f2fs: use spinlock rather than mutex for better speed
With the 2 previous changes, all the long time operations are moved out of the protection region, so here we can use spinlock rather than mutex (orphan_inode_mutex) for lower overhead. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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