
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struct file *file; |
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struct io_mapped_ubuf *buf; |
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}; |
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}; |
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typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
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struct io_rsrc_data { |
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struct io_ring_ctx *ctx; |
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u64 **tags; |
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unsigned int nr; |
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rsrc_put_fn *do_put; |
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atomic_t refs; |
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struct completion done; |
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bool quiesce; |
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}; |
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struct io_rsrc_node { |
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struct percpu_ref refs; |
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struct list_head node; |
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struct list_head rsrc_list; |
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struct io_rsrc_data *rsrc_data; |
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struct llist_node llist; |
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bool done; |
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}; |
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struct io_mapped_ubuf { |
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u64 ubuf; |
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u64 ubuf_end; |
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unsigned int nr_bvecs; |
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unsigned long acct_pages; |
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struct bio_vec bvec[]; |
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}; |
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void io_rsrc_put_work(struct work_struct *work); |
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void io_rsrc_refs_refill(struct io_ring_ctx *ctx); |
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void io_wait_rsrc_data(struct io_rsrc_data *data); |
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void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); |
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void io_rsrc_refs_drop(struct io_ring_ctx *ctx); |
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int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); |
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int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
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struct io_rsrc_node *node, void *rsrc); |
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void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
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struct io_rsrc_data *data_to_kill); |
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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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void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
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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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void __io_sqe_files_unregister(struct io_ring_ctx *ctx); |
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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_scm_file_account(struct io_ring_ctx *ctx, struct file *file); |
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#if defined(CONFIG_UNIX) |
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static inline bool io_file_need_scm(struct file *filp) |
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{ |
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return !!unix_get_socket(filp); |
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} |
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#else |
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static inline bool io_file_need_scm(struct file *filp) |
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{ |
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return false; |
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} |
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#endif |
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static inline int io_scm_file_account(struct io_ring_ctx *ctx, |
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struct file *file) |
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{ |
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if (likely(!io_file_need_scm(file))) |
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return 0; |
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return __io_scm_file_account(ctx, file); |
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} |
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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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static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr) |
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{ |
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percpu_ref_put_many(&node->refs, nr); |
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} |
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static inline void io_req_put_rsrc(struct io_kiocb *req) |
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{ |
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if (req->rsrc_node) |
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io_rsrc_put_node(req->rsrc_node, 1); |
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} |
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static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
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struct io_ring_ctx *ctx) |
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__must_hold(&ctx->uring_lock) |
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{ |
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struct io_rsrc_node *node = req->rsrc_node; |
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if (node) { |
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if (node == ctx->rsrc_node) |
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ctx->rsrc_cached_refs++; |
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else |
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io_rsrc_put_node(node, 1); |
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} |
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} |
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static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) |
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{ |
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ctx->rsrc_cached_refs--; |
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if (unlikely(ctx->rsrc_cached_refs < 0)) |
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io_rsrc_refs_refill(ctx); |
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} |
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static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
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struct io_ring_ctx *ctx, |
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unsigned int issue_flags) |
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{ |
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if (!req->rsrc_node) { |
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req->rsrc_node = ctx->rsrc_node; |
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if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
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lockdep_assert_held(&ctx->uring_lock); |
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io_charge_rsrc_node(ctx); |
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} else { |
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percpu_ref_get(&req->rsrc_node->refs); |
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} |
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} |
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} |
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static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
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{ |
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unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; |
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unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; |
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return &data->tags[table_idx][off]; |
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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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