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btrfs: can_nocow_file_extent should pass down args->strict from callers

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Commit 619104ba453ad0 ("btrfs: move common NOCOW checks against a file
extent into a helper") changed our call to btrfs_cross_ref_exist() to
always pass false for the 'strict' parameter.  We're passing this down
through the stack so that we can do a full check for cross references
during swapfile activation.

With strict always false, this test fails:

  btrfs subvol create swappy
  chattr +C swappy
  fallocate -l1G swappy/swapfile
  chmod 600 swappy/swapfile
  mkswap swappy/swapfile

  btrfs subvol snap swappy swapsnap
  btrfs subvol del -C swapsnap

  btrfs fi sync /
  sync;sync;sync

  swapon swappy/swapfile

The fix is to just use args->strict, and everyone except swapfile
activation is passing false.

Fixes: 619104ba453ad0 ("btrfs: move common NOCOW checks against a file extent into a helper")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Chris Mason 2023-06-09 10:53:41 -07:00 committed by David Sterba
parent 7833b86595
commit deccae40e4
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -1864,7 +1864,7 @@ static int can_nocow_file_extent(struct btrfs_path *path,
ret = btrfs_cross_ref_exist(root, btrfs_ino(inode),
key->offset - args->extent_offset,
args->disk_bytenr, false, path);
args->disk_bytenr, args->strict, path);
WARN_ON_ONCE(ret > 0 && is_freespace_inode);
if (ret != 0)
goto out;