From: Max Reitz <mreitz@redhat.com> To: qemu-block@nongnu.org Cc: Kevin Wolf <kwolf@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>, qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com> Subject: [Qemu-devel] [PATCH v6 33/42] blockdev: Fix active commit choice Date: Fri, 9 Aug 2019 18:13:58 +0200 Message-ID: <20190809161407.11920-34-mreitz@redhat.com> (raw) In-Reply-To: <20190809161407.11920-1-mreitz@redhat.com> We have to perform an active commit whenever the top node has a parent that has taken the WRITE permission on it. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> --- blockdev.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/blockdev.c b/blockdev.c index ee8b951154..4e72f6f701 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3356,6 +3356,7 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, */ BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; int job_flags = JOB_DEFAULT; + uint64_t top_perm, top_shared; if (!has_speed) { speed = 0; @@ -3468,14 +3469,31 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, goto out; } - if (top_bs == bs) { + /* + * Active commit is required if and only if someone has taken a + * WRITE permission on the top node. Historically, we have always + * used active commit for top nodes, so continue that practice. + * (Active commit is never really wrong.) + */ + bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); + if (top_perm & BLK_PERM_WRITE || + bdrv_skip_rw_filters(top_bs) == bdrv_skip_rw_filters(bs)) + { if (has_backing_file) { error_setg(errp, "'backing-file' specified," " but 'top' is the active layer"); goto out; } - commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, - job_flags, speed, on_error, + if (!has_job_id) { + /* + * Emulate here what block_job_create() does, because it + * is possible that @bs != @top_bs (the block job should + * be named after @bs, even if @top_bs is the actual + * source) + */ + job_id = bdrv_get_device_name(bs); + } + commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, filter_node_name, NULL, NULL, false, &local_err); } else { BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); -- 2.21.0
next prev parent reply index Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-09 16:13 [Qemu-devel] [PATCH v6 00/42] block: Deal with filters Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 01/42] block: Mark commit and mirror as filter drivers Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 02/42] copy-on-read: Support compressed writes Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 03/42] throttle: " Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 04/42] block: Add child access functions Max Reitz 2019-08-09 16:56 ` Eric Blake 2019-09-04 16:16 ` Kevin Wolf 2019-09-09 7:56 ` Max Reitz 2019-09-09 9:36 ` Kevin Wolf 2019-09-09 14:04 ` Max Reitz 2019-09-09 16:13 ` Kevin Wolf 2019-09-10 9:14 ` Max Reitz 2019-09-10 10:47 ` Kevin Wolf 2019-09-10 11:36 ` Max Reitz 2019-09-10 12:48 ` Kevin Wolf 2019-09-10 12:59 ` Max Reitz 2019-09-10 13:10 ` Kevin Wolf 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 05/42] block: Add chain helper functions Max Reitz 2019-08-09 17:01 ` Eric Blake 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 06/42] qcow2: Implement .bdrv_storage_child() Max Reitz 2019-08-09 17:07 ` Eric Blake 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 07/42] block: *filtered_cow_child() for *has_zero_init() Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 08/42] block: bdrv_set_backing_hd() is about bs->backing Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 09/42] block: Include filters when freezing backing chain Max Reitz 2019-08-10 13:32 ` Vladimir Sementsov-Ogievskiy 2019-08-12 12:56 ` Max Reitz 2019-09-05 13:05 ` Kevin Wolf 2019-09-09 8:02 ` Max Reitz 2019-09-09 9:40 ` Kevin Wolf 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 10/42] block: Drop bdrv_is_encrypted() Max Reitz 2019-08-10 13:42 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 11/42] block: Add bdrv_supports_compressed_writes() Max Reitz 2019-09-05 13:11 ` Kevin Wolf 2019-09-09 8:09 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 12/42] block: Use bdrv_filtered_rw* where obvious Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 13/42] block: Use CAFs in block status functions Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 14/42] block: Use CAFs when working with backing chains Max Reitz 2019-08-10 15:19 ` Vladimir Sementsov-Ogievskiy 2019-09-05 14:05 ` Kevin Wolf 2019-09-09 8:25 ` Max Reitz 2019-09-09 9:55 ` Kevin Wolf 2019-09-09 14:08 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 15/42] block: Re-evaluate backing file handling in reopen Max Reitz 2019-08-10 16:05 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 16/42] block: Flush all children in