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14 up file rewrites significantly. Therefore, it is useful to reduce
18 allocator. When a file is first created, the block allocator
19 speculatively allocates 8KiB of disk space to the file on the assumption
20 that the space will get written soon. When the file is closed, the
23 files) then the file data gets written out in a single multi-block
25 Under this scheme, when a file needs more blocks to absorb file writes,
33 file's data blocks in the same block group as its inode. This cuts down
34 on the seek penalty when the filesystem first has to read a file's inode
35 to learn where the file's data blocks live and then seek over to the
36 file's data blocks to begin I/O operations.
49 over a disk; as the top-level directory/file blobs fill up one block