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Bug #3401

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mount(8) doesn't detect filesystem type in raw GPT partition

Added by liweitianux about 2 hours ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
Userland
Target version:
6.6
Start date:
02/23/2026
Due date:
% Done:

0%

Estimated time:

Description

mount(8) tries to guess/detect the FS type for a partition within a BSD disklabel. However, it doesn't guess the FS type for a raw GPT partition, e.g.,

% sudo gpt show vn4
Disk vn4: 2048MB (4194304 512-byte sectors)
    Start  Sectors    Size  Index  Contents
        0        1    512B      -  PMBR
        1        1    512B      -  Pri GPT header
        2       32  16.0KB      -  Pri GPT table
       34     2014  1007KB      -  Unused
     2048  2000896   977MB      0  GPT part - EFI System
  2002944  2191327  1070MB      -  Unused
  4194271       32  16.0KB      -  Sec GPT table
  4194303        1    512B      -  Sec GPT header

% sudo newfs_msdos vn4s0
/dev/vn4s0: 2000352 sectors in 62511 FAT16 clusters (16384 bytes/cluster)
BytesPerSec=512 SecPerClust=32 ResSectors=1 FATs=2 RootDirEnts=512 Media=0xf0 FATsecs=245 SecPerTrack=32 Heads=64 HiddenSecs=0 HugeSectors=2000896

% sudo mount /dev/vn4s0 /mnt/tmp
mount: warning: fstype in disklabel not set to anything I understand
attempting to mount with -t ufs
mount_ufs: /dev/vn4s0 on /mnt/tmp: incorrect super block

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