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dmu_buf_will_clone: fix race in transition back to NOFILL #15566

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Nov 28, 2023
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dmu_buf_will_clone: fix race in transition back to NOFILL #15566

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10 changes: 9 additions & 1 deletion module/zfs/dbuf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2715,15 +2715,23 @@ dmu_buf_will_clone(dmu_buf_t *db_fake, dmu_tx_t *tx)
* writes and clones into this block.
*/
mutex_enter(&db->db_mtx);
DBUF_VERIFY(db);
VERIFY(!dbuf_undirty(db, tx));
ASSERT0P(dbuf_find_dirty_eq(db, tx->tx_txg));
if (db->db_buf != NULL) {
arc_buf_destroy(db->db_buf, db);
db->db_buf = NULL;
dbuf_clear_data(db);
}

db->db_state = DB_NOFILL;
DTRACE_SET_STATE(db, "allocating NOFILL buffer for clone");

DBUF_VERIFY(db);
mutex_exit(&db->db_mtx);

dmu_buf_will_not_fill(db_fake, tx);
dbuf_noread(db);
(void) dbuf_dirty(db, tx);
}

void
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