Date: Wed, 28 Jan 1998 23:41:18 +1100 From: Bruce Evans <bde@zeta.org.au> To: cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, cvs-sys@FreeBSD.ORG, msmith@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/isa wfd.c Message-ID: <199801281241.XAA05795@godzilla.zeta.org.au>
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> Modified files: > sys/i386/isa wfd.c > Log: > Fix operation with the Iomega Zip 100 ATAPI. > All known versions of this drive (firmware 21.* and 23.*) will lock up > if presented with a read/write request of > 64 blocks. In the presence > of such a unit, I/O requests of > 64 blocks are fragmented to avoid > this. > > Revision Changes Path > 1.3 +92 -13 src/sys/i386/isa/wfd.c You could simply reject such transfers. The new d_maxio element in struct bdevsw should limit clustering allow physio() to do the deblocking for raw i/o. Deblocking in the driver is only necessary for handling > 32K filesystem blocks, which no one should want, especially on floppies. It is only better if large i/o sizes are significantly more efficient. Bruce
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