[f2fs-dev] [PATCH 1/2] mkfs.f2fs: update allocation policy for ro feature

[Chao Yu <chao@kernel.org>]

Update allocation policy for ro feature:
- hot_data: allocating blocks by LBA ascending order
- hot_node: allocating blocks by LBA descending order

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fsck/mount.c       |  8 ++++++++
 fsck/segment.c     | 15 ++++++++++++++-
 mkfs/f2fs_format.c |  4 ++--
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/fsck/mount.c b/fsck/mount.c
index af24484..aebe363 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -2777,6 +2777,14 @@ static void move_one_curseg_info(struct f2fs_sb_info *sbi, u64 from, int left,
 	if ((get_sb(feature) & cpu_to_le32(F2FS_FEATURE_RO))) {
 		if (i != CURSEG_HOT_DATA && i != CURSEG_HOT_NODE)
 			return;
+
+		if (i == CURSEG_HOT_DATA) {
+			left = 0;
+			from = SM_I(sbi)->main_blkaddr;
+		} else {
+			left = 1;
+			from = __end_block_addr(sbi);
+		}
 		goto bypass_ssa;
 	}
 
diff --git a/fsck/segment.c b/fsck/segment.c
index 401cbb6..0307bdd 100644
--- a/fsck/segment.c
+++ b/fsck/segment.c
@@ -28,6 +28,7 @@ int reserve_new_block(struct f2fs_sb_info *sbi, block_t *to,
 	u64 blkaddr, offset;
 	u64 old_blkaddr = *to;
 	bool is_node = IS_NODESEG(type);
+	int left = 0;
 
 	if (old_blkaddr == NULL_ADDR) {
 		if (c.func == FSCK) {
@@ -56,7 +57,19 @@ int reserve_new_block(struct f2fs_sb_info *sbi, block_t *to,
 
 	blkaddr = SM_I(sbi)->main_blkaddr;
 
-	if (find_next_free_block(sbi, &blkaddr, 0, type, false)) {
+	if (sbi->raw_super->feature & cpu_to_le32(F2FS_FEATURE_RO)) {
+		if (IS_NODESEG(type)) {
+			type = CURSEG_HOT_NODE;
+			blkaddr = __end_block_addr(sbi);
+			left = 1;
+		} else if (IS_DATASEG(type)) {
+			type = CURSEG_HOT_DATA;
+			blkaddr = SM_I(sbi)->main_blkaddr;
+			left = 0;
+		}
+	}
+
+	if (find_next_free_block(sbi, &blkaddr, left, type, false)) {
 		ERR_MSG("Can't find free block");
 		ASSERT(0);
 	}
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 40ac589..8d0f410 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -544,10 +544,10 @@ static int f2fs_prepare_super_block(void)
 	}
 
 	if (c.feature & cpu_to_le32(F2FS_FEATURE_RO)) {
-		c.cur_seg[CURSEG_HOT_NODE] = 0;
+		c.cur_seg[CURSEG_HOT_NODE] = last_section(last_zone(total_zones));
 		c.cur_seg[CURSEG_WARM_NODE] = 0;
 		c.cur_seg[CURSEG_COLD_NODE] = 0;
-		c.cur_seg[CURSEG_HOT_DATA] = 1;
+		c.cur_seg[CURSEG_HOT_DATA] = 0;
 		c.cur_seg[CURSEG_COLD_DATA] = 0;
 		c.cur_seg[CURSEG_WARM_DATA] = 0;
 	} else if (c.heap) {
-- 
2.36.1



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