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88 lines
2.5 KiB
88 lines
2.5 KiB
// 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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/* |
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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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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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unsigned int 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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__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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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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struct io_fixed_file *slot = io_fixed_file_slot(table, index); |
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return (struct file *) (slot->file_ptr & FFS_MASK); |
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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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unsigned long file_ptr = (unsigned long) file; |
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file_ptr |= io_file_get_flags(file); |
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file_slot->file_ptr = file_ptr; |
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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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