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smbinfo - Man Page

Userspace helper to display SMB-specific file information for the Linux SMB client file system (CIFS)


smbinfo [-v] [-h] [-V] {command} {file system object}


This tool is part of the cifs-utils suite.

smbinfo is a userspace helper program for the Linux SMB client file system (CIFS). It is intended to display SMB-specific file informations such as Security Descriptors and Quota.

This tool works by making an CIFS_QUERY_INFO IOCTL call to the Linux SMB client which in turn issues a SMB Query Info request and returns the result. This differs from getcifsacl which uses extended file attributes.



Print version number and exit.


Verbose output.


Print help explaining the command line options.


fileaccessinfo: Prints the FileAccessInformation class

filealigninfo: Prints the FileAlignmentInformation class

fileallinfo: Prints the FileAllInformation class

filebasicinfo: Prints the FileBasicInformation class

fileeainfo: Prints the FileEaInformation class

filefsfullsizeinfo: Prints the FileFsFullSizeInformation class

fileinternalinfo: Prints the FileInternalInformation class

filemodeinfo: Prints the FileModeInformation class

filepositioninfo: Prints the FilePositionInformation class

filestandardinfo: Prints the FileStandardInformation class

filestreaminfo: Prints the FileStreamInformation class

fsctl-getobjid: Prints the ObjectID

getcompression: Prints the compression setting for the file.

setcompression -c <no|default|lznt1>: Sets the compression setting for the file.

list-snapshots: Lists the previous versions of the volume that backs this file

quota: Print the quota for the volume in the form - SID Length - Change Time - Quota Used - Quota Threshold - Quota Limit - SID

secdesc: Print the security descriptor in the form - Revision - Control - Owner SID - Group SID - ACL - File types - File flags

keys: Dump session id, encryption keys and decryption keys so that the SMB3 traffic of this mount can be decryped e.g. via wireshark (requires root).


Kernel support for smbinfo utilities requires the CIFS_QUERY_INFO IOCTL which was initially introduced in the 4.20 kernel and is only implemented for mount points using SMB2 or above (see mount.cifs(8) vers option).

See Also

mount.cifs(8), getcifsacl(1)


Ronnie Sahlberg wrote the smbinfo program.

The Linux CIFS Mailing list is the preferred place to ask questions regarding these programs.

Referenced By