fatfs: add FAT_IOCTL_GET_VOLUME_ID

This patch, originally from Android kernel, adds vfat ioctl command
FAT_IOCTL_GET_VOLUME_ID, with this command we can get the vfat volume ID
using following code:

	ioctl(fd, FAT_IOCTL_GET_VOLUME_ID, &volume_ID)

This patch is a modified version of the patch by Mike Lockwood, with
changes from Dmitry Pervushin, who noticed the original patch makes some
volume IDs abiguous with error returns: for example, if volume id is
0xFFFFFDAD, that matches -ENOIOCTLCMD, we get "FFFFFFFF" from the user
space.

So add a parameter to ioctl to get the correct volume ID.

Android uses vfat volume ID to identify different sd card, when a new sd
card is inserted to device, android can scan the media on it and pop up
new contents.
Signed-off-by: Bintian Wang <bintian.wang@linaro.org>
Cc: dmitry pervushin <dpervushin@gmail.com>
Cc: Mike Lockwood <lockwood@android.com>
Cc: Colin Cross <ccross@android.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Sean McNeil <sean@mcneil.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fat/fat.h

@@ -86,6 +86,7 @@ struct msdos_sb_info {
 	const void *dir_ops;	      /* Opaque; default directory operations */
 	int dir_per_block;	      /* dir entries per block */
 	int dir_per_block_bits;	      /* log2(dir_per_block) */
+	unsigned int vol_id;		/*volume ID*/
 
 	int fatent_shift;
 	struct fatent_operations *fatent_ops;

fs/fat/file.c

@@ -114,6 +114,12 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
 	return err;
 }
 
+static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
+{
+	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+	return put_user(sbi->vol_id, user_attr);
+}
+
 long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
@@ -124,6 +130,8 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return fat_ioctl_get_attributes(inode, user_attr);
 	case FAT_IOCTL_SET_ATTRIBUTES:
 		return fat_ioctl_set_attributes(filp, user_attr);
+	case FAT_IOCTL_GET_VOLUME_ID:
+		return fat_ioctl_get_volume_id(inode, user_attr);
 	default:
 		return -ENOTTY;	/* Inappropriate ioctl for device */
 	}

fs/fat/inode.c

@@ -1415,6 +1415,18 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 		brelse(fsinfo_bh);
 	}
 
+	/* interpret volume ID as a little endian 32 bit integer */
+	if (sbi->fat_bits == 32)
+		sbi->vol_id = (((u32)b->fat32.vol_id[0]) |
+					((u32)b->fat32.vol_id[1] << 8) |
+					((u32)b->fat32.vol_id[2] << 16) |
+					((u32)b->fat32.vol_id[3] << 24));
+	else /* fat 16 or 12 */
+		sbi->vol_id = (((u32)b->fat16.vol_id[0]) |
+					((u32)b->fat16.vol_id[1] << 8) |
+					((u32)b->fat16.vol_id[2] << 16) |
+					((u32)b->fat16.vol_id[3] << 24));
+
 	sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
 	sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
 

include/uapi/linux/msdos_fs.h

@@ -104,6 +104,8 @@ struct __fat_dirent {
 /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
 #define FAT_IOCTL_GET_ATTRIBUTES	_IOR('r', 0x10, __u32)
 #define FAT_IOCTL_SET_ATTRIBUTES	_IOW('r', 0x11, __u32)
+/*Android kernel has used 0x12, so we use 0x13*/
+#define FAT_IOCTL_GET_VOLUME_ID		_IOR('r', 0x13, __u32)
 
 struct fat_boot_sector {
 	__u8	ignored[3];	/* Boot strap short or near jump */
@@ -128,6 +130,10 @@ struct fat_boot_sector {
 			__u8	drive_number;	/* Physical drive number */
 			__u8	state;		/* undocumented, but used
 						   for mount state. */
+			__u8	signature;  /* extended boot signature */
+			__u8	vol_id[4];	/* volume ID */
+			__u8	vol_label[11];	/* volume label */
+			__u8	fs_type[8];		/* file system type */
 			/* other fiealds are not added here */
 		} fat16;
 
@@ -147,6 +153,10 @@ struct fat_boot_sector {
 			__u8	drive_number;   /* Physical drive number */
 			__u8    state;       	/* undocumented, but used
 						   for mount state. */
+			__u8	signature;  /* extended boot signature */
+			__u8	vol_id[4];	/* volume ID */
+			__u8	vol_label[11];	/* volume label */
+			__u8	fs_type[8];		/* file system type */
 			/* other fiealds are not added here */
 		} fat32;
 	};