[NFS-Ganesha-Support] dbus-send AddExport is failing with "Error org.freedesktop.DBus.Error.InvalidArgs: Error finding exports: EXPORT(Export_Id=3, ...).FSAL(Name="VFS") because No such file or directory"

Thursday, 11 June 2020

Hi,
I am exploring dynamic export in NFS-Ganesha using dbus-send. I could compile NFS-Ganesha
with "USE_DBUS=ON" and could also start the ganesha.nfsd. The exports which were
present in my config file are properly up when I started ganesha.nfsd. But, I am not able
to add any new export. dbus-send command is always failing with below error

[root@localhost ~]# ls -lrt /home/
total 0
drwxr-xr-x. 3 root root  36 Jun  2 21:22 ganesha_nfs_v3
drwxr-xr-x. 2 root root   6 Jun 10 18:18 ganesha_1
drwxr-xr-x. 8 root root 199 Jun 11 15:00 ganesha_nfs_v4

[root@localhost ~]#  sudo dbus-send --print-reply --system --dest=org.ganesha.nfsd
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.AddExport
string:/etc/ganesha/export.conf 'string:EXPORT(Export_Id=3,
Path="/home/ganesha_1/", Pseudo="/home/ganesha_1/",
Transports="TCP").FSAL(Name="VFS")'
Error org.freedesktop.DBus.Error.InvalidArgs: Error finding exports: EXPORT(Export_Id=3,
Path="/home/ganesha_1/", Pseudo="/home/ganesha_1/",
Transports="TCP").FSAL(Name="VFS") because No such file or directory
[root@localhost ~]#

Messages in "/var/log/ganesha.log":
11/06/2020 23:44:23 : epoch 5ee2736e : localhost.localdomain :
ganesha.nfsd-26823[dbus_heartbeat] gsh_export_addexport :EXPORT :CRIT :Error finding
exports: EXPORT(Export_Id=3, Path="/home/ganesha_1/",
Pseudo="/home/ganesha_1/",
Transports="TCP").FSAL(Name="VFS") because No such file or directory
11/06/2020 23:44:23 : epoch 5ee2736e : localhost.localdomain :
ganesha.nfsd-26823[dbus_heartbeat] dbus_message_entrypoint :DBUS :MAJ :Method (AddExport)
on (org.ganesha.nfsd.exportmgr) failed: name = (org.freedesktop.DBus.Error.InvalidArgs),
message = (Error finding exports: EXPORT(Export_Id=3, Path="/home/ganesha_1/",
Pseudo="/home/ganesha_1/",
Transports="TCP").FSAL(Name="VFS") because No such file or directory)
11/06/2020 23:46:06 : epoch 5ee2736e : localhost.localdomain :
ganesha.nfsd-26823[dbus_heartbeat] nfs_health :DBUS :WARN :Health status is unhealthy. enq
new: 5445, old: 5441; deq new: 5441, old: 5441

Can someone please help on this?

I have followed the steps mentioned in:
https://github.com/nfs-ganesha/nfs-ganesha/wiki/Dbusinterface

[root@localhost ~]# ps -ef | grep nfs
root     26823     1  0 23:39 ?        00:00:00 /root/build_dir_v3_stable/ganesha.nfsd -f
/etc/ganesha/ganesha.conf
root     26854 25589  0 23:39 pts/1    00:00:00 grep --color=auto nfs
[root@localhost ~]# cat /var/log/ganesha.log | grep dbus
11/06/2020 23:39:50 : epoch 5ee2736e : localhost.localdomain : ganesha.nfsd-26823[main]
nfs_Start_threads :THREAD :EVENT :gsh_dbusthread was started successfully
[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
/home/ganesha_nfs_v3 (everyone)
/home/ganesha_nfs_v4 (everyone)
[root@localhost ~]#

[root@localhost ~]# cat /etc/ganesha/ganesha.conf
## These are core parameters that affect Ganesha as a whole.
NFS_CORE_PARAM {
        ## Configure the protocols that Ganesha will listen for.  This is a hard
        ## limit, as this list determines which sockets are opened.  This list
        ## can be restricted per export, but cannot be expanded.
        Protocols = 3, 4;

