ceph: let the set_layout ioctl set single traits

Previously we were validating the passed-in stripe unit, object size,
and stripe count against each other (and not testing most other stuff).
Instead, make sure that the composed previous layout and new values are valid,
and only send the new values to the MDS. This lets users change the
pool without setting the whole layout, for instance.
Signed-off-by: Greg Farnum <gregory.farnum@dreamhost.com>

fs/ceph/ioctl.c

@@ -42,17 +42,39 @@ static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
 	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 	struct ceph_mds_request *req;
 	struct ceph_ioctl_layout l;
+	struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
+	struct ceph_ioctl_layout nl;
 	int err, i;
 
-	/* 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))
+	/* validate changed params against current layout */
+	err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
+	if (!err) {
+		nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
+		nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
+		nl.object_size = ceph_file_layout_object_size(ci->i_layout);
+		nl.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
+		nl.preferred_osd =
+				(s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
+	} else
+		return err;
+
+	if (l.stripe_count)
+		nl.stripe_count = l.stripe_count;
+	if (l.stripe_unit)
+		nl.stripe_unit = l.stripe_unit;
+	if (l.object_size)
+		nl.object_size = l.object_size;
+	if (l.data_pool)
+		nl.data_pool = l.data_pool;
+	if (l.preferred_osd)
+		nl.preferred_osd = l.preferred_osd;
+
+	if ((nl.object_size & ~PAGE_MASK) ||
+	    (nl.stripe_unit & ~PAGE_MASK) ||
+	    ((unsigned)nl.object_size % (unsigned)nl.stripe_unit))
 		return -EINVAL;
 
 	/* make sure it's a valid data pool */