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From: Alexander Karbstein <alexander.karbstein@gmail.com>
To: linux-btrfs@vger.kernel.org
Cc: Alexander Karbstein <alexander.karbstein@gmail.com>
Subject: [PATCH V2] Btrfs-progs: Enabled setting root subvolume with subvolid=0
Date: Tue, 31 Jul 2012 19:11:21 +0200	[thread overview]
Message-ID: <1343754681-4454-2-git-send-email-alexander.karbstein@gmail.com> (raw)
In-Reply-To: <50173463.5060405@cn.fujitsu.com>

The command btrfs subvolume set-default 0 /path/to/fs changed the
default subvolume to whatever subvolume was currently mounted on
/path/to/fs. This patch changes this behaviour to set the default
subvolume to BTRFS_FS_TREE_OBJECTID in case the user asks for
subvolid=0

Signed-off-by: Alexander Karbstein <alexander.karbstein@gmail.com>
---
 cmds-subvolume.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 3508ce6..8f8c918 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -25,6 +25,7 @@
 #include <limits.h>
 
 #include "kerncompat.h"
+#include "ctree.h"
 #include "ioctl.h"
 
 #include "commands.h"
@@ -464,6 +465,9 @@ static int cmd_subvol_set_default(int argc, char **argv)
 		fprintf(stderr, "ERROR: invalid tree id (%s)\n",subvolid);
 		return 30;
 	}
+	/* Using the original root fs tree */
+	if (objectid == 0ULL)
+		objectid = BTRFS_FS_TREE_OBJECTID;
 	ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
 	e = errno;
 	close(fd);
-- 
1.7.2.5


      parent reply	other threads:[~2012-07-31 17:20 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-30  7:56 subvolumes: default and IDs Florian Lindner
2012-07-30 11:29 ` Calvin Walton
2012-07-30 12:43   ` Swâmi Petaramesh
2012-07-30 12:18 ` Liu Bo
2012-07-31  0:28 ` Alexander Karbstein
2012-07-31  0:50 ` Alexander Karbstein
2012-07-31  0:53   ` [PATCH] Btrfs-progs: Enabled setting root subvolume with subvolid=0 Alexander Karbstein
2012-07-31  1:26     ` Liu Bo
2012-07-31  2:09       ` Alexander Karbstein
2012-07-31 17:11       ` [PATCH V2] " Alexander Karbstein
2012-07-31 17:11       ` Alexander Karbstein [this message]

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