Btrfs-progs: list all qgroups impact given path(include 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	--	--
	1/0	--	--
	2/0	--	--

'-F' option help you list all qgroups impact given path.
(include 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, 26 insertions, 2 deletions

diff --git a/qgroup.h b/qgroup.h
index e7a65bae..bcc2b4b4 100644
--- a/qgroup.h
+++ b/qgroup.h
@@ -22,6 +22,21 @@
 #include "ioctl.h"
 #include "kerncompat.h"
 
+struct btrfs_qgroup;
+
+typedef int (*btrfs_qgroup_filter_func)(struct btrfs_qgroup *, u64);
+
+struct btrfs_qgroup_filter {
+	btrfs_qgroup_filter_func filter_func;
+	u64 data;
+};
+
+struct btrfs_qgroup_filter_set {
+	int total;
+	int nfilters;
+	struct btrfs_qgroup_filter filters[0];
+};
+
 enum btrfs_qgroup_column_enum {
 	BTRFS_QGROUP_QGROUPID,
 	BTRFS_QGROUP_RFER,
@@ -33,9 +48,18 @@ enum btrfs_qgroup_column_enum {
 	BTRFS_QGROUP_ALL,
 };
 
-int  btrfs_show_qgroups(int fd);
-void btrfs_qgroup_setup_print_column(enum btrfs_qgroup_column_enum column);
+enum btrfs_qgroup_filter_enum {
+	BTRFS_QGROUP_FILTER_ALL_PARENT,
+	BTRFS_QGROUP_FILTER_MAX,
+};
 
+u64 btrfs_get_path_rootid(int fd);
+int btrfs_show_qgroups(int fd, struct btrfs_qgroup_filter_set *);
+void btrfs_qgroup_setup_print_column(enum btrfs_qgroup_column_enum column);
+struct btrfs_qgroup_filter_set *btrfs_qgroup_alloc_filter_set(void);
+void btrfs_qgroup_free_filter_set(struct btrfs_qgroup_filter_set *filter_set);
+int btrfs_qgroup_setup_filter(struct btrfs_qgroup_filter_set **filter_set,
+			      enum btrfs_qgroup_filter_enum, u64 data);
 u64 parse_qgroupid(char *p);
 int qgroup_inherit_size(struct btrfs_qgroup_inherit *p);
 int qgroup_inherit_add_group(struct btrfs_qgroup_inherit **inherit, char *arg);