Date: Sat, 9 May 2009 08:30:44 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/vm vnode_pager.c Message-ID: <200905090831.n498V0pr009440@repoman.freebsd.org>
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alc 2009-05-09 08:30:44 UTC
FreeBSD src repository
Modified files:
sys/vm vnode_pager.c
Log:
SVN rev 191935 on 2009-05-09 08:30:44Z by alc
Fix a race involving vnode_pager_input_smlfs(). Specifically, in the case
that vnode_pager_input_smlfs() zeroes the page, it should not mark the page
as valid until after the page is zeroed. Otherwise, the page could be
mapped for read access (e.g., by vm_map_pmap_enter()) before the page is
zeroed. Reviewed by: tegge
Eliminate gratuitous clearing of the page's dirty mask by
vnode_pager_input_smlfs(). Instead, assert that the page is clean.
Reviewed by: tegge
Eliminate some blank lines.
Eliminate pointless calls to pmap_clear_modify() and vm_page_undirty() from
vnode_pager_input_old(). The page is not mapped. Therefore, it cannot have
any page table entries that are modified.
Eliminate an incorrect comment from vnode_pager_generic_getpages().
Revision Changes Path
1.253 +10 -23 src/sys/vm/vnode_pager.c
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