Kalpak Shah wrote:
Also, I am curious about this. Is there a test case for mounting the
same filesystem multiple times? Does this use different paths to reach
the device? Or is there a race? Or does it happen on a device shared by
multiple hosts?
If you are using some HA software, there is the possibility of a race.
Yes it can happen on a device shared by multiple hosts.
Ah, if the HA-software doesn't deal with multiple mounts for filesystems
it is managing, then I would claim that the software is flawed. :)
But yes, turning on MMP would help.
It might also help to make the frequency at which sequence number gets
updated (currently 5 sec) tunable. Would making that also a field in the
super block be a bad idea (set only by mkfs/tunefs)?
It might also be worthwhile to write the dev_t, the path of the device
and the hostname to the s_mmp_block, along with the random sequence. (I
assume there is enough space.) If the mount is being failed because of a
multiple mount scenario, these fields could be used to provide useful
diagnostics.
My $ 0.02. :)
Regards,
Manoj
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