Commit e4e9fd0f authored by David Sterba's avatar David Sterba
Browse files

btrfs: add assertion helpers for spinning writers 



Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_writers 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 8882679e

fs/btrfs/locking.c

+24 −0
Original line number Diff line number Diff line
@@ -14,6 +14,30 @@ 


static void btrfs_assert_tree_read_locked(struct extent_buffer *eb);



#ifdef CONFIG_BTRFS_DEBUG

static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb)

{

	WARN_ON(atomic_read(&eb->spinning_writers));

	atomic_inc(&eb->spinning_writers);

}



static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb)

{

	WARN_ON(atomic_read(&eb->spinning_writers) != 1);

	atomic_dec(&eb->spinning_writers);

}



static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb)

{

	WARN_ON(atomic_read(&eb->spinning_writers));

}



#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) { }

#endif



void btrfs_set_lock_blocking_read(struct extent_buffer *eb)

{

	/*

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