分类： C/C++
2013-09-12 11:04:09
原文地址：嵌入式系统USB存储设备自动mount 作者：nice_future
对于u盘能区分有分区表的和没有分区表
光驱提供了两个函数mount 和umount，并能检测vcd和cd 并使用cdfs格式进行mount。
对于分区格式的支持要看大家内核的支持情况具体修改代码
下面代码仅仅支持fat32的。
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//setMsg
extern void set_ALERT_Msg(char * buf);
#define FILE_DEV_CHECK "/proc/scsi/scsi" //用来检测设备数和类型
#define FILE_MOUNT_CHECK "/proc/mounts" //用来检测设备是否被mount
#define FILE_DISC_PARTS_CHECK "/proc/partitions" //用来检测设备的分区情况
#define FILE_DEV_STATU_TEMPL "/proc/scsi/usb-storage-%d/%d" //用来检测某一设备是否在插入状态
#define FILE_DEV_PART_TEMPL "/dev/scsi/host%d/bus0/target0/lun0/" //具体的设备
#define USB_CDROM_MP "/tmp/cdrom"
#define USB_DISK_MP "/tmp/usbdisk"
#define DBG_PRINT(x) printf("[AutoMounter]");printf x
#define DBG_PRINT2(x) printf("[AutoMounter]");printf x
#define MAX_NAME_LEN 64
#define MAX_PART_NUM 6 //最多允许6个分区
typedef struct s_scsi_usb_dev
{
int type; /*1 cdrom 2 disk */
int index; /*like host0 host1*/
char file_statu[MAX_NAME_LEN]; /*like "/proc/scsi/usb-storage-%d/%d"*/
char devfile_parts[MAX_PART_NUM][MAX_NAME_LEN]; /*存储每个分区的设备文件*/
char mount_path[MAX_PART_NUM][MAX_NAME_LEN]; /*与上面对应的mount点*/
int part_num; //分区数
struct s_scsi_usb_dev * next_dev; //指向下一个备
} SCSI_USB_DEV;
static int is_manual_umount = 1;
static SCSI_USB_DEV * f_first_dev = NULL;
static int CHECK_PARTS(SCSI_USB_DEV * dev);
static int ADD_DEV(SCSI_USB_DEV * dev);
static int INIT_DEV(SCSI_USB_DEV * dev, int index, char * type);
static void CLEAR_DEV(void);
static int find_device(void);
static int check_attach(SCSI_USB_DEV * dev);
static int check_mount(SCSI_USB_DEV * dev);
static int do_mount(SCSI_USB_DEV * dev);
static int do_umount(SCSI_USB_DEV * dev);
static int process_dev(SCSI_USB_DEV * dev);
static void * main_thread(void);
//device opt fuction
static int ADD_DEV(SCSI_USB_DEV * dev)
{
if(f_first_dev)
{
dev->next_dev = f_first_dev;
f_first_dev = dev;
}
else
{
f_first_dev = dev;
dev->next_dev = NULL;
}
return 1;
}
static int INIT_DEV(SCSI_USB_DEV * dev, int index, char * type)
{
dev->index = index;
sprintf(dev->file_statu, FILE_DEV_STATU_TEMPL, index, index);
if (!strncmp(type, "CD-ROM", 6))
{//usb cd-rom
dev->type = 1;
dev->part_num = 1;
sprintf(dev->devfile_parts[0], FILE_DEV_PART_TEMPL"cd", index);
strcpy(dev->mount_path[0],USB_CDROM_MP);
DBG_PRINT(("---%d---,%s,%s\n", dev->index, dev->devfile_parts[0],dev->mount_path[0]));
}
else
{//usb disk
dev->type = 2;
dev->part_num = CHECK_PARTS(dev);
}
return 1;
}
static int CHECK_PARTS(SCSI_USB_DEV * dev)
{
char buf[1024];
char hoststr[16];
int fd,len;
int part_num = 0;
char * line;
char * delim="\n";
char * strtok_tmp_ptr;
char * seek;
char * part_blocks;
fd = open(FILE_DISC_PARTS_CHECK, O_RDONLY);
if( fd > 0 )
{
len = read(fd, buf, sizeof(buf));
close(fd);
if (len > 0)
{
sprintf(hoststr,"scsi/host%d", dev->index);
line = strtok_r(buf, delim, &strtok_tmp_ptr);
while(line)
{
seek = strstr(line, hoststr);
if (seek)
{
part_blocks = seek - 3;
if (strncmp(part_blocks, " 1 ", 3))
{//not extend part
sprintf(dev->devfile_parts[part_num],"/dev/%s", seek);
sprintf(dev->mount_path[part_num], USB_DISK_MP"/disk%d/part%d",dev->index,part_num);
DBG_PRINT(("---%d---,%s,%s\n", dev->index, dev->devfile_parts[part_num],dev->mount_path[part_num]));
part_num ++;
if (part_num == MAX_PART_NUM)
{
break;//too many parts ignore
}
}
}
