Re: vfs: Add MS_FLUSHONFSYNC mount flag

[Jeff Garzik]

Jeff Garzik wrote:
> Correctness should come before performance.  Linux has not had 
> credibility here, in the ATA+ext[23] space at least, and it is 
> embarrassing.


To be more clear / precise, this means actually performing the 
guarantees we claim to the user.  For example,

fsync(2) on ext2 should trigger a storage device writeback cache flush 
[or equivalent guarantee via FUA].

fsync(2) or journal commit on ext3 should trigger a flush [or equivalent 
guarantee via FUA].

Though, certainly, the user should be able to disable this strict 
behavior and trade correctness for performance.

	Jeff




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