On 01/08, Chao Yu wrote:
> 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.
>
> . -> ,
Actually, we can't do it. I revised it a bit instead.
>
> 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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