[merged] fs-explicitly-unregister-per-superblock-bdis.patch removed from -mm tree

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The patch titled
     Subject: fs: explicitly unregister per-superblock BDIs
has been removed from the -mm tree.  Its filename was
     fs-explicitly-unregister-per-superblock-bdis.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
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@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Vignesh Raghavendra <vigneshr@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 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@xxxxxx are

mm-unexport-folio_memcg_unlock.patch
mm-unexport-unlock_page_memcg.patch




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