lib/db, lib/model: Avoid accounting mishap on folder restart (fixes #6938) (#6939)

We created a new fileset before stopping the folder during restart. When
we create that fileset it loads the current metadata and sequence
numbers from the database. But the folder may have time to update those
before stopping, leaving the new fileset with bad data.

This would cause wrong accounting (forgotten files) and potentially
sequence reuse causing files not sent to other devices.

This change reuses the fileset on restart, skipping the issue entirely.
It also moves the creation of the fileset back under the lock so there
should be no chance of concurrency issues here.

go.mod

@@ -19,14 +19,14 @@ require (
 	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/gobwas/glob v0.2.3
 	github.com/gogo/protobuf v1.3.1
-	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6
+	github.com/golang/groupcache v0.0.0-20191027212112-611e8accdfc9
 	github.com/greatroar/blobloom v0.3.0
 	github.com/jackpal/gateway v1.0.6
 	github.com/jackpal/go-nat-pmp v1.0.2
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/kr/pretty v0.2.0 // indirect
 	github.com/lib/pq v1.2.0
-	github.com/lucas-clemente/quic-go v0.17.3
+	github.com/lucas-clemente/quic-go v0.18.0
 	github.com/maruel/panicparse v1.3.0
 	github.com/mattn/go-isatty v0.0.11
 	github.com/minio/sha256-simd v0.1.1
@@ -36,17 +36,18 @@ require (
 	github.com/prometheus/client_golang v1.2.1
 	github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563
 	github.com/sasha-s/go-deadlock v0.2.0
-	github.com/shirou/gopsutil v0.0.0-20190714054239-47ef3260b6bf
+	github.com/shirou/gopsutil v2.20.7+incompatible
 	github.com/syncthing/notify v0.0.0-20190709140112-69c7a957d3e2
-	github.com/syndtr/goleveldb v1.0.1-0.20190923125748-758128399b1d
+	github.com/syndtr/goleveldb v1.0.1-0.20200815071216-d9e9293bd0f7
 	github.com/thejerf/suture v3.0.2+incompatible
 	github.com/urfave/cli v1.22.2
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
-	golang.org/x/crypto v0.0.0-20200423211502-4bdfaf469ed5
-	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297
-	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae
+	golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de
+	golang.org/x/net v0.0.0-20200813134508-3edf25e44fcc
+	golang.org/x/sys v0.0.0-20200819171115-d785dc25833f
 	golang.org/x/text v0.3.3
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
+	google.golang.org/protobuf v1.25.0 // indirect
 )
 
