+static inline
+struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
+{
+ LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
+ LOV_USER_MAGIC_COMP_V1, "Wrong magic %x\n",
+ le32_to_cpu(comp->lcm_magic));
+ LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
+ "bad index %d, max = %d\n",
+ i, le16_to_cpu(comp->lcm_entry_count));
+
+ return &comp->lcm_entries[i];
+}
+
+#define for_each_comp_entry_v1(comp, entry) \
+ for (entry = comp_entry_v1(comp, 0); \
+ entry <= comp_entry_v1(comp, \
+ le16_to_cpu(comp->lcm_entry_count) - 1); \
+ entry++)
+
+int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1)
+{
+ struct lov_comp_md_entry_v1 *ent, *dom_ent;
+ __u16 entries;
+ __u32 dom_off, dom_size, comp_size;
+ void *blob_src, *blob_dst;
+ unsigned int blob_size, blob_shift;
+
+ entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
+ /* if file has only DoM stripe return just error */
+ if (entries == 0)
+ return -EFBIG;
+
+ comp_size = le32_to_cpu(comp_v1->lcm_size);
+ dom_ent = &comp_v1->lcm_entries[0];
+ dom_off = le32_to_cpu(dom_ent->lcme_offset);
+ dom_size = le32_to_cpu(dom_ent->lcme_size);
+
+ /* shift entries array first */
+ comp_v1->lcm_entry_count = cpu_to_le16(entries);
+ memmove(dom_ent, dom_ent + 1,
+ entries * sizeof(struct lov_comp_md_entry_v1));
+
+ /* now move blob of layouts */
+ blob_dst = (void *)comp_v1 + dom_off - sizeof(*dom_ent);
+ blob_src = (void *)comp_v1 + dom_off + dom_size;
+ blob_size = (unsigned long)((void *)comp_v1 + comp_size - blob_src);
+ blob_shift = sizeof(*dom_ent) + dom_size;
+
+ memmove(blob_dst, blob_src, blob_size);
+
+ for_each_comp_entry_v1(comp_v1, ent) {
+ __u32 off;
+
+ off = le32_to_cpu(ent->lcme_offset);
+ ent->lcme_offset = cpu_to_le32(off - blob_shift);
+ }
+
+ comp_v1->lcm_size = cpu_to_le32(comp_size - blob_shift);
+
+ /* notify a caller to re-check entry */
+ return -ERESTART;
+}
+