From: Mark Tinguely <tinguely@sgi.com>
To: Jeff Liu <jeff.liu@oracle.com>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: [PATCH v3 2/2] xfs: Don't keep silent if sunit/swidth can not be changed via mount
Date: Thu, 02 May 2013 10:28:36 -0500 [thread overview]
Message-ID: <51828624.2050001@sgi.com> (raw)
In-Reply-To: <51824DB9.6090401@oracle.com>
On 05/02/13 06:27, Jeff Liu wrote:
> From: Jie Liu<jeff.liu@oracle.com>
>
> As per the mount man page, sunit and swidth can be changed via
> mount options. For XFS, on the face of it, those options seems
> works if the specified alignments is properly, e.g.
> # mount -o sunit=4096,swidth=8192 /dev/sdb1 /mnt
> # mount | grep sdb1
> /dev/sdb1 on /mnt type xfs (rw,sunit=4096,swidth=8192)
>
> However, neither sunit nor swidth is shown from the xfs_info output.
> # xfs_info /mnt
> meta-data=/dev/sdb1 isize=256 agcount=4, agsize=262144 blks
> = sectsz=512 attr=2
> data = bsize=4096 blocks=1048576, imaxpct=25
> = sunit=0 swidth=0 blks
> ^^^^^^^^^^^^^^^^^^^^^^^^^^
> naming =version 2 bsize=4096 ascii-ci=0
> log =internal bsize=4096 blocks=2560, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
>
> The reason is that the alignment can only be changed if the relevant
> super block is already configured with alignments, otherwise, the
> given value is silently ignored.
>
> With this fix, the attempt to mount a storage without strip alignment
> setup on a super block will get an error with a warning in syslog to
> indicate the true cause, e.g.
> # mount -o sunit=4096,swidth=8192 /dev/sdb1 /mnt
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
> missing codepage or helper program, or other error
> In some cases useful info is found in syslog - try
> dmesg | tail or so
> .......
> XFS (sdb1): cannot change alignment: superblock does not support data
> alignment
>
> Signed-off-by: Jie Liu<jeff.liu@oracle.com>
Looks good.
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
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next prev parent reply other threads:[~2013-05-02 15:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-02 11:27 [PATCH v3 2/2] xfs: Don't keep silent if sunit/swidth can not be changed via mount Jeff Liu
2013-05-02 15:28 ` Mark Tinguely [this message]
2013-06-17 22:49 ` Ben Myers
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