generic code Max Reitz 2019-08-10 15:36 ` Vladimir Sementsov-Ogievskiy 2019-08-12 12:58 ` Max Reitz 2019-09-05 16:24 ` Kevin Wolf 2019-09-09 8:31 ` Max Reitz 2019-09-09 10:01 ` Kevin Wolf 2019-09-09 14:15 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 17/42] block: Use CAFs in bdrv_refresh_limits() Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 18/42] block: Use CAFs in bdrv_refresh_filename() Max Reitz 2019-08-10 16:22 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 19/42] block: Use CAF in bdrv_co_rw_vmstate() Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 20/42] block/snapshot: Fix fallback Max Reitz 2019-08-10 16:34 ` Vladimir Sementsov-Ogievskiy 2019-08-12 13:06 ` Max Reitz 2019-09-10 11:56 ` Kevin Wolf 2019-09-10 12:04 ` Max Reitz 2019-09-10 12:49 ` Kevin Wolf 2019-09-10 13:06 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 21/42] block: Use CAFs for debug breakpoints Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 22/42] block: Fix bdrv_get_allocated_file_size's fallback Max Reitz 2019-08-10 16:41 ` Vladimir Sementsov-Ogievskiy 2019-08-12 13:09 ` Max Reitz 2019-08-12 17:14 ` Vladimir Sementsov-Ogievskiy 2019-08-12 19:15 ` Max Reitz 2019-09-10 14:52 ` Kevin Wolf 2019-09-11 6:20 ` Max Reitz 2019-09-11 6:55 ` Kevin Wolf 2019-09-11 7:37 ` Max Reitz 2019-09-11 8:27 ` Kevin Wolf 2019-09-11 10:00 ` Max Reitz 2019-09-11 10:31 ` Kevin Wolf 2019-09-11 11:00 ` Max Reitz 2019-09-12 10:34 ` Kevin Wolf 2019-11-14 13:11 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 23/42] blockdev: Use CAF in external_snapshot_prepare() Max Reitz 2019-09-10 15:02 ` Kevin Wolf 2019-09-11 6:21 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 24/42] block: Use child access functions for QAPI queries Max Reitz 2019-08-10 16:57 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 25/42] mirror: Deal with filters Max Reitz 2019-08-12 11:09 ` Vladimir Sementsov-Ogievskiy 2019-08-12 13:26 ` Max Reitz 2019-08-14 15:17 ` Vladimir Sementsov-Ogievskiy 2019-08-31 9:57 ` Vladimir Sementsov-Ogievskiy 2019-09-02 14:35 ` Max Reitz 2019-09-03 8:32 ` Vladimir Sementsov-Ogievskiy 2019-09-09 7:41 ` Max Reitz 2019-09-13 12:55 ` Kevin Wolf 2019-09-16 10:26 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 26/42] backup: " Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 27/42] commit: " Max Reitz 2019-08-31 10:44 ` Vladimir Sementsov-Ogievskiy 2019-09-02 14:55 ` Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 28/42] stream: " Max Reitz 2019-08-12 11:55 ` Vladimir Sementsov-Ogievskiy 2019-09-13 14:16 ` Kevin Wolf 2019-09-16 9:52 ` Max Reitz 2019-09-16 14:47 ` Kevin Wolf 2019-12-11 12:52 ` Max Reitz 2019-12-11 15:52 ` Kevin Wolf 2019-12-11 16:12 ` Max Reitz 2019-12-11 16:35 ` Kevin Wolf 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 29/42] nbd: Use CAF when looking for dirty bitmap Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 30/42] qemu-img: Use child access functions Max Reitz 2019-08-12 12:14 ` Vladimir Sementsov-Ogievskiy 2019-08-12 13:28 ` Max Reitz 2019-08-14 16:04 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 31/42] block: Drop backing_bs() Max Reitz 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 32/42] block: Make bdrv_get_cumulative_perm() public Max Reitz 2019-08-09 16:13 ` Max Reitz [this message] 2019-08-09 16:13 ` [Qemu-devel] [PATCH v6 34/42] block: Inline bdrv_co_block_status_from_*() Max Reitz 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 35/42] block: Fix check_to_replace_node() Max Reitz 2019-08-15 15:21 ` Vladimir Sementsov-Ogievskiy 2019-08-15 17:01 ` Max Reitz 2019-08-16 11:01 ` Vladimir Sementsov-Ogievskiy 2019-08-16 13:30 ` Max Reitz 2019-08-16 14:24 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 36/42] iotests: Add tests for mirror @replaces loops Max Reitz 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 37/42] block: Leave BDS.backing_file constant Max Reitz 2019-08-16 16:16 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 38/42] iotests: Let complete_and_wait() work with commit Max Reitz 2019-08-23 5:59 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 39/42] iotests: Add filter commit test cases Max Reitz 2019-08-31 11:41 ` Vladimir Sementsov-Ogievskiy 2019-09-02 15:06 ` Max Reitz 2019-08-31 12:35 ` Vladimir Sementsov-Ogievskiy 2019-09-02 15:09 ` Max Reitz 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 40/42] iotests: Add filter mirror " Max Reitz 2019-08-31 12:35 ` Vladimir Sementsov-Ogievskiy 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 41/42] iotests: Add test for commit in sub directory Max Reitz 2019-08-09 16:14 ` [Qemu-devel] [PATCH v6 42/42] iotests: Test committing to overridden backing Max Reitz 2019-09-03 9:18 ` Vladimir Sementsov-Ogievskiy
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