Commit 24502ebb authored by Chris Mason's avatar Chris Mason
Browse files

Merge branch 'kdave-part1-enospc' into for-linus-4.8

parents a99cde43 8ca17f0f

fs/btrfs/ctree.h

+13 −2
Original line number Diff line number Diff line
@@ -439,6 +439,8 @@ struct btrfs_space_info { 
	struct list_head list;

	/* Protected by the spinlock 'lock'. */

	struct list_head ro_bgs;

	struct list_head priority_tickets;

	struct list_head tickets;



	struct rw_semaphore groups_sem;

	/* for block groups in our same type */
@@ -2624,6 +2626,15 @@ enum btrfs_reserve_flush_enum { 
	BTRFS_RESERVE_FLUSH_ALL,

};



enum btrfs_flush_state {

	FLUSH_DELAYED_ITEMS_NR	=	1,

	FLUSH_DELAYED_ITEMS	=	2,

	FLUSH_DELALLOC		=	3,

	FLUSH_DELALLOC_WAIT	=	4,

	ALLOC_CHUNK		=	5,

	COMMIT_TRANS		=	6,

};



int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);

int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);

void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
@@ -2661,8 +2672,8 @@ int btrfs_block_rsv_refill(struct btrfs_root *root, 
			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,

			   enum btrfs_reserve_flush_enum flush);

int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,

			    struct btrfs_block_rsv *dst_rsv,

			    u64 num_bytes);

			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,

			    int update_size);

int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,

			     struct btrfs_block_rsv *dest, u64 num_bytes,

			     int min_factor);

fs/btrfs/delayed-inode.c

+25 −43
Original line number Diff line number Diff line
@@ -553,7 +553,7 @@ static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans, 
	dst_rsv = &root->fs_info->delayed_block_rsv;



	num_bytes = btrfs_calc_trans_metadata_size(root, 1);

	ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);

	ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);

	if (!ret) {

		trace_btrfs_space_reservation(root->fs_info, "delayed_item",

					      item->key.objectid,
@@ -597,6 +597,29 @@ static int btrfs_delayed_inode_reserve_metadata( 


	num_bytes = btrfs_calc_trans_metadata_size(root, 1);



	/*

	 * If our block_rsv is the delalloc block reserve then check and see if

	 * we have our extra reservation for updating the inode.  If not fall

	 * through and try to reserve space quickly.

	 *

	 * We used to try and steal from the delalloc block rsv or the global

	 * reserve, but we'd steal a full reservation, which isn't kind.  We are

	 * here through delalloc which means we've likely just cowed down close

	 * to the leaf that contains the inode, so we would steal less just

	 * doing the fallback inode update, so if we do end up having to steal

	 * from the global block rsv we hopefully only steal one or two blocks

	 * worth which is less likely to hurt us.

	 */

	if (src_rsv && src_rsv->type == BTRFS_BLOCK_RSV_DELALLOC) {

		spin_lock(&BTRFS_I(inode)->lock);

		if (test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED,

				       &BTRFS_I(inode)->runtime_flags))

			release = true;

		else

			src_rsv = NULL;

		spin_unlock(&BTRFS_I(inode)->lock);

	}



	/*

	 * btrfs_dirty_inode will update the inode under btrfs_join_transaction

	 * which doesn't reserve space for speed.  This is a problem since we
@@ -626,51 +649,10 @@ static int btrfs_delayed_inode_reserve_metadata( 
						      num_bytes, 1);

		}

		return ret;

	} else if (src_rsv->type == BTRFS_BLOCK_RSV_DELALLOC) {

		spin_lock(&BTRFS_I(inode)->lock);

		if (test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED,

				       &BTRFS_I(inode)->runtime_flags)) {

			spin_unlock(&BTRFS_I(inode)->lock);

			release = true;

			goto migrate;

	}

		spin_unlock(&BTRFS_I(inode)->lock);



		/* Ok we didn't have space pre-reserved.  This shouldn't happen

		 * too often but it can happen if we do delalloc to an existing

		 * inode which gets dirtied because of the time update, and then

		 * isn't touched again until after the transaction commits and

		 * then we try to write out the data.  First try to be nice and

		 * reserve something strictly for us.  If not be a pain and try

		 * to steal from the delalloc block rsv.

		 */

		ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,

					  BTRFS_RESERVE_NO_FLUSH);

		if (!ret)

			goto out;

	ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);



		ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);

		if (!ret)

			goto out;



		if (btrfs_test_opt(root, ENOSPC_DEBUG)) {

			btrfs_debug(root->fs_info,

				    "block rsv migrate returned %d", ret);

			WARN_ON(1);

		}

		/*

		 * Ok this is a problem, let's just steal from the global rsv

		 * since this really shouldn't happen that often.

		 */

		ret = btrfs_block_rsv_migrate(&root->fs_info->global_block_rsv,

					      dst_rsv, num_bytes);

		goto out;

	}



migrate:

	ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);



out:

	/*

	 * Migrate only takes a reservation, it doesn't touch the size of the

	 * block_rsv.  This is to simplify people who don't normally have things

fs/btrfs/extent-tree.c

+464 −262

File changed.

Preview size limit exceeded, changes collapsed.

fs/btrfs/file.c

+2 −2
Original line number Diff line number Diff line
@@ -2479,7 +2479,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) 
	}



	ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv,

				      min_size);

				      min_size, 0);

	BUG_ON(ret);

	trans->block_rsv = rsv;
@@ -2522,7 +2522,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) 
		}



		ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv,

					      rsv, min_size);

					      rsv, min_size, 0);

		BUG_ON(ret);	/* shouldn't happen */

		trans->block_rsv = rsv;

fs/btrfs/inode.c

+3 −4
Original line number Diff line number Diff line
@@ -5264,7 +5264,7 @@ void btrfs_evict_inode(struct inode *inode) 
		if (steal_from_global) {

			if (!btrfs_check_space_for_delayed_refs(trans, root))

				ret = btrfs_block_rsv_migrate(global_rsv, rsv,

							      min_size);

							      min_size, 0);

			else

				ret = -ENOSPC;

		}
@@ -9116,7 +9116,7 @@ static int btrfs_truncate(struct inode *inode) 


	/* Migrate the slack space for the truncate to our reserve */

	ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv,

				      min_size);

				      min_size, 0);

	BUG_ON(ret);



	/*
@@ -9156,7 +9156,7 @@ static int btrfs_truncate(struct inode *inode) 
		}



		ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv,

					      rsv, min_size);

					      rsv, min_size, 0);

		BUG_ON(ret);	/* shouldn't happen */

		trans->block_rsv = rsv;

	}
@@ -9177,7 +9177,6 @@ static int btrfs_truncate(struct inode *inode) 
		ret = btrfs_end_transaction(trans, root);

		btrfs_btree_balance_dirty(root);

	}



out:

	btrfs_free_block_rsv(root, rsv);