Re: Adding file swap on btrfs

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On Mon, Dec 19, 2022 at 2:58 PM Neal Becker <ndbecker2@xxxxxxxxx> wrote:
I've just installed f37 on a new lenovo x1 carbon.
One thing, the installation didn't setup any swap (other than zswap).

After a bit of reading I found
sudo btrfs filesystem mkswapfile -s 32G /swapfile
But:
 sudo swapon -v /swapfile
swapon: /swapfile: found signature [pagesize=4096, signature=swap]
swapon: /swapfile: pagesize=4096, swapsize=1073741824, devsize=34359738368

Although I created 32G swapfile, only 1G is used.
swapon
NAME       TYPE       SIZE USED PRIO
/dev/zram0 partition    8G 6.3M  100
/swapfile  file      1024M   0B   -2


What's wrong?

Thanks,
Neal

Something wrong with btrfs filesystem mkswap.  If I do it the old-fashioned way:
# truncate -s 0 swapfile
# chattr +C swapfile
# fallocate -l 2G swapfile
# chmod 0600 swapfile
# mkswap swapfile
# swapon swapfile
It works correctly
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