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man mount | col -b > mount_man_page.txt |
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MOUNT(8) Linux Programmer's Manual MOUNT(8)
NAME
mount - mount a file system
SYNOPSIS
mount [-lhV]
mount -a [-fFnrsvw] [-t vfstype] [-O optlist]
mount [-fnrsvw] [-o options [,...]] device | dir
mount [-fnrsvw] [-t vfstype] [-o options] device dir
DESCRIPTION
All files accessible in a Unix system are arranged in one big tree, the
file hierarchy, rooted at /. These files can be spread out over sev-
eral devices. The mount command serves to attach the file system found
on some device to the big file tree. Conversely, the umount(8) command
will detach it again.
The standard form of the mount command, is
mount -t type device dir
This tells the kernel to attach the file system found on device (which
is of type type) at the directory dir. The previous contents (if any)
and owner and mode of dir become invisible, and as long as this file
system remains mounted, the pathname dir refers to the root of the file
system on device.
Three forms of invocation do not actually mount anything:
mount -h
prints a help message;
mount -V
prints a version string; and just
mount [-l] [-t type]
lists all mounted file systems (of type type). The option -l adds the
(ext2, ext3 and XFS) labels in this listing. See below.
Since Linux 2.4.0 it is possible to remount part of the file hierarchy
somewhere else. The call is
mount --bind olddir newdir
After this call the same contents is accessible in two places. One can
also remount a single file (on a single file).
This call attaches only (part of) a single filesystem, not possible
submounts. The entire file hierarchy including submounts is attached a
second place using
mount --rbind olddir newdir
Note that the filesystem mount options will remain the same as those on
the original mount point, and cannot be changed by passing the -o
option along with --bind/--rbind.
Since Linux 2.5.1 it is possible to atomically move a mounted tree to
another place. The call is
mount --move olddir newdir
Since Linux 2.6.15 it is possible to mark a mount and its submounts as
shared, private, slave or unbindable. A shared mount provides ability
to create mirrors of that mount such that mounts and umounts within any
of the mirrors propagate to the other mirror. A slave mount receives
propagation from its master, but any not vice-versa. A private mount
carries no propagation abilities. A unbindable mount is a private
mount which cannot cloned through a bind operation. Detailed semantics
is documented in Documentation/sharedsubtree.txt file in the kernel
source tree.
mount --make-shared mountpoint
mount --make-slave mountpoint
mount --make-private mountpoint
mount --make-unbindable mountpoint
The following commands allows one to recursively change the type of all
the mounts under a given mountpoint.
mount --make-rshared mountpoint
mount --make-rslave mountpoint
mount --make-rprivate mountpoint
"mount --make-runbindable mountpoint"
The proc file system is not associated with a special device, and when
mounting it, an arbitrary keyword, such as proc can be used instead of
a device specification. (The customary choice none is less fortunate:
the error message 'none busy' from umount can be confusing.)
Most devices are indicated by a file name (of a block special device),
like /dev/sda1, but there are other possibilities. For example, in the
case of an NFS mount, device may look like knuth.cwi.nl:/dir. It is
possible to indicate a block special device using its volume label or
UUID (see the -L and -U options below).
The file /etc/fstab (see fstab(5)), may contain lines describing what
devices are usually mounted where, using which options. This file is
used in three ways:
(i) The command
mount -a [-t type] [-O optlist]
(usually given in a bootscript) causes all file systems mentioned in
fstab (of the proper type and/or having or not having the proper
options) to be mounted as indicated, except for those whose line con-
tains the noauto keyword. Adding the -F option will make mount fork, so
that the filesystems are mounted simultaneously.
(ii) When mounting a file system mentioned in fstab, it suffices to
give only the device, or only the mount point.
(iii) Normally, only the superuser can mount file systems. However,
when fstab contains the user option on a line, anybody can mount the
corresponding system.
Thus, given a line
/dev/cdrom /cd iso9660 ro,user,noauto,unhide
any user can mount the iso9660 file system found on his CDROM using the
command
mount /dev/cdrom
or
mount /cd
For more details, see fstab(5). Only the user that mounted a filesys-
tem can unmount it again. If any user should be able to unmount, then
use users instead of user in the fstab line. The owner option is simi-
lar to the user option, with the restriction that the user must be the
owner of the special file. This may be useful e.g. for /dev/fd if a
login script makes the console user owner of this device. The group
option is similar, with the restriction that the user must be member of
the group of the special file.
The programs mount and umount maintain a list of currently mounted file
systems in the file /etc/mtab. If no arguments are given to mount,
this list is printed.
When the proc filesystem is mounted (say at /proc), the files /etc/mtab
and /proc/mounts have very similar contents. The former has somewhat
more information, such as the mount options used, but is not necessar-
ily up-to-date (cf. the -n option below). It is possible to replace
/etc/mtab by a symbolic link to /proc/mounts, and especially when you
have very large numbers of mounts things will be much faster with that
symlink, but some information is lost that way, and in particular work-
ing with the loop device will be less convenient, and using the "user"
option will fail.
OPTIONS
The full set of options used by an invocation of mount is determined by
first extracting the options for the file system from the fstab table,
then applying any options specified by the -o argument, and finally
applying a -r or -w option, when present.
Options available for the mount command:
-V Output version.
-h Print a help message.
-v Verbose mode.
-a Mount all filesystems (of the given types) mentioned in fstab.
-F (Used in conjunction with -a.) Fork off a new incarnation of
mount for each device. This will do the mounts on different
devices or different NFS servers in parallel. This has the
advantage that it is faster; also NFS timeouts go in parallel. A
disadvantage is that the mounts are done in undefined order.
Thus, you cannot use this option if you want to mount both /usr
and /usr/spool.
-f Causes everything to be done except for the actual system call;
if it's not obvious, this ''fakes'' mounting the file system.
This option is useful in conjunction with the -v flag to deter-
mine what the mount command is trying to do. It can also be used
to add entries for devices that were mounted earlier with the -n
option. The -f option checks for existing record in /etc/mtab
and fails when the record already exists (with regular non-fake
mount, this check is done by kernel).
-i Don't call the /sbin/mount.<filesystem> helper even if it
exists.
-l Add the ext2, ext3 and XFS labels in the mount output. Mount
must have permission to read the disk device (e.g. be suid root)
for this to work. One can set such a label for ext2 or ext3
using the e2label(8) utility, or for XFS using xfs_admin(8), or
for reiserfs using reiserfstune(8).
-n Mount without writing in /etc/mtab. This is necessary for exam-
ple when /etc is on a read-only file system.
-p num In case of a loop mount with encryption, read the passphrase
from file descriptor num instead of from the terminal.
-s Tolerate sloppy mount options rather than failing. This will
ignore mount options not supported by a filesystem type. Not all
filesystems support this option. This option exists for support
of the Linux autofs-based automounter.
-r Mount the file system read-only. A synonym is -o ro.
-w Mount the file system read/write. This is the default. A synonym
is -o rw.
-L label
Mount the partition that has the specified label.
-U uuid
Mount the partition that has the specified uuid. These two
options require the file /proc/partitions (present since Linux
2.1.116) to exist.
-t vfstype
The argument following the -t is used to indicate the file sys-
tem type. The file system types which are currently supported
include: adfs, affs, autofs, cifs, coda, coherent, cramfs,
debugfs, devpts, efs, ext, ext2, ext3, hfs, hfsplus, hpfs,
iso9660, jfs, minix, msdos, ncpfs, nfs, nfs4, ntfs, proc, qnx4,
ramfs, reiserfs, romfs, smbfs, sysv, tmpfs, udf, ufs, umsdos,
usbfs, vfat, xenix, xfs, xiafs. Note that coherent, sysv and
xenix are equivalent and that xenix and coherent will be removed
at some point in the future -- use sysv instead. Since kernel
version 2.1.21 the types ext and xiafs do not exist anymore.
Earlier, usbfs was known as usbdevfs. Note, the real list of
all supported filesystems depends on your kernel.
For most types all the mount program has to do is issue a simple
mount(2) system call, and no detailed knowledge of the filesys-
tem type is required. For a few types however (like nfs, nfs4,
cifs, smbfs, ncpfs) ad hoc code is necessary. The nfs, nfs4,
cifs, smbfs, and ncpfs have a separate mount program. In order
to make it possible to treat all types in a uniform way, mount
will execute the program /sbin/mount.TYPE (if that exists) when
called with type TYPE. Since various versions of the smbmount
program have different calling conventions, /sbin/mount.smbfs
may have to be a shell script that sets up the desired call.
If no -t option is given, or if the auto type is specified,
mount will try to guess the desired type. Mount uses the blkid
or volume_id library for guessing the filesystem type; if that
does not turn up anything that looks familiar, mount will try to
read the file /etc/filesystems, or, if that does not exist,
/proc/filesystems. All of the filesystem types listed there
will be tried, except for those that are labeled "nodev" (e.g.,
devpts, proc and nfs). If /etc/filesystems ends in a line with
a single * only, mount will read /proc/filesystems afterwards.
The auto type may be useful for user-mounted floppies. Creating
a file /etc/filesystems can be useful to change the probe order
(e.g., to try vfat before msdos or ext3 before ext2) or if you
use a kernel module autoloader. Warning: the probing uses a
heuristic (the presence of appropriate 'magic'), and could rec-
ognize the wrong filesystem type, possibly with catastrophic
consequences. If your data is valuable, don't ask mount to
guess.
More than one type may be specified in a comma separated list.
The list of file system types can be prefixed with no to specify
the file system types on which no action should be taken. (This
can be meaningful with the -a option.)
For example, the command:
mount -a -t nomsdos,ext
mounts all file systems except those of type msdos and ext.
