I don't really understand the fingerprint idea. Files with the
same content will point to the same physical disk blocks, so that
should be a much better indicator than a finger print? Also how does
the fingerprint guarantee uniqueness? Is it a cryptographically
secure hash? In here it just seems like an opaque blob.
> +static inline int erofs_inode_set_aops(struct inode *inode,
> + struct inode *realinode, bool no_fscache)
Factoring this out first would be a nice little prep patch.
Also it would probably be much cleaner using IS_ENABLED.
> +static int erofs_ishare_file_open(struct inode *inode, struct file *file)
> +{
> + struct inode *sharedinode = EROFS_I(inode)->sharedinode;
Ok, it looks like this allocates a separate backing file and inode.
