[PATCH v5 0/2] 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.

v5:
1. find the volume label entry through the scan function.
2. the volume label only retains the d-characters (reference from Ecma-107).

v4:
1. read/write volume label from/to the location of the respective version.
2. correct volume label check reference from mkfs.fat.
3. fixed some code issue.

v3:
1. write volume label both boot sector and root directory.

v2:
1. add filesystem version check.
2. add diretory permissions check.
3. add volume label string check.
4. fixed part of return value.
5. fixed some indent issue.
6. remove sync_dirty_buffer().

ChenGuanqiao (2):
  fs: fat: Add fat filesystem partition volume label in local structure
  fs: fat: add ioctl method in fat filesystem driver

 fs/fat/dir.c                  |  29 +++++++++++
 fs/fat/fat.h                  |   2 +
 fs/fat/file.c                 | 116 ++++++++++++++++++++++++++++++++++++++++++
 fs/fat/inode.c                |  15 ++++--
 include/uapi/linux/msdos_fs.h |   2 +
 5 files changed, 161 insertions(+), 3 deletions(-)

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2.11.0