diff --git a/core/mvcc/database/checkpoint_state_machine.rs b/core/mvcc/database/checkpoint_state_machine.rs
index 23fc97eaf..d2f5e5897 100644
--- a/core/mvcc/database/checkpoint_state_machine.rs
+++ b/core/mvcc/database/checkpoint_state_machine.rs
@@ -7,9 +7,10 @@ use crate::state_machine::{StateMachine, StateTransition, TransitionResult};
 use crate::storage::btree::BTreeCursor;
 use crate::storage::pager::CreateBTreeFlags;
 use crate::storage::wal::{CheckpointMode, TursoRwLock};
-use crate::types::{IOResult, ImmutableRecord, RecordCursor};
+use crate::types::{IOCompletions, IOResult, ImmutableRecord, RecordCursor};
 use crate::{
-    CheckpointResult, Connection, IOExt, Pager, RefValue, Result, TransactionState, Value,
+    CheckpointResult, Completion, Connection, IOExt, Pager, RefValue, Result, TransactionState,
+    Value,
 };
 use parking_lot::RwLock;
 use std::collections::{HashMap, HashSet};
@@ -271,12 +272,12 @@ impl<Clock: LogicalClock> CheckpointStateMachine<Clock> {
     }
 
     /// Fsync the logical log file
-    fn fsync_logical_log(&self) -> Result<IOResult<()>> {
+    fn fsync_logical_log(&self) -> Result<Completion> {
         self.mvstore.storage.sync()
     }
 
     /// Truncate the logical log file
-    fn truncate_logical_log(&self) -> Result<IOResult<()>> {
+    fn truncate_logical_log(&self) -> Result<Completion> {
         self.mvstore.storage.truncate()
     }
 
@@ -572,30 +573,25 @@ impl<Clock: LogicalClock> CheckpointStateMachine<Clock> {
 
             CheckpointState::TruncateLogicalLog => {
                 tracing::debug!("Truncating logical log file");
-                match self.truncate_logical_log()? {
-                    IOResult::Done(_) => {
-                        self.state = CheckpointState::FsyncLogicalLog;
-                        Ok(TransitionResult::Continue)
-                    }
-                    IOResult::IO(io) => {
-                        if io.finished() {
-                            self.state = CheckpointState::CheckpointWal;
-                            Ok(TransitionResult::Continue)
-                        } else {
-                            Ok(TransitionResult::Io(io))
-                        }
-                    }
+                let c = self.truncate_logical_log()?;
+                self.state = CheckpointState::FsyncLogicalLog;
+                // if Completion Completed without errors we can continue
+                if c.is_completed() {
+                    Ok(TransitionResult::Continue)
+                } else {
+                    Ok(TransitionResult::Io(IOCompletions::Single(c)))
                 }
             }
 
             CheckpointState::FsyncLogicalLog => {
                 tracing::debug!("Fsyncing logical log file");
-                match self.fsync_logical_log()? {
-                    IOResult::Done(_) => {
-                        self.state = CheckpointState::CheckpointWal;
-                        Ok(TransitionResult::Continue)
-                    }
-                    IOResult::IO(io) => Ok(TransitionResult::Io(io)),
+                let c = self.fsync_logical_log()?;
+                self.state = CheckpointState::CheckpointWal;
+                // if Completion Completed without errors we can continue
+                if c.is_completed() {
+                    Ok(TransitionResult::Continue)
+                } else {
+                    Ok(TransitionResult::Io(IOCompletions::Single(c)))
                 }
             }
 
