Date: Sat, 3 Jan 2009 13:24:08 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/kern uipc_cow.c src/sys/vm vm_page.c vm_page.h Message-ID: <200901042353.n04NrkfF084642@repoman.freebsd.org>
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kib 2009-01-03 13:24:08 UTC
FreeBSD src repository
Modified files:
sys/kern uipc_cow.c
sys/vm vm_page.c vm_page.h
Log:
SVN rev 186719 on 2009-01-03 13:24:08Z by kib
Extend the struct vm_page wire_count to u_int to avoid the overflow
of the counter, that may happen when too many sendfile(2) calls are
being executed with this vnode [1].
To keep the size of the struct vm_page and offsets of the fields
accessed by out-of-tree modules, swap the types and locations
of the wire_count and cow fields. Add safety checks to detect cow
overflow and force fallback to the normal copy code for zero-copy
sockets. [2]
Reported by: Anton Yuzhaninov <citrin citrin ru> [1]
Suggested by: alc [2]
Reviewed by: alc
MFC after: 2 weeks
Revision Changes Path
1.28 +5 -1 src/sys/kern/uipc_cow.c
1.375 +5 -1 src/sys/vm/vm_page.c
1.156 +4 -4 src/sys/vm/vm_page.h
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