fsnotify: srcu to protect read side of inode and vfsmount locks
Currently reading the inode->i_fsnotify_marks or
vfsmount->mnt_fsnotify_marks lists are protected by a spinlock on both the
read and the write side. This patch protects the read side of those lists
with a new single srcu.
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 1be54f6..7eed86f 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -6,8 +6,6 @@
#include <linux/srcu.h>
#include <linux/types.h>
-/* protects reads of fsnotify_groups */
-extern struct srcu_struct fsnotify_grp_srcu;
/* all groups which receive inode fsnotify events */
extern struct list_head fsnotify_inode_groups;
/* all groups which receive vfsmount fsnotify events */
@@ -20,6 +18,9 @@
/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);
+/* protects reads of inode and vfsmount marks list */
+extern struct srcu_struct fsnotify_mark_srcu;
+
extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
__u32 mask);
/* add a mark to an inode */