On 07/12/2010 11:19 AM, Jan Kara wrote:
Those mount option has the same meaning as in ext4 file system. It
provide a way to enable/disable file system's trim support. The trim
support is off by default, thus nodiscard option is not actually
necessary.
I kind of miss why ext3 should have a 'discard' mount option. When
user calls DISCARD ioctl on the filesystem, then he probably wants
discard to be performed.
Honza
Sorry I misunderstood your original question.
One reason that you might want to have a "discard" option is to allow a system
admin to mount without barriers to protect flaky hardware (we have had some
mixed results for example). As you say, the user probably wants to have the
ioctl do the discard and should be reasonable for doing it only on solid devices,
Regards,
Ric
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