2023-06-09 15:34:10 +00:00
33 changed files with 2057 additions and 877 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -2641,9 +2641,9 @@ dependencies = [

 [[package]]
 name = "proc-macro-hack"
-version = "0.5.19"
+version = "0.5.20+deprecated"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"

 [[package]]
 name = "proc-macro2"
--- a/Cargo.nix
+++ b/Cargo.nix
@ -32,7 +32,7 @@ args@{
  ignoreLockHash,
 }:
 let
-  nixifiedLockHash = "30497a698042332c229ed062aa3c4bc7d17c3e927deb3cf9d4dc12d8a0492515";
+  nixifiedLockHash = "5214dc0a8455fa16df874d9a8efdaa0b99cb3b6ae4cf2ea973137c1b8a1d39d6";
  workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
  currentLockHash = builtins.hashFile "sha256" (workspaceSrc + /Cargo.lock);
  lockHashIgnored = if ignoreLockHash
@ -1985,7 +1985,7 @@ in
    src = fetchCratesIo { inherit name version; sha256 = "f6b0decc02f4636b9ccad390dcbe77b722a77efedfa393caf8379a51d5c61899"; };
    dependencies = {
      git_version_macro = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".git-version-macro."0.3.5" { profileName = "__noProfile"; }).out;
-      proc_macro_hack = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.19" { profileName = "__noProfile"; }).out;
+      proc_macro_hack = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.20+deprecated" { profileName = "__noProfile"; }).out;
    };
  });
  
@ -1995,7 +1995,7 @@ in
    registry = "registry+https://github.com/rust-lang/crates.io-index";
    src = fetchCratesIo { inherit name version; sha256 = "fe69f1cbdb6e28af2bac214e943b99ce8a0a06b447d15d3e61161b0423139f3f"; };
    dependencies = {
-      proc_macro_hack = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.19" { profileName = "__noProfile"; }).out;
+      proc_macro_hack = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.20+deprecated" { profileName = "__noProfile"; }).out;
      proc_macro2 = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.56" { inherit profileName; }).out;
      quote = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.26" { inherit profileName; }).out;
      syn = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.94" { inherit profileName; }).out;
@ -3695,11 +3695,11 @@ in
    };
  });
  
-  "registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.19" = overridableMkRustCrate (profileName: rec {
+  "registry+https://github.com/rust-lang/crates.io-index".proc-macro-hack."0.5.20+deprecated" = overridableMkRustCrate (profileName: rec {
    name = "proc-macro-hack";
-    version = "0.5.19";
+    version = "0.5.20+deprecated";
    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"; };
+    src = fetchCratesIo { inherit name version; sha256 = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"; };
  });
  
  "registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.56" = overridableMkRustCrate (profileName: rec {
--- a/doc/drafts/admin-api.md
+++ b/doc/drafts/admin-api.md
@ -535,7 +535,10 @@ Example response:
        ],
        "objects": 14827,
        "bytes": 13189855625,
-        "unfinshedUploads": 0,
+        "unfinishedUploads": 1,
+        "unfinishedMultipartUploads": 1,
+        "unfinishedMultipartUploadParts": 11,
+        "unfinishedMultipartUploadBytes": 41943040,
        "quotas": {
            "maxSize": null,
            "maxObjects": null
--- a/script/test-renumbering.sh
+++ b/script/test-renumbering.sh
@ -0,0 +1,138 @@
+#!/usr/bin/env bash
+
+: '
+	This script tests part renumbering on an S3 remote (here configured for Minio).
+
+	On Minio:
+
+	The results confirm that if I upload parts with number 1, 4, 5 and 6,
+	they are renumbered to 1, 2, 3 and 4 after CompleteMultipartUpload.
+	Thus, specifying partNumber=4 on a GetObject/HeadObject should return
+	information on the part I originally uploaded with part number
+
+	On S3: not tested
+
+	Sample output (on Minio):
+
+		f07e1404cc527d494242824ded3a616b  part1
+		78974cd4d0f622eb3426ea7cd22f5a1c  part4
+		f9cc379f8baa61645558d9ba7e6351fa  part5
+		1bd2383eebbac1f8e7143575ba5b1f4a  part6
+		Upload ID: 6838b813-d0ca-400b-9d28-ec8b2b5cd004
+		PART 1 ETag: "f07e1404cc527d494242824ded3a616b"
+		PART 4 ETag: "78974cd4d0f622eb3426ea7cd22f5a1c"
+		PART 5 ETag: "f9cc379f8baa61645558d9ba7e6351fa"
+		PART 6 ETag: "1bd2383eebbac1f8e7143575ba5b1f4a"
+		======================================== LIST ====
+		{
+		  "Parts": [
+			{
+			  "PartNumber": 1,
+			  "LastModified": "2023-04-25T10:21:54.350000+00:00",
+			  "ETag": "\"f07e1404cc527d494242824ded3a616b\"",
+			  "Size": 20971520
+			},
+			{
+			  "PartNumber": 4,
+			  "LastModified": "2023-04-25T10:21:54.350000+00:00",
+			  "ETag": "\"78974cd4d0f622eb3426ea7cd22f5a1c\"",
+			  "Size": 20971520
+			},
+			{
+			  "PartNumber": 5,
+			  "LastModified": "2023-04-25T10:21:54.350000+00:00",
+			  "ETag": "\"f9cc379f8baa61645558d9ba7e6351fa\"",
+			  "Size": 20971520
+			},
+			{
+			  "PartNumber": 6,
+			  "LastModified": "2023-04-25T10:21:54.350000+00:00",
+			  "ETag": "\"1bd2383eebbac1f8e7143575ba5b1f4a\"",
+			  "Size": 20971520
+			}
+		  ],
+		  "ChecksumAlgorithm": "",
+		  "Initiator": {
+			"ID": "02d6176db174dc93cb1b899f7c6078f08654445fe8cf1b6ce98d8855f66bdbf4",
+			"DisplayName": "02d6176db174dc93cb1b899f7c6078f08654445fe8cf1b6ce98d8855f66bdbf4"
+		  },
+		  "Owner": {
+			"DisplayName": "02d6176db174dc93cb1b899f7c6078f08654445fe8cf1b6ce98d8855f66bdbf4",
+			"ID": "02d6176db174dc93cb1b899f7c6078f08654445fe8cf1b6ce98d8855f66bdbf4"
+		  },
+		  "StorageClass": "STANDARD"
+		}
+		======================================== COMPLETE ====
+		{
+			"Location": "http://localhost:9000/test/upload",
+			"Bucket": "test",
+			"Key": "upload",
+			"ETag": "\"8e817c8ccd442f9a79c77b58fe808c43-4\""
+		}
+		======================================== LIST ====
+
+		An error occurred (NoSuchUpload) when calling the ListParts operation: The specified multipart upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed.
+		======================================== GET PART 4 ====
+		{
+			"AcceptRanges": "bytes",
+			"LastModified": "2023-04-25T10:21:59+00:00",
+			"ContentLength": 20971520,
+			"ETag": "\"8e817c8ccd442f9a79c77b58fe808c43-4\"",
+			"ContentRange": "bytes 62914560-83886079/83886080",
+			"ContentType": "binary/octet-stream",
+			"Metadata": {},
+			"PartsCount": 4
+		}
+		1bd2383eebbac1f8e7143575ba5b1f4a  get-part4
+
+	
+	Conclusions:
+
+	- Parts are indeed renumbered with consecutive numbers
+	- ListParts only applies to multipart uploads in progress,
+	  it cannot be used once the multipart upload has been completed
+'
+
+export AWS_ACCESS_KEY_ID=1D8Pk2k4oQSoh1BU
+export AWS_SECRET_ACCESS_KEY=4B46SR8U7FUgY0raB8Zuxg1NLyLTvbNV
+
+function aws { command aws --endpoint-url http://localhost:9000 $@ ; }
+
+aws --version
+
+aws s3 mb s3://test
+
+for NUM in 1 4 5 6; do
+	dd if=/dev/urandom of=part$NUM bs=1M count=10
+done
+md5sum part*
+
+UPLOAD=$(aws s3api create-multipart-upload --bucket test --key 'upload' | jq -r ".UploadId")
+echo "Upload ID: $UPLOAD"
+
+PARTS=""
+
+for NUM in 1 4 5 6; do
+	ETAG=$(aws s3api upload-part --bucket test --key 'upload' --part-number $NUM \
+		--body "part$NUM" --upload-id "$UPLOAD" | jq -r ".ETag")
+	echo "PART $NUM ETag: $ETAG"
+	if [ -n "$PARTS" ]; then
+		PARTS="$PARTS,"
+	fi
+	PARTS="$PARTS {\"ETag\":$ETAG,\"PartNumber\":$NUM}"
+done
+
+echo "======================================== LIST ===="
+aws s3api list-parts --bucket test --key upload --upload-id "$UPLOAD" | jq
+
+echo "======================================== COMPLETE ===="
+echo "{\"Parts\":[$PARTS]}" > mpu
+aws s3api complete-multipart-upload --multipart-upload file://mpu \
+		--bucket test --key 'upload' --upload-id "$UPLOAD"
+
+echo "======================================== LIST ===="
+aws s3api list-parts --bucket test --key upload --upload-id "$UPLOAD" | jq
+
+echo "======================================== GET PART 4 ===="
+aws s3api get-object --bucket test --key upload --part-number 4 get-part4
+md5sum get-part4
--- a/script/test-skip-part.sh
+++ b/script/test-skip-part.sh
@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+
+: '
+	This script tests whether uploaded parts can be skipped in a
+	CompleteMultipartUpoad
+
+	On Minio: yes, parts can be skipped
+
+	On S3: not tested
+
+	Sample output (on Minio):
+
+		f23911bcd1230f5ebe8887cbf5bc396e  part1
+		a2657143167eaf647c40473e78a091dc  part4
+		72f72c02c5163bc81024b28ac818c5e0  part5
+		e29cf500d20498218904b8df8806caa2  part6
+		Upload ID: e8fe7b83-9800-46fb-ae90-9d7ccd42fe76
+		PART 1 ETag: "f23911bcd1230f5ebe8887cbf5bc396e"
+		PART 4 ETag: "a2657143167eaf647c40473e78a091dc"
+		PART 5 ETag: "72f72c02c5163bc81024b28ac818c5e0"
+		PART 6 ETag: "e29cf500d20498218904b8df8806caa2"
+		======================================== COMPLETE ====
+		{
+			"Location": "http://localhost:9000/test/upload",
+			"Bucket": "test",
+			"Key": "upload",
+			"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\""
+		}
+		======================================== GET FULL ====
+		{
+			"AcceptRanges": "bytes",
+			"LastModified": "2023-04-25T10:54:35+00:00",
+			"ContentLength": 31457280,
+			"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\"",
+			"ContentType": "binary/octet-stream",
+			"Metadata": {}
+		}
+		97fb904da7ad310699a6afab0eb6e061  get-full
+		97fb904da7ad310699a6afab0eb6e061  -
+		======================================== GET PART 3 ====
+		{
+			"AcceptRanges": "bytes",
+			"LastModified": "2023-04-25T10:54:35+00:00",
+			"ContentLength": 10485760,
+			"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\"",
+			"ContentRange": "bytes 20971520-31457279/31457280",
+			"ContentType": "binary/octet-stream",
+			"Metadata": {},
+			"PartsCount": 3
+		}
+		e29cf500d20498218904b8df8806caa2  get-part3
+
+	Conclusions:
+
+	- Skipping a part in a CompleteMultipartUpoad call is OK
+	- The part is simply not included in the stored object
+	- Sequential part renumbering counts only non-skipped parts
+'
+
+export AWS_ACCESS_KEY_ID=1D8Pk2k4oQSoh1BU
+export AWS_SECRET_ACCESS_KEY=4B46SR8U7FUgY0raB8Zuxg1NLyLTvbNV
+
+function aws { command aws --endpoint-url http://localhost:9000 $@ ; }
+
+aws --version
+
+aws s3 mb s3://test
+
+for NUM in 1 4 5 6; do
+	dd if=/dev/urandom of=part$NUM bs=1M count=10
+done
+md5sum part*
+
+UPLOAD=$(aws s3api create-multipart-upload --bucket test --key 'upload' | jq -r ".UploadId")
+echo "Upload ID: $UPLOAD"
+
+PARTS=""
+
+for NUM in 1 4 5 6; do
+	ETAG=$(aws s3api upload-part --bucket test --key 'upload' --part-number $NUM \
+		--body "part$NUM" --upload-id "$UPLOAD" | jq -r ".ETag")
+	echo "PART $NUM ETag: $ETAG"
+	if [ "$NUM" != "5" ]; then
+		if [ -n "$PARTS" ]; then
+			PARTS="$PARTS,"
+		fi
+		PARTS="$PARTS {\"ETag\":$ETAG,\"PartNumber\":$NUM}"
+	fi
+done
+
+echo "======================================== COMPLETE ===="
+echo "{\"Parts\":[$PARTS]}" > mpu
+aws s3api complete-multipart-upload --multipart-upload file://mpu \
+		--bucket test --key 'upload' --upload-id "$UPLOAD"
+
+echo "======================================== GET FULL ===="
+aws s3api get-object --bucket test --key upload get-full
+md5sum get-full
+cat part1 part4 part6 | md5sum
+
+echo "======================================== GET PART 3 ===="
+aws s3api get-object --bucket test --key upload --part-number 3 get-part3
+md5sum get-part3
--- a/script/test-smoke.sh
+++ b/script/test-smoke.sh
@ -31,6 +31,11 @@ dd if=/dev/urandom of=/tmp/garage.1.rnd bs=1k count=2 # No multipart, inline sto
 dd if=/dev/urandom of=/tmp/garage.2.rnd bs=1M count=5 # No multipart but file will be chunked
 dd if=/dev/urandom of=/tmp/garage.3.rnd bs=1M count=10 # by default, AWS starts using multipart at 8MB

+dd if=/dev/urandom of=/tmp/garage.part1.rnd bs=1M count=5
+dd if=/dev/urandom of=/tmp/garage.part2.rnd bs=1M count=5
+dd if=/dev/urandom of=/tmp/garage.part3.rnd bs=1M count=5
+dd if=/dev/urandom of=/tmp/garage.part4.rnd bs=1M count=5
+
 # data of lower entropy, to test compression
 dd if=/dev/urandom bs=1k count=2  | base64 -w0 > /tmp/garage.1.b64
 dd if=/dev/urandom bs=1M count=5  | base64 -w0 > /tmp/garage.2.b64
@ -40,7 +45,7 @@ echo "🧪 S3 API testing..."

 # AWS
 if [ -z "$SKIP_AWS" ]; then
-  echo "🛠️ Testing with awscli"
+  echo "🛠️ Testing with awscli (aws s3)"
  source ${SCRIPT_FOLDER}/dev-env-aws.sh
  aws s3 ls
  for idx in {1..3}.{rnd,b64}; do
@ -51,8 +56,36 @@ if [ -z "$SKIP_AWS" ]; then
    rm /tmp/garage.$idx.dl
    aws s3 rm "s3://eprouvette/&+-é\"/garage.$idx.aws"
  done
+
+  echo "🛠️ Testing multipart uploads with awscli (aws s3api)"
+  UPLOAD=$(aws s3api create-multipart-upload --bucket eprouvette --key 'upload' | jq -r ".UploadId")
+  echo "Upload ID: $UPLOAD"
+  ETAG3=$(aws s3api upload-part --bucket eprouvette --key 'upload' \
+      --part-number 3 --body "/tmp/garage.part1.rnd" --upload-id "$UPLOAD" \
+      | jq -r ".ETag")
+  ETAG2=$(aws s3api upload-part --bucket eprouvette --key 'upload' \
+      --part-number 2 --body "/tmp/garage.part2.rnd" --upload-id "$UPLOAD" \
+      | jq -r ".ETag")
+  ETAG3=$(aws s3api upload-part --bucket eprouvette --key 'upload' \
+      --part-number 3 --body "/tmp/garage.part3.rnd" --upload-id "$UPLOAD" \
+      | jq -r ".ETag")
+  ETAG6=$(aws s3api upload-part --bucket eprouvette --key 'upload' \
+      --part-number 6 --body "/tmp/garage.part4.rnd" --upload-id "$UPLOAD" \
+      | jq -r ".ETag")
+  MPU="{\"Parts\":[{\"PartNumber\":2,\"ETag\":$ETAG2}, {\"PartNumber\":3,\"ETag\":$ETAG3}, {\"PartNumber\":6,\"ETag\":$ETAG6}]}"
+  echo $MPU > /tmp/garage.mpu.json
+  aws s3api complete-multipart-upload --multipart-upload file:///tmp/garage.mpu.json \
+      --bucket eprouvette --key 'upload' --upload-id "$UPLOAD"
+  aws s3api get-object --bucket eprouvette --key upload /tmp/garage.mpu.get
+  if [ "$(md5sum /tmp/garage.mpu.get | cut -d ' ' -f 1)" != "$(cat /tmp/garage.part{2,3,4}.rnd | md5sum | cut -d ' ' -f 1)" ]; then
+    echo "Invalid multipart upload"
+    exit 1
+  fi
 fi

+echo "OK!!"
+exit 0
+
 # S3CMD
 if [ -z "$SKIP_S3CMD" ]; then
  echo "🛠️ Testing with s3cmd"
@ -141,6 +174,7 @@ rm eprouvette/winscp
 EOF
 fi

