From owner-freebsd-current  Sun Dec 30 12:30:11 2001
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Date: Sun, 30 Dec 2001 12:29:38 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200112302029.fBUKTcR16908@apollo.backplane.com>
To: Sheldon Hearn <sheldonh@starjuice.net>
Cc: Michal Mertl <mime@traveller.cz>, current@FreeBSD.ORG,
	bmilekic@FreeBSD.ORG
Subject: Re: ntfs and sendfile problem (corrupted data) 
References:  <91552.1009724501@axl.seasidesoftware.co.za>
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    Oops, sorry, that patch was for smbfs on -stable.  Not -current.

    ntfs has a similar problem.  It implements VOP_BMAP but fakes it,
    and ntfs_read() doesn't *USE* the buffer cache, so again sendfile()
    believes that a UIO_NOCOPY read will work when it won't.  And, again
    there is no coherency.  This is even worse then what smbfs() does.

    I think the solution for ntfs is the same as for smbfs... create a
    vop_createvobject tag that does not set VOBJBUF and, as with smbfs,
    this will cause mmap() to fail.

						-Matt

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