 go 1.14

go.sum

@@ -18,8 +18,6 @@ github.com/DataDog/zstd v1.4.1 h1:3oxKN3wbHibqx897utPC2LTQU4J+IHWWJO+glkAkpFM=
 github.com/DataDog/zstd v1.4.1/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 h1:fLjPD/aNc3UIOA6tDi6QXUemppXK3P9BI7mr2hd6gx8=
-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUWq3EgK3CesDbo8upS2Vm9/P3FtgI+Jk=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -45,6 +43,7 @@ github.com/calmh/xdr v1.1.0 h1:U/Dd4CXNLoo8EiQ4ulJUXkgO1/EyQLgDKLgpY1SOoJE=
 github.com/calmh/xdr v1.1.0/go.mod h1:E8sz2ByAdXC8MbANf1LCRYzedSnnc+/sXXJs/PVqoeg=
 github.com/ccding/go-stun v0.0.0-20180726100737-be486d185f3d h1:As4937T5NVbJ/DmZT9z33pyLEprMd6CUSfhbmMY57Io=
 github.com/ccding/go-stun v0.0.0-20180726100737-be486d185f3d/go.mod h1:3FK1bMar37f7jqVY7q/63k3OMX1c47pGCufzt3X0sYE=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/certifi/gocertifi v0.0.0-20190905060710-a5e0173ced67 h1:8k9FLYBLKT+9v2HQJ/a95ZemmTx+/ltJcAiRhVushG8=
 github.com/certifi/gocertifi v0.0.0-20190905060710-a5e0173ced67/go.mod h1:GJKEexRPVJrBSOjoqN5VNOIKJ5Q3RViH6eu3puDRwx4=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
@@ -79,6 +78,8 @@ github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 h1:tdlZCpZ/P9DhczC
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568 h1:BMXYYRWTLOJKlh+lOBt6nUQgXAfB7oVIQt5cNreqSLI=
 github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:rZfgFAXFS/z/lEd6LJmf9HVZ1LkgYiHx5pHhV5DR16M=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
@@ -86,6 +87,8 @@ github.com/francoispqt/gojay v1.2.13 h1:d2m3sFjloqoIUQU3TsHBgj6qg/BVGlTBeHDUmyJn
 github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiDsoyrBGkyDY=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/getsentry/raven-go v0.2.0 h1:no+xWJRb5ZI7eE8TWgIq1jLulQiIoLG0IfYxv5JYMGs=
 github.com/getsentry/raven-go v0.2.0/go.mod h1:KungGk8q33+aIAZUIVWZDr2OfAEBsO49PX4NzFV5kcQ=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
@@ -99,8 +102,6 @@ github.com/go-ldap/ldap/v3 v3.2.0 h1:fkS0nXg43MZvU0UNTOGyQv60WdwHRXa1eX0CSzuKLvY
 github.com/go-ldap/ldap/v3 v3.2.0/go.mod h1:dtLsnBXnSLIsMRbCBuRpHflCGaYzZ5jn+x1q7XqMTKU=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
-github.com/go-ole/go-ole v1.2.1 h1:2lOsA72HgjxAuMlKpFiCbHTvu44PIVkZ5hqm3RSdI/E=
-github.com/go-ole/go-ole v1.2.1/go.mod h1:7FAglXiTm7HKlQRDeOQ6ZNUHidzCWXuZWq/1dTyBNF8=
 github.com/go-ole/go-ole v1.2.4 h1:nNBDSCOigTSiarFpYE9J/KtEA1IOW4CNeqT9TQDqCxI=
 github.com/go-ole/go-ole v1.2.4/go.mod h1:XCwSNxSkXRo4vlyPy93sltvi/qJq0jqQhjqQNIwKuxM=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
@@ -112,12 +113,16 @@ github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXP
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 h1:ZgQEtGgCBiWRM39fZuwSd1LwSqqSW0hOdXCYYDX0R3I=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20191027212112-611e8accdfc9 h1:uHTyIjqVhYRhLbJ8nIiOJHkEZZ+5YoOsAbD3sk82NiE=
+github.com/golang/groupcache v0.0.0-20191027212112-611e8accdfc9/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.2.0 h1:28o5sBqPkBsMGnC6b4MvE2TzSr5/AT4c/1fLqVGIwlk=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.4.0 h1:Rd1kQnQu0Hq3qvJppYSG0HtP+f5LPPUiDswTLiEegLg=
 github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
+github.com/golang/mock v1.4.4 h1:l75CXGRSwbaYNpl/Z2X1XIIAMSCquvXgpVZDhwEIJsc=
+github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
@@ -130,6 +135,9 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0 h1:oOuy+ugB+P/kBdUnG5QaMXSIyJ1q38wWSojYCb3z5VQ=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
+github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
@@ -139,6 +147,8 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
+github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -179,14 +189,16 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
-github.com/lucas-clemente/quic-go v0.17.3 h1:jMX/MmDNCljfisgMmPGUcBJ+zUh9w3d3ia4YJjYS3TM=
-github.com/lucas-clemente/quic-go v0.17.3/go.mod h1:I0+fcNTdb9eS1ZcjQZbDVPGchJ86chcIxPALn9lEJqE=
+github.com/lucas-clemente/quic-go v0.18.0 h1:JhQDdqxdwdmGdKsKgXi1+coHRoGhvU6z0rNzOJqZ/4o=
+github.com/lucas-clemente/quic-go v0.18.0/go.mod h1:yXttHsSNxQi8AWijC/vLP+OJczXqzHSOcJrM5ITUlCg=
