virsh snapshot-create-as supports 'file' storage type in --diskspec by default. It doesn't support 'block' storage type in the process of virshParseSnapshotDiskspec(). So if a snapshot on a block device (e.g. LV) was created, the type of current running storage source in dumpxml is inconsistent with the actual backend storage source. It will check file-system type mismatch failed and return an error message of 'Migration without shared storage is unsafe' when VM performs a live migration after this snapshot. Signed-off-by: Liu Dayu <liu.dayu@zte.com.cn> --- tools/virsh-snapshot.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/tools/virsh-snapshot.c b/tools/virsh-snapshot.c index f6bb38b..f9c55e0 100644 --- a/tools/virsh-snapshot.c +++ b/tools/virsh-snapshot.c @@ -255,6 +255,8 @@ virshParseSnapshotDiskspec(vshControl *ctl, virBufferPtr buf, const char *str) char **array = NULL; int narray; size_t i; + struct stat st; + int stor_type = VIR_STORAGE_TYPE_NONE; narray = vshStringToArray(str, &array); if (narray <= 0) @@ -272,16 +274,29 @@ virshParseSnapshotDiskspec(vshControl *ctl, virBufferPtr buf, const char *str) goto cleanup; } + /* possibly update storage type */ + if (file && STRPREFIX(file, "/dev/") && stat(file, &st) == 0 && S_ISBLK(st.st_mode)) + stor_type = VIR_STORAGE_TYPE_BLOCK; + else + stor_type = VIR_STORAGE_TYPE_FILE; + virBufferEscapeString(buf, "<disk name='%s'", name); if (snapshot) virBufferAsprintf(buf, " snapshot='%s'", snapshot); + if (stor_type == VIR_STORAGE_TYPE_BLOCK) + virBufferAsprintf(buf, " type='%s'", virStorageTypeToString(stor_type)); + if (driver || file) { virBufferAddLit(buf, ">\n"); virBufferAdjustIndent(buf, 2); if (driver) virBufferAsprintf(buf, "<driver type='%s'/>\n", driver); - if (file) - virBufferEscapeString(buf, "<source file='%s'/>\n", file); + if (file) { + if (stor_type == VIR_STORAGE_TYPE_BLOCK) + virBufferEscapeString(buf, "<source dev='%s'/>\n", file); + else + virBufferEscapeString(buf, "<source file='%s'/>\n", file); + } virBufferAdjustIndent(buf, -2); virBufferAddLit(buf, "</disk>\n"); } else { -- 1.8.3.1