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Subject[PATCH 2/3] f2fs: support passing down write hints to block layer with F2FS policy
Date
From: Hyunchul Lee <cheol.lee@lge.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@lge.com>
---
fs/f2fs/f2fs.h | 1 +
fs/f2fs/segment.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
fs/f2fs/super.c | 5 +++++
3 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d7c2797..898f37d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1038,6 +1038,7 @@ 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 8bc1fc1..b7cae61 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2491,6 +2491,32 @@ int rw_hint_to_seg_type(enum rw_hint hint)
*
* 2) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.
*
+ * 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,
@@ -2509,9 +2535,28 @@ enum rw_hint io_type_to_rw_hint(struct f2fs_sb_info *sbi,
} else {
return WRITE_LIFE_NOT_SET;
}
- } else {
- return WRITE_LIFE_NOT_SET;
+ } else if (sbi->whint_mode == WHINT_MODE_FS) {
+ if (type == DATA) {
+ switch (temp) {
+ case COLD:
+ return WRITE_LIFE_EXTREME;
+ case HOT:
+ return WRITE_LIFE_SHORT;
+ default:
+ return WRITE_LIFE_LONG;
+ }
+ } else if (type == NODE) {
+ switch (temp) {
+ case COLD:
+ return WRITE_LIFE_NONE;
+ default:
+ return WRITE_LIFE_NOT_SET;
+ }
+ } 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 9e22926..2115285 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;
@@ -1245,6 +1248,8 @@ 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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