ceph: add CEPH_MDS_OP_SETDIRLAYOUT and associated ioctl.
[linux-2.6.git] / fs / ceph / ioctl.c
index 899578b..8888c9b 100644 (file)
@@ -92,6 +92,68 @@ static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
 }
 
 /*
+ * Set a layout policy on a directory inode. All items in the tree
+ * rooted at this inode will inherit this layout on creation,
+ * (It doesn't apply retroactively )
+ * unless a subdirectory has its own layout policy.
+ */
+static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
+{
+       struct inode *inode = file->f_dentry->d_inode;
+       struct ceph_mds_request *req;
+       struct ceph_ioctl_layout l;
+       int err, i;
+       struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
+
+       /* copy and validate */
+       if (copy_from_user(&l, arg, sizeof(l)))
+               return -EFAULT;
+
+       if ((l.object_size & ~PAGE_MASK) ||
+           (l.stripe_unit & ~PAGE_MASK) ||
+           !l.stripe_unit ||
+           (l.object_size &&
+               (unsigned)l.object_size % (unsigned)l.stripe_unit))
+               return -EINVAL;
+
+       /* make sure it's a valid data pool */
+       if (l.data_pool > 0) {
+               mutex_lock(&mdsc->mutex);
+               err = -EINVAL;
+               for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
+                       if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
+                               err = 0;
+                               break;
+                       }
+               mutex_unlock(&mdsc->mutex);
+               if (err)
+                       return err;
+       }
+
+       req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
+                                      USE_AUTH_MDS);
+
+       if (IS_ERR(req))
+               return PTR_ERR(req);
+       req->r_inode = igrab(inode);
+
+       req->r_args.setlayout.layout.fl_stripe_unit =
+                       cpu_to_le32(l.stripe_unit);
+       req->r_args.setlayout.layout.fl_stripe_count =
+                       cpu_to_le32(l.stripe_count);
+       req->r_args.setlayout.layout.fl_object_size =
+                       cpu_to_le32(l.object_size);
+       req->r_args.setlayout.layout.fl_pg_pool =
+                       cpu_to_le32(l.data_pool);
+       req->r_args.setlayout.layout.fl_pg_preferred =
+                       cpu_to_le32(l.preferred_osd);
+
+       err = ceph_mdsc_do_request(mdsc, inode, req);
+       ceph_mdsc_put_request(req);
+       return err;
+}
+
+/*
  * Return object name, size/offset information, and location (OSD
  * number, network address) for a given file offset.
  */
@@ -177,11 +239,15 @@ long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case CEPH_IOC_SET_LAYOUT:
                return ceph_ioctl_set_layout(file, (void __user *)arg);
 
+       case CEPH_IOC_SET_LAYOUT_POLICY:
+               return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
+
        case CEPH_IOC_GET_DATALOC:
                return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 
        case CEPH_IOC_LAZYIO:
                return ceph_ioctl_lazyio(file);
        }
+
        return -ENOTTY;
 }