diff options
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/aio.h | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/include/block/aio.h b/include/block/aio.h index 9dd61cee7e..90e07d7507 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -52,6 +52,38 @@ struct ThreadPool; struct LinuxAioState; struct LuringState; +/* Callbacks for file descriptor monitoring implementations */ +typedef struct { + /* + * update: + * @ctx: the AioContext + * @node: the handler + * @is_new: is the file descriptor already being monitored? + * + * Add/remove/modify a monitored file descriptor. There are three cases: + * 1. node->pfd.events == 0 means remove the file descriptor. + * 2. !is_new means modify an already monitored file descriptor. + * 3. is_new means add a new file descriptor. + * + * Called with ctx->list_lock acquired. + */ + void (*update)(AioContext *ctx, AioHandler *node, bool is_new); + + /* + * wait: + * @ctx: the AioContext + * @ready_list: list for handlers that become ready + * @timeout: maximum duration to wait, in nanoseconds + * + * Wait for file descriptors to become ready and place them on ready_list. + * + * Called with ctx->list_lock incremented but not locked. + * + * Returns: number of ready file descriptors. + */ + int (*wait)(AioContext *ctx, AioHandlerList *ready_list, int64_t timeout); +} FDMonOps; + /* * Each aio_bh_poll() call carves off a slice of the BH list, so that newly * scheduled BHs are not processed until the next aio_bh_poll() call. All @@ -173,8 +205,8 @@ struct AioContext { /* epoll(7) state used when built with CONFIG_EPOLL */ int epollfd; - bool epoll_enabled; - bool epoll_available; + + const FDMonOps *fdmon_ops; }; /** |