Btrfs-progs: introduce -g -c --sort options into btrfs subvol list command

This patch introduces '-g' '-c' '--sort' options

The option '-g' can help you filter the subvolumes by the generation, you may
use it just like:

	btrfs subvol list -g +/-value <path>

'+' means the generation of the subvolumes should >= the value you specified.
'-' means the generation should <= the value
If you don't input either '+' nor '-', this command will list the subvolumes
that their generation equals to the value.

However if you want to find gengeration between value1 and value2
you may use the above like:

        btrfs sub list -g -value1 -g +value2 <path>

The option '-c' can help you filter the subvolumes by the ogeneration, you may
use it just like:

	btrfs subvol list -c +/-value <path>

The usage is the same to '-g'

You might want to list subvolumes in order of some items, such as root id, gen
and so on, you can use '--sort'. Now you can sort the subvolumes by root id,
gen, ogen and path.

For example:
If you want to list subvolumes in order of rootid, you can use the option like
that:

	btrfs sub list --sort=+/-rooid <path>

Here, '+' means the result is sorted by ascending order. '-' is by descending
order. If you don't specify either '+' nor '-', the result is sorted by
default - ascending order.

If you want to combine sort items, you do it like that:

	btrfs sub list --sort=-rootid,+path,ogen,gen <path>

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/btrfs-list.h b/btrfs-list.h
index 21d0fdc7..26a5c173 100644
--- a/btrfs-list.h
+++ b/btrfs-list.h
@@ -62,6 +62,14 @@ enum btrfs_list_filter_enum {
 	BTRFS_LIST_FILTER_ROOTID,
 	BTRFS_LIST_FILTER_SNAPSHOT_ONLY,
 	BTRFS_LIST_FILTER_FLAGS,
+	BTRFS_LIST_FILTER_GEN,
+	BTRFS_LIST_FILTER_GEN_EQUAL	=	BTRFS_LIST_FILTER_GEN,
+	BTRFS_LIST_FILTER_GEN_LESS,
+	BTRFS_LIST_FILTER_GEN_MORE,
+	BTRFS_LIST_FILTER_CGEN,
+	BTRFS_LIST_FILTER_CGEN_EQUAL	=	BTRFS_LIST_FILTER_CGEN,
+	BTRFS_LIST_FILTER_CGEN_LESS,
+	BTRFS_LIST_FILTER_CGEN_MORE,
 	BTRFS_LIST_FILTER_MAX,
 };
 
@@ -69,9 +77,15 @@ enum btrfs_list_comp_enum {
 	BTRFS_LIST_COMP_ROOTID,
 	BTRFS_LIST_COMP_OGEN,
 	BTRFS_LIST_COMP_GEN,
+	BTRFS_LIST_COMP_PATH,
 	BTRFS_LIST_COMP_MAX,
 };
 
+int btrfs_list_parse_sort_string(char *optarg,
+				 struct btrfs_list_comparer_set **comps);
+int btrfs_list_parse_filter_string(char *optarg,
+				   struct btrfs_list_filter_set **filters,
+				   enum btrfs_list_filter_enum type);
 void btrfs_list_setup_print_column(enum btrfs_list_column_enum column);
 struct btrfs_list_filter_set *btrfs_list_alloc_filter_set(void);
 void btrfs_list_free_filter_set(struct btrfs_list_filter_set *filter_set);