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introduce __sb_writers_{acquired,release}() helpers

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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 <oleg@redhat.com>
Reviewed-by: Jan Kara <jack@suse.com>
This commit is contained in:
Oleg Nesterov 2015-07-19 23:48:20 +02:00
parent 45e38cff4f
commit bee9182d95
3 changed files with 9 additions and 10 deletions
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5
include/linux/fs.h
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@ -1391,6 +1391,11 @@ extern struct timespec current_fs_time(struct super_block *sb);
void __sb_end_write(struct super_block *sb, int level);
int __sb_start_write(struct super_block *sb, int level, bool wait);
#define __sb_writers_acquired(sb, lev) \
rwsem_acquire_read(&(sb)->s_writers.lock_map[(lev)-1], 0, 1, _THIS_IP_)
#define __sb_writers_release(sb, lev) \
rwsem_release(&(sb)->s_writers.lock_map[(lev)-1], 1, _THIS_IP_)
/**
* sb_end_write - drop write access to a superblock
* @sb: the super we wrote to