* [Qemu-devel] [PULL 01/20] raw-posix: Fix /dev/cdrom magic on OS X
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 02/20] notify: add NotiferWithReturn so notifier list can abort Kevin Wolf
` (18 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
The raw-posix driver has code to provide a /dev/cdrom on OS X even
though it doesn't really exist. However, since commit c66a6157 the real
filename is dismissed after finding it, so opening /dev/cdrom fails.
Put the filename back into the options QDict to make this work again.
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
block/raw-posix.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index c0ccf27..90ce9f8 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1350,6 +1350,7 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
qemu_close(fd);
}
filename = bsdPath;
+ qdict_put(options, "filename", qstring_from_str(filename));
}
if ( mediaIterator )
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 02/20] notify: add NotiferWithReturn so notifier list can abort
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 01/20] raw-posix: Fix /dev/cdrom magic on OS X Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 03/20] block: add bdrv_add_before_write_notifier() Kevin Wolf
` (17 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
notifier_list_notify() has no return value. This is fine when we just
want to invoke side-effects.
Sometimes it's useful for notifiers to produce a return value. This
allows notifiers to "veto" an operation and will be used by the block
layer before-write notifier.
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
include/qemu/notify.h | 29 +++++++++++++++++++++++++++++
util/notify.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/include/qemu/notify.h b/include/qemu/notify.h
index 4e2e7f0..a3d73e4 100644
--- a/include/qemu/notify.h
+++ b/include/qemu/notify.h
@@ -40,4 +40,33 @@ void notifier_remove(Notifier *notifier);
void notifier_list_notify(NotifierList *list, void *data);
+/* Same as Notifier but allows .notify() to return errors */
+typedef struct NotifierWithReturn NotifierWithReturn;
+
+struct NotifierWithReturn {
+ /**
+ * Return 0 on success (next notifier will be invoked), otherwise
+ * notifier_with_return_list_notify() will stop and return the value.
+ */
+ int (*notify)(NotifierWithReturn *notifier, void *data);
+ QLIST_ENTRY(NotifierWithReturn) node;
+};
+
+typedef struct NotifierWithReturnList {
+ QLIST_HEAD(, NotifierWithReturn) notifiers;
+} NotifierWithReturnList;
+
+#define NOTIFIER_WITH_RETURN_LIST_INITIALIZER(head) \
+ { QLIST_HEAD_INITIALIZER((head).notifiers) }
+
+void notifier_with_return_list_init(NotifierWithReturnList *list);
+
+void notifier_with_return_list_add(NotifierWithReturnList *list,
+ NotifierWithReturn *notifier);
+
+void notifier_with_return_remove(NotifierWithReturn *notifier);
+
+int notifier_with_return_list_notify(NotifierWithReturnList *list,
+ void *data);
+
#endif
diff --git a/util/notify.c b/util/notify.c
index 7b7692a..f215dfc 100644
--- a/util/notify.c
+++ b/util/notify.c
@@ -39,3 +39,33 @@ void notifier_list_notify(NotifierList *list, void *data)
notifier->notify(notifier, data);
}
}
+
+void notifier_with_return_list_init(NotifierWithReturnList *list)
+{
+ QLIST_INIT(&list->notifiers);
+}
+
+void notifier_with_return_list_add(NotifierWithReturnList *list,
+ NotifierWithReturn *notifier)
+{
+ QLIST_INSERT_HEAD(&list->notifiers, notifier, node);
+}
+
+void notifier_with_return_remove(NotifierWithReturn *notifier)
+{
+ QLIST_REMOVE(notifier, node);
+}
+
+int notifier_with_return_list_notify(NotifierWithReturnList *list, void *data)
+{
+ NotifierWithReturn *notifier, *next;
+ int ret = 0;
+
+ QLIST_FOREACH_SAFE(notifier, &list->notifiers, node, next) {
+ ret = notifier->notify(notifier, data);
+ if (ret != 0) {
+ break;
+ }
+ }
+ return ret;
+}
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 03/20] block: add bdrv_add_before_write_notifier()
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 01/20] raw-posix: Fix /dev/cdrom magic on OS X Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 02/20] notify: add NotiferWithReturn so notifier list can abort Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 04/20] block: add basic backup support to block driver Kevin Wolf
` (16 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
The bdrv_add_before_write_notifier() function installs a callback that
is invoked before a write request is processed. This will be used to
implement copy-on-write point-in-time snapshots where we need to copy
out old data before overwriting it.
Note that BdrvTrackedRequest is moved to block_int.h since it is passed
to .notify() functions.
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block.c | 23 ++++++++++++-----------
include/block/block_int.h | 23 ++++++++++++++++++++++-
2 files changed, 34 insertions(+), 12 deletions(-)
diff --git a/block.c b/block.c
index 8e77d46..0898f6b 100644
--- a/block.c
+++ b/block.c
@@ -305,6 +305,7 @@ BlockDriverState *bdrv_new(const char *device_name)
}
bdrv_iostatus_disable(bs);
notifier_list_init(&bs->close_notifiers);
+ notifier_with_return_list_init(&bs->before_write_notifiers);
return bs;
}
@@ -1840,16 +1841,6 @@ int bdrv_commit_all(void)
return 0;
}
-struct BdrvTrackedRequest {
- BlockDriverState *bs;
- int64_t sector_num;
- int nb_sectors;
- bool is_write;
- QLIST_ENTRY(BdrvTrackedRequest) list;
- Coroutine *co; /* owner, used for deadlock detection */
- CoQueue wait_queue; /* coroutines blocked on this request */
-};
-
/**
* Remove an active request from the tracked requests list
*
@@ -2620,7 +2611,11 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
tracked_request_begin(&req, bs, sector_num, nb_sectors, true);
- if (flags & BDRV_REQ_ZERO_WRITE) {
+ ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req);
+
+ if (ret < 0) {
+ /* Do nothing, write notifier decided to fail this request */
+ } else if (flags & BDRV_REQ_ZERO_WRITE) {
ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors);
} else {
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov);
@@ -4581,3 +4576,9 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs)
/* Currently BlockDriverState always uses the main loop AioContext */
return qemu_get_aio_context();
}
+
+void bdrv_add_before_write_notifier(BlockDriverState *bs,
+ NotifierWithReturn *notifier)
+{
+ notifier_with_return_list_add(&bs->before_write_notifiers, notifier);
+}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ba52247..2d00955 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -59,7 +59,16 @@
#define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
#define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
-typedef struct BdrvTrackedRequest BdrvTrackedRequest;
+typedef struct BdrvTrackedRequest {
+ BlockDriverState *bs;
+ int64_t sector_num;
+ int nb_sectors;
+ bool is_write;
+ QLIST_ENTRY(BdrvTrackedRequest) list;
+ Coroutine *co; /* owner, used for deadlock detection */
+ CoQueue wait_queue; /* coroutines blocked on this request */
+} BdrvTrackedRequest;
+
typedef struct BlockIOLimit {
int64_t bps[3];
@@ -248,6 +257,9 @@ struct BlockDriverState {
NotifierList close_notifiers;
+ /* Callback before write request is processed */
+ NotifierWithReturnList before_write_notifiers;
+
/* number of in-flight copy-on-read requests */
unsigned int copy_on_read_in_flight;
@@ -299,6 +311,15 @@ void bdrv_set_io_limits(BlockDriverState *bs,
BlockIOLimit *io_limits);
/**
+ * bdrv_add_before_write_notifier:
+ *
+ * Register a callback that is invoked before write requests are processed but
+ * after any throttling or waiting for overlapping requests.
+ */
+void bdrv_add_before_write_notifier(BlockDriverState *bs,
+ NotifierWithReturn *notifier);
+
+/**
* bdrv_get_aio_context:
*
* Returns: the currently bound #AioContext
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 04/20] block: add basic backup support to block driver
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (2 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 03/20] block: add bdrv_add_before_write_notifier() Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 05/20] blockdev: drop redundant proto_drv check Kevin Wolf
` (15 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Dietmar Maurer <dietmar@proxmox.com>
backup_start() creates a block job that copies a point-in-time snapshot
of a block device to a target block device.
We call backup_do_cow() for each write during backup. That function
reads the original data from the block device before it gets
overwritten. The data is then written to the target device.
Currently backup cluster size is hardcoded to 65536 bytes.
[I made a number of changes to Dietmar's original patch and folded them
in to make code review easy. Here is the full list:
* Drop BackupDumpFunc interface in favor of a target block device
* Detect zero clusters with buffer_is_zero() and use bdrv_co_write_zeroes()
* Use 0 delay instead of 1us, like other block jobs
* Unify creation/start functions into backup_start()
* Simplify cleanup, free bitmap in backup_run() instead of cb
* function
* Use HBitmap to avoid duplicating bitmap code
* Use bdrv_getlength() instead of accessing ->total_sectors
* directly
* Delete the backup.h header file, it is no longer necessary
* Move ./backup.c to block/backup.c
* Remove #ifdefed out code
* Coding style and whitespace cleanups
* Use bdrv_add_before_write_notifier() instead of blockjob-specific hooks
* Keep our own in-flight CowRequest list instead of using block.c
tracked requests. This means a little code duplication but is much
simpler than trying to share the tracked requests list and use the
backup block size.
* Add on_source_error and on_target_error error handling.
