btrfs: introduce key type for persistent temporary items

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The number of distinct key types is not that big that we could waste one
for something new we want to store in the tree. We'll introduce a new
name for an existing key value and use the objectid for further
extension.  The victim is the BTRFS_BALANCE_ITEM_KEY (248).

The nature of the balance status item is a good example of the temporary
item. It exists from beginning of the balance, keeps the status until it
finishes.

Signed-off-by: David Sterba <dsterba@suse.com>

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David Sterba 2016-01-25 17:32:11 +01:00

parent 388f7b1d6e

commit 0bbbccb17f

1 changed files with 16 additions and 0 deletions

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fs/btrfs/ctree.h

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