Date: Thu, 24 Sep 1998 17:59:06 -0700 (PDT) From: Matthew Dillon <dillon@backplane.com> To: Luoqi Chen <luoqi@watermarkgroup.com> Cc: committers@FreeBSD.ORG Subject: Re: Kernel is hitting my debugging printf's Message-ID: <199809250059.RAA22443@apollo.backplane.com> References: <199809250052.UAA29657@lor.watermarkgroup.com>
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:Bingo! That's it! I think this is the one that's responsible for the data loss.
:After the page is put on the page cache queue, it could be reclaimed for
:other use. The next time you write to the same disk block, the data has to be
:reread from the disk which doesn't have latest modifications.
:
:To fix this problem, you either could change to if statements to check for
:B_DELWRI bit, or clear B_RELBUF if B_DELWRI is set earlier in the function.
:I prefer the latter because it doesn't make much sense carrying the B_RELBUF
:bit around.
:
:-lq
Ok, I will throw in clearing B_RELBUF if B_DELWRI is set just before
the VMIO buffer rundown in brelse() and let it run for a day or two
on our news box before comitting it.
-Matt
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