Blank sw mapped to -1 (must be an error value returned from some
string parsing function)
So it ends up 4294967264 if su is 128k, as that's equal to (unsigned
long)(-1 * su/bsize)
If you're mounting with swalloc, you'll quickly wind up with no free
space! Ouch!
# mkfs.xfs -V
mkfs.xfs version 3.1.4
# mkfs.xfs -dfile=1,name=hi,size=$((1024*1024*100)) -bsize=4k -d
su=128k,sw= -l version=2 -i size=2k -l lazy-count=1
meta-data=hi isize=2048 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=32 swidth=4294967264 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=1248, version=2
= sectsz=512 sunit=32 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
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