From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794049539; b=I8DzVACYpzoNjkUoe34pl/Pbfev5JgtVLg2ZkuNEz3bFP3I+EilIuIHcdSb/iptb3l1F uO4gSFb++4wcW87F4JVrhmWsv3wn6PWZOyOvMbJmAFTOY+dhM76UaO47CrCHu1wubvETP uBDXNQJQMPh+u0RYD7nTEpF6HEwrwX9uYD1rKu/6Yg/TZGLE5CDw/mauEar5HrL12fQCL dmbf25Hea1VWw5vCEdkgz2jiZ4rnvffM6s0wAxOWsE+OVFLxnOTtIFSjNXBCtRHhGlDLa M8YVlpLeOZ0qF3/oOrDP5P9yNXkbZpczKShHIdIFzAAy3eKQ7NUd2rfR8qDpoUV8VDQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794049539; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=d7zssbOY50KZlDRY6sGZ6nW9FmlaKKbB/IAPScrZnHE=; b=KZ0v/vvbrGAai4/4mRoQF2qilbkDEwJBJryIQa+tcPZXLVGO+awMbfPU/0QFoB1Tdofp SZhG2X9pF8OMNMZi5+INz0yq+Uh9z1x3x9UKma+AjOGbl8CW/yPofR2kfEJEeqT18E3Iu wLLIOzOK7UsG2mZCasM2RRvIu4x3lpaKP+rp705VlTM4b64FdVe7OfxVEZ4+5hmfykWyk H2ZTIuJNGh5bp6SPvJW1AFkdTfBaJNYBBH8i34+mlIsx/JFATXWwKkRzMAODSVePpPXDw C8IUzRUUpY+sYUwOx/l81MerhOpAGfP/dy9c4FjZ8jFoXgXcDMxs9pRMOIxT+YK6m8A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=k8r10tOx; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69DDD606A32C for ; Sat, 7 Nov 2026 11:05:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=k8r10tOx Received: by smtp.kernel.org (Postfix) with ESMTPSA id B24671F0089F; Sat, 7 Nov 2026 11:05:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794049539; bh=d7zssbOY50KZlDRY6sGZ6nW9FmlaKKbB/IAPScrZnHE=; h=From:To:Cc:Subject:Date; b=k8r10tOxIGgeKBtI/dX37jJb5/Fpmel5UEZbpQNFrFvwb8UnbxcG24T1Lwk2IoX+5 iHTtT2YmXTCsZZZ39jiRf48NxvBpl+XqOKWR6h4oA4I6mSG3rAqtc8m2wgQdtSrVj+ Ff/rXsryfc+FN37BEaI3c01RZW4t03orva//D0OhAiCr6MEabnt0R5MZpatsJHmWE5 Y4mCFHiaQDBfOOUjVlqeu6JTEqwW5UizE+rchYsklyOslo/pqD7uH8WOs35iJZRBZh Y9Z2SGKcLs7lnJ1Yj4T+Ir6HlcZm+EZ3O5rpf5dt6D7xFHaelIxeZf8MXiVKom5bW0 399VQX3EKmmwA== From: Sasha Levin To: zhaonanzhe@xiaomi.com, chao@kernel.org, baohua@kernel.org, jaegeuk@kernel.org Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] f2fs: remove mappedtodisk flag usage in mmap write path" failed to apply to 5.15-stable tree Date: Sat, 7 Nov 2026 06:05:37 -0500 Message-ID: <20261107060537-failed-5.15-b3c984358925@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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 . 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-5.15.y git checkout FETCH_HEAD git cherry-pick -x b3c9843589257631bac18f30655e82d88970688a # git commit -s git send-email --to '' --in-reply-to '20261107060537-failed-5.15-b3c984358925@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From b3c9843589257631bac18f30655e82d88970688a Mon Sep 17 00:00:00 2001 From: Nanzhe Zhao Date: Mon, 12 Oct 2026 11:03:15 +0800 Subject: [PATCH] f2fs: remove mappedtodisk flag usage in mmap write path PG_mappedtodisk was inherited from the nobh/buffer-head era. However, f2fs has no buffer heads and the flag is no longer meaningful. The only user of the flag is the "no holes" shortcut in f2fs_vm_page_mkwrite(), which makes mmap write faults skip marking the folio dirty. Moreover, it causes the following race condition with filesystem freezing: CPU0 (write fault) CPU1 (freeze_super) ---- ---- f2fs_vm_page_mkwrite() sb_start_pagefault() /* shortcut: no dirty */ sb_end_pagefault() sb_wait_write(SB_FREEZE_PAGEFAULT) /* no waiter, passes */ sync_filesystem() /* folio not dirty, skipped */ finish_fault() /* PTE writable */ fault_dirty_shared_page() folio_mark_dirty() /* dirty folio on a frozen fs */ It will also skip APP_MAPPED_IO iostat/REQ_TIME updates and post-EOF folio zeroing. Remove this shortcut in f2fs_vm_page_mkwrite() and stop setting it in f2fs_read_single_page(). Reported-by: Chao Yu Link: https://lore.kernel.org/linux-f2fs-devel/496b913c-eb81-4fa8-be72-c6a06a10aba2@kernel.org/ Reviewed-by: Chao Yu Reviewed-by: Barry Song Fixes: fbfa2cc58d53 ("f2fs: add file operations") Cc: stable@vger.kernel.org Signed-off-by: Nanzhe Zhao Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 1 - fs/f2fs/file.c | 6 ------ 2 files changed, 7 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 2613e8821af6d..348ddc8b748c5 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2494,7 +2494,6 @@ static int f2fs_read_single_page(struct inode *inode, struct fsverity_info *vi, got_it: if ((map->m_flags & F2FS_MAP_MAPPED)) { block_nr = map->m_pblk + block_in_file - map->m_lblk; - folio_set_mappedtodisk(folio); if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr, DATA_GENERIC_ENHANCE_READ)) { diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index ef4d218e694bd..4363e28056e6b 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -218,12 +218,6 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) /* wait for GCed page writeback via generic cache */ f2fs_wait_on_block_writeback(inode, dn.data_blkaddr); - /* - * check to see if the page is mapped already (no holes) - */ - if (folio_test_mappedtodisk(folio)) - goto out_sem; - /* page is wholly or partially inside EOF */ if (((loff_t)(folio->index + 1) << PAGE_SHIFT) > i_size_read(inode)) { -- 2.53.0