 github.com/lunixbochs/vtclean v1.0.0/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm/+2c2E2WMI=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mailru/easyjson v0.0.0-20190312143242-1de009706dbe/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
-github.com/marten-seemann/qpack v0.1.0/go.mod h1:LFt1NU/Ptjip0C2CPkhimBz5CGE3WGDAUWqna+CNTrI=
-github.com/marten-seemann/qtls v0.9.1 h1:O0YKQxNVPaiFgMng0suWEOY2Sb4LT2sRn9Qimq3Z1IQ=
-github.com/marten-seemann/qtls v0.9.1/go.mod h1:T1MmAdDPyISzxlK6kjRr0pcZFBVd1OZbBb/j3cvzHhk=
+github.com/marten-seemann/qpack v0.2.0/go.mod h1:F7Gl5L1jIgN1D11ucXefiuJS9UMVP2opoCp2jDKb7wc=
+github.com/marten-seemann/qtls v0.10.0 h1:ECsuYUKalRL240rRD4Ri33ISb7kAQ3qGDlrrl55b2pc=
+github.com/marten-seemann/qtls v0.10.0/go.mod h1:UvMd1oaYDACI99/oZUYLzMCkBXQVT0aGm99sJhbT8hs=
+github.com/marten-seemann/qtls-go1-15 v0.1.0 h1:i/YPXVxz8q9umso/5y474CNcHmTpA+5DH+mFPjx6PZg=
+github.com/marten-seemann/qtls-go1-15 v0.1.0/go.mod h1:GyFwywLKkRt+6mfU99csTEY1joMZz5vmB1WNZH3P81I=
 github.com/maruel/panicparse v1.3.0 h1:1Ep/RaYoSL1r5rTILHQQbyzHG8T4UP5ZbQTYTo4bdDc=
 github.com/maruel/panicparse v1.3.0/go.mod h1:vszMjr5QQ4F5FSRfraldcIA/BCw5xrdLL+zEcU2nRBs=
 github.com/mattn/go-colorable v0.1.1 h1:G1f5SKeVxmagw/IyvzvtZE4Gybcc4Tr1tf7I8z0XgOg=
@@ -212,15 +224,15 @@ github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3Rllmb
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
 github.com/neelance/sourcemap v0.0.0-20151028013722-8c68805598ab/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM=
+github.com/nxadm/tail v1.4.4 h1:DQuhQpB1tVlglWS2hLQ5OV6B5r8aGxSrPc5Qo6uTN78=
+github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
-github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/ginkgo v1.11.0 h1:JAKSXpt1YjtLA7YpPiqO9ss6sNXEsPfSGdwN0UHqzrw=
-github.com/onsi/ginkgo v1.11.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
-github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
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@@ -267,9 +279,8 @@ github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQD
 github.com/sasha-s/go-deadlock v0.2.0 h1:lMqc+fUb7RrFS3gQLtoQsJ7/6TV/pAIFvBsqX73DK8Y=
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 github.com/shurcooL/github_flavored_markdown v0.0.0-20181002035957-2122de532470/go.mod h1:2dOwnU2uBioM+SGy2aZoq1f/Sd1l9OkAeAUvjSyvgU0=
@@ -320,8 +331,8 @@ github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
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@@ -336,6 +347,7 @@ github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0 h1:okhMind4q9H1OxF44gN
 github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0/go.mod h1:TTbGUfE+cXXceWtbTHq6lqcTvYPBKLNejBEbnUsQJtU=
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 go.opencensus.io v0.18.0/go.mod h1:vKdFvxhtzZ9onBp9VKHK8z/sRpBMnKAsufL7wlDrCOA=
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@@ -346,12 +358,15 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
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@@ -360,14 +375,16 @@ golang.org/x/net v0.0.0-20181106065722-10aee1819953/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -379,6 +396,7 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -393,19 +411,30 @@ golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5h
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 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -418,10 +447,13 @@ golang.org/x/tools v0.0.0-20181030000716-a0a13e073c7b/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.0.0-20181030000543-1d582fd0359e/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.1.0/go.mod h1:UGEZY7KEX120AnNLIHFMKIo4obdJhkp2tPbaPlQx13Y=
@@ -434,21 +466,32 @@ google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoA
 google.golang.org/genproto v0.0.0-20181029155118-b69ba1387ce2/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
 google.golang.org/genproto v0.0.0-20190306203927-b5d61aea6440/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0 h1:qdOKuR/EIArgaWNjetjgTzgVTAZ+S/WXVrq9HW9zimw=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
@@ -462,10 +505,13 @@ gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=

