Re: Of removable devices

[Brandon S. Allbery KF8NH]

In message <[e-mail]>, "Khimenko Victor" writes:
+-----
| No. You misunderstood conception again. Idea is simple: user DO NOT NEED TO D
| O
| ANYTHING before floppy removal. But when program tries to write on removed
| floppy (even if there are other floppy inserted and even used) kernel will se
| nd
| message to notification daemon with request to put old floppy back. Process i
| s
| stopped and all dirty buffers are kept in memory till floppy is changed back.
| When "right" floppy is inserted dirty buffers will be put on said floppy and
| process can continue. Without such protection ANY supermount implementations
| are just invitations to disaster. And THAT will require lots of changes in VF
| S.
+--->8

Does it really?  Solaris just uses special devices which are managed by 
vold.  You open /floppy/floppy_id/whatever or /vol/dev/whatever, reads and 
writes are associated with the special devices (not the physical device), 
and when vold needs to access the physical device it notes what media is 
currently in it and if necessary requests a media swap.  vold then accesses 
the physical device on behalf of the virtual device.

This is essentially the block-device version of ptys and screen.

-- 
brandon s. allbery	   os/2,linux,solaris,perl	[e-mail]
system administrator	   kthkrb,heimdal,gnome,rt	  [e-mail]
carnegie mellon / electrical and computer engineering			kf8nh
    We are Linux. Resistance is an indication that you missed the point.