target: Perform PROTECT sanity checks for WRITE_SAME

This patch adds a call to sbc_check_prot() within sbc_setup_write_same()
code to perform the various protection releated sanity checks, including
failing if WRPROTECT or RDPROTECT is set for a backend device that has
not advertised support for T10-PI.

Also, since WRITE_SAME + T10-PI is currently not supported by IBLOCK +
FILEIO backends, go ahead and fail if ->execute_write_same() is invoked
with a non zero cmd->prot_op.

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 1bb8b4a93a66..87cbbe220151 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -37,6 +37,9 @@
 #include "target_core_alua.h"
 
 static sense_reason_t
+sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
+
+static sense_reason_t
 sbc_emulate_readcapacity(struct se_cmd *cmd)
 {
         struct se_device *dev = cmd->se_dev;
@@ -254,6 +257,7 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
         struct se_device *dev = cmd->se_dev;
         sector_t end_lba = dev->transport->get_blocks(dev) + 1;
         unsigned int sectors = sbc_get_write_same_sectors(cmd);
+        sense_reason_t ret;
 
         if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
                 pr_err("WRITE_SAME PBDATA and LBDATA"
@@ -295,6 +299,10 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
         if (!ops->execute_write_same)
                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 
+        ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
+        if (ret)
+                return ret;
+
         cmd->execute_cmd = ops->execute_write_same;
         return 0;
 }