btrfs: sysfs: add force_chunk_alloc trigger to force allocation

Adds write-only trigger to force new chunk allocation for a given block
group type. It is at

  /sys/fs/btrfs/<uuid>/allocation/<type>/force_chunk_alloc

Note: this is now only for debugging and testing and is enabled with the
      CONFIG_BTRFS_DEBUG configuration option. The transaction is
      started from sysfs context and can be problematic in some cases.

Signed-off-by: Stefan Roesch <[email protected]>
Reviewed-by: David Sterba <[email protected]>
[ Changes from the original submission:
  - update changelog
  - drop unnecessary error messages
  - switch value to bool and use kstrtobool
  - move BTRFS_ATTR_W definition
  - add comment for using transaction
]
Signed-off-by: David Sterba <[email protected]>

0 files changed, 0 insertions, 0 deletions