2024-03-27 12:40:35

by Sasha Levin

Subject: FAILED: Patch "block: Fix page refcounts for unaligned buffers in __bio_release_pages()" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 38b43539d64b2fa020b3b9a752a986769f87f7a6 Mon Sep 17 00:00:00 2001
From: Tony Battersby <[email protected]>
Date: Thu, 29 Feb 2024 13:08:09 -0500
Subject: [PATCH] block: Fix page refcounts for unaligned buffers in
__bio_release_pages()

Fix an incorrect number of pages being released for buffers that do not
start at the beginning of a page.

Fixes: 1b151e2435fc ("block: Remove special-casing of compound pages")
Cc: [email protected]
Signed-off-by: Tony Battersby <[email protected]>
Tested-by: Greg Edwards <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
---
block/bio.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 496867b51609f..a8b6919400270 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1153,7 +1153,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty)

bio_for_each_folio_all(fi, bio) {
struct page *page;
- size_t done = 0;
+ size_t nr_pages;

if (mark_dirty) {
folio_lock(fi.folio);
@@ -1161,10 +1161,11 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty)
folio_unlock(fi.folio);
}
page = folio_page(fi.folio, fi.offset / PAGE_SIZE);
+ nr_pages = (fi.offset + fi.length - 1) / PAGE_SIZE -
+ fi.offset / PAGE_SIZE + 1;
do {
bio_release_page(bio, page++);
- done += PAGE_SIZE;
- } while (done < fi.length);
+ } while (--nr_pages != 0);
}
}
EXPORT_SYMBOL_GPL(__bio_release_pages);
--
2.43.0

2024-03-27 15:07:30

by Tony Battersby

Subject: Re: FAILED: Patch "block: Fix page refcounts for unaligned buffers in __bio_release_pages()" failed to apply to 6.1-stable tree

On 3/27/24 08:13, Sasha Levin wrote:
> The patch below does not apply to the 6.1-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <[email protected]>.
>
> Thanks,
> Sasha

I already sent a backport for 6.1 on March 13.  5.15 and older kernels
do not need the patch.

https://lore.kernel.org/stable/[email protected]/

Tony

2024-03-29 15:03:13

by Greg Kroah-Hartman

Subject: Re: FAILED: Patch "block: Fix page refcounts for unaligned buffers in __bio_release_pages()" failed to apply to 6.1-stable tree

On Wed, Mar 27, 2024 at 09:54:01AM -0400, Tony Battersby wrote:
> On 3/27/24 08:13, Sasha Levin wrote:
> > The patch below does not apply to the 6.1-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <[email protected]>.
> >
> > Thanks,
> > Sasha
>
> I already sent a backport for 6.1 on March 13.? 5.15 and older kernels
> do not need the patch.
>
> https://lore.kernel.org/stable/[email protected]/

Thanks, now queued up.

greg k-h