+rm /tmp/garage.part{1..4}.rnd
 rm /tmp/garage.{1..3}.{rnd,b64}

 echo "🏁 Teardown"
--- a/src/api/admin/bucket.rs
+++ b/src/api/admin/bucket.rs
@ -14,6 +14,7 @@ use garage_model::bucket_alias_table::*;
 use garage_model::bucket_table::*;
 use garage_model::garage::Garage;
 use garage_model::permission::*;
+use garage_model::s3::mpu_table;
 use garage_model::s3::object_table::*;

 use crate::admin::error::*;
@ -124,6 +125,14 @@ async fn bucket_info_results(
 		.map(|x| x.filtered_values(&garage.system.ring.borrow()))
 		.unwrap_or_default();

+	let mpu_counters = garage
+		.mpu_counter_table
+		.table
+		.get(&bucket_id, &EmptyKey)
+		.await?
+		.map(|x| x.filtered_values(&garage.system.ring.borrow()))
+		.unwrap_or_default();
+
 	let mut relevant_keys = HashMap::new();
 	for (k, _) in bucket
 		.state
@ -183,8 +192,8 @@ async fn bucket_info_results(
 				}
 			}),
 			keys: relevant_keys
-				.into_iter()
-				.map(|(_, key)| {
+				.into_values()
+				.map(|key| {
 					let p = key.state.as_option().unwrap();
 					GetBucketInfoKey {
 						access_key_id: key.key_id,
@ -208,12 +217,12 @@ async fn bucket_info_results(
 					}
 				})
 				.collect::<Vec<_>>(),
-			objects: counters.get(OBJECTS).cloned().unwrap_or_default(),
-			bytes: counters.get(BYTES).cloned().unwrap_or_default(),
-			unfinished_uploads: counters
-				.get(UNFINISHED_UPLOADS)
-				.cloned()
-				.unwrap_or_default(),
+			objects: *counters.get(OBJECTS).unwrap_or(&0),
+			bytes: *counters.get(BYTES).unwrap_or(&0),
+			unfinished_uploads: *counters.get(UNFINISHED_UPLOADS).unwrap_or(&0),
+			unfinished_multipart_uploads: *mpu_counters.get(mpu_table::UPLOADS).unwrap_or(&0),
+			unfinished_multipart_upload_parts: *mpu_counters.get(mpu_table::PARTS).unwrap_or(&0),
+			unfinished_multipart_upload_bytes: *mpu_counters.get(mpu_table::BYTES).unwrap_or(&0),
 			quotas: ApiBucketQuotas {
 				max_size: quotas.max_size,
 				max_objects: quotas.max_objects,
@ -235,6 +244,9 @@ struct GetBucketInfoResult {
 	objects: i64,
 	bytes: i64,
 	unfinished_uploads: i64,
+	unfinished_multipart_uploads: i64,
+	unfinished_multipart_upload_parts: i64,
+	unfinished_multipart_upload_bytes: i64,
 	quotas: ApiBucketQuotas,
 }

--- a/src/api/admin/key.rs
+++ b/src/api/admin/key.rs
@ -183,8 +183,8 @@ async fn key_info_results(garage: &Arc<Garage>, key: Key) -> Result<Response<Bod
 			create_bucket: *key_state.allow_create_bucket.get(),
 		},
 		buckets: relevant_buckets
-			.into_iter()
-			.map(|(_, bucket)| {
+			.into_values()
+			.map(|bucket| {
 				let state = bucket.state.as_option().unwrap();
 				KeyInfoBucketResult {
 					id: hex::encode(bucket.id),
--- a/src/api/s3/api_server.rs
+++ b/src/api/s3/api_server.rs
@ -27,6 +27,7 @@ use crate::s3::cors::*;
 use crate::s3::delete::*;
 use crate::s3::get::*;
 use crate::s3::list::*;
+use crate::s3::multipart::*;
 use crate::s3::post_object::handle_post_object;
 use crate::s3::put::*;
 use crate::s3::router::Endpoint;
@ -256,7 +257,7 @@ impl ApiHandler for S3ApiServer {
 							bucket_name,
 							bucket_id,
 							delimiter: delimiter.map(|d| d.to_string()),
-							page_size: max_keys.map(|p| p.clamp(1, 1000)).unwrap_or(1000),
+							page_size: max_keys.unwrap_or(1000).clamp(1, 1000),
 							prefix: prefix.unwrap_or_default(),
 							urlencode_resp: encoding_type.map(|e| e == "url").unwrap_or(false),
 						},
@ -286,7 +287,7 @@ impl ApiHandler for S3ApiServer {
 								bucket_name,
 								bucket_id,
 								delimiter: delimiter.map(|d| d.to_string()),
-								page_size: max_keys.map(|p| p.clamp(1, 1000)).unwrap_or(1000),
+								page_size: max_keys.unwrap_or(1000).clamp(1, 1000),
 								urlencode_resp: encoding_type.map(|e| e == "url").unwrap_or(false),
 								prefix: prefix.unwrap_or_default(),
 							},
@ -319,7 +320,7 @@ impl ApiHandler for S3ApiServer {
 							bucket_name,
 							bucket_id,
 							delimiter: delimiter.map(|d| d.to_string()),
-							page_size: max_uploads.map(|p| p.clamp(1, 1000)).unwrap_or(1000),
+							page_size: max_uploads.unwrap_or(1000).clamp(1, 1000),
 							prefix: prefix.unwrap_or_default(),
 							urlencode_resp: encoding_type.map(|e| e == "url").unwrap_or(false),
 						},
@ -343,7 +344,7 @@ impl ApiHandler for S3ApiServer {
 						key,
 						upload_id,
 						part_number_marker: part_number_marker.map(|p| p.clamp(1, 10000)),
-						max_parts: max_parts.map(|p| p.clamp(1, 1000)).unwrap_or(1000),
+						max_parts: max_parts.unwrap_or(1000).clamp(1, 1000),
 					},
 				)
 				.await
--- a/src/api/s3/copy.rs
+++ b/src/api/s3/copy.rs
@ -2,7 +2,7 @@ use std::pin::Pin;
 use std::sync::Arc;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};

-use futures::{stream, stream::Stream, StreamExt, TryFutureExt};
+use futures::{stream, stream::Stream, StreamExt};
 use md5::{Digest as Md5Digest, Md5};

 use bytes::Bytes;
@ -18,12 +18,14 @@ use garage_util::time::*;
 use garage_model::garage::Garage;
 use garage_model::key_table::Key;
 use garage_model::s3::block_ref_table::*;
+use garage_model::s3::mpu_table::*;
 use garage_model::s3::object_table::*;
 use garage_model::s3::version_table::*;

 use crate::helpers::parse_bucket_key;
 use crate::s3::error::*;
-use crate::s3::put::{decode_upload_id, get_headers};
+use crate::s3::multipart;
+use crate::s3::put::get_headers;
 use crate::s3::xml::{self as s3_xml, xmlns_tag};

 pub async fn handle_copy(
@ -92,7 +94,10 @@ pub async fn handle_copy(
 			let tmp_dest_object_version = ObjectVersion {
 				uuid: new_uuid,
 				timestamp: new_timestamp,
-				state: ObjectVersionState::Uploading(new_meta.headers.clone()),
+				state: ObjectVersionState::Uploading {
+					headers: new_meta.headers.clone(),
+					multipart: false,
+				},
 			};
 			let tmp_dest_object = Object::new(
 				dest_bucket_id,
@ -105,8 +110,14 @@ pub async fn handle_copy(
 			// this means that the BlockRef entries linked to this version cannot be
 			// marked as deleted (they are marked as deleted only if the Version
 			// doesn't exist or is marked as deleted).
-			let mut dest_version =
-				Version::new(new_uuid, dest_bucket_id, dest_key.to_string(), false);
+			let mut dest_version = Version::new(
+				new_uuid,
+				VersionBacklink::Object {
+					bucket_id: dest_bucket_id,
+					key: dest_key.to_string(),
+				},
+				false,
+			);
 			garage.version_table.insert(&dest_version).await?;

 			// Fill in block list for version and insert block refs
@ -179,17 +190,13 @@ pub async fn handle_upload_part_copy(
 ) -> Result<Response<Body>, Error> {
 	let copy_precondition = CopyPreconditionHeaders::parse(req)?;

-	let dest_version_uuid = decode_upload_id(upload_id)?;
+	let dest_upload_id = multipart::decode_upload_id(upload_id)?;

 	let dest_key = dest_key.to_string();
-	let (source_object, dest_object) = futures::try_join!(
+	let (source_object, (_, _, mut dest_mpu)) = futures::try_join!(
 		get_copy_source(&garage, api_key, req),
-		garage
-			.object_table
-			.get(&dest_bucket_id, &dest_key)
-			.map_err(Error::from),
+		multipart::get_upload(&garage, &dest_bucket_id, &dest_key, &dest_upload_id)
 	)?;
-	let dest_object = dest_object.ok_or(Error::NoSuchKey)?;

 	let (source_object_version, source_version_data, source_version_meta) =
 		extract_source_info(&source_object)?;
@ -217,15 +224,6 @@ pub async fn handle_upload_part_copy(
 		},
 	};

-	// Check destination version is indeed in uploading state
-	if !dest_object
-		.versions()
-		.iter()
-		.any(|v| v.uuid == dest_version_uuid && v.is_uploading())
-	{
-		return Err(Error::NoSuchUpload);
-	}
-
 	// Check source version is not inlined
 	match source_version_data {
 		ObjectVersionData::DeleteMarker => unreachable!(),
@ -242,23 +240,11 @@ pub async fn handle_upload_part_copy(

 	// Fetch source versin with its block list,
 	// and destination version to check part hasn't yet been uploaded
-	let (source_version, dest_version) = futures::try_join!(
-		garage
-			.version_table
-			.get(&source_object_version.uuid, &EmptyKey),
-		garage.version_table.get(&dest_version_uuid, &EmptyKey),
-	)?;
-	let source_version = source_version.ok_or(Error::NoSuchKey)?;
-
-	// Check this part number hasn't yet been uploaded
-	if let Some(dv) = dest_version {
-		if dv.has_part_number(part_number) {
-			return Err(Error::bad_request(format!(
-				"Part number {} has already been uploaded",
-				part_number
-			)));
-		}
-	}
+	let source_version = garage
+		.version_table
+		.get(&source_object_version.uuid, &EmptyKey)
+		.await?
+		.ok_or(Error::NoSuchKey)?;

 	// We want to reuse blocks from the source version as much as possible.
 	// However, we still need to get the data from these blocks
@ -299,6 +285,33 @@ pub async fn handle_upload_part_copy(
 		current_offset = block_end;
 	}

+	// Calculate the identity of destination part: timestamp, version id
+	let dest_version_id = gen_uuid();
+	let dest_mpu_part_key = MpuPartKey {
+		part_number,
+		timestamp: dest_mpu.next_timestamp(part_number),
+	};
+
+	// Create the uploaded part
+	dest_mpu.parts.clear();
+	dest_mpu.parts.put(
+		dest_mpu_part_key,
+		MpuPart {
+			version: dest_version_id,
+			etag: None,
+			size: None,
+		},
+	);
+	garage.mpu_table.insert(&dest_mpu).await?;
+
+	let mut dest_version = Version::new(
+		dest_version_id,
+		VersionBacklink::MultipartUpload {
+			upload_id: dest_upload_id,
+		},
+		false,
+	);
+
 	// Now, actually copy the blocks
 	let mut md5hasher = Md5::new();

@ -348,8 +361,8 @@ pub async fn handle_upload_part_copy(
 		let must_upload = existing_block_hash.is_none();
 		let final_hash = existing_block_hash.unwrap_or_else(|| blake2sum(&data[..]));

-		let mut version = Version::new(dest_version_uuid, dest_bucket_id, dest_key.clone(), false);
-		version.blocks.put(
+		dest_version.blocks.clear();
+		dest_version.blocks.put(
 			VersionBlockKey {
 				part_number,
 				offset: current_offset,
@ -363,7 +376,7 @@ pub async fn handle_upload_part_copy(

 		let block_ref = BlockRef {
 			block: final_hash,
-			version: dest_version_uuid,
+			version: dest_version_id,
 			deleted: false.into(),
 		};

@ -378,23 +391,33 @@ pub async fn handle_upload_part_copy(
 					Ok(())
 				}
 			},
-			// Thing 2: we need to insert the block in the version
-			garage.version_table.insert(&version),
-			// Thing 3: we need to add a block reference
-			garage.block_ref_table.insert(&block_ref),
+			async {
+				// Thing 2: we need to insert the block in the version
+				garage.version_table.insert(&dest_version).await?;
+				// Thing 3: we need to add a block reference
+				garage.block_ref_table.insert(&block_ref).await
+			},
 			// Thing 4: we need to prefetch the next block
 			defragmenter.next(),
 		)?;
-		next_block = res.3;
+		next_block = res.2;
 	}

+	assert_eq!(current_offset, source_range.length);
+
 	let data_md5sum = md5hasher.finalize();
 	let etag = hex::encode(data_md5sum);

 	// Put the part's ETag in the Versiontable
-	let mut version = Version::new(dest_version_uuid, dest_bucket_id, dest_key.clone(), false);
-	version.parts_etags.put(part_number, etag.clone());
-	garage.version_table.insert(&version).await?;
+	dest_mpu.parts.put(
+		dest_mpu_part_key,
+		MpuPart {
+			version: dest_version_id,
+			etag: Some(etag.clone()),
+			size: Some(current_offset),
+		},
+	);
+	garage.mpu_table.insert(&dest_mpu).await?;

 	// LGTM
 	let resp_xml = s3_xml::to_xml_with_header(&CopyPartResult {
--- a/src/api/s3/get.rs
+++ b/src/api/s3/get.rs
@ -149,7 +149,6 @@ pub async fn handle_head(

 				let (part_offset, part_end) =
 					calculate_part_bounds(&version, pn).ok_or(Error::InvalidPart)?;
-				let n_parts = version.parts_etags.items().len();

 				Ok(object_headers(object_version, version_meta)
 					.header(CONTENT_LENGTH, format!("{}", part_end - part_offset))
@ -162,7 +161,7 @@ pub async fn handle_head(
 							version_meta.size
 						),
 					)
-					.header(X_AMZ_MP_PARTS_COUNT, format!("{}", n_parts))
+					.header(X_AMZ_MP_PARTS_COUNT, format!("{}", version.n_parts()?))
 					.status(StatusCode::PARTIAL_CONTENT)
 					.body(Body::empty())?)
 			}
@ -376,7 +375,6 @@ async fn handle_get_part(

 			let (begin, end) =
 				calculate_part_bounds(&version, part_number).ok_or(Error::InvalidPart)?;
-			let n_parts = version.parts_etags.items().len();

 			let body = body_from_blocks_range(garage, version.blocks.items(), begin, end);

@ -386,7 +384,7 @@ async fn handle_get_part(
 					CONTENT_RANGE,
 					format!("bytes {}-{}/{}", begin, end - 1, version_meta.size),
 				)
-				.header(X_AMZ_MP_PARTS_COUNT, format!("{}", n_parts))
+				.header(X_AMZ_MP_PARTS_COUNT, format!("{}", version.n_parts()?))
 				.body(body)?)
 		}
 		_ => unreachable!(),
@ -443,7 +441,7 @@ fn body_from_blocks_range(
 	// block.part_number, which is not the same in the case of a multipart upload)
 	let mut blocks: Vec<(VersionBlock, u64)> = Vec::with_capacity(std::cmp::min(
 		all_blocks.len(),
-		4 + ((end - begin) / std::cmp::max(all_blocks[0].1.size as u64, 1024)) as usize,
+		4 + ((end - begin) / std::cmp::max(all_blocks[0].1.size, 1024)) as usize,
 	));
 	let mut block_offset: u64 = 0;
 	for (_, b) in all_blocks.iter() {
@ -454,7 +452,7 @@ fn body_from_blocks_range(
 		if block_offset < end && block_offset + b.size > begin {
 			blocks.push((*b, block_offset));
 		}
-		block_offset += b.size as u64;
+		block_offset += b.size;
 	}

 	let order_stream = OrderTag::stream();
--- a/src/api/s3/list.rs
+++ b/src/api/s3/list.rs
@ -1,4 +1,3 @@
-use std::cmp::Ordering;
 use std::collections::{BTreeMap, BTreeSet};
 use std::iter::{Iterator, Peekable};
 use std::sync::Arc;
@ -11,15 +10,15 @@ use garage_util::error::Error as GarageError;
 use garage_util::time::*;

 use garage_model::garage::Garage;
+use garage_model::s3::mpu_table::*;
 use garage_model::s3::object_table::*;
-use garage_model::s3::version_table::Version;

-use garage_table::{EmptyKey, EnumerationOrder};
+use garage_table::EnumerationOrder;

 use crate::encoding::*;
 use crate::helpers::key_after_prefix;
 use crate::s3::error::*;
-use crate::s3::put as s3_put;
+use crate::s3::multipart as s3_multipart;
 use crate::s3::xml as s3_xml;

 const DUMMY_NAME: &str = "Dummy Key";
@ -176,7 +175,9 @@ pub async fn handle_list_multipart_upload(
 			t.get_range(
 				&bucket,
 				key,
-				Some(ObjectFilter::IsUploading),
+				Some(ObjectFilter::IsUploading {
+					check_multipart: Some(true),
+				}),
 				count,
 				EnumerationOrder::Forward,
 			)
@ -272,24 +273,26 @@ pub async fn handle_list_parts(
 ) -> Result<Response<Body>, Error> {
 	debug!("ListParts {:?}", query);

-	let upload_id = s3_put::decode_upload_id(&query.upload_id)?;
+	let upload_id = s3_multipart::decode_upload_id(&query.upload_id)?;

