unionfs_permission does this
err = permission(hidden_inode, mask, nd);
/* If the leftmost branch is r/o we can't copyup.
* Otherwise we ignore EROFS. */
if (IS_COPYUP_ERR(err) && (bindex != 0))
err = inode_permission(hidden_inode, mask, nd);
since inode_permission seems to bascially be the samething as
permission, what exactly is the point of this? as nothing changes b/w
the calls?
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