f2fs: Add defrag_blocks sysfs node

Add the defrag_blocks sysfs node to track
the amount of data blocks moved during filesystem
defragmentation.

Signed-off-by: Sheng Yong <shengyong1@xiaomi.com>
Signed-off-by: liujinbao1 <liujinbao1@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

5 files changed, 25 insertions, 1 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index c1d2b3fd9c65..423ec40e2e4e 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -407,6 +407,12 @@ Contact:	"Hridya Valsaraju" <hridya@google.com>
 Description:	Average number of valid blocks.
 		Available when CONFIG_F2FS_STAT_FS=y.
 
+What:		/sys/fs/f2fs/<disk>/defrag_blocks
+Date:		February 2026
+Contact:	"Jinbao Liu" <liujinbao1@xiaomi.com>
+Description:	Number of blocks moved by defragment.
+		Available when CONFIG_F2FS_STAT_FS=y.
+
 What:		/sys/fs/f2fs/<disk>/mounted_time_sec
 Date:		February 2020
 Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 8e1040e375a7..af88db8fdb71 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -659,6 +659,7 @@ static int stat_show(struct seq_file *s, void *v)
 				si->bg_node_blks);
 		seq_printf(s, "BG skip : IO: %u, Other: %u\n",
 				si->io_skip_bggc, si->other_skip_bggc);
+		seq_printf(s, "defrag blocks : %u\n", si->defrag_blks);
 		seq_puts(s, "\nExtent Cache (Read):\n");
 		seq_printf(s, "  - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
 				si->hit_largest, si->hit_cached[EX_READ],
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index bb34e864d0ef..dbf23cb2c501 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4288,6 +4288,7 @@ struct f2fs_stat_info {
 	int gc_secs[2][2];
 	int tot_blks, data_blks, node_blks;
 	int bg_data_blks, bg_node_blks;
+	unsigned int defrag_blks;
 	int blkoff[NR_CURSEG_TYPE];
 	int curseg[NR_CURSEG_TYPE];
 	int cursec[NR_CURSEG_TYPE];
@@ -4422,6 +4423,9 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
 		si->bg_node_blks += ((gc_type) == BG_GC) ? (blks) : 0;	\
 	} while (0)
 
+#define stat_inc_defrag_blk_count(sbi, blks)				\
+	(F2FS_STAT(sbi)->defrag_blks += (blks))
+
 int f2fs_build_stats(struct f2fs_sb_info *sbi);
 void f2fs_destroy_stats(struct f2fs_sb_info *sbi);
 void __init f2fs_create_root_stats(void);
@@ -4463,6 +4467,7 @@ void f2fs_update_sit_info(struct f2fs_sb_info *sbi);
 #define stat_inc_tot_blk_count(si, blks)		do { } while (0)
 #define stat_inc_data_blk_count(sbi, blks, gc_type)	do { } while (0)
 #define stat_inc_node_blk_count(sbi, blks, gc_type)	do { } while (0)
+#define stat_inc_defrag_blk_count(sbi, blks)		do { } while (0)
 
 static inline int f2fs_build_stats(struct f2fs_sb_info *sbi) { return 0; }
 static inline void f2fs_destroy_stats(struct f2fs_sb_info *sbi) { }
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index c8a2f17a8f11..2c4880f24b54 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3043,8 +3043,10 @@ out:
 	clear_inode_flag(inode, FI_OPU_WRITE);
 unlock_out:
 	inode_unlock(inode);
-	if (!err)
+	if (!err) {
 		range->len = (u64)total << PAGE_SHIFT;
+		stat_inc_defrag_blk_count(sbi, total);
+	}
 	return err;
 }
 
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 5fbfdc96e502..969e06b65b04 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -338,6 +338,14 @@ static ssize_t avg_vblocks_show(struct f2fs_attr *a,
 	f2fs_update_sit_info(sbi);
 	return sysfs_emit(buf, "%llu\n", (unsigned long long)(si->avg_vblocks));
 }
+
+static ssize_t defrag_blocks_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct f2fs_stat_info *si = F2FS_STAT(sbi);
+
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)(si->defrag_blks));
+}
 #endif
 
 static ssize_t main_blkaddr_show(struct f2fs_attr *a,
@@ -1351,6 +1359,7 @@ F2FS_GENERAL_RO_ATTR(gc_mode);
 F2FS_GENERAL_RO_ATTR(moved_blocks_background);
 F2FS_GENERAL_RO_ATTR(moved_blocks_foreground);
 F2FS_GENERAL_RO_ATTR(avg_vblocks);
+F2FS_GENERAL_RO_ATTR(defrag_blocks);
 #endif
 
 #ifdef CONFIG_FS_ENCRYPTION
@@ -1473,6 +1482,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(moved_blocks_foreground),
 	ATTR_LIST(moved_blocks_background),
 	ATTR_LIST(avg_vblocks),
+	ATTR_LIST(defrag_blocks),
 #endif
 #ifdef CONFIG_BLK_DEV_ZONED
 	ATTR_LIST(unusable_blocks_per_sec),