Re: mkfs.xfs cannot make sector size 64 KiB?

[Justin Piszcz <jpiszcz@lucidpixels.com>]

Adding LKML to cc list.

On Sun, 29 Apr 2007, Justin Piszcz wrote:

>> From the manpage:
>
>       -b     Block size options.
>
>              This option specifies the fundamental block size of the 
> filesys-
>              tem.   The  valid suboptions are: log=value and size=value; 
> only
>              one can be supplied.  The block size is specified  either  as 
> a
>              base two logarithm value with log=, or in bytes with size=. 
> The
>              default value is 4096 bytes (4 KiB), the minimum is 512, and 
> the
>              maximum is 65536 (64 KiB).  XFS on Linux currently only 
> supports
>              pagesize or smaller blocks.
>
> The maximum size is 64 KiB, yet it seems only up to 32 KiB is valid?
>
> I am running x86_64.
>
> $ uname -m
> x86_64
>
>
> p34:~# mkfs.xfs -b size=512 /dev/md3
> mkfs.xfs: /dev/md3 appears to contain an existing filesystem (xfs).
> mkfs.xfs: Use the -f option to force overwrite.
> p34:~# mkfs.xfs -b size=4096 /dev/md3
> mkfs.xfs: /dev/md3 appears to contain an existing filesystem (xfs).
> mkfs.xfs: Use the -f option to force overwrite.
> p34:~# mkfs.xfs -b size=8192 /dev/md3
> mkfs.xfs: /dev/md3 appears to contain an existing filesystem (xfs).
> mkfs.xfs: Use the -f option to force overwrite.
> p34:~# mkfs.xfs -b size=16384 /dev/md3
> mkfs.xfs: /dev/md3 appears to contain an existing filesystem (xfs).
> mkfs.xfs: Use the -f option to force overwrite.
> p34:~# mkfs.xfs -b size=32768 /dev/md3
> mkfs.xfs: /dev/md3 appears to contain an existing filesystem (xfs).
> mkfs.xfs: Use the -f option to force overwrite.
> p34:~# mkfs.xfs -b size=65536 /dev/md3
> illegal sector size 65536
> 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,unwritten=0|1]
> /* inode size */        [-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2]
> /* log subvol */        [-l agnum=n,internal,size=num,logdev=xxx,version=n
>                            sunit=value|su=num,sectlog=n|sectsize=num]
> /* label */             [-L label (maximum 12 characters)]
> /* naming */            [-n log=n|size=num,version=n]
> /* 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).
> p34:~#
>
> Unless, the page size is not <= 64 for x86_64?
>
> Justin.
>
>