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pve-qemu-qoup/debian/patches/pve/0028-PVE-Backup-add-backup-dump-block-driver.patch
Fiona Ebner d03e1b3ce3 update submodule and patches to 7.2.0 
User-facing breaking change:

The slirp submodule for user networking got removed. It would be
necessary to add the --enable-slirp option to the build and/or install
the appropriate library to continue building it. Since PVE is not
explicitly supporting it, it would require additionally installing the
libslirp0 package on all installations and there is *very* little
mention on the community forum when searching for "slirp" or
"netdev user", the plan is to only enable it again if there is some
real demand for it.

Notable changes:

* The big change for this release is the rework of job locking, using
  a job mutex and introducing _locked() variants of job API functions
  moving away from call-side AioContext locking. See (in the qemu
  submodule) commit 6f592e5aca ("job.c: enable job lock/unlock and
  remove Aiocontext locks") and previous commits for context.

  Changes required for the backup patches:
  * Use WITH_JOB_LOCK_GUARD() and call the _locked() variant of job
    API functions where appropriate (many are only availalbe as
    a _locked() variant).
  * Remove acquiring/releasing AioContext around functions taking the
    job mutex lock internally.

  The patch introducing sequential transaction support for jobs needs
  to temporarily unlock the job mutex to call job_start() when
  starting the next job in the transaction.

* The zeroinit block driver now marks its child as primary.

  The documentation in include/block/block-common.h states:
  > Filter node has exactly one FILTERED|PRIMARY child, and may have
  > other children which must not have these bits

