mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-05 02:06:40 +00:00
3dc6f86936
Convert all uses of error_report("warning:"... to use warn_report() instead. This helps standardise on a single method of printing warnings to the user. All of the warnings were changed using these two commands: find ./* -type f -exec sed -i \ 's|error_report(".*warning[,:] |warn_report("|Ig' {} + Indentation fixed up manually afterwards. The test-qdev-global-props test case was manually updated to ensure that this patch passes make check (as the test cases are case sensitive). Signed-off-by: Alistair Francis <alistair.francis@xilinx.com> Suggested-by: Thomas Huth <thuth@redhat.com> Cc: Jeff Cody <jcody@redhat.com> Cc: Kevin Wolf <kwolf@redhat.com> Cc: Max Reitz <mreitz@redhat.com> Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Lieven <pl@kamp.de> Cc: Josh Durgin <jdurgin@redhat.com> Cc: "Richard W.M. Jones" <rjones@redhat.com> Cc: Markus Armbruster <armbru@redhat.com> Cc: Peter Crosthwaite <crosthwaite.peter@gmail.com> Cc: Richard Henderson <rth@twiddle.net> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Greg Kurz <groug@kaod.org> Cc: Rob Herring <robh@kernel.org> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Peter Chubb <peter.chubb@nicta.com.au> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Marcel Apfelbaum <marcel@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Alexander Graf <agraf@suse.de> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Cornelia Huck <cohuck@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: Greg Kurz <groug@kaod.org> Acked-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed by: Peter Chubb <peter.chubb@data61.csiro.au> Acked-by: Max Reitz <mreitz@redhat.com> Acked-by: Marcel Apfelbaum <marcel@redhat.com> Message-Id: <e1cfa2cd47087c248dd24caca9c33d9af0c499b0.1499866456.git.alistair.francis@xilinx.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
682 lines
22 KiB
C
682 lines
22 KiB
C
/*
|
|
* QEMU backup
|
|
*
|
|
* Copyright (C) 2013 Proxmox Server Solutions
|
|
*
|
|
* Authors:
|
|
* Dietmar Maurer (dietmar@proxmox.com)
|
|
*
|
|
* 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 "trace.h"
|
|
#include "block/block.h"
|
|
#include "block/block_int.h"
|
|
#include "block/blockjob_int.h"
|
|
#include "block/block_backup.h"
|
|
#include "qapi/error.h"
|
|
#include "qapi/qmp/qerror.h"
|
|
#include "qemu/ratelimit.h"
|
|
#include "qemu/cutils.h"
|
|
#include "sysemu/block-backend.h"
|
|
#include "qemu/bitmap.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
#define BACKUP_CLUSTER_SIZE_DEFAULT (1 << 16)
|
|
#define SLICE_TIME 100000000ULL /* ns */
|
|
|
|
typedef struct BackupBlockJob {
|
|
BlockJob common;
|
|
BlockBackend *target;
|
|
/* bitmap for sync=incremental */
|
|
BdrvDirtyBitmap *sync_bitmap;
|
|
MirrorSyncMode sync_mode;
|
|
RateLimit limit;
|
|
BlockdevOnError on_source_error;
|
|
BlockdevOnError on_target_error;
|
|
CoRwlock flush_rwlock;
|
|
uint64_t bytes_read;
|
|
unsigned long *done_bitmap;
|
|
int64_t cluster_size;
|
|
bool compress;
|
|
NotifierWithReturn before_write;
|
|
QLIST_HEAD(, CowRequest) inflight_reqs;
|
|
} BackupBlockJob;
|
|
|
|
