From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42509) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d8pIb-0001sP-Dc for qemu-devel@nongnu.org; Thu, 11 May 2017 10:42:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d8pIY-0004M0-14 for qemu-devel@nongnu.org; Thu, 11 May 2017 10:42:37 -0400 From: Paolo Bonzini Date: Thu, 11 May 2017 16:42:02 +0200 Message-Id: <20170511144208.24075-13-pbonzini@redhat.com> In-Reply-To: <20170511144208.24075-1-pbonzini@redhat.com> References: <20170511144208.24075-1-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 12/18] block: access write_gen with atomics List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: famz@redhat.com, stefanha@redhat.com, qemu-block@nongnu.org Reviewed-by: Stefan Hajnoczi Signed-off-by: Paolo Bonzini --- block.c | 2 +- block/io.c | 6 +++--- include/block/block_int.h | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/block.c b/block.c index 3a8e2e0ba4..98f48fe7f8 100644 --- a/block.c +++ b/block.c @@ -3333,7 +3333,7 @@ int bdrv_truncate(BdrvChild *child, int64_t offset) ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); bdrv_dirty_bitmap_truncate(bs); bdrv_parent_cb_resize(bs); - ++bs->write_gen; + atomic_inc(&bs->write_gen); } return ret; } diff --git a/block/io.c b/block/io.c index 25a00d82ed..06ad9f3a80 100644 --- a/block/io.c +++ b/block/io.c @@ -1410,7 +1410,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child, } bdrv_debug_event(bs, BLKDBG_PWRITEV_DONE); - ++bs->write_gen; + atomic_inc(&bs->write_gen); bdrv_set_dirty(bs, start_sector, end_sector - start_sector); stat64_max(&bs->wr_highest_offset, offset + bytes); @@ -2299,7 +2299,7 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) goto early_exit; } - current_gen = bs->write_gen; + current_gen = atomic_read(&bs->write_gen); /* Wait until any previous flushes are completed */ while (bs->active_flush_req) { @@ -2524,7 +2524,7 @@ int coroutine_fn bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, } ret = 0; out: - ++bs->write_gen; + atomic_inc(&bs->write_gen); bdrv_set_dirty(bs, req.offset >> BDRV_SECTOR_BITS, req.bytes >> BDRV_SECTOR_BITS); tracked_request_end(&req); diff --git a/include/block/block_int.h b/include/block/block_int.h index a9a1b45302..d24efe5ef8 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -598,7 +598,6 @@ struct BlockDriverState { QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; CoQueue flush_queue; /* Serializing flush queue */ bool active_flush_req; /* Flush request in flight? */ - unsigned int write_gen; /* Current data generation */ unsigned int flushed_gen; /* Flushed write generation */ QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; @@ -633,6 +632,7 @@ struct BlockDriverState { /* Accessed with atomic ops. */ int quiesce_counter; + unsigned int write_gen; /* Current data generation */ }; struct BlockBackendRootState { -- 2.12.2