Qu Wenruo 007fa63225 btrfs: get rid of btrfs_read_dev_super() ...

The function is introduced by commit a512bbf855 ("Btrfs: superblock
duplication") at the beginning of btrfs.

It leaved a comment saying we'd need a special mount option to read all
super blocks, but it's never been implemented and there was not
need/request for it. The check/rescue tools are able to start from a
specific copy and use it as primary eventually.

This means btrfs_read_dev_super() is always reading the first super
block, making all the code finding the latest super block unnecessary.

Just remove that function and replace all call sites with
btrfs_read_disk_super(bdev, 0, false).

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

2025-05-15 14:30:50 +02:00

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