1 // SPDX-License-Identifier: GPL-2.0
5 #include <net/af_unix.h>
7 #include "alloc_cache.h"
9 #define IO_NODE_ALLOC_CACHE_MAX 32
11 #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
12 #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
13 #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
17 IORING_RSRC_BUFFER = 1,
25 struct io_mapped_ubuf *buf;
29 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
32 struct io_ring_ctx *ctx;
42 struct io_cache_entry cache;
43 struct io_ring_ctx *ctx;
48 struct list_head node;
49 struct io_rsrc_put item;
52 struct io_mapped_ubuf {
55 unsigned int nr_bvecs;
56 unsigned long acct_pages;
57 struct bio_vec bvec[];
60 void io_rsrc_put_tw(struct callback_head *cb);
61 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
62 void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
63 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
64 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
66 int io_import_fixed(int ddir, struct iov_iter *iter,
67 struct io_mapped_ubuf *imu,
68 u64 buf_addr, size_t len);
70 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
71 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
72 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
73 unsigned int nr_args, u64 __user *tags);
74 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
75 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
76 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
77 unsigned nr_args, u64 __user *tags);
79 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
81 #if defined(CONFIG_UNIX)
82 static inline bool io_file_need_scm(struct file *filp)
84 return !!unix_get_socket(filp);
87 static inline bool io_file_need_scm(struct file *filp)
93 static inline int io_scm_file_account(struct io_ring_ctx *ctx,
96 if (likely(!io_file_need_scm(file)))
98 return __io_scm_file_account(ctx, file);
101 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
103 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
104 unsigned size, unsigned type);
105 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
106 unsigned int size, unsigned int type);
108 static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
110 lockdep_assert_held(&ctx->uring_lock);
112 if (node && !--node->refs)
113 io_rsrc_node_ref_zero(node);
116 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
117 struct io_ring_ctx *ctx)
119 io_put_rsrc_node(ctx, req->rsrc_node);
122 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
123 struct io_rsrc_node *node)
128 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
129 struct io_ring_ctx *ctx,
130 unsigned int issue_flags)
132 if (!req->rsrc_node) {
133 io_ring_submit_lock(ctx, issue_flags);
135 lockdep_assert_held(&ctx->uring_lock);
137 req->rsrc_node = ctx->rsrc_node;
138 io_charge_rsrc_node(ctx, ctx->rsrc_node);
139 io_ring_submit_unlock(ctx, issue_flags);
143 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
145 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
146 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
148 return &data->tags[table_idx][off];
151 static inline int io_rsrc_init(struct io_ring_ctx *ctx)
153 ctx->rsrc_node = io_rsrc_node_alloc(ctx);
154 return ctx->rsrc_node ? 0 : -ENOMEM;
157 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
158 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
160 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
162 static inline void __io_unaccount_mem(struct user_struct *user,
163 unsigned long nr_pages)
165 atomic_long_sub(nr_pages, &user->locked_vm);