* Use trace events instead of DPRINTF()
-- stefanha]
Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/Makefile.objs | 1 +
block/backup.c | 341 ++++++++++++++++++++++++++++++++++++++++++++++
include/block/block_int.h | 19 +++
trace-events | 8 ++
4 files changed, 369 insertions(+)
create mode 100644 block/backup.c
diff --git a/block/Makefile.objs b/block/Makefile.objs
index 2981654..4cf9aa4 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -21,5 +21,6 @@ endif
common-obj-y += stream.o
common-obj-y += commit.o
common-obj-y += mirror.o
+common-obj-y += backup.o
$(obj)/curl.o: QEMU_CFLAGS+=$(CURL_CFLAGS)
diff --git a/block/backup.c b/block/backup.c
new file mode 100644
index 0000000..16105d4
--- /dev/null
+++ b/block/backup.c
@@ -0,0 +1,341 @@
+/*
+ * 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 <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "trace.h"
+#include "block/block.h"
+#include "block/block_int.h"
+#include "block/blockjob.h"
+#include "qemu/ratelimit.h"
+
+#define BACKUP_CLUSTER_BITS 16
+#define BACKUP_CLUSTER_SIZE (1 << BACKUP_CLUSTER_BITS)
+#define BACKUP_SECTORS_PER_CLUSTER (BACKUP_CLUSTER_SIZE / BDRV_SECTOR_SIZE)
+
+#define SLICE_TIME 100000000ULL /* ns */
+
+typedef struct CowRequest {
+ int64_t start;
+ int64_t end;
+ QLIST_ENTRY(CowRequest) list;
+ CoQueue wait_queue; /* coroutines blocked on this request */
+} CowRequest;
+
+typedef struct BackupBlockJob {
+ BlockJob common;
+ BlockDriverState *target;
+ RateLimit limit;
+ BlockdevOnError on_source_error;
+ BlockdevOnError on_target_error;
+ CoRwlock flush_rwlock;
+ uint64_t sectors_read;
+ HBitmap *bitmap;
+ 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 && start < req->end) {
+ qemu_co_queue_wait(&req->wait_queue);
+ 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 = start;
+ req->end = 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(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors,
+ bool *error_is_read)
+{
+ BackupBlockJob *job = (BackupBlockJob *)bs->job;
+ CowRequest cow_request;
+ struct iovec iov;
+ QEMUIOVector bounce_qiov;
+ void *bounce_buffer = NULL;
+ int ret = 0;
+ int64_t start, end;
+ int n;
+
+ qemu_co_rwlock_rdlock(&job->flush_rwlock);
+
+ start = sector_num / BACKUP_SECTORS_PER_CLUSTER;
+ end = DIV_ROUND_UP(sector_num + nb_sectors, BACKUP_SECTORS_PER_CLUSTER);
+
+ trace_backup_do_cow_enter(job, start, sector_num, nb_sectors);
+
+ wait_for_overlapping_requests(job, start, end);
+ cow_request_begin(&cow_request, job, start, end);
+
+ for (; start < end; start++) {
+ if (hbitmap_get(job->bitmap, start)) {
+ trace_backup_do_cow_skip(job, start);
+ continue; /* already copied */
+ }
+
+ trace_backup_do_cow_process(job, start);
+
+ n = MIN(BACKUP_SECTORS_PER_CLUSTER,
+ job->common.len / BDRV_SECTOR_SIZE -
+ start * BACKUP_SECTORS_PER_CLUSTER);
+
+ if (!bounce_buffer) {
+ bounce_buffer = qemu_blockalign(bs, BACKUP_CLUSTER_SIZE);
+ }
+ iov.iov_base = bounce_buffer;
+ iov.iov_len = n * BDRV_SECTOR_SIZE;
+ qemu_iovec_init_external(&bounce_qiov, &iov, 1);
+
+ ret = bdrv_co_readv(bs, start * BACKUP_SECTORS_PER_CLUSTER, n,
+ &bounce_qiov);
+ 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 = bdrv_co_write_zeroes(job->target,
+ start * BACKUP_SECTORS_PER_CLUSTER, n);
+ } else {
+ ret = bdrv_co_writev(job->target,
+ start * BACKUP_SECTORS_PER_CLUSTER, n,
+ &bounce_qiov);
+ }
+ if (ret < 0) {
+ trace_backup_do_cow_write_fail(job, start, ret);
+ if (error_is_read) {
+ *error_is_read = false;
+ }
+ goto out;
+ }
+
+ hbitmap_set(job->bitmap, start, 1);
+
+ /* 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->sectors_read += n;
+ job->common.offset += n * BDRV_SECTOR_SIZE;
+ }
+
+out:
+ if (bounce_buffer) {
+ qemu_vfree(bounce_buffer);
+ }
+
+ cow_request_end(&cow_request);
+
+ trace_backup_do_cow_return(job, sector_num, nb_sectors, ret);
+
+ qemu_co_rwlock_unlock(&job->flush_rwlock);
+
+ return ret;
+}
+
+static int coroutine_fn backup_before_write_notify(
+ NotifierWithReturn *notifier,
+ void *opaque)
+{
+ BdrvTrackedRequest *req = opaque;
+
+ return backup_do_cow(req->bs, req->sector_num, req->nb_sectors, NULL);
+}
+
+static void backup_set_speed(BlockJob *job, int64_t speed, Error **errp)
+{
+ BackupBlockJob *s = container_of(job, BackupBlockJob, common);
+
+ if (speed < 0) {
+ error_set(errp, QERR_INVALID_PARAMETER, "speed");
+ return;
+ }
+ ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
+}
+
+static void backup_iostatus_reset(BlockJob *job)
+{
+ BackupBlockJob *s = container_of(job, BackupBlockJob, common);
+
+ bdrv_iostatus_reset(s->target);
+}
+
+static const BlockJobType backup_job_type = {
+ .instance_size = sizeof(BackupBlockJob),
+ .job_type = "backup",
+ .set_speed = backup_set_speed,
+ .iostatus_reset = backup_iostatus_reset,
+};
+
+static BlockErrorAction backup_error_action(BackupBlockJob *job,
+ bool read, int error)
+{
+ if (read) {
+ return block_job_error_action(&job->common, job->common.bs,
+ job->on_source_error, true, error);
+ } else {
+ return block_job_error_action(&job->common, job->target,
+ job->on_target_error, false, error);
+ }
+}
+
+static void coroutine_fn backup_run(void *opaque)
+{
+ BackupBlockJob *job = opaque;
+ BlockDriverState *bs = job->common.bs;
+ BlockDriverState *target = job->target;
+ BlockdevOnError on_target_error = job->on_target_error;
+ NotifierWithReturn before_write = {
+ .notify = backup_before_write_notify,
+ };
+ int64_t start, end;
+ int ret = 0;
+
+ QLIST_INIT(&job->inflight_reqs);
+ qemu_co_rwlock_init(&job->flush_rwlock);
+
+ start = 0;
+ end = DIV_ROUND_UP(job->common.len / BDRV_SECTOR_SIZE,
+ BACKUP_SECTORS_PER_CLUSTER);
+
+ job->bitmap = hbitmap_alloc(end, 0);
+
+ bdrv_set_enable_write_cache(target, true);
+ bdrv_set_on_error(target, on_target_error, on_target_error);
+ bdrv_iostatus_enable(target);
+
+ bdrv_add_before_write_notifier(bs, &before_write);
+
+ for (; start < end; start++) {
+ bool error_is_read;
+
+ if (block_job_is_cancelled(&job->common)) {
+ break;
+ }
+
+ /* we need to yield so that qemu_aio_flush() returns.
+ * (without, VM does not reboot)
+ */
+ if (job->common.speed) {
+ uint64_t delay_ns = ratelimit_calculate_delay(
+ &job->limit, job->sectors_read);
+ job->sectors_read = 0;
+ block_job_sleep_ns(&job->common, rt_clock, delay_ns);
+ } else {
+ block_job_sleep_ns(&job->common, rt_clock, 0);
+ }
+
+ if (block_job_is_cancelled(&job->common)) {
+ break;
+ }
+
+ ret = backup_do_cow(bs, start * BACKUP_SECTORS_PER_CLUSTER,
+ BACKUP_SECTORS_PER_CLUSTER, &error_is_read);
+ if (ret < 0) {
+ /* Depending on error action, fail now or retry cluster */
+ BlockErrorAction action =
+ backup_error_action(job, error_is_read, -ret);
+ if (action == BDRV_ACTION_REPORT) {
+ break;
+ } else {
+ start--;
+ continue;
+ }
+ }
+ }
+
+ notifier_with_return_remove(&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);
+
+ hbitmap_free(job->bitmap);
+
+ bdrv_iostatus_disable(target);
+ bdrv_delete(target);
+
+ block_job_completed(&job->common, ret);
+}
+
+void backup_start(BlockDriverState *bs, BlockDriverState *target,
+ int64_t speed,
+ BlockdevOnError on_source_error,
+ BlockdevOnError on_target_error,
+ BlockDriverCompletionFunc *cb, void *opaque,
+ Error **errp)
+{
+ int64_t len;
+
+ assert(bs);
+ assert(target);
+ assert(cb);
+
+ if ((on_source_error == BLOCKDEV_ON_ERROR_STOP ||
+ on_source_error == BLOCKDEV_ON_ERROR_ENOSPC) &&
+ !bdrv_iostatus_is_enabled(bs)) {
+ error_set(errp, QERR_INVALID_PARAMETER, "on-source-error");
+ return;
+ }
+
+ len = bdrv_getlength(bs);
+ if (len < 0) {
+ error_setg_errno(errp, -len, "unable to get length for '%s'",
+ bdrv_get_device_name(bs));
+ return;
+ }
+
+ BackupBlockJob *job = block_job_create(&backup_job_type, bs, speed,
+ cb, opaque, errp);
+ if (!job) {
+ return;
+ }
+
+ job->on_source_error = on_source_error;
+ job->on_target_error = on_target_error;
+ job->target = target;
+ job->common.len = len;
+ job->common.co = qemu_coroutine_create(backup_run);
+ qemu_coroutine_enter(job->common.co, job);
+}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 2d00955..c6ac871 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -399,4 +399,23 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
BlockDriverCompletionFunc *cb,
void *opaque, Error **errp);
+/*
+ * backup_start:
+ * @bs: Block device to operate on.
+ * @target: Block device to write to.
+ * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
+ * @on_source_error: The action to take upon error reading from the source.
+ * @on_target_error: The action to take upon error writing to the target.
+ * @cb: Completion function for the job.