-	let (object, version) = futures::try_join!(
-		garage.object_table.get(&query.bucket_id, &query.key),
-		garage.version_table.get(&upload_id, &EmptyKey),
-	)?;
+	let (_, _, mpu) =
+		s3_multipart::get_upload(&garage, &query.bucket_id, &query.key, &upload_id).await?;

-	let (info, next) = fetch_part_info(query, object, version, upload_id)?;
+	let (info, next) = fetch_part_info(query, &mpu)?;

 	let result = s3_xml::ListPartsResult {
 		xmlns: (),
+
+		// Query parameters
 		bucket: s3_xml::Value(query.bucket_name.to_string()),
 		key: s3_xml::Value(query.key.to_string()),
 		upload_id: s3_xml::Value(query.upload_id.to_string()),
 		part_number_marker: query.part_number_marker.map(|e| s3_xml::IntValue(e as i64)),
-		next_part_number_marker: next.map(|e| s3_xml::IntValue(e as i64)),
 		max_parts: s3_xml::IntValue(query.max_parts as i64),
-		is_truncated: s3_xml::Value(next.map(|_| "true").unwrap_or("false").to_string()),
+
+		// Result values
+		next_part_number_marker: next.map(|e| s3_xml::IntValue(e as i64)),
+		is_truncated: s3_xml::Value(format!("{}", next.is_some())),
 		parts: info
 			.iter()
 			.map(|part| s3_xml::PartItem {
@ -299,6 +302,8 @@ pub async fn handle_list_parts(
 				size: s3_xml::IntValue(part.size as i64),
 			})
 			.collect(),
+
+		// Dummy result values (unsupported features)
 		initiator: s3_xml::Initiator {
 			display_name: s3_xml::Value(DUMMY_NAME.to_string()),
 			id: s3_xml::Value(DUMMY_KEY.to_string()),
@ -335,8 +340,8 @@ struct UploadInfo {
 }

 #[derive(Debug, PartialEq)]
-struct PartInfo {
-	etag: String,
+struct PartInfo<'a> {
+	etag: &'a str,
 	timestamp: u64,
 	part_number: u64,
 	size: u64,
@ -456,107 +461,51 @@ where
 	}
 }

-fn fetch_part_info(
+fn fetch_part_info<'a>(
 	query: &ListPartsQuery,
-	object: Option<Object>,
-	version: Option<Version>,
-	upload_id: Uuid,
-) -> Result<(Vec<PartInfo>, Option<u64>), Error> {
-	// Check results
-	let object = object.ok_or(Error::NoSuchKey)?;
+	mpu: &'a MultipartUpload,
+) -> Result<(Vec<PartInfo<'a>>, Option<u64>), Error> {
+	assert!((1..=1000).contains(&query.max_parts)); // see s3/api_server.rs

-	let obj_version = object
-		.versions()
-		.iter()
-		.find(|v| v.uuid == upload_id && v.is_uploading())
-		.ok_or(Error::NoSuchUpload)?;
-
-	let version = version.ok_or(Error::NoSuchKey)?;
-
-	// Cut the beginning of our 2 vectors if required
-	let (etags, blocks) = match &query.part_number_marker {
-		Some(marker) => {
-			let next = marker + 1;
-
-			let part_idx = into_ok_or_err(
-				version
-					.parts_etags
-					.items()
-					.binary_search_by(|(part_num, _)| part_num.cmp(&next)),
-			);
-			let parts = &version.parts_etags.items()[part_idx..];
-
-			let block_idx = into_ok_or_err(
-				version
-					.blocks
-					.items()
-					.binary_search_by(|(vkey, _)| vkey.part_number.cmp(&next)),
-			);
-			let blocks = &version.blocks.items()[block_idx..];
-
-			(parts, blocks)
-		}
-		None => (version.parts_etags.items(), version.blocks.items()),
-	};
-
-	// Use the block vector to compute a (part_number, size) vector
-	let mut size = Vec::<(u64, u64)>::new();
-	blocks.iter().for_each(|(key, val)| {
-		let mut new_size = val.size;
-		match size.pop() {
-			Some((part_number, size)) if part_number == key.part_number => new_size += size,
-			Some(v) => size.push(v),
-			None => (),
-		}
-		size.push((key.part_number, new_size))
-	});
-
-	// Merge the etag vector and size vector to build a PartInfo vector
-	let max_parts = query.max_parts as usize;
-	let (mut etag_iter, mut size_iter) = (etags.iter().peekable(), size.iter().peekable());
-
-	let mut info = Vec::<PartInfo>::with_capacity(max_parts);
-
-	while info.len() < max_parts {
-		match (etag_iter.peek(), size_iter.peek()) {
-			(Some((ep, etag)), Some((sp, size))) => match ep.cmp(sp) {
-				Ordering::Less => {
-					debug!("ETag information ignored due to missing corresponding block information. Query: {:?}", query);
-					etag_iter.next();
+	// Parse multipart upload part list, removing parts not yet finished
+	// and failed part uploads that were overwritten
+	let mut parts: Vec<PartInfo<'a>> = Vec::with_capacity(mpu.parts.items().len());
+	for (pk, p) in mpu.parts.items().iter() {
+		if let (Some(etag), Some(size)) = (&p.etag, p.size) {
+			let part_info = PartInfo {
+				part_number: pk.part_number,
+				timestamp: pk.timestamp,
+				etag,
+				size,
+			};
+			match parts.last_mut() {
+				Some(lastpart) if lastpart.part_number == pk.part_number => {
+					*lastpart = part_info;
 				}
-				Ordering::Equal => {
-					info.push(PartInfo {
-						etag: etag.to_string(),
-						timestamp: obj_version.timestamp,
-						part_number: *ep,
-						size: *size,
-					});
-					etag_iter.next();
-					size_iter.next();
+				_ => {
+					parts.push(part_info);
 				}
-				Ordering::Greater => {
-					debug!("Block information ignored due to missing corresponding ETag information. Query: {:?}", query);
-					size_iter.next();
-				}
-			},
-			(None, None) => return Ok((info, None)),
-			_ => {
-				debug!(
-					"Additional block or ETag information ignored. Query: {:?}",
-					query
-				);
-				return Ok((info, None));
 			}
 		}
 	}

-	match info.last() {
-		Some(part_info) => {
-			let pagination = Some(part_info.part_number);
-			Ok((info, pagination))
-		}
-		None => Ok((info, None)),
+	// Cut the beginning if we have a marker
+	if let Some(marker) = &query.part_number_marker {
+		let next = marker + 1;
+		let part_idx = parts
+			.binary_search_by(|part| part.part_number.cmp(&next))
+			.unwrap_or_else(|x| x);
+		parts = parts.split_off(part_idx);
 	}
+
+	// Cut the end if we have too many parts
+	if parts.len() > query.max_parts as usize {
+		parts.truncate(query.max_parts as usize);
+		let pagination = Some(parts.last().unwrap().part_number);
+		return Ok((parts, pagination));
+	}
+
+	Ok((parts, None))
 }

 /*
@ -651,7 +600,7 @@ impl ListMultipartUploadsQuery {
 				}),
 				uuid => Ok(RangeBegin::AfterUpload {
 					key: key_marker.to_string(),
-					upload: s3_put::decode_upload_id(uuid)?,
+					upload: s3_multipart::decode_upload_id(uuid)?,
 				}),
 			},

@ -843,7 +792,7 @@ impl ExtractAccumulator for UploadAccumulator {
 		let mut uploads_for_key = object
 			.versions()
 			.iter()
-			.filter(|x| x.is_uploading())
+			.filter(|x| x.is_uploading(Some(true)))
 			.collect::<Vec<&ObjectVersion>>();

 		// S3 logic requires lexicographically sorted upload ids.
@ -918,14 +867,6 @@ impl ExtractAccumulator for UploadAccumulator {
 * Utility functions
 */

-/// This is a stub for Result::into_ok_or_err that is not yet in Rust stable
-fn into_ok_or_err<T>(r: Result<T, T>) -> T {
-	match r {
-		Ok(r) => r,
-		Err(r) => r,
-	}
-}
-
 /// Returns the common prefix of the object given the query prefix and delimiter
 fn common_prefix<'a>(object: &'a Object, query: &ListQueryCommon) -> Option<&'a str> {
 	match &query.delimiter {
@ -951,7 +892,6 @@ fn uriencode_maybe(s: &str, yes: bool) -> s3_xml::Value {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use garage_model::s3::version_table::*;
 	use garage_util::*;
 	use std::iter::FromIterator;

@ -991,10 +931,13 @@ mod tests {
 		ObjectVersion {
 			uuid: Uuid::from(uuid),
 			timestamp: TS,
-			state: ObjectVersionState::Uploading(ObjectVersionHeaders {
-				content_type: "text/plain".to_string(),
-				other: BTreeMap::<String, String>::new(),
-			}),
+			state: ObjectVersionState::Uploading {
+				multipart: true,
+				headers: ObjectVersionHeaders {
+					content_type: "text/plain".to_string(),
+					other: BTreeMap::<String, String>::new(),
+				},
+			},
 		}
 	}

@ -1169,83 +1112,76 @@ mod tests {
 		Ok(())
 	}

-	fn version() -> Version {
+	fn mpu() -> MultipartUpload {
 		let uuid = Uuid::from([0x08; 32]);

-		let blocks = vec![
+		let parts = vec![
 			(
-				VersionBlockKey {
+				MpuPartKey {
 					part_number: 1,
-					offset: 1,
+					timestamp: TS,
 				},
-				VersionBlock {
-					hash: uuid,
-					size: 3,
+				MpuPart {
+					version: uuid,
+					size: Some(3),
+					etag: Some("etag1".into()),
 				},
 			),
 			(
-				VersionBlockKey {
-					part_number: 1,
-					offset: 2,
-				},
-				VersionBlock {
-					hash: uuid,
-					size: 2,
-				},
-			),
-			(
-				VersionBlockKey {
+				MpuPartKey {
 					part_number: 2,
-					offset: 1,
+					timestamp: TS,
 				},
-				VersionBlock {
-					hash: uuid,
-					size: 8,
+				MpuPart {
+					version: uuid,
+					size: None,
+					etag: None,
 				},
 			),
 			(
-				VersionBlockKey {
+				MpuPartKey {
+					part_number: 3,
+					timestamp: TS,
+				},
+				MpuPart {
+					version: uuid,
+					size: Some(10),
+					etag: Some("etag2".into()),
+				},
+			),
+			(
+				MpuPartKey {
 					part_number: 5,
-					offset: 1,
+					timestamp: TS,
 				},
-				VersionBlock {
-					hash: uuid,
-					size: 7,
+				MpuPart {
+					version: uuid,
+					size: Some(7),
+					etag: Some("etag3".into()),
 				},
 			),
 			(
-				VersionBlockKey {
+				MpuPartKey {
 					part_number: 8,
-					offset: 1,
+					timestamp: TS,
 				},
-				VersionBlock {
-					hash: uuid,
-					size: 5,
+				MpuPart {
+					version: uuid,
+					size: Some(5),
+					etag: Some("etag4".into()),
 				},
 			),
 		];
-		let etags = vec![
-			(1, "etag1".to_string()),
-			(3, "etag2".to_string()),
-			(5, "etag3".to_string()),
-			(8, "etag4".to_string()),
-			(9, "etag5".to_string()),
-		];

-		Version {
-			bucket_id: uuid,
-			key: "a".to_string(),
-			uuid,
+		MultipartUpload {
+			upload_id: uuid,
 			deleted: false.into(),
-			blocks: crdt::Map::<VersionBlockKey, VersionBlock>::from_iter(blocks),
-			parts_etags: crdt::Map::<u64, String>::from_iter(etags),
+			parts: crdt::Map::<MpuPartKey, MpuPart>::from_iter(parts),
+			bucket_id: uuid,
+			key: "a".into(),
 		}
 	}

-	fn obj() -> Object {
-		Object::new(bucket(), "d".to_string(), vec![objup_version([0x08; 32])])
-	}
-
 	#[test]
 	fn test_fetch_part_info() -> Result<(), Error> {
 		let uuid = Uuid::from([0x08; 32]);
@ -1258,82 +1194,85 @@ mod tests {
 			max_parts: 2,
 		};

-		assert!(
-			fetch_part_info(&query, None, None, uuid).is_err(),
-			"No object and version should fail"
-		);
-		assert!(
-			fetch_part_info(&query, Some(obj()), None, uuid).is_err(),
-			"No version should faild"
-		);
-		assert!(
-			fetch_part_info(&query, None, Some(version()), uuid).is_err(),
-			"No object should fail"
-		);
+		let mpu = mpu();

 		// Start from the beginning but with limited size to trigger pagination
-		let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
-		assert_eq!(pagination.unwrap(), 5);
+		let (info, pagination) = fetch_part_info(&query, &mpu)?;
+		assert_eq!(pagination.unwrap(), 3);
 		assert_eq!(
 			info,
 			vec![
 				PartInfo {
-					etag: "etag1".to_string(),
+					etag: "etag1",
 					timestamp: TS,
 					part_number: 1,
-					size: 5
+					size: 3
 				},
 				PartInfo {
-					etag: "etag3".to_string(),
+					etag: "etag2",
 					timestamp: TS,
-					part_number: 5,
-					size: 7
+					part_number: 3,
+					size: 10
 				},
 			]
 		);

 		// Use previous pagination to make a new request
 		query.part_number_marker = Some(pagination.unwrap());
-		let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
+		let (info, pagination) = fetch_part_info(&query, &mpu)?;
 		assert!(pagination.is_none());
 		assert_eq!(
 			info,
-			vec![PartInfo {
-				etag: "etag4".to_string(),
-				timestamp: TS,
-				part_number: 8,
-				size: 5
-			},]
+			vec![
+				PartInfo {
+					etag: "etag3",
+					timestamp: TS,
+					part_number: 5,
+					size: 7
+				},
+				PartInfo {
+					etag: "etag4",
+					timestamp: TS,
+					part_number: 8,
+					size: 5
+				},
+			]
 		);

 		// Trying to access a part that is way larger than registered ones
 		query.part_number_marker = Some(9999);
-		let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
+		let (info, pagination) = fetch_part_info(&query, &mpu)?;
 		assert!(pagination.is_none());
 		assert_eq!(info, vec![]);

