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, 6 insertions, 0 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 12b0edc48f7b..51da73b27a45 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -196,6 +196,7 @@ void f2fs_abort_atomic_write(struct inode *inode, bool clean)
 		clear_inode_flag(fi->cow_inode, FI_ATOMIC_FILE);
 		iput(fi->cow_inode);
 		fi->cow_inode = NULL;
+		release_atomic_write_cnt(inode);
 		clear_inode_flag(inode, FI_ATOMIC_FILE);
 
 		spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
@@ -335,6 +336,11 @@ next:
 	}
 
 out:
+	if (ret)
+		sbi->revoked_atomic_block += fi->atomic_write_cnt;
+	else
+		sbi->committed_atomic_block += fi->atomic_write_cnt;
+
 	__complete_revoke_list(inode, &revoke_list, ret ? true : false);
 
 	return ret;