From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Samuel Subject: Re: Why does stat() return invalid st_dev field for btrfs ?? Date: Tue, 18 Aug 2009 12:40:54 +1000 Message-ID: <200908181240.58480.chris@csamuel.org> References: <4A89C1DA.6040601@rtr.ca> <4A8A0B76.1030800@rtr.ca> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart4290869.zOl6FmAl19"; protocol="application/pgp-signature"; micalg=pgp-sha1 To: linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <4A8A0B76.1030800@rtr.ca> List-ID: --nextPart4290869.zOl6FmAl19 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Tue, 18 Aug 2009 12:01:26 pm Mark Lord wrote: > But really, it should be using DM/LVM when there are multiple devices. Chris Mason addressed a number of these points in this January 2008 comment= on=20 LWN - http://lwn.net/Articles/265533/ - especially: # This is something LVM cannot provide because it cannot maintain # consistent checksums for the FS. and # When multiple devices are present, Btrfs will want to know it is # mirroring on different physical spindles. This is a challenge # with LVM since the locations of physical extents can change without # the FS knowing about it. Even if there were hooks so the FS could # know the current extent mappings, it would end up duplicating a copy # of the mappings internally. =2D-=20 Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC This email may come with a PGP signature as a file. Do not panic. =46or more info see: http://en.wikipedia.org/wiki/OpenPGP --nextPart4290869.zOl6FmAl19 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iQEVAwUASooUto1yjaOTJg85AQInfwgAhSDCQvIl8Demk6sBzDHsTRyWLbNh6Z+c v+U9E5r8fBPGfJiQDH2h5JwzRsqnT6uYZHNhfN/ProtvfwnyzOBqlx8rJRwhBGcn n+r2RR5hwDZjRUrghkj+NEgrt3fiEICR7NqQNnAsizlHMxkPq5aTV/2Vg6aogdFa taw71PmWiy66I79mPl8tvP1K2RYpQClysP0I3YmPnT3Kc3jXZMp0apHUwPt5TFpR RoP1DGxRmKBKol3gOlkuPR/bK21C8HEnJCvZj/OyxXNlp/7y0NxgonNORFIuFyTQ MseJao5gF03+GtfIumFa2jF0Llj41fS8U2ysHjFc+biPxEEfLUf5RQ== =k1gh -----END PGP SIGNATURE----- --nextPart4290869.zOl6FmAl19--