Make ZFS filesystem id persistent across different machines

[zfs.git] / module / zfs / spa_misc.c

diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index 487a76d..4a8e6ad 100644 (file)
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -20,6 +20,8 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011 by Delphix. All rights reserved.
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  */
 
 #include <sys/zfs_context.h>
@@ -233,21 +235,6 @@ static avl_tree_t spa_l2cache_avl;
 kmem_cache_t *spa_buffer_pool;
 int spa_mode_global;
 
-#ifdef ZFS_DEBUG
-/* Everything except dprintf is on by default in debug builds */
-int zfs_flags = ~ZFS_DEBUG_DPRINTF;
-#else
-int zfs_flags = 0;
-#endif
-
-/*
- * zfs_recover can be set to nonzero to attempt to recover from
- * otherwise-fatal errors, typically caused by on-disk corruption.  When
- * set, calls to zfs_panic_recover() will turn into warning messages.
- */
-int zfs_recover = 0;
-
-
 /*
  * ==========================================================================
  * SPA config locking
@@ -438,7 +425,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
 
        ASSERT(MUTEX_HELD(&spa_namespace_lock));
 
-       spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP | KM_NODEBUG);
+       spa = kmem_zalloc(sizeof (spa_t), KM_PUSHPAGE | KM_NODEBUG);
 
        mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
        mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
@@ -485,12 +472,12 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
        list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
            offsetof(spa_config_dirent_t, scd_link));
 
-       dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
+       dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_PUSHPAGE);
        dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
        list_insert_head(&spa->spa_config_list, dp);
 
        VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME,
-           KM_SLEEP) == 0);
+           KM_PUSHPAGE) == 0);
 
        if (config != NULL)
                VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
@@ -660,7 +647,7 @@ spa_aux_add(vdev_t *vd, avl_tree_t *avl)
        if ((aux = avl_find(avl, &search, &where)) != NULL) {
                aux->aux_count++;
        } else {
-               aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
+               aux = kmem_zalloc(sizeof (spa_aux_t), KM_PUSHPAGE);
                aux->aux_guid = vd->vdev_guid;
                aux->aux_count = 1;
                avl_insert(avl, aux, where);
@@ -1144,7 +1131,7 @@ spa_strdup(const char *s)
        char *new;
 
        len = strlen(s);
-       new = kmem_alloc(len + 1, KM_SLEEP);
+       new = kmem_alloc(len + 1, KM_PUSHPAGE);
        bcopy(s, new, len);
        new[len] = '\0';
 
@@ -1216,16 +1203,6 @@ spa_freeze(spa_t *spa)
                txg_wait_synced(spa_get_dsl(spa), freeze_txg);
 }
 
-void
-zfs_panic_recover(const char *fmt, ...)
-{
-       va_list adx;
-
-       va_start(adx, fmt);
-       vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
-       va_end(adx);
-}
-
 /*
  * This is a stripped-down version of strtoull, suitable only for converting
  * lowercase hexidecimal numbers that don't overflow.
@@ -1314,13 +1291,24 @@ spa_guid(spa_t *spa)
        /*
         * If we fail to parse the config during spa_load(), we can go through
         * the error path (which posts an ereport) and end up here with no root
-        * vdev.  We stash the original pool guid in 'spa_load_guid' to handle
+        * vdev.  We stash the original pool guid in 'spa_config_guid' to handle
         * this case.
         */
        if (spa->spa_root_vdev != NULL)
                return (spa->spa_root_vdev->vdev_guid);
        else
-               return (spa->spa_load_guid);
+               return (spa->spa_config_guid);
+}
+
+uint64_t
+spa_load_guid(spa_t *spa)
+{
+       /*
+        * This is a GUID that exists solely as a reference for the
+        * purposes of the arc.  It is generated at load time, and
+        * is never written to persistent storage.
+        */
+       return (spa->spa_load_guid);
 }
 
 uint64_t
@@ -1680,6 +1668,12 @@ spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps)
        return (0);
 }
 
+boolean_t
+spa_debug_enabled(spa_t *spa)
+{
+       return (spa->spa_debug);
+}
+
 #if defined(_KERNEL) && defined(HAVE_SPL)
 /* Namespace manipulation */
 EXPORT_SYMBOL(spa_lookup);
@@ -1758,7 +1752,4 @@ EXPORT_SYMBOL(spa_writeable);
 EXPORT_SYMBOL(spa_mode);
 
 EXPORT_SYMBOL(spa_namespace_lock);
-
-module_param(zfs_recover, int, 0644);
-MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors");
 #endif