This is a note to let you know that I've just added the patch titled
f2fs: fix cgroup writeback accounting with fs-layer encryption
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
f2fs-fix-cgroup-writeback-accounting-with-fs-layer-encryption.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 844545c51a5b2a524b22a2fe9d0b353b827d24b4 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Thu, 2 Feb 2023 17:02:39 -0800
Subject: f2fs: fix cgroup writeback accounting with fs-layer encryption
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit 844545c51a5b2a524b22a2fe9d0b353b827d24b4 upstream.
When writing a page from an encrypted file that is using
filesystem-layer encryption (not inline encryption), f2fs encrypts the
pagecache page into a bounce page, then writes the bounce page.
It also passes the bounce page to wbc_account_cgroup_owner(). That's
incorrect, because the bounce page is a newly allocated temporary page
that doesn't have the memory cgroup of the original pagecache page.
This makes wbc_account_cgroup_owner() not account the I/O to the owner
of the pagecache page as it should.
Fix this by always passing the pagecache page to
wbc_account_cgroup_owner().
Fixes: 578c647879f7 ("f2fs: implement cgroup writeback support")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/f2fs/data.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -464,7 +464,7 @@ int f2fs_submit_page_bio(struct f2fs_io_
}
if (fio->io_wbc && !is_read_io(fio->op))
- wbc_account_io(fio->io_wbc, page, PAGE_SIZE);
+ wbc_account_io(fio->io_wbc, fio->page, PAGE_SIZE);
bio_set_op_attrs(bio, fio->op, fio->op_flags);
@@ -533,7 +533,7 @@ alloc_new:
}
if (fio->io_wbc)
- wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE);
+ wbc_account_io(fio->io_wbc, fio->page, PAGE_SIZE);
io->last_block_in_bio = fio->new_blkaddr;
f2fs_trace_ios(fio, 0);
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-4.19/f2fs-fix-cgroup-writeback-accounting-with-fs-layer-encryption.patch
queue-4.19/f2fs-fix-information-leak-in-f2fs_move_inline_dirents.patch
queue-4.19/lib-mpi-fix-buffer-overrun-when-sg-is-too-long.patch
