[PATCH] btrfs: remove unused btrfs_io_stripe::length

[David Sterba <dsterba@suse.com>]

First added (but not effectively used) in 02c372e1f016e5 ("btrfs: add
support for inserting raid stripe extents"). The structure is
initialized to zeros so the only use in btrfs_insert_one_raid_extent()

    u64 length = bioc->stripes[i].length;
    struct btrfs_raid_stride *raid_stride = &stripe_extent->strides[i];

    if (length == 0)
            length = bioc->size;

the 'if' always happens.

Last use in 4016358e852861 ("btrfs: remove unused variable length in
btrfs_insert_one_raid_extent()") was an obvious cleanup. It seems to be
safe to remove, raid-stripe-tree works without using it since 6.6.

This was found by tool https://github.com/jirislaby/clang-struct .

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/volumes.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 0e793b9776d677..d06d2d8713f87f 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -473,7 +473,6 @@ struct btrfs_io_stripe {
 	struct btrfs_device *dev;
 	/* Block mapping. */
 	u64 physical;
-	u64 length;
 	bool rst_search_commit_root;
 	/* For the endio handler. */
 	struct btrfs_io_context *bioc;
-- 
2.49.0