libata: implement HDIO_GET_IDENTITY
'hdparm -I' doesn't work with ATAPI devices and sg_sat is not widely spread yet leaving no easy way to access ATAPI IDENTIFY data. Implement HDIO_GET_IDENTITY such that at least 'hdparm -i' works. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -148,6 +148,45 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
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return 0;
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}
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/**
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* ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
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* @sdev: SCSI device to get identify data for
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* @arg: User buffer area for identify data
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*
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* LOCKING:
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* Defined by the SCSI layer. We don't really care.
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*
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* RETURNS:
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* Zero on success, negative errno on error.
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*/
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static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
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{
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struct ata_port *ap = ata_shost_to_port(sdev->host);
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struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
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u16 __user *dst = arg;
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char buf[40];
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if (!dev)
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return -ENOMSG;
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if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
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return -EFAULT;
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ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
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if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
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return -EFAULT;
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ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
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if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
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return -EFAULT;
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ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
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if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
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return -EFAULT;
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return 0;
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}
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/**
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* ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
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* @scsidev: Device to which we are issuing command
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@ -159,7 +198,6 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
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* RETURNS:
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* Zero on success, negative errno on error.
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*/
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int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
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{
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int rc = 0;
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@ -359,6 +397,9 @@ int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
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return -EINVAL;
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return 0;
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case HDIO_GET_IDENTITY:
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return ata_get_identity(scsidev, arg);
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case HDIO_DRIVE_CMD:
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if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
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return -EACCES;
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