Re: [libvirt] [PATCH 3/5] storage: Add TRIM algorithm to storage volume API

This new algorithm adds support for wiping volumes using TRIM. It does not overwrite all the data in a volume, but it tells the backing storage pool/driver that all bytes in a volume can be discarded. It depends on the backing storage pool how this is handled. A SCSI backend might send UNMAP commands to remove all data present on a LUN. A Ceph backend might use rbd_discard() to instruct the Ceph cluster that all data on that RBD volume can be discarded. Signed-off-by: Wido den Hollander <wido(a)widodh.nl&gt; --- include/libvirt/libvirt-storage.h | 3 +++ src/storage/storage_backend.c | 4 ++++ tools/virsh-volume.c | 2 +- tools/virsh.pod | 1 + 4 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/libvirt/libvirt-storage.h b/include/libvirt/libvirt-storage.h index 2c55c93..232b4d3 100644 --- a/include/libvirt/libvirt-storage.h +++ b/include/libvirt/libvirt-storage.h @@ -153,6 +153,9 @@ typedef enum { VIR_STORAGE_VOL_WIPE_ALG_RANDOM = 8, /* 1-pass random */ + VIR_STORAGE_VOL_WIPE_ALG_TRIM = 9, /* 1-pass, trim all data on the + volume by using TRIM or DISCARD */ +