+ afs-fix-waiting-for-writeback-then-skipping-folio.patch added to mm-hotfixes-unstable branch

+ afs-fix-waiting-for-writeback-then-skipping-folio.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: afs: fix waiting for writeback then skipping folio
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     afs-fix-waiting-for-writeback-then-skipping-folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/afs-fix-waiting-for-writeback-then-skipping-folio.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 waiting for writeback then skipping folio
Date: Wed, 7 Jun 2023 13:41:20 -0700

Commit acc8d8588cb7 converted afs_writepages_region() to write back a
folio batch. The function waits for writeback to a folio, but then
proceeds to the rest of the batch without trying to write that folio
again. This patch fixes has it attempt to write the folio again.

This has only been compile tested.

Link: https://lkml.kernel.org/r/20230607204120.89416-2-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 |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/afs/write.c~afs-fix-waiting-for-writeback-then-skipping-folio
+++ a/fs/afs/write.c
@@ -731,6 +731,7 @@ static int afs_writepages_region(struct
 			 * (changing page->mapping to NULL), or even swizzled
 			 * back from swapper_space to tmpfs file mapping
 			 */
+try_again:
 			if (wbc->sync_mode != WB_SYNC_NONE) {
 				ret = folio_lock_killable(folio);
 				if (ret < 0) {
@@ -757,6 +758,7 @@ static int afs_writepages_region(struct
 #ifdef CONFIG_AFS_FSCACHE
 					folio_wait_fscache(folio);
 #endif
+					goto try_again;
 				} else {
 					start += folio_size(folio);
 				}
_

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