line = strtok_r(NULL, delim, &strtok_tmp_ptr);
}
}
}
else
{
perror(FILE_DISC_PARTS_CHECK);
}
return part_num;
}
static void CLEAR_DEV(void)
{
SCSI_USB_DEV * cur_dev = f_first_dev;
SCSI_USB_DEV * tmp_dev;
while (cur_dev)
{
tmp_dev = cur_dev;
cur_dev = cur_dev->next_dev;
free(tmp_dev);
}
f_first_dev = NULL;
}
//
static int find_device()
{//搜索设备加入列表
char buf[1024];
int fd;
int len;
int dev_num = 0;
char * seek = NULL;
SCSI_USB_DEV * new_dev;
//clear exist device
CLEAR_DEV();
//add new device
fd = open(FILE_DEV_CHECK, O_RDONLY);
if( fd > 0 )
{
len = read(fd, buf, sizeof(buf));
close(fd);
if ( len > 0 )
{
//printf("%d\n", len);
seek = buf;
while(seek)
{
seek = strstr(seek, "Host: scsi");
if (seek)
{
seek += strlen( "Host: scsi");
seek = strstr(seek, "Type:");
if (seek)
{
seek += strlen("Type:");
while(*seek == ' ') seek++;
new_dev = malloc(sizeof(SCSI_USB_DEV));
INIT_DEV(new_dev, dev_num, seek);
ADD_DEV(new_dev);
dev_num ++;
}
}
}
DBG_PRINT(("dev_num = %d\n", dev_num));
}
}
else
{
perror(FILE_DEV_CHECK);
}
return dev_num;
}
static int check_attach(SCSI_USB_DEV * dev)
{//检测设备是否连接
//linux中只要设备被插入过就会记住该设备
//只能通过Attached来判断是否连接
char buf[512];
int fd;
int len;
char * seek;
fd = open(dev->file_statu, O_RDONLY);
if( fd > 0 )
{
len = read(fd, buf, sizeof(buf));
close(fd);
if ( len > 0 )
{
seek = strstr(buf, "Attached:");
if (seek)
{
seek += strlen( "Attached:");
while(*seek == ' ') seek++;
return *seek=='Y';
}
}
}
else
{
perror(dev->file_statu);
}
return 0;
}
static int check_mount(SCSI_USB_DEV * dev)
{
char buf[1024];
int fd;
int len;
char * seek;
int i = 0;
fd = open(FILE_MOUNT_CHECK, O_RDONLY);
if( fd > 0 )
{
len = read(fd, buf, sizeof(buf));
close(fd);
if ( len > 0 )
{
buf[len] = '\0';
if(dev->type == 2 && dev->part_num > 1) i ++; /*if disk ignore first part disc*/
for(; i
{
//printf("index=%d type=%d %s\n",dev->index,dev->type,dev->devfile_parts[i]);
seek = strstr(buf, dev->devfile_parts[i]);
if (seek!=NULL) return 1;/*have one part mounted return 1*/
}
}
}
else
{
perror(FILE_MOUNT_CHECK);
}
return 0;
}
static int do_mount(SCSI_USB_DEV * dev)
{//自动mount 有进行vcd 和 cd的检查并用 cdfs mount
int i = 0;
char fstype[10];
unsigned long mountflags=0;
char mount_data[30];
char tmpdir[50];
int mount_ok = 0;
int is_vcd = 0;
char check_cmd[50];
if(dev->type == 1 && is_manual_umount == 0)
{
//mkdir(dev->mount_path[0], 0777);
strcpy(fstype, "iso9660");
mountflags= 0xc0ed0000 |MS_RDONLY ;
strcpy(mount_data,"codepage=936,iocharset=gb2312");
if (mount(dev->devfile_parts[0], dev->mount_path[0], fstype ,mountflags, mount_data)== 0)
{
mount_ok = 1;
DBG_PRINT2(("mount -t %s %s %s success\n", fstype, dev->devfile_parts[0], dev->mount_path[0]));
//check is vcd
sprintf(check_cmd,"ls %s/vcd/*.vcd", dev->mount_path[0]);
is_vcd = (system(check_cmd) == 0);
if (is_vcd)
{
if (umount(dev->mount_path[0]) == 0)
{
DBG_PRINT2(("umount %s success(vcd iso9660)\n", dev->devfile_parts[0]));
}
else
{
is_vcd = 0;
DBG_PRINT2(("umount %s failed (vcd iso9660)\n", dev->devfile_parts[0]));
}
}
}
else
{
mount_ok = 0;
}
if (mount_ok == 0 || is_vcd)
{
DBG_PRINT2(("mount -t %s %s %s failed, try cdfs\n", fstype, dev->devfile_parts[0], dev->mount_path[0]));
strcpy(fstype, "cdfs");
if (mount(dev->devfile_parts[0], dev->mount_path[0], fstype ,mountflags, mount_data)== 0)
{
DBG_PRINT2(("mount -t %s %s %s success\n", fstype, dev->devfile_parts[0], dev->mount_path[0]));
