exfat: introduce bitmap_lock for cluster bitmap access
s_lock which is for protecting concurrent access of file operations is too huge for cluster bitmap protection, so introduce a new bitmap_lock to narrow the lock range if only need to access cluster bitmap. Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
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