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642 lines
23 KiB
C
642 lines
23 KiB
C
#include "fat32.h"
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#include <common/kprint.h>
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#include <driver/disk/ahci/ahci.h>
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#include <filesystem/MBR.h>
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#include <process/spinlock.h>
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#include <mm/slab.h>
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struct vfs_super_block_operations_t fat32_sb_ops;
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struct vfs_dir_entry_operations_t fat32_dEntry_ops;
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struct vfs_file_operations_t fat32_file_ops;
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struct vfs_inode_operations_t fat32_inode_ops;
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/**
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* @brief 注册指定磁盘上的指定分区的fat32文件系统
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*
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* @param ahci_ctrl_num ahci控制器编号
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* @param ahci_port_num ahci控制器端口编号
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* @param part_num 磁盘分区编号
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*
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* @return struct vfs_super_block_t * 文件系统的超级块
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*/
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struct vfs_superblock_t *fat32_register_partition(uint8_t ahci_ctrl_num, uint8_t ahci_port_num, uint8_t part_num)
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{
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struct MBR_disk_partition_table_t *DPT = MBR_read_partition_table(ahci_ctrl_num, ahci_port_num);
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// for(i = 0 ;i < 512 ; i++)
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// color_printk(PURPLE,WHITE,"%02x",buf[i]);
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printk_color(ORANGE, BLACK, "DPTE[0] start_LBA:%#018lx\ttype:%#018lx\n", DPT->DPTE[part_num].starting_LBA, DPT->DPTE[part_num].type);
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uint8_t buf[512] = {0};
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// 读取文件系统的boot扇区
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ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, DPT->DPTE[part_num].starting_LBA, 1, (uint64_t)&buf, ahci_ctrl_num, ahci_port_num);
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// 挂载文件系统到vfs
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return vfs_mount_fs("FAT32", (void *)(&DPT->DPTE[part_num]), VFS_DPT_MBR, buf, ahci_ctrl_num, ahci_port_num, part_num);
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}
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/**
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* @brief 读取指定簇的FAT表项
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*
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* @param fsbi fat32超级块私有信息结构体
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* @param cluster 指定簇
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* @return uint32_t 下一个簇的簇号
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*/
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uint32_t fat32_read_FAT_entry(fat32_sb_info_t *fsbi, uint32_t cluster)
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{
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// 计算每个扇区内含有的FAT表项数
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// FAT每项4bytes
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uint32_t fat_ent_per_sec = (fsbi->bootsector.BPB_BytesPerSec >> 2); // 该值应为2的n次幂
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uint32_t buf[256];
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memset(buf, 0, fsbi->bootsector.BPB_BytesPerSec);
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// 读取一个sector的数据，
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ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1,
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(uint64_t)&buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
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// 返回下一个fat表项的值（也就是下一个cluster）
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return buf[cluster & (fat_ent_per_sec - 1)] & 0x0fffffff;
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;
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}
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/**
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* @brief 写入指定簇的FAT表项
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*
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* @param fsbi fat32超级块私有信息结构体
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* @param cluster 指定簇
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* @param value 要写入该fat表项的值
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* @return uint32_t errcode
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*/
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uint32_t fat32_write_FAT_entry(fat32_sb_info_t *fsbi, uint32_t cluster, uint32_t value)
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{
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// 计算每个扇区内含有的FAT表项数
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// FAT每项4bytes
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uint32_t fat_ent_per_sec = (fsbi->bootsector.BPB_BytesPerSec >> 2); // 该值应为2的n次幂
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uint32_t buf[256];
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memset(buf, 0, fsbi->bootsector.BPB_BytesPerSec);
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ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1,
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(uint64_t)&buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
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buf[cluster & (fat_ent_per_sec - 1)] = (buf[cluster & (fat_ent_per_sec - 1)] & 0xf0000000) | (value & 0x0fffffff);
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// 向FAT1和FAT2写入数据
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ahci_operation.transfer(ATA_CMD_WRITE_DMA_EXT, fsbi->FAT1_base_sector + (cluster / fat_ent_per_sec), 1,
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(uint64_t)&buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
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ahci_operation.transfer(ATA_CMD_WRITE_DMA_EXT, fsbi->FAT2_base_sector + (cluster / fat_ent_per_sec), 1,
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(uint64_t)&buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
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return 0;
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}
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/**
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* @brief 在父目录中寻找指定的目录项
