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| author | Karel Zak | 2019-01-22 10:13:54 +0100 |
|---|---|---|
| committer | Karel Zak | 2019-01-22 10:18:12 +0100 |
| commit | 56c2d2904f018e08131bc0ef0c90b6c69b762268 (patch) | |
| tree | 0c4c2fc34b58270cb8bbc61e55792fe0b86cb09b /sys-utils/swapon.8 | |
| parent | swapon: rewrite section about swapfiles (diff) | |
| download | kernel-qcow2-util-linux-56c2d2904f018e08131bc0ef0c90b6c69b762268.tar.gz kernel-qcow2-util-linux-56c2d2904f018e08131bc0ef0c90b6c69b762268.tar.xz kernel-qcow2-util-linux-56c2d2904f018e08131bc0ef0c90b6c69b762268.zip | |
swapon: be more explicit about BTRFS
It seems nocow and nodatasum attributes are required.
See btrfs_swap_activate() in https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ed46ff3d423780fa5173b38a844bf0fdb210a2a7
Addresses: https://github.com/karelzak/util-linux/issues/633
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/swapon.8')
| -rw-r--r-- | sys-utils/swapon.8 | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/sys-utils/swapon.8 b/sys-utils/swapon.8 index 60e4d4feb..d645850bb 100644 --- a/sys-utils/swapon.8 +++ b/sys-utils/swapon.8 @@ -207,9 +207,10 @@ The most portable solution to create a swap file is to use .BR dd (1) and /dev/zero in these cases. .SS Btrfs -The swap files on btrfs are supported since Linux 5.0. The previous versions use -copy-on-write semantic for the swap files, it means that the file location is may not be static -and corruption can result. +The swap files on btrfs are supported since Linux 5.0 on files with nocow and +nodatasum attributes and without compression. The previous versions may use +copy-on-write semantic for the swap files, it means that the file location is +may not be static and corruption can result. .sp One possible workaround is to map the swap file to a loopback device. This will allow the filesystem to determine the mapping properly but may come with a performance impact. |