btrfs-progs: fi mkswapfile: fix page count in header

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Per user report on https://old.reddit.com/r/btrfs/comments/107fnw1/btrfs_filesystem_mkswapfile_results_in_an/
the swapfile header does not contain the correct number of pages that
matches the file size and the activated swapfile is only 1GiB:

  # btrfs filesystem mkswapfile -s 10g swapfile
  # swapon swapfile
  # cat /proc/swaps
  Filename          Type    Size       Used    Priority
  /swap/swapfile    file    1048572    0       -2

A workaround is to run 'mkswap swapfile' before activation. Proper fix
is to calculate the number of (fixed size) 4K pages available for the
swap.

Issue: #568
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2023-01-09 18:22:56 +01:00

parent 660d10d3fb

commit 54b90cb6e5

2 changed files with 34 additions and 12 deletions

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