dir-item.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 "hash.h"
   8
   9 int btrfs_insert_dir_item(struct btrfs_root *root, char *name, int name_len,
  10                           u64 dir, u64 objectid, u8 type)
  11 {
  12         int ret = 0;
  13         struct btrfs_path path;
  14         struct btrfs_dir_item *dir_item;
  15         char *name_ptr;
  16         struct btrfs_key key;
  17         u32 data_size;
  18
  19         key.objectid = dir;
  20         key.flags = 0;
  21         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  22         ret = btrfs_name_hash(name, name_len, &key.offset);
  23         BUG_ON(ret);
  24         btrfs_init_path(&path);
  25         data_size = sizeof(*dir_item) + name_len;
  26         ret = btrfs_insert_empty_item(root, &path, &key, data_size);
  27         if (ret)
  28                 goto out;
  29
  30         dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
  31                                   struct btrfs_dir_item);
  32         btrfs_set_dir_objectid(dir_item, objectid);
  33         btrfs_set_dir_type(dir_item, type);
  34         btrfs_set_dir_flags(dir_item, 0);
  35         name_ptr = (char *)(dir_item + 1);
  36         memcpy(name_ptr, name, name_len);
  37 out:
  38         btrfs_release_path(root, &path);
  39         return ret;
  40 }
  41
  42 int btrfs_lookup_dir_item(struct btrfs_root *root, struct btrfs_path *path,
  43                           u64 dir, char *name, int name_len, int mod)
  44 {
  45         int ret;
  46         struct btrfs_key key;
  47         int ins_len = mod < 0 ? -1 : 0;
  48         int cow = mod != 0;
  49
  50         key.objectid = dir;
  51         key.flags = 0;
  52         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  53         ret = btrfs_name_hash(name, name_len, &key.offset);
  54         BUG_ON(ret);
  55         ret = btrfs_search_slot(root, &key, path, ins_len, cow);
  56         return ret;
  57 }
  58
  59 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
  60                               char *name, int name_len)
  61 {
  62         struct btrfs_item *item;
  63         struct btrfs_dir_item *dir_item;
  64         char *name_ptr;
  65         u32 item_len;
  66         item = path->nodes[0]->leaf.items + path->slots[0];
  67         item_len = btrfs_item_size(item);
  68         if (item_len != name_len + sizeof(struct btrfs_dir_item)) {
  69                 return 0;
  70         }
  71         dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
  72                                   struct btrfs_dir_item);
  73         name_ptr = (char *)(dir_item + 1);
  74         if (memcmp(name_ptr, name, name_len)) {
  75                 return 0;
  76         }
  77         return 1;
  78 }