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| author | Karel Zak | 2019-01-22 10:02:17 +0100 |
|---|---|---|
| committer | Karel Zak | 2019-01-22 10:02:17 +0100 |
| commit | 1895c76f741a9cb85f83b333dbf0079528d254f0 (patch) | |
| tree | 9bfbe5fa9ac17f2fe48c850d07a8fdf9e1b25d06 /disk-utils | |
| parent | swapon: (man) iomap for swapfile is already supported by kernel (diff) | |
| download | kernel-qcow2-util-linux-1895c76f741a9cb85f83b333dbf0079528d254f0.tar.gz kernel-qcow2-util-linux-1895c76f741a9cb85f83b333dbf0079528d254f0.tar.xz kernel-qcow2-util-linux-1895c76f741a9cb85f83b333dbf0079528d254f0.zip | |
swapon: rewrite section about swapfiles
* don't duplicate info on two places -- let's keep only small note
in mkswap(8) man page, suggest to read swapon(8) man page
* add info about kernel versions for XFS and Btrfs swapfiles support
* use subsection in the NOTES
Addresses: https://github.com/karelzak/util-linux/issues/633
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'disk-utils')
| -rw-r--r-- | disk-utils/mkswap.8 | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/disk-utils/mkswap.8 b/disk-utils/mkswap.8 index 7b6a02746..e9bd9ccfa 100644 --- a/disk-utils/mkswap.8 +++ b/disk-utils/mkswap.8 @@ -130,20 +130,11 @@ e.g.\& using a command like to create 8GiB swapfile. -The swap file implementation in the kernel expects to be able to write to the file directly, -without the assistance of the filesystem. This is a problem on files with holes -(e.g. created by -.BR cp (1) -or another commands), or on files on copy-on-write filesystems like -.BR btrfs . -In some cases preallocated files (e.g. fallocate(1) on XFS) maybe interpreted -by old kernel versions as files with holes too. The most portable solution is to use -.BR dd (1) -and /dev/zero in these cases. -.sp Please read notes from .BR swapon (8) -before adding a swap file to copy-on-write filesystems. +about +.B the swap file use restrictions +(holes, preallocation and copy-on-write issues). .SH ENVIRONMENT .IP LIBBLKID_DEBUG=all |