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_attr.go

@@ -20,12 +20,12 @@ func (wfs *WFS) GetAttr(cancel <-chan struct{}, input *fuse.GetAttrIn, out *fuse
 	_, _, entry, status := wfs.maybeReadEntry(inode)
 	if status == fuse.OK {
 		out.AttrValid = 1
-		wfs.setAttrByPbEntry(&out.Attr, inode, entry)
+		wfs.setAttrByPbEntry(&out.Attr, inode, entry, true)
 		return status
 	} else {
 		if fh, found := wfs.fhmap.FindFileHandle(inode); found {
 			out.AttrValid = 1
-			wfs.setAttrByPbEntry(&out.Attr, inode, fh.entry.GetEntry())
+			wfs.setAttrByPbEntry(&out.Attr, inode, fh.entry.GetEntry(), true)
 			out.Nlink = 0
 			return fuse.OK
 		}
@@ -75,7 +75,7 @@ func (wfs *WFS) SetAttr(cancel <-chan struct{}, input *fuse.SetAttrIn, out *fuse
 			// set the new chunks and reset entry cache
 			entry.Chunks = chunks
 			if fh != nil {
-				fh.entryViewCache = nil
+				fh.entryChunkGroup.SetChunks(chunks)
 			}
 		}
 		entry.Attributes.Mtime = time.Now().Unix()
@@ -114,7 +114,11 @@ func (wfs *WFS) SetAttr(cancel <-chan struct{}, input *fuse.SetAttrIn, out *fuse
 	}
 
 	out.AttrValid = 1
-	wfs.setAttrByPbEntry(&out.Attr, input.NodeId, entry)
+	size, includeSize := input.GetSize()
+	if includeSize {
+		out.Attr.Size = size
+	}
+	wfs.setAttrByPbEntry(&out.Attr, input.NodeId, entry, !includeSize)
 
 	if fh != nil {
 		fh.dirtyMetadata = true
@@ -139,12 +143,14 @@ func (wfs *WFS) setRootAttr(out *fuse.AttrOut) {
 	out.Nlink = 1
 }
 
-func (wfs *WFS) setAttrByPbEntry(out *fuse.Attr, inode uint64, entry *filer_pb.Entry) {
+func (wfs *WFS) setAttrByPbEntry(out *fuse.Attr, inode uint64, entry *filer_pb.Entry, calculateSize bool) {
 	out.Ino = inode
 	if entry.Attributes != nil && entry.Attributes.Inode != 0 {
 		out.Ino = entry.Attributes.Inode
 	}
-	out.Size = filer.FileSize(entry)
+	if calculateSize {
+		out.Size = filer.FileSize(entry)
+	}
 	if entry.FileMode()&os.ModeSymlink != 0 {
 		out.Size = uint64(len(entry.Attributes.SymlinkTarget))
 	}
@@ -194,7 +200,7 @@ func (wfs *WFS) outputPbEntry(out *fuse.EntryOut, inode uint64, entry *filer_pb.
 	out.Generation = 1
 	out.EntryValid = 1
 	out.AttrValid = 1
-	wfs.setAttrByPbEntry(&out.Attr, inode, entry)
+	wfs.setAttrByPbEntry(&out.Attr, inode, entry, true)
 }
 
 func (wfs *WFS) outputFilerEntry(out *fuse.EntryOut, inode uint64, entry *filer.Entry) {