From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF900C433F5 for ; Thu, 31 Mar 2022 15:35:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239184AbiCaPhd (ORCPT ); Thu, 31 Mar 2022 11:37:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238625AbiCaPg1 (ORCPT ); Thu, 31 Mar 2022 11:36:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8AA72296DD; Thu, 31 Mar 2022 08:32:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 41D9CB82172; Thu, 31 Mar 2022 15:32:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C0E0C340ED; Thu, 31 Mar 2022 15:32:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648740737; bh=FmX4ksKit3n5v2Ma3YmkboXL+/Iat3tSFVX5rVU3g3k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FRdWs7G6JjmNJ0pgbyZebtOBq97wPC8oKEa2f8GklJlLP8kbnQV6ZS7JGeqU9OApp T7pszn9RuGc20nLC63gmoT466QW2SR5UjiMJ+git0xo5UTdTwr17RyaQAkt4WuLClw d+0iDbCDvjPURG5QFRWJrKiWgxcgesIWJuZ2W1mCAkUf3rg/1b3aZarMUypocwd/Uo Ig3eAuBlrOY4KiMJyNBFkWSWauuVYovB2R6IEf7ocBYdV4VAvFZgyO/X9nNok51yyd j4vLl0/NUdSgud9xXKimhdq6v2vkNW6YXhvAfNbd3ebmtLhfq1f0wgqANwqqTmoQW3 nXxHRWeX+nJuw== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: xiubli@redhat.com, idryomov@gmail.com, lhenriques@suse.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v12 50/54] ceph: plumb in decryption during sync reads Date: Thu, 31 Mar 2022 11:31:26 -0400 Message-Id: <20220331153130.41287-51-jlayton@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220331153130.41287-1-jlayton@kernel.org> References: <20220331153130.41287-1-jlayton@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Switch to using sparse reads when the inode is encrypted. Note that the crypto block may be smaller than a page, but the reverse cannot be true. Signed-off-by: Jeff Layton --- fs/ceph/file.c | 89 ++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 65 insertions(+), 24 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index aaa7a9d0c439..5072570c2203 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -940,7 +940,7 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, u64 off = *ki_pos; u64 len = iov_iter_count(to); u64 i_size = i_size_read(inode); - bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD); + bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD); u64 objver = 0; dout("sync_read on inode %p %llx~%llx\n", inode, *ki_pos, len); @@ -968,10 +968,19 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, int idx; size_t left; struct ceph_osd_req_op *op; + u64 read_off = off; + u64 read_len = len; + + /* determine new offset/length if encrypted */ + ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len); + + dout("sync_read orig %llu~%llu reading %llu~%llu", + off, len, read_off, read_len); req = ceph_osdc_new_request(osdc, &ci->i_layout, - ci->i_vino, off, &len, 0, 1, - sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ, + ci->i_vino, read_off, &read_len, 0, 1, + sparse ? CEPH_OSD_OP_SPARSE_READ : + CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq, ci->i_truncate_size, false); @@ -980,10 +989,13 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } + /* adjust len downward if the request truncated the len */ + if (off + len > read_off + read_len) + len = read_off + read_len - off; more = len < iov_iter_count(to); - num_pages = calc_pages_for(off, len); - page_off = off & ~PAGE_MASK; + num_pages = calc_pages_for(read_off, read_len); + page_off = offset_in_page(off); pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); if (IS_ERR(pages)) { ceph_osdc_put_request(req); @@ -991,7 +1003,8 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } - osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, + osd_req_op_extent_osd_data_pages(req, 0, pages, read_len, + offset_in_page(read_off), false, false); op = &req->r_ops[0]; @@ -1010,7 +1023,7 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency, req->r_end_latency, - len, ret); + read_len, ret); if (ret > 0) objver = req->r_version; @@ -1025,8 +1038,34 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, else if (ret == -ENOENT) ret = 0; + if (ret > 0 && IS_ENCRYPTED(inode)) { + int fret; + + fret = ceph_fscrypt_decrypt_extents(inode, pages, read_off, + op->extent.sparse_ext, op->extent.sparse_ext_cnt); + if (fret < 0) { + ret = fret; + ceph_osdc_put_request(req); + break; + } + + /* account for any partial block at the beginning */ + fret -= (off - read_off); + + /* + * Short read after big offset adjustment? + * Nothing is usable, just call it a zero + * len read. + */ + fret = max(fret, 0); + + /* account for partial block at the end */ + ret = min_t(ssize_t, fret, len); + } + ceph_osdc_put_request(req); + /* Short read but not EOF? Zero out the remainder. */ if (ret >= 0 && ret < len && (off + ret < i_size)) { int zlen = min(len - ret, i_size - off - ret); int zoff = page_off + ret; @@ -1040,15 +1079,16 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, idx = 0; left = ret > 0 ? ret : 0; while (left > 0) { - size_t len, copied; - page_off = off & ~PAGE_MASK; - len = min_t(size_t, left, PAGE_SIZE - page_off); + size_t plen, copied; + + plen = min_t(size_t, left, PAGE_SIZE - page_off); SetPageUptodate(pages[idx]); copied = copy_page_to_iter(pages[idx++], - page_off, len, to); + page_off, plen, to); off += copied; left -= copied; - if (copied < len) { + page_off = 0; + if (copied < plen) { ret = -EFAULT; break; } @@ -1065,20 +1105,21 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } - if (off > *ki_pos) { - if (off >= i_size) { - *retry_op = CHECK_EOF; - ret = i_size - *ki_pos; - *ki_pos = i_size; - } else { - ret = off - *ki_pos; - *ki_pos = off; + if (ret > 0) { + if (off > *ki_pos) { + if (off >= i_size) { + *retry_op = CHECK_EOF; + ret = i_size - *ki_pos; + *ki_pos = i_size; + } else { + ret = off - *ki_pos; + *ki_pos = off; + } } - } - - if (last_objver && ret > 0) - *last_objver = objver; + if (last_objver) + *last_objver = objver; + } dout("sync_read result %zd retry_op %d\n", ret, *retry_op); return ret; } -- 2.35.1