more solid weed mount (#4089)

* compare chunks by timestamp

* fix slab clearing error

* fix test compilation

* move oldest chunk to sealed, instead of by fullness

* lock on fh.entryViewCache

* remove verbose logs

* revert slat clearing

* less logs

* less logs

* track write and read by timestamp

* remove useless logic

* add entry lock on file handle release

* use mem chunk only, swap file chunk has problems

* comment out code that maybe used later

* add debug mode to compare data read and write

* more efficient readResolvedChunks with linked list

* small optimization

* fix test compilation

* minor fix on writer

* add SeparateGarbageChunks

* group chunks into sections

* turn off debug mode

* fix tests

* fix tests

* tmp enable swap file chunk

* Revert "tmp enable swap file chunk"

This reverts commit 985137ec472924e4815f258189f6ca9f2168a0a7.

* simple refactoring

* simple refactoring

* do not re-use swap file chunk. Sealed chunks should not be re-used.

* comment out debugging facilities

* either mem chunk or swap file chunk is fine now

* remove orderedMutex  as *semaphore.Weighted

not found impactful

* optimize size calculation for changing large files

* optimize performance to avoid going through the long list of chunks

* still problems with swap file chunk

* rename

* tiny optimization

* swap file chunk save only successfully read data

* fix

* enable both mem and swap file chunk

* resolve chunks with range

* rename

* fix chunk interval list

* also change file handle chunk group when adding chunks

* pick in-active chunk with time-decayed counter

* fix compilation

* avoid nil with empty fh.entry

* refactoring

* rename

* rename

* refactor visible intervals to *list.List

* refactor chunkViews to *list.List

* add IntervalList for generic interval list

* change visible interval to use IntervalList in generics

* cahnge chunkViews to *IntervalList[*ChunkView]

* use NewFileChunkSection to create

* rename variables

* refactor

* fix renaming leftover

* renaming

* renaming

* add insert interval

* interval list adds lock

* incrementally add chunks to readers

Fixes:
1. set start and stop offset for the value object
2. clone the value object
3. use pointer instead of copy-by-value when passing to interval.Value
4. use insert interval since adding chunk could be out of order

* fix tests compilation

* fix tests compilation

weed/mount/weedfs_file_sync.go

@@ -89,8 +89,8 @@ func (wfs *WFS) Fsync(cancel <-chan struct{}, in *fuse.FsyncIn) (code fuse.Statu
 }
 
 func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
-	fh.orderedMutex.Acquire(context.Background(), 1)
-	defer fh.orderedMutex.Release(1)
+	fh.Lock()
+	defer fh.Unlock()
 
 	// flush works at fh level
 	fileFullPath := fh.FullPath()
@@ -145,9 +145,9 @@ func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
 		}
 
 		glog.V(4).Infof("%s set chunks: %v", fileFullPath, len(entry.GetChunks()))
-		for i, chunk := range entry.GetChunks() {
-			glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fileFullPath, i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
-		}
+		//for i, chunk := range entry.GetChunks() {
+		//	glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fileFullPath, i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
+		//}
 
 		manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.GetChunks())
 
@@ -158,6 +158,7 @@ func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
 			glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
 		}
 		entry.Chunks = append(chunks, manifestChunks...)
+		fh.entryChunkGroup.SetChunks(entry.Chunks)
 
 		wfs.mapPbIdFromLocalToFiler(request.Entry)
 		defer wfs.mapPbIdFromFilerToLocal(request.Entry)
@@ -181,5 +182,9 @@ func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
 		return fuse.EIO
 	}
 
+	if IsDebugFileReadWrite {
+		fh.mirrorFile.Sync()
+	}
+
 	return fuse.OK
 }