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    Subject[PATCH 09/10] teach shmem_get_link() to work in RCU mode
    Date
    From: Al Viro <viro@zeniv.linux.org.uk>

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    ---
    mm/shmem.c | 20 ++++++++++++++------
    1 file changed, 14 insertions(+), 6 deletions(-)

    diff --git a/mm/shmem.c b/mm/shmem.c
    index e8220cf..e1ea5b5 100644
    --- a/mm/shmem.c
    +++ b/mm/shmem.c
    @@ -2501,12 +2501,20 @@ static const char *shmem_get_link(struct dentry *dentry,
    {
    struct page *page = NULL;
    int error;
    - if (!dentry)
    - return ERR_PTR(-ECHILD);
    - error = shmem_getpage(inode, 0, &page, SGP_READ, NULL);
    - if (error)
    - return ERR_PTR(error);
    - unlock_page(page);
    + if (!dentry) {
    + page = find_get_page(inode->i_mapping, 0);
    + if (!page)
    + return ERR_PTR(-ECHILD);
    + if (!PageUptodate(page)) {
    + put_page(page);
    + return ERR_PTR(-ECHILD);
    + }
    + } else {
    + error = shmem_getpage(inode, 0, &page, SGP_READ, NULL);
    + if (error)
    + return ERR_PTR(error);
    + unlock_page(page);
    + }
    *cookie = page;
    return page_address(page);
    }
    --
    2.1.4


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