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List:       linux-xfs
Subject:    Re: Why problems with mount and strace
From:       Eric Sandeen <sandeen () sgi ! com>
Date:       2004-04-26 17:13:25
Message-ID: 1082999605.9623.54.camel () stout ! americas ! sgi ! com
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I came across this again, and I have an answer for you... at least
relating to today's code.

xfs mount tries to start linvfs_xfs_syncd, which invokes a
kernel_thread(), which contains this code:


         /* lock out any potential ptracer */
         task_lock(task);
         if (task->ptrace) {
                 task_unlock(task);
                 return -EPERM;
         }

for security reasons... in short, when stracing, linvfs_xfs_syncd() fails, 
and hence the mount fails.

-Eric


On Wed, 2003-09-24 at 05:06, Blizbor (IMA) wrote:
> Hi,
> 
> I have tested something and I have found weird behaviour.
> 
> I repeated the same for fstype in ext2, jfs, reiserfs and xfs curious 
> how mkfs and mount
> are working (trying to trace whats wrong beetween drbd and xfs)
> 
> strace -o mkfs.${fstype}.txt -ff mkfs.${fstype} /dev/xxx
> strace -o mount.${fstype} /dev/xxx /mountpoint
> 
> I've got all mkfs logs.
> I've got all but xfs logs for mount.
> 
> Telling the trueth, I've got log of mounting xfs but something weird 
> happened.
> Mount without strace was working fine but "strace mount" was failed.
> (No such device, bad options ... easy to reproduce)
> Why I can't mount xfs and strace it ?
> 
> Regards,
> Blizbor
-- 
Eric Sandeen      [C]XFS for Linux   http://oss.sgi.com/projects/xfs
sandeen@sgi.com   SGI, Inc.          651-683-3102


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