 		// Try without any limitation
 		query.max_parts = 1000;
 		query.part_number_marker = None;
-		let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
+		let (info, pagination) = fetch_part_info(&query, &mpu)?;
 		assert!(pagination.is_none());
 		assert_eq!(
 			info,
 			vec![
 				PartInfo {
-					etag: "etag1".to_string(),
+					etag: "etag1",
 					timestamp: TS,
 					part_number: 1,
-					size: 5
+					size: 3
 				},
 				PartInfo {
-					etag: "etag3".to_string(),
+					etag: "etag2",
+					timestamp: TS,
+					part_number: 3,
+					size: 10
+				},
+				PartInfo {
+					etag: "etag3",
 					timestamp: TS,
 					part_number: 5,
 					size: 7
 				},
 				PartInfo {
-					etag: "etag4".to_string(),
+					etag: "etag4",
 					timestamp: TS,
 					part_number: 8,
 					size: 5
--- a/src/api/s3/mod.rs
+++ b/src/api/s3/mod.rs
@ -7,6 +7,7 @@ pub mod cors;
 mod delete;
 pub mod get;
 mod list;
+mod multipart;
 mod post_object;
 mod put;
 mod website;
--- a/src/api/s3/multipart.rs
+++ b/src/api/s3/multipart.rs
@ -0,0 +1,464 @@
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use futures::prelude::*;
+use hyper::body::Body;
+use hyper::{Request, Response};
+use md5::{Digest as Md5Digest, Md5};
+
+use garage_table::*;
+use garage_util::async_hash::*;
+use garage_util::data::*;
+use garage_util::time::*;
+
+use garage_model::bucket_table::Bucket;
+use garage_model::garage::Garage;
+use garage_model::s3::block_ref_table::*;
+use garage_model::s3::mpu_table::*;
+use garage_model::s3::object_table::*;
+use garage_model::s3::version_table::*;
+
+use crate::s3::error::*;
+use crate::s3::put::*;
+use crate::s3::xml as s3_xml;
+use crate::signature::verify_signed_content;
+
+// ----
+
+pub async fn handle_create_multipart_upload(
+	garage: Arc<Garage>,
+	req: &Request<Body>,
+	bucket_name: &str,
+	bucket_id: Uuid,
+	key: &str,
+) -> Result<Response<Body>, Error> {
+	let upload_id = gen_uuid();
+	let headers = get_headers(req.headers())?;
+
+	// Create object in object table
+	let object_version = ObjectVersion {
+		uuid: upload_id,
+		timestamp: now_msec(),
+		state: ObjectVersionState::Uploading {
+			multipart: true,
+			headers,
+		},
+	};
+	let object = Object::new(bucket_id, key.to_string(), vec![object_version]);
+	garage.object_table.insert(&object).await?;
+
+	// Create multipart upload in mpu table
+	// This multipart upload will hold references to uploaded parts
+	// (which are entries in the Version table)
+	let mpu = MultipartUpload::new(upload_id, bucket_id, key.into(), false);
+	garage.mpu_table.insert(&mpu).await?;
+
+	// Send success response
+	let result = s3_xml::InitiateMultipartUploadResult {
+		xmlns: (),
+		bucket: s3_xml::Value(bucket_name.to_string()),
+		key: s3_xml::Value(key.to_string()),
+		upload_id: s3_xml::Value(hex::encode(upload_id)),
+	};
+	let xml = s3_xml::to_xml_with_header(&result)?;
+
+	Ok(Response::new(Body::from(xml.into_bytes())))
+}
+
+pub async fn handle_put_part(
+	garage: Arc<Garage>,
+	req: Request<Body>,
+	bucket_id: Uuid,
+	key: &str,
+	part_number: u64,
+	upload_id: &str,
+	content_sha256: Option<Hash>,
+) -> Result<Response<Body>, Error> {
+	let upload_id = decode_upload_id(upload_id)?;
+
+	let content_md5 = match req.headers().get("content-md5") {
+		Some(x) => Some(x.to_str()?.to_string()),
+		None => None,
+	};
+
+	// Read first chuck, and at the same time try to get object to see if it exists
+	let key = key.to_string();
+
+	let body = req.into_body().map_err(Error::from);
+	let mut chunker = StreamChunker::new(body, garage.config.block_size);
+
+	let ((_, _, mut mpu), first_block) = futures::try_join!(
+		get_upload(&garage, &bucket_id, &key, &upload_id),
+		chunker.next(),
+	)?;
+
+	// Check object is valid and part can be accepted
+	let first_block = first_block.ok_or_bad_request("Empty body")?;
+
+	// Calculate part identity: timestamp, version id
+	let version_uuid = gen_uuid();
+	let mpu_part_key = MpuPartKey {
+		part_number,
+		timestamp: mpu.next_timestamp(part_number),
+	};
+
+	// The following consists in many steps that can each fail.
+	// Keep track that some cleanup will be needed if things fail
+	// before everything is finished (cleanup is done using the Drop trait).
+	let mut interrupted_cleanup = InterruptedCleanup(Some(InterruptedCleanupInner {
+		garage: garage.clone(),
+		upload_id,
+		version_uuid,
+	}));
+
+	// Create version and link version from MPU
+	mpu.parts.clear();
+	mpu.parts.put(
+		mpu_part_key,
+		MpuPart {
+			version: version_uuid,
+			etag: None,
+			size: None,
+		},
+	);
+	garage.mpu_table.insert(&mpu).await?;
+
+	let version = Version::new(
+		version_uuid,
+		VersionBacklink::MultipartUpload { upload_id },
+		false,
+	);
+	garage.version_table.insert(&version).await?;
+
+	// Copy data to version
+	let first_block_hash = async_blake2sum(first_block.clone()).await;
+
+	let (total_size, data_md5sum, data_sha256sum) = read_and_put_blocks(
+		&garage,
+		&version,
+		part_number,
+		first_block,
+		first_block_hash,
+		&mut chunker,
+	)
+	.await?;
+
+	// Verify that checksums map
+	ensure_checksum_matches(
+		data_md5sum.as_slice(),
+		data_sha256sum,
+		content_md5.as_deref(),
+		content_sha256,
+	)?;
+
+	// Store part etag in version
+	let data_md5sum_hex = hex::encode(data_md5sum);
+	mpu.parts.put(
+		mpu_part_key,
+		MpuPart {
+			version: version_uuid,
+			etag: Some(data_md5sum_hex.clone()),
+			size: Some(total_size),
+		},
+	);
+	garage.mpu_table.insert(&mpu).await?;
+
+	// We were not interrupted, everything went fine.
+	// We won't have to clean up on drop.
+	interrupted_cleanup.cancel();
+
+	let response = Response::builder()
+		.header("ETag", format!("\"{}\"", data_md5sum_hex))
+		.body(Body::empty())
+		.unwrap();
+	Ok(response)
+}
+
+struct InterruptedCleanup(Option<InterruptedCleanupInner>);
+struct InterruptedCleanupInner {
+	garage: Arc<Garage>,
+	upload_id: Uuid,
+	version_uuid: Uuid,
+}
+
+impl InterruptedCleanup {
+	fn cancel(&mut self) {
+		drop(self.0.take());
+	}
+}
+impl Drop for InterruptedCleanup {
+	fn drop(&mut self) {
+		if let Some(info) = self.0.take() {
+			tokio::spawn(async move {
+				let version = Version::new(
+					info.version_uuid,
+					VersionBacklink::MultipartUpload {
+						upload_id: info.upload_id,
+					},
+					true,
+				);
+				if let Err(e) = info.garage.version_table.insert(&version).await {
+					warn!("Cannot cleanup after aborted UploadPart: {}", e);
+				}
+			});
+		}
+	}
+}
+
+pub async fn handle_complete_multipart_upload(
+	garage: Arc<Garage>,
+	req: Request<Body>,
+	bucket_name: &str,
+	bucket: &Bucket,
+	key: &str,
+	upload_id: &str,
+	content_sha256: Option<Hash>,
+) -> Result<Response<Body>, Error> {
+	let body = hyper::body::to_bytes(req.into_body()).await?;
+
+	if let Some(content_sha256) = content_sha256 {
+		verify_signed_content(content_sha256, &body[..])?;
+	}
+
+	let body_xml = roxmltree::Document::parse(std::str::from_utf8(&body)?)?;
+	let body_list_of_parts = parse_complete_multipart_upload_body(&body_xml)
+		.ok_or_bad_request("Invalid CompleteMultipartUpload XML")?;
+	debug!(
+		"CompleteMultipartUpload list of parts: {:?}",
+		body_list_of_parts
+	);
+
+	let upload_id = decode_upload_id(upload_id)?;
+
+	// Get object and multipart upload
+	let key = key.to_string();
+	let (_, mut object_version, mpu) = get_upload(&garage, &bucket.id, &key, &upload_id).await?;
+
+	if mpu.parts.is_empty() {
+		return Err(Error::bad_request("No data was uploaded"));
+	}
+
+	let headers = match object_version.state {
+		ObjectVersionState::Uploading { headers, .. } => headers,
+		_ => unreachable!(),
+	};
+
+	// Check that part numbers are an increasing sequence.
+	// (it doesn't need to start at 1 nor to be a continuous sequence,
+	// see discussion in #192)
+	if body_list_of_parts.is_empty() {
+		return Err(Error::EntityTooSmall);
+	}
+	if !body_list_of_parts
+		.iter()
+		.zip(body_list_of_parts.iter().skip(1))
+		.all(|(p1, p2)| p1.part_number < p2.part_number)
+	{
+		return Err(Error::InvalidPartOrder);
+	}
+
+	// Check that the list of parts they gave us corresponds to parts we have here
+	debug!("Parts stored in multipart upload: {:?}", mpu.parts.items());
+	let mut have_parts = HashMap::new();
+	for (pk, pv) in mpu.parts.items().iter() {
+		have_parts.insert(pk.part_number, pv);
+	}
+	let mut parts = vec![];
+	for req_part in body_list_of_parts.iter() {
+		match have_parts.get(&req_part.part_number) {
+			Some(part) if part.etag.as_ref() == Some(&req_part.etag) && part.size.is_some() => {
+				parts.push(*part)
+			}
+			_ => return Err(Error::InvalidPart),
+		}
+	}
+
+	let grg = &garage;
+	let parts_versions = futures::future::try_join_all(parts.iter().map(|p| async move {
+		grg.version_table
+			.get(&p.version, &EmptyKey)
+			.await?
+			.ok_or_internal_error("Part version missing from version table")
+	}))
+	.await?;
+
+	// Create final version and block refs
+	let mut final_version = Version::new(
+		upload_id,
+		VersionBacklink::Object {
+			bucket_id: bucket.id,
+			key: key.to_string(),
+		},
+		false,
+	);
+	for (part_number, part_version) in parts_versions.iter().enumerate() {
+		if part_version.deleted.get() {
+			return Err(Error::InvalidPart);
+		}
+		for (vbk, vb) in part_version.blocks.items().iter() {
+			final_version.blocks.put(
+				VersionBlockKey {
+					part_number: (part_number + 1) as u64,
+					offset: vbk.offset,
+				},
+				*vb,
+			);
+		}
+	}
+	garage.version_table.insert(&final_version).await?;
+
+	let block_refs = final_version.blocks.items().iter().map(|(_, b)| BlockRef {
+		block: b.hash,
+		version: upload_id,
+		deleted: false.into(),
+	});
+	garage.block_ref_table.insert_many(block_refs).await?;
+
+	// Calculate etag of final object
+	// To understand how etags are calculated, read more here:
+	// https://teppen.io/2018/06/23/aws_s3_etags/
+	let mut etag_md5_hasher = Md5::new();
+	for part in parts.iter() {
+		etag_md5_hasher.update(part.etag.as_ref().unwrap().as_bytes());
+	}
+	let etag = format!(
+		"{}-{}",
+		hex::encode(etag_md5_hasher.finalize()),
+		parts.len()
+	);
+
+	// Calculate total size of final object
+	let total_size = parts.iter().map(|x| x.size.unwrap()).sum();
+
+	if let Err(e) = check_quotas(&garage, bucket, &key, total_size).await {
+		object_version.state = ObjectVersionState::Aborted;
+		let final_object = Object::new(bucket.id, key.clone(), vec![object_version]);
+		garage.object_table.insert(&final_object).await?;
+
+		return Err(e);
+	}
+
+	// Write final object version
+	object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
+		ObjectVersionMeta {
+			headers,
+			size: total_size,
+			etag: etag.clone(),
+		},
+		final_version.blocks.items()[0].1.hash,
+	));
+
+	let final_object = Object::new(bucket.id, key.clone(), vec![object_version]);
+	garage.object_table.insert(&final_object).await?;
+
+	// Send response saying ok we're done
+	let result = s3_xml::CompleteMultipartUploadResult {
+		xmlns: (),
+		location: None,
+		bucket: s3_xml::Value(bucket_name.to_string()),
+		key: s3_xml::Value(key),
+		etag: s3_xml::Value(format!("\"{}\"", etag)),
+	};
+	let xml = s3_xml::to_xml_with_header(&result)?;
+
+	Ok(Response::new(Body::from(xml.into_bytes())))
+}
+
+pub async fn handle_abort_multipart_upload(
+	garage: Arc<Garage>,
+	bucket_id: Uuid,
+	key: &str,
+	upload_id: &str,
+) -> Result<Response<Body>, Error> {
+	let upload_id = decode_upload_id(upload_id)?;
+
+	let (_, mut object_version, _) =
+		get_upload(&garage, &bucket_id, &key.to_string(), &upload_id).await?;
+
+	object_version.state = ObjectVersionState::Aborted;
+	let final_object = Object::new(bucket_id, key.to_string(), vec![object_version]);
+	garage.object_table.insert(&final_object).await?;
+
+	Ok(Response::new(Body::from(vec![])))
+}
+
+// ======== helpers ============
+
+#[allow(clippy::ptr_arg)]
+pub(crate) async fn get_upload(
+	garage: &Garage,
+	bucket_id: &Uuid,
+	key: &String,
+	upload_id: &Uuid,
+) -> Result<(Object, ObjectVersion, MultipartUpload), Error> {
+	let (object, mpu) = futures::try_join!(
+		garage.object_table.get(bucket_id, key).map_err(Error::from),
+		garage
+			.mpu_table
+			.get(upload_id, &EmptyKey)
+			.map_err(Error::from),
+	)?;
+
+	let object = object.ok_or(Error::NoSuchUpload)?;
+	let mpu = mpu.ok_or(Error::NoSuchUpload)?;
+
+	let object_version = object
+		.versions()
+		.iter()
+		.find(|v| v.uuid == *upload_id && v.is_uploading(Some(true)))
+		.ok_or(Error::NoSuchUpload)?
+		.clone();
+
+	Ok((object, object_version, mpu))
+}
+
+pub fn decode_upload_id(id: &str) -> Result<Uuid, Error> {
+	let id_bin = hex::decode(id).map_err(|_| Error::NoSuchUpload)?;
+	if id_bin.len() != 32 {
+		return Err(Error::NoSuchUpload);
+	}
+	let mut uuid = [0u8; 32];
+	uuid.copy_from_slice(&id_bin[..]);
+	Ok(Uuid::from(uuid))
+}
+
+#[derive(Debug)]
+struct CompleteMultipartUploadPart {
+	etag: String,
+	part_number: u64,
+}
+
+fn parse_complete_multipart_upload_body(
+	xml: &roxmltree::Document,
+) -> Option<Vec<CompleteMultipartUploadPart>> {
+	let mut parts = vec![];
+
+	let root = xml.root();
+	let cmu = root.first_child()?;
+	if !cmu.has_tag_name("CompleteMultipartUpload") {
+		return None;
+	}
+
+	for item in cmu.children() {
+		// Only parse <Part> nodes
+		if !item.is_element() {
+			continue;
+		}
+
+		if item.has_tag_name("Part") {
+			let etag = item.children().find(|e| e.has_tag_name("ETag"))?.text()?;
+			let part_number = item
+				.children()
+				.find(|e| e.has_tag_name("PartNumber"))?
+				.text()?;
+			parts.push(CompleteMultipartUploadPart {
+				etag: etag.trim_matches('"').to_string(),
+				part_number: part_number.parse().ok()?,
+			});
+		} else {
+			return None;
+		}
+	}
+
+	Some(parts)
+}
--- a/src/api/s3/put.rs
+++ b/src/api/s3/put.rs
@ -1,4 +1,4 @@
-use std::collections::{BTreeMap, BTreeSet, HashMap};
+use std::collections::{BTreeMap, HashMap};
 use std::sync::Arc;

 use base64::prelude::*;
@ -30,8 +30,6 @@ use garage_model::s3::object_table::*;
 use garage_model::s3::version_table::*;

 use crate::s3::error::*;
-use crate::s3::xml as s3_xml;
-use crate::signature::verify_signed_content;

 pub async fn handle_put(
 	garage: Arc<Garage>,
@ -123,20 +121,23 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	// The following consists in many steps that can each fail.
 	// Keep track that some cleanup will be needed if things fail
 	// before everything is finished (cleanup is done using the Drop trait).
-	let mut interrupted_cleanup = InterruptedCleanup(Some((
-		garage.clone(),
-		bucket.id,
-		key.into(),
+	let mut interrupted_cleanup = InterruptedCleanup(Some(InterruptedCleanupInner {
+		garage: garage.clone(),
+		bucket_id: bucket.id,
+		key: key.into(),
 		version_uuid,
 		version_timestamp,
-	)));
+	}));

 	// Write version identifier in object table so that we have a trace
 	// that we are uploading something
 	let mut object_version = ObjectVersion {
 		uuid: version_uuid,
 		timestamp: version_timestamp,
-		state: ObjectVersionState::Uploading(headers.clone()),
+		state: ObjectVersionState::Uploading {
+			headers: headers.clone(),
+			multipart: false,
+		},
 	};
 	let object = Object::new(bucket.id, key.into(), vec![object_version.clone()]);
 	garage.object_table.insert(&object).await?;
@ -145,7 +146,14 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	// Write this entry now, even with empty block list,
 	// to prevent block_ref entries from being deleted (they can be deleted
 	// if the reference a version that isn't found in the version table)
-	let version = Version::new(version_uuid, bucket.id, key.into(), false);
+	let version = Version::new(
+		version_uuid,
+		VersionBacklink::Object {
+			bucket_id: bucket.id,
+			key: key.into(),
+		},
+		false,
+	);
 	garage.version_table.insert(&version).await?;

 	// Transfer data and verify checksum
@ -192,7 +200,7 @@ pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(

 /// Validate MD5 sum against content-md5 header
 /// and sha256sum against signed content-sha256
-fn ensure_checksum_matches(
+pub(crate) fn ensure_checksum_matches(
 	data_md5sum: &[u8],
 	data_sha256sum: garage_util::data::FixedBytes32,
 	content_md5: Option<&str>,
@ -218,7 +226,7 @@ fn ensure_checksum_matches(
 }

 /// Check that inserting this object with this size doesn't exceed bucket quotas
-async fn check_quotas(
+pub(crate) async fn check_quotas(
 	garage: &Arc<Garage>,
 	bucket: &Bucket,
 	key: &str,
@ -275,7 +283,7 @@ async fn check_quotas(
 	Ok(())
 }

-async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
+pub(crate) async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
 	garage: &Garage,
 	version: &Version,
 	part_number: u64,
@ -381,7 +389,7 @@ async fn put_block_meta(
 	Ok(())
 }

-struct StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
+pub(crate) struct StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
 	stream: S,
 	read_all: bool,
 	block_size: usize,
@ -389,7 +397,7 @@ struct StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
 }

 impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
-	fn new(stream: S, block_size: usize) -> Self {
+	pub(crate) fn new(stream: S, block_size: usize) -> Self {
 		Self {
 			stream,
 			read_all: false,
@ -398,7 +406,7 @@ impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
 		}
 	}

-	async fn next(&mut self) -> Result<Option<Bytes>, Error> {
+	pub(crate) async fn next(&mut self) -> Result<Option<Bytes>, Error> {
 		while !self.read_all && self.buf.len() < self.block_size {
 			if let Some(block) = self.stream.next().await {
 				let bytes = block?;
@ -425,7 +433,14 @@ pub fn put_response(version_uuid: Uuid, md5sum_hex: String) -> Response<Body> {
 		.unwrap()
 }

-struct InterruptedCleanup(Option<(Arc<Garage>, Uuid, String, Uuid, u64)>);
+struct InterruptedCleanup(Option<InterruptedCleanupInner>);
+struct InterruptedCleanupInner {
+	garage: Arc<Garage>,
+	bucket_id: Uuid,
+	key: String,
+	version_uuid: Uuid,
+	version_timestamp: u64,
+}

 impl InterruptedCleanup {
 	fn cancel(&mut self) {
@ -434,15 +449,15 @@ impl InterruptedCleanup {
 }
 impl Drop for InterruptedCleanup {
 	fn drop(&mut self) {
-		if let Some((garage, bucket_id, key, version_uuid, version_ts)) = self.0.take() {
+		if let Some(info) = self.0.take() {
 			tokio::spawn(async move {
 				let object_version = ObjectVersion {
-					uuid: version_uuid,
-					timestamp: version_ts,
+					uuid: info.version_uuid,
+					timestamp: info.version_timestamp,
 					state: ObjectVersionState::Aborted,
 				};
-				let object = Object::new(bucket_id, key, vec![object_version]);
-				if let Err(e) = garage.object_table.insert(&object).await {
+				let object = Object::new(info.bucket_id, info.key, vec![object_version]);
+				if let Err(e) = info.garage.object_table.insert(&object).await {
 					warn!("Cannot cleanup after aborted PutObject: {}", e);
 				}
 			});
@ -450,326 +465,9 @@ impl Drop for InterruptedCleanup {
 	}
 }

