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linux/io_uring/filetable.h
Ming Lei 0d98c50908 io_uring/rsrc: pass 'struct io_ring_ctx' reference to rsrc helpers
`io_rsrc_node` instance won't be shared among different io_uring ctxs,
and its allocation 'ctx' is always same with the user's 'ctx', so it is
safe to pass user 'ctx' reference to rsrc helpers. Even in io_clone_buffers(),
`io_rsrc_node` instance is allocated actually for destination io_uring_ctx.

Then io_rsrc_node_ctx() can be removed, and the 8 bytes `ctx` pointer will be
removed from `io_rsrc_node` in the following patch.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241107110149.890530-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-11-07 15:24:33 -07:00

68 lines
1.9 KiB
C

// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_FILE_TABLE_H
#define IOU_FILE_TABLE_H
#include <linux/file.h>
#include <linux/io_uring_types.h>
#include "rsrc.h"
bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);
int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
struct file *file, unsigned int file_slot);
int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
unsigned int file_slot);
int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
int io_register_file_alloc_range(struct io_ring_ctx *ctx,
struct io_uring_file_index_range __user *arg);
io_req_flags_t io_file_get_flags(struct file *file);
static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
{
WARN_ON_ONCE(!test_bit(bit, table->bitmap));
__clear_bit(bit, table->bitmap);
table->alloc_hint = bit;
}
static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
{
WARN_ON_ONCE(test_bit(bit, table->bitmap));
__set_bit(bit, table->bitmap);
table->alloc_hint = bit + 1;
}
#define FFS_NOWAIT 0x1UL
#define FFS_ISREG 0x2UL
#define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG)
static inline unsigned int io_slot_flags(struct io_rsrc_node *node)
{
return (node->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
}
static inline struct file *io_slot_file(struct io_rsrc_node *node)
{
return (struct file *)(node->file_ptr & FFS_MASK);
}
static inline void io_fixed_file_set(struct io_rsrc_node *node,
struct file *file)
{
node->file_ptr = (unsigned long)file |
(io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
}
static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
unsigned off, unsigned len)
{
ctx->file_alloc_start = off;
ctx->file_alloc_end = off + len;
ctx->file_table.alloc_hint = ctx->file_alloc_start;
}
#endif