[NFS-Ganesha-Support] Re: 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

I think the problem is that you are trying to provide the export block in the dbus command
when what the dbus command specifies is a file (on the Ganesha server node) that contains
the export block to be added, and an expression to indicate which export block in that
file to use to add from. I played with this at one time, but I don't seem to have kept
notes on exactly what I did. Perhaps someone more familiar with the add export dbus
interface could give more help.

Optionally, another way to add exports it to edit the config file that is used at start up
and then send SIGHUP to the ganesha.nfsd process. Ganesha will then re-read the config
file (in it's entirety) and process LOG, EXPORT, and EXPORT_DEFAULTS blocks. It will
add new exports and update existing ones. If an export is no longer in the config file, it
will be removed (depending on the specifics, that may cause problems, but in simple
configurations it should work).

Frank

...
 -----Original Message-----
 From: roshandkolhe(a)gmail.com [mailto:roshandkolhe@gmail.com]
 Sent: Thursday, June 11, 2020 11:24 AM
 To: support(a)lists.nfs-ganesha.org
 Subject: [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"

 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] Re: 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"