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    Subject[PATCH 38/38] union-mount: Implement union-aware lsetxattr()
    Date
    ---
    fs/xattr.c | 31 +++++++++++++++++++++++++------
    1 files changed, 25 insertions(+), 6 deletions(-)

    diff --git a/fs/xattr.c b/fs/xattr.c
    index 66bb5c7..4e2b5f6 100644
    --- a/fs/xattr.c
    +++ b/fs/xattr.c
    @@ -320,17 +320,36 @@ SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname,
    size_t, size, int, flags)
    {
    struct path path;
    + struct nameidata nd;
    + struct vfsmount *mnt;
    + char *tmp;
    int error;

    - error = user_lpath(pathname, &path);
    + error = user_path_nd(AT_FDCWD, pathname, 0, &nd, &path, &tmp);
    if (error)
    return error;
    - error = mnt_want_write(path.mnt);
    - if (!error) {
    - error = setxattr(path.dentry, name, value, size, flags);
    - mnt_drop_write(path.mnt);
    - }
    +
    + if (IS_DIR_UNIONED(nd.path.dentry))
    + mnt = nd.path.mnt;
    + else
    + mnt = path.mnt;
    +
    + error = mnt_want_write(mnt);
    + if (error)
    + goto out;
    +
    + error = union_copyup(&nd, &path);
    + if (error)
    + goto out_drop_write;
    +
    + error = setxattr(path.dentry, name, value, size, flags);
    +
    +out_drop_write:
    + mnt_drop_write(mnt);
    +out:
    path_put(&path);
    + path_put(&nd.path);
    + putname(tmp);
    return error;
    }

    --
    1.6.3.3


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