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 X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F95AC433E0 for ; Wed, 27 Jan 2021 09:55:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 280382072C for ; Wed, 27 Jan 2021 09:55:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235521AbhA0Jyj (ORCPT ); Wed, 27 Jan 2021 04:54:39 -0500 Received: from mx2.suse.de ([195.135.220.15]:56366 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235634AbhA0Jwa (ORCPT ); Wed, 27 Jan 2021 04:52:30 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4495CAD78; Wed, 27 Jan 2021 09:51:40 +0000 (UTC) From: Michal Rostecki Cc: Michal Rostecki , Chris Mason , Josef Bacik , David Sterba , Nikolay Borisov , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] btrfs: Avoid calling btrfs_get_chunk_map() twice Date: Wed, 27 Jan 2021 10:51:31 +0100 Message-Id: <20210127095131.22600-1-mrostecki@suse.de> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Michal Rostecki Before this change, the btrfs_get_io_geometry() function was calling btrfs_get_chunk_map() to get the extent mapping, necessary for calculating the I/O geometry. It was using that extent mapping only internally and freeing the pointer after its execution. That resulted in calling btrfs_get_chunk_map() de facto twice by the __btrfs_map_block() function. It was calling btrfs_get_io_geometry() first and then calling btrfs_get_chunk_map() directly to get the extent mapping, used by the rest of the function. This change fixes that by passing the extent mapping to the btrfs_get_io_geometry() function as an argument. Fixes: 89b798ad1b42 ("btrfs: Use btrfs_get_io_geometry appropriately") Signed-off-by: Michal Rostecki --- fs/btrfs/inode.c | 37 ++++++++++++++++++++++++++++--------- fs/btrfs/volumes.c | 39 ++++++++++++++++----------------------- fs/btrfs/volumes.h | 5 +++-- 3 files changed, 47 insertions(+), 34 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 0dbe1aaa0b71..a4ce8501ed4d 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2183,9 +2183,10 @@ int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio, struct inode *inode = page->mapping->host; struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); u64 logical = bio->bi_iter.bi_sector << 9; + struct extent_map *em; u64 length = 0; u64 map_length; - int ret; + int ret = 0; struct btrfs_io_geometry geom; if (bio_flags & EXTENT_BIO_COMPRESSED) @@ -2193,14 +2194,21 @@ int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio, length = bio->bi_iter.bi_size; map_length = length; - ret = btrfs_get_io_geometry(fs_info, btrfs_op(bio), logical, map_length, - &geom); + em = btrfs_get_chunk_map(fs_info, logical, map_length); + if (IS_ERR(em)) + return PTR_ERR(em); + ret = btrfs_get_io_geometry(fs_info, em, btrfs_op(bio), logical, + map_length, &geom); if (ret < 0) - return ret; + goto out; - if (geom.len < length + size) - return 1; - return 0; + if (geom.len < length + size) { + ret = 1; + goto out; + } +out: + free_extent_map(em); + return ret; } /* @@ -7941,10 +7949,12 @@ static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap, u64 submit_len; int clone_offset = 0; int clone_len; + int logical; int ret; blk_status_t status; struct btrfs_io_geometry geom; struct btrfs_dio_data *dio_data = iomap->private; + struct extent_map *em; dip = btrfs_create_dio_private(dio_bio, inode, file_offset); if (!dip) { @@ -7970,11 +7980,17 @@ static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap, } start_sector = dio_bio->bi_iter.bi_sector; + logical = start_sector << 9; submit_len = dio_bio->bi_iter.bi_size; do { - ret = btrfs_get_io_geometry(fs_info, btrfs_op(dio_bio), - start_sector << 9, submit_len, + em = btrfs_get_chunk_map(fs_info, logical, submit_len); + if (IS_ERR(em)) { + status = errno_to_blk_status(ret); + goto out_err; + } + ret = btrfs_get_io_geometry(fs_info, em, btrfs_op(dio_bio), + logical, submit_len, &geom); if (ret) { status = errno_to_blk_status(ret); @@ -8030,12 +8046,15 @@ static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap, clone_offset += clone_len; start_sector += clone_len >> 9; file_offset += clone_len; + + free_extent_map(em); } while (submit_len > 0); return BLK_QC_T_NONE; out_err: dip->dio_bio->bi_status = status; btrfs_dio_private_put(dip); + free_extent_map(em); return BLK_QC_T_NONE; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index a8ec8539cd8d..4c753b17c0a2 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -5940,23 +5940,24 @@ static bool need_full_stripe(enum btrfs_map_op op) } /* - * btrfs_get_io_geometry - calculates the geomery of a particular (address, len) + * btrfs_get_io_geometry - calculates the geometry of a particular (address, len) * tuple. This information is used to calculate how big a * particular bio can get before it straddles a stripe. * - * @fs_info - the filesystem - * @logical - address that we want to figure out the geometry of - * @len - the length of IO we are going to perform, starting at @logical - * @op - type of operation - write or read - * @io_geom - pointer used to return values + * @fs_info: the filesystem + * @em: mapping containing the logical extent + * @op: type of operation - write or read + * @logical: address that we want to figure out the geometry of + * @len: the length of IO we are going to perform, starting at @logical + * @io_geom: pointer used to return values * * Returns < 0 in case a chunk for the given logical address cannot be found, * usually shouldn't happen unless @logical is corrupted, 0 otherwise. */ -int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, - u64 logical, u64 len, struct btrfs_io_geometry *io_geom) +int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *em, + enum btrfs_map_op op, u64 logical, u64 len, + struct btrfs_io_geometry *io_geom) { - struct extent_map *em; struct map_lookup *map; u64 offset; u64 stripe_offset; @@ -5964,14 +5965,9 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, u64 stripe_len; u64 raid56_full_stripe_start = (u64)-1; int data_stripes; - int ret = 0; ASSERT(op != BTRFS_MAP_DISCARD); - em = btrfs_get_chunk_map(fs_info, logical, len); - if (IS_ERR(em)) - return PTR_ERR(em); - map = em->map_lookup; /* Offset of this logical address in the chunk */ offset = logical - em->start; @@ -5985,8 +5981,7 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, btrfs_crit(fs_info, "stripe math has gone wrong, stripe_offset=%llu offset=%llu start=%llu logical=%llu stripe_len=%llu", stripe_offset, offset, em->start, logical, stripe_len); - ret = -EINVAL; - goto out; + return -EINVAL; } /* stripe_offset is the offset of this block in its stripe */ @@ -6033,10 +6028,7 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, io_geom->stripe_offset = stripe_offset; io_geom->raid56_stripe_offset = raid56_full_stripe_start; -out: - /* once for us */ - free_extent_map(em); - return ret; + return 0; } static int __btrfs_map_block(struct btrfs_fs_info *fs_info, @@ -6069,12 +6061,13 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, ASSERT(bbio_ret); ASSERT(op != BTRFS_MAP_DISCARD); - ret = btrfs_get_io_geometry(fs_info, op, logical, *length, &geom); + em = btrfs_get_chunk_map(fs_info, logical, *length); + ASSERT(!IS_ERR(em)); + + ret = btrfs_get_io_geometry(fs_info, em, op, logical, *length, &geom); if (ret < 0) return ret; - em = btrfs_get_chunk_map(fs_info, logical, *length); - ASSERT(!IS_ERR(em)); map = em->map_lookup; *length = geom.len; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index c43663d9c22e..04e2b26823c2 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -440,8 +440,9 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, u64 logical, u64 *length, struct btrfs_bio **bbio_ret); -int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, - u64 logical, u64 len, struct btrfs_io_geometry *io_geom); +int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map, + enum btrfs_map_op op, u64 logical, u64 len, + struct btrfs_io_geometry *io_geom); int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type); -- 2.30.0