From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:28975 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933433AbcJRAfu (ORCPT ); Mon, 17 Oct 2016 20:35:50 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u9I0Zn7v022143 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 18 Oct 2016 00:35:50 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0022.oracle.com (8.14.4/8.13.8) with ESMTP id u9I0ZnBE031327 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 18 Oct 2016 00:35:49 GMT Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id u9I0ZnnR027403 for ; Tue, 18 Oct 2016 00:35:49 GMT From: Divya Indi To: linux-btrfs@vger.kernel.org Cc: ashish.samant@oracle.com, bo.li.liu@oracle.com Subject: [PATCH 1/3] btrfs-progs: Generic functions to retrieve chunks and their bg info Date: Mon, 17 Oct 2016 17:35:13 -0700 Message-Id: <1476750915-3105-2-git-send-email-divya.indi@oracle.com> In-Reply-To: <1476750915-3105-1-git-send-email-divya.indi@oracle.com> References: <1476750915-3105-1-git-send-email-divya.indi@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: An efficient alternative to retrieving block groups: get_chunks(): Walk the chunk tree to retrieve the chunks. get_bg_info(): For each retrieved chunk, lookup an exact match of block group in the extent tree. Signed-off-by: Divya Indi Reviewed-by: Ashish Samant Reviewed-by: Liu Bo --- cmds-inspect.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 66 insertions(+), 0 deletions(-) diff --git a/cmds-inspect.c b/cmds-inspect.c index 4b7cea0..f435ea9 100644 --- a/cmds-inspect.c +++ b/cmds-inspect.c @@ -81,6 +81,72 @@ out: return !!ret; } +static void bg_flags_to_str(u64 flags, char *ret) +{ + int empty = 1; + + if (flags & BTRFS_BLOCK_GROUP_DATA) { + empty = 0; + strcpy(ret, "DATA"); + } + if (flags & BTRFS_BLOCK_GROUP_METADATA) { + if (!empty) + strcat(ret, "|"); + strcat(ret, "METADATA"); + } + if (flags & BTRFS_BLOCK_GROUP_SYSTEM) { + if (!empty) + strcat(ret, "|"); + strcat(ret, "SYSTEM"); + } +} + +/* Walking through the chunk tree to retrieve chunks. */ + +static int get_chunks(int fd, struct btrfs_ioctl_search_args *chunk_args) +{ + struct btrfs_ioctl_search_key *sk; + int ret; + int e; + + sk = &chunk_args->key; + + sk->tree_id = BTRFS_CHUNK_TREE_OBJECTID; + sk->min_objectid = sk->max_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + sk->max_type = sk->min_type = BTRFS_CHUNK_ITEM_KEY; + sk->nr_items = 4096; + + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, chunk_args); + e = errno; + if (ret < 0) { + fprintf(stderr, "ret %d error '%s'\n", ret, + strerror(e)); + } + return ret; +} + +/* Given the objectid, find the block group item in the extent tree */ +static int get_bg_info(int fd, struct btrfs_ioctl_search_args *bg_args, + u64 objectid, unsigned long length) +{ + struct btrfs_ioctl_search_key *bg_sk; + int ret; + int e; + + bg_sk = &bg_args->key; + + bg_sk->min_objectid = bg_sk->max_objectid = objectid; + bg_sk->nr_items = 1; + bg_sk->min_offset = bg_sk->max_offset = length; + + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, bg_args); + e = errno; + if (ret < 0) { + fprintf(stderr, "ret %d error '%s'\n", ret, + strerror(e)); + } + return ret; +} static const char * const cmd_inspect_inode_resolve_usage[] = { "btrfs inspect-internal inode-resolve [-v] ", "Get file system paths for the given inode", -- 1.7.1