From ffb24e3c657869b256c3f90792d262fe09f49628 Mon Sep 17 00:00:00 2001 From: Amir Goldstein Date: Tue, 27 Apr 2021 13:28:26 +0300 Subject: ovl: relax lookup error on mismatch origin ftype We get occasional reports of lookup errors due to mismatched origin ftype from users that re-format a lower squashfs image. Commit 13c6ad0f45fd ("ovl: document lower modification caveats") tries to discourage the practice of re-formating lower layers and describes the expected behavior as undefined. Commit b0e0f69731cd ("ovl: restrict lower null uuid for "xino=auto"") limits the configurations in which origin file handles are followed. In addition to these measures, change the behavior in case of detecting a mismatch origin ftype in lookup to issue a warning, not follow origin, but not fail the lookup operation either. That should make overall more users happy without any big consequences. Link: https://lore.kernel.org/linux-unionfs/CAOQ4uxgPq9E9xxwU2CDyHy-_yCZZeymg+3n+-6AqkGGE1YtwvQ@mail.gmail.com/ Signed-off-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/overlayfs/namei.c') diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index da063b18b419..1a9b515fc45d 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -392,7 +392,7 @@ invalid: upperdentry, d_inode(upperdentry)->i_mode & S_IFMT, d_inode(origin)->i_mode & S_IFMT); dput(origin); - return -EIO; + return -ESTALE; } static int ovl_check_origin(struct ovl_fs *ofs, struct dentry *upperdentry, -- cgit v1.2.3