btrfs: migrate the chunk allocation code

This feels more at home in block-group.c than in extent-tree.c.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>i
[ refresh ]
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 0 insertions, 244 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 03c0210840a2..9dd8b08e4615 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2661,243 +2661,6 @@ u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info)
 	return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
 }
 
-static void force_metadata_allocation(struct btrfs_fs_info *info)
-{
-	struct list_head *head = &info->space_info;
-	struct btrfs_space_info *found;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(found, head, list) {
-		if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
-			found->force_alloc = CHUNK_ALLOC_FORCE;
-	}
-	rcu_read_unlock();
-}
-
-static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
-			      struct btrfs_space_info *sinfo, int force)
-{
-	u64 bytes_used = btrfs_space_info_used(sinfo, false);
-	u64 thresh;
-
-	if (force == CHUNK_ALLOC_FORCE)
-		return 1;
-
-	/*
-	 * in limited mode, we want to have some free space up to
-	 * about 1% of the FS size.
-	 */
-	if (force == CHUNK_ALLOC_LIMITED) {
-		thresh = btrfs_super_total_bytes(fs_info->super_copy);
-		thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1));
-
-		if (sinfo->total_bytes - bytes_used < thresh)
-			return 1;
-	}
-
-	if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8))
-		return 0;
-	return 1;
-}
-
-static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type)
-{
-	u64 num_dev;
-
-	num_dev = btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)].devs_max;
-	if (!num_dev)
-		num_dev = fs_info->fs_devices->rw_devices;
-
-	return num_dev;
-}
-
-/*
- * If @is_allocation is true, reserve space in the system space info necessary
- * for allocating a chunk, otherwise if it's false, reserve space necessary for
- * removing a chunk.
- */
-void check_system_chunk(struct btrfs_trans_handle *trans, u64 type)
-{
-	struct btrfs_fs_info *fs_info = trans->fs_info;
-	struct btrfs_space_info *info;
-	u64 left;
-	u64 thresh;
-	int ret = 0;
-	u64 num_devs;
-
-	/*
-	 * Needed because we can end up allocating a system chunk and for an
-	 * atomic and race free space reservation in the chunk block reserve.
-	 */
-	lockdep_assert_held(&fs_info->chunk_mutex);
-
-	info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
-	spin_lock(&info->lock);
-	left = info->total_bytes - btrfs_space_info_used(info, true);
-	spin_unlock(&info->lock);
-
-	num_devs = get_profile_num_devs(fs_info, type);
-
-	/* num_devs device items to update and 1 chunk item to add or remove */
-	thresh = btrfs_calc_trunc_metadata_size(fs_info, num_devs) +
-		btrfs_calc_trans_metadata_size(fs_info, 1);
-
-	if (left < thresh && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
-		btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu",
-			   left, thresh, type);
-		btrfs_dump_space_info(fs_info, info, 0, 0);
-	}
-
-	if (left < thresh) {
-		u64 flags = btrfs_system_alloc_profile(fs_info);
-
-		/*
-		 * Ignore failure to create system chunk. We might end up not
-		 * needing it, as we might not need to COW all nodes/leafs from
-		 * the paths we visit in the chunk tree (they were already COWed
-		 * or created in the current transaction for example).
-		 */
-		ret = btrfs_alloc_chunk(trans, flags);
-	}
-
-	if (!ret) {
-		ret = btrfs_block_rsv_add(fs_info->chunk_root,
-					  &fs_info->chunk_block_rsv,
-					  thresh, BTRFS_RESERVE_NO_FLUSH);
-		if (!ret)
-			trans->chunk_bytes_reserved += thresh;
-	}
-}
-
-/*
- * If force is CHUNK_ALLOC_FORCE:
- *    - return 1 if it successfully allocates a chunk,
- *    - return errors including -ENOSPC otherwise.
- * If force is NOT CHUNK_ALLOC_FORCE:
- *    - return 0 if it doesn't need to allocate a new chunk,
- *    - return 1 if it successfully allocates a chunk,
- *    - return errors including -ENOSPC otherwise.
- */
-int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
-		      enum btrfs_chunk_alloc_enum force)
