loader: implement map-vdisk and unmap-vdisk commands
Add map-vdisk and unmap-vdisk commands to create virtual disk interface on top of file. This will allow to use disk image from file system to load and start the kernel.
By mapping file, we create vdiskX device, the device will be listed by lsdev [-v] and can be accessed directly as ls vdisk0p1:/path or can be used as value for currdev variable.
vdisk strategy function does not use bcache as we have bcache used with backing file. vdisk can be unmapped when all consumers have closed the open files.
In first iteration we do not support the zfs images because zfs pools do keep the device open (there is no "zpool export" mechanism). Adding zfs support is relatively simple, we just need to run zfs disk probe after mapping is done.
Updated by Electric Monk almost 5 years ago
- Status changed from In Progress to Closed
- % Done changed from 90 to 100
commit f47697518b642104e6a9bc6906310e54030d2dc5 Author: Toomas Soome <firstname.lastname@example.org> Date: 2019-04-15T06:06:44.000Z 10598 loader: implement map-vdisk and unmap-vdisk commands Reviewed by: Andy Fiddaman <email@example.com> Approved by: Robert Mustacchi <firstname.lastname@example.org>