On 01/08, Chao Yu wrote:
> On 2020/1/8 20:04, Jaegeuk Kim wrote:
> > 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.
>
> One more question, why skipping 0x20 bit position?
It seems original patch missed to add comment.
>From f9447095de55a3cda1023a37a5e1cb6dd2f54ebb Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaeg...@kernel.org>
Date: Wed, 8 Jan 2020 15:10:02 -0800
Subject: [PATCH] f2fs: update f2fs document regarding to fsync_mode
This patch adds missing fsync_mode entry in f2fs document.
Fixes: 04485987f053 ("f2fs: introduce async IPU policy")
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
Documentation/filesystems/f2fs.txt | 3 ++-
fs/f2fs/segment.h | 5 +++--
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/Documentation/filesystems/f2fs.txt
b/Documentation/filesystems/f2fs.txt
index b80a7b69f210..ee61ace30276 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -334,7 +334,8 @@ Files in /sys/fs/f2fs/<devname>
updates in f2fs. User can set:
0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
0x04: F2FS_IPU_UTIL, 0x08: F2FS_IPU_SSR_UTIL,
- 0x10: F2FS_IPU_FSYNC, 0x40: F2FS_IPU_NOCACHE.
+ 0x10: F2FS_IPU_FSYNC, 0x20: F2FS_IPU_ASYNC,
+ 0x40: F2FS_IPU_NOCACHE.
Refer segment.h for details.
min_ipu_util This parameter controls the threshold to trigger
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 5e6cd8d8411d..459dc3901a57 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -607,9 +607,10 @@ static inline int utilization(struct f2fs_sb_info *sbi)
* threashold,
* F2FS_IPU_FSYNC - activated in fsync path only for high performance flash
* storages. IPU will be triggered only if the # of dirty
- * pages over min_fsync_blocks.
+ * pages over min_fsync_blocks. (=default option)
+ * F2FS_IPU_ASYNC - do IPU given by asynchronous write requests.
* F2FS_IPU_NOCACHE - disable IPU bio cache.
- * F2FS_IPUT_DISABLE - disable IPU. (=default option)
+ * F2FS_IPUT_DISABLE - disable IPU. (=default option in LFS mode)
*/
#define DEF_MIN_IPU_UTIL 70
#define DEF_MIN_FSYNC_BLOCKS 8
--
2.24.0.525.g8f36a354ae-goog
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