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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILESYSTEM SUPPORT | NOTES | AUTHORS | SEE ALSO | AVAILABILITY | COLOPHON |
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FSFREEZE(8) System Administration FSFREEZE(8)
fsfreeze - suspend access to a filesystem (Ext3/4, ReiserFS, JFS,
XFS)
fsfreeze --freeze|--unfreeze mountpoint
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)).
-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.
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.
This man page is based on xfs_freeze(8).
Written by Hajime Taira.
mount(8)
The fsfreeze command is part of the util-linux package and is
available from
https://www.kernel.org/pub/linux/utils/util-linux/.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found
at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you
have a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
util-linux July 2014 FSFREEZE(8)
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