lib/config/config.go

@@ -31,7 +31,7 @@ import (
 
 const (
 	OldestHandledVersion = 10
-	CurrentVersion       = 31
+	CurrentVersion       = 32
 	MaxRescanIntervalS   = 365 * 24 * 60 * 60
 )
 

lib/config/config_test.go

@@ -126,6 +126,7 @@ func TestDeviceConfig(t *testing.T) {
 				},
 				WeakHashThresholdPct: 25,
 				MarkerName:           DefaultMarkerName,
+				JunctionsAsDirs:      true,
 			},
 		}
 

lib/config/folderconfiguration.go

@@ -62,6 +62,7 @@ type FolderConfiguration struct {
 	BlockPullOrder          BlockPullOrder              `xml:"blockPullOrder" json:"blockPullOrder"`
 	CopyRangeMethod         fs.CopyRangeMethod          `xml:"copyRangeMethod" json:"copyRangeMethod" default:"standard"`
 	CaseSensitiveFS         bool                        `xml:"caseSensitiveFS" json:"caseSensitiveFS"`
+	JunctionsAsDirs         bool                        `xml:"junctionsAsDirs" json:"junctionsAsDirs"`
 
 	cachedModTimeWindow time.Duration
 
@@ -101,7 +102,11 @@ func (f FolderConfiguration) Copy() FolderConfiguration {
 func (f FolderConfiguration) Filesystem() fs.Filesystem {
 	// This is intentionally not a pointer method, because things like
 	// cfg.Folders["default"].Filesystem() should be valid.
-	filesystem := fs.NewFilesystem(f.FilesystemType, f.Path)
+	var opts []fs.Option
+	if f.FilesystemType == fs.FilesystemTypeBasic && f.JunctionsAsDirs {
+		opts = append(opts, fs.WithJunctionsAsDirs())
+	}
+	filesystem := fs.NewFilesystem(f.FilesystemType, f.Path, opts...)
 	if !f.CaseSensitiveFS {
 		filesystem = fs.NewCaseFilesystem(filesystem)
 	}

lib/config/migrations.go

@@ -25,6 +25,7 @@ import (
 // update the config version. The order of migrations doesn't matter here,
 // put the newest on top for readability.
 var migrations = migrationSet{
+	{32, migrateToConfigV32},
 	{31, migrateToConfigV31},
 	{30, migrateToConfigV30},
 	{29, migrateToConfigV29},
@@ -91,6 +92,12 @@ func migrateToConfigV31(cfg *Configuration) {
 	cfg.Options.UnackedNotificationIDs = append(cfg.Options.UnackedNotificationIDs, "authenticationUserAndPassword")
 }
 
+func migrateToConfigV32(cfg *Configuration) {
+	for i := range cfg.Folders {
+		cfg.Folders[i].JunctionsAsDirs = true
+	}
+}
+
 func migrateToConfigV30(cfg *Configuration) {
 	// The "max concurrent scans" option is now spelled "max folder concurrency"
 	// to be more general.

