From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D1B4528152D; Mon, 5 May 2025 23:05:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486300; cv=none; b=cucn9cSk9+86ykXEZ1CyLU1+Uf4rDkFHDoIFQFrGpgelu46K5T76qsBb1uZH/2OvshWSZpnRxlliiFJiz0rFFVMLhI9NyR2w7/xj2Rp/Qq6I8TK8Z0+jqDg00uqMRsXKO+QRWrMzxlOTTqZklCHLqE6g/nAZfwoEWT6ncXVks9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486300; c=relaxed/simple; bh=mEdk8wNwFMaBiA/xZ4GWQaf/cVHfpSJsFqr1MvmX5U8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DeYDNNlU4WfofpuSJK0fjUGQl99eRqu1fpfNXi6zGZ8US9nohSVbBsDgkuYWTMdTtNhJaNyxfyurI3Ucx5CdJeSuHbwdrz7v0bZeXo841AekZyyg1B24Lkw1iottLTa4kXCzW76CAShs1cApsYJtLFAj6yJJlo6TG4Pr3Yt/Qs8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eLy9c0Xf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eLy9c0Xf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B227CC4CEEF; Mon, 5 May 2025 23:04:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746486300; bh=mEdk8wNwFMaBiA/xZ4GWQaf/cVHfpSJsFqr1MvmX5U8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eLy9c0Xfxe1ySbGjGK3cYnHEXZmEF/B1xnwdZhnQH97i5rEIM/rkrxJXjSqgoTVrv K1LLv6z2tm2TzWDCsa0nUKwOHPXYgs6Uv5iwRzrmmd48c1UDtnM4J5ZpHldXqIB+4K WRhxSU/kyke5BX8uTkq2cYLyfKV5hNll0Ng1pYO/dpg6y/Pb+Y5J3VwH1zl1ndUOwQ kmMZs+C6nPsXaFgLaEpRD90IpBSUSOA/qR+hOQ0Fx4tY33uh/Xxzd5cVm4Air1sUt6 fzgCX3KM/zbeynu6Tq0ttwA4pv1QqXth6deI9eUJ/Kt02P7vtKRr017MUmXKcz4v4K Y6L0Uwiyk+gsw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zhang Yi , Jan Kara , Ojaswin Mujoo , Theodore Ts'o , Sasha Levin , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 6.6 246/294] ext4: don't write back data before punch hole in nojournal mode Date: Mon, 5 May 2025 18:55:46 -0400 Message-Id: <20250505225634.2688578-246-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505225634.2688578-1-sashal@kernel.org> References: <20250505225634.2688578-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.89 Content-Transfer-Encoding: 8bit From: Zhang Yi [ Upstream commit 43d0105e2c7523cc6b14cad65e2044e829c0a07a ] There is no need to write back all data before punching a hole in non-journaled mode since it will be dropped soon after removing space. Therefore, the call to filemap_write_and_wait_range() can be eliminated. Besides, similar to ext4_zero_range(), we must address the case of partially punched folios when block size < page size. It is essential to remove writable userspace mappings to ensure that the folio can be faulted again during subsequent mmap write access. In journaled mode, we need to write dirty pages out before discarding page cache in case of crash before committing the freeing data transaction, which could expose old, stale data, even if synchronization has been performed. Signed-off-by: Zhang Yi Reviewed-by: Jan Kara Reviewed-by: Ojaswin Mujoo Link: https://patch.msgid.link/20241220011637.1157197-4-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/inode.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d3d28e6587202..456f686136fc5 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3946,17 +3946,6 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) trace_ext4_punch_hole(inode, offset, length, 0); - /* - * Write out all dirty pages to avoid race conditions - * Then release them. - */ - if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { - ret = filemap_write_and_wait_range(mapping, offset, - offset + length - 1); - if (ret) - return ret; - } - inode_lock(inode); /* No need to punch hole beyond i_size */ @@ -4018,8 +4007,11 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) ret = ext4_update_disksize_before_punch(inode, offset, length); if (ret) goto out_dio; - truncate_pagecache_range(inode, first_block_offset, - last_block_offset); + + ret = ext4_truncate_page_cache_block_range(inode, + first_block_offset, last_block_offset + 1); + if (ret) + goto out_dio; } if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) -- 2.39.5