Provided by: util-linux_2.27.1-6ubuntu2_i386 bug

NAME

       fsfreeze - suspend access to a filesystem (Ext3/4, ReiserFS, JFS, XFS)

SYNOPSIS

       fsfreeze --freeze|--unfreeze mountpoint

DESCRIPTION

       fsfreeze suspends or resumes access to a filesystem.

       fsfreeze  halts  any  new access to the filesystem and creates a stable
       image on disk.  fsfreeze is intended to  be  used  with  hardware  RAID
       devices that support the creation of snapshots.

       fsfreeze  is  unnecessary for device-mapper devices.  The device-mapper
       (and LVM) automatically freezes a  filesystem  on  the  device  when  a
       snapshot  creation  is  requested.  For more details see the dmsetup(8)
       man page.

       The mountpoint argument is the pathname  of  the  directory  where  the
       filesystem  is  mounted.   The  filesystem must be mounted to be frozen
       (see mount(8)).

       Note that access-time updates are also suspended if the  filesystem  is
       mounted  with the traditional atime behavior (mount option strictatime,
       for more details see mount(8)).

OPTIONS

       -f, --freeze
              This option requests the specified a  filesystem  to  be  frozen
              from  new  modifications.   When  this  is selected, all ongoing
              transactions in the filesystem  are  allowed  to  complete,  new
              write  system  calls  are  halted,  other calls which modify the
              filesystem are halted, and all dirty  data,  metadata,  and  log
              information  are  written  to  disk.   Any process attempting to
              write to the  frozen  filesystem  will  block  waiting  for  the
              filesystem to be unfrozen.

              Note  that  even  after  freezing,  the  on-disk  filesystem can
              contain information on files that are still in  the  process  of
              unlinking.    These   files  will  not  be  unlinked  until  the
              filesystem is unfrozen or a  clean  mount  of  the  snapshot  is
              complete.

       -u, --unfreeze
              This  option  is  used  to  un-freeze  the  filesystem and allow
              operations to continue.  Any filesystem modifications that  were
              blocked by the freeze are unblocked and allowed to complete.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

AUTHOR

       Written by Hajime Taira.

NOTES

       This man page is based on xfs_freeze(8).

SEE ALSO

       mount(8)

AVAILABILITY

       The fsfreeze command is part of the util-linux package and is available
       from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.