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Date: Mon, 3 Oct 2016 12:22:53 -0700
From: Andy Grover <agrover@...hat.com>
To: gregkh@...uxfoundation.org, snitzer@...hat.com
Cc: dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/9] dm: Move multipath-specific stuff out of dm-uevent.c
There's a little bit of mpath-specific stuff that is in dm-uevent.c,
because all current uevents want to attach DM_PATH and DM_NR_VALID_PATHS
variables to the uevent. Makes sense since all currently defined DM
uevents are for dm-mpath, but is not true for future uevents. Move the
addition of these to dm-mpath.c and expose a few lower-level functions,
dm_build_uevent, dm_uevent_add and dm_uevent_free, for other dm targets to
build their own uevents.
Signed-off-by: Andy Grover <agrover@...hat.com>
---
drivers/md/dm-mpath.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/md/dm-uevent.c | 75 +++++---------------------------------------------
drivers/md/dm-uevent.h | 30 ++++++++++++++++----
drivers/md/dm.c | 1 +
4 files changed, 103 insertions(+), 74 deletions(-)
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index ac734e5..c563b6d 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -30,6 +30,15 @@
#define DM_PG_INIT_DELAY_MSECS 2000
#define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1)
+static const struct {
+ enum dm_uevent_type type;
+ enum kobject_action action;
+ char *name;
+} _dm_mpath_uevent_type_names[] = {
+ {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
+ {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
+};
+
/* Path properties */
struct pgpath {
struct list_head list;
@@ -1232,6 +1241,68 @@ static void multipath_dtr(struct dm_target *ti)
free_multipath(m);
}
+static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
+ struct dm_target *ti,
+ enum kobject_action action,
+ const char *dm_action,
+ const char *path,
+ unsigned nr_valid_paths)
+{
+ struct dm_uevent *event;
+
+ event = dm_build_uevent(md, ti, action, dm_action);
+ if (IS_ERR(event))
+ return event;
+
+ if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
+ DMERR("%s: add_uevent_var() for DM_PATH failed", __func__);
+ goto err_add;
+ }
+
+ if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
+ nr_valid_paths)) {
+ DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
+ __func__);
+ goto err_add;
+ }
+
+ return event;
+
+err_add:
+ dm_uevent_free(event);
+ return ERR_PTR(-ENOMEM);
+}
+
+/**
+ * dm_path_uevent - called to create a new path event and queue it
+ *
+ * @event_type: path event type enum
+ * @ti: pointer to a dm_target
+ * @path: string containing pathname
+ * @nr_valid_paths: number of valid paths remaining
+ *
+ */
+static void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
+ const char *path, unsigned nr_valid_paths)
+{
+ struct mapped_device *md = dm_table_get_md(ti->table);
+ struct dm_uevent *event;
+
+ if (event_type >= ARRAY_SIZE(_dm_mpath_uevent_type_names)) {
+ DMERR("%s: Invalid event_type %d", __func__, event_type);
+ return;
+ }
+
+ event = dm_build_path_uevent(md, ti,
+ _dm_mpath_uevent_type_names[event_type].action,
+ _dm_mpath_uevent_type_names[event_type].name,
+ path, nr_valid_paths);
+ if (IS_ERR(event))
+ return;
+
+ dm_uevent_add(md, &event->elist);
+}
+
/*
* Take a path out of use.
