+static const char *placement_name[] = {
+ [PLACEMENT_CHAR_POLICY] = "CHAR",
+ [PLACEMENT_NID_POLICY] = "NID"
+};
+
+static placement_policy_t placement_name2policy(char *name, int len)
+{
+ int i;
+
+ for (i = 0; i < PLACEMENT_MAX_POLICY; i++) {
+ if (!strncmp(placement_name[i], name, len))
+ return i;
+ }
+ return PLACEMENT_INVAL_POLICY;
+}
+
+static const char *placement_policy2name(placement_policy_t placement)
+{
+ LASSERT(placement < PLACEMENT_MAX_POLICY);
+ return placement_name[placement];
+}
+
+static int lmv_rd_placement(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ struct obd_device *dev = (struct obd_device*)data;
+ struct lmv_obd *lmv;
+
+ LASSERT(dev != NULL);
+ lmv = &dev->u.lmv;
+ *eof = 1;
+ return snprintf(page, count, "%s\n",
+ placement_policy2name(lmv->lmv_placement));
+
+}
+
+#define MAX_POLICY_STRING_SIZE 64
+
+static int lmv_wr_placement(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ struct obd_device *dev = (struct obd_device *)data;
+ char dummy[MAX_POLICY_STRING_SIZE + 1];
+ int len = count;
+ placement_policy_t policy;
+ struct lmv_obd *lmv;
+
+ if (cfs_copy_from_user(dummy, buffer, MAX_POLICY_STRING_SIZE))
+ return -EFAULT;
+
+ LASSERT(dev != NULL);
+ lmv = &dev->u.lmv;
+
+ if (len > MAX_POLICY_STRING_SIZE)
+ len = MAX_POLICY_STRING_SIZE;
+
+ if (dummy[len - 1] == '\n')
+ len--;
+ dummy[len] = '\0';
+
+ policy = placement_name2policy(dummy, len);
+ if (policy != PLACEMENT_INVAL_POLICY) {
+ cfs_spin_lock(&lmv->lmv_lock);
+ lmv->lmv_placement = policy;
+ cfs_spin_unlock(&lmv->lmv_lock);
+ } else {
+ CERROR("Invalid placement policy \"%s\"!\n", dummy);
+ return -EINVAL;
+ }
+ return count;
+}
+