8099: 7263: Merge branch 'hgi/7263-even-better-busy-behavior' of github.com:wtsi...

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

diff --git a/services/keepstore/volume.go b/services/keepstore/volume.go
index 9bf291bdea28dce8b05baae738c8d42fbca7481c..58710c04b269a57af236fbb36f5a6aaa61d9b256 100644 (file)
--- a/services/keepstore/volume.go
+++ b/services/keepstore/volume.go
@@ -144,20 +144,21 @@ type Volume interface {
        // particular order.
        IndexTo(prefix string, writer io.Writer) error
 
-       // Delete deletes the block data from the underlying storage
-       // device.
+       // Trash moves the block data from the underlying storage
+       // device to trash area. The block then stays in trash for
+       // -trash-lifetime interval before it is actually deleted.
        //
        // loc is as described in Get.
        //
        // If the timestamp for the given locator is newer than
-       // blobSignatureTTL, Delete must not delete the data.
+       // blobSignatureTTL, Trash must not trash the data.
        //
-       // If a Delete operation overlaps with any Touch or Put
+       // If a Trash operation overlaps with any Touch or Put
        // operations on the same locator, the implementation must
        // ensure one of the following outcomes:
        //
        //   - Touch and Put return a non-nil error, or
-       //   - Delete does not delete the block, or
+       //   - Trash does not trash the block, or
        //   - Both of the above.
        //
        // If it is possible for the storage device to be accessed by
@@ -171,9 +172,12 @@ type Volume interface {
        // reliably or fail outright.
        //
        // Corollary: A successful Touch or Put guarantees a block
-       // will not be deleted for at least blobSignatureTTL
+       // will not be trashed for at least blobSignatureTTL
        // seconds.
-       Delete(loc string) error
+       Trash(loc string) error
+
+       // Untrash moves block from trash back into store
+       Untrash(loc string) error
 
        // Status returns a *VolumeStatus representing the current
        // in-use and available storage capacity and an
@@ -195,6 +199,11 @@ 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