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in that it only journals parts of the inode.

B+ tree

JFS uses a B+ tree to accelerate lookups in directories. JFS can store 8 entries of a directory in the directory's inode before moving the entries to a B+ tree. JFS also indexes extents in a B+ tree.

Dynamic inode allocation

JFS dynamically allocates space for disk inodes as necessary. Each inode is 512 bytes. 32 inodes are allocated

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