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    SubjectRe: [PATCH -V14 03/11] vfs: Add open by file handle support
    On Tue, Jun 15, 2010 at 10:42:53PM +0530, Aneesh Kumar K.V wrote:
    > diff --git a/fs/open.c b/fs/open.c
    > index 43ac798..1c5daa3 100644
    > --- a/fs/open.c
    > +++ b/fs/open.c
    > @@ -1168,3 +1168,201 @@ SYSCALL_DEFINE4(name_to_handle_at, int, dfd, const char __user *, name,
    > return -ENOSYS;
    > }
    > #endif
    > +
    > +#ifdef CONFIG_EXPORTFS
    > +static struct vfsmount *get_vfsmount_from_fd(int fd)
    > +{
    > + int fput_needed;
    > + struct path *path;
    > + struct file *filep;
    > +
    > + if (fd == AT_FDCWD) {
    > + struct fs_struct *fs = current->fs;
    > + read_lock(&fs->lock);
    > + path = &fs->pwd;
    > + mntget(path->mnt);
    > + read_unlock(&fs->lock);
    > + } else {
    > + filep = fget_light(fd, &fput_needed);
    > + if (!filep)
    > + return ERR_PTR(-EBADF);
    > + path = &filep->f_path;
    > + mntget(path->mnt);
    > + fput_light(filep, fput_needed);
    > + }
    > + return path->mnt;
    > +}

    The bulk of this this should probably be in fs/namei.c, factored with
    path_init stuff if possible please.



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