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virsh: Implement sparse stream to vol-download

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Add a new --sparse switch that does nothing more than
enables the sparse streams feature for this command. Among with
the switch new helper function is introduced: virshStreamSkip().
This is the callback that is called whenever daemon sends us a
hole. In the callback we reflect the hole in underlying file by
seeking as many bytes as told.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik
2016-04-12 15:35:04 +02:00
parent 1f43aa67c5
commit f03b44b2df
4 changed files with 35 additions and 3 deletions
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12
tools/virsh-volume.c
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@@ -763,6 +763,10 @@ static const vshCmdOptDef opts_vol_download[] = {
.type = VSH_OT_INT,
.help = N_("amount of data to download")
},
{.name = "sparse",
.type = VSH_OT_BOOL,
.help = N_("preserve sparseness of volume")
},
{.name = NULL}
};
@@ -778,6 +782,7 @@ cmdVolDownload(vshControl *ctl, const vshCmd *cmd)
unsigned long long offset = 0, length = 0;
bool created = false;
virshControlPtr priv = ctl->privData;
unsigned int flags = 0;
if (vshCommandOptULongLong(ctl, cmd, "offset", &offset) < 0)
return false;
@@ -791,6 +796,9 @@ cmdVolDownload(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptStringReq(ctl, cmd, "file", &file) < 0)
goto cleanup;
if (vshCommandOptBool(cmd, "sparse"))
flags |= VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM;
if ((fd = open(file, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0) {
if (errno != EEXIST ||
(fd = open(file, O_WRONLY|O_TRUNC, 0666)) < 0) {
@@ -806,12 +814,12 @@ cmdVolDownload(vshControl *ctl, const vshCmd *cmd)
goto cleanup;
}
if (virStorageVolDownload(vol, st, offset, length, 0) < 0) {
if (virStorageVolDownload(vol, st, offset, length, flags) < 0) {
vshError(ctl, _("cannot download from volume %s"), name);
goto cleanup;
}
if (virStreamRecvAll(st, virshStreamSink, &fd) < 0) {
if (virStreamSparseRecvAll(st, virshStreamSink, virshStreamSkip, &fd) < 0) {
vshError(ctl, _("cannot receive data from volume %s"), name);
goto cleanup;
}