tdb2: reduce transaction before writing to recovery area.

[ccan] / ccan / tdb2 / io.c

diff --git a/ccan/tdb2/io.c b/ccan/tdb2/io.c
index 240a1c038da368c274363cb3cfcd37945a517a0e..8c5f45f30827c9e722227e3787797288713e056e 100644 (file)
--- a/ccan/tdb2/io.c
+++ b/ccan/tdb2/io.c
@@ -48,8 +48,13 @@ void tdb_mmap(struct tdb_context *tdb)
        if (tdb->flags & TDB_NOMMAP)
                return;
 
-       tdb->file->map_ptr = mmap(NULL, tdb->file->map_size, tdb->mmap_flags,
-                                 MAP_SHARED, tdb->file->fd, 0);
+       /* size_t can be smaller than off_t. */
+       if ((size_t)tdb->file->map_size == tdb->file->map_size) {
+               tdb->file->map_ptr = mmap(NULL, tdb->file->map_size,
+                                         tdb->mmap_flags,
+                                         MAP_SHARED, tdb->file->fd, 0);
+       } else
+               tdb->file->map_ptr = MAP_FAILED;
 
        /*
         * NB. When mmap fails it returns MAP_FAILED *NOT* NULL !!!!
@@ -125,6 +130,7 @@ static enum TDB_ERROR tdb_oob(struct tdb_context *tdb, tdb_off_t len,
 /* Endian conversion: we only ever deal with 8 byte quantities */
 void *tdb_convert(const struct tdb_context *tdb, void *buf, tdb_len_t size)
 {
+       assert(size % 8 == 0);
        if (unlikely((tdb->flags & TDB_CONVERT)) && buf) {
                uint64_t i, *p = (uint64_t *)buf;
                for (i = 0; i < size / 8; i++)