tree 830407d827ce9d19683c2e5bf1c9130cbbaf951f
parent cf30a0518a5944e7af7c38a04af145c8e5e975e8
author Alex Henrie <alexhenrie24@gmail.com> 1707358892 -0700
committer Vegard Nossum <vegard.nossum@oracle.com> 1717059644 +0000

isofs: handle CDs with bad root inode but good Joliet root directory

[ Upstream commit 4243bf80c79211a8ca2795401add9c4a3b1d37ca ]

I have a CD copy of the original Tom Clancy's Ghost Recon game from
2001. The disc mounts without error on Windows, but on Linux mounting
fails with the message "isofs_fill_super: get root inode failed". The
error originates in isofs_read_inode, which returns -EIO because de_len
is 0. The superblock on this disc appears to be intentionally corrupt as
a form of copy protection.

When the root inode is unusable, instead of giving up immediately, try
to continue with the Joliet file table. This fixes the Ghost Recon CD
and probably other copy-protected CDs too.

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240208022134.451490-1-alexhenrie24@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit b02e6ba55997926c961a95cdaf9de91f75b0b5c3)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>