lib/tdb: TDB_TRACE support (for developers)

[samba.git] / lib / tdb / common / open.c

diff --git a/lib/tdb/common/open.c b/lib/tdb/common/open.c
index b19e4cea293df769a588db89c71df25529d677ec..f0061d7b3144dcc5572999201e53d26a93472445 100644 (file)
--- a/lib/tdb/common/open.c
+++ b/lib/tdb/common/open.c
@@ -205,6 +205,10 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
                        TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: tdb_new_database failed!"));
                        goto fail;
                }
                        TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: tdb_new_database failed!"));
                        goto fail;
                }

+#ifdef TDB_TRACE
+               /* All tracing will fail.  That's ok. */
+               tdb->tracefd = -1;
+#endif

                goto internal;
        }
 
                goto internal;
        }
 


@@ -240,17 +244,19 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 
        errno = 0;
        if (read(tdb->fd, &tdb->header, sizeof(tdb->header)) != sizeof(tdb->header)
 
        errno = 0;
        if (read(tdb->fd, &tdb->header, sizeof(tdb->header)) != sizeof(tdb->header)

-           || strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0
-           || (tdb->header.version != TDB_VERSION
-               && !(rev = (tdb->header.version==TDB_BYTEREV(TDB_VERSION))))) {
-               /* its not a valid database - possibly initialise it */
+           || strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0) {

                if (!(open_flags & O_CREAT) || tdb_new_database(tdb, hash_size) == -1) {
                        if (errno == 0) {
                if (!(open_flags & O_CREAT) || tdb_new_database(tdb, hash_size) == -1) {
                        if (errno == 0) {

-                       errno = EIO; /* ie bad format or something */
+                               errno = EIO; /* ie bad format or something */

                        }
                        goto fail;
                }
                rev = (tdb->flags & TDB_CONVERT);
                        }
                        goto fail;
                }
                rev = (tdb->flags & TDB_CONVERT);

+       } else if (tdb->header.version != TDB_VERSION
+                  && !(rev = (tdb->header.version==TDB_BYTEREV(TDB_VERSION)))) {
+               /* wrong version */
+               errno = EIO;
+               goto fail;

        }
        vp = (unsigned char *)&tdb->header.version;
        vertest = (((uint32_t)vp[0]) << 24) | (((uint32_t)vp[1]) << 16) |
        }
        vp = (unsigned char *)&tdb->header.version;
        vertest = (((uint32_t)vp[0]) << 24) | (((uint32_t)vp[1]) << 16) |


@@ -313,6 +319,22 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
                goto fail;
        }
 
                goto fail;
        }
 

+#ifdef TDB_TRACE
+       {
+               char tracefile[strlen(name) + 32];
+
+               snprintf(tracefile, sizeof(tracefile),
+                        "%s.trace.%li", name, (long)getpid());
+               tdb->tracefd = open(tracefile, O_WRONLY|O_CREAT|O_EXCL, 0600);
+               if (tdb->tracefd >= 0) {
+                       tdb_enable_seqnum(tdb);
+                       tdb_trace_open(tdb, "tdb_open", hash_size, tdb_flags,
+                                      open_flags);
+               } else
+                       TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to open trace file %s!\n", tracefile));
+       }
+#endif
+

  internal:
        /* Internal (memory-only) databases skip all the code above to
         * do with disk files, and resume here by releasing their
  internal:
        /* Internal (memory-only) databases skip all the code above to
         * do with disk files, and resume here by releasing their


@@ -328,7 +350,10 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 
        if (!tdb)
                return NULL;
 
        if (!tdb)
                return NULL;

-       
+
+#ifdef TDB_TRACE
+       close(tdb->tracefd);
+#endif

        if (tdb->map_ptr) {
                if (tdb->flags & TDB_INTERNAL)
                        SAFE_FREE(tdb->map_ptr);
        if (tdb->map_ptr) {
                if (tdb->flags & TDB_INTERNAL)
                        SAFE_FREE(tdb->map_ptr);


@@ -364,8 +389,9 @@ int tdb_close(struct tdb_context *tdb)
        struct tdb_context **i;
        int ret = 0;
 
        struct tdb_context **i;
        int ret = 0;
 

+       tdb_trace(tdb, "tdb_close");

        if (tdb->transaction) {
        if (tdb->transaction) {

-               tdb_transaction_cancel(tdb);
+               _tdb_transaction_cancel(tdb);

        }
 
        if (tdb->map_ptr) {
        }
 
        if (tdb->map_ptr) {


@@ -387,6 +413,9 @@ int tdb_close(struct tdb_context *tdb)
                }
        }
 
