Commit 08f45559 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
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btrfs: zoned: cache if block group is on a sequential zone 



On a zoned filesystem, cache if a block group is on a sequential write
only zone.

On sequential write only zones, we can use REQ_OP_ZONE_APPEND for
writing data, therefore provide btrfs_use_zone_append() to figure out if
IO is targeting a sequential write only zone and we can use
REQ_OP_ZONE_APPEND for data writing.

Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 138082f3

fs/btrfs/block-group.h

+3 −0
Original line number Diff line number Diff line
@@ -181,6 +181,9 @@ struct btrfs_block_group { 
	 */

	int needs_free_space;



	/* Flag indicating this block group is placed on a sequential zone */

	bool seq_zone;



	/* Record locked full stripes for RAID5/6 block group */

	struct btrfs_full_stripe_locks_tree full_stripe_locks_root;

fs/btrfs/zoned.c

+29 −0
Original line number Diff line number Diff line
@@ -1101,6 +1101,9 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new) 
		}

	}



	if (num_sequential > 0)

		cache->seq_zone = true;



	if (num_conventional > 0) {

		/*

		 * Avoid calling calculate_alloc_pointer() for new BG. It
@@ -1218,3 +1221,29 @@ void btrfs_free_redirty_list(struct btrfs_transaction *trans) 
	}

	spin_unlock(&trans->releasing_ebs_lock);

}



bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em)

{

	struct btrfs_fs_info *fs_info = inode->root->fs_info;

	struct btrfs_block_group *cache;

	bool ret = false;



	if (!btrfs_is_zoned(fs_info))

		return false;



	if (!fs_info->max_zone_append_size)

		return false;



	if (!is_data_inode(&inode->vfs_inode))

		return false;



	cache = btrfs_lookup_block_group(fs_info, em->block_start);

	ASSERT(cache);

	if (!cache)

		return false;



	ret = cache->seq_zone;

	btrfs_put_block_group(cache);



	return ret;

}

fs/btrfs/zoned.h

+6 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ void btrfs_calc_zone_unusable(struct btrfs_block_group *cache); 
void btrfs_redirty_list_add(struct btrfs_transaction *trans,

			    struct extent_buffer *eb);

void btrfs_free_redirty_list(struct btrfs_transaction *trans);

bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em);

#else /* CONFIG_BLK_DEV_ZONED */

static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,

				     struct blk_zone *zone)
@@ -133,6 +134,11 @@ static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans, 
					  struct extent_buffer *eb) { }

static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }



static inline bool btrfs_use_zone_append(struct btrfs_inode *inode,

					 struct extent_map *em)

{

	return false;

}

#endif



static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)