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[2/4] Btrfs-progs: disable qgroup level 0 for userspace use

Message ID 1361800972-1978-1-git-send-email-wangshilong1991@gmail.com (mailing list archive)
State Under Review, archived
Headers show

Commit Message

Wang Shilong Feb. 25, 2013, 2:02 p.m. UTC 
From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

To implement a strict hierarchy quota, qgroup level 0
should not be allowed to create/destroy by users.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
---
 cmds-qgroup.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
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Patch

diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 26f0ab0..06505fa 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -86,6 +86,11 @@  static int qgroup_create(int create, int argc, char **argv)
 	memset(&args, 0, sizeof(args));
 	args.create = create;
 	args.qgroupid = parse_qgroupid(argv[1]);
+	if (!(args.qgroupid >> 48)) {
+		fprintf(stderr, "ERROR: unable to create/destroy qgroup "
+				"level 0\n");
+		return 30;
+	}
 
 	fd = open_file_or_dir(path);
 	if (fd < 0) {