root-tree.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "kerncompat.h"
   4 #include "radix-tree.h"
   5 #include "ctree.h"
   6 #include "disk-io.h"
   7 #include "print-tree.h"
   8
   9 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
  10                         struct btrfs_root_item *item, struct btrfs_key *key)
  11 {
  12         struct btrfs_path path;
  13         struct btrfs_key search_key;
  14         struct btrfs_leaf *l;
  15         int ret;
  16         int slot;
  17
  18         search_key.objectid = objectid;
  19         search_key.flags = (u32)-1;
  20         search_key.offset = (u32)-1;
  21
  22         btrfs_init_path(&path);
  23         ret = btrfs_search_slot(root, &search_key, &path, 0, 0);
  24         if (ret < 0)
  25                 goto out;
  26         BUG_ON(ret == 0);
  27         l = &path.nodes[0]->leaf;
  28         BUG_ON(path.slots[0] == 0);
  29         slot = path.slots[0] - 1;
  30         if (btrfs_key_objectid(&l->items[slot].key) != objectid) {
  31                 ret = 1;
  32                 goto out;
  33         }
  34         memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
  35                 sizeof(*item));
  36         btrfs_disk_key_to_cpu(key, &l->items[slot].key);
  37         btrfs_release_path(root, &path);
  38         ret = 0;
  39 out:
  40         return ret;
  41 }
  42
  43 int btrfs_update_root(struct btrfs_root *root, struct btrfs_key *key,
  44                       struct btrfs_root_item *item)
  45 {
  46         struct btrfs_path path;
  47         struct btrfs_leaf *l;
  48         int ret;
  49         int slot;
  50
  51         btrfs_init_path(&path);
  52         ret = btrfs_search_slot(root, key, &path, 0, 1);
  53         if (ret < 0)
  54                 goto out;
  55         BUG_ON(ret != 0);
  56         l = &path.nodes[0]->leaf;
  57         slot = path.slots[0];
  58         memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
  59                 sizeof(*item));
  60 out:
  61         btrfs_release_path(root, &path);
  62         return ret;
  63 }
  64
  65 int btrfs_insert_root(struct btrfs_root *root, struct btrfs_key *key,
  66                       struct btrfs_root_item *item)
  67 {
  68         int ret;
  69         ret = btrfs_insert_item(root, key, item, sizeof(*item));
  70         BUG_ON(ret);
  71         return ret;
  72 }
  73
  74 int btrfs_del_root(struct btrfs_root *root, struct btrfs_key *key)
  75 {
  76         struct btrfs_path path;
  77         int ret;
  78
  79         btrfs_init_path(&path);
  80         ret = btrfs_search_slot(root, key, &path, -1, 1);
  81         if (ret < 0)
  82                 goto out;
  83         BUG_ON(ret != 0);
  84         ret = btrfs_del_item(root, &path);
  85 out:
  86         btrfs_release_path(root, &path);
  87         return ret;
  88 }