diff options
| author | Olaf Hering <olaf@aepfle.de> | 2014-05-07 13:40:04 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2014-05-07 16:18:04 +0000 |
| commit | f31352041bdde436c3f6d07e1525a42e48dec215 (patch) | |
| tree | 6290479b8a2f3a5b9e360f4e1f9b09a53dd32d26 /include/hw/xen | |
| parent | 8b6bb0ad17ab776239ba2bfc99ff107ada01c506 (diff) | |
xen_disk: add discard support
Implement discard support for xen_disk. It makes use of the existing
discard code in qemu.
The discard support is enabled unconditionally. The tool stack may
provide a property "discard-enable" in the backend node to optionally
disable discard support. This is helpful in case the backing file was
intentionally created non-sparse to avoid fragmentation.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'include/hw/xen')
| -rw-r--r-- | include/hw/xen/xen_common.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index 2d5a25bf40..07731b9289 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -144,6 +144,13 @@ static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom, { return -ENOSYS; } +/* The followings are only to compile op_discard related code on older + * Xen releases. */ +#define BLKIF_OP_DISCARD 5 +struct blkif_request_discard { + uint64_t nr_sectors; + uint64_t sector_number; +}; #else static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom, uint64_t addr, uint32_t data) |