f2fs: cleanup duplicate stats for atomic files

Remove duplicate sbi->aw_cnt stats counter that tracks
the number of atomic files currently opened (it also shows
incorrect value sometimes). Use more relit lable sbi->atomic_files
to show in the stats.
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/debug.c

@@ -56,7 +56,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 	si->nquota_files = sbi->nquota_files;
 	si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
 	si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
-	si->aw_cnt = atomic_read(&sbi->aw_cnt);
+	si->aw_cnt = sbi->atomic_files;
 	si->vw_cnt = atomic_read(&sbi->vw_cnt);
 	si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
 	si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt);
@@ -495,7 +495,6 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi)
 	for (i = META_CP; i < META_MAX; i++)
 		atomic_set(&sbi->meta_count[i], 0);
 
-	atomic_set(&sbi->aw_cnt, 0);
 	atomic_set(&sbi->vw_cnt, 0);
 	atomic_set(&sbi->max_aw_cnt, 0);
 	atomic_set(&sbi->max_vw_cnt, 0);

fs/f2fs/f2fs.h

@@ -1327,7 +1327,6 @@ struct f2fs_sb_info {
 	atomic_t inline_xattr;			/* # of inline_xattr inodes */
 	atomic_t inline_inode;			/* # of inline_data inodes */
 	atomic_t inline_dir;			/* # of inline_dentry inodes */
-	atomic_t aw_cnt;			/* # of atomic writes */
 	atomic_t vw_cnt;			/* # of volatile writes */
 	atomic_t max_aw_cnt;			/* max # of atomic writes */
 	atomic_t max_vw_cnt;			/* max # of volatile writes */
@@ -3388,13 +3387,9 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
 		((sbi)->block_count[(curseg)->alloc_type]++)
 #define stat_inc_inplace_blocks(sbi)					\
 		(atomic_inc(&(sbi)->inplace_count))
-#define stat_inc_atomic_write(inode)					\
-		(atomic_inc(&F2FS_I_SB(inode)->aw_cnt))
-#define stat_dec_atomic_write(inode)					\
-		(atomic_dec(&F2FS_I_SB(inode)->aw_cnt))
 #define stat_update_max_atomic_write(inode)				\
 	do {								\
-		int cur = atomic_read(&F2FS_I_SB(inode)->aw_cnt);	\
+		int cur = F2FS_I_SB(inode)->atomic_files;	\
 		int max = atomic_read(&F2FS_I_SB(inode)->max_aw_cnt);	\
 		if (cur > max)						\
 			atomic_set(&F2FS_I_SB(inode)->max_aw_cnt, cur);	\

fs/f2fs/file.c

@@ -1936,7 +1936,6 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
 
 	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	F2FS_I(inode)->inmem_task = current;
-	stat_inc_atomic_write(inode);
 	stat_update_max_atomic_write(inode);
 out:
 	inode_unlock(inode);

fs/f2fs/segment.c

@@ -334,7 +334,6 @@ void f2fs_drop_inmem_pages(struct inode *inode)
 	}
 
 	fi->i_gc_failures[GC_FAILURE_ATOMIC] = 0;
-	stat_dec_atomic_write(inode);
 
 	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 	if (!list_empty(&fi->inmem_ilist))