Date: Thu, 16 Sep 1999 22:18:00 -0700 (PDT) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/vm vnode_pager.c Message-ID: <199909170518.WAA52160@freefall.freebsd.org>
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dillon 1999/09/16 22:17:59 PDT
Modified files:
sys/vm vnode_pager.c
Log:
The vnode pager (used when you do file-backed mmaps) must use the
underlying physical sector size when aligning I/O transfer sizes.
It cannot assume 512 bytes.
We assume the underlying sector size is a power of 2. If it isn't,
mmap() will break badly anyway (in the same way mmap broke with NFS
when NFS tried to cache piecemeal write ranges in buffers, before
we enforced read-buffer-before-write-piecemeal for NFS).
Reviewed by: Alan Cox <alc@cs.rice.edu>, David Greenman <dg@root.com>
Revision Changes Path
1.115 +12 -4 src/sys/vm/vnode_pager.c
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