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🆕 fat32_create

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This commit is contained in:
fslongjin
2022-07-07 00:55:33 +08:00
parent fc3fbf7acc
commit 8c8352e748
8 changed files with 208 additions and 38 deletions
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109
kernel/filesystem/fat32/fat32.c
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@ -862,16 +862,101 @@ struct vfs_file_operations_t fat32_file_ops =
/**
* @brief 创建新的文件
* @param inode 要被创建的文件的inode结构体
* @param parent_dEntry 父目录的dentry
* @param parent_inode 父目录的inode结构体
* @param dest_dEntry 新文件的dentry
* @param mode 创建模式
*/
long fat32_create(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *parent_dEntry, int mode)
long fat32_create(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dEntry, int mode)
{
// 文件系统超级块信息
fat32_sb_info_t *fsbi = (fat32_sb_info_t *)parent_dEntry->dir_inode->sb->private_sb_info;
fat32_sb_info_t *fsbi = (fat32_sb_info_t *)parent_inode->sb->private_sb_info;
// 父目录项的inode的私有信息
struct fat32_inode_info_t *parent_inode_info = (struct fat32_inode_info_t *)parent_dEntry->dir_inode->private_inode_info;
struct fat32_inode_info_t *parent_inode_info = (struct fat32_inode_info_t *)parent_inode->private_inode_info;
int64_t retval = 0;
kdebug("dest_dEntry->name=%s",dest_dEntry->name);
// ======== 检验名称的合法性
retval = fat32_check_name_available(dest_dEntry->name, dest_dEntry->name_length, 0);
kdebug("dest_dEntry->name=%s",dest_dEntry->name);
if (retval != 0)
return retval;
if (dest_dEntry->dir_inode != NULL)
return -EEXIST;
struct vfs_index_node_t *inode = (struct vfs_index_node_t *)kmalloc(sizeof(struct vfs_index_node_t), 0);
memset((void *)inode, 0, sizeof(struct vfs_index_node_t));
dest_dEntry->dir_inode = inode;
dest_dEntry->dir_ops = &fat32_dEntry_ops;
struct fat32_inode_info_t *finode = (struct fat32_inode_info_t *)kmalloc(sizeof(struct fat32_inode_info_t), 0);
memset((void *)finode, 0, sizeof(struct fat32_inode_info_t));
inode->attribute = VFS_ATTR_FILE;
inode->file_ops = &fat32_file_ops;
inode->file_size = 0;
inode->sb = parent_inode->sb;
inode->inode_ops = &fat32_inode_ops;
inode->private_inode_info = (void *)finode;
inode->blocks = fsbi->sec_per_clus;
// 计算总共需要多少个目录项
uint32_t cnt_longname = (dest_dEntry->name_length + 25) / 26;
// 默认都是创建长目录项来存储
if (cnt_longname == 0)
cnt_longname = 1;
// 空闲dentry所在的扇区号
uint32_t tmp_dentry_sector = 0;
// 空闲dentry所在的缓冲区的基地址
uint64_t tmp_dentry_clus_buf_addr = 0;
uint64_t tmp_parent_dentry_clus = 0;
// 寻找空闲目录项
struct fat32_Directory_t *empty_fat32_dentry = fat32_find_empty_dentry(parent_inode, cnt_longname + 1, 0, &tmp_dentry_sector, &tmp_parent_dentry_clus, &tmp_dentry_clus_buf_addr);
kdebug("found empty dentry, cnt_longname=%ld", cnt_longname);
finode->first_clus = 0;
finode->dEntry_location_clus = tmp_parent_dentry_clus;
finode->dEntry_location_clus_offset = empty_fat32_dentry - (struct fat32_Directory_t *)tmp_dentry_clus_buf_addr;
// ====== 为新的文件分配一个簇 =======
uint32_t new_dir_clus;
if (fat32_alloc_clusters(inode, &new_dir_clus, 1) != 0)
{
retval = -ENOSPC;
goto fail;
}
kdebug("new dir clus=%ld", new_dir_clus);
