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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4bcb982cce
We're out of space here, and none of the flags are easily reclaimable. Bump it to 64-bits and re-arrange the struct a bit to avoid gaps. Add a specific bitwise type for the request flags, io_request_flags_t. This will help catch violations of casting this value to a smaller type on 32-bit archs, like unsigned int. This creates a hole in the io_kiocb, so move nr_tw up and rsrc_node down to retain needing only cacheline 0 and 1 for non-polled opcodes. No functional changes intended in this patch. Signed-off-by: Jens Axboe <axboe@kernel.dk>
82 lines
2.2 KiB
C
82 lines
2.2 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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bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
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void io_free_file_tables(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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static inline struct io_fixed_file *
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io_fixed_file_slot(struct io_file_table *table, unsigned i)
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{
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return &table->files[i];
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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_fixed_file *slot)
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{
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return (slot->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_fixed_file *slot)
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{
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return (struct file *)(slot->file_ptr & FFS_MASK);
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}
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static inline struct file *io_file_from_index(struct io_file_table *table,
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int index)
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{
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return io_slot_file(io_fixed_file_slot(table, index));
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}
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static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
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struct file *file)
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{
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file_slot->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_reset_alloc_hint(struct io_ring_ctx *ctx)
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{
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ctx->file_table.alloc_hint = ctx->file_alloc_start;
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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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io_reset_alloc_hint(ctx);
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}
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#endif
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