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5.2 Fsck
5.2.3 Inode consistency
fsck checks for the allocation state, the format and type, link count, duplicate blocks (blocks already claimed by another inode), bad blocks, inode size, and block count for each of the inodes, starting with inode 2. Inode 0 is reserved to mark unused inodes, and inode 1 is reserved for a future service. If an inode has a non-zero link count, but fsck, when checking the directory entries, finds no reference for that inode, it places the file referenced by the inode in lost+found.
Unix System Administration - 8 AUG 1996
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