From patchwork Fri Nov 16 04:52:26 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anand Jain X-Patchwork-Id: 1752851 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 52665DF288 for ; Fri, 16 Nov 2012 04:48:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751440Ab2KPEr7 (ORCPT ); Thu, 15 Nov 2012 23:47:59 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:20332 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750960Ab2KPEr6 (ORCPT ); Thu, 15 Nov 2012 23:47:58 -0500 Received: from ucsinet21.oracle.com (ucsinet21.oracle.com [156.151.31.93]) by userp1040.oracle.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id qAG4lvZm014776 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 16 Nov 2012 04:47:57 GMT Received: from acsmt357.oracle.com (acsmt357.oracle.com [141.146.40.157]) by ucsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id qAG4luII027953 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 16 Nov 2012 04:47:56 GMT Received: from abhmt103.oracle.com (abhmt103.oracle.com [141.146.116.55]) by acsmt357.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id qAG4lu8n003972 for ; Thu, 15 Nov 2012 22:47:56 -0600 Received: from localhost.localdomain (/10.186.101.18) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 15 Nov 2012 20:47:55 -0800 From: Anand jain To: linux-btrfs@vger.kernel.org Subject: [PATCH 2/3] Btrfs-progs: add feature to label subvol and snapshot Date: Fri, 16 Nov 2012 12:52:26 +0800 Message-Id: <1353041547-10088-4-git-send-email-Anand.Jain@oracle.com> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1353041547-10088-1-git-send-email-Anand.Jain@oracle.com> References: <1351766770-4044-1-git-send-email-Anand.Jain@oracle.com> <1353041547-10088-1-git-send-email-Anand.Jain@oracle.com> X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Anand Jain Signed-off-by: Anand Jain --- btrfslabel.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ btrfslabel.h | 4 +++- ctree.h | 4 +++- ioctl.h | 2 ++ print-tree.c | 2 ++ 5 files changed, 55 insertions(+), 2 deletions(-) diff --git a/btrfslabel.c b/btrfslabel.c index cb142b0..e161af1 100644 --- a/btrfslabel.c +++ b/btrfslabel.c @@ -126,3 +126,48 @@ int set_label(char *btrfs_dev, char *nLabel) change_label_unmounted(btrfs_dev, nLabel); return 0; } + +int get_subvol_label(char *subvol, char *labelp) +{ + int fd, e=0; + + fd = open_file_or_dir(subvol); + + if(ioctl(fd, BTRFS_IOC_SUBVOL_GETLABEL, labelp) < 0) { + e = errno; + fprintf(stderr, "ERROR: get subvol label failed, %s\n", + strerror(e)); + close(fd); + return -e; + } + labelp[BTRFS_LABEL_SIZE] = '\0'; + if (!strlen(labelp)) + return -1; + close(fd); + return 0; +} + +int set_subvol_label(char *subvol, char *labelp) +{ + int fd, e=0; + char label[BTRFS_SUBVOL_LABEL_SIZE+1]; + + if (strlen(labelp) > BTRFS_SUBVOL_LABEL_SIZE) { + fprintf(stderr, "ERROR: Subvol label is more than max length %d\n", + BTRFS_SUBVOL_LABEL_SIZE); + return -1; + } + memset(label, 0, BTRFS_SUBVOL_LABEL_SIZE+1); + strcpy(label, labelp); + fd = open_file_or_dir(subvol); + + if(ioctl(fd, BTRFS_IOC_SUBVOL_SETLABEL, label) < 0) { + e = errno; + fprintf(stderr, "ERROR: set subvol label failed, %s\n", + strerror(e)); + close(fd); + return -e; + } + close(fd); + return 0; +} diff --git a/btrfslabel.h b/btrfslabel.h index abf43ad..1abc483 100644 --- a/btrfslabel.h +++ b/btrfslabel.h @@ -2,4 +2,6 @@ int get_label(char *btrfs_dev); -int set_label(char *btrfs_dev, char *nLabel); \ No newline at end of file +int set_label(char *btrfs_dev, char *nLabel); +int get_subvol_label(char *subvol, char *labelp); +int set_subvol_label(char *subvol, char *labelp); diff --git a/ctree.h b/ctree.h index 293b24f..68bae28 100644 --- a/ctree.h +++ b/ctree.h @@ -325,6 +325,7 @@ struct btrfs_header { */ #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 #define BTRFS_LABEL_SIZE 256 +#define BTRFS_SUBVOL_LABEL_SIZE 32 /* * just in case we somehow lose the roots and are not able to mount, @@ -702,7 +703,8 @@ struct btrfs_root_item { struct btrfs_timespec otime; struct btrfs_timespec stime; struct btrfs_timespec rtime; - __le64 reserved[8]; /* for future */ + char label[BTRFS_SUBVOL_LABEL_SIZE]; + __le64 reserved[4]; /* for future */ } __attribute__ ((__packed__)); /* diff --git a/ioctl.h b/ioctl.h index 6fda3a1..009fa6e 100644 --- a/ioctl.h +++ b/ioctl.h @@ -432,4 +432,6 @@ struct btrfs_ioctl_clone_range_args { struct btrfs_ioctl_qgroup_create_args) #define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \ struct btrfs_ioctl_qgroup_limit_args) +#define BTRFS_IOC_SUBVOL_GETLABEL _IOWR(BTRFS_IOCTL_MAGIC, 55, __u64) +#define BTRFS_IOC_SUBVOL_SETLABEL _IOW(BTRFS_IOCTL_MAGIC, 56, __u64) #endif diff --git a/print-tree.c b/print-tree.c index 7c615dd..5979109 100644 --- a/print-tree.c +++ b/print-tree.c @@ -330,6 +330,8 @@ static void print_root(struct extent_buffer *leaf, int slot) btrfs_root_stransid(&root_item), btrfs_root_rtransid(&root_item)); } + if (strlen(root_item.label)) + printf("\t\tlabel %s\n", root_item.label); } if (btrfs_root_refs(&root_item) == 0) { struct btrfs_key drop_key;