Re: [PATCH v3] fs: Invalidate the cache for a parent block-device iffsync() is called for a partition

[Christoph Hellwig]

On Thu, Jan 26, 2012 at 01:40:51PM -0800, Andrew Morton wrote:
> The Right Thing To Do here is to make the kernel behave logically and
> predictably, then modify the userspace tools.  But if we're modifying
> the userspace tools then we would just change userspace to issue a
> BLKFLSBUF to /dev/sda and leave the kernel alone.

The right fix is to make partition and whole disk access coherent,
which is fairly simply:

 - create the block device inode/mapping per gendisk, and only reference
   count it per block_device
 - make sure blkdev_get_block(s) applies the correct offset if used on
   partitions

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/