[POWERPC] spufs: Respect RLIMIT_CORE in spu coredump code

Currently the spu coredump code doesn't respect the ulimit, it should.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/spufs/coredump.c

@@ -53,8 +53,12 @@ static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
  */
 static int spufs_dump_write(struct file *file, const void *addr, int nr, loff_t *foffset)
 {
+	unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
 	ssize_t written;
 
+	if (*foffset + nr > limit)
+		return -EIO;
+
 	written = file->f_op->write(file, addr, nr, &file->f_pos);
 	*foffset += written;