MFC r350421:
Avoid relying on header pollution from sys/refcount.h.

MFC r349800,r349801:

Fix misc fs fuzzing issues.

Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-22-EXT2-9: Denial of service in ftr

MFC r349800,r349801:

Fix misc fs fuzzing issues.

Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-22-EXT2-9: Denial of service in ftruncate-0 (ext2_balloc)
FS-11-EXT2-6: Denial Of Service in write-1 (ext2_balloc)

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MFC r349802 (from fsu@):

Add additional check for 'blocks per group' and 'fragments per group'
superblock fields.

These fields will not be equal only in case if bigalloc filesystem feature is
turne

MFC r349802 (from fsu@):

Add additional check for 'blocks per group' and 'fragments per group'
superblock fields.

These fields will not be equal only in case if bigalloc filesystem feature is
turned on. This feature is not supported for now.

Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-27-EXT2-12: Denial of Service in openat-0 (vm_fault_hold/ext2_clusteracct)

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MFC r348251:

Remove "struct ucred*" argument from vtruncbuf

vtruncbuf takes a "struct ucred*" argument. AFAICT, it's been unused ever
since that function was first added in r34611. Remove it. Also

MFC r348251:

Remove "struct ucred*" argument from vtruncbuf

vtruncbuf takes a "struct ucred*" argument. AFAICT, it's been unused ever
since that function was first added in r34611. Remove it. Also, remove some
"struct ucred" arguments from fuse and nfs functions that were only used by
vtruncbuf.

Reviewed by: cem
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20377

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