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FSFREEZE(8)		     System Administration		   FSFREEZE(8)

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 snap‐
       shot  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 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.

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

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

FILESYSTEM SUPPORT
       This command will work only if  filesystem  supports  has  support  for
       freezing.   List	 of  these  filesystems	 include  (2016-12-18)	btrfs,
       ext2/3/4, f2fs, jfs, nilfs2, reiserfs, and xfs.	Previous list  may  be
       incomplete,  as	more filesystems get support.  If in doubt easiest way
       to know if a filesystem has support is create a	small  loopback	 mount
       and test freezing it.

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 https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux			   July 2014			   FSFREEZE(8)

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