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-rw-r--r--fs/notify/fsnotify.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index b41515d3f081..eae621a18ac9 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -193,6 +193,7 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
struct hlist_node *inode_node = NULL, *vfsmount_node = NULL;
struct fsnotify_mark *inode_mark = NULL, *vfsmount_mark = NULL;
struct fsnotify_group *inode_group, *vfsmount_group;
+ struct fsnotify_mark_connector *inode_conn, *vfsmount_conn;
struct mount *mnt;
int idx, ret = 0;
/* global tests shouldn't care about events on child only the specific event */
@@ -210,8 +211,8 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
* SRCU because we have no references to any objects and do not
* need SRCU to keep them "alive".
*/
- if (hlist_empty(&to_tell->i_fsnotify_marks) &&
- (!mnt || hlist_empty(&mnt->mnt_fsnotify_marks)))
+ if (!to_tell->i_fsnotify_marks &&
+ (!mnt || !mnt->mnt_fsnotify_marks))
return 0;
/*
* if this is a modify event we may need to clear the ignored masks
@@ -226,16 +227,24 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
idx = srcu_read_lock(&fsnotify_mark_srcu);
if ((mask & FS_MODIFY) ||
- (test_mask & to_tell->i_fsnotify_mask))
- inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
- &fsnotify_mark_srcu);
+ (test_mask & to_tell->i_fsnotify_mask)) {
+ inode_conn = lockless_dereference(to_tell->i_fsnotify_marks);
+ if (inode_conn)
+ inode_node = srcu_dereference(inode_conn->list.first,
+ &fsnotify_mark_srcu);
+ }
if (mnt && ((mask & FS_MODIFY) ||
(test_mask & mnt->mnt_fsnotify_mask))) {
- vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
- &fsnotify_mark_srcu);
- inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
- &fsnotify_mark_srcu);
+ inode_conn = lockless_dereference(to_tell->i_fsnotify_marks);
+ if (inode_conn)
+ inode_node = srcu_dereference(inode_conn->list.first,
+ &fsnotify_mark_srcu);
+ vfsmount_conn = lockless_dereference(mnt->mnt_fsnotify_marks);
+ if (vfsmount_conn)
+ vfsmount_node = srcu_dereference(
+ vfsmount_conn->list.first,
+ &fsnotify_mark_srcu);
}
/*
@@ -293,6 +302,8 @@ out:
}
EXPORT_SYMBOL_GPL(fsnotify);
+extern struct kmem_cache *fsnotify_mark_connector_cachep;
+
static __init int fsnotify_init(void)
{
int ret;
@@ -303,6 +314,9 @@ static __init int fsnotify_init(void)
if (ret)
panic("initializing fsnotify_mark_srcu");
+ fsnotify_mark_connector_cachep = KMEM_CACHE(fsnotify_mark_connector,
+ SLAB_PANIC);
+
return 0;
}
core_initcall(fsnotify_init);