-O Used in conjunction with -a, to limit the set of filesystems to
which the -a is applied. Like -t in this regard except that it
is useless except in the context of -a. For example, the com-
mand:
mount -a -O no_netdev
mounts all file systems except those which have the option _net-
dev specified in the options field in the /etc/fstab file.
It is different from -t in that each option is matched exactly;
a leading no at the beginning of one option does not negate the
rest.
The -t and -O options are cumulative in effect; that is, the
command
mount -a -t ext2 -O _netdev
mounts all ext2 filesystems with the _netdev option, not all
filesystems that are either ext2 or have the _netdev option
specified.
-o Options are specified with a -o flag followed by a comma sepa-
rated string of options. Some of these options are only useful
when they appear in the /etc/fstab file. The following options
apply to any file system that is being mounted (but not every
file system actually honors them - e.g., the sync option today
has effect only for ext2, ext3, fat, vfat and ufs):
async All I/O to the file system should be done asynchronously.
atime Update inode access time for each access. This is the
default.
auto Can be mounted with the -a option.
defaults
Use default options: rw, suid, dev, exec, auto, nouser,
and async.
dev Interpret character or block special devices on the file
system.
exec Permit execution of binaries.
group Allow an ordinary (i.e., non-root) user to mount the file
system if one of his groups matches the group of the
device. This option implies the options nosuid and nodev
(unless overridden by subsequent options, as in the
option line group,dev,suid).
mand Allow mandatory locks on this filesystem. See fcntl(2).
_netdev
The filesystem resides on a device that requires network
access (used to prevent the system from attempting to
mount these filesystems until the network has been
enabled on the system).
noatime
Do not update inode access times on this file system
(e.g, for faster access on the news spool to speed up
news servers).
nodiratime
Do not update directory inode access times on this
filesystem.
relatime
Update inode access times relative to modify or change
time. Access time is only updated if the previous access
time was earlier than the current modify or change time.
(Similar to noatime, but doesn't break mutt or other
applications that need to know if a file has been read
since the last time it was modified.)
noauto Can only be mounted explicitly (i.e., the -a option will
not cause the file system to be mounted).
nodev Do not interpret character or block special devices on
the file system.
noexec Do not allow direct execution of any binaries on the
mounted file system. (Until recently it was possible to
run binaries anyway using a command like /lib/ld*.so
/mnt/binary. This trick fails since Linux 2.4.25 /
2.6.0.)
nomand Do not allow mandatory locks on this filesystem.
nosuid Do not allow set-user-identifier or set-group-identifier
bits to take effect. (This seems safe, but is in fact
rather unsafe if you have suidperl(1) installed.)
nouser Forbid an ordinary (i.e., non-root) user to mount the
file system. This is the default.
owner Allow an ordinary (i.e., non-root) user to mount the file
system if he is the owner of the device. This option
implies the options nosuid and nodev (unless overridden
by subsequent options, as in the option line
owner,dev,suid).
remount
Attempt to remount an already-mounted file system. This
is commonly used to change the mount flags for a file
system, especially to make a readonly file system write-
able. It does not change device or mount point.
ro Mount the file system read-only.
rw Mount the file system read-write.
suid Allow set-user-identifier or set-group-identifier bits to
take effect.
sync All I/O to the file system should be done synchronously.
In case of media with limited number of write cycles
(e.g. some flash drives) "sync" may cause life-cycle
shortening.
dirsync
All directory updates within the file system should be
done synchronously. This affects the following system
calls: creat, link, unlink, symlink, mkdir, rmdir, mknod
and rename.
user Allow an ordinary user to mount the file system. The
name of the mounting user is written to mtab so that he
can unmount the file system again. This option implies
the options noexec, nosuid, and nodev (unless overridden
by subsequent options, as in the option line
user,exec,dev,suid).
users Allow every user to mount and unmount the file system.
This option implies the options noexec, nosuid, and nodev
(unless overridden by subsequent options, as in the
option line users,exec,dev,suid).
context=context, fscontext=context and defcontext=context
The context= option is useful when mounting filesystems
that do not support extended attributes, such as a floppy
or hard disk formatted with VFAT, or systems that are not
normally running under SELinux, such as an ext3 formatted
disk from a non-SELinux workstation. You can also use
context= on filesystems you do not trust, such as a
floppy. It also helps in compatibility with xattr-sup-
porting filesystems on earlier 2.4.<x> kernel versions.
Even where xattrs are supported, you can save time not
having to label every file by assigning the entire disk
one security context.
A commonly used option for removable media is con-
text=system_u:object_r:removable_t.
Two other options are fscontext= and defcontext=, both of
which are mutually exclusive of the context option. This
means you can use fscontext and defcontext with each
other, but neither can be used with context.
The fscontext= option works for all filesystems, regard-
less of their xattr support. The fscontext option sets
the overarching filesystem label to a specific security
context. This filesystem label is separate from the indi-
vidual labels on the files. It represents the entire
filesystem for certain kinds of permission checks, such
as during mount or file creation. Individual file labels
are still obtained from the xattrs on the files them-
selves. The context option actually sets the aggregate
context that fscontext provides, in addition to supplying
the same label for individual files.
You can set the default security context for unlabeled
files using defcontext= option. This overrides the value
set for unlabeled files in the policy and requires a file
system that supports xattr labeling.
For more details see selinux(8)
--bind Remount a subtree somewhere else (so that its contents are
available in both places). See above.
--move Move a subtree to some other place. See above.
FILESYSTEM SPECIFIC MOUNT OPTIONS
The following options apply only to certain file systems. We sort them
by file system. They all follow the -o flag.
What options are supported depends a bit on the running kernel. More
info may be found in the kernel source subdirectory Documenta-
tion/filesystems.
Mount options for adfs
uid=value and gid=value
Set the owner and group of the files in the file system
(default: uid=gid=0).
ownmask=value and othmask=value
Set the permission mask for ADFS 'owner' permissions and 'other'
permissions, respectively (default: 0700 and 0077, respec-
tively). See also /usr/src/linux/Documentation/filesys-
tems/adfs.txt.
Mount options for affs
uid=value and gid=value
Set the owner and group of the root of the file system (default:
uid=gid=0, but with option uid or gid without specified value,
the uid and gid of the current process are taken).
setuid=value and setgid=value
Set the owner and group of all files.
mode=value
Set the mode of all files to value & 0777 disregarding the orig-
inal permissions. Add search permission to directories that
have read permission. The value is given in octal.
protect
Do not allow any changes to the protection bits on the file sys-
tem.
usemp Set uid and gid of the root of the file system to the uid and
gid of the mount point upon the first sync or umount, and then
clear this option. Strange...
verbose
Print an informational message for each successful mount.
prefix=string
Prefix used before volume name, when following a link.
volume=string
Prefix (of length at most 30) used before '/' when following a
symbolic link.
reserved=value
(Default: 2.) Number of unused blocks at the start of the
device.
root=value
Give explicitly the location of the root block.
bs=value
Give blocksize. Allowed values are 512, 1024, 2048, 4096.
grpquota / noquota / quota / usrquota
These options are accepted but ignored. (However, quota utili-
ties may react to such strings in /etc/fstab.)
Mount options for cifs
See the options section of the mount.cifs(8) man page (cifs-mount pack-
age must be installed).
Mount options for coherent
None.
Mount options for debugfs
The debugfs file system is a pseudo file system, traditionally mounted
on /sys/kernel/debug. There are no mount options.
Mount options for devpts
The devpts file system is a pseudo file system, traditionally mounted
on /dev/pts. In order to acquire a pseudo terminal, a process opens
/dev/ptmx; the number of the pseudo terminal is then made available to
the process and the pseudo terminal slave can be accessed as
/dev/pts/<number>.
uid=value and gid=value
This sets the owner or the group of newly created PTYs to the
specified values. When nothing is specified, they will be set to
the UID and GID of the creating process. For example, if there
is a tty group with GID 5, then gid=5 will cause newly created
PTYs to belong to the tty group.
mode=value
Set the mode of newly created PTYs to the specified value. The
default is 0600. A value of mode=620 and gid=5 makes "mesg y"
the default on newly created PTYs.
Mount options for ext
None. Note that the 'ext' file system is obsolete. Don't use it.
Since Linux version 2.1.21 extfs is no longer part of the kernel
source.
Mount options for ext2
The 'ext2' file system is the standard Linux file system. Since Linux
2.5.46, for most mount options the default is determined by the
filesystem superblock. Set them with tune2fs(8).
acl / noacl
Support POSIX Access Control Lists (or not).
bsddf / minixdf
Set the behaviour for the statfs system call. The minixdf
behaviour is to return in the f_blocks field the total number of
blocks of the file system, while the bsddf behaviour (which is
the default) is to subtract the overhead blocks used by the ext2
file system and not available for file storage. Thus
% mount /k -o minixdf; df /k; umount /k
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/sda6 2630655 86954 2412169 3% /k
% mount /k -o bsddf; df /k; umount /k
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/sda6 2543714 13 2412169 0% /k
(Note that this example shows that one can add command line options to
the options given in /etc/fstab.)
check=none / nocheck
No checking is done at mount time. This is the default. This is
fast. It is wise to invoke e2fsck(8) every now and then, e.g.
at boot time.
debug Print debugging info upon each (re)mount.
errors=continue / errors=remount-ro / errors=panic
Define the behaviour when an error is encountered. (Either
ignore errors and just mark the file system erroneous and con-
tinue, or remount the file system read-only, or panic and halt
the system.) The default is set in the filesystem superblock,
and can be changed using tune2fs(8).
grpid or bsdgroups / nogrpid or sysvgroups
These options define what group id a newly created file gets.
