Btrfs-progs: make printing subvol extensible to newer layouts

Currently you can print subvol in a list or table format.
This patch will provide a way to extend this to other formats
like the upcoming raw format.

Signed-off-by: Anand Jain <anand.jain@oracle.com>

diff --git a/btrfs-list.c b/btrfs-list.c
index a166c8b..1ca7bc4 100644 (file)
--- a/btrfs-list.c
+++ b/btrfs-list.c
@@ -54,12 +54,12 @@ struct {
        {
                .name           = "ID",
                .column_name    = "ID",
-               .need_print     = 1,
+               .need_print     = 0,
        },
        {
                .name           = "gen",
                .column_name    = "Gen",
-               .need_print     = 1,
+               .need_print     = 0,
        },
        {
                .name           = "cgen",
@@ -74,7 +74,7 @@ struct {
        {
                .name           = "top level",
                .column_name    = "Top Level",
-               .need_print     = 1,
+               .need_print     = 0,
        },
        {
                .name           = "otime",
@@ -94,7 +94,7 @@ struct {
        {
                .name           = "path",
                .column_name    = "Path",
-               .need_print     = 1,
+               .need_print     = 0,
        },
        {
                .name           = NULL,
@@ -1415,21 +1415,25 @@ static void print_all_volume_info_tab_head()
 }
 
 static void print_all_volume_info(struct root_lookup *sorted_tree,
-                                 int is_tab_result)
+                                 int layout)
 {
        struct rb_node *n;
        struct root_info *entry;
 
-       if (is_tab_result)
+       if (layout == BTRFS_LIST_LAYOUT_TABLE)
                print_all_volume_info_tab_head();
 
        n = rb_first(&sorted_tree->root);
        while (n) {
                entry = rb_entry(n, struct root_info, sort_node);
-               if (is_tab_result)
-                       print_single_volume_info_table(entry);
-               else
+               switch (layout) {
+               case BTRFS_LIST_LAYOUT_DEFAULT:
                        print_single_volume_info_default(entry);
+                       break;
+               case BTRFS_LIST_LAYOUT_TABLE:
+                       print_single_volume_info_table(entry);
+                       break;
+               }
                n = rb_next(n);
        }
 }
@@ -1455,7 +1459,7 @@ int btrfs_list_subvols(int fd, struct root_lookup *root_lookup)
 
 int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set,
                       struct btrfs_list_comparer_set *comp_set,
-                      int is_tab_result, int full_path)
+                      int layout, int full_path)
 {
        struct root_lookup root_lookup;
        struct root_lookup root_sort;
@@ -1468,7 +1472,7 @@ int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set,
        __filter_and_sort_subvol(&root_lookup, &root_sort, filter_set,
                                 comp_set, top_id);
 
-       print_all_volume_info(&root_sort, is_tab_result);
+       print_all_volume_info(&root_sort, layout);
        __free_all_subvolumn(&root_lookup);
 
        return 0;

diff --git a/btrfs-list.h b/btrfs-list.h
index 2870c71..e626858 100644 (file)
--- a/btrfs-list.h
+++ b/btrfs-list.h
@@ -18,6 +18,9 @@
 
 #include "kerncompat.h"
 
+#define BTRFS_LIST_LAYOUT_DEFAULT      0
+#define BTRFS_LIST_LAYOUT_TABLE        1
+
 /*
  * one of these for each root we find.
  */

diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index d46064a..596bd62 100644 (file)
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -422,8 +422,19 @@ static int cmd_subvol_list(int argc, char **argv)
                                        BTRFS_LIST_FILTER_TOPID_EQUAL,
                                        top_id);
 
-       ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
-                               is_tab_result,
+       /* by default we shall print the following columns*/
+       btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID);
+       btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
+       btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL);
+       btrfs_list_setup_print_column(BTRFS_LIST_PATH);
+
+       if (is_tab_result)
+               ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
+                               BTRFS_LIST_LAYOUT_TABLE,
+                               !is_list_all && !is_only_in_path);
+       else
+               ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
+                               BTRFS_LIST_LAYOUT_DEFAULT,
                                !is_list_all && !is_only_in_path);
        if (ret)
                return 19;
@@ -630,7 +641,14 @@ static int cmd_subvol_get_default(int argc, char **argv)
        btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_ROOTID,
                                default_id);
 
-       ret = btrfs_list_subvols_print(fd, filter_set, NULL, 0, 1);
+       /* by default we shall print the following columns*/
+       btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID);
+       btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
+       btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL);
+       btrfs_list_setup_print_column(BTRFS_LIST_PATH);
+
+       ret = btrfs_list_subvols_print(fd, filter_set, NULL,
+               BTRFS_LIST_LAYOUT_DEFAULT, 1);
        if (ret)
                return 19;
        return 0;