/* See if in-flight requests overlap and wait for them to complete */
|
|
static void coroutine_fn wait_for_overlapping_requests(BackupBlockJob *job,
|
|
int64_t start,
|
|
int64_t end)
|
|
{
|
|
CowRequest *req;
|
|
bool retry;
|
|
|
|
do {
|
|
retry = false;
|
|
QLIST_FOREACH(req, &job->inflight_reqs, list) {
|
|
if (end > req->start_byte && start < req->end_byte) {
|
|
qemu_co_queue_wait(&req->wait_queue, NULL);
|
|
retry = true;
|
|
break;
|
|
}
|
|
}
|
|
} while (retry);
|
|
}
|
|
|
|
/* Keep track of an in-flight request */
|
|
static void cow_request_begin(CowRequest *req, BackupBlockJob *job,
|
|
int64_t start, int64_t end)
|
|
{
|
|
req->start_byte = start;
|
|
req->end_byte = end;
|
|
qemu_co_queue_init(&req->wait_queue);
|
|
QLIST_INSERT_HEAD(&job->inflight_reqs, req, list);
|
|
}
|
|
|
|
/* Forget about a completed request */
|
|
static void cow_request_end(CowRequest *req)
|
|
{
|
|
QLIST_REMOVE(req, list);
|
|
qemu_co_queue_restart_all(&req->wait_queue);
|
|
}
|
|
|
|
static int coroutine_fn backup_do_cow(BackupBlockJob *job,
|
|
int64_t offset, uint64_t bytes,
|
|
bool *error_is_read,
|
|
bool is_write_notifier)
|
|
{
|
|
BlockBackend *blk = job->common.blk;
|
|
CowRequest cow_request;
|
|
struct iovec iov;
|
|
QEMUIOVector bounce_qiov;
|
|
void *bounce_buffer = NULL;
|
|
int ret = 0;
|
|
int64_t start, end; /* bytes */
|
|
int n; /* bytes */
|
|
|
|
qemu_co_rwlock_rdlock(&job->flush_rwlock);
|
|
|
|
start = QEMU_ALIGN_DOWN(offset, job->cluster_size);
|
|
end = QEMU_ALIGN_UP(bytes + offset, job->cluster_size);
|
|
|
|
trace_backup_do_cow_enter(job, start, offset, bytes);
|
|
|
|
wait_for_overlapping_requests(job, start, end);
|
|
cow_request_begin(&cow_request, job, start, end);
|
|
|
|
for (; start < end; start += job->cluster_size) {
|
|
if (test_bit(start / job->cluster_size, job->done_bitmap)) {
|
|
trace_backup_do_cow_skip(job, start);
|
|
continue; /* already copied */
|
|
}
|
|
|
|
trace_backup_do_cow_process(job, start);
|
|
|
|
n = MIN(job->cluster_size, job->common.len - start);
|
|
|
|
if (!bounce_buffer) {
|
|
bounce_buffer = blk_blockalign(blk, job->cluster_size);
|
|
}
|
|
iov.iov_base = bounce_buffer;
|
|
iov.iov_len = n;
|
|
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
|
|
|
|
ret = blk_co_preadv(blk, start, bounce_qiov.size, &bounce_qiov,
|
|
is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0);
|
|
if (ret < 0) {
|
|
trace_backup_do_cow_read_fail(job, start, ret);
|
|
if (error_is_read) {
|
|
*error_is_read = true;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (buffer_is_zero(iov.iov_base, iov.iov_len)) {
|
|
ret = blk_co_pwrite_zeroes(job->target, start,
|
|
bounce_qiov.size, BDRV_REQ_MAY_UNMAP);
|
|
} else {
|
|
ret = blk_co_pwritev(job->target, start,
|
|
bounce_qiov.size, &bounce_qiov,
|
|
job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
|
|
}
|
|
if (ret < 0) {
|
|
trace_backup_do_cow_write_fail(job, start, ret);
|
|
if (error_is_read) {
|
|
*error_is_read = false;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
set_bit(start / job->cluster_size, job->done_bitmap);
|
|
|
|
/* Publish progress, guest I/O counts as progress too. Note that the
|
|
* offset field is an opaque progress value, it is not a disk offset.
