146 lines
3.7 KiB
C
146 lines
3.7 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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#include <net/af_unix.h>
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#include "alloc_cache.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_put {
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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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u16 rsrc_type;
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bool quiesce;
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};
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struct io_rsrc_node {
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union {
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struct io_cache_entry cache;
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struct io_ring_ctx *ctx;
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};
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int refs;
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bool empty;
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u16 type;
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struct list_head node;
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struct io_rsrc_put item;
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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[] __counted_by(nr_bvecs);
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};
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void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
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void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
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struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
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int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
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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_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_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
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{
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lockdep_assert_held(&ctx->uring_lock);
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if (node && !--node->refs)
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io_rsrc_node_ref_zero(node);
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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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{
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io_put_rsrc_node(ctx, req->rsrc_node);
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}
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static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
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struct io_rsrc_node *node)
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{
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node->refs++;
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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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io_ring_submit_lock(ctx, issue_flags);
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lockdep_assert_held(&ctx->uring_lock);
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req->rsrc_node = ctx->rsrc_node;
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io_charge_rsrc_node(ctx, ctx->rsrc_node);
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io_ring_submit_unlock(ctx, issue_flags);
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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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static inline int io_rsrc_init(struct io_ring_ctx *ctx)
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{
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ctx->rsrc_node = io_rsrc_node_alloc(ctx);
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return ctx->rsrc_node ? 0 : -ENOMEM;
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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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