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>
int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
{
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);
return 0;
}
EXPORT_SYMBOL(se_dev_set_emulate_dpo);
int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
{
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);
return 0;
}
EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
dev->dev_attrib.da_dev = dev;
dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
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;
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;
* for SCSI WRITEs with Forced Unit Access (FUA) set.
* Allow this to happen independent of WCE=0 setting.
*/
* 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;
loff_t start = cmd->t_task_lba *
dev->dev_attrib.block_size;
loff_t end;
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);
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 *);
/* target_core_stat.c */
void target_stat_setup_dev_default_groups(struct se_device *);
sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
{
if (cdb[1] & 0x10) {
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) {
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]);
pr_err("Got CDB: 0x%02x with FUA bit set, but device"
" does not advertise support for FUA write\n",
cdb[0]);
buf[5] = 0x07;
/* If WriteCache emulation is enabled, set V_SUP */
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);
buf[6] = 0x01;
/* If an LBA map is present set R_SUP */
spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
- if (se_dev_check_wce(dev))
+ if (target_check_wce(dev))
p[2] = 0x04; /* Write Cache Enable */
p[12] = 0x20; /* Disabled Read Ahead */
p[2] = 0x04; /* Write Cache Enable */
p[12] = 0x20; /* Disabled Read Ahead */
(cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
spc_modesense_write_protect(&buf[length], type);
(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;
spc_modesense_dpofua(&buf[length], type);
++length;
return 0;
}
EXPORT_SYMBOL(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;
+}
#define DA_MAX_WRITE_SAME_LEN 0
/* Use a model alias based on the configfs backend device name */
#define DA_EMULATE_MODEL_ALIAS 0
#define DA_MAX_WRITE_SAME_LEN 0
/* Use a model alias based on the configfs backend device name */
#define DA_EMULATE_MODEL_ALIAS 0
-/* Emulation for Direct Page Out */
-#define DA_EMULATE_DPO 0
-/* Emulation for Forced Unit Access WRITEs */
-#define DA_EMULATE_FUA_WRITE 1
-/* Emulation for Forced Unit Access READs */
-#define DA_EMULATE_FUA_READ 0
/* Emulation for WriteCache and SYNCHRONIZE_CACHE */
#define DA_EMULATE_WRITE_CACHE 0
/* Emulation for UNIT ATTENTION Interlock Control */
/* Emulation for WriteCache and SYNCHRONIZE_CACHE */
#define DA_EMULATE_WRITE_CACHE 0
/* Emulation for UNIT ATTENTION Interlock Control */