From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53955) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aBamv-00030p-AB for qemu-devel@nongnu.org; Tue, 22 Dec 2015 23:12:34 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aBamu-0003Mv-CK for qemu-devel@nongnu.org; Tue, 22 Dec 2015 23:12:33 -0500 From: Fam Zheng Date: Wed, 23 Dec 2015 12:12:08 +0800 Message-Id: <1450843928-15380-3-git-send-email-famz@redhat.com> In-Reply-To: <1450843928-15380-1-git-send-email-famz@redhat.com> References: <1450843928-15380-1-git-send-email-famz@redhat.com> Subject: [Qemu-devel] [PATCH v7 2/2] mirror: Add mirror_wait_for_io List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , pbonzini@redhat.com, Jeff Cody , qemu-block@nongnu.org, mreitz@redhat.com The three lines are duplicated a number of times now, refactor a function. Signed-off-by: Fam Zheng Reviewed-by: Max Reitz --- block/mirror.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index 90a4ebc..fffcfe0 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -191,6 +191,14 @@ static int mirror_cow_align(MirrorBlockJob *s, return diff; } +static inline void mirror_wait_for_io(MirrorBlockJob *s) +{ + assert(!s->waiting_for_io); + s->waiting_for_io = true; + qemu_coroutine_yield(); + s->waiting_for_io = false; +} + /* Submit async read while handling COW. * Returns: nb_sectors if no alignment is necessary, or * (new_end - sector_num) if tail is rounded up or down due to @@ -223,9 +231,7 @@ static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, while (s->buf_free_count < nb_chunks) { trace_mirror_yield_in_flight(s, sector_num, s->in_flight); - s->waiting_for_io = true; - qemu_coroutine_yield(); - s->waiting_for_io = false; + mirror_wait_for_io(s); } /* Allocate a MirrorOp that is used as an AIO callback. */ @@ -316,9 +322,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) break; } trace_mirror_yield_in_flight(s, next_sector, s->in_flight); - s->waiting_for_io = true; - qemu_coroutine_yield(); - s->waiting_for_io = false; + mirror_wait_for_io(s); /* Now retry. */ } else { hbitmap_next = hbitmap_iter_next(&s->hbi); @@ -408,9 +412,7 @@ static void mirror_free_init(MirrorBlockJob *s) static void mirror_drain(MirrorBlockJob *s) { while (s->in_flight > 0) { - s->waiting_for_io = true; - qemu_coroutine_yield(); - s->waiting_for_io = false; + mirror_wait_for_io(s); } } @@ -597,9 +599,7 @@ static void coroutine_fn mirror_run(void *opaque) if (s->in_flight == MAX_IN_FLIGHT || s->buf_free_count == 0 || (cnt == 0 && s->in_flight > 0)) { trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); - s->waiting_for_io = true; - qemu_coroutine_yield(); - s->waiting_for_io = false; + mirror_wait_for_io(s); continue; } else if (cnt != 0) { delay_ns = mirror_iteration(s); -- 2.4.3