[PATCH v3 4/4] rbd: Add bdrv_truncate implementation

[Josh Durgin <josh.durgin@xxxxxxxxxxxxx>]

Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxxxx>
---
 block/rbd.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/block/rbd.c b/block/rbd.c
index ac20282..4514dbd 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -686,6 +686,20 @@ static int64_t qemu_rbd_getlength(BlockDriverState *bs)
     return info.size;
 }
 
+static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset)
+{
+    BDRVRBDState *s = bs->opaque;
+    int r;
+
+    r = rbd_resize(s->image, offset);
+    if (r < 0) {
+        error_report("failed to resize rbd image");
+        return -EIO;
+    }
+
+    return 0;
+}
+
 static int qemu_rbd_snap_create(BlockDriverState *bs,
                                 QEMUSnapshotInfo *sn_info)
 {
@@ -784,6 +798,7 @@ static BlockDriver bdrv_rbd = {
     .bdrv_get_info      = qemu_rbd_getinfo,
     .create_options     = qemu_rbd_create_options,
     .bdrv_getlength     = qemu_rbd_getlength,
+    .bdrv_truncate      = qemu_rbd_truncate,
     .protocol_name      = "rbd",
 
     .bdrv_aio_readv     = qemu_rbd_aio_readv,
-- 
1.7.2.3

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