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exfat: introduce exfat_cluster_walk helper

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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: Chi Zhiling <chizhiling@kylinos.cn>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Chi Zhiling 2026-04-03 16:05:34 +08:00 committed by Namjae Jeon
parent ff37797bad
commit f5e5177fd7
1 changed files with 22 additions and 1 deletions
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23
fs/exfat/exfat_fs.h
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@ -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);