> > -	error = -EPERM;
quoted text
> > -	if (IS_APPEND(inode))
> > -		goto mnt_drop_write_and_out;
> > -
> >  	error = get_write_access(inode);
> >  	if (error)
> >  		goto mnt_drop_write_and_out;
> 
> errno change and worse than that - we
> 	a) get different errno with append-only file mmaped shared
> 	b) break_lease() happening, despite the file being append-only
> 
> > @@ -321,10 +317,6 @@ static long do_sys_ftruncate(unsigned in
> >  	if (small && length > MAX_NON_LFS)
> >  		goto out_putf;
> >  
> > -	error = -EPERM;
> > -	if (IS_APPEND(inode))
> > -		goto out_putf;
> > -
> >  	error = locks_verify_truncate(inode, file, length);
> 
> Again, errno change...
> 
> > @@ -1639,8 +1639,6 @@ int may_open(struct nameidata *nd, int a
> >  	if (IS_APPEND(inode)) {
> >  		if  ((flag & FMODE_WRITE) && !(flag & O_APPEND))
> >  			return -EPERM;
> > -		if (flag & O_TRUNC)
> > -			return -EPERM;
> >  	}
> 
> Bogus break_lease() following that...
> 

OK, I'll drop this patch.  Truncate is weird, it should really have a
separate i_op/f_op.

Miklos
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