5.11 20210222

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

aufs5-base.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 base patch
+
+diff --git a/MAINTAINERS b/MAINTAINERS
+index bfc1b86e3e733..cf773a5624338 100644
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -3017,6 +3017,19 @@ F:	include/linux/audit.h
+ F:	include/uapi/linux/audit.h
+ F:	kernel/audit*
+ 
++AUFS (advanced multi layered unification filesystem) FILESYSTEM
++M:	"J. R. Okajima" <hooanon05g@gmail.com>
++L:	aufs-users@lists.sourceforge.net (members only)
++L:	linux-unionfs@vger.kernel.org
++S:	Supported
++W:	http://aufs.sourceforge.net
++T:	git://github.com/sfjro/aufs4-linux.git
++F:	Documentation/ABI/testing/debugfs-aufs
++F:	Documentation/ABI/testing/sysfs-aufs
++F:	Documentation/filesystems/aufs/
++F:	fs/aufs/
++F:	include/uapi/linux/aufs_type.h
++
+ AUXILIARY DISPLAY DRIVERS
+ M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
+ S:	Maintained
+diff --git a/drivers/block/loop.c b/drivers/block/loop.c
+index e5ff328f09175..39d539df0349d 100644
+--- a/drivers/block/loop.c
++++ b/drivers/block/loop.c
+@@ -761,6 +761,24 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 	return error;
+ }
+ 
++/*
++ * for AUFS
++ * no get/put for file.
++ */
++struct file *loop_backing_file(struct super_block *sb)
++{
++	struct file *ret;
++	struct loop_device *l;
++
++	ret = NULL;
++	if (MAJOR(sb->s_dev) == LOOP_MAJOR) {
++		l = sb->s_bdev->bd_disk->private_data;
++		ret = l->lo_backing_file;
++	}
++	return ret;
++}
++EXPORT_SYMBOL_GPL(loop_backing_file);
++
+ /* loop sysfs attributes */
+ 
+ static ssize_t loop_attr_show(struct device *dev, char *page,
+diff --git a/fs/dcache.c b/fs/dcache.c
+index 97e81a844a966..a7522ebbca659 100644
+--- a/fs/dcache.c
++++ b/fs/dcache.c
+@@ -1292,7 +1292,7 @@ enum d_walk_ret {
+  *
+  * The @enter() callbacks are called with d_lock held.
+  */
+-static void d_walk(struct dentry *parent, void *data,
++void d_walk(struct dentry *parent, void *data,
+ 		   enum d_walk_ret (*enter)(void *, struct dentry *))
+ {
+ 	struct dentry *this_parent;
+diff --git a/fs/fcntl.c b/fs/fcntl.c
+index 05b36b28f2e87..e747a47a97da4 100644
+--- a/fs/fcntl.c
++++ b/fs/fcntl.c
+@@ -32,7 +32,7 @@
+ 
+ #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
+ 
+-static int setfl(int fd, struct file * filp, unsigned long arg)
++int setfl(int fd, struct file *filp, unsigned long arg)
+ {
+ 	struct inode * inode = file_inode(filp);
+ 	int error = 0;
+@@ -63,6 +63,8 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
+ 
+ 	if (filp->f_op->check_flags)
+ 		error = filp->f_op->check_flags(arg);
++	if (!error && filp->f_op->setfl)
++		error = filp->f_op->setfl(filp, arg);
+ 	if (error)
+ 		return error;
+ 
+diff --git a/fs/inode.c b/fs/inode.c
+index 6442d97d9a4ab..e4a25c3fa9e55 100644
+--- a/fs/inode.c
++++ b/fs/inode.c
+@@ -1769,7 +1769,7 @@ EXPORT_SYMBOL(generic_update_time);
+  * This does the actual work of updating an inodes time or version.  Must have
+  * had called mnt_want_write() before calling this.
+  */
+-static int update_time(struct inode *inode, struct timespec64 *time, int flags)
++int update_time(struct inode *inode, struct timespec64 *time, int flags)
+ {
+ 	if (inode->i_op->update_time)
+ 		return inode->i_op->update_time(inode, time, flags);
+diff --git a/fs/namespace.c b/fs/namespace.c
+index 9d33909d0f9e3..3e16fc64df8b8 100644
+--- a/fs/namespace.c
++++ b/fs/namespace.c
+@@ -792,6 +792,12 @@ static inline int check_mnt(struct mount *mnt)
+ 	return mnt->mnt_ns == current->nsproxy->mnt_ns;
+ }
+ 
++/* for aufs, CONFIG_AUFS_BR_FUSE */
++int is_current_mnt_ns(struct vfsmount *mnt)
++{
++	return check_mnt(real_mount(mnt));
++}
++
+ /*
+  * vfsmount lock must be held for write
+  */
+diff --git a/fs/splice.c b/fs/splice.c
+index 866d5c2367b23..55b5356262085 100644
+--- a/fs/splice.c
++++ b/fs/splice.c
+@@ -756,8 +756,8 @@ static int warn_unsupported(struct file *file, const char *op)
+ /*
+  * Attempt to initiate a splice from pipe to file.
+  */
+-static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+-			   loff_t *ppos, size_t len, unsigned int flags)
++long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
++		    loff_t *ppos, size_t len, unsigned int flags)
+ {
+ 	if (unlikely(!out->f_op->splice_write))
+ 		return warn_unsupported(out, "write");
+@@ -767,9 +767,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ /*
+  * Attempt to initiate a splice from a file to a pipe.
+  */
+-static long do_splice_to(struct file *in, loff_t *ppos,
+-			 struct pipe_inode_info *pipe, size_t len,
+-			 unsigned int flags)
++long do_splice_to(struct file *in, loff_t *ppos,
++		  struct pipe_inode_info *pipe, size_t len,
++		  unsigned int flags)
+ {
+ 	int ret;
+ 
+diff --git a/fs/sync.c b/fs/sync.c
+index 1373a610dc784..b7b5a0a0df6ff 100644
+--- a/fs/sync.c
++++ b/fs/sync.c
+@@ -28,7 +28,7 @@
+  * wait == 1 case since in that case write_inode() functions do
+  * sync_dirty_buffer() and thus effectively write one block at a time.
+  */
+-static int __sync_filesystem(struct super_block *sb, int wait)
++int __sync_filesystem(struct super_block *sb, int wait)
+ {
+ 	if (wait)
+ 		sync_inodes_sb(sb);
+diff --git a/include/linux/fs.h b/include/linux/fs.h
+index fd47deea7c176..91f3fbe5b57ff 100644
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -1330,6 +1330,7 @@ extern void fasync_free(struct fasync_struct *);
+ /* can be called from interrupts */
+ extern void kill_fasync(struct fasync_struct **, int, int);
+ 
++extern int setfl(int fd, struct file *filp, unsigned long arg);
+ extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
+ extern int f_setown(struct file *filp, unsigned long arg, int force);
+ extern void f_delown(struct file *filp);
+@@ -1841,6 +1842,7 @@ struct file_operations {
+ 	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
+ 	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+ 	int (*check_flags)(int);
++	int (*setfl)(struct file *, unsigned long);
+ 	int (*flock) (struct file *, int, struct file_lock *);
+ 	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
+ 	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
+@@ -2326,6 +2328,7 @@ extern int current_umask(void);
+ extern void ihold(struct inode * inode);
+ extern void iput(struct inode *);
+ extern int generic_update_time(struct inode *, struct timespec64 *, int);
++extern int update_time(struct inode *, struct timespec64 *, int);
+ 
+ /* /sys/fs */
+ extern struct kobject *fs_kobj;
+@@ -2562,6 +2565,7 @@ static inline bool sb_is_blkdev_sb(struct super_block *sb)
+ }
+ 
+ void emergency_thaw_all(void);
++extern int __sync_filesystem(struct super_block *, int);
+ extern int sync_filesystem(struct super_block *);
+ extern const struct file_operations def_blk_fops;
+ extern const struct file_operations def_chr_fops;
+diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
+index b9e9adec73e8b..e152c49cc3163 100644
+--- a/include/linux/lockdep.h
++++ b/include/linux/lockdep.h
+@@ -241,6 +241,8 @@ static inline int lockdep_match_key(struct lockdep_map *lock,
+ 	return lock->key == key;
+ }
+ 
++struct lock_class *lockdep_hlock_class(struct held_lock *hlock);
++
+ /*
+  * Acquire a lock.
+  *
+diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h
+index 8f882f5881e87..6b9808f098435 100644
+--- a/include/linux/mnt_namespace.h
++++ b/include/linux/mnt_namespace.h
+@@ -7,12 +7,15 @@ struct mnt_namespace;
+ struct fs_struct;
+ struct user_namespace;
+ struct ns_common;
++struct vfsmount;
+ 
+ extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
+ 		struct user_namespace *, struct fs_struct *);
+ extern void put_mnt_ns(struct mnt_namespace *ns);
+ extern struct ns_common *from_mnt_ns(struct mnt_namespace *);
+ 
++extern int is_current_mnt_ns(struct vfsmount *mnt);
++
+ extern const struct file_operations proc_mounts_operations;
+ extern const struct file_operations proc_mountinfo_operations;
+ extern const struct file_operations proc_mountstats_operations;
+diff --git a/include/linux/splice.h b/include/linux/splice.h
+index a55179fd60fc3..8e21c53cf8831 100644
+--- a/include/linux/splice.h
++++ b/include/linux/splice.h
+@@ -93,4 +93,10 @@ extern void splice_shrink_spd(struct splice_pipe_desc *);
+ 
+ extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
+ extern const struct pipe_buf_operations default_pipe_buf_ops;
++
++extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
++			   loff_t *ppos, size_t len, unsigned int flags);
++extern long do_splice_to(struct file *in, loff_t *ppos,
++			 struct pipe_inode_info *pipe, size_t len,
++			 unsigned int flags);
+ #endif
+diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
+index bdaf4829098c0..5c3bff75de111 100644
+--- a/kernel/locking/lockdep.c
++++ b/kernel/locking/lockdep.c
+@@ -188,7 +188,7 @@ static
+ struct lock_class lock_classes[MAX_LOCKDEP_KEYS];
+ static DECLARE_BITMAP(lock_classes_in_use, MAX_LOCKDEP_KEYS);
+ 
+-static inline struct lock_class *hlock_class(struct held_lock *hlock)
++inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock)
+ {
+ 	unsigned int class_idx = hlock->class_idx;
+ 
+@@ -209,6 +209,7 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock)
+ 	 */
+ 	return lock_classes + class_idx;
+ }
++#define hlock_class(hlock) lockdep_hlock_class(hlock)
+ 
+ #ifdef CONFIG_LOCK_STAT
+ static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], cpu_lock_stats);

