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File Deletion on ext4

Step through unlink, bitmaps, the journal, and how SSDs break recovery

parent directorysecrets.bin→ inode #131073inode #131073mode: 0644size: 1048576links: 1dtime: 0extent:34816+256bitmapsinodeblocks1 = useddata blocks 34816+e2000000000000000000004000000000
Step 1 / 11File Exists on Disk

A file named secrets.bin lives in /mnt/data. The directory holds the filename. The inode stores metadata (size, owner, pointers to data). The data blocks hold the actual bytes. The bitmaps mark everything as allocated.

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