Date: Fri, 29 Apr 2011 21:18:41 +0000 (UTC) From: Dag-Erling Smorgrav <des@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/md md.c Message-ID: <201104292118.p3TLIxeS059275@repoman.freebsd.org>
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des 2011-04-29 21:18:41 UTC
FreeBSD src repository
Modified files:
sys/dev/md md.c
Log:
SVN rev 221229 on 2011-04-29 21:18:41Z by des
Implement BIO_DELETE for vnode devices by simply overwriting the deleted
sectors with all-zeroes.
The zeroes come from a static buffer; null(4) uses a dynamic buffer for
the same purpose (for /dev/zero). It might be a good idea to have a
static, shared, read-only all-zeroes page somewhere in the kernel that
md(4), null(4) and any other code that needs zeroes could use.
Reviewed by: kib
MFC after: 3 weeks
Revision Changes Path
1.198 +42 -0 src/sys/dev/md/md.c
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