Changeset c0964cd7 in mainline for uspace/lib/ext4/libext4_directory_index.c

Timestamp:

2012-02-29T17:56:12Z (12 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6f731f0a

Parents:

e2ec667e

Message:

code for splitting index block if tree is not trivial (one block)

File:

• uspace/lib/ext4/libext4_directory_index.c (modified) (3 diffs)

uspace/lib/ext4/libext4_directory_index.c

@@ -476 +476 @@
 }
 
+static void ext4_directory_dx_insert_entry(
+                ext4_directory_dx_block_t *index_block, uint32_t hash, uint32_t iblock)
+{
+        ext4_directory_dx_entry_t *old_index_entry = index_block->position;
+        ext4_directory_dx_entry_t *new_index_entry = old_index_entry + 1;
+
+        ext4_directory_dx_countlimit_t *countlimit =
+                        (ext4_directory_dx_countlimit_t *)index_block->entries;
+        uint32_t count = ext4_directory_dx_countlimit_get_count(countlimit);
+
+        ext4_directory_dx_entry_t *start_index = index_block->entries;
+        size_t bytes = (void *)(start_index + count) - (void *)(new_index_entry);
+
+        memmove(new_index_entry + 1, new_index_entry, bytes);
+
+        ext4_directory_dx_entry_set_block(new_index_entry, iblock);
+        ext4_directory_dx_entry_set_hash(new_index_entry, hash);
+
+        ext4_directory_dx_countlimit_set_count(countlimit, count + 1);
+
+        index_block->block->dirty = true;
+}
+
 static int ext4_directory_dx_split_data(ext4_filesystem_t *fs,
                 ext4_inode_ref_t *inode_ref, ext4_hash_info_t *hinfo,
@@ -620 +643 @@
         free(entry_buffer);
 
-        ext4_directory_dx_entry_t *old_index_entry = index_block->position;
-        ext4_directory_dx_entry_t *new_index_entry = old_index_entry + 1;
-
-        ext4_directory_dx_countlimit_t *countlimit =
-                        (ext4_directory_dx_countlimit_t *)index_block->entries;
-        uint32_t count = ext4_directory_dx_countlimit_get_count(countlimit);
-
-        ext4_directory_dx_entry_t *start_index = index_block->entries;
-        size_t bytes = (void *)(start_index + count) - (void *)(new_index_entry);
-
-        memmove(new_index_entry + 1, new_index_entry, bytes);
-
-        ext4_directory_dx_entry_set_block(new_index_entry, new_iblock);
-        ext4_directory_dx_entry_set_hash(new_index_entry, new_hash + continued);
-
-        ext4_directory_dx_countlimit_set_count(countlimit, count + 1);
-
-        index_block->block->dirty = true;
+        ext4_directory_dx_insert_entry(index_block, new_hash + continued, new_iblock);
 
         *new_data_block = new_data_block_tmp;
@@ -759 +765 @@
         uint16_t leaf_count = ext4_directory_dx_countlimit_get_count((ext4_directory_dx_countlimit_t *)entries);
 
-//      ext4_directory_dx_entry_t *root_entries = ((ext4_directory_dx_node_t *) dx_blocks[0].block->data)->entries;
+        ext4_directory_dx_entry_t *root_entries = ((ext4_directory_dx_node_t *) dx_blocks[0].block->data)->entries;
 
         if (leaf_limit == leaf_count) {
                 EXT4FS_DBG("need to split index block !!!");
 
-//              unsigned int levels = dx_block - dx_blocks;
-//
-//              uint16_t root_limit = ext4_directory_dx_countlimit_get_limit((ext4_directory_dx_countlimit_t *)root_entries);
-//              uint16_t root_count = ext4_directory_dx_countlimit_get_count((ext4_directory_dx_countlimit_t *)root_entries);
-//
-//              if ((levels > 0) && (root_limit == root_count)) {
-//                      EXT4FS_DBG("Directory index is full");
-//
-//                      // ENOSPC - cleanup !!!
-//                      return ENOSPC;
-//              }
-//
-//              uint32_t fblock;
-//              rc =  ext4_directory_append_block(fs, parent, &fblock);
-//              if (rc != EOK) {
-//                      // TODO error
-//              }
-//
-//              // New block allocated
-//              block_t * new_block;
-//              rc = block_get(&new_block, fs->device, fblock, BLOCK_FLAGS_NOREAD);
-//              if (rc != EOK) {
-//                      // TODO error
-//              }
-//
-//              memset(new_block->data, 0, block_size);
-//
-//              if (levels > 0) {
-//                      EXT4FS_DBG("split index");
-//              } else {
-//                      EXT4FS_DBG("create second level");
-//              }
+                unsigned int levels = dx_block - dx_blocks;
+
+                uint16_t root_limit = ext4_directory_dx_countlimit_get_limit((ext4_directory_dx_countlimit_t *)root_entries);
+                uint16_t root_count = ext4_directory_dx_countlimit_get_count((ext4_directory_dx_countlimit_t *)root_entries);
+
+                if ((levels > 0) && (root_limit == root_count)) {
+                        EXT4FS_DBG("Directory index is full");
+
+                        // ENOSPC - cleanup !!!
+                        return ENOSPC;
+                }
+
+                uint32_t new_fblock;
+                uint32_t new_iblock;
+                rc =  ext4_directory_append_block(fs, parent, &new_fblock, &new_iblock);
+                if (rc != EOK) {
+                        // TODO error
+                }
+
+                // New block allocated
+                block_t * new_block;
+                rc = block_get(&new_block, fs->device, new_fblock, BLOCK_FLAGS_NOREAD);
+                if (rc != EOK) {
+                        // TODO error
+                }
+
+                // Initialize block
+                memset(new_block->data, 0, block_size);
+
+                if (levels > 0) {
+                        EXT4FS_DBG("split index");
+                        uint32_t count_left = leaf_count / 2;
+                        uint32_t count_right = leaf_count - count_left;
+                        uint32_t hash_right = ext4_directory_dx_entry_get_hash(entries);
+
+                        ext4_directory_dx_node_t *new_node = new_block->data;
+                        ext4_directory_dx_entry_t *new_entries = new_node->entries;
+
+                        memcpy((void *) new_entries, (void *) (entries + count_left),
+                                        count_right * sizeof(ext4_directory_dx_entry_t));
+
+                        ext4_directory_dx_countlimit_t *left_countlimit = (ext4_directory_dx_countlimit_t *)entries;
+                        ext4_directory_dx_countlimit_t *right_countlimit = (ext4_directory_dx_countlimit_t *)new_entries;
+
+                        ext4_directory_dx_countlimit_set_count(left_countlimit, count_left);
+                        ext4_directory_dx_countlimit_set_count(right_countlimit, count_right);
+
+                uint32_t entry_space = block_size - sizeof(ext4_fake_directory_entry_t);
+                uint32_t node_limit = entry_space / sizeof(ext4_directory_dx_entry_t);
+
+                ext4_directory_dx_countlimit_set_limit(right_countlimit, node_limit);
+
+                // Which index block is target for new entry
+                uint32_t position_index = (dx_block->position - dx_block->entries);
+                if (position_index >= count_left) {
+                        dx_block->position = new_entries + position_index - count_left;
+                        dx_block->entries = new_entries;
+                        entries = dx_block->entries;
+
+                        dx_block->block->dirty = true;
+                        block_put(dx_block->block);
+                        dx_block->block = new_block;
+                }
+
+                ext4_directory_dx_insert_entry(dx_blocks, hash_right, new_iblock);
+
+
+                } else {
+                        EXT4FS_DBG("create second level");
+                }
         }