Commit f2e703f9 authored by Hyunchul Lee's avatar Hyunchul Lee Committed by Jaegeuk Kim
Browse files

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: default avatarHyunchul Lee <cheol.lee@lge.com>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 0cdd3195

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

fs/f2fs/segment.c

+48 −9
Original line number Diff line number Diff line
@@ -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,
@@ -2496,21 +2522,34 @@ 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 {

	} 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)

{

fs/f2fs/super.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}

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