"Jon Smirl" <jonsmirl@gmail.com> writes:

quoted text
> On 11/14/07, Chuck Lever <chuck.lever@oracle.com> wrote:
>> On Nov 13, 2007, at 7:04 PM, Jon Smirl wrote:
>> > Is it feasible to do something like this in the linux file system
>> > architecture?
>> >
>> > Beagle beats on my disk for an hour when I reboot. Of course I don't
>> > like that and I shut Beagle off.
>>
>> Leopard, by the way, does exactly this: it has a daemon that starts
>> at boot time and taps FSEvents then journals file system changes to a
>> well-known file on local disk.
>
> Logging file systems have all of the needed info.

Actually most journaling file systems in Linux use block logging and
it would be probably hard to get specific file names out of a random
collection of logged blocks. And even if you could they would
hit a lot of false positives since everything is rounded up
to block level.

With intent logging like in XFS/JFS it would be easier, but even
then costly :- e.g. they might log changes to the inode but
there is no back pointer to the file name short of searching the
whole directory tree.

-Andi
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