Hello Kinsey, On 02.02.24 23:03, Kinsey Moore wrote:
On JFFS2 file systems on NOR flash or dataflash that does not have spare area for metadata and thus does not invoke delayed writes, it is possible to put the file system into a state where all blocks have been written to and all files have been deleted from the filesystem. There is a bug in the JFFS2 file system scan routine that detects this situation as a corrupted file system since the scan routine relies on "used" space to discriminate a valid file system when there are blocks that need to be erased. The correct fix would require a partial rewrite of the scan routine, so instead this patch tracks the space marked as obsolete along with space at the end of each block that is otherwise too small to contain a JFFS2 node so that it can me compared with the dirty space. Corrupted data (or otherwise non-JFFS2 blocks) will still cause this check to fail as corrupted data isn't recognized as obsoleted (deleted) nodes.
this should be reported to the Linux JFFS2 maintainers. A test case would be also nice.
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