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[ Upstream commit2c2b67af5f] In the old mount proceedure, hostfs could only pass root directory during boot. This is because it constructed the root directory using the @root_ino event without any mount options. However, when using it with the new mount API, this step is no longer triggered. As a result, if users mounts without specifying any mount options, the @host_root_path remains uninitialized. To prevent this issue, the @host_root_path should be initialized at the time of allocation. Reported-by: Geoffrey Thorpe <geoff@geoffthorpe.net> Closes: https://lore.kernel.org/all/643333a0-f434-42fb-82ac-d25a0b56f3b7@geoffthorpe.net/ Fixes:cd140ce9f6("hostfs: convert hostfs to use the new mount API") Signed-off-by: Hongbo Li <lihongbo22@huawei.com> Link: https://patch.msgid.link/20251011092235.29880-1-lihongbo22@huawei.com Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>