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 some information about the device then it would be good. ie if it is a removable type device the default behaviour would be to disable write caching and mount it synchronously. Coupled with a kernel that is willing to throw away pages dirtied on such a volume you would be able to readily hot plug a device without too much worry about data loss. -- 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
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