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Re: When is a block free?



Chris Worley wrote:
Where in the ext2/3 code does it know that a block on the disk is now free to reuse?

Thanks,

Chris
Hi Chris,

File systems track which blocks are free from the file system creation time (mkfs), creation of new files and deletion. Ext2/3 is the gatekeeper for all deletions, so it knows when file system blocks transition from the used state to the free state. Ext file system use bitmaps to track the blocks that are allocated or not.

Regards,

Ric


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