fix(backups): fix size of NBD backups

@xen-orchestra/backups/RemoteAdapter.js

@@ -28,6 +28,7 @@ const { isMetadataFile } = require('./_backupType.js')
 const { isValidXva } = require('./_isValidXva.js')
 const { listPartitions, LVM_PARTITION_TYPE } = require('./_listPartitions.js')
 const { lvs, pvs } = require('./_lvm.js')
+const { watchStreamSize } = require('./_watchStreamSize')
 // @todo : this import is marked extraneous , sould be fixed when lib is published
 const { mount } = require('@vates/fuse-vhd')
 const { asyncEach } = require('@vates/async-each')
@@ -661,7 +662,7 @@ class RemoteAdapter {
     const handler = this._handler
     if (this.#useVhdDirectory()) {
       const dataPath = `${dirname(path)}/data/${uuidv4()}.vhd`
-      await createVhdDirectoryFromStream(handler, dataPath, input, {
+      const size = await createVhdDirectoryFromStream(handler, dataPath, input, {
         concurrency: writeBlockConcurrency,
         compression: this.#getCompressionType(),
         async validator() {
@@ -671,12 +672,14 @@ class RemoteAdapter {
         nbdClient,
       })
       await VhdAbstract.createAlias(handler, path, dataPath)
+      return size
     } else {
-      await this.outputStream(path, input, { checksum, validator })
+      return this.outputStream(path, input, { checksum, validator })
     }
   }
 
   async outputStream(path, input, { checksum = true, validator = noop } = {}) {
+    const container = watchStreamSize(input)
     await this._handler.outputStream(path, input, {
       checksum,
       dirMode: this._dirMode,
@@ -685,6 +688,7 @@ class RemoteAdapter {
         return validator.apply(this, arguments)
       },
     })
+    return container.size
   }
 
   // open the  hierarchy of ancestors until we find a full one

@xen-orchestra/backups/writers/DeltaBackupWriter.js

@@ -133,7 +133,7 @@ exports.DeltaBackupWriter = class DeltaBackupWriter extends MixinBackupWriter(Ab
     }
   }
 
-  async _transfer({ timestamp, deltaExport, sizeContainers }) {
+  async _transfer({ timestamp, deltaExport }) {
     const adapter = this._adapter
     const backup = this._backup
 
@@ -172,6 +172,7 @@ exports.DeltaBackupWriter = class DeltaBackupWriter extends MixinBackupWriter(Ab
     }
 
     const { size } = await Task.run({ name: 'transfer' }, async () => {
+      let transferSize = 0
       await Promise.all(
         map(deltaExport.vdis, async (vdi, id) => {
           const path = `${this._vmBackupDir}/${vhds[id]}`
@@ -217,7 +218,8 @@ exports.DeltaBackupWriter = class DeltaBackupWriter extends MixinBackupWriter(Ab
           } else {
             debug('useNbd is disabled', { vdi: id, path })
           }
-          await adapter.writeVhd(path, deltaExport.streams[`${id}.vhd`], {
+
+          transferSize += await adapter.writeVhd(path, deltaExport.streams[`${id}.vhd`], {
             // no checksum for VHDs, because they will be invalidated by
             // merges and chainings
             checksum: false,
@@ -238,9 +240,7 @@ exports.DeltaBackupWriter = class DeltaBackupWriter extends MixinBackupWriter(Ab
           })
         })
       )
-      return {
-        size: Object.values(sizeContainers).reduce((sum, { size }) => sum + size, 0),
-      }
+      return { size: transferSize }
     })
     metadataContent.size = size
     this._metadataFileName = await adapter.writeVmBackupMetadata(vm.uuid, metadataContent)

CHANGELOG.unreleased.md

@@ -13,6 +13,7 @@
 
 - [REST API] Fix 5 minutes timeouts on VDI/VM uploads [#6568](https://github.com/vatesfr/xen-orchestra/issues/6568)
 - [Backup] Fix NBD configuration (PR [#6597](https://github.com/vatesfr/xen-orchestra/pull/6597))
+- [NBD Backups] Fix transfer size [#6599](https://github.com/vatesfr/xen-orchestra/issues/6599)
 
 ### Packages to release
 

packages/vhd-lib/Vhd/VhdAbstract.integ.spec.js

@@ -166,6 +166,17 @@ test('it can create a vhd stream', async () => {
     await vhd.writeFooter()
     const stream = vhd.stream()
 
+    // size and stream must have the same result
+    expect(stream.length).toEqual(vhd.streamSize())
+
+    expect(stream.length).toEqual(
+      512 /* footer */ +
+        1024 /* header */ +
+        512 /* BAT */ +
+        512 /* parentlocator */ +
+        3 * (2 * 1024 * 1024 + 512) /* blocs */ +
+        512 /* end footer */
+    )
     // read all the stream into a buffer
 
     const buffer = await streamToBuffer(stream)

packages/vhd-lib/Vhd/VhdAbstract.js

@@ -239,6 +239,26 @@ exports.VhdAbstract = class VhdAbstract {
     await handler.writeFile(aliasPath, relativePathToTarget)
   }
 
+  streamSize() {
+    const { header, batSize } = this
+    let fileSize = FOOTER_SIZE + HEADER_SIZE + batSize + FOOTER_SIZE /* the footer at the end */
+
+    // add parentlocator size
+    for (let i = 0; i < PARENT_LOCATOR_ENTRIES; i++) {
+      fileSize += header.parentLocatorEntry[i].platformDataSpace * SECTOR_SIZE
+    }
+
+    // add block size
+    for (let i = 0; i < header.maxTableEntries; i++) {
+      if (this.containsBlock(i)) {
+        fileSize += this.fullBlockSize
+      }
+    }
+
+    assert.strictEqual(fileSize % SECTOR_SIZE, 0)
+    return fileSize
+  }
+
   stream() {
     const { footer, batSize } = this
     const { ...header } = this.header // copy since we don't ant to modifiy the current header

packages/vhd-lib/createVhdDirectoryFromStream.js

@@ -38,6 +38,7 @@ const buildVhd = Disposable.wrap(async function* (handler, path, inputStream, {
     }
   )
   await Promise.all([vhd.writeFooter(), vhd.writeHeader(), vhd.writeBlockAllocationTable()])
+  return vhd.streamSize()
 })
 
 exports.createVhdDirectoryFromStream = async function createVhdDirectoryFromStream(
@@ -47,10 +48,11 @@ exports.createVhdDirectoryFromStream = async function createVhdDirectoryFromStre
   { validator, concurrency = 16, compression, nbdClient } = {}
 ) {
   try {
-    await buildVhd(handler, path, inputStream, { concurrency, compression, nbdClient })
+    const size = await buildVhd(handler, path, inputStream, { concurrency, compression, nbdClient })
     if (validator !== undefined) {
       await validator.call(this, path)
     }
+    return size
   } catch (error) {
     // cleanup on error
     await handler.rmtree(path).catch(warn)