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    Subject[PATCH 29/45] NFS: Add comment banners to some NFS functions [ver #35]
    Date
    Add comment banners to some NFS functions so that they can be modified by the
    NFS fscache patches for further information.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    fs/nfs/file.c | 26 ++++++++++++++++++++++++++
    1 files changed, 26 insertions(+), 0 deletions(-)


    diff --git a/fs/nfs/file.c b/fs/nfs/file.c
    index ef57a5a..26a073b 100644
    --- a/fs/nfs/file.c
    +++ b/fs/nfs/file.c
    @@ -354,6 +354,13 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
    return copied;
    }

    +/*
    + * Partially or wholly invalidate a page
    + * - Release the private state associated with a page if undergoing complete
    + * page invalidation
    + * - Called if either PG_private or PG_private_2 is set on the page
    + * - Caller holds page lock
    + */
    static void nfs_invalidate_page(struct page *page, unsigned long offset)
    {
    if (offset != 0)
    @@ -362,12 +369,26 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset)
    nfs_wb_page_cancel(page->mapping->host, page);
    }

    +/*
    + * Attempt to release the private state associated with a page
    + * - Called if either PG_private or PG_private_2 is set on the page
    + * - Caller holds page lock
    + * - Return true (may release page) or false (may not)
    + */
    static int nfs_release_page(struct page *page, gfp_t gfp)
    {
    /* If PagePrivate() is set, then the page is not freeable */
    return 0;
    }

    +/*
    + * Attempt to clear the private state associated with a page when an error
    + * occurs that requires the cached contents of an inode to be written back or
    + * destroyed
    + * - Called if either PG_private or PG_private_2 is set on the page
    + * - Caller holds page lock
    + * - Return 0 if successful, -error otherwise
    + */
    static int nfs_launder_page(struct page *page)
    {
    return nfs_wb_page(page->mapping->host, page);
    @@ -389,6 +410,11 @@ const struct address_space_operations nfs_file_aops = {
    .launder_page = nfs_launder_page,
    };

    +/*
    + * Notification that a PTE pointing to an NFS page is about to be made
    + * writable, implying that someone is about to modify the page through a
    + * shared-writable mapping
    + */
    static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
    {
    struct file *filp = vma->vm_file;


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