SunOS man pages : mount_ufs (1)
Maintenance Commands mount_ufs(1M)
NAME
mount_ufs - mount ufs file systems
SYNOPSIS
mount -F ufs [ generic_options ] [ -o specific_options ]
[ -O ] special | mount_point
mount -F ufs [ generic_options ] [ -o specific_options ]
[ -O ] special mount_point
DESCRIPTION
The mount utility attaches a ufs file system to the file
system hierarchy at the mount_point, which is the pathname
of a directory. If mount_point has any contents prior to
the mount operation, these are hidden until the file system
is unmounted.
If mount is invoked with special or mount_point as the only
arguments, mount will search /etc/vfstab to fill in the
missing arguments, including the specific_options. See
mount(1M).
If special and mount_point are specified without any
specific_options, the default is rw.
If the directory on which a file system is to be mounted is
a symbolic link, the file system is mounted on the directory
to which the symbolic link refers, rather than on top of the
symbolic link itself.
OPTIONS
See mount(1M) for the list of supported generic_options.
The following options are supported:
-o specific_options
Specify ufs file system specific options in a
comma-separated list with no intervening spaces.
If invalid options are specified, a warning mes-
sage is printed and the invalid options are
ignored. The following options are available:
noatime
By default, the file system is mounted with
normal access time
(atime) recording. If noatime is
specified, the file system will ignore
access time updates on files, except when
they coincide with updates to the ctime or
mtime. See stat(2). This option reduces
disk activity on file systems where access
times are unimportant (for example, a
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Usenet news spool).
noatime turns off access time recording
regardless of dfratime or nodfratime.
dfratime | nodfratime
By default, writing access time updates to
the disk may be deferred (dfratime) for the
file system until the disk is accessed for
a reason other than updating access times.
nodfratime disables this behavior.
forcedirectio | noforcedirectio
If forcedirectio is specified and sup-
ported by the file system, then for the
duration of the mount forced direct I/O
will be used. If the filesystem is mounted
using forcedirectio, then data is
transferred directly between user address
space and the disk. If the filesystem is
mounted using noforcedirectio, then data
is buffered in kernel address space when
data is transferred between user address
space and the disk. forcedirectio is a per-
formance option that benefits only from
large sequential data transfers. The
default behavior is noforcedirectio.
global | noglobal
If global is specified and supported on the
file system, and the system in question is
part of a cluster, the file system will be
globally visible on all nodes of the clus-
ter. If noglobal is specified, the mount
will not be globally visible. The default
behavior is noglobal.
intr|nointr
Allow (do not allow) keyboard interrupts to
kill a process that is waiting for an
operation on a locked file system. The
default is intr.
largefiles | nolargefiles
If nolargefiles is specified and supported
by the file system, then for the duration
of the mount it is guaranteed that all reg-
ular files in the file system have a size
that will fit in the smallest object of
type off_t supported by the system perform-
ing the mount. The mount will fail if there
are any files in the file system not
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Maintenance Commands mount_ufs(1M)
meeting this criterion. If largefiles is
specified, there is no such guarantee. The
default behavior is largefiles.
If nolargefiles is specified, mount will
fail for ufs if the file system to be
mounted has contained a large file (a file
whose size is greater than or equal to 2
Gbyte) since the last invocation of fsck on
the file system. The large file need not be
present in the file system at the time of
the mount for the mount to fail; it could
have been created previously and destroyed.
Invoking fsck (see fsck_ufs(1M)) on the
file system will reset the file system
state if no large files are present. After
invoking fsck, a successful mount of the
file system with nolargefiles specified
indicates the absence of large files in the
file system; an unsuccessful mount attempt
indicates the presence of at least one
large file.
logging | nologging
If logging is specified, then logging is
enabled for the duration of the mounted
file system. Logging is the process of
storing transactions (changes that make up
a complete UFS operation) in a log before
the transactions are applied to the file
system. Once a transaction is stored, the
transaction can be applied to the file sys-
tem later. This prevents file systems from
becoming inconsistent, therefore eliminat-
ing the need to run fsck. And, because
fsck can be bypassed, logging reduces the
time required to reboot a system if it
crashes, or after an unclean halt. The
default behavior is nologging.
The log is allocated from free blocks on
the file system, and is sized approximately
1 Mbyte per 1 Gbyte of file system, up to a
maximum of 64 Mbytes. Logging can be
enabled on any UFS, including root (/).
The log created by UFS logging is continu-
ally flushed as it fills up. The log is
totally flushed when the file system is
unmounted or as a result of the lockfs -f
command.
m Mount the file system without making an
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entry in /etc/mnttab.
onerror=action
This option specifies the action that UFS
should take to recover from an internal
inconsistency on a file system. Specify
action as panic, lock, or umount. These
values cause a forced system shutdown, a
file system lock to be applied to the file
system, or the file system to be forcibly
unmounted, respectively. The default is
panic.
quota Quotas are turned on for the file system.
remount
Remounts a read-only file system as read-
write (using the rw option). This option
can be used only in conjunction with the
f, logging|nologging, m, and noatime
options. This option works only on
currently mounted read-only file systems.
rq Read-write with quotas turned on.
Equivalent to rw, quota.
ro | rw
Read-only or read-write. Default is rw.
suid | nosuid
Allow or disallow setuid execution. The
default is suid. This option can also be
used when mounting devices.
-O Overlay mount. Allow the file system to be
mounted over an existing mount point, making the
underlying file system inaccessible. If a mount
is attempted on a pre-existing mount point
without setting this flag, the mount will fail,
producing the error "device busy".
FILES
/etc/mnttab
table of mounted file systems
/etc/vfstab
list of default parameters for each file system
ATTRIBUTES
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See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
fsck(1M), fsck_ufs(1M), mount(1M), mountall(1M), mount(2),
stat(2), mnttab(4), vfstab(4), attributes(5), largefile(5)
NOTES
Since the root (/) file system is mounted read-only by the
kernel during the boot process, only the remount option
(and options that can be used in conjunction with remount)
affect the root (/) entry in the /etc/vfstab file.
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