return errno_to_blk_status(err);
}
+static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd)
+{
+ struct nullb_device *dev = cmd->nq->dev;
+ struct bio *bio;
+
+ if (dev->memory_backed)
+ return;
+
+ if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ) {
+ zero_fill_bio(cmd->bio);
+ } else if (req_op(cmd->rq) == REQ_OP_READ) {
+ __rq_for_each_bio(bio, cmd->rq)
+ zero_fill_bio(bio);
+ }
+}
+
static inline void nullb_complete_cmd(struct nullb_cmd *cmd)
{
+ /*
+ * Since root privileges are required to configure the null_blk
+ * driver, it is fine that this driver does not initialize the
+ * data buffers of read commands. Zero-initialize these buffers
+ * anyway if KMSAN is enabled to prevent that KMSAN complains
+ * about null_blk not initializing read data buffers.
+ */
+ if (IS_ENABLED(CONFIG_KMSAN))
+ nullb_zero_read_cmd_buffer(cmd);
+
/* Complete IO by inline, softirq or timer */
switch (cmd->nq->dev->irqmode) {
case NULL_IRQ_SOFTIRQ: