[PATCH 0/2] fs: fat: add ioctl method to read voluem label in fat filesystem driver

[chenchacha <chen.chenchacha@foxmail.com>]

This patch add fat ioctl command FAT_IOCTL_GET_VOLUME_LABEL.

We can get the volume label with this command:

	ioctl(fd, FAT_IOCTL_GET_VOLUME_LABEL, &volume_label);

FAT volume label (volume name) is exactly same stored in boot sector and root
directory. And this patch read label only from the root directory. If label in
root directory is missing then disk would be treated as without label. Label
from boot sector would not be read.

The volume label format reference from Pali Rohár testing results
(https://www.spinics.net/lists/kernel/msg2645732.html) in the previous mail.

chenchacha (2):
  Add FAT_IOCTL_GET_VOLUME_LABEL in fat_generic_ioctl()
  Add a new function to get root directory with ATTR_VOLUME

 fs/fat/dir.c                  | 13 +++++++++++++
 fs/fat/fat.h                  |  2 ++
 fs/fat/file.c                 | 22 ++++++++++++++++++++++
 include/uapi/linux/msdos_fs.h |  1 +
 4 files changed, 38 insertions(+)

-- 
2.19.0