aufs5-kbuild.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 kbuild patch
+
+diff --git a/fs/Kconfig b/fs/Kconfig
+index da524c4d7b7e0..50ab89368c2b5 100644
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -288,6 +288,7 @@ source "fs/sysv/Kconfig"
+ source "fs/ufs/Kconfig"
+ source "fs/erofs/Kconfig"
+ source "fs/vboxsf/Kconfig"
++source "fs/aufs/Kconfig"
+ 
+ endif # MISC_FILESYSTEMS
+ 
+diff --git a/fs/Makefile b/fs/Makefile
+index 999d1a23f036c..0cd76857ca764 100644
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -136,3 +136,4 @@ obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
+ obj-$(CONFIG_EROFS_FS)		+= erofs/
+ obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
+ obj-$(CONFIG_ZONEFS_FS)		+= zonefs/
++obj-$(CONFIG_AUFS_FS)           += aufs/

aufs5-loopback.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 loopback patch
+
+diff --git a/drivers/block/loop.c b/drivers/block/loop.c
+index 39d539df0349d..4109efe2f6a3a 100644
+--- a/drivers/block/loop.c
++++ b/drivers/block/loop.c
+@@ -646,6 +646,15 @@ static inline void loop_update_dio(struct loop_device *lo)
+ 				lo->use_dio);
+ }
+ 
++static struct file *loop_real_file(struct file *file)
++{
++	struct file *f = NULL;
++
++	if (file->f_path.dentry->d_sb->s_op->real_loop)
++		f = file->f_path.dentry->d_sb->s_op->real_loop(file);
++	return f;
++}
++
+ static void loop_reread_partitions(struct loop_device *lo,
+ 				   struct block_device *bdev)
+ {
+@@ -701,6 +710,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 			  unsigned int arg)
+ {
+ 	struct file	*file = NULL, *old_file;
++	struct file	*f, *virt_file = NULL, *old_virt_file;
+ 	int		error;
+ 	bool		partscan;
+ 
+@@ -720,12 +730,19 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 	file = fget(arg);
+ 	if (!file)
+ 		goto out_err;
++	f = loop_real_file(file);
++	if (f) {
++		virt_file = file;
++		file = f;
++		get_file(file);
++	}
+ 
+ 	error = loop_validate_file(file, bdev);
+ 	if (error)
+ 		goto out_err;
+ 
+ 	old_file = lo->lo_backing_file;
++	old_virt_file = lo->lo_backing_virt_file;
+ 
+ 	error = -EINVAL;
+ 
+@@ -737,6 +754,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 	blk_mq_freeze_queue(lo->lo_queue);
+ 	mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask);
+ 	lo->lo_backing_file = file;
++	lo->lo_backing_virt_file = virt_file;
+ 	lo->old_gfp_mask = mapping_gfp_mask(file->f_mapping);
+ 	mapping_set_gfp_mask(file->f_mapping,
+ 			     lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
+@@ -750,6 +768,8 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 	 * dependency.
+ 	 */
+ 	fput(old_file);
++	if (old_virt_file)
++		fput(old_virt_file);
+ 	if (partscan)
+ 		loop_reread_partitions(lo, bdev);
+ 	return 0;
+@@ -758,6 +778,8 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
+ 	mutex_unlock(&loop_ctl_mutex);
+ 	if (file)
+ 		fput(file);
++	if (virt_file)
++		fput(virt_file);
+ 	return error;
+ }
+ 
+@@ -1084,7 +1106,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode,
+ 			  struct block_device *bdev,
+ 			  const struct loop_config *config)
+ {
+-	struct file	*file;
++	struct file	*file, *f, *virt_file = NULL;
+ 	struct inode	*inode;
+ 	struct address_space *mapping;
+ 	int		error;
+@@ -1099,6 +1121,12 @@ static int loop_configure(struct loop_device *lo, fmode_t mode,
+ 	file = fget(config->fd);
+ 	if (!file)
+ 		goto out;
++	f = loop_real_file(file);
++	if (f) {
++		virt_file = file;
++		file = f;
++		get_file(file);
++	}
+ 
+ 	/*
+ 	 * If we don't hold exclusive handle for the device, upgrade to it
+@@ -1153,6 +1181,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode,
+ 	lo->use_dio = lo->lo_flags & LO_FLAGS_DIRECT_IO;
+ 	lo->lo_device = bdev;
+ 	lo->lo_backing_file = file;
++	lo->lo_backing_virt_file = virt_file;
+ 	lo->old_gfp_mask = mapping_gfp_mask(mapping);
+ 	mapping_set_gfp_mask(mapping, lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
+ 
+@@ -1203,6 +1232,8 @@ static int loop_configure(struct loop_device *lo, fmode_t mode,
+ 		bd_abort_claiming(bdev, loop_configure);
+ out_putf:
+ 	fput(file);
++	if (virt_file)
++		fput(virt_file);
+ out:
+ 	/* This is safe: open() is still holding a reference. */
+ 	module_put(THIS_MODULE);
+@@ -1212,6 +1243,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode,
+ static int __loop_clr_fd(struct loop_device *lo, bool release)
+ {
+ 	struct file *filp = NULL;
++	struct file *virt_filp = lo->lo_backing_virt_file;
+ 	gfp_t gfp = lo->old_gfp_mask;
+ 	struct block_device *bdev = lo->lo_device;
+ 	int err = 0;
+@@ -1235,6 +1267,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
+ 
+ 	spin_lock_irq(&lo->lo_lock);
+ 	lo->lo_backing_file = NULL;
++	lo->lo_backing_virt_file = NULL;
+ 	spin_unlock_irq(&lo->lo_lock);
+ 
+ 	loop_release_xfer(lo);
+@@ -1317,6 +1350,8 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
+ 	 */
+ 	if (filp)
+ 		fput(filp);
++	if (virt_filp)
++		fput(virt_filp);
+ 	return err;
+ }
+ 
+diff --git a/drivers/block/loop.h b/drivers/block/loop.h
+index af75a5ee40944..1d847cb194ff6 100644
+--- a/drivers/block/loop.h
++++ b/drivers/block/loop.h
+@@ -46,7 +46,7 @@ struct loop_device {
+ 	int		(*ioctl)(struct loop_device *, int cmd, 
+ 				 unsigned long arg); 
+ 
+-	struct file *	lo_backing_file;
++	struct file	*lo_backing_file, *lo_backing_virt_file;
+ 	struct block_device *lo_device;
+ 	void		*key_data; 
+ 
+diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c
+index 5ef279a59bb14..6447c37f98756 100644
+--- a/fs/aufs/f_op.c
++++ b/fs/aufs/f_op.c
+@@ -304,7 +304,7 @@ static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter)
+ 	if (IS_ERR(h_file))
+ 		goto out;
+ 
+-	if (au_test_loopback_kthread()) {
++	if (0 && au_test_loopback_kthread()) {
+ 		au_warn_loopback(h_file->f_path.dentry->d_sb);
+ 		if (file->f_mapping != h_file->f_mapping) {
+ 			file->f_mapping = h_file->f_mapping;
+diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c
+index a8b63acc62045..9d97c3af5686a 100644
+--- a/fs/aufs/loop.c
++++ b/fs/aufs/loop.c
+@@ -133,3 +133,19 @@ void au_loopback_fin(void)
+ 		symbol_put(loop_backing_file);
+ 	au_kfree_try_rcu(au_warn_loopback_array);
+ }
++
++/* ---------------------------------------------------------------------- */
++
++/* support the loopback block device insude aufs */
++
++struct file *aufs_real_loop(struct file *file)
++{
++	struct file *f;
++
++	BUG_ON(!au_test_aufs(file->f_path.dentry->d_sb));
++	fi_read_lock(file);
++	f = au_hf_top(file);
++	fi_read_unlock(file);
++	AuDebugOn(!f);
++	return f;
++}
+diff --git a/fs/aufs/loop.h b/fs/aufs/loop.h
+index 94f4f80ae33bf..ca1194354aff4 100644
+--- a/fs/aufs/loop.h
++++ b/fs/aufs/loop.h
+@@ -26,6 +26,8 @@ void au_warn_loopback(struct super_block *h_sb);
+ 
+ int au_loopback_init(void);
+ void au_loopback_fin(void);
++
++struct file *aufs_real_loop(struct file *file);
+ #else
+ AuStub(struct file *, loop_backing_file, return NULL, struct super_block *sb)
+ 
+@@ -36,6 +38,8 @@ AuStubVoid(au_warn_loopback, struct super_block *h_sb)
+ 
+ AuStubInt0(au_loopback_init, void)
+ AuStubVoid(au_loopback_fin, void)
++
++AuStub(struct file *, aufs_real_loop, return NULL, struct file *file)
+ #endif /* BLK_DEV_LOOP */
+ 
+ #endif /* __KERNEL__ */
+diff --git a/fs/aufs/super.c b/fs/aufs/super.c
+index 589dd01220201..801e0a7faec59 100644
+--- a/fs/aufs/super.c
++++ b/fs/aufs/super.c
+@@ -844,7 +844,10 @@ static const struct super_operations aufs_sop = {
+ 	.statfs		= aufs_statfs,
+ 	.put_super	= aufs_put_super,
+ 	.sync_fs	= aufs_sync_fs,
+-	.remount_fs	= aufs_remount_fs
++	.remount_fs	= aufs_remount_fs,
++#ifdef CONFIG_AUFS_BDEV_LOOP
++	.real_loop	= aufs_real_loop
++#endif
+ };
+ 
+ /* ---------------------------------------------------------------------- */
+diff --git a/include/linux/fs.h b/include/linux/fs.h
+index 91f3fbe5b57ff..ad1b2e44d538b 100644
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -1965,6 +1965,10 @@ struct super_operations {
+ 				  struct shrink_control *);
+ 	long (*free_cached_objects)(struct super_block *,
+ 				    struct shrink_control *);
++#if IS_ENABLED(CONFIG_BLK_DEV_LOOP) || IS_ENABLED(CONFIG_BLK_DEV_LOOP_MODULE)
++	/* and aufs */
++	struct file *(*real_loop)(struct file *);
++#endif
+ };
+ 
+ /*

