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ext2fs Corruption Comments

I was browsing the recent "Kernel Traffic" site, when I saw this 
interesting note (http://kt.linuxcare.com/kt19991213_46.html#4)
about fs corruption under 2.2 Kernel series.

Apparently, the problem was due to a race condition:

"Jason and Samuel told me they could reliable reproduce fs corruption 
by writing to a filesystem while the ioctl(BLKFLSBUF) is running in 
parallel on the blockdevice where the fs is mounted. 

I understood what was going on: BLKFLSBUF is just an interface for 
invalidate_buffers and invalidate_buffers() trashes away _all_ the 
buffers beloging to such a blockdevice. _Dirty_ buffers included."

Could some of the changes in the new linux device drivers have
introduced this same race condition?  I realize that we don't use
ioctl's in the servers, but perhaps they get called in some way
through the C library when running standard Linux utilities, which
results in the rpc analog of this ioctl being invoked.  For example,
the "pokel_sync" routine of the ext2fs server seems like a possible
candidate.

I'm attaching the final "successful" patch for your review, in the
hope that it will be helpful.

Thanks,

-Brent


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end
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