On 2020/1/7 10:07, Jaegeuk Kim wrote:
> Setting 0x40 in /sys/fs/f2fs/dev/ipu_policy gives a way to turn off
> bio cache, which is useufl to check whether block layer using hardware
> encryption engine merges IOs correctly.
>
> Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
> ---
> Documentation/filesystems/f2fs.txt | 1 +
> fs/f2fs/segment.c | 2 +-
> fs/f2fs/segment.h | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/filesystems/f2fs.txt
> b/Documentation/filesystems/f2fs.txt
> index 41b5aa94b30f..cd93bcc34726 100644
> --- a/Documentation/filesystems/f2fs.txt
> +++ b/Documentation/filesystems/f2fs.txt
> @@ -335,6 +335,7 @@ Files in /sys/fs/f2fs/<devname>
> 0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
> 0x04: F2FS_IPU_UTIL, 0x08: F2FS_IPU_SSR_UTIL,
> 0x10: F2FS_IPU_FSYNC.
. -> ,
Reviewed-by: Chao Yu <yuch...@huawei.com>
Thanks,
> + 0x40: F2FS_IPU_NOCACHE disables bio caches.
>
> min_ipu_util This parameter controls the threshold to
> trigger
> in-place-updates. The number indicates
> percentage
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index a9519532c029..311fe4937f6a 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3289,7 +3289,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
>
> stat_inc_inplace_blocks(fio->sbi);
>
> - if (fio->bio)
> + if (fio->bio && !(SM_I(sbi)->ipu_policy & (1 << F2FS_IPU_NOCACHE)))
> err = f2fs_merge_page_bio(fio);
> else
> err = f2fs_submit_page_bio(fio);
> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> index a1b3951367cd..02e620470eef 100644
> --- a/fs/f2fs/segment.h
> +++ b/fs/f2fs/segment.h
> @@ -623,6 +623,7 @@ enum {
> F2FS_IPU_SSR_UTIL,
> F2FS_IPU_FSYNC,
> F2FS_IPU_ASYNC,
> + F2FS_IPU_NOCACHE,
> };
>
> static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
>
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