your ada0s1 looks weird
note mine says freebsd-ufs not a !0
]/root/work: gpart show ada0s1
=> 0 117230904 ada0s1 BSD (56G)
0 16 - free - (8.0K)
16 113036584 1 freebsd-ufs (54G)
113036600 4194304 2 freebsd-swap (2.0G)
the filesystem looks corrupt based on your output.
I left another mistake in my post tho sorry.
tune2fs -p /dev/ada0s1a
should show the partition settings, run that first to verify shows without error.
then if all looks fine run
tune2fs -t enable /dev/ada0s1a
tune2fs -j disable /dev/ada0s1a
based on that output of gpart I would start again tho as the !0 isnt a good sign.