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introduce __sb_writers_{acquired,release}() helpers
Preparation to hide the sb->s_writers internals from xfs and btrfs. Add 2 trivial define's they can use rather than play with ->s_writers directly. No changes in btrfs/transaction.o and xfs/xfs_aops.o. Signed-off-by: Oleg Nesterov <[email protected]> Reviewed-by: Jan Kara <[email protected]>
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