NJ> Does dm provide any way for a custom target type to redirect a read or NJ> write to a userspace program? Or even for it to notify the program of NJ> the read/write and wait until it gives the goahead, somewhat like the NJ> way page faulting works? I have been working on a userspace target, which allows you to do just what you describe. I have an hg tree up with some userspace tools, as well as an out-of-body version of the kernel module: http://static.danplanet.com/hg/dm-userspace.ring/ I also have an actual kernel tree with dm-userspace support, from which I could generate a patch if the above does not work well for you. NJ> I'm wondering if it's possible to create a target type that NJ> implements a 'remote' block device with blocks stored on something NJ> like Amazon S3, keeping only a local cache of mapped blocks, and NJ> fetching / writing blocks as needed. Yep, I have done similar things with dm-userspace. -- Dan Smith IBM Linux Technology Center Open Hypervisor Team email: danms@xxxxxxxxxx
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