+ * @opaque: Opaque pointer value passed to @cb.
+ *
+ * Start a backup operation on @bs. Clusters in @bs are written to @target
+ * until the job is cancelled or manually completed.
+ */
+void backup_start(BlockDriverState *bs, BlockDriverState *target,
+ int64_t speed, BlockdevOnError on_source_error,
+ BlockdevOnError on_target_error,
+ BlockDriverCompletionFunc *cb, void *opaque,
+ Error **errp);
+
#endif /* BLOCK_INT_H */
diff --git a/trace-events b/trace-events
index c5f1ccb..0acce7b 100644
--- a/trace-events
+++ b/trace-events
@@ -92,6 +92,14 @@ mirror_yield_in_flight(void *s, int64_t sector_num, int in_flight) "s %p sector_
mirror_yield_buf_busy(void *s, int nb_chunks, int in_flight) "s %p requested chunks %d in_flight %d"
mirror_break_buf_busy(void *s, int nb_chunks, int in_flight) "s %p requested chunks %d in_flight %d"
+# block/backup.c
+backup_do_cow_enter(void *job, int64_t start, int64_t sector_num, int nb_sectors) "job %p start %"PRId64" sector_num %"PRId64" nb_sectors %d"
+backup_do_cow_return(void *job, int64_t sector_num, int nb_sectors, int ret) "job %p sector_num %"PRId64" nb_sectors %d ret %d"
+backup_do_cow_skip(void *job, int64_t start) "job %p start %"PRId64
+backup_do_cow_process(void *job, int64_t start) "job %p start %"PRId64
+backup_do_cow_read_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
+backup_do_cow_write_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
+
# blockdev.c
qmp_block_job_cancel(void *job) "job %p"
qmp_block_job_pause(void *job) "job %p"
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 05/20] blockdev: drop redundant proto_drv check
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (3 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 04/20] block: add basic backup support to block driver Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 06/20] blockdev: use bdrv_getlength() in qmp_drive_mirror() Kevin Wolf
` (14 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
It is not necessary to check that we can find a protocol block driver
since we create or open the image file. This produces the error that we
need anyway.
Besides, the QERR_INVALID_BLOCK_FORMAT is inappropriate since the
protocol is incorrect rather than the format.
Also drop an empty line between bdrv_open() and checking its return
value. This may be due to copy-pasting from earlier code that performed
other operations before handling errors.
Reported-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 459a87e..c17b525 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -818,7 +818,6 @@ typedef struct ExternalSnapshotStates {
static void external_snapshot_prepare(BlkTransactionStates *common,
Error **errp)
{
- BlockDriver *proto_drv;
BlockDriver *drv;
int flags, ret;
Error *local_err = NULL;
@@ -874,12 +873,6 @@ static void external_snapshot_prepare(BlkTransactionStates *common,
flags = states->old_bs->open_flags;
- proto_drv = bdrv_find_protocol(new_image_file);
- if (!proto_drv) {
- error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
- return;
- }
-
/* create new image w/backing file */
if (mode != NEW_IMAGE_MODE_EXISTING) {
bdrv_img_create(new_image_file, format,
@@ -1375,7 +1368,6 @@ void qmp_drive_mirror(const char *device, const char *target,
{
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
- BlockDriver *proto_drv;
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
@@ -1443,12 +1435,6 @@ void qmp_drive_mirror(const char *device, const char *target,
sync = MIRROR_SYNC_MODE_FULL;
}
- proto_drv = bdrv_find_protocol(target);
- if (!proto_drv) {
- error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
- return;
- }
-
bdrv_get_geometry(bs, &size);
size *= 512;
if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
@@ -1483,7 +1469,6 @@ void qmp_drive_mirror(const char *device, const char *target,
*/
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
-
if (ret < 0) {
bdrv_delete(target_bs);
error_setg_file_open(errp, -ret, target);
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 06/20] blockdev: use bdrv_getlength() in qmp_drive_mirror()
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (4 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 05/20] blockdev: drop redundant proto_drv check Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 07/20] block: add drive-backup QMP command Kevin Wolf
` (13 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
Use bdrv_getlength() for its byte units and error return instead of
bdrv_get_geometry().
Reported-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index c17b525..445f6e1 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1371,7 +1371,7 @@ void qmp_drive_mirror(const char *device, const char *target,
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
- uint64_t size;
+ int64_t size;
int ret;
if (!has_speed) {
@@ -1435,8 +1435,12 @@ void qmp_drive_mirror(const char *device, const char *target,
sync = MIRROR_SYNC_MODE_FULL;
}
- bdrv_get_geometry(bs, &size);
- size *= 512;
+ size = bdrv_getlength(bs);
+ if (size < 0) {
+ error_setg_errno(errp, -size, "bdrv_getlength failed");
+ return;
+ }
+
if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
/* create new image w/o backing file */
assert(format && drv);
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 07/20] block: add drive-backup QMP command
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (5 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 06/20] blockdev: use bdrv_getlength() in qmp_drive_mirror() Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 08/20] blockdev: rename BlkTransactionStates to singular Kevin Wolf
` (12 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
@drive-backup
Start a point-in-time copy of a block device to a new destination. The
status of ongoing drive-backup operations can be checked with
query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
The operation can be stopped before it has completed using the
block-job-cancel command.
@device: the name of the device which should be copied.
@target: the target of the new image. If the file exists, or if it
is a device, the existing file/device will be used as the new
destination. If it does not exist, a new file will be created.
@format: #optional the format of the new destination, default is to
probe if @mode is 'existing', else the format of the source
@mode: #optional whether and how QEMU should create a new image, default is
'absolute-paths'.
@speed: #optional the maximum speed, in bytes per second
@on-source-error: #optional the action to take on an error on the source,
default 'report'. 'stop' and 'enospc' can only be used
if the block device supports io-status (see BlockInfo).
@on-target-error: #optional the action to take on an error on the target,
default 'report' (no limitations, since this applies to
a different block device than @device).
Note that @on-source-error and @on-target-error only affect background I/O.
If an error occurs during a guest write request, the device's rerror/werror
actions will be used.
Returns: nothing on success
If @device is not a valid block device, DeviceNotFound
Since 1.6
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
qapi-schema.json | 46 +++++++++++++++++++++++++++
qmp-commands.hx | 46 +++++++++++++++++++++++++++
3 files changed, 189 insertions(+)
diff --git a/blockdev.c b/blockdev.c
index 445f6e1..c77b2a8 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1353,6 +1353,103 @@ void qmp_block_commit(const char *device,
drive_get_ref(drive_get_by_blockdev(bs));
}
+void qmp_drive_backup(const char *device, const char *target,
+ bool has_format, const char *format,
+ bool has_mode, enum NewImageMode mode,
+ bool has_speed, int64_t speed,
+ bool has_on_source_error, BlockdevOnError on_source_error,
+ bool has_on_target_error, BlockdevOnError on_target_error,
+ Error **errp)
+{
+ BlockDriverState *bs;
+ BlockDriverState *target_bs;
+ BlockDriver *drv = NULL;
+ Error *local_err = NULL;
+ int flags;
+ int64_t size;
+ int ret;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_mode) {
+ mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ }
+
+ bs = bdrv_find(device);
+ if (!bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
+ }
+
+ if (!bdrv_is_inserted(bs)) {
+ error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ return;
+ }
+
+ if (!has_format) {
+ format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
+ }
+ if (format) {
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
+ }
+ }
+
+ if (bdrv_in_use(bs)) {
+ error_set(errp, QERR_DEVICE_IN_USE, device);
+ return;
+ }
+
+ flags = bs->open_flags | BDRV_O_RDWR;
+
+ size = bdrv_getlength(bs);
+ if (size < 0) {
+ error_setg_errno(errp, -size, "bdrv_getlength failed");
+ return;
+ }
+
+ if (mode != NEW_IMAGE_MODE_EXISTING) {
+ assert(format && drv);
+ bdrv_img_create(target, format,
+ NULL, NULL, NULL, size, flags, &local_err, false);
+ }
+
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ target_bs = bdrv_new("");
+ ret = bdrv_open(target_bs, target, NULL, flags, drv);
+ if (ret < 0) {
+ bdrv_delete(target_bs);
+ error_setg_file_open(errp, -ret, target);
+ return;
+ }
+
+ backup_start(bs, target_bs, speed, on_source_error, on_target_error,
+ block_job_cb, bs, &local_err);
+ if (local_err != NULL) {
+ bdrv_delete(target_bs);
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ /* Grab a reference so hotplug does not delete the BlockDriverState from
+ * underneath us.
+ */
+ drive_get_ref(drive_get_by_blockdev(bs));
+}
+
#define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
void qmp_drive_mirror(const char *device, const char *target,
diff --git a/qapi-schema.json b/qapi-schema.json
index a30a728..6fe7efc 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1744,6 +1744,52 @@
'*speed': 'int' } }
##
+# @drive-backup
+#
+# Start a point-in-time copy of a block device to a new destination. The
+# status of ongoing drive-backup operations can be checked with
+# query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
+# The operation can be stopped before it has completed using the
+# block-job-cancel command.
+#
+# @device: the name of the device which should be copied.
+#
+# @target: the target of the new image. If the file exists, or if it
+# is a device, the existing file/device will be used as the new
+# destination. If it does not exist, a new file will be created.
+#
+# @format: #optional the format of the new destination, default is to
+# probe if @mode is 'existing', else the format of the source
+#
+# @mode: #optional whether and how QEMU should create a new image, default is
+# 'absolute-paths'.
+#
+# @speed: #optional the maximum speed, in bytes per second
+#
+# @on-source-error: #optional the action to take on an error on the source,
+# default 'report'. 'stop' and 'enospc' can only be used
+# if the block device supports io-status (see BlockInfo).
+#
+# @on-target-error: #optional the action to take on an error on the target,
+# default 'report' (no limitations, since this applies to
+# a different block device than @device).
