btrfs: pass a valid extent map cache pointer to __get_extent_map()

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We can pass a valid em cache pointer down to __get_extent_map() and
drop the validity check. This avoids the special case, the call stacks
are simple:

btrfs_read_folio
  btrfs_do_readpage
    __get_extent_map

extent_readahead
  contiguous_readpages
    btrfs_do_readpage
      __get_extent_map

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

...

This commit is contained in:

David Sterba 2024-02-06 23:45:09 +01:00

parent 5a8a57f9a4

commit 970ea37488

1 changed files with 10 additions and 3 deletions

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13

fs/btrfs/extent_io.c

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