When grpid is set, it takes the group id of the directory in
which it is created; otherwise (the default) it takes the fsgid
of the current process, unless the directory has the setgid bit
set, in which case it takes the gid from the parent directory,
and also gets the setgid bit set if it is a directory itself.
grpquota / noquota / quota / usrquota
These options are accepted but ignored.
nobh Do not attach buffer_heads to file pagecache. (Since 2.5.49.)
nouid32
Disables 32-bit UIDs and GIDs. This is for interoperability
with older kernels which only store and expect 16-bit values.
oldalloc or orlov
Use old allocator or Orlov allocator for new inodes. Orlov is
default.
resgid=n and resuid=n
The ext2 file system reserves a certain percentage of the avail-
able space (by default 5%, see mke2fs(8) and tune2fs(8)). These
options determine who can use the reserved blocks. (Roughly:
whoever has the specified uid, or belongs to the specified
group.)
sb=n Instead of block 1, use block n as superblock. This could be
useful when the filesystem has been damaged. (Earlier, copies
of the superblock would be made every 8192 blocks: in block 1,
8193, 16385, ... (and one got thousands of copies on a big
filesystem). Since version 1.08, mke2fs has a -s (sparse
superblock) option to reduce the number of backup superblocks,
and since version 1.15 this is the default. Note that this may
mean that ext2 filesystems created by a recent mke2fs cannot be
mounted r/w under Linux 2.0.*.) The block number here uses 1k
units. Thus, if you want to use logical block 32768 on a
filesystem with 4k blocks, use "sb=131072".
user_xattr / nouser_xattr
Support "user." extended attributes (or not).
Mount options for ext3
The 'ext3' file system is a version of the ext2 file system which has
been enhanced with journalling. It supports the same options as ext2
as well as the following additions:
journal=update
Update the ext3 file system's journal to the current format.
journal=inum
When a journal already exists, this option is ignored. Other-
wise, it specifies the number of the inode which will represent
the ext3 file system's journal file; ext3 will create a new
journal, overwriting the old contents of the file whose inode
number is inum.
noload Do not load the ext3 file system's journal on mounting.
data=journal / data=ordered / data=writeback
Specifies the journalling mode for file data. Metadata is
always journaled. To use modes other than ordered on the root
file system, pass the mode to the kernel as boot parameter, e.g.
rootflags=data=journal.
journal
All data is committed into the journal prior to being
written into the main file system.
ordered
This is the default mode. All data is forced directly
out to the main file system prior to its metadata being
committed to the journal.
writeback
Data ordering is not preserved - data may be written into
the main file system after its metadata has been commit-
ted to the journal. This is rumoured to be the highest-
throughput option. It guarantees internal file system
integrity, however it can allow old data to appear in
files after a crash and journal recovery.
commit=nrsec
Sync all data and metadata every nrsec seconds. The default
value is 5 seconds. Zero means default.
user_xattr
Enable Extended User Attributes. See the attr(5) manual page.
acl Enable POSIX Access Control Lists. See the acl(5) manual page.
Mount options for fat
(Note: fat is not a separate filesystem, but a common part of the
msdos, umsdos and vfat filesystems.)
blocksize=512 / blocksize=1024 / blocksize=2048
Set blocksize (default 512).
uid=value and gid=value
Set the owner and group of all files. (Default: the uid and gid
of the current process.)
umask=value
Set the umask (the bitmask of the permissions that are not
present). The default is the umask of the current process. The
value is given in octal.
dmask=value
Set the umask applied to directories only. The default is the
umask of the current process. The value is given in octal.
fmask=value
Set the umask applied to regular files only. The default is the
umask of the current process. The value is given in octal.
check=value
Three different levels of pickyness can be chosen:
r[elaxed]
Upper and lower case are accepted and equivalent, long
name parts are truncated (e.g. verylongname.foobar
becomes verylong.foo), leading and embedded spaces are
accepted in each name part (name and extension).
n[ormal]
Like "relaxed", but many special characters (*, ?, <,
spaces, etc.) are rejected. This is the default.
s[trict]
Like "normal", but names may not contain long parts and
special characters that are sometimes used on Linux, but
are not accepted by MS-DOS are rejected. (+, =, spaces,
etc.)
codepage=value
Sets the codepage for converting to shortname characters on FAT
and VFAT filesystems. By default, codepage 437 is used.
conv=b[inary] / conv=t[ext] / conv=a[uto]
The fat file system can perform CRLF<-->NL (MS-DOS text format
to UNIX text format) conversion in the kernel. The following
conversion modes are available:
binary no translation is performed. This is the default.
text CRLF<-->NL translation is performed on all files.
auto CRLF<-->NL translation is performed on all files that
don't have a "well-known binary" extension. The list of
known extensions can be found at the beginning of
fs/fat/misc.c (as of 2.0, the list is: exe, com, bin,
app, sys, drv, ovl, ovr, obj, lib, dll, pif, arc, zip,
lha, lzh, zoo, tar, z, arj, tz, taz, tzp, tpz, gz, tgz,
deb, gif, bmp, tif, gl, jpg, pcx, tfm, vf, gf, pk, pxl,
dvi).
Programs that do computed lseeks won't like in-kernel text con-
version. Several people have had their data ruined by this
translation. Beware!
For file systems mounted in binary mode, a conversion tool
(fromdos/todos) is available.
cvf_format=module
Forces the driver to use the CVF (Compressed Volume File) module
cvf_module instead of auto-detection. If the kernel supports
kmod, the cvf_format=xxx option also controls on-demand CVF mod-
ule loading.
cvf_option=option
Option passed to the CVF module.
debug Turn on the debug flag. A version string and a list of file
system parameters will be printed (these data are also printed
if the parameters appear to be inconsistent).
fat=12 / fat=16 / fat=32
Specify a 12, 16 or 32 bit fat. This overrides the automatic
FAT type detection routine. Use with caution!
iocharset=value
Character set to use for converting between 8 bit characters and
16 bit Unicode characters. The default is iso8859-1. Long file-
names are stored on disk in Unicode format.
quiet Turn on the quiet flag. Attempts to chown or chmod files do not
return errors, although they fail. Use with caution!
sys_immutable, showexec, dots, nodots, dotsOK=[yes|no]
Various misguided attempts to force Unix or DOS conventions onto
a FAT file system.
Mount options for hfs
creator=cccc, type=cccc
Set the creator/type values as shown by the MacOS finder used
for creating new files. Default values: '????'.
uid=n, gid=n
Set the owner and group of all files. (Default: the uid and gid
of the current process.)
dir_umask=n, file_umask=n, umask=n
Set the umask used for all directories, all regular files, or
all files and directories. Defaults to the umask of the current
process.
session=n
Select the CDROM session to mount. Defaults to leaving that
decision to the CDROM driver. This option will fail with any-
thing but a CDROM as underlying device.
part=n Select partition number n from the device. Only makes sense for
CDROMS. Defaults to not parsing the partition table at all.
quiet Don't complain about invalid mount options.
Mount options for hpfs
uid=value and gid=value
Set the owner and group of all files. (Default: the uid and gid
of the current process.)
umask=value
Set the umask (the bitmask of the permissions that are not
present). The default is the umask of the current process. The
value is given in octal.
case=lower / case=asis
Convert all files names to lower case, or leave them. (Default:
case=lower.)
conv=binary / conv=text / conv=auto
For conv=text, delete some random CRs (in particular, all fol-
lowed by NL) when reading a file. For conv=auto, choose more or
less at random between conv=binary and conv=text. For
conv=binary, just read what is in the file. This is the default.
nocheck
Do not abort mounting when certain consistency checks fail.
Mount options for iso9660
ISO 9660 is a standard describing a filesystem structure to be used on
CD-ROMs. (This filesystem type is also seen on some DVDs. See also the
udf filesystem.)
Normal iso9660 filenames appear in a 8.3 format (i.e., DOS-like
restrictions on filename length), and in addition all characters are in
upper case. Also there is no field for file ownership, protection,
number of links, provision for block/character devices, etc.
Rock Ridge is an extension to iso9660 that provides all of these unix
like features. Basically there are extensions to each directory record
that supply all of the additional information, and when Rock Ridge is
in use, the filesystem is indistinguishable from a normal UNIX file
system (except that it is read-only, of course).
norock Disable the use of Rock Ridge extensions, even if available. Cf.
map.
nojoliet
Disable the use of Microsoft Joliet extensions, even if avail-
able. Cf. map.
check=r[elaxed] / check=s[trict]
With check=relaxed, a filename is first converted to lower case
before doing the lookup. This is probably only meaningful
together with norock and map=normal. (Default: check=strict.)
uid=value and gid=value
Give all files in the file system the indicated user or group
id, possibly overriding the information found in the Rock Ridge
extensions. (Default: uid=0,gid=0.)
map=n[ormal] / map=o[ff] / map=a[corn]
For non-Rock Ridge volumes, normal name translation maps upper
to lower case ASCII, drops a trailing ';1', and converts ';' to
'.'. With map=off no name translation is done. See norock.
(Default: map=normal.) map=acorn is like map=normal but also
apply Acorn extensions if present.
mode=value
For non-Rock Ridge volumes, give all files the indicated mode.
(Default: read permission for everybody.) Since Linux 2.1.37
one no longer needs to specify the mode in decimal. (Octal is
indicated by a leading 0.)
unhide Also show hidden and associated files. (If the ordinary files
and the associated or hidden files have the same filenames, this
may make the ordinary files inaccessible.)
block=[512|1024|2048]
Set the block size to the indicated value. (Default:
block=1024.)
conv=a[uto] / conv=b[inary] / conv=m[text] / conv=t[ext]
(Default: conv=binary.) Since Linux 1.3.54 this option has no
effect anymore. (And non-binary settings used to be very dan-
gerous, possibly leading to silent data corruption.)
cruft If the high byte of the file length contains other garbage, set
this mount option to ignore the high order bits of the file
length. This implies that a file cannot be larger than 16MB.
session=x
Select number of session on multisession CD. (Since 2.3.4.)
sbsector=xxx
Session begins from sector xxx. (Since 2.3.4.)
