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         path = btrfs_alloc_path();
  24         btrfs_init_path(path);
  25         data_size = sizeof(*dir_item) + name_len;
  26         ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
  27         if (ret)
  28                 goto out;
  29
  30         dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
  31                                   path->slots[0],
  32                                   struct btrfs_dir_item);
  33         btrfs_set_dir_objectid(dir_item, objectid);
  34         btrfs_set_dir_type(dir_item, type);
  35         btrfs_set_dir_flags(dir_item, 0);
  36         btrfs_set_dir_name_len(dir_item, name_len);
  37         name_ptr = (char *)(dir_item + 1);
  38         btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
  39         btrfs_mark_buffer_dirty(path->nodes[0]);
  40         btrfs_release_path(root, path);
  41
  42         btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
  43         key.offset = objectid;
  44         ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
  45         // FIXME clear the dirindex bit
  46         if (ret)
  47                 goto out;
  48
  49         dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
  50                                   path->slots[0],
  51                                   struct btrfs_dir_item);
  52         btrfs_set_dir_objectid(dir_item, objectid);
  53         btrfs_set_dir_type(dir_item, type);
  54         btrfs_set_dir_flags(dir_item, 0);
  55         btrfs_set_dir_name_len(dir_item, name_len);
  56         name_ptr = (char *)(dir_item + 1);
  57         btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
  58         btrfs_mark_buffer_dirty(path->nodes[0]);
  59 out:
  60         btrfs_release_path(root, path);
  61         btrfs_free_path(path);
  62         return ret;
  63 }
  64
  65 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
  66                           *root, struct btrfs_path *path, u64 dir,
  67                           const char *name, int name_len, int mod)
  68 {
  69         int ret;
  70         struct btrfs_key key;
  71         int ins_len = mod < 0 ? -1 : 0;
  72         int cow = mod != 0;
  73
  74         key.objectid = dir;
  75         key.flags = 0;
  76         btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
  77         ret = btrfs_name_hash(name, name_len, &key.offset);
  78         BUG_ON(ret);
  79         ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
  80         return ret;
  81 }
  82
  83 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
  84                                 struct btrfs_root *root,
  85                                 struct btrfs_path *path, u64 dir,
  86                                 u64 objectid, int mod)
  87 {
  88         int ret;
  89         struct btrfs_key key;
  90         int ins_len = mod < 0 ? -1 : 0;
  91         int cow = mod != 0;
  92
  93         key.objectid = dir;
  94         key.flags = 0;
  95         btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
  96         key.offset = objectid;
  97         ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
  98         return ret;
  99 }
 100
 101 int btrfs_match_dir_item_name(struct btrfs_root *root,
 102                               struct btrfs_path *path,
 103                               const char *name, int name_len)
 104 {
 105         struct btrfs_dir_item *dir_item;
 106         char *name_ptr;
 107
 108         dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
 109                                   path->slots[0],
 110                                   struct btrfs_dir_item);
 111         if (btrfs_dir_name_len(dir_item) != name_len)
 112                 return 0;
 113         name_ptr = (char *)(dir_item + 1);
 114         if (memcmp(name_ptr, name, name_len))
 115                 return 0;
 116         return 1;
 117 }