A data structure using a bit per allocation unit to mark whether it is available. Its agreement with ownership references is a file-system crash consistency requirement; changing just this structure does not install the owner's update.
A file-system allocation bitmap for storage blocks. In the append model, the bit for file data block 9 changes from 0, free, to 1, allocated.
A file-system allocation bitmap for inodes. Appending to an existing file does not allocate an inode; creating the toy file does.

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