[PATCH v4 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
data region (FAT32), root directory (FAT12, FAT16). Thus, the boot sector just
needs to be upgrade when the label writing.

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/fat.h                  |   1 +
 fs/fat/file.c                 | 133 ++++++++++++++++++++++++++++++++++++++++++
 fs/fat/inode.c                |  15 ++++-
 include/uapi/linux/msdos_fs.h |   2 +
 4 files changed, 148 insertions(+), 3 deletions(-)

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2.11.0