Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1726768

Changing FAT label of mounted file system

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Hello!

On most file system it is possible to change its label at anytime, when 
mounted or unmounted. But FAT is such special file system on which is 
label stored in two location, plus one is in directory structure (which 
cannot be modified when file system is mounted).

I would like to ask what about providing FAT specific IOCTL for vfat 
kernel driver which would allow to change volume label?

Currently vfat provides FAT_IOCTL_GET_VOLUME_ID which returns volume 
serial number, so in similar way it could be extended to provide 
FAT_IOCTL_GET_VOLUME_LABEL and FAT_IOCTL_SET_VOLUME_LABEL.

Now when partition manager program wants to change label of FAT 
partition, it first needs to unmount it, then change label and after 
that mount it again. Providing IOCTL would help partition manager 
programs to implement operation for changing volume label easier. Also 
unmounting partition is now always possible (when busy).

Next typical usage is opening file manager and in its window "renaming" 
volume label. Currently such thing is not possible to implement (without 
hacks) for FAT as once file manager has opened location of FAT partition 
it needs to be mounted -- and changing volume label is not possible.

Other file systems do not have this problem as label is not stored in 
directory structure, managed by kernel driver.

-- 
Pali Rohár
pali.rohar@gmail.com

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Changing FAT label of mounted file system Pali Rohár <pali.rohar@gmail.com> - 2017-09-05 16:20 +0200
  Re: Changing FAT label of mounted file system OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> - 2017-09-05 18:10 +0200

csiph-web