My ext2/3/4 filesystem has gone read-only, what now?

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When the kernel believes the integrity of the filesystem has been threatened it will cut off all of the inbound I/O from the storage to the filesystem level by placing the filesystem in a read-only state. This is a safety tactic used by the kernel to prevent any possible corruption sources from further corrupting data to help safeguard against additional data loss.

The integrity of the ...

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