From 12b3e52e4875ca018e033c66f1825437a005c239 Mon Sep 17 00:00:00 2001 From: John Snow Date: Tue, 26 Jan 2016 18:54:58 -0500 Subject: [PATCH] backup: Pack Notifier within BackupBlockJob 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 Signed-off-by: John Snow Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- block/backup.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/block/backup.c b/block/backup.c index a990cf15a2..a57288f1b6 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);