+ fs-explicitly-unregister-per-superblock-bdis.patch added to -mm tree

The patch titled
     Subject: fs: explicitly unregister per-superblock BDIs
has been added to the -mm tree.  Its filename is
     fs-explicitly-unregister-per-superblock-bdis.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/fs-explicitly-unregister-per-superblock-bdis.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/fs-explicitly-unregister-per-superblock-bdis.patch

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: fs: explicitly unregister per-superblock BDIs

Add a new SB_I_ flag to mark superblocks that have an ephemeral bdi
associated with them, and unregister it when the superblock is shut down.

Link: https://lkml.kernel.org/r/20211021124441.668816-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/super.c         |    3 +++
 include/linux/fs.h |    1 +
 2 files changed, 4 insertions(+)

--- a/fs/super.c~fs-explicitly-unregister-per-superblock-bdis
+++ a/fs/super.c

@@ -476,6 +476,8 @@ void generic_shutdown_super(struct super
 	spin_unlock(&sb_lock);
 	up_write(&sb->s_umount);
 	if (sb->s_bdi != &noop_backing_dev_info) {
+		if (sb->s_iflags & SB_I_PERSB_BDI)
+			bdi_unregister(sb->s_bdi);
 		bdi_put(sb->s_bdi);
 		sb->s_bdi = &noop_backing_dev_info;
 	}

@@ -1562,6 +1564,7 @@ int super_setup_bdi_name(struct super_bl
 	}
 	WARN_ON(sb->s_bdi != &noop_backing_dev_info);
 	sb->s_bdi = bdi;
+	sb->s_iflags |= SB_I_PERSB_BDI;
 
 	return 0;
 }
--- a/include/linux/fs.h~fs-explicitly-unregister-per-superblock-bdis
+++ a/include/linux/fs.h

@@ -1443,6 +1443,7 @@ extern int send_sigurg(struct fown_struc
 #define SB_I_UNTRUSTED_MOUNTER		0x00000040
 
 #define SB_I_SKIP_SYNC	0x00000100	/* Skip superblock at global sync */
+#define SB_I_PERSB_BDI	0x00000200	/* has a per-sb bdi */
 
 /* Possible states of 'frozen' field */
 enum {

_

Patches currently in -mm which might be from hch@lst.de are

mm-dont-include-linux-daxh-in-linux-mempolicyh.patch
mm-export-bdi_unregister.patch
mtd-call-bdi_unregister-explicitly.patch
fs-explicitly-unregister-per-superblock-bdis.patch
mm-dont-automatically-unregister-bdis.patch
mm-simplify-bdi-refcounting.patch
mm-unexport-folio_memcg_unlock.patch
mm-unexport-unlock_page_memcg.patch