fsfreeze -f mountpoint

       fsfreeze -u mountpoint

       fsfreeze suspends and resumes access to an filesystem

       fsfreeze halts 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 filesystem on the device when a snap-
       shot creation is requested.  For more details see  the  dmsetup(8)  man

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

       -h, --help
              Print help and exit.

       -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  con-
              tain  information  on  files  that  are  still in the process of
              unlinking.  These files will not be unlinked until the  filesys-
              tem is unfrozen or a clean mount of the snapshot is complete.

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

       Written by Hajime Taira.

       This man page based on xfs_freeze.  One of -f or -u must be supplied to
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