(un)lock_kernel() ?

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Why does ext4_fill_super release the BKL on entry and take it on both 
normal and abnormal exit? As far as I can see, ext4_fill_super is called 
by get_sb_bdev, which calls the ->get_sb method without the BKL, and 
ext4_get_sb calls get_sb_bdev without the BKL. And the ext2 code does not 
touch the BKL in ext2_fill_super.

Is the VFS code going to be changed somewhere in the future and it's being 
anticipated, or is this a bug?
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