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SubjectRe: [PATCH v11 16/21] vfs,ext2: Remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX
On Thu, Oct 16, 2014 at 02:26:18PM +0200, Mathieu Desnoyers wrote:
> > + bool "Direct Access support"
> > + depends on MMU
> > + help
> > + Direct Access (DAX) can be used on memory-backed block devices.
> > + If the block device supports DAX and the filesystem supports DAX,
> > + then you can avoid using the pagecache to buffer I/Os. Turning
> > + on this option will compile in support for DAX; you will need to
> > + mount the filesystem using the -o xip option.
>
> There is a mismatch between the documentation file (earlier patch): -o
> dax, and this config description: -o xip.

Whoops! Good catch.

> I guess we might want to switch the mount option to "-o dax" and
> document it as such, and since it should be usable transparently for the
> same use-cases "-o xip" was enabling, we might want to keep parsing of
> "-o xip" in the code for backward compatibility.
>
> Thoughts ?

That's exactly what we do for ext2. For ext4, we force people to use
the new -o dax option. We stop documenting that -o xip exist, and we
print a message to tell people to switch over to -o dax.



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