On Mon, 2017-05-08 at 11:28 +0200, Pavel Machek wrote: > > Are you sure you have it right in JFFS2? Do you journal block erases? > Apparently, that was pretty much non-issue on older flashes.
It isn't necessary in JFFS2. It is a *purely* log-structured file system (which is why it doesn't scale well past the 1GiB or so that we made it handle for OLPC). So we don't erase a block until all its contents are obsolete. And if we fail to complete the erase... well the contents are either going to fail a CRC check, or... still be obsoleted by later entries elsewhere. And even if it *looks* like an erase has completed and the block is all 0xFF, we erase it again and write a 'clean marker' to it to indicate that the erase was completed successfully. Because otherwise it can't be trusted.
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