tdb2: add TDB_RDONLY flag, allow setting/unsetting it.

[ccan] / ccan / tdb2 / transaction.c

diff --git a/ccan/tdb2/transaction.c b/ccan/tdb2/transaction.c
index b13223bc2e18c7f82b6fdf4615adc69ca14bbffb..a29acf96e2d417c8c3d79313f8ada959f7c5719c 100644 (file)
--- a/ccan/tdb2/transaction.c
+++ b/ccan/tdb2/transaction.c
@@ -348,15 +348,14 @@ static void transaction_write_existing(struct tdb_context *tdb, tdb_off_t off,
 static enum TDB_ERROR transaction_oob(struct tdb_context *tdb, tdb_off_t len,
                                      bool probe)
 {
-       if (len <= tdb->file->map_size) {
+       if (len <= tdb->file->map_size || probe) {
                return TDB_SUCCESS;
        }
-       if (!probe) {
-               tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
-                          "tdb_oob len %lld beyond transaction size %lld",
-                          (long long)len,
-                          (long long)tdb->file->map_size);
-       }
+
+       tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+                  "tdb_oob len %lld beyond transaction size %lld",
+                  (long long)len,
+                  (long long)tdb->file->map_size);
        return TDB_ERR_IO;
 }
 
@@ -524,13 +523,22 @@ enum TDB_ERROR tdb_transaction_start(struct tdb_context *tdb)
 
        tdb->stats.transactions++;
        /* some sanity checks */
-       if (tdb->read_only || (tdb->flags & TDB_INTERNAL)) {
+       if (tdb->flags & TDB_INTERNAL) {
                return tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+                                                   TDB_LOG_USE_ERROR,
+                                                   "tdb_transaction_start:"
+                                                   " cannot start a"
+                                                   " transaction on an"
+                                                   " internal tdb");
+       }
+
+       if (tdb->flags & TDB_RDONLY) {
+               return tdb->last_error = tdb_logerr(tdb, TDB_ERR_RDONLY,
                                                    TDB_LOG_USE_ERROR,
                                                    "tdb_transaction_start:"
                                                    " cannot start a"
                                                    " transaction on a "
-                                                   "read-only or internal db");
+                                                   " read-only tdb");
        }
 
        /* cope with nested tdb_transaction_start() calls */
@@ -1188,7 +1196,7 @@ enum TDB_ERROR tdb_transaction_recover(struct tdb_context *tdb)
                return TDB_SUCCESS;
        }
 
-       if (tdb->read_only) {
+       if (tdb->flags & TDB_RDONLY) {
                return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
                                  "tdb_transaction_recover:"
                                  " attempt to recover read only database");