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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILESYSTEM SUPPORT | NOTES | AUTHORS | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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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 filesystem to be frozen
from new modifications. When this is selected, all ongoing
transactions in the filesystem are allowed to complete, new
write(2) 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.
-h, --help
Display help text and exit.
-V, --version
Display version 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)
For bug reports, use the issue tracker
<https://github.com/util-linux/util-linux/issues>.
The fsfreeze command is part of the util-linux package which can
be downloaded from Linux Kernel Archive
<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
2025-08-11. (At that time, the date of the most recent commit that
was found in the repository was 2025-08-05.) 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 2.42-start-521-ec46 2025-01-16 FSFREEZE(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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