1 #include <linux/module.h>
5 #include "transaction.h"
7 int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
8 *root, struct btrfs_path *path, struct btrfs_key
9 *cpu_key, u32 data_size)
14 ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
15 overflow = btrfs_key_overflow(cpu_key);
17 while(ret == -EEXIST && overflow < BTRFS_KEY_OVERFLOW_MAX) {
19 btrfs_set_key_overflow(cpu_key, overflow);
20 btrfs_release_path(root, path);
21 ret = btrfs_insert_empty_item(trans, root, path, cpu_key,
27 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
28 *root, const char *name, int name_len, u64 dir, u64
32 struct btrfs_path *path;
33 struct btrfs_dir_item *dir_item;
40 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
41 ret = btrfs_name_hash(name, name_len, &key.offset);
43 path = btrfs_alloc_path();
44 btrfs_init_path(path);
45 data_size = sizeof(*dir_item) + name_len;
46 ret = insert_with_overflow(trans, root, path, &key, data_size);
50 dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
52 struct btrfs_dir_item);
53 btrfs_set_dir_objectid(dir_item, objectid);
54 btrfs_set_dir_type(dir_item, type);
55 btrfs_set_dir_flags(dir_item, 0);
56 btrfs_set_dir_name_len(dir_item, name_len);
57 name_ptr = (char *)(dir_item + 1);
58 btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
59 btrfs_mark_buffer_dirty(path->nodes[0]);
60 btrfs_release_path(root, path);
62 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
63 key.offset = objectid;
64 ret = insert_with_overflow(trans, root, path, &key, data_size);
65 // FIXME clear the dirindex bit
69 dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
71 struct btrfs_dir_item);
72 btrfs_set_dir_objectid(dir_item, objectid);
73 btrfs_set_dir_type(dir_item, type);
74 btrfs_set_dir_flags(dir_item, 0);
75 btrfs_set_dir_name_len(dir_item, name_len);
76 name_ptr = (char *)(dir_item + 1);
77 btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
78 btrfs_mark_buffer_dirty(path->nodes[0]);
80 btrfs_release_path(root, path);
81 btrfs_free_path(path);
85 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
86 *root, struct btrfs_path *path, u64 dir,
87 const char *name, int name_len, int mod)
91 int ins_len = mod < 0 ? -1 : 0;
93 struct btrfs_disk_key *found_key;
94 struct btrfs_leaf *leaf;
99 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
100 btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
101 ret = btrfs_name_hash(name, name_len, &key.offset);
104 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
108 if (path->slots[0] == 0)
112 leaf = btrfs_buffer_leaf(path->nodes[0]);
113 found_key = &leaf->items[path->slots[0]].key;
115 if (btrfs_disk_key_objectid(found_key) != dir ||
116 btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
117 btrfs_disk_key_offset(found_key) != key.offset)
120 if (btrfs_match_dir_item_name(root, path, name, name_len))
123 overflow = btrfs_disk_key_overflow(found_key);
126 btrfs_set_key_overflow(&key, overflow - 1);
127 btrfs_release_path(root, path);
132 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
133 struct btrfs_root *root,
134 struct btrfs_path *path, u64 dir,
135 u64 objectid, int mod)
138 struct btrfs_key key;
139 int ins_len = mod < 0 ? -1 : 0;
141 struct btrfs_disk_key *found_key;
142 struct btrfs_leaf *leaf;
146 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
147 btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
148 key.offset = objectid;
149 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
153 if (path->slots[0] == 0)
157 leaf = btrfs_buffer_leaf(path->nodes[0]);
158 found_key = &leaf->items[path->slots[0]].key;
160 if (btrfs_disk_key_objectid(found_key) != dir ||
161 btrfs_disk_key_type(found_key) != BTRFS_DIR_INDEX_KEY)
163 if (btrfs_disk_key_offset(found_key) == objectid)
168 int btrfs_match_dir_item_name(struct btrfs_root *root,
169 struct btrfs_path *path,
170 const char *name, int name_len)
172 struct btrfs_dir_item *dir_item;
175 dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
177 struct btrfs_dir_item);
178 if (btrfs_dir_name_len(dir_item) != name_len)
180 name_ptr = (char *)(dir_item + 1);
181 if (memcmp(name_ptr, name, name_len))