SunOS man pages : lockfs (1)
Maintenance Commands lockfs(1M)
NAME
lockfs - change or report file system locks
SYNOPSIS
/usr/sbin/lockfs [ -adefhnuw ] [ -c string ] [ file-system
... ]
DESCRIPTION
lockfs is used to change and report the status of file sys-
tem locks. lockfs reports the lock status and unlocks the
file systems that were improperly left locked by an applica-
tion such as ufsdump(1M). This could occur if ufsdump(1M) is
killed using kill(1).
Using lockfs to lock a file system is discouraged because
this requires extensive knowledge of SunOS internals to be
used effectively and correctly.
When invoked with no arguments, lockfs lists the UFS file
systems that are locked. If file-system is not specified,
and -a is specified, lockfs is run on all mounted, UFS type
file systems.
OPTIONS
The following options are supported. You must be super-user
to use any of the following options, with the exception of
-a.
-a Apply command to all mounted, UFS type file systems.
file-system is ignored when -a is specified.
-c string
Accept a string that is passed as the comment field.
The -c only takes affect when the lock is being set
using the -d, -h, -n, -u, or -w options.
-d delete-lock (dlock) the specified file-system. dlock
suspends access that could remove directory entries.
-e error-lock (elock) the specified file-system. elock
blocks all local access to the locked file system and
returns EWOULDBLOCK on all remote access. File systems
are elocked by UFS on detection of internal incon-
sistency. They may only be unlocked after successful
repair by fsck, which is usually done automatically
(see mount_ufs(1M)). elocked file systems can be
unmounted.
-f Flush all transactions out of the log and write the
transactions to the master file system. This option is
valid only if logging has been enabled on the file
system.
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Maintenance Commands lockfs(1M)
-h Hard-lock (hlock) the specified file-system. hlock
returns an error on every access to the locked file
system, and cannot be unlocked. hlocked file systems
can be unmounted.
-n Name-lock (nlock) the specified file-system. nlock
suspends accesses that could change or remove existing
directories entries.
-u Unlock (ulock) the specified file-system. ulock awak-
ens suspended accesses.
-w Write-lock (wlock) the specified file-system. wlock
suspends writes that would modify the file system.
Access times are not kept while a file system is
write-locked.
OPERANDS
The following operands are supported.
file-system
A list of path names separated by white spaces.
USAGE
See largefile(5) for the description of the behavior of
lockfs when encountering files greater than or equal to 2
Gbyte ( 2**31 bytes).
EXAMPLES
Example 1: lockfs with the -a option.
In the following examples, filesystem is the pathname of the
mounted-on directory (mount point). Locktype is one of
"write," "name," "delete," "hard," or "unlock". When
enclosed in parenthesis, the lock is being set. Comment is a
string set by the process that last issued a lock command.
The following example shows the lockfs output when only the
-a option is specified.
example# /usr/sbin/lockfs -a
Filesystem Locktype Comment
/ unlock
/var unlock
example#
Example 2: lockfs with the -w option.
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Maintenance Commands lockfs(1M)
The following example shows the lockfs output when the -w
option is used to write lock the /var file system and the
comment string is set using the -c option. The -a option is
then specified on a separate command line.
example# /usr/sbin/lockfs -w -c "lockfs: write lock example" /var
example# /usr/sbin/lockfs -a
Filesystem Locktype Comment
/ unlock
/var write lockfs: write lock example
example#
Example 3: lockfs with the -u option.
The following example shows the lockfs output when the -u
option is used to unlock the /var file system and the com-
ment string is set using the -c option.
example# /usr/sbin/lockfs -uc "lockfs: unlock example" /var
example# /usr/sbin/lockfs /var
Filesystem Locktype Comment
/var unlock lockfs: unlock example
example#
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
kill(1), mount_ufs(1M), ufsdump(1M), fs_ufs(4), attributes(5)
, largefile(5)
System Administration Guide, Volume 1
DIAGNOSTICS
file system: Not owner
You must be root to use this command.
file system :Deadlock condition detected/avoided
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Maintenance Commands lockfs(1M)
A file is enabled for accounting or swapping, on file
system.
file system: Device busy
Another process is setting the lock on file system.
SunOS 5.8 Last change: 13 Feb 1998 4
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