+#
+# Note that @on-source-error and @on-target-error only affect background I/O.
+# If an error occurs during a guest write request, the device's rerror/werror
+# actions will be used.
+#
+# Returns: nothing on success
+# If @device is not a valid block device, DeviceNotFound
+#
+# Since 1.6
+##
+{ 'command': 'drive-backup',
+ 'data': { 'device': 'str', 'target': 'str', '*format': 'str',
+ '*mode': 'NewImageMode', '*speed': 'int',
+ '*on-source-error': 'BlockdevOnError',
+ '*on-target-error': 'BlockdevOnError' } }
+
+##
# @drive-mirror
#
# Start mirroring a block device's writes to a new destination.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 8cea5e5..362f0e1 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -912,6 +912,52 @@ EQMP
},
{
+ .name = "drive-backup",
+ .args_type = "device:B,target:s,speed:i?,mode:s?,format:s?,"
+ "on-source-error:s?,on-target-error:s?",
+ .mhandler.cmd_new = qmp_marshal_input_drive_backup,
+ },
+
+SQMP
+drive-backup
+------------
+
+Start a point-in-time copy of a block device to a new destination. The
+status of ongoing drive-backup operations can be checked with
+query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
+The operation can be stopped before it has completed using the
+block-job-cancel command.
+
+Arguments:
+
+- "device": the name of the device which should be copied.
+ (json-string)
+- "target": the target of the new image. If the file exists, or if it is a
+ device, the existing file/device will be used as the new
+ destination. If it does not exist, a new file will be created.
+ (json-string)
+- "format": the format of the new destination, default is to probe if 'mode' is
+ 'existing', else the format of the source
+ (json-string, optional)
+- "mode": whether and how QEMU should create a new image
+ (NewImageMode, optional, default 'absolute-paths')
+- "speed": the maximum speed, in bytes per second (json-int, optional)
+- "on-source-error": the action to take on an error on the source, default
+ 'report'. 'stop' and 'enospc' can only be used
+ if the block device supports io-status.
+ (BlockdevOnError, optional)
+- "on-target-error": the action to take on an error on the target, default
+ 'report' (no limitations, since this applies to
+ a different block device than device).
+ (BlockdevOnError, optional)
+
+Example:
+-> { "execute": "drive-backup", "arguments": { "device": "drive0",
+ "target": "backup.img" } }
+<- { "return": {} }
+EQMP
+
+ {
.name = "block-job-set-speed",
.args_type = "device:B,speed:o",
.mhandler.cmd_new = qmp_marshal_input_block_job_set_speed,
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 08/20] blockdev: rename BlkTransactionStates to singular
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (6 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 07/20] block: add drive-backup QMP command Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 09/20] blockdev: allow BdrvActionOps->commit() to be NULL Kevin Wolf
` (11 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
The QMP 'transaction' command keeps a list of in-flight transactions.
The transaction state structure is called BlkTransactionStates even
though it only deals with a single transaction. The only plural thing
is the linked list of transaction states.
I find it confusing to call the single structure "States". This patch
renames it to "State", just like BlockDriverState is singular.
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 104 ++++++++++++++++++++++++++++++-------------------------------
1 file changed, 52 insertions(+), 52 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index c77b2a8..5312e60 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -780,7 +780,7 @@ void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
/* New and old BlockDriverState structs for group snapshots */
-typedef struct BlkTransactionStates BlkTransactionStates;
+typedef struct BlkTransactionState BlkTransactionState;
/* Only prepare() may fail. In a single transaction, only one of commit() or
abort() will be called, clean() will always be called if it present. */
@@ -788,13 +788,13 @@ typedef struct BdrvActionOps {
/* Size of state struct, in bytes. */
size_t instance_size;
/* Prepare the work, must NOT be NULL. */
- void (*prepare)(BlkTransactionStates *common, Error **errp);
+ void (*prepare)(BlkTransactionState *common, Error **errp);
/* Commit the changes, must NOT be NULL. */
- void (*commit)(BlkTransactionStates *common);
+ void (*commit)(BlkTransactionState *common);
/* Abort the changes on fail, can be NULL. */
- void (*abort)(BlkTransactionStates *common);
+ void (*abort)(BlkTransactionState *common);
/* Clean up resource in the end, can be NULL. */
- void (*clean)(BlkTransactionStates *common);
+ void (*clean)(BlkTransactionState *common);
} BdrvActionOps;
/*
@@ -802,20 +802,20 @@ typedef struct BdrvActionOps {
* that compiler will also arrange it to the same address with parent instance.
* Later it will be used in free().
*/
-struct BlkTransactionStates {
+struct BlkTransactionState {
TransactionAction *action;
const BdrvActionOps *ops;
- QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
+ QSIMPLEQ_ENTRY(BlkTransactionState) entry;
};
/* external snapshot private data */
-typedef struct ExternalSnapshotStates {
- BlkTransactionStates common;
+typedef struct ExternalSnapshotState {
+ BlkTransactionState common;
BlockDriverState *old_bs;
BlockDriverState *new_bs;
-} ExternalSnapshotStates;
+} ExternalSnapshotState;
-static void external_snapshot_prepare(BlkTransactionStates *common,
+static void external_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
BlockDriver *drv;
@@ -825,8 +825,8 @@ static void external_snapshot_prepare(BlkTransactionStates *common,
const char *new_image_file;
const char *format = "qcow2";
enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
- ExternalSnapshotStates *states =
- DO_UPCAST(ExternalSnapshotStates, common, common);
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
TransactionAction *action = common->action;
/* get parameters */
@@ -848,36 +848,36 @@ static void external_snapshot_prepare(BlkTransactionStates *common,
return;
}
- states->old_bs = bdrv_find(device);
- if (!states->old_bs) {
+ state->old_bs = bdrv_find(device);
+ if (!state->old_bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
- if (!bdrv_is_inserted(states->old_bs)) {
+ if (!bdrv_is_inserted(state->old_bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
- if (bdrv_in_use(states->old_bs)) {
+ if (bdrv_in_use(state->old_bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
- if (!bdrv_is_read_only(states->old_bs)) {
- if (bdrv_flush(states->old_bs)) {
+ if (!bdrv_is_read_only(state->old_bs)) {
+ if (bdrv_flush(state->old_bs)) {
error_set(errp, QERR_IO_ERROR);
return;
}
}
- flags = states->old_bs->open_flags;
+ flags = state->old_bs->open_flags;
/* create new image w/backing file */
if (mode != NEW_IMAGE_MODE_EXISTING) {
bdrv_img_create(new_image_file, format,
- states->old_bs->filename,
- states->old_bs->drv->format_name,
+ state->old_bs->filename,
+ state->old_bs->drv->format_name,
NULL, -1, flags, &local_err, false);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
@@ -886,42 +886,42 @@ static void external_snapshot_prepare(BlkTransactionStates *common,
}
/* We will manually add the backing_hd field to the bs later */
- states->new_bs = bdrv_new("");
+ state->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
- ret = bdrv_open(states->new_bs, new_image_file, NULL,
+ ret = bdrv_open(state->new_bs, new_image_file, NULL,
flags | BDRV_O_NO_BACKING, drv);
if (ret != 0) {
error_setg_file_open(errp, -ret, new_image_file);
}
}
-static void external_snapshot_commit(BlkTransactionStates *common)
+static void external_snapshot_commit(BlkTransactionState *common)
{
- ExternalSnapshotStates *states =
- DO_UPCAST(ExternalSnapshotStates, common, common);
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
- /* This removes our old bs from the bdrv_states, and adds the new bs */
- bdrv_append(states->new_bs, states->old_bs);
+ /* This removes our old bs and adds the new bs */
+ bdrv_append(state->new_bs, state->old_bs);
/* We don't need (or want) to use the transactional
* bdrv_reopen_multiple() across all the entries at once, because we
* don't want to abort all of them if one of them fails the reopen */
- bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
+ bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}
-static void external_snapshot_abort(BlkTransactionStates *common)
+static void external_snapshot_abort(BlkTransactionState *common)
{
- ExternalSnapshotStates *states =
- DO_UPCAST(ExternalSnapshotStates, common, common);
- if (states->new_bs) {
- bdrv_delete(states->new_bs);
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
+ if (state->new_bs) {
+ bdrv_delete(state->new_bs);
}
}
static const BdrvActionOps actions[] = {
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
- .instance_size = sizeof(ExternalSnapshotStates),
+ .instance_size = sizeof(ExternalSnapshotState),
.prepare = external_snapshot_prepare,
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
@@ -936,10 +936,10 @@ static const BdrvActionOps actions[] = {
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
{
TransactionActionList *dev_entry = dev_list;
- BlkTransactionStates *states, *next;
+ BlkTransactionState *state, *next;
Error *local_err = NULL;
- QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
+ QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
QSIMPLEQ_INIT(&snap_bdrv_states);
/* drain all i/o before any snapshots */
@@ -956,20 +956,20 @@ void qmp_transaction(TransactionActionList *dev_list, Error **errp)
assert(dev_info->kind < ARRAY_SIZE(actions));
ops = &actions[dev_info->kind];
- states = g_malloc0(ops->instance_size);
- states->ops = ops;
- states->action = dev_info;
- QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
+ state = g_malloc0(ops->instance_size);
+ state->ops = ops;
+ state->action = dev_info;
+ QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
- states->ops->prepare(states, &local_err);
+ state->ops->prepare(state, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
}
- QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
- states->ops->commit(states);
+ QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ state->ops->commit(state);
}
/* success */
@@ -980,17 +980,17 @@ delete_and_fail:
* failure, and it is all-or-none; abandon each new bs, and keep using
* the original bs for all images
*/
- QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
- if (states->ops->abort) {
- states->ops->abort(states);
+ QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ if (state->ops->abort) {
+ state->ops->abort(state);
}
}
exit:
- QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
- if (states->ops->clean) {
- states->ops->clean(states);
+ QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
+ if (state->ops->clean) {
+ state->ops->clean(state);
}
- g_free(states);
+ g_free(state);
}
}
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 09/20] blockdev: allow BdrvActionOps->commit() to be NULL
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (7 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 08/20] blockdev: rename BlkTransactionStates to singular Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:24 ` [Qemu-devel] [PULL 10/20] blockdev: add DriveBackup transaction Kevin Wolf
` (10 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
Some QMP 'transaction' types don't need to do anything on .commit().
