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,
};
/*
max(sdkp->physical_block_size,
sdkp->unmap_granularity * logical_block_size);
+ sdkp->provisioning_mode = mode;
+
switch (mode) {
case SD_LBP_DISABLE:
q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
-
- sdkp->provisioning_mode = mode;
}
/**
}
/**
- * sd_init_command - build a scsi (read or write) command from
+ * sd_prep_fn - build a scsi (read or write) command from
* information in the request structure.
* @SCpnt: pointer to mid-level's per scsi command structure that
* contains request and into which the scsi command is written
ret = BLKPREP_KILL;
SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
- "sd_init_command: block=%llu, "
+ "sd_prep_fn: block=%llu, "
"count=%d\n",
(unsigned long long)block,
this_count));
retval = -ENODEV;
if (scsi_block_when_processing_errors(sdp)) {
+ retval = scsi_autopm_get_device(sdp);
+ if (retval)
+ goto out;
+
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
sshdr);
+ scsi_autopm_put_device(sdp);
}
/* failed to execute TUR, assume media not present */
.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:
* some USB ones crash on receiving them, and the pages
* we currently ask for are for SPC-3 and beyond
*/
- if (sdp->scsi_level > SCSI_SPC_2)
+ if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
return 1;
return 0;
}
sdkp->RCD = 0;
sdkp->ATO = 0;
sdkp->first_scan = 1;
+ sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
sd_revalidate_disk(gd);
* (e.g. /dev/sda). More precisely it is the block device major
* and minor number that is chosen here.
*
- * Assume sd_attach is not re-entrant (for time being)
- * Also think about sd_attach() and sd_remove() running coincidentally.
+ * Assume sd_probe is not re-entrant (for time being)
+ * Also think about sd_probe() and sd_remove() running coincidentally.
**/
static int sd_probe(struct device *dev)
{
goto out;
SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
- "sd_attach\n"));
+ "sd_probe\n"));
error = -ENOMEM;
sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff