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_read.go

@@ -1,7 +1,8 @@
 package mount
 
 import (
-	"context"
+	"bytes"
+	"fmt"
 	"io"
 
 	"github.com/hanwen/go-fuse/v2/fuse"
@@ -40,8 +41,8 @@ func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse
 		return nil, fuse.ENOENT
 	}
 
-	fh.orderedMutex.Acquire(context.Background(), 1)
-	defer fh.orderedMutex.Release(1)
+	fh.Lock()
+	defer fh.Unlock()
 
 	offset := int64(in.Offset)
 	totalRead, err := readDataByFileHandle(buff, fh, offset)
@@ -50,6 +51,23 @@ func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse
 		return nil, fuse.EIO
 	}
 
+	if IsDebugFileReadWrite {
+		// print(".")
+		mirrorData := make([]byte, totalRead)
+		fh.mirrorFile.ReadAt(mirrorData, offset)
+		if bytes.Compare(mirrorData, buff[:totalRead]) != 0 {
+
+			againBuff := make([]byte, len(buff))
+			againRead, _ := readDataByFileHandle(buff, fh, offset)
+			againCorrect := bytes.Compare(mirrorData, againBuff[:againRead]) == 0
+			againSame := bytes.Compare(buff[:totalRead], againBuff[:againRead]) == 0
+
+			fmt.Printf("\ncompare %v [%d,%d) size:%d againSame:%v againCorrect:%v\n", fh.mirrorFile.Name(), offset, offset+totalRead, totalRead, againSame, againCorrect)
+			//fmt.Printf("read mirrow data: %v\n", mirrorData)
+			//fmt.Printf("read actual data: %v\n", buff[:totalRead])
+		}
+	}
+
 	return fuse.ReadResultData(buff[:totalRead]), fuse.OK
 }
 
@@ -59,9 +77,9 @@ func readDataByFileHandle(buff []byte, fhIn *FileHandle, offset int64) (int64, e
 	fhIn.lockForRead(offset, size)
 	defer fhIn.unlockForRead(offset, size)
 
-	n, err := fhIn.readFromChunks(buff, offset)
+	n, tsNs, err := fhIn.readFromChunks(buff, offset)
 	if err == nil || err == io.EOF {
-		maxStop := fhIn.readFromDirtyPages(buff, offset)
+		maxStop := fhIn.readFromDirtyPages(buff, offset, tsNs)
 		n = max(maxStop-offset, n)
 	}
 	if err == io.EOF {