Make .commit() optional just like .abort().
The "drive-backup" action will take advantage of this, it only needs to
cancel the block job on .abort(). Other block job actions will probably
follow the same pattern, so allow .commit() to be NULL.
Suggested-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 5312e60..0cf8081 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -789,7 +789,7 @@ typedef struct BdrvActionOps {
size_t instance_size;
/* Prepare the work, must NOT be NULL. */
void (*prepare)(BlkTransactionState *common, Error **errp);
- /* Commit the changes, must NOT be NULL. */
+ /* Commit the changes, can be NULL. */
void (*commit)(BlkTransactionState *common);
/* Abort the changes on fail, can be NULL. */
void (*abort)(BlkTransactionState *common);
@@ -969,7 +969,9 @@ void qmp_transaction(TransactionActionList *dev_list, Error **errp)
}
QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
- state->ops->commit(state);
+ if (state->ops->commit) {
+ state->ops->commit(state);
+ }
}
/* success */
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 10/20] blockdev: add DriveBackup transaction
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (8 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 09/20] blockdev: allow BdrvActionOps->commit() to be NULL Kevin Wolf
@ 2013-06-28 14:24 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 11/20] blockdev: add Abort transaction Kevin Wolf
` (9 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:24 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
This patch adds a transactional version of the drive-backup QMP command.
It allows atomic snapshots of multiple drives along with automatic
cleanup if there is a failure to start one of the backup jobs.
Note that QMP events are emitted for block job completion/cancellation
and the block job will be listed by query-block-jobs.
@device: the name of the device whose writes should be mirrored.
@target: the target of the new image. If the file exists, or if it
is a device, the existing file/device will be used as the new
destination. If it does not exist, a new file will be created.
@format: #optional the format of the new destination, default is to
probe if @mode is 'existing', else the format of the source
@mode: #optional whether and how QEMU should create a new image, default is
'absolute-paths'.
@speed: #optional the maximum speed, in bytes per second
@on-source-error: #optional the action to take on an error on the source,
default 'report'. 'stop' and 'enospc' can only be used
if the block device supports io-status (see BlockInfo).
@on-target-error: #optional the action to take on an error on the target,
default 'report' (no limitations, since this applies to
a different block device than @device).
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
qapi-schema.json | 40 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 88 insertions(+), 1 deletion(-)
diff --git a/blockdev.c b/blockdev.c
index 0cf8081..6200c0d 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -919,6 +919,50 @@ static void external_snapshot_abort(BlkTransactionState *common)
}
}
+typedef struct DriveBackupState {
+ BlkTransactionState common;
+ BlockDriverState *bs;
+ BlockJob *job;
+} DriveBackupState;
+
+static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
+{
+ DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
+ DriveBackup *backup;
+ Error *local_err = NULL;
+
+ assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
+ backup = common->action->drive_backup;
+
+ qmp_drive_backup(backup->device, backup->target,
+ backup->has_format, backup->format,
+ backup->has_mode, backup->mode,
+ backup->has_speed, backup->speed,
+ backup->has_on_source_error, backup->on_source_error,
+ backup->has_on_target_error, backup->on_target_error,
+ &local_err);
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ state->bs = NULL;
+ state->job = NULL;
+ return;
+ }
+
+ state->bs = bdrv_find(backup->device);
+ state->job = state->bs->job;
+}
+
+static void drive_backup_abort(BlkTransactionState *common)
+{
+ DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
+ BlockDriverState *bs = state->bs;
+
+ /* Only cancel if it's the job we started */
+ if (bs && bs->job && bs->job == state->job) {
+ block_job_cancel_sync(bs->job);
+ }
+}
+
static const BdrvActionOps actions[] = {
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
.instance_size = sizeof(ExternalSnapshotState),
@@ -926,6 +970,11 @@ static const BdrvActionOps actions[] = {
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
},
+ [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
+ .instance_size = sizeof(DriveBackupState),
+ .prepare = drive_backup_prepare,
+ .abort = drive_backup_abort,
+ },
};
/*
diff --git a/qapi-schema.json b/qapi-schema.json
index 6fe7efc..714108d 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1623,6 +1623,43 @@
'*mode': 'NewImageMode' } }
##
+# @DriveBackup
+#
+# @device: the name of the device which should be copied.
+#
+# @target: the target of the new image. If the file exists, or if it
+# is a device, the existing file/device will be used as the new
+# destination. If it does not exist, a new file will be created.
+#
+# @format: #optional the format of the new destination, default is to
+# probe if @mode is 'existing', else the format of the source
+#
+# @mode: #optional whether and how QEMU should create a new image, default is
+# 'absolute-paths'.
+#
+# @speed: #optional the maximum speed, in bytes per second
+#
+# @on-source-error: #optional the action to take on an error on the source,
+# default 'report'. 'stop' and 'enospc' can only be used
+# if the block device supports io-status (see BlockInfo).
+#
+# @on-target-error: #optional the action to take on an error on the target,
+# default 'report' (no limitations, since this applies to
+# a different block device than @device).
+#
+# Note that @on-source-error and @on-target-error only affect background I/O.
+# If an error occurs during a guest write request, the device's rerror/werror
+# actions will be used.
+#
+# Since: 1.6
+##
+{ 'type': 'DriveBackup',
+ 'data': { 'device': 'str', 'target': 'str', '*format': 'str',
+ '*mode': 'NewImageMode', '*speed': 'int',
+ '*on-source-error': 'BlockdevOnError',
+ '*on-target-error': 'BlockdevOnError' } }
+
+##
# @TransactionAction
#
# A discriminated record of operations that can be performed with
@@ -1630,7 +1667,8 @@
##
{ 'union': 'TransactionAction',
'data': {
- 'blockdev-snapshot-sync': 'BlockdevSnapshot'
+ 'blockdev-snapshot-sync': 'BlockdevSnapshot',
+ 'drive-backup': 'DriveBackup'
} }
##
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 11/20] blockdev: add Abort transaction
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (9 preceding siblings ...)
2013-06-28 14:24 ` [Qemu-devel] [PULL 10/20] blockdev: add DriveBackup transaction Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 12/20] qemu-iotests: extract wait_until_completed() into iotests.py Kevin Wolf
` (8 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
The Abort action can be used to test QMP 'transaction' failure. Add it
as the last action to exercise the .abort() and .cleanup() code paths
for all previous actions.
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 15 +++++++++++++++
qapi-schema.json | 13 ++++++++++++-
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/blockdev.c b/blockdev.c
index 6200c0d..b3a57e0 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -963,6 +963,16 @@ static void drive_backup_abort(BlkTransactionState *common)
}
}
+static void abort_prepare(BlkTransactionState *common, Error **errp)
+{
+ error_setg(errp, "Transaction aborted using Abort action");
+}
+
+static void abort_commit(BlkTransactionState *common)
+{
+ assert(false); /* this action never succeeds */
+}
+
static const BdrvActionOps actions[] = {
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
.instance_size = sizeof(ExternalSnapshotState),
@@ -975,6 +985,11 @@ static const BdrvActionOps actions[] = {
.prepare = drive_backup_prepare,
.abort = drive_backup_abort,
},
+ [TRANSACTION_ACTION_KIND_ABORT] = {
+ .instance_size = sizeof(BlkTransactionState),
+ .prepare = abort_prepare,
+ .commit = abort_commit,
+ },
};
/*
diff --git a/qapi-schema.json b/qapi-schema.json
index 714108d..6590307 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1660,6 +1660,16 @@
'*on-target-error': 'BlockdevOnError' } }
##
+# @Abort
+#
+# This action can be used to test transaction failure.
+#
+# Since: 1.6
+###
+{ 'type': 'Abort',
+ 'data': { } }
+
+##
# @TransactionAction
#
# A discriminated record of operations that can be performed with
@@ -1668,7 +1678,8 @@
{ 'union': 'TransactionAction',
'data': {
'blockdev-snapshot-sync': 'BlockdevSnapshot',
- 'drive-backup': 'DriveBackup'
+ 'drive-backup': 'DriveBackup',
+ 'abort': 'Abort'
} }
##
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 12/20] qemu-iotests: extract wait_until_completed() into iotests.py
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (10 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 11/20] blockdev: add Abort transaction Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 13/20] qemu-iotests: add 055 drive-backup test case Kevin Wolf
` (7 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
The 'drive-mirror' tests often issue 'block-job-complete' and wait for
the QMP completion event. Other types of block jobs also want to wait
for completion but they may not need to issue 'block-job-complete'.
Extract wait_until_completed() from 041 and put it into iotests.py.