lib/db/lowlevel.go

@@ -140,6 +140,7 @@ func (db *Lowlevel) updateRemoteFiles(folder, device []byte, fs []protocol.FileI
 			return err
 		}
 		if ok && unchanged(f, ef) {
+			l.Debugf("not inserting unchanged (remote); folder=%q device=%v %v", folder, devID, f)
 			continue
 		}
 
@@ -148,7 +149,7 @@ func (db *Lowlevel) updateRemoteFiles(folder, device []byte, fs []protocol.FileI
 		}
 		meta.addFile(devID, f)
 
-		l.Debugf("insert; folder=%q device=%v %v", folder, devID, f)
+		l.Debugf("insert (remote); folder=%q device=%v %v", folder, devID, f)
 		if err := t.putFile(dk, f); err != nil {
 			return err
 		}
@@ -196,6 +197,7 @@ func (db *Lowlevel) updateLocalFiles(folder []byte, fs []protocol.FileInfo, meta
 			return err
 		}
 		if ok && unchanged(f, ef) {
+			l.Debugf("not inserting unchanged (local); folder=%q %v", folder, f)
 			continue
 		}
 		blocksHashSame := ok && bytes.Equal(ef.BlocksHash, f.BlocksHash)

lib/fs/basicfs.go

@@ -23,13 +23,24 @@ var (
 	ErrNotRelative     = errors.New("not a relative path")
 )
 
+func WithJunctionsAsDirs() Option {
+	return func(fs Filesystem) {
+		if basic, ok := fs.(*BasicFilesystem); !ok {
+			l.Warnln("WithJunctionsAsDirs must only be used with FilesystemTypeBasic")
+		} else {
+			basic.junctionsAsDirs = true
+		}
+	}
+}
+
 // The BasicFilesystem implements all aspects by delegating to package os.
 // All paths are relative to the root and cannot (should not) escape the root directory.
 type BasicFilesystem struct {
-	root string
+	root            string
+	junctionsAsDirs bool
 }
 
-func newBasicFilesystem(root string) *BasicFilesystem {
+func newBasicFilesystem(root string, opts ...Option) *BasicFilesystem {
 	if root == "" {
 		root = "." // Otherwise "" becomes "/" below
 	}
@@ -64,7 +75,13 @@ func newBasicFilesystem(root string) *BasicFilesystem {
 		root = longFilenameSupport(root)
 	}
 
-	return &BasicFilesystem{root}
+	fs := &BasicFilesystem{
+		root: root,
+	}
+	for _, opt := range opts {
+		opt(fs)
+	}
+	return fs
 }
 
 // rooted expands the relative path to the full path that is then used with os
@@ -145,7 +162,7 @@ func (f *BasicFilesystem) Lstat(name string) (FileInfo, error) {
 	if err != nil {
 		return nil, err
 	}
-	fi, err := underlyingLstat(name)
+	fi, err := f.underlyingLstat(name)
 	if err != nil {
 		return nil, err
 	}

lib/fs/basicfs_lstat_broken.go

@@ -16,7 +16,7 @@ import (
 
 // Lstat is like os.Lstat, except lobotomized for Android. See
 // https://forum.syncthing.net/t/2395
-func underlyingLstat(name string) (fi os.FileInfo, err error) {
+func (*BasicFilesystem) underlyingLstat(name string) (fi os.FileInfo, err error) {
 	for i := 0; i < 10; i++ { // We have to draw the line somewhere
 		fi, err = os.Lstat(name)
 		if err, ok := err.(*os.PathError); ok && err.Err == syscall.EINTR {

lib/fs/basicfs_lstat_regular.go

@@ -10,6 +10,6 @@ package fs
 
 import "os"
 
