diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2024-10-03 11:43:05 -0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2025-01-13 14:53:15 +0100 |
| commit | cb7de8ee9c50d86c7ea0f48c6bf50bab84613f22 (patch) | |
| tree | 46ebf8236f018a4910b7997ac718c56b2475422f | |
| parent | b1d4d5d1d8cf42a97e2e2bb7e7c2a965cef78dc4 (diff) | |
btrfs: add a comment for new_bytenr in backref_cache_node
Add a comment for this field so we know what it is used for. Previously
we used it to update the backref cache, so people may mistakenly think
it is useless, but in fact exists to make sure the backref cache makes
sense.
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/backref.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h index a810253d7b8a..7220bde1fc31 100644 --- a/fs/btrfs/backref.h +++ b/fs/btrfs/backref.h @@ -318,6 +318,12 @@ struct btrfs_backref_node { u64 bytenr; }; /* Use rb_simple_node for search/insert */ + /* + * This is a sanity check, whenever we COW a block we will update + * new_bytenr with it's current location, and we will check this in + * various places to validate that the cache makes sense, it shouldn't + * be used for anything else. + */ u64 new_bytenr; /* Objectid of tree block owner, can be not uptodate */ u64 owner; |