panic after removing usb flash drive
doconnor at gsoft.com.au
Wed Aug 31 13:25:51 GMT 2005
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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-current/attachments/20050831/41de02f2/attachment.bin
More information about the freebsd-current