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*
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* @param parent_inode 父目录项的inode
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* @param dest_inode 搜索目标目录项的inode
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* @return struct vfs_dir_entry_t* 目标目录项
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*/
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struct vfs_dir_entry_t *fat32_lookup(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dentry)
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{
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int errcode = 0;
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struct fat32_inode_info_t *finode = (struct fat32_inode_info_t *)parent_inode->private_inode_info;
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fat32_sb_info_t *fsbi = (fat32_sb_info_t *)parent_inode->sb->private_sb_info;
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uint8_t *buf = kmalloc(fsbi->bytes_per_clus, 0);
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memset(buf, 0, fsbi->bytes_per_clus);
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// 计算父目录项的起始簇号
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uint32_t cluster = finode->first_clus;
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struct fat32_Directory_t *tmp_dEntry = NULL;
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while (true)
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{
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// 计算父目录项的起始LBA扇区号
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uint64_t sector = fsbi->first_data_sector + (cluster - 2) * fsbi->sec_per_clus;
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// kdebug("fat32_part_info[part_id].bootsector.BPB_SecPerClus=%d",fat32_part_info[part_id].bootsector.BPB_SecPerClus);
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// kdebug("sector=%d",sector);
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// 读取父目录项的起始簇数据
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ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, sector, fsbi->sec_per_clus, (uint64_t)buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
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// ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, sector, fat32_part_info[part_id].bootsector.BPB_SecPerClus, (uint64_t)buf, fat32_part_info[part_id].ahci_ctrl_num, fat32_part_info[part_id].ahci_port_num);
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tmp_dEntry = (struct fat32_Directory_t *)buf;
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// 查找短目录项
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for (int i = 0; i < fsbi->bytes_per_clus; i += 32, ++tmp_dEntry)
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{
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// 跳过长目录项
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if (tmp_dEntry->DIR_Attr == ATTR_LONG_NAME)
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continue;
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// 跳过无效页表项、空闲页表项
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if (tmp_dEntry->DIR_Name[0] == 0xe5 || tmp_dEntry->DIR_Name[0] == 0x00 || tmp_dEntry->DIR_Name[0] == 0x05)
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continue;
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// 找到长目录项，位于短目录项之前
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struct fat32_LongDirectory_t *tmp_ldEntry = (struct fat32_LongDirectory_t *)tmp_dEntry - 1;
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int js = 0;
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// 遍历每个长目录项
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while (tmp_ldEntry->LDIR_Attr == ATTR_LONG_NAME && tmp_ldEntry->LDIR_Ord != 0xe5)
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{
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// 比较name1
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for (int x = 0; x < 5; ++x)
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{
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if (js > dest_dentry->name_length && tmp_ldEntry->LDIR_Name1[x] == 0xffff)
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continue;
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else if (js > dest_dentry->name_length || tmp_ldEntry->LDIR_Name1[x] != (uint16_t)(dest_dentry->name[js++])) // 文件名不匹配，检索下一个短目录项
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goto continue_cmp_fail;
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}
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// 比较name2
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for (int x = 0; x < 6; ++x)
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{
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if (js > dest_dentry->name_length && tmp_ldEntry->LDIR_Name2[x] == 0xffff)
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continue;
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else if (js > dest_dentry->name_length || tmp_ldEntry->LDIR_Name2[x] != (uint16_t)(dest_dentry->name[js++])) // 文件名不匹配，检索下一个短目录项
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goto continue_cmp_fail;
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}
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// 比较name3
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for (int x = 0; x < 2; ++x)
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{
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if (js > dest_dentry->name_length && tmp_ldEntry->LDIR_Name3[x] == 0xffff)
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continue;
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else if (js > dest_dentry->name_length || tmp_ldEntry->LDIR_Name3[x] != (uint16_t)(dest_dentry->name[js++])) // 文件名不匹配，检索下一个短目录项
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goto continue_cmp_fail;
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}
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if (js >= dest_dentry->name_length) // 找到需要的目录项，返回
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{
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goto find_lookup_success;
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}
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--tmp_ldEntry; // 检索下一个长目录项
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}
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// 不存在长目录项，匹配短目录项的基础名
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js = 0;
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for (int x = 0; x < 8; ++x)
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{
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switch (tmp_dEntry->DIR_Name[x])
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{
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case ' ':
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if (!(tmp_dEntry->DIR_Attr & ATTR_DIRECTORY)) // 不是文件夹（是文件）
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{
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if (dest_dentry->name[js] == '.')
