On 1/5/18 7:52 PM, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
...
> +/*
> + * Disk Abstraction
> + *
> + * These routines help us to discover the geometry of a block device,
> + * estimate the amount of concurrent IOs that we can send to it, and
> + * abstract the process of performing read verification of disk blocks.
> + */
> +
> +/* Figure out how many disk heads are available. */
> +static unsigned int
> +__disk_heads(
> + struct disk *disk)
> +{
> + int iomin;
> + int ioopt;
> + unsigned short rot;
> + int error;
> +
> + /* If it's not a block device, throw all the CPUs at it. */
> + if (!S_ISBLK(disk->d_sb.st_mode))
> + return nproc;
> +
> + /* Non-rotational device? Throw all the CPUs. */
> + rot = 1;
> + error = ioctl(disk->d_fd, BLKROTATIONAL, &rot);
> + if (error == 0 && rot == 0)
> + return nproc;
I needed
+#ifndef BLKROTATIONAL
+#define BLKROTATIONAL _IO(0x12,126)
+#endif
to make this compile on my not /that/ ancient (?) rhel6 box ;)
-Eric
--
To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
