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 #include "transaction.h"
   9
  10 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
  11                           *root, char *name, int name_len, u64 dir, u64
  12                           objectid, u8 type)
  13 {
  14         int ret = 0;
  15         struct btrfs_path path;
  16         struct btrfs_dir_item *dir_item;
  17         char *name_ptr;
  18         struct btrfs_key key;
  19         u32 data_size;
  20
  21         key.objectid = dir;
  22         key.flags = 0;
  23         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  24         if (name_len == 1 && *name == '.')
  25                 key.offset = 1;
  26         else if (name_len == 2 && name[0] == '.' && name[1] == '.')
  27                 key.offset = 2;
  28         else
  29                 ret = btrfs_name_hash(name, name_len, &key.offset);
  30         BUG_ON(ret);
  31         btrfs_init_path(&path);
  32         data_size = sizeof(*dir_item) + name_len;
  33         ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size);
  34         if (ret)
  35                 goto out;
  36
  37         dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
  38                                   struct btrfs_dir_item);
  39         btrfs_set_dir_objectid(dir_item, objectid);
  40         btrfs_set_dir_type(dir_item, type);
  41         btrfs_set_dir_flags(dir_item, 0);
  42         btrfs_set_dir_name_len(dir_item, name_len);
  43         name_ptr = (char *)(dir_item + 1);
  44         memcpy(name_ptr, name, name_len);
  45 out:
  46         btrfs_release_path(root, &path);
  47         return ret;
  48 }
  49
  50 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
  51                           *root, struct btrfs_path *path, u64 dir, char *name,
  52                           int name_len, int mod)
  53 {
  54         int ret;
  55         struct btrfs_key key;
  56         int ins_len = mod < 0 ? -1 : 0;
  57         int cow = mod != 0;
  58
  59         key.objectid = dir;
  60         key.flags = 0;
  61         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  62         ret = btrfs_name_hash(name, name_len, &key.offset);
  63         BUG_ON(ret);
  64         ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
  65         return ret;
  66 }
  67
  68 int btrfs_match_dir_item_name(struct btrfs_root *root,
  69                               struct btrfs_path *path, char
  70                               *name, int name_len)
  71 {
  72         struct btrfs_dir_item *dir_item;
  73         char *name_ptr;
  74
  75         dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
  76                                   struct btrfs_dir_item);
  77         if (btrfs_dir_name_len(dir_item) != name_len)
  78                 return 0;
  79         name_ptr = (char *)(dir_item + 1);
  80         if (memcmp(name_ptr, name, name_len))
  81                 return 0;
  82         return 1;
  83 }