Kernel/Ext2FS: Allocate blocks lazily + support writing holes #24149
+346
−461
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... and also do a thorough refactor to be able to accomplish that, because the old implementation was extremely dependent on all blocks being sequential. There's a fairly long explanation of that in the relevant commit message.
This also accidentally fixes various situations where the filesystem would get slightly corrupted, such as when running the second of the following two commands:
Here's a more complete script that I used to test the correctness of this PR:
Closes #6236.