-{
-	struct btrfs_fs_info *fs_info = trans->fs_info;
-	struct btrfs_space_info *space_info;
-	bool wait_for_alloc = false;
-	bool should_alloc = false;
-	int ret = 0;
-
-	/* Don't re-enter if we're already allocating a chunk */
-	if (trans->allocating_chunk)
-		return -ENOSPC;
-
-	space_info = btrfs_find_space_info(fs_info, flags);
-	ASSERT(space_info);
-
-	do {
-		spin_lock(&space_info->lock);
-		if (force < space_info->force_alloc)
-			force = space_info->force_alloc;
-		should_alloc = should_alloc_chunk(fs_info, space_info, force);
-		if (space_info->full) {
-			/* No more free physical space */
-			if (should_alloc)
-				ret = -ENOSPC;
-			else
-				ret = 0;
-			spin_unlock(&space_info->lock);
-			return ret;
-		} else if (!should_alloc) {
-			spin_unlock(&space_info->lock);
-			return 0;
-		} else if (space_info->chunk_alloc) {
-			/*
-			 * Someone is already allocating, so we need to block
-			 * until this someone is finished and then loop to
-			 * recheck if we should continue with our allocation
-			 * attempt.
-			 */
-			wait_for_alloc = true;
-			spin_unlock(&space_info->lock);
-			mutex_lock(&fs_info->chunk_mutex);
-			mutex_unlock(&fs_info->chunk_mutex);
-		} else {
-			/* Proceed with allocation */
-			space_info->chunk_alloc = 1;
-			wait_for_alloc = false;
-			spin_unlock(&space_info->lock);
-		}
-
-		cond_resched();
-	} while (wait_for_alloc);
-
-	mutex_lock(&fs_info->chunk_mutex);
-	trans->allocating_chunk = true;
-
-	/*
-	 * If we have mixed data/metadata chunks we want to make sure we keep
-	 * allocating mixed chunks instead of individual chunks.
-	 */
-	if (btrfs_mixed_space_info(space_info))
-		flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA);
-
-	/*
-	 * if we're doing a data chunk, go ahead and make sure that
-	 * we keep a reasonable number of metadata chunks allocated in the
-	 * FS as well.
-	 */
-	if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) {
-		fs_info->data_chunk_allocations++;
-		if (!(fs_info->data_chunk_allocations %
-		      fs_info->metadata_ratio))
-			force_metadata_allocation(fs_info);
-	}
-
-	/*
-	 * Check if we have enough space in SYSTEM chunk because we may need
-	 * to update devices.
-	 */
-	check_system_chunk(trans, flags);
-
-	ret = btrfs_alloc_chunk(trans, flags);
-	trans->allocating_chunk = false;
-
-	spin_lock(&space_info->lock);
-	if (ret < 0) {
-		if (ret == -ENOSPC)
-			space_info->full = 1;
-		else
-			goto out;
-	} else {
-		ret = 1;
-		space_info->max_extent_size = 0;
-	}
-
-	space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
-out:
-	space_info->chunk_alloc = 0;
-	spin_unlock(&space_info->lock);
-	mutex_unlock(&fs_info->chunk_mutex);
-	/*
-	 * When we allocate a new chunk we reserve space in the chunk block
-	 * reserve to make sure we can COW nodes/leafs in the chunk tree or
-	 * add new nodes/leafs to it if we end up needing to do it when
-	 * inserting the chunk item and updating device items as part of the
-	 * second phase of chunk allocation, performed by
-	 * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a
-	 * large number of new block groups to create in our transaction
-	 * handle's new_bgs list to avoid exhausting the chunk block reserve
-	 * in extreme cases - like having a single transaction create many new
-	 * block groups when starting to write out the free space caches of all
-	 * the block groups that were made dirty during the lifetime of the
-	 * transaction.
-	 */
-	if (trans->chunk_bytes_reserved >= (u64)SZ_2M)
-		btrfs_create_pending_block_groups(trans);
-
-	return ret;
-}
-
 static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start)
 {
 	struct btrfs_block_group_cache *cache;
@@ -5837,13 +5600,6 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
 	return ret;
 }
 
-int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type)
-{
-	u64 alloc_flags = get_alloc_profile(trans->fs_info, type);
-
-	return btrfs_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE);
-}
-
 /*
  * helper to account the unused space of all the readonly block group in the
  * space_info. takes mirrors into account.