fs: limit filesystem stacking depth

[pandora-kernel.git] / include / linux / device-mapper.h

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 99e3e50..213a870 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -10,6 +10,7 @@
 
 #include <linux/bio.h>
 #include <linux/blkdev.h>
+#include <linux/ratelimit.h>
 
 struct dm_dev;
 struct dm_target;
@@ -71,8 +72,8 @@ typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
 typedef int (*dm_preresume_fn) (struct dm_target *ti);
 typedef void (*dm_resume_fn) (struct dm_target *ti);
 
-typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
-                            char *result, unsigned int maxlen);
+typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
+                             char *result, unsigned maxlen);
 
 typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
 
@@ -115,6 +116,8 @@ struct dm_dev {
        char name[16];
 };
 
+dev_t dm_get_dev_t(const char *path);
+
 /*
  * Constructors should call these functions to ensure destination devices
  * are opened/closed correctly.
@@ -127,10 +130,6 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d);
  * Information about a target type
  */
 
-/*
- * Target features
- */
-
 struct target_type {
        uint64_t features;
        const char *name;
@@ -159,6 +158,30 @@ struct target_type {
        struct list_head list;
 };
 
+/*
+ * Target features
+ */
+
+/*
+ * Any table that contains an instance of this target must have only one.
+ */
+#define DM_TARGET_SINGLETON            0x00000001
+#define dm_target_needs_singleton(type)        ((type)->features & DM_TARGET_SINGLETON)
+
+/*
+ * Indicates that a target does not support read-only devices.
+ */
+#define DM_TARGET_ALWAYS_WRITEABLE     0x00000002
+#define dm_target_always_writeable(type) \
+               ((type)->features & DM_TARGET_ALWAYS_WRITEABLE)
+
+/*
+ * Any device that contains a table with an instance of this target may never
+ * have tables containing any different target type.
+ */
+#define DM_TARGET_IMMUTABLE            0x00000004
+#define dm_target_is_immutable(type)   ((type)->features & DM_TARGET_IMMUTABLE)
+
 struct dm_target {
        struct dm_table *table;
        struct target_type *type;
@@ -375,6 +398,14 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
  *---------------------------------------------------------------*/
 #define DM_NAME "device-mapper"
 
+#ifdef CONFIG_PRINTK
+extern struct ratelimit_state dm_ratelimit_state;
+
+#define dm_ratelimit() __ratelimit(&dm_ratelimit_state)
+#else
+#define dm_ratelimit() 0
+#endif
+
 #define DMCRIT(f, arg...) \
        printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
 
@@ -382,7 +413,7 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
        printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
 #define DMERR_LIMIT(f, arg...) \
        do { \
-               if (printk_ratelimit()) \
+               if (dm_ratelimit())     \
                        printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
                               f "\n", ## arg); \
        } while (0)
@@ -391,7 +422,7 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
        printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
 #define DMWARN_LIMIT(f, arg...) \
        do { \
-               if (printk_ratelimit()) \
+               if (dm_ratelimit())     \
                        printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
                               f "\n", ## arg); \
        } while (0)
@@ -400,7 +431,7 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
        printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
 #define DMINFO_LIMIT(f, arg...) \
        do { \
-               if (printk_ratelimit()) \
+               if (dm_ratelimit())     \
                        printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
                               "\n", ## arg); \
        } while (0)
@@ -410,7 +441,7 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
        printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
 #  define DMDEBUG_LIMIT(f, arg...) \
        do { \
-               if (printk_ratelimit()) \
+               if (dm_ratelimit())     \
                        printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
                               "\n", ## arg); \
        } while (0)