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From: Jeff Liu <jeff.liu@oracle.com>
To: linux-btrfs@vger.kernel.org
Cc: anand.jain@oracle.com, miaox@cn.fujitsu.com
Subject: [RESEND PATCH V4 1/2] Btrfs: Add a new ioctl to get the label of a mounted filesystem
Date: Wed, 12 Dec 2012 11:22:49 +0800	[thread overview]
Message-ID: <50C7F889.5040103@oracle.com> (raw)
In-Reply-To: <50C7CE36.3060603@oracle.com>

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>

---
 fs/btrfs/ioctl.c |   14 ++++++++++++++
 fs/btrfs/ioctl.h |    2 ++
 2 files changed, 16 insertions(+)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8fcf9a5..b0a5e17 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3699,6 +3699,18 @@ out:
 	return ret;
 }
 
+static int btrfs_ioctl_get_fslabel(struct btrfs_root *root, void __user *arg)
+{
+	const char *label = root->fs_info->super_copy->label;
+	int ret;
+
+	mutex_lock(&root->fs_info->volume_mutex);
+	ret = copy_to_user(arg, label, strlen(label));
+	mutex_unlock(&root->fs_info->volume_mutex);
+
+	return ret ? -EFAULT : 0;
+}
+
 long btrfs_ioctl(struct file *file, unsigned int
 		cmd, unsigned long arg)
 {
@@ -3797,6 +3809,8 @@ long btrfs_ioctl(struct file *file, unsigned int
 		return btrfs_ioctl_qgroup_create(root, argp);
 	case BTRFS_IOC_QGROUP_LIMIT:
 		return btrfs_ioctl_qgroup_limit(root, argp);
+	case BTRFS_IOC_GET_FSLABEL:
+		return btrfs_ioctl_get_fslabel(root, argp);
 	}
 
 	return -ENOTTY;
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 731e287..98f896f 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -453,4 +453,6 @@ struct btrfs_ioctl_send_args {
 			       struct btrfs_ioctl_qgroup_limit_args)
 #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
 				      struct btrfs_ioctl_get_dev_stats)
+#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 53, \
+				   char[BTRFS_LABEL_SIZE])
 #endif
-- 
1.7.9.5


  parent reply	other threads:[~2012-12-12  3:23 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-12  0:22 [RFC PATCH V4 0/2] Btrfs: get/set mounted filesystem label support Jeff Liu
2012-12-12  0:22 ` [PATCH V4 1/2] Btrfs: Add a new ioctl to get the label of a mounted filesystem Jeff Liu
2012-12-12  0:22 ` [PATCH V4 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
2012-12-12  3:03   ` Miao Xie
2012-12-12  3:17     ` Jeff Liu
2012-12-12  0:30 ` [PATCH v4 1/3] Btrfs-progs: get " Jeff Liu
2012-12-12  0:30 ` [PATCH v4 2/3] Btrfs-progs: change " Jeff Liu
2012-12-12  0:30 ` [PATCH v4 3/3] Btrfs-progs: fix cmd_label_usage to reflect this change Jeff Liu
2012-12-12  3:22 ` Jeff Liu [this message]
2012-12-12  3:50   ` [RESEND PATCH V4 1/2] Btrfs: Add a new ioctl to get the label of a mounted filesystem Miao Xie
2012-12-12  4:01     ` Jeff Liu
2012-12-12  3:23 ` [RESEND PATCH V4 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
2012-12-12  4:15   ` Miao Xie
2012-12-17  7:27     ` Jeff Liu

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