From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp1040.oracle.com ([141.146.126.69]:33160 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753412Ab3A1EEd (ORCPT ); Sun, 27 Jan 2013 23:04:33 -0500 From: Anand Jain To: linux-btrfs@vger.kernel.org, dsterba@suse.cz, gene@czarc.net Subject: [PATCH 05/10] Btrfs-progs: add function btrfs_get_subvol to get root_info of a subvol Date: Mon, 28 Jan 2013 12:10:23 +0800 Message-Id: <1359346228-24804-6-git-send-email-anand.jain@oracle.com> In-Reply-To: <1359346228-24804-1-git-send-email-anand.jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: References: <1359346228-24804-1-git-send-email-anand.jain@oracle.com> We need a function which can get the root_info of a given subvol. This is in preparation to add support for the show sub-cli. Signed-off-by: Anand Jain --- btrfs-list.c | 38 ++++++++++++++++++++++++++++++++++++++ btrfs-list.h | 1 + 2 files changed, 39 insertions(+) diff --git a/btrfs-list.c b/btrfs-list.c index 909d814..0ee13b6 100644 --- a/btrfs-list.c +++ b/btrfs-list.c @@ -1453,6 +1453,44 @@ int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set, return 0; } +int btrfs_get_subvol(int fd, struct root_info *the_ri) +{ + int ret = -1; + struct root_lookup rl; + struct rb_node *rbn; + struct root_info *ri; + u64 root_id = btrfs_list_get_path_rootid(fd); + + if (btrfs_list_subvols(fd, &rl)) + return 1; + + rbn = rb_first(&rl.root); + while(rbn) { + ri = rb_entry(rbn, struct root_info, rb_node); + resolve_root(&rl, ri, root_id); + if (!comp_entry_with_rootid(the_ri, ri, 0)) { + memcpy(the_ri, ri, offsetof(struct root_info, path)); + if (ri->path) + the_ri->path = strdup(ri->path); + else + the_ri->path = NULL; + if (ri->name) + the_ri->name = strdup(ri->name); + else + the_ri->name = NULL; + if (ri->full_path) + the_ri->full_path = strdup(ri->full_path); + else + the_ri->name = NULL; + ret = 0; + break; + } + rbn = rb_next(rbn); + } + __free_all_subvolumn(&rl); + return ret; +} + static int print_one_extent(int fd, struct btrfs_ioctl_search_header *sh, struct btrfs_file_extent_item *item, u64 found_gen, u64 *cache_dirid, diff --git a/btrfs-list.h b/btrfs-list.h index 3b7b680..580d4d1 100644 --- a/btrfs-list.h +++ b/btrfs-list.h @@ -151,3 +151,4 @@ int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen); int btrfs_list_get_default_subvolume(int fd, u64 *default_id); char *btrfs_list_path_for_root(int fd, u64 root); u64 btrfs_list_get_path_rootid(int fd); +int btrfs_get_subvol(int fd, struct root_info *the_ri); -- 1.8.1.227.g44fe835