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Snapshot creation races with region replacement (#6213)
Prevent the snapshot creation saga from racing with the region replacement saga by having the snapshot creation saga create a volume repair record, locking the volume for the duration of the snapshot creation. There's a large comment in the new `ssc_take_volume_lock` talking about the implications of these two sagas racing.
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// This Source Code Form is subject to the terms of the Mozilla Public | ||
// License, v. 2.0. If a copy of the MPL was not distributed with this | ||
// file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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//! [`DataStore`] methods on [`VolumeRepair`]s. | ||
use super::DataStore; | ||
use crate::db; | ||
use crate::db::datastore::OpContext; | ||
use crate::db::datastore::RunnableQuery; | ||
use crate::db::error::public_error_from_diesel; | ||
use crate::db::error::ErrorHandler; | ||
use crate::db::model::VolumeRepair; | ||
use async_bb8_diesel::AsyncRunQueryDsl; | ||
use diesel::prelude::*; | ||
use diesel::result::Error as DieselError; | ||
use omicron_common::api::external::Error; | ||
use uuid::Uuid; | ||
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impl DataStore { | ||
pub(super) fn volume_repair_insert_query( | ||
volume_id: Uuid, | ||
repair_id: Uuid, | ||
) -> impl RunnableQuery<VolumeRepair> { | ||
use db::schema::volume_repair::dsl; | ||
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diesel::insert_into(dsl::volume_repair) | ||
.values(VolumeRepair { volume_id, repair_id }) | ||
} | ||
|
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pub async fn volume_repair_lock( | ||
&self, | ||
opctx: &OpContext, | ||
volume_id: Uuid, | ||
repair_id: Uuid, | ||
) -> Result<(), Error> { | ||
let conn = self.pool_connection_authorized(opctx).await?; | ||
Self::volume_repair_insert_query(volume_id, repair_id) | ||
.execute_async(&*conn) | ||
.await | ||
.map(|_| ()) | ||
.map_err(|e| public_error_from_diesel(e, ErrorHandler::Server)) | ||
} | ||
|
||
pub(super) fn volume_repair_delete_query( | ||
volume_id: Uuid, | ||
repair_id: Uuid, | ||
) -> impl RunnableQuery<VolumeRepair> { | ||
use db::schema::volume_repair::dsl; | ||
|
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diesel::delete( | ||
dsl::volume_repair | ||
.filter(dsl::volume_id.eq(volume_id)) | ||
.filter(dsl::repair_id.eq(repair_id)), | ||
) | ||
} | ||
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pub async fn volume_repair_unlock( | ||
&self, | ||
opctx: &OpContext, | ||
volume_id: Uuid, | ||
repair_id: Uuid, | ||
) -> Result<(), Error> { | ||
let conn = self.pool_connection_authorized(opctx).await?; | ||
Self::volume_repair_delete_query(volume_id, repair_id) | ||
.execute_async(&*conn) | ||
.await | ||
.map(|_| ()) | ||
.map_err(|e| public_error_from_diesel(e, ErrorHandler::Server)) | ||
} | ||
|
||
pub async fn volume_repair_get( | ||
conn: &async_bb8_diesel::Connection<db::DbConnection>, | ||
volume_id: Uuid, | ||
repair_id: Uuid, | ||
) -> Result<VolumeRepair, DieselError> { | ||
use db::schema::volume_repair::dsl; | ||
|
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dsl::volume_repair | ||
.filter(dsl::repair_id.eq(repair_id)) | ||
.filter(dsl::volume_id.eq(volume_id)) | ||
.first_async::<VolumeRepair>(conn) | ||
.await | ||
} | ||
} |
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