59 lines
1.5 KiB
C
59 lines
1.5 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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struct io_ring_ctx;
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/*
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* FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0
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* and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we
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* can't safely always dereference the file when the task has exited and ring
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* cleanup is done. If a file is tracked and part of SCM, then unix gc on
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* process exit may reap it before __io_sqe_files_unregister() is run.
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*/
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#define FFS_NOWAIT 0x1UL
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#define FFS_ISREG 0x2UL
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#if defined(CONFIG_64BIT)
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#define FFS_SCM 0x4UL
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#else
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#define IO_URING_SCM_ALL
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#define FFS_SCM 0x0UL
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#endif
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#define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM)
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struct io_fixed_file {
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/* file * with additional FFS_* flags */
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unsigned long file_ptr;
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};
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struct io_file_table {
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struct io_fixed_file *files;
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unsigned long *bitmap;
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unsigned int alloc_hint;
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};
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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_file_bitmap_get(struct io_ring_ctx *ctx);
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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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__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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#endif
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