btrfs: remove unused raid56 functions which were dedicated for scrub

Since the scrub rework, the following RAID56 functions are no longer
called:

- raid56_add_scrub_pages()
- raid56_alloc_missing_rbio()
- raid56_submit_missing_rbio()

Those functions are all utilized by scrub to handle missing device cases
for RAID56.

However the new scrub code handle them in a completely different way:

- If it's data stripe, go recovery path through btrfs_submit_bio()
- If it's P/Q stripe, it would be handled through
  raid56_parity_submit_scrub_rbio()
  And that function would handle dev-replace and repair properly.

Thus we can safely remove those functions.

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

1 files changed, 0 insertions, 7 deletions

diff --git a/fs/btrfs/raid56.h b/fs/btrfs/raid56.h
index 6583c225b1bd..0f7f31c8cb98 100644
--- a/fs/btrfs/raid56.h
+++ b/fs/btrfs/raid56.h
@@ -187,19 +187,12 @@ void raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
 			   int mirror_num);
 void raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc);
 
-void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
-			    unsigned int pgoff, u64 logical);
-
 struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio,
 				struct btrfs_io_context *bioc,
 				struct btrfs_device *scrub_dev,
 				unsigned long *dbitmap, int stripe_nsectors);
 void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
 
-struct btrfs_raid_bio *
-raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc);
-void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
-
 int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
 void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);