Commit 225948de authored by David Sterba's avatar David Sterba
Browse files

btrfs: add assertion helpers for spinning readers 



Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_readers constraints are met. Will be used in followup patches.

Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 843ccf9f

fs/btrfs/locking.c

+13 −0
Original line number Diff line number Diff line
@@ -32,10 +32,23 @@ static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) 
	WARN_ON(atomic_read(&eb->spinning_writers));

}



static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb)

{

	atomic_inc(&eb->spinning_readers);

}



static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb)

{

	WARN_ON(atomic_read(&eb->spinning_readers) == 0);

	atomic_dec(&eb->spinning_readers);

}



#else

static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { }

static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { }

static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { }

static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { }

static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { }

#endif



void btrfs_set_lock_blocking_read(struct extent_buffer *eb)

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