aufs5-mmap.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 mmap patch
+
+diff --git a/fs/proc/base.c b/fs/proc/base.c
+index b3422cda2a91e..bda8e8ece7208 100644
+--- a/fs/proc/base.c
++++ b/fs/proc/base.c
+@@ -2184,7 +2184,7 @@ static int map_files_get_link(struct dentry *dentry, struct path *path)
+ 	rc = -ENOENT;
+ 	vma = find_exact_vma(mm, vm_start, vm_end);
+ 	if (vma && vma->vm_file) {
+-		*path = vma->vm_file->f_path;
++		*path = vma_pr_or_file(vma)->f_path;
+ 		path_get(path);
+ 		rc = 0;
+ 	}
+diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
+index 13452b32e2bd5..38acccfef9d49 100644
+--- a/fs/proc/nommu.c
++++ b/fs/proc/nommu.c
+@@ -40,7 +40,10 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region)
+ 	file = region->vm_file;
+ 
+ 	if (file) {
+-		struct inode *inode = file_inode(region->vm_file);
++		struct inode *inode;
++
++		file = vmr_pr_or_file(region);
++		inode = file_inode(file);
+ 		dev = inode->i_sb->s_dev;
+ 		ino = inode->i_ino;
+ 	}
+diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
+index 602e3a52884d8..a36614b84de16 100644
+--- a/fs/proc/task_mmu.c
++++ b/fs/proc/task_mmu.c
+@@ -280,7 +280,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
+ 	const char *name = NULL;
+ 
+ 	if (file) {
+-		struct inode *inode = file_inode(vma->vm_file);
++		struct inode *inode;
++
++		file = vma_pr_or_file(vma);
++		inode = file_inode(file);
+ 		dev = inode->i_sb->s_dev;
+ 		ino = inode->i_ino;
+ 		pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
+@@ -1862,7 +1865,7 @@ static int show_numa_map(struct seq_file *m, void *v)
+ 	struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
+ 	struct vm_area_struct *vma = v;
+ 	struct numa_maps *md = &numa_priv->md;
+-	struct file *file = vma->vm_file;
++	struct file *file = vma_pr_or_file(vma);
+ 	struct mm_struct *mm = vma->vm_mm;
+ 	struct mempolicy *pol;
+ 	char buffer[64];
+diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
+index a6d21fc0033c6..02c2de31196e0 100644
+--- a/fs/proc/task_nommu.c
++++ b/fs/proc/task_nommu.c
+@@ -155,7 +155,10 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
+ 	file = vma->vm_file;
+ 
+ 	if (file) {
+-		struct inode *inode = file_inode(vma->vm_file);
++		struct inode *inode;
++
++		file = vma_pr_or_file(vma);
++		inode = file_inode(file);
+ 		dev = inode->i_sb->s_dev;
+ 		ino = inode->i_ino;
+ 		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
+diff --git a/include/linux/mm.h b/include/linux/mm.h
+index ecdf8a8cd6aeb..d9b3ec02ecbef 100644
+--- a/include/linux/mm.h
++++ b/include/linux/mm.h
+@@ -1715,6 +1715,28 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping,
+ 	unmap_mapping_range(mapping, holebegin, holelen, 0);
+ }
+ 
++extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int);
++extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[],
++				      int);
++extern void vma_do_get_file(struct vm_area_struct *, const char[], int);
++extern void vma_do_fput(struct vm_area_struct *, const char[], int);
++
++#define vma_file_update_time(vma)	vma_do_file_update_time(vma, __func__, \
++								__LINE__)
++#define vma_pr_or_file(vma)		vma_do_pr_or_file(vma, __func__, \
++							  __LINE__)
++#define vma_get_file(vma)		vma_do_get_file(vma, __func__, __LINE__)
++#define vma_fput(vma)			vma_do_fput(vma, __func__, __LINE__)
++
++#ifndef CONFIG_MMU
++extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int);
++extern void vmr_do_fput(struct vm_region *, const char[], int);
++
++#define vmr_pr_or_file(region)		vmr_do_pr_or_file(region, __func__, \
++							  __LINE__)
++#define vmr_fput(region)		vmr_do_fput(region, __func__, __LINE__)
++#endif /* !CONFIG_MMU */
++
+ extern int access_process_vm(struct task_struct *tsk, unsigned long addr,
+ 		void *buf, int len, unsigned int gup_flags);
+ extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
+diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
+index 07d9acb5b19c4..2f395ab624f38 100644
+--- a/include/linux/mm_types.h
++++ b/include/linux/mm_types.h
+@@ -278,6 +278,7 @@ struct vm_region {
+ 	unsigned long	vm_top;		/* region allocated to here */
+ 	unsigned long	vm_pgoff;	/* the offset in vm_file corresponding to vm_start */
+ 	struct file	*vm_file;	/* the backing file or NULL */
++	struct file	*vm_prfile;	/* the virtual backing file or NULL */
+ 
+ 	int		vm_usage;	/* region usage count (access under nommu_region_sem) */
+ 	bool		vm_icache_flushed : 1; /* true if the icache has been flushed for
+@@ -357,6 +358,7 @@ struct vm_area_struct {
+ 	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
+ 					   units */
+ 	struct file * vm_file;		/* File we map to (can be NULL). */
++	struct file *vm_prfile;		/* shadow of vm_file */
+ 	void * vm_private_data;		/* was vm_pte (shared mem) */
+ 
+ #ifdef CONFIG_SWAP
+diff --git a/kernel/fork.c b/kernel/fork.c
+index d66cd1014211b..a2addc21d63fc 100644
+--- a/kernel/fork.c
++++ b/kernel/fork.c
+@@ -555,7 +555,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
+ 			struct inode *inode = file_inode(file);
+ 			struct address_space *mapping = file->f_mapping;
+ 
+-			get_file(file);
++			vma_get_file(tmp);
+ 			if (tmp->vm_flags & VM_DENYWRITE)
+ 				put_write_access(inode);
+ 			i_mmap_lock_write(mapping);
+diff --git a/mm/Makefile b/mm/Makefile
+index b6cd2fffa4922..784e2cebe1eac 100644
+--- a/mm/Makefile
++++ b/mm/Makefile
+@@ -52,7 +52,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
+ 			   mm_init.o percpu.o slab_common.o \
+ 			   compaction.o vmacache.o \
+ 			   interval_tree.o list_lru.o workingset.o \
+-			   debug.o gup.o mmap_lock.o $(mmu-y)
++			   prfile.o debug.o gup.o mmap_lock.o $(mmu-y)
+ 
+ # Give 'page_alloc' its own module-parameter namespace
+ page-alloc-y := page_alloc.o
+diff --git a/mm/filemap.c b/mm/filemap.c
+index aa0e0fb046700..d883a19f4237e 100644
+--- a/mm/filemap.c
++++ b/mm/filemap.c
+@@ -2993,7 +2993,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
+ 	vm_fault_t ret = VM_FAULT_LOCKED;
+ 
+ 	sb_start_pagefault(mapping->host->i_sb);
+-	file_update_time(vmf->vma->vm_file);
++	vma_file_update_time(vmf->vma);
+ 	lock_page(page);
+ 	if (page->mapping != mapping) {
+ 		unlock_page(page);
+diff --git a/mm/mmap.c b/mm/mmap.c
