[PATCH v8 0/3] fs: fat: add ioctl to modify fat filesystem partion volume label

[ChenGuanqiao <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.

v8:
1. struct msdos_sb_info reduction.
2. remove MSDOS_ROOT_INO check in label entry search.
3. replace uppercase in the label with lowercase, like windows.
4. put the copy_to_user() back into the lock.
5. delete unnecessary lock.
v7...v1:
write the patch

ChenGuanqiao (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                  |   5 ++
 fs/fat/file.c                 | 132 ++++++++++++++++++++++++++++++++++++++++++
 fs/fat/inode.c                |   6 ++
 include/uapi/linux/msdos_fs.h |   2 +
 5 files changed, 192 insertions(+)

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2.11.0