-func underlyingLstat(name string) (fi os.FileInfo, err error) {
+func (*BasicFilesystem) underlyingLstat(name string) (fi os.FileInfo, err error) {
 	return os.Lstat(name)
 }

lib/fs/basicfs_lstat_windows.go

@@ -66,12 +66,12 @@ func (fi *dirJunctFileInfo) IsDir() bool {
 	return true
 }
 
-func underlyingLstat(name string) (os.FileInfo, error) {
+func (f *BasicFilesystem) underlyingLstat(name string) (os.FileInfo, error) {
 	var fi, err = os.Lstat(name)
 
-	// NTFS directory junctions are treated as ordinary directories,
+	// NTFS directory junctions can be treated as ordinary directories,
 	// see https://forum.syncthing.net/t/option-to-follow-directory-junctions-symbolic-links/14750
-	if err == nil && fi.Mode()&os.ModeSymlink != 0 {
+	if err == nil && f.junctionsAsDirs && fi.Mode()&os.ModeSymlink != 0 {
 		var isJunct bool
 		isJunct, err = isDirectoryJunction(name)
 		if err == nil && isJunct {

lib/fs/fakefs.go

@@ -66,7 +66,7 @@ var (
 	fakefsFs  = make(map[string]*fakefs)
 )
 
-func newFakeFilesystem(rootURI string) *fakefs {
+func newFakeFilesystem(rootURI string, _ ...Option) *fakefs {
 	fakefsMut.Lock()
 	defer fakefsMut.Unlock()
 

lib/fs/filesystem.go

@@ -178,13 +178,15 @@ var IsPermission = os.IsPermission
 // IsPathSeparator is the equivalent of os.IsPathSeparator
 var IsPathSeparator = os.IsPathSeparator
 
-func NewFilesystem(fsType FilesystemType, uri string) Filesystem {
+type Option func(Filesystem)
+
+func NewFilesystem(fsType FilesystemType, uri string, opts ...Option) Filesystem {
 	var fs Filesystem
 	switch fsType {
 	case FilesystemTypeBasic:
-		fs = newBasicFilesystem(uri)
+		fs = newBasicFilesystem(uri, opts...)
 	case FilesystemTypeFake:
-		fs = newFakeFilesystem(uri)
+		fs = newFakeFilesystem(uri, opts...)
 	default:
 		l.Debugln("Unknown filesystem", fsType, uri)
 		fs = &errorFilesystem{

lib/fs/walkfs_test.go

@@ -57,7 +57,7 @@ func testWalkTraverseDirJunct(t *testing.T, fsType FilesystemType, uri string) {
 		t.Skip("Directory junctions are available and tested on windows only")
 	}
 
-	fs := NewFilesystem(fsType, uri)
+	fs := NewFilesystem(fsType, uri, WithJunctionsAsDirs())
 
 	if err := fs.MkdirAll("target/foo", 0); err != nil {
 		t.Fatal(err)
@@ -90,7 +90,7 @@ func testWalkInfiniteRecursion(t *testing.T, fsType FilesystemType, uri string)
 		t.Skip("Infinite recursion detection is tested on windows only")
 	}
 
-	fs := NewFilesystem(fsType, uri)
+	fs := NewFilesystem(fsType, uri, WithJunctionsAsDirs())
 
 	if err := fs.MkdirAll("target/foo", 0); err != nil {
 		t.Fatal(err)

