Date: Wed, 31 Aug 2005 22:55:25 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Eric Anderson <anderson@centtech.com> Cc: freebsd-current@freebsd.org Subject: Re: panic after removing usb flash drive Message-ID: <200508312255.26347.doconnor@gsoft.com.au> In-Reply-To: <4315AD00.70809@centtech.com> References: <1125452228.740.3.camel@arbitor.homelinux.com> <200508312230.20301.doconnor@gsoft.com.au> <4315AD00.70809@centtech.com>
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--nextPart1804758.TfUzCiH1id Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Wednesday 31 August 2005 22:43, Eric Anderson wrote: > This is where I think it would be great to have a sort of 'flashfs' - > something like a UFS2 filesystem, but read only until a write happens, > and all writes would be synchronous, and after the write occurs, the fs > goes back to a 'read only' state. Maybe this could be done with > gjournal or even unionfs - mount the usb flash read only, do all writes > to a memory backed disk, and then flush the writes out to the usb flash > periodically. Not perfect, but maybe this will stir some ideas up. I think if you can differentiate behaviour for normal file systems based on= =20 some information about the device then it would be good. ie if it is a removable type device the default behaviour would be to disab= le=20 write caching and mount it synchronously. Coupled with a kernel that is=20 willing to throw away pages dirtied on such a volume you would be able to=20 readily hot plug a device without too much worry about data loss. =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart1804758.TfUzCiH1id Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQBDFa/G5ZPcIHs/zowRAtmmAJ96qePIPxCmvHLnZnwbwiwtx/DhQwCePKxx xXuxitNE+QkniUwVFhwI9m8= =tpzq -----END PGP SIGNATURE----- --nextPart1804758.TfUzCiH1id--
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