+index dc7206032387c..09b10e20c097c 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -179,7 +179,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
+ 	if (vma->vm_ops && vma->vm_ops->close)
+ 		vma->vm_ops->close(vma);
+ 	if (vma->vm_file)
+-		fput(vma->vm_file);
++		vma_fput(vma);
+ 	mpol_put(vma_policy(vma));
+ 	vm_area_free(vma);
+ 	return next;
+@@ -951,7 +951,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
+ 	if (remove_next) {
+ 		if (file) {
+ 			uprobe_munmap(next, next->vm_start, next->vm_end);
+-			fput(file);
++			vma_fput(vma);
+ 		}
+ 		if (next->anon_vma)
+ 			anon_vma_merge(vma, next);
+@@ -1897,7 +1897,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
+ 	return addr;
+ 
+ unmap_and_free_vma:
+-	fput(vma->vm_file);
++	vma_fput(vma);
+ 	vma->vm_file = NULL;
+ 
+ 	/* Undo any partial mapping done by a device driver. */
+@@ -2757,7 +2757,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
+ 		goto out_free_mpol;
+ 
+ 	if (new->vm_file)
+-		get_file(new->vm_file);
++		vma_get_file(new);
+ 
+ 	if (new->vm_ops && new->vm_ops->open)
+ 		new->vm_ops->open(new);
+@@ -2776,7 +2776,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
+ 	if (new->vm_ops && new->vm_ops->close)
+ 		new->vm_ops->close(new);
+ 	if (new->vm_file)
+-		fput(new->vm_file);
++		vma_fput(new);
+ 	unlink_anon_vmas(new);
+  out_free_mpol:
+ 	mpol_put(vma_policy(new));
+@@ -2969,7 +2969,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
+ 	struct vm_area_struct *vma;
+ 	unsigned long populate = 0;
+ 	unsigned long ret = -EINVAL;
+-	struct file *file;
++	struct file *file, *prfile;
+ 
+ 	pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n",
+ 		     current->comm, current->pid);
+@@ -3044,10 +3044,27 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
+ 		}
+ 	}
+ 
+-	file = get_file(vma->vm_file);
++	vma_get_file(vma);
++	file = vma->vm_file;
++	prfile = vma->vm_prfile;
+ 	ret = do_mmap(vma->vm_file, start, size,
+ 			prot, flags, pgoff, &populate, NULL);
++	if (!IS_ERR_VALUE(ret) && file && prfile) {
++		struct vm_area_struct *new_vma;
++
++		new_vma = find_vma(mm, ret);
++		if (!new_vma->vm_prfile)
++			new_vma->vm_prfile = prfile;
++		if (new_vma != vma)
++			get_file(prfile);
++	}
++	/*
++	 * two fput()s instead of vma_fput(vma),
++	 * coz vma may not be available anymore.
++	 */
+ 	fput(file);
++	if (prfile)
++		fput(prfile);
+ out:
+ 	mmap_write_unlock(mm);
+ 	if (populate)
+@@ -3334,7 +3351,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
+ 		if (anon_vma_clone(new_vma, vma))
+ 			goto out_free_mempol;
+ 		if (new_vma->vm_file)
+-			get_file(new_vma->vm_file);
++			vma_get_file(new_vma);
+ 		if (new_vma->vm_ops && new_vma->vm_ops->open)
+ 			new_vma->vm_ops->open(new_vma);
+ 		vma_link(mm, new_vma, prev, rb_link, rb_parent);
+diff --git a/mm/nommu.c b/mm/nommu.c
+index 870fea12823e6..edbc99eee5b6b 100644
+--- a/mm/nommu.c
++++ b/mm/nommu.c
+@@ -533,7 +533,7 @@ static void __put_nommu_region(struct vm_region *region)
+ 		up_write(&nommu_region_sem);
+ 
+ 		if (region->vm_file)
+-			fput(region->vm_file);
++			vmr_fput(region);
+ 
+ 		/* IO memory and memory shared directly out of the pagecache
+ 		 * from ramfs/tmpfs mustn't be released here */
+@@ -665,7 +665,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
+ 	if (vma->vm_ops && vma->vm_ops->close)
+ 		vma->vm_ops->close(vma);
+ 	if (vma->vm_file)
+-		fput(vma->vm_file);
++		vma_fput(vma);
+ 	put_nommu_region(vma->vm_region);
+ 	vm_area_free(vma);
+ }
+@@ -1188,7 +1188,7 @@ unsigned long do_mmap(struct file *file,
+ 					goto error_just_free;
+ 				}
+ 			}
+-			fput(region->vm_file);
++			vmr_fput(region);
+ 			kmem_cache_free(vm_region_jar, region);
+ 			region = pregion;
+ 			result = start;
+@@ -1265,10 +1265,10 @@ unsigned long do_mmap(struct file *file,
+ 	up_write(&nommu_region_sem);
+ error:
+ 	if (region->vm_file)
+-		fput(region->vm_file);
++		vmr_fput(region);
+ 	kmem_cache_free(vm_region_jar, region);
+ 	if (vma->vm_file)
+-		fput(vma->vm_file);
++		vma_fput(vma);
+ 	vm_area_free(vma);
+ 	return ret;
+ 
+diff --git a/mm/prfile.c b/mm/prfile.c
+new file mode 100644
+index 0000000000000..00d51187c3250
+--- /dev/null
++++ b/mm/prfile.c
+@@ -0,0 +1,86 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Mainly for aufs which mmap(2) different file and wants to print different
++ * path in /proc/PID/maps.
++ * Call these functions via macros defined in linux/mm.h.
++ *
++ * See Documentation/filesystems/aufs/design/06mmap.txt
++ *
++ * Copyright (c) 2014-2020 Junjro R. Okajima
++ * Copyright (c) 2014 Ian Campbell
++ */
++
++#include <linux/mm.h>
++#include <linux/file.h>
++#include <linux/fs.h>
++
++/* #define PRFILE_TRACE */
++static inline void prfile_trace(struct file *f, struct file *pr,
++			      const char func[], int line, const char func2[])
++{
++#ifdef PRFILE_TRACE
++	if (pr)
++		pr_info("%s:%d: %s, %pD2\n", func, line, func2, f);
++#endif
++}
++
++void vma_do_file_update_time(struct vm_area_struct *vma, const char func[],
++			     int line)
++{
++	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	file_update_time(f);
++	if (f && pr)
++		file_update_time(pr);
++}
++
++struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[],
++			       int line)
++{
++	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	return (f && pr) ? pr : f;
++}
++
++void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line)
++{
++	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	get_file(f);
++	if (f && pr)
++		get_file(pr);
++}
++
++void vma_do_fput(struct vm_area_struct *vma, const char func[], int line)
++{
++	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	fput(f);
++	if (f && pr)
++		fput(pr);
++}
++
++#ifndef CONFIG_MMU
++struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[],
++			       int line)
++{
++	struct file *f = region->vm_file, *pr = region->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	return (f && pr) ? pr : f;
++}
++
++void vmr_do_fput(struct vm_region *region, const char func[], int line)
++{
++	struct file *f = region->vm_file, *pr = region->vm_prfile;
++
++	prfile_trace(f, pr, func, line, __func__);
++	fput(f);
++	if (f && pr)
++		fput(pr);
++}
++#endif /* !CONFIG_MMU */

