Description of problem:
Make xfs filesystem failed with specified blocksize. works for ext file system


Version-Release number of selected component (if applicable):
libguestfs-1.22.2-1.el7.x86_64

How reproducible:
100%


Steps to Reproduce:
# guestfish -x -v -N fs:xfs mkfs-opts xfs /dev/sda1 blocksize:4096

udevadm settle
libguestfs: recv_from_daemon: received GUESTFS_LAUNCH_FLAG
libguestfs: [05851ms] appliance is up
libguestfs: trace: launch = 0
libguestfs: trace: part_disk "/dev/sda" "mbr"
guestfsd: main_loop: new request, len 0x3c
udevadm settle
parted -s -- /dev/sda mklabel msdos mkpart primary 128s -128s
Warning: The resulting partition is not properly aligned for best performance.
udevadm settle
libguestfs: trace: part_disk = 0
libguestfs: trace: mkfs "xfs" "/dev/sda1"
guestfsd: main_loop: proc 210 (part_disk) took 0.18 seconds
guestfsd: main_loop: new request, len 0x50
wipefs -a --force /dev/sda1
mkfs -t xfs -f /dev/sda1
libguestfs: trace: mkfs = 0
libguestfs: trace: mkfs "xfs" "/dev/sda1" "blocksize:4096"
guestfsd: main_loop: proc 278 (mkfs) took 0.20 seconds
guestfsd: main_loop: new request, len 0x50
wipefs -a --force /dev/sda1
mkfs -t xfs -f -b 4096 /dev/sda1
unknown option -b 4096
Usage: mkfs.xfs
/* blocksize */\t\t[-b log=n|size=num]
/* data subvol */\t[-d agcount=n,agsize=n,file,name=xxx,size=num,
\t\t\t    (sunit=value,swidth=value|su=num,sw=num),
\t\t\t    sectlog=n|sectsize=num
/* inode size */\t[-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
\t\t\t    projid32bit=0|1]
/* log subvol */\t[-l agnum=n,internal,size=num,logdev=xxx,version=n
\t\t\t    sunit=value|su=num,sectlog=n|sectsize=num,
\t\t\t    lazy-count=0|1]
/* label */\t\t[-L label (maximum 12 characters)]
/* naming */\t\t[-n log=n|size=num,version=2|ci]
/* prototype file */\t[-p fname]
/* quiet */\t\t[-q]
/* realtime subvol */\t[-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */\t[-s log=n|size=num]
/* version */\t\t[-V]
\t\t\tdevicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
      xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).
guestfsd: error: xfs: /dev/sda1: unknown option -b 4096
Usage: mkfs.xfs
/* blocksize */\t\t[-b log=n|size=num]
/* data subvol */\t[-d agcount=n,agsize=n,file,name=xxx,size=num,
\t\t\t    (sunit=value,swidth=value|su=num,sw=num),
\t\t\t    sectlog=n|sectsize=num
/* inode size */\t[-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
\t\t\t    projid32bit=0|1]
/* log subvol */\t[-l agnum=n,internal,size=num,logdev=xxx,version=n
\t\t\t    sunit=value|su=num,sectlog=n|sectsize=num,
\t\t\t    lazy-count=0|1]
/* label */\t\t[-L label (maximum 12 characters)]
/* naming */\t\t[-n log=n|size=num,version=2|ci]
/* prototype file */\t[-p fname]
/* quiet */\t\t[-q]
/* realtime subvol */\t[-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */\t[-s log=n|size=num]
/* version */\t\t[-V]
\t\t\tdevicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
      xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).
guestfsd: main_loop: proc 278 (mkfs) took 0.08 seconds
libguestfs: trace: mkfs = -1 (error)
libguestfs: error: mkfs: xfs: /dev/sda1: unknown option -b 4096
Usage: mkfs.xfs
/* blocksize */                [-b log=n|size=num]
/* data subvol */        [-d agcount=n,agsize=n,file,name=xxx,size=num,
                            (sunit=value,swidth=value|su=num,sw=num),
                            sectlog=n|sectsize=num
/* inode size */        [-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
                            projid32bit=0|1]
/* log subvol */        [-l agnum=n,internal,size=num,logdev=xxx,version=n
                            sunit=value|su=num,sectlog=n|sectsize=num,
                            lazy-count=0|1]
/* label */                [-L label (maximum 12 characters)]
/* naming */                [-n log=n|size=num,version=2|ci]
/* prototype file */        [-p fname]
/* quiet */                [-q]
/* realtime subvol */        [-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */        [-s log=n|size=num]
/* version */                [-V]
                        devicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
      xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).
libguestfs: trace: close
libguestfs: closing guestfs handle 0x7fe65954b120 (state 2)
libguestfs: trace: internal_autosync
guestfsd: main_loop: new request, len 0x28
fsync /dev/sda
guestfsd: main_loop: proc 282 (internal_autosync) took 0.00 seconds
libguestfs: trace: internal_autosync = 0
libguestfs: sending SIGTERM to process 30679
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfsuWbhmx


Actual results:
Failed due to "unknown option -b"


Expected results:
Make file system successfully


Additional info: