The patch below does not apply to the 4.19-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 stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x 844545c51a5b2a524b22a2fe9d0b353b827d24b4 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '1678109703254217@kroah.com' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

844545c51a5b ("f2fs: fix cgroup writeback accounting with fs-layer encryption") 9637d517347e ("Merge tag 'for-linus-20190715' of git://git.kernel.dk/linux-block")

thanks,

greg k-h

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

From 844545c51a5b2a524b22a2fe9d0b353b827d24b4 Mon Sep 17 00:00:00 2001 From: Eric Biggers ebiggers@google.com Date: Thu, 2 Feb 2023 17:02:39 -0800 Subject: [PATCH] f2fs: fix cgroup writeback accounting with fs-layer encryption

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@vger.kernel.org Reported-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: Eric Biggers ebiggers@google.com Acked-by: Tejun Heo tj@kernel.org Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 754841bce389..8a636500db0e 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -739,7 +739,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio) }

if (fio->io_wbc && !is_read_io(fio->op)) - wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE); + wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);

inc_page_count(fio->sbi, is_read_io(fio->op) ? __read_io_type(page) : WB_DATA_TYPE(fio->page)); @@ -949,7 +949,7 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio) }

if (fio->io_wbc) - wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE); + wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);

inc_page_count(fio->sbi, WB_DATA_TYPE(page));

@@ -1023,7 +1023,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) }

if (fio->io_wbc) - wbc_account_cgroup_owner(fio->io_wbc, bio_page, PAGE_SIZE); + wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);

io->last_block_in_bio = fio->new_blkaddr;