X wcfs: Switch sticky=true everywhere

ref:Zzj45iDT1E4PakvG@deca.navytux.spb.ru

wcfs/wcfs.go

@@ -2596,13 +2596,19 @@ func (root *Root) lookup(name string, fctx *fuse.Context) (_ *Head, err error) {
 		// echo 2 >/proc/sys/vm/drop_caches	(root)
 		// mount -i -oremount $mntpt		(root ?)  (shrinks dcache)
 		// notify invalidate dentry from inside fs
-		fsNode: newFSNode(&fsOptions{Sticky: false}), // TODO + Head.OnForget() -> del root.revTab[]
+		// XXX sticky=false -> bad - LOOKUP by client can fail  (see details for revX/bigfile vvv)
+//		fsNode: newFSNode(&fsOptions{Sticky: false}), // TODO + Head.OnForget() -> del root.revTab[]
+		fsNode: newFSNode(&fsOptions{Sticky: true}), // TODO + Head.OnForget() -> del root.revTab[]
 		rev:    rev,
 		zconn:  zconnRev, // TODO + Head.OnForget() -> release zconn (= abort zconn.TxnCtx)
 	}
 
 	bfdir := &BigFileDir{
-		fsNode:  newFSNode(&fsOptions{Sticky: false}),	// TODO + BigFileDir.OnForget()
+		// XXX sticky=false -> bad  - LOOKUP by client can fail
+		//     pin #788 @03fcb677f0cab3e2: expect "ack"; got "nak: _remmapblk #788 @03fcb677f0cab3e2: open /dev/shm/wcfs/1439df02dfcc41ab9dfb68e7ac4ad615f3b7d46e/@03fcb677f0cab3e2/bigfile/0000000006efe23b: No such file or directory
+		//     ref:Zzj45iDT1E4PakvG@deca.navytux.spb.ru
+//		fsNode:  newFSNode(&fsOptions{Sticky: false}),	// TODO + BigFileDir.OnForget()
+		fsNode:  newFSNode(&fsOptions{Sticky: true}),	// TODO + BigFileDir.OnForget()
 		head:    revDir,
 		fileTab: make(map[zodb.Oid]*BigFile),
 		δFtail:  nil, // δFtail not needed/used for @revX/
@@ -2668,7 +2674,10 @@ func (head *Head) bigfopen(ctx context.Context, oid zodb.Oid) (_ *BigFile, err e
 	}
 
 	f := &BigFile{
-		fsNode:    newFSNode(&fsOptions{Sticky: false}), // TODO + BigFile.OnForget -> del .head.bfdir.fileTab[]
+		// XXX we currently do not handle denry-cache pressure right
+		//     (see detail in @revX/bigfile lookup)
+//		fsNode:    newFSNode(&fsOptions{Sticky: false}), // TODO + BigFile.OnForget -> del .head.bfdir.fileTab[]
+		fsNode:    newFSNode(&fsOptions{Sticky: true}), // TODO + BigFile.OnForget -> del .head.bfdir.fileTab[]
 		head:      head,
 		zfile:     zfile,
 		blksize:   blksize,