Return the QMP event object so the caller can make additional
assertions, if necessary.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
tests/qemu-iotests/041 | 14 ++------------
tests/qemu-iotests/iotests.py | 15 +++++++++++++++
2 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/tests/qemu-iotests/041 b/tests/qemu-iotests/041
index 1e923e7..6661c03 100755
--- a/tests/qemu-iotests/041
+++ b/tests/qemu-iotests/041
@@ -57,18 +57,8 @@ class ImageMirroringTestCase(iotests.QMPTestCase):
result = self.vm.qmp('block-job-complete', device=drive)
self.assert_qmp(result, 'return', {})
- completed = False
- while not completed:
- for event in self.vm.get_qmp_events(wait=True):
- if event['event'] == 'BLOCK_JOB_COMPLETED':
- self.assert_qmp(event, 'data/type', 'mirror')
- self.assert_qmp(event, 'data/device', drive)
- self.assert_qmp_absent(event, 'data/error')
- self.assert_qmp(event, 'data/offset', self.image_len)
- self.assert_qmp(event, 'data/len', self.image_len)
- completed = True
-
- self.assert_no_active_block_jobs()
+ event = self.wait_until_completed()
+ self.assert_qmp(event, 'data/type', 'mirror')
class TestSingleDrive(ImageMirroringTestCase):
image_len = 1 * 1024 * 1024 # MB
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 8a8f181..b028a89 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -208,6 +208,21 @@ class QMPTestCase(unittest.TestCase):
self.assert_no_active_block_jobs()
return result
+ def wait_until_completed(self, drive='drive0'):
+ '''Wait for a block job to finish, returning the event'''
+ completed = False
+ while not completed:
+ for event in self.vm.get_qmp_events(wait=True):
+ if event['event'] == 'BLOCK_JOB_COMPLETED':
+ self.assert_qmp(event, 'data/device', drive)
+ self.assert_qmp_absent(event, 'data/error')
+ self.assert_qmp(event, 'data/offset', self.image_len)
+ self.assert_qmp(event, 'data/len', self.image_len)
+ completed = True
+
+ self.assert_no_active_block_jobs()
+ return event
+
def notrun(reason):
'''Skip this test suite'''
# Each test in qemu-iotests has a number ("seq")
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 13/20] qemu-iotests: add 055 drive-backup test case
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (11 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 12/20] qemu-iotests: extract wait_until_completed() into iotests.py Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 14/20] block: Make BlockJobTypes const Kevin Wolf
` (6 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Stefan Hajnoczi <stefanha@redhat.com>
Testing drive-backup is similar to image streaming and drive mirroring.
This test case is based on 041.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
tests/qemu-iotests/055 | 282 +++++++++++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/055.out | 5 +
tests/qemu-iotests/group | 1 +
3 files changed, 288 insertions(+)
create mode 100755 tests/qemu-iotests/055
create mode 100644 tests/qemu-iotests/055.out
diff --git a/tests/qemu-iotests/055 b/tests/qemu-iotests/055
new file mode 100755
index 0000000..887c959
--- /dev/null
+++ b/tests/qemu-iotests/055
@@ -0,0 +1,282 @@
+#!/usr/bin/env python
+#
+# Tests for drive-backup
+#
+# Copyright (C) 2013 Red Hat, Inc.
+#
+# Based on 041.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import time
+import os
+import iotests
+from iotests import qemu_img, qemu_io
+
+test_img = os.path.join(iotests.test_dir, 'test.img')
+target_img = os.path.join(iotests.test_dir, 'target.img')
+
+class TestSingleDrive(iotests.QMPTestCase):
+ image_len = 64 * 1024 * 1024 # MB
+
+ def setUp(self):
+ # Write data to the image so we can compare later
+ qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleDrive.image_len))
+ qemu_io('-c', 'write -P0x5d 0 64k', test_img)
+ qemu_io('-c', 'write -P0xd5 1M 32k', test_img)
+ qemu_io('-c', 'write -P0xdc 32M 124k', test_img)
+ qemu_io('-c', 'write -P0xdc 67043328 64k', test_img)
+
+ self.vm = iotests.VM().add_drive(test_img)
+ self.vm.launch()
+
+ def tearDown(self):
+ self.vm.shutdown()
+ os.remove(test_img)
+ try:
+ os.remove(target_img)
+ except OSError:
+ pass
+
+ def test_cancel(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img)
+ self.assert_qmp(result, 'return', {})
+
+ event = self.cancel_and_wait()
+ self.assert_qmp(event, 'data/type', 'backup')
+
+ def test_pause(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img)
+ self.assert_qmp(result, 'return', {})
+
+ result = self.vm.qmp('block-job-pause', device='drive0')
+ self.assert_qmp(result, 'return', {})
+
+ time.sleep(1)
+ result = self.vm.qmp('query-block-jobs')
+ offset = self.dictpath(result, 'return[0]/offset')
+
+ time.sleep(1)
+ result = self.vm.qmp('query-block-jobs')
+ self.assert_qmp(result, 'return[0]/offset', offset)
+
+ result = self.vm.qmp('block-job-resume', device='drive0')
+ self.assert_qmp(result, 'return', {})
+
+ self.wait_until_completed()
+
+ self.vm.shutdown()
+ self.assertTrue(iotests.compare_images(test_img, target_img),
+ 'target image does not match source after backup')
+
+ def test_medium_not_found(self):
+ result = self.vm.qmp('drive-backup', device='ide1-cd0',
+ target=target_img)
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ def test_image_not_found(self):
+ result = self.vm.qmp('drive-backup', device='drive0',
+ mode='existing', target=target_img)
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ def test_device_not_found(self):
+ result = self.vm.qmp('drive-backup', device='nonexistent',
+ target=target_img)
+ self.assert_qmp(result, 'error/class', 'DeviceNotFound')
+
+class TestSetSpeed(iotests.QMPTestCase):
+ image_len = 80 * 1024 * 1024 # MB
+
+ def setUp(self):
+ qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSetSpeed.image_len))
+ self.vm = iotests.VM().add_drive(test_img)
+ self.vm.launch()
+
+ def tearDown(self):
+ self.vm.shutdown()
+ os.remove(test_img)
+ os.remove(target_img)
+
+ def test_set_speed(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img)
+ self.assert_qmp(result, 'return', {})
+
+ # Default speed is 0
+ result = self.vm.qmp('query-block-jobs')
+ self.assert_qmp(result, 'return[0]/device', 'drive0')
+ self.assert_qmp(result, 'return[0]/speed', 0)
+
+ result = self.vm.qmp('block-job-set-speed', device='drive0', speed=8 * 1024 * 1024)
+ self.assert_qmp(result, 'return', {})
+
+ # Ensure the speed we set was accepted
+ result = self.vm.qmp('query-block-jobs')
+ self.assert_qmp(result, 'return[0]/device', 'drive0')
+ self.assert_qmp(result, 'return[0]/speed', 8 * 1024 * 1024)
+
+ event = self.cancel_and_wait()
+ self.assert_qmp(event, 'data/type', 'backup')
+
+ # Check setting speed in drive-backup works
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img, speed=4*1024*1024)
+ self.assert_qmp(result, 'return', {})
+
+ result = self.vm.qmp('query-block-jobs')
+ self.assert_qmp(result, 'return[0]/device', 'drive0')
+ self.assert_qmp(result, 'return[0]/speed', 4 * 1024 * 1024)
+
+ event = self.cancel_and_wait()
+ self.assert_qmp(event, 'data/type', 'backup')
+
+ def test_set_speed_invalid(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img, speed=-1)
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('drive-backup', device='drive0',
+ target=target_img)
+ self.assert_qmp(result, 'return', {})
+
+ result = self.vm.qmp('block-job-set-speed', device='drive0', speed=-1)
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ event = self.cancel_and_wait()
+ self.assert_qmp(event, 'data/type', 'backup')
+
+class TestSingleTransaction(iotests.QMPTestCase):
+ image_len = 64 * 1024 * 1024 # MB
+
+ def setUp(self):
+ qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleTransaction.image_len))
+ qemu_io('-c', 'write -P0x5d 0 64k', test_img)
+ qemu_io('-c', 'write -P0xd5 1M 32k', test_img)
+ qemu_io('-c', 'write -P0xdc 32M 124k', test_img)
+ qemu_io('-c', 'write -P0xdc 67043328 64k', test_img)
+
+ self.vm = iotests.VM().add_drive(test_img)
+ self.vm.launch()
+
+ def tearDown(self):
+ self.vm.shutdown()
+ os.remove(test_img)
+ try:
+ os.remove(target_img)
+ except OSError:
+ pass
+
+ def test_cancel(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'drive0',
+ 'target': target_img },
+ }
+ ])
+ self.assert_qmp(result, 'return', {})
+
+ event = self.cancel_and_wait()
+ self.assert_qmp(event, 'data/type', 'backup')
+
+ def test_pause(self):
+ self.assert_no_active_block_jobs()
+
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'drive0',
+ 'target': target_img },
+ }
+ ])
+ self.assert_qmp(result, 'return', {})
+
+ result = self.vm.qmp('block-job-pause', device='drive0')
+ self.assert_qmp(result, 'return', {})
+
+ time.sleep(1)
+ result = self.vm.qmp('query-block-jobs')
+ offset = self.dictpath(result, 'return[0]/offset')
+
+ time.sleep(1)
+ result = self.vm.qmp('query-block-jobs')
+ self.assert_qmp(result, 'return[0]/offset', offset)
+
+ result = self.vm.qmp('block-job-resume', device='drive0')
+ self.assert_qmp(result, 'return', {})
+
+ self.wait_until_completed()
+
+ self.vm.shutdown()
+ self.assertTrue(iotests.compare_images(test_img, target_img),
+ 'target image does not match source after backup')
+
+ def test_medium_not_found(self):
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'ide1-cd0',
+ 'target': target_img },
+ }
+ ])
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ def test_image_not_found(self):
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'drive0',
+ 'mode': 'existing',
+ 'target': target_img },
+ }
+ ])
+ self.assert_qmp(result, 'error/class', 'GenericError')
+
+ def test_device_not_found(self):
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'nonexistent',
+ 'mode': 'existing',
+ 'target': target_img },
+ }
+ ])
+ self.assert_qmp(result, 'error/class', 'DeviceNotFound')
+
+ def test_abort(self):
+ result = self.vm.qmp('transaction', actions=[{
+ 'type': 'drive-backup',
+ 'data': { 'device': 'nonexistent',
+ 'mode': 'existing',
+ 'target': target_img },
+ }, {
+ 'type': 'Abort',
+ 'data': {},
+ }
+ ])
+ self.assert_qmp(result, 'error/class', 'GenericError')
+ self.assert_no_active_block_jobs()
+
+if __name__ == '__main__':
+ iotests.main(supported_fmts=['raw', 'qcow2'])
diff --git a/tests/qemu-iotests/055.out b/tests/qemu-iotests/055.out
new file mode 100644
index 0000000..fa16b5c
--- /dev/null
+++ b/tests/qemu-iotests/055.out
@@ -0,0 +1,5 @@
+.............