        # Enable NLM (network lock manager protocol)
        Enable_NLM = false;

        # lockmgr port
        NLM_PORT = 45075;

        Enable_RQUOTA = false;
}

## These are defaults for exports.  They can be overridden per-export.
EXPORT_DEFAULTS {
        ## Restrict the protocols that may use this export.  This cannot allow
        ## access that is denied in NFS_CORE_PARAM.
        Protocols = 3, 4;

        ## Access type for clients.  Default is None, so some access must be
        ## given either here or in the export itself.
        Access_Type = RW;

        ## Whether to squash various users.
        Squash = No_Root_Squash;

        ## Allowed security types for this export
        Sectype = sys,krb5,krb5i,krb5p;
}

## Configure settings for the object handle cache
MDCACHE {
        ## The point at which object cache entries will start being reused.
        Entries_HWMark = 100000;
}

## Configure logging.  Default is to log to Syslog.  Basic logging can also be
## configured from the command line
LOG {
        ## Default log level for all components
        Default_Log_Level = EVENT;
        #Default_Log_Level = DEBUG;

        ## Configure per-component log levels.
        Components {
                FSAL = INFO;
                NFS4 = EVENT;
                NFS3 = EVENT;
        }

        ## Where to log
        Facility {
                name = FILE;
                destination = "/var/log/ganesha.log";
                enable = active;
        }
}

NFS_KRB5 {
        Active_krb5 = false;
}

%include "/etc/ganesha/export.conf"

[root@localhost ~]# cat /etc/ganesha/export.conf
## Configure an export for some file tree
EXPORT {
        ## Export Id (mandatory, each EXPORT must have a unique Export_Id)
        Export_Id = 1;

        ## Exported path (mandatory)
        Path = /home/ganesha_nfs_v3/;

        ## Pseudo Path (required for NFSv4 or if mount_path_pseudo = true)
        Pseudo = /home/ganesha_nfs_v3/;

        Transports = "TCP";

        ## Exporting FSAL
        FSAL {
                Name = VFS;
        }
}

EXPORT {
        ## Export Id (mandatory, each EXPORT must have a unique Export_Id)
        Export_Id = 2;

        ## Exported path (mandatory)
        Path = /home/ganesha_nfs_v4/;

        ## Pseudo Path (required for NFSv4 or if mount_path_pseudo = true)
        Pseudo = /home/ganesha_nfs_v4/;

        Transports = "TCP";

        ## Exporting FSAL
        FSAL {
                Name = VFS;
        }
}

Just as a data point, DisplayExport and ShowExports are running fine.

[root@localhost ~]# dbus-send --print-reply --system --dest=org.ganesha.nfsd
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.DisplayExport uint16:1
method return time=1591899610.781101 sender=:1.175 -> destination=:1.178 serial=623
reply_serial=2
   uint16 1
   string "/home/ganesha_nfs_v3"
   string "/home/ganesha_nfs_v3"
   string ""
   array [
   ]
[root@localhost ~]# dbus-send --print-reply --system --dest=org.ganesha.nfsd
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.ShowExports
method return time=1591899620.339869 sender=:1.175 -> destination=:1.179 serial=633
reply_serial=2
   struct {
      uint64 1591898990
      uint64 170367428
   }
   array [
      struct {
         uint16 1
         string "/home/ganesha_nfs_v3"
         boolean true
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         struct {
            uint64 1591899616
            uint64 118026535
         }
      }
      struct {
         uint16 2
         string "/home/ganesha_nfs_v4"
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean true
         boolean false
         boolean false
         struct {
            uint64 1591899006
            uint64 449489142
         }
      }
      struct {
         uint16 0
         string "/"
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         boolean false
         struct {
            uint64 1591898990
            uint64 143657141
         }
      }
   ]
[root@localhost ~]#

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[NFS-Ganesha-Support] dbus-send AddExport is failing with "Error org.freedesktop.DBus.Error.InvalidArgs: Error finding exports: EXPORT(Export_Id=3, ...).FSAL(Name="VFS") because No such file or directory"