|
|
*/
|
|
job->bytes_read += n;
|
|
job->common.offset += n;
|
|
}
|
|
|
|
out:
|
|
if (bounce_buffer) {
|
|
qemu_vfree(bounce_buffer);
|
|
}
|
|
|
|
cow_request_end(&cow_request);
|
|
|
|
trace_backup_do_cow_return(job, offset, bytes, ret);
|
|
|
|
qemu_co_rwlock_unlock(&job->flush_rwlock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn backup_before_write_notify(
|
|
NotifierWithReturn *notifier,
|
|
void *opaque)
|
|
{
|
|
BackupBlockJob *job = container_of(notifier, BackupBlockJob, before_write);
|
|
BdrvTrackedRequest *req = opaque;
|
|
|
|
assert(req->bs == blk_bs(job->common.blk));
|
|
assert(QEMU_IS_ALIGNED(req->offset, BDRV_SECTOR_SIZE));
|
|
assert(QEMU_IS_ALIGNED(req->bytes, BDRV_SECTOR_SIZE));
|
|
|
|
return backup_do_cow(job, req->offset, req->bytes, NULL, true);
|
|
}
|
|
|
|
static void backup_set_speed(BlockJob *job, int64_t speed, Error **errp)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
|
|
if (speed < 0) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER, "speed");
|
|
return;
|
|
}
|
|
ratelimit_set_speed(&s->limit, speed, SLICE_TIME);
|
|
}
|
|
|
|
static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret)
|
|
{
|
|
BdrvDirtyBitmap *bm;
|
|
BlockDriverState *bs = blk_bs(job->common.blk);
|
|
|
|
if (ret < 0 || block_job_is_cancelled(&job->common)) {
|
|
/* Merge the successor back into the parent, delete nothing. */
|
|
bm = bdrv_reclaim_dirty_bitmap(bs, job->sync_bitmap, NULL);
|
|
assert(bm);
|
|
} else {
|
|
/* Everything is fine, delete this bitmap and install the backup. */
|
|
bm = bdrv_dirty_bitmap_abdicate(bs, job->sync_bitmap, NULL);
|
|
assert(bm);
|
|
}
|
|
}
|
|
|
|
static void backup_commit(BlockJob *job)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
if (s->sync_bitmap) {
|
|
backup_cleanup_sync_bitmap(s, 0);
|
|
}
|
|
}
|
|
|
|
static void backup_abort(BlockJob *job)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
if (s->sync_bitmap) {
|
|
backup_cleanup_sync_bitmap(s, -1);
|
|
}
|
|
}
|
|
|
|
static void backup_clean(BlockJob *job)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
assert(s->target);
|
|
blk_unref(s->target);
|
|
s->target = NULL;
|
|
}
|
|
|
|
static void backup_attached_aio_context(BlockJob *job, AioContext *aio_context)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
|
|
blk_set_aio_context(s->target, aio_context);
|
|
}
|
|
|
|
void backup_do_checkpoint(BlockJob *job, Error **errp)
|
|
{
|
|
BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common);
|
|
int64_t len;
|
|
|
|
assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP);
|
|
|
|
if (backup_job->sync_mode != MIRROR_SYNC_MODE_NONE) {
|
|
error_setg(errp, "The backup job only supports block checkpoint in"
|
|
" sync=none mode");
|
|
return;
|
|
}
|
|
|
|
len = DIV_ROUND_UP(backup_job->common.len, backup_job->cluster_size);
|
|
bitmap_zero(backup_job->done_bitmap, len);
|
|
}
|
|
|
|
void backup_wait_for_overlapping_requests(BlockJob *job, int64_t offset,
|
|
uint64_t bytes)
|
|
{
|
|
BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common);
|
|
int64_t start, end;
|
|
|
|
assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP);
|
|
|
|
start = QEMU_ALIGN_DOWN(offset, backup_job->cluster_size);
|
|
end = QEMU_ALIGN_UP(offset + bytes, backup_job->cluster_size);
|
|
wait_for_overlapping_requests(backup_job, start, end);
|
|
}
|
|
|
|
void backup_cow_request_begin(CowRequest *req, BlockJob *job,
|
|
int64_t offset, uint64_t bytes)
|
|
{
|
|
BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common);
|
|
int64_t start, end;
|
|
|
|
assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP);
|
|
|
|
start = QEMU_ALIGN_DOWN(offset, backup_job->cluster_size);
|
|
end = QEMU_ALIGN_UP(offset + bytes, backup_job->cluster_size);
|
|
cow_request_begin(req, backup_job, start, end);
|
|
}
|
|
|
|
void backup_cow_request_end(CowRequest *req)
|
|
{
|
|
cow_request_end(req);
|
|
}
|
|
|
|
static void backup_drain(BlockJob *job)
|
|
{
|
|
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
|
|
|
|
/* Need to keep a reference in case blk_drain triggers execution
|
|
* of backup_complete...
