Btrfs: Add support for multiple devices per filesystem

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

1 files changed, 48 insertions, 0 deletions

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index da0b4dcf3617..9c1335dad40c 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -20,6 +20,40 @@
 #include "disk-io.h"
 #include "print-tree.h"
 
+static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
+{
+        int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
+        int i;
+        printk("\t\tchunk owner %llu type %llu num_stripes %d\n",
+               (unsigned long long)btrfs_chunk_owner(eb, chunk),
+               (unsigned long long)btrfs_chunk_type(eb, chunk),
+               num_stripes);
+        for (i = 0 ; i < num_stripes ; i++) {
+                printk("\t\t\tstripe %d devid %llu offset %llu\n", i,
+                      (unsigned long long)btrfs_stripe_devid_nr(eb, chunk, i),
+                      (unsigned long long)btrfs_stripe_offset_nr(eb, chunk, i));
+        }
+}
+static void print_dev_item(struct extent_buffer *eb,
+                           struct btrfs_dev_item *dev_item)
+{
+        char *name;
+        int name_len;
+
+        name_len = btrfs_device_name_len(eb, dev_item);
+        name = kmalloc(name_len, GFP_NOFS);
+        if (name) {
+                read_extent_buffer(eb, name,
+                                   (unsigned long)btrfs_device_name(dev_item),
+                                   name_len);
+        }
+        printk("\t\tdev item name %.*s devid %llu "
+               "total_bytes %llu bytes used %Lu\n", name_len, name,
+               (unsigned long long)btrfs_device_id(eb, dev_item),
+               (unsigned long long)btrfs_device_total_bytes(eb, dev_item),
+               (unsigned long long)btrfs_device_bytes_used(eb, dev_item));
+        kfree(name);
+}
 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 {
         int i;
@@ -34,6 +68,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
         struct btrfs_key key;
         struct btrfs_key found_key;
         struct btrfs_extent_ref *ref;
+        struct btrfs_dev_extent *dev_extent;
         u32 type;
 
         printk("leaf %llu total ptrs %d free space %d\n",
@@ -106,6 +141,19 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
                         printk("\t\tblock group used %llu\n",
                                (unsigned long long)btrfs_disk_block_group_used(l, bi));
                         break;
+                case BTRFS_CHUNK_ITEM_KEY:
+                        print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk));
+                        break;
+                case BTRFS_DEV_ITEM_KEY:
+                        print_dev_item(l, btrfs_item_ptr(l, i,
+                                        struct btrfs_dev_item));
+                        break;
+                case BTRFS_DEV_EXTENT_KEY:
+                        dev_extent = btrfs_item_ptr(l, i,
+                                                    struct btrfs_dev_extent);
+                        printk("\t\tdev extent owner %llu length %llu\n",
+                               (unsigned long long)btrfs_dev_extent_owner(l, dev_extent),
+                               (unsigned long long)btrfs_dev_extent_length(l, dev_extent));
                 };
         }
 }