7719: permit never-delte to be set to false; add warning that datamanager is not...

[arvados.git] / services / keepstore / volume.go

diff --git a/services/keepstore/volume.go b/services/keepstore/volume.go
index e6a0f27f52df895d4b38a7f29ebd68ad97cbafdb..7966c41b92bd89958308ec77765f0b7a5a1f0fd9 100644 (file)
--- a/services/keepstore/volume.go
+++ b/services/keepstore/volume.go
@@ -150,7 +150,7 @@ type Volume interface {
        // loc is as described in Get.
        //
        // If the timestamp for the given locator is newer than
-       // blob_signature_ttl, Delete must not delete the data.
+       // blobSignatureTTL, Delete must not delete the data.
        //
        // If a Delete operation overlaps with any Touch or Put
        // operations on the same locator, the implementation must
@@ -171,7 +171,7 @@ type Volume interface {
        // reliably or fail outright.
        //
        // Corollary: A successful Touch or Put guarantees a block
-       // will not be deleted for at least blob_signature_ttl
+       // will not be deleted for at least blobSignatureTTL
        // seconds.
        Delete(loc string) error
 
@@ -195,6 +195,11 @@ type Volume interface {
        // will fail because it is full, but Mtime or Delete can
        // succeed -- then Writable should return false.
        Writable() bool
+
+       // Replication returns the storage redundancy of the
+       // underlying device. It will be passed on to clients in
+       // responses to PUT requests.
+       Replication() int
 }
 
 // A VolumeManager tells callers which volumes can read, which volumes