From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60976) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZycFx-0007kV-B6 for qemu-devel@nongnu.org; Tue, 17 Nov 2015 04:08:54 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZycFt-0003oA-IB for qemu-devel@nongnu.org; Tue, 17 Nov 2015 04:08:53 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:11975 helo=relay.sw.ru) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZycFt-0003o4-53 for qemu-devel@nongnu.org; Tue, 17 Nov 2015 04:08:49 -0500 From: "Denis V. Lunev" Date: Tue, 17 Nov 2015 12:08:30 +0300 Message-Id: <1447751311-2317-11-git-send-email-den@openvz.org> In-Reply-To: <1447751311-2317-1-git-send-email-den@openvz.org> References: <1447751311-2317-1-git-send-email-den@openvz.org> Subject: [Qemu-devel] [PATCH 10/11] migration: implement bdrv_all_find_vmstate_bs helper List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , "Denis V. Lunev" , qemu-devel@nongnu.org, stefanha@redhat.com, Juan Quintela The patch also ensures proper locking for the operation. Signed-off-by: Denis V. Lunev Reviewed-by: Stefan Hajnoczi Reviewed-by: Fam Zheng CC: Juan Quintela CC: Kevin Wolf --- block/snapshot.c | 15 +++++++++++++++ include/block/snapshot.h | 2 ++ migration/savevm.c | 19 ++++--------------- 3 files changed, 21 insertions(+), 15 deletions(-) diff --git a/block/snapshot.c b/block/snapshot.c index 75d0b96..6e9fa8d 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -469,3 +469,18 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, *first_bad_bs = bs; return err; } + +BlockDriverState *bdrv_all_find_vmstate_bs(void) +{ + bool not_found = true; + BlockDriverState *bs = NULL; + + while (not_found && (bs = bdrv_next(bs))) { + AioContext *ctx = bdrv_get_aio_context(bs); + + aio_context_acquire(ctx); + not_found = !bdrv_can_snapshot(bs); + aio_context_release(ctx); + } + return bs; +} diff --git a/include/block/snapshot.h b/include/block/snapshot.h index 55e995a..c6910da6 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -91,4 +91,6 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, uint64_t vm_state_size, BlockDriverState **first_bad_bs); +BlockDriverState *bdrv_all_find_vmstate_bs(void); + #endif diff --git a/migration/savevm.c b/migration/savevm.c index 98f9a8c..a845e69 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1905,17 +1905,6 @@ int qemu_loadvm_state(QEMUFile *f) return ret; } -static BlockDriverState *find_vmstate_bs(void) -{ - BlockDriverState *bs = NULL; - while ((bs = bdrv_next(bs))) { - if (bdrv_can_snapshot(bs)) { - return bs; - } - } - return NULL; -} - void hmp_savevm(Monitor *mon, const QDict *qdict) { BlockDriverState *bs, *bs1; @@ -1944,8 +1933,8 @@ void hmp_savevm(Monitor *mon, const QDict *qdict) return; } - bs = find_vmstate_bs(); - if (!bs) { + bs = bdrv_all_find_vmstate_bs(); + if (bs == NULL) { monitor_printf(mon, "No block device can accept snapshots\n"); return; } @@ -2054,7 +2043,7 @@ int load_vmstate(const char *name) return ret; } - bs_vm_state = find_vmstate_bs(); + bs_vm_state = bdrv_all_find_vmstate_bs(); if (!bs_vm_state) { error_report("No block device supports snapshots"); return -ENOTSUP; @@ -2123,7 +2112,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict) int total; int *available_snapshots; - bs = find_vmstate_bs(); + bs = bdrv_all_find_vmstate_bs(); if (!bs) { monitor_printf(mon, "No available block device supports snapshots\n"); return; -- 2.5.0