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btrfs: zoned: cache if block group is on a sequential zone

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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: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-02-04 19:22:03 +09:00 committed by David Sterba
parent 138082f366
commit 08f455593f
3 changed files with 38 additions and 0 deletions
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3
fs/btrfs/block-group.h
View File

@ -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;

29
fs/btrfs/zoned.c
View File

@ -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;
}

6
fs/btrfs/zoned.h
View File

@ -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)