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| author | Bart Van Assche <bvanassche@acm.org> | 2024-02-02 23:39:23 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-06 16:30:48 +0300 |
| commit | fe3944fb245ab99570552a3bf970b00058a9ca6d (patch) | |
| tree | 6fc80c8d7fd39ce5dd3345f735bfe647ed486fbc /include/linux/rw_hint.h | |
| parent | 1505ba06e52e701600172bccbc3aa7fb9bd5d0da (diff) | |
| download | linux-fe3944fb245ab99570552a3bf970b00058a9ca6d.tar.xz | |
fs: Move enum rw_hint into a new header file
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>
Diffstat (limited to 'include/linux/rw_hint.h')
| -rw-r--r-- | include/linux/rw_hint.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/rw_hint.h b/include/linux/rw_hint.h new file mode 100644 index 000000000000..309ca72f2dfb --- /dev/null +++ b/include/linux/rw_hint.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_RW_HINT_H +#define _LINUX_RW_HINT_H + +#include <linux/build_bug.h> +#include <linux/compiler_attributes.h> +#include <uapi/linux/fcntl.h> + +/* Block storage write lifetime hint values. */ +enum rw_hint { + WRITE_LIFE_NOT_SET = RWH_WRITE_LIFE_NOT_SET, + WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, + WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, + WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, + WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, + WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, +} __packed; + +/* Sparse ignores __packed annotations on enums, hence the #ifndef below. */ +#ifndef __CHECKER__ +static_assert(sizeof(enum rw_hint) == 1); +#endif + +#endif /* _LINUX_RW_HINT_H */ |