aufs5-standalone.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 standalone patch
+
+diff --git a/fs/dcache.c b/fs/dcache.c
+index a7522ebbca659..d429c984133ca 100644
+--- a/fs/dcache.c
++++ b/fs/dcache.c
+@@ -1397,6 +1397,7 @@ void d_walk(struct dentry *parent, void *data,
+ 	seq = 1;
+ 	goto again;
+ }
++EXPORT_SYMBOL_GPL(d_walk);
+ 
+ struct check_mount {
+ 	struct vfsmount *mnt;
+@@ -2942,6 +2943,7 @@ void d_exchange(struct dentry *dentry1, struct dentry *dentry2)
+ 
+ 	write_sequnlock(&rename_lock);
+ }
++EXPORT_SYMBOL_GPL(d_exchange);
+ 
+ /**
+  * d_ancestor - search for an ancestor
+diff --git a/fs/exec.c b/fs/exec.c
+index 5d4d52039105c..adc75877cdee7 100644
+--- a/fs/exec.c
++++ b/fs/exec.c
+@@ -114,6 +114,7 @@ bool path_noexec(const struct path *path)
+ 	return (path->mnt->mnt_flags & MNT_NOEXEC) ||
+ 	       (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC);
+ }
++EXPORT_SYMBOL_GPL(path_noexec);
+ 
+ #ifdef CONFIG_USELIB
+ /*
+diff --git a/fs/fcntl.c b/fs/fcntl.c
+index e747a47a97da4..d6211ff25c9a4 100644
+--- a/fs/fcntl.c
++++ b/fs/fcntl.c
+@@ -85,6 +85,7 @@ int setfl(int fd, struct file *filp, unsigned long arg)
+  out:
+ 	return error;
+ }
++EXPORT_SYMBOL_GPL(setfl);
+ 
+ static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
+                      int force)
+diff --git a/fs/file_table.c b/fs/file_table.c
+index 45437f8e1003e..786af52904fcf 100644
+--- a/fs/file_table.c
++++ b/fs/file_table.c
+@@ -161,6 +161,7 @@ struct file *alloc_empty_file(int flags, const struct cred *cred)
+ 	}
+ 	return ERR_PTR(-ENFILE);
+ }
++EXPORT_SYMBOL_GPL(alloc_empty_file);
+ 
+ /*
+  * Variant of alloc_empty_file() that doesn't check and modify nr_files.
+@@ -375,6 +376,7 @@ void __fput_sync(struct file *file)
+ }
+ 
+ EXPORT_SYMBOL(fput);
++EXPORT_SYMBOL_GPL(__fput_sync);
+ 
+ void __init files_init(void)
+ {
+diff --git a/fs/inode.c b/fs/inode.c
+index e4a25c3fa9e55..497326faa1247 100644
+--- a/fs/inode.c
++++ b/fs/inode.c
+@@ -1775,6 +1775,7 @@ int update_time(struct inode *inode, struct timespec64 *time, int flags)
+ 		return inode->i_op->update_time(inode, time, flags);
+ 	return generic_update_time(inode, time, flags);
+ }
++EXPORT_SYMBOL_GPL(update_time);
+ 
+ /**
+  *	touch_atime	-	update the access time
+diff --git a/fs/namespace.c b/fs/namespace.c
+index 3e16fc64df8b8..eed3453ec40a8 100644
+--- a/fs/namespace.c
++++ b/fs/namespace.c
+@@ -431,6 +431,7 @@ void __mnt_drop_write(struct vfsmount *mnt)
+ 	mnt_dec_writers(real_mount(mnt));
+ 	preempt_enable();
+ }
++EXPORT_SYMBOL_GPL(__mnt_drop_write);
+ 
+ /**
+  * mnt_drop_write - give up write access to a mount
+@@ -797,6 +798,7 @@ int is_current_mnt_ns(struct vfsmount *mnt)
+ {
+ 	return check_mnt(real_mount(mnt));
+ }
++EXPORT_SYMBOL_GPL(is_current_mnt_ns);
+ 
+ /*
+  * vfsmount lock must be held for write
+@@ -1967,6 +1969,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
+ 	}
+ 	return 0;
+ }
++EXPORT_SYMBOL_GPL(iterate_mounts);
+ 
+ static void lock_mnt_tree(struct mount *mnt)
+ {
+diff --git a/fs/notify/group.c b/fs/notify/group.c
+index a4a4b1c64d32a..86dc2efb1850c 100644
+--- a/fs/notify/group.c
++++ b/fs/notify/group.c
+@@ -100,6 +100,7 @@ void fsnotify_get_group(struct fsnotify_group *group)
+ {
+ 	refcount_inc(&group->refcnt);
+ }
++EXPORT_SYMBOL_GPL(fsnotify_get_group);
+ 
+ /*
+  * Drop a reference to a group.  Free it if it's through.
+diff --git a/fs/open.c b/fs/open.c
+index 1e06e443a5651..c3bbb8aafcd1a 100644
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -65,6 +65,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
+ 	inode_unlock(dentry->d_inode);
+ 	return ret;
+ }
++EXPORT_SYMBOL_GPL(do_truncate);
+ 
+ long vfs_truncate(const struct path *path, loff_t length)
+ {
+diff --git a/fs/read_write.c b/fs/read_write.c
+index 75f764b434184..7582bb3fb634b 100644
+--- a/fs/read_write.c
++++ b/fs/read_write.c
+@@ -503,6 +503,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
+ 	inc_syscr(current);
+ 	return ret;
+ }
++EXPORT_SYMBOL_GPL(vfs_read);
+ 
+ static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
+ {
+@@ -613,6 +614,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
+ 	file_end_write(file);
+ 	return ret;
+ }
++EXPORT_SYMBOL_GPL(vfs_write);
+ 
+ /* file_ppos returns &file->f_pos or NULL if file is stream */
+ static inline loff_t *file_ppos(struct file *file)
+diff --git a/fs/splice.c b/fs/splice.c
+index 55b5356262085..c13ac0fbac318 100644
