mount_tmpfs(8) - NetBSD Manual Pages

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MOUNT_TMPFS(8)          NetBSD System Manager's Manual          MOUNT_TMPFS(8)


NAME
mount_tmpfs -- mount an efficient memory file system
SYNOPSIS
mount_tmpfs [-g group] [-m mode] [-n nodes] [-o options] [-s size] [-u user] tmpfs mount_point
DESCRIPTION
The mount_tmpfs command attaches an instance of the efficient memory file system to the global file system namespace. The directory specified by mount_point is converted to an absolute path before use and its attributes (owner, group and mode) are inherited unless explicitly over- riden by the options described below. The following options are supported: -g group Specifies the group name or GID of the root inode of the file system. Defaults to the mount point's GID. -m mode Specifies the mode (in octal notation) of the root inode of the file system. Defaults to the mount point's mode. -n nodes Specifies the maximum number of nodes available to the file system. -o options Options are specified with a -o flag followed by a comma-sep- arated string of options. See the mount(8) man page for pos- sible options and their meanings. -s size Specifies the total file system size in bytes. If zero is given (the default), the available amount of memory (includ- ing main memory and swap space) will be used. Note that four megabytes are always reserved for the system and cannot be assigned to the file system. -u user Specifies the user name or UID of the root inode of the file system. Defaults to the mount point's UID. Every option that accepts a numerical value as its argument can take a trailing `b' to indicate bytes (the default), a trailing `k' to indicate kilobytes, a trailing `M' to indicate megabytes or a trailing `G' to indicate gigabytes. Note that both lowercase and uppercase forms of these letters are allowed.
EXAMPLES
The following command mounts a tmpfs instance over the /tmp directory, inheriting its owner, group and mode settings: mount -t tmpfs tmpfs /tmp The following command mounts a tmpfs instance over the /mnt directory, setting a 20 megabytes limit in space, owned by the `joe' user and belonging to the `users' group, with a restricted 0700 mode: mount -t tmpfs -o -s20M -o -ujoe -o -gusers -o -m0700 tmpfs /mnt See /usr/share/examples/fstab/fstab.ramdisk for some examples on how to add tmpfs entries to /etc/fstab.
SEE ALSO
fstab(5), mount(8)
HISTORY
The mount_tmpfs utility first appeared in NetBSD 4.0. NetBSD 4.0 November 11, 2006 NetBSD 4.0
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