Subject: Re: wedges and DEV_BSIZE (Was Re: removing VOPs)
To: Bill Studenmund <>
From: Pavel Cahyna <>
List: tech-kern
Date: 10/10/2005 18:39:46
On Mon, 10 Oct 2005 08:39:51 -0700, Bill Studenmund wrote:

>> There has been several patches around for yonks that fixes these issues but 
>> they were never integrated. Our msdosfs f.e. doesn't support non 512 
>> bytes/sector devices. Filingsystems DO change on sectorsize and devices 
>> like DVD/CD+-(M)R(W) can't just do read-modify-write cycle to cope with 
>> blocksizes smaller than the sector size.
> Our device drivers don't support read-modify-write operations now; all 
> reads and writes have to be a multiple of the underlying sector size.

What about raidframe? Doesn't RAID5 require read-modify-write operations?