mirror of https://gitee.com/openkylin/linux.git
[SCSI] scsi_sysfs: Implement 'is_visible' callback
Instead of modifying attributes after the device has been created we should be using the 'is_visible' callback to avoid races. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Hannes Reinecke
James Bottomley
parent
9a993302cc
commit
276b20d09b
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@ -576,7 +576,6 @@ static int scsi_sdev_check_buf_bit(const char *buf)
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* Create the actual show/store functions and data structures.
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*/
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sdev_rd_attr (device_blocked, "%d\n");
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sdev_rd_attr (queue_depth, "%d\n");
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sdev_rd_attr (device_busy, "%d\n");
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sdev_rd_attr (type, "%d\n");
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sdev_rd_attr (scsi_level, "%d\n");
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@ -720,7 +719,37 @@ show_queue_type_field(struct device *dev, struct device_attribute *attr,
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return snprintf(buf, 20, "%s\n", name);
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}
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static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
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static ssize_t
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store_queue_type_field(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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struct scsi_host_template *sht = sdev->host->hostt;
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int tag_type = 0, retval;
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int prev_tag_type = scsi_get_tag_type(sdev);
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if (!sdev->tagged_supported || !sht->change_queue_type)
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return -EINVAL;
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if (strncmp(buf, "ordered", 7) == 0)
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tag_type = MSG_ORDERED_TAG;
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else if (strncmp(buf, "simple", 6) == 0)
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tag_type = MSG_SIMPLE_TAG;
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else if (strncmp(buf, "none", 4) != 0)
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return -EINVAL;
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if (tag_type == prev_tag_type)
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return count;
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retval = sht->change_queue_type(sdev, tag_type);
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if (retval < 0)
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return retval;
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return count;
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}
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static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
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store_queue_type_field);
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static ssize_t
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show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
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@ -794,46 +823,9 @@ DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
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DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
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DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
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/* Default template for device attributes. May NOT be modified */
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static struct attribute *scsi_sdev_attrs[] = {
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&dev_attr_device_blocked.attr,
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&dev_attr_type.attr,
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&dev_attr_scsi_level.attr,
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&dev_attr_device_busy.attr,
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&dev_attr_vendor.attr,
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&dev_attr_model.attr,
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&dev_attr_rev.attr,
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&dev_attr_rescan.attr,
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&dev_attr_delete.attr,
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&dev_attr_state.attr,
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&dev_attr_timeout.attr,
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&dev_attr_eh_timeout.attr,
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&dev_attr_iocounterbits.attr,
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&dev_attr_iorequest_cnt.attr,
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&dev_attr_iodone_cnt.attr,
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&dev_attr_ioerr_cnt.attr,
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&dev_attr_modalias.attr,
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REF_EVT(media_change),
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REF_EVT(inquiry_change_reported),
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REF_EVT(capacity_change_reported),
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REF_EVT(soft_threshold_reached),
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REF_EVT(mode_parameter_change_reported),
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REF_EVT(lun_change_reported),
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NULL
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};
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static struct attribute_group scsi_sdev_attr_group = {
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.attrs = scsi_sdev_attrs,
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};
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static const struct attribute_group *scsi_sdev_attr_groups[] = {
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&scsi_sdev_attr_group,
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NULL
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};
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static ssize_t
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sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int depth, retval;
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struct scsi_device *sdev = to_scsi_device(dev);
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@ -856,10 +848,10 @@ sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
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return count;
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}
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sdev_show_function(queue_depth, "%d\n");
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static struct device_attribute sdev_attr_queue_depth_rw =
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__ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
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sdev_store_queue_depth_rw);
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static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
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sdev_store_queue_depth);
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static ssize_t
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sdev_show_queue_ramp_up_period(struct device *dev,
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@ -887,40 +879,73 @@ sdev_store_queue_ramp_up_period(struct device *dev,
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return period;
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}
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static struct device_attribute sdev_attr_queue_ramp_up_period =
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__ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
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sdev_show_queue_ramp_up_period,
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sdev_store_queue_ramp_up_period);
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static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
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sdev_show_queue_ramp_up_period,
