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authorPeter Rajnoha <prajnoha@redhat.com>2010-03-06 05:32:31 +0300
committerAlasdair G Kergon <agk@redhat.com>2010-03-06 05:32:31 +0300
commit3abf85b5b5851b5f28d3d8a920ebb844edd08352 (patch)
treeb59e5c9322cc116b0ce5dc183d3b8286080c6031 /drivers/md
parenta97f925a32aad2a37971d7bfb657006acf04e42d (diff)
downloadlinux-3abf85b5b5851b5f28d3d8a920ebb844edd08352.tar.xz
dm ioctl: introduce flag indicating uevent was generated
Set a new DM_UEVENT_GENERATED_FLAG when returning from ioctls to indicate that a uevent was actually generated. This tells the userspace caller that it may need to wait for the event to be processed. Signed-off-by: Peter Rajnoha <prajnoha@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-ioctl.c19
-rw-r--r--drivers/md/dm.c7
-rw-r--r--drivers/md/dm.h4
3 files changed, 18 insertions, 12 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index e3cf5686d0aa..d7500e1c26f2 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -285,7 +285,8 @@ retry:
up_write(&_hash_lock);
}
-static int dm_hash_rename(uint32_t cookie, const char *old, const char *new)
+static int dm_hash_rename(uint32_t cookie, uint32_t *flags, const char *old,
+ const char *new)
{
char *new_name, *old_name;
struct hash_cell *hc;
@@ -344,7 +345,8 @@ static int dm_hash_rename(uint32_t cookie, const char *old, const char *new)
dm_table_put(table);
}
- dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie);
+ if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie))
+ *flags |= DM_UEVENT_GENERATED_FLAG;
dm_put(hc->md);
up_write(&_hash_lock);
@@ -736,10 +738,10 @@ static int dev_remove(struct dm_ioctl *param, size_t param_size)
__hash_remove(hc);
up_write(&_hash_lock);
- dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr);
+ if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr))
+ param->flags |= DM_UEVENT_GENERATED_FLAG;
dm_put(md);
- param->data_size = 0;
return 0;
}
@@ -773,7 +775,9 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
return r;
param->data_size = 0;
- return dm_hash_rename(param->event_nr, param->name, new_name);
+
+ return dm_hash_rename(param->event_nr, &param->flags, param->name,
+ new_name);
}
static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
@@ -899,8 +903,8 @@ static int do_resume(struct dm_ioctl *param)
if (dm_suspended_md(md)) {
r = dm_resume(md);
- if (!r)
- dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr);
+ if (!r && !dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr))
+ param->flags |= DM_UEVENT_GENERATED_FLAG;
}
if (old_map)
@@ -1477,6 +1481,7 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
{
/* Always clear this flag */
param->flags &= ~DM_BUFFER_FULL_FLAG;
+ param->flags &= ~DM_UEVENT_GENERATED_FLAG;
/* Ignores parameters */
if (cmd == DM_REMOVE_ALL_CMD ||
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 7199846364e9..d21e1284604f 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2618,18 +2618,19 @@ out:
/*-----------------------------------------------------------------
* Event notification.
*---------------------------------------------------------------*/
-void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
+int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
unsigned cookie)
{
char udev_cookie[DM_COOKIE_LENGTH];
char *envp[] = { udev_cookie, NULL };
if (!cookie)
- kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
+ return kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
else {
snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u",
DM_COOKIE_ENV_VAR_NAME, cookie);
- kobject_uevent_env(&disk_to_dev(md->disk)->kobj, action, envp);
+ return kobject_uevent_env(&disk_to_dev(md->disk)->kobj,
+ action, envp);
}
}
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 8dadaa5bc396..bad1724d4869 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -125,8 +125,8 @@ void dm_stripe_exit(void);
int dm_open_count(struct mapped_device *md);
int dm_lock_for_deletion(struct mapped_device *md);
-void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
- unsigned cookie);
+int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
+ unsigned cookie);
int dm_io_init(void);
void dm_io_exit(void);