forked from mirrors/linux
fe3944fb24
Move enum rw_hint into a new header file to prepare for using this data type in the block layer. Add the attribute __packed to reduce the space occupied by instances of this data type from four bytes to one byte. Change the data type of i_write_hint from u8 into enum rw_hint. Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Chao Yu <chao@kernel.org> # for the F2FS part Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20240202203926.2478590-5-bvanassche@acm.org Signed-off-by: Christian Brauner <brauner@kernel.org>
24 lines
702 B
C
24 lines
702 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_RW_HINT_H
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#define _LINUX_RW_HINT_H
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#include <linux/build_bug.h>
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#include <linux/compiler_attributes.h>
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#include <uapi/linux/fcntl.h>
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/* Block storage write lifetime hint values. */
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enum rw_hint {
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WRITE_LIFE_NOT_SET = RWH_WRITE_LIFE_NOT_SET,
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WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE,
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WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT,
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WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM,
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WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG,
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WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME,
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} __packed;
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/* Sparse ignores __packed annotations on enums, hence the #ifndef below. */
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#ifndef __CHECKER__
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static_assert(sizeof(enum rw_hint) == 1);
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#endif
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#endif /* _LINUX_RW_HINT_H */
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