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continue;
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else if (tmp_dEntry->DIR_Name[x] == dest_dentry->name[js])
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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}
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else // 是文件夹
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{
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if (js < dest_dentry->name_length && tmp_dEntry->DIR_Name[x] == dest_dentry->name[js]) // 当前位正确匹配
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{
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++js;
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break; // 进行下一位的匹配
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}
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else if (js == dest_dentry->name_length)
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continue;
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else
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goto continue_cmp_fail;
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}
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break;
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// 当前位是字母
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case 'A' ... 'Z':
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case 'a' ... 'z':
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if (tmp_dEntry->DIR_NTRes & LOWERCASE_BASE) // 为兼容windows系统，检测DIR_NTRes字段
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{
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if (js < dest_dentry->name_length && (tmp_dEntry->DIR_Name[x] + 32 == dest_dentry->name[js]))
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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}
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else
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{
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if (js < dest_dentry->name_length && tmp_dEntry->DIR_Name[x] == dest_dentry->name[js])
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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}
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break;
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case '0' ... '9':
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if (js < dest_dentry->name_length && tmp_dEntry->DIR_Name[x] == dest_dentry->name[js])
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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break;
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default:
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++js;
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break;
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}
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}
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// 若短目录项为文件，则匹配扩展名
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if (!(tmp_dEntry->DIR_Attr & ATTR_DIRECTORY))
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{
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++js;
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for (int x = 8; x < 11; ++x)
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{
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switch (tmp_dEntry->DIR_Name[x])
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{
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// 当前位是字母
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case 'A' ... 'Z':
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case 'a' ... 'z':
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if (tmp_dEntry->DIR_NTRes & LOWERCASE_EXT) // 为兼容windows系统，检测DIR_NTRes字段
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{
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if ((tmp_dEntry->DIR_Name[x] + 32 == dest_dentry->name[js]))
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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}
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else
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{
