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_lseek.go

@@ -1,7 +1,6 @@
 package mount
 
 import (
-	"context"
 	"syscall"
 
 	"github.com/hanwen/go-fuse/v2/fuse"
@@ -36,8 +35,8 @@ func (wfs *WFS) Lseek(cancel <-chan struct{}, in *fuse.LseekIn, out *fuse.LseekO
 	}
 
 	// lock the file until the proper offset was calculated
-	fh.orderedMutex.Acquire(context.Background(), 1)
-	defer fh.orderedMutex.Release(1)
+	fh.Lock()
+	defer fh.Unlock()
 	fh.entryLock.Lock()
 	defer fh.entryLock.Unlock()
 
@@ -56,17 +55,8 @@ func (wfs *WFS) Lseek(cancel <-chan struct{}, in *fuse.LseekIn, out *fuse.LseekO
 		return ENXIO
 	}
 
-	// refresh view cache if necessary
-	if fh.entryViewCache == nil {
-		var err error
-		fh.entryViewCache, err = filer.NonOverlappingVisibleIntervals(fh.wfs.LookupFn(), fh.entry.GetChunks(), 0, fileSize)
-		if err != nil {
-			return fuse.EIO
-		}
-	}
-
 	// search chunks for the offset
-	found, offset := searchChunks(fh, offset, fileSize, in.Whence)
+	found, offset := fh.entryChunkGroup.SearchChunks(offset, fileSize, in.Whence)
 	if found {
 		out.Offset = uint64(offset)
 		return fuse.OK
@@ -82,30 +72,3 @@ func (wfs *WFS) Lseek(cancel <-chan struct{}, in *fuse.LseekIn, out *fuse.LseekO
 
 	return fuse.OK
 }
-
-// searchChunks goes through all chunks to find the correct offset
-func searchChunks(fh *FileHandle, offset, fileSize int64, whence uint32) (found bool, out int64) {
-	chunkViews := filer.ViewFromVisibleIntervals(fh.entryViewCache, offset, fileSize)
-
-	for _, chunkView := range chunkViews {
-		if offset < chunkView.LogicOffset {
-			if whence == SEEK_HOLE {
-				out = offset
-			} else {
-				out = chunkView.LogicOffset
-			}
-
-			return true, out
-		}
-
-		if offset >= chunkView.LogicOffset && offset < chunkView.Offset+int64(chunkView.Size) && whence == SEEK_DATA {
-			out = offset
-
-			return true, out
-		}
-
-		offset += int64(chunkView.Size)
-	}
-
-	return
-}