  Without this, an assert will trigger when copying to a zeroinit target
  with qemu-img convert, because bdrv_child_cb_attach() expects any
  non-PRIMARY child to be not FILTERED:
  > qemu-img convert -n -p -f raw -O raw input.raw zeroinit:output.raw
  > qemu-img: ../block.c:1476: bdrv_child_cb_attach: Assertion
  > `!(child->role & BDRV_CHILD_FILTERED)' failed.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2022-12-16 11:47:20 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Mon, 6 Apr 2020 12:16:58 +0200
Subject: [PATCH] PVE-Backup: add backup-dump block driver
- add backup-dump block driver block/backup-dump.c
- move BackupBlockJob declaration from block/backup.c to include/block/block_int.h
- block/backup.c - backup-job-create: also consider source cluster size
- job.c: make job_should_pause non-static
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
block/backup-dump.c | 167 +++++++++++++++++++++++++++++++
block/backup.c | 30 ++----
block/meson.build | 1 +
include/block/block_int-common.h | 35 +++++++
job.c | 3 +-
5 files changed, 213 insertions(+), 23 deletions(-)
create mode 100644 block/backup-dump.c
diff --git a/block/backup-dump.c b/block/backup-dump.c
new file mode 100644
index 0000000000..04718a94e2
--- /dev/null
+++ b/block/backup-dump.c
@@ -0,0 +1,167 @@
+/*
+ * BlockDriver to send backup data stream to a callback function
+ *
+ * Copyright (C) 2020 Proxmox Server Solutions GmbH
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qom/object_interfaces.h"
+#include "block/block_int.h"
+
+typedef struct {
+ int dump_cb_block_size;
+ uint64_t byte_size;
+ BackupDumpFunc *dump_cb;
+ void *dump_cb_data;
+} BDRVBackupDumpState;
+
+static int qemu_backup_dump_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+ BDRVBackupDumpState *s = bs->opaque;
+
+ bdi->cluster_size = s->dump_cb_block_size;
+ return 0;
+}
+
+static int qemu_backup_dump_check_perm(
+ BlockDriverState *bs,
+ uint64_t perm,
+ uint64_t shared,
+ Error **errp)
+{
+ /* Nothing to do. */
+ return 0;
+}
+
+static void qemu_backup_dump_set_perm(
+ BlockDriverState *bs,
+ uint64_t perm,
+ uint64_t shared)
+{
+ /* Nothing to do. */
+}
+
+static void qemu_backup_dump_abort_perm_update(BlockDriverState *bs)
+{
+ /* Nothing to do. */
+}
+
+static void qemu_backup_dump_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
+}
+
+static void qemu_backup_dump_close(BlockDriverState *bs)
+{
+ /* Nothing to do. */
+}
+
+static int64_t qemu_backup_dump_getlength(BlockDriverState *bs)
+{
+ BDRVBackupDumpState *s = bs->opaque;
+
+ return s->byte_size;
+}
+
+static coroutine_fn int qemu_backup_dump_co_writev(
+ BlockDriverState *bs,
+ int64_t sector_num,
+ int nb_sectors,
+ QEMUIOVector *qiov,
+ int flags)
+{
+ /* flags can be only values we set in supported_write_flags */
+ assert(flags == 0);
+
+ BDRVBackupDumpState *s = bs->opaque;
+ off_t offset = sector_num * BDRV_SECTOR_SIZE;
+
+ uint64_t written = 0;
+
+ for (int i = 0; i < qiov->niov; ++i) {
+ const struct iovec *v = &qiov->iov[i];
+
+ int rc = s->dump_cb(s->dump_cb_data, offset, v->iov_len, v->iov_base);
+ if (rc < 0) {
+ return rc;
+ }
+
+ if (rc != v->iov_len) {
+ return -EIO;
+ }
+
+ written += v->iov_len;
+ offset += v->iov_len;
+ }
+
+ return written;
+}
+
+static void qemu_backup_dump_child_perm(
+ BlockDriverState *bs,
+ BdrvChild *c,
+ BdrvChildRole role,
+ BlockReopenQueue *reopen_queue,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared)
+{
+ *nperm = BLK_PERM_ALL;
+ *nshared = BLK_PERM_ALL;
+}
+
+static BlockDriver bdrv_backup_dump_drive = {
+ .format_name = "backup-dump-drive",
+ .protocol_name = "backup-dump",
+ .instance_size = sizeof(BDRVBackupDumpState),
+
+ .bdrv_close = qemu_backup_dump_close,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
+ .bdrv_getlength = qemu_backup_dump_getlength,
+ .bdrv_get_info = qemu_backup_dump_get_info,
+
+ .bdrv_co_writev = qemu_backup_dump_co_writev,
+
+ .bdrv_refresh_limits = qemu_backup_dump_refresh_limits,
+ .bdrv_check_perm = qemu_backup_dump_check_perm,
