On 2/28/12 3:11 AM, Christoph Hellwig wrote:
> Carlos, didn't you plan to look into this issue?
>
> Goswin, how do you determin that mkfs is still doing unaligned I/O
> when forcing the large sevtor size? Once we set the sector size XFS
> can't do I/O smaller than it.
I did think this was supposed to be working already:
get_topology(&xi, &ft);
if (ft.sectoralign) {
/*
* Older Linux software RAID versions want the sector size
* to match the block size to avoid switching I/O sizes.
* For the legacy libdisk case we thus set the sector size to
* match the block size. For systems using libblkid we assume
* that the kernel is recent enough to not require this and
* ft.sectoralign will never be set.
*/
sectorsize = blocksize;
} else if (!ssflag) {
/*
* Unless specified manually on the command line use the
* advertised sector size of the device.
*/
sectorsize = ft.sectorsize ? ft.sectorsize : XFS_MIN_SECTORSIZE;
}
but it may depend on whether or not it is being built with libblkid support or not...?
I'll try to test it when I have some time, unless Carlos beats me to it.
-Eric
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