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    SubjectRe: [PATCH 21/48] writeback: make backing_dev_info host cgroup-specific bdi_writebacks
    On Mon, Mar 23, 2015 at 12:54:32AM -0400, Tejun Heo wrote:

    [..]
    > +/**
    > + * inode_attach_wb - associate an inode with its wb
    > + * @inode: inode of interest
    > + * @page: page being dirtied (may be NULL)
    > + *
    > + * If @inode doesn't have its wb, associate it with the wb matching the
    > + * memcg of @page or, if @page is NULL, %current. May be called w/ or w/o
    > + * @inode->i_lock.
    > + */
    > +static inline void inode_attach_wb(struct inode *inode, struct page *page)
    > +{
    > + if (!inode->i_wb)
    > + __inode_attach_wb(inode, page);
    > +}

    Hi Tejun,

    I was curious to know that why do we need this "struct page *page" when
    trying to attach a inode to a bdi_writeback. Is using current's cgroup
    always not sufficient?

    Thanks
    Vivek


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