lib/model/folder.go

@@ -484,10 +484,11 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 				// What we have locally is equivalent to the global file.
 				fi.Version = fi.Version.Merge(gf.Version)
 				fallthrough
-			case fi.IsDeleted() && gf.IsReceiveOnlyChanged():
+			case fi.IsDeleted() && (gf.IsReceiveOnlyChanged() || gf.IsDeleted()):
 				// Our item is deleted and the global item is our own
-				// receive only file. We can't delete file infos, so
-				// we just pretend it is a normal deleted file (nobody
+				// receive only file or deleted too. In the former
+				// case we can't delete file infos, so we just
+				// pretend it is a normal deleted file (nobody
 				// cares about that).
 				fi.LocalFlags &^= protocol.FlagLocalReceiveOnly
 			}
@@ -624,21 +625,20 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 					// sure the file gets in sync on the following pull.
 					nf.Version = protocol.Vector{}
 				}
-				// Check for deleted, locally changed items that noone else has.
-				if f.localFlags&protocol.FlagLocalReceiveOnly != 0 && len(snap.Availability(file.Name)) == 0 {
-					file.LocalFlags &^= protocol.FlagLocalReceiveOnly
-				}
+				l.Debugln("marking file as deleted", nf)
 				batchAppend(nf, snap)
 				changes++
 			case file.IsDeleted() && file.IsReceiveOnlyChanged() && f.localFlags&protocol.FlagLocalReceiveOnly != 0 && len(snap.Availability(file.Name)) == 0:
 				file.Version = protocol.Vector{}
 				file.LocalFlags &^= protocol.FlagLocalReceiveOnly
+				l.Debugln("marking deleted item that doesn't exist anywhere as not receive-only", file)
 				batchAppend(file.ConvertDeletedToFileInfo(), snap)
 				changes++
-			case file.IsDeleted() && file.LocalFlags != f.localFlags:
-				// No need to bump the version for a file that was
-				// and is deleted and just the local flags changed.
-				file.LocalFlags = f.localFlags
+			case file.IsDeleted() && file.IsReceiveOnlyChanged() && f.Type != config.FolderTypeReceiveOnly:
+				// No need to bump the version for a file that was and is
+				// deleted and just the folder type/local flags changed.
+				file.LocalFlags &^= protocol.FlagLocalReceiveOnly
+				l.Debugln("removing receive-only flag on deleted item", file)
 				batchAppend(file.ConvertDeletedToFileInfo(), snap)
 				changes++
 			}

lib/model/folder_sendrecv.go

@@ -61,18 +61,17 @@ type copyBlocksState struct {
 const retainBits = fs.ModeSetgid | fs.ModeSetuid | fs.ModeSticky
 
 var (
-	activity                    = newDeviceActivity()
-	errNoDevice                 = errors.New("peers who had this file went away, or the file has changed while syncing. will retry later")
-	errDirPrefix                = "directory has been deleted on a remote device but "
-	errDirHasToBeScanned        = errors.New(errDirPrefix + "contains changed files, scheduling scan")
-	errDirHasIgnored            = errors.New(errDirPrefix + "contains ignored files (see ignore documentation for (?d) prefix)")
-	errDirHasReceiveOnlyChanged = errors.New(errDirPrefix + "contains locally changed files")
-	errDirNotEmpty              = errors.New(errDirPrefix + "is not empty; the contents are probably ignored on that remote device, but not locally")
-	errNotAvailable             = errors.New("no connected device has the required version of this file")
-	errModified                 = errors.New("file modified but not rescanned; will try again later")
-	errUnexpectedDirOnFileDel   = errors.New("encountered directory when trying to remove file/symlink")
-	errIncompatibleSymlink      = errors.New("incompatible symlink entry; rescan with newer Syncthing on source")
-	contextRemovingOldItem      = "removing item to be replaced"
+	activity                  = newDeviceActivity()
+	errNoDevice               = errors.New("peers who had this file went away, or the file has changed while syncing. will retry later")
+	errDirPrefix              = "directory has been deleted on a remote device but "
+	errDirHasToBeScanned      = errors.New(errDirPrefix + "contains changed files, scheduling scan")
+	errDirHasIgnored          = errors.New(errDirPrefix + "contains ignored files (see ignore documentation for (?d) prefix)")
+	errDirNotEmpty            = errors.New(errDirPrefix + "is not empty; the contents are probably ignored on that remote device, but not locally")
+	errNotAvailable           = errors.New("no connected device has the required version of this file")
+	errModified               = errors.New("file modified but not rescanned; will try again later")
+	errUnexpectedDirOnFileDel = errors.New("encountered directory when trying to remove file/symlink")
+	errIncompatibleSymlink    = errors.New("incompatible symlink entry; rescan with newer Syncthing on source")
+	contextRemovingOldItem    = "removing item to be replaced"
 )
 