+--- a/fs/splice.c
++++ b/fs/splice.c
+@@ -763,6 +763,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ 		return warn_unsupported(out, "write");
+ 	return out->f_op->splice_write(pipe, out, ppos, len, flags);
+ }
++EXPORT_SYMBOL_GPL(do_splice_from);
+ 
+ /*
+  * Attempt to initiate a splice from a file to a pipe.
+@@ -787,6 +788,7 @@ long do_splice_to(struct file *in, loff_t *ppos,
+ 		return warn_unsupported(in, "read");
+ 	return in->f_op->splice_read(in, ppos, pipe, len, flags);
+ }
++EXPORT_SYMBOL_GPL(do_splice_to);
+ 
+ /**
+  * splice_direct_to_actor - splices data directly between two non-pipes
+diff --git a/fs/sync.c b/fs/sync.c
+index b7b5a0a0df6ff..fa5c7fba7f1ba 100644
+--- a/fs/sync.c
++++ b/fs/sync.c
+@@ -39,6 +39,7 @@ int __sync_filesystem(struct super_block *sb, int wait)
+ 		sb->s_op->sync_fs(sb, wait);
+ 	return __sync_blockdev(sb->s_bdev, wait);
+ }
++EXPORT_SYMBOL_GPL(__sync_filesystem);
+ 
+ /*
+  * Write out and wait upon all dirty data associated with this
+diff --git a/fs/xattr.c b/fs/xattr.c
+index fd57153b1f617..d8e9d0d6853ef 100644
+--- a/fs/xattr.c
++++ b/fs/xattr.c
+@@ -371,6 +371,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
+ 	*xattr_value = value;
+ 	return error;
+ }
++EXPORT_SYMBOL_GPL(vfs_getxattr_alloc);
+ 
+ ssize_t
+ __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name,
+diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
+index 5c3bff75de111..ff00031462623 100644
+--- a/kernel/locking/lockdep.c
++++ b/kernel/locking/lockdep.c
+@@ -209,6 +209,7 @@ inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock)
+ 	 */
+ 	return lock_classes + class_idx;
+ }
++EXPORT_SYMBOL_GPL(lockdep_hlock_class);
+ #define hlock_class(hlock) lockdep_hlock_class(hlock)
+ 
+ #ifdef CONFIG_LOCK_STAT
+diff --git a/kernel/task_work.c b/kernel/task_work.c
+index 9cde961875c0a..ac8c79dc81813 100644
+--- a/kernel/task_work.c
++++ b/kernel/task_work.c
+@@ -143,3 +143,4 @@ void task_work_run(void)
+ 		} while (work);
+ 	}
+ }
++EXPORT_SYMBOL_GPL(task_work_run);
+diff --git a/security/security.c b/security/security.c
+index 7b09cfbae94f7..3e060cc948262 100644
+--- a/security/security.c
++++ b/security/security.c
+@@ -1094,6 +1094,7 @@ int security_path_rmdir(const struct path *dir, struct dentry *dentry)
+ 		return 0;
+ 	return call_int_hook(path_rmdir, 0, dir, dentry);
+ }
++EXPORT_SYMBOL_GPL(security_path_rmdir);
+ 
+ int security_path_unlink(const struct path *dir, struct dentry *dentry)
+ {
+@@ -1110,6 +1111,7 @@ int security_path_symlink(const struct path *dir, struct dentry *dentry,
+ 		return 0;
+ 	return call_int_hook(path_symlink, 0, dir, dentry, old_name);
+ }
++EXPORT_SYMBOL_GPL(security_path_symlink);
+ 
+ int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
+ 		       struct dentry *new_dentry)
+@@ -1118,6 +1120,7 @@ int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
+ 		return 0;
+ 	return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
+ }
++EXPORT_SYMBOL_GPL(security_path_link);
+ 
+ int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
+ 			 const struct path *new_dir, struct dentry *new_dentry,
+@@ -1145,6 +1148,7 @@ int security_path_truncate(const struct path *path)
+ 		return 0;
+ 	return call_int_hook(path_truncate, 0, path);
+ }
++EXPORT_SYMBOL_GPL(security_path_truncate);
+ 
+ int security_path_chmod(const struct path *path, umode_t mode)
+ {
+@@ -1152,6 +1156,7 @@ int security_path_chmod(const struct path *path, umode_t mode)
+ 		return 0;
+ 	return call_int_hook(path_chmod, 0, path, mode);
+ }
++EXPORT_SYMBOL_GPL(security_path_chmod);
+ 
+ int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
+ {
+@@ -1159,6 +1164,7 @@ int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
+ 		return 0;
+ 	return call_int_hook(path_chown, 0, path, uid, gid);
+ }
++EXPORT_SYMBOL_GPL(security_path_chown);
+ 
+ int security_path_chroot(const struct path *path)
+ {
+@@ -1259,6 +1265,7 @@ int security_inode_permission(struct inode *inode, int mask)
+ 		return 0;
+ 	return call_int_hook(inode_permission, 0, inode, mask);
+ }
++EXPORT_SYMBOL_GPL(security_inode_permission);
+ 
+ int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
+ {
+@@ -1451,6 +1458,7 @@ int security_file_permission(struct file *file, int mask)
+ 
+ 	return fsnotify_perm(file, mask);
+ }
++EXPORT_SYMBOL_GPL(security_file_permission);
+ 
+ int security_file_alloc(struct file *file)
+ {

