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NAME

volscan - Produces detailed information about AFS volumes

SYNOPSIS

DESCRIPTION

The volscan command displays volume meta-data stored on AFS file servers. The output is intended for debugging purposes and is meaningful to someone familiar with the internal structure of AFS volumes. The volscan command must be issued directly on a file server machine as the root superuser. The volscan command does not modify volume information.

The volscan command will produce output for all the volumes on the file server by default. To display output for the volumes in one partition only, include the -partition argument. To display output for one volume only, include the -partition and -volumeid arguments.

The volscan command will produce output for read-write, read-only, and backup volumes by default. To limit the output to particular types of volumes, include the -type argument with one or more volume types (rw, ro, bk).

The volscan command will produce output for each type of vnode object found in the volumes scanned. The command will output information for files, directories, AFS mount points, and symbolic links by default. The volscan command can output access control lists (ACLs) for directory vnode objects scanned. To limit the output to particular types of vnode objects, or to output access control lists (ACLs), include the -find argument with one or more object types (file, dir, mount, symlink, acl).

The output of the volscan command is tabular. The output consists of an optional heading line, followed by zero or more lines of delimiter separated values. By default, the output values are the file server hostname (host), the object type (desc), the vnode FID (fid), the vnode data version (dv), and the directory path (path). The directory path is relative to the root directory of the volume. When acl is included as an argument to -find, the default output values also include the user/group id (aid) and the access rights (arights). To specify different output values, include the -output argument with one or more column names. See OUTPUT for the column names.

Values are space delimited by default. To use a different delimiter character, include the -delim argument. Include the -noheading flag to suppress the output heading line.

OPTIONS

-checkout

Checkout the specified volume from the running file server. This ensures that the file server or other processes will not be modifying volume meta-data at the same time we are trying to read it, leading to invalid or incorrect results.

-partition <partition name or id>+

Specifies the partition that houses each volume for which to produce output. Use the format /vicepxx or xx, where xx is one or two lowercase letters.

This argument can be omitted if the current working directory is the mount location for an AFS server partition. If the current working directory is not the mount location for an AFS server partition, the command produces output for every volume on all local AFS server partitions.

-volumeid <volume id>+

Specifies the ID number of one volume for which to produce output. The -partition argument must be provided along with this one unless the current working directory is the mount location for the AFS server partition that houses the volume.

-type <Volume types: rw, ro, bk>+

Limit the volumes to be scanned by read/write, read-only, or backup volumes. Specify one or more of rw<rw>, ro, bk. The volscan command will scan all types of volumes by default.

-find <Objects to find: file, dir, mount, symlink, acl>+

Output the specified volume objects within the scanned volumes. Specify one or more of file, dir, mount, symlink, acl. By default, the volscan command will find file, dir, mount, symlink objects.

-output <Column>+

The -output argument specifies the output columns produced by the volscan command. See the OUTPUT section for <Column> names.

The default output columns are the file server hostname (host), the object type (desc), the vnode FID (fid), the vnode data version (dv), and the directory path (path). When acl is included as an argument to -find, the default output values also include the user/group id (aid) and the access rights (arights).

-delim <Output field delimiter>

The -delim argument specifies the record delimiter character. The default value is the space (' ') character.

-noheading

The -noheading flags prevents the volscan command from printing the heading line.

-ignore-magic

Display vnodes even with incorrect vnode magic numbers. By default, the volscan command will not process vnodes objects with incorrect vnode magic numbers.

-help

Prints the online help for this command. All other valid options are ignored.

OUTPUT

The following column names are valid for the -output argument:

host

The hostname of the current machine. This field may be useful when combining the volscan output from several hosts.

desc

The descriptive name of the type of volume object. Values are file, dir, symlink, mount, and acl.

vid

The numeric volume id.

offset

The vnode index table offset.

vtype

The volume type. Values are RW, RO, BK.

vname

The volume name.

part

The partition path.

partid

The AFS partition id.

fid

The AFS File Identifier (FID).

path

The directory path and filename. The path is relative to the volume root directory.

target

The symlink target. Empty if the vnode is not a symlink.

mount

The mount point value. Empty if the vnode is not a mount point. See "fs lsmount" for the mount point value format.

mtype

The mount point type. Empty if the vnode is not a mount point. Values are '#' for regular mount points and '%' for read-write mount points.

mcell

The mount point target cell. Empty if the vnode is not a cellular mount point.

mvol

The mount point target volume. Empty if the vnode is not a mount point.

aid

Access entry user or group id. Empty if the object is not an ACL.

arights

Access entry rights. Empty if the object is not an ACL.

vntype

The vnode type. Values are file, dir, symlink.

cloned

The vnode cloned flag. Values are y or n.

mode

The vnode Unix mode bits, as an octal number.

links

The vnode link count.

length

The vnode data length.

uniq

The vnode uniquifier number.

dv

The vnode data version number.

inode

The vnode inode number. This is an internally used number on namei file servers.

namei

The vnode namei path.

modtime

The vnode modification time.

author

The vnode author user id.

owner

The vnode Unix owner id.

parent

The parent directory vnode number.

magic

The vnode magic number.

lock

The vnode lock count and time. The format is <count>.<time>, where <time> is the epoch time.

smodtime

The vnode server modify time.

group

The vnode unix group id.

EXAMPLES

The following command displays the FID, data version, and relative path for each vnode object in a volume.

    # volscan -partition a -volumeid 536870916
    HOST DESC FID DV PATH
    fs1 dir 536870916.1.1 3 /
    fs1 mount 536870916.2.2 0 /test
    fs1 mount 536870916.4.3 0 /xyzzy

The following command displays the AFS mount points in all the read-write volumes on the file server. For each mount point the following is shown: the volume containing the mount point, the type of mount point, regular (#) or read-write (%), the target cell (or - if not a cellular mount point), the name of the target volume, the path of the mount point within the volume (relative to the volume root directory).

    # volscan -type rw -find mount -output vid mtype mcell mvol path -noheading
    536870915 # - test /test
    536870912 # example.com root.cell /example.com
    536870912 % example.com root.cell /.example.com

The following command displays access control lists for a volume.

    # volscan -partition a -volumeid 536870918 -find acl \
        -output fid aid arights path -delim : -noheading
    536870918.1.1:-204:+rlidwka:/
    536870918.1.1:-101:+rl:/
    536870918.3.3:-204:+rlidwka:/xyzzy
    536870918.3.3:-101:+rl:/xyzzy
    536870918.3.3:1027:+rlidwk:/xyzzy

The following commands find files which have unix permissions bit 04000 (suid) or 02000 (sgid):

    # volscan -find file -output fid mode -noheading | \
       perl -lane 'print if oct($F[1]) & 06000'

PRIVILEGE REQUIRED

The issuer must be logged in as the local superuser root.

SEE ALSO

volinfo(8), vldb.DB0(5), volserver(8)

COPYRIGHT

Copyright 2014 Sine Nomine Associates. All Rights Reserved.

This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Michael Meffie for OpenAFS.

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