|
|
*/
|
|
if (s->target) {
|
|
BlockBackend *target = s->target;
|
|
blk_ref(target);
|
|
blk_drain(target);
|
|
blk_unref(target);
|
|
}
|
|
}
|
|
|
|
static BlockErrorAction backup_error_action(BackupBlockJob *job,
|
|
bool read, int error)
|
|
{
|
|
if (read) {
|
|
return block_job_error_action(&job->common, job->on_source_error,
|
|
true, error);
|
|
} else {
|
|
return block_job_error_action(&job->common, job->on_target_error,
|
|
false, error);
|
|
}
|
|
}
|
|
|
|
typedef struct {
|
|
int ret;
|
|
} BackupCompleteData;
|
|
|
|
static void backup_complete(BlockJob *job, void *opaque)
|
|
{
|
|
BackupCompleteData *data = opaque;
|
|
|
|
block_job_completed(job, data->ret);
|
|
g_free(data);
|
|
}
|
|
|
|
static bool coroutine_fn yield_and_check(BackupBlockJob *job)
|
|
{
|
|
if (block_job_is_cancelled(&job->common)) {
|
|
return true;
|
|
}
|
|
|
|
/* we need to yield so that bdrv_drain_all() returns.
|
|
* (without, VM does not reboot)
|
|
*/
|
|
if (job->common.speed) {
|
|
uint64_t delay_ns = ratelimit_calculate_delay(&job->limit,
|
|
job->bytes_read);
|
|
job->bytes_read = 0;
|
|
block_job_sleep_ns(&job->common, QEMU_CLOCK_REALTIME, delay_ns);
|
|
} else {
|
|
block_job_sleep_ns(&job->common, QEMU_CLOCK_REALTIME, 0);
|
|
}
|
|
|
|
if (block_job_is_cancelled(&job->common)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
|
|
{
|
|
bool error_is_read;
|
|
int ret = 0;
|
|
int clusters_per_iter;
|
|
uint32_t granularity;
|
|
int64_t offset;
|
|
int64_t cluster;
|
|
int64_t end;
|
|
int64_t last_cluster = -1;
|
|
BdrvDirtyBitmapIter *dbi;
|
|
|
|
granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap);
|
|
clusters_per_iter = MAX((granularity / job->cluster_size), 1);
|
|
dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0);
|
|
|
|
/* Find the next dirty sector(s) */
|
|
while ((offset = bdrv_dirty_iter_next(dbi) * BDRV_SECTOR_SIZE) >= 0) {
|
|
cluster = offset / job->cluster_size;
|
|
|
|
/* Fake progress updates for any clusters we skipped */
|
|
if (cluster != last_cluster + 1) {
|
|
job->common.offset += ((cluster - last_cluster - 1) *
|
|
job->cluster_size);
|
|
}
|
|
|
|
for (end = cluster + clusters_per_iter; cluster < end; cluster++) {
|
|
do {
|
|
if (yield_and_check(job)) {
|
|
goto out;
|
|
}
|
|
ret = backup_do_cow(job, cluster * job->cluster_size,
|
|
job->cluster_size, &error_is_read,
|
|
false);
|
|
if ((ret < 0) &&
|
|
backup_error_action(job, error_is_read, -ret) ==
|
|
BLOCK_ERROR_ACTION_REPORT) {
|
|
goto out;
|
|
}
|
|
} while (ret < 0);
|
|
}
|
|
|
|
/* If the bitmap granularity is smaller than the backup granularity,
|
|
* we need to advance the iterator pointer to the next cluster. */
|
|
if (granularity < job->cluster_size) {
|
|
bdrv_set_dirty_iter(dbi,
|
|
cluster * job->cluster_size / BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
last_cluster = cluster - 1;
|
|
}
|
|
|
|
/* Play some final catchup with the progress meter */
|
|
end = DIV_ROUND_UP(job->common.len, job->cluster_size);
|
|
if (last_cluster + 1 < end) {
|
|
job->common.offset += ((end - last_cluster - 1) * job->cluster_size);
|
|
}
|
|
|
|
out:
|
|
bdrv_dirty_iter_free(dbi);
|
|
return ret;
|
|
}
|
|
|
|
static void coroutine_fn backup_run(void *opaque)
|
|
{
|
|
BackupBlockJob *job = opaque;
|
|
BackupCompleteData *data;
|
|
BlockDriverState *bs = blk_bs(job->common.blk);
|
|
int64_t offset;
|
|
int ret = 0;
|
|
|
|
QLIST_INIT(&job->inflight_reqs);
|
|
qemu_co_rwlock_init(&job->flush_rwlock);
|
|
|
|
job->done_bitmap = bitmap_new(DIV_ROUND_UP(job->common.len,
|
|
job->cluster_size));
|
|
|
|
job->before_write.notify = backup_before_write_notify;
|
|
bdrv_add_before_write_notifier(bs, &job->before_write);
|
|
|
|
if (job->sync_mode == MIRROR_SYNC_MODE_NONE) {
|
|
while (!block_job_is_cancelled(&job->common)) {
|
|
/* Yield until the job is cancelled. We just let our before_write
|
|
* notify callback service CoW requests. */
|
|
block_job_yield(&job->common);
|
|
}
|
|
} else if (job->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
|
|
ret = backup_run_incremental(job);
|
|
} else {
|
|
/* Both FULL and TOP SYNC_MODE's require copying.. */
|
|
for (offset = 0; offset < job->common.len;
|
|
offset += job->cluster_size) {
|
|
bool error_is_read;
|
|
int alloced = 0;
|
|
|
|
if (yield_and_check(job)) {
|
|
break;
|
|
}
|
|
|
|
if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
|
|
int i;
|
|
int64_t n;
|
|
|
|
/* Check to see if these blocks are already in the
|
|
* backing file. */
|
|
|
|
for (i = 0; i < job->cluster_size;) {
|
|
/* bdrv_is_allocated() only returns true/false based
|
|
* on the first set of sectors it comes across that
|
|
* are are all in the same state.