include/uapi/linux/aufs_type.h

@@ -40,7 +40,7 @@
 #include <limits.h>
 #endif /* __KERNEL__ */
 
-#define AUFS_VERSION	"5.11"
+#define AUFS_VERSION	"5.11-20210222"
 
 /* todo? move this to linux-2.6.19/include/magic.h */
 #define AUFS_SUPER_MAGIC	('a' << 24 | 'u' << 16 | 'f' << 8 | 's')

lockdep-debug.patch

+SPDX-License-Identifier: GPL-2.0
+aufs5.11 lockdep patch
+
+diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
+index e152c49cc3163..78d8963ba9a31 100644
+--- a/include/linux/lockdep.h
++++ b/include/linux/lockdep.h
+diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
+index ff00031462623..b76744a37ed28 100644
+--- a/kernel/locking/lockdep.c
++++ b/kernel/locking/lockdep.c
+diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
+index de49f9e1c11ba..df5b79a3122b9 100644
+--- a/kernel/locking/lockdep_internals.h
++++ b/kernel/locking/lockdep_internals.h
+@@ -99,15 +99,15 @@ static const unsigned long LOCKF_USED_IN_IRQ_READ =
+ #define MAX_STACK_TRACE_ENTRIES	262144UL
+ #define STACK_TRACE_HASH_SIZE	8192
+ #else
+-#define MAX_LOCKDEP_ENTRIES	32768UL
++#define MAX_LOCKDEP_ENTRIES	(32768UL << 5)
+ 
+-#define MAX_LOCKDEP_CHAINS_BITS	16
++#define MAX_LOCKDEP_CHAINS_BITS	(16 + 5)
+ 
+ /*
+  * Stack-trace: tightly packed array of stack backtrace
+  * addresses. Protected by the hash_lock.
+  */
+-#define MAX_STACK_TRACE_ENTRIES	524288UL
++#define MAX_STACK_TRACE_ENTRIES	(524288UL << 5)
+ #define STACK_TRACE_HASH_SIZE	16384
+ #endif
+ 

