===================================================================
@@ -512,8 +512,6 @@ static int list_versions(struct dm_ioctl
return 0;
}
-
-
static int check_name(const char *name)
{
if (strchr(name, '/')) {
@@ -525,6 +523,40 @@ static int check_name(const char *name)
}
/*
+ * On successful return, the caller must not attempt to acquire
+ * _hash_lock without first calling dm_table_put, because dm_table_destroy
+ * waits for this dm_table_put and could be called under this lock.
+ */
+static struct dm_table *dm_get_inactive_table(struct mapped_device *md)
+{
+ struct hash_cell *hc;
+ struct dm_table *table = NULL;
+
+ down_read(&_hash_lock);
+ hc = dm_get_mdptr(md);
+ if (!hc || hc->md != md) {
+ DMWARN("device has been removed from the dev hash table.");
+ goto out;
+ }
+
+ table = hc->new_map;
+ if (table)
+ dm_table_get(table);
+
+out:
+ up_read(&_hash_lock);
+
+ return table;
+}
+
+static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md,
+ struct dm_ioctl *param)
+{
+ return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ?
+ dm_get_inactive_table(md) : dm_get_live_table(md);
+}
+
+/*
* Fills in a dm_ioctl structure, ready for sending back to
* userland.
*/
@@ -548,18 +580,30 @@ static int __dev_status(struct mapped_de
*/
param->open_count = dm_open_count(md);
- if (get_disk_ro(disk))
- param->flags |= DM_READONLY_FLAG;
-
param->event_nr = dm_get_event_nr(md);
+ param->target_count = 0;
table = dm_get_live_table(md);
if (table) {
- param->flags |= DM_ACTIVE_PRESENT_FLAG;
- param->target_count = dm_table_get_num_targets(table);
+ if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) {
+ if (get_disk_ro(disk))
+ param->flags |= DM_READONLY_FLAG;
+ param->target_count = dm_table_get_num_targets(table);
+ }
dm_table_put(table);
- } else
- param->target_count = 0;
+
+ param->flags |= DM_ACTIVE_PRESENT_FLAG;
+ }
+
+ if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) {
+ table = dm_get_inactive_table(md);
+ if (table) {
+ if (!(dm_table_get_mode(table) & FMODE_WRITE))
+ param->flags |= DM_READONLY_FLAG;
+ param->target_count = dm_table_get_num_targets(table);
+ dm_table_put(table);
+ }
+ }
return 0;
}
@@ -982,7 +1026,7 @@ static int dev_wait(struct dm_ioctl *par
if (r)
goto out;
- table = dm_get_live_table(md);
+ table = dm_get_live_or_inactive_table(md, param);
if (table) {
retrieve_status(table, param, param_size);
dm_table_put(table);
@@ -1215,7 +1259,7 @@ static int table_deps(struct dm_ioctl *p
if (r)
goto out;
- table = dm_get_live_table(md);
+ table = dm_get_live_or_inactive_table(md, param);
if (table) {
retrieve_deps(table, param, param_size);
dm_table_put(table);
@@ -1244,13 +1288,13 @@ static int table_status(struct dm_ioctl
if (r)
goto out;
- table = dm_get_live_table(md);
+ table = dm_get_live_or_inactive_table(md, param);
if (table) {
retrieve_status(table, param, param_size);
dm_table_put(table);
}
- out:
+out:
dm_put(md);
return r;
}
===================================================================
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2001 - 2003 Sistina Software (UK) Limited.
- * Copyright (C) 2004 - 2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004 - 2009 Red Hat, Inc. All rights reserved.
*
* This file is released under the LGPL.
*/
@@ -266,9 +266,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 15
+#define DM_VERSION_MINOR 16
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2009-04-01)"
+#define DM_VERSION_EXTRA "-ioctl (2009-11-05)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
@@ -309,4 +309,11 @@ enum {
*/
#define DM_NOFLUSH_FLAG (1 << 11) /* In */
+/*
+ * If set, any table information returned will relate to the inactive
+ * table instead of the live one. Always check DM_INACTIVE_PRESENT_FLAG
+ * is set before using the data returned.
+ */
+#define DM_QUERY_INACTIVE_TABLE_FLAG (1 << 12) /* In */
+
#endif /* _LINUX_DM_IOCTL_H */