The following options are the same as for vfat and specifying them only
makes sense when using discs encoded using Microsoft's Joliet exten-
sions.
iocharset=value
Character set to use for converting 16 bit Unicode characters on
CD to 8 bit characters. The default is iso8859-1.
utf8 Convert 16 bit Unicode characters on CD to UTF-8.
Mount options for jfs
iocharset=name
Character set to use for converting from Unicode to ASCII. The
default is to do no conversion. Use iocharset=utf8 for UTF8
translations. This requires CONFIG_NLS_UTF8 to be set in the
kernel .config file.
resize=value
Resize the volume to value blocks. JFS only supports growing a
volume, not shrinking it. This option is only valid during a
remount, when the volume is mounted read-write. The resize key-
word with no value will grow the volume to the full size of the
partition.
nointegrity
Do not write to the journal. The primary use of this option is
to allow for higher performance when restoring a volume from
backup media. The integrity of the volume is not guaranteed if
the system abnormally abends.
integrity
Default. Commit metadata changes to the journal. Use this
option to remount a volume where the nointegrity option was pre-
viously specified in order to restore normal behavior.
errors=continue / errors=remount-ro / errors=panic
Define the behaviour when an error is encountered. (Either
ignore errors and just mark the file system erroneous and con-
tinue, or remount the file system read-only, or panic and halt
the system.)
noquota / quota / usrquota / grpquota
These options are accepted but ignored.
Mount options for minix
None.
Mount options for msdos
See mount options for fat. If the msdos file system detects an incon-
sistency, it reports an error and sets the file system read-only. The
file system can be made writeable again by remounting it.
Mount options for ncpfs
Just like nfs, the ncpfs implementation expects a binary argument (a
struct ncp_mount_data) to the mount system call. This argument is con-
structed by ncpmount(8) and the current version of mount (2.12) does
not know anything about ncpfs.
Mount options for nfs and nfs4
See the options section of the nfs(5) man page (nfs-utils package must
be installed).
The nfs and nfs4 implementation expects a binary argument (a struct
nfs_mount_data) to the mount system call. This argument is constructed
by mount.nfs(8) and the current version of mount (2.13) does not know
anything about nfs and nfs4.
Mount options for ntfs
iocharset=name
Character set to use when returning file names. Unlike VFAT,
NTFS suppresses names that contain unconvertible characters.
Deprecated.
nls=name
New name for the option earlier called iocharset.
utf8 Use UTF-8 for converting file names.
uni_xlate=[0|1|2]
For 0 (or 'no' or 'false'), do not use escape sequences for
unknown Unicode characters. For 1 (or 'yes' or 'true') or 2,
use vfat-style 4-byte escape sequences starting with ":". Here 2
give a little-endian encoding and 1 a byteswapped bigendian
encoding.
posix=[0|1]
If enabled (posix=1), the file system distinguishes between
upper and lower case. The 8.3 alias names are presented as hard
links instead of being suppressed.
uid=value, gid=value and umask=value
Set the file permission on the filesystem. The umask value is
given in octal. By default, the files are owned by root and not
readable by somebody else.
Mount options for proc
uid=value and gid=value
These options are recognized, but have no effect as far as I can
see.
Mount options for ramfs
Ramfs is a memory based filesystem. Mount it and you have it. Unmount
it and it is gone. Present since Linux 2.3.99pre4. There are no mount
options.
Mount options for reiserfs
Reiserfs is a journaling filesystem. The reiserfs mount options are
more fully described at http://www.namesys.com/mount-options.html.
conv Instructs version 3.6 reiserfs software to mount a version 3.5
file system, using the 3.6 format for newly created objects.
This file system will no longer be compatible with reiserfs 3.5
tools.
hash=rupasov / hash=tea / hash=r5 / hash=detect
Choose which hash function reiserfs will use to find files
within directories.
rupasov
A hash invented by Yury Yu. Rupasov. It is fast and pre-
serves locality, mapping lexicographically close file
names to close hash values. This option should not be
used, as it causes a high probability of hash collisions.
tea A Davis-Meyer function implemented by Jeremy
Fitzhardinge. It uses hash permuting bits in the name.
It gets high randomness and, therefore, low probability
of hash collisions at some CPU cost. This may be used if
EHASHCOLLISION errors are experienced with the r5 hash.
r5 A modified version of the rupasov hash. It is used by
default and is the best choice unless the file system has
huge directories and unusual file-name patterns.
detect Instructs mount to detect which hash function is in use
by examining the file system being mounted, and to write
this information into the reiserfs superblock. This is
only useful on the first mount of an old format file sys-
tem.
hashed_relocation
Tunes the block allocator. This may provide performance improve-
ments in some situations.
no_unhashed_relocation
Tunes the block allocator. This may provide performance improve-
ments in some situations.
noborder
Disable the border allocator algorithm invented by Yury Yu.
Rupasov. This may provide performance improvements in some sit-
uations.
nolog Disable journalling. This will provide slight performance
improvements in some situations at the cost of losing reiserfs's
fast recovery from crashes. Even with this option turned on,
reiserfs still performs all journalling operations, save for
actual writes into its journalling area. Implementation of
nolog is a work in progress.
notail By default, reiserfs stores small files and 'file tails'
directly into its tree. This confuses some utilities such as
LILO(8). This option is used to disable packing of files into
the tree.
replayonly
Replay the transactions which are in the journal, but do not
actually mount the file system. Mainly used by reiserfsck.
resize=number
A remount option which permits online expansion of reiserfs par-
titions. Instructs reiserfs to assume that the device has num-
ber blocks. This option is designed for use with devices which
are under logical volume management (LVM). There is a special
resizer utility which can be obtained from
ftp://ftp.namesys.com/pub/reiserfsprogs.
user_xattr
Enable Extended User Attributes. See the attr(5) manual page.
acl Enable POSIX Access Control Lists. See the acl(5) manual page.
Mount options for romfs
None.
Mount options for smbfs
Just like nfs, the smbfs implementation expects a binary argument (a
struct smb_mount_data) to the mount system call. This argument is con-
structed by smbmount(8) and the current version of mount (2.12) does
not know anything about smbfs.
Mount options for sysv
None.
Mount options for tmpfs
The following parameters accept a suffix k, m or g for Ki, Mi, Gi
(binary kilo, mega and giga) and can be changed on remount.
size=nbytes
Override default maximum size of the filesystem. The size is
given in bytes, and rounded down to entire pages. The default
is half of the memory.
nr_blocks=
Set number of blocks.
nr_inodes=
Set number of inodes.
mode= Set initial permissions of the root directory.
Mount options for udf
udf is the "Universal Disk Format" filesystem defined by the Optical
Storage Technology Association, and is often used for DVD-ROM. See
also iso9660.
gid= Set the default group.
umask= Set the default umask. The value is given in octal.
uid= Set the default user.
unhide Show otherwise hidden files.
undelete
Show deleted files in lists.
nostrict
Unset strict conformance.
iocharset
Set the NLS character set.
bs= Set the block size. (May not work unless 2048.)
novrs Skip volume sequence recognition.
session=
Set the CDROM session counting from 0. Default: last session.
anchor=
Override standard anchor location. Default: 256.
volume=
Override the VolumeDesc location. (unused)
partition=
Override the PartitionDesc location. (unused)
lastblock=
Set the last block of the filesystem.
fileset=
Override the fileset block location. (unused)
rootdir=
Override the root directory location. (unused)
Mount options for ufs
ufstype=value
UFS is a file system widely used in different operating systems.
The problem are differences among implementations. Features of
some implementations are undocumented, so its hard to recognize
the type of ufs automatically. That's why the user must specify
the type of ufs by mount option. Possible values are:
old Old format of ufs, this is the default, read only.
(Don't forget to give the -r option.)
44bsd For filesystems created by a BSD-like system
(NetBSD,FreeBSD,OpenBSD).
sun For filesystems created by SunOS or Solaris on Sparc.
sunx86 For filesystems created by Solaris on x86.
hp For filesystems created by HP-UX, read-only.
nextstep
For filesystems created by NeXTStep (on NeXT station)
(currently read only).
nextstep-cd
For NextStep CDROMs (block_size == 2048), read-only.
openstep
For filesystems created by OpenStep (currently read
only). The same filesystem type is also used by Mac OS
X.
onerror=value
Set behaviour on error:
panic If an error is encountered, cause a kernel panic.
[lock|umount|repair]
These mount options don't do anything at present; when an
error is encountered only a console message is printed.
Mount options for umsdos
See mount options for msdos. The dotsOK option is explicitly killed by
umsdos.
Mount options for vfat
First of all, the mount options for fat are recognized. The dotsOK
option is explicitly killed by vfat. Furthermore, there are
uni_xlate
Translate unhandled Unicode characters to special escaped
sequences. This lets you backup and restore filenames that are
created with any Unicode characters. Without this option, a '?'
is used when no translation is possible. The escape character is
':' because it is otherwise illegal on the vfat filesystem. The
escape sequence that gets used, where u is the unicode charac-
ter, is: ':', (u & 0x3f), ((u>>6) & 0x3f), (u>>12).
posix Allow two files with names that only differ in case.
nonumtail
First try to make a short name without sequence number, before
trying name~num.ext.
utf8 UTF8 is the filesystem safe 8-bit encoding of Unicode that is
used by the console. It can be be enabled for the filesystem
with this option. If 'uni_xlate' gets set, UTF8 gets disabled.
shortname=[lower|win95|winnt|mixed]
Defines the behaviour for creation and display of filenames
which fit into 8.3 characters. If a long name for a file exists,
it will always be preferred display. There are four modes:
lower Force the short name to lower case upon display; store a
long name when the short name is not all upper case.
win95 Force the short name to upper case upon display; store a
long name when the short name is not all upper case.
winnt Display the shortname as is; store a long name when the
short name is not all lower case or all upper case.
mixed Display the short name as is; store a long name when the
short name is not all upper case.
