21     fat32_sb_info_t *fsbi = (fat32_sb_info_t *)inode->sb->private_sb_info;  in fat32_alloc_clusters()  local
24     uint64_t sec_per_fat = fsbi->sec_per_FAT;  in fat32_alloc_clusters()
27     uint32_t *buf = (uint32_t *)kzalloc(fsbi->bytes_per_sec, 0);  in fat32_alloc_clusters()
28     int ent_per_sec = (fsbi->bytes_per_sec >> 2);  in fat32_alloc_clusters()
34         memset(buf, 0, fsbi->bytes_per_sec);  in fat32_alloc_clusters()
35 …blk->bd_disk->fops->transfer(blk->bd_disk, AHCI_CMD_READ_DMA_EXT, fsbi->FAT1_base_sector + i, 1, (…  in fat32_alloc_clusters()
75                 tmp_clus = fat32_read_FAT_entry(blk, fsbi, cluster);  in fat32_alloc_clusters()
87             fat32_write_FAT_entry(blk, fsbi, cluster, clusters[i]);  in fat32_alloc_clusters()
90         fat32_write_FAT_entry(blk, fsbi, cluster, 0x0ffffff8);  in fat32_alloc_clusters()
126 uint32_t fat32_read_FAT_entry(struct block_device *blk, fat32_sb_info_t *fsbi, uint32_t cluster)  in fat32_read_FAT_entry()  argument
130     uint32_t fat_ent_per_sec = (fsbi->bytes_per_sec >> 2); // 该值应为2的n次幂  in fat32_read_FAT_entry()
133     memset(buf, 0, fsbi->bytes_per_sec);  in fat32_read_FAT_entry()
137 …                          fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1, (uint64_t)&buf);  in fat32_read_FAT_entry()
152 int fat32_write_FAT_entry(struct block_device *blk, fat32_sb_info_t *fsbi, uint32_t cluster, uint32…  in fat32_write_FAT_entry()  argument
156     uint32_t fat_ent_per_sec = (fsbi->bytes_per_sec >> 2); // 该值应为2的n次幂  in fat32_write_FAT_entry()
157     uint32_t *buf = kzalloc(fsbi->bytes_per_sec, 0);  in fat32_write_FAT_entry()
160 …                           fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1, (uint64_t)buf);  in fat32_write_FAT_entry()
165 …                           fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1, (uint64_t)buf);  in fat32_write_FAT_entry()
167 …                           fsbi->FAT2_base_sector + (cluster / fat_ent_per_sec), 1, (uint64_t)buf);  in fat32_write_FAT_entry()
191     fat32_sb_info_t *fsbi = (fat32_sb_info_t *)parent_inode->sb->private_sb_info;  in fat32_find_empty_dentry()  local
193     uint8_t *buf = kzalloc(fsbi->bytes_per_clus, 0);  in fat32_find_empty_dentry()
207         uint64_t sector = fsbi->first_data_sector + (cluster - 2) * fsbi->sec_per_clus;  in fat32_find_empty_dentry()
210 …blk->bd_disk->fops->transfer(blk->bd_disk, AHCI_CMD_READ_DMA_EXT, sector, fsbi->sec_per_clus, (uin…  in fat32_find_empty_dentry()
216         for (int i = 0; (i < fsbi->bytes_per_clus) && count_continuity < num; i += 32, ++tmp_dEntry)  in fat32_find_empty_dentry()
243         cluster = fat32_read_FAT_entry(blk, fsbi, cluster);  in fat32_find_empty_dentry()
257             sector = fsbi->first_data_sector + (cluster - 2) * fsbi->sec_per_clus;  in fat32_find_empty_dentry()
258             void *tmp_buf = kzalloc(fsbi->bytes_per_clus, 0);  in fat32_find_empty_dentry()
259 …     blk->bd_disk->fops->transfer(blk->bd_disk, AHCI_CMD_WRITE_DMA_EXT, sector, fsbi->sec_per_clus,  in fat32_find_empty_dentry()
438     fat32_sb_info_t *fsbi = (fat32_sb_info_t *)sb->private_sb_info;  in fat32_remove_entries()  local
457                                             fsbi->sec_per_clus, (uint64_t)sinfo->buffer);  in fat32_remove_entries()
466         next_clus = fat32_read_FAT_entry(sb->blk_device, fsbi, data_cluster);  in fat32_remove_entries()
469         retval = fat32_write_FAT_entry(sb->blk_device, fsbi, data_cluster, 0);  in fat32_remove_entries()