-// ----
+// ============ helpers ============

-pub async fn handle_create_multipart_upload(
-	garage: Arc<Garage>,
-	req: &Request<Body>,
-	bucket_name: &str,
-	bucket_id: Uuid,
-	key: &str,
-) -> Result<Response<Body>, Error> {
-	let version_uuid = gen_uuid();
-	let headers = get_headers(req.headers())?;
-
-	// Create object in object table
-	let object_version = ObjectVersion {
-		uuid: version_uuid,
-		timestamp: now_msec(),
-		state: ObjectVersionState::Uploading(headers),
-	};
-	let object = Object::new(bucket_id, key.to_string(), vec![object_version]);
-	garage.object_table.insert(&object).await?;
-
-	// Insert empty version so that block_ref entries refer to something
-	// (they are inserted concurrently with blocks in the version table, so
-	// there is the possibility that they are inserted before the version table
-	// is created, in which case it is allowed to delete them, e.g. in repair_*)
-	let version = Version::new(version_uuid, bucket_id, key.into(), false);
-	garage.version_table.insert(&version).await?;
-
-	// Send success response
-	let result = s3_xml::InitiateMultipartUploadResult {
-		xmlns: (),
-		bucket: s3_xml::Value(bucket_name.to_string()),
-		key: s3_xml::Value(key.to_string()),
-		upload_id: s3_xml::Value(hex::encode(version_uuid)),
-	};
-	let xml = s3_xml::to_xml_with_header(&result)?;
-
-	Ok(Response::new(Body::from(xml.into_bytes())))
-}
-
-pub async fn handle_put_part(
-	garage: Arc<Garage>,
-	req: Request<Body>,
-	bucket_id: Uuid,
-	key: &str,
-	part_number: u64,
-	upload_id: &str,
-	content_sha256: Option<Hash>,
-) -> Result<Response<Body>, Error> {
-	let version_uuid = decode_upload_id(upload_id)?;
-
-	let content_md5 = match req.headers().get("content-md5") {
-		Some(x) => Some(x.to_str()?.to_string()),
-		None => None,
-	};
-
-	// Read first chuck, and at the same time try to get object to see if it exists
-	let key = key.to_string();
-
-	let body = req.into_body().map_err(Error::from);
-	let mut chunker = StreamChunker::new(body, garage.config.block_size);
-
-	let (object, version, first_block) = futures::try_join!(
-		garage
-			.object_table
-			.get(&bucket_id, &key)
-			.map_err(Error::from),
-		garage
-			.version_table
-			.get(&version_uuid, &EmptyKey)
-			.map_err(Error::from),
-		chunker.next(),
-	)?;
-
-	// Check object is valid and multipart block can be accepted
-	let first_block = first_block.ok_or_bad_request("Empty body")?;
-	let object = object.ok_or_bad_request("Object not found")?;
-
-	if !object
-		.versions()
-		.iter()
-		.any(|v| v.uuid == version_uuid && v.is_uploading())
-	{
-		return Err(Error::NoSuchUpload);
-	}
-
-	// Check part hasn't already been uploaded
-	if let Some(v) = version {
-		if v.has_part_number(part_number) {
-			return Err(Error::bad_request(format!(
-				"Part number {} has already been uploaded",
-				part_number
-			)));
-		}
-	}
-
-	// Copy block to store
-	let version = Version::new(version_uuid, bucket_id, key, false);
-
-	let first_block_hash = async_blake2sum(first_block.clone()).await;
-
-	let (_, data_md5sum, data_sha256sum) = read_and_put_blocks(
-		&garage,
-		&version,
-		part_number,
-		first_block,
-		first_block_hash,
-		&mut chunker,
-	)
-	.await?;
-
-	// Verify that checksums map
-	ensure_checksum_matches(
-		data_md5sum.as_slice(),
-		data_sha256sum,
-		content_md5.as_deref(),
-		content_sha256,
-	)?;
-
-	// Store part etag in version
-	let data_md5sum_hex = hex::encode(data_md5sum);
-	let mut version = version;
-	version
-		.parts_etags
-		.put(part_number, data_md5sum_hex.clone());
-	garage.version_table.insert(&version).await?;
-
-	let response = Response::builder()
-		.header("ETag", format!("\"{}\"", data_md5sum_hex))
-		.body(Body::empty())
-		.unwrap();
-	Ok(response)
-}
-
-pub async fn handle_complete_multipart_upload(
-	garage: Arc<Garage>,
-	req: Request<Body>,
-	bucket_name: &str,
-	bucket: &Bucket,
-	key: &str,
-	upload_id: &str,
-	content_sha256: Option<Hash>,
-) -> Result<Response<Body>, Error> {
-	let body = hyper::body::to_bytes(req.into_body()).await?;
-
-	if let Some(content_sha256) = content_sha256 {
-		verify_signed_content(content_sha256, &body[..])?;
-	}
-
-	let body_xml = roxmltree::Document::parse(std::str::from_utf8(&body)?)?;
-	let body_list_of_parts = parse_complete_multipart_upload_body(&body_xml)
-		.ok_or_bad_request("Invalid CompleteMultipartUpload XML")?;
-	debug!(
-		"CompleteMultipartUpload list of parts: {:?}",
-		body_list_of_parts
-	);
-
-	let version_uuid = decode_upload_id(upload_id)?;
-
-	// Get object and version
-	let key = key.to_string();
-	let (object, version) = futures::try_join!(
-		garage.object_table.get(&bucket.id, &key),
-		garage.version_table.get(&version_uuid, &EmptyKey),
-	)?;
-
-	let object = object.ok_or(Error::NoSuchKey)?;
-	let mut object_version = object
-		.versions()
-		.iter()
-		.find(|v| v.uuid == version_uuid && v.is_uploading())
-		.cloned()
-		.ok_or(Error::NoSuchUpload)?;
-
-	let version = version.ok_or(Error::NoSuchKey)?;
-	if version.blocks.is_empty() {
-		return Err(Error::bad_request("No data was uploaded"));
-	}
-
-	let headers = match object_version.state {
-		ObjectVersionState::Uploading(headers) => headers,
-		_ => unreachable!(),
-	};
-
-	// Check that part numbers are an increasing sequence.
-	// (it doesn't need to start at 1 nor to be a continuous sequence,
-	// see discussion in #192)
-	if body_list_of_parts.is_empty() {
-		return Err(Error::EntityTooSmall);
-	}
-	if !body_list_of_parts
-		.iter()
-		.zip(body_list_of_parts.iter().skip(1))
-		.all(|(p1, p2)| p1.part_number < p2.part_number)
-	{
-		return Err(Error::InvalidPartOrder);
-	}
-
-	// Garage-specific restriction, see #204: part numbers must be
-	// consecutive starting at 1
-	if body_list_of_parts[0].part_number != 1
-		|| !body_list_of_parts
-			.iter()
-			.zip(body_list_of_parts.iter().skip(1))
-			.all(|(p1, p2)| p1.part_number + 1 == p2.part_number)
-	{
-		return Err(Error::NotImplemented("Garage does not support completing a Multipart upload with non-consecutive part numbers. This is a restriction of Garage's data model, which might be fixed in a future release. See issue #204 for more information on this topic.".into()));
-	}
-
-	// Check that the list of parts they gave us corresponds to the parts we have here
-	debug!("Expected parts from request: {:?}", body_list_of_parts);
-	debug!("Parts stored in version: {:?}", version.parts_etags.items());
-	let parts = version
-		.parts_etags
-		.items()
-		.iter()
-		.map(|pair| (&pair.0, &pair.1));
-	let same_parts = body_list_of_parts
-		.iter()
-		.map(|x| (&x.part_number, &x.etag))
-		.eq(parts);
-	if !same_parts {
-		return Err(Error::InvalidPart);
-	}
-
-	// Check that all blocks belong to one of the parts
-	let block_parts = version
-		.blocks
-		.items()
-		.iter()
-		.map(|(bk, _)| bk.part_number)
-		.collect::<BTreeSet<_>>();
-	let same_parts = body_list_of_parts
-		.iter()
-		.map(|x| x.part_number)
-		.eq(block_parts.into_iter());
-	if !same_parts {
-		return Err(Error::bad_request(
-			"Part numbers in block list and part list do not match. This can happen if a part was partially uploaded. Please abort the multipart upload and try again."
-		));
-	}
-
-	// Calculate etag of final object
-	// To understand how etags are calculated, read more here:
-	// https://teppen.io/2018/06/23/aws_s3_etags/
-	let num_parts = body_list_of_parts.len();
-	let mut etag_md5_hasher = Md5::new();
-	for (_, etag) in version.parts_etags.items().iter() {
-		etag_md5_hasher.update(etag.as_bytes());
-	}
-	let etag = format!("{}-{}", hex::encode(etag_md5_hasher.finalize()), num_parts);
-
-	// Calculate total size of final object
-	let total_size = version.blocks.items().iter().map(|x| x.1.size).sum();
-
-	if let Err(e) = check_quotas(&garage, bucket, &key, total_size).await {
-		object_version.state = ObjectVersionState::Aborted;
-		let final_object = Object::new(bucket.id, key.clone(), vec![object_version]);
-		garage.object_table.insert(&final_object).await?;
-
-		return Err(e);
-	}
-
-	// Write final object version
-	object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
-		ObjectVersionMeta {
-			headers,
-			size: total_size,
-			etag: etag.clone(),
-		},
-		version.blocks.items()[0].1.hash,
-	));
-
-	let final_object = Object::new(bucket.id, key.clone(), vec![object_version]);
-	garage.object_table.insert(&final_object).await?;
-
-	// Send response saying ok we're done
-	let result = s3_xml::CompleteMultipartUploadResult {
-		xmlns: (),
-		location: None,
-		bucket: s3_xml::Value(bucket_name.to_string()),
-		key: s3_xml::Value(key),
-		etag: s3_xml::Value(format!("\"{}\"", etag)),
-	};
-	let xml = s3_xml::to_xml_with_header(&result)?;
-
-	Ok(Response::new(Body::from(xml.into_bytes())))
-}
-
-pub async fn handle_abort_multipart_upload(
-	garage: Arc<Garage>,
-	bucket_id: Uuid,
-	key: &str,
-	upload_id: &str,
-) -> Result<Response<Body>, Error> {
-	let version_uuid = decode_upload_id(upload_id)?;
-
-	let object = garage
-		.object_table
-		.get(&bucket_id, &key.to_string())
-		.await?;
-	let object = object.ok_or(Error::NoSuchKey)?;
-
-	let object_version = object
-		.versions()
-		.iter()
-		.find(|v| v.uuid == version_uuid && v.is_uploading());
-	let mut object_version = match object_version {
-		None => return Err(Error::NoSuchUpload),
-		Some(x) => x.clone(),
-	};
-
-	object_version.state = ObjectVersionState::Aborted;
-	let final_object = Object::new(bucket_id, key.to_string(), vec![object_version]);
-	garage.object_table.insert(&final_object).await?;
-
-	Ok(Response::new(Body::from(vec![])))
-}
-
-fn get_mime_type(headers: &HeaderMap<HeaderValue>) -> Result<String, Error> {
+pub(crate) fn get_mime_type(headers: &HeaderMap<HeaderValue>) -> Result<String, Error> {
 	Ok(headers
 		.get(hyper::header::CONTENT_TYPE)
 		.map(|x| x.to_str())
@ -821,54 +519,3 @@ pub(crate) fn get_headers(headers: &HeaderMap<HeaderValue>) -> Result<ObjectVers
 		other,
 	})
 }
-
-pub fn decode_upload_id(id: &str) -> Result<Uuid, Error> {
-	let id_bin = hex::decode(id).map_err(|_| Error::NoSuchUpload)?;
-	if id_bin.len() != 32 {
-		return Err(Error::NoSuchUpload);
-	}
-	let mut uuid = [0u8; 32];
-	uuid.copy_from_slice(&id_bin[..]);
-	Ok(Uuid::from(uuid))
-}
-
-#[derive(Debug)]
-struct CompleteMultipartUploadPart {
-	etag: String,
-	part_number: u64,
-}
-
-fn parse_complete_multipart_upload_body(
-	xml: &roxmltree::Document,
-) -> Option<Vec<CompleteMultipartUploadPart>> {
-	let mut parts = vec![];
-
-	let root = xml.root();
-	let cmu = root.first_child()?;
-	if !cmu.has_tag_name("CompleteMultipartUpload") {
-		return None;
-	}
-
-	for item in cmu.children() {
-		// Only parse <Part> nodes
-		if !item.is_element() {
-			continue;
-		}
-
-		if item.has_tag_name("Part") {
-			let etag = item.children().find(|e| e.has_tag_name("ETag"))?.text()?;
-			let part_number = item
-				.children()
-				.find(|e| e.has_tag_name("PartNumber"))?
-				.text()?;
-			parts.push(CompleteMultipartUploadPart {
-				etag: etag.trim_matches('"').to_string(),
-				part_number: part_number.parse().ok()?,
-			});
-		} else {
-			return None;
-		}
-	}
-
-	Some(parts)
-}
--- a/src/garage/admin/block.rs
+++ b/src/garage/admin/block.rs
@ -34,6 +34,7 @@ impl AdminRpcHandler {
 			.get_range(&hash, None, None, 10000, Default::default())
 			.await?;
 		let mut versions = vec![];
+		let mut uploads = vec![];
 		for br in block_refs {
 			if let Some(v) = self
 				.garage
@ -41,6 +42,11 @@ impl AdminRpcHandler {
 				.get(&br.version, &EmptyKey)
 				.await?
 			{
+				if let VersionBacklink::MultipartUpload { upload_id } = &v.backlink {
+					if let Some(u) = self.garage.mpu_table.get(upload_id, &EmptyKey).await? {
+						uploads.push(u);
+					}
+				}
 				versions.push(Ok(v));
 			} else {
 				versions.push(Err(br.version));
@ -50,6 +56,7 @@ impl AdminRpcHandler {
 			hash,
 			refcount,
 			versions,
+			uploads,
 		})
 	}

@ -93,6 +100,7 @@ impl AdminRpcHandler {
 		}

 		let mut obj_dels = 0;
+		let mut mpu_dels = 0;
 		let mut ver_dels = 0;

 		for hash in blocks {
@ -105,56 +113,80 @@ impl AdminRpcHandler {
 				.await?;

 			for br in block_refs {
-				let version = match self
+				if let Some(version) = self
 					.garage
 					.version_table
 					.get(&br.version, &EmptyKey)
 					.await?
 				{
-					Some(v) => v,
-					None => continue,
-				};
+					self.handle_block_purge_version_backlink(
+						&version,
+						&mut obj_dels,
+						&mut mpu_dels,
+					)
+					.await?;

-				if let Some(object) = self
-					.garage
-					.object_table
-					.get(&version.bucket_id, &version.key)
-					.await?
-				{
-					let ov = object.versions().iter().rev().find(|v| v.is_complete());
-					if let Some(ov) = ov {
-						if ov.uuid == br.version {
-							let del_uuid = gen_uuid();
-							let deleted_object = Object::new(
-								version.bucket_id,
-								version.key.clone(),
-								vec![ObjectVersion {
-									uuid: del_uuid,
-									timestamp: ov.timestamp + 1,
-									state: ObjectVersionState::Complete(
-										ObjectVersionData::DeleteMarker,
-									),
-								}],
-							);
-							self.garage.object_table.insert(&deleted_object).await?;
-							obj_dels += 1;
-						}
+					if !version.deleted.get() {
+						let deleted_version = Version::new(version.uuid, version.backlink, true);
+						self.garage.version_table.insert(&deleted_version).await?;
+						ver_dels += 1;
 					}
 				}
-
-				if !version.deleted.get() {
-					let deleted_version =
-						Version::new(version.uuid, version.bucket_id, version.key.clone(), true);
-					self.garage.version_table.insert(&deleted_version).await?;
-					ver_dels += 1;
-				}
 			}
 		}
+
 		Ok(AdminRpc::Ok(format!(
-			"{} blocks were purged: {} object deletion markers added, {} versions marked deleted",
+			"Purged {} blocks, {} versions, {} objects, {} multipart uploads",
 			blocks.len(),
+			ver_dels,
 			obj_dels,
-			ver_dels
+			mpu_dels,
 		)))
 	}
+
+	async fn handle_block_purge_version_backlink(
+		&self,
+		version: &Version,
+		obj_dels: &mut usize,
+		mpu_dels: &mut usize,
+	) -> Result<(), Error> {
+		let (bucket_id, key, ov_id) = match &version.backlink {
+			VersionBacklink::Object { bucket_id, key } => (*bucket_id, key.clone(), version.uuid),
+			VersionBacklink::MultipartUpload { upload_id } => {
+				if let Some(mut mpu) = self.garage.mpu_table.get(upload_id, &EmptyKey).await? {
+					if !mpu.deleted.get() {
+						mpu.parts.clear();
+						mpu.deleted.set();
+						self.garage.mpu_table.insert(&mpu).await?;
+						*mpu_dels += 1;
+					}
+					(mpu.bucket_id, mpu.key.clone(), *upload_id)
+				} else {
+					return Ok(());
+				}
+			}
+		};
+
+		if let Some(object) = self.garage.object_table.get(&bucket_id, &key).await? {
+			let ov = object.versions().iter().rev().find(|v| v.is_complete());
+			if let Some(ov) = ov {
+				if ov.uuid == ov_id {
+					let del_uuid = gen_uuid();
+					let deleted_object = Object::new(
+						bucket_id,
+						key,
+						vec![ObjectVersion {
+							uuid: del_uuid,
+							timestamp: ov.timestamp + 1,
+							state: ObjectVersionState::Complete(ObjectVersionData::DeleteMarker),
+						}],
+					);
+					self.garage.object_table.insert(&deleted_object).await?;
+					*obj_dels += 1;
+				}
+			}
+		}
+
+		Ok(())
+	}
 }
--- a/src/garage/admin/bucket.rs
+++ b/src/garage/admin/bucket.rs
@ -73,6 +73,15 @@ impl AdminRpcHandler {
 			.map(|x| x.filtered_values(&self.garage.system.ring.borrow()))
 			.unwrap_or_default();