+----------------------------------------------------------------------
+Ran 13 tests
+
+OK
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index f487a8f..fdc6ed1 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -61,3 +61,4 @@
052 rw auto backing
053 rw auto
054 rw auto
+055 rw auto
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 14/20] block: Make BlockJobTypes const
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (12 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 13/20] qemu-iotests: add 055 drive-backup test case Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 15/20] block/ssh: Set bdrv_has_zero_init according to the file type Kevin Wolf
` (5 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/commit.c | 2 +-
block/mirror.c | 2 +-
block/stream.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/block/commit.c b/block/commit.c
index 553447e..2227fc2 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -173,7 +173,7 @@ static void commit_set_speed(BlockJob *job, int64_t speed, Error **errp)
ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
}
-static BlockJobType commit_job_type = {
+static const BlockJobType commit_job_type = {
.instance_size = sizeof(CommitBlockJob),
.job_type = "commit",
.set_speed = commit_set_speed,
diff --git a/block/mirror.c b/block/mirror.c
index 1ae724f..bed4a7e 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -524,7 +524,7 @@ static void mirror_complete(BlockJob *job, Error **errp)
block_job_resume(job);
}
-static BlockJobType mirror_job_type = {
+static const BlockJobType mirror_job_type = {
.instance_size = sizeof(MirrorBlockJob),
.job_type = "mirror",
.set_speed = mirror_set_speed,
diff --git a/block/stream.c b/block/stream.c
index d6df06f..7fe9e48 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -198,7 +198,7 @@ static void stream_set_speed(BlockJob *job, int64_t speed, Error **errp)
ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
}
-static BlockJobType stream_job_type = {
+static const BlockJobType stream_job_type = {
.instance_size = sizeof(StreamBlockJob),
.job_type = "stream",
.set_speed = stream_set_speed,
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 15/20] block/ssh: Set bdrv_has_zero_init according to the file type.
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (13 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 14/20] block: Make BlockJobTypes const Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 16/20] gluster: Return bdrv_has_zero_init = 0 Kevin Wolf
` (4 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: "Richard W.M. Jones" <rjones@redhat.com>
If the remote is a regular file, set it to true (ie. reads of
uninitialized areas in a newly created file will return zeroes).
If we can't prove that, return false (a safe default).
Tested by adding a debugging print statement [not part of this commit]
and creating a remote file and a remote block device:
$ ./qemu-img create ssh://localhost/tmp/new 100M
Formatting 'ssh://localhost/tmp/new', fmt=raw size=104857600
filename ssh://localhost/tmp/new: has_zero_init = 1
$ sudo lvcreate -L 1G -n tmp /dev/fedora
Logical volume "tmp" created
$ ./qemu-img create ssh://localhost/dev/fedora/tmp 1G
Formatting 'ssh://localhost/dev/fedora/tmp', fmt=raw size=1073741824
filename ssh://localhost/dev/fedora/tmp: has_zero_init = 0
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/ssh.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/block/ssh.c b/block/ssh.c
index 246a70d..d7e7bf8 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -716,6 +716,21 @@ static void ssh_close(BlockDriverState *bs)
ssh_state_free(s);
}
+static int ssh_has_zero_init(BlockDriverState *bs)
+{
+ BDRVSSHState *s = bs->opaque;
+ /* Assume false, unless we can positively prove it's true. */
+ int has_zero_init = 0;
+
+ if (s->attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) {
+ if (s->attrs.permissions & LIBSSH2_SFTP_S_IFREG) {
+ has_zero_init = 1;
+ }
+ }
+
+ return has_zero_init;
+}
+
static void restart_coroutine(void *opaque)
{
Coroutine *co = opaque;
@@ -1037,6 +1052,7 @@ static BlockDriver bdrv_ssh = {
.bdrv_file_open = ssh_file_open,
.bdrv_create = ssh_create,
.bdrv_close = ssh_close,
+ .bdrv_has_zero_init = ssh_has_zero_init,
.bdrv_co_readv = ssh_co_readv,
.bdrv_co_writev = ssh_co_writev,
.bdrv_getlength = ssh_getlength,
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 16/20] gluster: Return bdrv_has_zero_init = 0
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (14 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 15/20] block/ssh: Set bdrv_has_zero_init according to the file type Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 17/20] vmdk: remove wrong calculation of relative path Kevin Wolf
` (3 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
GlusterFS volumes can be backed by block devices, in which case
bdrv_create() doesn't make sure that the image is zeroed out. It is
currently not possibly to detect whether a given image is backed by a
file or a block device, and incorrectly assuming that it is zeroed
corrupts images during qemu-img convert, so let's err on the side of
caution and always return 0.
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/gluster.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/block/gluster.c b/block/gluster.c
index 91acde2..61424bc 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -574,6 +574,12 @@ static void qemu_gluster_close(BlockDriverState *bs)
glfs_fini(s->glfs);
}
+static int qemu_gluster_has_zero_init(BlockDriverState *bs)
+{
+ /* GlusterFS volume could be backed by a block device */
+ return 0;
+}
+
static QEMUOptionParameter qemu_gluster_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
@@ -595,6 +601,7 @@ static BlockDriver bdrv_gluster = {
.bdrv_aio_readv = qemu_gluster_aio_readv,
.bdrv_aio_writev = qemu_gluster_aio_writev,
.bdrv_aio_flush = qemu_gluster_aio_flush,
+ .bdrv_has_zero_init = qemu_gluster_has_zero_init,
.create_options = qemu_gluster_create_options,
};
@@ -610,6 +617,7 @@ static BlockDriver bdrv_gluster_tcp = {
.bdrv_aio_readv = qemu_gluster_aio_readv,
.bdrv_aio_writev = qemu_gluster_aio_writev,
.bdrv_aio_flush = qemu_gluster_aio_flush,
+ .bdrv_has_zero_init = qemu_gluster_has_zero_init,
.create_options = qemu_gluster_create_options,
};
@@ -625,6 +633,7 @@ static BlockDriver bdrv_gluster_unix = {
.bdrv_aio_readv = qemu_gluster_aio_readv,
.bdrv_aio_writev = qemu_gluster_aio_writev,
.bdrv_aio_flush = qemu_gluster_aio_flush,
+ .bdrv_has_zero_init = qemu_gluster_has_zero_init,
.create_options = qemu_gluster_create_options,
};
@@ -640,6 +649,7 @@ static BlockDriver bdrv_gluster_rdma = {
.bdrv_aio_readv = qemu_gluster_aio_readv,
.bdrv_aio_writev = qemu_gluster_aio_writev,
.bdrv_aio_flush = qemu_gluster_aio_flush,
+ .bdrv_has_zero_init = qemu_gluster_has_zero_init,
.create_options = qemu_gluster_create_options,
};
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 17/20] vmdk: remove wrong calculation of relative path
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (15 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 16/20] gluster: Return bdrv_has_zero_init = 0 Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 18/20] vpc: Implement .bdrv_has_zero_init Kevin Wolf
` (2 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Fam Zheng <famz@redhat.com>
When creating image with backing file, the driver tries to calculate the
relative path from created image file to backing file, but the path
computation is incorrect. e.g.:
$ qemu-img create -f vmdk -b vmdk-data-disk.vmdk vmdk-data-snapshot1
Formatting 'vmdk-data-snapshot1', fmt=vmdk size=10737418240
backing_file='vmdk-data-disk.vmdk' compat6=off zeroed_grain=off
$ qemu-img info vmdk-data-snapshot1
image: vmdk-data-snapshot1
file format: vmdk
virtual size: 10G (10737418240 bytes)
disk size: 12K
-> backing file: disk.vmdk
The common part in file names, "vmdk-data-", is incorrectly forgotten by
relative_path(). As the VMDK specification has no restriction on
parentNameHint to be relative path, we simply remove this by using the
backing_file option.
