Technical data

SunOS 5.5 File Systems volfs(7FS)
NAME volfs − Volume Management file system
DESCRIPTION volfs is the Volume Management file system rooted at root_dir. The default location for
root-dir is /vol, but this can be overridden using the −d option of vold (see vold(1M)).
This file system is maintained by the Volume Managementdaemon, vold, and will be
considered to be /vol for this description.
Media can be accessed in a logical manner (no association with a particular piece of
hardware), or a physical manner (associated with a particular piece of hardware).
Logical names for media are referred to through /vol/dsk and /vol/rdsk. /vol/dsk pro-
vides block access to random access devices. /vol/rdsk provides character access to ran-
dom access devices.
The /vol/rdsk and /vol/dsk directories are mirrors of one another. Any change to one is
reflected in the other immediately. The dev_t for a volume will be the same for both the
block and character device.
The default permissions for /vol are mode=0555, owner=root, group=sys. The default
permissions for /vol/dsk and /vol/rdsk are mode=01777, owner=root, group=sys.
Physical references to media are obtained through /vol/dev. This hierarchy reflects the
structure of the /dev name space. The default permissions for all directories in the
/vol/dev hierarchy are mode=0555, owner=root, group=sys.
mkdir(2), rmdir(2), unlink(2) (rm), symlink(2) (ln −s), link(2) (ln), and rename(2) (mv)
are supported, subject to normal file and directory permissions.
The following system calls are not supported in the /vol filesystem: creat(2), only when
creating a file, and mknod(2).
If the media does not contain file systems that can be automatically mounted by
rmmount(1M), users can gain access to the media through the following /vol locations.
Location State of Media
/vol/dev/diskette0/unnamed_floppy formatted unnamed floppy-block device access
/vol/dev/rdiskette0/unnamed_floppy formatted unnamed floppy-raw device access
/vol/dev/diskette0/unlabeled unlabeled floppy-block device access
/vol/dev/rdiskette0/unlabeled unlabeled floppy-raw device access
/vol/dev/dsk/c0t6/unnamed_cdrom CD-ROM-block device access
/vol/dev/rdsk/c0t6/unnamed_cdrom CD-ROM-raw device access
For more information on the location of CD-ROM and floppy media, see System Adminis-
tration Guide, Volume I or rmmount(1M).
Partitions Some media supports the concept of a partition. If the label identifiespartitions on the
media, the name of the media will become a directory with partitions under it. Only
valid partitions are represented. Partitions cannot be moved out of a directory.
modified 8 Feb 1995 7FS-395