Re: vfs: Add MS_FLUSHONFSYNC mount flag

[Eric Sandeen]

Jan Kara wrote:
> On Thu 12-02-09 11:13:37, Eric Sandeen wrote:

...

>> Also that way if you have 8 partitions on a battery-backed blockdev, you
>> can tune it once, instead of needing to mount all 8 filesystems with the
>> new option.
>   Yes, but OTOH we should give sysadmin a possibility to enable / disable
> it on just some partitions. I don't see a reasonable use for that but people
> tend to do strange things ;) and here isn't probably a strong reason to not
> allow them.
> 
> 								Honza

But nobody has asked for that, have they?  So why offer it up a this point?

They could use LD_PRELOAD to make fsync a no-op if they really don't
care for it, I guess... though that's not easily per-fs either.

But do we really want to go out of our way to enable people to
short-circuit data integrity paths and then file bugs when their files
go missing? :)

(I guess the blockdev tunable is similarly dangerous, but it more
clearly meets the explicit need (writecache-safe devices))

-Eric
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