[0/3] fsstress: add support for btrfs subvol and snapshot ops

Message

Josef Bacik Nov. 14, 2019, 3:58 p.m. UTC

For btrfs it would be nice to exercise our subvol and snapshot operations with
fsstress as well.  The set of patches adds this ability.  I've added a new file
type for subvolumes, and they behave just like directories for all intents and
purposes.  The bulk of the supporting code needed for this went into the first
patch, as well as the code to add the ability to link in libbtrfsutil.  The
second patch is more straightforward as it just adds the snapshot operation, and
the final patch goes through and makes everybody pick either a directory or
subvolume for their target file.  I've done a bunch of testing with this on
btrfs to make sure everything works as expected.  I then did a follow up run on
xfs to verify I didn't break the non-btrfs case.  Thanks,

Josef