Cc: qemu-stable@nongnu.org
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/vmdk.c | 44 +-------------------------------------------
1 file changed, 1 insertion(+), 43 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index 975e1d4..a28fb5e 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1487,45 +1487,6 @@ static int filename_decompose(const char *filename, char *path, char *prefix,
return VMDK_OK;
}
-static int relative_path(char *dest, int dest_size,
- const char *base, const char *target)
-{
- int i = 0;
- int n = 0;
- const char *p, *q;
-#ifdef _WIN32
- const char *sep = "\\";
-#else
- const char *sep = "/";
-#endif
-
- if (!(dest && base && target)) {
- return VMDK_ERROR;
- }
- if (path_is_absolute(target)) {
- pstrcpy(dest, dest_size, target);
- return VMDK_OK;
- }
- while (base[i] == target[i]) {
- i++;
- }
- p = &base[i];
- q = &target[i];
- while (*p) {
- if (*p == *sep) {
- n++;
- }
- p++;
- }
- dest[0] = '\0';
- for (; n; n--) {
- pstrcat(dest, dest_size, "..");
- pstrcat(dest, dest_size, sep);
- }
- pstrcat(dest, dest_size, q);
- return VMDK_OK;
-}
-
static int vmdk_create(const char *filename, QEMUOptionParameter *options)
{
int fd, idx = 0;
@@ -1625,7 +1586,6 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
return -ENOTSUP;
}
if (backing_file) {
- char parent_filename[PATH_MAX];
BlockDriverState *bs = bdrv_new("");
ret = bdrv_open(bs, backing_file, NULL, 0, NULL);
if (ret != 0) {
@@ -1638,10 +1598,8 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
}
parent_cid = vmdk_read_cid(bs, 0);
bdrv_delete(bs);
- relative_path(parent_filename, sizeof(parent_filename),
- filename, backing_file);
snprintf(parent_desc_line, sizeof(parent_desc_line),
- "parentFileNameHint=\"%s\"", parent_filename);
+ "parentFileNameHint=\"%s\"", backing_file);
}
/* Create extents */
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 18/20] vpc: Implement .bdrv_has_zero_init
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (16 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 17/20] vmdk: remove wrong calculation of relative path Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 19/20] block: change default of .has_zero_init to 0 Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 20/20] cmd646: fix build when DEBUG_IDE is enabled Kevin Wolf
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
Depending on the subformat, has_zero_init on VHD must behave like raw
and query the underlying storage (fixed) or like other sparse formats
that can always return 1 (dynamic, differencing).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/vpc.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/block/vpc.c b/block/vpc.c
index 3cad52e..fe4f311 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -786,6 +786,18 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
return ret;
}
+static int vpc_has_zero_init(BlockDriverState *bs)
+{
+ BDRVVPCState *s = bs->opaque;
+ struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
+
+ if (cpu_to_be32(footer->type) == VHD_FIXED) {
+ return bdrv_has_zero_init(bs->file);
+ } else {
+ return 1;
+ }
+}
+
static void vpc_close(BlockDriverState *bs)
{
BDRVVPCState *s = bs->opaque;
@@ -818,16 +830,17 @@ static BlockDriver bdrv_vpc = {
.format_name = "vpc",
.instance_size = sizeof(BDRVVPCState),
- .bdrv_probe = vpc_probe,
- .bdrv_open = vpc_open,
- .bdrv_close = vpc_close,
- .bdrv_reopen_prepare = vpc_reopen_prepare,
- .bdrv_create = vpc_create,
+ .bdrv_probe = vpc_probe,
+ .bdrv_open = vpc_open,
+ .bdrv_close = vpc_close,
+ .bdrv_reopen_prepare = vpc_reopen_prepare,
+ .bdrv_create = vpc_create,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
- .create_options = vpc_create_options,
+ .create_options = vpc_create_options,
+ .bdrv_has_zero_init = vpc_has_zero_init,
};
static void bdrv_vpc_init(void)
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 19/20] block: change default of .has_zero_init to 0
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (17 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 18/20] vpc: Implement .bdrv_has_zero_init Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
2013-06-28 14:25 ` [Qemu-devel] [PULL 20/20] cmd646: fix build when DEBUG_IDE is enabled Kevin Wolf
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Peter Lieven <pl@kamp.de>
.has_zero_init defaults to 1 for all formats and protocols.
this is a dangerous default since this means that all
new added drivers need to manually overwrite it to 0 if
they do not ensure that a device is zero initialized
after bdrv_create().
if a driver needs to explicitly set this value to
1 its easier to verify the correctness in the review process.
during review of the existing drivers it turned out
that ssh and gluster had a wrong default of 1.
both protocols support host_devices as backend
which are not by default zero initialized. this
wrong assumption will lead to possible corruption
if qemu-img convert is used to write to such a backend.
vpc and vmdk also defaulted to 1 altough they support
fixed respectively flat extends. this has to be addresses
in separate patches. both formats as well as the mentioned
ssh and gluster are turned to the default of 0 with this
patch for safety.
a similar problem with the wrong default existed for
iscsi most likely because the driver developer did
oversee the default value of 1.
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block.c | 8 +++++++-
block/cow.c | 1 +
block/qcow.c | 1 +
block/qcow2.c | 1 +
block/qed.c | 1 +
block/raw-posix.c | 10 +---------
block/raw-win32.c | 7 +------
block/rbd.c | 1 +
block/sheepdog.c | 1 +
block/vdi.c | 1 +
include/block/block.h | 1 +
11 files changed, 17 insertions(+), 16 deletions(-)
diff --git a/block.c b/block.c
index 0898f6b..6c493ad 100644
--- a/block.c
+++ b/block.c
@@ -2911,6 +2911,11 @@ void bdrv_flush_all(void)
}
}
+int bdrv_has_zero_init_1(BlockDriverState *bs)
+{
+ return 1;
+}
+
int bdrv_has_zero_init(BlockDriverState *bs)
{
assert(bs->drv);
@@ -2919,7 +2924,8 @@ int bdrv_has_zero_init(BlockDriverState *bs)
return bs->drv->bdrv_has_zero_init(bs);
}
- return 1;
+ /* safe default */
+ return 0;
}
typedef struct BdrvCoIsAllocatedData {
diff --git a/block/cow.c b/block/cow.c
index 9f94599..1cc2e89 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -340,6 +340,7 @@ static BlockDriver bdrv_cow = {
.bdrv_open = cow_open,
.bdrv_close = cow_close,
.bdrv_create = cow_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_read = cow_co_read,
.bdrv_write = cow_co_write,
diff --git a/block/qcow.c b/block/qcow.c
index e2a64c7..5239bd6 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -892,6 +892,7 @@ static BlockDriver bdrv_qcow = {
.bdrv_close = qcow_close,
.bdrv_reopen_prepare = qcow_reopen_prepare,
.bdrv_create = qcow_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
diff --git a/block/qcow2.c b/block/qcow2.c
index 9383990..0eceefe 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1785,6 +1785,7 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_close = qcow2_close,
.bdrv_reopen_prepare = qcow2_reopen_prepare,
.bdrv_create = qcow2_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = qcow2_co_is_allocated,
.bdrv_set_key = qcow2_set_key,
.bdrv_make_empty = qcow2_make_empty,
diff --git a/block/qed.c b/block/qed.c
index 4651403..f767b05 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1574,6 +1574,7 @@ static BlockDriver bdrv_qed = {
.bdrv_close = bdrv_qed_close,
.bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
.bdrv_create = bdrv_qed_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = bdrv_qed_co_is_allocated,
.bdrv_make_empty = bdrv_qed_make_empty,
.bdrv_aio_readv = bdrv_qed_aio_readv,
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 90ce9f8..ba721d3 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1199,6 +1199,7 @@ static BlockDriver bdrv_file = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = raw_co_is_allocated,
.bdrv_aio_readv = raw_aio_readv,
@@ -1527,11 +1528,6 @@ static int hdev_create(const char *filename, QEMUOptionParameter *options)
return ret;
}
-static int hdev_has_zero_init(BlockDriverState *bs)
-{
- return 0;
-}
-
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
@@ -1544,7 +1540,6 @@ static BlockDriver bdrv_host_device = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
- .bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
@@ -1669,7 +1664,6 @@ static BlockDriver bdrv_host_floppy = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
- .bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
@@ -1771,7 +1765,6 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
- .bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
@@ -1893,7 +1886,6 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
- .bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 7c03b6d..9b5b2af 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -459,6 +459,7 @@ static BlockDriver bdrv_file = {
.bdrv_file_open = raw_open,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
@@ -570,11 +571,6 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
return 0;
}
-static int hdev_has_zero_init(BlockDriverState *bs)
-{
- return 0;
-}
-
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
@@ -582,7 +578,6 @@ static BlockDriver bdrv_host_device = {
.bdrv_probe_device = hdev_probe_device,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
- .bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
diff --git a/block/rbd.c b/block/rbd.c
index 0f2608b..cb71751 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -996,6 +996,7 @@ static BlockDriver bdrv_rbd = {
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_create = qemu_rbd_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_get_info = qemu_rbd_getinfo,
.create_options = qemu_rbd_create_options,
.bdrv_getlength = qemu_rbd_getlength,
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 1b7c3f1..b397b5b 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2401,6 +2401,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_file_open = sd_open,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_truncate = sd_truncate,
diff --git a/block/vdi.c b/block/vdi.c
index 2662d89..8a91525 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -779,6 +779,7 @@ static BlockDriver bdrv_vdi = {
.bdrv_close = vdi_close,
.bdrv_reopen_prepare = vdi_reopen_prepare,
.bdrv_create = vdi_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = vdi_co_is_allocated,
.bdrv_make_empty = vdi_make_empty,
diff --git a/include/block/block.h b/include/block/block.h
index 2307f67..dd8eca1 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -272,6 +272,7 @@ void bdrv_drain_all(void);
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
+int bdrv_has_zero_init_1(BlockDriverState *bs);
int bdrv_has_zero_init(BlockDriverState *bs);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum);
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread* [Qemu-devel] [PULL 20/20] cmd646: fix build when DEBUG_IDE is enabled.
2013-06-28 14:24 [Qemu-devel] [PULL 00/20] Block patches Kevin Wolf
` (18 preceding siblings ...)
2013-06-28 14:25 ` [Qemu-devel] [PULL 19/20] block: change default of .has_zero_init to 0 Kevin Wolf
@ 2013-06-28 14:25 ` Kevin Wolf
19 siblings, 0 replies; 21+ messages in thread
From: Kevin Wolf @ 2013-06-28 14:25 UTC (permalink / raw)
To: anthony; +Cc: kwolf, qemu-devel
From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Make sure we use the correct TARGET/PRI macros in the debug statements.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
hw/ide/cmd646.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/ide/cmd646.c b/hw/ide/cmd646.c
index a73eb9a..9916701 100644
--- a/hw/ide/cmd646.c
+++ b/hw/ide/cmd646.c
@@ -154,7 +154,7 @@ static uint64_t bmdma_read(void *opaque, hwaddr addr,
break;
}
#ifdef DEBUG_IDE
- printf("bmdma: readb 0x%02x : 0x%02x\n", addr, val);
+ printf("bmdma: readb " TARGET_FMT_plx " : 0x%02x\n", addr, val);
#endif
return val;
}
@@ -170,7 +170,7 @@ static void bmdma_write(void *opaque, hwaddr addr,
}
#ifdef DEBUG_IDE
- printf("bmdma: writeb 0x%02x : 0x%02x\n", addr, val);
+ printf("bmdma: writeb " TARGET_FMT_plx " : 0x%" PRIx64 "\n", addr, val);
#endif
switch(addr & 3) {
case 0:
--
1.8.1.4
^ permalink raw reply related [flat|nested] 21+ messages in thread