On Mon, Oct 21, 2013 at 05:19:40PM -0400, Jeff Mahoney wrote:
> This patchset implements the stubbed-out sysfs interface for btrfs. Or
> at least begins to do so.
>
> We publish:
> - Features supported by the file system implementation
> - Features enabled on the file system, including features unknown to
> the implemenation. These attributes can also be used to enable or
> disable features at runtime, subjecting to a safety mask.
> - Uses the attribute names to print feature names when declining to
> mount a file system.
> - The allocation data: global metadata reservation size and reserved,
> space_infos, and sums of the block groups total and used bytes.
> - Device membership via links to the block devices.
> - FS label, which is writeable.
>
> - I've also added matching ioctls for some of the functionality here so
> that btrfsprogs can use the information without jumping through hoops
> to read/parse the sysfs files. There are ioctls to query the supported
> features and to query/set features on a particular file system. There's
> also one to export the size of the global metadata reservation. I have
> a patch for btrfs-progs that uses this to print useful info in 'btrfs
> fi df' output.
>
> Ultimately, the tree structure looks like the following, under /sys/fs/btrfs.
> This is from a test file system, using two devices in raid1. You'll notice
> the 'single' and 'raid1' directories under the {data,metadata,system} dirs.
> The raid profiles are created and removed as the first/last block group
> of a certain profile is added and removed.
>
I'm not pulling in patches that add new functionality without an accompanying
xfstest so that we're not merging features without a way to test to make sure
they are working properly, this applies to the global metadata reservation ioctl
as well. Thanks,
Josef
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