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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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67
kernel/syscall/syscall.c
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@ -108,7 +108,6 @@ ul sys_put_string(struct pt_regs *regs)
uint64_t sys_open(struct pt_regs *regs)
{
char *filename = (char *)(regs->r8);
int flags = (int)(regs->r9);
// kdebug("filename=%s", filename);
@ -131,6 +130,12 @@ uint64_t sys_open(struct pt_regs *regs)
memset(path, 0, path_len);
strncpy_from_user(path, filename, path_len);
// 去除末尾的 '/'
if (path_len >= 2 && path[path_len - 2] == '/')
{
path[path_len - 2] = '\0';
--path_len;
}
// 寻找文件
struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
@ -139,7 +144,61 @@ uint64_t sys_open(struct pt_regs *regs)
// printk_color(ORANGE, BLACK, "Found %s\nDIR_FstClus:%#018lx\tDIR_FileSize:%#018lx\n", path, ((struct fat32_inode_info_t *)(dentry->dir_inode->private_inode_info))->first_clus, dentry->dir_inode->file_size);
// else
// printk_color(ORANGE, BLACK, "Can`t find file\n");
kdebug("flags=%#018lx", flags);
if (dentry == NULL && flags & O_CREAT)
{
// 先找到倒数第二级目录
int tmp_index = -1;
for (int i = path_len - 1; i >= 0; --i)
{
if (path[i] == '/')
{
tmp_index = i;
break;
}
}
struct vfs_dir_entry_t *parent_dentry = NULL;
kdebug("tmp_index=%d", tmp_index);
if (tmp_index > 0)
{
path[tmp_index] = '\0';
dentry = vfs_path_walk(path, 0);
if (dentry == NULL)
{
kfree(path);
return -ENOENT;
}
parent_dentry = dentry;
}
else
parent_dentry = vfs_root_sb->root;
// 创建新的文件
dentry = (struct vfs_dir_entry_t *)kmalloc(sizeof(struct vfs_dir_entry_t), 0);
memset(dentry, 0, sizeof(struct vfs_dir_entry_t));
dentry->name_length = path_len - tmp_index - 1;
dentry->name = (char *)kmalloc(dentry->name_length, 0);
memset(dentry->name, 0, dentry->name_length);
strncpy(dentry->name, path + tmp_index + 1, dentry->name_length);
kdebug("to create new file:%s namelen=%d", dentry->name, dentry->name_length)
dentry->parent = parent_dentry;
uint64_t retval = parent_dentry->dir_inode->inode_ops->create(parent_dentry->dir_inode, dentry, 0);
if (retval != 0)
{
kfree(dentry->name);
kfree(dentry);
kfree(path);
return retval;
}
list_init(&dentry->child_node_list);
list_init(&dentry->subdirs_list);
list_add(&parent_dentry->subdirs_list, &dentry->child_node_list);
kdebug("created.");
}
kfree(path);
if (dentry == NULL)
return -ENOENT;
@ -148,9 +207,9 @@ uint64_t sys_open(struct pt_regs *regs)
if ((flags & O_DIRECTORY) && (dentry->dir_inode->attribute != VFS_ATTR_DIR))
return -ENOTDIR;
// 要找的目标是文件夹
if ((flags & O_DIRECTORY) && dentry->dir_inode->attribute == VFS_ATTR_DIR)
return -EISDIR;
// // 要找的目标是文件夹
// if ((flags & O_DIRECTORY) && dentry->dir_inode->attribute == VFS_ATTR_DIR)
// return -EISDIR;
// todo: 引入devfs后删除这段代码
// 暂时遇到设备文件的话，就将其first clus设置为特定值