From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45310) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cioWs-0006HP-Og for qemu-devel@nongnu.org; Tue, 28 Feb 2017 15:37:51 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cioWr-0007wi-LX for qemu-devel@nongnu.org; Tue, 28 Feb 2017 15:37:50 -0500 From: Kevin Wolf Date: Tue, 28 Feb 2017 21:36:27 +0100 Message-Id: <1488314205-16264-29-git-send-email-kwolf@redhat.com> In-Reply-To: <1488314205-16264-1-git-send-email-kwolf@redhat.com> References: <1488314205-16264-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 28/46] commit: Use real permissions for HMP 'commit' List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org This is a little simpler than the commit block job because it's synchronous and only commits into the immediate backing file, but otherwise doing more or less the same. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz Acked-by: Fam Zheng --- block/commit.c | 33 +++++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/block/commit.c b/block/commit.c index 8de4473..f18026b 100644 --- a/block/commit.c +++ b/block/commit.c @@ -401,11 +401,14 @@ fail: int bdrv_commit(BlockDriverState *bs) { BlockBackend *src, *backing; + BlockDriverState *backing_file_bs = NULL; + BlockDriverState *commit_top_bs = NULL; BlockDriver *drv = bs->drv; int64_t sector, total_sectors, length, backing_length; int n, ro, open_flags; int ret = 0; uint8_t *buf = NULL; + Error *local_err = NULL; if (!drv) return -ENOMEDIUM; @@ -428,17 +431,31 @@ int bdrv_commit(BlockDriverState *bs) } } - /* FIXME Use real permissions */ - src = blk_new(0, BLK_PERM_ALL); - backing = blk_new(0, BLK_PERM_ALL); + src = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL); + backing = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); - ret = blk_insert_bs(src, bs, NULL); + ret = blk_insert_bs(src, bs, &local_err); if (ret < 0) { + error_report_err(local_err); + goto ro_cleanup; + } + + /* Insert commit_top block node above backing, so we can write to it */ + backing_file_bs = backing_bs(bs); + + commit_top_bs = bdrv_new_open_driver(&bdrv_commit_top, NULL, BDRV_O_RDWR, + &local_err); + if (commit_top_bs == NULL) { + error_report_err(local_err); goto ro_cleanup; } - ret = blk_insert_bs(backing, bs->backing->bs, NULL); + bdrv_set_backing_hd(commit_top_bs, backing_file_bs); + bdrv_set_backing_hd(bs, commit_top_bs); + + ret = blk_insert_bs(backing, backing_file_bs, &local_err); if (ret < 0) { + error_report_err(local_err); goto ro_cleanup; } @@ -512,8 +529,12 @@ int bdrv_commit(BlockDriverState *bs) ro_cleanup: qemu_vfree(buf); - blk_unref(src); blk_unref(backing); + if (backing_file_bs) { + bdrv_set_backing_hd(bs, backing_file_bs); + } + bdrv_unref(commit_top_bs); + blk_unref(src); if (ro) { /* ignoring error return here */ -- 1.8.3.1