On Thu, Apr 26, 2018 at 12:10 PM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:
> Add an ovl_inode flag OVL_CONST_INO. This flag signifies if inode number
> will remain constant over copy up or not. This flag does not get updated
> over copy up and remains unmodifed after setting once.
>
> Next patch in the series will make use of this flag. It will basically
> figure out if dentry is of type ORIGIN or not. And this can be derived
> by this flag.
>
> ORIGIN = (upperdentry && ovl_test_flag(OVL_CONST_INO, inode)).
>
> Suggested-by: Amir Goldstein <amir73il@xxxxxxxxx>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> ---
> fs/overlayfs/inode.c | 3 +++
> fs/overlayfs/overlayfs.h | 2 ++
> 2 files changed, 5 insertions(+)
>
> diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
> index a6cd57741a1f..19e96d4717bd 100644
> --- a/fs/overlayfs/inode.c
> +++ b/fs/overlayfs/inode.c
> @@ -881,6 +881,9 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
>
> OVL_I(inode)->redirect = redirect;
>
> + if (bylower)
> + ovl_set_flag(OVL_CONST_INO, inode);
> +
> /* Check for non-merge dir that may have whiteouts */
> if (is_dir) {
> if (((upperdentry && lowerdentry) || numlower > 1) ||
> diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
> index e24af484967f..e2c6a2f5addf 100644
> --- a/fs/overlayfs/overlayfs.h
> +++ b/fs/overlayfs/overlayfs.h
> @@ -38,6 +38,8 @@ enum ovl_inode_flag {
> OVL_WHITEOUTS,
> OVL_INDEX,
> OVL_UPPERDATA,
> + /* Inode number will remain constant over copy up. */
> + OVL_CONST_INO,
> };
>
> enum ovl_entry_flag {
> --
> 2.13.6
>
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