The default is "lower".
Mount options for usbfs
devuid=uid and devgid=gid and devmode=mode
Set the owner and group and mode of the device files in the
usbfs file system (default: uid=gid=0, mode=0644). The mode is
given in octal.
busuid=uid and busgid=gid and busmode=mode
Set the owner and group and mode of the bus directories in the
usbfs file system (default: uid=gid=0, mode=0555). The mode is
given in octal.
listuid=uid and listgid=gid and listmode=mode
Set the owner and group and mode of the file devices (default:
uid=gid=0, mode=0444). The mode is given in octal.
Mount options for xenix
None.
Mount options for xfs
allocsize=size
Sets the buffered I/O end-of-file preallocation size when doing
delayed allocation writeout (default size is 64KiB). Valid val-
ues for this option are page size (typically 4KiB) through to
1GiB, inclusive, in power-of-2 increments.
attr2 / noattr2
The options enable/disable (default is disabled for backward
compatibility on-disk) an "opportunistic" improvement to be made
in the way inline extended attributes are stored on-disk. When
the new form is used for the first time (by setting or removing
extended attributes) the on-disk superblock feature bit field
will be updated to reflect this format being in use.
barrier
Enables the use of block layer write barriers for writes into
the journal and unwritten extent conversion. This allows for
drive level write caching to be enabled, for devices that sup-
port write barriers.
dmapi Enable the DMAPI (Data Management API) event callouts. Use with
the mtpt option.
grpid / bsdgroups and nogrpid / sysvgroups
These options define what group ID a newly created file gets.
When grpid is set, it takes the group ID of the directory in
which it is created; otherwise (the default) it takes the fsgid
of the current process, unless the directory has the setgid bit
set, in which case it takes the gid from the parent directory,
and also gets the setgid bit set if it is a directory itself.
ihashsize=value
Sets the number of hash buckets available for hashing the in-
memory inodes of the specified mount point. If a value of zero
is used, the value selected by the default algorithm will be
displayed in /proc/mounts.
ikeep / noikeep
When inode clusters are emptied of inodes, keep them around on
the disk (ikeep) - this is the traditional XFS behaviour and is
still the default for now. Using the noikeep option, inode
clusters are returned to the free space pool.
inode64
Indicates that XFS is allowed to create inodes at any location
in the filesystem, including those which will result in inode
numbers occupying more than 32 bits of significance. This is
provided for backwards compatibility, but causes problems for
backup applications that cannot handle large inode numbers.
largeio / nolargeio
If nolargeio is specified, the optimal I/O reported in st_blk-
size by stat(2) will be as small as possible to allow user
applications to avoid inefficient read/modify/write I/O. If
largeio is specified, a filesystem that has a swidth specified
will return the swidth value (in bytes) in st_blksize. If the
filesystem does not have a swidth specified but does specify an
allocsize then allocsize (in bytes) will be returned instead.
If neither of these two options are specified, then filesystem
will behave as if nolargeio was specified.
logbufs=value
Set the number of in-memory log buffers. Valid numbers range
from 2-8 inclusive. The default value is 8 buffers for filesys-
tems with a blocksize of 64KiB, 4 buffers for filesystems with a
blocksize of 32KiB, 3 buffers for filesystems with a blocksize
of 16KiB and 2 buffers for all other configurations. Increasing
the number of buffers may increase performance on some workloads
at the cost of the memory used for the additional log buffers
and their associated control structures.
logbsize=value
Set the size of each in-memory log buffer. Size may be speci-
fied in bytes, or in kilobytes with a "k" suffix. Valid sizes
for version 1 and version 2 logs are 16384 (16k) and 32768
(32k). Valid sizes for version 2 logs also include 65536 (64k),
131072 (128k) and 262144 (256k). The default value for machines
with more than 32MiB of memory is 32768, machines with less mem-
ory use 16384 by default.
logdev=device and rtdev=device
Use an external log (metadata journal) and/or real-time device.
An XFS filesystem has up to three parts: a data section, a log
section, and a real-time section. The real-time section is
optional, and the log section can be separate from the data sec-
tion or contained within it. Refer to xfs(5).
mtpt=mountpoint
Use with the dmapi option. The value specified here will be
included in the DMAPI mount event, and should be the path of the
actual mountpoint that is used.
noalign
Data allocations will not be aligned at stripe unit boundaries.
noatime
Access timestamps are not updated when a file is read.
norecovery
The filesystem will be mounted without running log recovery. If
the filesystem was not cleanly unmounted, it is likely to be
inconsistent when mounted in norecovery mode. Some files or
directories may not be accessible because of this. Filesystems
mounted norecovery must be mounted read-only or the mount will
fail.
nouuid Don't check for double mounted file systems using the file sys-
tem uuid. This is useful to mount LVM snapshot volumes.
osyncisdsync
Make O_SYNC writes implement true O_SYNC. WITHOUT this option,
Linux XFS behaves as if an osyncisdsync option is used, which
will make writes to files opened with the O_SYNC flag set behave
as if the O_DSYNC flag had been used instead. This can result
in better performance without compromising data safety. However
if this option is not in effect, timestamp updates from O_SYNC
writes can be lost if the system crashes. If timestamp updates
are critical, use the osyncisosync option.
uquota / usrquota / uqnoenforce / quota
User disk quota accounting enabled, and limits (optionally)
enforced. Refer to xfs_quota(8) for further details.
gquota / grpquota / gqnoenforce
Group disk quota accounting enabled and limits (optionally)
enforced. Refer to xfs_quota(8) for further details.
pquota / prjquota / pqnoenforce
Project disk quota accounting enabled and limits (optionally)
enforced. Refer to xfs_quota(8) for further details.
sunit=value and swidth=value
Used to specify the stripe unit and width for a RAID device or a
stripe volume. value must be specified in 512-byte block units.
If this option is not specified and the filesystem was made on a
stripe volume or the stripe width or unit were specified for the
RAID device at mkfs time, then the mount system call will
restore the value from the superblock. For filesystems that are
made directly on RAID devices, these options can be used to
override the information in the superblock if the underlying
disk layout changes after the filesystem has been created. The
swidth option is required if the sunit option has been speci-
fied, and must be a multiple of the sunit value.
swalloc
Data allocations will be rounded up to stripe width boundaries
when the current end of file is being extended and the file size
is larger than the stripe width size.
Mount options for xiafs
None. Although nothing is wrong with xiafs, it is not used much, and is
not maintained. Probably one shouldn't use it. Since Linux version
2.1.21 xiafs is no longer part of the kernel source.
THE LOOP DEVICE
One further possible type is a mount via the loop device. For example,
the command
mount /tmp/fdimage /mnt -t msdos -o loop=/dev/loop3,blocksize=1024
will set up the loop device /dev/loop3 to correspond to the file
/tmp/fdimage, and then mount this device on /mnt.
This type of mount knows about three options, namely loop, offset and
encryption, that are really options to losetup(8). (These options can
be used in addition to those specific to the filesystem type.)
If no explicit loop device is mentioned (but just an option '-o loop'
is given), then mount will try to find some unused loop device and use
that. If you are not so unwise as to make /etc/mtab a symbolic link to
/proc/mounts then any loop device allocated by mount will be freed by
umount. You can also free a loop device by hand, using 'losetup -d',
see losetup(8).
RETURN CODES
mount has the following return codes (the bits can be ORed):
0 success
1 incorrect invocation or permissions
2 system error (out of memory, cannot fork, no more loop devices)
4 internal mount bug
8 user interrupt
16 problems writing or locking /etc/mtab
32 mount failure
64 some mount succeeded
NOTES
The syntax of external mount helpers is:
/sbin/mount.<suffix> spec dir [-sfnv] [-o options]
where the <suffix> is filesystem type and -sfnvo options have same
meaning like standard mount options.
FILES
/etc/fstab file system table
/etc/mtab table of mounted file systems
/etc/mtab~ lock file
/etc/mtab.tmp temporary file
/etc/filesystems a list of filesystem types to try
SEE ALSO
mount(2), umount(2), fstab(5), umount(8), swapon(8), nfs(5), xfs(5),
e2label(8), xfs_admin(8), mountd(8), nfsd(8), mke2fs(8), tune2fs(8),
losetup(8)
BUGS
It is possible for a corrupted file system to cause a crash.
Some Linux file systems don't support -o sync and -o dirsync (the ext2,
ext3, fat and vfat file systems do support synchronous updates (a la
BSD) when mounted with the sync option).
The -o remount may not be able to change mount parameters (all ext2fs-
specific parameters, except sb, are changeable with a remount, for
example, but you can't change gid or umask for the fatfs).
Mount by label or uuid will work only if your devices have the names
listed in /proc/partitions. In particular, it may well fail if the
kernel was compiled with devfs but devfs is not mounted.
It is possible that files /etc/mtab and /proc/mounts don't match. The
first file is based only on the mount command options, but the content
of the second file also depends on the kernel and others settings (e.g.
remote NFS server. In particular case the mount command may reports
unreliable information about a NFS mount point and the /proc/mounts
file usually contains more reliable information.)
