btrfs-debug-tree: add -d option to print only the device mapping

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/debug-tree.c b/debug-tree.c
index 40628e0..0525354 100644 (file)
--- a/debug-tree.c
+++ b/debug-tree.c
@@ -116,6 +116,7 @@ int main(int ac, char **av)
        int ret;
        int slot;
        int extent_only = 0;
+       int device_only = 0;
        u64 block_only = 0;
        struct btrfs_root *tree_root_scan;
 
@@ -123,13 +124,16 @@ int main(int ac, char **av)
 
        while(1) {
                int c;
-               c = getopt(ac, av, "eb:");
+               c = getopt(ac, av, "deb:");
                if (c < 0)
                        break;
                switch(c) {
                        case 'e':
                                extent_only = 1;
                                break;
+                       case 'd':
+                               device_only = 1;
+                               break;
                        case 'b':
                                block_only = atoll(optarg);
                                break;
@@ -202,7 +206,7 @@ again:
                if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
                        unsigned long offset;
                        struct extent_buffer *buf;
-                       int skip = extent_only;
+                       int skip = extent_only | device_only;
 
                        offset = btrfs_item_ptr_offset(leaf, slot);
                        read_extent_buffer(leaf, &ri, offset, sizeof(ri));
@@ -215,8 +219,9 @@ again:
                                        printf("root");
                                break;
                        case BTRFS_EXTENT_TREE_OBJECTID:
-                               skip = 0;
-                               if (!extent_only)
+                               if (!device_only)
+                                       skip = 0;
+                               if (!extent_only && !device_only)
                                        printf("extent");
                                break;
                        case BTRFS_CHUNK_TREE_OBJECTID:
@@ -225,9 +230,8 @@ again:
                                }
                                break;
                        case BTRFS_DEV_TREE_OBJECTID:
-                               if (!skip) {
-                                       printf("device");
-                               }
+                               skip = 0;
+                               printf("device");
                                break;
                        case BTRFS_FS_TREE_OBJECTID:
                                if (!skip) {
@@ -235,9 +239,8 @@ again:
                                }
                                break;
                        case BTRFS_ROOT_TREE_DIR_OBJECTID:
-                               if (!skip) {
-                                       printf("directory");
-                               }
+                               skip = 0;
+                               printf("directory");
                                break;
                        case BTRFS_CSUM_TREE_OBJECTID:
                                if (!skip) {
@@ -283,13 +286,13 @@ again:
                                        printf("file");
                                }
                        }
-                       if (!skip && !extent_only) {
+                       if (extent_only && !skip) {
+                               print_extents(tree_root_scan, buf);
+                       } else if (!skip) {
                                printf(" tree ");
                                btrfs_print_key(&disk_key);
                                printf(" \n");
                                btrfs_print_tree(tree_root_scan, buf, 1);
-                       } else if (extent_only && !skip) {
-                               print_extents(tree_root_scan, buf);
                        }
                }
                path.slots[0]++;
@@ -302,7 +305,7 @@ again:
                goto again;
        }
 
-       if (extent_only)
+       if (extent_only || device_only)
                return 0;
 
        printf("total bytes %llu\n",