Commit f5e5177f authored by Chi Zhiling's avatar Chi Zhiling Committed by Namjae Jeon
Browse files

exfat: introduce exfat_cluster_walk helper 



Introduce exfat_cluster_walk() to walk the FAT chain by a given step,
handling both ALLOC_NO_FAT_CHAIN and ALLOC_FAT_CHAIN modes. Also
redefine exfat_get_next_cluster as a thin wrapper around it for
backward compatibility.

Signed-off-by: default avatarChi Zhiling <chizhiling@kylinos.cn>
Reviewed-by: default avatarSungjong Seo <sj1557.seo@samsung.com>
Reviewed-by: default avatarYuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent ff37797b

fs/exfat/exfat_fs.h

+22 −1
Original line number Diff line number Diff line
@@ -437,7 +437,8 @@ int exfat_set_volume_dirty(struct super_block *sb); 
int exfat_clear_volume_dirty(struct super_block *sb);



/* fatent.c */

#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu, NULL)

#define exfat_get_next_cluster(sb, pclu) \

	exfat_cluster_walk(sb, (pclu), 1, ALLOC_FAT_CHAIN)



int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,

		struct exfat_chain *p_chain, bool sync_bmap);
@@ -456,6 +457,26 @@ int exfat_count_num_clusters(struct super_block *sb, 
int exfat_blk_readahead(struct super_block *sb, sector_t sec,

		sector_t *ra, blkcnt_t *ra_cnt, sector_t end);



static inline int

exfat_cluster_walk(struct super_block *sb, unsigned int *clu,

		unsigned int step, int flags)

{

	struct buffer_head *bh = NULL;



	if (flags == ALLOC_NO_FAT_CHAIN) {

		(*clu) += step;

		return 0;

	}



	while (step--) {

		if (exfat_ent_get(sb, *clu, clu, &bh))

			return -EIO;

	}

	brelse(bh);



	return 0;

}



/* balloc.c */

int exfat_load_bitmap(struct super_block *sb);

void exfat_free_bitmap(struct exfat_sb_info *sbi);