fsnotify: use a mutex instead of a spinlock to protect a groups mark list

Replaces the groups mark_lock spinlock with a mutex. Using a mutex instead
of a spinlock results in more flexibility (i.e it allows to sleep while the
lock is held).

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 32447dc06c07..ab25b810b146 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -136,13 +136,13 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
         group = mark->group;
         spin_unlock(&mark->lock);
 
-        spin_lock(&group->mark_lock);
+        mutex_lock(&group->mark_mutex);
         spin_lock(&mark->lock);
 
         /* something else already called this function on this mark */
         if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE)) {
                 spin_unlock(&mark->lock);
-                spin_unlock(&group->mark_lock);
+                mutex_unlock(&group->mark_mutex);
                 goto put_group;
         }
 
@@ -159,7 +159,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
         list_del_init(&mark->g_list);
 
         spin_unlock(&mark->lock);
-        spin_unlock(&group->mark_lock);
+        mutex_unlock(&group->mark_mutex);
 
         spin_lock(&destroy_lock);
         list_add(&mark->destroy_list, &destroy_list);
@@ -232,11 +232,11 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
 
         /*
          * LOCKING ORDER!!!!
-         * group->mark_lock
+         * group->mark_mutex
          * mark->lock
          * inode->i_lock
          */
-        spin_lock(&group->mark_lock);
+        mutex_lock(&group->mark_mutex);
 
         spin_lock(&mark->lock);
         mark->flags |= FSNOTIFY_MARK_FLAG_ALIVE;
@@ -263,7 +263,7 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
         fsnotify_set_mark_mask_locked(mark, mark->mask);
         spin_unlock(&mark->lock);
 
-        spin_unlock(&group->mark_lock);
+        mutex_unlock(&group->mark_mutex);
 
         if (inode)
                 __fsnotify_update_child_dentry_flags(inode);
@@ -277,7 +277,7 @@ err:
         atomic_dec(&group->num_marks);
 
         spin_unlock(&mark->lock);
-        spin_unlock(&group->mark_lock);
+        mutex_unlock(&group->mark_mutex);
 
         spin_lock(&destroy_lock);
         list_add(&mark->destroy_list, &destroy_list);
@@ -296,7 +296,7 @@ void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group,
         struct fsnotify_mark *lmark, *mark;
         LIST_HEAD(free_list);
 
-        spin_lock(&group->mark_lock);
+        mutex_lock(&group->mark_mutex);
         list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) {
                 if (mark->flags & flags) {
                         list_add(&mark->free_g_list, &free_list);
@@ -304,7 +304,7 @@ void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group,
                         fsnotify_get_mark(mark);
                 }
         }
-        spin_unlock(&group->mark_lock);
+        mutex_unlock(&group->mark_mutex);
 
         list_for_each_entry_safe(mark, lmark, &free_list, free_g_list) {
                 fsnotify_destroy_mark(mark);