+		let mpu_counters = self
+			.garage
+			.mpu_counter_table
+			.table
+			.get(&bucket_id, &EmptyKey)
+			.await?
+			.map(|x| x.filtered_values(&self.garage.system.ring.borrow()))
+			.unwrap_or_default();
+
 		let mut relevant_keys = HashMap::new();
 		for (k, _) in bucket
 			.state
@ -112,6 +121,7 @@ impl AdminRpcHandler {
 			bucket,
 			relevant_keys,
 			counters,
+			mpu_counters,
 		})
 	}

--- a/src/garage/admin/mod.rs
+++ b/src/garage/admin/mod.rs
@ -27,6 +27,7 @@ use garage_model::garage::Garage;
 use garage_model::helper::error::{Error, OkOrBadRequest};
 use garage_model::key_table::*;
 use garage_model::migrate::Migrate;
+use garage_model::s3::mpu_table::MultipartUpload;
 use garage_model::s3::version_table::Version;

 use crate::cli::*;
@ -52,6 +53,7 @@ pub enum AdminRpc {
 		bucket: Bucket,
 		relevant_keys: HashMap<String, Key>,
 		counters: HashMap<String, i64>,
+		mpu_counters: HashMap<String, i64>,
 	},
 	KeyList(Vec<(String, String)>),
 	KeyInfo(Key, HashMap<Uuid, Bucket>),
@ -66,6 +68,7 @@ pub enum AdminRpc {
 		hash: Hash,
 		refcount: u64,
 		versions: Vec<Result<Version, Uuid>>,
+		uploads: Vec<MultipartUpload>,
 	},
 }

--- a/src/garage/cli/cmd.rs
+++ b/src/garage/cli/cmd.rs
@ -190,8 +190,9 @@ pub async fn cmd_admin(
 			bucket,
 			relevant_keys,
 			counters,
+			mpu_counters,
 		} => {
-			print_bucket_info(&bucket, &relevant_keys, &counters);
+			print_bucket_info(&bucket, &relevant_keys, &counters, &mpu_counters);
 		}
 		AdminRpc::KeyList(kl) => {
 			print_key_list(kl);
@ -215,8 +216,9 @@ pub async fn cmd_admin(
 			hash,
 			refcount,
 			versions,
+			uploads,
 		} => {
-			print_block_info(hash, refcount, versions);
+			print_block_info(hash, refcount, versions, uploads);
 		}
 		r => {
 			error!("Unexpected response: {:?}", r);
--- a/src/garage/cli/structs.rs
+++ b/src/garage/cli/structs.rs
@ -443,19 +443,22 @@ pub struct RepairOpt {

 #[derive(Serialize, Deserialize, StructOpt, Debug, Eq, PartialEq, Clone)]
 pub enum RepairWhat {
-	/// Only do a full sync of metadata tables
+	/// Do a full sync of metadata tables
 	#[structopt(name = "tables", version = garage_version())]
 	Tables,
-	/// Only repair (resync/rebalance) the set of stored blocks
+	/// Repair (resync/rebalance) the set of stored blocks
 	#[structopt(name = "blocks", version = garage_version())]
 	Blocks,
-	/// Only redo the propagation of object deletions to the version table (slow)
+	/// Repropagate object deletions to the version table
 	#[structopt(name = "versions", version = garage_version())]
 	Versions,
-	/// Only redo the propagation of version deletions to the block ref table (extremely slow)
+	/// Repropagate object deletions to the multipart upload table
+	#[structopt(name = "mpu", version = garage_version())]
+	MultipartUploads,
+	/// Repropagate version deletions to the block ref table
 	#[structopt(name = "block_refs", version = garage_version())]
 	BlockRefs,
-	/// Verify integrity of all blocks on disc (extremely slow, i/o intensive)
+	/// Verify integrity of all blocks on disc
 	#[structopt(name = "scrub", version = garage_version())]
 	Scrub {
 		#[structopt(subcommand)]
--- a/src/garage/cli/util.rs
+++ b/src/garage/cli/util.rs
@ -12,8 +12,9 @@ use garage_block::manager::BlockResyncErrorInfo;

 use garage_model::bucket_table::*;
 use garage_model::key_table::*;
-use garage_model::s3::object_table::{BYTES, OBJECTS, UNFINISHED_UPLOADS};
-use garage_model::s3::version_table::Version;
+use garage_model::s3::mpu_table::{self, MultipartUpload};
+use garage_model::s3::object_table;
+use garage_model::s3::version_table::*;

 use crate::cli::structs::WorkerListOpt;

@ -135,6 +136,7 @@ pub fn print_bucket_info(
 	bucket: &Bucket,
 	relevant_keys: &HashMap<String, Key>,
 	counters: &HashMap<String, i64>,
+	mpu_counters: &HashMap<String, i64>,
 ) {
 	let key_name = |k| {
 		relevant_keys
@ -148,7 +150,7 @@ pub fn print_bucket_info(
 		Deletable::Deleted => println!("Bucket is deleted."),
 		Deletable::Present(p) => {
 			let size =
-				bytesize::ByteSize::b(counters.get(BYTES).cloned().unwrap_or_default() as u64);
+				bytesize::ByteSize::b(*counters.get(object_table::BYTES).unwrap_or(&0) as u64);
 			println!(
 				"\nSize: {} ({})",
 				size.to_string_as(true),
@ -156,14 +158,22 @@ pub fn print_bucket_info(
 			);
 			println!(
 				"Objects: {}",
-				counters.get(OBJECTS).cloned().unwrap_or_default()
+				*counters.get(object_table::OBJECTS).unwrap_or(&0)
+			);
+			println!(
+				"Unfinished uploads (multipart and non-multipart): {}",
+				*counters.get(object_table::UNFINISHED_UPLOADS).unwrap_or(&0)
 			);
 			println!(
 				"Unfinished multipart uploads: {}",
-				counters
-					.get(UNFINISHED_UPLOADS)
-					.cloned()
-					.unwrap_or_default()
+				*mpu_counters.get(mpu_table::UPLOADS).unwrap_or(&0)
+			);
+			let mpu_size =
+				bytesize::ByteSize::b(*mpu_counters.get(mpu_table::BYTES).unwrap_or(&0) as u64);
+			println!(
+				"Size of unfinished multipart uploads: {} ({})",
+				mpu_size.to_string_as(true),
+				mpu_size.to_string_as(false),
 			);

 			println!("\nWebsite access: {}", p.website_config.get().is_some());
@ -385,29 +395,49 @@ pub fn print_block_error_list(el: Vec<BlockResyncErrorInfo>) {
 	format_table(table);
 }

-pub fn print_block_info(hash: Hash, refcount: u64, versions: Vec<Result<Version, Uuid>>) {
+pub fn print_block_info(
+	hash: Hash,
+	refcount: u64,
+	versions: Vec<Result<Version, Uuid>>,
+	uploads: Vec<MultipartUpload>,
+) {
 	println!("Block hash: {}", hex::encode(hash.as_slice()));
 	println!("Refcount: {}", refcount);
 	println!();

-	let mut table = vec!["Version\tBucket\tKey\tDeleted".into()];
+	let mut table = vec!["Version\tBucket\tKey\tMPU\tDeleted".into()];
 	let mut nondeleted_count = 0;
 	for v in versions.iter() {
 		match v {
 			Ok(ver) => {
-				table.push(format!(
-					"{:?}\t{:?}\t{}\t{:?}",
-					ver.uuid,
-					ver.bucket_id,
-					ver.key,
-					ver.deleted.get()
-				));
+				match &ver.backlink {
+					VersionBacklink::Object { bucket_id, key } => {
+						table.push(format!(
+							"{:?}\t{:?}\t{}\t\t{:?}",
+							ver.uuid,
+							bucket_id,
+							key,
+							ver.deleted.get()
+						));
+					}
+					VersionBacklink::MultipartUpload { upload_id } => {
+						let upload = uploads.iter().find(|x| x.upload_id == *upload_id);
+						table.push(format!(
+							"{:?}\t{:?}\t{}\t{:?}\t{:?}",
+							ver.uuid,
+							upload.map(|u| u.bucket_id).unwrap_or_default(),
+							upload.map(|u| u.key.as_str()).unwrap_or_default(),
+							upload_id,
+							ver.deleted.get()
+						));
+					}
+				}
 				if !ver.deleted.get() {
 					nondeleted_count += 1;
 				}
 			}
 			Err(vh) => {
-				table.push(format!("{:?}\t\t\tyes", vh));
+				table.push(format!("{:?}\t\t\t\tyes", vh));
 			}
 		}
 	}
--- a/src/garage/repair/online.rs
+++ b/src/garage/repair/online.rs
@ -5,11 +5,16 @@ use async_trait::async_trait;
 use tokio::sync::watch;

 use garage_block::repair::ScrubWorkerCommand;
+
 use garage_model::garage::Garage;
 use garage_model::s3::block_ref_table::*;
+use garage_model::s3::mpu_table::*;
 use garage_model::s3::object_table::*;
 use garage_model::s3::version_table::*;
+
+use garage_table::replication::*;
 use garage_table::*;
+
 use garage_util::background::*;
 use garage_util::error::Error;
 use garage_util::migrate::Migrate;
@ -32,11 +37,15 @@ pub async fn launch_online_repair(
 		}
 		RepairWhat::Versions => {
 			info!("Repairing the versions table");
-			bg.spawn_worker(RepairVersionsWorker::new(garage.clone()));
+			bg.spawn_worker(TableRepairWorker::new(garage.clone(), RepairVersions));
+		}
+		RepairWhat::MultipartUploads => {
+			info!("Repairing the multipart uploads table");
+			bg.spawn_worker(TableRepairWorker::new(garage.clone(), RepairMpu));
 		}
 		RepairWhat::BlockRefs => {
 			info!("Repairing the block refs table");
-			bg.spawn_worker(RepairBlockrefsWorker::new(garage.clone()));
+			bg.spawn_worker(TableRepairWorker::new(garage.clone(), RepairBlockRefs));
 		}
 		RepairWhat::Blocks => {
 			info!("Repairing the stored blocks");
@ -67,70 +76,70 @@ pub async fn launch_online_repair(

 // ----

-struct RepairVersionsWorker {
+#[async_trait]
+trait TableRepair: Send + Sync + 'static {
+	type T: TableSchema;
+
+	fn table(garage: &Garage) -> &Table<Self::T, TableShardedReplication>;
+
+	async fn process(
+		&mut self,
+		garage: &Garage,
+		entry: <<Self as TableRepair>::T as TableSchema>::E,
+	) -> Result<bool, Error>;
+}
+
+struct TableRepairWorker<T: TableRepair> {
 	garage: Arc<Garage>,
 	pos: Vec<u8>,
 	counter: usize,
+	repairs: usize,
+	inner: T,
 }

-impl RepairVersionsWorker {
-	fn new(garage: Arc<Garage>) -> Self {
+impl<R: TableRepair> TableRepairWorker<R> {
+	fn new(garage: Arc<Garage>, inner: R) -> Self {
 		Self {
 			garage,
+			inner,
 			pos: vec![],
 			counter: 0,
+			repairs: 0,
 		}
 	}
 }

 #[async_trait]
-impl Worker for RepairVersionsWorker {
+impl<R: TableRepair> Worker for TableRepairWorker<R> {
 	fn name(&self) -> String {
-		"Version repair worker".into()
+		format!("{} repair worker", R::T::TABLE_NAME)
 	}

 	fn status(&self) -> WorkerStatus {
 		WorkerStatus {
-			progress: Some(self.counter.to_string()),
+			progress: Some(format!("{} ({})", self.counter, self.repairs)),
 			..Default::default()
 		}
 	}

 	async fn work(&mut self, _must_exit: &mut watch::Receiver<bool>) -> Result<WorkerState, Error> {
-		let (item_bytes, next_pos) = match self.garage.version_table.data.store.get_gt(&self.pos)? {
+		let (item_bytes, next_pos) = match R::table(&self.garage).data.store.get_gt(&self.pos)? {
 			Some((k, v)) => (v, k),
 			None => {
-				info!("repair_versions: finished, done {}", self.counter);
+				info!(
+					"{}: finished, done {}, fixed {}",
+					self.name(),
+					self.counter,
+					self.repairs
+				);
 				return Ok(WorkerState::Done);
 			}
 		};

-		let version = Version::decode(&item_bytes).ok_or_message("Cannot decode Version")?;
-		if !version.deleted.get() {
-			let object = self
-				.garage
-				.object_table
-				.get(&version.bucket_id, &version.key)
-				.await?;
-			let version_exists = match object {
-				Some(o) => o
-					.versions()
-					.iter()
-					.any(|x| x.uuid == version.uuid && x.state != ObjectVersionState::Aborted),
-				None => false,
-			};
-			if !version_exists {
-				info!("Repair versions: marking version as deleted: {:?}", version);
-				self.garage
-					.version_table
-					.insert(&Version::new(
-						version.uuid,
-						version.bucket_id,
-						version.key,
-						true,
-					))
-					.await?;
-			}
+		let entry = <R::T as TableSchema>::E::decode(&item_bytes)
+			.ok_or_message("Cannot decode table entry")?;
+		if self.inner.process(&self.garage, entry).await? {
+			self.repairs += 1;
 		}

 		self.counter += 1;
@ -146,77 +155,124 @@ impl Worker for RepairVersionsWorker {

 // ----

-struct RepairBlockrefsWorker {
-	garage: Arc<Garage>,
-	pos: Vec<u8>,
-	counter: usize,
-}
-
-impl RepairBlockrefsWorker {
-	fn new(garage: Arc<Garage>) -> Self {
-		Self {
-			garage,
-			pos: vec![],
-			counter: 0,
-		}
-	}
-}
+struct RepairVersions;

 #[async_trait]
-impl Worker for RepairBlockrefsWorker {
-	fn name(&self) -> String {
-		"Block refs repair worker".into()
+impl TableRepair for RepairVersions {
+	type T = VersionTable;
+
+	fn table(garage: &Garage) -> &Table<Self::T, TableShardedReplication> {
+		&garage.version_table
 	}

-	fn status(&self) -> WorkerStatus {
-		WorkerStatus {
-			progress: Some(self.counter.to_string()),
-			..Default::default()
-		}
-	}
-
-	async fn work(&mut self, _must_exit: &mut watch::Receiver<bool>) -> Result<WorkerState, Error> {
-		let (item_bytes, next_pos) =
-			match self.garage.block_ref_table.data.store.get_gt(&self.pos)? {
-				Some((k, v)) => (v, k),
-				None => {
-					info!("repair_block_ref: finished, done {}", self.counter);
-					return Ok(WorkerState::Done);
-				}
+	async fn process(&mut self, garage: &Garage, version: Version) -> Result<bool, Error> {
+		if !version.deleted.get() {
+			let ref_exists = match &version.backlink {
+				VersionBacklink::Object { bucket_id, key } => garage
+					.object_table
+					.get(bucket_id, key)
+					.await?
+					.map(|o| {
+						o.versions().iter().any(|x| {
+							x.uuid == version.uuid && x.state != ObjectVersionState::Aborted
+						})
+					})
+					.unwrap_or(false),
+				VersionBacklink::MultipartUpload { upload_id } => garage
+					.mpu_table
+					.get(upload_id, &EmptyKey)
+					.await?
+					.map(|u| !u.deleted.get())
+					.unwrap_or(false),
 			};

-		let block_ref = BlockRef::decode(&item_bytes).ok_or_message("Cannot decode BlockRef")?;
+			if !ref_exists {
+				info!("Repair versions: marking version as deleted: {:?}", version);
+				garage
+					.version_table
+					.insert(&Version::new(version.uuid, version.backlink, true))
+					.await?;
+				return Ok(true);
+			}
+		}
+
+		Ok(false)
+	}
+}
+
+// ----
+
+struct RepairBlockRefs;
+
+#[async_trait]
+impl TableRepair for RepairBlockRefs {
+	type T = BlockRefTable;
+
+	fn table(garage: &Garage) -> &Table<Self::T, TableShardedReplication> {
+		&garage.block_ref_table
+	}
+
+	async fn process(&mut self, garage: &Garage, mut block_ref: BlockRef) -> Result<bool, Error> {
 		if !block_ref.deleted.get() {
-			let version = self
-				.garage
+			let ref_exists = garage
 				.version_table
 				.get(&block_ref.version, &EmptyKey)
-				.await?;
-			// The version might not exist if it has been GC'ed
-			let ref_exists = version.map(|v| !v.deleted.get()).unwrap_or(false);
+				.await?
+				.map(|v| !v.deleted.get())
+				.unwrap_or(false);
+
 			if !ref_exists {
 				info!(
 					"Repair block ref: marking block_ref as deleted: {:?}",
 					block_ref
 				);
-				self.garage
-					.block_ref_table
-					.insert(&BlockRef {
-						block: block_ref.block,
-						version: block_ref.version,
-						deleted: true.into(),
-					})
-					.await?;
+				block_ref.deleted.set();
+				garage.block_ref_table.insert(&block_ref).await?;
+				return Ok(true);
 			}
 		}

