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Re: I think mkfs.xfs and the kernel code are not constant <-- wrong

To: William L Jones <jones@xxxxxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
Subject: Re: I think mkfs.xfs and the kernel code are not constant <-- wrong
From: "William L. Jones" <jones@xxxxxxxxxxxxxxxxxx>
Date: Fri, 25 Aug 2000 10:00:48 -0500
In-reply-to: <200008250435.XAA08893@spica.cc.utexas.edu>
Sender: owner-linux-xfs@xxxxxxxxxxx
Never mid.  It was late and I was getting shift mixed up with counts.  Sigh


At 11:35 PM 8/24/00 -0500, William L Jones wrote:

I created a file system with mkfs.xfs heres the output:

meta-data=/dev/vg/xfs            isize=256    agcount=8, agsize=5120 blks
data     =                       bsize=4096   blocks=40959, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=0
naming   =version 2              bsize=4096
log      =internal log           bsize=4096   blocks=1200
realtime =none                   extsz=65536  blocks=0, rtextents=0


mkfs.xfs reports agcount of 8 with 5120 blks in an ag. df reports that that I have 159036 indoes. This implies that the ag size is 163776*256/8 bytes are 1280 4096 byte blocks per ag ,round up, which is not 5120 blks its 1/4 of this value. Which implies that mkfs.xfs is using 1024 byes per block when computing ag sizes in block.

I dug a little deeper and printed sbp->sb_inopblog in xfs_mount.c
using printk.  It value of is 4 which would be correct if a block
size was 1024, 1024/256 == 4.  This is set by mkfs.xfs


I filled up the file system and I know it filled up the ag's with 81855 inodes which is slitly less then the 81920 inodes that I would expect if an ag was 5120 4096 byte bocks in size. The kernel is is using 4096 for the size of a ag block which is not the 1024 that mkfs.xfs uses.

The kernel and mkfs.xfs need to agree on the size of block.

Bill Jones








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