*/
diff --git a/drivers/md/dm-uevent.c b/drivers/md/dm-uevent.c
index 2d5f858..f7089dd 100644
--- a/drivers/md/dm-uevent.c
+++ b/drivers/md/dm-uevent.c
@@ -29,30 +29,13 @@
#define DM_MSG_PREFIX "uevent"
-static const struct {
- enum dm_uevent_type type;
- enum kobject_action action;
- char *name;
-} _dm_uevent_type_names[] = {
- {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
- {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
-};
-
static struct kmem_cache *_dm_event_cache;
-struct dm_uevent {
- struct mapped_device *md;
- enum kobject_action action;
- struct kobj_uevent_env ku_env;
- struct list_head elist;
- char name[DM_NAME_LEN];
- char uuid[DM_UUID_LEN];
-};
-
-static void dm_uevent_free(struct dm_uevent *event)
+void dm_uevent_free(struct dm_uevent *event)
{
kmem_cache_free(_dm_event_cache, event);
}
+EXPORT_SYMBOL_GPL(dm_uevent_free);
static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
{
@@ -68,12 +51,10 @@ static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
return event;
}
-static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
- struct dm_target *ti,
- enum kobject_action action,
- const char *dm_action,
- const char *path,
- unsigned nr_valid_paths)
+struct dm_uevent *dm_build_uevent(struct mapped_device *md,
+ struct dm_target *ti,
+ enum kobject_action action,
+ const char *dm_action)
{
struct dm_uevent *event;
@@ -104,18 +85,6 @@ static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
goto err_add;
}
- if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
- DMERR("%s: add_uevent_var() for DM_PATH failed", __func__);
- goto err_add;
- }
-
- if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
- nr_valid_paths)) {
- DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
- __func__);
- goto err_add;
- }
-
return event;
err_add:
@@ -123,6 +92,7 @@ err_add:
err_nomem:
return ERR_PTR(-ENOMEM);
}
+EXPORT_SYMBOL_GPL(dm_build_uevent);
/**
* dm_send_uevents - send uevents for given list
@@ -170,37 +140,6 @@ uevent_free:
}
}
-/**
- * dm_path_uevent - called to create a new path event and queue it
- *
- * @event_type: path event type enum
- * @ti: pointer to a dm_target
- * @path: string containing pathname
- * @nr_valid_paths: number of valid paths remaining
- *
- */
-void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
- const char *path, unsigned nr_valid_paths)
-{
- struct mapped_device *md = dm_table_get_md(ti->table);
- struct dm_uevent *event;
-
- if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) {
- DMERR("%s: Invalid event_type %d", __func__, event_type);
- return;
- }
-
- event = dm_build_path_uevent(md, ti,
- _dm_uevent_type_names[event_type].action,
- _dm_uevent_type_names[event_type].name,
- path, nr_valid_paths);
- if (IS_ERR(event))
- return;
-
- dm_uevent_add(md, &event->elist);
-}
-EXPORT_SYMBOL_GPL(dm_path_uevent);
-
int dm_uevent_init(void)
{
_dm_event_cache = KMEM_CACHE(dm_uevent, 0);
diff --git a/drivers/md/dm-uevent.h b/drivers/md/dm-uevent.h
index 2eccc8b..4ff2ad1 100644
--- a/drivers/md/dm-uevent.h
+++ b/drivers/md/dm-uevent.h
@@ -21,6 +21,17 @@
#ifndef DM_UEVENT_H
#define DM_UEVENT_H
+#include <linux/dm-ioctl.h> // for DM_*_LEN
+
+struct dm_uevent {
+ struct mapped_device *md;
+ enum kobject_action action;
+ struct kobj_uevent_env ku_env;
+ struct list_head elist;
+ char name[DM_NAME_LEN];
+ char uuid[DM_UUID_LEN];
+};
+
enum dm_uevent_type {
DM_UEVENT_PATH_FAILED,
DM_UEVENT_PATH_REINSTATED,
@@ -31,9 +42,11 @@ enum dm_uevent_type {
extern int dm_uevent_init(void);
extern void dm_uevent_exit(void);
extern void dm_send_uevents(struct list_head *events, struct kobject *kobj);
-extern void dm_path_uevent(enum dm_uevent_type event_type,
- struct dm_target *ti, const char *path,
- unsigned nr_valid_paths);
+struct dm_uevent *dm_build_uevent(struct mapped_device *md,
+ struct dm_target *ti,
+ enum kobject_action action,
+ const char *dm_action);
+void dm_uevent_free(struct dm_uevent *event);
#else
@@ -48,9 +61,14 @@ static inline void dm_send_uevents(struct list_head *events,
struct kobject *kobj)
{
}
-static inline void dm_path_uevent(enum dm_uevent_type event_type,
- struct dm_target *ti, const char *path,
- unsigned nr_valid_paths)
+static inline struct dm_uevent *dm_build_uevent(struct mapped_device *md,
+ struct dm_target *ti,
+ enum kobject_action action,
+ const char *dm_action)
+{
+ return ERR_PTR(-ENOMEM);
+}
+static void dm_uevent_free(struct dm_uevent *event)
{
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index fa9b1cb..701c75f 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2427,6 +2427,7 @@ void dm_uevent_add(struct mapped_device *md, struct list_head *elist)
list_add(elist, &md->uevent_list);
spin_unlock_irqrestore(&md->uevent_lock, flags);
}
+EXPORT_SYMBOL_GPL(dm_uevent_add);
/*
* The gendisk is only valid as long as you have a reference
--
2.7.4
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