diff --git a/core/mvcc/database/mod.rs b/core/mvcc/database/mod.rs
index 486cfb923..e9794289d 100644
--- a/core/mvcc/database/mod.rs
+++ b/core/mvcc/database/mod.rs
@@ -611,27 +611,24 @@ impl<Clock: LogicalClock> StateTransition for CommitStateMachine<Clock> {
                         )));
                     }
                 }
-                let result = mvcc_store.storage.log_tx(log_record)?;
+                let c = mvcc_store.storage.log_tx(log_record)?;
                 self.state = CommitState::SyncLogicalLog { end_ts: *end_ts };
-                match result {
-                    IOResult::Done(_) => {}
-                    IOResult::IO(io) => {
-                        if !io.finished() {
-                            return Ok(TransitionResult::Io(io));
-                        }
-                    }
+                // if Completion Completed without errors we can continue
+                if c.is_completed() {
+                    Ok(TransitionResult::Continue)
+                } else {
+                    Ok(TransitionResult::Io(IOCompletions::Single(c)))
                 }
-                return Ok(TransitionResult::Continue);
             }
             CommitState::SyncLogicalLog { end_ts } => {
-                let result = mvcc_store.storage.sync()?;
+                let c = mvcc_store.storage.sync()?;
                 self.state = CommitState::EndCommitLogicalLog { end_ts: *end_ts };
-                if let IOResult::IO(io) = result {
-                    if !io.finished() {
-                        return Ok(TransitionResult::Io(io));
-                    }
+                // if Completion Completed without errors we can continue
+                if c.is_completed() {
+                    Ok(TransitionResult::Continue)
+                } else {
+                    Ok(TransitionResult::Io(IOCompletions::Single(c)))
                 }
-                return Ok(TransitionResult::Continue);
             }
             CommitState::EndCommitLogicalLog { end_ts } => {
                 let connection = self.connection.clone();
diff --git a/core/mvcc/persistent_storage/logical_log.rs b/core/mvcc/persistent_storage/logical_log.rs
index bb522796e..591dd866f 100644
--- a/core/mvcc/persistent_storage/logical_log.rs
+++ b/core/mvcc/persistent_storage/logical_log.rs
@@ -5,12 +5,12 @@ use crate::{
     mvcc::database::{LogRecord, MVTableId, Row, RowID, RowVersion},
     storage::sqlite3_ondisk::{read_varint, write_varint_to_vec},
     turso_assert,
-    types::{IOCompletions, ImmutableRecord},
+    types::ImmutableRecord,
     Buffer, Completion, CompletionError, LimboError, Result,
 };
 use std::sync::{Arc, RwLock};
 
-use crate::{types::IOResult, File};
+use crate::File;
 
 pub struct LogicalLog {
     pub file: Arc<dyn File>,
@@ -143,7 +143,7 @@ impl LogicalLog {
         Self { file, offset: 0 }
     }
 
-    pub fn log_tx(&mut self, tx: &LogRecord) -> Result<IOResult<()>> {
+    pub fn log_tx(&mut self, tx: &LogRecord) -> Result<Completion> {
         let mut buffer = Vec::new();
 
         // 1. Serialize log header if it's first write
@@ -194,18 +194,18 @@ impl LogicalLog {
         let buffer_len = buffer.len();
         let c = self.file.pwrite(self.offset, buffer, c)?;
         self.offset += buffer_len as u64;
-        Ok(IOResult::IO(IOCompletions::Single(c)))
+        Ok(c)
     }
 
-    pub fn sync(&mut self) -> Result<IOResult<()>> {
+    pub fn sync(&mut self) -> Result<Completion> {
         let completion = Completion::new_sync(move |_| {
             tracing::debug!("logical_log_sync finish");
         });
         let c = self.file.sync(completion)?;
-        Ok(IOResult::IO(IOCompletions::Single(c)))
+        Ok(c)
     }
 
-    pub fn truncate(&mut self) -> Result<IOResult<()>> {
+    pub fn truncate(&mut self) -> Result<Completion> {
         let completion = Completion::new_trunc(move |result| {
             if let Err(err) = result {
                 tracing::error!("logical_log_truncate failed: {}", err);
@@ -213,7 +213,7 @@ impl LogicalLog {
         });
         let c = self.file.truncate(0, completion)?;
         self.offset = 0;
-        Ok(IOResult::IO(IOCompletions::Single(c)))
+        Ok(c)
     }
 }
 
diff --git a/core/mvcc/persistent_storage/mod.rs b/core/mvcc/persistent_storage/mod.rs
index 063eab90a..cafcb3230 100644
--- a/core/mvcc/persistent_storage/mod.rs
+++ b/core/mvcc/persistent_storage/mod.rs
@@ -4,8 +4,7 @@ use std::sync::{Arc, RwLock};
 pub mod logical_log;
 use crate::mvcc::database::LogRecord;
 use crate::mvcc::persistent_storage::logical_log::LogicalLog;
-use crate::types::IOResult;
-use crate::{File, Result};
+use crate::{Completion, File, Result};
 
 pub struct Storage {
     pub logical_log: RwLock<LogicalLog>,
@@ -20,7 +19,7 @@ impl Storage {
 }
 
 impl Storage {
-    pub fn log_tx(&self, m: &LogRecord) -> Result<IOResult<()>> {
+    pub fn log_tx(&self, m: &LogRecord) -> Result<Completion> {
         self.logical_log.write().unwrap().log_tx(m)
     }
 
@@ -28,11 +27,11 @@ impl Storage {
         todo!()
     }
 
-    pub fn sync(&self) -> Result<IOResult<()>> {
+    pub fn sync(&self) -> Result<Completion> {
         self.logical_log.write().unwrap().sync()
     }
 
-    pub fn truncate(&self) -> Result<IOResult<()>> {
+    pub fn truncate(&self) -> Result<Completion> {
         self.logical_log.write().unwrap().truncate()
     }