+ .bdrv_set_perm = qemu_backup_dump_set_perm,
+ .bdrv_abort_perm_update = qemu_backup_dump_abort_perm_update,
+ .bdrv_child_perm = qemu_backup_dump_child_perm,
+};
+
+static void bdrv_backup_dump_init(void)
+{
+ bdrv_register(&bdrv_backup_dump_drive);
+}
+
+block_init(bdrv_backup_dump_init);
+
+
+BlockDriverState *bdrv_backup_dump_create(
+ int dump_cb_block_size,
+ uint64_t byte_size,
+ BackupDumpFunc *dump_cb,
+ void *dump_cb_data,
+ Error **errp)
+{
+ BDRVBackupDumpState *state;
+ BlockDriverState *bs = bdrv_new_open_driver(
+ &bdrv_backup_dump_drive, NULL, BDRV_O_RDWR, errp);
+
+ if (!bs) {
+ return NULL;
+ }
+
+ bs->total_sectors = byte_size / BDRV_SECTOR_SIZE;
+ bs->opaque = state = g_new0(BDRVBackupDumpState, 1);
+
+ state->dump_cb_block_size = dump_cb_block_size;
+ state->byte_size = byte_size;
+ state->dump_cb = dump_cb;
+ state->dump_cb_data = dump_cb_data;
+
+ return bs;
+}
diff --git a/block/backup.c b/block/backup.c
index 9b0151c5be..6e8f6e67b3 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -29,28 +29,6 @@
#include "block/copy-before-write.h"
-typedef struct BackupBlockJob {
- BlockJob common;
- BlockDriverState *cbw;
- BlockDriverState *source_bs;
- BlockDriverState *target_bs;
-
- BdrvDirtyBitmap *sync_bitmap;
-
- MirrorSyncMode sync_mode;
- BitmapSyncMode bitmap_mode;
- BlockdevOnError on_source_error;
- BlockdevOnError on_target_error;
- uint64_t len;
- int64_t cluster_size;
- BackupPerf perf;
-
- BlockCopyState *bcs;
-
- bool wait;
- BlockCopyCallState *bg_bcs_call;
-} BackupBlockJob;
-
static const BlockJobDriver backup_job_driver;
static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret)
@@ -454,6 +432,14 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
}
cluster_size = block_copy_cluster_size(bcs);
+ if (cluster_size < 0) {
+ goto error;
+ }
+
+ BlockDriverInfo bdi;
+ if (bdrv_get_info(bs, &bdi) == 0) {
+ cluster_size = MAX(cluster_size, bdi.cluster_size);
+ }
if (perf->max_chunk && perf->max_chunk < cluster_size) {
error_setg(errp, "Required max-chunk (%" PRIi64 ") is less than backup "
diff --git a/block/meson.build b/block/meson.build
index 4feae20e37..0d7023fc82 100644
--- a/block/meson.build
+++ b/block/meson.build
@@ -4,6 +4,7 @@ block_ss.add(files(
'aio_task.c',
'amend.c',
'backup.c',
+ 'backup-dump.c',
'copy-before-write.c',
'blkdebug.c',
'blklogwrites.c',
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h
index 31ae91e56e..37b64bcd93 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -26,6 +26,7 @@
#include "block/accounting.h"
#include "block/block.h"
+#include "block/block-copy.h"
#include "block/aio-wait.h"
#include "qemu/queue.h"
#include "qemu/coroutine.h"
@@ -64,6 +65,40 @@
#define BLOCK_PROBE_BUF_SIZE 512
+typedef int BackupDumpFunc(void *opaque, uint64_t offset, uint64_t bytes, const void *buf);
+
+BlockDriverState *bdrv_backup_dump_create(
+ int dump_cb_block_size,
+ uint64_t byte_size,
+ BackupDumpFunc *dump_cb,
+ void *dump_cb_data,
+ Error **errp);
+
+// Needs to be defined here, since it's used in blockdev.c to detect PVE backup
+// jobs with source_bs
+typedef struct BlockCopyState BlockCopyState;
+typedef struct BackupBlockJob {
+ BlockJob common;
+ BlockDriverState *cbw;
+ BlockDriverState *source_bs;
+ BlockDriverState *target_bs;
+
+ BdrvDirtyBitmap *sync_bitmap;
+
+ MirrorSyncMode sync_mode;
+ BitmapSyncMode bitmap_mode;
+ BlockdevOnError on_source_error;
+ BlockdevOnError on_target_error;
+ uint64_t len;
+ int64_t cluster_size;
+ BackupPerf perf;
+
+ BlockCopyState *bcs;
+
+ bool wait;
+ BlockCopyCallState *bg_bcs_call;
+} BackupBlockJob;
+
enum BdrvTrackedRequestType {
BDRV_TRACKED_READ,
BDRV_TRACKED_WRITE,
diff --git a/job.c b/job.c
index 72d57f0934..93e22d180b 100644
--- a/job.c
+++ b/job.c
@@ -330,7 +330,8 @@ static bool job_started_locked(Job *job)
}
/* Called with job_mutex held. */
-static bool job_should_pause_locked(Job *job)
+bool job_should_pause_locked(Job *job);
+bool job_should_pause_locked(Job *job)
{
return job->pause_count > 0;
}
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