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f2fs: add a rw_sem to cover quota flag changes
Two paths to update quota and f2fs_lock_op: 1. - lock_op | - quota_update `- unlock_op 2. - quota_update - lock_op `- unlock_op But, we need to make a transaction on quota_update + lock_op in OnePlusOSS#2 case. So, this patch introduces: 1. lock_op 2. down_write 3. check __need_flush 4. up_write 5. if there is dirty quota entries, flush them 6. otherwise, good to go Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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Jaegeuk Kim
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Jul 12, 2019
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