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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. Commit13c6ad0f45
("ovl: document lower modification caveats") tries to discourage the practice of re-formating lower layers and describes the expected behavior as undefined. Commitb0e0f69731
("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 <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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@ -392,7 +392,7 @@ invalid:
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upperdentry, d_inode(upperdentry)->i_mode & S_IFMT,
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d_inode(origin)->i_mode & S_IFMT);
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dput(origin);
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return -EIO;
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return -ESTALE;
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}
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static int ovl_check_origin(struct ovl_fs *ofs, struct dentry *upperdentry,
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