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be6c34212b
Add support for usage of 'dm-snapshot' for doing whole device conversion in a snapshot which could be merged once the whole conversion has been made. This helps with cases where there would be any unexpected failure in the middle of conversion process and user can continue using original device until problem in conversion is fixed. Import tool now uses 'truncate' tool to create a small backend file (20M) for loop device to hold COW exception store. Option --vdo-config has been added to allow specifing location of vdo configuration file. Option --no-snapshot allows to use import tool without creation of snapshot, however recovery after finished VDO conversion and unfinished lvm2 conversion is then very difficult. Option --uuid-prefix allow to specify DM UUID prefix for snapshot device. Use read with -r.