Checking files on NFS filesystem referenced by file descriptors (i.e.
the fcntl and ioctl families of functions) may lead to inconsistent
result due to the lack of consistency check in kernel even if noac is
used.
HISTORY
A mount command existed in Version 5 AT&T UNIX.
AVAILABILITY
The mount command is part of the util-linux-ng package and is available
from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
Linux 2.6 2004-12-16 MOUNT(8)
MOUNT(8) 리눅스 프로그래머 매뉴얼 MOUNT(8)
이름
mount - 화일 시스템 마운트
개요
mount [-hV]
mount -a [-fnrvw] [-t 화일시스템유형]
mount [-fnrvw] [-o 옵션 [,...]] 장치 | 디렉토리
mount [-fnrvw] [-t 화일시스템유형] [-o 옵션] 장치 디렉토리
설명
유닉스 시스템의 모든 화일들은 하나의 거대한 나무 구조로 이루어져 있고그
뿌리는 / 이다. 이 화일들은 여러 장치에 나뉘어 저장될 수 있 다. mount
명 령은 각 장치에 구성된 화일 시스템을 전체 화일 나무구조에 붙이는 명령
이다. 이와 반대로 umount(8) 명령은 나무구조로부터 떼어놓는 명령이다.
mount 명령의 기본적인 사용법은
mount -t type device dir
이렇게 하면 커널로 하여금 화일 시스템 유형 type 을 갖는 장치 device 를
dir 로 지정한 디렉토리에 부착한다. 이전에 어떤 내용이 있었다 하더라도
dir 의 소유자, 모드는 가려지며 화일 시스템이 마운트되어 있는 상태 에 서
dir 이라는 경로명은 device 장치 상의 루트를 가리키게 된다.
다음 3 가지 방식으로 실행하면 어떠한 것도 마운트하지는 않는다:
mount -h
도움말을 보여준다;
mount -V
버전을 보여준다; 그리고 다음과 같이
mount [-t type]
라 고 하면 마운트된 모든 시스템을 보여준다.( type 을 지정하면 해당 유형
만 보여준다 ) - 다음을 참고하기 바란다.
proc 화일시스템은 어떠한 장치와도 연관되어 있지 않으며, 마운트할 때는예
를 들어 proc 과 같은 단어 등 아무 단어로든 장치명으로 사용하면 된다. (
하지만 none 이라고 주는 것은 안된다: umount 로부터 ‘none busy’라는 에러
메세지를 받게 되는데전혀 의미없는 내용이다. )
대 부분의 장치는 화일명으로 지칭하는데( 특별한 블럭 장치명 ) /dev/sda1,
과 같은 이름이 사용된다. 예를 들어 NFS 마운트의 경우에는 device 명 을
knuth.cwi.nl:/dir 와 같은 식으로 써주게 된다.
/etc/fstab ( fstab(5) 을 참고), 화일에서는 어떤 장치를 어디에 그리고 어
떤 옵션으로 마운트할 것인지적어두고 있다. 이 화일은 다음 3 가지 방법 으
로 사용가능하다:
(i) 다음과 같이 실행할 때
mount -a [-t type]
( 보통 부팅 과정에서 실행) 라고 하면 fstab 에서 기술되어 있는 모든 화일
시스템을 마운트시킨다. 하지만 noauto 라는 키워드를 사용한 줄은 제외 한
다.
(ii) fstab 에 기술된 화일 시스템을 마운트할 때는 그냥 장치명만 써주거나
또는마운트 포인트(마운트될 디렉토리)만 적어주면 된다.
(iii) 일반적으로는 오로지 수퍼유저만 화일시스템 마운트를 할 수 있 다.
하 지만 fstab 에 user 라는 옵션이 붙어있는 경우 어느 누구든 마운트 가능
하다.
따라서 다음과 같이
/dev/cdrom /cd iso9660 ro,user,noauto,unhide
라고 적혀 있다면 어떤 사용자든
mount /dev/cdrom
라고 입력하거나
mount /cd
함으로써 각자의 시디롬에 있는 iso9660 화일시스템을 마운트할 수 있 다.
더욱 자세한 사항은 fstab(5) 을 보기 바란다.
mount 와 umount 는 /etc/mtab 라는 화일에 현재 마운트되어 있는 화일 시스
템의 목록을 기록해둔다.
만약 mount 명령을 내릴 때 어떤 옵션도 주지 않으면이 목록이 표시될 것 이
다. proc 화일시스템이 마운트될 때( /proc이라는디렉토리에), /etc/mtab
과 /proc/mounts 는 비슷한 내용을 가지게 된다. 전자는 마운트 옵션 등 더
욱 자세한 정보를지니고 있지만 항상 최신 정보를 지니고 있는 것은 아니다.
(cf. -n 옵션을 참고 바람).
OPTIONS
mount 를 사용하면 우선 fstab 화일에 기술되어 있는 옵션을 적용한 후 -o
옵션에서 주어진 것을 적용하고 마지막으로 -r 또는 -w 이 있다면 그것을 적
용한다.
mount 명령에서 사용할 수 있는 옵션은 다음과 같다:
-v 자세한 출력 모드.
-f 실제 시스템 호출은 하지 않고 마운트할 수 있는지 점검한다. 보 통
-v 플래그를 써서 mount 명령의 결과를 알고자 할 때 유용하다.
-n /etc/mtab 화일에 쓰기 작업을 하지 않고 마운트한다. /etc 가 읽기
전용 화일 시스템인 경우에 필요하다.
-r 읽기만 가능하게 마운트한다. 같은 옵션으로는 -o ro 이 있다.
-w 읽기/쓰기 모드로 마운트한다. 기본 설정값이다. 같은 옵션으로는 -o
rw 이 있다.
-t vfstype
-t 다음에 쓰이는 인수는 화일 시스템의 유형을 지시한다. 현재 지
원되고 있는 화일 시스템 유형은 linux/fs/filesystems.c 에 적혀 있
다: minix, ext, ext2, xiafs, hpfs, fat, msdos, umsdos, vfat,
proc, nfs, iso9660, smb, ncp, affs, ufs, sysv, xenix, coherent.
마 지막 3 개는 같은 것이며 xenix 와 coherent 는 조만간 사라질 것
이다. -- sysv 을 사용하라.
iso9660 은 기본 설정치이다. 만약 -t 옵션 다음에 다른 것이 주어지
거 나 또는 auto 라고 명시되면 화일 시스템의 수퍼블럭을 조사하게
된다. (minix, ext, ext2, xia, iso9660 이 지원되고 있음). 만 약
조 사가 실패하고 /proc/filesystems 이 존재한다면, "nodev"라고 적
힌 것을 제외한 모든 화일 시스템을 조사하게 된다. (예를 들 어,
proc 와 nfs).
auto 유형은 사용자 마운트 플로피 등에 유용하다. 주의: 자동조사
는 몇 가지 특수한 표시를 사용하는데 잘못 인식하는 경우가발 생 할
수 있다.
콤 마로 분리하여 하나 이상의 유형을 명시할 수 있다. 화일 시스템
유형 앞에 no 을 붙이면 아무런 작용도 하지 못하게 만드는 것이 다.
(This can be meaningful with the ( 보통 -a 이라는 옵션을 사용할
때 쓸모있다. )
예를 들어, 다음과 같이 한다고 치자:
mount -a -t nomsdos,ext
이 명령은 msdos 와 ext 을 제외한 모든 화일 시스템을 마운트한 다.
-o -o 플 래그 뒤에 콤마로 분리한 옵션을 적어준다. 이들 중 몇몇은
/etc/fstab 화일에서만 사용할 수 있다. 다음 옵션들은 마운트될 어
떤 화일 시스템에서든 사용할 수 있는 것이다:
async 화일 시스템에 대한 I/O가 비동기적으로 이뤄지도록 한다.
auto -a 옵션으로 마운트 가능하게 한다.
defaults
다 음 과 같은 기본 옵션을 사용하게 한다: rw, suid, dev,
exec, auto, nouser, and async.
dev 화일 시스템 상의 문자, 블럭 특수 장치를 해석한다.
exec 바이너리의 실행은 허가한다.
noauto 명시적으로만 마운트 가능하다.( 즉, -a 옵션으로는 마운트되
지 않는다. )
nodev 화일 시스템 상의 문자, 블럭 장치에 대한 해석을 하지 않는
다.
noexec 마운트된 화일 시스템 상의 어떤 바이너리도 실행을 허가하지
않는다. 자신이 지원하지 않는 바이너리를 포함하는 화일 시
스템에 대해 유용하다.
nosuid set-UID, set-GID 를 무시하게 한다.
nouser 일반 사용자( 즉, 루트 아닌 )가 마운트할 수 있도록 허용 하
지 않는다. 기본 설정치이다.
remount
이미 마운트된 화일 시스템을 다시 마운트한다. 보통 읽기 전
용 화일 시스템을읽기/쓰기 모드로 전환하는 등 화일 시스 템
에 대한 플래그를 바꿀 때 사용된다.
ro 화일 시스템을 읽기만 가능하게 한다.
rw 읽기/쓰기 모두 가능하게 마운트한다.
suid set-UID, set-GID 가 효력을 발휘할 수 있게 해준다.
sync 화일 시스템에 대한 I/O가 동기적으로 이뤄지게 한다.
user Allow an ordinary user to mount the file system. This
option implies 일반 사용자도 마운트할 수 있게 허용 한 다.
이 옵션은 다음 noexec, nosuid, 와 nodev 도 효력을 발휘하
게 한다. ( 같은 줄에서 user,exec,dev,suid 등의 옵션을 주
지 않는다면 ).
화일 시스템 개별적인 마운트 옵션
다음 옵션은 몇몇 화일 시스템에만 적용된다. 화일 시스템별로 정리를 한다.
