static int do_handle_to_path(int mountdirfd, struct file_handle *handle,
struct path *path)
{
int retval = 0;
int handle_dwords;
path->mnt = get_vfsmount_from_fd(mountdirfd);
if (IS_ERR(path->mnt)) {
retval = PTR_ERR(path->mnt);
goto out_err;
}
/* change the handle size to multiple of sizeof(u32) */
handle_dwords = handle->handle_bytes >> 2;
path->dentry = exportfs_decode_fh(path->mnt,
(struct fid *)handle->f_handle,
handle_dwords, handle->handle_type,
vfs_dentry_acceptable, NULL);
if (IS_ERR(path->dentry)) {
retval = PTR_ERR(path->dentry);
goto out_mnt;
}
return 0;
out_mnt:
mntput(path->mnt);
out_err:
return retval;
}
static struct dentry *handle_to_dentry(int mountdirfd,
struct file_handle *handle, struct vfsmount **mntp)
{
int retval;
int handle_size;
struct vfsmount *mnt;
struct dentry *dentry;
struct handle_svc_export svc;
const struct export_operations *exop;
mnt = get_vfsmount_from_fd(mountdirfd);
if(IS_ERR(mnt))
{
retval = PTR_ERR(mnt);
goto out_err;
}
exop = mnt->mnt_sb->s_export_op;
/* change the handle size to multiple of sizeof(u32) */
handle_size = handle->handle_size >> 2;
/*
* GPFS overload acceptable callback. To make GPFS return
* 1 set svc->ex_flags
*/
memset(&svc, 0, sizeof(svc));
svc.ex_flags = NFSEXP_NOSUBTREECHECK;
dentry = CALL(exop, decode_fh) (mnt->mnt_sb,
(__u32 *) handle->f_handle,
handle_size, handle->handle_type,
vfs_dentry_acceptable, &svc);
if(IS_ERR(dentry))
{
retval = PTR_ERR(dentry);
goto out_mnt;
}
if(!dentry)
{
retval = -ESTALE;
goto out_mnt;
}
*mntp = mnt;
return dentry;
out_mnt:
mntput(mnt);
out_err:
return ERR_PTR(retval);
}
