Ceph » CephFS

I have noticed that some inodes in the client have long-lasting dirty caps, and they are not reclaimed even during MDS recall caps, resulting in the occurrence of MDS_CLIENT_RECALL messages in the system. It was found that when an inode holds Fx caps and setattr is performed on that inode to modify mtime, it acquires dirty caps. However, these dirty caps may remain unflushed for an extended period. Should the FUSE client flush the dirty caps after setattr? I have observed that NFS-Ganesha, after calling setattr, actively invokes the ll_sync_inode function to flush the dirty caps.

client cache dump info:

{
            "path": "#0x1000023d4dd",
            "disconnected": 1,
            "ino": "0x1000023d4dd",
            "snapid": "head",
            "ctime": "2023-10-08T14:40:53.467607+0800",
            "btime": "2023-10-08T14:40:07.724250+0800",
            "mode": "040755",
            "uid": 0,
            "gid": 0,
            "nlink": 1,
            "size": 0,
            "max_size": 0,
            "truncate_seq": 1,
            "truncate_size": 18446744073709551615,
            "mtime": "212121.000000",
            "atime": "212121.000000",
            "time_warp_seq": 1,
            "change_attr": 2,
            "layout": {
                "stripe_unit": 0,
                "stripe_count": 0,
                "object_size": 0,
                "pool_id": -1,
                "pool_ns": "" 
            },
            "dir_layout": {
                "dir_hash": 2,
                "unused1": 0,
                "unused2": 0,
                "unused3": 0
            },
            "complete": false,
            "ordered": false,
            "version": 12,
            "xattr_version": 1,
            "flags": 0,
            "dir_hashed": 0,
            "dir_replicated": 0,
            "caps": [
        {
                    "auth": 1,
                    "mds": 0,
                    "ino": "0x1000023d4dd",
                    "cap_id": 1,
                    "issued": "pAsLsXsFsx",
                    "wanted": "AsLsXsFsx",
                    "seq": 11,
                    "issue_seq": 11,
                    "mseq": 0,
                    "gen": 0
                }
            ],
            "auth_cap": 0,
            "dirty_caps": "Fx",
            "shared_gen": 1,
            "cache_gen": 0,
            "hold_caps_until": "0.000000",
            "snaprealm": {
                "ino": "0x1",
                "nref": 12,
                "created": "0",
                "seq": "1",
                "parent_ino": "0x0",
                "parent_since": "1",
                "prior_parent_snaps": [],
                "my_snaps": [],
                "children": []
            },
            "reported_size": 0,
            "ref": 1,
            "ll_ref": 0
        }

ENV:
FUSE client: "ceph_version": "ceph version 15.2.17 (8a82819d84cf884bd39c17e3236e0632ac146dc4) octopus (stable)"