From dba433c03a0f5dc22a459435dd89557886298921 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 22 Feb 2013 17:36:17 +0100 Subject: migration: simplify error handling Always use qemu_file_get_error to detect errors, since that is how QEMUFile itself drops I/O after an error occurs. There is no need to propagate and check return values all the time. Also remove the "complete" member, since we know that it is set (via migrate_fd_cleanup) only when the state changes. Reviewed-by: Orit Wasserman Reviewed-by: Juan Quintela Signed-off-by: Paolo Bonzini Signed-off-by: Juan Quintela --- migration.c | 46 ++++++++++++++-------------------------------- 1 file changed, 14 insertions(+), 32 deletions(-) (limited to 'migration.c') diff --git a/migration.c b/migration.c index 939c3f7640..18f97cfed3 100644 --- a/migration.c +++ b/migration.c @@ -525,6 +525,10 @@ static void buffered_flush(MigrationState *s) DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size); + if (qemu_file_get_error(s->file)) { + s->buffer_size = 0; + return; + } qemu_fflush(s->file); while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) { @@ -592,7 +596,6 @@ static int buffered_close(void *opaque) while (!qemu_file_get_error(s->file) && s->buffer_size) { buffered_flush(s); } - s->complete = true; return migrate_fd_close(s); } @@ -656,37 +659,21 @@ static void *buffered_file_thread(void *opaque) int64_t sleep_time = 0; int64_t max_size = 0; bool last_round = false; - int ret; qemu_mutex_lock_iothread(); DPRINTF("beginning savevm\n"); - ret = qemu_savevm_state_begin(s->file, &s->params); - qemu_mutex_unlock_iothread(); + qemu_savevm_state_begin(s->file, &s->params); - while (ret >= 0) { + while (s->state == MIG_STATE_ACTIVE) { int64_t current_time; uint64_t pending_size; - qemu_mutex_lock_iothread(); - if (s->state != MIG_STATE_ACTIVE) { - DPRINTF("put_ready returning because of non-active state\n"); - qemu_mutex_unlock_iothread(); - break; - } - if (s->complete) { - qemu_mutex_unlock_iothread(); - break; - } if (s->bytes_xfer < s->xfer_limit) { DPRINTF("iterate\n"); pending_size = qemu_savevm_state_pending(s->file, max_size); DPRINTF("pending size %lu max %lu\n", pending_size, max_size); if (pending_size && pending_size >= max_size) { - ret = qemu_savevm_state_iterate(s->file); - if (ret < 0) { - qemu_mutex_unlock_iothread(); - break; - } + qemu_savevm_state_iterate(s->file); } else { int old_vm_running = runstate_is_running(); int64_t start_time, end_time; @@ -695,13 +682,8 @@ static void *buffered_file_thread(void *opaque) start_time = qemu_get_clock_ms(rt_clock); qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); - ret = qemu_savevm_state_complete(s->file); - if (ret < 0) { - qemu_mutex_unlock_iothread(); - break; - } else { - migrate_fd_completed(s); - } + qemu_savevm_state_complete(s->file); + migrate_fd_completed(s); end_time = qemu_get_clock_ms(rt_clock); s->total_time = end_time - s->total_time; s->downtime = end_time - start_time; @@ -740,12 +722,13 @@ static void *buffered_file_thread(void *opaque) sleep_time += qemu_get_clock_ms(rt_clock) - current_time; } buffered_flush(s); - ret = qemu_file_get_error(s->file); + qemu_mutex_lock_iothread(); + if (qemu_file_get_error(s->file)) { + migrate_fd_error(s); + } } - if (ret < 0) { - migrate_fd_error(s); - } + qemu_mutex_unlock_iothread(); g_free(s->buffer); return NULL; } @@ -770,7 +753,6 @@ void migrate_fd_connect(MigrationState *s) s->expected_downtime = max_downtime/1000000; s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO; - s->complete = false; s->file = qemu_fopen_ops(s, &buffered_file_ops); -- cgit v1.2.3