Jim I can't use zfs_read/write as the file is mmap()'d so no read/write!
-neel
On Sep 26, 2007, at 5:07 AM, Jim Mauro <[EMAIL PROTECTED]> wrote:
>
> Hi Neel - Thanks for pushing this out. I've been tripping over this
> for a while.
>
> You can instrument zfs_read() and zfs_write() to reliably track
> filenames:
>
> #!/usr/sbin/dtrace -s
>
> #pragma D option quiet
>
> zfs_read:entry,
> zfs_write:entry
> {
> printf("%s of %s\n",probefunc, stringof(args[0]->v_path));
> }
>
>
>
> I'm not sure why the io:::start does not work for ZFS. I didn't
> spend any real time on this,
> but it appears none of the ZFS code calls bdev_strategy() directly,
> and
> instrumenting bdev_strategy:enter (which is where io:::start lives)
> to track
> filenames via stringof(args[0]->b_vp->v_path) does not work either.
>
> Use the zfs r/w function entry points for now.
>
> What sayeth the ZFS team regarding the use of a stable DTrace
> provider with their file system?
>
> Thanks,
> /jim
>
>
> Neelakanth Nadgir wrote:
>> io:::start probe does not seem to get zfs filenames in
>> args[2]->fi_pathname. Any ideas how to get this info?
>> -neel
>>
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