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Blame SOURCES/kvm-block-package-preparation-code-in-qmp_transaction.patch

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From 9845ad55c470e47c0074d92611bf9fb2903ab58a Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 9 Sep 2013 14:27:52 +0200
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Subject: [PATCH 01/38] block: package preparation code in qmp_transaction()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <1378736903-18489-2-git-send-email-kwolf@redhat.com>
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Patchwork-id: 54188
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 01/32] block: package preparation code in qmp_transaction()
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Bugzilla: 1005818
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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Bugzilla: 1005818
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The code before really committing is moved into a function. Most
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code is simply moved from qmp_transaction(), except that on fail it
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just returns now. Other code such as input parsing is not touched,
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to make it easier in review.
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Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 9b9877ee9f1c27588a286f591852c0b7c0548b6a)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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 blockdev.c | 139 ++++++++++++++++++++++++++++++++++---------------------------
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 1 file changed, 77 insertions(+), 62 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 blockdev.c |  139 +++++++++++++++++++++++++++++++++---------------------------
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 1 files changed, 77 insertions(+), 62 deletions(-)
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diff --git a/blockdev.c b/blockdev.c
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index 6500c47..1bff654 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -785,6 +785,78 @@ typedef struct BlkTransactionStates {
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     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
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 } BlkTransactionStates;
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+static void external_snapshot_prepare(const char *device,
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+                                      const char *format,
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+                                      const char *new_image_file,
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+                                      enum NewImageMode mode,
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+                                      BlkTransactionStates *states,
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+                                      Error **errp)
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+{
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+    BlockDriver *proto_drv;
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+    BlockDriver *drv;
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+    int flags, ret;
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+    Error *local_err = NULL;
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+
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+    drv = bdrv_find_format(format);
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+    if (!drv) {
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+        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
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+        return;
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+    }
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+
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+    states->old_bs = bdrv_find(device);
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+    if (!states->old_bs) {
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+        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
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+        return;
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+    }
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+
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+    if (!bdrv_is_inserted(states->old_bs)) {
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+        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
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+        return;
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+    }
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+
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+    if (bdrv_in_use(states->old_bs)) {
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+        error_set(errp, QERR_DEVICE_IN_USE, device);
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+        return;
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+    }
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+
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+    if (!bdrv_is_read_only(states->old_bs)) {
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+        if (bdrv_flush(states->old_bs)) {
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+            error_set(errp, QERR_IO_ERROR);
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+            return;
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+        }
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+    }
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+
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+    flags = states->old_bs->open_flags;
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+
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+    proto_drv = bdrv_find_protocol(new_image_file);
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+    if (!proto_drv) {
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+        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
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+        return;
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+    }
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+
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+    /* create new image w/backing file */
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+    if (mode != NEW_IMAGE_MODE_EXISTING) {
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+        bdrv_img_create(new_image_file, format,
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+                        states->old_bs->filename,
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+                        states->old_bs->drv->format_name,
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+                        NULL, -1, flags, &local_err, false);
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+        if (error_is_set(&local_err)) {
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+            error_propagate(errp, local_err);
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+            return;
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+        }
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+    }
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+
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+    /* We will manually add the backing_hd field to the bs later */
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+    states->new_bs = bdrv_new("");
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+    /* TODO Inherit bs->options or only take explicit options with an
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+     * extended QMP command? */
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+    ret = bdrv_open(states->new_bs, new_image_file, NULL,
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+                    flags | BDRV_O_NO_BACKING, drv);
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+    if (ret != 0) {
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+        error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
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+    }
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+}
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+
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 /*
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  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
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  *  then we do not pivot any of the devices in the group, and abandon the
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@@ -792,7 +864,6 @@ typedef struct BlkTransactionStates {
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  */
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 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
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 {
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-    int ret = 0;
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     BlockdevActionList *dev_entry = dev_list;
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     BlkTransactionStates *states, *next;
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     Error *local_err = NULL;
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@@ -806,9 +877,6 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
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     /* We don't do anything in this loop that commits us to the snapshot */
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     while (NULL != dev_entry) {
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         BlockdevAction *dev_info = NULL;
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-        BlockDriver *proto_drv;
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-        BlockDriver *drv;
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-        int flags;
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         enum NewImageMode mode;
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         const char *new_image_file;
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         const char *device;
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@@ -831,70 +899,17 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
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                 format = dev_info->blockdev_snapshot_sync->format;
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             }
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             mode = dev_info->blockdev_snapshot_sync->mode;
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-            break;
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-        default:
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-            abort();
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-        }
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-
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-        drv = bdrv_find_format(format);
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-        if (!drv) {
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-            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
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-            goto delete_and_fail;
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-        }
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-
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-        states->old_bs = bdrv_find(device);
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-        if (!states->old_bs) {
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-            error_set(errp, QERR_DEVICE_NOT_FOUND, device);
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-            goto delete_and_fail;
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-        }
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-
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-        if (!bdrv_is_inserted(states->old_bs)) {
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-            error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
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-            goto delete_and_fail;
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-        }
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-
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-        if (bdrv_in_use(states->old_bs)) {
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-            error_set(errp, QERR_DEVICE_IN_USE, device);
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-            goto delete_and_fail;
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-        }
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-
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-        if (!bdrv_is_read_only(states->old_bs)) {
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-            if (bdrv_flush(states->old_bs)) {
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-                error_set(errp, QERR_IO_ERROR);
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-                goto delete_and_fail;
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-            }
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-        }
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-
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-        flags = states->old_bs->open_flags;
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-
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-        proto_drv = bdrv_find_protocol(new_image_file);
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-        if (!proto_drv) {
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-            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
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-            goto delete_and_fail;
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-        }
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-
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-        /* create new image w/backing file */
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-        if (mode != NEW_IMAGE_MODE_EXISTING) {
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-            bdrv_img_create(new_image_file, format,
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-                            states->old_bs->filename,
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-                            states->old_bs->drv->format_name,
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-                            NULL, -1, flags, &local_err, false);
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+            external_snapshot_prepare(device, format, new_image_file,
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+                                      mode, states, &local_err);
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             if (error_is_set(&local_err)) {
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                 error_propagate(errp, local_err);
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                 goto delete_and_fail;
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             }
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+            break;
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+        default:
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+            abort();
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         }
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-        /* We will manually add the backing_hd field to the bs later */
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-        states->new_bs = bdrv_new("");
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-        /* TODO Inherit bs->options or only take explicit options with an
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-         * extended QMP command? */
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-        ret = bdrv_open(states->new_bs, new_image_file, NULL,
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-                        flags | BDRV_O_NO_BACKING, drv);
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-        if (ret != 0) {
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-            error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
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-            goto delete_and_fail;
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-        }
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     }
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-- 
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1.7.1
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