xref: /linux/io_uring/filetable.h (revision b50ecc5aca4d18f1f0c4942f5c797bc85edef144)
1 // SPDX-License-Identifier: GPL-2.0
2 #ifndef IOU_FILE_TABLE_H
3 #define IOU_FILE_TABLE_H
4 
5 #include <linux/file.h>
6 #include <linux/io_uring_types.h>
7 #include "rsrc.h"
8 
9 bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
10 void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);
11 
12 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
13 			struct file *file, unsigned int file_slot);
14 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
15 				unsigned int file_slot);
16 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
17 
18 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
19 				 struct io_uring_file_index_range __user *arg);
20 
21 io_req_flags_t io_file_get_flags(struct file *file);
22 
23 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
24 {
25 	WARN_ON_ONCE(!test_bit(bit, table->bitmap));
26 	__clear_bit(bit, table->bitmap);
27 	table->alloc_hint = bit;
28 }
29 
30 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
31 {
32 	WARN_ON_ONCE(test_bit(bit, table->bitmap));
33 	__set_bit(bit, table->bitmap);
34 	table->alloc_hint = bit + 1;
35 }
36 
37 #define FFS_NOWAIT		0x1UL
38 #define FFS_ISREG		0x2UL
39 #define FFS_MASK		~(FFS_NOWAIT|FFS_ISREG)
40 
41 static inline unsigned int io_slot_flags(struct io_rsrc_node *node)
42 {
43 
44 	return (node->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
45 }
46 
47 static inline struct file *io_slot_file(struct io_rsrc_node *node)
48 {
49 	return (struct file *)(node->file_ptr & FFS_MASK);
50 }
51 
52 static inline void io_fixed_file_set(struct io_rsrc_node *node,
53 				     struct file *file)
54 {
55 	node->file_ptr = (unsigned long)file |
56 		(io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
57 }
58 
59 static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
60 						 unsigned off, unsigned len)
61 {
62 	ctx->file_alloc_start = off;
63 	ctx->file_alloc_end = off + len;
64 	ctx->file_table.alloc_hint = ctx->file_alloc_start;
65 }
66 
67 #endif
68