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if (tmp_dEntry->DIR_Name[x] == dest_dentry->name[js])
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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}
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break;
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case '0' ... '9':
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case ' ':
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if (tmp_dEntry->DIR_Name[x] == dest_dentry->name[js])
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{
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++js;
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break;
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}
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else
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goto continue_cmp_fail;
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break;
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default:
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goto continue_cmp_fail;
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break;
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}
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}
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}
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goto find_lookup_success;
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continue_cmp_fail:;
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}
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// 当前簇没有发现目标文件名，寻找下一个簇
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cluster = fat32_read_FAT_entry(fsbi, cluster);
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if (cluster >= 0x0ffffff7) // 寻找完父目录的所有簇，都没有找到目标文件名
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{
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kfree(buf);
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return NULL;
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}
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}
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find_lookup_success:; // 找到目标dentry
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struct vfs_index_node_t *p = (struct vfs_index_node_t *)kmalloc(sizeof(struct vfs_index_node_t), 0);
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memset(p, 0, sizeof(struct vfs_index_node_t));
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p->file_size = tmp_dEntry->DIR_FileSize;
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// 计算文件占用的扇区数, 由于最小存储单位是簇，因此需要按照簇的大小来对齐扇区
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p->blocks = (p->file_size + fsbi->bytes_per_clus - 1) / fsbi->bytes_per_sec;
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p->attribute = (tmp_dEntry->DIR_Attr & ATTR_DIRECTORY) ? VFS_ATTR_DIR : VFS_ATTR_FILE;
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p->sb = parent_inode->sb;
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p->file_ops = &fat32_file_ops;
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p->inode_ops = &fat32_inode_ops;
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// 为inode的与文件系统相关的信息结构体分配空间
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p->private_inode_info = (void *)kmalloc(sizeof(fat32_inode_info_t), 0);
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memset(p->private_inode_info, 0, sizeof(fat32_inode_info_t));
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finode = (fat32_inode_info_t *)p->private_inode_info;
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finode->first_clus = ((tmp_dEntry->DIR_FstClusHI << 16) | tmp_dEntry->DIR_FstClusLO) & 0x0fffffff;
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finode->dEntry_location_clus = cluster;
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finode->dEntry_location_clus_offset = tmp_dEntry - (struct fat32_Directory_t *)buf; //计算dentry的偏移量
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finode->create_date = tmp_dEntry->DIR_CrtDate;
