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0d98c50908
`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>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IOU_FILE_TABLE_H
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#define IOU_FILE_TABLE_H
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#include <linux/file.h>
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#include <linux/io_uring_types.h>
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#include "rsrc.h"
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bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
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void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);
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int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
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struct file *file, unsigned int file_slot);
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int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
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unsigned int file_slot);
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int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
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int io_register_file_alloc_range(struct io_ring_ctx *ctx,
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struct io_uring_file_index_range __user *arg);
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io_req_flags_t io_file_get_flags(struct file *file);
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static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
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{
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WARN_ON_ONCE(!test_bit(bit, table->bitmap));
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__clear_bit(bit, table->bitmap);
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table->alloc_hint = bit;
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}
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static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
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{
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WARN_ON_ONCE(test_bit(bit, table->bitmap));
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__set_bit(bit, table->bitmap);
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table->alloc_hint = bit + 1;
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}
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#define FFS_NOWAIT 0x1UL
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#define FFS_ISREG 0x2UL
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#define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG)
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static inline unsigned int io_slot_flags(struct io_rsrc_node *node)
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{
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return (node->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
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}
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static inline struct file *io_slot_file(struct io_rsrc_node *node)
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{
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return (struct file *)(node->file_ptr & FFS_MASK);
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}
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static inline void io_fixed_file_set(struct io_rsrc_node *node,
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struct file *file)
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{
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node->file_ptr = (unsigned long)file |
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(io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
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}
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static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
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unsigned off, unsigned len)
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{
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ctx->file_alloc_start = off;
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ctx->file_alloc_end = off + len;
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ctx->file_table.alloc_hint = ctx->file_alloc_start;
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}
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#endif
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