From: John Snow <js...@redhat.com>
Instead of relying on peeking at bs->job, we want to explicitly get
a reference to the job that was involved in this notifier callback.
Pack the Notifier inside of the BackupBlockJob so we can use
container_of to get a reference back to the BackupBlockJob object.
This cuts out one more case where we rely unnecessarily on bs->job.
Suggested-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: John Snow <js...@redhat.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
---
block/backup.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/block/backup.c b/block/backup.c
index a990cf1..a57288f 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -47,6 +47,7 @@ typedef struct BackupBlockJob {
uint64_t sectors_read;
unsigned long *done_bitmap;
int64_t cluster_size;
+ NotifierWithReturn before_write;
QLIST_HEAD(, CowRequest) inflight_reqs;
} BackupBlockJob;
@@ -94,11 +95,11 @@ static void cow_request_end(CowRequest *req)
}
static int coroutine_fn backup_do_cow(BlockDriverState *bs,
+ BackupBlockJob *job,
int64_t sector_num, int nb_sectors,
bool *error_is_read,
bool is_write_notifier)
{
- BackupBlockJob *job = (BackupBlockJob *)bs->job;
CowRequest cow_request;
struct iovec iov;
QEMUIOVector bounce_qiov;
@@ -197,6 +198,7 @@ static int coroutine_fn backup_before_write_notify(
NotifierWithReturn *notifier,
void *opaque)
{
+ BackupBlockJob *job = container_of(notifier, BackupBlockJob, before_write);
BdrvTrackedRequest *req = opaque;
int64_t sector_num = req->offset >> BDRV_SECTOR_BITS;
int nb_sectors = req->bytes >> BDRV_SECTOR_BITS;
@@ -204,7 +206,8 @@ static int coroutine_fn backup_before_write_notify(
assert((req->offset & (BDRV_SECTOR_SIZE - 1)) == 0);
assert((req->bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
- return backup_do_cow(req->bs, sector_num, nb_sectors, NULL, true);
+ return backup_do_cow(req->bs, job, sector_num,
+ nb_sectors, NULL, true);
}
static void backup_set_speed(BlockJob *job, int64_t speed, Error **errp)
@@ -343,7 +346,7 @@ static int coroutine_fn
backup_run_incremental(BackupBlockJob *job)
if (yield_and_check(job)) {
return ret;
}
- ret = backup_do_cow(bs, cluster * sectors_per_cluster,
+ ret = backup_do_cow(bs, job, cluster * sectors_per_cluster,
sectors_per_cluster, &error_is_read,
false);
if ((ret < 0) &&
@@ -378,9 +381,6 @@ static void coroutine_fn backup_run(void *opaque)
BackupCompleteData *data;
BlockDriverState *bs = job->common.bs;
BlockDriverState *target = job->target;
- NotifierWithReturn before_write = {
- .notify = backup_before_write_notify,
- };
int64_t start, end;
int64_t sectors_per_cluster = cluster_size_sectors(job);
int ret = 0;
@@ -393,7 +393,8 @@ static void coroutine_fn backup_run(void *opaque)
job->done_bitmap = bitmap_new(end);
- bdrv_add_before_write_notifier(bs, &before_write);
+ job->before_write.notify = backup_before_write_notify;
+ bdrv_add_before_write_notifier(bs, &job->before_write);
if (job->sync_mode == MIRROR_SYNC_MODE_NONE) {
while (!block_job_is_cancelled(&job->common)) {
@@ -445,7 +446,7 @@ static void coroutine_fn backup_run(void *opaque)
}
}
/* FULL sync mode we copy the whole drive. */
- ret = backup_do_cow(bs, start * sectors_per_cluster,
+ ret = backup_do_cow(bs, job, start * sectors_per_cluster,
sectors_per_cluster, &error_is_read, false);
if (ret < 0) {
/* Depending on error action, fail now or retry cluster */
@@ -461,7 +462,7 @@ static void coroutine_fn backup_run(void *opaque)
}
}
- notifier_with_return_remove(&before_write);
+ notifier_with_return_remove(&job->before_write);
/* wait until pending backup_do_cow() calls have completed */
qemu_co_rwlock_wrlock(&job->flush_rwlock);
--
1.8.3.1
