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e2fsck: regression tests for INCOMPAT_MMP feature Add tests for the MMP feature - creating a filesystem with mke2fs and MMP enabled, enable/disable MMP with tune2fs, disabling the e2fsck MMP flag with tune2fs after a failed e2fsck, and e2fsck checking and fixing a corrupt MMP block. The MMP tests need to be run from a real disk, not tmpfs, because tmpfs doesn't support O_DIRECT reads, which MMP uses to ensure that reads from the MMP block are not filled from the page cache. Using a local disk does not slow down the tests noticably, since they wait to detect if the MMP block is being modified. Signed-off-by: Andreas Dilger <adilger@whamcloud.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-24 22:13:27 +04:00
enable MMP using tune2fs