btrfs: don't do extra find_extent_buffer() in do_walk_down()

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We do find_extent_buffer(), and then if we don't find the eb in cache we
call btrfs_find_create_tree_block(), which calls find_extent_buffer()
first and then allocates the extent buffer.

The reason we're doing this is because if we don't find the extent
buffer in cache we set reada = 1.  However this doesn't matter, because
lower down we only trigger reada if !btrfs_buffer_uptodate(eb), which is
what the case would be if we didn't find the extent buffer in cache and
had to allocate it.

Clean this up to simply call btrfs_find_create_tree_block(), and then
use the fact that we're having to read the extent buffer off of disk to
go ahead and kick off readahead.

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

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Josef Bacik 2024-05-07 14:12:02 -04:00 • committed by David Sterba

parent 45c4102f0d

commit 58147d5a70

1 changed files with 6 additions and 10 deletions

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fs/btrfs/extent-tree.c

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