-		self.counter += 1;
-		self.pos = next_pos;
-
-		Ok(WorkerState::Busy)
-	}
-
-	async fn wait_for_work(&mut self) -> WorkerState {
-		unreachable!()
+		Ok(false)
+	}
+}
+
+// ----
+
+struct RepairMpu;
+
+#[async_trait]
+impl TableRepair for RepairMpu {
+	type T = MultipartUploadTable;
+
+	fn table(garage: &Garage) -> &Table<Self::T, TableShardedReplication> {
+		&garage.mpu_table
+	}
+
+	async fn process(&mut self, garage: &Garage, mut mpu: MultipartUpload) -> Result<bool, Error> {
+		if !mpu.deleted.get() {
+			let ref_exists = garage
+				.object_table
+				.get(&mpu.bucket_id, &mpu.key)
+				.await?
+				.map(|o| {
+					o.versions()
+						.iter()
+						.any(|x| x.uuid == mpu.upload_id && x.is_uploading(Some(true)))
+				})
+				.unwrap_or(false);
+
+			if !ref_exists {
+				info!(
+					"Repair multipart uploads: marking mpu as deleted: {:?}",
+					mpu
+				);
+				mpu.parts.clear();
+				mpu.deleted.set();
+				garage.mpu_table.insert(&mpu).await?;
+				return Ok(true);
+			}
+		}
+
+		Ok(false)
 	}
 }
--- a/src/garage/tests/s3/multipart.rs
+++ b/src/garage/tests/s3/multipart.rs
@ -5,6 +5,190 @@ use aws_sdk_s3::types::ByteStream;
 const SZ_5MB: usize = 5 * 1024 * 1024;
 const SZ_10MB: usize = 10 * 1024 * 1024;

+#[tokio::test]
+async fn test_multipart_upload() {
+	let ctx = common::context();
+	let bucket = ctx.create_bucket("testmpu");
+
+	let u1 = vec![0x11; SZ_5MB];
+	let u2 = vec![0x22; SZ_5MB];
+	let u3 = vec![0x33; SZ_5MB];
+	let u4 = vec![0x44; SZ_5MB];
+	let u5 = vec![0x55; SZ_5MB];
+
+	let up = ctx
+		.client
+		.create_multipart_upload()
+		.bucket(&bucket)
+		.key("a")
+		.send()
+		.await
+		.unwrap();
+	assert!(up.upload_id.is_some());
+
+	let uid = up.upload_id.as_ref().unwrap();
+
+	let p3 = ctx
+		.client
+		.upload_part()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.part_number(3)
+		.body(ByteStream::from(u3.clone()))
+		.send()
+		.await
+		.unwrap();
+
+	let _p1 = ctx
+		.client
+		.upload_part()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.part_number(1)
+		.body(ByteStream::from(u1))
+		.send()
+		.await
+		.unwrap();
+
+	let _p4 = ctx
+		.client
+		.upload_part()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.part_number(4)
+		.body(ByteStream::from(u4))
+		.send()
+		.await
+		.unwrap();
+
+	let p1bis = ctx
+		.client
+		.upload_part()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.part_number(1)
+		.body(ByteStream::from(u2.clone()))
+		.send()
+		.await
+		.unwrap();
+
+	let p6 = ctx
+		.client
+		.upload_part()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.part_number(6)
+		.body(ByteStream::from(u5.clone()))
+		.send()
+		.await
+		.unwrap();
+
+	{
+		let r = ctx
+			.client
+			.list_parts()
+			.bucket(&bucket)
+			.key("a")
+			.upload_id(uid)
+			.send()
+			.await
+			.unwrap();
+		assert_eq!(r.parts.unwrap().len(), 4);
+	}
+
+	let cmp = CompletedMultipartUpload::builder()
+		.parts(
+			CompletedPart::builder()
+				.part_number(1)
+				.e_tag(p1bis.e_tag.unwrap())
+				.build(),
+		)
+		.parts(
+			CompletedPart::builder()
+				.part_number(3)
+				.e_tag(p3.e_tag.unwrap())
+				.build(),
+		)
+		.parts(
+			CompletedPart::builder()
+				.part_number(6)
+				.e_tag(p6.e_tag.unwrap())
+				.build(),
+		)
+		.build();
+
+	ctx.client
+		.complete_multipart_upload()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.multipart_upload(cmp)
+		.send()
+		.await
+		.unwrap();
+
+	// The multipart upload must not appear anymore
+	assert!(ctx
+		.client
+		.list_parts()
+		.bucket(&bucket)
+		.key("a")
+		.upload_id(uid)
+		.send()
+		.await
+		.is_err());
+
+	{
+		// The object must appear as a regular object
+		let r = ctx
+			.client
+			.head_object()
+			.bucket(&bucket)
+			.key("a")
+			.send()
+			.await
+			.unwrap();
+
+		assert_eq!(r.content_length, (SZ_5MB * 3) as i64);
+	}
+
+	{
+		let o = ctx
+			.client
+			.get_object()
+			.bucket(&bucket)
+			.key("a")
+			.send()
+			.await
+			.unwrap();
+
+		assert_bytes_eq!(o.body, &[&u2[..], &u3[..], &u5[..]].concat());
+	}
+
+	{
+		for (part_number, data) in [(1, &u2), (2, &u3), (3, &u5)] {
+			let o = ctx
+				.client
+				.get_object()
+				.bucket(&bucket)
+				.key("a")
+				.part_number(part_number)
+				.send()
+				.await
+				.unwrap();
+
+			eprintln!("get_object with part_number = {}", part_number);
+			assert_eq!(o.content_length, SZ_5MB as i64);
+			assert_bytes_eq!(o.body, data);
+		}
+	}
+}
+
 #[tokio::test]
 async fn test_uploadlistpart() {
 	let ctx = common::context();
@ -65,7 +249,8 @@ async fn test_uploadlistpart() {

 		let ps = r.parts.unwrap();
 		assert_eq!(ps.len(), 1);
-		let fp = ps.iter().find(|x| x.part_number == 2).unwrap();
+		assert_eq!(ps[0].part_number, 2);
+		let fp = &ps[0];
 		assert!(fp.last_modified.is_some());
 		assert_eq!(
 			fp.e_tag.as_ref().unwrap(),
@ -100,13 +285,24 @@ async fn test_uploadlistpart() {

 		let ps = r.parts.unwrap();
 		assert_eq!(ps.len(), 2);
-		let fp = ps.iter().find(|x| x.part_number == 1).unwrap();
+
+		assert_eq!(ps[0].part_number, 1);
+		let fp = &ps[0];
 		assert!(fp.last_modified.is_some());
 		assert_eq!(
 			fp.e_tag.as_ref().unwrap(),
 			"\"3c484266f9315485694556e6c693bfa2\""
 		);
 		assert_eq!(fp.size, SZ_5MB as i64);
+
+		assert_eq!(ps[1].part_number, 2);
+		let sp = &ps[1];
+		assert!(sp.last_modified.is_some());
+		assert_eq!(
+			sp.e_tag.as_ref().unwrap(),
+			"\"3366bb9dcf710d6801b5926467d02e19\""
+		);
+		assert_eq!(sp.size, SZ_5MB as i64);
 	}

 	{
@ -123,12 +319,19 @@ async fn test_uploadlistpart() {
 			.unwrap();

 		assert!(r.part_number_marker.is_none());
-		assert!(r.next_part_number_marker.is_some());
+		assert_eq!(r.next_part_number_marker.as_deref(), Some("1"));
 		assert_eq!(r.max_parts, 1_i32);
 		assert!(r.is_truncated);
 		assert_eq!(r.key.unwrap(), "a");
 		assert_eq!(r.upload_id.unwrap().as_str(), uid.as_str());
-		assert_eq!(r.parts.unwrap().len(), 1);
+		let parts = r.parts.unwrap();
+		assert_eq!(parts.len(), 1);
+		let fp = &parts[0];
+		assert_eq!(fp.part_number, 1);
+		assert_eq!(
+			fp.e_tag.as_ref().unwrap(),
+			"\"3c484266f9315485694556e6c693bfa2\""
+		);

 		let r2 = ctx
 			.client
@ -147,10 +350,18 @@ async fn test_uploadlistpart() {
 			r.next_part_number_marker.as_ref().unwrap()
 		);
 		assert_eq!(r2.max_parts, 1_i32);
-		assert!(r2.is_truncated);
 		assert_eq!(r2.key.unwrap(), "a");
 		assert_eq!(r2.upload_id.unwrap().as_str(), uid.as_str());
-		assert_eq!(r2.parts.unwrap().len(), 1);
+		let parts = r2.parts.unwrap();
+		assert_eq!(parts.len(), 1);
+		let fp = &parts[0];
+		assert_eq!(fp.part_number, 2);
+		assert_eq!(
+			fp.e_tag.as_ref().unwrap(),
+			"\"3366bb9dcf710d6801b5926467d02e19\""
+		);
+		//assert!(r2.is_truncated);   // WHY? (this was the test before)
+		assert!(!r2.is_truncated);
 	}

 	let cmp = CompletedMultipartUpload::builder()
--- a/src/model/garage.rs
+++ b/src/model/garage.rs
@ -17,6 +17,7 @@ use garage_table::replication::TableShardedReplication;
 use garage_table::*;

 use crate::s3::block_ref_table::*;
+use crate::s3::mpu_table::*;
 use crate::s3::object_table::*;
 use crate::s3::version_table::*;

@ -57,6 +58,10 @@ pub struct Garage {
 	pub object_table: Arc<Table<ObjectTable, TableShardedReplication>>,
 	/// Counting table containing object counters
 	pub object_counter_table: Arc<IndexCounter<Object>>,
+	/// Table containing S3 multipart uploads
+	pub mpu_table: Arc<Table<MultipartUploadTable, TableShardedReplication>>,
+	/// Counting table containing multipart object counters
+	pub mpu_counter_table: Arc<IndexCounter<MultipartUpload>>,
 	/// Table containing S3 object versions
 	pub version_table: Arc<Table<VersionTable, TableShardedReplication>>,
 	/// Table containing S3 block references (not blocks themselves)
@ -261,6 +266,20 @@ impl Garage {
 			&db,
 		);

+		info!("Initialize multipart upload counter table...");
+		let mpu_counter_table = IndexCounter::new(system.clone(), meta_rep_param.clone(), &db);
+
+		info!("Initialize multipart upload table...");
+		let mpu_table = Table::new(
+			MultipartUploadTable {
+				version_table: version_table.clone(),
+				mpu_counter_table: mpu_counter_table.clone(),
+			},
+			meta_rep_param.clone(),
+			system.clone(),
+			&db,
+		);
+
 		info!("Initialize object counter table...");
 		let object_counter_table = IndexCounter::new(system.clone(), meta_rep_param.clone(), &db);

@ -269,6 +288,7 @@ impl Garage {
 		let object_table = Table::new(
 			ObjectTable {
 				version_table: version_table.clone(),
+				mpu_table: mpu_table.clone(),
 				object_counter_table: object_counter_table.clone(),
 			},
 			meta_rep_param.clone(),
@ -297,6 +317,8 @@ impl Garage {
 			key_table,
 			object_table,
 			object_counter_table,
+			mpu_table,
+			mpu_counter_table,
 			version_table,
 			block_ref_table,
 			#[cfg(feature = "k2v")]
@ -313,6 +335,8 @@ impl Garage {

 		self.object_table.spawn_workers(bg);
 		self.object_counter_table.spawn_workers(bg);
+		self.mpu_table.spawn_workers(bg);
+		self.mpu_counter_table.spawn_workers(bg);
 		self.version_table.spawn_workers(bg);
 		self.block_ref_table.spawn_workers(bg);

--- a/src/model/helper/bucket.rs
+++ b/src/model/helper/bucket.rs
@ -478,7 +478,9 @@ impl<'a> BucketHelper<'a> {
 	// ----

 	/// Deletes all incomplete multipart uploads that are older than a certain time.
-	/// Returns the number of uploads aborted
+	/// Returns the number of uploads aborted.
+	/// This will also include non-multipart uploads, which may be lingering
+	/// after a node crash
 	pub async fn cleanup_incomplete_uploads(
 		&self,
 		bucket_id: &Uuid,
@ -496,7 +498,9 @@ impl<'a> BucketHelper<'a> {
 				.get_range(
 					bucket_id,
 					start,
-					Some(ObjectFilter::IsUploading),
+					Some(ObjectFilter::IsUploading {
+						check_multipart: None,
+					}),
 					1000,
 					EnumerationOrder::Forward,
 				)
@ -508,7 +512,7 @@ impl<'a> BucketHelper<'a> {
 					let aborted_versions = object
 						.versions()
 						.iter()
-						.filter(|v| v.is_uploading() && v.timestamp < older_than)
+						.filter(|v| v.is_uploading(None) && v.timestamp < older_than)
 						.map(|v| ObjectVersion {
 							state: ObjectVersionState::Aborted,
 							uuid: v.uuid,
--- a/src/model/s3/mod.rs
+++ b/src/model/s3/mod.rs
@ -1,3 +1,4 @@
 pub mod block_ref_table;
+pub mod mpu_table;
 pub mod object_table;
 pub mod version_table;
--- a/src/model/s3/mpu_table.rs
+++ b/src/model/s3/mpu_table.rs
@ -0,0 +1,245 @@
+use std::sync::Arc;
+
+use garage_db as db;
+
+use garage_util::crdt::Crdt;
+use garage_util::data::*;
+use garage_util::time::*;
+
+use garage_table::replication::TableShardedReplication;
+use garage_table::*;
+
+use crate::index_counter::*;
+use crate::s3::version_table::*;
+
+pub const UPLOADS: &str = "uploads";
+pub const PARTS: &str = "parts";
+pub const BYTES: &str = "bytes";
+
+mod v09 {
+	use garage_util::crdt;
+	use garage_util::data::Uuid;
+	use serde::{Deserialize, Serialize};
+
+	/// A part of a multipart upload
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub struct MultipartUpload {
+		/// Partition key = Upload id = UUID of the object version
+		pub upload_id: Uuid,
+
+		/// Is this multipart upload deleted
+		/// The MultipartUpload is marked as deleted as soon as the
+		/// multipart upload is either completed or aborted
+		pub deleted: crdt::Bool,
+		/// List of uploaded parts, key = (part number, timestamp)
+		/// In case of retries, all versions for each part are kept
+		/// Everything is cleaned up only once the MultipartUpload is marked deleted
+		pub parts: crdt::Map<MpuPartKey, MpuPart>,
+
+		// Back link to bucket+key so that we can find the object this mpu
+		// belongs to and check whether it is still valid
+		/// Bucket in which the related object is stored
+		pub bucket_id: Uuid,
+		/// Key in which the related object is stored
+		pub key: String,
+	}
+
+	#[derive(PartialEq, Eq, Clone, Copy, Debug, Serialize, Deserialize)]
+	pub struct MpuPartKey {
+		/// Number of the part
+		pub part_number: u64,
+		/// Timestamp of part upload
+		pub timestamp: u64,
+	}
+
+	/// The version of an uploaded part
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub struct MpuPart {
+		/// Links to a Version in VersionTable
+		pub version: Uuid,
+		/// ETag of the content of this part (known only once done uploading)
+		pub etag: Option<String>,
+		/// Size of this part (known only once done uploading)
+		pub size: Option<u64>,
+	}
+
+	impl garage_util::migrate::InitialFormat for MultipartUpload {
+		const VERSION_MARKER: &'static [u8] = b"G09s3mpu";
+	}
+}
+
+pub use v09::*;
+
+impl Ord for MpuPartKey {
+	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+		self.part_number
+			.cmp(&other.part_number)
+			.then(self.timestamp.cmp(&other.timestamp))
+	}
+}
+
+impl PartialOrd for MpuPartKey {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl MultipartUpload {
+	pub fn new(upload_id: Uuid, bucket_id: Uuid, key: String, deleted: bool) -> Self {
+		Self {
+			upload_id,
+			deleted: crdt::Bool::new(deleted),
+			parts: crdt::Map::new(),
+			bucket_id,
+			key,
+		}
+	}
+
+	pub fn next_timestamp(&self, part_number: u64) -> u64 {
+		std::cmp::max(
+			now_msec(),
+			1 + self
+				.parts
+				.items()
+				.iter()
+				.filter(|(x, _)| x.part_number == part_number)
+				.map(|(x, _)| x.timestamp)
+				.max()
+				.unwrap_or(0),
+		)
+	}
+}
+
+impl Entry<Uuid, EmptyKey> for MultipartUpload {
+	fn partition_key(&self) -> &Uuid {
+		&self.upload_id
+	}
+	fn sort_key(&self) -> &EmptyKey {
+		&EmptyKey
+	}
+	fn is_tombstone(&self) -> bool {
+		self.deleted.get()
+	}
+}
+
+impl Crdt for MultipartUpload {
+	fn merge(&mut self, other: &Self) {
+		self.deleted.merge(&other.deleted);
+
+		if self.deleted.get() {
+			self.parts.clear();
+		} else {
+			self.parts.merge(&other.parts);
+		}
+	}
+}
+
+impl Crdt for MpuPart {
+	fn merge(&mut self, other: &Self) {
+		self.etag = match (self.etag.take(), &other.etag) {
+			(None, Some(_)) => other.etag.clone(),
+			(Some(x), Some(y)) if x < *y => other.etag.clone(),
+			(x, _) => x,
+		};
+		self.size = match (self.size, other.size) {
+			(None, Some(_)) => other.size,
+			(Some(x), Some(y)) if x < y => other.size,
+			(x, _) => x,
+		};
+	}
+}
+
+pub struct MultipartUploadTable {
+	pub version_table: Arc<Table<VersionTable, TableShardedReplication>>,
+	pub mpu_counter_table: Arc<IndexCounter<MultipartUpload>>,
+}
+
+impl TableSchema for MultipartUploadTable {
+	const TABLE_NAME: &'static str = "multipart_upload";
+
+	type P = Uuid;
+	type S = EmptyKey;
+	type E = MultipartUpload;
+	type Filter = DeletedFilter;
+
+	fn updated(
+		&self,
+		tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::TxOpResult<()> {
+		// 1. Count
+		let counter_res = self.mpu_counter_table.count(tx, old, new);
+		if let Err(e) = db::unabort(counter_res)? {
+			error!(
+				"Unable to update multipart object part counter: {}. Index values will be wrong!",
+				e
+			);
+		}
+
+		// 2. Propagate deletions to version table
+		if let (Some(old_mpu), Some(new_mpu)) = (old, new) {
+			if new_mpu.deleted.get() && !old_mpu.deleted.get() {
+				let deleted_versions = old_mpu.parts.items().iter().map(|(_k, p)| {
+					Version::new(
+						p.version,
+						VersionBacklink::MultipartUpload {
+							upload_id: old_mpu.upload_id,
+						},
+						true,
+					)
+				});
+				for version in deleted_versions {
+					let res = self.version_table.queue_insert(tx, &version);
+					if let Err(e) = db::unabort(res)? {
+						error!("Unable to enqueue version deletion propagation: {}. A repair will be needed.", e);
+					}
+				}
+			}
+		}
+
+		Ok(())
+	}
+
+	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
+		filter.apply(entry.is_tombstone())
+	}
+}
+
+impl CountedItem for MultipartUpload {
+	const COUNTER_TABLE_NAME: &'static str = "bucket_mpu_counter";
+
+	// Partition key = bucket id
+	type CP = Uuid;
+	// Sort key = nothing
+	type CS = EmptyKey;
+
+	fn counter_partition_key(&self) -> &Uuid {
+		&self.bucket_id
+	}
+	fn counter_sort_key(&self) -> &EmptyKey {
+		&EmptyKey
+	}
+
+	fn counts(&self) -> Vec<(&'static str, i64)> {
+		let uploads = if self.deleted.get() { 0 } else { 1 };
+		let mut parts = self
+			.parts
+			.items()
+			.iter()
+			.map(|(k, _)| k.part_number)
+			.collect::<Vec<_>>();
+		parts.dedup();
+		let bytes = self
+			.parts
+			.items()
+			.iter()
+			.map(|(_, p)| p.size.unwrap_or(0))
+			.sum::<u64>();
+		vec![
+			(UPLOADS, uploads),
+			(PARTS, parts.len() as i64),
+			(BYTES, bytes as i64),
+		]
+	}
+}
--- a/src/model/s3/object_table.rs
+++ b/src/model/s3/object_table.rs
@ -10,6 +10,7 @@ use garage_table::replication::TableShardedReplication;
 use garage_table::*;

