fs/btrfs/dir-item.c

   1 #include <linux/module.h>
   2 #include "ctree.h"
   3 #include "disk-io.h"
   4 #include "hash.h"
   5 #include "transaction.h"
   6
   7 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
   8                           *root, const char *name, int name_len, u64 dir, u64
   9                           objectid, u8 type)
  10 {
  11         int ret = 0;
  12         struct btrfs_path path;
  13         struct btrfs_dir_item *dir_item;
  14         char *name_ptr;
  15         struct btrfs_key key;
  16         u32 data_size;
  17
  18         key.objectid = dir;
  19         key.flags = 0;
  20         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  21         ret = btrfs_name_hash(name, name_len, &key.offset);
  22         BUG_ON(ret);
  23         btrfs_init_path(&path);
  24         data_size = sizeof(*dir_item) + name_len;
  25         ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size);
  26         if (ret)
  27                 goto out;
  28
  29         dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
  30                                   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         btrfs_set_dir_name_len(dir_item, name_len);
  36         name_ptr = (char *)(dir_item + 1);
  37         btrfs_memcpy(root, path.nodes[0]->b_data, name_ptr, name, name_len);
  38         btrfs_mark_buffer_dirty(path.nodes[0]);
  39 out:
  40         btrfs_release_path(root, &path);
  41         return ret;
  42 }
  43
  44 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
  45                           *root, struct btrfs_path *path, u64 dir,
  46                           const char *name, int name_len, int mod)
  47 {
  48         int ret;
  49         struct btrfs_key key;
  50         int ins_len = mod < 0 ? -1 : 0;
  51         int cow = mod != 0;
  52
  53         key.objectid = dir;
  54         key.flags = 0;
  55         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  56         ret = btrfs_name_hash(name, name_len, &key.offset);
  57         BUG_ON(ret);
  58         ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
  59         return ret;
  60 }
  61
  62 int btrfs_match_dir_item_name(struct btrfs_root *root,
  63                               struct btrfs_path *path,
  64                               const char *name, int name_len)
  65 {
  66         struct btrfs_dir_item *dir_item;
  67         char *name_ptr;
  68
  69         dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
  70                                   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 }