From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2120.oracle.com ([156.151.31.85]:52852 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752913AbeAEUyK (ORCPT ); Fri, 5 Jan 2018 15:54:10 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.21/8.16.0.21) with SMTP id w05Kqdpe146657 for ; Fri, 5 Jan 2018 20:54:09 GMT Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp2120.oracle.com with ESMTP id 2fag5k06ee-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 05 Jan 2018 20:54:09 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w05Ks9sx000454 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Fri, 5 Jan 2018 20:54:09 GMT Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w05Ks8R8027708 for ; Fri, 5 Jan 2018 20:54:09 GMT From: Liu Bo To: linux-btrfs@vger.kernel.org Subject: [PATCH v2 03/10] Btrfs: add helper for em merge logic Date: Fri, 5 Jan 2018 12:51:10 -0700 Message-Id: <20180105195117.5131-4-bo.li.liu@oracle.com> In-Reply-To: <20180105195117.5131-1-bo.li.liu@oracle.com> References: <20180105195117.5131-1-bo.li.liu@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a prepare work for the following extent map selftest, which runs tests against em merge logic. Signed-off-by: Liu Bo --- fs/btrfs/ctree.h | 2 ++ fs/btrfs/inode.c | 80 ++++++++++++++++++++++++++++++++------------------------ 2 files changed, 48 insertions(+), 34 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b2e09fe..328f40f 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3148,6 +3148,8 @@ struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, int delay_iput); void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work); +int btrfs_add_extent_mapping(struct extent_map_tree *em_tree, + struct extent_map **em_in, u64 start, u64 len); struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode, struct page *page, size_t pg_offset, u64 start, u64 len, int create); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a270fe2..876118c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6911,6 +6911,51 @@ static noinline int uncompress_inline(struct btrfs_path *path, return ret; } +int btrfs_add_extent_mapping(struct extent_map_tree *em_tree, + struct extent_map **em_in, u64 start, u64 len) +{ + int ret; + struct extent_map *em = *em_in; + + ret = add_extent_mapping(em_tree, em, 0); + /* it is possible that someone inserted the extent into the tree + * while we had the lock dropped. It is also possible that + * an overlapping map exists in the tree + */ + if (ret == -EEXIST) { + struct extent_map *existing; + + ret = 0; + + existing = search_extent_mapping(em_tree, start, len); + /* + * existing will always be non-NULL, since there must be + * extent causing the -EEXIST. + */ + if (start >= existing->start && + start < extent_map_end(existing)) { + free_extent_map(em); + *em_in = existing; + ret = 0; + } else { + /* + * The existing extent map is the one nearest to + * the [start, start + len) range which overlaps + */ + ret = merge_extent_mapping(em_tree, existing, + em, start); + free_extent_map(existing); + if (ret) { + free_extent_map(em); + *em_in = NULL; + } + } + } + + ASSERT(ret == 0 || ret == -EEXIST); + return ret; +} + /* * a bit scary, this does extent mapping from logical file offset to the disk. * the ugly parts come from merging extents from the disk with the in-ram @@ -7147,40 +7192,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, err = 0; write_lock(&em_tree->lock); - ret = add_extent_mapping(em_tree, em, 0); - /* it is possible that someone inserted the extent into the tree - * while we had the lock dropped. It is also possible that - * an overlapping map exists in the tree - */ - if (ret == -EEXIST) { - struct extent_map *existing; - - ret = 0; - - existing = search_extent_mapping(em_tree, start, len); - /* - * existing will always be non-NULL, since there must be - * extent causing the -EEXIST. - */ - if (start >= existing->start && - start < extent_map_end(existing)) { - free_extent_map(em); - em = existing; - err = 0; - } else { - /* - * The existing extent map is the one nearest to - * the [start, start + len) range which overlaps - */ - err = merge_extent_mapping(em_tree, existing, - em, start); - free_extent_map(existing); - if (err) { - free_extent_map(em); - em = NULL; - } - } - } + err = btrfs_add_extent_mapping(em_tree, &em, start, len); write_unlock(&em_tree->lock); out: -- 2.9.4