diff options
| -rw-r--r-- | block/iscsi.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index d37c4ee171..db41bb7582 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -39,6 +39,7 @@ typedef struct IscsiLun { int lun; int block_size; unsigned long num_blocks; + int events; } IscsiLun; typedef struct IscsiAIOCB { @@ -104,11 +105,27 @@ static void iscsi_set_events(IscsiLun *iscsilun) { struct iscsi_context *iscsi = iscsilun->iscsi; + int ev; - qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), iscsi_process_read, - (iscsi_which_events(iscsi) & POLLOUT) - ? iscsi_process_write : NULL, - iscsi_process_flush, iscsilun); + /* We always register a read handler. */ + ev = POLLIN; + ev |= iscsi_which_events(iscsi); + if (ev != iscsilun->events) { + qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), + iscsi_process_read, + (ev & POLLOUT) ? iscsi_process_write : NULL, + iscsi_process_flush, + iscsilun); + + } + + /* If we just added an event, the callback might be delayed + * unless we call qemu_notify_event(). + */ + if (ev & ~iscsilun->events) { + qemu_notify_event(); + } + iscsilun->events = ev; } static void |