1 // SPDX-License-Identifier: GPL-2.0
5 #include <net/af_unix.h>
7 #include "alloc_cache.h"
9 #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
10 #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
11 #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
15 IORING_RSRC_BUFFER = 1,
19 struct list_head list;
24 struct io_mapped_ubuf *buf;
28 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
31 struct io_ring_ctx *ctx;
36 struct completion done;
43 struct io_cache_entry cache;
44 struct io_rsrc_data *rsrc_data;
46 struct list_head node;
47 struct llist_node llist;
52 * Keeps a list of struct io_rsrc_put to be completed. Each entry
53 * represents one rsrc (e.g. file or buffer), but all of them should've
54 * came from the same table and so are of the same type.
56 struct list_head item_list;
57 struct io_rsrc_put item;
61 struct io_mapped_ubuf {
64 unsigned int nr_bvecs;
65 unsigned long acct_pages;
66 struct bio_vec bvec[];
69 void io_rsrc_put_tw(struct callback_head *cb);
70 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
71 void io_rsrc_put_work(struct work_struct *work);
72 void io_wait_rsrc_data(struct io_rsrc_data *data);
73 void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
74 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
75 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
76 struct io_rsrc_node *node, void *rsrc);
77 void io_rsrc_node_switch(struct io_ring_ctx *ctx,
78 struct io_rsrc_data *data_to_kill);
80 int io_import_fixed(int ddir, struct iov_iter *iter,
81 struct io_mapped_ubuf *imu,
82 u64 buf_addr, size_t len);
84 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
85 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
86 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
87 unsigned int nr_args, u64 __user *tags);
88 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
89 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
90 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
91 unsigned nr_args, u64 __user *tags);
93 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
95 #if defined(CONFIG_UNIX)
96 static inline bool io_file_need_scm(struct file *filp)
98 return !!unix_get_socket(filp);
101 static inline bool io_file_need_scm(struct file *filp)
107 static inline int io_scm_file_account(struct io_ring_ctx *ctx,
110 if (likely(!io_file_need_scm(file)))
112 return __io_scm_file_account(ctx, file);
115 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
117 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
118 unsigned size, unsigned type);
119 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
120 unsigned int size, unsigned int type);
122 static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
124 lockdep_assert_held(&ctx->uring_lock);
126 if (node && !--node->refs)
127 io_rsrc_node_ref_zero(node);
130 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
131 struct io_ring_ctx *ctx)
133 io_put_rsrc_node(ctx, req->rsrc_node);
136 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
137 struct io_rsrc_node *node)
142 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
143 struct io_ring_ctx *ctx,
144 unsigned int issue_flags)
146 if (!req->rsrc_node) {
147 io_ring_submit_lock(ctx, issue_flags);
149 lockdep_assert_held(&ctx->uring_lock);
151 req->rsrc_node = ctx->rsrc_node;
152 io_charge_rsrc_node(ctx, ctx->rsrc_node);
153 io_ring_submit_unlock(ctx, issue_flags);
157 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
159 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
160 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
162 return &data->tags[table_idx][off];
165 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
166 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
168 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
170 static inline void __io_unaccount_mem(struct user_struct *user,
171 unsigned long nr_pages)
173 atomic_long_sub(nr_pages, &user->locked_vm);