[PATCH v2] inotify, memcg: account inotify instances to kmemcg

[Shakeel Butt]

Currently the fs sysctl inotify/max_user_instances is used to limit the
number of inotify instances on the system. For systems running multiple
workloads, the per-user namespace sysctl max_inotify_instances can be
used to further partition inotify instances. However there is no easy
way to set a sensible system level max limit on inotify instances and
further partition it between the workloads. It is much easier to charge
the underlying resource (i.e. memory) behind the inotify instances to
the memcg of the workload and let their memory limits limit the number
of inotify instances they can create.

With inotify instances charged to memcg, the admin can simply set
max_user_instances to INT_MAX and let the memcg limits of the jobs limit
their inotify instances.

Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
---
Changes since v1:
- introduce fsnotify_alloc_user_group() and convert fanotify in addition
  to inotify to use that function. [suggested by Amir]

 fs/notify/fanotify/fanotify_user.c |  2 +-
 fs/notify/group.c                  | 25 ++++++++++++++++++++-----
 fs/notify/inotify/inotify_user.c   |  4 ++--
 include/linux/fsnotify_backend.h   |  1 +
 4 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 3e01d8f2ab90..7e7afc2b62e1 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -976,7 +976,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
 		f_flags |= O_NONBLOCK;
 
 	/* fsnotify_alloc_group takes a ref.  Dropped in fanotify_release */
-	group = fsnotify_alloc_group(&fanotify_fsnotify_ops);
+	group = fsnotify_alloc_user_group(&fanotify_fsnotify_ops);
 	if (IS_ERR(group)) {
 		free_uid(user);
 		return PTR_ERR(group);
diff --git a/fs/notify/group.c b/fs/notify/group.c
index a4a4b1c64d32..ffd723ffe46d 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -111,14 +111,12 @@ void fsnotify_put_group(struct fsnotify_group *group)
 }
 EXPORT_SYMBOL_GPL(fsnotify_put_group);
 
-/*
- * Create a new fsnotify_group and hold a reference for the group returned.
- */
-struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
+static struct fsnotify_group *__fsnotify_alloc_group(
+				const struct fsnotify_ops *ops, gfp_t gfp)
 {
 	struct fsnotify_group *group;
 
-	group = kzalloc(sizeof(struct fsnotify_group), GFP_KERNEL);
+	group = kzalloc(sizeof(struct fsnotify_group), gfp);
 	if (!group)
 		return ERR_PTR(-ENOMEM);
 
@@ -139,8 +137,25 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
 
 	return group;
 }
+
+/*
+ * Create a new fsnotify_group and hold a reference for the group returned.
+ */
+struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
+{
+	return __fsnotify_alloc_group(ops, GFP_KERNEL);
+}
 EXPORT_SYMBOL_GPL(fsnotify_alloc_group);
 
+/*
+ * Create a new fsnotify_group and hold a reference for the group returned.
+ */
+struct fsnotify_group *fsnotify_alloc_user_group(const struct fsnotify_ops *ops)
+{
+	return __fsnotify_alloc_group(ops, GFP_KERNEL_ACCOUNT);
+}
+EXPORT_SYMBOL_GPL(fsnotify_alloc_user_group);
+
 int fsnotify_fasync(int fd, struct file *file, int on)
 {
 	struct fsnotify_group *group = file->private_data;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 59c177011a0f..266d17e8ecb9 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -632,11 +632,11 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events)
 	struct fsnotify_group *group;
 	struct inotify_event_info *oevent;
 
-	group = fsnotify_alloc_group(&inotify_fsnotify_ops);
+	group = fsnotify_alloc_user_group(&inotify_fsnotify_ops);
 	if (IS_ERR(group))
 		return group;
 
-	oevent = kmalloc(sizeof(struct inotify_event_info), GFP_KERNEL);
+	oevent = kmalloc(sizeof(struct inotify_event_info), GFP_KERNEL_ACCOUNT);
 	if (unlikely(!oevent)) {
 		fsnotify_destroy_group(group);
 		return ERR_PTR(-ENOMEM);
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index a2e42d3cd87c..e5409b83e731 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -470,6 +470,7 @@ static inline void fsnotify_update_flags(struct dentry *dentry)
 
 /* create a new group */
 extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
+extern struct fsnotify_group *fsnotify_alloc_user_group(const struct fsnotify_ops *ops);
 /* get reference to a group */
 extern void fsnotify_get_group(struct fsnotify_group *group);
 /* drop reference on a group from fsnotify_alloc_group */
-- 
2.29.2.684.gfbc64c5ab5-goog