모두 -o 플래그 뒤에 쓰이는 옵션이다.
affs 화일 시스템에 대한 옵션
uid=value and gid=value
화일 시스템의 루트에 대한 소유자와 그룹을 설정한다.( 기본값은 :
uid=gid=0, 이다. 하지만 uid 와 gid 을 아무 설정값없이 적으면 현
재 프로세스의 uid, gid를 따른다.)
setuid=value and setgid=value
모든 화일의 소유자와 그룹을 설정한다.
mode=value
원래의 퍼미션을 무시하고 모든 화일에 대한 모드를 value & 0777 한
값으로 설정한다. 그리고 읽기 퍼미션을 갖는 디렉토리에 대하여 검
색 퍼미션을 부여한다. 값은 8 진수로 적는다.
protect
화일 시스템의 보호 비트에 어떤 변화도 허용치 않는다.
usemp 첫번째 sync, umount 하자마자 마운트 포인트의 uid, gid 로 화일 시
스 템 의 uid, gid 를 설정한다. 그리고 나서 다시 이 값을 지운다.
약간은 이상한 옵션이다...
verbose
각 마운트 행위에 대한 정보를 출력한다.
prefix=string
심볼릭 링크를 따라갈 때 볼륨명 앞에 prefix 를 사용한다.
volume=string
심볼릭 링크를 따라갈 때 ’/’ 앞에다 최대 30 자의 prefix 를 사용한
다.
reserved=value
(기본값: 2.) 장치의 시작부터 수치만큼의 블럭이 사용되지 않음.
root=value
루트 블럭의 위치를 명시한다.
bs=value
블 럭사이즈를 지정한다. 512, 1024, 2048, 4096 이라는 수치를 넣을
수 있다.
grpquota / noquota / quota / usrquota
이 옵션을 사용할 수는 있으나 무시된다.
coherent 화일 시스템에 대한 옵션
없음.
ext 화일 시스템에 대한 옵션
없음. ‘ext’ 화일 시스템은 이제 쓰이지 않는다. 쓰지 말라.
ext2 화일 시스템에 대한 옵션
‘ext2’ 화일 시스템은 표준 리눅스 화일 시스템이다. 커널 버그로 인해, 아
무런 마운트 옵션으로든 마운트될 수 있다. (Linux 2.0).
bsddf / minixdf
statfs 시 스 템 호출의 행동 방식을 결정한다. minixdf 의 경우
f_blocks 필드에 화일 시스템의 전체 블럭 수를 반환 하 게 한 다.
bsddf 의 경우에는 ( 기본 설정치 ) ext2 화일 시스템 자체의 의해
사용되고 화일저장에는 사용되지 않는 블럭 수를 뺀 값을 반환한 다.
예를 들자면,
% mount /k -o minixdf; df /k; umount /k
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/sda6 2630655 86954 2412169 3% /k
% mount /k -o bsddf; df /k; umount /k
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/sda6 2543714 13 2412169 0% /k
( 위 옵션은 /etc/fstab 화일에서 줄 수도 있다.)
check / check=normal / check=strict
점 검 수준을 결정한다. 옵션 중 하나가 사용되면( check=normal 이
기본 설정치 ) 마운트할 때 아이노드, 블럭을 조사하게 된 다. is
set by default) the inodes and blocks bitmaps are checked upon
mount (커다란 디스크인 경우 30 초 정도 걸리기도 한 다.) 엄 격
한(strict) 점검인 경우 자료 영역에서 해제해야 하는 블록을 점검해
준다.
check=none / nocheck
아무런 점검도 하지 않는다.
debug 마운트, 리마운트마다 정보를 출력한다.
errors=continue / errors=remount-ro / errors=panic
오류가 발생했을 때의 반응양식을 정의한다. (오류를 무시하고 화일
시 스템에 이상이 있더라도 그냥 사용하게 하거나화일 시스템을 읽기
전용으로 마운트 또는 시스템을 패닉 상태로 두어중지하도록 할 수
있 다.) 기 본 설 정 치 는 화일 시스템의 수퍼블럭에 저장되며
tune2fs(8) 를 사용하여 변경할 수 있다.
grpid 또는 bsdgroups / nogrpid 또는 sysvgroups
새롭게 생성되는 화일에 부여될 기본 그룹 ID 를 정의한 다. grpid
가 설정되어 있다면, 속한 디렉토리의 그룹 ID 를 취한다; 그렇지 않
은 경우( 기본 설정치 ), 디렉토리에 setgid 가 설정되어 있지 않 는
한 현재 프로세스의 fsgid 를 따른다. 상위 디렉토리에 setgid 가 설
정되어있는 경우 화일은 상위 디렉토리의 gid 를 따르고 디렉토리 가
생성되면 또다시 setgid 설정을 갖는다.
resgid=n 와 resuid=n
ext2 화일 시스템은 화일 시스템의 일정 퍼센트를 다른 용도로 사용
한다. ( 기본적으로 5% 인데 mke2fs(8) 와 tune2fs(8) 을 참고하 기
바 란 다). 이 옵션은 예약된 블럭을 누가 사용할 수 있는지 결정한
다. (대략 UID, GID 를 갖는 누구든 사용할 수 있다고 할 수 있다.)
sb=n 블럭 1 을 사용하지 않고 불럭 n 을 수퍼블럭으로 사용한다. 만약 화
일 시스템이 손상을 입었을 경우 유용하다. 보통 수버 블럭의 복 사
본 은 매 8192 블럭마다 있다: 따라서 1 번 블럭, 8193 블럭, 16385
블럭 등이다. (따라서 커다란 화일 시스템인 경우 수백 심지어 수천
개의 수퍼블럭 복사본을갖는다. 본인은mke2fs 를 통해 복사본 숫자를
줄이는 방법에 대하여 모른다. )
grpquota / noquota / quota / usrquota
옵션을 쓸 수는 있으나 그냥 무시된다.
fat 화일 시스템에 대한 옵션
blocksize=512 / blocksize=1024
블럭 사이즈를 결정한다.( 기본 설정치 512 ).
uid=value 와 gid=value
모든 화일의 솟유자와 그룹을 설정한다.( 기본값: 현재 프로세 스 의
UID, GID가된다.)
umask=value
umask 값을 설정한다.(기본적으로 설정되지 않을퍼미션값을 말한다.)
기본 umask 값은 현재 프로세스의 값을 따른다. 이 값은 8 진 수 로
주어야 한다.
check=value
화일 이름에 대한 3 가지 옵션이 있다.
r[elaxed]
대 소 문 자 를 쓸 수 있으며, 긴 이름은 잘려나간다.( 예.
verylongname.foobar 이라는 이름은 verylong.foo 이 된다.),
화일명 앞, 중간의 공백문자도 받아들인다.( 화일명과 확장자
)
n[ormal]
"relaxed"와 마찬가지이지만 특수문자들( *, ?, <, 스페이 스
등 )은 사용할 수없다. 이것이 기본값이다.
s[trict]
"normal" 과 같으나 이름을 길게 쓸 수 없으며 리눅스에서 많
이 사용되는 있으며 MS-DOS에서는 사용할 수 없는 특수 문 자
는 사용할 수 없다. (+, =, 공백 등 )
conv=b[inary] / conv=t[ext] / conv=a[uto]
fat 화일 시스템은 커널 수준에서 CRLF<--->NL 변환을 한다. ( MS-
DOS 텍스트를 유닉스 텍스트 형식으로 변환) 다음 변환이 가능하다:
binary 아무런 변환도 일어나지 않는다. 기본값.
text 모든 화일에 대하여 CRLF<-->NL 변환을 수행한다.
auto 이미 잘 알려진 확장자를 제 외 한 화 일 에 대 해 서 는
CRLF<--->NL 변 환 을 한 다. 잘 알려진 확장자 목록은
fs/fat/misc.c 의 첫부분에 나열되어 있다. (버전 2.0 목 록
은 다음과 같다: exe, com, bin, app, sys, drv, ovl, ovr,
obj, lib, dll, pif, arc, zip, lha, lzh, zoo, tar, z, arj,
tz, taz, tzp, tpz, gz, tgz, deb, gif, bmp, tif, gl, jpg,
pcx, tfm, vf, gf, pk, pxl, dvi).
프로그램 내부적으로 lseek 를 사용한다면 커널 내부의 텍스트 변 환
은 좋지 않다. 그러니 주의하기 바란다.
바 이 너 리 모 드 로 마운트된 화일 시스템에 대해서는 변환 도
구(fromdos/todos)를사용하면 된다.
debug debug 플래그를 작동시킨다. 화일 시스템의 버전과 파라미터 목록 을
보여준다. (파라미터값이 제대로 맞지 않을 때도 출력된다.)
fat=12 / fat=16
12 비트 fat 인지 16 비트 fat 인지 명시한다. 자동 FAT 형 감지를
하지 못하게한다. 주의하여 사용하기 바란다.
quiet quiet 플래그를 설정한다. chown, chmod 명령이 실패한다 할 지라 도
에러를 출력하지않는다. 주의하여 사요하기 바란다.
sys_immutable, showexec, dots, nodots, dotsOK=[yes|no]
FAT 화일시스템에 유닉스 또는 DOS 규칙을 무리하게 적용하려할 때
사용한다.
hpfs 화일 시스템에 대한 옵션
uid=value 와 gid=value
모든 화일의 소유자와 그룹을 설정한다.( 기본값: 현재 프로세 스 의
UID, GID를따른다.)
umask=value
umask 값을 설정한다.(기본적으로 설정되지 않을퍼미션값을 말한다.)
