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Re: ntfs ubc_uiomove error
On Tue, Sep 01, 2009 at 01:20:35PM +0100, Patrick Welche wrote:
> On Thu, Aug 27, 2009 at 01:20:11PM -0400, Christos Zoulas wrote:
> > On Aug 27, 4:21pm, dholland-current%netbsd.org@localhost (David Holland)
> > wrote:
> > -- Subject: Re: ntfs ubc_uiomove error
> > | On Wed, Aug 26, 2009 at 10:22:24AM -0400, Christos Zoulas wrote:
> > | > | I was _reading_ from ntfs vnd, and writing to /tmp (tmpfs or ffs,
> > not sure
> > | > | which now...) The surprise above was that cat worked where cp
> > failed(?!)
> > | >
> > | > Ah, ok... Now I understand :-) NTFS does not implement mmap, and cp
> > uses
> > | > mmap.
> > |
> > | Shouldn't cp be adjusted so it'll fall back to read()?
> > Last I checked it failed differently, mmap(2) returned an invalid
> > pointer and the the application SEGV'd. Clearly this behavior has
> > now changed :-) I don't think that the error is being passed up
> > properly, still.
> A quick look says that cp falls back to read(), and ntfs uses genfs' mmap
> which just returns zero, which means success, no? Rather than return
> not implemented...
An equally quick look tells ntfs supports mmap and therefore should
return success there. I fixed the bug preventing genfs_compat_getpages()
from working and you should get better results with cp(1) now.
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