~3TB ext4 volume not read correctly by ext2-fs driver in GRUB2

[Tony Vroon]

Ladies and gentlemen,

It would appear that the ext2-fs driver is not reliably able to read
directories on my ~3TB / filesystem:
/dev/root             3.4T  1.7T  1.6T  52% /
/dev/root on / type ext4 (rw,noatime,barrier=1,data=ordered)

Whilst doing some troubleshooting over IRC, I was given a debug patch.
With this patch applied, I'll show you a working directory entry (/etc)
and a non-working directory entry (/boot):
prometheus ~ # grub-fstest -d ext2 -v /dev/sda3 ls /etc
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:651: iterating inode size=4096 mode=0x41ed
fs/ext2.c:688: got filename: '.', type 2
fs/ext2.c:862: grub_fshelp_dir returning: 0
fs/ext2.c:651: iterating inode size=4096 mode=0x41ed
fs/ext2.c:688: got filename: '.', type 2
fs/ext2.c:688: got filename: '..', type 2
fs/ext2.c:688: got filename: 'lost+found', type 2
fs/ext2.c:688: got filename: 'lib', type 7
fs/ext2.c:688: got filename: '.config', type 1
fs/ext2.c:688: got filename: 'sbin', type 2
fs/ext2.c:688: got filename: 'root', type 2
fs/ext2.c:688: got filename: 'mnt', type 2
fs/ext2.c:688: got filename: 'opt', type 2
fs/ext2.c:688: got filename: 'var', type 2
fs/ext2.c:688: got filename: 'usr', type 2
fs/ext2.c:688: got filename: 'dev', type 2
fs/ext2.c:688: got filename: 'lib32', type 2
fs/ext2.c:688: got filename: 'home', type 2
fs/ext2.c:688: got filename: 'tmp', type 2
fs/ext2.c:688: got filename: 'media', type 2
fs/ext2.c:688: got filename: 'sys', type 2
fs/ext2.c:688: got filename: 'cvs', type 2
fs/ext2.c:688: got filename: 'proc', type 2
fs/ext2.c:688: got filename: 'etc', type 2
fs/ext2.c:651: iterating inode size=0 mode=0x0
fs/ext2.c:862: grub_fshelp_dir returning: 0

prometheus ~ # grub-fstest -d ext2 -v /dev/sda3 ls /boot
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:862: grub_fshelp_dir returning: 9
fs/ext2.c:651: iterating inode size=4096 mode=0x41ed
fs/ext2.c:688: got filename: '.', type 2
fs/ext2.c:862: grub_fshelp_dir returning: 0
fs/ext2.c:651: iterating inode size=4096 mode=0x41ed
fs/ext2.c:688: got filename: '.', type 2
fs/ext2.c:688: got filename: '..', type 2
fs/ext2.c:688: got filename: 'lost+found', type 2
fs/ext2.c:688: got filename: 'lib', type 7
fs/ext2.c:688: got filename: '.config', type 1
fs/ext2.c:688: got filename: 'sbin', type 2
fs/ext2.c:688: got filename: 'root', type 2
fs/ext2.c:688: got filename: 'mnt', type 2
fs/ext2.c:688: got filename: 'opt', type 2
fs/ext2.c:688: got filename: 'var', type 2
fs/ext2.c:688: got filename: 'usr', type 2
fs/ext2.c:688: got filename: 'dev', type 2
fs/ext2.c:688: got filename: 'lib32', type 2
fs/ext2.c:688: got filename: 'home', type 2
fs/ext2.c:688: got filename: 'tmp', type 2
fs/ext2.c:688: got filename: 'media', type 2
fs/ext2.c:688: got filename: 'sys', type 2
fs/ext2.c:688: got filename: 'cvs', type 2
fs/ext2.c:688: got filename: 'proc', type 2
fs/ext2.c:688: got filename: 'etc', type 2
fs/ext2.c:688: got filename: 'lib64', type 2
fs/ext2.c:688: got filename: 'boot', type 2
fs/ext2.c:651: iterating inode size=0 mode=0x0
fs/ext2.c:862: grub_fshelp_dir returning: 0

In order to help troubleshoot this, I can apply patches on top of
current SVN, run fstest & test booting for you. Please note that making
images of a 3TB drive is not practical and will not reflect the real
situation to you.
Sorry, but I am not comfortable offering SSH access to random internet
strangers.

Regards,
Tony V.

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