f2fs: introduce sysfs atomic write statistics

introduce the below 4 new sysfs node for atomic write statistics.
- current_atomic_write: the total current atomic write block count,
                        which is not committed yet.
- peak_atomic_write: the peak value of total current atomic write block
                     count after boot.
- committed_atomic_block: the accumulated total committed atomic write
                          block count after boot.
- revoked_atomic_block: the accumulated total revoked atomic write block
                        count after boot.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d0f428aef34b..a19f4dfc85a5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -813,6 +813,8 @@ struct f2fs_inode_info {
 	unsigned char i_compress_level;		/* compress level (lz4hc,zstd) */
 	unsigned short i_compress_flag;		/* compress flag */
 	unsigned int i_cluster_size;		/* cluster size */
+
+	unsigned int atomic_write_cnt;
 };
 
 static inline void get_extent_info(struct extent_info *ext,
@@ -1813,6 +1815,12 @@ struct f2fs_sb_info {
 	int max_fragment_chunk;			/* max chunk size for block fragmentation mode */
 	int max_fragment_hole;			/* max hole size for block fragmentation mode */
 
+	/* For atomic write statistics */
+	atomic64_t current_atomic_write;
+	s64 peak_atomic_write;
+	u64 committed_atomic_block;
+	u64 revoked_atomic_block;
+
 #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 */
@@ -2427,6 +2435,28 @@ static inline void inode_dec_dirty_pages(struct inode *inode)
 		dec_page_count(F2FS_I_SB(inode), F2FS_DIRTY_QDATA);
 }
 
+static inline void inc_atomic_write_cnt(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct f2fs_inode_info *fi = F2FS_I(inode);
+	u64 current_write;
+
+	fi->atomic_write_cnt++;
+	atomic64_inc(&sbi->current_atomic_write);
+	current_write = atomic64_read(&sbi->current_atomic_write);
+	if (current_write > sbi->peak_atomic_write)
+		sbi->peak_atomic_write = current_write;
+}
+
+static inline void release_atomic_write_cnt(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct f2fs_inode_info *fi = F2FS_I(inode);
+
+	atomic64_sub(fi->atomic_write_cnt, &sbi->current_atomic_write);
+	fi->atomic_write_cnt = 0;
+}
+
 static inline s64 get_pages(struct f2fs_sb_info *sbi, int count_type)
 {
 	return atomic_read(&sbi->nr_pages[count_type]);