Messages in this thread | | | Date | Sat, 9 May 2015 09:00:26 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH v3 2/7] block: add REQ_NVM_GC for targets gc |
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On Wed, Apr 22, 2015 at 04:26:51PM +0200, Matias Bj??rling wrote: > In preparation for Open-Channel SSDs. We introduce a special request for > open-channel ssd targets that must perform garbage collection. > > Requests are divided into two types. The user and target specific. User > IOs are from fs, user-space, etc. While target specific are IOs that are > issued in the background by targets. Usually garbage collection actions. > > For the target to issue garbage collection requests, it is a requirement > that a logical address is locked over two requests. One read and one > write. If a write to the logical address comes in from user-space, a > race-condition might occur and garbage collection will write out-dated > data. > > By introducing this flag, the target can manually control locking of > logical addresses.
Seems like this should be a new ->cmd_type instead of a flag.
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