linux-kernel - Re: [PATCH 25/25] fsinfo: Add API documentation [ver #13]

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Date:   Wed, 5 Jun 2019 13:21:48 +0100
From:   Alan Jenkins <alan.christopher.jenkins@...il.com>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, raven@...maw.net,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mszeredi@...hat.com
Subject: Re: [PATCH 25/25] fsinfo: Add API documentation [ver #13]

On 28/05/2019 16:14, David Howells wrote:
> +Then there are attributes that convey information about the mount topology:
> +
> + *  ``FSINFO_ATTR_MOUNT_INFO``
> +
> +    This struct-type attribute conveys information about a mount topology node
> +    rather than a superblock.  This includes the ID of the superblock mounted
> +    there and the ID of the mount node, its parent, group, master and
> +    propagation source.  It also contains the attribute flags for the mount and
> +    a change notification counter so that it can be quickly determined if that
> +    node changed.
> +
> + *  ``FSINFO_ATTR_MOUNT_DEVNAME``
> +
> +    This string-type attribute returns the "device name" that was supplied when
> +    the mount object was created.
> +
> + *  ``FSINFO_ATTR_MOUNT_CHILDREN``
> +
> +    This is an array-type attribute that conveys a set of structs, each of
> +    which indicates the mount ID of a child and the change counter for that
> +    child.  The kernel also tags an extra element on the end that indicates the
> +    ID and change counter of the queried object.  This allows a conflicting
> +    change to be quickly detected by comparing the before and after counters.
> +
> + *  ``FSINFO_ATTR_MOUNT_SUBMOUNT``
> +
> +    This is a string-type attribute that conveys the pathname of the Nth
> +    mountpoint under the target mount, relative to the mount root or the
> +    chroot, whichever is closer.  These correspond on a 1:1 basis with the
> +    eleemnts in the FSINFO_ATTR_MOUNT_CHROOT list.

FSINFO_ATTR_MOUNT_CHROOT -> FSINFO_ATTR_MOUNT_CHILDREN