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/page_writer/upload_pipeline_test.go

@@ -31,14 +31,14 @@ func writeRange(uploadPipeline *UploadPipeline, startOff, stopOff int64) {
 	p := make([]byte, 4)
 	for i := startOff / 4; i < stopOff/4; i += 4 {
 		util.Uint32toBytes(p, uint32(i))
-		uploadPipeline.SaveDataAt(p, i, false)
+		uploadPipeline.SaveDataAt(p, i, false, 0)
 	}
 }
 
 func confirmRange(t *testing.T, uploadPipeline *UploadPipeline, startOff, stopOff int64) {
 	p := make([]byte, 4)
 	for i := startOff; i < stopOff/4; i += 4 {
-		uploadPipeline.MaybeReadDataAt(p, i)
+		uploadPipeline.MaybeReadDataAt(p, i, 0)
 		x := util.BytesToUint32(p)
 		if x != uint32(i) {
 			t.Errorf("expecting %d found %d at offset [%d,%d)", i, x, i, i+4)