diff options
| author | Chi Zhiling <chizhiling@kylinos.cn> | 2026-04-03 16:05:34 +0800 |
|---|---|---|
| committer | Namjae Jeon <linkinjeon@kernel.org> | 2026-04-03 22:41:04 +0900 |
| commit | f5e5177fd751529a3c951a0f4f7a05fdfadab775 (patch) | |
| tree | 4aaea2e62a734aad151a2f6bcc963d5d0e244c9a /fs/exfat | |
| parent | ff37797badd831797b8a27830fe5046d7e23fdc3 (diff) | |
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: 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>
Diffstat (limited to 'fs/exfat')
| -rw-r--r-- | fs/exfat/exfat_fs.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index 9fed9fb33cae..7f9d0cfa252b 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -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); |