                }
        }
 

+#ifdef TDB_TRACE
+       close(tdb->tracefd);
+#endif

        memset(tdb, 0, sizeof(*tdb));
        SAFE_FREE(tdb);
 
        memset(tdb, 0, sizeof(*tdb));
        SAFE_FREE(tdb);
 


@@ -405,11 +434,12 @@ void *tdb_get_logging_private(struct tdb_context *tdb)
        return tdb->log.log_private;
 }
 
        return tdb->log.log_private;
 }
 

-/* reopen a tdb - this can be used after a fork to ensure that we have an independent
-   seek pointer from our parent and to re-establish locks */
-int tdb_reopen(struct tdb_context *tdb)
+static int tdb_reopen_internal(struct tdb_context *tdb, bool active_lock)

 {
 {

+#if !defined(LIBREPLACE_PREAD_NOT_REPLACED) || \
+       !defined(LIBREPLACE_PWRITE_NOT_REPLACED)

        struct stat st;
        struct stat st;

+#endif

 
        if (tdb->flags & TDB_INTERNAL) {
                return 0; /* Nothing to do. */
 
        if (tdb->flags & TDB_INTERNAL) {
                return 0; /* Nothing to do. */


@@ -425,6 +455,9 @@ int tdb_reopen(struct tdb_context *tdb)
                goto fail;
        }
 
                goto fail;
        }
 

+/* If we have real pread & pwrite, we can skip reopen. */
+#if !defined(LIBREPLACE_PREAD_NOT_REPLACED) || \
+       !defined(LIBREPLACE_PWRITE_NOT_REPLACED)

        if (tdb_munmap(tdb) != 0) {
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: munmap failed (%s)\n", strerror(errno)));
                goto fail;
        if (tdb_munmap(tdb) != 0) {
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: munmap failed (%s)\n", strerror(errno)));
                goto fail;


@@ -436,11 +469,6 @@ int tdb_reopen(struct tdb_context *tdb)
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: open failed (%s)\n", strerror(errno)));
                goto fail;
        }
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: open failed (%s)\n", strerror(errno)));
                goto fail;
        }

-       if ((tdb->flags & TDB_CLEAR_IF_FIRST) && 
-           (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)) {
-               TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: failed to obtain active lock\n"));
-               goto fail;
-       }

        if (fstat(tdb->fd, &st) != 0) {
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: fstat failed (%s)\n", strerror(errno)));
                goto fail;
        if (fstat(tdb->fd, &st) != 0) {
                TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: fstat failed (%s)\n", strerror(errno)));
                goto fail;


@@ -450,6 +478,13 @@ int tdb_reopen(struct tdb_context *tdb)
                goto fail;
        }
        tdb_mmap(tdb);
                goto fail;
        }
        tdb_mmap(tdb);

+#endif /* fake pread or pwrite */
+
+       if (active_lock &&
+           (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)) {
+               TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: failed to obtain active lock\n"));
+               goto fail;
+       }

 
        return 0;
 
 
        return 0;
 


@@ -458,12 +493,21 @@ fail:
        return -1;
 }
 
        return -1;
 }
 

+/* reopen a tdb - this can be used after a fork to ensure that we have an independent
+   seek pointer from our parent and to re-establish locks */
+int tdb_reopen(struct tdb_context *tdb)
+{
+       return tdb_reopen_internal(tdb, tdb->flags & TDB_CLEAR_IF_FIRST);
+}
+

 /* reopen all tdb's */
 int tdb_reopen_all(int parent_longlived)
 {
        struct tdb_context *tdb;
 
        for (tdb=tdbs; tdb; tdb = tdb->next) {
 /* reopen all tdb's */
 int tdb_reopen_all(int parent_longlived)
 {
        struct tdb_context *tdb;
 
        for (tdb=tdbs; tdb; tdb = tdb->next) {

+               bool active_lock = (tdb->flags & TDB_CLEAR_IF_FIRST);
+

                /*
                 * If the parent is longlived (ie. a
                 * parent daemon architecture), we know
                /*
                 * If the parent is longlived (ie. a
                 * parent daemon architecture), we know


@@ -477,10 +521,10 @@ int tdb_reopen_all(int parent_longlived)
                 */
                if (parent_longlived) {
                        /* Ensure no clear-if-first. */
                 */
                if (parent_longlived) {
                        /* Ensure no clear-if-first. */

-                       tdb->flags &= ~TDB_CLEAR_IF_FIRST;
+                       active_lock = false;

                }
 
                }
 

-               if (tdb_reopen(tdb) != 0)
+               if (tdb_reopen_internal(tdb, active_lock) != 0)

                        return -1;
        }
 
                        return -1;
        }