#define SCSI_DEBUG_OPT_TRANSPORT_ERR 16
#define SCSI_DEBUG_OPT_DIF_ERR 32
#define SCSI_DEBUG_OPT_DIX_ERR 64
+#define SCSI_DEBUG_OPT_MAC_TIMEOUT 128
/* When "every_nth" > 0 then modulo "every_nth" commands:
* - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
* - a RECOVERED_ERROR is simulated on successful read and write
scsi_debug_every_nth = -1;
if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
return 0; /* ignore command causing timeout */
+ else if (SCSI_DEBUG_OPT_MAC_TIMEOUT & scsi_debug_opts &&
+ scsi_medium_access_command(SCpnt))
+ return 0; /* time out reads and writes */
else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
inj_recovered = 1; /* to reads and writes below */
else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_host.h>
else if (host->hostt->eh_timed_out)
rtn = host->hostt->eh_timed_out(scmd);
+ scmd->result |= DID_TIME_OUT << 16;
+
if (unlikely(rtn == BLK_EH_NOT_HANDLED &&
- !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
- scmd->result |= DID_TIME_OUT << 16;
+ !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)))
rtn = BLK_EH_HANDLED;
- }
return rtn;
}
int cmnd_size, int timeout, unsigned sense_bytes)
{
struct scsi_device *sdev = scmd->device;
+ struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
struct Scsi_Host *shost = sdev->host;
DECLARE_COMPLETION_ONSTACK(done);
unsigned long timeleft;
}
scsi_eh_restore_cmnd(scmd, &ses);
+
+ if (sdrv->eh_action)
+ rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn);
+
return rtn;
}
static int sd_resume(struct device *);
static void sd_rescan(struct device *);
static int sd_done(struct scsi_cmnd *);
+static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
static void scsi_disk_release(struct device *cdev);
static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
return count;
}
+static ssize_t
+sd_show_max_medium_access_timeouts(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
+}
+
+static ssize_t
+sd_store_max_medium_access_timeouts(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
+
+ return err ? err : count;
+}
+
static struct device_attribute sd_disk_attrs[] = {
__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
sd_store_cache_type),
__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
__ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
sd_store_provisioning_mode),
+ __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
+ sd_show_max_medium_access_timeouts,
+ sd_store_max_medium_access_timeouts),
__ATTR_NULL,
};
},
.rescan = sd_rescan,
.done = sd_done,
+ .eh_action = sd_eh_action,
};
/*
.unlock_native_capacity = sd_unlock_native_capacity,
};
+/**
+ * sd_eh_action - error handling callback
+ * @scmd: sd-issued command that has failed
+ * @eh_cmnd: The command that was sent during error handling
+ * @eh_cmnd_len: Length of eh_cmnd in bytes
+ * @eh_disp: The recovery disposition suggested by the midlayer
+ *
+ * This function is called by the SCSI midlayer upon completion of
+ * an error handling command (TEST UNIT READY, START STOP UNIT,
+ * etc.) The command sent to the device by the error handler is
+ * stored in eh_cmnd. The result of sending the eh command is
+ * passed in eh_disp.
+ **/
+static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
+ int eh_cmnd_len, int eh_disp)
+{
+ struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
+
+ if (!scsi_device_online(scmd->device) ||
+ !scsi_medium_access_command(scmd))
+ return eh_disp;
+
+ /*
+ * The device has timed out executing a medium access command.
+ * However, the TEST UNIT READY command sent during error
+ * handling completed successfully. Either the device is in the
+ * process of recovering or has it suffered an internal failure
+ * that prevents access to the storage medium.
+ */
+ if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
+ eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
+ sdkp->medium_access_timed_out++;
+
+ /*
+ * If the device keeps failing read/write commands but TEST UNIT
+ * READY always completes successfully we assume that medium
+ * access is no longer possible and take the device offline.
+ */
+ if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
+ scmd_printk(KERN_ERR, scmd,
+ "Medium access timeout failure. Offlining disk!\n");
+ scsi_device_set_state(scmd->device, SDEV_OFFLINE);
+
+ return FAILED;
+ }
+
+ return eh_disp;
+}
+
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
{
u64 start_lba = blk_rq_pos(scmd->request);
(!sense_valid || sense_deferred))
goto out;
+ sdkp->medium_access_timed_out = 0;
+
switch (sshdr.sense_key) {
case HARDWARE_ERROR:
case MEDIUM_ERROR:
sdkp->RCD = 0;
sdkp->ATO = 0;
sdkp->first_scan = 1;
+ sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
sd_revalidate_disk(gd);
*/
#define SD_MAX_RETRIES 5
#define SD_PASSTHROUGH_RETRIES 1
+#define SD_MAX_MEDIUM_TIMEOUTS 2
/*
* Size of the initial data buffer for mode and read capacity data
u32 unmap_alignment;
u32 index;
unsigned int physical_block_size;
+ unsigned int max_medium_access_timeouts;
+ unsigned int medium_access_timed_out;
u8 media_present;
u8 write_prot;
u8 protection_type;/* Data Integrity Field */
(sdsk)->disk->disk_name, ##a) : \
sdev_printk(prefix, (sdsk)->device, fmt, ##a)
+static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
+{
+ switch (scmd->cmnd[0]) {
+ case READ_6:
+ case READ_10:
+ case READ_12:
+ case READ_16:
+ case SYNCHRONIZE_CACHE:
+ case VERIFY:
+ case VERIFY_12:
+ case VERIFY_16:
+ case WRITE_6:
+ case WRITE_10:
+ case WRITE_12:
+ case WRITE_16:
+ case WRITE_SAME:
+ case WRITE_SAME_16:
+ case UNMAP:
+ return 1;
+ case VARIABLE_LENGTH_CMD:
+ switch (scmd->cmnd[9]) {
+ case READ_32:
+ case VERIFY_32:
+ case WRITE_32:
+ case WRITE_SAME_32:
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
/*
* A DIF-capable target device can be formatted with different
* protection schemes. Currently 0 through 3 are defined:
projects / mirror_ubuntu-zesty-kernel.git / commitdiff