[gparted] Raise the maximum F2FS label size to 127 characters (!29)

[Mike Fleetwood <mfleetwo src gnome org>]

commit c9f47403b80f1e6abfc615772a79b97703828a3d
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sun Mar 17 13:40:45 2019 +0000

    Raise the maximum F2FS label size to 127 characters (!29)
    
    Fix to make mkfs.f2fs properly handle labels longer than 16 characters
    was included in f2fs-tools 1.2.0 [1].  The oldest supported
    distributions now include this release:
      Distro             EOL        f2fs-tools
    - Debian 8           2020-Jun   1.4.0
    - RHEL / CentOS 7    2024-Jun   1.4.1
    - SLES 12            2027-Oct   Unknown
    - Ubuntu 14.04 LTS   2019-Apr   1.2.0
    
    Note that on Ubuntu 14.04 LTS blkid from util-linux 2.20.1 is too old to
    recognise F2FS file systems, as 2.23 is required for F2FS support [2].
    
    mkfs.f2fs claims the maximum label length is less than 512 characters,
    but actually accepts 512 characters.
    
        # label=`head -c 1024 < /dev/zero | tr '\0' 'A'`
        # mkfs.f2fs -l `echo -n "$label" | cut -c1-513` /dev/sdb10
    
                F2FS-tools: mkfs.f2fs Ver: 1.4.0 (2014-09-18)
    
        Error: Volume Label should be less than      512 characters
    
        Usage: mkfs.f2fs [options] device [sectors]
        [options]:
          -a heap-based allocation [default:1]
          -d debug level [default:0]
          -e [extension list] e.g. "mp3,gif,mov"
          -l label
          -o overprovision ratio [default:5]
          -s # of segments per section [default:1]
          -z # of sections per zone [default:1]
          -t 0: nodiscard, 1: discard [default:1]
        sectors: number of sectors. [default: determined by device size]
        # echo $?
        1
    
        # mkfs.f2fs -l `echo -n "$label" | cut -c1-512` /dev/sdb10
    
                F2FS-tools: mkfs.f2fs Ver: 1.4.0 (2014-09-18)
    
        Info: Label = AAAAAAAAAAAA...[trimmed from 512 "A"s]...AAAAAAAAAAAA
        Info: sector size = 512
        Info: total sectors = 1048576 (in 512bytes)
        Info: zone aligned segment0 blkaddr: 256
        Info: Discarding device
        Info: This device doesn't support TRIM
        Info: format successful
        # echo $?
        0
    
        # blkid -V
        blkid from util-linux 2.25.2  (libblkid 2.25.0, 24-Oct-2014)
        # blkid /dev/sdb
        /dev/sdb10: LABEL="AAAAAAAAAAAA...[only 127 "A"s]...AAAAAAAAAAAA"
        UUID="f47f3fdc-dd91-4616-bb6d-0d643a884265" TYPE="f2fs"
        PARTUUID="3bb4bef8-9494-4e82-8dda-5d8edd9c60d9"
    
    As blkid only reports the first 127 characters and is the only command
    used for reading the label of an F2FS file system, use this as the new
    increased limit.
    
    [1] 
https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git/commit/?id=9799d6364dc93e1fd259d812d4a50ed984a6456b
        mkfs: handle labels longer than 16 characters
    
    [2] https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.23/v2.23-ReleaseNotes
        "add Flash-Friendly File System (f2fs) support  [Alejandro Martinez
        Ruiz]"
    
    Closes !29 - Enhance F2FS support

 src/Utils.cc | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/src/Utils.cc b/src/Utils.cc
index 7b38f191..5833f9e1 100644
--- a/src/Utils.cc
+++ b/src/Utils.cc
@@ -198,11 +198,9 @@ int Utils::get_filesystem_label_maxlength( FSType filesystem )
                case FS_EXT2            : return 16 ;
                case FS_EXT3            : return 16 ;
                case FS_EXT4            : return 16 ;
-               //mkfs.f2fs says that it can create file systems with labels up to 512
-               //  characters, but it core dumps with labels of 29 characters or larger!
-               //  Also blkid only correctly displays labels up to 19 characters.
-               //  (Suspect it is all part of a memory corruption bug in mkfs.f2fs).
-               case FS_F2FS            : return 19 ;
+               // mkfs.f2fs supports labels up to 512 characters, however only blkid is
+               // used to read the label and that only displays the first 127 characters.
+               case FS_F2FS            : return 127;
                case FS_FAT16           : return 11 ;
                case FS_FAT32           : return 11 ;
                //mkfs.hfsplus can create hfs and hfs+ file systems with labels up to 255