tdb2: tdb_foreach()

[ccan] / ccan / tdb2 / open.c

diff --git a/ccan/tdb2/open.c b/ccan/tdb2/open.c
index 277a95f9e8ba7bb72caed6ac434f7ccb798ebc1c..555df9512608c1ba0269461e6f5dc823de9ab4f6 100644 (file)
--- a/ccan/tdb2/open.c
+++ b/ccan/tdb2/open.c
@@ -19,20 +19,20 @@
 #include <ccan/hash/hash.h>
 #include <assert.h>
 
-/* all lock info, to detect double-opens (fcntl file don't nest!) */
-static struct tdb_file *files = NULL;
+/* all tdbs, to detect double-opens (fcntl file don't nest!) */
+static struct tdb_context *tdbs = NULL;
 
 static struct tdb_file *find_file(dev_t device, ino_t ino)
 {
-       struct tdb_file *i;
+       struct tdb_context *i;
 
-       for (i = files; i; i = i->next) {
-               if (i->device == device && i->inode == ino) {
-                       i->refcnt++;
-                       break;
+       for (i = tdbs; i; i = i->next) {
+               if (i->file->device == device && i->file->inode == ino) {
+                       i->file->refcnt++;
+                       return i->file;
                }
        }
-       return i;
+       return NULL;
 }
 
 static bool read_all(int fd, void *buf, size_t len)
@@ -483,7 +483,6 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
                        goto fail;
                }
 
-               tdb->file->next = files;
                tdb->file->fd = fd;
                tdb->file->device = st.st_dev;
                tdb->file->inode = st.st_ino;
@@ -596,9 +595,8 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
                goto fail;
        }
 
-       /* Add to linked list if we're new. */
-       if (tdb->file->refcnt == 1)
-               files = tdb->file;
+       tdb->next = tdbs;
+       tdbs = tdb;
        return tdb;
 
  fail:
@@ -653,6 +651,7 @@ fail_errno:
 int tdb_close(struct tdb_context *tdb)
 {
        int ret = 0;
+       struct tdb_context **i;
 
        tdb_trace(tdb, "tdb_close");
 
@@ -667,24 +666,22 @@ int tdb_close(struct tdb_context *tdb)
                        tdb_munmap(tdb->file);
        }
        if (tdb->file) {
-               struct tdb_file **i;
-
                tdb_lock_cleanup(tdb);
                if (--tdb->file->refcnt == 0) {
                        ret = close(tdb->file->fd);
-
-                       /* Remove from files list */
-                       for (i = &files; *i; i = &(*i)->next) {
-                               if (*i == tdb->file) {
-                                       *i = tdb->file->next;
-                                       break;
-                               }
-                       }
                        free(tdb->file->lockrecs);
                        free(tdb->file);
                }
        }
 
+       /* Remove from tdbs list */
+       for (i = &tdbs; *i; i = &(*i)->next) {
+               if (*i == tdb) {
+                       *i = tdb->next;
+                       break;
+               }
+       }
+
 #ifdef TDB_TRACE
        close(tdb->tracefd);
 #endif
@@ -692,3 +689,13 @@ int tdb_close(struct tdb_context *tdb)
 
        return ret;
 }
+
+void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p)
+{
+       struct tdb_context *i;
+
+       for (i = tdbs; i; i = i->next) {
+               if (fn(i, p) != 0)
+                       break;
+       }
+}