From 4f7481a9815ec6b879db9cb20be7dcc419274e11 Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Thu, 12 Sep 2013 07:39:32 +0200
Subject: [PATCH 12/29] gluster: Add image resize support

RH-Author: Asias He <asias@redhat.com>
Message-id: <1378971575-22416-2-git-send-email-asias@redhat.com>
Patchwork-id: 54323
O-Subject: [RHEL7.0 qemu-kvm PATCH 1/4] gluster: Add image resize support
Bugzilla: 1007226
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>

From: Paolo Bonzini <pbonzini@redhat.com>

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1005052
Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=6275752

Implement .bdrv_truncate in GlusterFS block driver so that GlusterFS backend
can support image resizing.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Tested-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 42ec24e2851674e0899f71933e0d7d9125f31d76)
---
 block/gluster.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/gluster.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/block/gluster.c b/block/gluster.c
index 61424bc..7b10e9c 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -493,6 +493,19 @@ out:
     return NULL;
 }
 
+static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset)
+{
+    int ret;
+    BDRVGlusterState *s = bs->opaque;
+
+    ret = glfs_ftruncate(s->fd, offset);
+    if (ret < 0) {
+        return -errno;
+    }
+
+    return 0;
+}
+
 static BlockDriverAIOCB *qemu_gluster_aio_readv(BlockDriverState *bs,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque)
@@ -598,6 +611,7 @@ static BlockDriver bdrv_gluster = {
     .bdrv_create                  = qemu_gluster_create,
     .bdrv_getlength               = qemu_gluster_getlength,
     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
+    .bdrv_truncate                = qemu_gluster_truncate,
     .bdrv_aio_readv               = qemu_gluster_aio_readv,
     .bdrv_aio_writev              = qemu_gluster_aio_writev,
     .bdrv_aio_flush               = qemu_gluster_aio_flush,
@@ -614,6 +628,7 @@ static BlockDriver bdrv_gluster_tcp = {
     .bdrv_create                  = qemu_gluster_create,
     .bdrv_getlength               = qemu_gluster_getlength,
     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
+    .bdrv_truncate                = qemu_gluster_truncate,
     .bdrv_aio_readv               = qemu_gluster_aio_readv,
     .bdrv_aio_writev              = qemu_gluster_aio_writev,
     .bdrv_aio_flush               = qemu_gluster_aio_flush,
@@ -630,6 +645,7 @@ static BlockDriver bdrv_gluster_unix = {
     .bdrv_create                  = qemu_gluster_create,
     .bdrv_getlength               = qemu_gluster_getlength,
     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
+    .bdrv_truncate                = qemu_gluster_truncate,
     .bdrv_aio_readv               = qemu_gluster_aio_readv,
     .bdrv_aio_writev              = qemu_gluster_aio_writev,
     .bdrv_aio_flush               = qemu_gluster_aio_flush,
@@ -646,6 +662,7 @@ static BlockDriver bdrv_gluster_rdma = {
     .bdrv_create                  = qemu_gluster_create,
     .bdrv_getlength               = qemu_gluster_getlength,
     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
+    .bdrv_truncate                = qemu_gluster_truncate,
     .bdrv_aio_readv               = qemu_gluster_aio_readv,
     .bdrv_aio_writev              = qemu_gluster_aio_writev,
     .bdrv_aio_flush               = qemu_gluster_aio_flush,
-- 
1.7.1