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);
}