tmpfs-idr.patch

+SPDX-License-Identifier: GPL-2.0
+
+diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
+index d82b6f396588..ff9c7acfedc8 100644
+--- a/include/linux/shmem_fs.h
++++ b/include/linux/shmem_fs.h
+@@ -27,10 +27,13 @@ struct shmem_inode_info {
+ };
+ 
+ struct shmem_sb_info {
++	struct mutex idr_lock;
++	bool idr_nouse;
++	struct idr idr;		    /* manages inode-number */
+ 	unsigned long max_blocks;   /* How many blocks are allowed */
+ 	struct percpu_counter used_blocks;  /* How many are allocated */
+-	unsigned long max_inodes;   /* How many inodes are allowed */
+-	unsigned long free_inodes;  /* How many are left for allocation */
++	int max_inodes;		    /* How many inodes are allowed */
++	int free_inodes;	    /* How many are left for allocation */
+ 	spinlock_t stat_lock;	    /* Serialize shmem_sb_info changes */
+ 	umode_t mode;		    /* Mount mode for root directory */
+ 	unsigned char huge;	    /* Whether to try for hugepages */
+diff --git a/mm/shmem.c b/mm/shmem.c
+index 7c6b6d8f6c39..889d4a603217 100644
+--- a/mm/shmem.c
++++ b/mm/shmem.c
+@@ -109,7 +109,7 @@ struct shmem_falloc {
+ 
+ struct shmem_options {
+ 	unsigned long long blocks;
+-	unsigned long long inodes;
++	int inodes;
+ 	struct mempolicy *mpol;
+ 	kuid_t uid;
+ 	kgid_t gid;
+@@ -129,11 +129,14 @@ static unsigned long shmem_default_max_blocks(void)
+ 	return totalram_pages() / 2;
+ }
+ 
+-static unsigned long shmem_default_max_inodes(void)
++static int shmem_default_max_inodes(void)
+ {
+ 	unsigned long nr_pages = totalram_pages();
++	unsigned long ul;
+ 
+-	return min(nr_pages - totalhigh_pages(), nr_pages / 2);
++	ul = INT_MAX;
++	ul = min3(ul, nr_pages - totalhigh_pages(), nr_pages / 2);
++	return ul;
+ }
+ #endif
+ 
+@@ -1178,6 +1181,11 @@ static void shmem_evict_inode(struct inode *inode)
+ 
+ 	simple_xattrs_free(&info->xattrs);
+ 	WARN_ON(inode->i_blocks);
++	if (!sbinfo->idr_nouse && inode->i_ino) {
++		mutex_lock(&sbinfo->idr_lock);
++		idr_remove(&sbinfo->idr, inode->i_ino);
++		mutex_unlock(&sbinfo->idr_lock);
++	}
+ 	shmem_free_inode(inode->i_sb);
+ 	clear_inode(inode);
+ }
+@@ -2302,7 +2310,6 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
+ 
+ 	inode = new_inode(sb);
+ 	if (inode) {
+-		inode->i_ino = ino;
+ 		inode_init_owner(inode, dir, mode);
+ 		inode->i_blocks = 0;
+ 		inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+@@ -2346,6 +2353,25 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
+ 			break;
+ 		}
+ 
++		if (!sbinfo->idr_nouse) {
++			/* inum 0 and 1 are unused */
++			mutex_lock(&sbinfo->idr_lock);
++			ino = idr_alloc(&sbinfo->idr, inode, 2, INT_MAX,
++					GFP_NOFS);
++			if (ino > 0) {
++				inode->i_ino = ino;
++				mutex_unlock(&sbinfo->idr_lock);
++				__insert_inode_hash(inode, inode->i_ino);
++			} else {
++				inode->i_ino = 0;
++				mutex_unlock(&sbinfo->idr_lock);
++				iput(inode);
++				/* shmem_free_inode() will be called */
++				inode = NULL;
++			}
++		} else
++			inode->i_ino = ino;
++
+ 		lockdep_annotate_inode_mutex_key(inode);
+ 	} else
+ 		shmem_free_inode(sb);
+@@ -3334,8 +3360,7 @@ static struct dentry *shmem_get_parent(struct dentry *child)
+ static int shmem_match(struct inode *ino, void *vfh)
+ {
+ 	__u32 *fh = vfh;
+-	__u64 inum = fh[2];
+-	inum = (inum << 32) | fh[1];
++	__u64 inum = fh[1];
+ 	return ino->i_ino == inum && fh[0] == ino->i_generation;
+ }
+ 
+@@ -3355,14 +3380,11 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
+ 	struct dentry *dentry = NULL;
+ 	u64 inum;
+ 
+-	if (fh_len < 3)
++	if (fh_len < 2)
+ 		return NULL;
+ 
+-	inum = fid->raw[2];
+-	inum = (inum << 32) | fid->raw[1];
+-
+-	inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]),
+-			shmem_match, fid->raw);
++	inum = fid->raw[1];
++	inode = ilookup5(sb, inum, shmem_match, fid->raw);
+ 	if (inode) {
+ 		dentry = shmem_find_alias(inode);
+ 		iput(inode);
+@@ -3374,30 +3396,15 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
+ static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len,
+ 				struct inode *parent)
+ {
+-	if (*len < 3) {
+-		*len = 3;
++	if (*len < 2) {
++		*len = 2;
+ 		return FILEID_INVALID;
+ 	}
+ 
+-	if (inode_unhashed(inode)) {
+-		/* Unfortunately insert_inode_hash is not idempotent,
+-		 * so as we hash inodes here rather than at creation
+-		 * time, we need a lock to ensure we only try
+-		 * to do it once
+-		 */
+-		static DEFINE_SPINLOCK(lock);
+-		spin_lock(&lock);
+-		if (inode_unhashed(inode))
+-			__insert_inode_hash(inode,
+-					    inode->i_ino + inode->i_generation);
+-		spin_unlock(&lock);
+-	}
+-
+ 	fh[0] = inode->i_generation;
+ 	fh[1] = inode->i_ino;
+-	fh[2] = ((__u64)inode->i_ino) >> 32;
+ 
+-	*len = 3;
++	*len = 2;
+ 	return 1;
+ }
+ 
+@@ -3476,7 +3483,7 @@ static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)
+ 		break;
+ 	case Opt_nr_inodes:
+ 		ctx->inodes = memparse(param->string, &rest);
+-		if (*rest)
++		if (*rest || ctx->inodes < 2)
+ 			goto bad_value;
+ 		ctx->seen |= SHMEM_SEEN_INODES;
+ 		break;
+@@ -3586,7 +3593,7 @@ static int shmem_reconfigure(struct fs_context *fc)
+ {
+ 	struct shmem_options *ctx = fc->fs_private;
+ 	struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb);
+-	unsigned long inodes;
++	int inodes;
+ 	const char *err;
+ 
+ 	spin_lock(&sbinfo->stat_lock);
+@@ -3653,7 +3660,7 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root)
+ 		seq_printf(seq, ",size=%luk",
+ 			sbinfo->max_blocks << (PAGE_SHIFT - 10));
+ 	if (sbinfo->max_inodes != shmem_default_max_inodes())
+-		seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
++		seq_printf(seq, ",nr_inodes=%d", sbinfo->max_inodes);
+ 	if (sbinfo->mode != (0777 | S_ISVTX))
+ 		seq_printf(seq, ",mode=%03ho", sbinfo->mode);
+ 	if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
+@@ -3700,6 +3707,8 @@ static void shmem_put_super(struct super_block *sb)
+ {
+ 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+ 
++	if (!sbinfo->idr_nouse)
++		idr_destroy(&sbinfo->idr);
+ 	free_percpu(sbinfo->ino_batch);
+ 	percpu_counter_destroy(&sbinfo->used_blocks);
+ 	mpol_put(sbinfo->mpol);
+@@ -3743,6 +3752,8 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
+ #else
+ 	sb->s_flags |= SB_NOUSER;
+ #endif
++	mutex_init(&sbinfo->idr_lock);
++	idr_init(&sbinfo->idr);
+ 	sbinfo->max_blocks = ctx->blocks;
+ 	sbinfo->free_inodes = sbinfo->max_inodes = ctx->inodes;
+ 	if (sb->s_flags & SB_KERNMOUNT) {
+@@ -3860,7 +3871,16 @@ static void shmem_destroy_inodecache(void)
+ 	kmem_cache_destroy(shmem_inode_cachep);
+ }
+ 
+-const struct address_space_operations shmem_aops = {
++static __init void shmem_no_idr(struct super_block *sb)
++{
++	struct shmem_sb_info *sbinfo;
++
++	sbinfo = SHMEM_SB(sb);
++	sbinfo->idr_nouse = true;
++	idr_destroy(&sbinfo->idr);
++}
++
++static const struct address_space_operations shmem_aops = {
+ 	.writepage	= shmem_writepage,
+ 	.set_page_dirty	= __set_page_dirty_no_writeback,
+ #ifdef CONFIG_TMPFS
+@@ -4001,6 +4021,7 @@ int __init shmem_init(void)
+ 		pr_err("Could not kern_mount tmpfs\n");
+ 		goto out1;
+ 	}
++	shmem_no_idr(shm_mnt->mnt_sb);
+ 
+ #ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ 	if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY)

vfs-ino.patch

+SPDX-License-Identifier: GPL-2.0
+
+diff --git a/fs/inode.c b/fs/inode.c
+index 6442d97d9a4a..6fc78882550e 100644
+--- a/fs/inode.c
++++ b/fs/inode.c
+@@ -893,6 +893,8 @@ unsigned int get_next_ino(void)
+ 	unsigned int *p = &get_cpu_var(last_ino);
+ 	unsigned int res = *p;
+ 
++start:
++
+ #ifdef CONFIG_SMP
+ 	if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) {
+ 		static atomic_t shared_last_ino;
+@@ -905,7 +907,7 @@ unsigned int get_next_ino(void)
+ 	res++;
+ 	/* get_next_ino should not provide a 0 inode number */
+ 	if (unlikely(!res))
+-		res++;
++		goto start;
+ 	*p = res;
+ 	put_cpu_var(last_ino);
+ 	return res;