static void dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx) { dmu_buf_impl_t *db; int txgoff = tx->tx_txg & TXG_MASK; int nblkptr = dn->dn_phys->dn_nblkptr; int old_toplvl = dn->dn_phys->dn_nlevels - 1; int new_level = dn->dn_next_nlevels[txgoff]; int i; rw_enter(&dn->dn_struct_rwlock, RW_WRITER); /* this dnode can't be paged out because it's dirty */ ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); ASSERT(new_level > 1 && dn->dn_phys->dn_nlevels > 0); db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG); ASSERT(db != NULL); dn->dn_phys->dn_nlevels = new_level; dprintf("os=%p obj=%llu, increase to %d\n", dn->dn_objset, dn->dn_object, dn->dn_phys->dn_nlevels); /* check for existing blkptrs in the dnode */ for (i = 0; i < nblkptr; i++) if (!BP_IS_HOLE(&dn->dn_phys->dn_blkptr[i])) break; if (i != nblkptr) { /* transfer dnode's block pointers to new indirect block */ (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED|DB_RF_HAVESTRUCT); ASSERT(db->db.db_data); ASSERT(arc_released(db->db_buf)); ASSERT3U(sizeof (blkptr_t) * nblkptr, <=, db->db.db_size); bcopy(dn->dn_phys->dn_blkptr, db->db.db_data, sizeof (blkptr_t) * nblkptr); arc_buf_freeze(db->db_buf); }
static void dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx) { dmu_buf_impl_t *db; int txgoff = tx->tx_txg & TXG_MASK; int nblkptr = dn->dn_phys->dn_nblkptr; int old_toplvl = dn->dn_phys->dn_nlevels - 1; int new_level = dn->dn_next_nlevels[txgoff]; int i; rw_enter(&dn->dn_struct_rwlock, RW_WRITER); /* this dnode can't be paged out because it's dirty */ ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); ASSERT(new_level > 1 && dn->dn_phys->dn_nlevels > 0); db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG); ASSERT(db != NULL); dn->dn_phys->dn_nlevels = new_level; dprintf("os=%p obj=%llu, increase to %d\n", dn->dn_objset, dn->dn_object, dn->dn_phys->dn_nlevels); /* transfer dnode's block pointers to new indirect block */ (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED|DB_RF_HAVESTRUCT); ASSERT(db->db.db_data); ASSERT(arc_released(db->db_buf)); ASSERT3U(sizeof (blkptr_t) * nblkptr, <=, db->db.db_size); bcopy(dn->dn_phys->dn_blkptr, db->db.db_data, sizeof (blkptr_t) * nblkptr); arc_buf_freeze(db->db_buf); /* set dbuf's parent pointers to new indirect buf */ for (i = 0; i < nblkptr; i++) { dmu_buf_impl_t *child = dbuf_find(dn->dn_objset, dn->dn_object, old_toplvl, i); if (child == NULL) continue; #ifdef DEBUG DB_DNODE_ENTER(child); ASSERT3P(DB_DNODE(child), ==, dn); DB_DNODE_EXIT(child); #endif /* DEBUG */ if (child->db_parent && child->db_parent != dn->dn_dbuf) { ASSERT(child->db_parent->db_level == db->db_level); ASSERT(child->db_blkptr != &dn->dn_phys->dn_blkptr[child->db_blkid]); mutex_exit(&child->db_mtx); continue; } ASSERT(child->db_parent == NULL || child->db_parent == dn->dn_dbuf); child->db_parent = db; dbuf_add_ref(db, child); if (db->db.db_data) child->db_blkptr = (blkptr_t *)db->db.db_data + i; else child->db_blkptr = NULL; dprintf_dbuf_bp(child, child->db_blkptr, "changed db_blkptr to new indirect %s", ""); mutex_exit(&child->db_mtx); } bzero(dn->dn_phys->dn_blkptr, sizeof (blkptr_t) * nblkptr); dbuf_rele(db, FTAG); rw_exit(&dn->dn_struct_rwlock); }