dm log: auto load modules
If the log type is not recognised, attempt to load the module 'dm-log-<type>.ko'. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
parent
304f3f6a58
commit
fb8b284806
|
@ -41,7 +41,7 @@ int dm_unregister_dirty_log_type(struct dirty_log_type *type)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static struct dirty_log_type *get_type(const char *type_name)
|
||||
static struct dirty_log_type *_get_type(const char *type_name)
|
||||
{
|
||||
struct dirty_log_type *type;
|
||||
|
||||
|
@ -61,6 +61,55 @@ static struct dirty_log_type *get_type(const char *type_name)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* get_type
|
||||
* @type_name
|
||||
*
|
||||
* Attempt to retrieve the dirty_log_type by name. If not already
|
||||
* available, attempt to load the appropriate module.
|
||||
*
|
||||
* Log modules are named "dm-log-" followed by the 'type_name'.
|
||||
* Modules may contain multiple types.
|
||||
* This function will first try the module "dm-log-<type_name>",
|
||||
* then truncate 'type_name' on the last '-' and try again.
|
||||
*
|
||||
* For example, if type_name was "clustered-disk", it would search
|
||||
* 'dm-log-clustered-disk' then 'dm-log-clustered'.
|
||||
*
|
||||
* Returns: dirty_log_type* on success, NULL on failure
|
||||
*/
|
||||
static struct dirty_log_type *get_type(const char *type_name)
|
||||
{
|
||||
char *p, *type_name_dup;
|
||||
struct dirty_log_type *type;
|
||||
|
||||
type = _get_type(type_name);
|
||||
if (type)
|
||||
return type;
|
||||
|
||||
type_name_dup = kstrdup(type_name, GFP_KERNEL);
|
||||
if (!type_name_dup) {
|
||||
DMWARN("No memory left to attempt log module load for \"%s\"",
|
||||
type_name);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
while (request_module("dm-log-%s", type_name_dup) ||
|
||||
!(type = _get_type(type_name))) {
|
||||
p = strrchr(type_name_dup, '-');
|
||||
if (!p)
|
||||
break;
|
||||
p[0] = '\0';
|
||||
}
|
||||
|
||||
if (!type)
|
||||
DMWARN("Module for logging type \"%s\" not found.", type_name);
|
||||
|
||||
kfree(type_name_dup);
|
||||
|
||||
return type;
|
||||
}
|
||||
|
||||
static void put_type(struct dirty_log_type *type)
|
||||
{
|
||||
spin_lock(&_lock);
|
||||
|
|
Loading…
Reference in a new issue