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