kdebug("dest_dEntry->name=%s",dest_dEntry->name);
// ====== 填写短目录项
fat32_fill_shortname(dest_dEntry, empty_fat32_dentry, new_dir_clus);
kdebug("dest_dEntry->name=%s",dest_dEntry->name);
// 计算校验和
uint8_t short_dentry_ChkSum = fat32_ChkSum(empty_fat32_dentry->DIR_Name);
kdebug("dest_dEntry->name=%s",dest_dEntry->name);
// ======== 填写长目录项
fat32_fill_longname(dest_dEntry, (struct fat32_LongDirectory_t *)(empty_fat32_dentry - 1), short_dentry_ChkSum, cnt_longname);
// ====== 将目录项写回磁盘
kdebug("tmp_dentry_sector=%ld", tmp_dentry_sector);
ahci_operation.transfer(AHCI_CMD_WRITE_DMA_EXT, tmp_dentry_sector, fsbi->sec_per_clus, tmp_dentry_clus_buf_addr, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
// 注意：parent字段需要在调用函数的地方进行设置
// 释放在find empty dentry中动态申请的缓冲区
kfree((void *)tmp_dentry_clus_buf_addr);
return 0;
fail:;
// 释放在find empty dentry中动态申请的缓冲区
kfree((void *)tmp_dentry_clus_buf_addr);
dest_dEntry->dir_inode = NULL;
dest_dEntry->dir_ops = NULL;
kfree(finode);
kfree(inode);
return retval;
}
/**
@ -886,9 +971,9 @@ int64_t fat32_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_
// 文件系统超级块信息
fat32_sb_info_t *fsbi = (fat32_sb_info_t *)parent_inode->sb->private_sb_info;
// 父目录项的inode
// 父目录项的inode私有信息
struct fat32_inode_info_t *parent_inode_info = (struct fat32_inode_info_t *)parent_inode->private_inode_info;
// ======== todo:检验名称的合法性
// ======== 检验名称的合法性
retval = fat32_check_name_available(dEntry->name, dEntry->name_length, 0);
if (retval != 0)
return retval;
@ -915,7 +1000,7 @@ int64_t fat32_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_
inode->attribute = VFS_ATTR_DIR;
inode->blocks = fsbi->sec_per_clus;
inode->file_ops = &fat32_file_ops;
inode->file_size = fsbi->bytes_per_clus;
inode->file_size = 0;
inode->inode_ops = &fat32_inode_ops;
inode->sb = parent_inode->sb;
@ -930,14 +1015,12 @@ int64_t fat32_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_
kdebug(" p->dEntry_location_clus_offset=%d", p->dEntry_location_clus_offset);
// todo: 填写完全fat32_inode_info的信息
// 初始化dentry信息
list_init(&dEntry->child_node_list);
list_init(&dEntry->subdirs_list);
dEntry->dir_ops = &fat32_dEntry_ops;
dEntry->dir_inode = inode;
// ====== 为新的文件夹分配一个簇 =======
uint32_t new_dir_clus;
if (fat32_alloc_clusters(inode, &new_dir_clus, 1) != 0)
@ -952,10 +1035,10 @@ int64_t fat32_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_
fat32_fill_shortname(dEntry, empty_fat32_dentry, new_dir_clus);
// 计算校验和
uint8_t short_dentry_ChkSum = fat32_ChkSum(empty_fat32_dentry->DIR_Name);
uint8_t short_dentry_ChkSum = fat32_ChkSum(empty_fat32_dentry->DIR_Name);
// ======== 填写长目录项
fat32_fill_longname(dEntry, (struct fat32_LongDirectory_t * )(empty_fat32_dentry-1), short_dentry_ChkSum, cnt_longname);
fat32_fill_longname(dEntry, (struct fat32_LongDirectory_t *)(empty_fat32_dentry - 1), short_dentry_ChkSum, cnt_longname);
// ====== 将目录项写回磁盘
kdebug("tmp_dentry_sector=%ld", tmp_dentry_sector);
@ -995,8 +1078,6 @@ int64_t fat32_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_
ahci_operation.transfer(AHCI_CMD_WRITE_DMA_EXT, sector, fsbi->sec_per_clus, (uint64_t)buf, fsbi->ahci_ctrl_num, fsbi->ahci_port_num);
}
// 注意：parent字段需要在调用函数的地方进行设置
// 注意：需要将当前dentry加入父目录的subdirs_list