Revert "maint: prefer enum over int for virstoragefile structs"

This partially reverts commits b279e52f and ea18f8b2.

It turns out our code base is full of:

if ((struct.member = virBlahFromString(str)) < 0)
    goto error;

Meanwhile, the C standard says it is up to the compiler whether
an enum is signed or unsigned when all of its declared values
happen to be positive.  In my testing (Fedora 20, gcc 4.8.2),
the compiler picked signed, and nothing changed.  But others
testing with gcc 4.7 got compiler warnings, because it picked
the enum to be unsigned, but no unsigned value is less than 0.
Even worse:

if ((struct.member = virBlahFromString(str)) <= 0)
    goto error;

is silently compiled without warning, but incorrectly treats -1
from a bad parse as a large positive number with no warning; and
without the compiler's help to find these instances, it is a
nightmare to maintain correctly.  We could force signed enums
with a dummy negative declaration in each enum, or cast the
result of virBlahFromString back to int after assigning to an
enum value, or use a temporary int for collecting results from
virBlahFromString, but those actions are all uglier than what we
were trying to cure by directly using enum types for struct
values in the first place.  It's better off to just live with int
members, and use 'switch ((virFoo) struct.member)' where we want
the compiler to help, than to track down all the conversions from
string to enum and ensure they don't suffer from type problems.

* src/util/virstorageencryption.h: Revert back to int declarations
with comment about enum usage.
* src/util/virstoragefile.h: Likewise.
* src/conf/domain_conf.c: Restore back to casts in switches.
* src/qemu/qemu_driver.c: Likewise.
* src/qemu/qemu_command.c: Add cast rather than revert.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/conf/domain_conf.c

@@ -4972,7 +4972,7 @@ virDomainDiskSourceParse(xmlNodePtr node,
 
     memset(&host, 0, sizeof(host));
 
-    switch (src->type) {
+    switch ((virStorageType)src->type) {
     case VIR_STORAGE_TYPE_FILE:
         src->path = virXMLPropString(node, "file");
         break;
@@ -14847,7 +14847,7 @@ virDomainDiskSourceFormat(virBufferPtr buf,
         startupPolicy = virDomainStartupPolicyTypeToString(policy);
 
     if (src->path || src->nhosts > 0 || src->srcpool || startupPolicy) {
-        switch (src->type) {
+        switch ((virStorageType)src->type) {
         case VIR_STORAGE_TYPE_FILE:
             virBufferAddLit(buf, "<source");
             virBufferEscapeString(buf, " file='%s'", src->path);

src/qemu/qemu_command.c

@@ -11021,7 +11021,7 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
             if (disk->src.type == VIR_STORAGE_TYPE_NETWORK) {
                 char *port;
 
-                switch (disk->src.protocol) {
+                switch ((virStorageNetProtocol) disk->src.protocol) {
                 case VIR_STORAGE_NET_PROTOCOL_NBD:
                     if (qemuParseNBDString(disk) < 0)
                         goto error;

src/qemu/qemu_driver.c

@@ -12368,7 +12368,7 @@ qemuDomainSnapshotPrepareDiskExternalBackingInactive(virDomainDiskDefPtr disk)
         return 0;
 
     case VIR_STORAGE_TYPE_NETWORK:
-        switch (disk->src.protocol) {
+        switch ((virStorageNetProtocol) disk->src.protocol) {
         case VIR_STORAGE_NET_PROTOCOL_NBD:
         case VIR_STORAGE_NET_PROTOCOL_RBD:
         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
@@ -12430,7 +12430,7 @@ qemuDomainSnapshotPrepareDiskExternalOverlayActive(virDomainSnapshotDiskDefPtr d
         return 0;
 
     case VIR_STORAGE_TYPE_NETWORK:
-        switch (disk->src.protocol) {
+        switch ((virStorageNetProtocol) disk->src.protocol) {
         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
             return 0;
 
@@ -12575,7 +12575,7 @@ qemuDomainSnapshotPrepareDiskInternal(virConnectPtr conn,
         return 0;
 
     case VIR_STORAGE_TYPE_NETWORK:
-        switch (disk->src.protocol) {
+        switch ((virStorageNetProtocol) disk->src.protocol) {
         case VIR_STORAGE_NET_PROTOCOL_NBD:
         case VIR_STORAGE_NET_PROTOCOL_RBD:
         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
@@ -12801,7 +12801,7 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver,
         VIR_STRDUP(persistSource, snap->src.path) < 0)
         goto cleanup;
 
-    switch (snap->src.type) {
+    switch ((virStorageType)snap->src.type) {
     case VIR_STORAGE_TYPE_BLOCK:
         reuse = true;
         /* fallthrough */

src/util/virstorageencryption.h

@@ -39,7 +39,7 @@ VIR_ENUM_DECL(virStorageEncryptionSecret)
 typedef struct _virStorageEncryptionSecret virStorageEncryptionSecret;
 typedef virStorageEncryptionSecret *virStorageEncryptionSecretPtr;
 struct _virStorageEncryptionSecret {
-    virStorageEncryptionSecretType type;
+    int type; /* virStorageEncryptionSecretType */
     unsigned char uuid[VIR_UUID_BUFLEN];
 };
 
@@ -55,7 +55,7 @@ VIR_ENUM_DECL(virStorageEncryptionFormat)
 typedef struct _virStorageEncryption virStorageEncryption;
 typedef virStorageEncryption *virStorageEncryptionPtr;
 struct _virStorageEncryption {
-    virStorageEncryptionFormatType format;
+    int format; /* virStorageEncryptionFormatType */
 
     size_t nsecrets;
     virStorageEncryptionSecretPtr *secrets;

src/util/virstoragefile.h

@@ -151,7 +151,7 @@ typedef virStorageNetHostDef *virStorageNetHostDefPtr;
 struct _virStorageNetHostDef {
     char *name;
     char *port;
-    virStorageNetHostTransport transport;
+    int transport; /* virStorageNetHostTransport */
     char *socket;  /* path to unix socket */
 };
 
@@ -183,10 +183,10 @@ typedef struct _virStorageSourcePoolDef virStorageSourcePoolDef;
 struct _virStorageSourcePoolDef {
     char *pool; /* pool name */
     char *volume; /* volume name */
-    virStorageVolType voltype; /* internal only */
+    int voltype; /* virStorageVolType, internal only */
     int pooltype; /* virStoragePoolType from storage_conf.h, internal only */
-    virStorageType actualtype; /* internal only */
-    virStorageSourcePoolMode mode;
+    int actualtype; /* virStorageType, internal only */
+    int mode; /* virStorageSourcePoolMode */
 };
 typedef virStorageSourcePoolDef *virStorageSourcePoolDefPtr;
 
@@ -209,15 +209,15 @@ typedef virStorageSource *virStorageSourcePtr;
  * backing chains, multiple source disks join to form a single guest
  * view.  */
 struct _virStorageSource {
-    virStorageType type;
+    int type; /* virStorageType */
     char *path;
-    virStorageNetProtocol protocol;
+    int protocol; /* virStorageNetProtocol */
     size_t nhosts;
     virStorageNetHostDefPtr hosts;
     virStorageSourcePoolDefPtr srcpool;
     struct {
         char *username;
-        virStorageSecretType secretType;
+        int secretType; /* virStorageSecretType */
         union {
             unsigned char uuid[VIR_UUID_BUFLEN];
             char *usage;