|
|
* For that reason we must verify each sector in the
|
|
* backup cluster length. We end up copying more than
|
|
* needed but at some point that is always the case. */
|
|
alloced =
|
|
bdrv_is_allocated(bs, offset + i,
|
|
job->cluster_size - i, &n);
|
|
i += n;
|
|
|
|
if (alloced || n == 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If the above loop never found any sectors that are in
|
|
* the topmost image, skip this backup. */
|
|
if (alloced == 0) {
|
|
continue;
|
|
}
|
|
}
|
|
/* FULL sync mode we copy the whole drive. */
|
|
if (alloced < 0) {
|
|
ret = alloced;
|
|
} else {
|
|
ret = backup_do_cow(job, offset, job->cluster_size,
|
|
&error_is_read, false);
|
|
}
|
|
if (ret < 0) {
|
|
/* Depending on error action, fail now or retry cluster */
|
|
BlockErrorAction action =
|
|
backup_error_action(job, error_is_read, -ret);
|
|
if (action == BLOCK_ERROR_ACTION_REPORT) {
|
|
break;
|
|
} else {
|
|
offset -= job->cluster_size;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
notifier_with_return_remove(&job->before_write);
|
|
|
|
/* wait until pending backup_do_cow() calls have completed */
|
|
qemu_co_rwlock_wrlock(&job->flush_rwlock);
|
|
qemu_co_rwlock_unlock(&job->flush_rwlock);
|
|
g_free(job->done_bitmap);
|
|
|
|
data = g_malloc(sizeof(*data));
|
|
data->ret = ret;
|
|
block_job_defer_to_main_loop(&job->common, backup_complete, data);
|
|
}
|
|
|
|
static const BlockJobDriver backup_job_driver = {
|
|
.instance_size = sizeof(BackupBlockJob),
|
|
.job_type = BLOCK_JOB_TYPE_BACKUP,
|
|
.start = backup_run,
|
|
.set_speed = backup_set_speed,
|
|
.commit = backup_commit,
|
|
.abort = backup_abort,
|
|
.clean = backup_clean,
|
|
.attached_aio_context = backup_attached_aio_context,
|
|
.drain = backup_drain,
|
|
};
|
|
|
|
BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *target, int64_t speed,
|
|
MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
|
|
bool compress,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
int creation_flags,
|
|
BlockCompletionFunc *cb, void *opaque,
|
|
BlockJobTxn *txn, Error **errp)
|
|
{
|
|
int64_t len;
|
|
BlockDriverInfo bdi;
|
|
BackupBlockJob *job = NULL;
|
|
int ret;
|
|
|
|
assert(bs);
|
|
assert(target);
|
|
|
|
if (bs == target) {
|
|
error_setg(errp, "Source and target cannot be the same");
|
|
return NULL;
|
|
}
|
|
|
|
if (!bdrv_is_inserted(bs)) {
|
|
error_setg(errp, "Device is not inserted: %s",
|
|
bdrv_get_device_name(bs));
|
|
return NULL;
|
|
}
|
|
|
|
if (!bdrv_is_inserted(target)) {
|
|
error_setg(errp, "Device is not inserted: %s",
|
|
bdrv_get_device_name(target));
|
|
return NULL;
|
|
}
|
|
|
|
if (compress && target->drv->bdrv_co_pwritev_compressed == NULL) {
|
|
error_setg(errp, "Compression is not supported for this drive %s",
|
|
bdrv_get_device_name(target));
|
|
return NULL;
|
|
}
|
|
|
|
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
|
|
return NULL;
|
|
}
|
|
|
|
if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_BACKUP_TARGET, errp)) {
|
|
return NULL;
|
|
}
|
|
|
|
if (sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
|
|
if (!sync_bitmap) {
|
|
error_setg(errp, "must provide a valid bitmap name for "
|
|
"\"incremental\" sync mode");
|
|