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finode->create_time = tmp_dEntry->DIR_CrtTime;
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finode->write_date = tmp_dEntry->DIR_WrtDate;
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finode->write_time = tmp_dEntry->DIR_WrtTime;
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dest_dentry->dir_inode = p;
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kfree(buf);
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return dest_dentry;
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}
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/**
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* @brief 创建fat32文件系统的超级块
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*
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* @param DPTE 磁盘分区表entry
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* @param DPT_type 磁盘分区表类型
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* @param buf fat32文件系统的引导扇区
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* @return struct vfs_superblock_t* 创建好的超级块
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*/
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struct vfs_superblock_t *fat32_read_superblock(void *DPTE, uint8_t DPT_type, void *buf, int8_t ahci_ctrl_num, int8_t ahci_port_num, int8_t part_num)
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{
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if (DPT_type != VFS_DPT_MBR) // 暂时只支持MBR分区表
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{
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kerror("fat32_read_superblock(): Unsupported DPT!");
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return NULL;
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}
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// 分配超级块的空间
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struct vfs_superblock_t *sb_ptr = (struct vfs_superblock_t *)kmalloc(sizeof(struct vfs_superblock_t), 0);
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memset(sb_ptr, 0, sizeof(struct vfs_superblock_t));
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sb_ptr->sb_ops = &fat32_sb_ops;
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sb_ptr->private_sb_info = kmalloc(sizeof(fat32_sb_info_t), 0);
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memset(sb_ptr->private_sb_info, 0, sizeof(fat32_sb_info_t));
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struct fat32_BootSector_t *fbs = (struct fat32_BootSector_t *)buf;
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fat32_sb_info_t *fsbi = (fat32_sb_info_t *)(sb_ptr->private_sb_info);
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// MBR分区表entry
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struct MBR_disk_partition_table_entry_t *MBR_DPTE = (struct MBR_disk_partition_table_entry_t *)DPTE;
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fsbi->ahci_ctrl_num = ahci_ctrl_num;
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fsbi->ahci_port_num = ahci_port_num;
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fsbi->part_num = part_num;
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fsbi->starting_sector = MBR_DPTE->starting_LBA;
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fsbi->sector_count = MBR_DPTE->total_sectors;
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fsbi->sec_per_clus = fbs->BPB_SecPerClus;
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fsbi->bytes_per_clus = fbs->BPB_SecPerClus * fbs->BPB_BytesPerSec;
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fsbi->bytes_per_sec = fbs->BPB_BytesPerSec;
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fsbi->first_data_sector = MBR_DPTE->starting_LBA + fbs->BPB_RsvdSecCnt + fbs->BPB_FATSz32 * fbs->BPB_NumFATs;
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fsbi->FAT1_base_sector = MBR_DPTE->starting_LBA + fbs->BPB_RsvdSecCnt;
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fsbi->FAT2_base_sector = fsbi->FAT1_base_sector + fbs->BPB_FATSz32;
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fsbi->sec_per_FAT = fbs->BPB_FATSz32;
