pci: Implement BusInfo.get_dev_path()

[qemu.git] / savevm.c

diff --git a/savevm.c b/savevm.c
index af92ba298268daace30fd58374a3f68c79ac0078..f1f450edc4e4105a3864093686f3801246eb4455 100644 (file)
--- a/savevm.c
+++ b/savevm.c
@@ -77,15 +77,12 @@
 #include "sysemu.h"
 #include "qemu-timer.h"
 #include "qemu-char.h"
-#include "block.h"
+#include "blockdev.h"
 #include "audio/audio.h"
 #include "migration.h"
 #include "qemu_socket.h"
 #include "qemu-queue.h"
 
-/* point to the block driver where the snapshots are managed */
-static BlockDriverState *bs_snapshots;
-
 #define SELF_ANNOUNCE_ROUNDS 5
 
 #ifndef ETH_P_RARP
@@ -1575,40 +1572,6 @@ out:
     return ret;
 }
 
-/* device can contain snapshots */
-static int bdrv_can_snapshot(BlockDriverState *bs)
-{
-    return (bs &&
-            !bdrv_is_removable(bs) &&
-            !bdrv_is_read_only(bs));
-}
-
-/* device must be snapshots in order to have a reliable snapshot */
-static int bdrv_has_snapshot(BlockDriverState *bs)
-{
-    return (bs &&
-            !bdrv_is_removable(bs) &&
-            !bdrv_is_read_only(bs));
-}
-
-static BlockDriverState *get_bs_snapshots(void)
-{
-    BlockDriverState *bs;
-    DriveInfo *dinfo;
-
-    if (bs_snapshots)
-        return bs_snapshots;
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs = dinfo->bdrv;
-        if (bdrv_can_snapshot(bs))
-            goto ok;
-    }
-    return NULL;
- ok:
-    bs_snapshots = bs;
-    return bs;
-}
-
 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
                               const char *name)
 {
@@ -1637,12 +1600,11 @@ static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
 static int del_existing_snapshots(Monitor *mon, const char *name)
 {
     BlockDriverState *bs;
-    DriveInfo *dinfo;
     QEMUSnapshotInfo sn1, *snapshot = &sn1;
     int ret;
 
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs = dinfo->bdrv;
+    bs = NULL;
+    while ((bs = bdrv_next(bs))) {
         if (bdrv_can_snapshot(bs) &&
             bdrv_snapshot_find(bs, snapshot, name) >= 0)
         {
@@ -1661,7 +1623,6 @@ static int del_existing_snapshots(Monitor *mon, const char *name)
 
 void do_savevm(Monitor *mon, const QDict *qdict)
 {
-    DriveInfo *dinfo;
     BlockDriverState *bs, *bs1;
     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
     int ret;
@@ -1675,12 +1636,26 @@ void do_savevm(Monitor *mon, const QDict *qdict)
 #endif
     const char *name = qdict_get_try_str(qdict, "name");
 
-    bs = get_bs_snapshots();
+    /* Verify if there is a device that doesn't support snapshots and is writable */
+    bs = NULL;
+    while ((bs = bdrv_next(bs))) {
+
+        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
+            continue;
+        }
+
+        if (!bdrv_can_snapshot(bs)) {
+            monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
+                               bdrv_get_device_name(bs));
+            return;
+        }
+    }
+
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No block device can accept snapshots\n");
         return;
     }
-
     /* ??? Should this occur after vm_stop?  */
     qemu_aio_flush();
 
@@ -1731,9 +1706,9 @@ void do_savevm(Monitor *mon, const QDict *qdict)
 
     /* create the snapshots */
 
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs1 = dinfo->bdrv;
-        if (bdrv_has_snapshot(bs1)) {
+    bs1 = NULL;
+    while ((bs1 = bdrv_next(bs1))) {
+        if (bdrv_can_snapshot(bs1)) {
             /* Write VM state size only to the image that contains the state */
             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
             ret = bdrv_snapshot_create(bs1, sn);
@@ -1751,13 +1726,27 @@ void do_savevm(Monitor *mon, const QDict *qdict)
 
 int load_vmstate(const char *name)
 {
-    DriveInfo *dinfo;
     BlockDriverState *bs, *bs1;
     QEMUSnapshotInfo sn;
     QEMUFile *f;
     int ret;
 
-    bs = get_bs_snapshots();
+    /* Verify if there is a device that doesn't support snapshots and is writable */
+    bs = NULL;
+    while ((bs = bdrv_next(bs))) {
+
+        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
+            continue;
+        }
+
+        if (!bdrv_can_snapshot(bs)) {
+            error_report("Device '%s' is writable but does not support snapshots.",
+                               bdrv_get_device_name(bs));
+            return -ENOTSUP;
+        }
+    }
+
+    bs = bdrv_snapshots();
     if (!bs) {
         error_report("No block device supports snapshots");
         return -EINVAL;
@@ -1766,9 +1755,9 @@ int load_vmstate(const char *name)
     /* Flush all IO requests so they don't interfere with the new state.  */
     qemu_aio_flush();
 
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs1 = dinfo->bdrv;
-        if (bdrv_has_snapshot(bs1)) {
+    bs1 = NULL;
+    while ((bs1 = bdrv_next(bs1))) {
+        if (bdrv_can_snapshot(bs1)) {
             ret = bdrv_snapshot_goto(bs1, name);
             if (ret < 0) {
                 switch(ret) {
@@ -1817,20 +1806,19 @@ int load_vmstate(const char *name)
 
 void do_delvm(Monitor *mon, const QDict *qdict)
 {
-    DriveInfo *dinfo;
     BlockDriverState *bs, *bs1;
     int ret;
     const char *name = qdict_get_str(qdict, "name");
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No block device supports snapshots\n");
         return;
     }
 
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs1 = dinfo->bdrv;
-        if (bdrv_has_snapshot(bs1)) {
+    bs1 = NULL;
+    while ((bs1 = bdrv_next(bs1))) {
+        if (bdrv_can_snapshot(bs1)) {
             ret = bdrv_snapshot_delete(bs1, name);
             if (ret < 0) {
                 if (ret == -ENOTSUP)
@@ -1847,21 +1835,20 @@ void do_delvm(Monitor *mon, const QDict *qdict)
 
 void do_info_snapshots(Monitor *mon)
 {
-    DriveInfo *dinfo;
     BlockDriverState *bs, *bs1;
     QEMUSnapshotInfo *sn_tab, *sn;
     int nb_sns, i;
     char buf[256];
 
-    bs = get_bs_snapshots();
+    bs = bdrv_snapshots();
     if (!bs) {
         monitor_printf(mon, "No available block device supports snapshots\n");
         return;
     }
     monitor_printf(mon, "Snapshot devices:");
-    QTAILQ_FOREACH(dinfo, &drives, next) {
-        bs1 = dinfo->bdrv;
-        if (bdrv_has_snapshot(bs1)) {
+    bs1 = NULL;
+    while ((bs1 = bdrv_next(bs1))) {
+        if (bdrv_can_snapshot(bs1)) {
             if (bs == bs1)
                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
         }