target: fix DPO and FUA bit checks

Drivers may override the WCE flag, in which case the DPOFUA flag in
MODE SENSE might differ from the check used to reject invalid FUA
bits in sbc_check_dpofua.  Also now that we reject invalid FUA
bits early there is no need to duplicate the same buggy check
down in the fileio code.

As the DPOFUA flag controls th support for FUA bits on read and
write commands as well as DPO key off all the checks off a single
helper, and deprecate the emulate_dpo and emulate_fua_read attributs.

This fixes various failures in the libiscsi testsuite.

Personally I'd prefer to also remove the emulate_fua_write attribute
as there is no good reason to disable it, but I'll leave that for
a separate discussion.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

6 files changed, 40 insertions, 32 deletions

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index ce5f768..9ee194d 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -760,16 +760,8 @@ EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
 
 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 {
-	if (flag != 0 && flag != 1) {
-		pr_err("Illegal value %d\n", flag);
-		return -EINVAL;
-	}
-
-	if (flag) {
-		pr_err("dpo_emulated not supported\n");
-		return -EINVAL;
-	}
-
+	printk_once(KERN_WARNING
+		"ignoring deprecated emulate_dpo attribute\n");
 	return 0;
 }
 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
@@ -799,16 +791,8 @@ EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
 
 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 {
-	if (flag != 0 && flag != 1) {
-		pr_err("Illegal value %d\n", flag);
-		return -EINVAL;
-	}
-
-	if (flag) {
-		pr_err("ua read emulated not supported\n");
-		return -EINVAL;
-	}
-
+	printk_once(KERN_WARNING
+		"ignoring deprecated emulate_fua_read attribute\n");
 	return 0;
 }
 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
@@ -1513,9 +1497,9 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 
 	dev->dev_attrib.da_dev = dev;
 	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
-	dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
-	dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
-	dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
+	dev->dev_attrib.emulate_dpo = 1;
+	dev->dev_attrib.emulate_fua_write = 1;
+	dev->dev_attrib.emulate_fua_read = 1;
 	dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 	dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index fe6c19c..e865885 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -610,9 +610,7 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 		 * for SCSI WRITEs with Forced Unit Access (FUA) set.
 		 * Allow this to happen independent of WCE=0 setting.
 		 */
-		if (ret > 0 &&
-		    dev->dev_attrib.emulate_fua_write > 0 &&
-		    (cmd->se_cmd_flags & SCF_FUA)) {
+		if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
 			loff_t start = cmd->t_task_lba *
 				dev->dev_attrib.block_size;
 			loff_t end;
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 68bd7f5..75338c3 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -81,6 +81,8 @@ int	transport_clear_lun_ref(struct se_lun *);
 void	transport_send_task_abort(struct se_cmd *);
 sense_reason_t	target_cmd_size_check(struct se_cmd *cmd, unsigned int size);
 void	target_qf_do_work(struct work_struct *work);
+bool	target_check_wce(struct se_device *dev);
+bool	target_check_fua(struct se_device *dev);
 
 /* target_core_stat.c */
 void	target_stat_setup_dev_default_groups(struct se_device *);
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 3df2cd5..d441975 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -738,14 +738,15 @@ static int
 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
 {
 	if (cdb[1] & 0x10) {
-		if (!dev->dev_attrib.emulate_dpo) {
+		/* see explanation in spc_emulate_modesense */
+		if (!target_check_fua(dev)) {
 			pr_err("Got CDB: 0x%02x with DPO bit set, but device"
 			       " does not advertise support for DPO\n", cdb[0]);
 			return -EINVAL;
 		}
 	}
 	if (cdb[1] & 0x8) {
-		if (!dev->dev_attrib.emulate_fua_write || !se_dev_check_wce(dev)) {
+		if (!target_check_fua(dev)) {
 			pr_err("Got CDB: 0x%02x with FUA bit set, but device"
 			       " does not advertise support for FUA write\n",
 			       cdb[0]);
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 7912aa1..988c158 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -481,7 +481,7 @@ spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 	buf[5] = 0x07;
 
 	/* If WriteCache emulation is enabled, set V_SUP */
-	if (se_dev_check_wce(dev))
+	if (target_check_wce(dev))
 		buf[6] = 0x01;
 	/* If an LBA map is present set R_SUP */
 	spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
@@ -888,7 +888,7 @@ static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
 	if (pc == 1)
 		goto out;
 
-	if (se_dev_check_wce(dev))
+	if (target_check_wce(dev))
 		p[2] = 0x04; /* Write Cache Enable */
 	p[12] = 0x20; /* Disabled Read Ahead */
 
@@ -1000,8 +1000,12 @@ static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
 	     (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
 		spc_modesense_write_protect(&buf[length], type);
 
-	if ((se_dev_check_wce(dev)) &&
-	    (dev->dev_attrib.emulate_fua_write > 0))
+	/*
+	 * SBC only allows us to enable FUA and DPO together.  Fortunately
+	 * DPO is explicitly specified as a hint, so a noop is a perfectly
+	 * valid implementation.
+	 */
+	if (target_check_fua(dev))
 		spc_modesense_dpofua(&buf[length], type);
 
 	++length;
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 105f4fd..231812d 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3075,3 +3075,22 @@ int transport_generic_handle_tmr(
 	return 0;
 }
 EXPORT_SYMBOL(transport_generic_handle_tmr);
+
+bool
+target_check_wce(struct se_device *dev)
+{
+	bool wce = false;
+
+	if (dev->transport->get_write_cache)
+		wce = dev->transport->get_write_cache(dev);
+	else if (dev->dev_attrib.emulate_write_cache > 0)
+		wce = true;
+
+	return wce;
+}
+
+bool
+target_check_fua(struct se_device *dev)
+{
+	return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
+}