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>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 8e24cdf72928..84159390969f 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -302,6 +302,7 @@ struct fsnotify_mark {
 #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY  0x08
 #define FSNOTIFY_MARK_FLAG_ALIVE                0x10
         unsigned int flags;             /* vfsmount or inode mark? */
+        struct list_head destroy_list;
         void (*free_mark)(struct fsnotify_mark *mark); /* called on final put+free */
 };