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sdev_store_queue_ramp_up_period);
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static ssize_t
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sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int i)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct scsi_device *sdev = to_scsi_device(dev);
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struct scsi_host_template *sht = sdev->host->hostt;
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int tag_type = 0, retval;
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int prev_tag_type = scsi_get_tag_type(sdev);
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if (!sdev->tagged_supported || !sht->change_queue_type)
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return -EINVAL;
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if (strncmp(buf, "ordered", 7) == 0)
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tag_type = MSG_ORDERED_TAG;
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else if (strncmp(buf, "simple", 6) == 0)
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tag_type = MSG_SIMPLE_TAG;
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else if (strncmp(buf, "none", 4) != 0)
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return -EINVAL;
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if (attr == &dev_attr_queue_depth.attr &&
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!sdev->host->hostt->change_queue_depth)
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return S_IRUGO;
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if (tag_type == prev_tag_type)
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return count;
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if (attr == &dev_attr_queue_ramp_up_period.attr &&
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!sdev->host->hostt->change_queue_depth)
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return 0;
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retval = sht->change_queue_type(sdev, tag_type);
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if (retval < 0)
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return retval;
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if (attr == &dev_attr_queue_type.attr &&
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!sdev->host->hostt->change_queue_type)
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return S_IRUGO;
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return count;
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return attr->mode;
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}
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/* Default template for device attributes. May NOT be modified */
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static struct attribute *scsi_sdev_attrs[] = {
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&dev_attr_device_blocked.attr,
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&dev_attr_type.attr,
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&dev_attr_scsi_level.attr,
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&dev_attr_device_busy.attr,
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&dev_attr_vendor.attr,
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&dev_attr_model.attr,
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&dev_attr_rev.attr,
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&dev_attr_rescan.attr,
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&dev_attr_delete.attr,
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&dev_attr_state.attr,
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&dev_attr_timeout.attr,
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&dev_attr_eh_timeout.attr,
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&dev_attr_iocounterbits.attr,
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&dev_attr_iorequest_cnt.attr,
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&dev_attr_iodone_cnt.attr,
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&dev_attr_ioerr_cnt.attr,
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&dev_attr_modalias.attr,
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&dev_attr_queue_depth.attr,
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&dev_attr_queue_type.attr,
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&dev_attr_queue_ramp_up_period.attr,
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REF_EVT(media_change),
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REF_EVT(inquiry_change_reported),
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REF_EVT(capacity_change_reported),
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REF_EVT(soft_threshold_reached),
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REF_EVT(mode_parameter_change_reported),
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REF_EVT(lun_change_reported),
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NULL
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};
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static struct attribute_group scsi_sdev_attr_group = {
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.attrs = scsi_sdev_attrs,
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.is_visible = scsi_sdev_attr_is_visible,
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};
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static const struct attribute_group *scsi_sdev_attr_groups[] = {
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&scsi_sdev_attr_group,
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NULL
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};
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static int scsi_target_add(struct scsi_target *starget)
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{
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int error;
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@ -943,10 +968,6 @@ static int scsi_target_add(struct scsi_target *starget)
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return 0;
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}
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static struct device_attribute sdev_attr_queue_type_rw =
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__ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
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sdev_store_queue_type_rw);
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/**
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* scsi_sysfs_add_sdev - add scsi device to sysfs
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* @sdev: scsi_device to add
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@ -1000,25 +1021,6 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
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transport_add_device(&sdev->sdev_gendev);
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sdev->is_visible = 1;
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/* create queue files, which may be writable, depending on the host */
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if (sdev->host->hostt->change_queue_depth) {
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error = device_create_file(&sdev->sdev_gendev,
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&sdev_attr_queue_depth_rw);
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error = device_create_file(&sdev->sdev_gendev,
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&sdev_attr_queue_ramp_up_period);
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}
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else
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error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
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if (error)
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return error;
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if (sdev->host->hostt->change_queue_type)
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error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
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else
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error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
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if (error)
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return error;
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error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
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if (error)
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