btrfs: defrag: introduce helper to defrag a contiguous prepared range

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A new helper, defrag_one_locked_target(), introduced to do the real part
of defrag.

The caller needs to ensure both page and extents bits are locked, and no
ordered extent exists for the range, and all writeback is finished.

The core defrag part is pretty straight-forward:

- Reserve space
- Set extent bits to defrag
- Update involved pages to be dirty

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Qu Wenruo 2021-08-06 16:12:37 +08:00 • committed by David Sterba

parent eb793cf857

commit 22b398eeee

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fs/btrfs/ioctl.c

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