btrfs: subpage: introduce helpers for writeback status

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Introduces the following functions to handle subpage writeback status:

- btrfs_subpage_set_writeback()
- btrfs_subpage_clear_writeback()
- btrfs_subpage_test_writeback()
  These helpers can only be called when the range is ensured to be
  inside the page.

- btrfs_page_set_writeback()
- btrfs_page_clear_writeback()
- btrfs_page_test_writeback()
  These helpers can handle both regular sector size and subpage without
  problem.

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 2021-03-25 15:14:38 +08:00 • committed by David Sterba

parent d8a5713e89

commit 3470da3b7d

2 changed files with 32 additions and 0 deletions

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fs/btrfs/subpage.c

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2

fs/btrfs/subpage.h

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