move pause to only exist on Scheduler

src/context.rs

@@ -24,7 +24,7 @@ use crate::key::{DcKey, SignedPublicKey};
 use crate::login_param::LoginParam;
 use crate::message::{self, MessageState, MsgId};
 use crate::quota::QuotaInfo;
-use crate::scheduler::{IoPausedGuard, SchedulerState};
+use crate::scheduler::SchedulerState;
 use crate::sql::Sql;
 use crate::stock_str::StockStrings;
 use crate::timesmearing::SmearedTimestamp;
@@ -409,16 +409,6 @@ impl Context {
         self.scheduler.restart(self).await;
     }
 
-    /// Pauses the IO scheduler.
-    ///
-    /// This temporarily pauses the IO scheduler and will make sure calls to
-    /// [`Context::start_io`] are no-ops while being paused.
-    ///
-    /// It is recommended to call [`IoPausedGuard::resume`] rather than simply dropping it.
-    pub(crate) async fn pause_io(&self) -> IoPausedGuard<'_> {
-        self.scheduler.pause(self).await
-    }
-
     /// Indicate that the network likely has come back.
     pub async fn maybe_network(&self) {
         self.scheduler.maybe_network().await;

src/imex.rs

@@ -87,7 +87,7 @@ pub async fn imex(
     let cancel = context.alloc_ongoing().await?;
 
     let res = {
-        let mut guard = context.pause_io().await;
+        let mut guard = context.scheduler.pause(context).await;
         let res = imex_inner(context, what, path, passphrase)
             .race(async {
                 cancel.recv().await.ok();

src/scheduler.rs

@@ -87,12 +87,14 @@ impl SchedulerState {
         }
     }
 
-    /// Pauses the scheduler.
+    /// Pauses the IO scheduler.
     ///
     /// If it is currently running the scheduler will be stopped.  When
-    /// [`IoPausedGuard::resume`] is called the scheduler is started again.  If in the
-    /// meantime [`SchedulerState::start`] or [`SchedulerState::stop`] is called resume will
-    /// do the right thing.
+    /// [`IoPausedGuard::resume`] is called the scheduler is started again.
+    ///
+    /// If in the meantime [`SchedulerState::start`] or [`SchedulerState::stop`] is called
+    /// resume will do the right thing and restore the scheduler to the state requested by
+    /// the last call.
     pub(crate) async fn pause<'a>(&'_ self, context: &'a Context) -> IoPausedGuard<'a> {
         let mut inner = self.inner.write().await;
         inner.paused = true;