linux-kernel - [PATCH] f2fs:Add write priority option based on zone UFS

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Date: Tue,  2 Jul 2024 14:29:52 +0800
From: Liao Yuanhong <liaoyuanhong@...o.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>,
	Chao Yu <chao@...nel.org>
Cc: bo.wu@...o.com,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Liao Yuanhong <liaoyuanhong@...o.com>
Subject: [PATCH] f2fs:Add write priority option based on zone UFS

Currently, we are using a mix of traditional UFS and zone UFS to support 
some functionalities that cannot be achieved on zone UFS alone. However, 
there are some issues with this approach. There exists a significant 
performance difference between traditional UFS and zone UFS. Under normal 
usage, we prioritize writes to zone UFS. However, in critical conditions 
(such as when the entire UFS is almost full), we cannot determine whether 
data will be written to traditional UFS or zone UFS. This can lead to 
significant performance fluctuations, which is not conducive to 
development and testing. To address this, we have added an option 
zlu_io_enable under sys with the following three modes:
1) zlu_io_enable == 0:Normal mode, prioritize writing to zone UFS;
2) zlu_io_enable == 1:Zone UFS only mode, only allow writing to zone UFS;
3) zlu_io_enable == 2:Traditional UFS priority mode, prioritize writing to 
traditional UFS.

Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>
Signed-off-by: Wu Bo <bo.wu@...o.com>
---
 fs/f2fs/f2fs.h    |  5 +++++
 fs/f2fs/segment.c | 23 ++++++++++++++++++++++-
 fs/f2fs/sysfs.c   | 13 +++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f7ee6c5e371e..7ba782bd15b2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1781,6 +1781,11 @@ struct f2fs_sb_info {
 	u64 committed_atomic_block;
 	u64 revoked_atomic_block;
 
+#ifdef CONFIG_BLK_DEV_ZONED
+	/* For adjust the priority writing position of data in zone UFS */
+	unsigned int zlu_io_enable;		/* data write mode */
+#endif
+
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	struct kmem_cache *page_array_slab;	/* page array entry */
 	unsigned int page_array_slab_size;	/* default page array slab size */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 4db1add43e36..327457c28700 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2686,17 +2686,38 @@ static int get_new_segment(struct f2fs_sb_info *sbi,
 			goto got_it;
 	}
 
+#ifdef CONFIG_BLK_DEV_ZONED
 	/*
 	 * If we format f2fs on zoned storage, let's try to get pinned sections
 	 * from beginning of the storage, which should be a conventional one.
 	 */
 	if (f2fs_sb_has_blkzoned(sbi)) {
-		segno = pinning ? 0 : max(first_zoned_segno(sbi), *newseg);
+		if (sbi->zlu_io_enable == 2)		/* Prioritize writing to traditional UFS */
+			segno = 0;
+		else
+			segno = pinning ? 0 : max(first_zoned_segno(sbi), *newseg);
 		hint = GET_SEC_FROM_SEG(sbi, segno);
 	}
+#endif
 
 find_other_zone:
 	secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
+
+#ifdef CONFIG_BLK_DEV_ZONED
+	if (secno >= MAIN_SECS(sbi) && f2fs_sb_has_blkzoned(sbi)) {
+		if (sbi->zlu_io_enable == 1) {		/* Write only to zone UFS */
+			hint = GET_SEC_FROM_SEG(sbi, first_zoned_segno(sbi));
+			secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
+		} else
+			secno = find_first_zero_bit(free_i->free_secmap,
+								MAIN_SECS(sbi));
+		if (secno >= MAIN_SECS(sbi)) {
+			ret = -ENOSPC;
+			goto out_unlock;
+		}
+	}
+#endif
+
 	if (secno >= MAIN_SECS(sbi)) {
 		secno = find_first_zero_bit(free_i->free_secmap,
 							MAIN_SECS(sbi));
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index fee7ee45ceaa..bc9e5e8bb749 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -627,6 +627,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
 	}
 #endif
 
+#ifdef CONFIG_BLK_DEV_ZONED
+	if (!strcmp(a->attr.name, "zlu_io_enable")) {
+		sbi->zlu_io_enable = t;
+		return count;
+	}
+#endif
+
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	if (!strcmp(a->attr.name, "compr_written_block") ||
 		!strcmp(a->attr.name, "compr_saved_block")) {
@@ -1006,6 +1013,9 @@ F2FS_SBI_GENERAL_RW_ATTR(dir_level);
 F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
 F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms);
 #endif
+#ifdef CONFIG_BLK_DEV_ZONED
+F2FS_SBI_GENERAL_RW_ATTR(zlu_io_enable);
+#endif
 F2FS_SBI_GENERAL_RW_ATTR(readdir_ra);
 F2FS_SBI_GENERAL_RW_ATTR(max_io_bytes);
 F2FS_SBI_GENERAL_RW_ATTR(data_io_flag);
@@ -1153,6 +1163,9 @@ static struct attribute *f2fs_attrs[] = {
 #ifdef CONFIG_F2FS_IOSTAT
 	ATTR_LIST(iostat_enable),
 	ATTR_LIST(iostat_period_ms),
+#endif
+#ifdef CONFIG_BLK_DEV_ZONED
+	ATTR_LIST(zlu_io_enable),
 #endif
 	ATTR_LIST(readdir_ra),
 	ATTR_LIST(max_io_bytes),
-- 
2.25.1