vfs: ftruncate check IS_APPEND() on real upper inode
ftruncate an overlayfs inode was checking IS_APPEND() on overlay inode, but overlay inode does not have the S_APPEND flag. Check IS_APPEND() on real upper inode instead. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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