Date: Tue, 23 Jun 1998 02:17:27 -0700 From: David Greenman <dg@root.com> To: zhihuizhang <bf20761@binghamton.edu> Cc: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Questions concerning cache buffer Message-ID: <199806230917.CAA20998@implode.root.com> In-Reply-To: Your message of "Mon, 22 Jun 1998 14:45:46 EDT." <Pine.SOL.L3.93.980622143355.20549A-100000@bingsun1>
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>(1) What is a bogus page? How it is used? It is used as a placeholder for doing partial buffer reads when a modified page exists in the another part of the buffer. >(2) Does the paged I/O array b_pages[] of a buffer alway have *contiguous* >pages? No. >(3) A page can be partially valid and/or dirty. What is the relationship >between being valid and being dirty? Not sure I can answer this to your satisfaction, but support for partial valid/dirty pages is there mainly to support filesystems with less-than- pagesize blocks. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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