 use crate::index_counter::*;
+use crate::s3::mpu_table::*;
 use crate::s3::version_table::*;

 pub const OBJECTS: &str = "objects";
@ -130,7 +131,86 @@ mod v08 {
 	}
 }

-pub use v08::*;
+mod v09 {
+	use garage_util::data::Uuid;
+	use serde::{Deserialize, Serialize};
+
+	use super::v08;
+
+	pub use v08::{ObjectVersionData, ObjectVersionHeaders, ObjectVersionMeta};
+
+	/// An object
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub struct Object {
+		/// The bucket in which the object is stored, used as partition key
+		pub bucket_id: Uuid,
+
+		/// The key at which the object is stored in its bucket, used as sorting key
+		pub key: String,
+
+		/// The list of currenty stored versions of the object
+		pub(super) versions: Vec<ObjectVersion>,
+	}
+
+	/// Informations about a version of an object
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub struct ObjectVersion {
+		/// Id of the version
+		pub uuid: Uuid,
+		/// Timestamp of when the object was created
+		pub timestamp: u64,
+		/// State of the version
+		pub state: ObjectVersionState,
+	}
+
+	/// State of an object version
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub enum ObjectVersionState {
+		/// The version is being received
+		Uploading {
+			/// Indicates whether this is a multipart upload
+			multipart: bool,
+			/// Headers to be included in the final object
+			headers: ObjectVersionHeaders,
+		},
+		/// The version is fully received
+		Complete(ObjectVersionData),
+		/// The version uploaded containded errors or the upload was explicitly aborted
+		Aborted,
+	}
+
+	impl garage_util::migrate::Migrate for Object {
+		const VERSION_MARKER: &'static [u8] = b"G09s3o";
+
+		type Previous = v08::Object;
+
+		fn migrate(old: v08::Object) -> Object {
+			let versions = old
+				.versions
+				.into_iter()
+				.map(|x| ObjectVersion {
+					uuid: x.uuid,
+					timestamp: x.timestamp,
+					state: match x.state {
+						v08::ObjectVersionState::Uploading(h) => ObjectVersionState::Uploading {
+							multipart: false,
+							headers: h,
+						},
+						v08::ObjectVersionState::Complete(d) => ObjectVersionState::Complete(d),
+						v08::ObjectVersionState::Aborted => ObjectVersionState::Aborted,
+					},
+				})
+				.collect();
+			Object {
+				bucket_id: old.bucket_id,
+				key: old.key,
+				versions,
+			}
+		}
+	}
+}
+
+pub use v09::*;

 impl Object {
 	/// Initialize an Object struct from parts
@ -180,11 +260,11 @@ impl Crdt for ObjectVersionState {
 				Complete(a) => {
 					a.merge(b);
 				}
-				Uploading(_) => {
+				Uploading { .. } => {
 					*self = Complete(b.clone());
 				}
 			},
-			Uploading(_) => {}
+			Uploading { .. } => {}
 		}
 	}
 }
@ -199,8 +279,17 @@ impl ObjectVersion {
 	}

 	/// Is the object version currently being uploaded
-	pub fn is_uploading(&self) -> bool {
-		matches!(self.state, ObjectVersionState::Uploading(_))
+	///
+	/// matches only multipart uploads if check_multipart is Some(true)
+	/// matches only non-multipart uploads if check_multipart is Some(false)
+	/// matches both if check_multipart is None
+	pub fn is_uploading(&self, check_multipart: Option<bool>) -> bool {
+		match &self.state {
+			ObjectVersionState::Uploading { multipart, .. } => {
+				check_multipart.map(|x| x == *multipart).unwrap_or(true)
+			}
+			_ => false,
+		}
 	}

 	/// Is the object version completely received
@ -267,13 +356,20 @@ impl Crdt for Object {

 pub struct ObjectTable {
 	pub version_table: Arc<Table<VersionTable, TableShardedReplication>>,
+	pub mpu_table: Arc<Table<MultipartUploadTable, TableShardedReplication>>,
 	pub object_counter_table: Arc<IndexCounter<Object>>,
 }

 #[derive(Clone, Copy, Debug, Serialize, Deserialize)]
 pub enum ObjectFilter {
+	/// Is the object version available (received and not a tombstone)
 	IsData,
-	IsUploading,
+	/// Is the object version currently being uploaded
+	///
+	/// matches only multipart uploads if check_multipart is Some(true)
+	/// matches only non-multipart uploads if check_multipart is Some(false)
+	/// matches both if check_multipart is None
+	IsUploading { check_multipart: Option<bool> },
 }

 impl TableSchema for ObjectTable {
@ -301,21 +397,28 @@ impl TableSchema for ObjectTable {

 		// 2. Enqueue propagation deletions to version table
 		if let (Some(old_v), Some(new_v)) = (old, new) {
-			// Propagate deletion of old versions
 			for v in old_v.versions.iter() {
-				let newly_deleted = match new_v
+				let new_v_id = new_v
 					.versions
-					.binary_search_by(|nv| nv.cmp_key().cmp(&v.cmp_key()))
-				{
+					.binary_search_by(|nv| nv.cmp_key().cmp(&v.cmp_key()));
+
+				// Propagate deletion of old versions to the Version table
+				let delete_version = match new_v_id {
 					Err(_) => true,
 					Ok(i) => {
 						new_v.versions[i].state == ObjectVersionState::Aborted
 							&& v.state != ObjectVersionState::Aborted
 					}
 				};
-				if newly_deleted {
-					let deleted_version =
-						Version::new(v.uuid, old_v.bucket_id, old_v.key.clone(), true);
+				if delete_version {
+					let deleted_version = Version::new(
+						v.uuid,
+						VersionBacklink::Object {
+							bucket_id: old_v.bucket_id,
+							key: old_v.key.clone(),
+						},
+						true,
+					);
 					let res = self.version_table.queue_insert(tx, &deleted_version);
 					if let Err(e) = db::unabort(res)? {
 						error!(
@ -324,6 +427,34 @@ impl TableSchema for ObjectTable {
 						);
 					}
 				}
+
+				// After abortion or completion of multipart uploads, delete MPU table entry
+				if matches!(
+					v.state,
+					ObjectVersionState::Uploading {
+						multipart: true,
+						..
+					}
+				) {
+					let delete_mpu = match new_v_id {
+						Err(_) => true,
+						Ok(i) => !matches!(
+							new_v.versions[i].state,
+							ObjectVersionState::Uploading { .. }
+						),
+					};
+					if delete_mpu {
+						let deleted_mpu =
+							MultipartUpload::new(v.uuid, old_v.bucket_id, old_v.key.clone(), true);
+						let res = self.mpu_table.queue_insert(tx, &deleted_mpu);
+						if let Err(e) = db::unabort(res)? {
+							error!(
+								"Unable to enqueue multipart upload deletion propagation: {}. A repair will be needed.",
+								e
+							);
+						}
+					}
+				}
 			}
 		}

@ -333,7 +464,10 @@ impl TableSchema for ObjectTable {
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
 		match filter {
 			ObjectFilter::IsData => entry.versions.iter().any(|v| v.is_data()),
-			ObjectFilter::IsUploading => entry.versions.iter().any(|v| v.is_uploading()),
+			ObjectFilter::IsUploading { check_multipart } => entry
+				.versions
+				.iter()
+				.any(|v| v.is_uploading(*check_multipart)),
 		}
 	}
 }
@ -360,10 +494,7 @@ impl CountedItem for Object {
 		} else {
 			0
 		};
-		let n_unfinished_uploads = versions
-			.iter()
-			.filter(|v| matches!(v.state, ObjectVersionState::Uploading(_)))
-			.count();
+		let n_unfinished_uploads = versions.iter().filter(|v| v.is_uploading(None)).count();
 		let n_bytes = versions
 			.iter()
 			.map(|v| match &v.state {
--- a/src/model/s3/version_table.rs
+++ b/src/model/s3/version_table.rs
@ -3,6 +3,7 @@ use std::sync::Arc;
 use garage_db as db;

 use garage_util::data::*;
+use garage_util::error::*;

 use garage_table::crdt::*;
 use garage_table::replication::TableShardedReplication;
@ -66,6 +67,8 @@ mod v08 {

 	use super::v05;

+	pub use v05::{VersionBlock, VersionBlockKey};
+
 	/// A version of an object
 	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
 	pub struct Version {
@ -90,8 +93,6 @@ mod v08 {
 		pub key: String,
 	}

-	pub use v05::{VersionBlock, VersionBlockKey};
-
 	impl garage_util::migrate::Migrate for Version {
 		type Previous = v05::Version;

@ -110,32 +111,94 @@ mod v08 {
 	}
 }

-pub use v08::*;
+pub(crate) mod v09 {
+	use garage_util::crdt;
+	use garage_util::data::Uuid;
+	use serde::{Deserialize, Serialize};
+
+	use super::v08;
+
+	pub use v08::{VersionBlock, VersionBlockKey};
+
+	/// A version of an object
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub struct Version {
+		/// UUID of the version, used as partition key
+		pub uuid: Uuid,
+
+		// Actual data: the blocks for this version
+		// In the case of a multipart upload, also store the etags
+		// of individual parts and check them when doing CompleteMultipartUpload
+		/// Is this version deleted
+		pub deleted: crdt::Bool,
+		/// list of blocks of data composing the version
+		pub blocks: crdt::Map<VersionBlockKey, VersionBlock>,
+
+		// Back link to owner of this version (either an object or a multipart
+		// upload), used to find whether it has been deleted and this version
+		// should in turn be deleted (see versions repair procedure)
+		pub backlink: VersionBacklink,
+	}
+
+	#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+	pub enum VersionBacklink {
+		Object {
+			/// Bucket in which the related object is stored
+			bucket_id: Uuid,
+			/// Key in which the related object is stored
+			key: String,
+		},
+		MultipartUpload {
+			upload_id: Uuid,
+		},
+	}
+
+	impl garage_util::migrate::Migrate for Version {
+		const VERSION_MARKER: &'static [u8] = b"G09s3v";
+
+		type Previous = v08::Version;
+
+		fn migrate(old: v08::Version) -> Version {
+			Version {
+				uuid: old.uuid,
+				deleted: old.deleted,
+				blocks: old.blocks,
+				backlink: VersionBacklink::Object {
+					bucket_id: old.bucket_id,
+					key: old.key,
+				},
+			}
+		}
+	}
+}
+
+pub use v09::*;

 impl Version {
-	pub fn new(uuid: Uuid, bucket_id: Uuid, key: String, deleted: bool) -> Self {
+	pub fn new(uuid: Uuid, backlink: VersionBacklink, deleted: bool) -> Self {
 		Self {
 			uuid,
 			deleted: deleted.into(),
 			blocks: crdt::Map::new(),
-			parts_etags: crdt::Map::new(),
-			bucket_id,
-			key,
+			backlink,
 		}
 	}

 	pub fn has_part_number(&self, part_number: u64) -> bool {
-		let case1 = self
-			.parts_etags
-			.items()
-			.binary_search_by(|(k, _)| k.cmp(&part_number))
-			.is_ok();
-		let case2 = self
-			.blocks
+		self.blocks
 			.items()
 			.binary_search_by(|(k, _)| k.part_number.cmp(&part_number))
-			.is_ok();
-		case1 || case2
+			.is_ok()
+	}
+
+	pub fn n_parts(&self) -> Result<u64, Error> {
+		Ok(self
+			.blocks
+			.items()
+			.last()
+			.ok_or_message("version has no parts")?
+			.0
+			.part_number)
 	}
 }

@ -175,10 +238,8 @@ impl Crdt for Version {

 		if self.deleted.get() {
 			self.blocks.clear();
-			self.parts_etags.clear();
 		} else {
 			self.blocks.merge(&other.blocks);
-			self.parts_etags.merge(&other.parts_etags);
 		}
 	}
 }
--- a/src/rpc/layout.rs
+++ b/src/rpc/layout.rs
@ -119,7 +119,7 @@ mod v09 {
 	}

 	impl garage_util::migrate::Migrate for ClusterLayout {
-		const VERSION_MARKER: &'static [u8] = b"Glayout09";
+		const VERSION_MARKER: &'static [u8] = b"G09layout";

 		type Previous = v08::ClusterLayout;

--- a/src/table/data.rs
+++ b/src/table/data.rs
@ -347,9 +347,7 @@ impl<F: TableSchema, R: TableReplication> TableData<F, R> {
 	// ---- Utility functions ----

 	pub fn tree_key(&self, p: &F::P, s: &F::S) -> Vec<u8> {
-		let mut ret = p.hash().to_vec();
-		ret.extend(s.sort_key());
-		ret
+		[p.hash().as_slice(), s.sort_key()].concat()
 	}

 	pub fn decode_entry(&self, bytes: &[u8]) -> Result<F::E, Error> {
--- a/src/table/schema.rs
+++ b/src/table/schema.rs
@ -6,6 +6,8 @@ use garage_util::migrate::Migrate;

 use crate::crdt::Crdt;

+// =================================== PARTITION KEYS
+
 /// Trait for field used to partition data
 pub trait PartitionKey:
 	Clone + PartialEq + Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static
@ -29,6 +31,8 @@ impl PartitionKey for FixedBytes32 {
 	}
 }

+// =================================== SORT KEYS
+
 /// Trait for field used to sort data
 pub trait SortKey: Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static {
 	/// Get the key used to sort
@ -47,6 +51,8 @@ impl SortKey for FixedBytes32 {
 	}
 }

+// =================================== SCHEMA
+
 /// Trait for an entry in a table. It must be sortable and partitionnable.
 pub trait Entry<P: PartitionKey, S: SortKey>:
 	Crdt + PartialEq + Clone + Migrate + Send + Sync + 'static
--- a/src/web/web_server.rs
+++ b/src/web/web_server.rs
@ -106,7 +106,7 @@ impl WebServer {
 		addr: SocketAddr,
 	) -> Result<Response<Body>, Infallible> {
 		if let Ok(forwarded_for_ip_addr) =
-			forwarded_headers::handle_forwarded_for_headers(&req.headers())
+			forwarded_headers::handle_forwarded_for_headers(req.headers())
 		{
 			info!(
 				"{} (via {}) {} {}",