return 1;
}
else
{
DBG_PRINT2(("mount -t %s %s %s failed, try cdfs\n", fstype, dev->devfile_parts[0], dev->mount_path[0]));
return 0;
}
}
}
else if (dev->type == 2)
{
sprintf(tmpdir, USB_DISK_MP"/disk%d", dev->index);
mkdir(tmpdir, 0777);
strcpy(fstype, "vfat");
mountflags= 0xc0ed0000;
strcpy(mount_data,"codepage=936,iocharset=gb2312");
if (dev->part_num > 1)
i ++; /*if disk ignore first part disc*/
for(; i
{
mkdir(dev->mount_path[i], 0777);
if (mount(dev->devfile_parts[i], dev->mount_path[i], fstype ,mountflags, mount_data)== 0)
{
DBG_PRINT2(("mount %s %s success\n", dev->devfile_parts[i], dev->mount_path[i]));
Do_USB_Disk_Update(dev->mount_path[i]);
}
else
{
rmdir(dev->mount_path[i]);
DBG_PRINT2(("mount %s %s failed\n", dev->devfile_parts[i], dev->mount_path[i]));
}
}
}
else
{
return 0;
}
return 1;
}
static int do_umount(SCSI_USB_DEV * dev)
{
int i = 0;
char tmpdir[50];
if (dev->type == 1)
{//cdrom
if (umount(dev->mount_path[0]) == 0)
{
DBG_PRINT2(("umount %s success\n", dev->devfile_parts[0]));
return 1;
}
else
{
DBG_PRINT2(("umount %s failed\n", dev->devfile_parts[0]));
return 0;
}
}
else if(dev->type == 2)
{
if (dev->part_num > 1)
i ++; /*if disk ignore first part disc*/
for(; i
{
if (umount(dev->mount_path[i]) == 0)
{
DBG_PRINT2(("umount %s success\n", dev->devfile_parts[i]));
remove(dev->mount_path[i]);
}
else
{
DBG_PRINT2(("umount %s failed\n", dev->devfile_parts[i]));
}
}
sprintf(tmpdir, USB_DISK_MP"/disk%d", dev->index);
remove(tmpdir);
}
return 1;
}
static int process_dev(SCSI_USB_DEV * dev)
{
if (check_attach(dev))//检测设备是否插上
{
if (!check_mount(dev))//检测设备是否mount上了
{
do_mount(dev);
}
}
else
{
if (check_mount(dev))
{
do_umount(dev);
}
}
return 1;
}
void manual_umount(void);
void manual_umount()//争对光驱进行umount
{
/* now only umount cdrom*/
SCSI_USB_DEV * cur_dev = NULL;
cur_dev = f_first_dev;
while (cur_dev)
{
if (cur_dev->type == 1 ) break;
cur_dev = cur_dev->next_dev;
}
if (cur_dev != NULL)
{
is_manual_umount = 1;
if (check_mount(cur_dev))
{
if (do_umount(cur_dev))
{
set_ALERT_Msg("光驱卸载成功");
}
}
}
}
void manual_mount(void);
void manual_mount()//争对光驱进行mount
{
/* now only umount cdrom*/
SCSI_USB_DEV * cur_dev = NULL;
cur_dev = f_first_dev;
while (cur_dev)
{
if (cur_dev->type == 1 ) break;
cur_dev = cur_dev->next_dev;
}
if (cur_dev != NULL)
{
is_manual_umount = 0;
if (!check_mount(cur_dev))
{
do_mount(cur_dev);
}
}
}
#ifndef DBG
int Init_AutoMounter(void);
int Init_AutoMounter()
{
int ret;
pthread_t thread_automounter;
ret = pthread_create(&thread_automounter, NULL, (void *) main_thread, NULL);
if(ret != 0){
printf ("Create pthread error!\n");
}
return ret;
}
static void * main_thread(void)
#else
int main()
#endif
{
SCSI_USB_DEV * cur_dev = NULL;
mkdir(USB_DISK_MP, 0777);
mkdir(USB_CDROM_MP, 0777);
while (1)
{
find_device();//查找设备 初始化设备列表
cur_dev = f_first_dev;
while (cur_dev)
{
process_dev(cur_dev);//对每个设备进行处理
cur_dev = cur_dev->next_dev;
}
sleep(10);//10秒钟检测一次
//对于u盘和移动硬盘定时检测并自动mount和umount
}
}
/*
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: BENQ Model: DVD-ROM 16X Rev: A.DD
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: FUJITSU Model: MHT2040AH Rev: 0000
Type: Direct-Access ANSI SCSI revision: 02
*/
//char ** USB_DEVS_STATU= { "/proc/scsi/usb-storage-0/0",""};
///proc/scsi/usb-storage-1/1
///dev/scsi/host0/bus0/target0/lun0/cd
