aufs: unnecessary proc_mounts.patch for linux-v5.8 and later

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

proc_mounts.patch

-SPDX-License-Identifier: GPL-2.0
-
-diff --git a/fs/mount.h b/fs/mount.h
-index 711a4093e475..a5703d5c7205 100644
---- a/fs/mount.h
-+++ b/fs/mount.h
-@@ -133,9 +133,7 @@ struct proc_mounts {
- 	struct mnt_namespace *ns;
- 	struct path root;
- 	int (*show)(struct seq_file *, struct vfsmount *);
--	void *cached_mount;
--	u64 cached_event;
--	loff_t cached_index;
-+	size_t filled;
- };
- 
- extern const struct seq_operations mounts_op;
-diff --git a/fs/namespace.c b/fs/namespace.c
-index a28e4db075ed..14fdd03edd0a 100644
---- a/fs/namespace.c
-+++ b/fs/namespace.c
-@@ -1246,46 +1246,80 @@ struct vfsmount *mnt_clone_internal(const struct path *path)
- 
- #ifdef CONFIG_PROC_FS
- /* iterator; we want it to have access to namespace_sem, thus here... */
--static void *m_start(struct seq_file *m, loff_t *pos)
-+static int m_start_fill(struct seq_file *m)
- {
-+	int err;
-+	size_t last_count;
-+	char *buf;
-+	struct mount *r;
- 	struct proc_mounts *p = m->private;
- 
-+	err = -ENODATA;
-+	m->count = 0;
- 	down_read(&namespace_sem);
--	if (p->cached_event == p->ns->event) {
--		void *v = p->cached_mount;
--		if (*pos == p->cached_index)
--			return v;
--		if (*pos == p->cached_index + 1) {
--			v = seq_list_next(v, &p->ns->list, &p->cached_index);
--			return p->cached_mount = v;
-+	list_for_each_entry(r, &p->ns->list, mnt_list) {
-+		last_count = m->count;
-+		err = p->show(m, &r->mnt);
-+		if (unlikely(err < 0))
-+			break;
-+		if (!seq_has_overflowed(m))
-+			continue;
-+
-+		/* expand the buffer */
-+		buf = kvmalloc(m->size + PAGE_SIZE, GFP_KERNEL);
-+		if (unlikely(!buf)) {
-+			err = -ENOMEM;
-+			break;
-+		}
-+		memcpy(buf, m->buf, last_count);
-+		kvfree(m->buf);
-+		m->buf = buf;
-+		m->size += PAGE_SIZE;
-+		m->count = last_count;
-+
-+#if 0 /* todo: consider the limit */
-+		err = p->show(m, &r->mnt);
-+		if (unlikely(err < 0))
-+			break;
-+		else if (unlikely(seq_has_overflowed(m))) {
-+			err = -EOVERFLOW;
-+			break;
- 		}
-+#endif
- 	}
-+	up_read(&namespace_sem);
- 
--	p->cached_event = p->ns->event;
--	p->cached_mount = seq_list_start(&p->ns->list, *pos);
--	p->cached_index = *pos;
--	return p->cached_mount;
-+	if (!err)
-+		p->filled = m->count;
-+	return err;
- }
- 
--static void *m_next(struct seq_file *m, void *v, loff_t *pos)
-+static void *m_start(struct seq_file *m, loff_t *pos)
- {
--	struct proc_mounts *p = m->private;
-+	int err;
- 
--	p->cached_mount = seq_list_next(v, &p->ns->list, pos);
--	p->cached_index = *pos;
--	return p->cached_mount;
-+	if (!*pos) {
-+		err = m_start_fill(m);
-+		if (unlikely(err))
-+			return ERR_PTR(err);
-+	}
-+
-+	return m_start; /* any valid pointer */
-+}
-+
-+static void *m_next(struct seq_file *m, void *v, loff_t *pos)
-+{
-+	return NULL;
- }
- 
- static void m_stop(struct seq_file *m, void *v)
- {
--	up_read(&namespace_sem);
-+	/* empty */
- }
- 
- static int m_show(struct seq_file *m, void *v)
- {
--	struct proc_mounts *p = m->private;
--	struct mount *r = list_entry(v, struct mount, mnt_list);
--	return p->show(m, &r->mnt);
-+	return 0;
- }
- 
- const struct seq_operations mounts_op = {
-diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
-index 273ee82d8aa9..e5b22c50ca59 100644
---- a/fs/proc_namespace.c
-+++ b/fs/proc_namespace.c
-@@ -279,7 +279,6 @@ static int mounts_open_common(struct inode *inode, struct file *file,
- 	p->ns = ns;
- 	p->root = root;
- 	p->show = show;
--	p->cached_event = ~0ULL;
- 
- 	return 0;
-