 type dbUpdateType int
@@ -1894,7 +1893,10 @@ func (f *sendReceiveFolder) deleteDirOnDisk(dir string, snap *db.Snapshot, scanC
 		return errDirHasIgnored
 	}
 	if hasReceiveOnlyChanged {
-		return errDirHasReceiveOnlyChanged
+		// Pretend we deleted the directory. It will be resurrected as a
+		// receive-only changed item on scan.
+		scanChan <- dir
+		return nil
 	}
 	if hasKnown {
 		return errDirNotEmpty

lib/model/model.go

@@ -452,6 +452,7 @@ func (m *model) restartFolder(from, to config.FolderConfiguration, cacheIgnoredF
 		l.Warnf("bug: folder restart cannot change ID %q -> %q", from.ID, to.ID)
 		panic("bug: folder restart cannot change ID")
 	}
+	folder := to.ID
 
 	// This mutex protects the entirety of the restart operation, preventing
 	// there from being more than one folder restart operation in progress
@@ -459,7 +460,7 @@ func (m *model) restartFolder(from, to config.FolderConfiguration, cacheIgnoredF
 	// because those locks are released while we are waiting for the folder
 	// to shut down (and must be so because the folder might need them as
 	// part of its operations before shutting down).
-	restartMut := m.folderRestartMuts.Get(to.ID)
+	restartMut := m.folderRestartMuts.Get(folder)
 	restartMut.Lock()
 	defer restartMut.Unlock()
 
@@ -477,13 +478,6 @@ func (m *model) restartFolder(from, to config.FolderConfiguration, cacheIgnoredF
 		errMsg = "restarting"
 	}
 
-	var fset *db.FileSet
-	if !to.Paused {
-		// Creating the fileset can take a long time (metadata calculation)
-		// so we do it outside of the lock.
-		fset = db.NewFileSet(to.ID, to.Filesystem(), m.db)
-	}
-
 	err := fmt.Errorf("%v folder %v", errMsg, to.Description())
 	m.stopFolder(from, err)
 	// Need to send CC change to both from and to devices.
@@ -492,8 +486,17 @@ func (m *model) restartFolder(from, to config.FolderConfiguration, cacheIgnoredF
 	m.fmut.Lock()
 	defer m.fmut.Unlock()
 
+	// Cache the (maybe) existing fset before it's removed by cleanupFolderLocked
+	fset := m.folderFiles[folder]
+
 	m.cleanupFolderLocked(from)
 	if !to.Paused {
+		if fset == nil {
+			// Create a new fset. Might take a while and we do it under
+			// locking, but it's unsafe to create fset:s concurrently so
+			// that's the price we pay.
+			fset = db.NewFileSet(folder, to.Filesystem(), m.db)
+		}
 		m.addAndStartFolderLocked(to, fset, cacheIgnoredFiles)
 	}
 	l.Infof("%v folder %v (%v)", infoMsg, to.Description(), to.Type)
@@ -1019,6 +1022,7 @@ func (m *model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterCon
 			// that might not exist until the config is committed.
 			w, _ := m.cfg.SetFolders(changedFolders)
 			w.Wait()
+			changed = true
 		}
 	}
 

lib/nat/service.go

@@ -85,7 +85,10 @@ func (s *Service) serve(ctx context.Context) {
 		case <-timer.C:
 		case <-s.processScheduled:
 			if !timer.Stop() {
-				<-timer.C
+				select {
+				case <-timer.C:
+				default:
+				}
 			}
 		case <-ctx.Done():
 			timer.Stop()