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blockdev: drain while unlocked in internal_snapshot_action()

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This is in preparation to mark bdrv_drained_begin() as GRAPH_UNLOCKED.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20250530151125.955508-18-f.ebner@proxmox.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fiona Ebner 2025-05-30 17:10:54 +02:00 • committed by Kevin Wolf
parent d75f8ed1d7
commit 6f101614f9
1 changed files with 17 additions and 2 deletions
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19
blockdev.c
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@ -1208,7 +1208,7 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
Error *local_err = NULL;
const char *device;
const char *name;
BlockDriverState *bs;
BlockDriverState *bs, *check_bs;
QEMUSnapshotInfo old_sn, *sn;
bool ret;
int64_t rt;
@ -1216,7 +1216,7 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
int ret1;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
bdrv_graph_rdlock_main_loop();
tran_add(tran, &internal_snapshot_drv, state);
@ -1225,14 +1225,29 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
bs = qmp_get_root_bs(device, errp);
if (!bs) {
bdrv_graph_rdunlock_main_loop();
return;
}
state->bs = bs;
/* Need to drain while unlocked. */
bdrv_graph_rdunlock_main_loop();
/* Paired with .clean() */
bdrv_drained_begin(bs);
GRAPH_RDLOCK_GUARD_MAINLOOP();
/* Make sure the root bs did not change with the drain. */
check_bs = qmp_get_root_bs(device, errp);
if (bs != check_bs) {
if (check_bs) {
error_setg(errp, "Block node of device '%s' unexpectedly changed",
device);
} /* else errp is already set */
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
return;
}