DragonFlyBSD/src bf95f21sys/vfs/msdosfs msdosfs_vnops.c msdosfs_denode.c

sys/vfs/msdosfs: Allow deupdat() against non root directory

bits from freebsd/freebsd at c7af094e18c4e4ca2a26a88c488a803472d330ee

Given ondisk layout of root directory in FAT12/16 and FAT32,
don't allow deupdat() or setattr() against root directory,
but allow against other directories.
DeltaFile
+12-0sys/vfs/msdosfs/msdosfs_vnops.c
+2-2sys/vfs/msdosfs/msdosfs_denode.c
+14-22 files

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