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DragonFlyBSD's HAMMER2 Gets Basic FSCK Support

DragonFlyBSD's now-default HAMMER2 file-system now has initial file-system checking "fsck" support.

While the Copy-on-Write file-system shouldn't technically require fsck support, basic file-system consistency checking support has been implemented anyhow. In the initial implementation, the fsck code for HAMMER2 cannot repair any damaged file-system but can only verify that the file-system is intact.

The support is implemented as fsck_hammer2.