기본 umask 값은 현재 프로세스의 값을 따른다. 이 값은 8 진 수 로
주어야 한다.
case=lower / case=asis
화 일 명 은 모두 소문자로 바꾸거나 아니면 그래도 둔다. (기본값:
case=lower.)
conv=binary / conv=text / conv=auto
conv=text 인 경우 화일을 읽으면 CR 을 지워준다.( 특히 NL 다음 의
CR 을 지운다 ) conv=auto 인 경우 conv=binary 와 conv=text 중간쯤
의 변환을 해준다. conv=binary 인 경우 화일을 있는 그대로 읽 는
다. 기본값.
nocheck
화 일 시스템에서 자료 불일치 점검에 실패하더라도 마운트를 중지하
지 않는다.
iso9660 화일 시스템에 대한 옵션
Normal iso9660 화일명이 8.3 형식으로 나타나게 한다.( 즉 DOS 식 화 일 명
제 한을 사용한다. ) 그리고 모두 대문자로 표시되게 한다. 또한 소유권, 허
가권, 링크 수, 블럭/문자장치 표시 등의 필드를 없앤다.
락 릿지(Rock Ridge)는 iso9660 시스템에 유닉스의 모든 기능을 제공하는 확
장기능이다. 기본적으로 각 디렉토리마다 추가 정보를 위한 공간이 마련되어
있기때문에 락 릿지를 사용하면 유닉스 화일 시스템과 거의 구별할 수 없 을
정도로된다.( 물론 읽기 전용이지만 )
norock 락 릿지가 가능해도 그것을 사용하지 않게 한다. Cf. map.
check=r[elaxed] / check=s[trict]
check=relaxed 옵션과 같이 쓰이면 화일명이 우선 소문자로 변환된
다. norock 와 map=normal 이 같이 쓰일 때만 의미를 갖는다. ( 기
본값: check=strict.)
uid=value 와 gid=value
화 일 시스템의 모든 화일에 주어진 UID, GID 를 부여한다. 락 릿지
확장 기능의 정보를 덮어쓸 수 있다. (기본값: uid=0,gid=0.)
map=n[ormal] / map=o[ff]
락 릿지가 아닌 시스템에 대하여 대문자를 소문자로 변환하고 끝 에
나오는 ‘;1’ 문자를 떼어내고 ‘;’는 ‘.’로 변환한다. map=off 을 함
께 사용하면 화일명 변환이 이뤄지지 않는다. norock. 을 보기 바
란다. (기본값: map=normal.)
mode=value
락 릿지 아닌 시스템에서 모든 화일에 주어진 모드를 설정한다. (기
본값: 모든 사람에게 읽기 허가권 )
unhide 히든 화일, 관련 화일 또한 보여준다.
block=[512|1024|2048]
블럭 사이즈를 주어진 값을 설정한다. (기본값: block=1024.)
conv=a[uto] / conv=b[inary] / conv=m[text] / conv=t[ext]
(기본값: conv=binary.) 리눅스 버전 1.3.54 이후로 이 옵션은 더
이 상 효력을 발휘하지 않는다. (binary 이외의 설정은 매우 위험하
다.)
cruft 화일 길이의 상위 바이트에 다른 무의미한 정보가 들어있는 경우, 이
옵 션 을 주어서 화일 길이의 상위 비트를 무시하도록 한다. 이렇게
하면 화일은 16 메가를 넘어갈 수 없다. 전체 시디롬이 음수 또 는
800 메가 이상의 이상한 크기를 갖는 경우에 ‘cruft’ 옵션이 자동으
로 사용된다. 또한 볼륨 시퀀스 번호가 0 또는 1이아닌 경우에도 자
동으로 사용된다.
minix 화일 시스템에 대한 옵션
없음.
화일 시스템에 대한 옵션
fat 화일 시스템에 대한 옵션을 보기 바란다. msdos 화일 시스템에 어떤 이
상이 있는 경우 에러를 내고 읽기 전용으로 만든다. 다시 마운트하면 쓰 기
가 가능하다.
ncp 화일 시스템에 대한 옵션
nfs 와 마찬가지로 ncp 는 마운트 시 바이너리 옵션을 필요로 한다.( struct
ncp_mount_data) 전달인수는 ncpmount(8) 에 의해 만들어지고 현재 버 전 의
mount (2.5k) 는 ncp 에 대한 것을 인식하지 못한다.
nfs 화일 시스템에 대한 옵션
텍 스트 옵션을 쓰지 않고 nfs 화일 시스템은 struct nfs_mount_data 자료형
의 바이너리 옵션을 필요로 한다. mount 프로그램은 ‘tag=value’라는 형 식
으 로 처 리하고 위에서 말한 구조체에값을 설정한다. rsize=n, wsize=n,
timeo=n, retrans=n, acregmin=n, acregmax=n, acdirmin=n, acdirmax=n,
actimeo=n, retry=n, port=n, mountport=n, mounthost=name, mountprog=n,
mountvers=n, nfsprog=n, nfsvers=n, namlen=n. The option addr=n 을 쓸
수 는 있으나 무시된다. 다음의 논리적 참거짓(Boolean) 옵션 앞에는 no 를
붙일 수 있다: bg, fg, soft, hard, intr, posix, cto, ac, tcp, udp. 세부
사항은 nfs(5) 을 보기 바란다.
특별히 유용한 옵션으로는 다음이 있다.
rsize=8192,wsize=8192
기 본 버터 사이트 1024 보다는 더 빠른 접속 속도를 위해 필요하다.
soft 이 옵션을 주면 일정 시간 동안 반응하지 않는 nfs 서버에 대해서 는
타임아웃이걸리도록 하며 그렇지 않은 경우 계속 마운트하고 있는다.
시간 설정은 timeo=time 을 사용한다. 이 옵션은 때때로 여러 분 의
nfs 서버가 반응하지 않거나 서버로부터 화일을 받는도중 리부팅할
때 사용된다.
proc 화일 시스템에 대한 옵션
uid=value 와 gid=value
인식을 하지만 본인이 보기에 어떤 다른 영향도 미치지 않는다.
smb 화일 시스템에 대한 옵션
nfs와 마찬가지로, smb 또한 바이너리 전달인수를 필요로 한다. ( struct
smb_mount_data) smbmount(8) 명령을 가지고 만들 수 있으며 현재 버전의
mount (2.5k) 은 smb 에 대한 것을 인식하지 않는다.
sysv 화일 시스템에 대한 옵션
없음.
ufs 화일 시스템에 대한 옵션
없음.
umsdos 화일 시스템에 대한 옵션
msdos 에 대한 옵션을 보기 바람.
vfat 화일 시스템에 대한 옵션
일단 fat 에 대한 옵션을 인식하며 다음 옵션도 사용가능하다.
uni_xlate
처리되지 않는 유니코드 문자를 특수한 이스케이프 시퀀스로 변환 한
다. 유니코드 문자로 화일명을 쓴 화일을 백업/복원할 수 있도록 해
준다. 이 옵션이 없는 경우 ’?’이라는 문자가 사용된다. vfat 화 일
시스템에서는이스케이프 문자를 ’:’으로 사용한다. u 가 유니코드 ㅁ
누자라면 이스케이프시퀀스는 다음과 같다.
’:’, (u & 0x3f), ((u>>6) & 0x3f), (u>>12).
posix 대소문자만 다른 화일명을 허용한다.
nonumtail
name~num.ext 라는 화일명을 쓰기 전에시퀀스 번호를 사용하지 않 는
짧은 이름을 먼저 시도해본다.
xenix 화일 시스템에 대한 옵션
없음.
xiafs 화일 시스템에 대한 옵션
없음. xiafs 에 어떤 문제가 있는 것은 아니지만 많이 사용되고 있지 않으며
관리도 되고 있지 않다. 이것을 사용하지 말기 바란다.
루프 장치(THE LOOP DEVICE)
또 다른 타입 중 하나로서 루트 장치를 통한 마운트를 들 수 있다. 예를 들
어, 다음과 같이 한다고 하자.
mount /tmp/fdimage /mnt -t msdos -o loop=/dev/loop3,blocksize=1024
이 명령은 루프 장치인 /dev/loop3 을 /tmp/fdimage 이라는 화일에 연관시킨
다. 그리고 나서 이 장치를 /mnt 에 마운트한다. 다음 3 가지 옵션을 인 식
한다. loop, offset 와 encryption 이 옵션들은 실제로는 losetup(8) 에 대
한 옵션이라 할 수 있다. If no explicit loop device is mentioned 루 프
장 치가 명시되지 않으면 ( 또는 ‘-o loop’ 라는 옵션만 주면), mount 는 사
용되지 않은 루프 장치를 찾아서 사용한다.
관련 화일
/etc/fstab 화일 시스템 테이블
/etc/mtab 마운트된 화일 시스템에 대한 테입르
/etc/mtab~ 잠금(lock) 화일
/etc/mtab.tmp 임시 화일
참고
mount(2), umount(2), fstab(5), umount(8), swapon(8), nfs(5), mountd(8),
nfsd(8), mke2fs(8), tune2fs(8), losetup(8)
버그
깨진 화일 시스템을 사용하는 경우 시스템 다운이 될 수도 있다.
몇 가지 리눅스 화일 시스템은 -o sync (ext2fs는 sync 옵션을 사용하여 마
운트하는 경우동기적 갱신( BSD에서처럼 )을 지원함 )
-o remount 를 통하여 마운트 파라미터에 변화를 줄 수 있다.(모든 sb 를 제
외한 ext2fs 화일 시스템의 모든 파라미터 값을 바굴 수 있다. 하지만 fatfs
에 대해서는 gid 또는 umask 를 변경할 수 없다)
HISTORY
A mount 명령은 AT&T UNIX 버전 6 에서 생겼다.
번역자
리눅스 버전 2.0 1996년 7월 5일 MOUNT(8)
