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Linux 2.6 - man page for fsfreeze (linux section 8)

FSFREEZE(8)									      FSFREEZE(8)

       fsfreeze - suspend access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS).

       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)	automati-
       cally  freezes  filesystem  on the device when a snapshot creation is requested.  For more
       details see the dmsetup(8) man page.

       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 modifica-
	      tions.  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.

       Written by Hajime Taira.

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


       The  fsfreeze  command  is  part  of  the  util-linux  package  and  is	 available   from

					     May 2010				      FSFREEZE(8)

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