[PATCH v9 0/3] fs: fat: add ioctl to modify fat filesystem partion volume label

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

The FAT filesystem partition volume label can be read with
FAT_IOCTL_GET_VOLUME_LABEL and written with FAT_IOCTL_SET_VOLUME_LABEL.

FAT volume label (volume name) is exactly same stored in boot sector and root
directory. Thus, the boot sector just needs to be upgrade when the label
writing.

And, Ignore the volume label in struct msdos_sb_info.

The volume label format reference from Pali Rohár <pali.rohar@gmail.com> testing
results in the previous mail.

v9:
1. Add necessary lock to protect write method.
2. Fix some code bug.

v8...v1:
write the patch

Chen Guanqiao (3):
  fs: fat: Add fat filesystem partition volume label in local structure
  fs: fat: Add volume label entry method function
  fs: fat: add ioctl method in fat filesystem driver

 fs/fat/dir.c                  |  47 ++++++++++++++
 fs/fat/fat.h                  |   6 ++
 fs/fat/file.c                 | 145 ++++++++++++++++++++++++++++++++++++++++++
 fs/fat/inode.c                |   6 ++
 include/uapi/linux/msdos_fs.h |   2 +
 5 files changed, 206 insertions(+)

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2.14.3