Date: Wed, 15 Feb 2012 00:27:19 -0600 From: Adam Vande More <amvandemore@gmail.com> To: Scott Long <scottl@samsco.org> Cc: freebsd-stable@freebsd.org, Peter Jeremy <peterjeremy@acm.org> Subject: Re: disk devices speed is ugly Message-ID: <CA%2BtpaK0rSPC41_kfGFj3Q7FnaVHt%2BTFNFG=DRa6imSmC5x=CBA@mail.gmail.com> In-Reply-To: <CA28336C-8462-4358-9E68-B01EEB4237CE@samsco.org> References: <4F215A99.8020003@os2.kiev.ua> <4F27C04F.7020400@omnilan.de> <4F27C7C7.3060807@os2.kiev.ua> <CAJ-VmomezUWrEgxxmUEOhWnmLDohMAWRpSXmTR=n2y_LuizKJg@mail.gmail.com> <4F37F81E.7070100@os2.kiev.ua> <CAJ-Vmok9Ph1sgFCy6kNT4XR14grTLvG9M3JvT9eVBRjgqD%2BY9g@mail.gmail.com> <4F38AF69.6010506@os2.kiev.ua> <20120213132821.GA78733@in-addr.com> <20120214200258.GA29641@server.vk2pj.dyndns.org> <CA28336C-8462-4358-9E68-B01EEB4237CE@samsco.org>
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On Tue, Feb 14, 2012 at 10:50 PM, Scott Long <scottl@samsco.org> wrote: > > Any filesystem that uses bread/bwrite/cluster_read are already using the > "generic caching subsystem" that you propose. This includes UDF, CD9660, > MSDOS, NTFS, XFS, ReiserFS, EXT2FS, and HPFS, i.e. every local storage > filesystem in the tree except for ZFS. Not all of them implement > VOP_GETPAGES/VOP_PUTPAGES, but those are just optimizations for the vnode > pager, not requirements for using buffer-cache services on block devices. > As Kostik pointed out in a parallel email, the only thing that was removed > from FreeBSD was the userland interface to cached devices via /dev nodes. > Does this mean the Architecture Handbook page is wrong?: http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html -- Adam Vande More
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