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Code Issues Releases Wiki Activity

🆕 fat32文件系统的mkdir

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This commit is contained in:
fslongjin
2022-06-25 20:55:59 +08:00
parent d7d449bddd
commit d775af70c7
15 changed files with 495 additions and 39 deletions
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31
kernel/syscall/syscall.c
View File

@ -270,7 +270,7 @@ uint64_t sys_read(struct pt_regs *regs)
void *buf = (void *)regs->r9;
int64_t count = (int64_t)regs->r10;
// kdebug("sys read: fd=%d", fd_num);
// kdebug("sys read: fd=%d", fd_num);
// 校验文件描述符范围
if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
@ -489,7 +489,13 @@ uint64_t sys_chdir(struct pt_regs *regs)
return -EFAULT;
// 计算输入的路径长度
int dest_path_len = strnlen_user(dest_path, PAGE_4K_SIZE);
int dest_path_len;
if (regs->cs & USER_CS)
{
dest_path_len = strnlen_user(dest_path, PAGE_4K_SIZE);
}
else
dest_path_len = strnlen(dest_path, PAGE_4K_SIZE);
// 长度小于等于0
if (dest_path_len <= 0)
@ -504,9 +510,13 @@ uint64_t sys_chdir(struct pt_regs *regs)
return -ENOMEM;
memset(path, 0, dest_path_len + 1);
// 将字符串从用户空间拷贝进来, +1是为了拷贝结尾的\0
strncpy_from_user(path, dest_path, dest_path_len + 1);
if (regs->cs & USER_CS)
{
// 将字符串从用户空间拷贝进来, +1是为了拷贝结尾的\0
strncpy_from_user(path, dest_path, dest_path_len + 1);
}
else
strncpy(path, dest_path, dest_path_len + 1);
struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
@ -605,7 +615,7 @@ uint64_t sys_wait4(struct pt_regs *regs)
uint64_t pid = regs->r8;
int *status = (int *)regs->r9;
int options = regs->r10;
void *rusage = (void*)regs->r11;
void *rusage = (void *)regs->r11;
struct process_control_block *proc = NULL;
struct process_control_block *child_proc = NULL;
@ -647,11 +657,11 @@ uint64_t sys_wait4(struct pt_regs *regs)
/**
* @brief 进程退出
*
*
* @param exit_code 退出返回码
* @return uint64_t
* @return uint64_t
*/
uint64_t sys_exit(struct pt_regs * regs)
uint64_t sys_exit(struct pt_regs *regs)
{
return process_do_exit(regs->r8);
}
@ -689,5 +699,6 @@ system_call_t system_call_table[MAX_SYSTEM_CALL_NUM] =
[14] = sys_execve,
[15] = sys_wait4,
[16] = sys_exit,
[17 ... 254] = system_call_not_exists,
[17] = sys_mkdir,
[18 ... 254] = system_call_not_exists,
[255] = sys_ahci_end_req};

9
kernel/syscall/syscall.h
View File

@ -74,6 +74,15 @@ uint64_t sys_brk(struct pt_regs *regs);
*/
uint64_t sys_sbrk(struct pt_regs *regs);
/**
* @brief 创建文件夹
* 在VFS.c中实现
* @param path(r8) 路径
* @param mode(r9) 模式
* @return uint64_t
*/
uint64_t sys_mkdir(struct pt_regs * regs);
ul sys_ahci_end_req(struct pt_regs *regs);
// 系统调用的内核入口程序

1
kernel/syscall/syscall_num.h
View File

@ -27,5 +27,6 @@
#define SYS_EXECVE 14 // 执行新的应用程序
#define SYS_WAIT4 15 // 等待进程退出
#define SYS_EXIT 16 // 进程退出
#define SYS_MKDIR 17 // 创建文件夹
#define SYS_AHCI_END_REQ 255 // AHCI DMA请求结束end_request的系统调用