Btrfs-progs: list all qgroups impact given path(exclude ancestral qgroups)

This patch introduces '-f' option which can help you filter the qgroups
by the path name, you may use it like:

	btrfs qgroup show -f <path>
For example:

                         qgroupid(2/0)
                          /     \
                         /       \
                        qgroupid(1/0)
                        /         \
                       /           \
                      /             \
                  qgroupid(0/1)   qgroupid(0/2)
                  sub1              sub2
                  /  \
                 /    \
		dir1  file1

If we use the command:
	btrfs qgroup show -f sub1/dir1
The result will output
	0/1	--	--

'-f' option helps you list all qgroups impact given path.
(exclude ancestral qgroups)

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 15 insertions, 5 deletions

diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 7c6c917..5f1550a 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -202,7 +202,7 @@ static int cmd_qgroup_destroy(int argc, char **argv)
 }
 
 static const char * const cmd_qgroup_show_usage[] = {
-	"btrfs qgroup show -pcreF <path>",
+	"btrfs qgroup show -pcreFf <path>",
 	"Show subvolume quota groups.",
 	"-p		print parent qgroup id",
 	"-c		print child qgroup id",
@@ -210,6 +210,8 @@ static const char * const cmd_qgroup_show_usage[] = {
 	"-e		print max exclusive size of qgroup",
 	"-F		list all qgroups which impact the given path"
 	"(include ancestral qgroups)",
+	"-f		list all qgroups which impact the given path"
+	"(exclude ancestral qgroups)",
 	NULL
 };
 
@@ -229,7 +231,7 @@ static int cmd_qgroup_show(int argc, char **argv)
 
 	optind = 1;
 	while (1) {
-		c = getopt(argc, argv, "pcreF");
+		c = getopt(argc, argv, "pcreFf");
 		if (c < 0)
 			break;
 		switch (c) {
@@ -252,6 +254,9 @@ static int cmd_qgroup_show(int argc, char **argv)
 		case 'F':
 			filter_flag |= 0x1;
 			break;
+		case 'f':
+			filter_flag |= 0x2;
+			break;
 		default:
 			usage(cmd_qgroup_show_usage);
 		}
@@ -268,9 +273,14 @@ static int cmd_qgroup_show(int argc, char **argv)
 
 	if (filter_flag) {
 		qgroupid = btrfs_get_path_rootid(fd);
-		btrfs_qgroup_setup_filter(&filter_set,
-				BTRFS_QGROUP_FILTER_ALL_PARENT,
-				qgroupid);
+		if (filter_flag & 0x1)
+			btrfs_qgroup_setup_filter(&filter_set,
+					BTRFS_QGROUP_FILTER_ALL_PARENT,
+					qgroupid);
+		if (filter_flag & 0x2)
+			btrfs_qgroup_setup_filter(&filter_set,
+					BTRFS_QGROUP_FILTER_PARENT,
+					qgroupid);
 	}
 	ret = btrfs_show_qgroups(fd, filter_set);
 	e = errno;