btrfs: tweak free space tree bitmap allocation
The requested bitmap size varies, observed numbers were < 4K up to 16K.
Using vmalloc unconditionally would be too heavy, we'll try contiguous
allocations first and fall back to vmalloc if there's no contig memory.
Signed-off-by:
David Sterba <dsterba@suse.com>
parent
8cce83ba
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