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fsbi->NumFATs = fbs->BPB_NumFATs;
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fsbi->fsinfo_sector_addr_infat = fbs->BPB_FSInfo;
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fsbi->bootsector_bak_sector_addr_infat = fbs->BPB_BkBootSec;
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printk_color(ORANGE, BLACK, "FAT32 Boot Sector\n\tBPB_FSInfo:%#018lx\n\tBPB_BkBootSec:%#018lx\n\tBPB_TotSec32:%#018lx\n", fbs->BPB_FSInfo, fbs->BPB_BkBootSec, fbs->BPB_TotSec32);
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// fsinfo扇区的信息
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memset(&fsbi->fsinfo, 0, sizeof(struct fat32_FSInfo_t));
|
||
ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, MBR_DPTE->starting_LBA + fbs->BPB_FSInfo, 1, (uint64_t)&fsbi->fsinfo, ahci_ctrl_num, ahci_port_num);
|
||
printk_color(BLUE, BLACK, "FAT32 FSInfo\n\tFSI_LeadSig:%#018lx\n\tFSI_StrucSig:%#018lx\n\tFSI_Free_Count:%#018lx\n", fsbi->fsinfo.FSI_LeadSig, fsbi->fsinfo.FSI_StrucSig, fsbi->fsinfo.FSI_Free_Count);
|
||
|
||
// 初始化超级块的dir entry
|
||
sb_ptr->root = (struct vfs_dir_entry_t *)kmalloc(sizeof(struct vfs_dir_entry_t), 0);
|
||
memset(sb_ptr->root, 0, sizeof(struct vfs_dir_entry_t));
|
||
|
||
list_init(&sb_ptr->root->child_node_list);
|
||
list_init(&sb_ptr->root->subdirs_list);
|
||
|
||
sb_ptr->root->parent = sb_ptr->root;
|
||
sb_ptr->root->dir_ops = &fat32_dEntry_ops;
|
||
// 分配2个字节的name
|
||
sb_ptr->root->name = (char *)(kmalloc(2, 0));
|
||
sb_ptr->root->name[0] = '/';
|
||
sb_ptr->root->name_length = 1;
|
||
|
||
// 为root目录项分配index node
|
||
sb_ptr->root->dir_inode = (struct vfs_index_node_t *)kmalloc(sizeof(struct vfs_index_node_t), 0);
|
||
memset(sb_ptr->root->dir_inode, 0, sizeof(struct vfs_index_node_t));
|
||
sb_ptr->root->dir_inode->inode_ops = &fat32_inode_ops;
|
||
sb_ptr->root->dir_inode->file_ops = &fat32_file_ops;
|
||
sb_ptr->root->dir_inode->file_size = 0;
|
||
// 计算文件占用的扇区数, 由于最小存储单位是簇，因此需要按照簇的大小来对齐扇区
|
||
sb_ptr->root->dir_inode->blocks = (sb_ptr->root->dir_inode->file_size + fsbi->bytes_per_clus - 1) / fsbi->bytes_per_sec;
|
||
sb_ptr->root->dir_inode->attribute = VFS_ATTR_DIR;
|
||
sb_ptr->root->dir_inode->sb = sb_ptr; // 反向绑定对应的超级块
|
||
|
||
// 初始化inode信息
|
||
sb_ptr->root->dir_inode->private_inode_info = kmalloc(sizeof(struct fat32_inode_info_t), 0);
|
||
memset(sb_ptr->root->dir_inode->private_inode_info, 0, sizeof(struct fat32_inode_info_t));
|
||
struct fat32_inode_info_t *finode = (struct fat32_inode_info_t *)sb_ptr->root->dir_inode->private_inode_info;
|
||
|
||
finode->first_clus = fbs->BPB_RootClus;
|
||
finode->dEntry_location_clus = 0;
|
||
finode->dEntry_location_clus_offset = 0;
|
||
finode->create_time = 0;
|
||
finode->create_date = 0;
|
||
finode->write_date = 0;
|
||
finode->write_time;
|
||
|
||
return sb_ptr;
|
||
}
|
||
|
||
/**
|
||
* @brief todo: 写入superblock
|
||
*
|
||
* @param sb
|
||
*/
|
||
void fat32_write_superblock(struct vfs_superblock_t *sb)
|
||
{
|
||
}
|
||
|
||
/**
|
||
* @brief 释放superblock的内存空间
|
||
*
|
||
* @param sb 要被释放的superblock
|
||
*/
|
||
void fat32_put_superblock(struct vfs_superblock_t *sb)
|
||
{
|
||
kfree(sb->private_sb_info);
|
||
kfree(sb->root->dir_inode->private_inode_info);
|
||
kfree(sb->root->dir_inode);
|
||
kfree(sb->root);
|
||
kfree(sb);
|
||
}
|
||
|
||
/**
|
||
* @brief 写入inode到硬盘上
|
||
*
|
||
* @param inode
|
||
*/
|
||
void fat32_write_inode(struct vfs_index_node_t *inode)
|
||
{
|
||
fat32_inode_info_t *finode = inode->private_inode_info;
|
||
|
||
if (finode->dEntry_location_clus == 0)
|
||
{
|
||
kerror("FAT32 error: Attempt to write the root inode");
|
||
return;
|
||
}
|
||
|
||
fat32_sb_info_t *fsbi = (fat32_sb_info_t *)inode->sb->private_sb_info;
|
||
|
||
// 计算目标inode对应数据区的LBA地址
|
||
uint64_t fLBA = fsbi->first_data_sector + (finode->dEntry_location_clus - 2) * fsbi->sec_per_clus;
|
||
|
||
uint8_t *buf = (uint8_t *)kmalloc(fsbi->bytes_per_clus, 0);
|
||
memset(buf, 0, sizeof(fsbi->bytes_per_clus));
|
||
ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, fLBA, fsbi->sec_per_clus, (uint64_t)buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
