Does dm provide any way for a custom target type to redirect a read or write to a userspace program? Or even for it to notify the program of the read/write and wait until it gives the goahead, somewhat like the way page faulting works? I'm wondering if it's possible to create a target type that implements a 'remote' block device with blocks stored on something like Amazon S3, keeping only a local cache of mapped blocks, and fetching / writing blocks as needed. -Nick Johnson -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
