Warning: not enough zones for backing requested rt size due to
over-provisioning needs, writable size will be less than 524301b
meta-data=/dev/loop0             isize=512    agcount=4, agsize=32768 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=1
         =                       reflink=0    bigtime=1 inobtcount=1 nrext64=1
         =                       exchange=1   metadir=1
data     =                       bsize=4096   blocks=131072, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
log      =internal log           bsize=4096   blocks=16384, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =internal               extsz=4096   blocks=655360, rtextents=655360
         =                       rgcount=10   rgsize=65536 extents
         =                       zoned=1      start=131072 reserved=65523
Discarding blocks...Done.
meta-data=/dev/loop0             isize=512    agcount=4, agsize=32768 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=1
         =                       reflink=0    bigtime=1 inobtcount=1 nrext64=1
         =                       exchange=1   metadir=1
data     =                       bsize=4096   blocks=131072, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
log      =internal log           bsize=4096   blocks=16384, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =internal               extsz=4096   blocks=393229, rtextents=393229
         =                       rgcount=7    rgsize=65536 extents
         =                       zoned=1      start=131072 reserved=0
Discarding blocks...Done.
umount: /mnt/test/653.mnt: not mounted.
umount: /dev/sdb: not mounted.