return NULL;
|
|
}
|
|
|
|
/* Create a new bitmap, and freeze/disable this one. */
|
|
if (bdrv_dirty_bitmap_create_successor(bs, sync_bitmap, errp) < 0) {
|
|
return NULL;
|
|
}
|
|
} else if (sync_bitmap) {
|
|
error_setg(errp,
|
|
"a sync_bitmap was provided to backup_run, "
|
|
"but received an incompatible sync_mode (%s)",
|
|
MirrorSyncMode_lookup[sync_mode]);
|
|
return NULL;
|
|
}
|
|
|
|
len = bdrv_getlength(bs);
|
|
if (len < 0) {
|
|
error_setg_errno(errp, -len, "unable to get length for '%s'",
|
|
bdrv_get_device_name(bs));
|
|
goto error;
|
|
}
|
|
|
|
/* job->common.len is fixed, so we can't allow resize */
|
|
job = block_job_create(job_id, &backup_job_driver, bs,
|
|
BLK_PERM_CONSISTENT_READ,
|
|
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
|
|
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD,
|
|
speed, creation_flags, cb, opaque, errp);
|
|
if (!job) {
|
|
goto error;
|
|
}
|
|
|
|
/* The target must match the source in size, so no resize here either */
|
|
job->target = blk_new(BLK_PERM_WRITE,
|
|
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
|
|
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD);
|
|
ret = blk_insert_bs(job->target, target, errp);
|
|
if (ret < 0) {
|
|
goto error;
|
|
}
|
|
|
|
job->on_source_error = on_source_error;
|
|
job->on_target_error = on_target_error;
|
|
job->sync_mode = sync_mode;
|
|
job->sync_bitmap = sync_mode == MIRROR_SYNC_MODE_INCREMENTAL ?
|
|
sync_bitmap : NULL;
|
|
job->compress = compress;
|
|
|
|
/* If there is no backing file on the target, we cannot rely on COW if our
|
|
* backup cluster size is smaller than the target cluster size. Even for
|
|
* targets with a backing file, try to avoid COW if possible. */
|
|
ret = bdrv_get_info(target, &bdi);
|
|
if (ret == -ENOTSUP && !target->backing) {
|
|
/* Cluster size is not defined */
|
|
warn_report("The target block device doesn't provide "
|
|
"information about the block size and it doesn't have a "
|
|
"backing file. The default block size of %u bytes is "
|
|
"used. If the actual block size of the target exceeds "
|
|
"this default, the backup may be unusable",
|
|
BACKUP_CLUSTER_SIZE_DEFAULT);
|
|
job->cluster_size = BACKUP_CLUSTER_SIZE_DEFAULT;
|
|
} else if (ret < 0 && !target->backing) {
|
|
error_setg_errno(errp, -ret,
|
|
"Couldn't determine the cluster size of the target image, "
|
|
"which has no backing file");
|
|
error_append_hint(errp,
|
|
"Aborting, since this may create an unusable destination image\n");
|
|
goto error;
|
|
} else if (ret < 0 && target->backing) {
|
|
/* Not fatal; just trudge on ahead. */
|
|
job->cluster_size = BACKUP_CLUSTER_SIZE_DEFAULT;
|
|
} else {
|
|
job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
|
|
}
|
|
|
|
/* Required permissions are already taken with target's blk_new() */
|
|
block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
|
|
&error_abort);
|
|
job->common.len = len;
|
|
block_job_txn_add_job(txn, &job->common);
|
|
|
|
return &job->common;
|
|
|
|
error:
|
|
if (sync_bitmap) {
|
|
bdrv_reclaim_dirty_bitmap(bs, sync_bitmap, NULL);
|
|
}
|
|
if (job) {
|
|
backup_clean(&job->common);
|
|
block_job_early_fail(&job->common);
|
|
}
|
|
|
|
return NULL;
|
|
}
|