Commit e3cb339f authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: export the caching control helpers 



Man a lot of people use this stuff.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6f410d1b

fs/btrfs/block-group.h

+3 −0
Original line number Diff line number Diff line
@@ -170,6 +170,9 @@ void btrfs_wait_block_group_cache_progress(struct btrfs_block_group_cache *cache 
int btrfs_wait_block_group_cache_done(struct btrfs_block_group_cache *cache);

int btrfs_cache_block_group(struct btrfs_block_group_cache *cache,

			    int load_cache_only);

void btrfs_put_caching_control(struct btrfs_caching_control *ctl);

struct btrfs_caching_control *btrfs_get_caching_control(

		struct btrfs_block_group_cache *cache);



static inline int btrfs_block_group_cache_done(

		struct btrfs_block_group_cache *cache)

fs/btrfs/extent-tree.c

+18 −18
Original line number Diff line number Diff line
@@ -182,8 +182,8 @@ static int exclude_super_stripes(struct btrfs_block_group_cache *cache) 
	return 0;

}



static struct btrfs_caching_control *

get_caching_control(struct btrfs_block_group_cache *cache)

struct btrfs_caching_control *btrfs_get_caching_control(

		struct btrfs_block_group_cache *cache)

{

	struct btrfs_caching_control *ctl;
@@ -199,7 +199,7 @@ get_caching_control(struct btrfs_block_group_cache *cache) 
	return ctl;

}



static void put_caching_control(struct btrfs_caching_control *ctl)

void btrfs_put_caching_control(struct btrfs_caching_control *ctl)

{

	if (refcount_dec_and_test(&ctl->count))

		kfree(ctl);
@@ -455,7 +455,7 @@ static noinline void caching_thread(struct btrfs_work *work) 


	wake_up(&caching_ctl->wait);



	put_caching_control(caching_ctl);

	btrfs_put_caching_control(caching_ctl);

	btrfs_put_block_group(block_group);

}
@@ -504,7 +504,7 @@ int btrfs_cache_block_group(struct btrfs_block_group_cache *cache, 
		schedule();



		finish_wait(&ctl->wait, &wait);

		put_caching_control(ctl);

		btrfs_put_caching_control(ctl);

		spin_lock(&cache->lock);

	}
@@ -557,7 +557,7 @@ int btrfs_cache_block_group(struct btrfs_block_group_cache *cache, 


		wake_up(&caching_ctl->wait);

		if (ret == 1) {

			put_caching_control(caching_ctl);

			btrfs_put_caching_control(caching_ctl);

			btrfs_free_excluded_extents(cache);

			return 0;

		}
@@ -579,7 +579,7 @@ int btrfs_cache_block_group(struct btrfs_block_group_cache *cache, 
	}



	if (load_cache_only) {

		put_caching_control(caching_ctl);

		btrfs_put_caching_control(caching_ctl);

		return 0;

	}
@@ -4153,7 +4153,7 @@ static int __exclude_logged_extent(struct btrfs_fs_info *fs_info, 
		return -EINVAL;



	btrfs_cache_block_group(block_group, 0);

	caching_ctl = get_caching_control(block_group);

	caching_ctl = btrfs_get_caching_control(block_group);



	if (!caching_ctl) {

		/* Logic error */
@@ -4183,7 +4183,7 @@ static int __exclude_logged_extent(struct btrfs_fs_info *fs_info, 
		}

out_lock:

		mutex_unlock(&caching_ctl->mutex);

		put_caching_control(caching_ctl);

		btrfs_put_caching_control(caching_ctl);

	}

	btrfs_put_block_group(block_group);

	return ret;
@@ -4306,7 +4306,7 @@ void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info) 
		if (btrfs_block_group_cache_done(cache)) {

			cache->last_byte_to_unpin = (u64)-1;

			list_del_init(&caching_ctl->list);

			put_caching_control(caching_ctl);

			btrfs_put_caching_control(caching_ctl);

		} else {

			cache->last_byte_to_unpin = caching_ctl->progress;

		}
@@ -4937,14 +4937,14 @@ void btrfs_wait_block_group_cache_progress(struct btrfs_block_group_cache *cache 
{

	struct btrfs_caching_control *caching_ctl;



	caching_ctl = get_caching_control(cache);

	caching_ctl = btrfs_get_caching_control(cache);

	if (!caching_ctl)

		return;



	wait_event(caching_ctl->wait, btrfs_block_group_cache_done(cache) ||

		   (cache->free_space_ctl->free_space >= num_bytes));



	put_caching_control(caching_ctl);

	btrfs_put_caching_control(caching_ctl);

}



int btrfs_wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
@@ -4952,14 +4952,14 @@ int btrfs_wait_block_group_cache_done(struct btrfs_block_group_cache *cache) 
	struct btrfs_caching_control *caching_ctl;

	int ret = 0;



	caching_ctl = get_caching_control(cache);

	caching_ctl = btrfs_get_caching_control(cache);

	if (!caching_ctl)

		return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0;



	wait_event(caching_ctl->wait, btrfs_block_group_cache_done(cache));

	if (cache->cached == BTRFS_CACHE_ERROR)

		ret = -EIO;

	put_caching_control(caching_ctl);

	btrfs_put_caching_control(caching_ctl);

	return ret;

}
@@ -7482,7 +7482,7 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info) 
		caching_ctl = list_entry(info->caching_block_groups.next,

					 struct btrfs_caching_control, list);

		list_del(&caching_ctl->list);

		put_caching_control(caching_ctl);

		btrfs_put_caching_control(caching_ctl);

	}

	up_write(&info->commit_root_sem);
@@ -8202,7 +8202,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 
	}



	if (block_group->has_caching_ctl)

		caching_ctl = get_caching_control(block_group);

		caching_ctl = btrfs_get_caching_control(block_group);

	if (block_group->cached == BTRFS_CACHE_STARTED)

		btrfs_wait_block_group_cache_done(block_group);

	if (block_group->has_caching_ctl) {
@@ -8223,8 +8223,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 
		up_write(&fs_info->commit_root_sem);

		if (caching_ctl) {

			/* Once for the caching bgs list and once for us. */

			put_caching_control(caching_ctl);

			put_caching_control(caching_ctl);

			btrfs_put_caching_control(caching_ctl);

			btrfs_put_caching_control(caching_ctl);

		}

	}

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