|
||
|
||
// 计算目标dEntry所在的位置
|
||
struct fat32_Directory_t *fdEntry = (struct fat32_Directory_t *)((uint64_t)buf + finode->dEntry_location_clus_offset);
|
||
|
||
// 写入fat32文件系统的dir_entry
|
||
fdEntry->DIR_FileSize = inode->file_size;
|
||
fdEntry->DIR_FstClusLO = finode->first_clus & 0xffff;
|
||
fdEntry->DIR_FstClusHI = (finode->first_clus >> 16) | (fdEntry->DIR_FstClusHI & 0xf000);
|
||
|
||
// 将dir entry写回磁盘
|
||
ahci_operation.transfer(ATA_CMD_WRITE_DMA_EXT, fLBA, fsbi->sec_per_clus, (uint64_t)buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
|
||
|
||
kfree(buf);
|
||
}
|
||
|
||
struct vfs_super_block_operations_t fat32_sb_ops =
|
||
{
|
||
.write_superblock = fat32_write_superblock,
|
||
.put_superblock = fat32_put_superblock,
|
||
.write_inode = fat32_write_inode,
|
||
};
|
||
|
||
// todo: compare
|
||
long fat32_compare(struct vfs_dir_entry_t *parent_dEntry, char *source_filename, char *dest_filename)
|
||
{
|
||
}
|
||
// todo: hash
|
||
long fat32_hash(struct vfs_dir_entry_t *dEntry, char *filename)
|
||
{
|
||
}
|
||
// todo: release
|
||
long fat32_release(struct vfs_dir_entry_t *dEntry)
|
||
{
|
||
}
|
||
// todo: iput
|
||
long fat32_iput(struct vfs_dir_entry_t *dEntry, struct vfs_index_node_t *inode)
|
||
{
|
||
}
|
||
|
||
/**
|
||
* @brief fat32文件系统对于dEntry的操作
|
||
*
|
||
*/
|
||
struct vfs_dir_entry_operations_t fat32_dEntry_ops =
|
||
{
|
||
.compare = fat32_compare,
|
||
.hash = fat32_hash,
|
||
.release = fat32_release,
|
||
.iput = fat32_iput,
|
||
};
|
||
|
||
// todo: open
|
||
long fat32_open(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr)
|
||
{
|
||
return VFS_SUCCESS;
|
||
}
|
||
|
||
// todo: close
|
||
long fat32_close(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr)
|
||
{
|
||
}
|
||
|
||
// todo: read
|
||
long fat32_read(struct vfs_file_t *file_ptr, char *buf, uint64_t buf_size, long *position)
|
||
{
|
||
}
|
||
// todo: write
|
||
long fat32_write(struct vfs_file_t *file_ptr, char *buf, uint64_t buf_size, long *position)
|
||
{
|
||
}
|
||
// todo: lseek
|
||
long fat32_lseek(struct vfs_file_t *file_ptr, long offset, long origin)
|
||
{
|
||
}
|
||
// todo: ioctl
|
||
long fat32_ioctl(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr, uint64_t cmd, uint64_t arg)
|
||
{
|
||
}
|
||
|
||
/**
|
||
* @brief fat32文件系统，关于文件的操作
|
||
*
|
||
*/
|
||
struct vfs_file_operations_t fat32_file_ops =
|
||
{
|
||
.open = fat32_open,
|
||
.close = fat32_close,
|
||
.read = fat32_read,
|
||
.write = fat32_write,
|
||
.lseek = fat32_lseek,
|
||
.ioctl = fat32_ioctl,
|
||
};
|
||
|
||
// todo: create
|
||
long fat32_create(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dentry, int mode)
|
||
{
|
||
}
|
||
|
||
// todo: mkdir
|
||
int64_t fat32_mkdir(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry, int mode)
|
||
{
|
||
}
|
||
|
||
// todo: rmdir
|
||
int64_t fat32_rmdir(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry)
|
||
{
|
||
}
|
||
|
||
// todo: rename
|
||
int64_t fat32_rename(struct vfs_index_node_t *old_inode, struct vfs_dir_entry_t *old_dEntry, struct vfs_index_node_t *new_inode, struct vfs_dir_entry_t *new_dEntry)
|
||
{
|
||
}
|
||
|
||
// todo: getAttr
|
||
int64_t fat32_getAttr(struct vfs_dir_entry_t *dEntry, uint64_t *attr)
|
||
{
|
||
}
|
||
|
||
// todo: setAttr
|
||
int64_t fat32_setAttr(struct vfs_dir_entry_t *dEntry, uint64_t *attr)
|
||
{
|
||
}
|
||
|
||
struct vfs_inode_operations_t fat32_inode_ops =
|
||
{
|
||
.create = fat32_create,
|
||
.mkdir = fat32_mkdir,
|
||
.rmdir = fat32_rmdir,
|
||
.lookup = fat32_lookup,
|
||
.rename = fat32_rename,
|
||
.getAttr = fat32_getAttr,
|
||
.setAttr = fat32_setAttr,
|
||
|
||
};
|
||
|
||
struct vfs_filesystem_type_t fat32_fs_type =
|
||
{
|
||
.name = "FAT32",
|
||
.fs_flags = 0,
|
||
.read_superblock = fat32_read_superblock,
|
||
.next = NULL,
|
||
};
|
||
void fat32_init()
|
||
{
|
||
|
||
kinfo("Initializing FAT32...");
|
||
|
||
// 在VFS中注册fat32文件系统
|
||
vfs_register_filesystem(&fat32_fs_type);
|
||
|
||
// 挂载根文件系统
|
||
vfs_root_sb = fat32_register_partition(0, 0, 0);
|
||
kinfo("FAT32 initialized.");
|
||
} |