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f2fs: support passing down write hints to block layer with F2FS policy 

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>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Hyunchul Lee 2018-01-31 11:36:58 +09:00 committed by Jaegeuk Kim
parent 0cdd319539
commit f2e703f9a3
3 changed files with 54 additions and 9 deletions
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1
fs/f2fs/f2fs.h
View File

@ -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 {

57
fs/f2fs/segment.c
View File

@ -2489,6 +2489,32 @@ 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,
@ -2496,20 +2522,33 @@ 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)

5
fs/f2fs/super.c
View File

@ -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;
@ -1258,6 +1261,8 @@ 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;
}