From d0a91295557666f9e58b79b5177a98229007803b Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Sat, 14 Feb 2015 01:56:19 +0000 Subject: [PATCH] target: Fail WRITE_SAME w/ UNMAP=1 when emulate_tpws=0 This patch adds a check within sbc_setup_write_same() to fail a WRITE_SAME w/ UNMAP=1 op, if the backend device has emulate_tpws disabled. Cc: Martin Petersen Cc: Christoph Hellwig Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_sbc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 856e800926b8..0d307c34f08e 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -293,6 +293,11 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o if (!ops->execute_write_same_unmap) return TCM_UNSUPPORTED_SCSI_OPCODE; + if (!dev->dev_attrib.emulate_tpws) { + pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" + " has emulate_tpws disabled\n"); + return TCM_UNSUPPORTED_SCSI_OPCODE; + } cmd->execute_cmd = ops->execute_write_same_unmap; return 0; } -- 2.34.1