diff options
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 82 |
1 files changed, 77 insertions, 5 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 2df4bc77f5b4..0e32abf53b5b 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -332,6 +332,27 @@ static void put_caching_control(struct btrfs_caching_control *ctl) kfree(ctl); } +#ifdef CONFIG_BTRFS_DEBUG +static void fragment_free_space(struct btrfs_root *root, + struct btrfs_block_group_cache *block_group) +{ + u64 start = block_group->key.objectid; + u64 len = block_group->key.offset; + u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ? + root->nodesize : root->sectorsize; + u64 step = chunk << 1; + + while (len > chunk) { + btrfs_remove_free_space(block_group, start, chunk); + start += step; + if (len < step) + len = 0; + else + len -= step; + } +} +#endif + /* * this is only called by cache_block_group, since we could have freed extents * we need to check the pinned_extents for any extents that can't be used yet @@ -388,6 +409,7 @@ static noinline void caching_thread(struct btrfs_work *work) u64 last = 0; u32 nritems; int ret = -ENOMEM; + bool wakeup = true; caching_ctl = container_of(work, struct btrfs_caching_control, work); block_group = caching_ctl->block_group; @@ -400,6 +422,15 @@ static noinline void caching_thread(struct btrfs_work *work) last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); +#ifdef CONFIG_BTRFS_DEBUG + /* + * If we're fragmenting we don't want to make anybody think we can + * allocate from this block group until we've had a chance to fragment + * the free space. + */ + if (btrfs_should_fragment_free_space(extent_root, block_group)) + wakeup = false; +#endif /* * We don't want to deadlock with somebody trying to allocate a new * extent for the extent root while also trying to search the extent @@ -441,7 +472,8 @@ next: if (need_resched() || rwsem_is_contended(&fs_info->commit_root_sem)) { - caching_ctl->progress = last; + if (wakeup) + caching_ctl->progress = last; btrfs_release_path(path); up_read(&fs_info->commit_root_sem); mutex_unlock(&caching_ctl->mutex); @@ -464,7 +496,8 @@ next: key.offset = 0; key.type = BTRFS_EXTENT_ITEM_KEY; - caching_ctl->progress = last; + if (wakeup) + caching_ctl->progress = last; btrfs_release_path(path); goto next; } @@ -491,7 +524,8 @@ next: if (total_found > (1024 * 1024 * 2)) { total_found = 0; - wake_up(&caching_ctl->wait); + if (wakeup) + wake_up(&caching_ctl->wait); } } path->slots[0]++; @@ -501,13 +535,27 @@ next: total_found += add_new_free_space(block_group, fs_info, last, block_group->key.objectid + block_group->key.offset); - caching_ctl->progress = (u64)-1; - spin_lock(&block_group->lock); block_group->caching_ctl = NULL; block_group->cached = BTRFS_CACHE_FINISHED; spin_unlock(&block_group->lock); +#ifdef CONFIG_BTRFS_DEBUG + if (btrfs_should_fragment_free_space(extent_root, block_group)) { + u64 bytes_used; + + spin_lock(&block_group->space_info->lock); + spin_lock(&block_group->lock); + bytes_used = block_group->key.offset - + btrfs_block_group_used(&block_group->item); + block_group->space_info->bytes_used += bytes_used >> 1; + spin_unlock(&block_group->lock); + spin_unlock(&block_group->space_info->lock); + fragment_free_space(extent_root, block_group); + } +#endif + + caching_ctl->progress = (u64)-1; err: btrfs_free_path(path); up_read(&fs_info->commit_root_sem); @@ -607,6 +655,22 @@ static int cache_block_group(struct btrfs_block_group_cache *cache, } } spin_unlock(&cache->lock); +#ifdef CONFIG_BTRFS_DEBUG + if (ret == 1 && + btrfs_should_fragment_free_space(fs_info->extent_root, + cache)) { + u64 bytes_used; + + spin_lock(&cache->space_info->lock); + spin_lock(&cache->lock); + bytes_used = cache->key.offset - + btrfs_block_group_used(&cache->item); + cache->space_info->bytes_used += bytes_used >> 1; + spin_unlock(&cache->lock); + spin_unlock(&cache->space_info->lock); + fragment_free_space(fs_info->extent_root, cache); + } +#endif mutex_unlock(&caching_ctl->mutex); wake_up(&caching_ctl->wait); @@ -9624,6 +9688,14 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, free_excluded_extents(root, cache); +#ifdef CONFIG_BTRFS_DEBUG + if (btrfs_should_fragment_free_space(root, cache)) { + u64 new_bytes_used = size - bytes_used; + + bytes_used += new_bytes_used >> 1; + fragment_free_space(root, cache); + } +#endif /* * Call to ensure the corresponding space_info object is created and * assigned to our block group, but don't update its counters just yet. |