#include "hash.h"
#include "transaction.h"
-int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, struct btrfs_key
- *cpu_key, u32 data_size)
+struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *cpu_key,
+ u32 data_size)
{
- int overflow;
int ret;
+ char *ptr;
+ struct btrfs_item *item;
+ struct btrfs_leaf *leaf;
ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
- overflow = btrfs_key_overflow(cpu_key);
-
- while(ret == -EEXIST && overflow < BTRFS_KEY_OVERFLOW_MAX) {
- overflow++;
- btrfs_set_key_overflow(cpu_key, overflow);
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, cpu_key,
- data_size);
+ if (ret == -EEXIST) {
+ ret = btrfs_extend_item(trans, root, path, data_size);
+ WARN_ON(ret > 0);
+ if (ret)
+ return ERR_PTR(ret);
}
- return ret;
+ WARN_ON(ret > 0);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ item = leaf->items + path->slots[0];
+ ptr = btrfs_item_ptr(leaf, path->slots[0], char);
+ BUG_ON(data_size > btrfs_item_size(item));
+ ptr += btrfs_item_size(item) - data_size;
+ return (struct btrfs_dir_item *)ptr;
}
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, const char *name, int name_len, u64 dir, u64
- objectid, u8 type)
+ *root, const char *name, int name_len, u64 dir,
+ struct btrfs_key *location, u8 type)
{
int ret = 0;
struct btrfs_path *path;
path = btrfs_alloc_path();
btrfs_init_path(path);
data_size = sizeof(*dir_item) + name_len;
- ret = insert_with_overflow(trans, root, path, &key, data_size);
- if (ret)
+ dir_item = insert_with_overflow(trans, root, path, &key, data_size);
+ if (IS_ERR(dir_item)) {
+ ret = PTR_ERR(dir_item);
goto out;
+ }
- dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_dir_item);
- btrfs_set_dir_objectid(dir_item, objectid);
+ btrfs_cpu_key_to_disk(&dir_item->location, location);
btrfs_set_dir_type(dir_item, type);
btrfs_set_dir_flags(dir_item, 0);
btrfs_set_dir_name_len(dir_item, name_len);
name_ptr = (char *)(dir_item + 1);
+
btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
+
+ /* FIXME, use some real flag for selecting the extra index */
+ if (root == root->fs_info->tree_root) {
+ ret = 0;
+ goto out;
+ }
+
btrfs_release_path(root, path);
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
- key.offset = objectid;
- ret = insert_with_overflow(trans, root, path, &key, data_size);
- // FIXME clear the dirindex bit
- if (ret)
+ key.offset = location->objectid;
+ dir_item = insert_with_overflow(trans, root, path, &key, data_size);
+ if (IS_ERR(dir_item)) {
+ ret = PTR_ERR(dir_item);
goto out;
-
- dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_dir_item);
- btrfs_set_dir_objectid(dir_item, objectid);
+ }
+ btrfs_cpu_key_to_disk(&dir_item->location, location);
btrfs_set_dir_type(dir_item, type);
btrfs_set_dir_flags(dir_item, 0);
btrfs_set_dir_name_len(dir_item, name_len);
btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
- btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
}
-int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, u64 dir,
- const char *name, int name_len, int mod)
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod)
{
int ret;
struct btrfs_key key;
key.objectid = dir;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
- btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
ret = btrfs_name_hash(name, name_len, &key.offset);
BUG_ON(ret);
- while(1) {
- ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
- if (ret < 0)
- return ret;
- if (ret > 0) {
- if (path->slots[0] == 0)
- return 1;
- path->slots[0]--;
- }
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- found_key = &leaf->items[path->slots[0]].key;
-
- if (btrfs_disk_key_objectid(found_key) != dir ||
- btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
- btrfs_disk_key_offset(found_key) != key.offset)
- return 1;
-
- if (btrfs_match_dir_item_name(root, path, name, name_len))
- return 0;
-
- if (btrfs_disk_key_overflow(found_key) == 0)
- return 1;
- btrfs_release_path(root, path);
+ ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ return NULL;
+ path->slots[0]--;
}
- return 1;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ found_key = &leaf->items[path->slots[0]].key;
+
+ if (btrfs_disk_key_objectid(found_key) != dir ||
+ btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
+ btrfs_disk_key_offset(found_key) != key.offset)
+ return NULL;
+
+ return btrfs_match_dir_item_name(root, path, name, name_len);
}
-int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, u64 dir,
- u64 objectid, int mod)
+struct btrfs_dir_item *
+btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ u64 objectid, const char *name, int name_len,
+ int mod)
{
int ret;
struct btrfs_key key;
int ins_len = mod < 0 ? -1 : 0;
int cow = mod != 0;
- struct btrfs_disk_key *found_key;
- struct btrfs_leaf *leaf;
key.objectid = dir;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
- btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
key.offset = objectid;
+
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
if (ret < 0)
- return ret;
- if (ret > 0) {
- if (path->slots[0] == 0)
- return 1;
- path->slots[0]--;
- }
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- found_key = &leaf->items[path->slots[0]].key;
-
- if (btrfs_disk_key_objectid(found_key) != dir ||
- btrfs_disk_key_type(found_key) != BTRFS_DIR_INDEX_KEY)
- return 1;
- if (btrfs_disk_key_offset(found_key) == objectid)
- return 0;
- return 1;
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return ERR_PTR(-ENOENT);
+ return btrfs_match_dir_item_name(root, path, name, name_len);
}
-int btrfs_match_dir_item_name(struct btrfs_root *root,
+struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
struct btrfs_path *path,
const char *name, int name_len)
{
struct btrfs_dir_item *dir_item;
char *name_ptr;
+ u32 total_len;
+ u32 cur = 0;
+ u32 this_len;
+ struct btrfs_leaf *leaf;
- dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_dir_item);
- if (btrfs_dir_name_len(dir_item) != name_len)
- return 0;
- name_ptr = (char *)(dir_item + 1);
- if (memcmp(name_ptr, name, name_len))
- return 0;
- return 1;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
+ total_len = btrfs_item_size(leaf->items + path->slots[0]);
+ while(cur < total_len) {
+ this_len = sizeof(*dir_item) + btrfs_dir_name_len(dir_item);
+ name_ptr = (char *)(dir_item + 1);
+
+ if (btrfs_dir_name_len(dir_item) == name_len &&
+ memcmp(name_ptr, name, name_len) == 0)
+ return dir_item;
+
+ cur += this_len;
+ dir_item = (struct btrfs_dir_item *)((char *)dir_item +
+ this_len);
+ }
+ return NULL;
+}
+
+int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_dir_item *di)
+{
+
+ struct btrfs_leaf *leaf;
+ u32 sub_item_len;
+ u32 item_len;
+ int ret;
+
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ sub_item_len = sizeof(*di) + btrfs_dir_name_len(di);
+ item_len = btrfs_item_size(leaf->items + path->slots[0]);
+ if (sub_item_len == btrfs_item_size(leaf->items + path->slots[0])) {
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ } else {
+ char *ptr = (char *)di;
+ char *start = btrfs_item_ptr(leaf, path->slots[0], char);
+ btrfs_memmove(root, leaf, ptr, ptr + sub_item_len,
+ item_len - (ptr + sub_item_len - start));
+ ret = btrfs_truncate_item(trans, root, path,
+ item_len - sub_item_len);
+ BUG_ON(ret);
+ }
+ return 0;
}
+
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