__link_block_group uses GFP_KERNEL

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Hi guys,

Looks like that current code does GFP_KERNEL allocation inside
__link_block_group.
the function invokes kobject_add and internally creates sysfs files
with the GFP_KERNEL flag set.
But since do_chunk_alloc executes insides the btrfs transaction it's
not allowed to sleep.

Thanks!
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