+ afs-fix-dangling-folio-ref-counts-in-writeback.patch added to mm-hotfixes-unstable branch

+ afs-fix-dangling-folio-ref-counts-in-writeback.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: afs: fix dangling folio ref counts in writeback
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     afs-fix-dangling-folio-ref-counts-in-writeback.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/afs-fix-dangling-folio-ref-counts-in-writeback.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Subject: afs: fix dangling folio ref counts in writeback
Date: Wed, 7 Jun 2023 13:41:19 -0700

Commit acc8d8588cb7 converted afs_writepages_region() to write back a
folio batch.  If writeback needs rescheduling, the function exits without
dropping the references to the folios in fbatch.  This patch fixes that.

Link: https://lkml.kernel.org/r/20230607204120.89416-1-vishal.moola@gmail.com
Fixes: acc8d8588cb7 ("afs: convert afs_writepages_region() to use filemap_get_folios_tag()")
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/afs/write.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/afs/write.c~afs-fix-dangling-folio-ref-counts-in-writeback
+++ a/fs/afs/write.c
@@ -764,6 +764,7 @@ static int afs_writepages_region(struct
 					if (skips >= 5 || need_resched()) {
 						*_next = start;
 						_leave(" = 0 [%llx]", *_next);
+						folio_batch_release(&fbatch);
 						return 0;
 					}
 					skips++;
_

Patches currently in -mm which might be from vishal.moola@gmail.com are

afs-fix-dangling-folio-ref-counts-in-writeback.patch
afs-fix-waiting-for-writeback-then-skipping-folio.patch