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Fix test 096 when used with realtime subvols.
Merge of master-melb:xfs-cmds:26346a by kenmcd.

QA output created by 096

# su too big but must be a multiple of fs block size too
--- mkfs=-l version=2,su=262656 ---
log stripe unit (262656) must be a multiple of the block size (4096)


# test log stripe greater than LR size
--- mkfs=-l version=2,su=266240 ---
log stripe unit (266240 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=DEV isize=256    agcount=N, agsize=N blks
data     =                       bsize=4096   blocks=N, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096
log      =LOG                    bsize=4096   blocks=N, version=2
         =                       sunit=8 blks
realtime =none                   extsz=65536  blocks=N, rtextents=N


# same test but get log stripe from data stripe
--- mkfs=-l version=2 -d su=266240,sw=1 ---
log stripe unit (266240 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=DEV isize=256    agcount=N, agsize=N blks
data     =                       bsize=4096   blocks=N, imaxpct=25
         =                       sunit=65     swidth=65 blks, unwritten=1
naming   =version 2              bsize=4096
log      =LOG                    bsize=4096   blocks=N, version=2
         =                       sunit=8 blks
realtime =none                   extsz=65536  blocks=N, rtextents=N


# test out data stripe
--- mkfs=-d su=266240,sw=1 ---
meta-data=DEV isize=256    agcount=N, agsize=N blks
data     =                       bsize=4096   blocks=N, imaxpct=25
         =                       sunit=65     swidth=65 blks, unwritten=1
naming   =version 2              bsize=4096
log      =LOG                    bsize=4096   blocks=N, version=1
         =                       sunit=0 blks
realtime =none                   extsz=65536  blocks=N, rtextents=N


# test out data stripe the same but using sunit & swidth
--- mkfs=-d sunit=520,swidth=520 ---
meta-data=DEV isize=256    agcount=N, agsize=N blks
data     =                       bsize=4096   blocks=N, imaxpct=25
         =                       sunit=65     swidth=65 blks, unwritten=1
naming   =version 2              bsize=4096
log      =LOG                    bsize=4096   blocks=N, version=1
         =                       sunit=0 blks
realtime =none                   extsz=65536  blocks=N, rtextents=N