Commit 90519d66 authored by Arne Jansen's avatar Arne Jansen
Browse files

btrfs: state information for readahead 



Add state information for readahead to btrfs_fs_info and btrfs_device

Changes v2:
 - don't wait in radix_trees
 - add own set of workers for readahead

Reviewed-by: default avatarJosef Bacik <josef@redhat.com>
Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
parent ab0fff03

fs/btrfs/ctree.h

+5 −0
Original line number Diff line number Diff line
@@ -1036,6 +1036,7 @@ struct btrfs_fs_info { 
	struct btrfs_workers endio_freespace_worker;

	struct btrfs_workers submit_workers;

	struct btrfs_workers caching_workers;

	struct btrfs_workers readahead_workers;



	/*

	 * fixup workers take dirty pages that didn't properly go through
@@ -1119,6 +1120,10 @@ struct btrfs_fs_info { 
	u64 fs_state;



	struct btrfs_delayed_root *delayed_root;



	/* readahead tree */

	spinlock_t reada_lock;

	struct radix_tree_root reada_tree;

};



/*

fs/btrfs/disk-io.c

+10 −0
Original line number Diff line number Diff line
@@ -1711,6 +1711,10 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
	fs_info->defrag_inodes = RB_ROOT;

	fs_info->trans_no_join = 0;



	/* readahead state */

	INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);

	spin_lock_init(&fs_info->reada_lock);



	fs_info->thread_pool_size = min_t(unsigned long,

					  num_online_cpus() + 2, 8);
@@ -1903,6 +1907,9 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
	btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta",

			   fs_info->thread_pool_size,

			   &fs_info->generic_worker);

	btrfs_init_workers(&fs_info->readahead_workers, "readahead",

			   fs_info->thread_pool_size,

			   &fs_info->generic_worker);



	/*

	 * endios are largely parallel and should have a very
@@ -1913,6 +1920,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, 


	fs_info->endio_write_workers.idle_thresh = 2;

	fs_info->endio_meta_write_workers.idle_thresh = 2;

	fs_info->readahead_workers.idle_thresh = 2;



	btrfs_start_workers(&fs_info->workers, 1);

	btrfs_start_workers(&fs_info->generic_worker, 1);
@@ -1926,6 +1934,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
	btrfs_start_workers(&fs_info->endio_freespace_worker, 1);

	btrfs_start_workers(&fs_info->delayed_workers, 1);

	btrfs_start_workers(&fs_info->caching_workers, 1);

	btrfs_start_workers(&fs_info->readahead_workers, 1);



	fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);

	fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
@@ -2650,6 +2659,7 @@ int close_ctree(struct btrfs_root *root) 
	btrfs_stop_workers(&fs_info->submit_workers);

	btrfs_stop_workers(&fs_info->delayed_workers);

	btrfs_stop_workers(&fs_info->caching_workers);

	btrfs_stop_workers(&fs_info->readahead_workers);



	btrfs_close_devices(fs_info->fs_devices);

	btrfs_mapping_tree_free(&fs_info->mapping_tree);

fs/btrfs/volumes.c

+8 −0
Original line number Diff line number Diff line
@@ -366,6 +366,14 @@ static noinline int device_list_add(const char *path, 
		}

		INIT_LIST_HEAD(&device->dev_alloc_list);



		/* init readahead state */

		spin_lock_init(&device->reada_lock);

		device->reada_curr_zone = NULL;

		atomic_set(&device->reada_in_flight, 0);

		device->reada_next = 0;

		INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT);

		INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT);



		mutex_lock(&fs_devices->device_list_mutex);

		list_add_rcu(&device->dev_list, &fs_devices->devices);

		mutex_unlock(&fs_devices->device_list_mutex);

fs/btrfs/volumes.h

+8 −0
Original line number Diff line number Diff line
@@ -92,6 +92,14 @@ struct btrfs_device { 
	struct btrfs_work work;

	struct rcu_head rcu;

	struct work_struct rcu_work;



	/* readahead state */

	spinlock_t reada_lock;

	atomic_t reada_in_flight;

	u64 reada_next;

	struct reada_zone *reada_curr_zone;

	struct radix_tree_root reada_zones;

	struct radix_tree_root reada_extents;

};



struct btrfs_fs_devices {

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