TOMOYO: Replace rw_semaphore by mutex.
Since readers no longer use down_read(), writers no longer
need to use rw_semaphore. Replace individual rw_semaphore by
single mutex.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 3c47286..5d1689d 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -167,9 +167,6 @@
return NULL;
}
-/* Lock for domain->acl_info_list. */
-DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock);
-
static int tomoyo_update_double_path_acl(const u8 type, const char *filename1,
const char *filename2,
struct tomoyo_domain_info *
@@ -204,7 +201,6 @@
* belongs to.
*/
static LIST_HEAD(tomoyo_globally_readable_list);
-static DECLARE_RWSEM(tomoyo_globally_readable_list_lock);
/**
* tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list.
@@ -229,7 +225,7 @@
saved_filename = tomoyo_save_name(filename);
if (!saved_filename)
return -ENOMEM;
- down_write(&tomoyo_globally_readable_list_lock);
+ mutex_lock(&tomoyo_policy_lock);
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
if (ptr->filename != saved_filename)
continue;
@@ -248,7 +244,7 @@
list_add_tail_rcu(&new_entry->list, &tomoyo_globally_readable_list);
error = 0;
out:
- up_write(&tomoyo_globally_readable_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
return error;
}
@@ -352,7 +348,6 @@
* current process from accessing other process's information.
*/
static LIST_HEAD(tomoyo_pattern_list);
-static DECLARE_RWSEM(tomoyo_pattern_list_lock);
/**
* tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list.
@@ -377,7 +372,7 @@
saved_pattern = tomoyo_save_name(pattern);
if (!saved_pattern)
return -ENOMEM;
- down_write(&tomoyo_pattern_list_lock);
+ mutex_lock(&tomoyo_policy_lock);
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (saved_pattern != ptr->pattern)
continue;
@@ -396,7 +391,7 @@
list_add_tail_rcu(&new_entry->list, &tomoyo_pattern_list);
error = 0;
out:
- up_write(&tomoyo_pattern_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
return error;
}
@@ -505,7 +500,6 @@
* need to worry whether the file is already unlink()ed or not.
*/
static LIST_HEAD(tomoyo_no_rewrite_list);
-static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock);
/**
* tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list.
@@ -529,7 +523,7 @@
saved_pattern = tomoyo_save_name(pattern);
if (!saved_pattern)
return -ENOMEM;
- down_write(&tomoyo_no_rewrite_list_lock);
+ mutex_lock(&tomoyo_policy_lock);
list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
if (ptr->pattern != saved_pattern)
continue;
@@ -548,7 +542,7 @@
list_add_tail_rcu(&new_entry->list, &tomoyo_no_rewrite_list);
error = 0;
out:
- up_write(&tomoyo_no_rewrite_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
return error;
}
@@ -881,7 +875,7 @@
saved_filename = tomoyo_save_name(filename);
if (!saved_filename)
return -ENOMEM;
- down_write(&tomoyo_domain_acl_info_list_lock);
+ mutex_lock(&tomoyo_policy_lock);
if (is_delete)
goto delete;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -943,7 +937,7 @@
break;
}
out:
- up_write(&tomoyo_domain_acl_info_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
return error;
}
@@ -981,7 +975,7 @@
saved_filename2 = tomoyo_save_name(filename2);
if (!saved_filename1 || !saved_filename2)
return -ENOMEM;
- down_write(&tomoyo_domain_acl_info_list_lock);
+ mutex_lock(&tomoyo_policy_lock);
if (is_delete)
goto delete;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -1027,7 +1021,7 @@
break;
}
out:
- up_write(&tomoyo_domain_acl_info_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
return error;
}