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btrfs: reada: move reada_extent_put to place after __readahead_hook() 

We can't release reada_extent earlier than __readahead_hook(), because
__readahead_hook() still need to use it, it is necessary to hode a refcnt
to avoid it be freed.

Actually it is not a problem after my patch named:
  Avoid many times of empty loop
It make reada_extent in above line include at least one reada_extctl,
which keeps additional one refcnt for reada_extent.

But we still need this patch to make the code in pretty logic.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2015-12-31 21:07:17 +08:00 committed by David Sterba
parent 1e7970c0f3
commit b257cf5006
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/reada.c
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@ -717,8 +717,6 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
}
logical = re->logical;
reada_extent_put(fs_info, re);
atomic_inc(&dev->reada_in_flight);
ret = reada_tree_block_flagged(fs_info->extent_root, logical,
mirror_num, &eb);
@ -730,6 +728,8 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
if (eb)
free_extent_buffer(eb);
reada_extent_put(fs_info, re);
return 1;
}