suspend access to a filesystem (Linux Ext3/4, ReiserFS, JFS, XFS)
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suspends and resumes access to an filesystem
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
is unnecessary for device-mapper devices. The
device-mapper (and LVM) automatically freezes filesystem on
the device when a snapshot creation is requested. For more
details see the dmsetup(8) man page.
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)).
Print help and exit.
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
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
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.
The fsfreeze command is part of the util-linux package and is
available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
This man page based on xfs_freeze. One of -f or -u
must be supplied to fsfreeze.