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Date: Wed, 31 Jan 2018 11:36:58 +0900
From: Hyunchul Lee <hyc.lee@...il.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
kernel-team@....com, Hyunchul Lee <cheol.lee@....com>
Subject: [PATCH v2 2/3] f2fs: support passing down write hints to block layer with F2FS policy
From: Hyunchul Lee <cheol.lee@....com>
Add 'whint_mode=fs-based' mount option. In this mode, F2FS passes
down write hints with its policy.
* whint_mode=fs-based. F2FS passes down hints with its policy.
User F2FS Block
---- ---- -----
META WRITE_LIFE_MEDIUM;
HOT_NODE WRITE_LIFE_NOT_SET
WARM_NODE "
COLD_NODE WRITE_LIFE_NONE
ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
extension list " "
-- buffered io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_LONG
WRITE_LIFE_NONE " "
WRITE_LIFE_MEDIUM " "
WRITE_LIFE_LONG " "
-- direct io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE " WRITE_LIFE_NONE
WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
WRITE_LIFE_LONG " WRITE_LIFE_LONG
Many thanks to Chao Yu and Jaegeuk Kim for comments to
implement this patch.
Signed-off-by: Hyunchul Lee <cheol.lee@....com>
---
v2:
- Change "case" statements to "if" statements in rw_hint_to_seg_type()
fs/f2fs/f2fs.h | 1 +
fs/f2fs/segment.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++---------
fs/f2fs/super.c | 5 +++++
3 files changed, 54 insertions(+), 9 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 475637d..8273bc7 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1040,6 +1040,7 @@ enum {
enum {
WHINT_MODE_OFF, /* not pass down write hints */
WHINT_MODE_USER, /* try to pass down hints given by users */
+ WHINT_MODE_FS, /* pass down hints with F2FS policy */
};
struct f2fs_sb_info {
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 840c8ff..733a733 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2488,6 +2488,32 @@ int rw_hint_to_seg_type(enum rw_hint hint)
* WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
* WRITE_LIFE_LONG " WRITE_LIFE_LONG
*
+ * 3) whint_mode=fs-based. F2FS passes down hints with its policy.
+ *
+ * User F2FS Block
+ * ---- ---- -----
+ * META WRITE_LIFE_MEDIUM;
+ * HOT_NODE WRITE_LIFE_NOT_SET
+ * WARM_NODE "
+ * COLD_NODE WRITE_LIFE_NONE
+ * ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
+ * extension list " "
+ *
+ * -- buffered io
+ * WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
+ * WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
+ * WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_LONG
+ * WRITE_LIFE_NONE " "
+ * WRITE_LIFE_MEDIUM " "
+ * WRITE_LIFE_LONG " "
+ *
+ * -- direct io
+ * WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
+ * WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
+ * WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
+ * WRITE_LIFE_NONE " WRITE_LIFE_NONE
+ * WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
+ * WRITE_LIFE_LONG " WRITE_LIFE_LONG
*/
enum rw_hint io_type_to_rw_hint(struct f2fs_sb_info *sbi,
@@ -2495,20 +2521,33 @@ enum rw_hint io_type_to_rw_hint(struct f2fs_sb_info *sbi,
{
if (sbi->whint_mode == WHINT_MODE_USER) {
if (type == DATA) {
- switch (temp) {
- case COLD:
- return WRITE_LIFE_EXTREME;
- case HOT:
- return WRITE_LIFE_SHORT;
- default:
+ if (temp == WARM)
return WRITE_LIFE_NOT_SET;
- }
+ else if (temp == HOT)
+ return WRITE_LIFE_SHORT;
+ else if (temp == COLD)
+ return WRITE_LIFE_EXTREME;
} else {
return WRITE_LIFE_NOT_SET;
}
- } else {
- return WRITE_LIFE_NOT_SET;
+ } else if (sbi->whint_mode == WHINT_MODE_FS) {
+ if (type == DATA) {
+ if (temp == WARM)
+ return WRITE_LIFE_LONG;
+ else if (temp == HOT)
+ return WRITE_LIFE_SHORT;
+ else if (temp == COLD)
+ return WRITE_LIFE_EXTREME;
+ } else if (type == NODE) {
+ if (temp == WARM || temp == HOT)
+ return WRITE_LIFE_NOT_SET;
+ else if (temp == COLD)
+ return WRITE_LIFE_NONE;
+ } else if (type == META) {
+ return WRITE_LIFE_MEDIUM;
+ }
}
+ return WRITE_LIFE_NOT_SET;
}
static int __get_segment_type_2(struct f2fs_io_info *fio)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 139547d..bd013ff 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -691,6 +691,9 @@ static int parse_options(struct super_block *sb, char *options)
} else if (strlen(name) == 3 &&
!strncmp(name, "off", 3)) {
sbi->whint_mode = WHINT_MODE_OFF;
+ } else if (strlen(name) == 8 &&
+ !strncmp(name, "fs-based", 8)) {
+ sbi->whint_mode = WHINT_MODE_FS;
} else {
kfree(name);
return -EINVAL;
@@ -1251,6 +1254,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
f2fs_show_quota_options(seq, sbi->sb);
if (sbi->whint_mode == WHINT_MODE_USER)
seq_printf(seq, ",whint_mode=%s", "user-based");
+ else if (sbi->whint_mode == WHINT_MODE_FS)
+ seq_printf(seq, ",whint_mode=%s", "fs-based");
return 0;
}
--
1.9.1
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