btrfs: sysfs: add force_chunk_alloc trigger to force allocation

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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 <shr@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ 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 <dsterba@suse.com>

...

This commit is contained in:

Stefan Roesch 2022-02-08 11:31:22 -08:00 • committed by David Sterba

parent 19fc516a51

commit 22c55e3bbb

1 changed files with 53 additions and 0 deletions

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fs/btrfs/sysfs.c

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