Date: Thu, 10 Jul 2008 21:19:35 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-geom@freebsd.org Subject: Re: Can GEOM be used to intercept the I/o calls to an existing mounted device? Message-ID: <g55nc9$art$1@ger.gmane.org> In-Reply-To: <482257ad0807100655u1a5c660awfad05564e40e9a95@mail.gmail.com> References: <482257ad0807100541s2d2c3d1eo6cd57c3a1bc338d1@mail.gmail.com> <200807102309.03191.mark@legios.org> <482257ad0807100655u1a5c660awfad05564e40e9a95@mail.gmail.com>
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[-- Attachment #1 --] Tapan Chaudhari wrote: > Can't I do it on the fly while the device is already mounted? I just want > that all the calls going to the device "/dev/md0s1" first come to me and > then it goes to the original device. In short intercepting the i/o calls. Is > there some way I can achieve this? It would be very nice if GEOM could do this, since it would then trivially allow things like data replication, log/rollback, etc. but it doesn't work like that. In short, no, you cannot listen to IO between providers. (not that it isn't possible to do at all, it just isn't implemented). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIdmDIldnAQVacBcgRAqr9AJ9vAhSfb6e2a29Y4NxAn2QNWRTRpACg8Ht7 z86ZtogEdVF0NwgAb0JoHC8= =M/JJ -----END PGP SIGNATURE-----
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